Fracture Prediction of 304 Stainless Steel Bar with Continuous Rotary Bending Low-stress Precision Cropping

Low-stress blanking near-net forming method is a new technology for manufacturing shaft parts blank, which has the characteristics of low energy consumption, high cropping efficiency and high cross-section accuracy. However, its cropping mechanism has always been unclear, and it is difficult to obtain ideal cropping process parameters. Therefore, the prediction fracture model, which is the fracture strength factor, is proposed based on cumulative damage theory. Taking 304 stainless steel as the research object, the fracture strength factor is coupled to the finite element model of continuous rotary bending low-stress cropping to predict the fracture. Through the continuous rotary bending low-stress cropping tests, relying on the comprehensive evaluation index of section flatness and cropping time, the correctness of the numerical simulation of continuous rotary bending low-stress cropping fracture prediction based on the fracture strength factor is verified. The results show that the fracture position simulat