Relevant bibliographies by topics / Machining burrs

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Machining burrs'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Machining burrs"

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Kizhakken, Vipindas, and Jose Mathew. "Modeling of burr thickness in micro-end milling of Ti6Al4V." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 233, no. 4 (April 28, 2018): 1087–102. http://dx.doi.org/10.1177/0954405418769916.

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Mechanical micro-machining of Ti6Al4V is finding great demand because of its wide range of application in various fields such as communication, optics and biomedical devices. Increasing demands on functioning and performance requires components to be free from burrs after the machining process. Presence of burrs on micro-mechanical parts or features significantly affects quality and proper assembly of the parts. Also in micro-machining, the size of burr is comparable to that of micro-features. Since the formation of burr is inevitable in any machining process, generally the deburring operation is performed to remove burrs. Burr thickness is one of the important parameters which describe the time and method necessary for the deburring operation. Burrs on micro-parts are generally characterized using scanning electron microscope, which is a time-consuming, costly and non-value-added activity. However, a proper mathematical model will help predict burr thickness easily. In this article, a mathematical model to predict burr thickness during micro-end milling of Ti6Al4V is presented. The proposed model was developed based on the principle of continuity of work at the transition from chip formation to burr formation. Ti6Al4V titanium alloy is one of the materials which generates segmented (saw-tooth) chips at low cutting speeds. Hence, initially an appropriate material constitutive model was selected based on better prediction of burr thickness. Then, to reduce the prediction error, machining temperature was evaluated for all experimental conditions and included in the model. From the initial study, it was found that Hyperbolic TANgent material model gives a better prediction compared to Johnson–Cook material model. Later, after including machining temperature into the model it was observed that the prediction error was reduced. The proposed model was validated with the experimental results.
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Zhu, Yun Ming, and Gui Cheng Wang. "Application and Analysis of RBF Neural Network for Burr Prediction in Micro-Machining." Applied Mechanics and Materials 37-38 (November 2010): 171–75. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.171.

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Micro-milling is widely used in material removal processes in industry. However, burrs are often formed on workpiece edges in milling process. Burr effects the dimensional tolerance and performance of the workpiece seriously and is desirable to be controlled. Burrs prediction technology is useful for cutting conditions optimization to control burrs forming. Due to lots of factors influencing the formation process of burr, it is a difficult task to establish the burr size prediction model by mathematical and mechanical method. RBF neural network was used for burr formation predition. Design of the network, network structure parameters determination and generalization capability of the network were analyzed and discussed. Achieved network has good fitting performance and generalization capability validated by experiments.
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Hashimura, M., Y. P. Chang, and David Dornfeld. "Analysis of Burr Formation Mechanism in Orthogonal Cutting." Journal of Manufacturing Science and Engineering 121, no. 1 (February 1, 1999): 1–7. http://dx.doi.org/10.1115/1.2830569.

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To prevent problems caused by burrs in machining, reduction and control of burr size is desirable. This paper presents a basic framework for and conceptual understanding of the burr formation process based upon the material properties of the workpiece. In order to verify this framework and explain the basic phenomena in the burr formation process, the deformation at the edge of the workpiece was analyzed using a finite element method (FEM). Micro-machining tests under an optical microscope and a scanning electron microscope using Al-2024-O material were also done to observe the burr formation process. The feed rate and tool edge radius were varied and the resulting burr formation observed. FEM analysis of burr formation in the 2024 material and observation of the deformation at the workpiece edge in the micro-machining tests verified the proposed conceptual understanding of the burr formation process. For the experimental conditions examined, all of the burrs in Al-2024-O were “negative” burrs, that is, edge breakout. As the feed was increased two effects were observed. One effect was an increase in the resulting burr thickness. Another effect, which was observed during the burr initiation stage while machining with a sharp tool, was an increase in both the distance and depth of the initial pivoting point of the burr from the tool edge.
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Zhu, Yun Ming, Gui Cheng Wang, Zhi Wang, and Shu Tian Fan. "Network Database System for Metal Cutting Burr." Advanced Materials Research 24-25 (September 2007): 7–12. http://dx.doi.org/10.4028/www.scientific.net/amr.24-25.7.

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The formation and existence of burrs is one of the common phenomena in machining. It affects directly machining accuracy and parts quality. Network database system for metal cutting burr is developed using ASP.NET platform. The management of metal cutting burr data, inquiry and prediction of cutting burrs types and sizes, optimization of cutting conditions for controlling burr forming which based on the reasoning method of BP neural networks are realized. The development and realization of network database of metal cutting burr provide a convenient way for data transmission between multi-workshop and across regions, promote the development of burr controlling technology and modern manufacture technology.
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Yang, Cheng, J. Huang, W. Yue, G. F. Shi, and Gui Cheng Wang. "Prediction of Cutting-Direction Burr Height in Micro-Milling." Applied Mechanics and Materials 684 (October 2014): 131–36. http://dx.doi.org/10.4028/www.scientific.net/amm.684.131.

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Due to the high precision and strong molding capacity, micro-milling plays an important role in the field of micro-machining. The components machined in micro-machining is smaller than conventional components, and sometimes the generated burrs are as large as the feature size of components, so the study of micro burr control is very important. In the reseach, cutting-direction burrs are based on the traditional milling characteristics, also combined with the characteristics of micro-milling. The experimental data verify the correctness of the model well, so it provides theoretical guidance for the burrs control in micro-milling.
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Shen, Qin Xi, Gui Cheng Wang, Yun Ming Zhu, and Hai Jun Qu. "Transformation of Cutting Burr/Fracture in High-Speed Machining Al Alloy." Advanced Materials Research 53-54 (July 2008): 101–7. http://dx.doi.org/10.4028/www.scientific.net/amr.53-54.101.

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The metal cutting burr is one of the factors that influence the edge quality and performance of precision parts.A finite element model has been established to investigate the mechanism of burr formation and limit transformation in high-speed machining 2024Aluminum alloy .The burr/fracture formation process is simulated with elastic-plastic nonlinear element method based on ABAQUS.This paper has investigated the mechanism of burr /fracture formation and the limit transformation condition of cutting-direction burrs and fractures in high-speed machining and the limit transformation condition change with the cutting condition,which lay scientific basis of further research on cutting burrs formation and its minimization and deburring technology.
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Wang, Qing Hua, Dong Hua Deng, and Bo Huang. "Experimental Study on 3-Phase Abrasive Waterjet Deburring." Advanced Materials Research 411 (November 2011): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amr.411.335.

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Burrs are unnecessary by-products produced by cutting metal in a machining process. It greatly affects product quality and assembly efficiency, and also affects product cost. Therefore, burrs must be removed and the surface quality must be maintained. Contrary to abrasive waterjet, 3-phase abrasive waterjet has same machining effect on a workpiece without an additional equipment to meet its circulatory requirement. An experiment was performed to analyze the effect of the 3-phase abrasive waterjet parameters on burr removal and surface quality.
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Jo, S. R., S. L. Ko, and Yuri M. Baron. "Effective Deburring of the Burr at Intersecting Hole by Permanent Magnet Inductor." Advanced Materials Research 24-25 (September 2007): 29–38. http://dx.doi.org/10.4028/www.scientific.net/amr.24-25.29.

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The sharp burrs produced by plastic deformation during machining of the precision components deteriorates the precision and performance of a machine. Thus, effective removal of the burrs may improve productivity and performance of the machinery. This study was conducted based on the experiment to remove fine burrs produced during machining process using the magnetic abrasive finishing method. The magnetic abrasive finishing using the abrasive feature of an abrasive and the magnetic nature of iron is an abrasive method to brush the burrs with iron powder that has a cohesive power due to the line of induction. The purpose of this study is to remove the burrs at intersecting holes which are difficult to access with tools, using the magnetic abrasive finishing method. Special tool is designed for deburring micro burr at intersecting holes. To find the proper deburring condition, gap distance, rotational speed of inductor, components of powder and effect of coolant are analyzed.
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Sun, Shu Feng, An Chen Yin, Ping Ping Wang, and Qin Dong Zhang. "Experimental Study of Micro Milling Burr Control Based on Process Parameters Optimization." Applied Mechanics and Materials 551 (May 2014): 569–73. http://dx.doi.org/10.4028/www.scientific.net/amm.551.569.

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With the development of the times, micro and small products are needed increasingly. The machining accuracy and surface quality are especially important to micro machining. However, in the micro milling, the size of the burr compared with that of the part is much greater than that of conventional milling. Moreover, it is difficult to remove micro milling burr by conventional deburring methods due to the small part size. The existence of burr will not only affect the match of parts, but also reduce the dimensional accuracy and surface quality of the work piece. Therefore, it is important to control and reduce micro-milling burr. Micro-milling experiments are carried out on the material of copper with micro-milling cutter diameter 0.5 mm. Micro grooves are milled with different cutting process parameters. The burrs generated under different conditions are analyzed using orthogonal test method. When the spindle speed and feed rate are constant, burrs increase with the increasing of cutting depth. Keeping the spindle speed and the depth of cut constant, burrs are generated increasingly with the increase of feed rate. And the decreasing of the spindle speed leads to the increase of burrs if the other parameters are constant. The experimental research provides reference for the burr control of micro-milling based on the optimization cutting process parameters.
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Zhang, Peng, Xing Yu Guo, Shao Fu Shan, and Chen Ge Wu. "Study on Vibration Grinding Deburring Finishing Process." Advanced Materials Research 211-212 (February 2011): 634–37. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.634.

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It is difficult to remove for burr, especially for micro-hole burr, so the vibration grinding process is put forward and adopted to remove burrs. The mechanism of vibration grinding deburring is analyzed, and the experiments of micro-hole deburring are done with the technology of vibration grinding. From the results of the experiments, the conclusion can be draw that this technology can remove the burrs effectively. The vibration grinding process has the features of simple process system, low cost, easy operating. The Vibration grinding process technology method can also be used to remove burrs of other machining process. It has more application value in practice.
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Dissertations / Theses on the topic "Machining burrs"

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Cococcetta, Nicholas Michael. "Investigating Surface Finish, Burr Formation and Tool Wear During Sustainable Machining of 3D Printed Carbon Fiber Reinforced Polymer (CFRP) Composites." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1586533608277002.

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Hou, Chih-Chun, and 侯至純. "The Research on Machining Burr Improvement Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/16972747118487240299.

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碩士
國立中正大學
機械工程學系暨研究所
99
Machinging process is the common method in current processing method. When cutting metal, there is always with burr in workpiece edges, therefor; how to reduce machinging-burr in cutting process is a very important issue. In most burr reducing method is using post-processing, but because of some limitation of cutting tool and workpiece geometry, in some cases it is not suitable. In addition, the post-processing may cause the workpiece edge imperfect, rising the machinging cost, and increasing the machinging time. The main purpose of this paper is to reduce the machinging burr by one time process. This research reduces maching burrs by a special cutting path planning, which came from the related literature reviews and theories. This includes changing the order of cutting step to remove the Side-Burr and Top-Burr, and the planar Exit-burr reduction method to plan each machinging plane.Finally, by comparing the traditional cutting path with our purposed burr-reduction cutting path, this research presents the advantages of our approach.
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廖韋勛. "A Study on the Enhancement of Burr of Composite during Machining Process." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/66810188666861347758.

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碩士
逢甲大學
機械與電腦輔助工程學系
102
The purpose of this study is improve the burr issue during composite CNC machining process. The burr issue will impact feature dimension that machining by CNC process and it need to be remove by after process, this requirement will increase the production cost. Use the Taguchi method to discuss effect of machining quality in difference parameters(EX. cut direction, spindle speed, feed rate, rake angle of tool, hardness of flexible supporter, thickness of flexible supporter) According to the result of Taguchi&;#39;s L18 orthogonal array, analysis of variation (ANOVA).The optimal machining parameters were combination of up milling(Factor A), spindle speed 9000rpm(Factor B), feed rate 100mm/min(Factor C), rake angle of tool 14°(Factor D), hardness of supporter Shore A 95(Factor E), thickness of supporter 0.3mm(Factor F). And the factor A, B, D, E are important control factor for machining quality. The Factor C, F only slightly effect for machining quality and can be apply to reduce production cost. After optimal parameter implement, the average of burr dimension could be reduce from 0.7mm to 0.07mm and it will improve CNC machining quality and dimension issue.
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LAI, GUAN-WEI, and 賴冠維. "The Burr Quality Analysis for the Tempered Glass of Ultrasonic Assisted Machining." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/7t85b7.

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碩士
國立聯合大學
機械工程學系碩士班
104
In this study, the use of ultrasonic vibration assisted machining of tempered glass (25 hardened layer) were slotting and explore burrs quality of the machined surface. Use Taguchi method to find the optimal combination of parameters to improve machining quality. The control factors include: tool grain (A), feed rate (B), spindle speed (C) and amplitude (D), there are three levels of each factor. This study is used the L9(34) orthogonal table, signal noise, and analysis of variance. The each control factors correspondence machining affect and contribution was disused. The results show that optimization parameters are A2B1C3D3, and the influence factors on the contribution of C>A >B>D.
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Book chapters on the topic "Machining burrs"

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Biermann, D., and M. Heilmann. "Burr Minimization Strategies in Machining Operations." In Burrs - Analysis, Control and Removal, 13–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00568-8_2.

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Dornfeld, D., and S. Min. "A Review of Burr Formation in Machining." In Burrs - Analysis, Control and Removal, 3–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00568-8_1.

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Uhlmann, E., V. Mihotovic, H. Szulczynski, and M. Kretzschmar. "Developing a Process Model for Abrasive Flow Machining." In Burrs - Analysis, Control and Removal, 73–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00568-8_8.

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Wang, Gui Cheng, Chun Yan Zhang, Hong Jie Pei, Yun Ming Zhu, and Li Jie Ma. "Formation and Control of Feed Direction Burrs in Machining." In Materials Science Forum, 580–83. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-421-9.580.

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Wang, G. L., Xu Dong Pan, D. X. Shao, and Ze Sheng Lu. "Study on Non-Burr & Sharp-Edge Protecting Grinding Method of Functional Edge." In Advances in Machining & Manufacturing Technology VIII, 249–53. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.249.

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Groppetti, R., and M. Monno. "A Contribution to the Study of Burr Formation in Hydro Abrasive Jet Machining." In Jet Cutting Technology, 621–33. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2678-6_41.

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Yaich, M., Y. Ayed, Z. Bouaziz, and G. Germain. "A 3D Numerical Analysis of the Chip Segmentation Mechanism and the Side Burr Formation During the Ti6Al4V Alloy Machining." In Lecture Notes in Mechanical Engineering, 671–80. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-27146-6_73.

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Niknam, Seyed Ali, Yasser Zedan, and Victor Songmene. "Machining Burrs Formation & Deburring of Aluminium Alloys." In Light Metal Alloys Applications. InTech, 2014. http://dx.doi.org/10.5772/58361.

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Tolouei-Rad, Majid, and Muhammad Aamir. "Analysis of the Performance of Drilling Operations for Improving Productivity." In Drilling Technology. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96497.

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Drilling is a vital machining process for many industries. Automotive and aerospace industries are among those industries which produce millions of holes where productivity, quality, and precision of drilled holes plays a vital role in their success. Therefore, a proper selection of machine tools and equipment, cutting tools and parameters is detrimental in achieving the required dimensional accuracy and surface roughness. This subsequently helps industries achieving success and improving the service life of their products. This chapter provides an introduction to the drilling process in manufacturing industries which helps improve the quality and productivity of drilling operations on metallic materials. It explains the advantages of using multi-spindle heads to improve the productivity and quality of drilled holes. An analysis of the holes produced by a multi-spindle head on aluminum alloys Al2024, Al6061, and Al5083 is presented in comparison to traditional single shot drilling. Also the effects of using uncoated carbide and high speed steel tools for producing high-quality holes in the formation of built-up edges and burrs are investigated and discussed.
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Choudhury, I. A., and S. A. Lawal. "Burr Formation in Machining Processes." In Comprehensive Materials Processing, 283–95. Elsevier, 2014. http://dx.doi.org/10.1016/b978-0-08-096532-1.01117-1.

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Conference papers on the topic "Machining burrs"

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Niknam, Seyed Ali, Azziz Tiabi, Imed Zaghbani, Rene Kamguem, and Victor Songmene. "Milling Burr Size Estimation Using Acoustic Emission and Cutting Forces." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63824.

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Burr formation is one of the main concerns usually faced by machining industries. Its presence leads to additional part edge finishing operations that are costly and time consuming. Burrs must be removed as they are source of dimensional errors, jamming and misalignment during assembly. In many cases burrs may injure workers during handling of machined part. Due to burr effect on machined part quality, manufacturing costs and productivity, more focus has been given to burr measurement/estimation methods. Large number of burr measurement methods has been introduced according to various criteria. The selection of appropriate burr size estimation method depends on number of factors such as desired level of quality and requested measuring accuracy. Traditional burr measurement methods are very time consuming and costly. This article aims to present empirical models using acoustic emission (AE) and cutting forces signals to predict entrance and exit burrs size in slot milling operation. These models can help estimating the burrs size without having to measure them. The machining tests were carried on Al 7075-T6 aluminum alloy using 3 levels of cutting speed, 3 levels of feed rate, 3 levels of cutting tool coating and 2 levels of depth of cut. Mathematical models were developed based on most sensitive AE parameters following statistical analysis, cutting forces and their interaction on predicting the entrance and exit burrs size. The proposed models correlate very well with the measured burrs size data.
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Niknam, Seyed Ali, and Victor Songmene. "Experimental Investigation and Modeling of Milling Burrs." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1176.

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The burr formation is one of the most common and undesirable phenomenon occurring in machining operations which reduces assembly and machined part quality. Therefore, it is desired to eliminate the burrs or reduce the effort required to remove them. This paper presents the results of an experimental study and describe the influence of cutting parameters on slot milling burrs, namely top burrs and exit burrs. Statistical methods are also used to determine the controllability of each burr. A computational model is then proposed to predict the exit up milling side burr thickness based on cutting parameters and material properties such as yield strength and specific cutting force coefficient that are the only unknown variables in the model. The proposed computational model is validated using experimental results obtained during slot milling of 2024-T351 and 6061-T6 aluminium alloys.
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Zhu, Yunming, Guicheng Wang, Pingkuan Zhang, Lijie Ma, and Chunyan Zhang. "A Study on Burr Formation and Controlling Technology in Precision or Ultra-Precision Drilling." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21489.

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Burr formation is a common phenomena in metal cutting. The burr not only effect precision of parts directly but influence the assembly quality badly. Therefore, the control and deburring technology of machining burrs has become one of the key problem in precision or ultra-precision and automatic procession. In traditional drilling, the exit burr is bigger than the entrance burr, and its hazard is more larger. Moreover deburring process is very complex. According to these status quo, a new method of active control of the exit burr is put forward using vibration drilling. Mechanism of chip broken and burr formation in vibration drilling are analysed systematically and an equipment of vibration drilling is developed based on drilling experiment. Cutting test on A3 material, brass (H62) and 1Cr18Ni9Ti stainless steel is carried out using the method of vibration drilling. As a result, cutting character is improved because of the using of this method. Also, machining accuracy and surface integrality of parts are improved remarkably and the size of the exit burr is controlled effectively in vibration drilling. The development of vibration drilling device provides a new approach for the progress of ultra-precision drilling technology. Vibration drilling device and technology developed in this study can be widely used to ultra-precision machining.
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Yamashita, Shinnosuke, Tatsuya Furuki, Hiroyuki Kousaka, Toshiki Hirogaki, Eiichi Aoyama, Kiyofumi Inaba, and Kazuna Fujiwara. "Development of the cBN Electroplated End-Mill for High Precision Machining of CFRP." In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8604.

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Abstract Recently, the demand of carbon fiber reinforced plastics (CFRP) has been rapidly increased in various fields. In most cases, CFRP products requires a finish machining like cutting or grinding. In the case of an end-milling, burrs and uncut fibers are easy to occur. On the other hand, a precise machined surface and edge will be able to obtain by using the grinding tool. Therefore, this research has been developed a novel the cBN electroplated end-mill that combined end-mill and grinding tool. In this report, the effectiveness of developed tool was investigated. First, the developed tool cut the CFRP with side milling. As the result, the cBN abrasives that were fixed on the outer surface of developed tool did not drop out. Next, the end-milled surface of CFRP was ground with the developed tool under several grinding conditions based on the Design of Experiment. Consequently, the optimum grinding condition that can obtain the sharp edge which does not have burrs and uncut fibers was found. However, surface roughness was not good enough. Thus, an oscillating grinding was applied. In addition, the theoretical surface roughness formula in case using the developed tool was formularized. As the result, the required surface roughness in the airplane field was obtained.
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Hu, Haiyan, Jiandong Yang, Chunlin Tian, and Hui Peng. "Research on Machining Technology for Fatigue Fracture of Burrs on Cross-Drilled Holes of Master Cylinder." In 2018 International Conference on Virtual Reality and Intelligent Systems (ICVRIS). IEEE, 2018. http://dx.doi.org/10.1109/icvris.2018.00062.

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Sweet, E. Jack, and J. Terence Feeley. "Laser: A Gas Turbine Combustor Manufacturing Tool." In ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/88-gt-267.

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Coordination of the latest manufacturing technologies to improve aircraft gas turbine combustor design has resulted in developing processes for machining and welding of combustor liners with laser. Major concerns were the cutting and drilling of chrome nickel alloys and ceramics to result in precise sizing with minimal or no burrs or slag which, if they existed, would disrupt airflow patterns, and welding which would neither contribute to distortion nor leave built-in cracks to propagate in fatigue loading. Laser machining has met these criteria with results superior to those of conventional punching, drilling, and welding techniques.
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Wang, Y. Q., L. S. Han, H. B. Liu, K. Li, and Y. Ma. "Effect of Cryogenic Conditions on the Drilling Performance of Carbon-Carbon (C-C) Composites." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2737.

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C-C composite is a kind of typical difficult-to-machine materials due to its high hardness, high strength, and obvious anisotropy features. But, water-based or oil-based coolant cannot be used during its machining process. As a result, the machining defects, including burrs, orifice ripping, and interlayer delamination, are always unavoidable. In this article, taking the liquid nitrogen as coolant, C-C composite cryogenic drilling is researched experimentally. Taking the way of LN2 external spray cooling, a series of cryogenic drilling experiments were designed. Comparing with dry drilling, the thrust force was reduced, the machining defects were significantly inhibited, and a better roundness of holes was achieved in cryogenic drilling. It indicates that cryogenic condition has a positive effect on improving the C-C composite drilling quality.
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Panigrahi, Dillip Kumar, and Mihir Sarangi. "Fabrication of Deterministic Micro-Asperities on Thrust Surfaces Using Photo Chemical Machining." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2955.

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Abstract The present invention relates to characterization and the sequence of operations in photo chemical machining as a means to fabricate positive deterministic micro-textures on mild steel thrust pad surfaces. Fabrication of surface micro-texture by current technique is conceived in two-stages: where photographic emulsion process is used to pattern the microstructure, and chemical etching method is employed to fabricate the textures on mild steel surface by dissolving exposed metal surface. The texture fabricated by present invention is having slightly rough etched bottom surface with sharp edge and least amount of burrs around the texture rim and the process is also cost effective. Several aspects regarding sequence of operations in manufacturing process and the characterization of fabricated textured surfaces are discussed. The physical significance of micro-asperities on hydrodynamic lubrication is presented experimentally under constant flow system. The variation of hydrodynamic performance parameters such as frictional torque, fluid film thickness and recess pressure with different operating conditions such as varying speed and supply pressure are outlined.
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Nguyen, Thanh-Qua, Jeongmin Mah, Woo-Tae Park, and Sangyoup Lee. "Rapid and Versatile Micromold Fabrication Using Micromilling and Nanopolishing for Microfluidic Devices." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5398.

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Abstract In an effort to make microfluidic research more attractive and cost-effective, micromilled polymethyl methacrylate (PMMA) has gained interests as an alternative method to the conventional cleanroom-based micromolds fabrication technologies. The most enabling aspects of micromilling are flexibility on the design changes and the ability to fabricate three-dimensional structures. However, the major drawback of micromilling based micromold fabrication is the presence of burrs and tool marks on the surface after machining. High surface roughness on replicated polymer results in poor bonding strength and optical clarity. The roughness of micromilled surface strongly depends on the machining parameters such as tool size, spindle speed, feed rate, width of cut, and depth of cut. Thus, it is crucial to optimize the machining parameters to obtain a good surface finish. Although the optimal fabrication parameters are used to machine the micromold, the surface roughness of micromilled mold is still relative high compared to the surface of unprocessed PMMA. In this paper, we first optimize the micromilling parameters of Computer Numerical Control (CNC) milling machine to achieve the best possible of surface roughness. We have optimized the machining parameters for a flat endmill with 100 μm, 200 μm, and 400 μm in diameter of spindle speed, feed rate, width of cut, and the depth of cut respectively at 18000 rpm, 20 mm/min, 30 μm, and 20 μm. Then, a method to polish the structured surface of the micromilled mold was developed using the rotary magnetic field. By modifying the CNC program language G-code, we were able to control the polishing path, polishing force and time precisely. Consequently, the burrs and tool marks are completely removed, such that the roughness of the surface is decreased from 350 nm Ra to 30 nm Ra, and 1200 nm Rz to 300 nm Rz while the profile of microstructures is not deteriorated. Finally, we demonstrate our mold fabrication scheme by building a microfluidic immunoassay device with four Quake’s valves and showed the sequential assay process successfully.
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10

Nanlawala, Michael, and Ali Manesh. "Robotic Deburring of Precision Gears." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/ptg-14420.

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Abstract Machining processes such as milling, drilling, turning, hobbing or gear teeth cutting create burrs on the edges of metal parts when the cutting tool pushes material over an edge, instead of cutting cleanly through the material. The size, shape and characteristics of the resulting burrs depend upon a number of process factors such as: tool material and its hardness, tool sharpness, tool geometry, cutting forces, ductility of the material being machined, speed and feed of the cutting tool, and depth of the cut. Except for the turning operation, a subsequent deburring operation is often required to remove the “loose” burrs and also to produce a chamfer to “break” or smooth the edges of the machined part. Gears, in general are deburred manually or by simple mechanical equipment such as Redin™ Deburring Machine. Because of the complexity and/or specific chamfering requirements of aerospace gears, most of these gears have to be deburred manually. In general, manual deburring is a very labor intensive process. Poor quality resulting from inconsistent manual operation, health, safety and environmental related issues, and high turnover of operators incur indirect cost as well. The “Redin Deburring Machines”, however, lack the dexterity and the programmability, which are essential to meet the specific chamfering needs of usually complex shaped aerospace gears. Automating the deburring process can therefore result in significant cost reduction, improved productivity, and improved quality of deburred edges. Mainly because of these reasons, there has been industry wide demand to replace manual deburring by more efficient, reliable and safer automated deburring system.
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