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Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force

A residual stress and pulsed electromagnetic technology, applied in the field of metal manufacturing, can solve the problems of difficult precise control, small action range and low efficiency, and achieve the effect of uniform force, easy control and reduction of residual stress

Active Publication Date: 2021-10-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects of the prior art, the object of the present invention is to provide a device and method for eliminating the residual stress of the workpiece by using pulsed electromagnetic force, aiming to solve the problems of low efficiency, difficulty in precise control, too small range of action and The problem of uneven processing area

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  • Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force
  • Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force
  • Device and method for eliminating residual stress of workpiece by using pulse electromagnetic force

Examples

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no. 1 example

[0059] figure 1 For the first embodiment of the device for eliminating the residual stress of the workpiece provided by the present invention, figure 2 It is a top view of this embodiment. The device includes: bulging coil 1, coil frame 2, support frame 8, pulse power supply system 4, magnetic collector 5, upper and lower end plates 6, fixing screw 7, support frame 8, driving workpiece 10, limit ring 11, sliding groove 12, steel support sleeve 13.

[0060] The metal workpiece 3 to be processed is covered with the bulging coil 1, and the pulse power supply system 4 is used to discharge to the bulging coil, and a pulsed large current is passed through the coil, and a pulsed strong magnetic field is generated in the surrounding space, and then induced in the metal workpiece to be processed The eddy current is generated, and the interaction between the eddy current and the strong magnetic field in the space will generate a strong outward repulsive force, and the magnetic collec...

no. 2 example

[0068] Figure 6 The second embodiment of the device for eliminating the residual stress of the workpiece provided by the present invention includes: an expanding coil 1 , a coil frame 2 , and a magnetic collector 5 .

[0069] The pulse power supply 4 discharges to the bulging coil 1, passes a large pulse current in the coil, and generates a pulsed strong magnetic field in its surrounding space, and then induces an eddy current in the metal workpiece to be processed. Different from Embodiment 1, the metal workpiece in this embodiment is an irregular shape, therefore, the outer surface shape of the magnetic collector 5 is designed to be consistent with the inner surface shape of the metal workpiece, because the magnetic collector can make the magnetic lines of force along it The surface distribution of the coil can make the magnetic field generated by the coil evenly distributed in the metal workpiece, and the interaction between the induced eddy current and the strong magnetic...

no. 3 example

[0073] Figure 7 The third embodiment of the device for eliminating the residual stress of the workpiece provided by the present invention includes: a bulging coil 1 , a bobbin 2 , and a telescopic rod 9 .

[0074] The device is suitable for processing large metal workpieces. It uses a distributed coil structure and arranges multiple coils 1 inside the metal workpiece 3 to be processed. The pulse power supply 4 discharges each coil to generate pulse intensity in the space. The magnetic field induces eddy currents in the metal workpiece to be processed, and the interaction with the magnetic field will generate a strong Lorentz force, which will superimpose with the original residual stress to generate plastic strain and release the residual stress.

[0075] Due to the method of array coil arrangement, the production cost and use risk of a single large coil are reduced, and the strength requirements and volume of each coil are greatly reduced. By adjusting the arrangement, direc...

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Abstract

The invention discloses a device and method for eliminating residual stress of a workpiece by using pulse electromagnetic force, and belongs to the field of advanced manufacturing. The device comprises the to-be-machined metal workpiece, a pulsed magnet, a pulsed power supply and the like. According to the method, the pulsed magnet is discharged through the pulsed power supply, the magnet can generate a strong pulsed magnetic field after huge pulse currents are introduced, an eddy current is induced in the metal workpiece, then strong electromagnetic force is generated, original residual stress in the metal workpiece and the external electromagnetic force are superposed to generate plastic deformation, the residual stress is released, and due to factors such as an oscillation effect and a heat effect in the discharge process, after the external electromagnetic force disappears, the residual stress in the workpiece can be greatly reduced, so that the effect of eliminating, regulating and controlling the residual stress is achieved.

Description

technical field [0001] The invention belongs to the field of metal manufacturing, and more specifically relates to a device and method for eliminating residual stress of workpieces by using pulsed electromagnetic force. Background technique [0002] Residual stress exists widely in various metal components. Due to factors such as uneven plastic deformation, thermal process and chemical changes during processing, residual stress will inevitably occur, which will affect the mechanical strength, service life and structure of metal components. Stability, etc. have a great impact. The traditional methods of eliminating and regulating residual stress are mainly aging method and mechanical method. The aging method includes: natural aging, heat treatment aging, vibration aging, etc. These methods often take too long and will be accompanied by the temperature rise of the workpiece. , resulting in material softening and strength reduction; mechanical methods include: mechanical stret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/04C21D11/00
CPCC21D1/04C21D11/00Y02P10/20
Inventor 李亮唐英豪李潇翔刘海祥曹全梁赖智鹏韩小涛
Owner HUAZHONG UNIV OF SCI & TECH
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