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Drawing and hydraulic integrated forming method

A composite forming and pre-stretching technology, which is applied in the field of metal pressure processing, can solve problems such as springback, achieve uniform wall thickness distribution, solve springback problems, and achieve high material utilization.

Inactive Publication Date: 2011-11-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a stretching liquid-filled composite forming method, which can solve the springback problem of the part after forming while ensuring the surface quality and wall thickness distribution of the part well.

Method used

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  • Drawing and hydraulic integrated forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In the drawing liquid-filled composite forming method provided in this embodiment, when the upper die 105 is a convex die, such as Figure 1 ~ Figure 3 shown, including the following steps:

[0040] Step 1: pre-stretching the board 103 .

[0041] Using the plate 103 as a blank, place the plate 103 on the workbench 106 of the plate hydroforming machine, use the left clamp 102 and the right clamp 107 to clamp the two ends of the plate 103, and control the left stretching hydraulic cylinder 101 and The stretching hydraulic cylinder 108 on the right side performs pre-stretching, and the clamps on both sides move in the direction of increasing relative distance. According to the properties of the sheet material, the pulling force F is controlled between 0<F≤100000N. By stretching, Make the plate 103 enter the plastic deformation stage;

[0042] Step 2: Clamp the mold.

[0043] Press the plate 103 by the blank holder 104 to complete the mold clamping process;

[0044] Ste...

Embodiment 2

[0048] The stretching fluid-filled composite forming method provided in this embodiment, such as Figure 4-Figure 6 shown, including the following steps:

[0049] Step 1: pre-stretching the board 103 .

[0050]Using the plate 103 as a blank, place the plate 103 on the workbench 106 of the plate hydroforming machine, use the left clamp 102 and the right clamp 107 to clamp the two ends of the plate 103, and control the left stretching hydraulic cylinder 101 and The stretching hydraulic cylinder 108 on the right side performs pre-stretching, and the clamps on both sides move in the direction of increasing relative distance. According to the properties of the sheet material, the pulling force F is controlled between 0<F≤100000N. By stretching, Make the plate 103 enter the plastic deformation stage;

[0051] Step 2: Clamp the mold.

[0052] Press the plate 103 by the upper mold 105 to complete the mold clamping process;

[0053] Step 3: Perform liquid filling and bulging.

[0...

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Abstract

The invention provides a drawing and hydraulic integrated forming method. The method comprises the following steps of: step 1: pre-drawing a sheet material, step 2: closing a die; step 3: expanding by introducing a liquid, step 4: releasing the pressure of a liquid chamber, opening the die and taking out the molded part. The drawing and hydraulic integrated forming method provided by the invention can solve the rebound problem of the molded part while well ensuring surface quality and wall thickness distribution of the part. Besides, the formed part has a high surface quality and a uniform distribution of wall thickness.

Description

technical field [0001] The invention belongs to the technical field of metal pressure processing, and in particular relates to a drawing liquid-filled composite forming method. Background technique [0002] With the renewal of design concepts and the continuous improvement of basic theories, more and more shallow stretched parts are used in the fields of aviation, aerospace and automobile manufacturing, such as aircraft skins, automobile outer covers, etc.; such parts have a forming area Large, small curvature of the parts, such as hyperbolic flat shell parts; it is easy to spring back after drawing with ordinary technology. At present, such parts are usually formed by the drawing method, that is, the edge of the sheet is clamped by the jaws, and the punch and the jaws are relatively moved, so that the sheet is pulled and molded along the punch. Although the use of drawing-formed parts can basically solve the problem of springback, it is prone to forming defects such as une...

Claims

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Application Information

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IPC IPC(8): B21D35/00B21D22/24B21D26/021
Inventor 郎利辉王永铭谢亚苏
Owner BEIHANG UNIV
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