Research On The Effect Of Process And Material Parameters On Multi-Pass Conventional-spinning

Modern spinning technology, an advanced plastic forming process widely used in aerospace and military industry, has become an important shaping method for flexible manufacturing of small-lot rotary thin shells. To ascertain the process and material parameter' s influencing law to the process of multi-pass conventional spinning is a key problem urgently to be solved for the development of spinning technology. So, in this dissertation, the process and material parameter' s influencing law to the process of multi-pass conventional spinning is investigated based on the Elasto-plastic dynamic FEM under the ABAQUS/Explicit software environment. A brief introduction to the project and its main results are as follows:According to the forming feature of multi-pass conventional spinning process, a practical 3-D FEM model based on ABAQUS/Explicit is established. The dependability of this 3-D FEM model is validated by means of compare simulation results with experimental results, and the simulation results agree well with the experimental results. And it provide the foundation of research on the process and material parameter's influencing law to the process of multi-pass conventional.The results show: in the process of multi-pass conventional spinning, the thinnest place of the blank lies in the place contact with mandrel roundness in the first time, then, with the forming process, transfer to the place contact with punch, and feed ratio has a reverse influence on them.Based on the ABAQUS/Explicit software environment, the effect of process parameters to multi-pass conventional spinning is obtained by using the established 3-D FEM model: when feed ratio and punch roundness are larger, the blank is easily wrinkled. The thick blank is difficulty wrinkled, but the blank thinning is larger and result in a low forming precision.Research on the effect of material parameter on multi-pass conventional spinning shows: material with larger Harden coefficient is suitable to conventional spinning process. Material with larger Yield stress is easily wrinkled. Material with larger Youngs modulus is easily fracture. All of this results provide a reference for the choice and optimization of processparameters and material of spinning.