旋削加工에서의 Burrs의 生成原因과 特性에 관한 硏究

鄭在康 조선대학교 생산기술연구소 1982 生産技術硏究 Vol.1982 No.-

The mechanisms causing machining burrs and two typical analistical models that predict burr properties are presented. The experimental study has been made to prevent the burrs produced on workpiece edges in turning operations. The effect and correlations between cutting conditions and burr sizes, and a mechanism of burr formation are discussed. The experimental results obtained are as follows; 1) The deformation of a workpiece edge by cutting force causes burrs. And there are two type of burrs, large size burrs and extremely small size burrs. 2) Small size burrs are produced at large depth of cut, small feed rate, large nose radius and small side cutting edge angle. 3) Brittle materials easily produce the small size burrs and ductile materials easily produce the large size burrs.

Simulation and experiment study of burrs in micro-milling Zr-based metallic glass

Jiachun Wang,Zhenhong Zhang,Chuang Zhang,Jiabin Fu,Jianchao Chen 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.7

Metallic glass has been widely used in making micro parts and equipment due to its excellent physical and chemical performance. A large quantity of burrs is produced in the micro-milling process that is hard to remove and seriously affects the quality and precision of the parts. Burrs should be effectively restrained; however, the burrs’ type, position and the effect of milling parameters on burrs’ generation in micro-milling metallic glass have not been systematically studied. In this paper, by using 3-D FEM simulation and taking micro-milling experiments of Zr-based metallic glass (Vit1), the burrs in flat-end milling and ball-end milling micro grooves were investigated. The burrs’ type and position were observed and summarized, the formation process of various burrs was analyzed in detail, and the influence of cutting parameters on burrs was clarified. Comparing the simulation and experiment result, we could confirm that the top burr and the entrance burr were produced during the processing of the flatend milling cutter, and ball-end milling cutter effectively inhibits the production of the top burr but takes no actions on burrs’ generation at the entrance and the bottom of the groove. The main cause of the top burr is the extrusion of the tool, and the extrusion of the cutting layer metal and chip accumulation were the main reason for entrance and exit burrs. Reducing the axial cutting depth could effectively restrain the generation of burrs for both two kinds of milling tools.

Burr Measurement Method Based on Burr Surface Area

Erkan Bahçe,Burak Özdemir 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.4

One of the major issues of drilling operations pertains to the formation of burrs, which greatly influences the accuracy of the manufactured parts, and, thus, the capability to meet the desired performance of the part. To remove or prevent these burrs, their geometry must be measured accurately, even though they are sharp and irregular in shape. The accurate measurement of the geometry of a burr will lead to the development of a proper deburring method. In this work, the authors describe a simple and convenient new measurement technique for drilling burr profiles and a developed drilling burr measurement system based on surface area. The new method presented in this research aims at providing a comparative evaluation of the height, arc length and area of the burr, as well as its geometrical characteristics. When the average height and arc length measurement methods are compared with the area measurement method, large deviations in burr height are detected. In particular, these deviations increase more in non-uniform burrs. In the measurement of burr size, the new developed method is based on area measurement and is carried out using a computer. Therefore, there is no deviation between the measurements. In contrast, the average deviation ranges for the height and arc length measurement methods are found to be 9.94–48.14% and 6.07–18.82%, respectively.

Copper 박막의 레이저 미세홀 가공시 버 생성에 관한 연구

오재용(J. Y. Oh),신보성(B. S. Shin) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월

The burr of micro drilling and micro cutting on thin metal film is a major obstacle to mass production for micro PCB boards in micro technologies of personal computing and telecom explosion. As the burr affects on the assembling process, it is necessary to study continuously on control or elimination of the burr. In order to get higher valued products, it is also needed to competitive techniques with the high resolution. In this paper, we studied experimentally the burr generation that when it is processed on the copper foil by laser in micro-hole machining Unlike mechanical machining, the burr produced on substrate is a resultants of melt and re-solidification of a melten metal which was heated and treated and treated by laser. And higher laser energy increases the size of burr. Therefor in micro-drilling with laser, it is difficult to reduce the effects of burr for very thin metal sheets. We investigated the state of the burr and analyzed the laser ablation Cu micro machining with respect to laser intensity and processing time.

Burr Control in Meso-Punching Process

Shin Hong Gue,Shin Yong Seung,Kim Byeong Hee,Kim Heon Young The Korean Society of Mechanical Engineers 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.4

The shearing process for the sheet metal is normally used in the precision elements such as semi-conductor components. In these precision elements, the burr formation brings a bad effect on the system assembly and demands the additional de-burring process, so this imposes high cost on manufacturing. In this paper, we have developed the in-situ auto-aligning precision meso-punching system to investigate the burr formation mechanism and ultimately minimize burr. Firstly, we introduced the punch-die contact sensing method to align the punch and the die at initial state prior to the punching process. Secondly, by using the low-price semi-con­ductor laser, burr formed on the edges is measured intermittently during the punching process. We could, finally, make burr on the sheet metal uniformized and minimized by controlling of the precision X - Y table, $1\;{\mu}m$ resolution, and measuring burr height by semiconductor laser. Experimental results show the validity of our system for pursuing the burr-free punched elements.

Effect of burrs on the friction performance of hierarchical micro-dimple textured AISI 1045 steel

박건철,Saood Ali,Rendi Kurniawan,Tae Jo Ko 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.12

One of the common problems associated with surface texturing is the presence of burrs/bulges around a micro-dimple surface. This study experimentally investigates the effect of micro-dimples with burrs on the friction properties of the textured surfaces. Textured surfaces were generated using a two-modulation 3D elliptical vibration texturing method on an AISI 1045 cylindrical steel specimen. Tribological tests were conducted with a block-on-ring configuration at a constant load of 50 N under transition state between mixed lubrication and hydrodynamic lubrication regime. The results indicate that the increase in texture density adversely affects the friction properties of the micro-dimples with burrs. This is attributed to the higher metal-to-metal contact between the sliding surfaces owing to the presence of burrs. Smaller micro-dimples with specific height of burrs (3.7 ± 1.093 μm) show reduced friction characteristics, especially in the high-sliding-speed regions. The results suggest that the small micro-dimples with low texture density were effective in reducing the friction of the textured surfaces with the specific height of burrs around the micro-dimples. Additionally, oxidation wear was discovered in the non-textured surface after frictional tests.

디스플레이 산업의 프레스 가공에서 Burr를 제거하기 위한 Six Sigma 방법론

한용권 ( Yong Kwon Han ),박상철 ( Sang Chul Park ) 대한설비관리학회 2011 대한설비관리학회지 Vol.16 No.2

Presented in the paper is a methodology to remove burrs from parts produced by press machines. Burrs of press parts can cause various problems such as the dimensional quality of the part and even the safety of operators. This paper employs the six sigma methodology to accomplish the objective, burr free products. To find the source of the burr, we identify seven potential factors; clearance, material properties, punch wear, skill levels of operators, champer difference of C & R type, vibration of C-type press, and lubrication oil. Through an extensive experiments, we extract three key factors; clearance, punch wear and champer difference of C & R type. For the three key factors, we propose an optimization method and the result is very positive.

비정규 분포 특성을 갖는 공정에서 극소 불량률 관리를 위한 Burr_ZP관리도 설계

최성원 ( Seong-won Choi ),김창수 ( Chang-soo Kim ) 대한설비관리학회 2020 대한설비관리학회지 Vol.25 No.1

Along with the development of various engineering technologies, the recent manufacturing technology and statistical quality control technology have made much progress. Statistical quality management technology is being researched to maintain and manage the quality of parts per million (PPM) level to satisfy the needs of customers. Among them, control chart is a technique to monitor the variation of various quality parameters. In particular, the defective rate control chart for monitoring fraction of nonconforming has a problem in that too many samples are required when fraction of nonconforming decreases to the PPM level. To solve this problem, there are various methods such as acceptance control chart, but it also has a limitation that it can be used only when the quality parameter is normally distributed. In this paper, we propose a method to manage the minimum defect rate of PPM level in the process where the quality parameter has non-normal distribution characteristics. First, we apply the Z_P statistic that can represent the minimum defect rate with a small number of samples. Also, Burr_ZP distribution is suggested by using Burr distribution that can fit most single-probability distribution. And Burr_ZP distribution is used to show the performance of Burr_ZP control chart using 3 sigma control chart method.

Design of a deburring tool for intersecting holes in aluminum alloys

Cho, Chang-Hee,Kim, Kwon-Hee Elsevier 2012 Journal of materials processing technology Vol.212 No.5

<P><B>Abstract</B></P><P>A deburring tool for intersecting holes is proposed. The tool has a hemispherical cutter head mounted on a pivoted shaft which is loaded against the burr edge by a set of springs. The cutter head is inserted into an intersecting hole up to the burr edge and is subsequently rotated counterclockwise with a return stroke. The cutter head size is selected such that the cutter head has maximum accessibility to the three dimensional burr edge. The cutting edge is designed to maintain proper ranges of rake angle and relief angle during deburring. The efficiency of the tool in terms of deburring speed is verified by a set of deburring tests on Al6061-T6. The measured depth of cut on the burr edge confirms the complete removal of burrs.</P>

구멍가공 시 경사진 출구면에 발생한 버의 효율적 제거를 위한 디버링 공구의 공구경사각과 강성의 결정

배준경(Jun-Kyung Bae),신성근(Sung-guen Shin),권병찬(Byeong-chan Kwon),고성림(Sung-Lim Ko) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.6

In machining operations, a burr is an undesirable material formed by plastic deformation in a workpiece. With the ongoing industrial developments, it has become an important issue to efficiently remove burrs. Several deburring methods have been developed to remove specific burrs that require special machining. However, to remove burrs formed while machining at the CNC machining center, deburring tools must be developed. In a previous study, a new deburring tool was developed by the authors. In this study, the influence of the rake angle and stiffness of the new deburring tool was analyzed to improve performance. The theoretical model was driven considering the rake angle and stiffness, and experiments were carried out to validate the model. Especially, conditions based on the designed rake angle and stiffness to effectively remove burrs, which is difficult, at the exit surface were suggested.