The relationship between molding defect and product failure of injection mold resin parts

Injection mold resin parts forming defects mainly include indentation, burr, welding lines and gaps, which will lead to various problems such as mechanical maloperation, mechanism maloperation, parts damage and parts strength reduction. The following Xiaobian will be a detailed description of the relationship between molding defects and product failures of injection mold resin parts.

1. Poor shrinkage of injection mold may lead to poor mechanical operation

The thickness of resin forming parts is thicker and will produce shrinkage, which is the phenomenon of forming a dent on the surface of the parts. If there is a dent in the sliding surface, it may lead to poor operation of the mechanism such as jamming. In addition, grease may accumulate in dents and become resistance, thus failing to perform the desired lubrication performance.

2. Poor burr of injection mold may lead to poor operation of the mechanism

If the injection pressure is high, the parting surface will produce burrs. Often, burrs can get stuck in other parts and cause them to malfunction. In addition, if the burr detaches and falls into the mechanism, it may cause various faults such as abnormal noise, so special attention is needed.

3. Bad welding line of injection mold may lead to damage of parts

The flow of resin in injection moulds can sometimes cause resin joints, which can lead to a poor appearance, but can also cause other serious failures. If the oil or agent is attached to the joint where the stress is concentrated, it will become the starting point of solvent cracking, and the parts will be prone to cracks.

4. The gap of poor injection mold forming may lead to the reduction of strength of parts

The gap is a problem that Xiaobian has had too much trouble with in the past. The void is due to the poor forming of the hollow part caused by the bubbles in the resin parts, which is difficult to be found through the conventional acceptance inspection. If there is a gap, the section modulus of the parts will be lower than the design value, unable to reach the original strength of the parts, may lead to the mechanism of poor operation. Since then, Xiaobian in parts acceptance inspection increased the "through cutting to confirm the gap".

The failure frequency of injection molding resin materials is higher than that of metal materials. By summarizing historical experience, we can determine the causes of failures and defects and learn the appropriate use of resin materials. The mission of Fanstar is to master the core technology of injection molding production, communicate and analyze the technology before injection molding with customers from the production needs of finished products, so as to make the injection mold delivery time short, long life, rapid mass production and finished product quality excellent! If you need injection molding, please contact us!