How does Shenzhen Donglai Precision Mold Factory improve the manufacturing process of injection molds and reduce heat treatment defects in injection mold manufacturing
Some defects generated during heat treatment in injection mold manufacturing:
The causes of deformation and cracking, low or uneven hardness in injection mold manufacturing, rough and unsafe internal organization in injection mold manufacturing, decarburization, corrosion, soft spots and other defects on the surface of injection mold manufacturing are disorderly. However, by grasping the causes and adopting corresponding methods, heat treatment defects in injection mold manufacturing can be reduced and controlled. Generally speaking, the primary heat treatment defects in injection mold manufacturing can be avoided by the following methods:
1. Reasonable material selection is necessary for the manufacturing of injection molds. For the manufacturing of large injection molds, high-quality and hardenable mold steels should be selected. For mold steels with severe carbide segregation, reasonable casting and quenching and tempering heat treatment should be carried out. Solid solution dual refinement heat treatment can be applied to larger and non castable mold steels.
2. The design of the injection mold manufacturing structure should be reasonable, the shape should be symmetrical, the thickness should not be too wide, and the threaded holes should be set reasonably. Cut off injection molds with decarburization before heat treatment. Before quenching and heating, the rust spots on the surface of injection mold manufacturing should be eradicated and cleaned.
3. Injection mold manufacturing requires pre heat treatment of molds with high demand to eliminate residual stresses generated during mechanical processing.
4. Vacuum heating should be used as much as possible in the manufacturing of injection molds. When heating in an air resistance furnace, a protective atmosphere or method should be used; When using a salt bath furnace for heating, the composition of the salt bath should be strictly controlled and timely deoxidation and slag removal should be carried out. After the salt bath is heated and cooled, the co slag on the surface of the injection mold manufacturing should be promptly eliminated.
5. Reasonable selection of heating temperature for injection mold manufacturing, control of heating speed and insulation time, and timely inspection of furnace temperature surface.
6. On the premise of ensuring the hardness of injection mold manufacturing, it is necessary to choose quenching media with suitable cooling functions as much as possible, and to use pre cooling, graded cooling quenching, or isothermal quenching techniques as much as possible.
7. According to the shape and size of injection mold manufacturing, the correct furnace loading method (such as furnace loading method and furnace loading orientation, try to avoid the mold being close to the resistance wire and salt furnace electrode) and correct cooling operation method can effectively reduce the occurrence of heat treatment defects.
After quenching in the manufacturing of injection molds, timely tempering should be carried out, and the tempering should be sufficient.
