There are many difficulties in fabrication of steel tension rods with high tension strength and large diameter, such as the forging of the rod end,heat-treatment and surface painting etc The main technologies in the erection of the rods are: assembly and connection for the screw during the period of construction,the tension of steel rods to be processed, the seal for the connection of the screw.

New technology and essentials in die design for upsetting drill key on a universal press was introduced.

This article has described and analyzed the several upsetting forging methods of large-middle size continuous grain flow crankshaft in detail,and presented the advantages and disadvantages of different methods,meanwhile the development direction of the forging method for the large-middle size continuous grain flow crankshaft has been set forward as well.

The influences of tube dimension and interface friction on the material flow and the cause of forming defect in the flange forming process by upsetting forging tube are analyzed.