Large-central-angle magnetic shoe forming upper die and large-central-angle magnetic shoe forming method

Abstract

The invention discloses a large-central-angle magnetic shoe forming upper die and a large-central-angle magnetic shoe forming method. The large-central-angle magnetic shoe forming upper die comprises a forming upper die body, the lower end face of the forming upper die body is provided with an inwards-concave arc-shaped face, the top of the forming upper die body is provided with a main water storage cavity, and the main water storage cavity is externally connected with a vacuum negative pressure pipeline; a left branch water storage cavity and a right branch water storage cavity are formed in the positions, located below the main water storage cavity, of the upper die body, the left branch water storage cavity and the right branch water storage cavity are not directly communicated with the main water storage cavity, and the main water storage cavity, the left branch water storage cavity and the right branch water storage cavity communicate with the lower end face of the upper die body 1 through a plurality of vertical small drainage holes, the left branch water storage cavity and the right branch water storage cavity are located above an arc left tail end and the arc right tail end of the arc face respectively. The large-central-angle magnetic shoe forming upper die and the large-central-angle magnetic shoe forming method further comprises the large-central-angle magnetic shoe forming method, the problem that the two sides of the arc of the magnetic shoe forming green body with the inner arc central angle larger than 145 degrees are prone to cracking can be solved, the forming yield of the large-central-angle magnetic shoe is greatly increased, and the method can adapt to the full-automatic magnetic shoe forming process.

Description

technical field [0001] The present invention relates to a large central angle magnetic tile forming upper die and a large central angle magnetic tile forming method. Background technique [0002] The permanent magnet ferrite magnet tile is the excitation component of the permanent magnet motor, and the production of the permanent magnet ferrite magnet tile usually includes the following processes: [0003] (1) Wet-grind the raw material into a slurry with a particle size of about 1 μm, and the water content of the slurry is in the range of 34%-38%; [0004] (2) The slurry is injected into the mold cavity, and the hydraulic press presses the slurry in the mold cavity under the condition of strong magnetic field orientation. Most of the water in the slurry is discharged through the filter cloth, and the slurry is dehydrated and formed into a green tile. ; [0005] (3) The magnetic tile green body is sintered at high temperature into a magnetic tile blank; [0006] (4) The m...

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Problems solved by technology

[0011] There is also a technical method to artificially paste plastic tapes on the filter cloth positions corresponding to points A and E to suppress water drainage when points A and E are formed, thereby reducing the density of the green body at points A and E with the largest compression ratio. From the production test According to the results, this method can achieve a certain positive effect in reducing the cracking rate at points A and E. However, since the filter cloth is prone to shift during the forming process, the pasted tape is often not aligned with the target position, and frequent manual adjustments are required.

In addition, with the promotion of the automatic forming process, the position of the filter cloth will be moved for a certain distance every time the number of presses is pressed during the forming process, and the problem of tape position deviation is more serious.

[0012] Based on the above reasons, the current inner arc center angle is greater than 145 degrees for magnetic tiles (see attached image 3 ) production costs remain high

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