Heat treatment method and die for special-shaped leaf spring

Heat treatment method and die of special-shaped leaf spring,

1. It is to heat the whole leaf spring with straight positioning pin hole to 900 ℃,

2. Use a bending die to press the positioning pin heat-treated at room temperature into the positioning pin hole, and pre-compress the leaf spring into shape.

3. Then put the leaf spring kept at 850°C into the quenching chuck for shaping.

4. Put the shaped leaf spring into the oil tempered product as a whole; the positioning pin has a positioning cylinder at one end, and a cylindrical step and an inner conical step at the other end; the mold is the upper mold with a convex mold, and the lower mold is between the lower mold and the concave mold. It is provided with a spring ejector rod, and a pressure pin positioning seat is arranged outside the ejector rod.

Because the positioning pin and the leaf spring material are different, the thermal expansion and contraction principle is used to make the expansion and inlaid matching, and the product quality is guaranteed; the composite mold is used to complete the production of the bending and pressing pins at one time, which is convenient and easy to use. The cost has improved the efficiency.