Universal pushing and pulling mechanism for stretch forming machine

Abstract

The invention discloses a universal pushing and pulling mechanism for a stretch forming machine, relates to a plastic processing device used for forming the curved surface of the sheet workpiece and belongs to the mechanical engineering field. The universal pushing and pulling mechanism mainly comprises a ball-end connection rod (1) and a connection body, wherein one end of the ball-end connection rod has a ball-shaped head, the other end is connected with the corresponding connection body through a screw thread or pin; and the ball-shaped head is hemispherical or spherical and is connected with a material-clamping frame (2) or a material-stripping mechanism connection body (10) directly or through a bearing bush (6) with a hemispherical pit. By using the universal pushing and pulling mechanism, the material-clamping mechanism can rotate and swing freely around the ball-shaped head of the ball-end connection rod and a plurality of material-clamping mechanisms in a row which are in a linear or arc arrangement can realize the flexible control of a plurality of clamps of the stretch forming machine; and the workpiece can snugglle closely to the mould during stretch forming, the material utilization rate of the workpiece can be obviously increased, the stretch forming of the workpiece with complicated curved surfaces can be realized, and the production demands of various workpieces can be met better.

Description

technical field [0001] The universal push-pull mechanism for a stretch forming machine of the present invention relates to plastic processing equipment for forming curved surfaces of plate parts, and belongs to the field of mechanical engineering. Background technique [0002] When the traditional stretch forming machine draws the workpiece, the plate at the jaw basically moves along the horizontal direction; when forming a workpiece with a large transverse curvature, the distribution of tensile stress and tensile strain in the transverse direction of the plate is obviously uneven, which is easy to cause non-fitting, Forming defects such as tearing or wrinkling. In order to prevent these defects, the control precision of the equipment is very high, the design of the control system is complicated, and the equipment is expensive; moreover, the blanks for drawing often require a large process margin, resulting in low material utilization. Contents of the invention [0003] T...

AI Technical Summary

Problems solved by technology

[0002] When the traditional stretch forming machine draws the workpiece, the plate at the jaws basically moves along the horizontal direction; when forming a workpiece with a large transverse curvature, the distribution of tensile stress and strain in the transverse direction of the plate is obviously uneven, which is easy to cause non-fitting, Forming defects such as tearing or wrinkling

In order to prevent these defects, the control accuracy of the equipment is very high, the design of the control system is complicated, and the equipment is expensive; moreover, the blanks for drawing often require a large process margin, resulting in low material utilization.

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