The advantages of the forming process of large push elbow are mainly shown in the following aspects:  

(1)The blank of the elbow is flat or developable surface, so the cutting is simple, the accuracy is easy to ensure, the assembly and welding is convenient, the raw material is easily controlled in the processing, the manipulation is simple, there is no complicated process, and the welding and assembly is convenient.  

(2) Do not need pipe billet as raw material, can save the use of pipe equipment and mold, and can get any large diameter and relatively thin wall thickness push elbow.  The raw material of this push elbow is more special, do not need to add raw material of tube billet, easy to control when processing.  

(3) Can shorten the manufacturing cycle, the production cost is greatly reduced, suitable for the field processing of large push elbow.  The molding process of push elbow is complex, and it needs to be welded according to different materials and uses, and gradually formed under certain pressure.  The molding of push elbow needs to be carried out in accordance with a certain procedure, and the corresponding process process should be strictly complied with.  The basic process of forming technology of large push bend is as follows:  Welding a polygonal ring shell with polygon cross section or a polygonal fan shell sealed at both ends. When the internal pressure is filled with media, internal pressure is applied, and the cross section gradually becomes a circle from polygon under the action of internal pressure. This process is used in the production of different elbows and shows good use value in different fields.  So that the process has a good value in the production of different elbows.  

A circular ring SHELL can be cut into 4 90 degree elbows or 6 60 degree elbows or other elbows as required. This process is suitable for making large push elbows of any size with elbow middle diameter to elbow inner diameter ratio greater than 1.5. It is the ideal method for making large push elbows at present.  This process molding method is used in the production of different elbows, in different fields to show good use value, so that the process has a good value in the production of different elbows.