Molded Magnets for Automotive Sensors
We are exporter of Molded Magnets for Automotive Sensors.
The polymer over molding also helps the magnet to be used for tight fit snap fit etc. kind of fitments over the mating parts
Due to the good wear & lubricating characteristic of these polymers, over molded magnets can be used where they can slide continuously on another shaft
Designers world wide have been able to use this over molding for some functional purpose by molding of gears, cams or shafts in the plastic material itself
Minimum Order Quantity: 10000 order
Injection molded magnets are available using ferrite, neodymium-iron-boron, SmCo and SmFeN, offering thus a wide range of magnetic properties. Binder types include Nylon 6, Nylon 12 and PPS. The different combinations of binders and magnetic alloys offer a wide range of application temperatures from -40°C up to 160°C.
The Injection molding process is particularly well suited to molding complex shapes and thin walled parts. This opens entirely new possibilities in design of magnets and magnetic systems, making thin rings, mechanical non-magnetized details etc. possible. More over, the magnet can be molded over a metallic or polymer component (insert molding) or molded over with a normal plastic, thus manufacturing an entire assembly in one or two process steps.
Permanent magnet powder and polymer are first kneaded together to form a compound, which then can be used for injection molding. Injection molding of permanent magnets is basically identical with injection molding of normal plastics. The only difference is that for production of anisotropic magnets a magnetic field is needed in the molding tool. After molding the magnets normally do not need any further operations, except magnetising, before use. In certain cases magnets can be magnetized in the molding tool and separate magnetizing is thus not needed.
Depending on the orientation of the magnet, there are differences in the molding process:
1. Isotropic magnets (no magnetic field in the tool): NdFeB, ferrite
2. Anisotropic (axial, diametral, radial) by electromagnet(s) in the tool: Ferrite, NdFeB, SmCo, SmFeN
3. Polar anisotropy, generated by permanent magnets in the tool: Ferrite