Due to the technological limitation of magnetic field orientation process, sintered magnet is difficult to achieve the shape and dimensions of practical application at once, therefore, machining process of blank is inevitable. Chinese magnet manufacturers fully learned the processing superiority from ceramic and crystal industry, then taken processing levels to extremes. Rare earth permanent magnets made by powder metallurgy are typically hard and brittle cermet material, there are only cutting, punching and grinding can be utilized to the machining process of the rare earth permanent magnet among conventional processing technology. What about special shaped magnet?
About Special Shaped Magnet
Special shaped magnet has irregular shape and mainly serve to specific demands. With the development of consumer electronics to the functional complexity and miniaturization, permanent magnet which often works as a key component is also required to adopt this trend. Irregular shaped magnets are mainly limited to special Neodymium magnets and special Samarium Cobalt SmCo magnets. The machining process of irregular shaped magnet is much more complex than conventional shape magnet. Thus often requires combining several different processing technology.
New update in 2021: Laser Cutting
Besides lower processing efficiency, internal stress caused by conventional machining technology will generate a certain impact on microstructure and magnetic properties of sintered magnet. Ultrathin sintered Neodymium magnets in magnetic wireless charging devices have been experiencing an explosive growth from 2020. Magnet manufacturers tried every means to enhance capacity and cost performance, then laser cutting developed rapidly under this opportunity. Laser machining is to cut or weld workpiece by high power laser. For laser cutting, it has the merit of no contact, cutting force, and deformation in comparison with other frequently-used process technologies. In addition, laser cutting also has superior machining efficiency, accuracy, and quality. Laser cutting is relatively simple to use which need only to import cad drawings into equipment. Laser cutting has become a new selection to machine special shaped magnet with thinner thickness.
