How can I reduce the size of the mold cavity?
In terms of the difficulty of the work, it will be much easier to choose to “repair weld” and “grind” on the moving mold than on the fixed mold.
Because the quality of the cavity surface of the injection mold directly affects the appearance of the plastic part, and there is a large amount of heat generated in the welding process, when there is no sufficient process measures to ensure it, these heats often change the structural composition of the cavity surface, resulting in different hardness of the cavity surface, and then affect the appearance of the plastic part, and the modification of the cavity surface of the model should be avoided as much as possible in practice.
The general steps for modifying the cavity surface of a moving model are as follows:
1. Through the method of gluing on the cavity surface, the thickness of the cavity that needs to be increased or decreased is roughly obtained.
2. Implement “repair welding” and “grinding” operations.
3. Try the mold again and adjust the size of the cavity surface according to the molding effect.
The second step is the difficulty and the key, the following is the detailed process of cavity surface repair:
1. Select the welding material that matches the base metal, determine the welding range, reserve and protect the grinding benchmark.
2. Alternate surfacing welding in partitions, be careful not to weld from head to tail, so as not to cause cracks on the cavity surface of the mold caused by internal stress.
3. Start grinding according to the reserved benchmark, and pay attention to the protection of the surrounding relevant parts.
4. Measure the height of the repair welding surface, and after reaching the requirements, weld the reference vacancy to the full, and complete the modification of the cavity surface.
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