NdFeB permanent magnets are widely used in various fields due to their excellent permanent magnet properties. Among them, the bonding process (bonded NdFeB) is also widely used in motors, sensors, electrical appliances, power tools, etc. This process can both To prepare permanent magnets with excellent performance, high molding flexibility and easy multi-pole magnetization, the following is the process flow of bonding NdFeB permanent magnets.
1. Raw material preparation NdFeB magnetic powder: Select NdFeB magnetic powder with appropriate particle size and magnetic properties, and screen and mix according to specific requirements. Binder: Organic substances such as polyurethane resin are usually used as binders, and binders are added to the magnetic powder to provide bonding force. Mold: Design and make molds according to the shape and size of the product.
2. Mix ingredients
Mix NdFeB magnetic powder and binder evenly according to a certain ratio to ensure full dispersion of magnetic powder and binder.
3. Forming
Put the mixed magnetic powder and binder into a pre-designed mold, and then use equipment such as a press or injection molding machine to press or injection mold the magnetic powder and binder.
4. Curing
The formed magnet is cured by placing it under constant temperature and humidity conditions.
5. Surface treatment
In order to improve the corrosion resistance and mechanical properties of bonded NdFeB magnets, its surface is usually treated, such as plating, coating, etc.
6. Magnetization (magnetization)
Bonded NdFeB magnets are generally multi-pole magnetized (axial or radial multi-pole) and require a special magnetizing fixture.
7. Inspection and packaging
Conduct quality inspection on finished magnets, including measuring magnetic properties, appearance, dimensional inspection, etc.