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Sheet-stretching machine

A drawing machine and plate technology, applied in the field of mechanical engineering, can solve the problems of uneven distribution of tensile stress and tensile strain, high manufacturing cost, and low material utilization rate, so as to improve material utilization rate, reduce manufacturing cost, and improve forming quality effect

Active Publication Date: 2010-12-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the clamps of the traditional stretching machine hold the sheet and then the various parts of the sheet are stretched synchronously along the longitudinal direction with the cooperation of the drawing die, the distribution of tensile stress and tensile strain of the part is obviously uneven when forming a double curvature skin part
Therefore, the blank often requires a large process margin during drawing, resulting in a low utilization rate of the material
In addition, the currently commonly used stretching machines use complex control systems, resulting in expensive manufacturing costs

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0063] The specific content and working process of the present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0064] Fig. 1 is a schematic diagram of a stretching machine. The stretching machine is composed of a frame 1, left and right clamping mechanisms, and a press-down mechanism. The frame 1 supports the left and right clamping mechanisms and the press-down mechanism. In Fig. 1, both the clamping plate 2 and the rollers 3 are powered by the first hydraulic cylinder 4 and the second hydraulic cylinder 4′, and the clamping mechanism clamps the plate through the clamping plate 2 and applies a certain pulling force. The pressing mechanism contacts the sheet material 5 through the roller 3, and exerts a certain pulling force on the sheet material 5 under the cooperation of the drawing die 6, and finally shapes the sheet material 5. figure 2 The difference from Fig. 1 is that the frame 1 is equipped with an adj...

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Abstract

The invention provides a sheet-stretching machine, relates to a plastic working device for the three-dimensional curved-surface forming of sheet workpieces, and belongs to the field of mechanical engineering. The invention aims to allow pulling pieces to tend to be uniform in the distribution of tensile stress and tension strain, realize the pulling of complex curved-surface workpieces, improve the forming quality of the pulling pieces, improve material utilization rate and reduce the cost for manufacturing pulling devices. This machine mainly comprises a frame (1), a left-side clamping mechanism, a right-side clamping mechanism and a down-pressing mechanism, wherein the frame (1) supports the left-side clamping mechanism, the right-side clamping mechanism and the down-pressing mechanism;each clamping mechanism is divided into an upper part and a lower part; each part has a plurality of clamping devices arranged in a row; and the down-pressing mechanism has a plurality of down-pressing devices arranged in a row or a plurality of rows.

Description

Technical field: [0001] Plate drawing machine is a plastic processing equipment used for three-dimensional curved surface forming of plate parts, which belongs to the field of mechanical engineering. Background technique: [0002] Stretching machine is a device for stretching and deforming plates, and is mainly used in the forming of double curvature skin parts in the aerospace field. Traditional stretching machines can be divided into horizontal stretching machines and longitudinal stretching machines. Stretching can make the inner and outer layers of the sheet produce tensile stress and tensile strain in the stretching direction, thereby reducing the amount of springback of the workpiece. Since the clamps of the traditional stretching machine hold the sheet and then the various parts of the sheet are stretched synchronously along the longitudinal direction with the cooperation of the drawing die, the distribution of tensile stress and tensile strain of the part is obvious...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C1/16
Inventor 李明哲付文智龚学鹏刘纯国冯朋晓崔相吉邓玉山蔡中义隋振
Owner JILIN UNIV
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