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Method and device for hot forming of medium-thickness plates under elastic preloading

A preloading, sheet metal technology, used in forming tools, metal processing equipment, manufacturing tools, etc., can solve problems such as difficulty in forming medium-thick sheets, and achieve large processing flexibility, increased draw ratio, fatigue resistance and resistance. The effect of stress corrosion capacity enhancement

Active Publication Date: 2013-07-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of hydraulic equipment and other conditions, it is still difficult for water jet to realize the forming of large curvature of medium and thick plates at room temperature.

Method used

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  • Method and device for hot forming of medium-thickness plates under elastic preloading

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: High-pressure injection impact forming of aluminum alloy medium-thick plate with hot liquid medium under elastic preload.

[0019] The device includes a liquid delivery system, a workholding system, a moving system, a heating system and a control system. The liquid transmission system includes a high-pressure pump 1, a high-pressure pipe 2, an injection head 5, a high-pressure nozzle 6, and a high-pressure hot liquid medium 3; the moving system includes a cantilever beam 8, a column 11, and a base 12; the workpiece fixture system includes a medium-thick plate 7, a clamp 9. Baffle plate 10, pre-bending mold 13, workbench 16; heating system includes heater 4, temperature switch 14, resistance heating rod 15; control system includes computer 17, controller 18.

[0020] The medium-thick plate 7 to be formed is tightly attached to the surface of the pre-bending mold 13 under the clamping force of the clamp 9 , and after obtaining a preliminary pre-deformed shape, ...

Embodiment 2

[0022] Example 2: High-pressure injection impact forming of hot liquid medium in medium-thick magnesium alloy plate under elastic preload.

[0023] The difference between this embodiment and embodiment 1 is that the magnesium alloy medium-thick plate is heated to 300-350°C, the temperature of the high-pressure hot liquid medium is heated to 250°C, and the injection pressure of the high-pressure hot liquid medium 3 is 20-40MPa. Others are the same as in Example 1.

Embodiment 3

[0024] Example 3: High-pressure injection impact forming of titanium alloy medium-thick plate with hot liquid medium under elastic preload.

[0025] The difference between this embodiment and embodiment 1 is that the medium-thick titanium alloy plate is heated to 700-920°C, the temperature of the high-pressure hot liquid medium is heated to 400°C, and the injection pressure of the high-pressure hot liquid medium 3 is 80-250MPa. Others are the same as in Example 1.

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Abstract

The invention discloses a method and device for hot forming of medium-thickness plates under elastic preloading and belongs to the technical field of metal plate plastic forming. The method includes: elastically preloading a medium-thickness plate on a pre-bending die to enable the medium-thickness plate to elastically deform, heating the medium-thickness plate to be formed to 150-920 DEG C according to physical performances of the medium-thickness plate, and applying high-pressure hot liquid medium of 150-400 DEG C to a tension surface area of the medium-thickness plate for impacting to enable the medium-thickness plate to plastically deform until obtaining a needed shape. The medium-thickness plate is preloaded to elastically deform, so that a needed basic shape is primarily obtained; the medium-thickness plate is heated to 150-920 DEG C, so that material yield strength is lowered and extension ratio of the medium-thickness plate is increased. Compared with a medium-thickness plate formed by independently adopting high-pressure water jet, the medium-thickness plate formed by the method has the advantages of bigger curvature, high accuracy and bigger thickness.

Description

technical field [0001] The invention belongs to the technical field of plastic forming of metal plates, and in particular relates to a method and a device for hot forming of medium-thick plates under elastic preloading. Background technique [0002] Lightweight alloys mainly include aluminum alloys, magnesium alloys, titanium alloys, etc. The sheet metal parts have the advantages of light weight and high strength, and are widely used in aerospace, automotive panels, electronics, instrumentation and other industries. At present, the sheet metal plastic forming methods mainly include stamping forming, shot peening forming, prestressed shot peening forming, high pressure water jet forming and so on. [0003] Stamping forming is one of the most commonly used processing methods for sheet metal plastic forming. Its principle is to use a press to press the metal sheet through a mold to cause plastic deformation to obtain parts of a certain shape. Stamping forming is suitable for r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/021B21D26/031B21D26/027B21D37/16
Inventor 张兴权郑如余晓流左立生周煜王会廷
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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