Sheet-stretching machine

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...

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

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