A mold for preparing radial columns of permanent magnetic materials and its application method

Abstract

The invention belongs to the technical field of magnet material manufacture and discloses a mold for producing permanent magnet material radial columns and a using method thereof. The mold for producing the permanent magnet material radial columns comprises a primary template II (201), a secondary template II (207), an upper pressure head II, a lower pressure head II and a middle block (206); not less than two round chambers (205) are formed in the middle position of the middle block; two ends of the middle block are provided with protruding bodies (204); U-shaped grooves (208) are symmetrically formed in the primary template II and the secondary template II; the protruding bodies are respectively arranged inside the U-shaped grooves; the upper pressure head II and the lower pressure head II are solid column bodies with diameters slightly smaller than those of the round chambers. The mold for producing permanent magnet material radial columns and the using method thereof have the advantages of enabling pressed magnet column surfaces to be smooth without performing grinding to remove edges, meanwhile enabling no hidden cracks to be generated on the magnet column surfaces, enabling sound of produced motor to be small and being convenient to produce the magnet columns with a same diameter and different lengths and high in processing efficiency due to the fact that the pressing process does not need isostatic pressing and repeated mold disassembling.

Description

technical field [0001] The invention relates to a mold for preparing radial columns of permanent magnetic materials and a method for using the same, belonging to the technical field of magnetic material manufacturing. Background technique [0002] Compared with traditional motors, rare earth permanent magnet motors have the advantages of high efficiency and low noise. At the same time, they can be used for stepless speed regulation in conjunction with electronic controllers. Therefore, they are widely used in electronic products such as currency counters, washing machines, refrigerators, and air conditioners. field. As an integral part of the motor rotor, the market demand for radial columns is also rising. [0003] The principle of the traditional horizontal pressing method to make radial columns is to rotate the axially magnetized cylindrical mold by 90°, and use single-mode one / single-mode two-column pressing. Traditional molds such as figure 1 , figure 2 with imag...

AI Technical Summary

Problems solved by technology

[0005] (1) Due to the pressure of the press and the force and reaction force of the pressure head in the mold when the mold is closed, the prepared radial column has small dark cracks in the direction of magnetization, and the sample is easy to crack;

[0006] (2) After sintering, the surface of the radial column is not smooth, and there are two 0.5-1.2mm ribs in the direction of magnetization, which wastes magnetic powder and is not conducive to the later grinding process;

[0007] (3) When the mold is closed, the upper and lower pressures are inconsistent, resulting in uneven density of the compact, and finally uneven magnetic flux density of the magnet, resulting in a large deviation of the two poles of the magnetic field, exceeding 200Gs, and the sound is loud after being made into a motor;

[0008] (4) When the traditional mold is sintering the magnetic column, the isostatic pressing time is long, the magnetic column is in contact with the air for a long time, and the oxygen content increases;

[0009] (5) The traditional mold cannot flexibly adjust the length of the radial column. When the length of the prepared radial column changes, a new mold needs to be replaced;

[0010] (6) When using traditional abrasive tools to press the magnetic column, it is necessary to repeatedly disassemble and assemble the mold, and the production efficiency is low

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