• 한국정밀공학회지
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• 제28권1호
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• pp.11-18
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• 2011

A worm screw is widely used in a geared motor unit for motion conversion from rotation to linear. For mass production of a high quality worm, the current rolling process is substituted with the milling process. Since the milling process enables the integration of all operations of worm manufacturing on a CNC(Computer Numerical Control) lathe, productivity can be remarkably improved. In this study, the tooling system for side milling on a CNC lathe to improve machinability is developed. However, the cutting tool-workpiece interference is important factors to be considered for producing high quality worms. For adaptability of various worms machining, the tool-workpiece interference simulation system based on a tool-tip trajectory model is developed. The developed simulation system is verified through several kinds of worms and experimental results.

• 한국기계가공학회지
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• 제8권4호
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• pp.76-82
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• 2009

A worm screw is widely used in a geared motor unit for motion conversion from rotation to linear motion. For mass production of a high quality worm, the current roll forming process is substituted with the milling cutter process. Since the milling cutter process enables the integration of all machining operations of worm manufacturing on a CNC(Computer Numerical Control) lathe, productivity can be remarkably improved. The tooling system for side milling cutter on the CNC lathe to improve machinability is developed. However, the runout of spindle and cutting tips are important factors to be considered for producing high quality worms because the tooling system has multiple tips. In this study, surface roughness variations accuracy according to runout was investigated in side milling cutter for worm screw. The result shows by simulation and experiment.

• 한국산학기술학회논문지
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• 제6권6호
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• pp.555-559
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• 2005

본 연구는 로터리 압축기의 사이드 블록 제작에 CAD/CAM을 활용한 것이다. 캠 시스템은 CAD(Solidworks), CAM(I-MASTER) 소프트웨어 및 CNC 밀링으로 이루어져 있다. 캠 소프트웨어는 컴퓨터 수치 제어 프로그래밍을 위한 G-코드 작성에 쓰인다.

• 한국산학기술학회논문지
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• 제9권3호
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• pp.615-620
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• 2008

저저항 배선층으로 쓰일 수 있는 선폭 $0.5{\mu}m$, 70nm 높이의 폴리실리콘 패턴에 $10nm-Ni_{1-x}Co_x$(x=0.2, 0.6, and 0.7)의 금속 박막을 열증착법으로 성막하고 쾌속 열처리 (RTA) 온도를 $700^{\circ}C$와 $1000^{\circ}C$로 달리하여 실리사이드화 공정을 실시하여 상부에 니켈코발트 실리사이드를 형성시켰다 이때의 미세구조를 확인하고 FIB (focused ion beam)를 활용하여 저에너지 조건 (30kV-10 pA-2 sec)에서 배선층을 국부적으로 조사하여 실리사이드 층의 선택적 제거 가능성을 확인하였다. 실험 범위내의 실리사이드화 온도 범위와 NiCo 상대 조성 범위에서 주어진 FIB 조건으로 선택적으로 저저항 실리사이드 층의 제거가 가능하였으나, 상대적으로 Co 함유량이 많은 실리사이드는 배선층 내부에서 기포가 발생하였으며, 이러한 기포로 인해 실리사이드 층만의 국부적 제거는 불가능하였다.

• 한국정밀공학회지
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• 제23권10호
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• pp.44-51
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• 2006

According to global trend of the expanding need of high-quality automobiles, the usage of small precise worm consisting of gearing part for motors to actuate convenience modules has increased rapidly. Precision of those worms has very sensitive characteristic to motor performance and noise. Forming process has been generally used to manufacture worms because of its mass productivity. However, it has problems such as deformation due to residual stress and wear of dies. Planetary milling and side milling are among alternatives using cutting tools. To overcome those problems the two machining methods have some contrast features in the sense of tool numbers and cutting mechanism. In this paper, machinability of both methods was compared in terms of cutting force, precision and cycle time.

• 한국생산제조학회지
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• 제22권3호
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• pp.437-446
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• 2013

There have been numerous studies on end milling processes. However, these have been restricted to the application of tools for special cutting purposes. A side milling cutter can handle long, deep, and open slots in a more efficient manner, and it provides the best stability and productivity for this type of milling. In this paper, a method to predict the cutting forces in side milling is described, and simulated cutting forces are compared with those obtained by cutting experiments. In particular, the side milling process easily generates relative motion between the tools and the workpiece because it produces intermittent cutting forces that cause vibrations over a wide frequency range. Therefore, the application of a dynamic cutting model instead of a static cutting model is appropriate to forecast the cutting forces more accurately.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1893-1896
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• 2005

Cutting force and face roughness have the largest influence on precision of a structure or processing efficiency in cutting processing. Thus cutting force model and face roughness model are necessary for this interpretation. In this paper, tool path model and face roughness model which consider the blade number of a tool and a revolution speed of tool and workpiece in the worm processing using side milling cutter are presented. This model was used to forcast the cusp. Experimental results show that the predicted cusp coincides with experimental one.