• 산업공학
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• 제4권2호
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• pp.81-92
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• 1991

A study showed that the two most important obstacles to assembly automation were that product designs are generally not assembly oriented and that most components cannot be handled automatically without problems. In the view of the importance of well designed product with high assemblability, a tool must be developed to pre-evaluate a product during design phase whether it can be assembled with minimum efforts. In this research, a prototype expert system for DFA has been developed that can be used to advise the designer of difficulties that his/her design presents for automatic handling during manufacture. This rule-based system has been implemented on an IBM personal computer, using the Texas Instruments' Personal Consultant Plus.

• 한국시뮬레이션학회논문지
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• 제25권2호
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• pp.83-92
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• 2016

공차란 각 부품들이 기구적으로 조립되었을 때 원하는 수준의 기능성을 확보할 수 있도록 각 부품의 기하학적 형상이나 위치에 대해 허용하는 치수의 변동량을 의미한다. 또한 공차해석이란 부품들이 조립되었을 때, 각 부품의 공차가 조립품에서 어떻게 누적되어 미치는 영향을 분석하는 일련의 절차를 의미한다. 만일 누적된 공차의 분산이 규정된 일정 수준의 범위를 벗어나면 조립품의 품질에 문제가 발생하기 때문에 당초 설정한 부품의 공차를 수정해야 하며, 이러한 과정을 공차설계라고 한다. 이 논문에서는 휴대용 의료기기의 설계단계에서 공차해석과 공차설계를 위해 몬테카를로 시뮬레이션 기법을 활용한 사례를 소개한다. 이러한 시뮬레이션 연구를 통하여 제품의 조립성과 기능성을 개선시킬 수 있다.

• 한국기계가공학회지
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• 제18권12호
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• pp.15-21
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• 2019

The worm reducer is capable of quadrature power transmission when the shafts are disposed at right angles to each other. Since a large reduction ratio can be obtained of up to approximately 1/100 and a sliding movement is performed during operation compared with other gears, the noise and vibration are small, and there is the advantage that reverse rotation can be prevented. On the other hand, severe wear and damage are displayed on the gear and worm tooth surface, and many defects, such as intense heat generation of the reducer, occur. In the reducer case, the four-piece casing method was selected to solve the problems of heat generation, transmission efficiency, and assemblability. In this paper, we analyzed the problems of the worm and worm wheel (the core parts of a 5-Ton worm reducer) and casing through these methods and researched how to solve them.