It has been put forward by experiment that the variation of wall thickness of tube is in directly propor-tion to outer-diameter ,inter-diameter,and (Rs-variation of tube area) during tube dieless upsetting.

In this paper, velocity field and variation of wall thickness are studiedtheoretically during tube dieless upsetting.

In the present paper, the transient temperature of the surface on the upsetting die and its inside has been measured with the film thermocouples developed by authors.

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.