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이상진(Sang-Jin Lee),박후명(Hoo-Myung Park),이상태(Sang-Tae Lee),하만경(Man-Kyung Ha) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The term 'High Speed Machining' has been used for many years to describe end milling with small diameter tools at high rotational speeds, typically 10,000 - 100,000 rpm. The process was applied in the aerospace industry for the machining of light alloys, notably aluminium. In recent year, however, the mold and die industry has begun to use the technology for the production of components, including those manufactured from hardened tool steels. With increasing cutting speed used in modern machining operation, the thermal aspects of cutting become more and more important. It not only directly influences in rate of tool wear, but also will affect machining precision recognized as thermal expansion and the roughness of the surface finish. Hence, one needs to accurately evaluate the rate of cutting heat generation and temperature distributions on the machining surface. To overcome the heat generation, we used to cutting fluid. Cutting fluid plays a roles in metal cutting process. Mechanically coupled effectiveness of cutting fluids affect to friction coefficient at tool-work-piece interface and cutting temperature and chip control, surface finish, tool wear and form accuracy. Through this study, we examined the behavior of heat generation in high-speed machining and the cooling performance of various cooling methods.
정성용(Sung-Yong Jung),양순철(Sun-Cheul Yang),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
Currently development of Machine tool's technology have been in various gradually and rapidly. So it's also essentially necessary high-speed cutting tool which could endure from high cutting force. However there are some inherent difficulties in general cutting tool which is easy to wear in high speed cutting condition according to high rotational speed. Therefore, we polished tool surface using magnetic polishing technology to reduce friction between tool surface and workpiece. The obtained results from in this study, we can know to exist proper moving type of polishing tool and to be confirm the performance of polished tool in very high speed cutting range(12000 rpm).
CAD/CAM시스템을 이용한 상향식 가공에 의한 고효율가공에 관한 연구
정대훈(Dae Hoon Jeong),한규택(Kyu-Taek Han) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
In this research, the effect of roughing on tool load through bottom-up machining is investigated through actual machining. Generally, through the use of high-speed machining technology, machining methods, such as general roughing, operate by deepening the cutting depth for as long as the tool is able to withstand it, giving a slower feed rate, less cutting depth, and faster feed. However, when the cutting depth is deep, there is a problem in that the stepped shape of the cutting area is increased (e.g., by the shaking of the tool or the chipping load). However, if the cutting is performed less, the cutting time becomes relatively long. To compensate for these drawbacks and extend the service life of the tool, economic efficiency needs to be secured.
볼엔드밀 공구에 의한 사각형상 가공시 공구 휨에 따른 절삭력 특성
김인수(In Soo Kim),김상현(Sang Hyun Kim),이동섭(Dong Sup Lee),왕덕현(Duck Hyun Wang) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.6
Ball end mills used for high-speed and high-precision machining require longer machining time than flat end mills or face cutters, since the tool diameter is limited and the rigidity is reduced by the characteristics of the tool’s cutting edge: at the top end of the tool, the cutting speed approaches zero and hardly removes any material. Because there is little material removal at the top end of the ball end mill, the outer cutting edge performs the majority of the work; this irregular cutting force deforms the tool and shortens its life. In this study, we attached an eddy-current sensor to a tool to measure the deformation from the cutting force and we used a tool dynamometer to measure the cutting force. We found that the change in cutting force is dependent on the change in feed rate during square-shaped processing and, as the feed rate is accelerated, the cutting force also increases. Higher cutting forces increase tool deformation.
고속 가공기를 활용한 비구면 안경렌즈 유리금형용 세라믹코어 가공기술
류근만(Geun-Man Ryu),김효식(Hyo-Sik Kim),김홍택(Hong-Tek Kim),양순철(Sun-Choel Yang),장기수(Ki-Soo Jang),김동익(Dong-Ik Kim),원종호(Jong-Ho Won),김건희(Geon-Hee Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
Ceramic core processing technology using 5-axis high-speed cutting machine is applied to make the glass molds for aspherical ophthalmic lenses. In the technology, optimum processing conditions for aspherical ceramic molds are based on minimal experimental data of surface roughness. Such surface roughness is influenced by fabricating tools, cutting speed, feed rate, and depth of cut, respectively. In this paper, we present that surface roughness and shape accuracy of aspheric ceramic mold obtained by optimum processing conditions are Pa 0.6184㎛ and Pt 5.0301㎛ , respectively, and propose that these values are sufficiently possible to apply to making the glass molds for aspherical ophthalmic lenses.
적외선 열화상 카메라를 이용한 고속가공에서의 열 발생 특성
김흥배,이우영,최성주,유중학 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
The term 'High Speed Machining' has been used for many years to describe end milling with small diameter tools at high rotational speeds, typically 10,000 - 100,000 rpm. The process was applied in the aerospace industry for the machining of light alloys, notably aluminium. In recent year, however, the mold and die industry has begun to use the technology for the production of components, including those manufactured from hardened tool steels. With increasing cutting speed used in modern machining operation, the thermal aspects of cutting become more and more important. It not only directly influences in rate of tool wear, but also will affect machining precision recognized as thermal expansion and the roughness of the surface finish. Hence, one needs to accurately evaluate the rate of cutting heat generation and temperature distributions on the machining surface. To overcome the heat generation, we used to cutting fluid. Cutting fluid play a roles in metal cutting process. Mechanically coupled effectiveness of cutting fluids affect to friction coefficient at tool-work-piece interface and cutting temperature and chip control, surface finish, tool wear and form accuracy. Through this study, we examined the behavior of heat generation in high-speed machining and the cooling performance of various cooling methods.
고속가공에서 박막 측벽(Thin wall) 파트 가공을 위한 연구
김홍배,이우영,최성주 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
The term 'High Speed Machining' has been used for many years to describe end milling with small diameter tools at high rotational speeds, typically 10,000 - 100,000 rpm. The process was applied in the aerospace industry for the machining of light alloys, notably aluminium. In recent years, however, the mold and die industry has begun to use the technology for the production of components, including those manufactured from hardened tool steels. And the end-mill is an important tool in the milling process. A typical examples for the end mill is the milling of pocket and slot in which a lot of material is removed from the workpiece. Therefore the proper selection of cutting parameters for end milling is one of the important factors affecting the cutting cost. The one of the advantages of HSM is cutting thin-wall part of light alloy like Al (thinkness about 0.3㎜). In this paper, firstly, we study characteristics of HSM, and then, we choose the optimal parameters(cutting forces) and investigate various machining strategies to cut thin-wall part by experiment.
김전하,강명창,김정석,나승표,김기태 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
The high hardened materials that are remarkable in aspects of durability have been used for die and mold industry. As the high hardened materials are hard to machine, the high-speed machining is essential to manufacture these materials. Currently, in the general turning and milling, experiments to the tool wear monitoring have studied, but those have not applied in high-speed machining. In this study, the cutting mechanism was analysed by the cutting force according to cutting conditions, and the parameters to monitor the tool wear were selected from the tendency of the cutting force and acceleration according to cutting length in the high-speed machining of the high hardened materials(STD11).
한창규,고성림,서천석,김경배 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
The tool geometry parameters and cutting process have complex relationships. Until now, various cutting test were needed to acquire optimal design of end mill for the purpose of high speed machining, due to the insufficient knowledge about cutting process in high speed machining. Using various tools with different geometry, relationships between tool geometry parameter (rake angle, clearance angle, length of cutter) and cutting process (cutting force, surface accuracy, surface roughness) have been studied. Acquired data can be used to design optimal tool for high speed machining and to develop a software for design of end mill geometry.
볼엔드밀의 고속가공에서 절삭력분석 및 평가에 관한 연구
이춘만(Choon Man Lee),류승표(Seung Pyo Ryu),고태조(Tae Jo Ko),정종윤(Jong Yun Jung),정원지(Won Jee Chung) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.5
High-speed machining is one of the most effective technologies to improve productivity. Because of the high speed and high feed rate, high-speed machining can give great advantages for the machining of dies and molds. This paper describes on the analysis and evaluation of cutting force in high-speed machining. Cutter rotation directions, slope directions, spindle revolution and depth of cut are control factors for cutting force. The effect of the control factors on cutting force is investigated for the high speed machining of STD11.