Stamping elbow is first used in the forming process of batch production of seamless elbow, elbow in the production of common specifications has been hot forming process or other alternatives, but in some specifications of the elbow due to the production quantity and the wall thickness too thick or too thin.

Products have special requirements are still in use. The stamping of the elbow is formed by using the tube blank equal to the outside diameter of the elbow.

Before stamping, the tube blank is placed on the lower die, and the inner core and the end mould are filled in the tube blank, and the upper die downward movement begins to press down.

Compared with the hot stamping process, the appearance quality is inferior to the former; stamping elbow when formed outside the arc in tension, no other metal parts of excess compensation, so the outer arc wall thickness thinning of about 10%. However, due to the characteristics of the single piece production and low cost, the stamping elbow process is used for the manufacture of small batch and thick wall elbow.

Stamping elbow points cold stamping and hot stamping two kinds, usually based on the properties of materials and equipment selection of cold stamping or hot stamping.

The cold extrusion forming process is the use of special elbow bend forming machine, tube into the outer mold, lower mold clamping, driven by the push rods, tubes reserved along the inner mold and the external mold of the clearance and finish forming process.

The elbow made by cold extrusion technology of internal and external mold is beautiful, uniform wall thickness and small size, so it is used for stainless steel elbow, especially for stainless steel elbow. The precision of internal and external die used in this process is high, and the requirement for the wall thickness deviation of tube blank is also very strict.