• 제목/요약/키워드: Diamond turning machine(DTM)

검색결과 28건 처리시간 0.025초

DTM가공을 위한 2축 Stage의 정밀 이송특성연구 (Positioning control error of 2-Axis Stage for Diamond Turning Machine)

  • 이응석;박종진;이민기
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.309-312
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    • 2005
  • DTM (Diamond Turning Machine) is using for ultra precision manufacturing such as, plastic lens die or aspherical optics. This study is on a design of precision 2-axis stage for DTM. We designed and manufactured a back lash free stage using different weights and measured the positioning accuracy using Interferometer. Also, the 2-D moving accuracy is measured using the high magnification CCD technique. Then, the stage is tested with the machining of spherical and aspherical lens in a DTM with air bearing spindle. It was shown that the back lash free stage is effective for improving the positioning accuracy. Also, positioning control errors in motion control board were able to be found using the proposed stages system.

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정전용량센서를 이용한 대구경 비구면 형상의 기상측정에 관한 연구 (A Study on the On-machine Profile Measurement of Large Aspheric Form using Capasitive Sensor)

  • 김건희;원종호
    • 한국기계가공학회지
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    • 제2권3호
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    • pp.56-61
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    • 2003
  • This paper described about on-machine profile measurement of aspheric surfaces using contact probing technique in ultra precision machine. A contact probe has been designed as a sensing device to obtain measuring resolutions in nanometer regime using a circle leaf spring mechanism and a capacitive-type sensor. The contact probe which is installed on the z-axis is In touch with the aspheric objects which is fixed on the spindle of the diamond turning machine(DTM) during the measuring procedure. The x, z-axis motions of the machine are monitored by a set of two orthogonal plane mirror type laser interferometers. As a results, the developed contact probe on-machine measurement system showed 10 nanometers repeatability with a ${\pm}2{\sigma}$ and uncertainty of 200 nmPv.

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비구면 초정밀절삭 공정기술에 관한 연구 (A study on Ultra Precision machining process for Aspheric)

  • 김건희;홍권희;김효식;김현배;양순철;윈종호
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.90-93
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    • 2003
  • This paper described about the ultra-precision profile measurement of aspheric surfaces using contact probing technique. A contact probe has been designed as a sensing device to obtain measuring resolutions in nanometer regime utilizing a circle leaf spring mechanism and a capacitive-type sensor. The, contact probe is attached on the z-axis during measurement while aspheric object are supported on the diamond turning machine(DTM). The machine xz-axis motions are monitored by a set of two orthogonal plane mirror type laser interferometers. Experimental results show that the contact probing technique developed of on-machine measurement system in this investigation is capable of providing a repeatability of 10 nanometers with a $\pm$20 uncertainty of 200nmPv.

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단결정 다이아몬드 공구에 의한 Corner Cube 가공 시, 형상정밀도에 미치는 동 도금층의 경도의 영향 (Plating hardness and its effect to the form accuracy in shaping of corner cube on cu-plated steel plate using a single diamond tool)

  • 이준용;김창호;서충완
    • 한국기계가공학회지
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    • 제13권5호
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    • pp.64-69
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    • 2014
  • This article presents machining experiments to assess the relationship between the profile accuracy and the workpiece hardness using a natural diamond tool on an ultra-precision diamond turning machine. The study is intended to secure a corner cube prism pattern for reflective film capable of high-quality outcomes. The optical performance levels and edge images of corner cubes having various hardness levels of the copper-coated layer on a carbon steel plate are analyzed. The hardness of the workpiece has a considerable effect on the profile accuracy. The higher the hardness of the workpiece, the better the profile accuracy and the worse the edge wear of the diamond tool.

원추형상을 이용한 비구면 형상가공에 관한 연구 (A Study on Machining of Aspherical Surface using a cone.)

  • 이상민;박철우;이종항
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.1348-1352
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    • 2004
  • An aspherical lens in information technology has been increased in order to enhance the optical performances. There are two kinds of approaches to machine the aspherica surface is generally conducted by the diamond turning machine, precision grinding machine, and polishing machine. This technique, however, has a problem which needs an expensive and high precision machine in order to increase the surface roughness and the machining accuracy. In this paper, a machine, which is able to machine the aspherical surface, was developed to decrease the cost. Also, the machining of the aspherical surface using a cone was carried out experimentally in order to compare the experiment with the simulation. The results showed that the machining experiments of the aspherical surface by using the titled cone were in accordance with the simulation.

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적층된 구리 박판의 코너 큐브 패턴의 가공 (Machining of Corner-cube Pattern on Accumulated Cu-Thin Plates)

  • 이준용;배찬열;김창호
    • 한국기계가공학회지
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    • 제15권3호
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    • pp.109-114
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    • 2016
  • This study presents the optimal hardness range for a coated layer of a workpiece when the diamond tool cuts the corner-cube pattern on the coated plates using an ultra-precision diamond-turning machine. Two kinds of coated plates, which have the hardness range of 211~328 Vickers hardness, are used on the first experiments. The form accuracy for the corner-cube pattern could be achieved through the following experiments using the accumulated thin copper plates in second experiments, having optimal 265~275 Vickers hardness based on the basic first experiments without tool wear. When the number of machining adjustments was increased to seven times, having machining depth was reduced successively in second experiment, a fine surface could be achieved without tool wear.

원추형상을 이용한 비구면 형상가공기술

  • 이상민;박철우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 춘계학술대회 논문요약집
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    • pp.246-246
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    • 2004
  • 현재 비구면렌즈를 만들기 위해서는 다양한 방법이 있다. Glass종류의 가공시 초정밀 절삭가공기(DTM)에서 가공하거나 정밀 연삭기를 가지고 가공하게 된다. 이 과정에서 렌즈 표면에 공구 흔적이나 표면거칠기 개선을 위해 연마작업을 하게 되는데, 사용하는 장비가 폴리싱 머신이다. 축대칭인 폴리싱머신의 경우 X, Z, $\theta$로 동시 3축제어가 가능하다. 하지만 이 장비의 경우 연마에서 원하는 형상정밀도와 표면거칠기를 얻기 위해 각축들의 위치정밀도와 분해능이 높은 부품을 사용하여 기계자체가 고가라는 점이 단점으로 작용한다.(중략)

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DOE 렌즈 개발 현황과 전망

  • 김영준
    • 광학세계
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    • 제13권5호통권75호
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    • pp.20-22
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    • 2001
  • 향후 초박형 렌즈에 있어서 플라스틱 DOE Lens가 주도적으로 사용될 전망이고, 광통신분야에서도 WDM(wavelenght Division Multiplexer)등에 응용 가능성이 높다. DOE Pattern의 회절광량 해석기술, DTM(Diamond Turning Machine)과 Laser가공기의 정밀도 향상 등으로 금형가공기술의 급속한 발전과 함께 DOE의 보편화는 조만간 이뤄질 것으로 보인다.

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안경렌즈 코아 가공을 위한 비구면 형상 도출 프로그램 개발 (Program Development for Extracting the Numerical Data of Aspherical Surface for the Core Manufacturing of Ophthalmic Lens)

  • 이동희
    • 한국안광학회지
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    • 제12권4호
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    • pp.87-90
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    • 2007
  • polycarbonate(PC)용 안경렌즈를 생산하는데 사용되는 몰드(mold)를 가공하기 위해서는 코아(core)의 가공이 필요하다. 코아의 가공은 Diamond Turning Machine(DTM) 또는 Computer Numerical Control(CNC) 선반으로 이루어지는데 이러한 장비의 운용을 위해서는 렌즈 코아 형상에 대한 수치 데이터가 필요하게 된다. 이에 우리는 렌즈 코아 형상에 대한 수치 데이터를 산출하는 프로그램을 개발하였다. 프로그램은 일반 비구면 식의 계수를 사용하여 수치 데이터를 산출할 수 있도록 개발하였으며, 형상 그래프를 보여줄 수 있도록 하였고, 필요한 수치 데이터 파일을 저장할 수 있도록 하였다.

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