Journal articles: 'Drilling tools'

1

Sharma, A., V. Jain, and D. Gupta. "Multi-shaped tool wear study during rotary ultrasonic drilling and conventional drilling for amorphous solid." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, no. 3 (May 14, 2018): 551–60. http://dx.doi.org/10.1177/0954408918776724.

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Float glass, which is a hard and brittle material, is generally machined and drilled using rotary ultrasonic machining and conventional drilling to create products such as solar panels, metrological instruments, etc. But researchers are facing serious issues with regard to tool wear and opting for best shape of tool for the drilling purpose. In this study, blind holes are made on float glass specimen using rotary ultrasonic drilling and CNC conventional drilling process with the aid of multi-shaped tools. The opted tools are namely hollow abrasive tool, pin-pointed conical tool, flat cylindrical tools, and concave circular tool. The entire experimental work is accomplished by considering industrial conditions. Multi-shaped tool’s weight is computed at three stages i.e. (a) fresh tool, (b) after rotary ultrasonic drilling, and (c) after conventional drilling to analyze the overall tool wear. Apparently, micro-studies are used to investigate the phenomena of lateral and end face tool wear while creating blind holes at these three stages. It is revealed that the concave circular tool achieved a minimum percentage of weight loss i.e. 4.92% after conventional drilling and 1.96% after rotary ultrasonic drilling process, which could be preferred for drilling purpose followed by the hollow abrasive tool.

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Gao, Hang, Yuan Zhuang, Ben Wang, and Jun Liang Huang. "Study on the Combined Machining Technology of Sawing and Grinding for Drilling Aramid/Epoxy Composites." Advanced Materials Research 565 (September 2012): 436–41. http://dx.doi.org/10.4028/www.scientific.net/amr.565.436.

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Aiming at the problem of poor machinability in conventional drilling of aramid/epoxy composites, the formation reason for fuzzing damage was analyzed. In order to obtain better machining quality, a combined machining technology based on sawing and grinding mechanism was proposed and the corresponding drilling tools were developed. Drilling experiments were conducted to explain the machining performance of the drilling tools. The results show that the sawing drilling tool with negative rake angle can effectively restrain fuzzing damage and the sawing-grinding drilling tool decreases the thrust force about 20%~55% with electroplated diamond abrasives. The combined machining technology of sawing and grinding achieves damage-free machining quality in drilling of aramid/epoxy composites.

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3

He, Jiang Fu, He Liu, Kun Yin, and Xin Gan. "Field Tests on the Application of Oscillation Tool with a Fluidic Amplifier to Directional Well Drilling." Applied Mechanics and Materials 741 (March 2015): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amm.741.599.

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The directional well drilling technology is extensively utilized and developed throughout the world. However, series of drilling problems occurred in the operation process of directional drilling. In order to reduce the friction of drilling tools, an oscillation tool with a fluidic amplifier has been field tested, and the pressure pulse of oscillation tool has been obtained. Field test results have shown that the oscillation tool has an extensive flexibility to directional well drilling, and the oscillation tool could stably actuate the drilling tool to have reciprocating vibration, which contributes to the friction and drag reduction of drilling tools. Furthermore, it can be concluded that the pressure pulse value generated by pumped fluid varies with input flow rate, and the pressure of oscillation tool increases while the flow rate is increasing. In addition, the motion frequency of the oscillation tool is exponentially increasing with the raise of pumped flow rate.

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4

Peng, Xiaogan, Ting Zeng, Zhongwang Yin, Zeng Zhao, and Liang Li. "Experimental study on drilling basalt with small diameter drilling tools." Advances in Space Research 64, no. 5 (September 2019): 1177–87. http://dx.doi.org/10.1016/j.asr.2019.05.038.

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Gupta, Vishal, Ravinder Pal Singh, Pulak M. Pandey, and Ravi Gupta. "In vitro comparison of conventional surgical and rotary ultrasonic bone drilling techniques." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 234, no. 4 (February 6, 2020): 398–411. http://dx.doi.org/10.1177/0954411919898301.

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In orthopedic and trauma surgical operations, drilling of bone is one of the commonly used procedures performed in hospitals and is a clinical practice for fixing the fractured parts of human bones. Force, torque and temperature play a significant role during the bone drilling and decide the stability of the medical implants. Therefore, it is necessary to minimize force, torque and temperature while drilling to avoid the thermal necrosis and osteosynthesis. This study focused on studying the influence of various types of bone drilling parameters (rotational speed, feed rate, drill diameter and ultrasonic amplitude), tools (solid tool, hollow tool and conventional twist drill bit) and techniques (conventional surgical drilling, rotary ultrasonic bone drilling and rotary bone drilling) on force, torque, temperature and microcracks produced in the drilled surface of the bone. The experimental investigations were conducted on porcine bone samples to perform the comparative study. Results revealed that increasing the diameter of drill tool and feed rate results in the increase in force, torque and temperature, while low rotational speed (500 r/min) generated a low temperature, high cutting force and torque for all types of drilling processes and tools evaluated in this study. Experimental results also revealed that rotary ultrasonic bone drilling with hollow tool generated the lowest cutting force, torque, temperature (<47 °C) and microcracks in the drilled surface of the bone as compared to the other four types of drilling techniques evaluated in this study. Influence of external irrigation technique on temperature was also studied with respect to the rotary ultrasonic bone drilling with a hollow tool, which could eliminate the problem of thermal necrosis. In conclusion, this study revealed that the rotary ultrasonic bone drilling process with hollow tool produced lesser cutting force as compared to rotary bone drilling and conventional surgical drilling for hollow and solid tools. The study also revealed that rotary ultrasonic bone drilling process has the potential to minimize the cutting force, torque and temperature as compared to the conventional surgical drilling for orthopedic surgery.

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Cheng, Chung Chieh, and Dong Yea Sheu. "Small Holes Fabrication on Soda Glass by Self-Elastic Polycrystalline Diamond Tool." Key Engineering Materials 516 (June 2012): 516–21. http://dx.doi.org/10.4028/www.scientific.net/kem.516.516.

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This study describes a novel process to drill small holes in brittle materials such as glass, silicon and ceramic using a self-elastic polycrystalline diamond (PCD) drilling tool. In order to improve the surface roughness and reduce crack of the small holes, a new type of self-elastic PCD drilling tool equipped with vibration absorbing materials inside the housing was developed to fabricate small holes in glass in this study. The self-elastic PCD drilling tools could absorb the mechanical force by the vibration absorbing materials while the PCD tool penetrates into the small holes. Compared to conventional PCD drilling tools, the experimental results show that high-quality small holes drilled in glass can be achieved with cracking as small as 0.02mm on the outlet surface using the self-elastic PCD drilling tool.

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Ashrafi, Sina Alizadeh, Ali Davoudinejad, Mohsen Marani Barzani, and Pouria Salehi. "Investigation into Effect of Tool Wear on Drilling Force and Surface Finish While Dry Drilling Aluminum 2024." Advanced Materials Research 548 (July 2012): 387–92. http://dx.doi.org/10.4028/www.scientific.net/amr.548.387.

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Dry drilling of aluminum is environmentally friendly machining technique; in the meanwhile it is difficult to carry out due to aluminums gummy behavior and its tendency to adhere to cutting tools which diminishes hole quality. In spite of recent developments in cutting tool technology, HSS tools are still a cost effective choice due to relatively high toughness and feasibility to manufacture complex geometries of HSS drills besides its low price, make this tool a common choice for drilling soft materials such as aluminum. In this study effect of tool wear on thrust force and torque analyzed and hole quality assessed with respect to tool wear along tool life. Dry drilling on aluminum 2024, performed using HSS and HSCo drills at constant feed rate of 0.04 mm/rev and two cutting speeds of 28 and 94 m/min. Results revealed that the abrasive wear on flank face and BUE on chisel edge, margin and cutting lips were dominant mechanisms in all drills. It was found that with propagating the wear land on tool, thrust force and torque increased in both tools.

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8

Bogdanov, R. K., A. A. Shulzhenko, A. P. Zakora, A. M. Isonkin, and V. G. Gargin. "New superhard material for drilling tools." Journal of Superhard Materials 29, no. 1 (February 2007): 56–63. http://dx.doi.org/10.3103/s1063457607010078.

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9

Shen, Xue Hong, and Hong Bing Zhao. "The Method of Transforming Ordinary Machine Tools to Ultrasonic Vibration Deep Hole Drilling Machine Tools." Applied Mechanics and Materials 541-542 (March 2014): 538–43. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.538.

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Ultrasonic vibration deep hole drilling is a kind of new technology for combining ultrasonic vibration with deep hole drilling. This paper mainly describes the transformation of lathe, vertical milling machine and vertical machining center by bits vibration direction or adding some auxiliary institutions, then make it have the ability of drilling deep hole. With these transformation, machine tools have some advantages, such as the efficiency and precision are improved, machining quality is stable, chip removal is easy, the cost is low. Besides, it also provides a good way for making full use of existing equipments.

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10

Bakkal, Mustafa, Veli Nakşiler, and Bora Derin. "Machinability of Bulk Metallic Glass Materials on Milling and Drilling." Advanced Materials Research 83-86 (December 2009): 335–41. http://dx.doi.org/10.4028/www.scientific.net/amr.83-86.335.

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In this study, machinability of Zr-based bulk metallic glass (Zr52.5Ti5Cu17.9Ni14.6Al10) (BMG) material was investigated by conducting a set of milling and drilling experiments. In milling, two different tool paths, spiral and slot milling, were used. To investigate the behavior of BMG in drilling by two different tools at different feed rates, two sets of drilling experiments are conducted. Crown shaped exit burr formation are observed in drilling of BMG. Best results on thrust force, exit burr formation and hole surface roughness is obtained while using micrograin WC tool on BMG drilling. No chip light emission was observed during all tests. This study concludes that BMG can be achieved machining with good surface roughness, (Ra=0.113 µm), using conventional cutting tools.

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11

Volz, Marcel, Eberhard Abele, and Matthias Weigold. "Lateral Vibrations in Deep Hole Drilling Due to Land Width Variation." Journal of Manufacturing and Materials Processing 4, no. 2 (March 26, 2020): 28. http://dx.doi.org/10.3390/jmmp4020028.

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In drilling processes, self-excited vibrations have a negative influence on the achievable drilling qualities and tool life. Low-frequency radial vibrations are characterised by oscillating movements of the tool tip and the generation of lobed holes in drilling. This study focuses on the participation and influence of the land widths of twisted drilling tools on these vibrations. Therefore, drilling tools with different land widths and a length-to-diameter ratio of 12 are used, and different parameters, such as feed rate, cutting speed, coolant pressure, pre-hole diameter, and chuck selection, are varied in a drill-out process. The results show that the land widths have a statistically significant influence on the formation of lateral vibrations and the generation of lobed holes.

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12

Martiuchenko, I. G., and M. I. Zenin. "Сomparative analysis of efficiency of use a screw drill on frozen soil." Russian Automobile and Highway Industry Journal 18, no. 2 (May 20, 2021): 160–67. http://dx.doi.org/10.26518/2071-7296-2021-18-2-160-167.

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Introduction. Drilling of frozen and permafrost soils is one of the complex and energy-intensive processes of earthworks. Drilling tools used on frozen soils implement the process of drilling the soil by deformation of cutting or crushing action. Current drilling tools are not efficient enough to use because they implement energy-intensive drilling processes and are not always suitable for various types of soils. A screw drill is considered, which implements the process of soil destruction by shear and shear deformation, which is less energy intensive.Materials and methods. On the basis of theoretical studies of the interaction of 3 types of drilling tools with frozen soil, a comparative analysis was carried out to determine the efficiency of a screw drill use. The technical and economic indicators of the drilling process were compared. A method for determining the efficiency of the use a screw drill based on the analysis of special target functions is presented.Results. The results of a comparative analysis of drilling tools have been obtained. Depending on the nature of soil deformation, the effectiveness of one drilling tool over another is determined. As a result of a comparative analysis of the drilling speed and the energy intensity of the drilling process, the efficiency of the screw drill was established.Discussions and conclusion. In the course of the comparative analysis, the efficiency of the screw drill was determied, which implements shear deformation and soil separation, justifying the feasibility of further research.

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13

Zhang, Hong Zhou, Ying Ying Wei, Yi Chu Yuan, and Hong Yu Jiang. "Research on Hole-Making Tools for CFRP." Advanced Materials Research 797 (September 2013): 592–96. http://dx.doi.org/10.4028/www.scientific.net/amr.797.592.

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There are lots of defects in the drilling process of CFRP, such as splitting, etc, which may affect the assembly quality of the composite materials. Through the analysis of the drilling mechanism of CFRP, and with the help of the correlation experiments of drilling tools, the effects of machining parameters and machining tools on hole quality are studied, the optimal selection method of the drilling tools for CFRP and the selection principle of technical parameters under different machining conditions are also discussed. And the tools geometry affects the hole-machining quality of CFRP materials directly, which should be chosen in accordance with the hole-machining method.

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14

Abdulwahhab, Akram H., Maha R. Hamoudi, and Sasan Hanna. "Drilling Optimization of a Selected Field in Kurdistan Region of Iraq." UKH Journal of Science and Engineering 1, no. 1 (December 23, 2017): 39–52. http://dx.doi.org/10.25079/ukhjse.v1n1y2017.pp39-52.

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Since the startup of petroleum drilling industry, the drilling companies and the drilling tools manufacturers have continuously focused their research to optimize for drilling through better tool production as well as applying techniques and methods those best serve in optimizing drilling for time save, better use of tools, safeguard the well and the formation and eventually provide for a major cost save. This paper is based on analyzing the drilling parameters of bit weight, rotation, rate of penetration as well as drilling hydraulics of three of the wells drilled by an operator in a selected field in Kurdistan. The research will apply optimization technique proposed and implemented by Simmons in 1986 to the drilling bits and parameters of these three wells and suggest drilling parameters in two scenarios for future wells if are to be drilled. The study will present the time save using each scenario and recommend best practice for future drilling.

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15

Toshov, Javoxir, and Murkhriddin Mamatov. "Modern high-performance drilling tools for quarry drilling rigs ball bits." Asian Journal of Multidimensional Research (AJMR) 10, no. 3 (2021): 348–52. http://dx.doi.org/10.5958/2278-4853.2021.00135.x.

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16

Zhang, Jianguo, Yigao Yuan, and Jinjiang Zhang. "Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics." Applied Sciences 8, no. 9 (September 13, 2018): 1642. http://dx.doi.org/10.3390/app8091642.

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The drilling of carbon fiber reinforced plastics (CFRP) is a significant topic for the aircraft industry. However, CFRP are materials which are difficult to cut due to their unique properties. This paper studies tools with excellent cutting performance in machining CFRP. The microcrystalline diamond (MCD), nanocrystalline diamond (NCD), and dual-layer composite MCD/NCD coatings are deposited on Co-cemented tungsten carbide (WC-Co) drills. The morphology of MCD shows pyramidal grains and the NCD and MCD/NCD coatings present cauliflower-like morphology. The cutting performances of coated tools are checked in CFRP drilling tests by the drilling force and tool wear. According to the results, the dual-layer composite MCD/NCD coated tools present the best cutting performance with the lowest drilling force. Meanwhile, the MCD/NCD coated tools display high resistance to wear and adhesive strength.

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17

Xiao, Bing, Hong Jun Xu, Hong Hua Su, Yu Can Fu, and Jiu Hua Xu. "Machining Performance on Multi-Layer Brazed Diamond Tools." Key Engineering Materials 416 (September 2009): 598–602. http://dx.doi.org/10.4028/www.scientific.net/kem.416.598.

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An attempt has been made to investigate the new generational manufacturing technology for multi-layer diamond tools by brazing. A kind of new multi-layer brazed diamond core drills with random grains distribution was made by mixing diamond particles with brazing alloy powders. And a preliminary machining performance experiment was carried out through drilling granite. The testing results show the typical topography of the multi-layer brazed diamond core drills after drilling granite, just like that of multi-layer sintered ones, is that diamond grits drag long tails. Different from multi-layer sintered diamond core drills, no grit pull-outs can be seen during the whole drilling process because of chemical metallurgical effect between diamond grit and brazing alloy, the same as monolayer brazed diamond core drills. The main drawback to this kind of multi-layer brazed diamond tools is each individual particle is not subjected to the same drilling force throughout the drilling operation because of random grain distribution. This leads to premature fracture of the leading particles. Similarly, because large gaps between particles exist, the bond is being exposed to the workpiece, which leads to erosion of the bond. The overall performance is lower tool lives and slower drilling speeds. Therefore, ideally, diamond particles should be evenly distributed throughout the bond, which means they are all subject to the same drilling forces and the multi-layer brazed diamond tool is operated at its optimum efficiency.

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18

Liu, Dong, Hong Hai Xu, Chao Ying Zhang, and Hong Juan Yan. "Drilling Force in High Speed Drilling Carbon Fibre Reinforced Plastics (CFRP) Using Half Core Drill." Advanced Materials Research 102-104 (March 2010): 729–32. http://dx.doi.org/10.4028/www.scientific.net/amr.102-104.729.

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The Composites are difficult machining materials which widely used in aerospace industry due to their excellent mechanical properties. Tool wear and delamination are considered the major concern in manufacture the parts and assembly. The thrust force and torque affect the tool life and delamination mostly. This paper investigated the drilling force and torque of carbon fibred composite with carbide drilling tools and half core drilling tool. The experiments were carried out under air cooling cutting conditions and the drilling force using carbide tool and half core tool were compared and the experimental results indicated that the drilling forces using half core drill were smaller than that of using carbide tool.

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Shi, Run Ping, Cheng Yong Wang, X. M. Bai, and L. M. Gao. "Study on Drilling Tools for Ti/Carbon Fibre Interlaminated Composites." Key Engineering Materials 499 (January 2012): 162–67. http://dx.doi.org/10.4028/www.scientific.net/kem.499.162.

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There are some defects such as delamination and tools chipping etc. in drilling Ti/Carbon fibre interlaminated composites. To look for countermeasures, a special drill is developed considering tool material, geometry, coatings, cutting edge strengthening and drilling technology. The drill is comparable with imported tools as far as holes quality, efficiency and life are concerned. It is highly appreciated by customers.

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Wang, Ren Sheng, Yun Pu Du, Ke Gang Zhu, and Bao Quan Liu. "Structure Design of Closed-Loop Rotary Steerable Drilling Tools." Applied Mechanics and Materials 448-453 (October 2013): 3354–58. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3354.

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Rotating automatic steerable drilling technology is a new automated drilling technology developed in the early 1990s, which is an important aspect of the development of drilling technology in today's world. The basic structure of closed-loop rotary drilling tools is designed and basic structure of hydraulic thrust control system which greatly saves the time for hydraulic oil flowing back into the tank is innovatively designed based on Auto Trak RCLS (Baker Hughes). The structure of closed-loop rotary steering drilling tools, hydraulic thrust control system principle diagram, basic structure of hydraulic thrust control system and basic structure of flow pressure differential control valve and basic structure of oil filter assembly are rendered by AutoCAD drawing software.

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21

Roberts, Ruby Clyde, Rhona Flin, Jennifer Cleland, and Jim Urquhart. "Drillers’ Cognitive Skills Monitoring Task." Ergonomics in Design: The Quarterly of Human Factors Applications 27, no. 2 (May 10, 2018): 13–20. http://dx.doi.org/10.1177/1064804617744713.

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Drilling incidents have emphasized that offshore drillers require a high level of cognitive skills, including situation awareness and decision making, to maintain safe and efficient well control. Although a number of tools for supporting operators’ cognition are available in other high-risk industries, there is no specific tool for drilling. We developed a prototype monitoring task simulating drilling scenarios, Drillers’ Situation Awareness Task, with drilling experts and piloted with 14 drilling personnel. Preliminary results suggest that it is viable as a tool for examining drillers’ cognition and has the potential for training and formatively assessing cognitive skills in drilling.

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Neplevksy, M. O. "Modern drilling technologies used for the making bored piles under the conditions of dense urban area." Proceedings of higher educational establishments. Geology and Exploration, no. 5 (November 28, 2019): 70–75. http://dx.doi.org/10.32454/0016-7762-2019-5-70-75.

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The parameters of drilling boreholes (including depth, diameter, angle of borehole inclination, cross-section) that are currently used for the making bored piles under the conditions of dense urban area, have been considered. The review about modern technologies of drilling boreholes used for making bored piles has been prepared. The updated classification of drilling technologies used for the making bored piles, which taking into account the nature of the removal of the destroyed rock and the movement of the drilling tool, the type of drilling tool, as well as the method of mounting the borehole walls, has been proposed. The classification, according to the nature of removal of the destroyed rock, distinguishes technologies providing or not providing the removal of destroyed rock. According to the nature of movement of the drilling tool, the rotary, shock and vibration technologies, as well as a static indentation technology, can be identified. According to the type of drilling tools, the classification divides methods into hollow drill stem with sacrificial drill bit and soil compactor and displacement tools with a starter auger section, augers, drilling buckets, core barrels, belling buckets, roller, impact and three-way bits, grabs. According to the methods of well casing, the technologies can be divided into the ones, allowing and not allowing the casing of well.

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Egashira, Kai, Ryohei Okina, Keishi Yamaguchi, and Minoru Ota. "Drilling of Microholes Using Diamond Grinding Tools." Advanced Materials Research 1136 (January 2016): 435–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1136.435.

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The drilling of microholes in hard and brittle materials by ultrasonic grinding was carried out using polycrystalline diamond (PCD) micropins fabricated by electrical discharge machining. They can be employed as micro-grinding tools because the convex parts of discharge craters formed on the tool surface can serve as cutting edges of abrasive grains in grinding wheels. In the drilling of crown glass, the increase in the grinding force and the generation of cracks and chippings at hole edges were suppressed owing to the high wear resistance of PCD. Under suitable conditions, drilling was also successfully performed in silicon, which is apt to exhibit cracks and chippings at hole edges.

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Mrkvica, Ivan, Miroslav Janoš, and Petr Sysel. "Cutting Efficiency by Drilling with Tools from Different Materials." Advanced Materials Research 538-541 (June 2012): 1327–31. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.1327.

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Development of cutting tools is basic condition for rationalization of process cutting because it goes out from need of processing new constructional materials. From view of tool it takes application progressive cutting materials. Cutting tools so relevantly make for accomplishment main demand on methods of cutting; it is provision of high productivity production and attainment of desideration of finish surface. It is known, that cutting property of cutting tool is influence by many factors.

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Pei, Xue Liang, Jun Liang Xu, and Jie Ran Zhu. "Research and Application of 9-5/8〞Retrievable Casing Drilling Technology." Advanced Materials Research 591-593 (November 2012): 488–92. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.488.

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Combined with present situation of ShengLi oilfield drilling equipments and its matching tools, Drilling Technology Research Institute of ShengLi has carried out research on retrievable casing drilling technology, and made emphasis on the research of the retrievable BHA. Running/Retrieving tool of BHA, Locking device of BHA and Composite bits have been designed and completed. And the laboratory experiments of these key tools have been finished. The field experiments have been finished in He4-GX60 well and Xin110-X16 well. The trial result has proven that the retrievable casing drilling device is simple in structure, the design is rational and it can meet the demand of field application. The construction technique of casing drilling is completely feasible, technical route is right, which satisfied with the field operation requirements

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Palmisano, Andrew C., Bruce L. Tai, Barry Belmont, Todd A. Irwin, Albert Shih, and James R. Holmes. "Comparison of Cortical Bone Drilling Induced Heat Production Among Common Drilling Tools." Journal of Orthopaedic Trauma 29, no. 5 (May 2015): e188-e193. http://dx.doi.org/10.1097/bot.0000000000000240.

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Nagata, Fukuhito, Koji Akashi, and Daisaku Ishibashi. "Fundamental Experiment of Near-Dry Deep Hole Drilling with BTA Tool - The Optimal Cutting Conditions and Tool’s Geometry." Key Engineering Materials 523-524 (November 2012): 109–12. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.109.

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The BTA tool is a tool for deep-hole drilling. The deep-hole which be machined by this tool has the excellent straightness and roughness. However, it's use a lot of cutting oil. Therefore, it will lead to environmental destruction. Thereupon, in this study, it is applied the near-dry system to the deep-hole drilling with BTA tool. In the previously, it was designed the experimental device with a double tube system, and the cutting experiments was carried out. In this system, the chip is discharged through inside of the inner tube. Frequently, the chip is cannot be divided by the adhesion on the cutting edge during drilling. Thereby, the chip was jammed into the inside of tool’s tube. It is tried experiments of various cutting conditions, cutting speed and feed rate, by tools with different geometry, height and width, of the chip-breaker. And, it is observed the discharge condition of chips, the chip’s shape and the situation of adhesion. As a result, it can be found the optimum cutting condition and tool’s geometry for a continuous chip’s discharge while the deep-hole is drilling by a BTA tool in near-dry system.

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Egashira, Kai, Kenichi Kuriyama, Keishi Yamaguchi, and Minoru Ota. "Drilling of Rod End Faces Using Micro-Cutting Tools." Materials Science Forum 874 (October 2016): 227–31. http://dx.doi.org/10.4028/www.scientific.net/msf.874.227.

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There have been few reports on the drilling of microholes on rod end faces by cutting, which can be employed for fabricating micronozzles or microneedles. Such drilling was therefore attempted in the present study using a micro turn-milling machine with the tool and workpiece axes being parallel. The drilling was performed on the end faces of brass rods with cemented tungsten carbide micro-cutting tools processed by electrical discharge machining (EDM). As a result, a microhole 12‍ μm in diameter was successfully drilled using a 10-μm-diameter tool at a feed speed of 0.5‍ μm/s. The feed speed could be increased to 25 μm/s for a tool with a diameter of 20 μm and body length of 50 μm.

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Liu, Zhan Feng, and Meng Xu. "Research on Technology Test of 304 Stainless Steel Super Long Deep-Hole Drilling." Advanced Materials Research 774-776 (September 2013): 1137–40. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.1137.

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In this paper, through the analysis of 304 stainless steel to elaborate the influence of various factors in the process of drilling from the blade material,tool geometry parameters,cutting parameters and drilling methods.It is proved by selecting reasonable processing, cutting tools and cutting parameters (Φ50mm × 4700mm) 304 stainless steel parts of the drilling process issues can be resolved.

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Serikov, D. Yu, V. Yu Bliznyukov, and Yu N. Pilnik. "Design improvement of drilling tools flushing units." Construction of Oil and Gas Wells on Land and Sea, no. 2 (2020): 27–31. http://dx.doi.org/10.33285/0130-3872-2020-2(326)-27-31.

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Novák, P., B. Sajdl, and I. Roušar. "Sparking at cathode tools during electrochemical drilling." Electrochimica Acta 30, no. 1 (January 1985): 43–49. http://dx.doi.org/10.1016/0013-4686(85)80056-6.

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Ciocan, Ion, Mihai Grigorescu, and Dragoș Iliescu. "Bore’s Surface Condition on Single Multifunctional Insert Tools Turning." Applied Mechanics and Materials 834 (April 2016): 102–7. http://dx.doi.org/10.4028/www.scientific.net/amm.834.102.

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Turning is a utilized machining work. It is performed with a large types of tools adapted for required geometries. If starting from a full blank, a drilling operation is called in the beginning. In that case, the number of utilized tools increased. The use of a multifunctional tool for drilling followed by bore turning is an efficient solution. In this research, the case of single insert multifunctional tool is studied. The paper describes the quality of the surfaces obtained by using of this tool. The general idea is to verify the use of only one multifunctional tool for execution of all operations, from full drilling to finished surface. This was made by measuring the roughness Ra in three experiments with different materials: titanium, stainless steel and low carbon steel. Performed experiments lead to the idea of a recommended limit for feed speed to obtain a roughness Ra value below 0.8μm. This limit depends with the material type, but for some materials, it seems impossible to achieve this value!

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Shi, Run Ping, Cheng Yong Wang, and Xi Wang. "Preliminary Study on Carbon Fibre Composites Cutting Technology and Cutting Tools." Materials Science Forum 723 (June 2012): 25–29. http://dx.doi.org/10.4028/www.scientific.net/msf.723.25.

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Carbon fiber reinforced plastics (CFRP)/Ti super hybrid laminates are newly developed structural materials with excellent properties. But they are restricted in aircraft manufacturing because of their poor machining quality and short tool life. The machining quality and tool life are determined by machining ways, tool materials, drill point forms and drilling sequence. Spiral milling, drilling from Ti side, using the PCD tools and carbide drills with special point angle can improve the quality of hole and prolong tool life.

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34

Shyha, Islam, Sein Leung Soo, David K. Aspinwall, Sam Bradley, Stuart Dawson, and Cornelius J. Pretorius. "Drilling of Titanium/CFRP/Aluminium Stacks." Key Engineering Materials 447-448 (September 2010): 624–33. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.624.

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Following a review on the machinability of CFRP composites and multilayer stacks typically comprising metallic and composite material elements, the paper details experimental results when drilling 30 mm thick titanium/CFRP/aluminium workpiece stacks. Testing utilised a modified fractional factorial design based on an L18 Taguchi orthogonal array. This comprised four factors, three of which were at three levels and one at two levels and involved tool coating, cutting speed, feed rate and machining environment. Tools evaluated involved hardmetal and diamond coated carbide in addition to uncoated tungsten carbide drills. Response variables were principally tool wear and cutting force/torque with an end of test criteria of 300m flank wear. Peeling of the CVD diamond coating occurred within the first several holes drilled however this was not a limiting factor in terms of tool life. Principal damage occurred when drilling through the titanium (Ti-6Al-4V) rather than the aluminium (Al 7050) or CFRP (unidirectional “UD” laminates) sections. Best tool life/performance (310 drilled holes) was obtained with the more conventional uncoated carbide drills at lower cutting speed and feed rate. Typically thrust forces increased from 300 N for the first hole to ~2200 N for last hole drilled while torque values were generally below 600 N.cm for worn tools.

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35

Quan, Yan Ming, Liang Liang, and Wen Wang Zhong. "The Experimental Research on Small Hole Machining in Glass Using Diamond Abrasive Core-Tools." Advanced Materials Research 76-78 (June 2009): 491–96. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.491.

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Glass is a kind of difficult-to-machine material due to its hard and brittle properties. Although many special hole machining methods for brittle and hard materials have been developed, the traditional drilling is still widely applied because it is simple and reliable. However, the drilling tool for hard and brittle material is an obstacle, especially for small hole drilling. In this paper, two types of diamond abrasive core-tools which are made by electroplating and sintering process are used to machine small holes in glass plates, their structures are introduced and their machining performances are compared. The experimental result indicates that these diamond abrasive tools are satisfied for small hole machining in glass, and the performance of electroplating tool is better than that of sintering one.

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36

Liu, Gang, Ming Chen, Lu Lu Jing, Z. G. Hu, X. F. Zhu, Z. W. Li, and H. Xu. "The Development of Special Drills for High-Efficient Drilling Austenitic Stainless Steel Part I: Drill Comparison and Experiment Research." Key Engineering Materials 315-316 (July 2006): 195–99. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.195.

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Austenitic stainless steel is a kind of difficult-to-cut material widely utilized in various industry fields. But cutting tools is the uppermost obstacle in the application of high efficient and precise machining of austenitic stainless steel. Drill is the one of the most complicated universal cutting tools, whose geometry structure influences greatly on drilling performance. So the development of special drills is imperative for high-efficient drilling. This paper presented the optimal geometrical characteristics of the special drills, with138° point angle and 38° helix angle, for high-efficient drilling austenitic stainless steel. The drilling performance has been evaluated completely and comprehensively through the experiments including measuring cutting deformation coefficient, thrust force, torque, cutting temperature near the cutting point, cutting tool life, drill wear mechanism and so on. The special drill indicated appreciated cutting performance during drilling austenitic stainless steel with high efficiency. Compared to the commercial available standard drill with 118° point angle and 32° helix angle, the cutting tool life of the special drill was 1.6 times of the standard drill and the special drill yielded good performance of chip evacuation, good wear resistance and great drilling quality.

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37

Li, Rui, and Albert J. Shih. "Tool Temperature in Titanium Drilling." Journal of Manufacturing Science and Engineering 129, no. 4 (April 1, 2007): 740–49. http://dx.doi.org/10.1115/1.2738120.

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The spatial and temporal distribution of tool temperature in drilling of commercially pure titanium is studied using the inverse heat transfer method. The chisel and cutting edges of a spiral point drill are treated as a series of elementary cutting tools. Using the oblique cutting analysis of the measured thrust force and torque, the forces and frictional heat generation on elementary cutting tools are calculated. Temperatures measured by thermocouples embedded on the drill flank face are used as the input for the inverse heat transfer analysis to calculate the heat partition factor between the drill and chip. The temperature distribution of the drill is solved by the finite element method and validated by experimental measurements with good agreement. For titanium drilling, the drill temperature is high. At 24.4 m/min and 73.2 m/min drill peripheral cutting speed, the peak temperature of the drill reaches 480°C and 1060°C, respectively, after 12.7 mm depth of drilling with 0.025 mm feed per cutting tooth. The steady increase of drill temperature versus drilling time is investigated.

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38

Quan, Yan Ming, Jia Jia Chen, and Hao Xu. "The Investigation on Small Hole Drilling-Grinding in Glass and Ceramic." Advanced Materials Research 126-128 (August 2010): 258–62. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.258.

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Making holes in glass or ceramic with conventional twist drills is difficult because of the hard and brittle properties of the workpieces, but the drilling-grinding process with diamond core-tools has found application in the field due to its high efficiency and low cost. However, small hole drilling-grinding with the core tools is still a challenge because the small core tools have a limited strength and chip-removal capacity. In this paper, the small hole drilling-grinding in glass and ceramic by diamond core-tools with 4mm diameter is experimentally investigated, the drilling-grinding force and heat are measured and calculated, the performances of two types of electroplating diamond core tools are compared.

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Qiao, Yang, Xing Ai, and Zhan Qiang Liu. "Research on Cutting Performance of High-Speed Steel Drills during Drilling the Powder Metallurgy Nickel-Based Superalloy." Key Engineering Materials 464 (January 2011): 556–59. http://dx.doi.org/10.4028/www.scientific.net/kem.464.556.

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The present paper is an experimental investigation on the machinability of powder metallurgy (PM) nickel-based superalloy during drilling using high-speed steel (M42) drills. The effect of machining parameters on the cutting force, cutting temperature and tool wear were investigated during the experimentation. The effect of machining parameters on the tool wear was examined through SEM micrographs. The research work findings will also provide useful economic machining solution by utilizing economical high-speed steel drills during drilling processing of powder metallurgy nickel-based superalloy, which is otherwise usually machined by costly coated carbide tools or CBN tools. The present approach and results will be helpful for understanding the machinability of powder metallurgy nickel-based superalloy during drilling for the manufacturing engineers.

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Yan, M. P., and H. Shao. "Study on High-Speed Drilling of SUS304 Based on FEA." Advanced Materials Research 188 (March 2011): 529–34. http://dx.doi.org/10.4028/www.scientific.net/amr.188.529.

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Experimental explorations for optimal cutting conditions on high speed drilling processes could be expensive and risky both to machine tools and operators. In this study, high-speed drilling of SUS304 stainless steel with a TiN-coated drill was simulated for optimized drilling conditions. Tool wear mechanism as well as chip formation processes was also explored based on finite element analysis (FEA). It was found with the simulations that higher cutting speed came up with smaller tool wear.

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Lyskanych, M. V., O. О. Slabyi, and B. O. Berezhnytskyi. "Analysis of wave disturbance in the drill string while releasing stuck pipes." Oil and Gas Power Engineering, no. 1(33) (September 3, 2020): 7–18. http://dx.doi.org/10.31471/1993-9868-2020-1(33)-7-18.

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The work is devoted to testing the hypothesis about the possibility of assessing the nature of the release of the drilling tool by percussion devices by analyzing the response of the system in the form of vibration records of the upper end of the drilling tool. For this purpose, based on the examined existing theoretical models, a wave diagram of the propagation, reflection and interference of deformation waves caused by the operation of the percussion device along the tacked drilling tool is constructed. Based on the developed diagram, a prediction is made of the nature of the oscillatory processes of the upper end of the drilling tool of a typical design located in a vertical well and the nature of their occurrence is explained. Based on the presented theoretical model the authors made an analysis of records in relative units of the vibration velocity of the upper end of a drilling tool in two specific cases of freeing stuck drilling tools in wells No. 812-Pasichna and No. 903-Pasichna of Nadvirna and Ivano-Frankivsk UBR, where they used VUK-170 that worked in jar mode. For this purpose, the time-frequency representation of the obtained records in the form of spectrogram, scalogram and Wigner-Ville pseudo-distribution was performed, and, based on the obtained theoretical prediction of oscillations of the upper end of the drilling tool, the time of the following stages of the percussion cycle – striking, impact and post – was established. Based on the data obtained, a time-frequency impact assessment was carried out and the character of the attenuation of deformation waves in the drill string was evaluated. Based on the well-known arrangement of stuck drilling tools, the propagation speed of deformation waves along the drill string is determined, which turned out to be more than theoretically calculated for an ideal thin rod according to the wave equation. The paper considers further directions of development of the proposed approach, as well as the use of its results to increase the efficiency of the freeing of stuck tool using impact tools.

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Wu, Hong Bing, Zhi Xin Jia, Xue Chang Zhang, and Chen Guang Xu. "Study on Experiment of Drilling for Titanium Alloy Ti6Al4V." Applied Mechanics and Materials 37-38 (November 2010): 1283–86. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.1283.

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The quality of hole is difficult to be guaranteed and tools wear severely in the drilling process of titanium alloy. To investigate more efficient methods to improve the quality of holes, the drilling experiments of titanium alloy Ti6Al4V were carried out under different drilling speed and different feeding speed. The drilling force was achieved through the dynamometers in the experiment. Simultaneously, a series of drilling experiment of titanium alloy was carried out with the two different shape drills and three different diameter drills. The comparison of the achieved drilling force proved that the sharpened tool is better to guarantee the quality of hole for titanium alloy Ti6Al4V.

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43

Zhang, Weiwei, Shengyuan Jiang, Dewei Tang, Huazhi Chen, and Jieneng Liang. "Drilling Load Model of an Inchworm Boring Robot for Lunar Subsurface Exploration." International Journal of Aerospace Engineering 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/1282791.

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In the past decade, the wireline robot has received increasing attention due to the advantages of light weight, low cost, and flexibility compared to the traditional drilling instruments in space missions. For the lunar subsurface in situ exploration mission, we proposed a type of wireline robot named IBR (Inchworm Boring Robot) drawing inspiration from the inchworm. Two auger tools are utilized to remove chips for IBR, which directly interacted with the lunar regolith in the drilling process. Therefore, for obtaining the tools drilling characteristics, the chips removal principle of IBR is analyzed and its drilling load model is further established based on the soil mechanical theory in this paper. And then the proposed theoretical drilling load model is experimentally validated. In addition, according to the theoretical drilling load model, this paper discusses the effect of the drilling parameters on the tools drilling moments and power consumption. These results imply a possible energy-efficient control strategy for IBR.

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44

Pushmin, Pavel. "Research results of deformation processes when drilling isotropic rocks by diamond drilling tools." Proceedings of the Siberian Department of the Section of Earth Sciences of the Russian Academy of Natural Sciences. Geology, Exploration and Development of Mineral Deposits 42, no. 1 (March 2019): 78–85. http://dx.doi.org/10.21285/2541-9455-2019-42-1-78-85.

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45

Kalsi, M. S., P. D. Alvarez, D. Somogyi, and Aaron Richie. "Load-Responsive Hydrodynamic Bearing for Downhole Drilling Tools." Journal of Tribology 129, no. 1 (November 6, 2006): 209–17. http://dx.doi.org/10.1115/1.2404963.

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A load-responsive hydrodynamic thrust bearing has been developed that has capabilities to operate under higher load and speed combinations than the current bearing designs used in roller cone drill bits, downhole drilling motors, and other downhole drilling tools. The bearing dynamic surface, which is initially flat, deflects elastically under load to provide an efficient hydrodynamic geometry that generates a lubricant film, with a minimum film thickness that varies from 0.25 to 2.0μm. The bearing operates with friction coefficients typically in the range of 0.003 to 0.005, which are significantly lower than the conventional roller cone bit thrust bearing designs that operate in a boundary/mixed lubrication regime. Lower friction will allow bit seals to run cooler, and higher load/speed capabilities will increase drilling efficiency and extend component life in hard rock formations. Additionally, the new bearing is suitable for applications where tilting pad thrust bearings are used, offering the advantage of being simple, compact, and more economical.

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46

Hồ Dương, Đông. "Testing drilling tool intergrating damping system using machining test method." Journal of Science and Technology Issue on Information and Communications Technology 17, no. 6 (June 30, 2019): 56. http://dx.doi.org/10.31130/jst-ud2018-346e.

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In this paper, machining test in lathe machine is used to check the characteristics of damped drilling tool and damped clamp tool. The testing results are then compared with those of conventional drilling tool and clamp to see the differences. The damped tool achieves better quality surface while mounting 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. Taguchi method is conducted to find the optimal cutting parameters for each combination of drilling tools and clamping devices. This paper follows the results of the published article on The Journal of Science and Technology – The University of Danang December 2017, named “Research on characteristics of drilling tool intergrating damping system using Experimental Model Analysis”.

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47

Ohnishi, Osamu, Hiromichi Onikura, Toshihiko Eguchi, Muhammad Aziz, Toshiro K. Doi, and Syuhei Kurokawa. "Improvement in Drilling Performance of Micro Compound Tool." Key Engineering Materials 447-448 (September 2010): 96–100. http://dx.doi.org/10.4028/www.scientific.net/kem.447-448.96.

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The present paper deals with the development of micro compound tools and their application to the micro drilling. The micro compound tool consists of a micro drill part and an electroplated part with a nominal finishing diameter of 100 µm and they are fabricated by grinding and electroplating processes. Fabricated tools are used in drilling tests with or without ultrasonic vibration. Influences of drill part geometry on burr formation and influences of diamond grit size on peeling of the electroplating layer are investigated. As the results, secondary cutting edges do not seem to have remarkable ability for reduction of burrs. And large size of diamond grit at the electroplated part of a micro compound tool with a small difference between a diameter of electroplated part and a diameter of drill part seems to be effective in preventing peeling of the electroplating layer and improving drilling performance.

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Huang, Leilei, Qilong Xue, Baolin Liu, Chunxu Yang, Ruihe Wang, and Laiju Han. "Dynamic Reliability Analysis of Rotary Steering Drilling System." Mechanical Sciences 10, no. 1 (February 19, 2019): 79–90. http://dx.doi.org/10.5194/ms-10-79-2019.

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Abstract. Vibration and high shock are major factors in the failure of downhole tools. It is important to study the causes of vibration and shock formation to prevent failure of the drillstring and bottom hole assembly (BHA). At present, it is generally recognized that the vibration of drillstring is the main reason for the failure, especially the lateral vibration. In this paper, the bottom tool of Rotary Steering Drilling System (RSS) calculation model was established based on the secondary development of ABAQUS software. Starting from the initial configuration of drilling tool, considering the contact impact of drilling tool and borehole wall, the dynamic excitation of guide mechanism and the drilling pressure, torque, rotational speed, gravity, buoyancy, drilling fluid damping. The dynamic characteristics of the inherent frequency and dynamic stress of the bottom hole assembly (BHA) were calculated and analyzed, and risk assessment method based on the quantitative vibration intensity was established. The reliability of typical drilling tool is evaluated, which provides a reference for the optimization design of BHA of Rotary Steering Drilling System.

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Peng, Qun, Quan Hou Li, and Qi Zhang. "Application Status of the Technology of Logging While Drilling." Advanced Materials Research 1010-1012 (August 2014): 1650–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1010-1012.1650.

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The data of Logging While Drilling is used for Geosteering and evaluation of layers. Compared with traditional logging, LWD has its own advantages, real-time, security, and it could obtain original information of the destination formation.With the rapid development of logging tools design, LWD tools have a large improvement, and various tools used for measuring the parameters of layers have been designed and applied , resistivity imaginary logging tool, MPR, InSite ADR, Shock Wave have been invited and innovated. However, there are still a lot of unsolved problems existing, such as interpretation of logging, the accuracy of the evaluation on layers and so on. Therefore, numerous work need to be done in the future.

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50

Lin, Tieyu, Jinyang Xu, Min Ji, and Ming Chen. "Drilling performance of uncoated brad spur tools for high-strength carbon fiber-reinforced polymer laminates." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 235, no. 8 (April 7, 2021): 1879–89. http://dx.doi.org/10.1177/1464420721990413.

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High-strength carbon fiber-reinforced polymers have been a promising alternative to conventional fibrous composites because of their extremely high properties. Mechanical drilling is a necessary operation to create boreholes for riveting and bolting different composite structures into assemblies. However, the high-strength carbon fiber-reinforced polymers pose much more serious machining issues than the conventional ones. The present work aims to investigate the drilling performance of one type of uncoated carbide brad spur tools when applied in machining of high-strength carbon fiber-reinforced polymer laminates. The wear mechanisms of uncoated carbide brad spur drills were figured out. Additionally, the tool wear influences on the thrust force, hole dimensional accuracy, and drilling-induced delamination were quantified. The acquired results indicate that the tool wear has a significant impact on the drilling process and the quality of machined hole wall surfaces. The dominant wear mode is proved to be abrasion wear. Moreover, the uncoated brad spur drills appear to exhibit high resistance to the abrasion wear in the drilling of high-strength carbon fiber-reinforced polymer laminates.

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Journal articles on the topic 'Drilling tools'

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