The cold drawn tube is drawn by a mold of a certain shape and size under the action of force. The dimensional accuracy and surface quality of the mold directly affect the dimensional accuracy and quality of the finished product.
Mold design should pay attention to the following aspects:
(1) The sizing size of the inner and outer molds should be determined considering the springback of the finished product after cold drawing. Generally, materials with low hardness and small deformation have low springback, while materials with high hardness and large deformation have high springback. Large amount of bullets;
(2) The surface of the mold should have lower roughness requirements, and the value is generally one to two levels lower than the finished product;
(3) The mold material is made of high-strength wear-resistant materials.