- Accept the mission statement. The mission statement for molding plastic molds is usually proposed by the part designer. Usually the plastic mold design mission statement is proposed by the plastic parts engineer based on the mission statement for molding plastic parts. The mold design engineer is responsible for the task of molding plastic parts. Design the mold based on the mold design brief and the mold design task book.
- Collect, analyze, and digest original data. Collect and organize information about part design, molding technology, molding equipment, mechanical processing, and special processing for use in designing plastic molds.
- Determine the molding method to use injection, extrusion, or pressing.
- Select molding equipment and design the mold according to the type of molding equipment. You must be familiar with the performance, specifications, and characteristics of various molding equipment.
During the injection processing and manufacturing, the injection mold will be heated, which can not only improve the precision of the injection mold, but also improve the use quality and precision of the workpiece. The heating of the injection mold is mainly divided into four links, namely the forging process, preparation Heat treatment, quenching and tempering, stress relief annealing.
- Forging process. This is an important link in the manufacturing process of injection mold working parts in injection mold processing and manufacturing plants. For injection molds of high-alloy tool steel, technical requirements are usually put forward for the metallographic structure of the material such as carbide distribution. In addition, the forging temperature range should be strictly controlled, correct heating specifications should be formulated, the correct forging force method should be adopted, and slow cooling or timely annealing after forging should be performed.
- Preparation for heat treatment. Depending on the materials and requirements of the injection mold working parts in the injection mold processing and manufacturing factory, preparatory heat treatment processes such as annealing, normalizing or quenching and tempering should be adopted to improve the structure, eliminate the structural defects of the forging blank, and improve the processing technology. Appropriate preparatory heat treatment of high carbon alloy mold steel can eliminate reticular secondary cementite or chain carbides, spheroidize and refine the carbides, and promote uniform carbide distribution. This is beneficial to the quality of quenching and tempering and improves the life of the mold.
- Quenching and tempering. This is a key link in the heat treatment of molds in injection mold processing and manufacturing plants. If overheating occurs during quenching and heating, it will not only cause greater brittleness of the workpiece, but also easily cause deformation and cracking during cooling, seriously affecting the life of the mold. When quenching and heating the die, special attention should be paid to preventing oxidation and decarburization, and the heat treatment process specifications should be strictly controlled. Vacuum heat treatment can be used when conditions permit. Tempering should be carried out in time after quenching, and different tempering processes should be adopted according to technical requirements.
- Stress relief annealing. Injection processing and manufacturingplants should perform stress relief annealing after processing parts of injection molds. The purpose is to eliminate the internal stress caused by rough machining to avoid excessive deformation and cracks caused by quenching. For molds with high precision requirements, they need to undergo stress relief tempering treatment after grinding or electrical machining, which is beneficial to stabilizing the accuracy of the mold and increasing its service life.
The quality of the injection mold needs to be judged by the mold trial results. There are some things that the mold tester must pay attention to when testing the injection mold. Otherwise, it will be difficult to do a good job in the injection mold. It is also difficult to test the mold. Control the quality of injection molds. So, what should we pay attention to when trying out injection molds?
There are 6 things that must be paid attention to when testing the injection mold:
- Pay attention to check whether the plastic raw materials in the barrel are correct. If the materials are incorrect, the effect of the mold trial may not be ideal.
- Pay attention to prevent bad glue or mixture from entering the mold, and ensure that the mold tube is clean and clean.
- Be patient when the mold is stable, and always pay attention to the changes when the mold is stable.
- Pay attention to adjusting the injection pressure.
- The time when advancing the screw shall not be less than the solidification time of the plastic on the gate. Avoid reducing the weight of injection molded products.
When trying out molds, try more, and pay attention to marking the respective production time, stabilization time, dimensions after cooling and other information, and calculate the pass rate of the molds at the same time.
