Process Flow Hot Push Forming

The hot push elbow forming process uses a dedicated elbow pushing machine, core mold, and heating device to move the billet on the mold forward under the push of the pushing machine, and is heated, expanded, and bent into shape during the movement. The deformation characteristic of hot pushed elbows is to determine the diameter of the pipe blank based on the law of constant volume before and after plastic deformation of the metal material. The diameter of the pipe blank used is smaller than the diameter of the elbow. The deformation process of the blank is controlled by the core mold, allowing the compressed metal at the inner arc to flow and compensate for other parts that have been thinned due to expansion, thus obtaining an elbow with uniform wall thickness.
The hot push elbow forming process has the characteristics of beautiful appearance, uniform wall thickness, and continuous operation, which is suitable for mass production. Therefore, it has become the main forming method for carbon steel and alloy steel elbows, and is also applied in the forming of certain specifications of stainless steel elbows.
The heating methods for the forming process include medium frequency or high-frequency induction heating (the heating circle can be multiple or single circles), flame heating, and reflection furnace heating. The heating method used depends on the requirements of the formed product and the energy situation.