1) The problem of the material of the main working parts of the mold is improperly selected. The material performance is poor, not wear-resistant; the mold steel is not refined, and has a large number of smelting defects; the convex and concave mold, the forging blank forging process is not perfect, and there are hidden dangers of heat treatment.
2) The problem of mold structure design, the die structure is unreasonable. The slender punch has no design reinforcement device, the discharge port is not smooth, and the unloading force is too large, so that the punch is subjected to the alternating load.
3) The molding process is not perfect, mainly in the poor quality of the convex and concave die forging blanks, the heat treatment technology and the process have problems, causing the convex and concave die to be impervious, and there are soft spots and uneven hardness. Sometimes microcracks or even cracks occur, the polishing is not in place, and the surface roughness value is too large.
4) Unlubricated or lubricated but not effective,