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die casting법을 이용한 중형 상용차 V-arm제품의 피로내구 평가 연구
조규춘(Kyuchun Cho),김한철(Hanchael Kim),김용관(Youngkwan Kim) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
In this paper, we evaluated the fatigue and durability performance of a V-arm that supports the axle of a commercial vehicle and is subjected to vibration or shock load from the road surface. The V-arm is designed to have high strength in order to prevent damage due to vibration and impact load considering the use environment of the product. Therefore, the weight of the product also increases, which is one of the obstacles to the weight reduction of the vehicle. In order to lighten the V-arm with the above characteristics, the product was molded using the die casting method. The die casting method is widely used as a manufacturing method capable of producing complex shapes at a high speed. The shape of the V-arm is relatively small, but the size and thickness of the product are larger and thicker than those of the general die casting, making it difficult to develop the product. It is necessary to develop the production technology and evaluate the fatigue load technically. In order to evaluate the reliability of the product using the high vacuum diecasting technique, fatigue analysis was carried out using fatigue limit test and ANSYS n _Code Design Life using samples obtained from the developed product.
황택주(Taekju Hwang),조규춘(Kyuchun Cho),신행우(Hangwoo Shin),심기중(Kijoong Sim),유오성(Ohsung Yu) 한국자동차공학회 2016 한국자동차공학회 지부 학술대회 논문집 Vol.2016 No.4
In this study, We are represented the several test methods of the insulated boom for aerial work platform. The static strength tests of insulated boom were used the 100kN linear actuator and evaluated the insulated boom’s structural strength. Also, strength tests was conducted the static loading conditions given by the displacement control method. To investigate the strain characteristic of insulated boom, the strain gauge was attached the four position(150, 500, 1000, 1500 mm length from the fixed end) and strain data was acquired. As a result, we could be known that insulated boom’s braking strength was the 4000 kgf and boom’s strain was the same from the tension and compression data acquired the top and bottom surface of the boom. In addition, to evaluate the validity of the CAE analysis results, test results were compared to the analysis results.
문홍주(Houngju Moon),하만호(Manho Ha),조규춘(Kyuchun Cho) 한국자동차공학회 2018 한국자동차공학회 지부 학술대회 논문집 Vol.2018 No.5
This paper suggests how to improve fatigue strength of the drive shaft, which is the vulnerable part of the drive shaft system for the 3.5ton commercial vehicle. Drive shaft is composed of the university joint with spider and yoke, yoke shaft and so on. Improvement of drive were selected shaft inner/ outer yoke shaft spider. Four cases were considering design variables such as length and thickness of spider of drive shaft, fatigue analysis was conducted. Finally, we suggest that be improved drive shaft.