• 제목/요약/키워드: ultra-precise machining

검색결과 23건 처리시간 0.025초

복합가공기용 초정밀급 새들 가공을 위한 최적의 고정구 개발 (Development of the optimal Jig & fixture applied to ultra-precision saddle machining)

  • 김병창
    • 한국기계가공학회지
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    • 제13권3호
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    • pp.89-95
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    • 2014
  • The increasing level of demand for multi-tasking machines requires a saddle with an ultra-precise machining accuracy level of $15{\mu}m$, as such a saddle is one of the main components of these machines. The manner of achieving ultra-precise machining accuracy mainly depends on the fixed forces. In this paper, we optimized the number of contact points and the contact positions to reduce the deformation of the saddle while it is machined. The performance levels of the proposed optimal jig and fixture are determined by measuring the flatness, parallelism and perpendicularity of a machined saddle. The machining accuracy is found to be lower than $15{\mu}m$ at all measured points.

초정밀 단속 절삭을 이용한 다각형 미러의 절삭특성에 관한 연구 (A study of ultra-precision interrupt machining for an polygon mirror)

  • 박순섭;이기용;김형모;이재설
    • 한국기계가공학회지
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    • 제6권3호
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    • pp.65-70
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    • 2007
  • Generally, the core component of small precise optical device demands high accuracy of manufacturing processes. Although, the geometry of it is simple, the manufacturing technique to materialize is categorized as the ultra-precision machining and it must be done with the specialized machines and by the trained operator. Typical examples of small precise optical device are laser printer and phone camera. As a core part of laser printer, polygon mirror is used in laser scanning unit(LSU). It couldn't be fabricated with conventional machine but specified machine for polygon mirror machining. In this study, Polygon mirror with 16 surfaces was manufactured in the process of ultra-precision fly-cutting with Al material and investigated optimum machining conditions in terms of feedrate, pitch per cycle and depth of cut. Owing to process of polishing has bad influence on reflection angle, surface roughness, $R_{max}$=10nm, and form error, $Ra={\lambda}/10({\lambda}=632nm)$, are prerequisites for polygon mirror.

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고화소 디지털 카메라 비구면 Glass렌즈 초정밀연삭 특성에 관한 연구 (A Study on Grinding Characteristics of Aspherical Glass Lens core of High-pixel Digital Camera in Diamond Grinding Process)

  • 현동훈;이승준
    • 한국공작기계학회논문집
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    • 제12권2호
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    • pp.31-36
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    • 2003
  • Electronic or measuring instruments equipped with aspherical lens have recently been used since aspherical lens is more effective than spherical one. for the mass production of aspherical lenses, specific molds with precisely machined cores should be prepared. Some researches on the aspherical lens machining have been carried out to date. However, ultra-precise finding of aspherical or mold core has not been fully studied. In this study, the ultra-precise grinding and evaluating system were established to investigate the finding characteristics of aspherical lenses. Unlike conventional grinding process, since a highly-precise lathe were operated in a clean room without vibration the experimental results can be very useful for further studies on ultra-precise grinding process.

텅스텐 와이어 초단 펄스 미세 전해가공 (Tungsten Wire Micro Electrochemical Machining with Ultra Short Pulses)

  • 신홍식;김보현;주종남
    • 한국정밀공학회지
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    • 제24권6호
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    • pp.105-112
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    • 2007
  • Tungsten wire micro electrochemical machining (W-wire micro ECM) with ultra-short pulses enables precise micro machining of metal. In wire micro ECM, platinum wire has been used because it is electrochemically stable. However, the micro metal wire with low strength is easily deformed by hydrogen bubbles which are generated during the machining. The wire deformation decreases the machining accuracy. To reduce the influence of hydrogen bubbles, in this paper, the use of tungsten wire was investigated. To improve machining accuracy, suitable pulse conditions which affect generation of bubbles were also investigated. The tungsten wire micro ECM can be applied to the fabrication of various shapes. Using this method, various micro-parts and shapes were fabricated.

초정밀 사출성형 금형의 마이크로 홈가공과 전사성 (Study of transcription ability of optic polymer and Micro-grooving machining of ultra-precision injection molding moulds)

  • 곽태수;오오모리 히토시
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.623-624
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    • 2005
  • Micro injection molding is a branch of micro system technology and has been under development for the mass manufacture of micro parts. Enhanced technological products like micro optical devices are entering the market. This paper presents fundamental research on the injection molding technique in micro fabrication. In order to successful manufacturing of micro plastic parts, it is necessary to research for development of micro-injection machine, machining of micro mold, decision of optimum injection conditions and the research for polymer material. Therefore in this study, in order to machining of micro mold, a mold core with microscopic V-shaped groove was tooled by ultra-precise tooling machine. The transcription experiments with a polymer, PMMA resin on the surface of core with Ni plating were carried out and surface profile of injected parts was measured with AFM.

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

  • 정문섭
    • 한국생산제조학회지
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    • 제9권3호
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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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다이아몬드 터닝머신에서 다중점 B 축 제어 가공법을 통한 표면거칠기 향상 (Improvement in Surface Roughness by Multi Point B Axis Control Method in Diamond Turning Machine)

  • 김영복;황연;안중환;김정호;김혜정;김동식
    • 한국정밀공학회지
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    • 제32권11호
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    • pp.983-988
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    • 2015
  • This paper details a new ultra-precise turning method for increasing surface quality, "Multi Point B Axis Control Method." Machined surface error is minimized by the compensation machining process, but the process leaves residual chip marks and surface roughness. This phenomenon is unavoidable in the diamond turning process using existing machining methods. However, Multi Point B axis control uses a small angle (< $1^{\circ}$) for the unused diamond edge for generation of ultra-fine surfaces; no machining chipping occurs. It is achieved by compensated surface profiling via alignment of the tool radial center on the center of the B axis rotation table. Experimental results show that a diamond turned surface using the Multi Point B axis control method achieved P-V $0.1{\mu}m$ and Ra 1.1nm and these ultra-fine surface qualities are reproducible.

32" 대면적 V-형상 미세 패턴을 위한 초정밀 가공기술 개발 (Development of Ultra-Precision Machining Technology for V-Shape Micropatterns with 32" Large Surface Area)

  • 이성근;김현철
    • 한국정밀공학회지
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    • 제28권3호
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    • pp.315-322
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    • 2011
  • High-accuracy micropatterns such as V-shaped microgrooves are increasingly in demand for various engineering areas. And the technical trend goes for large surface areas in precision machining technology. So micropatterns with large surface areas are expected to play an increasingly important role in today's manufacturing technology In this study, we focused on developing machining technologies. First, a machine vision system for precise tool setting is developed. Second, an on-machine measurement (OMM) system for large-area measurement is implemented. And also software for tool path generation and simulation is developed. With these technologies we fabricated large-surface micropatterns in an electroless nickel-plated workpiece with single-crystal diamond tools and a 32-in, $675mm{\times}450mm$ mold with tens of V-and pyramid-shaped micropatterns.

마이크로 머시닝에서의 공구 정렬과 가공정밀도 (Tool Alignment and Machining Accuracy in Micro End Milling)

  • 안주은;이성호;곽재섭
    • 한국생산제조학회지
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    • 제25권2호
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    • pp.143-148
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    • 2016
  • A micro end mill is one of the precise tools used in machining ultra-precision products such as microchannel and micropatterned mold. To achieve the required precision of these products, several studies investigated the cutting force, burr formation, and burr generation mechanism of micro end mills; however, there are few studies on the alignment of micro tools, which is the foundation of machining. Hence, in this investigation, relation expressions were derived to determine the relation between the misalignment parameters and the machining accuracy. At the same time, the effect of the machining parameters was analyzed using a multiple linear regression analysis and the analysis of variance. The results indicate that the tilting angle of a micro tool has more influence on the machining accuracy than other parameters.