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1
Martin, Matthew Daniel. "Managed pressure drilling techniques and tools." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3884.
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The economics of drilling offshore wells is important as we drill more wells
in deeper water. Drilling-related problems, including stuck pipe, lost circulation,
and excessive mud cost, show the need for better drilling technology. If we can
solve these problems, the economics of drilling the wells will improve, thus
enabling the industry to drill wells that were previously uneconomical. Managed
pressure drilling (MPD) is a new technology that enables a driller to more
precisely control annular pressures in the wellbore to prevent these drillingrelated
problems. This paper traces the history of MPD, showing how different
techniques can reduce drilling problems.
MPD improves the economics of drilling wells by reducing drilling
problems. Further economic studies are necessary to determine exactly how
much cost savings MPD can provide in certain situation. Furter research is also
necessary on the various MPD techniques to increase their effectiveness.
2
El-Wahab, Abo B. I. A. "The influence of tool geometry on the performance of drilling tools." Thesis, Aston University, 1985. http://publications.aston.ac.uk/11869/.
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The main objective of the work presented in this thesis is to investigate the two sides of the flute, the face and the heel of a twist drill. The flute face was designed to yield straight diametral lips which could be extended to eliminate the chisel edge, and consequently a single cutting edge will be obtained. Since drill rigidity and space for chip conveyance have to be a compromise a theoretical expression is deduced which enables optimum chip disposal capacity to be described in terms of drill parameters. This expression is used to describe the flute heel side. Another main objective is to study the effect on drill performance of changing the conventional drill flute. Drills were manufactured according to the new flute design. Tests were run in order to compare the performance of a conventional flute drill and non conventional design put forward. The results showed that 50% reduction in thrust force and approximately 18% reduction in torque were attained for the new design. The flank wear was measured at the outer corner and found to be less for the new design drill than for the conventional one in the majority of cases. Hole quality, roundness, size and roughness were also considered as a further aspect of drill performance. Improvement in hole quality is shown to arise under certain cutting conditions. Accordingly it might be possible to use a hole which is produced in one pass of the new drill which previously would have required a drilled and reamed hole. A subsidiary objective is to design the form milling cutter that should be employed for milling the foregoing special flute from drill blank allowing for the interference effect. A mathematical analysis in conjunction with computing technique and computers is used. To control the grinding parameter, a prototype drill grinder was designed and built upon the framework of an existing cincinnati cutter grinder. The design and build of the new grinder is based on a computer aided drill point geometry analysis. In addition to the conical grinding concept, the new grinder is also used to produce spherical point utilizing a computer aided drill point geometry analysis.
3
Vijayan, Kiran. "Vibration and shock amplification of drilling tools." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/283896.
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Malave, Carmen. "Deep hole drilling - Cutting forces and balance of tools." Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-20696.
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Drilling is a standard process for producing holes in metal materials. With an increased hole depth the demands increase on both machine and tool. Deep hole drilling is a complex process which ischaracterized by a high metal removal rate and hole accuracy. A hole deeper than ten times the diameter can be considered a deep hole which requires a specialized drilling technique. During adeep hole drilling process, the forces generated on the deep hole drill give a rise to a resultant radial force. The resultant radial force pushes the drill in a radial direction during a drilling operation. The radial force direction is of crucial importance in regard of tool guidance, stability and hole size accuracy. This force affects tool performance, reduces tool life and has an impact on the bore surface. Due to the complex nature of deep hole drilling, Sandvik Coromant wishes to get a better understanding of how their current deep hole drilling tools are balanced. The purpose of this study is to conduct a survey of a number of drills of Sandvik Coromant deep hole drill assortment. The main aim of this study is to calculate and measure the resultant radial force generated during a deep hole drilling operation. The forces are calculated with the aid of a calculation program and test-runs on a number of drills. This report presents the calculated magnitude and direction of the resultant radial force duringentrance, full intersection and at the exit of the workpiece. In addition to the measured values of theresultant radial force during entry and full intersection. Four different drill geometries are evaluated which of two are competitor drills. A deep hole drill geometry is re-modified in aspect to drill stability based on the outcome of the measured and calculated results. The results acquired from the performed calculation and measurements of the resultant showed that the resultant radial force acts in an angular direction that was outside the range between the support pads. This true for three of the four evaluated drill geometries. There were minor differences between the measured and calculated forces which enforce the reliability of the used calculation program. The modified drill geometry of a deep hole drill gave an indication of which geometry variables have impact on the resultant radial force magnitude and angular direction. The data presented in this report can be a base for future development of a deep hole drill toolgeometry in regard to the resultant radial force. Variables affecting the calculated results and theresultant radial force are presented and discussed. The study is concluded with suggestions of futurework based on the acquired data.
5
Mostert, Pierre Frans. "Computer numerical controlled drilling machine interfaced to a computer aided design package." Thesis, [S.l. : s.n.], 1996. http://dk.cput.ac.za/cgi/viewcontent.cgi?article=1058&context=td_ptech.
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6
Baker, David Alexander. "A technique for controlled compliant drilling of bone applied to the stapedotomy procedure." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266989.
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Fernandes, Marta. "Intelligent automated drilling and reaming of carbon composites." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060608.100839/index.html.
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8
Rahim, Ryan. "Rapid deployment of oil-drilling tools utilizing distribution network and inventory strategies." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61185.
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Thesis (M. Eng. in Logistics)--Massachusetts Institute of Technology, Engineering Systems Division, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 73-76).
DTS is an oil and gas services company that delivers drilling tools to six major customer districts in the continental U.S. After the tools are used at a rig, they are transported to the closest repair and maintenance (MTC) facility in either Colorado (CO) or Oklahoma (OK) where they are disassembled and reconditioned for use on a future job. The tools are modular and require custom assembly and programming, depending on the requirements of the well. On occasion, DTS receives urgent orders for drilling tools to replace failed tools or to cater to unexpected demand. These urgent orders are expected to be delivered to customer sites in less than 24 hours from when an order is received. DTS wants to analyze the supply chain impact of consolidating MTC activities to a single facility for operational efficiencies. The rationalization of MTC activities to the CO facility affects DTS's ability to deliver tools within 24 hours due to the longer transportation times to customer districts. How can this longer transportation time be mitigated? Our research shows that using the OK facility as a postponement and distribution hub allows DTS to continue servicing expedited orders within 24 hours and results in a 28% logistics cost savings over a direct shipment method. The postponement strategy entails staging reconditioned inventory at both the OK and CO facility where they can be configured for use within 4 hours of receiving an order. By simulating the movement of inventory around the closed inventory loop, we determined that the total number of tools in the network and the MTC capacity are two important levers of control that affect the availability of reconditioned inventory to service demand. We found that we were able to fulfill a target item fill rate by calculating capital inventory required using an "order up to" inventory policy and setting facility capacity at one standard deviation above average demand.
by Ryan Rahim.
M.Eng.in Logistics
9
Guo, Jianying, and 郭建英. "Verification of HKU-DPM results by pollout tests and drillhole logs inweathered tuff." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B26663983.
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Aggarwal, Shubhesh, and Kjzal Kaldi. "Agile Project Management for Knowledge-Based Projects in Manufacturing Industry : Case Study: Epiroc Drilling Tools, Fagersta, Sweden." Thesis, Uppsala universitet, Industriell teknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355239.
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Epiroc Drilling Tools is a manufacturing company that produces tools for rock mining and excavation. The company adopted the principles and framework of Lean Product Development in their R&D department with few practices of an agile framework called Scrum. These agile practices are used in the pre-study phase or the knowledge value stream of their lean product development. Hence, this research is limited to the knowledge value stream within the R&D department. The use of agile project management in manufacturing industry is unique and majority of the agile frameworks are specifically designed to suit the needs of software development companies. Several theories like Scrum, Lean, Kanban and DSDM were studied by the researchers to scrutinize the current framework of the department. The challenges and the similarities of the currently used framework with several other agile frameworks and the companies are discussed. Several qualitative research methods were adopted to know the viewpoints of the working employees in the department which are compared with other companies like Volvo Cars, ABB, LShift, EnergySoftware and from another division of Epiroc called Rocktec Automation who faced some similar challenges while practicing agile project management. After further research on the theories and comparison of the process, roles of the working employees and documentations within the knowledge value stream, DSDM had more similarities with the currently used framework than Scrum. This allowed to recommend ways that can fill the missing gaps using practices of DSDM without altering the existing working procedure in the knowledge value stream. This ensures that the improvement in the knowledge value stream remains continuous. On the contrary, a brief discussion is included on whether there is a need to be agile for manufacturing industries or is it just a changing trend in the field of project management.
11
Ugwoha, Ezedimbu. "Performance of uncoated carbide tools in face turning of titanium base, Ti-6246 alloy and when drilling sintered nickel-base, RR1000 alloy." Thesis, London South Bank University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618691.
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Volec, Martin. "Malá vrtná souprava pro vrtání studní." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232188.
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The aim of this thesis is the structural design small drilling rigs for drilling wells. Drilling rig will be used for drilling wells up to 200 mm diameter rotary drilling technology with irrigation water. The first part is a literature search of small drilling rigs. In the second part, then custom design a small drilling rig.
13
Fortunet, Charles. "Zavedení systému kontroly opotřebení při vrtání a řezání závitů do strojních dílů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231706.
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The topic of this thesis is divided in two main parts. The first is about the “tool/workpiece pair” method and the second is related to wear monitoring. The entire project will be about drilling and tapping operations done in SNECMA Vernon. In fact, the part is very expensive so they have to be closely controlled to avoid a maximum scrap pieces. Two software will be used to control it. Firstly, the “tool/workpiece pair” will be done through AMC3 (software developed at the ENSAM). And secondly the wear monitoring will be ensured by the software CTM Visu (developed by ARTIS). My task will be to learn how to use those software and then to implement them in the company.
14
Malý, Martin. "Analýza řezivostnich vlastností řezných nástrojů povlakovaných PVD povlaky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417590.
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In this diploma thesis, literary research about drilling and coating technology focused on PVD coatings was performed. Furthermore, there is an overview of cutting materials. In the experimental part of the work, the attention is dedicated to tests of twist drills from cemented carbide and high-speed steel materials. For these drills, the feed force Ff and the cutting moment Mc were measured when drilling into austenitic stainless steel. At the end of this work, the technical and economic evaluation of the practical part is presented.
15
Santana, Moises Izaias de. "Influência da preparação das arestas de corte de brocas helicoidais no processo de furação." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1419.
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A preparação das arestas de corte é um processo que tem chamado a atenção na indústria de fabricação e recondicionamento de ferramentas em função dos benefícios que tem trazido especialmente na vida útil da ferramenta. Este processo dá um grande diferencial competitivo àqueles que detém o conhecimento de como aplicá-lo e por isso é mantido como um segredo industrial. No que se refere a brocas helicoidais a escassez de informações é ainda maior, em função da alta complexidade da ferramenta e do processo. O presente trabalho traz os resultados da influência da preparação das arestas de corte (alteração da microgeometria) de brocas helicoidais no processo de furação do aço SAE 4144M temperado e revenido com 38 HRC. O processo manual de escovamento foi utilizado para preparar as ferramentas com arestas arredondadas e o processo manual de limagem para as ferramentas com arestas chanfradas. Foram medidas várias características das peças usinadas tais como: diâmetro, circularidade, desvio de posição, rugosidade dos furos obtidos, dureza, microdureza dos corpos-de-prova, força de avanço e torque do processo de furação, avaliação do tipo e forma dos cavacos gerados no processo. Os resultados mostraram que o processo de preparação de arestas aumenta a resistência da ferramenta ao desgaste e consequentemente aumenta sensivelmente sua vida, especialmente as de arestas arredondadas. Além disso, exerce influência na integridade superficial do furo obtido (circularidade e rugosidade) e na microdureza da região próxima à parede do furo obtido. Não houve diferença significativa no torque entre as geometrias analisadas, porém a força de avanço foi menor para a ferramenta apenas afiada sem preparação de aresta.The cutting edge preparation is a process which has drawn attention from the tool’s manufacturing and refurbishing industry due to specialization to its benefits specially to tool useful life. This process results in a major competitive advantage to those who have the knowledge of its application and, for this reason, it is kept as a trade secret. As far as the twist drills are concerned, the scarcity of information is even greater, due to the high complexity of the tool and process itself. This dissertation presents the results of the influence of the preparation of the twist drills cutting edges microgeometry alteration in steel drilling process SAE 4144M quenched and tempered steel with 38 HRC. The manual brushing process was used to prepare tools with rounded edges and manual filing process was used to prepare tools with chamfered edges. Several features from the machined parts were measured, such as diameter, roundness, position deviation, roughness of the obtained holes, hardness and microhardness of specimens, feed force and torque of the drilling process, assessment of type and shape of the chips from the process. The results showed that the edges preparation process increases the wear resistance of the tool and thereby increases its useful life significantly, especially for tools with rounded edges. In addition, it influences the surface integrity of the obtained hole (circularity and roughness) and the hardness of the region near the wall of the obtained hole. There was no significant difference in torque between the analyzed geometries, however the thrust force was lower for the sharpened tool without any edge preparation.
16
Xia, Tian. "INVESTIGATION OF DRILLING PERFORMANCE IN CRYOGENIC DRILLING ON CFRP COMPOSITE LAMINATES." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/36.
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In recent years, there has been a substantial growth in the application of carbon fiber reinforced plastic (CFRP) composite materials in automobile and aerospace industries due to their superior properties such as lightweight, high strength, excellent corrosion resistance, and minimal fatigue concerns. The present study evaluates the drilling performance of woven carbon fiber reinforced plastics under both dry and cryogenic cooling conditions using uncoated solid carbide drill with a through-hole for coolant application.
The effects of the cooling conditions and the cutting parameters on drilling performance in drilling CFRP were evaluated in terms of generated thrust force, torque, cutting edge radius, outer corner flank wear, hole quality (including surface roughness, diameter error, roundness, delamination, burr formation, sub-surface quality). Both cooling conditions and cutting parameters were found to influence the thrust force and torque at different levels. The thrust force and the torque are higher in cryogenic cooling under all cutting parameters. In most of the cases, cryogenic drilling gives better bore-hole quality with lower surface roughness, more accurate diameter, less burr generation, better sub-surface quality, etc. Also, the tool-wear rates measured in drilling shows that cryogenic drilling produces less tool-wear than dry drilling does.
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Cardoso, Marlon José. "Análise do processo de furação profunda no aço SAE 4144M endurecido utilizando MQL e broca helicoidal revestida." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/877.
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Os processos de furação são largamente utilizados na indústria metal mecânica, envolvendo grande complexidade para profundidades maiores que cinco vezes o diâmetro. Para estes casos é necessário o emprego de máquinas, ferramentas especiais e fluidos lubri-refrigerantes pressurizados, com propriedades que atendam as solicitações severas do corte e auxiliem no transporte e remoção dos cavacos durante o processo. Esta complexidade aumenta os custos do processo, o impacto ambiental e os riscos a saúde do operador. O propósito deste estudo é analisar o processo de furação profunda com broca helicoidal de metal-duro revestida, em profundidades de até 24 vezes o diâmetro, no aço SAE 4144M, forjado e temperado com 39 HRC de dureza, utilizando o sistema lubri-refrigerante de Mínima Quantidade de Lubrificante (MQL). O estudo compara os processos com sistemas lubri-refrigerante convencional e sistema MQL, com a análise da influência no desgaste das brocas, revestidas com TiAlN e AlCrN-based. O sistema lubri-refrigerante convencional ou jorro de óleo, utiliza fluido integral de base mineral pressurizado a 50 bar, enquanto o sistema MQL utiliza fluido lubri-refrigerante sintético a 10 bar de pressão. A formulação dos experimentos é dada por “design of experiment” (DOE), considerando as variáveis: velocidade de corte, avanço, temperatura da peça e a forma do cavaco. Constatou-se que o desgaste da broca utilizando MQL, foi menor do que no processo convencional, devido ao fato da temperatura de corte ser maior, porém estável. Com a escolha adequada dos parâmetros de corte através do método, o revestimento AlCrN-based apresentou menor desgaste e adesão, devido a resistência em usinagens com altas temperaturas.The drilling processes are widely used in the metalworking industry and involve high complexity when happen in depths more than five times the diameter. For these cases it is necessary to use special machines and tools, and pressurized fluids to enhance chip removal, with cooling and lubricating properties that meet stringent requirements. This complexity adds costs to the process, Increases the environmental impact and the health risks for the operator. The purpose of this study is to evaluate the deep hole drilling process (up to 24 diameters) using a twist drill coated (carbide system), the material is SAE 4144M steel forged and tempered hardness of 39 HRC, using system Minimum Quantity Lubrication (MQL). The study compares conventional processes and MQL, with the analysis of the influence on the wear of drills coated with TiAlN and AlCrN-based. The conventional coolant uses mineral based oil integral pressurized to 50 bar, while the MQL system, using synthetic oil at 10 bar pressure. The formulation of the experiments is given by “design of experiment” (DOE), considering the variables: cutting speed, feed rate wear, temperature of the work piece and chip form. It was found that the life of the drill in MQL process was higher than that in the conventional process, due to the fact that the temperature of the cut is, more stable, although higher. With the appropriate choice of cutting parameters by the method, the AlCrN-based coating showed less wear and adhesion due to resistant to high temperatures.
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Chander, Karthik Balachandran. "Adaptive tool selection strategies for drilling in flexible manufacturing systems." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/566.
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The thesis presents an approach to adaptive decision making strategies to reduce bottlenecks in a drilling operation and to extend tool life. It is an attempt to portray the real drilling system in a typical Flexible Manufacturing System (FMS) layout. The system designed serves as back end intelligence to drilling machines (INTELLIDRILL) in a Flexible Manufacturing System for making dynamic and real time decisions. INTELLIDRILL uses mathematical and adaptive tool reliability models to simulate the machining conditions and tool availability for an operation based on history of tool failures. The results are used to compute the machining parameters and the tools required for an operation. INTELLIDRILL can devise strategies for different tool materials to operate on batches of different materials. INTELLIDRILL decisions could lead to significant savings in tooling costs and reduction in flow line bottlenecks.
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Viloria, Ochoa Marilyn. "Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4334.
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This study presents a simplified and accurate procedure for selecting the
rheological model which best fits the rheological properties of a given non-
Newtonian fluid and introduces five new approaches to correct for tool joint
losses from expansion and contraction when hydraulics is calculated. The new
approaches are enlargement and contraction (E&C), equivalent diameter (ED),
two different (2IDs), enlargement and contraction plus equivalent diameter
(E&C+ED), and enlargement and contraction plus two different IDs (E&C+2IDs).
In addition to the Newtonian model, seven major non-Newtonian rheological
models (Bingham plastic, Power law, API, Herschel-Bulkley, Unified, Robertson
and Stiff, and Casson) provide alternatives for selecting the model that most
accurately represents the shear-stress/shear-rate relationship for a given non-
Newtonian fluid.
The project assumes that the model which gives the lowest absolute average
percent error (EAAP) between the measured and calculated shear stresses is the
best one for a given non-Newtonian fluid.
The results are of great importance in achieving correct results for pressure drop
and hydraulics calculations and the results are that the API rheological model (RP 13D) provides, in general, the best prediction of rheological behavior for the
mud samples considered (EAAP=1.51), followed by the Herschel-Bulkley,
Robertson and Stiff, and Unified models. Results also show that corrections with
E&C+2IDs and API hydraulics calculation give a good approximation to
measured pump pressure with 9% of difference between measured and
calculated data.
20
Cvrkal, Richard. "Návrh na zefektivnění výroby strojírenského dílu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382248.
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The thesis is dealing with drilling deep holes. Theoretical part of thesis is focused on base knowledge of deep drilling. Experimental part deals with testing two different borers, with different cutting conditions and different purchase prize. Drilling was made into 1.2343 ESU material. Conclusion of this work is concept of purchase machinery for deep drilling.
21
Hansson, Anders. "Detection of tool wear in drilling based on axis position signals." Thesis, Högskolan Väst, Avdelningen för maskinteknik och naturvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-10335.
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Cutting operations are important and commonly used operations in the field of manufacturing. Automated machining is today commonly used in CNC-machines. One common drawback with automated machining is that the tool condition is challenging to predict which leads to a conservative tool replacement times. This leads to a low utilisation of the tool economical lifetime and an unnecessary high number of tool replacements. Methods for indirect continuous monitoring of the tool wear exist but usually require retrofitting of external sensors that can be both costly and also interrupt the machine operation due to the additional wiring. It is therefore of interest to investigate the possibility to use the, often high resolution, sensors already fitted in a CNC-machine to extract valuable data that can indirectly give an estimation of the tool condition. This thesis work has, with attention to the X-, Y- and Z-position sensors, resulted in development of algorithms that show relations between tool wear and data acquired from these sensors. The algorithms operate in the frequency domain to determine changes in the dynamic response over the time of tool degradation.
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Jin, Kenichiro 1979. "Thermal analysis of directional drilling tool in high heat flux environment." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89354.
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Turčín, Jiří. "Návrh technologie výroby zvolené součásti a aplikace navržených změn do výrobního procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318860.
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This master thesis deals with a design of technological process description for a mechanical engineering part called „pressure plate“. The component is analyzed in regards to its mechanical engineering design and used material. Some brief theoretical prerequisites for an effective solution of the problem are summarized in the paper. A detailed research of current technological methods is provided, together with an analysis of the State-of-the-Art in manufacturing, introduction of technological possibilities of the company and a timeline records of the manufacturing process. In regards to the current methods and technologies, changes to the technological process are applied. Among these changes is a unification of machinery used in the process. This leads to an innovation of the methodology and the ways to clamp the component. Other applied alternations focus on a stabilization of the drilling process, which is reached by a choice of new tools and adjustment of cutting parameters. Furthermore, a variable coding of tools in case of automatic tool change is designed. This paper then provides two possible solutions based on proposed changes and alternations. These solutions, together with the tools mentioned, are subjects to a techno-economical assessment.
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Dong, Ho Duong. "Characterization of machine tool components for drilling operations with intergrated damping system." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102575.
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In recent years the control of tool vibration has emerged as the critical area of scientific development. This is because tool vibration creates sound-noise and unwanted quality surface. Mathematically, the observed tool vibration is a ratio of the force acting on the tool to its dynamic stiffness. Because dynamic stiffness is strongly influence by tool damping, the tool vibration could be controlled by enhancing the damping ability of the tooling system. The Department of Production Engineering at KTH has designed new damped drilling tools which absorb the vibratory energy from machining. It is expected that they have better performances than the conventional drilling tools. In this paper, new drilling tools were tested and compared to conventional ones with Experimental Modal Analysis (EMA) and Machining tests. The natural frequencies, the damping ratios, and mode shapes were detected. Also the drilling tools were tested while mounted in the damped clamping device and the conditional clamping device. Taguchi method was then conducted to find the optimal cutting parameters of each combination of the drilling tool and the clamping device. The EMA shows that the damped tools have higher damping ratio than the conventional one. In the machining test, damped tools also achieve better quality surface while mounted in the conventional clamp. The damped clamp helps the conventional tool improve the damping ratio significantly; however it does not give any improvement for the damped tool.
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Wang, Zhijun. "Investigation of a fuzzy approach to condition monitoring of tool wear during drilling." Thesis, Southampton Solent University, 1995. http://ssudl.solent.ac.uk/2418/.
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This study investigated a methodology for an on-line condition monitoring of tool wear during milling. Based on a comprehensive literature survey, a novel method called 'feature filtered fuzzy clustering' is proposed and developed. Different from the existing fuzzy clustering techniques used for the condition monitoring of machine faults and tool awear, this method can make a realistic identification and classification of tool wear under various cutting conditions by the classification of the features on which the effects of cutting conditions were removed. To realise this method, the relationships between the cutting conditions and the features under three pre-defined wear states corresponding to three clustering centres (initial, normal, severe) were established by experiemnts, which were undertaken under the conditions defined by experiemental design, and non-linear multiple regression analysis. During experiments, a sensor fusion strategy was applied in order to get information from different aspects of the milling process. A mathematical model for fuzzy clustering based on the conception of distance has been verified by experiments using inserts both with artificially created flank wear and accelerated natural flank wear during milling in a CNC tool. In order to obtain appropriate features, the effectiveness of applying different physical parameters, i.e. cutting forces, power consumption of the spindle motor, AE RMS and AE pseudo ring-down count, for monitoring of tool wear has been investigated. Employing data fusion approach and its effect on the classification results has been investigated. Also the feasibility of applying Fourier and Walsh transforms to cutting force signals during monitoring of tool wear has been investigated.
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Merino, Perez Julian Luis. "The effect of resin on tool wear in the drilling of CFRP composites." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13479/.
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Tool wear developed in the drilling of carbon fibre reinforced polymer (CFRP) and other FRP composites has been typically attributed in literature to the abrasive nature of the fibres. Unexpectedly, early research conducted by Sandvik Coromant found that the type of resin had an important influence on the tool wear developed in the drilling of CFRP composites with similar carbon fibre fabrics and different resins using coated and uncoated WC-Co tools. This thesis studied the influence of resin on tool wear in the drilling of CFRP composites by investigating the influence of workpiece constituents on a number of aspects relevant to the drilling operation. The resin showed a significant impact on the forces developed in the drilling of CFRP composites. Resins with a high degree of cross-linking developed greater thrust force (Fz) and torque (Mz) than low cross-linked matrices. On the other hand, torque showed to be more sensitive to changes in cutting speed (Vc) in drilling composites with high modulus (HM) CF fabrics than in composites with high strength (HS) CF fabrics. This behaviour was found to be related to the lower temperatures developed in the machining of HM CF-reinforced composites compared to HS CF-reinforced systems. The higher temperatures developed at lower cutting speeds compared to higher cutting speeds increased the ability of the composite to form longer and more twisted chips, thus requiring a higher torque to produce these. Considering the influence of the workpiece constituents on the aspects commented above, tool wear mechanisms in the drilling of CFRP composites were further investigated. No evidence of chemical wear was found, rendering the tool wear process fundamentally mechanical. Two types of mechanical wear regimes occurred; mild wear, involving the removal of the cobalt (binder) and the subsequent removal of carbide grains and severe wear, involving the hard polishing of the carbide phase and high tool material removal rates. Pin-on-disc experiments and further tool wear tests revealed that the abrasiveness of the composite and the tool-workpiece coefficient of friction (μ) are higher at the beginning of drilling than at later stages, i.e. when the workpiece temperature is below Tg. Hence, the influence of resin on tool wear relies on the ability of the resin to hold the reinforcement firmly during the drilling operation. At temperatures above Tg, the resin cannot longer hold the fibres tight against the cutting edge and tool wear-related phenomena decrease (fibre-flank face brushing and fibre spring back).
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Maru, Tejas. "Effects of Minimum Quantity Lubrication (Mql) on Tool Life in Drilling Aisi 1018 Steel." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc149638/.
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It has been reported that minimum quantity lubrication (MQL) provides better tool life compared to flood cooling under some drilling conditions. In this study, I evaluate the performance of uncoated HSS twist drill when machining AISI 1018 steel using a newly developed lubricant designed for MQL (EQO-Kut 718 by QualiChem Inc.). A randomized factorial design was used in the experiment. The results show that a tool life of 1110 holes with a corresponding flank wear of 0.058 mm was realized.
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Hallberg, Daniel, and Patrik Ringdahl. "Study on a high precision drilling tool with focus on power source and driveline." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-218001.
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Alusta, Gamal Abdulla Mohamed. "A decision making tool to assist in choosing between polymer flooding and infill well drilling." Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/2640.
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Oil companies propose polymer flooding techniques, but oftentimes find it difficult to convince asset teams to implement these. This is because it is much easier to estimate the return on investment from an infill well drilling programme, and the return is much quicker. On the other hand, there may be a delay of years before increased oil recovery is observed following implementation of polymer flooding process, and indeed, it may be difficult to ascertain just how much incremental oil has been recovered. The work developed in this thesis involved setting up a range of polymer flooding scenarios, performing analysis using both very detailed reservoir simulation calculations with a range of sensitivities, and also economic calculations, again testing a range of parameters, to ensure that a full range of possible outcomes is evaluated, and then making a comparison with infill drilling to maximise the value of mature assets. The method was first applied to a synthetic scenario with constant economic parameters, and was then applied and tested with varied operational and economic parameters. These sensitivity calculations have been performed by developing a computer program, coded in Java. Monte Carlo Simulation (MCS) is then performed to generate statistics from this method, and test economic uncertainties and the risks associated with implementation of polymer flooding. The method was then applied to a real field system where the choice of infill well drilling had previously been made by the operating company, to test the robustness of the analysis using polymer flooding against a conventional decision making process for which there is historical data. Finally, the approach was then used in an offshore field which has been undergoing waterflooding, but where the choice for further field development has yet to be made, with the operator considering polymer flooding as an alternative (or in addition) to infill well drilling. The thesis discusses the implications of using this newly developed methodology in identifying the risk of failure and in assisting in making an optimal choice based on technical and economic considerations in a fully integrated manner.
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Boud, Fathi M. "An investigation of the relationship between temperature, forces and tool wear in turning and drilling." Thesis, Aston University, 1998. http://publications.aston.ac.uk/15284/.
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Developing a means of predicting tool life has been and continues to be a focus of much research effort. A common experience in attempting to replicate such efforts is an inability to achieve the levels of agreement between theory and practice of the original researcher or to extrapolate the work to different materials or cutting conditions to those originally used. This thesis sets out to examine why most equations or models when replicated do not give good agreements. One reason which was found is that researchers in wear prediction, their predictions are limited because they generally fail to properly identify the nature of wear mechanisms operative in their study. Also they fail to identify or recognise factors having a significant influence on wear such as bar diameter. Also in this research the similarities and differences between the two processes of single point turning and drilling are examined through a series of tests. A literature survey was undertaken in wear and wear prediction. As a result it was found that there was a paucity in information and research in the work of drilling as compared to the turning operation. This was extended to the lack of standards that exist for the drilling operation. One reason for this scarcity in information on drilling is due to the complexity of the drilling and the tool geometry of the drill. In the comparative drilling and turning tests performed in this work, the same tool material; HSS, and similar work material was used in order to eliminate the differences which may occur due to this factor. Results of the tests were evaluated and compared for the two operations and SEM photographs were taken for the chips produced. Specific test results were obtained for the cutting temperatures and forces of the tool. It was found that cutting temperature is influenced by various factors like tool geometry and cutting speed, and the temperature itself influenced the tool wear and wear mechanisms that act on the tool. It was found and proven that bar diameter influences the temperature, a factor not considered previously.
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Kavan, Petr. "Řešení technologie součásti "víko" v podmínkách středně velké strojírenské firmy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229896.
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The diploma thesis is concerned with evaluation of actual production technology of part “hydraulics cover” and with design of new, progressive variation machining of this part. Solution is focused at first on rationalization of cutting tools and choice of suitable cutting tools. An effort is to achieve shorter production time and decrease costs on production of component. With this problem is related alteration of technological documentation and technical economic evaluation for determination return rate of investments into progressive cutting tools.
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Alajbegovic, Vahidin. "Design and development of a test apparatus for a downhole tool metal face mechanical seal." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19588.
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Cheng, Ming-Yi. "An experimental investigation into tool wear in micro-drilling of aluminium, aluminium/copper metal alloys and carbon fibre reinforced composites." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/14613.
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Limitation of conventional machining equipment has become a growing concern over the past two decades due to the demands for greater machining accuracy in today’s manufacturing. The development of micro-machining has therefore attracted significant attention; it signifies the advancement of national economy as well as the level of accuracy manufacturing industry could achieve. While the connection between tool lifespan, cost of machining and throughput is well established, the factor of tool lifespan appears to have more significance since the miniaturization of tool could lead to further performance concerns such as its lack of strength and durability. On the other hand, raising feed rate and spindle rotation speed are the two common approaches for increasing manufacturing throughput. Such approaches tend to cause an increase in the thrust force subjecting the tool to greater stress, which is the main cause of tool wear and even tool failure. Through literature review and preliminary experiments, it was found that spot-drill is often done prior to micro-drilling since it prepares a pre-drill countersunk hole that helps the alignment of tool for subsequent micro-drilling. Although such pre-drill step does improve the micro-drilling operation, the fundamental issue of tool diameter difference still remains. Often the tool used for pre-drill has a bigger diameter than the one for micro-drilling although a significant difference is always something to be avoided. This is because the difference has to be picked up by the tool used for micro-drilling and is directly linked to the wear caused by increased thrust force. In this research the operation of micro-drilling is investigated via mathematical models. Such operation is further broken down into various steps and stages so more detailed description can be achieved. The findings are then further enhanced by simulation based on the 3D model of micro-drilling. Three materials were selected for this research: Al 6061T, Al/Cu metal alloy panel and Carbon fibre reinforced composites. Such a selection enables the study of individual characteristics of different materials and the variation in respective thrust forces. Finally, Conclusions present the summary of the main findings from micro-drilling process analysis based on research and investigation shown in earlier chapters. By combining actual measurements on micro-drilling and mathematic model this research hopefully would improve the understanding towards micro-drilling processes.
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Opršál, Ladislav. "Návrh výroby jednoúčelového stupňovitého obráběcího nástroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241844.
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The aim of this thesis is to propose a single-purpose stepped cutting tool for the drilling of the cylinder head. The thesis first introduces the current production of the cylinder head, including the description of the cutting conditions and the machines and tools used in the production process. The second part of the thesis is focused on the drilling of a three-step hole for which a step drill bit is proposed. The proposal describes the development of the drill bit, heat treatment, the method of clamping, the replaceable cutting tips used in the production process, additions for further machining and the cutting conditions. The last part of the thesis then deals with the technical-economic analysis, comparing the present and innovated stage of the production of the cylinder head.
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Jallageas, Jérémy. "Optimisation du perçage de multi-matériaux sur unité de perçage automatique (UPA)." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00982328.
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L'allégement des structures aéronautiques conduit à associer par stratification les composites aux métaux : on parle alors de multi-matériaux. L'assemblage mécanique des empilages nécessite au préalable des opérations de perçage qui s'effectuent majoritairement sur Unité de Perçage Automatique (UPA). L'objectif des travaux présentés dans ce mémoire est d'optimiser les opérationsde perçage effectuées sur UPA dans des multi-matériaux CFRP-7175-TA6V. Trois axes de recherche ont ainsi été étudiés. Le premier concerne l'optimisation de l'outil. L'utilisation d'une méthode de conception adaptée a conduit vers plusieurs pistes d'améliorations de la géométrie d'un foret. Le deuxième axe traite de la modélisation du perçage vibratoire. Cette méthode consiste à ajouter un mouvement de vibration axiale, au mouvement de coupe. Le dernier axe développe la technique du perçage auto-adaptatif. Une nouvelle méthode est proposée pour identifier les différents matériaux constituants l'empilage.
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Tkáčová, Alena. "Sestavení technologie součásti "cage" ve firmě CCI Brno." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229897.
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This thesis is focused on techology of manufacturing a "cage" component at CCI Brno company. It solves drilling holes to the outside diameter of it. In the first part the company CCI is introduced, and in the second part is focused on component and material analysis. Next step is analyzing present manufacturing procedures and proposing its change. At the end of this thesis is techno-economic comparison of the present and proposed technological change.
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Sedláček, Jan. "Efektivní obrábění vláknově vyztužených kompozitních materiálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233910.
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The objectives for this dissertation are to push forward the current state of knowledge in the area of machining fiber-reinforced plastic (FRP). The most common machining operation performed on these materials is drilling owing to the need for component assembly in mechanical pieces and structures. Among the defects caused by drilling, delamination appears as to be of the most critical and may occur at both the entrance and exit plane. A number of theoretical and experimental studies have been made to create an analytical model of delamination in composite laminates. In this dissertation, the critical thrust force (force which initiates the delamination) is predicted using linear elastic fracture mechanics - assuming Mode I. Delamination is investigated by studying the evolution of feed force and torque applied by the tool on the workpiece. A four components piezoelectric dynamometer KISTLER 9272 with special PC-software is used for measuring and evaluating of torque and cutting forces, when drilling two different composite materials: carbon/epoxy laminate fabricated by hand lay-up technique and glass/polyester composite made by pultrusion. Wear mechanisms and location of the wear on the tool are also investigated (with respect to cutting material). The tool wear is measured with help of a common workshop microscope and recorded with scanning electron microscope PHILIPS XL30. Drilling experiments are performed to give complex technical information (i.e. cutting conditions, tool geometry, tool wear and so on) which enables efficient machining of composite materials. Delamination-free drilling is given special emphasis in the experiments. Methods of statistical analysis (DOE) are used to determine which factors have the most influence on delamination.
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Larsson, Rickard. "Development and application of a tool for assessing the impact of failure modes on performance of underground drill rigs." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-93415.
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Trends such as increasing awareness of sustainable production, shorter product life cycles and personalised products create challenges for the mining industry. A solution to these challenges may be a functional product business model, where the provider sells the hardware’s function under a service contract and is responsible for delivering the combination of hardware and services over the duration of the contract. Under a functional product contract, it is of great importance to predict the availability performance of the hardware. For the mining company to strengthen its competitiveness even further, the reliability and maintainability are also crucial factors to reduce costs, maximise profits, minimise downtime, and improve forecasting of operating hours. The feasibility of performance modelling would be increased if it could be performed by a tool.In prior research related to the reliability of mining vehicles in underground mines, a research gap for drilling rigs was identified. The aim of the thesis was to build a prototype tool and develop a realistic test case to apply it to as a demonstration of how it can help mining vehicle (drilling vehicle) providers understand the impact of their failure modes, particularly from the perspective of providing those vehicles under functional product contracts. The focus was to develop a tool that can be accessible for decision makers within mine operating and mine vehicle provider companies who are not specialists in reliability and maintenance modelling.A simulation model was developed in JaamSim, a graphical user interface developed in Qt designer and the integration between them developed in the Python programming language. A realistic test case was constructed with the purpose of imitating a jumbo drill rig, specifically the Boomer M2 manufactured by Epiroc, used to develop tunnels in an underground mine. Three critical failure modes of the Boomer M2 were identified. Simulations of the test case show that the bent boom arm failure mode had greatest influence on the availability of the drill rig.The developed prototype tool demonstrates the value of decision support tools for measuring the impact of failure modes on functional product contracts and its potential for aiding their negotiation and adoption. The tool has a low complexity regarding usage which should increase its usefulness for decision makers. To increase the tools usefulness further, extending its flexibility of application to other mining vehicles and different maintenance policies has been identified as the next steps for future work.Key words:
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Režný, Tomáš. "Řezné síly při vrtání vláknově vyztužených kompozitů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228620.
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This master´s thesis is focused on fibre–filled composite materials, their distribution, labeling, usage, development and production. The aim of this work is complex processing of acquired technical knowledge, and evaluation of technological rehearsals of drilling composite materials which are reinforced by glas fiber and prepreg in terms of the impact of the machined material, wor-king conditions and the tool, and its wear to the feed force value and torque.
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Merenus, Ondřej. "Multifunkční obráběcí centrum pro rotační i nerotační obrobky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231336.
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This thesis will focus on a design of multifunctional machining center. The work is created in cooperation with two colleagues. Michal Kunorza will design a rotary table and Tomáš Grëtz will design a machine spindle with automatic tool exchange. My part of the work will focus on design of linear tool axis. The result of this cooperation should be machining center for rotary and non-rotary workpieces.
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Berka, Martin. "Vliv geometrie a řezných parametrů nástroje na zbytkové napětí při obrábění tlakových zásobníků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241903.
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This thesis deals with the influence of changes in cutting parameters and tool geometry on residual stress inside the material. I examine the influence by deep drilling. Changing the cutting parameters concerns the alteration of the tool feed and the pressure of the coolant during the process. The influence of tool geometry is studied by using two different single edge cannon drills. The research was realized in cooperation with Bosch Diesel Ltd. The theoretical part includes a description of the injection system, in which a high-pressure container is contained. The high-pressure container was used to evaluate the influence of the cutting parameters and tool geometry on residual stress. Furthermore, the theoretical part deals with the deep drilling technology used and the theory of residual stresses. The practical part shows the measurement parameters and the corresponding results. In the conclusion of this thesis, a technical-economic evaluation of the measurement is conducted.
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Massirer, Junior Ercio. "Usinabilidade de ligas de ferro fundido para aplicação em cabeçotes de motor através de ensaios de furação." Universidade do Estado de Santa Catarina, 2010. http://tede.udesc.br/handle/handle/1766.
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During the last years the Compacted Graphite Iron CGI has acquired a growing placein the automobilist industry. It is used to manufacture several automotive parts, such as disk brakes, exhaust manifolds and, mainly, engine cylinder heads and blocks. Its higher strength, compared to grey cast iron, makes possible the manufacturing of cylinder blocks with higher pressure in the combustion chamber, therefore, more efficient and less pollutant. Lighter engines can be manufactured because of the thinner walls required. On the other hand, the Compacted Graphite Iron brings technological challenges for obtaining cast parts and also to machine them, because they normally reduce the tool lives during machining. This work s objective is to research the machinability of different compositions in order to obtain and alloy that can be used as a feasible alternative for manufacturing cylinder heads. The work consists, fundamentally, in the machinability evaluation of three cast iron alloys, Compacted Graphite Iron classes 450 and 350, and Grey Cast Iron class 300, through drilling tests. The machinability criterion used is the tool wear.
Nos últimos anos o ferro fundido vermicular tem conquistado um crescente espaço na indústria automobilística. Destina-se à fabricação de diversas peças automotivas, tais como discos de freio, coletores de escapamento e, principalmente, cabeçotes e blocos para motores. Sua maior resistência mecânica, em relação ao ferro fundido cinzento, possibilita a fabricação de motores com maiores pressões na câmara de combustão, portanto, mais eficientes e menos poluentes. Motores mais leves podem ser fabricados, em função das menores espessuras de parede necessárias. Por outro lado, o ferro fundido vermicular traz consigo desafios tecnológicos tanto para a obtenção da peça fundida quanto para a usinagem, uma vez que, normalmente, provoca redução da vida das ferramentas de usinagem. O presente trabalho objetiva pesquisar a usinabilidade de diferentes composições a fim de obter uma liga que possa ser utilizada como uma alternativa viável para a fabricação de cabeçotes de motor. O trabalho consiste, fundamentalmente, na avaliação da usinabilidade de três ligas de ferro fundido, sendo o vermicular da classe 450, da classe 350 e o cinzento da classe 300, e para tanto foram utilizados ensaios de furação de longa duração. Como critério de usinabilidade considerado foi utilizado o desgaste da ferramenta.
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Kachyňa, Stanislav. "Návrh výrobní technologie součásti obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229221.
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This thesis deals with design for manufacturing technology single part on machine FS, which is the connecting part. Work deals with the material of this component, therefore, cast iron with lamellar graphite, the properties of this material, primarily focusing on the machinability. Due to the shape and dimensions of the workpiece is also described problems cutting of box parts, the most common operations used in their manufacture, including cutting tools and materials. These findings are then applied in terms of the company TOS Kuřim - OS a.s. An analysis of current manufacturing technology and design is made for its amendment. In conclusion with the technical-economic evaluation.
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Strnad, Jiří. "Návrh malé multifunkční modelářské CNC frézky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444277.
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This diploma thesis deals with the construction proposal of a small multifunctional modeller CNC milling machine that enables milling of aluminium alloys and 3D printing using the FDM method. Based on the research, analyzes and defined entry requirements the construction proposal is created and verified by calculations. The thesis contains a description of all the construction parts including the printhead, the tool tray and the safety cover. The other part of the thesis describes the machine geometry adjustment and specifies the choice of control system. The thesis includes a 3D model and the drawing documentation of selected structural nodes.
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Aytekin, Kasim. "Characterization of machinability in lead-free brass alloys." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240107.
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Ny lagstiftning har lagt fokus på den tociska naturen av bly som legeringselement I mässingsprodukter. Vattenförsörjningssystem är av största oro där misstänkt blyläckage från mässingsprodukter hotar människors hälsa, världen över. Denna studie har utförts i syfte att karaktärisera bearbetbarheten av blyfria mässingslegeringar för att förse industrin med nödvändig information och underlätta att ersätta dagens blyade alternativ. Karaktäriseringen har fokuserat på två specifika bearbetningsprocesser, nämligen svarvning och borrning där intresset har legat hos skärkraftsgenerering och spånbildning. Svarvtesterna riktade sig mot att jämföra tre olika legeringar, CW511L, AquaNordicÒ och CW625N. De två förstnämnda är blyfria och CW625N är en medelblyhaltig mässingslegering. Borrtesterna riktade sig mot att karaktärisera vilken effekt borrgeometrier har på skärkraftsgenerering och spånbildning. Huvudfokus lades på inverkan av spånvinkel och borrdiameter. Borrtesterna utfördes endast på AquaNordicÒ. Resultaten har visat att, signifikant högre skärkrafter genereras vid svarvning av blyfria legeringar jämfört med blyfria. Det fanns emellertid ingen signifikant skillnad mellan de båda blyfria legeringarna avseende skärkrafter, medan spånbildning förbättrades för AquaNordicÒ . Borrtesterna har å andra sidan visat att bearbetningen hos den blyfria AquaNordicÒ -legeringen kan förbättras genom att öka på spånvinkeln och minska borrdiameter. Baserat på resultaten från det här avhandlingsarbetet har man dragit slutsatsen att bearbetningen av blyfria mässingslegeringar är tillräckligt bra för att kunna antas av industrin. Förbättring är dock nödvändig för att ersätta de blyeade alternativen helt.Recent legislation has put focus on the toxic nature of lead as an alloying element in brass products. Watersupply systems are of biggest concern where suspected lead leakages from brass products are threatening human health. A comprehensive study has been conducted in order to characterize the machinability of lead-free brass alloys to provide the industry with necessary information to assist a replacement of the leaded alternatives. The characterization has focused on two particular machining processes, namely turning and drilling and has been based on cutting force generation and chip formation. While the turning tests aimed to characterize the machinability by comparing two lead-free alloys (CW511L and AquaNordic®) with a leaded alloy (CW625N), drilling tests aimed to characterize machinability of the lead-free AquaNordic® alloy particularly, with the main focus put on the impact of tool geometry on machinability. The results have shown that significantly higher cutting forces are generated during turning of lead-free alloys as compared to the leaded. There was, however, no significant difference between the two lead-free alloys regarding cutting forces while chip formation is improved for AquaNordic®. Drilling tests have shown that the machinability of the lead-free AquaNordic® alloy can be improved by increasing the tool rake angle and decreasing tool diameter. Based on the results from this thesis work, it has been concluded that the machinability of lead-free brass alloys is sufficiently good to be able to be adopted by the industry. However, improvement is necessary inorder to fulfill the requirement needed to replace the leaded alternatives.
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Fairhurst, Charles. "Contribution a l'amelioration de l'abattage mecanique de roches agressives : le pic assiste et le pic vibrant." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0111.
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Etude bibliographique, theorique et experimentale (experiences du cerchar et du v. S. Bureau of mines, minneapolis) de deux techniques: abattage assiste au jet d'eau, et abattage par vibration forcee (la premiere seule apparait prometteuse)
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Yu, Ok Y. "Systems Approach and Quantitative Decision Tools for Technology Selection in Environmentally Friendly Drilling." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-515.
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One of the petroleum industry?s goals is to reduce the environmental impact of oil and gas operations in environmentally sensitive areas. To achieve this, a number of Environmentally Friendly Drilling (EFD) technologies have been developed to varying degrees. For example, the use of an elevated platform as an alternative to the gravel pad is less intrusive and leads to a more environmentally friendly approach to drilling operations. Elevated drilling platforms will require the use of piles. Another alternative to the gravel pad is the use of composite mats. Since the demand of low impact technologies for drill site construction has rapidly increased, the parametric study for the feasibility of using pile foundations and composite mats is conducted in this research.
Even though a number of EFD technologies have already been developed to varying degrees, few have been integrated into a field demonstrable drilling system (i.e., combination of technologies) compatible with ecologically sensitive areas. In general, it is difficult to select the best combination of EFD technologies for a given site because there are many possible combinations and many different evaluation criteria. The proposed technology evaluation method is based on a systems analysis that can be used for integrating current and new EFD technologies into an optimal EFD system. An optimization scheme is suggested based on a combination of multi-attribute utility theory and exhaustively enumerating all possible technology combinations to provide a quantitative rationale and suggest the best set of systems according to a set of criteria, with the relative importance of the different criteria defined by the decision-maker. In this research, the sensitivity of the optimal solution to the weight factors and the effects of the uncertainty of input scores are also discussed using a case study.
An application of the proposed approach is described by conducting a case study in Green Lake at McFaddin, TX. The main purpose of this case study is to test the proposed technology evaluation protocol in a real site and then to refine the protocol. This research describes the results of the case study which provided a more logical and comprehensive approach that maximized the economic and environmental goals of both the landowner and the oil company leaseholder.
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Torabi, Seyed J. "Improved version of BTA deep-hole drilling tools with staggered disposable carbide inserts." Thesis, 1990. http://spectrum.library.concordia.ca/3456/1/ML56119.pdf.
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Wang, Kuang-Jen 1962. "Drilling process evaluation by predicting drilled hole quality and drill bit wear with on-line acoustic emission signals." Thesis, 1996. http://hdl.handle.net/1957/34003.
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Improvement of manufacturing productivity is dependent on the successful
automation of manufacturing processes, the success of which is based in turn upon
the availability of information which describes the state of manufacturing operations.
Acoustic Emission (AE) signals related to the cutting process and tool wear have
been recently applied to monitor manufacturing processes, and various AE parameters
can be used to provide process information. For example, when cutting tools
become worn, AE energy generated at the interface of tool flank and work piece
increases. This study is thus an experimental investigation of the AE spectrums representing
AE signals energy distribution to determine the possibility of extracting
useful parameters to provide on-line information about drilled-hole quality and drill-bit
wear.
An experiment conducted using a radial-arm drilling machine was employed
to collect on-line AE drilling process spectrums, yielding eight indicator parameters.
Drill wear states were measured using a machine vision system. Assessment of the
drilled hole quality was based on tolerances established in Geometric Dimensioning and Tolerancing (GD&T). Correlations among drill wear, drilled-hole quality measurements,
and the AE spectrum indicator parameters were examined by regression
analysis. A forward-stepwise variable selection procedure was used to select the
best-fit regression model for each drilled hole quality measurement associated with
the set of one AE parameter raised to different powers. According to quality measurements,
drilled holes were categorized as either "acceptable" or "unacceptable"
holes, using cluster analysis with a group-averaging method. The usage of AE
parameters to decide to which group a drilled hole belonged was also examined.
From the experimental evidence, it was observed that there are strong
relationships between AE parameters and drill-wear state and the quality measurements
of drilled holes. AE parameters could be useful predictor variables to provide
information to controller/operators to evaluate current drilling processes. Based on
the status information of drill wear and the quality measurements, drilling processes
can be adjusted accordingly.Graduation date: 1997
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Chien, Wei Cheng, and 簡偉丞. "Fabrication and evaluation of electroplated Ni-Cr-C-diamond drilling tools prepared from the Cr3+-based electroplating bath." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107CGU05489018%22.&searchmode=basic.
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