Chongqing Great Wall Technology Co., Ltd. is one of the leading manufacturers and suppliers of injection molded magnets parts in China, also supports customized service. Welcome to wholesale high quality injection molded magnets parts for sale here from our factory.
A variety of ferrite powders, nylon 6, nylon 12, polypropylene, and other resins can be combined to create ferrite-bonded magnets through injection molding. There are numerous classes available based on magnetic performance, temperature resistance, and mechanical strength, as there are countless possible ratios between magnetic particles and resins. These materials can be molded directly over or into a metal or polymer component. The possibilities for magnetization patterns are limitless, either in the molding tool or using a magnetizing fixture, allowing for various shapes and sizes. The tables below include a few popular grades, but we can formulate any required grade of magnetic material based on the customer's specifications.
Injection molded magnets are available using ferrite, neodymium-iron-boron, SmCo, and SmFeN, offering a wide range of magnetic characteristics. Examples of binder materials include nylon 6, nylon 12, and PPS. The application temperature can vary from -40°C to 150°C, depending on the binder and magnetic alloy combinations.
The injection molding method allows for the molding of complex shapes and thin-walled items. This means that magnets and magnetic systems can now include thin rings, mechanically non-magnetized details, and more. Additionally, the magnet can be insert-molded over a metallic or polymer component, or it can be molded over with regular plastic, allowing for the production of the full assembly in one or two processes.
Manufacturing
In the injection molding process, a compound consisting of permanent magnet powder and polymer is used. Permanent magnet injection molding is similar to the injection molding of everyday polymers, with the only difference being the requirement for a magnetic field in the molding tool to produce anisotropic magnets. After casting, the only additional process often required is magnetizing the magnets before use. In some cases, magnets can be magnetized within the molding tool, eliminating the need for additional magnetization.
The molding process varies depending on the magnetic orientation:
1. Isotropic magnets (tools with no magnetic field): ferrite and NdFeB.
2. Anisotropic magnets (axial, diametral, radial) created by electromagnet(s) in the tool: Ferrite, NdFeB, SmCo, SmFeN.
3. Polar anisotropy generated by permanent magnets in the tool: Ferrite.
Magnetic Properties
Advantages
- Complex forms can be achieved.
- Good tolerances can be achieved.
- NdFeB, Ferrite, SmFeN, and other diverse materials can be used without the need for further assembly procedures during overmolding or insert molding.
- Hybrid versions, such as Ferrite+NdFeB, can be created with combined properties.
Applications
Injection molded magnets are primarily used in automation equipment, such as DC motor rotors, inverter air conditioner rotors, stepper motor rotors, cooling fan impeller rotors, water pump motor rotors, mechanical buzzers, micro speakers, and other motor plastic magnetic rotors.
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