• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.04a
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• pp.438-442
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• 1994

절삭가공에서 공구의 마멸은 생산의 최적화에 영향을 주는 가장 중요한 요소중의 하나라고할 수 있다. 따라서 생산시스템이 자동화되고 유연성 및 생산성이 증대되면서, 공구의 수명이 끝났을 때의 공구교환을 위한 최적 의사 결정전략(Decision making stratagy)은 그 중요성이 점차 커지고 있다. 한편, 공구는 마멸의 진행에 따라 그 수명을 예측하여 교환해 주는 것이 바람직하다. 그러나 공구의 마멸은 여러가지 요인들의 복합적 작용에의해 발생하는 현상 이므로 그것을 정확히 예측한다는 것은 많은 어려움이 있다. 본 연구에서는 절삭력을 이용하여 공구의 여유면마멸 (Flank wear)과 경사면마멸을 감지하고자 한다 먼저 절삭력을 정적인 성분(Static component)과 동적인 성분(Dynamic component)로 구분하여 공구의 마멸을 감지하는데 이용하였다. 절삭력의 정적인 성분은 절삭조건의 변화에 대해 정규 화된(Normalized) 절삭력으로 모델링하여 공구의 여유면 마멸을 감지 하였다. 또한 공구의 경사면마멸이 발생한 경우에는 절삭력의 동적인 성분이 크게 변화함을 알 수 있었다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2004.04a
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• pp.42-47
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• 2004

Formed insert type tool satisfy both the surface roughness and geometric accuracy, so that cutting edge of formed tool can duplicate final feature. For experiment the formed tools with various clearance angles are machined. And the tools are evaluated with respect cutting force, flank rear and surface roughness to optimistic condition.

• Journal of the KSME
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• v.30 no.4
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• pp.367-373
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• 1990

초정밀 절삭용 다이아몬드 공구의 날끝 형상에 관해서는 여러 가지 설계안이 개발되어 제각기 성공적으로 사용되고 있지만 제품 품질의 균일성, 즉 성능과 수명의 차이는 아직까지 미해결이다. 또한, 초정밀공구의 날끝 능선에 관해서 최근 측정 데이터가 발표되고 있으나, 양호한 날끝능선, 불량한 능선 및 소정의 다듬질이 이루어지지 못하고 수명에 달해버린 능선 등에 대한 제각기의 형상, 구조 등이 밝혀지지 않고 있으며, 공구의 제작법을 개발하는 것은 금후의 연구과제로 남 아있다. 그리고, 단결정 바이트의 연마에 대해서는 많은 기술적인 진전이 이루어져 왔으나, 수 명의 차이는 해결하지 못하고 있다. 이는 날끝능선의 연마방향과 더불어 다이아몬드의 이방성, 원석의 품질 등과 관련이 있다고 볼 수 있다. 공구의 마멸과정이 결정방위에 의존하는 것은 당연하겠지만, 공구의 연마가공에서는 이방성 그 자체가 공구마멸에 나타나는 문제 및 경사면과 여유면의 마멸과 달리 예리한 인선을 둔화시키는 날끝 능선의 마멸은 어떻게 진행되는가가 문 제이며, 공구의 결정방위와 성능, 수명과의 관련은 실험적으로 해명되어야 할 것이다. 또한 재 료인 다이아몬드 원석에 있어서도, 커다란 결함이 발견된 것은 제외되지만 극히 경미한 결함은 어디까지 허용될 것인지가 문제이다. 내부응력, 착색 등 결함의 인자는 다양하지만 제각기 공구 의 성능 및 수명과의 관련은 명확하게 밝혀져 있지 않다. 이러한 인자 중에서도 어느 것이 가장 크게 영향을 미치는지 확인된다면 커다란 진보가 이루어질 것으로 기대된다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.04a
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• pp.114-118
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• 1996

Evaluation of cutting condition is one of the most important aspect to improve productivity and quality. In this study, the wear and cutting characteristics(cutting force, acoustic emission signal and surface roughness) of ceramic cutting tool for hardened die material(SKD11) were investigated by experiment. Flank wear on relief face of tool was occurred more dominant than crater wear on rake face. Experiments were performed under the various cutting condition.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.04a
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• pp.130-134
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• 1996

The characteristics of AE(Acoustic Emission) signal is related to cutting conditio, tool material, and tool geometry in metal cutting. The relation between AE signal and tool life was investigated experimentally. Experiment is carried out by gear shaping and SCM 420 workpiece. AE RMS voltage were increased according totool wear. It is suggested that maximum value of AE RMS voltage is an effective parameter to monitor tool life.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.6 no.4
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• pp.124-129
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• 1997

The experimental investigation is mainly focused to detect tool wear by cutting signal measurements in multi-insert face milling SS 41 and STS 304. This research have investigated the effects on the insert number, which has relationship with mean-cutting force. AE(acoustic emission) signal, tool life and surface roughness in machining SS41 and STS 304. The cutting force and AE signal are monitored to analyse the cutting process, The surface roughness of the specimens machined by TiN coated tool with the various insert numbers measured at various cutting speeds, feed rates and depths of cut, The width of flank wear is also observed.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.1
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• pp.222-231
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• 1996

Temperature distribution on the flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junciton imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with igh speed steel. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.

• Journal of Advanced Marine Engineering and Technology
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• v.19 no.1
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• pp.45-53
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• 1995

Temperature distribution on flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on flank face of cutting tool with high speed steel. The analytical results show that the temperature on the top flank face of a tool is higher because of the difference of the friction velocity on each face of the tool.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.17 no.6
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• pp.23-27
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• 2008

This study is to evaluate the tool life of portable beveler which have various cooling system. It was compared with 3 different bevelers which has each other cooling system. Beveler A has no cooling system, beveler B has the cooling system for only inside of body, and beveler C has the cooling system for both the cutter and inside of body. The temperature of beveler A cutter surface had been continuously increasing as processing, but the rising tendency of temperature of beveler B cutter surface has slightly changed. In case of beveler C, the temperature is maintained. The tool life of beveler C is about 105m which is around 400% of beveler A(25m), and around 130% of beveler B(80m).

• Journal of the Korean Society for Precision Engineering
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• v.12 no.10
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• pp.102-112
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• 1995

Temperature distribution on the rake face and flank face in orthogonal turning with cutting tool of high speed steel is studied by using a finite element method and experiments. Experiments are carried out to verify the validity of the temperature measurement by using a thermoelectric couple junction imbedded in a cutting tool of high speed steel. Good agreement is obtained between the analytical results and the experimental ones for the temperature distributions on both the rake face and flank face of cutting tool with high speed steel. The analytical results show that the temperature on the top flank face of a tool is higher than it on the top rake face of the tool because of the difference of the friction velocity on each face of the tool.