This article provides detailed information on the magnet process, tools, and technology.
Common Tools for Magnet Processing
Magnet processing tools can be categorized based on the type of processing, such as cutting, grinding, drilling, and chamfering. Below are some common magnet processing tools:
Cutting Tools
| Multi-wire Cutting Machine: Utilizes high-speed friction from diamond wire to cut magnets, allowing multiple workpieces to be cut simultaneously. It has high efficiency and good verticality, making it ideal for mass production.
| Slice Machine: Used for cutting magnets into regular shapes, it relies on high-speed rotating diamond tools for cutting. It is suitable for samples or small batch production, but has relatively low efficiency and vertical control.
| Laser Cutting Machine: Uses a focused laser beam to melt and vaporize magnetic materials. This non-contact processing method is high in precision and can cut angled surfaces, but may produce gradient cross-sections when cutting thick products, and temperature changes might affect magnetic performance.
| Wire Cutting Machine: Uses a molybdenum wire electrode to create high-frequency electric sparks that melt the magnet. Suitable for cutting complex shapes (like tiles or irregular shapes) or large magnets, it offers high precision but a slower speed, and the cutting surface may affect magnetic properties.
Grinding Tools
| Surface Grinding Machines: Includes horizontal and vertical axis surface grinding machines, used for grinding the flat surfaces of magnets and capable of multi-surface processing.
| Double-Sided Grinding Machine: Simultaneously grinds two plane surfaces of the product using wheels from both sides, ensuring high precision and low surface roughness, commonly used for symmetrical flat processing.
| Centerless Grinder/Square to Round Machine: A centerless grinder is used for the external finish grinding of cylindrical blanks; the square to round machine shapes square magnetic steel bars into round ones.
| Internal and External Cylindrical Grinding Machine: Designed for grinding the inner and outer surfaces of ring products, it removes burrs and ensures dimensional accuracy.
| Form Grinding Machine: Can grind flat surfaces, curved surfaces, and complex-shaped surfaces, suitable for processing unusual products and chamfering.
Drilling Tools
| Bench Drill: Uses hard alloy tools for drilling through feed rotation, suitable for through holes, blind holes, or stepped holes in irregularly shaped products.
| Instrument Lathe: Secures magnetic steel with a clamp, using the spindle to rotate the workpiece while alloy tools perform drilling, suitable for precision drilling of cylindrical, ring, and small square-shaped magnets (hole diameter less than 5mm).
| Ultrasonic Drilling Machine: Utilizes ultrasonic vibrations to drive abrasive suspension for creating holes, ensuring high precision and efficiency, making it suitable for small hole processing.
Chamfering Tools
| Vibratory Chamfering Machine: Drives the friction between magnetic steel and abrasives through a vibrating motor, smoothing sharp edges and ensuring a flat surface.
| Drum Chamfering Machine: Places magnetic steel and abrasives into a sealed drum, utilizing the friction generated by rotating drums for chamfering, and is suitable for batch magnet processing.
These tools need to be selected based on the magnet material, shape, precision requirements, and production scale. During processing, temperature control is crucial to prevent damage to magnetic properties, and surface treatment should be applied to prevent corrosion.
Types of Magnet Processing
Magnet processing can primarily be categorized into mechanical processing and surface treatment.
Mechanical Processing
Cutting Processing
| Conventional Cutting: Utilizes a slice machine to cut cylindrical or rectangular magnets into circular or square sheets, suitable for mass production of standard shapes.
| Wire Cutting: Used for processing irregular or complex magnet shapes, allowing precise control over size and shape, commonly employed for unusual magnet processing.
Shape Processing
| Grinding Processing: Uses grinders to shape magnets into complex shapes such as tiles, fans, and grooves, especially for high precision requirements.
| Laser Processing: Employs laser cutting or engraving technologies to achieve high precision and complex shapes, especially for thin or small magnets.
Drilling Processing
| Counterbore Processing: Creates counterbores on magnets, commonly used for mounting or fixing magnets, such as the central hole in ring magnets.
| Straight Hole Processing: Drills straight holes in magnets for connecting functionalities or other requirements.
Surface Treatment
| Electroplating Treatment: Common electroplating materials include zinc and nickel coating, which enhance the corrosion resistance and oxidation resistance of magnets, extending their service life while improving appearance and surface hardness.
| Electrophoretic Treatment: An environmentally friendly surface treatment process that forms a uniform and dense coating with good corrosion resistance and insulation properties, commonly used for surface treatment of neodymium iron boron magnets.
| Spray Coating Treatment: Forms a protective coating on the surface of magnets through spraying, providing good corrosion resistance and wear resistance, suitable for magnets with high surface performance requirements.
These magnet processing methods can be combined based on the magnet’s material, shape, and application requirements to meet various customer needs.
Examples of Magnet Processing
| Cylindrical Magnets: Ranging from 2mm to 100mm in diameter and over 0.5mm thick, cylindrical magnets are easy to process, allowing single-step formation with fast magnet processing speed and shorter delivery time.
| Rectangular Magnets: These magnets take longer to process as six surfaces need cutting, requiring three processing steps compared to cylindrical magnets, making delivery times longer.
| Hollow Magnets: Before cutting, a predetermined central hole is drilled into the blank, followed by slicing and then counterbore processing.
Magnets Manufacturer
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