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A Control Method for Improving the Single Weight Consistency of NdFeB Green Body

A control method and NdFeB technology, applied in the control field, can solve the problems of powder weight fluctuation, low consistency, large single weight deviation of NdFeB green body, etc.

Active Publication Date: 2021-07-06
NINGBO YUNSHENG MAGNET DEVICES TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods can control the weight of NdFeB powder in the feeding device to a certain extent, there is always a difference between the NdFeB powder supplemented in the feeding device and the consumption (the actual value of the green body unit weight) , long-term accumulation will lead to fluctuations in the weight of the powder in the feeding device, which will inevitably affect the density of the NdFeB powder filled into the mold cavity, and eventually lead to a large deviation in the single weight of the NdFeB green body obtained by compression molding. sex is still not high

Method used

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  • A Control Method for Improving the Single Weight Consistency of NdFeB Green Body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: A control method for improving the single weight consistency of NdFeB green body. First, set the upper limit of powder storage in the vibrating feeding device and set the initial parameter value in the main control module, and then under the control of the main control module The feeding device transports the NdFeB powder stored in it to the vibrating feeding device, so that the NdFeB powder in the vibrating feeding device reaches the upper limit of powder storage, and then the main control module controls the vibrating feeding device to enter the feeding stage , in the feeding stage, the vibrating feeding device periodically feeds the feeding device, and the main control module adjusts the vibration of the vibrating feeding device in the next feeding cycle according to the feeding time of the previous feeding cycle and the real-time value of the single-mode powder weight. signal until the amount of NdFeB powder in the feeding device reaches the set value, ...

Embodiment 2

[0030] Embodiment 2: This embodiment is basically the same as the embodiment, and the difference is as follows:

[0031] In this embodiment, the initial parameter values ​​set in the main control module include: the initial vibration signal X of the vibrating feeding device 1 , vibration signal adjustment reference value ΔX, vibration signal adjustment coefficient μ, single-mode powder weight m 1 , powder weight tolerance n 1 , single-mode blanking time preset value T 0 and blanking time trigger signal amplitude T 1 ;Initial vibration signal X 1 It is 1 / 2 of the vibration signal when the vibration feeding device is output at full load, the vibration signal adjustment reference value ΔX is 1% of the vibration signal when the vibration feeding device is output at full load, and the vibration signal adjustment coefficient μ is greater than 0 and less than or equal to 5 Arbitrary constant, single-mode blanking time preset value T 0 Equal to the single-mode cycle time, determi...

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Abstract

The invention discloses a control method for improving the single weight consistency of NdFeB green bodies. The main control module controls and adjusts the output signal of the vibration feeding device in real time according to the powder weight and powder feeding time of the powder weighing device, so as to realize the control of the vibration feed. The precise control of the vibration amplitude of the feeding device and the powder feeding speed reduces the weight difference of NdFeB powder entering the feeding device, reduces the density difference of NdFeB powder in the mold cavity, and obtains NdFeB powder by weighing after each pressing The actual value of the single weight of the iron-boron green body is fed back to the main control module. The main control module controls and adjusts the height of the cavity filler in real time to make up for the difference in the density of NdFeB powder in the cavity caused by the cumulative error in the feeding device, ensuring that the two Consistency of single mold weight, so as to eliminate the problem of poor consistency of green body single weight caused by poor fluidity of NdFeB powder and accumulated errors in feeding devices; the advantage is that in the case of high production efficiency, It can reduce the single weight deviation of NdFeB green body and improve its single weight and size consistency.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for improving the uniformity of the single weight of an NdFeB green body. Background technique [0002] The NdFeB production process is a typical powder metallurgy process, in which the forming process mainly depends on the forming press, and its function is to use the automatic feeding system to fill the NdFeB powder into the cavity composed of the lower pressure head and the female mold In the orientation magnetic field, the NdFeB powder in the mold cavity is turned into a block green body by mechanical force in the orientation magnetic field, which is the most critical part in the preparation process of NdFeB magnet blanks. The NdFeB powder is automatically The feeding system and molding press constitute the NdFeB molding system. The existing NdFeB powder automatic feeding system usually includes a feeding device, a vibrating feeding device, a powder weighing device, a fee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/00
CPCB22F3/005
Inventor 吴盼盼刘志敏史存杨联方
Owner NINGBO YUNSHENG MAGNET DEVICES TECH
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