On the die forging technics of the powder metallurgy high speed steel;

Research in the Process of Cuboid Heavy Forging;

Study on Healing of Interior Crack-type Fault in Heavy Forging by Modeling;

In order to control the microstructure of heavy forgings,an optimization method based on composite design and numerical simulation was proposed.

The Repairing Study for the Defects Inside the Heavy Forgings;

Microstructure of heavy forgings robust parameters control methodology based on taguchi method;

In order to control the microstructure and fracture of heavy forgings,a multiobjective optimization method based on numerical simulation was proposed.

According to the technology development of heavy forging and aiming to its practical application,the view of heavy forging mass fraction and its controlling,as well as the thoughts of morden comprehensive study have been introduced.

The main influencing factor on the friction state of heavy forging process has been analyzed,and the reasearch present status of common friction model in plasticity deformation has been summarized.

Cold rolls made of forged steel MC3 and MC5 with higher alloy contents have been successfully developed through using some special technolo- gies to control the alloy steel's inclusions,gas content,porosity and segregation,especially adopting a main measure like"forging in core-anvil".

The structural dimension of piston tail forging part and the key technology of die forging were analyzed in detail,then a three-step die forging process was determined which included blocker forging,finish forging and trimming.