Injection mold troubleshooting methods and skills summary

The more common faults of injection mold are dynamic fixed mold deviation, rod bending, fracture or leakage, poor cooling or water leakage, guide column damage and distance tension mechanism failure. Below we will be in view of the above more common faults for one by one.

1. Dynamic and fixed mold deviation

In the injection mold parting surface to add a high strength positioning key four sides of each, the most simple and effective is to use cylindrical key. The perpendicularity of the guide hole and the parting surface is very important. In the processing is the use of moving, fixed die alignment position clamping, boring machine after a time, so that can ensure the moving, fixed die hole concentricity, and the minimum error of perpendicality. In addition, the hardness of guide column and guide sleeve must meet the design requirements.

2. The ejector rod is bent, broken or leaked

The ejector rod should be re-milled, leaving a 10~ 15mm fit section at the front end of the ejector rod, and the middle part should be milled 0.2 mm smaller. All ejector rods must be strictly checked after assembly, generally within 0.05~0.08 mm, to ensure that the entire ejector mechanism can advance and retreat freely.

3. Poor cooling or water leakage

The design of cooling system, processing to the shape of the product, do not leave out this system because the injection mold structure is complex or difficult to process, especially large and medium-sized mold must fully consider the cooling problem.

4. The guide pole is damaged

The guide column mainly plays a guiding role in the injection mold to ensure that the core and cavity forming surface do not touch each other in any case, and the guide column can not be used as a force or positioning part. In the following two cases, the dynamic and fixed mold will produce huge lateral offset force during injection: when the wall thickness of the plastic parts is not uniform, the material flow rate is large at the thick wall, and the greater pressure is generated here; The sides of the plastic parts are asymmetrical, such as the stepped parting die, the opposite sides of the back pressure is not equal.

5. The distance tension mechanism fails

In the case of small suction force can be used to push out the method of fixed mold, in the case of large core pulling force can be used when the moving mold backward core sliding, first complete the core pulling action and then the mold structure, in the large injection mold can be used hydraulic cylinder core pulling.

Injection mold is a tool for the production of plastic products. It can be used to produce injection parts with complete structure and precise size. The structural form and processing technology of injection mold will directly affect the production efficiency and quality of injection parts. The mission of Fanstad is to master the core technology of injection molding production, communicate and analyze the technology before mold production with customers from the production needs of finished products, so that the mold delivery time is short, the life is long, the mass production is fast and the finished product quality is excellent! Have the need of injection molding mold welcome to contact us!