The deformation feature of the hot push bend is to determine the diameter of the tube billet according to the law of invariable volume before and after the plastic deformation of the metal material. The diameter of the tube billet used is smaller than the diameter of the bend, and the deformation process of the billet is controlled by the core mold, so that the inner arc is compressed. Metal flow, Compensation to other areas thinned by diameter, resulting in a uniform wall-thickness elbow
