Study on Hexagonal Flange Bolt by Net Shape Forming

• Main Authors: Chen, Yi-Song, 陳義松
• Other Authors: Tzoy, Gow-Yi
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/91722645931067248411

碩士 === 高苑科技大學 === 機械與自動化工程研究所 === 100 === Hexagonal flange bolt is the second popular bolt in usage compared to hexagonal bolt. It has been generally used in the parts assembly for automotive and motorcycle industries. The advantages are as below: the bearing surface area gets bigger after locking, the clamping force gets distributed, and the stability of the clamping part is higher. The study is mainly to improve the traditional cold multi-stage forming of hexagonal flange bolt, with a view to reaching the goal of near-net-shape forming the forming method of each pass to produce hexagonal flange bolt without flash is replanned. Tool life can be extended, the production costs can be saved, and the product competition can be enlarged. The “SolidWorks” and “Deform 3D” software under condition of the constant shear friction are used to design and simulate the optimal forming process, the forging force loading of each pass, the effective stress, effective strain, the velocity field, and appearance dimensions for each pass can be analyzed, besides an actual experiment is performed to compare with the appearance dimensions of FEM to verify the feasibility of simulation for FEM analysis. The simulation and experimental results show that the near-net-shape forming for hex flange bolts is feasible. Comparing to the traditional way, the new forming method reduces material loss 7%, no flash is generated, 15% percentage of the forging load is reduced, the die life is improved, the production equipment maintenance cost is decreased, furthermore the product quality is improved and the competitiveness is promoted.