• Title/Summary/Keyword: High Speed Precision Machining

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Micro End-Mill Machining Characters and its Applications (마이크로 앤드밀의 가공특성분석 및 응용가공 연구)

  • Jae, Tae-Jin;Lee, Eung-Sook;Choi, Doo-Sun;Hong, Sung-Min;Lee, Jong-Chan;Choi, Hwan
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.589-592
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    • 2003
  • In the machining process of micros shape by using high-precision machining system and micro end-mill, it is important for machining characters of tools to be grasped in order to stably use tools of micro end-mill. In this study. we carried out an analytical experiment of basic machining features by using end-mill tools for the purpose of damage prevention and manufacture of high quality when the tools of micro end-mill are used. This experiment used a micro machining system with high precision and a variety of end-mill tools commercialized from tens to hundreds microns in diameter. To establish an optimal machining condition without tool damage, cutting force was analyzed according to the changes of tool diameter and cutting conditions such as cutting speed. feed rate, depth of cut. And an examination was performed for the shape and surface illumination of machining surface according to the changes of machining conditions. Based on these micro machining conditions, micro square pillar, cylinder shaft. thin wall with high aspect ratio, and micro 3-D structures such as micro gear and fan were manufactured.

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A Study on Optimization of Cutting Conditions Using Machining Characteristics DB in High Speed Machining (가공특성 지식DB를 통한 고속가공에서 최적조건선정에 관한 연구)

  • Won J.Y.;Nam S.H.;Hong W.P.;Lee S.W.;Choi H.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.163-168
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    • 2005
  • It is one of the most important things to determinate optimized cutting conditions which satisfy productivity and cost simultaneously in production and CAPP systems. These days many researchers have figured out the optimizing way for solutions of multi-object function to find the approach methods using algorithm such as genetic algorithm or tabu search, etc., instead of mathematical methods. The main creation of objective function is proposed by empirical method but which is difficult to set it up and to analysis. In this paper, an optimization method of cutting condition is shown using the ANN and GA for the multi-objective function in high speed machining.

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A Study on the Static and Dynamic Stiffness Evaluation of a High Speed Mold/Die Machining Center Structure (고속 금형가공센터 구조물의 강성평가에 관한 연구)

  • 최영휴;강영진;차상민;김태형;박보선;최원선
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.102-106
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    • 2003
  • An experimental modal analysis and dynamic stiffness evaluation of a moving body structure of a high speed machining center are presented in this paper. The natural frequencies and corresponding modes, and dynamic compliance of a moving body structure of high speed machining center are investigated by using F.E.M., hydraulic exciter test, and impulse hammer test. The lowest three natural frequencies were found to be 56.6 Hz, 112.7 Hz, and 142.7 Hz by FEA respectively, while those were 55 Hz, 112 Hz, 131 Hz by experimental analysis. Furthermore, both computed and measured absolute dynamic compliances of the moving body structure in iso-direction showed good agreement especially at the first two mode frequencies. With our experimental data, the dynamic characteristics of the machining center can be exploited to get a new development of structural dynamic design and modification.

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Development and Evaluation of the Characteristics of Porous Materials for a Mold (금형 소재용 다공질 재료의 개발과 특성 평가)

  • 박선준;정성일;임용관;정해도;이석우;최헌종
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.35-42
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    • 2004
  • At the large-sized mold fer injection molding, the remaining gas in the mold causes some problems with final products. In order to solve these problems, air-bent was drilled on the surface of mold. However, this method leaves the scar on the surface of a product. Therefore, porous material was developed to the removal of remaining gas in this study. Porcerax II, which is a commercialized porous material, were developed in USA. It requires the electric discharge machining(EDM) process to make pores on the surface of the materials. The electric discharge machining (EDM) process, however, cause the increase of the time and cost for the fabrication of the mold. In this study, high speed machining(HSM) process was applied to the fabrication of porous mold without electric discharge machining(EDM) process. Some characteristics of the developed materials machined by high speed machining(HSM) and electric discharge machining(EDM) including air-permeability and porosity were compared with those of Porcerax II. Besides, in order to be applied to the molding process, hardness and tensile & yield strength were compared between Porcerax II and developed materials.

A Study on the Evaluation of End Mills for High Speed Machining (고속용 엔드밀의 성능평가에 관한 연구)

  • 이정길;유중학;김문기;국정한
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.833-837
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    • 2000
  • The purpose of this study is an evaluation of end mills to develop appropriate tools for the high speed machining. First of all, several flat end mills which are produced by different makers are selected to analyze the performances of the tools. Experimental works are also executed to measure cutting force, tool wear and surface roughness for different cutting conditions. And then the results are compared and analyzed for developing optimal cutting tool in the high speed condition. Especially, analysis about tool wear is introduced in this research.

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A Study on the characteristics of the High Speed Machining for several Tool Materials change of Ellipse Mirror Machining to be used in Millimeter Wave Interferometer System (밀리미터파 간섭계용 타원 반사경의 공구 변화에 따른 고속절삭 특성 연구)

  • Lee, Sang-Yong;Kim, Geon-Hee;Kim, Hyo-Sik;Yang, Soon-Cheol;Hong, Chang-Deoc;Cho, Byung-Moo;Won, Jong-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.6 no.4
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    • pp.22-27
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    • 2007
  • This study aims to find the optimal cutting conditions, when ellipse mirrors consisted Aluminum alloy were made it the Millimeter-Wave Interferometer System mirror with several tools on the High-Speed Machine. Machining technique for precision machining characteristics of ellipse mirrors consisted Al6061 matter by Ball endmill is reported in this paper., Results of machining on the High-Speed Machine(using NCD(Natural Crystalline diamond), WC and coated TiAlN ${\phi}6mm$ ball endmill tool) had measurement of surface roughness and form accuracy with cutting conditions(the Feed rate, the Depth of cut and the Cutting speed). the Millimeter-Wave Interferometer System ellipse mirror had been machined foundational precision machining characteristics of aluminum.

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Design and Machining Precision Evaluation of Pneumatic Clamping Type Guide-bush System (공압식 소재물림 가이드부쉬 시스템의 설계 및 가공정도 평가)

  • Lee, Jae-Hoon;Yi, Su-Min;Park, Seong-Hun;Lee, Shi-Bok
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.19 no.6
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    • pp.859-866
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    • 2010
  • Generally, a fixed type guide-bush system is installed during machining miniature work-pieces with high precision in the multi-task CNC lathe. But a conventional guide-bush system does not provide a constant clamping force under the condition of varying work-piece diameters. It is important to maintain a constant clamping force for guaranteeing machining precision. This paper proposes a new guide-bush system with a pneumatic clamping device for the CNC Swiss-turn lathe to keep constant clamping force with changes in work-piece diameters. Through performance tests, new clamping system developed in the study showed better machining precision at the cost of a small increase in the temperature of the system than conventional systems due to an increase in the frictional heat and a change in the heat transfer route.

Machinability Evaluation with Cutting Direction in High Speed Machining of Free Form Surface through Ball End Milling (볼 엔드밀을 통한 자유곡면의 고속가공에서 절삭방향에 따른 가공성 평가)

  • Kim, Gyeong-Gyun;Gang, Myeong-Chang;Lee, Deuk-U;Kim, Jeong-Seok
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.84-89
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    • 2001
  • In recent years, there is increasing demand of esthetic design and complex function in aerospace, automobile and die/mold industry, which brings into limelight high-precision, high-efficient machining of sculptured surface. This paper deals with the establishment of the optimal tool path on free form surface in high speed ball end milling. Ball end milling is widely used for free form surface die and mold. In this machining, the cutting direction was changed with tool path. The cutting characteristics, such as cutting force and surface form are varied according to the variation of cutting directions. In this paper, the optimal tool path with down cutting in free form surface cutting is suggested.

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Improvement of Electrical Discharge Drilling (방전드릴링의 가공특성 향상)

  • Song, Ki-Young;Chung, Do-Kwan;Park, Min-Soo;Chu, Chong-Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.10
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    • pp.45-51
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    • 2010
  • Electrical discharge drilling (ED-drilling) is a widespread machining method used to bore small holes with a high aspect ratio. This paper presents additional methods by which ED-drilling can improve machining speed, tool wear, and machined surface quality. Firstly, for high machining speed, and low tool wear, a new-type electrode that was ground on one side or both sides of the cylindrical electrodes was suggested to expel debris. The debris which is generated during the machining process can cause sludge deposition and secondary discharge problems: major reasons to decrease machining speed. This new-type electrode also reduced tool wear that was due to the decrease of unstable discharge in a machining gap by helping to expel waste water and debris from the gap. Secondly, to improve the machined surface roughness, an electrolyzation process was included after drilling. This process made the machined surface smooth by means of an electrochemical reaction between an electrode and a workpiece. In this study, the machining speed, electrode wear, and surface roughness were improved by the newtype electrode and the electrolytic process.