OMMON QUESTIONS IN USING SCREW AND NUT MOLD:
1.Mold and structural design experience with the master, not calculated the number of cold heading,
analyzing the force of the mold deformation than the unreasonable distribution.
 
2.The cleanliness of the mold, the inner hole finish is not enough.
 
3.The rigidity of shell sleeve material, the heat resistance,and the heat treatment hardness are
unreasonable.
 
order to save the cost of production, they selected poor quality tungsten carbide steel and wire rod,
alloy specifications and steal material nailing serious wheels unreasonable.
 
5.They collider in unsuitable way, without replacing lubricants and checking machine long-term.