Forming process of hot push elbow and cold extrusion elbow

Elbow is used for pipe bending, which accounts for a large part of all pipe fittings in the pipeline system, accounting for about 80%. At present, hot push, stamping and extrusion are commonly used forming process of seamless elbow. Hot push elbow forming process uses special bending press, core mold and heating device to push the blank into the mold and move forward under the push of push rod.

The forming process of hot push elbows

In the process of heating, expansion and bending, the deformation characteristics of hot push elbow metal material depend on the law of constant volume before and after plastic deformation of metal material. The diameter of tube blank is smaller than that of elbow, and the mandrel is used to control the deformation process of tube blank, so that the compressed metal flow at inner arc can compensate other parts of diameter expansion.

Stainless steel 304 butt welding 90 degee elbows

The forming process of cold extrusion elbow is to use a special elbow forming machine to put the tube blank into the outer die. After the upper and lower dies are closed, the tube blank moves along the reserved gap between the inner die and the outer die under the push of the push rod to end the forming process. The elbow made by cold extrusion process with inner and outer die has beautiful appearance, average wall thickness and small scale error. Therefore, the stainless steel elbow, especially the thin-walled stainless steel elbow, is made by this process. The precision of the die used in the stamping process of carbon steel elbow is high; The requirement of wall thickness error of tube blank is also strict.

Haihao Group manufacture elbow products more than 30 years,the products sells well all over the world for the high quality. If you have any question,please contact us!Email:sales@haihaogroup.com