• Journal of the Korean Society for Precision Engineering
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• v.17 no.12
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• pp.26-33
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• 2000

• Journal of the Korean Society for Precision Engineering
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• v.17 no.12
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• pp.20-25
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• 2000

• Journal of the Korean Society for Precision Engineering
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• v.16 no.3 s.96
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• pp.189-197
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• 1999

기구의 운동에 있어서 공차는 필연적으로 운동 오차를 발생시키게 된다. 이상적인 기구의 운동을 위하여 공차를 작게 설정하는 것은 가공 또는 조립 비용을 증가시키는 반면에 제작 비용의 절감을 위하여 공차를 크게 설정하는 것은 기구의 운동 오차를 크게 증가시키게 된다. 따라서 기구의 운동오차를 고려한 효율적인 공차의 설정 및 배분이 중요하다. 이 논문은 민감도 해석을 이용하여 기구의 운동에 영향을 미치는 설계변수들에 어떻게 공차를 효율적으로 지정하고 분배하는 가를 연구하였다. 민감도 해석에서는 각 설계변수의 민감도 계수를 유도하였으며 설계변수에 공차를 지정하였을 때 발생할 수 있는 기구 운동의 최대 응답오차를 수식화 하였으며 역으로 기구 운동에 있어서 허용 응답오차를 설정하였을 때 각 설계 변수의 공차를 분배하는 과정을 유도하였다. 실제로 공차 분배 과정을 공업용 본봉 재봉기의 이송조절기구에 적용하여 허용 응답오차를 고려한 공차 설정을 합리적으로 수행할 수 있었다. 본 논문에서 제시한 공차 분배 과정은 재봉기 또는 로봇과 같이 기구운동과 밀접한 관련이 있는 기계의 설계에 유용할 것이다.

• Journal of the Korean Society for Precision Engineering
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• v.25 no.5
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• pp.7-14
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.323-324
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1105-1106
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• 2013

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.7 no.1
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• pp.75-80
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• 2008

This paper presents a new precision moving instrument for the displacement and direction control using the uni-morph type PZT actuator. The instrument is composed of the two-body and a link. The body has the uni-morph type PZT actuator, which make the vibration. Movement of simple moving instrument is generally analyzed by the theory of center-of-gravity moment. However the analysis of the instrument in this paper is focused the resonance of instrument. Resonance of the body is originated a uni-morph type PZT actuator that is vibrated by voltage and frequency. The basic performances of one body instrument are analyzed by the FEM analysis. And experiments are also performed to confirm the linear movement of the instrument and direction control. it is proper a voltage control than a frequency control for the direction changing. And Moving velocity is 0.032m/s.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.351-352
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• 2009

• Journal of the Korean Society for Precision Engineering
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• v.15 no.12
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• pp.48-54
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• 1998

In sewing, fabrics is fed by an elliptic motion of the feed dog. The feeding control mechanism controls an elliptic motion of the feed dog, finally, controls stitch spacings and feeding directions of fabrics. This study discusses the feeding control mechanism of an industrial lock stitch sewing machine, which is a good example to study a machine kinematics. This study makes mathematical expressions of machine's motion in the feeding control mechanism. Thus, the motions of this mechanism are characterized, which will be used for kinematic analysis of the feed dog later. Also, the above mathematical expressions may be a basis for the new design of the feeding control mechanism and may be applied to development of the similar feeding control mechanism of other type sewing machine.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.7
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• pp.104-118
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• 1998

In this paper, the motion of ballscrew and shape of workpiece are the main objective variables varying with load conditions. To verify feed mechanism in NC lathe, the monitoring system is designed and cutting condition variables are spindle speed depth of cut and feed. During machining, rotation number of ballscrew motion of ballscrew in direction to gravity center and cutting force are measured. After machining, the roughness of workpiece is measured.