• Title/Summary/Keyword: high precision machining

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A Study on th High Speed Machining Evaluation Method through Shape Machining (형상가공을 통한 고속가공 시스템 평가방법에 관한 연구)

  • 손덕수;유중학;최성주;이우영
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.992-995
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    • 2001
  • Several evaluation methods of conventional machine tools have been proposed by KS and ISO. Even though the accuracy of the tools can be evaluated with those methods, there are still no proper evaluation method of high sped machining. Because it is hard to evaluate characteristics of high speed machining such as decrease of cutting temperature, cutting force, and reduced machining time. Therefore, new evaluation method for high speed machine should be developed. In this paper, several shape of model have been proposed to evaluate cutting accuracy of high speed machine.

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Machining characteristic of gray cast iron in high speed machining with tungsten carbide endmill (초경 엔드밀에 의한 회주철(GC250)의 고속가공 특성(1))

    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.147-150
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    • 1995
  • High speed machining one of the most effectiv to improve machining accuracy and product in dies and mould. But a study on this is limited to Alumium, light metal etc. This paper presents machining characteristic of gray cast iron in high speed machining with tungsten carbide endmill. It is suggested to measure sutting force, tool wear, surface roughness, surface shape and select of cptimal cutting condition in the high speed machining of gray cast iron. Performance of high speed machine tool was estimated and the relationship between cutting phenomenon and machinabillity was described.

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The Machining Technique of Connecting Rod through Constant Control of Cutting Speed Method in Ball End Mill Machining (볼엔드밀 가공에서 절삭속도 일정제어기법에 의한 커넥팅로드 가공기술)

  • Kang, Myung-Chang;Jung, Young-Ho;Kim, Jeong-Suk;Moon, Sung-Jun;Kim, Kyung-Kyoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.6
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    • pp.1053-1059
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    • 2002
  • The purpose of this study is to suggest how the machining technique of constant control of cutting speed can improve precision machining and tool life in high speed machining using a ball end mill. Cutting speed is changed in machining fee form surfaces such as connecting rod die. So, we don't have supreme surface form and tool life on machining. To solve this problem we should settle on optimal cutting speeds in free form surface machining. And, to improve precision machining, We must execute high speed machining methods to output optimum NC data using developed constant control of cutting speed program after modeling by CAD/CAM. In this paper, a comparison was made of the cutting precision and tool life in conventional cutting and those in connecting rod machining applying the program developed.

A Study on Transition of Dimension Error and Surface Precision in High Speed Machining of Al-alloy (Al 합금의 고속가공에서 치수오차와 표면정도 추이고찰)

  • 정문섭
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.9 no.3
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    • pp.96-102
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    • 2000
  • High speed machining aims to raise the productivity and efficiency by making more precise and higher value-added products than any other machining method by means of the high speediness of spindle and feed drive system. The purpose of this study is to investigate the effects of the run-out of endmill on the dimension precision of workpiece and to obtain the fundamental data on high speed machining which is available by machining the side of Al-alloy with solid carbide endmills in high speed machining center and by measuring dimensions and surface roughness. From the results of experimentation following are obtained ; if spindle speed is ultra high in conditions that radial depth of cut and feed per tooth are very small highly precise and accurate products are to be made efficiently with high feed rate. and so we can raise productivity.

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A study on the Analysis and Evaluation of Cutting forces for High Speed Machining by a Ball-end mill (볼엔드밀의 고속가공에서 절삭력 분석 및 평가에 관한 연구)

  • Lee Choon Man;Ryu Seung Pyo;Ko Tae Jo;Jung Jong Yun;Chung Won Jee
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.5 s.170
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    • pp.167-174
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    • 2005
  • 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.

Micro-groove Cutting Experiments using Micro-Machining System (미세가공 시스템을 이용한 미세 그루브 가공실험)

  • 이선우;이동주;이응숙;제태진
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.263-268
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    • 2001
  • The needs for precision machining of micro to milli parts have been increased as the industry require high quality products, especially for the micro-machining of IT products. The ultra-precision machining system is essential for the micro machining of fine structures, which insures machining accuracy, low systematic and random error and repeatability. In this study, we developed micro machining system, which is equipped with air bearing stage for ultra precision machining and also we present the results of V-grooving experiments, conducted by the developed system, to verify the performance of system. The results show that the machined V-grooving had good accuracy with repeatable stability.

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Development of A Precision CNC Lathe for mirror surface (경면가공용 고정밀CNC 선반 개발)

  • 박천홍;이후상;신영재;이군석;김상환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.04a
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    • pp.646-650
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    • 1996
  • In this paper, A hydrostatic bearing spindle for high precision machining and a motor built-in spindle for high speed machining are developed toobtain the high precision machining accuracy of the prototype lathe. The sliding bearing with fluoric resin (turcite) pad is adopted for improving the damping charateristics of guide ways. The funning accuracy of moving elements isestimated to confirm the validity of application on the prototype; the high precision CNC lathe. The surface roughness of Cupper and Aluminum machined by the hydrostatic spindle are 0.07 .mu. m and 0.10 .mu. mRmax. The surface roughness of Aluminium machined by the built-in spindle are 0.10 .mu. mRmax. From this results, it is venified that the prototype lathe is effective to high precision maching.

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HIGH SPEED MACHINING CENTER AND USING CAM TECHNOLOGY

  • Kato, Noriyuki
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.06a
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    • pp.29-33
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    • 2000
  • OKUMA Die/Mold manufacturing system provides high speed, high rigidity and heavy cutting in a compact machining center and CAD/CAM system.

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Development of Micro-EDM Machine for Microshaft and Microhole Machining (미세 축ㆍ구멍 가공을 위한 미세방전가공기의 개발)

  • 김규만;최덕기;주종남
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.12
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    • pp.55-61
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    • 1998
  • Recently, the needs of machining technologies of very small parts have been increasing with advent of micro-revolution. These technologies have mostly used the method applied to semi-conductor production process such as LIGA, etc. But they have serious difficulties to settle down in terms of workpiece materials, machining thickness, 3-dimensional structure. Therefore. mciro-machining technology using EDM(Electrical Discharge Machining) was proposed. It is very difficult to machine the micro-parts (microshaft, microhole) using conventional machining. Micro-machining using BDM can machine the micro-parts easily because it requires little machining force. This MEDM(Micro-EDM) need the capabilities to move a electrode and control a discharge energy precisely, and the gap control strategy to maintain the optimal discharge condition is necessary. Therefore, in this study, the new EDM machine with high precision motion stage and high-performance EDM device was developed. Using this MEDM machine, we have machined microshaft and microhole with various shapes and sizes.

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The Machining Technique of Curved Surface through Constant Control of Cutting Speed Method in Ball End Milling (볼엔드밀 고속가공에서 곡면형상에 따른 절삭속도 일정제어기법 가공기술)

  • Kim, K.K.;Moon, S.J.;Kang, M.C.;Lee, D.W.;Kim, J.S.
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.753-759
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    • 2001
  • The purpose of this study is to suggest the machining technique of the constant control of cutting speed in order to improve precision machining and tool life in high speed machining using ball end mill. Cutting speed is changed in machining free form surface like free form surface. So, we don't have supreme surface form and toll life on machining. The way to solving this problem is that we should be settled to optimal cutting speed in free form surface machining. And, to improve precision machining is executed high speed machining method to output optimum NC data with developed constant control of cutting speed program after modeling of CAD/CAM. In this paper, a comparison was made of the cutting precision and tool life in conventional cutting and those in free form surface machining applying the program developed.

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