Common problems and solutions in the injection molding process (1)

The application of metal insert injection molding is very wide, and it has an increasing role and influence in modern society. The precision core team has focused on precision metal stamping and metal insert injection molding for more than 30 years, and has rich experience in custom manufacturing. In terms of injection molding, there are mainly two parts: precision metal insert injection molding and precision injection molding. Next, we will analyze 10 common problems and solutions in the injection molding process for you. 1. When the product is just turned on, the product runs out of the front (flash), and the reason and solution for the lack of glue after a period of production. When the injection molding machine is just started, the melt in the barrel of the injection molding machine has a long heating time, low melt viscosity, good fluidity, and the product is easy to run off. After a period of production, the melt will continue to take away the heat, resulting in insufficient melt and viscosity. Large, poor fluidity, so that the product lacks glue. After a period of production, gradually increase the temperature of the material pipe to solve the problem. 2. In the production process, the product lacks glue, sometimes increasing the injection pressure and speed is invalid, why? After a period of production, the melt will continue to take away the heat, resulting in insufficient melt, high viscosity, and poor fluidity, making the product lack of glue. Increase the temperature of the material pipe to solve it. 3. The purpose of the product's acid resistance test. The acid resistance test of the product is to detect the internal stress of the product and the position of the stress point of the internal stress in order to remove the internal stress of the product. 4. Reasons and solutions for the easy cracking of metal inserts in the product. When inserts are placed in the product, internal stress will be formed when the melt glue meets the cold inserts during injection molding, which will reduce the strength of the product and make it easy to crack. During production, the inserts are preheated. 5. Reasons and solutions for product fragility. The product is easy to be brittle because the product uses too many nozzle materials and secondary materials to cause the product to be brittle, or the material stays in the material tube for too long, which causes the aging of the rubber and makes the product brittle. Increase the proportion of new materials and reduce the number of times that the nozzle material is recycled. Generally, it should not exceed three times to prevent the rubber material from staying in the material pipe for a long time. 6. Reasons and solutions for the prone to pan-fiber in glass fiber products. It is due to the low melt temperature or low mold temperature, and insufficient injection pressure, which causes the glass fiber to not be well combined with the plastic in the glue, causing pan-fiber to appear. Increase the melt temperature and mold temperature, and increase the injection pressure. 7. The influence of the temperature of the feed inlet on the product. Too high or too low temperature at the feed port will cause the machine to return unstable materials, make the feed volume unstable, and affect the size and appearance of the product. 8. Reasons and solutions for white spots in transparent products. Transparent products have white spots caused by cold glue in the product, or dust in the material. Increase the nozzle temperature, add cooling wells, and save the raw materials to prevent dust from entering. 9. Product deformation problem Product deformation is mainly caused by unbalanced heat shrinkage, or product deformation due to the internal stress of the product itself. 10. Importance of setting the loosening and retreating position If the loosening and retreating position is set too large, it will cause the return material to absorb oxygen, oxidize the rubber compound and generate bubbles. If the position is set too small, the pressure in the barrel will be high, and the shear force will be too high to decompose the rubber, and the nozzle will drool. The position error cannot exceed 0.4mm. [Related recommendation] Learn more: 精の corporate culture Learn more: Continuous improvement and innovation are the key factors for the survival of stamping companies Learn more: Why most stamping factories are unwilling to quote foreign trade companies