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A method and device for realizing powder compaction by radial and axial electromagnetic forces

An electromagnetic force and axial technology, applied in the field of powder compaction, to achieve the effects of reducing discharge energy, increasing compaction density, and increasing density

Active Publication Date: 2020-04-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned patent, there will be an obvious density gradient after the powder is pressed.

Method used

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  • A method and device for realizing powder compaction by radial and axial electromagnetic forces
  • A method and device for realizing powder compaction by radial and axial electromagnetic forces
  • A method and device for realizing powder compaction by radial and axial electromagnetic forces

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Embodiment Construction

[0031] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0032] Such as figure 1 As shown, the present invention is a device for realizing powder compaction by radial and axial electromagnetic forces, including a base 1 and an upper fixing plate 2 , and the upper fixing plate 2 is connected to the base 1 by bolts 3 and nuts 4 . There is a sleeve 10 on the base 1, the bottom of the sleeve 10 is provided with a spacer 13, and the outer layer of the sleeve 10 is provided with a solenoid coil 11, and the solenoid coil 11 applies diameter to the powder 12 in the sleeve 10. to the electromagnetic force.

[0033] The top of the sleeve 10 is provided with a flat coil 5, the flat coil 5 is fixed on the lower surface of the upper fixing plate 2, and the solenoid coil 11 is snapped into the groove of the base 1, so as to ensure that the solenoid coil 11 will not move in the radial direction. Movement occurs. ...

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Abstract

The invention provides a method and a device for realizing powder pressing through a radial electrometric force and an axial electromagnetic force. Powder is pressed simultaneously or in a staged modethrough the radial electromagnetic force and the axial electromagnetic force, the radial electromagnetic force is realized by adopting a solenoid coil, a pulse current is fed into the solenoid coil,a pulse large current and a pulse electromagnetic force are generated on metal powder in an induction mode, sintering is realized through the heat effect generated by the pulse large current, and themagnitude of the pulse electromagnetic force is changed, so that the metal powder can alternately generate elastic deformation and elastic recovery, oxide between the powder is broken, the friction force is reduced, and finally the compaction density is improved. The pulse large current can generate a thermal effect, so that the metal powder and the oxide are melted, the sintering is realized, andthe density of a pressed part is further improved.

Description

technical field [0001] The invention belongs to the technical field of powder compaction, in particular to a method and a device for realizing powder compaction by radial and axial electromagnetic forces. Background technique [0002] In the production of powder metallurgy parts, powder compaction is an important link. It is to process the powder body into a part or a blank to be sintered with a certain size, shape and certain density and strength. The level of its technology affects the degree of material densification. This in turn has a major impact on the dimensional accuracy and mechanical properties of the finished part. There are many methods of powder compaction, the more common ones are dry pressing, isostatic pressing, injection molding and so on. These methods basically mix metal powder or ceramic powder with binder to form a uniform feed, and then obtain metallurgical products with a certain density by pressing, but these methods have low molding efficiency, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/087B22F3/03
CPCB22F3/03B22F3/087
Inventor 崔晓辉喻海良王青山
Owner CENT SOUTH UNIV
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