• Title/Summary/Keyword: Ultra-precision turning

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The property of WC(Co 0.5%) Ultra precision turning for Glass Lens molding (Glass Lens 성형용 초경합금(Co 0.5%)의 초정밀 절삭특성)

  • Kim, Min-Jae;Lee, Jun-Key;Kim, Tae-Kyoung;Hwang, Yeon;Kim, Hye-Jeong;Kim, Jeong-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.41-41
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    • 2010
  • In this research, to study tungsten carbide alloy(Co 0.5%) ultra precision turning possibility that is used Glass Molding Press(GMP) using conventional (Rake angle $-25^{\circ}$) single crystal diamond bite observed machining surface condition, surface roughness($R_a$), diamond bite cutting edge after tungsten carbide alloy ultra precision turning. Suggested and designed optimum chamfer bite shape to suggest ultra precision optimum bite using Finite Element Analysis(FEM). After machining tungsten carbide alloy ultra precision turning using optimum chamfer bite and comparing with conventional bite machine result and studied optimum chamfer bite design inspection and also tungsten carbide ultra precision turning possibility for high temperature compression glass lens molding.

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The property of WC(Co 0.5%) ultra precision turning for optical pick-up objective lens molding press for optical infomation storing(I) (광정보저장용 광픽업 대물렌즈 성형용 초경합금 (Co 0.5%) 초정밀절삭 특성(I))

  • Kim, Min-Jae;Lee, Jun-Key;Hwang, Yeon;Kim, Hye-Jeong;Kim, Jeong-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.11a
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    • pp.178-178
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    • 2009
  • High-density optical information storing equipment, which is using Blu-ray, is the next generation information storing equipment that has about form six times to thirty-five times capacities. and high-density optical information storing equipment uses high NA(Numerical Aperture) aspheric glass objective lens as optical pick-up equipment to record and recognize high-density date. Generally this objective lens is developed and produced through a way of GMP(Glass Molding Press) that uses molding core that is performde by Ultra precision grinding, but grinding performing that has high-accuracy is very difficult because objective lens form is high NA. In this research, we preformed Ultra precision turning, using single crystal diamond bite, about WC(Co 0.5%), sintering brittleness material that is used molding core's material for GMP. and we confirmed aspheric glass lens compression of deformities molding core's Ultra precision turning possibility by measuring surface roughness(Ra) and processing surface's condition.

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

  • Kim, Young-Bok;Hwang, Yeon;An, Jung-Hwan;Kim, Jeong-Ho;Kim, Hye-Jeong;Kim, Dong-Sik
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.11
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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.

A Study on the Ultra-Precision Turning of Al Alloy (Al합금의 초정밀 선삭가공)

  • 김우순;채왕석;김동현;난바의치
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.04a
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    • pp.416-421
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    • 2003
  • To obtain the surface roughness with range from l0nm to In n need a ultra-Precision machine, cutting condition and the study of materials. And n have to also consider the chip and vibration of diamond tool during processing. In this paper, the cutting conditions for getting mirror surface of aluminum alloy have been examined experimentally by using ultra-precision turning and single crystal diamond tool. In generally, the cutting conditions have effect on the surface roughness in ultra-precision turning. The result of surface roughness was measured by the ZYGO New View 200.

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A Study on the Characteristics of Ultra-Precision Cutting for Al Alloy (Al합금의 초정밀 절삭특성 연구)

  • 김우순;김동현;난바의치
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.6
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    • pp.44-49
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    • 2003
  • To obtain the surface roughness with range from 10nm to 1nm we need the study of ultra-precision machine, cutting condition, and materials. In this paper, the optimal cutting conditions for getting mirror surface of aluminum alloy have been examined experimentally by using ultra-precision turning machine and sing1e crystal diamond tool. In generally, the cutting conditions such as feed rate and depth of cut have effect on the surface roughness in ultra-precision turning. The result of surface roughness was measured by the ZYGO New View 200. Therefore, The surface roughness and cutting conditions has been clarified. The smooth surface of aluminum alloy less than 1nm RMS, 1nm Rmax can be obtained by the ultra-precision cutting.

A Study on the Machinability of Electroless Nickel by the Ultra-Precision Diamond Turning (초정밀 다이아몬드 터닝에 의한 무전해 니켈의 피삭성 연구)

  • 김우순;김동현;난바의치
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.8
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    • pp.27-33
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    • 2004
  • The ultra-precision cutting is a key technique for the manufacture of optical components such as aluminium mirrors, electroless nickel mirror, plastic mirror in a variety of advanced science and technology applications. The paper presents experimental results of ultra-precision diamond fuming of electroless nickel materials. In general, the cutting condition such as feed rate and depth of rut, have effect on the surface roughness in ultra-precision diamond turning. To obtain an optimal cutting condition, we studied the effect of the cutting speed. the tool length, the tool nose radius, the feed rate and depth of cut on the surface roughness. So, the relationship of the surface roughness and cutting condition has been clarified. From the experimental results, the machined surface roughnesses were obtained less than 1nm rms.

An Experimental Study of Ultra-precision Turning of High Transmittance Optical Glass(SF57HHT) (고투과율 광학유리(SF57HHT) 초정밀절삭의 실험적 연구)

  • Kim, Min-Jae;Lee, June-Key;Hwang, Yeon;Kim, Hye-Jeong;Kim, Jeong-Ho
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.2
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    • pp.191-195
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    • 2012
  • Heavy flint optical glass(SF57HHT) is new material that has extremely high transmittance. Due to brittleness and high hardness, optical glass is one of the most difficult to materials for ultra-precision turning. According to the hypothesis of ductile machining, all materials, regardless of their hardness and brittleness, will undergo transition from brittle to ductile machining region below critical undefromed chip thickness. In this study, cutting test was carried out to evaluate cutting performance of heavy flint glass using ultra-precision machine with single crystal diamond bite. The machined workpiece surface topography, tool wear and surface roughness were examined using AFM and SEM. The experimental results indicate that the machining mode become the brittle mode to ductile mode, when the maximum undeformed chip thinkness is large than critical value. Tool wear mainly occurs on the flank face and its wear mechanism is dominated by abrasion. This study demonstrates the feasibility of SF57HHT by diamond turning.