Studies On Optimization Of Drawing Process Of The Automotive Brake Bottom

This paper studies the automotive brake bottom developed by Wanxiang Qianchao(Guilin)Chassis Parts Co.,Ltd. As the automotive brake bottom is complex,large deformation,highly accurate, and stamping is very difficult, drawing is always prone to fracture or wrinkling phenomenon in the actual processing, which makes the part scrapped.The traditional process and mold design mainly rely on experience and die repeatedly amended,which leads to low production efficiency and wastes a lot of human, financial, material and time.In this paper,based on the deformation characteristics of the basic shape of parts on the drawing forming and the bulging forming, the forming properties of the automotive brake bottom are analyzed and the forming defects such as fracturing, wrinkling are studied.The original drawing process is simulated by the sheet metal forming numerical simulation technology, and then the drawing techniques is improved,which can eliminate the fracturing phenomenon. At the same time, the combination of uniform design method and numerical simulation is applied to analyze and optimize the blank holder cone angle of pre-forming , the pre-forming BHF, the friction coefficient that affect the forming quality of the automotive brake bottom.Finally, the theoretical analysis is validated by experiment and the experiment results show that improved drawing process is reasonable and feasible. What we did in the paper solves the inadequacy of the original drawing process of the automotive brake bottom developed by Wanxiang Qianchao(Guilin)Chassis Parts Co.,Ltd, eliminates the cracking, improve the quality of forming, decreases the production cost and shortens the product developing period.