What should be paid attention to before operating metal powder injection molding technology?

What should be paid attention to before operating metal powder injection molding technology?

The metal powder injection molding process combines design flexibility with the strength of the metal, achieving a low-cost solution for complex geometric parts. As this is a new technology, sufficient preparation is required before operation to ensure the smooth completion of the work. Below is an introduction to the precautions before operating the metal powder injection molding technology.

In order to ensure the normal operation of metal powder injection molding and the quality of plastic parts, certain preparations must be made before metal powder injection molding. For example, conducting visual inspections of plastic raw materials, checking their color, fineness, uniformity, etc., and testing the technical performance of plastics as needed. For plastics with strong moisture absorption, such as nylon, polycarbonate, ABS, etc., sufficient preheating and drying should be carried out before molding to remove excessive moisture and volatile substances in the material, and to prevent defects such as bubbles and silver lines in plastic parts after molding.

2. In production, if it is necessary to change the variety and color of plastic, or if heat or order reduction reactions occur during the molding process, the material barrel of the injection molding machine should be cleaned. Usually, the stock of the barrel of a plunger injection machine is large, so it is necessary to disassemble and clean the barrel. The cylinder of the screw injection machine can be cleaned using the air injection method.

3. When using the air injection method to clean the spiral cylinder, when the forming temperature of the plastic to be replaced is higher than the forming temperature of the residual material inside the cylinder, increase the temperature of the cylinder and nozzle to the low forming temperature of the plastic to be replaced, and then add the material to be replaced with the plastic or its material, and continue air injection to eliminate all residual materials

4. If the molding temperature of the plastic to be replaced is lower than the molding temperature of the residual material in the material barrel, the temperature of the material barrel and nozzle should be raised to the molding temperature of the plastic to be replaced, the power should be cut off, the plastic to be replaced should be added, and continuous injection should be carried out until all residual materials are eliminated