In terms of the difficulty of the work, it is much easier to choose "repair welding" and "grinding" on the moving die than on the fixed die.
Because the quality of the fixedmoldcavity surface of the injection mold directly affects the appearance of the plastic part, and there is a lot of heat generated in the welding process. Without sufficient process measures, these heat often change the structure and composition of the cavity surface, resulting in different hardness of the cavity surface, thus affecting the appearance of the plastic part. In practice, the modification of the mold cavity surface should be avoided as far as possible.
The general steps to modify the cavity surface of the moving model are as follows:
The thickness of the cavity needs to be increased or decreased is roughly obtained by pasting glue on the cavity surface.
Carry out "repair welding" and "grinding" operations.
Try the mold again and adjust the dimension of the cavity surface according to the forming effect.
The second step is the difficulty and key. The following is the detailed process of cavity surface repair
Select welding material matching with base metal, determine welding range, reserve and protect grinding datum.
In order to avoid the internal stress causing the crack of the mold cavity surface, it should be avoided to weld from the beginning to the end.
According to the reserved benchmark, start grinding, and pay attention to the protection of surrounding related parts.
Measure the height of the repair welding surface, after meeting the requirements, weld the reference vacancy to complete the modification of the cavity surface.
