Closed-die upsetting-extrusion process is a suitable method to forming this kind of component because component forme.

Taking the shaft of automobile gearbox as an example,a multi-step cold-forging technology for manufacturing the multi-diameter shaft on ordinary hydraulic presses by adopting open-die cold extrusion and close-die upsetting was stated.

Numerical Stimulation and Analysis on Defect in the Upset-extruding Process of Hollow Products;

By the analysis and comparison of upsetting extrusion and cold forging technology,the upsetting extrusion technology on the countersunk square neck bolt is introduced in the paper.

Based on summing up different kinds of technological process of precision forging of spur gear,a new upsetting extrusion process and pattern die are designed.

For a heavy forging with bulge,the upsetting-extruding process can be adopted.

Owing to the disadvantages of the traditional process of austenitic stainless steel neck flange with a large hole,a new upsetting-extruding process with tubular billet was presented.