4. Grinding process
Thread rolling process: the cold upset blank thread, through the interaction between the movable tooth plate and the fixed tooth plate, to shape the tooth pattern.
5. Heat treatment process
In order to make the screw after cold heading to obtain higher hardness and strength
Realize self - tapping and locking of metal
Improve the mechanical properties of metal parts, such as torsion resistance, tension resistance, wear resistance
A. annealing (700 ℃ x 4 hr) : stretch the organization, the regular polygon.
C. Tempering heat treatment (do not add elements to the metal to change the internal structure of the metal with the change of temperature to obtain better mechanical properties)
6. Electroplating process
After electroplating the product surface may present the desired color effect and the surface anti-oxidation coating effect.
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