Electromagnetic pulse assisted progressive drawing method and device

An electromagnetic pulse boosting and incremental forming technology, which is applied in the field of material plastic forming, can solve the problems of unreasonable force state of deep drawing forming and single electromagnetic deep drawing forming height of drawing crack, so as to overcome the drawing crack defect and improve the forming limit. , easy to shape effect

Inactive Publication Date: 2016-01-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art such as unreasonable stress state of drawing forming, existence of drawing crack defects and shallow forming height of single electromagnetic drawing, the present invention proposes an electromagnetic pulse-assisted gradual drawing that can greatly increase the drawing limit Drawing forming method; the present invention also provides an electromagnetic pulse-assisted progressive drawing forming device

Method used

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  • Electromagnetic pulse assisted progressive drawing method and device
  • Electromagnetic pulse assisted progressive drawing method and device
  • Electromagnetic pulse assisted progressive drawing method and device

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Experimental program
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Effect test

Embodiment 1

[0055] Such as Figure 2-4 Shown is the electromagnetic pulse-assisted progressive drawing forming device of the present invention, including a punch 1, a die 9, a blank holder 3, a drawing coil 2, three booster coil groups and a power supply system; the punch 1 Matched with the die 9, the drawing coil 2 is embedded in the die 1; the blank holder 3 is movably arranged on the die 9 and is located on the periphery of the die 1, and is used to press the blank 7 to be formed on the die 9; die 9 is fixedly installed on the base 8. Of course, the base 8 may not be provided in the present invention.

[0056] Each booster coil group includes an upper booster coil and a lower booster coil corresponding to the upper and lower positions. In this embodiment, the first upper booster coil 6 and the first lower booster coil 12 form the first booster coil group. The second upper booster coil 5 and the second lower booster coil 11 constitute the second booster coil group, the third upper boo...

Embodiment 2

[0061] Using the electromagnetic pulse-assisted progressive drawing forming device described in Embodiment 1, the method for drawing and forming specifically includes:

[0062] First, place the blank 7 to be formed between the blank holder 3 and the die 9, at this time the blank 7 to be formed is located at the initial blank position 7-1, the lower end of the punch 1 is located at the first punch position 1-1, Keep the edge of the blank 7 to be formed aligned with the inner edges of the first upper booster coil 6 and the first lower booster coil 12, as Figure 9a Shown; Charge the energy storage capacitors of the first power supply subsystem 13-1, the fourth power supply subsystem 13-4, and the fifth power supply subsystem 13-5 respectively, and when the charging voltage reaches the forming voltage, disconnect the charging circuit; Simultaneously close the switches in the first power supply subsystem 13-1, the fourth power supply subsystem 13-4, and the fifth power supply subs...

Embodiment 3

[0064] Such as Figure 5 Shown is the electromagnetic pulse-assisted progressive drawing forming device of the present invention, which includes a punch 1, a die 9, a blank holder 3, a drawing coil 2, three booster coil groups and a power supply system. Except for the power supply system, its structure is exactly the same as that of the first embodiment, and will not be repeated here.

[0065] The power supply system includes a plurality of power supply subsystems, namely the first power supply subsystem 13-1, the second power supply subsystem 13-2, the third power supply subsystem 13-3, and the fourth power supply subsystem 13-4. Each power supply subsystem includes a power supply, an energy storage capacitor, a voltage divider resistor and a switch connected in series in sequence.

[0066] The drawing coil 2 is connected to the first power supply subsystem 13-1, and after the first upper booster coil 6 is connected in series with the first lower booster coil 12, it is conne...

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Abstract

The invention provides an electromagnetic pulse boosting type gradual deep drawing forming method. The electromagnetic pulse boosting type gradual deep drawing forming method comprises the steps that a sheet to be formed is placed between a female die and a male die; performing is conducted and the sheet to be formed is pressed into the female die, wherein the sheet to be formed is located at the bottom of the male die; electromagnetic force is applied to the portion, located at the bottom of the male die, of the sheet to be formed, and the sheet to be formed is pushed downwards; electromagnetic force is applied to the periphery of the sheet to be formed, the sheet to be formed is pushed to the center of the female die, and the sheet to be formed is made to flow into the female die; down force is applied to the male die so that the male die can move downwards, and therefore downward deep drawing is conducted on the portion, located on the lower portion of the male die, of the sheet to be formed; stamping deep drawing and electromagnetic pulse deep drawing are conducted repeatedly before deep drawing forming of the sheet to be formed is completed. According to the electromagnetic pulse boosting type gradual deep drawing forming method, the traditional male die forming technology and the electromagnetic pulse forming technology are combined, stamping deep drawing and electromagnetic pulse deep drawing are conducted alternately, and the depth of deep drawing forming of a cylindrical part is increased. The invention further provides an electromagnetic pulse boosting type gradual deep drawing forming device.

Description

technical field [0001] The invention belongs to the field of plastic forming of materials, in particular to electromagnetic pulse forming of metal sheets, and in particular to an electromagnetic pulse-assisted progressive drawing forming method and device. Background technique [0002] In the traditional sheet metal deep drawing forming process, in order to avoid the wrinkling of the material, it is necessary to use a blank holder to assist in forming. Such as figure 1 Shown is the stress-strain state of the formed sheet during conventional deep drawing. The flange area is subjected to radial tensile stress and tangential (circumferential) compressive stress, and produces elongation and compression deformation in the radial and tangential directions respectively. The thickness of the plate increases slightly, and the thickness at the outer edge of the flange increases the most. At the rounded corner of the die, in addition to being drawn radially, the material also undergo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D26/14B21D22/20B21D35/00B21D37/10
Inventor 莫健华方进秀崔晓辉李建军黄亮李奋强
Owner HUAZHONG UNIV OF SCI & TECH
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