Definition of In-Mold Injection Molding – In-Mold Insert Injection Molding Decoration Technology, or IMD (In-Mold Decoration), is to inject heated and melted plastic or metal materials into inserts of other materials that have been placed in the molding mold through an injection molding machine. The process of inlaying two or more different materials together through plastic.
In the motor or sensor industry, it is usually used to injection mold plastic magnets and shaft cores or stator cores together. The equipment used includes vertical injection molding machine or horizontal injection molding machine. Commonly used materials include ferrite, NdFeB, SmFeN and other magnetic powders mixed with thermoplastic resins such as PA6, PA12, PPS and other additives, and are produced by injection molding with a special injection molding machine. .
The integral injection molding of the magnetic core and the rotating shaft not only reduces the labor cost required for the assembly structure, but also has unparalleled advantages in terms of assembly strength. The strength of the integral injection molding product is more than twice that of the ordinary glue-bonded rotor. The high-strength structure ensures that the rotor can run stably for a long time under severe working conditions, and the dimensional accuracy and production efficiency of the product are improved.
In the injection molding process of the motor rotor, the magnetic steel can be divided into magnetic and non-magnetic. Without magnetism, that is, the post-integral magnetization process is to complete the overall assembly of the rotor, then complete the dynamic balance, and then perform the overall magnetization and magnetic detection. If the overall magnetization is adopted, the magnetic steel will not be magnetized during injection molding, and the temperature will have no effect on the magnetic steel. If magnetized magnetic steel is used for in-mold injection molding, it is necessary to consider the influence of the material selection of the magnetic steel, the injection temperature and the time of injection molding on the magnetic steel. We have a lot of experience in this area.
In-mold injection molding process steps mainly include six stages:
1. Put the insert into
2. Filling
3. Holding pressure
4. Cooling
5. Mold opening
6. Demolding
For in-mold injection molding of the rotor, the life cycle of the injection rotor and mold material selection, the structural accuracy of the rotor, the number of mold cavities, and the processing cost of the mold should be fully considered before the mold is opened. In the design of the runner, it is also necessary to consider whether the customer allows the use of recycled materials and injection molding. The price advantage of the rotor. In addition, before magnets or other inserts are placed in the mold, the anti-rotation design and pull-out force of the motor rotor must be fully considered to avoid failure of the high-speed motor.
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