• Title/Summary/Keyword: Single Point Diamond Turning

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Prediction the surface profile in the single point diamond turning (정밀 선삭가공에서의 표먼거칠기곡선 예측)

  • Yoon, Young-Sik;Lee, Sang-Jo
    • Journal of the Korean Society for Precision Engineering
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    • v.11 no.5
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    • pp.189-198
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    • 1994
  • The achievable machining accuracy depends upon the level of the micro-engineering, and the today's accuracy targets are dimensional tolerances in the order of 10nm and surface roughness in the order of 1nm. Such requirements cannot be satisfied by the conventional machining processes. Single point diamond turning is the one of new techniques which can produce the parts with such accuracy limits. The aims of this thesis are to get a better understanding of the complex cutting process with a diamond tool and, consequently, to develope a predicting model of a turned surface profile. In order to predict the turned surface profile, a numerical model has been developed. By means of this model, the influence of the operational settings-the material properties of the workpiece, the geometry of the cutting tool and the dynamic behaviour of the lathe-and their influences via the cutting forces upon the surface roughness have been estimated.

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Ultra-precision single point diamond turning (SPDT) on an aspheric metal secondary mirror (초정밀 단일점 다이아몬드 터닝을 이용한 비구면 금속 부반사경 가공)

  • Kim, E. D.;H. S. Yang;Kim, G-H.
    • Proceedings of the Optical Society of Korea Conference
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    • 2001.02a
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    • pp.96-97
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    • 2001
  • A 110 mm diameter aspheric metal secondary mirror for a test model of an earth observation satellite camera was fabricated by ultra-precision single point diamond turning (SPDT) . Without a conventional polishing process, the surface texture of R$\sub$a/=2.8 nm, and the form error of R$\sub$a/=0.05 λ has been stably achieved In a laboratory condition. (omitted)

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A Study on the Micro Turning Machinability of A1-Mg Alloy Using Polycrystalline Diamond Tool (다결정 다이아몬드 공구를 이용한 Al-Mg계 합금의 미소선삭가공특성에 관한 연구)

  • Hwang, Joon;Namgung, Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.5
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    • pp.122-130
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    • 1996
  • In this study, machinability of some aluminum-magnesium alloy are experimentally investigated using polycrystalline diamond tool with turning, and evaluated some independent cutting variables affected micrometal cutting characteristics as cutting force, specific cutting resistance, shear angles. To know the effect of cutting parameters of single point diamond machining, experiments were performed to measure cutting forces for high speed turning of aluminum alloy 6061-T6, SM45C and FC20 with poly- crystalline diamond and coated cemented carbide tool. Independent cutting variables were changed to a variety of cutting speed, feed rate, rake angles, material properties of workpiece and tool. Futhermore. Some useful informations are obtained in this study can guide micro metal cutting of aluminum alloy with diamond tool.

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Optical Application of Diamond Turning Process (광학 응용을 위한 다이아몬드 터닝 가공)

  • 이봉주;김대중;정상화;박순섭;김상석;김정호;유영문;김주하
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1881-1884
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    • 2003
  • Diamond turning machines have, been used for the processing of surface like a mirror with the control scheme of minimizing shape error, Ultra-precision diamond fuming is applied to produce highly precision optical components required not only a high machining accuracy but also a good surface roughness. Al-6061 is widely used as optical parts such as laser reflector's mirror or multimedia instrument. In this study, thermal-imaged Al flat mirrors are fabricated by SPDT. The surface roughness 3.472 nm Ra, power 2 fringe(at 632.8 nm) and irregularity 1 fringe(at 632.8 nm) for form waviness of thermal-imaged Al flat mirror are very satisfied to the required specification in industry.

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Cutting Force Prediction in Single Point Diamond Turning (정밀 선삭 가공 과정의 절삭력 예측모델)

  • 윤영식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.6
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    • pp.1456-1464
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    • 1993
  • The achievable machining accuracy depends upon the level of the micro-engineering, and the dimensional tolerances in the order of 10 nm and surface roughness in the order of 1 nm are the accuracy targets to achieved today. Such requirements cannot be satisfied by the conventional machining processes. Single point diamond turning is one of the new techniques which can produce the parts with such accuracy limits. The aims of this thesis are to get a better understanding of the complex cutting forces. A cutting model for describing the influence of cutting conditions (cutting speed, feedrate and depth of cut), material properties of the workpiece and tool geometry has been proposed after estimating the two cutting force models-the Recht model and the Dautzenberg model. The experiments with Al-alloy workpieces, which have been carried out in order to estimate the models, show that the proposed model in this thesis is better than the two models. As the depth of cut and feedrate are increased in the operations settings (depth of cut 8-100$\mu{m}$, feedrate 8-140$\mu{m}$/rev, and cutting speed 8 m/sec), the relation of dimensionless cutting forces from experiments are similar to the proposed model. With the undeformed chip area of $30-80{\times}10^{2}$\mu{m}^2$, the experimental cutting forces accord with the force prediction.

Assessment of Subsurface Damage in Ultraprecision Machined Semiconductors

  • Lucca, D.A.;Maggiore, C.J.;Rhorer, R.L.;Wang, Y.M.;Seo, Y.W.
    • Tribology and Lubricants
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    • v.11 no.5
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    • pp.156-161
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    • 1995
  • The subsurface damaged layer in ultraprecisison machined single crystal Ge was examined by ion channeling. Single crystal Ge surfaces were prepared by chemo-mechanical polishing, mechanical polishing with 1/4 gm diamond abrasive, single point diamond turning and ultraprecision orthogonal flycutting. The extent of subsurface lattice disorder was compared to the crystal's orginal surface quality. Ion channeling is seen to be useful for quantitative measure of lattice disorder in finely finished surfaces.

Development of On-machine Measurement System utilizing a Capacitive-type Sensor (정전용량형 센서를 이용한 기상계측시스템의 개발)

  • 김건희;박순섭;박원규;원종호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.391-395
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    • 2002
  • 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 leaf spring mechanism and a capacitive-type sensor. The contact probe is attached on the z-axis during measurement while aspheric objects are supported on the single point diamond turning machine(SPDTM). 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 20 nanometers with a $\pm$20 uncertainty of 300 nanometers.

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Ultra Precision Machining the Characteristics of IR Detection device HgCdTe (초정밀 가공기를 이용한 적외선 감지소자 HgCdTe의 절삭특성에 관한 연구)

  • Kim, Hyo-Sik;Yang, Sun-Choel;Kim, Myung-Sang;Kim, Geon-Hee;Lee, In-Je;Won, Jong-Ho;Cho, Byoung-Moo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.6 no.4
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    • pp.50-56
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    • 2007
  • This study aims to find the optimal cutting conditions, when are IR Detection device HgCdTe is machined with diamond tool of diamond turning machine. Machining technique for HgCdTe with single point diamond turning tool is reported in this paper. The main factors influencing the machined surface quality are discovered and regularities of machining process are drawn. It has been found HgCdTe has more and more important applications in the field of modern optics. The purpose of our research is to find the optimum machining conditions for ductile cutting of HgCdTe and apply the SPDT technique to the manufacturing of ultra precision optical components of brittle materials.

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A Study of Aluminum Reflector Manufacturing in Diamond Turning Machine (다이아몬드 터닝머신을 이용한 알루미늄반사경의 절삭특성)

  • 김건희;고준빈;김홍배;원종호
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.4
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    • pp.1-5
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    • 2002
  • A 110 m diameter aspheric metal secondary mirror for a test model of an earth observation satellite camera was fsbricated by ultra-precision single point diamond turning (SPDT). Aluminum alloy for mirror substrates is known to be easily machinable, but not polishable due to its ductility. A harder material, Ni, is usually electrolessly coated on an A1 substrate to increase the surface hardness for optical polishing. Aspheric metal secondary mirror without a conventional polishing process, the surface roughness of Ra=10nm, and the form error of Ra=λ/12(λ=632.8nm) has been required. The purpose of this research is to find the optimum machining conditions for reflector cutting of electroless-Ni coated A1 alloy and apply the SPDT technique to the manufacturing of ultra precision optical components of metal aspheric reflector.