• Title/Summary/Keyword: Poly Crystal Diamond

Search Result 14, Processing Time 0.026 seconds

A Study on the Tool Wear and Prediction of CBN, Poly Crystal and Single Crystal Diamond Tools in Cutting of Nickel (니켈절삭시 CBN, 소결 및 단결정 다이아몬드 공구의 마멸과 예측에 관한 연구)

  • 성기석;김정두
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.17 no.1
    • /
    • pp.120-130
    • /
    • 1993
  • Generally, the machinability of materials that have a good mechanical properties is poor. For materials having a high strength, high toughness, high strength in high temperature and wear resistance, it is difficult to remove a chip from work materials. These properties are well shown in a Nickel, so this metal is used in machine materials, semi-conductor industry, metal mold and optical fields etc. But it is limitted in use because of high cost and poor machinability. In this study, the cutting of pure Nickel was conducted to examine wear of CBN, poly crystal diamond (PCD) and single crystal diamond (SCD) tools. From the result, the CBN tool is superior to poly crystal diamond tools or single crystal diamond tools in terms of tool wear and tool wear is predictable from experimental data base.

A Study on the Precision Cutting Characteristics by the Diamond Tool on the Cutting Distance (다이아몬드 공구의 절삭거리에 따른 정밀가공 특성 연구)

  • Yu, Ki-Hyun;Cheong, Chin-Yong
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.7 no.5
    • /
    • pp.127-133
    • /
    • 1998
  • This research intends to gain the sight for the qualitative characteristics of precision cutting by using the CNC lathe with a mono-crystal diamond(MCD) and a poly-crystal diamond(PCD) tool on the cutting distance. In case of an MCD tool, as the cutting distance increases, the surface roughness becomes worse and the standard deviation of surface roughness is small. In case of a PCD tool, as the cutting distance increases, the surface roughness becomes stable with a large standard deviation. The cutting force ratio(Ft/Fn) decreases as the nose radius increases and the decreasing ratio becomes larger for small nose radius.

  • PDF

A Study on the Precision Cutting Characteristics for Different Cutting Edge Radii in Ductile Material (절인반경차이에 따른 연질재료의 정밀가공 특성 연구)

  • 권용기
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.9 no.1
    • /
    • pp.75-80
    • /
    • 2000
  • This paper deals with the precision cutting characteristics of mono-crystal diamonds poly-crystal diamonds and tungsten carbide tool on ductile material. The cutting tests were carried out under various uncut chip areas and 20${\mu}{\textrm}{m}$ depth of engagement. The machinability in precision machining was discussed from the viewpoints of the normal cutting forces and the surface roughness of the workpiece. As the feed rate decreases the normal force difference for cutting edge radii appears to large. In various cutting edge radii the surface roughness difference when cut the copper which is ductile material than the aluminium alloy is large. As the same cutting condition the hardness value on cut surface with the diamond tool appears to be smaller than that of the tungsten carbide tool.

  • PDF

A Study on the Surface Polishing of Diamond Thin Films by Thermal Diffusion (열확산에 의한 다이아몬드 박막의 표면연마에 관한 연구)

  • Bae, Mun Ki;Kim, Tae Gyu
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.34 no.2
    • /
    • pp.75-80
    • /
    • 2021
  • The crystal grains of polycrystalline diamond vary depending on deposition conditions and growth thickness. The diamond thin film deposited by the CVD method has a very rough growth surface. On average, the surface roughness of a diamond thin film deposited by CVD is in the range of 1-100 um. However, the high surface roughness of diamond is unsuitable for application in industrial applications, so the surface roughness must be lowered. As the surface roughness decreases, the scattering of incident light is reduced, the heat conduction is improved, the mechanical surface friction coefficient can be lowered, and the transmittance can also be improved. In addition, diamond-coated cutting tools have the advantage of enabling ultra-precise machining. In this study, the surface roughness of diamond was improved by thermal diffusion reaction between diamond carbon atoms and ferrous metals at high temperature for diamond thin films deposited by MPCVD.

Characteristics Evaluation of Surface Roughness with Ultra Precision Machining (초정밀 절삭가공에서 표면거칠기 특성 평가)

  • 강순준;이갑조;김종관
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
    • /
    • 2003.10a
    • /
    • pp.83-88
    • /
    • 2003
  • In this study, experiments were conducted with an ultra-precision machine, developed In domestic, to find the characteristics and the most suitable cutting conditions of ultra-precision machining. To maximize the performance of the machine, the machine was installed in a room that is protected from vibration and is maintained constant temperature and constant humidity. Selected work pieces are an aluminum-alloyed material, which has excellent corrosion resistance and has low deformation. The used tool is synthetic poly crystal diamond which has excellent abrasion resistance and has low affinity. Four types of tool nose radius were used such as 0, 0.1, 0.2 and 0.4mm. Machining is performed with cutting speed of 500, 800 and 1000m/min., feed rate of 0.005, 0.008, 0.010mm/rev. and cutting depth of 0.0005, 0.0025 and 0.005mm respectively which can generally be used in the field as a cutting condition. As a method of evaluation surface roughness was measured for each cutting condition and reciprocal characteristics are computed for each tool nose radius, cutting speed, feed rate and cutting depth. As a result the most suitable cutting condition and characteristics of ultra-precision machining were identified which can usefully be applied in the industrial field.

  • PDF

Characteristics Evaluation of Surface Roughness with Ultra Precision Machining (초정밀 절삭가공에서 표면 거칠기 특성 평가)

  • 강순준;김종관
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • v.13 no.1
    • /
    • pp.9-15
    • /
    • 2004
  • In this study, experiments were conducted with an ultra-precision machine, developed in domestic, to find the characteristics and the most suitable cutting conditions of ultra-precision machining. To maximize the performance of the machine, the machine was installed in a room that is protected from vibration and is maintained constant temperature and constant humidity. Selected work pieces are an aluminum-alloyed material, which has excellent corrosion resistance and has low deformation. The used tool is synthetic poly crystal diamond, which has excellent abrasion resistance and has low affinity. Four types of tool nose radius were used such as 0, 0.1, 0.2 and 0.4mm. Machining is performed with cutting speed of 500, 800 and 1000m/min., feed rate of 0.005, 0.008, 0.010mm/rev. and cutting depth of 0.0005, 0.0025 and 0.005mm respectively which can generally be used in the field as a cutting condition. As a method of evaluation, surface roughness was measured for each cutting condition, and reciprocal characteristics are computed for each tool nose radius, cutting speed, feed rate and cutting depth. As a result, the most suitable cutting condition and characteristics of ultra-precision machining were identified which can usefully be applied in the industrial field.

A study on the mirror like machining of Al-Si alloy for extraction of Si particle (Al-Si합금의 Si석출 경면가공에 관한 연구)

  • 이은상;김정두
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.16 no.12
    • /
    • pp.2279-2286
    • /
    • 1992
  • A hypereutectic Aluminum-Silicon Alloy is widely used in the parts of autombile because of high-resistance and good strength. In this study, the cutting of a hypereutectic Al-Si alloy (A390) for extraction of Si particle was experimentally investigated. By proper selection of cutting tool materials and optimization of cutting conditions, economical machining of this alloy is achieved. The surface roughness relates closely with the feed rate and cutting speed.

A Study on the Cutting Characteristics of Glass Fiber Reinforced Plastics by Tool Materials and Type (유리섬유강화 플라스틱의 공구재질 및 형상에 따른 절삭특성에 관한 연구)

  • An, Sang-Ook;Noh, Sang-Lai
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.20 no.4
    • /
    • pp.1216-1224
    • /
    • 1996
  • In the use of glass fiber reinforced plastics it is often necessary to cutting the components, but the cutting GFRP is often made difficult by the delamination of composites and the short tool life. In this paper, the machinability of GFRP by mean of tool materials and type was experimentally investigated. By proper selection of cutting tool material and type excellent machining of this workpiece is achieved. The surface quality relate closely with the feed rate and cutting tools.

Cutting Characteristics of Oxygen-Free Using the Ultra Precision Machining (초정밀가공기를 이용한 무산소동 절삭특성)

  • 고준빈;김건희;원종호
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.19 no.12
    • /
    • pp.120-126
    • /
    • 2002
  • The needs of ultra-precisely machined parts are increasing more and more. But the experimental data required to ultra precision machining of nonferrous metal is insufficient. The behavior of cutting in micro cutting area is different from that of traditional cutting because of the size effect. Copper is widely used as optical parts such as LASER reflector's mirror and multimedia instrument. In experimental, after oxygen-free copper is machined by ultra precision machine with natural mono crystal diamond tool (NCD) and synthetic poly crystal diamond tool (PCD), we compared chip formation and tool's wear according to used tool. Also, we researched optimized cutting condition with the results measured according to cutting condition such as spindle speed, feed rate and depth of cut. As a result, the optimal working condition that makes good surface roughness is obtained. The surface roughness is good when spindle speed is above 80 m/min, and feed rate is small and depth of cut is above 0.5 ${\mu}{\textrm}{m}$. In cutting of klystron anode and cavity 3.2 nmRa of surface roughness is obtained.