• 제목/요약/키워드: Diamond Turning

검색결과 150건 처리시간 0.024초

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

  • 김우순;김동현;난바의치
    • 한국정밀공학회지
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    • 제21권8호
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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.

비철금속의 절삭성 평가를 위한 어트랙터 시뮬레이터의 구축 (Construction of Attractor Simulator for Cutting Characteristics Evaluation of Non-Ferrous Metals)

  • 고준빈;윤인식
    • 한국정밀공학회지
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    • 제20권1호
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    • pp.63-69
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    • 2003
  • This study proposes the construction of attractor simulator for cutting characteristics evaluation of non-ferrous metals. Also this paper aims to find the optimal cutting conditions of diamond turning machine by measuring surface form and roughness to perform the cutting experiment of non-ferrous metals, which are aluminum, with diamond tool. As well, according to change cutting conditions such as feed rate, cutting force and surface roughness are measured by tool dynamometer. Trajectory changes in the attractor indicated a substantial difference in fractal characteristics. Constructed attractor in this study can be used for cutting characteristics evaluation of non-ferrous metals

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

  • 김효식;양순철;김명상;김건희;이인제;원종호;조병무
    • 한국기계가공학회지
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    • 제6권4호
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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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Al합금의 초정밀 절삭특성 연구 (A Study on the Characteristics of Ultra-Precision Cutting for Al Alloy)

  • 김우순;김동현;난바의치
    • 한국공작기계학회논문집
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    • 제12권6호
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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.

초정밀가공기를 이용한 비철금속의 절삭특성에 관한 연구 (A study on the cutting characteristics of non-ferrous metals using diam odd turning machine)

  • 고준빈;김건희;원종호
    • 한국공작기계학회논문집
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    • 제10권5호
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    • pp.124-129
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    • 2001
  • The experimental study was the cutting characteristics of non-ferrous metals. The experimental apparatus was used the turning machine and diamond tool. This aimed at lading the optimal cutting conditions by measuring surface farm and roughness. Used non-ferrous metals were aluminum, brass and oxygen-free copper. As well, according to changing cutting conditions such as feed rate by measuring cutting farce and surface roughness and according to cutting conditions the non-ferrous metals studied about cutting properties.

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다이아몬드공구에 의한 초경합금의 절삭 (Machining of Wc-Co alloys with diamond tool)

  • 김성청
    • 한국생산제조학회지
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    • 제6권2호
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    • pp.102-111
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    • 1997
  • This paper deals with the machinability based on turning of WC-Co allows with the coated and the sintered diamond tools. The main conclusions obtained are as follows. (1) When machining WC-10%Co alloy, the flank wear of sintered diamond tool increases more largely with the increase of cutting speed in comparison with coated diamond tool. The tool wear decreases with the increase of the grain size and nose radius of sintered diamond tool. (2) When machining WC-20%Co alloy, the tool wear and cutting force decrease with the decrease of rake angle. Their exists a certain cutting speed range to exhibit the smallest tool wear in machining the WC-20%Co alloy, and this critical cutting speed becomes higher by 2 times in the case of coated diamond tool compared with sintered diamond tool. (3) The machinability becomes better with the increase of Co content. The effects of cutting speed and feed rate on the roughness of machined surface become smaller with the increase of Co content.

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

  • 김민재;이준기;황연;김혜정;김정호
    • 한국생산제조학회지
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    • 제21권2호
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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.

Thin Film Adhesion and Cutting Performance in Diamond-Coated Carbide Tools

  • Jong Hee Kim;Dae Young Jung;Hee Kap Oh
    • The Korean Journal of Ceramics
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    • 제3권2호
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    • pp.105-109
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    • 1997
  • The effects of surface conditions of the C-2 cemented carbide substrate on the adhesion of diamond film were investigated. The substrates were pretreated for different times with Murakami's reagent and then the acid solution of an H2SO4-H2O2. The adhesion strength was estimated by a peeling area around the Rockwell-A indentation. The cutting performance of the diamond-coated tools was evaluated by measuring flank wears in dry turning of Al-17% Si alloy. The morphology of deposited diamond crystallites was dominated by (111) and (220) surfaces with a cubooctahedral shape. The diamond film quality was hardly affected by the surface conditions of the substrate. The variation of tool life with longer substrate etching times resulted from a compromies between the increase of film adhesion at the interface and the decrease of toughness at the substrate surface. The coated tools were mainly deteriorated by chipping and flaking of the diamond film form a lock of adhesion strength, differently from the wear phenomena of PCD tools.

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Patterned free-standing diamond field emitters for iarge area field emission display applications

  • Kim, Sung-Hoon
    • Journal of Korean Vacuum Science & Technology
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    • 제3권1호
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    • pp.10-15
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    • 1999
  • Using micro-wells on the Mo substrate, we could obtain various tubular-volcano-types of free-standing diamond field emitters by depositing a diamond film detaching the film and turning the film upside down. The field emission characteristics of these structures were investigated as a function of size, shape and the number density of the tubular-volcano-type diamond field emitters. The field emission characteristics, especially the current density, were greatly enhanced with increasing the number density of the tubular-volcano-type diamond field emitters on the Mo substrate. Based on these results, we suggest that the reduction of the well size can give better field emission characteristics by the increase in the number density of the tubular-volcano-type diamond field emitters. Finally, we suggest the feasibility of fabricating a large-area field emission display using our patterned tubular-volcano-type free-standing diamond field emitters.

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

  • 윤영식
    • 대한기계학회논문집
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    • 제17권6호
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    • pp.1456-1464
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    • 1993
  • 본 논문에서는 다이아몬드 공구를 사용한 절삭과정에 대하여 절삭력 관계식을 제안하고, 이를 실제 천연 다이아몬드 공구를 이용하여 알루미늄 합금을 절삭하는 실험해석을 통하여 절삭력을 예측하는 모델을 세우고자 한다.