Tel: +86-18573485932
E-mail: sales@tlmagnet.com
How to judge the quality of china ndfeb magnet
First of all, the guarantee of the performance of china ndfeb magnet comes from the control of the raw material production process.
First of all, the guarantee of the performance of china ndfeb magnet comes from the control of the raw material production process. According to the requirements of high-grade or mid-grade or low-grade sintered NdFeB, the raw materials are selected according to the raw material composition specified in the standard. Whether the ndfeb magnet production process is advanced or not directly determines the performance and quality of the magnet.
In terms of magnetic field orientation, China is the only country in the world that adopts two-step compression molding. It uses low pressure vertical compression molding during orientation, and finally adopts quasi-isostatic compression molding. This is one of the most important features of the china ndfeb magnet industry. In addition, the monitoring of the quality of the production process is very important, and it can be controlled by testing methods such as SC sheet thickness measurement and JM powder particle size distribution. The Chinese Academy of Metrology has successively developed various types of permanent magnetic material technology magnetic parameter measuring instruments.
Secondly, the guarantee of the size of china ndfeb magnet depends on the processing strength of the factory. The practically used neodymium iron boron permanent magnets have a variety of shapes, and the permanent magnets of each shape have different sizes, and it is difficult to form them at one time during the production process. The general production process is:
Produce large (large size) blanks→→sintering and tempering→→mechanical processing (including cutting and drilling)→→grinding→→surface plating (coating)→→testing (magnet performance, surface quality and size) Accuracy)→→Magnetizing→→Packing→→Factory.
1. Mechanical processing is divided into three categories:
Cutting process: cutting cylindrical and square columnar magnets into discs and squares;
Shape processing: processing round and square magnets into fan-shaped, tile-shaped or grooved or other complex-shaped magnets;
Punching processing: processing round bar and square bar magnets into cylindrical or square cylindrical magnets. Its processing methods include: grinding and slicing processing, electric discharge cutting processing and laser processing.
2. The surface of china ndfeb magnet is generally required to be smooth and reach a certain precision. The surface of the magnet delivered as a blank needs to be surface-grinded.
The common grinding methods for the square china ndfeb magnet permanent magnet alloy are:
Cube: surface grinding, double end grinding, internal grinding, external grinding, etc.
Cylindrical: commonly used coreless grinding, double-end grinding, etc.
Tile-shaped, sector-shaped and VCM magnets: use a multi-station grinder.
Thirdly, the quality of the china ndfeb magnet coating directly determines the application life of the product. According to the experiment, the permanent magnet of 1cm3 china ndfeb magnet will be completely oxidized and corroded if it stays in the air at 150℃ for 51 days. It is more susceptible to corrosion in weak acid solutions. In order to make the china ndfeb magnet durable, it is required to have a service life of 20-30 years, and it must undergo surface anti-corrosion treatment.
At present, the manufacturing industry of china ndfeb magnet generally adopts methods such as electroplating metal, electroplating + electroless metal plating, electrophoretic coating and phosphating treatment.
Electrophoretic coating has become one of the widely used anti-corrosion surface treatment technologies of china ndfeb magnet. Because it not only has a good bonding force with the surface of the porous magnet, but also has corrosion resistance such as salt spray, acid and alkali resistance, and excellent corrosion resistance. However, compared with spray coating, its resistance to humidity and heat is poor.
Tongli Magnetic Industry Co., Ltd.
Address：No. 5, Changfu Road, Ludong community, Humen Town, Dongguan City, Guangdong Province.
Contact:：kiara
Tel: +86-18573485932
E-mail: sales@tlmagnet.com
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