Bolt holder
A technology for anchors and bolts, which is applied in the field of bolt anchors and stud bolts, can solve the problems of inconvenience, time-consuming and laborious, mechanical inability to tighten, fix or loosen, etc., and achieve good adsorption, production cost and Improved processability, good remanence and coercive force
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Embodiment 1
[0047] According to the composition and mass percentage of the NdFeB permanent magnet material in Example 1 in Table 1, batching is carried out, and then melted into an ingot under the protection of argon in a vacuum induction furnace. After the ingot is roughly crushed, it is treated with hydrogen absorption in a hydrogen breaking furnace, and then dehydrogenated at 180°C. After cooling, it is mixed for the first time. Before mixing, a magnetic material grinding aid of 0.15% by weight of the raw material is added. Mix the powder for 30 minutes. After powder mixing, put the powder into the airflow mill for airflow milling, control the average particle size of the powder between 1-2μm, then add it to the powder mixing tank and add 0.8% of the raw material weight percentage of magnetic material lubricant for the second powder mixing 1 hour. After the second powder mixing, the powder is pressed into a U-shaped magnet with a magnetic field press and subjected to isostatic pressin...
Embodiment 2
[0049] According to the composition and mass percentage of the NdFeB permanent magnet material in Example 2 in Table 1, the ingredients were prepared, and then smelted into an ingot under the protection of argon in a vacuum induction furnace. After the ingot is coarsely crushed, hydrogen absorption treatment is carried out in a hydrogen breaking furnace, and then dehydrogenation treatment is carried out at 200 ° C. After cooling, the first powder mixing is carried out. Before the powder mixing, 0.19% of the weight percentage of the raw material is added to the magnetic material grinding aid. Mix the powder for 33 minutes. After powder mixing, put the powder into the airflow mill for airflow milling, control the average particle size of the powder between 2-3μm, then add it to the powder mixing tank and add 0.95% of the raw material weight percent lubricant for the second powder mixing for 1.5 hours . After the second powder mixing, the powder is pressed into a U-shaped magnet...
Embodiment 3
[0051] According to the composition and mass percentage of the NdFeB permanent magnet material in Example 3 in Table 1, batching is carried out, and then melted into an ingot under the protection of argon in a vacuum induction furnace. After the ingot is roughly crushed, it is treated with hydrogen absorption in a hydrogen breaking furnace, and then dehydrogenated at 220 ° C. After cooling, the first powder mixing is carried out. 35min. After powder mixing, put the powder into the airflow mill for airflow milling, control the average particle size of the powder between 3-4μm, then add it to the powder mixing tank and add 1.0% lubricant accounting for the weight percentage of raw materials for the second powder mixing for 2 hours . After the second powder mixing, the powder is pressed into a U-shaped magnet with a magnetic field press and subjected to isostatic pressing. The isostatic pressing pressure is 220MP, and then sintered in a vacuum sintering furnace at a temperature ...
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