With the demand of lightweight automobile,the comprehensive performance of automobile parts is required in the process of strength improvement During the cold bending process of automobile beam steel,the steel will crack because of inclusion,stress concentration and coarse grain.In this paper,a comprehensive analysis of the microstructure and mechanical properties of the steel plate is made on the cracking problem of the automobile parts during the cold bending process,according to the production process on the spot,the reason of the automobile beam steel cracking in the cold forming process is analyzed,and the production process is optimized to avoid the cracking.The results show that the main cause of the cracking is the burr in the process of shearing,and the second is the ra-dius of the round corner of the die.
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