High pressure molding is a plastic process that uses liquid pressure to make a workpiece. It reduces weight and saves material in aircraft, spacecraft, and automobilesCompared with the traditional stamping process, hydraulic forming process to reduce weight, reduce the number, and the number of mold parts to improve the rigidity and strength, reduce the production cost and has technical and economic advantages in the industrial field, especially in the automotive industry has got more and more applications. In the automotive industry and aviation, aerospace and other fields