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A Layer Controlled Electromagnetic Progressive Forming Method

A kind of incremental forming and electromagnetic technology, applied in the field of parts forming and manufacturing, it can solve problems such as instability and wrinkling, and achieve the effect of suppressing thinning, high degree of mold sticking, and increased flow

Active Publication Date: 2017-04-26
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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  • A Layer Controlled Electromagnetic Progressive Forming Method
  • A Layer Controlled Electromagnetic Progressive Forming Method
  • A Layer Controlled Electromagnetic Progressive Forming Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0039] (1) Put the sheet material 1 to be formed on the first layer of the die 4, and press it with the blank holder 2; drive the forming coil 3 to move downward until the forming coil 3 moves to a position just in contact with the sheet material 1 to be formed; Through charge and discharge, a pulse current is generated in the forming coil 3, and an eddy current in the opposite direction is induced on the sheet to be formed at the same time. Under the action of the Lorentz force, the sheet to be formed is deformed at a high speed.

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

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

Embodiment 2

[0050] Such as figure 2 is a schematic diagram before the first layer is discharged, and the implementation method of the first layer forming may be to use a coil with a larger size for one-time forming, such as image 3 shown. The large-sized forming coil 3 provides a wide range of electromagnetic force, and can form a larger area at one time, but the cost is high, 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 forming the first layer can be formed by using smaller forming coils 3 multiple times, such as Figure 4a , as shown in 4b. Figure 4a is a schematic diagram of a discharge, Figure 4b It is a schematic diagram of moving the coil to the designated position for the second discharge after the first discharge, and the forming quality of the sheet 1 can be improved through 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 in the forming of aluminum alloy sheets, it has shown increasingly broad application prospects. [0003] At present, the main production methods of large shell parts are spinning and hydroforming. The equipment required for spinning is high in cost, while hydroforming is to make ball valves and then tailor welding. After forming, the residual stress of the workpiece is large, which cannot meet the requirements of aerospace. need. [0004] At present, the application of electromagnetic forming technology in sheet metal is mainly reflected in local small deformat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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