1) the main parts of the mold material problems, improper selection of material. Material performance is bad, do not wear; die steel not refined, with a large number of smelting defects; convex and concave die, forging instead of forging process is not perfect, the remains of a heat treatment risks.

2) the mold structure design problem, the die structure is not reasonable. There is no design and reinforcement device for the long and thin convex mould, the discharge port is not free, and the discharge capacity of the material is over.

3) molding process is not perfect, mainly in the convex, concave die forging billet internal quality is poor, heat treatment technology and process problems, resulting in convex, concave mold quenching, there are soft points and hardness. Sometimes produce micro cracks, or even crack, grinding and polishing is not in place, the value of surface roughness is too large.

4) no lubrication or lubrication but the effect is not good,