Academic literature on the topic 'Cutting-off technology'
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Journal articles on the topic "Cutting-off technology"
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Wu, Yong Sheng, Jian Jiang Wang, Wen Tong Xin, Zhi Zun Li, and Li Feng Qu. "Study on Cutting Process of Manual SHS Cutting Technology." Advanced Materials Research 189-193 (February 2011): 3208–12. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3208.
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Cutting process of manual self-propagating high-temperature synthesis (SHS) cutting technology was studied based on industrial Q235 steel specimen and cut material of cutting pen. Through research of kerf and analysis of manual SHS cutting process, three zones of base metal is formed under the cutting pen process: molten zone heated directly by cutting pen, the common active zone of cutting pen , metal flow and slag flow, metal flow and slag flow heating zone. Its cutting process can be divided into four inter-related stages as follows: the formation stage of the molten pool, the increasing stage of the pool penetration, the stage of slag blowing off and kerf formation and then the formation stage of a new pool. The way to improve efficiency of manual SHS cutting technology is proposed at the end.
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Ma, Xingen, Manchao He, Weidong Li, Yilong Wang, Lifeng Li, Xiaohu Sun, Yongyuan Li, Leiyu Gu, and Xingfeng Sha. "Research and Application of Open-Off Cut Roof Cutting Pressure Releasing Technology." Advances in Civil Engineering 2021 (May 11, 2021): 1–14. http://dx.doi.org/10.1155/2021/9989213.
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The first weighting control is one of the difficult problems that cannot be avoided in the safe and efficient production of longwall mining face. To optimize the existing pressure releasing technology of open-off cut, the open-off cut roof cutting pressure releasing (OCRCPR) technology is put forward on the basis of roof cutting pressure releasing gob-side entry retaining (RCPRGER) technology. Firstly, the mechanism of the technology and the design method of related key parameters are summarized. Then the pressure releasing effect of OCRCPR and the stress environment change under this technology are analyzed by mechanics calculation and numerical simulation, respectively, which verify the feasibility of the OCRCPR technology from the theoretical level. Finally, a test mining face is taken as an example to implement the field test. The field test results show that the OCRCPR can effectively shorten the first weighting step and weaken the first weighting strength and has a good pressure releasing effect.
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Wu, Jun Jie, Zhuo Shang Ji, and Hui Qing Chang. "Path Optimization in Hull Part Cutting Based on Seven Bridges Problems." Advanced Materials Research 476-478 (February 2012): 2042–47. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.2042.
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Generally the process of hull part cutting is that the part can not be cut until the previous part has been cut. This mode is poor cutting efficiency and high cutting cost. Based on the famous Seven Bridges Problems, this paper models the cutting problem and then presents a brand-new cutting technology, the bridge cutting. In this technology, only one pierce point is enough to cut off all the parts that lie in the same level. The example shows that the technology is effective for reducing the numbers of pierce points and shortening the length of idle cutting path, which not only improves the cutting efficiency but also saves the cutting cost.
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Nakano, Taketo, Kohzo Abe, Hiroshi Kubo, and Akira Kobayashi. "Newly Developed Dressing Technology for Cutting-off Sialon (Si-AI-O-N) Ceramics." CIRP Annals 38, no. 1 (1989): 327–30. http://dx.doi.org/10.1016/s0007-8506(07)62715-2.
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Chen, Yang, Longsheng Lu, Xiaokang Liu, Yingxi Xie, Zhenping Wan, and Zhaorui Hou. "Comparative investigation of carbon fiber filaments in off-axis transverse cutting between flexible-support and non-support method under pre-tension." Journal of Engineered Fibers and Fabrics 14 (January 2019): 155892501983781. http://dx.doi.org/10.1177/1558925019837812.
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Short carbon fiber is an effective and essential reinforced material in composite domains. Generally, it is produced by chopping technology, among which pressing roller and grooved wheel are two popular chopping techniques. According to the working principle of these two techniques, the pressing roller can be simplified as a flexible-support cutting in off-axis transverse cutting, meanwhile the grooved wheel can be represented by a non-support cutting. To reveal the fracture difference of carbon fiber between the pressing roller and the grooved wheel technique, comparative investigation of failure behavior between a single carbon fiber (also simplified as a filament) with flexible support and with non-support was performed in off-axis transverse cutting using a custom-designed fixture. Both the cutting force and the fracture surface of the filament were comparatively analyzed in cutting process. It was found that the failure of single carbon fiber was caused by tensile effect in a non-support cutting, whereas that in a flexible-support cutting was caused by bending effect. The cutting-off force and cutting-off depth of filament cut by use flexible support are significantly lower than that by use non-support under low pre-tension. It is interesting to find out that the failure spot of carbon fiber filament in non-support cutting under low pre-tension tends to occur randomly. Meanwhile, in a flexible-support cutting, the break point of carbon fiber filament is determined by the tip of the blade. After a comprehensive comparison, the flexible-support cutting is a prior selection to produce short carbon fibers compared with the non-support cutting.
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Wang, Fei, Da Jun Yuan, Rong Cai, Yong Jiang Mu, and Meng Shu Wang. "Field Test Study on Cutting Obstacle Piles Directly by Shield Cutters." Applied Mechanics and Materials 353-356 (August 2013): 1433–39. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.1433.
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Shield cutting obstacle pile directly has significant economic and social benefits compared to traditional methods, however, the corresponding cutting technology is far from mature currently in the international. Based on the construction need of cutting 14 bridge piles with the diameter of 1.0~1.2 meters by Suzhou subway shield, the preliminary scheme of cutter configuration was studied and proposed first, and then the worlds first field test of shield cutting reinforced concrete piles was carried out, the effect and rule of shield cutters cutting piles were analyzed, and the cutter configuration scheme was verified and optimized. The test results indicate that the shell cutter is fit for cutting reinforced concrete pile, its cutting effect on rebar and concrete is shear cutting; In order to make rebar shorter, we should make the rebar be cut off instead of pulled off as possible as we can. The main damage form of shell cutter is alloy cracked. Cutting side pile produces more damage on shell cutter than cutting central pile. The shell cutter configuration scheme should not only satisfy the whole cutting ability and covering the entire cutting plane, but also to be favorable to fix rebar by surrounding concrete.
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Wang, Sen, Wen Tong Xin, Li Feng Qu, Yi Ying Wu, and Jian Dong Yang. "Study on Length of Cartridge how to Affects Cutting Capability of the Combustion Cutting Ammunition." Applied Mechanics and Materials 275-277 (January 2013): 2248–51. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.2248.
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A type of cutting technology of manual thermite cutting technology is developed which is meet the incise requirements in especial environmental .The combustion cutting ammunition is made from cutting medicament, cartridge, nozzle. There are two synchronism courses of events to form the hole. Firstly, specimen is melted by megathermal jet stream, and then heating specimen to its burning point so that it burns with oxygen which is from jet stream and reduces melting point of specimen with alloy agent. The bright and clean hole comes into being after blowing off the slag by high-speed airflow. The paper ensured proper length of the cartridge and analyzed burning characteristics of cutting medicament by different length. The best cutting Performance be obtained While the length of cartridge is up to 90mm test on steel of Q235 which area is 2800mm2 and thick is 20mm.
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Skrobak, Adam, Michal Stanek, David Manas, Martin Ovsik, Vojtech Senkerik, and Martin Reznicek. "The Effect of Technology on Micromechanical Properties of Rubber." Key Engineering Materials 662 (September 2015): 261–64. http://dx.doi.org/10.4028/www.scientific.net/kem.662.261.
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The aim of this article is to demonstrate to what extent there is an impact on the micromechanical properties of a standardized testing sample made of rubber compound based on synthetic rubber EPDM and produced by injection molding in comparison with a sample produced by classic preparation (cutting off a compression molded plate). Measurement of the properties was carried out according to the instrumented test (DSI), in compliance with ISO 14577 on the measuring device micro-combi-tester.
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Madić, Miloš, Marko Kovačević, Miroslav Radovanović, and Vladislav Blagojević. "SOFTWARE TOOL FOR LASER CUTTING PROCESS CONTROL – SOLVING REAL INDUSTRIAL CASE STUDIES." Facta Universitatis, Series: Mechanical Engineering 14, no. 2 (August 2, 2016): 135. http://dx.doi.org/10.22190/fume1602135m.
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Laser cutting is one of the leading non-conventional machining technologies with a wide spectrum of application in modern industry. It order to exploit a number of advantages that this technology offers for contour cutting of materials, it is necessary to carefully select laser cutting conditions for each given workpiece material, thickness and desired cut qualities. In other words, there is a need for process control of laser cutting. After a comprehensive analysis of the main laser cutting parameters and process performance characteristics, the application of the developed software tool “BRUTOMIZER” for off-line control of CO2 laser cutting process of three different workpiece materials (mild steel, stainless steel and aluminum) is illustrated. Advantages and abilities of the developed software tool are also illustrated.
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Xingen, Ma, He Manchao, Wang Yajun, Zhang Yong, Zhang Jiabin, and Liu Yuxing. "Study and Application of Roof Cutting Pressure Releasing Technology in Retracement Channel Roof of Halagou 12201 Working Face." Mathematical Problems in Engineering 2018 (November 12, 2018): 1–15. http://dx.doi.org/10.1155/2018/6568983.
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The retracement channel roof cutting (RCRC) technology can change the overburden structure actively by cutting off the roof of channel along the direction of working face tendency and make use of the gangue collapsing from roof cutting range to fill the goaf and weaken the mining pressure during the retracement process of working face. In order to solve the problems of high stress in surrounding rock and serious deformation of retracement channel in Halagou coal mine, it is the first time that the pressure releasing test is carried out on the 12201 working face by the method of the directional presplitting roof cutting in retracement channel. First, according to statics theory and energy theory, the stress state of hydraulic support and roof deformation mechanism of retracement channel are analyzed. Then the roof cutting design of retracement channel is determined according to the geological conditions of 12201 working face, and the cutting effect is analyzed by numerical simulation. Finally, the field test is carried out on the 12201 working face to verify the effect of pressure releasing by roof cutting. The result shows that, with the roof cutting design including the roof cutting height being 8m and roof cutting angle being 45°, the roof subsidence of the 12201 working face retracement channel in Halagou mine is reduced to 132.5mm, and the hydraulic support resistance is maintained at 1361KN. And there is no hydraulic support crushed; the deformation of the retracement channel is also small; namely, the effect of roof cutting for pressure releasing is obvious.
Dissertations / Theses on the topic "Cutting-off technology"
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Koláček, David. "Zefektivnění technologie rozbrušování konstrukčními úpravami." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232196.
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This thesis is oriented to technological and design direction. It is focused on the upgrading of existing machinery from a structural perspective. There is studied the impact of design modifications to the existing production process from a technological point of view. This thesis is specifically concentrated on the technology division of the material, especially on the technology cutting-off in dry condition. There is examined the ability of self-sharpening cutting tools and the quality of the final product under varying input conditions. The job is finished by the carried out techno-economic evaluation, where are compared the costs of the structural adjustments in comparison with mechanical equipment, that could be purchased on the market. The thesis is finished with overall analysis of the optimal efficiency of the production process.
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ko, Chenchang, and 柯振璋. "Optimization off glass cutting technology for panel applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/q8a8f2.
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碩士國立高雄海洋科技大學
微電子工程研究所
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It is been a long time that most important factors of cutting process are the extension of the depth and the pattern of cutting substrate. According to the experience of machine vendor and engineer to try and error, we realized how to control parameters of cutting process, but we don’t know they must control in how much scopes that the loss rate of cutting process does not become worse. The concept of increasing the utility rate of substrates is to design slim-border panel for a substrate cutting more panels to reduce cost and to increase product competitiveness. In other words, cutting slim-border panels form 2.4mm to 1.8mm sometimes scraps more panels and it violate the concept of increasing product competitiveness. The study is to optimize parameters to cutting slim-border panel and to find the relationship between parameters and the loss rate of cutting slim-border panels then we could also provide experience for improving cutting quality in the future.
Book chapters on the topic "Cutting-off technology"
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Sasikala, A., and T. Muthamizhan. "Smart Home LPG Application Using GSM Network and Controlling Black-Marketing by RFID Technology." In Intelligent Systems and Computer Technology. IOS Press, 2020. http://dx.doi.org/10.3233/apc200136.
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The life style of an Indian family if evolving, particularly in the urban environment. Everyone in the family is perpetually busy, from the head of the family to possibly the youngest member of the family. As a result, essential works related to kitchen gas in the home gets neglected. Individuals for the most part know that gas can be death-defying. In any case, furthermost individuals still go out on a limb that can prompt damage. The greater part of these cases appears to be accustomed, so suggestions to utilize gas securely are continually required. This project aims at presenting a gas leakage detection kit to systematically detect the gas leakage and stop the gas leakage in sensitive locations by closing the gas cylinder valve automatically to ensure of further no leakage. Here specific gas sensor has been utilized which has high reactiveness for propane (C3H8) and butane(C4H10). Gas spillage system comprises of GSM (Global System for Mobile correspondences) module, which cautions the client by sending SMS. Additionally, an automated kitchen gas booking is also done in this project when the LPG goes empty. An innovative Radio Frequency Identification (RFID) based solution is used to avoid the usage of domestic cylinders in commercial sectors by automatic valve closing of cylinders and thus cutting off the gas supply.
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Rodrigues, Dario de Oliveira. "Blockchanging Trust." In Political and Economic Implications of Blockchain Technology in Business and Healthcare, 1–41. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7363-1.ch001.
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By cutting transaction costs and streamlining agreements' execution via “smart contracts,” blockchain technology (BT) turns decentralization into an economic advantage and an antidote against politically harsh decisions that can obliterate privacy, freedom, and democracy. Although BT's ethical bottom line is still uncertain, its use can smooth out the trade-off between privacy and convenience, reconciling both. BT can also help reconfigure the compromise between intellectual property rights and the common good, opening more ethical routes to the diffusion of innovation. BT's data security can be translated into straightforward access to information. On the one hand, this signals new inclusion routes for “identityless” and unbanked people, and on the other, it releases society from biased information and fake news providing access to trusted data. BT guarantees contents precision, distributing a consensual tamper-proof “hyperledger” proving transactions' authenticity and data's integrity. As consensus should be plural, BT's decentralization is thought to be a must in ethical terms.
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Fox, Dov. "Conclusion." In Birth Rights and Wrongs, 165–74. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190675721.003.0012.
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We’re used to blaming randomness or cosmic injustice when we don’t get the child we want, or when we get the one we don’t. Now cutting-edge interventions promise to deliver us from the vagaries of natural conception and the genetic lottery: Birth control and abortion prevent parenthood; gamete donation and IVF make procreation possible; and prenatal testing can detect debilitating offspring diseases even before pregnancy. These undertakings are still riddled with uncertainty—sometimes things just don’t work out; but that’s no reason to turn a blind eye when bad behavior is at fault. The American legal system protects against professional negligence in other inherently risky activities, from riding in a car to preparing a meal. Courts lay off when fate or accidents are responsible—when deer pop out onto dark roads, or homemade chicken is undercooked. But the law doesn’t hesitate to respond when auto crashes are traced to defective brakes, or food poisoning to unsanitary farming. Reproductive medicine and technology shouldn’t be any different—the stakes are high, and important interests hang in the balance. Just because would-be parents are accustomed to disappointment—because many of us have resigned ourselves to spontaneous miscarriage, or unplanned pregnancy, or an unexpected roll of the genetic dice—doesn’t make those outcomes any less serious, or misconduct that produces them any less worthy of recovery. Reproductive negligence today goes undeterred, unreported, and unredressed—the architecture of rights for procreation deprived, imposed, and confounded equips us to rethink and resolve the controversies that lie ahead.
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"Whalen et al. FIGURE 3 Side and cross-sectional views of an atmospheric cereal cooker commonly known as the James Cooker. (From Ref. 66.) factors in the cook. A trade-off between mechanical versus heat-damaged corn, excessive fines or flour, and new crop thermal input is often the solution for making half-prod-year variations. ucts for flaking or puffing. This requires the equipment to Doughs are usually subjected to forming via a second be operated within a fairly narrow margin to achieve ap-extrusion step, dough conditioning or sheeting. Materials propriate downstream results. Product defects originating are usually face cut off a forming extruder or dried slightly in the cook are usually not salvaged by adjustments in unit to allow sizing and cutting. Extruded doughs may be pro-operations downstream in the production process. Ingredi-duced in strands or strips directly off the extruder to elimi-ent quality, especially grain based, can have a dramatic im-nate the need for a separate forming extruder or sheeting pact on extrusion operations. This includes such common operation [11,92]. In twin screw extruders, this necessi-issues as sprout damage in wheat, rancidity in oat flour, tates matching the cook section with the requirements for." In Handbook of Cereal Science and Technology, Revised and Expanded, 638–47. CRC Press, 2000. http://dx.doi.org/10.1201/9781420027228-64.
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Burgess, Stephen, Carmine Carmine Sellitto, and Stan Karanasios. "A Look at the Future." In Effective Web Presence Solutions for Small Businesses, 275–301. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-224-4.ch011.
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This chapter serves to raise an awareness of some of the more cutting edge Internet innovations and applications that may become viable and useful to the small business operator in future. The chapter focuses on some of the new and emerging forms of technologies that the authors have identified as potentially affecting the Web presence. Consequently, the topic areas and content examined in the chapter does not claim to be all encompassing or prescriptive. Some of the innovations examined are nascent and may not progress to a critical mass for general adoption, whilst others tend to be used by larger business entities, possibly requiring a re-configuration if they are to be successfully used in the small business environment. Arguably, many if not all would in some way impact on the business Web presence if they were to be adopted in future. An examination of the adoption and use of new forms of technology and ideas - or innovations as they are sometimes referred - can be assisted by examining how the early adopters use these innovations. This was briefly discussed in Chapter IV. The concept of innovation adoption and the importance of early adopters is well documented by Rogers (1995). The Rogers’ paradigm describes how innovations advance, or diffuse, through a population either to be adopted or to be rejected. The successful diffusion of an innovation generally follows the S-shaped rate of adoption when a cumulative curve is plotted. The cumulative S-shaped rate of adoption curve is depicted in Figure 1 showing the relationship between the adopters and late-adopters over a period of time. Generally, the adoption of the innovation by the early adopters results in an adoption curve that is reasonably flat. However, as more members of a business group adopt the innovation, the curve ‘takes off’, with the advent of late adopters signalling the innovation has diffused through that particular group. Clearly, for the small business operator an indicator of an innovation that may be associated with a Web presence can be closely allied in the identification of the early adopters. The early adopters are important in the diffusion process as opinion leaders - where potential adopters look to them for advice and information, as well as best practices to emulate. Moreover, the early adopters are considered to be the individuals to investigate or analyse before using a new idea, tending to serve as role models for many others. Early adopters can be deemed to be the most important constituent in the innovation-diffusion process because they decrease uncertainty about a new idea or technology, and as a consequence convey a message of acceptance and effectiveness to peers (Rogers 1995). According to Norman (1998), the early users of an innovation provide the experience for the late adopters to observe and to learn from. Norman further suggests that even though these early users are relatively few in number, they are the drivers of a technology and can provide examples of how and why that innovation can be used. Arguably, the small business operator by conducting an examination within their own industry for the specific use of new forms of Web-related technology will identify a set of industry early adopters from which they themselves can learn from. Small businesses have been known to be conservative in nature in relation to their use of ICTs, so many feel quite comfortable with the notion of waiting until the early adopters have been successful or otherwise. Of course, if the adoption has been successful they do not necessarily achieve the same level of benefits (often resulting in competitive advantage) that early adopters realise, but at the same time they are not taking the same risk with an unknown technology. Often, the late adopter is forced to adopt the technology as it has diffused through the majority of the industry as is regarded as a requirement by business partners or customers.
Conference papers on the topic "Cutting-off technology"
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Yang, Rui, Cheng Yang, Xiaoya Cui, and Zhexu Zhang. "Silver dendrite-based nanocomposites for current cutting-off fuse." In 2015 16th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2015. http://dx.doi.org/10.1109/icept.2015.7236627.
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Doyen, Ioana, Christophe Chagnot, Christophe Journeau, Emmanuel Porcheron, Thomas Gelain, and Damien Roulet. "Deep Gouging Technique for Fuel Debris Retrieval in Fukushima Daiichi." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16701.
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Abstract Laser cutting, a contactless remote controlled process, was assessed for nuclear decommissioning applications, in full through-thickness-cutting (emerging cutting) and deep gouging (non-emerging) conditions. This work aims at presenting specific tools developed and implemented at CEA Saclay, to evaluate and to optimize new cutting strategies, in terms of robustness and reliability, in order to best adapt the laser cutting process to fuel debris retrieval specificities of Fukushima Daiichi reactors. Several configurations for deep gouging have been tested in DELIA facility to reach more than 40 mm of cut-thickness in one pass with an 8kW laser power. First, the laser cutting process was assessed on fused cast zirconia blocks and then on 316L stainless steel and fuel debris simulant blocks. This paper presents the main results of the tests performed in representative conditions of “in site conditions” such as: edge or bulk start/stop cutting, complex surface (i.e. surface with a varying topology) cutting, stand-off variation, angle of cut, trajectories misalignment, and material heterogeneity. Moreover, the excellent performances achieved on 316L stainless steel and fuel debris simulants indicate that deep gouging applied to nuclear decommissioning is a promising technology.
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Otto, Andrew W., and John P. Parmigiani. "Test Apparatus for Powered Saw Chain Systems." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64157.
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The emergence of battery operated landscaping equipment has driven increased scrutiny of the energy usage of such devices. Energy consumption is a primary design constraint for these new yard tools due to the low energy density of current battery technology compared to gasoline. Consumer battery-powered electric chain saws are an example. In order to provide both portability and usability the system’s power use must be understood in detail. Power use associated with cutting, friction, vibration, chip removal, and parasitic loads are all relevant entities in cutting system design. Interface friction between the cutting chain and bar as well as increases in cutting force due to chain vibration are of particular interest. In this work, a test apparatus capable of determining the efficiency of cutting systems for use on chain saws is designed and constructed. Cutting power and frictional losses can be determined with the device under automated, user specified conditions. Operational parameters including chain velocity, feed velocity, and feed load may be used as feedback for device control. A universal mounting and drive system allows for testing with a wide range of off-the-shelf chains, bars, and drive sprockets. Input torque to the chain and reaction forces on the cutting media are recorded outputs which are used to analyze system efficiency. Preliminary work with the machine confirms trends found in existing research literature. Future research performed with the test apparatus will aid in new product design and enhance understanding of energy consumption in chainsaw cutting systems.
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Bicknell, Gregory, and Guha Manogharan. "A Comparison of the Effects of Wire Electrical Discharge Machining Parameters on the Processing of Traditionally Manufactured and Additively Manufactured 316L Stainless Steel Specimens." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88014.
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Wire electric discharge machining (EDM) is a non-traditional machining method that has the ability to machine hard, conductive materials, with no force and high precision. This technology is used in industries, like the aerospace industry, to create precision parts used in high stress applications. Wire EDM is also commonly used in additive manufacturing (AM) applications to remove printed parts from the base-plates onto which they are printed. Numerous studies show the effects of EDM parameters, like pulse-on time, pulse-off time, and cutting voltage, on the processing of traditionally fabricated metal parts. However, very few studies identify how the parameters of wire EDM affect the processing of AM parts. This paper studies the effect of wire EDM pulse-on time, pulse-off time, and cutting voltage on the machining time, surface roughness, and hardness of additively manufactured 316L stainless steel cylinders. The effects of these wire EDM parameters are then tested on the machining time, surface roughness, and hardness of wrought 316L stainless steel cylinders. It was found that machining time of AM samples was statistically significantly lower than wrought samples and also had better surface finish and lower surface hardness.
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Andersson, Olov, Andreas Graichen, Håkan Brodin, and Vladimir Navrotsky. "Developing Additive Manufacturing Technology for Burner Repair." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56594.
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Low emission combustion is one of the most important requirements for Industrial gas turbines. Siemens Industrial gas turbines SGT-800 and SGT-700 use DLE (Dry Low Emission) technology and are equipped with 3rd generation of DLE burners. These burners demonstrate high performance and reliable operation for the duration of their design lifetime. The design and shape of the burner tip is of great importance in order to achieve a good fuel/ air mixture and at the same time a resistance to the fatigue created by heat radiation input. This gives a requirement for a tip structure with delicate internal channels combined with thicker structure for load carrying and production reasons. It was found that the extension of the burner lifetime beyond the original design life could be accomplished by means of repair of the burner tip. Initially the tip repair has been done by conventional methods — i.e. cutting off the tip and replacing it with a premanufactured one. Due to the sophisticated internal structure of the burner the cuts have to be made fairly high upstream to avoid having the weld in the delicate channel area. Through the use of AM (Additive Manufacturing) technology it has been possible to simplify the repair and only replace the damaged part of the tip. Special processes have been developed for AM repair procedure, including: a) machining off of the damaged and oxidized tip, b) positioning the sintered model on the burner face, c) sintering a new tip in place, d) quality assurance and inspection methods, e) powder handling, f) material qualification including bonding zone, g) development of methods for mechanical integrity calculation, h) qualification of the whole repair process. This paper describes how we have developed and qualified SGT-800 and SGT-700 DLE burners repair with the help of additive manufacturing technology and our research work performed. In addition, this paper highlights the challenges we faced during design, materials qualification and repair work shop set-up.
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Keevill, Dave. "Communication Based Train Control Technology Selection." In 2014 Joint Rail Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/jrc2014-3705.
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You have selected Communications-Based Train Control (CBTC) for your new transit line, or as an upgrade to the signaling system on your existing rail network. You look forward with anticipation to the benefits it will bring your agency in terms of capacity, safety and reliability. You plan to release your Request for Proposals to the street and then sit back and watch a pack of ravenous CBTC system suppliers pounce on it, eager to make all your signaling dreams come true. But how do you ensure consistency among the offers, to enable you to select the right system for your operation? How do you specify a system that can reasonably be delivered within your budget and schedule constraints? Should you evaluate based on capital or life cycle cost? What bid evaluation criteria should you employ? There are so many factors to consider: tried and true technology vs. cutting edge; an off-the-shelf solution vs. one customized to the exacting specifications of your Operations and Maintenance departments; the degree to which redundancy should be built into the system; readiness to integrate with other support systems, like the data communications backbone or SCADA. Is one CBTC system architecture a better fit for your property, or is it “six of one, half a dozen of the other”? This paper will address the technical components of these factors, to assist you in selecting the right technology for your CBTC deployment.
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Ahmed, Daiyan, Yingjian Xiao, Jeronimo de Moura, and Stephen D. Butt. "Drilling Cutting Analysis to Assist Drilling Performance Evaluation in Hard Rock Hole Widening Operation." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19286.
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Abstract Optimum production from vein-type deposits requires the Narrow Vein Mining (NVM) process where excavation is accomplished by drilling larger diameter holes. To drill into the veins to successfully extract the ore deposits, a conventional rotary drilling rig is mounted on the ground. These operations are generally conducted by drilling a pilot hole in a narrow vein followed by a hole widening operation. Initially, a pilot hole is drilled for exploration purposes, to guide the larger diameter hole and to control the trajectory, and the next step in the excavation is progressed by hole widening operation. Drilling cutting properties, such as particle size distribution, volume, and shape may expose a significant drilling problem or may provide justification for performance enhancement decisions. In this study, a laboratory hole widening drilling process performance was evaluated by drilling cutting analysis. Drill-off Tests (DOT) were conducted in the Drilling Technology Laboratory (DTL) by dint of a Small Drilling Simulator (SDS) to generate the drilling parameters and to collect the cuttings. Different drilling operations were assessed based on Rate of Penetration (ROP), Weight on Bit (WOB), Rotation per Minute (RPM), Mechanical Specific Energy (MSE) and Drilling Efficiency (DE). A conducive schedule for achieving the objectives was developed, in addition to cuttings for further interpretation. A comprehensive study for the hole widening operation was conducted by involving intensive drilling cutting analysis, drilling parameters, and drilling performance leading to recommendations for full-scale drilling operations.
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Ghannam, Hanan, Houssam Mourani, and Brian Joseph Schwanitz. "Well Cutting Without Explosives with Multiple Cuts on a Single Run." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206158-ms.
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Abstract Pipe cutting operations are often a critical part of stuck pipe situations, well interventions and plug and abandon operations which all need to remove cut sections of pipe from the well. Unlike traditional ‘blade’ style e-line cutters, which can jam under pipe compression or explosive pipe cutters, which need to dress-over the jagged cut by the rig, a new electric line mechanical cutter's unique design enables performance even if the pipe is under compression, in tension or is neutral. It can also perform multiple cuts in the same run, while creating a clean and machined cut with tool-entry friendly shape. This paper will describe the technology of the new generation cutter, present two case histories; one of multiple cuts of stuck drill pipe, per each run in hole, from Germany and one of a critical tubing cut from a subsea well in Nigeria, using electric wireline and tractor conveyed services for many tasks traditionally performed with coiled tubing in highly deviated wells. These "light vs heavy" solutions can often be done off-line from the rig.
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Antonini, Massimo, Alberto Borboni, Roberto Bussola, and Rodolfo Faglia. "A Genetic Algorithm as Support in the Movement Optimisation of a Redundant Serial Robot." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95123.
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The paper illustrates the application of a genetic algorithm as a methodology to choose and improve the motion law governing the movement of a redundant robot. The subject of this research is an innovative system developed to introduce the laser ray technology in the on-line tube cutting. This technique allows a quality improvement in the pipe-cutting sector, thanks to the various goals. Firstly we underline the improvement of the working environment due to the elimination of cutting noise taking off the tool changing and the steel shaving creation. Secondarily there is a drastic reduction of the cutting cycle time and an improvement of the productivity accomplished by the use of brushless drives and linear motors. In the robot design, particular attention was dedicated to the masses distributions allowing a good natural machine dynamics. The ability of the robot to avoid the cutting object, the demand to maintain the laser torch orthogonal to the cutting surfaces, as well the necessity to impose a velocity behaviour as constant as possible during the cutting operation, suggested the introduction of a redundant degree of freedom. This aspect gives a lot of opportunities in the choose of movements because there are thousands motion profiles for the joints whichever satisfying the conditions imposed to the end-effector path. In this context, we have proposed the idea to combine the procedure to solve the inverse kinematics problem with the contemporaneous optimization of the trajectory. Literature offers a series of algorithms to solve well-known inverse kinematics problem of redundant robot. These are based on the inversion of the matrix representing the link between the end-effector co-ordinates and the joints. The presence of redundancy makes this matrix rectangular and requires the use of the pseudo-inverse matrix to solve the problem in several points of the trajectory. The introduction of some weights, one for each joint co-ordinate, allows to obtain a different distribution of the joint movements computing the pseudo-inverse matrix. If we change these weights in a continuous way in time domain, we can supervise the dynamic behaviors of the machine. The new idea we propose here is the use of an adapted multi-objective genetic algorithm to define a several of particular motion laws reducing vibrations and realizing “special harmonies” in the robot motion. The procedure, that will be completely discussed in the full paper, is actually working on a laser pipe cutting machine. This robot awarded the first prize between two thousand competitor at the EMO MILANO 2003 exhibition.
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Imrie, Andrew, Ashikin Kamaludin, Andrew Hood, and Alistair Agnew. "An Innovative Approach to P&A Barrier Verification and Cement Plug Placement Utilising In-Situ Completion Strings: A Case Study." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21387-ms.
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Abstract Traditional evaluation of behind-casing cement bond quality prior to cement plug placement involves removal, storage, transportation, and disposal of the tubing completion string. This paper presents an innovative approach to verifying cement bond and subsequent cement plug placement. This method involves cutting and retrieving part of the completion string and deploying acoustic logging tools into the casing, followed by using the tubing as a cement stinger. The procedure described in this paper first involves plugging and cutting the tubing, followed by partial retrieval of the completion to expose the abandonment horizon, which may be an impermeable shale or salt layer. A radial cement bond log tool is conveyed on wireline out of the tubing cut in order to evaluate the cement bond behind the exposed casing section. The existing cement sheath is assessed in accordance to a cement evaluation criteria to determine suitability as a barrier. A balanced cement plug is pumped utilising the existing completion string rather than a dedicated stinger. The permanent barrier is then verified appropriately based on satisfying key metrics in the pumping operation before hanging off the completion tubing in-hole and progressing with the rest of the abandonment programme. In the case study presented here, the tool string design considered the need to pass completion restrictions, convey through production tubing, and remain centralised with up to 50-degree deviation. Analysis of cement bond log data indicated that bond quality was good and suitable to place an internal cement plug across the abandonment horizon. This satisfied a minimum of 200-ft coverage across the zone of interest. The existing deep-set mechanical plug placed in the tubing prior to tubing cut was utilised as a base for the cement barrier. A 2,000-ft balanced cement plug was successfully set across the zone of interest. The completion tubing was used as a conduit for cement slurry placement, eliminating the usage of a dedicated work string. At the end of displacement, the tubing string was pulled out of hole safely to approximately 500-ft above the top of the cement with the help of controlled-gel progression properties incorporated in the slurry design. Due to existing completion accessories, setting a through-tubing cement plug and tubing rotation is not an option. Expandable cement was pumped to mitigate natural shrinkage and enhance post-set cement expansion to ensure a competent barrier. The cement job objectives were achieved by meeting the cementation execution criteria with no requirement to wait on cement. This provides additional time saving to the well abandonment. The discussed approach has successfully realised a significant rig-time saving of approximately two days on each well. Going forward, the methodology has effectively been applied to multiple wells across the Southern North Sea (SNS).
Reports on the topic "Cutting-off technology"
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Atkinson, Dan, and Alex Hale, eds. From Source to Sea: ScARF Marine and Maritime Panel Report. Society of Antiquaries of Scotland, September 2012. http://dx.doi.org/10.9750/scarf.09.2012.126.
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The main recommendations of the panel report can be summarised under four headings: 1. From Source to Sea: River systems, from their source to the sea and beyond, should form the focus for research projects, allowing the integration of all archaeological work carried out along their course. Future research should take a holistic view of the marine and maritime historic environment, from inland lakes that feed freshwater river routes, to tidal estuaries and out to the open sea. This view of the landscape/seascape encompasses a very broad range of archaeology and enables connections to be made without the restrictions of geographical or political boundaries. Research strategies, programmes From Source to Sea: ScARF Marine and Maritime Panel Report iii and projects can adopt this approach at multiple levels; from national to site-specific, with the aim of remaining holistic and cross-cutting. 2. Submerged Landscapes: The rising research profile of submerged landscapes has recently been embodied into a European Cooperation in Science and Technology (COST) Action; Submerged Prehistoric Archaeology and Landscapes of the Continental Shelf (SPLASHCOS), with exciting proposals for future research. Future work needs to be integrated with wider initiatives such as this on an international scale. Recent projects have begun to demonstrate the research potential for submerged landscapes in and beyond Scotland, as well as the need to collaborate with industrial partners, in order that commercially-created datasets can be accessed and used. More data is required in order to fully model the changing coastline around Scotland and develop predictive models of site survival. Such work is crucial to understanding life in early prehistoric Scotland, and how the earliest communities responded to a changing environment. 3. Marine & Maritime Historic Landscapes: Scotland’s coastal and intertidal zones and maritime hinterland encompass in-shore islands, trans-continental shipping lanes, ports and harbours, and transport infrastructure to intertidal fish-traps, and define understanding and conceptualisation of the liminal zone between the land and the sea. Due to the pervasive nature of the Marine and Maritime historic landscape, a holistic approach should be taken that incorporates evidence from a variety of sources including commercial and research archaeology, local and national societies, off-shore and onshore commercial development; and including studies derived from, but not limited to history, ethnology, cultural studies, folklore and architecture and involving a wide range of recording techniques ranging from photography, laser imaging, and sonar survey through to more orthodox drawn survey and excavation. 4. Collaboration: As is implicit in all the above, multi-disciplinary, collaborative, and cross-sector approaches are essential in order to ensure the capacity to meet the research challenges of the marine and maritime historic environment. There is a need for collaboration across the heritage sector and beyond, into specific areas of industry, science and the arts. Methods of communication amongst the constituent research individuals, institutions and networks should be developed, and dissemination of research results promoted. The formation of research communities, especially virtual centres of excellence, should be encouraged in order to build capacity.