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Method for adjusting shapes and performance of plates under combined action of prestress and pulse electromagnetic force

A technology of pulsed electromagnetic and combined action, applied in metal processing, metal processing equipment, manufacturing tools, etc., to achieve the effect of improving energy utilization, prolonging action time, and optimizing material properties

Inactive Publication Date: 2016-03-30
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, at present, there has not been a comprehensive research method based on pulsed electromagnetic force for the shape and performance of metal sheets with a certain initial prestressed state at home and abroad.

Method used

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  • Method for adjusting shapes and performance of plates under combined action of prestress and pulse electromagnetic force
  • Method for adjusting shapes and performance of plates under combined action of prestress and pulse electromagnetic force
  • Method for adjusting shapes and performance of plates under combined action of prestress and pulse electromagnetic force

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0067] The shape adjustment and tonality method of the plate under the composite action of prestress and pulsed electromagnetic force of the present invention, for large metal plates, such as figure 1 As shown, it is specifically realized by the following methods:

[0068] Step 1: Clamp and fix the front and rear sides of the sheet in the X-axis direction through the clamping mechanism.

[0069] Step 2: Set the front end of the sheet over the mould.

[0070] Step 3: Place the solenoid over the front end of the sheet.

[0071] Step 4: Establish a finite element mechanical analysis model.

[0072] The finite element mechanical analysis model including mold, blank holder and plate is established by finite element software.

[0073] Step 5: Preload the plates;

[0074] Preload the sheet by pre-stretching, pre-bending, or applying pre-stretching and pre-bendi...

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Abstract

The invention discloses a method for adjusting the shapes and the performance of plates under the combined action of prestress and pulse electromagnetic force. The method comprises the steps of firstly clamping and fixing the plates and enabling the plates to be located above a die; arranging electromagnetic coils above the plates; carrying out preloading on the plates and establishing a finite element mechanical analysis model for obtaining the stress and strain distribution relationship of the plates; exerting the pulse electromagnetic force on each area of the plates through the electromagnetic coils by controlling the movement of the plates and the movement of the electromagnetic coils; obtaining the stress and strain distribution relationship of the plates again, judging the stress-strain state of the plates, and unloading the plates for carrying out rigidity and strength tests if the stress-strain state meets the expectation state; carrying out regional shape adjustment on the plates if the stress-strain state does not meet the expectation state. The method has the advantages that for the metal plates with certain initial prestress, traditional mechanical force and the pulse electromagnetic force are combined, through the impact waves generated by the pulse electromagnetic force, the interior structure of material is changed, and the interior stress-strain state of the plates is adjusted.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming. Specifically, it is a method for adjusting the shape and tone of a plate under the combined action of pulse electromagnetic force on prestress and pulse electromagnetic force with a certain initial prestress state. Background technique [0002] The sudden discharge of the electricity stored in the capacitor will generate a strong and short magnetic field near the electromagnetic coil connected in series. When the magnetic field acts on the adjacent conductor, an eddy current opposite to the direction of the coil current will be generated on the conductor. The eddy current and the magnetic field together act on the Pulse electromagnetic repulsion of coils and conductors. [0003] Electromagnetic forming is a single-mode forming process based on the pulse electromagnetic force, also known as magnetic pulse forming, which is mainly used in the forming of thin-walled parts such as pipe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/14B21C51/00
CPCB21C51/00B21D26/14
Inventor 龙安林吴向东王文平方春平万敏
Owner BEIHANG UNIV
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