Maximum and minimum critical rates of deformation in open die extrusion are discussed on the basis of the slip field theory and the upper bound theory of plane state plastic deformation.

Research on experiment of size prediction of thick-walled tube without mandrel by open-die cold extrusion;

Research on improving prediction accuracy of maximum reduction by open-die cold extrusion;

Analysis of process parameter of open-die cold extrusion with upper-bound method

Maximum reduction when deep tine taper hole part is formed by open-die extrusion is defined.

In the paper, maximum reduction when deep tine taper hole is formed by open-die extrusion is defined.

In the paper, the forming limit was depicted by analysis of the deep tine taper hole is formed by open-die extrusion.

Six types of Ag-Cu-Zn alloy solder can be developed by means of melting of graphite crucible furnace and the processes such as steel form pouring→extrusion blooming→annealing→tension→acid washing→tension.

Since the method of extrusion blooming before rolling is a efffective way to deform the metal with poor formability, it is very important to carry on a deep research on this method.

A new type of structure of closed extrusion dies with locking hooks is put out.

A new type of structure of closed extrusion dies for fuel injector bodies without flash is presented.