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프리폼 형상이 딮드로잉 제품의 코너충진 정도에 미치는 영향
박준홍(Joon Hong Park),김승규(Seung Kyu Kim),백승걸(Seung Kul Baek),박영철(Young Chul Park) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In deep drawing processes, the wall thickness in the sheet metal forming always decreases which causes lots of dimension problems. In this paper, the decrease in wall thickness at the corner was minimized through the newly developed preform shape and it was found that the wall thickness increased in a certain degree. The calculated distribution of the wall thickness after forming was in good agreement with the experimental results. The effects of the corner radius and the preform shape on the decrease in wall thickness at the inner corner were examined by both FEM simulation and experiment.
박준홍(Joon-Hong Park),전언찬(Eon-Chan Jeon),김태호(Tae-Ho Kim),김형백(Hyung-Baek Kim) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.4
Cropping metal materials is widely used for feeding processes of various forming method, such as forging, extrusion, drawing, and upsetting. However, cropping has many weak points, which are material loss in part of cutting, chip creation, and much use of lubrication oil, etc. In this study, instead of cropping, a novel process is proposed to cut metal materials, especially stainless steel bar which is known very difficult to crop. Results of FE-analysis will be shown to verify the proposed method comparing with those of the conventional cropping process. Also, fitting products were successfully forged using the fabricated billet by the proposed process.
다구찌기법을 이용한 선박용 커넥팅로드 예비성형체의 최적 설계
박준홍(Joon-Hong Park),강정호(Jung-Ho Kang),하민수(Min-Soo Ha),김승규(Seung-Gyu Kim),최성규(Seong-Gyu Choi),백동규(Dong-Gyu Baek),박영철(Young-Chul Park) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.4
In this paper, propose an optimal design to improve the mechanical efficiency of gate valve made by forging method. In order to design the experiments using table of orthogonal array and optimization design is conducted as application of real response model to Taguchi method based approximation model using computer simulation. Also, from verification of the response model with optimized results was confirmed that usefulness and reliance of application Taguchi method to structural optimum design using finite element analysis and equation.