• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2004년도 춘계학술대회 논문요약집
• /
• pp.247-247
• /
• 2004

세라믹의 완전 소결체는 높은 경도와 취성을 가지기 때문에 연삭과 같은 입자가공이 행해지게 되어, 가공능률이 매우 낮고, 복잡한 형상 창성이 어렵다. 완전소결된 세라믹의 절삭가공에서는, 공구수명이 짧고, 가공속도가 매우 늦어 일반의 부품가공에 적용하기 어렵다. 또한 소결이 전혀 행해지지 않은 성형체의 절삭가공은 공작물의 강도가 약하기 때문에 가공속도, 가공능률, 부품의 척킹 및 치수 정밀도 등에 문제가 있다고 할 수 있다 이러한 문제 때문에 엔지니어링 세라믹의 고능률, 고품위 절삭에 관한 연구가 필요하다.(중략)

• 한국생산제조학회지
• /
• 제7권4호
• /
• pp.123-129
• /
• 1998

Ceramic and CBN tools are available for the difficult-to -cut-materials such as hardened carbon tool steel. stainless steel and etc. Ceramic tools are suitable for continuous turning cut, not for intermittent milling cut. Ceramic tools are likely to be chipped and abruptly broken before the appearance of normal wear in turning. In this study, TiN coated ceramic tools were found to restrain the chipping, breaking and early fracture and to increase the critical cutting velocity owing to TiN coating in PVD method.

• 한국정밀공학회지
• /
• 제18권9호
• /
• pp.89-95
• /
• 2001

Ceramic tool has to equip with not only high toughness and strength but also low thermal expansion and good thermal conductivity which leads to the high thermal shock resistance. These characteristics make it have longer tool life under thermal stress condition. In this study, commercial Si$_3$N$_4$ceramic cutting tool and home-made SiC based ceramic cutting tools which have different sintering time and chemical composition are tested under various cutting speed and the feed rate increase, the cutting force and the flank wear growth ratio increase, too. The performance of home-made SiC based ceramic cutting tool shows the possibility to be a new ceramic tool.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 2002년도 춘계학술대회 논문집
• /
• pp.106-111
• /
• 2002

The object of this study is a manufacture of burr die using CAD/CAM systems. Systems are consist of AutoCAD, CAM software and CNC milling machine. CAM software is purpose of G-code generation for CNC programming. Then CAM software and CNC milling machine are connect to RS-232-C cable for networking.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1996년도 춘계학술대회 논문집
• /
• pp.114-118
• /
• 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.

• 대한기계학회논문집A
• /
• 제24권4호
• /
• pp.900-906
• /
• 2000

Ceramic, PCD and CBN tools are available for the difficult-to-cut-materials such as hardened carbon tool steel, stainless steel, Inconel 718 and etc. Ceramic tools are likely to be chipped and abruptly broken before the appearance of normal wear in turning. Ceramic tools are suitable for continuous in turning, not for intermittent in milling. In this study, TiN/TiCN multi-layer coated ceramic tools were found to restrain the chipping, breaking and early fracture and to increase the critical cutting speed owing to TiN/TiCN multi-layer coating in Arc Ion Plating of PVD method.

• 한국정밀공학회지
• /
• 제12권6호
• /
• pp.112-119
• /
• 1995

Early fracture and cutting force of ceramic tool for hardened STC3 steel was investigated in this study. It was found that early fracture of ceramic tool was mostly occurred before normal wear was progressed beyond a critical cutting speed and normal wear was performed under the critical cutting speed. The relationships among critical cutting speed, which was a cause of early fracture, suggested cutting cross section, that is, maximum thickness of cut and width of cut, and cutting force were examined. The following conclusions were obtained: (1)Critical cutting speed showed a high value in the case of small maximum thickness of cut and large nose radius, but was not influenced by width of cut, (2)Principal, feed and radial force, respectively, showed the proportional value to constant cutting area, width of cut and maximum thickness of cut orderly, (3)Occurrence of early fracture was dependent upon radial force.

• 한국공작기계학회논문집
• /
• 제13권4호
• /
• pp.23-29
• /
• 2004

In this study, four kinds of $Si_3N_4$-based ceramic cutting tools with different sintering time were fabricated to investigate the relation among mechanical properties, grain size and tool life. They were used to turn gray cast iron at a cutting speed of 330m/min and depth of cut of 0.5mm and 1mm in dry, continuos cutting conditions. Multiple linear regression model was used to determine the relations among the mechanical property, grain size and the density. It was found that the combination of hardness and fracture toughness showed a good relation with tool life. It was also shown that hardness was the most important single element for the tool life.

• Tribology and Lubricants
• /
• 제6권2호
• /
• pp.50-59
• /
• 1990

일잔적으로 세라믹재료는 강도, 내식성, 내열성, 내마모성의 성질 등이 우수하여 신소재로서의 응용폭이 점점 확대되고 있으나, 가공성이 난삭재로 피삭성의 개발이 시급한 과제로 대두되고 있다. 본 연구에서는 가공 중 절삭열을 억제시키는 방안으로 극저온 내부 냉각공구시스템을 제작하고, 냉매로 액화질소를 순환 공급하면서 이때 난삭재인 세라믹 가공의 피삭성 향상의 가능성을 실험적으로 검토하였다.

• 세라미스트
• /
• 제4권3호
• /
• pp.92-97
• /
• 2001