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Hierarchically-controlled electromagnetic incremental forming method

A progressive forming and electromagnetic technology, which is applied in the field of parts forming and manufacturing, can solve problems such as instability and wrinkling, and achieve the effects of suppressing thinning, improving the precision of electromagnetic progressive forming, and smoothing the surface

Active Publication Date: 2015-12-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the effect of instability and wrinkling during use

Method used

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  • Hierarchically-controlled electromagnetic incremental forming method
  • Hierarchically-controlled electromagnetic incremental forming method
  • Hierarchically-controlled electromagnetic incremental forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] As shown in Figure 1, the specific implementation process of the example of the present invention is:

[0039] (1) Place the sheet material 1 to be formed on the first layer of the die 4 and press it with the binder ring 2; drive the forming coil 3 down until the forming coil 3 moves to the position where it is in contact with the sheet material 1 to be formed; Through charging and discharging, a pulse current is generated in the forming coil 3, and at the same time, an eddy current in the opposite direction is induced on the sheet 1 to be formed. Under the action of the Lorentz force, the sheet 1 to be formed deforms at a high speed.

[0040] The forming coil 3 located in the head of the progressive forming machine tool provides a power source for electromagnetic forming.

[0041] (2) After forming once, the forming coil 3 moves to a designated position according to a preset trajectory for the next discharge forming; and then moves to the next designated position for discharg...

Embodiment 2

[0050] Such as figure 2 It is a schematic diagram of the first layer before discharging. The method of forming the first layer can be one-time forming with a larger-sized coil, such as image 3 Shown. The large-sized forming coil 3 provides a large electromagnetic force range, which can form a large range at a time, but the cost is higher and the forming quality cannot be guaranteed. After the first layer is formed, the subsequent forming and orthopedic processes are continued.

Embodiment 3

[0052] The implementation method of the forming of the first layer may be multiple forming with a smaller-sized forming coil 3, such as Figure 4a , As shown in 4b. Figure 4a Is a schematic diagram of a discharge, Figure 4b In order to move the coil to the designated position for the second discharge after one discharge, the forming quality of sheet metal 1 can be improved by two or more discharges. After the first layer is formed, the subsequent forming and orthopedic processes are continued.

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Abstract

The invention discloses an electromagnetic incremental forming method. The electromagnetic incremental forming method adopts a hierarchical manner to realize layer-by-layer forming from the bottom up; only a local position is formed during each forming, so that a die fittingness range is expanded continually till the forming of a whole workpiece is completed; then shaping is realized to improve the forming quality of a sheet; finally, a housing part which is uniform in thickness distribution and good in surface quality is obtained. Shaping can be realized through an orthotic coil or the orthotic coil and a magnet collector. According to the method, after hierarchical forming, the fluidity of sheets is improved, and a local thinning phenomenon is prevented; meanwhile, a sheet waving phenomenon, which is caused by instability wrinkling, in an electromagnetic incremental forming process can be prevented, so that the electromagnetic incremental forming precision is improved; as the fluidity of the sheets is improved after hierarchical forming and the local thinning phenomenon is prevented, the forming of housing parts with uniform wall thickness is facilitated.

Description

Technical field [0001] The invention belongs to the field of parts forming and manufacturing, and in particular relates to an electromagnetic progressive forming method. Background technique [0002] Electromagnetic forming is a high-speed forming method that uses magnetic field force to deform metal blanks. It has the advantages of simple tooling, no lubrication in the process, and high product precision. Especially, it has shown an increasingly broad application prospect in aluminum alloy sheet forming. [0003] At present, the main manufacturing methods of large-scale shell parts are spinning and hydroforming. The cost of equipment required for spinning forming is high. However, hydroforming is through the production of spherical lobes and then tailor welding. After forming, the residual stress of the workpiece is large, which cannot meet the requirements of aerospace demand. [0004] At present, the application of electromagnetic forming technology in sheet metal is mainly refle...

Claims

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Application Information

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IPC IPC(8): B21D31/00
Inventor 李建军刘贤龙黄亮莫健华汪志强龚航洪秀冬
Owner HUAZHONG UNIV OF SCI & TECH
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