Research of conical die bulging based on finite-element simulation;

Solution to the bulging problem in the open die cold extrusion for slpine shaft and relevant photoplastic theoretical study;

The workmanship and operation flow of the punching straight thread joint is introduced, including the process in a factory.

Methods and FE Simulation of Improving Quality of Upsetting;

Compare and Analyse of Unit Deforming Force and Boundary Conditions in Model Element of Cylinder Upsetting;

Study on the law of temperature influence on brass upsetting microforming;

Engineering application of the upsetting straight thread bar’s connection technique;

Effect of annealing temperature on microstructure and transverse ductility of upset pure Mo bars

The deformation extent of metal decreases from top to bottom along longitude direction during upset and changes into cylinder,accumulating deformation exists during processing,the shape phenomenon is not observed and the ove.