Study on Flange Bush Forming

• Main Authors: Ching-Wei Shih, 施經緯
• Other Authors: 鄒國益
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/76040705696542948672

碩士 === 高苑科技大學 === 機械與自動化工程研究所 === 100 === The study uses Deform 3D FEM analysis software to simulate the new product development, and propose the analysis of various possible forming plans. This study carries out the realistic cylinder compression to obtain the flow stress, and performes really the ring compression to get the frictional factors between the dies and forged materials in forming to simulate with. Deform 3D FEM analysis software. And the tension test of rod has been carried out to obtain the critical damage value (CDV) combining with Cockcroft & Latham and Normalized Cockcroft & Latham damage ctcriteria. The optimization of parameters assembly has been obtained by Taguchi method with orthgonal table L9(34) to adjust the shapes and dimensions of punch and die, and do the confirmation simulation analysis to obtain the optimal parameters assembly. The realistic multi-stage forging has been performed to realize the effective stress, the effective strain, the velocity field and the multi-stage forging force and.compare the product dimensions with the simulation results to verify the acceptance of FEM analysis model. The similarity has been reached over 95%. Furthermore, the tungsten steel materials made from the power metallurgy are difficult to bear the circumferential tensile stress which easy to cause the mold kernel fracture. Therefore, with a view to understanding the die stress distributions, especially explore the radial stress, circumferential stress and the effective stress of mold kernel, mold form and stress ring occurred by single mold form interference fit and stress ring interference fit. The effect of the interference on the circumferential stress has been understood, and aslo whether the effective stress occurred exceeds the allowable yield strength of die material to avoid the die failure. The study proposes a series of simulation investigations and experiment verifications as the forging industry reference.