Base on the method of numerical simulation,both free cold forging and opened cold forging of shaft with boss were analyzed.

The computing formula of the two technology data,that is the technology deforming data “n” and every deforming degree “ε hn ”,can be deduced from the basic definition formula of the free compression deforming degree,its application method is mentioned.

Analysis of process of crankshaft of bolt combined automatic cold header in the lathe;

Research on ductile fracture criteria and the application in cold heading process;

To introduce trial production course of ML08Al wire rod for cold heading from 150 mm×150 mm continuous casting billet.

Adopting the method of combining the Oyane Ductile Fracture Criteria with Finite Element Analysis(FEA) to analyze the deformation course of inner hexagonal bolt with 35K steel,the position for hexagonal bolt head to be easy broken and the cause are discussed,the crazing situations of inner hexagonal bolt in cold heading are forecasted,the results accord with practical breaking situation.

Design method for improving cold upsetting mould service life by lining technology;

On the basis of the analysis of the difficulties for forming the eccentric shaft by cold upsetting, the measures for solving the problem of material flow instability and the improvements in the structure of the die were proposed.

The design of cold upsetting process is usually carried out by an experienced designer from his own expertise, existing designs and the process rules.

Quality improvement of low carbon cold-heading wire for screw nut;

This paper introduced a green process method of miniature electrical machinery axle,which breaked through the traditional process method: it changes the turning both ends half a ball face for cold-heading,and becomes the outer circle to grinding to cold-drawing.

In this paper the chemical composition, strength and ductility of the steel were investigated according to the crack phenomenon in the 45# cold-heading wire cord steel.