• 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.

• 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.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.62-62
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• 2003

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.276-279
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• 1995

This paper is re;ated to the splits at the side of chips and the changes of surface roughness according to cutting conditions in precsion cutting. Compared with MCD, the surface roughness of workpiece cut by PCD was inferior at a small feed. But, there were no significant difference between MCD and PCD tool above a certain feed in surface roughness

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.145-150
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• 1992

화인세라믹의 우수한 공학적 특성으로 인한 최근의 이용가치 증대와 더불어 세라믹의 고정도 가공에 대한 관심이 높아지고 있다. 다이아몬드휠을 이용한 연삭이나 다이아몬드 공구를 이용한 선삭에 의해 세라믹의 고정도 표면생성을 실현시키고자 하는 연구가 활발히 진행되고는 있으나 아직 미흡한 상태에 있다. 따라서 전통적으로 고정도 표면생성에 널리 용되어 온 래핑에 의한 표면다듬질이 현재 행하여지고 있는 일반적인 방법이다. 본 연구에서는 화인세라믹의 고정도 표면생성을 위한 원통래핑 공정의 최적화 방법으로 실험계획법의 한 응용분야인 반응표면분석법을 이용하였으며 그 결과, 적은 재료와 시간으로 능률적이고 체계적인 실험 및 통계적인 분석을 통해서 원통세라믹의 고정도 표면생성을 위한 최적래핑조건을 찾아내었다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.645-646
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.265-266
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• 2011

• Journal of the Korean Society for Precision Engineering
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• v.17 no.12
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• pp.68-75
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• 2000

This paper presents the construction of an ultra-precision machining system and machining experiments using the developed system. The system is composed of air bearing system, granite bed, air pad, and linear feeding mechanism. The cutting conditions have great effect on the surface quality in ultra-precision machining. the ultra-precision machining is mainly processed by several ${\mu}{\textrm}{m}$ depth of cut and feed rate. For this, tools with sharper cutting edge and less tool wear are needed. To satisfy these requirement, diamond is generally used as a tool material for ultra-precision machining. In order to evaluate the cutting characteristics of the PCD and MCD tools on the aluminum alloy, the machining experiments performed using the developed system.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.05a
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• pp.687-691
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• 2000

Diamond turning machines for manufacture of precision optics require deliberate diagnosis to ensure that all the machine elements are properly operating, kinematically, dynamically and thermally, to produce demanded work qualities. One effective way is to directly inspect topographical features of work surfaces that have been carefully generated with prescribed machining conditions intended to exaggerate faulty consequences of any ill-operating machine elements. In this research, a very-large-scale Phase measuring interferometric system that has been developed for years at Korea Advanced Institute of Science and Technology is used to fulfill the metrological requirements fur the surface analysis. A special stitching technique is used to extend the measuring range, which integrates all the patches that are separately sampled over the whole surface while moving the stage. Then, the measured surface profile is analyzed to releated the machine error sources. For this, zernike polynomial fitting is used together with the wavelet filter and the fourier transform. Experimental results showed that the suggested technique in this study is very effective in diagnosing actual diamond turning machines

• 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.