Four-degree-of-freedom hybrid multi-head flexible drawing machine

Abstract

The invention discloses a four-degree-of-freedom series-parallel multi-point flexible shape pulling machine which is composed of a base, a left traction device, a right traction device, a left plate clamping mechanism and a right plate clamping mechanism. The bottom of the left traction device and the bottom of the right traction device are fixed to the base and used for supporting the left plate clamping mechanism and the right plate clamping mechanism respectively and are identical in structure and are four-degree-of-freedom series-parallel mechanisms of 4RPU-UPR structures. The left plate clamping mechanism and the right plate clamping mechanism which are used for clamping and fixing plates are also of the same structure. Compared with the prior art, the four-degree-of-freedom series-parallel mechanisms and layered adjustment and shape pulling work manners are adopted in the four-degree-of-freedom series-parallel multi-point flexible shape pulling machine, position points on shape pulling parts are easy to flexibly deform, the technology margin is reduced, and the forming quality and the utilization rate of materials are improved. The four-degree-of-freedom series-parallel multi-point flexible shape pulling machine not only is multiple in degree of freedom of motion and few in needed hydraulic cylinders but also has the advantages of being high in flexibility, easy to control, low in equipment manufacturing cost and the like.

Description

technical field [0001] The invention relates to the field of sheet material plastic forming equipment, in particular to a mixed-connection multi-head flexible stretching machine with four degrees of freedom of movement in space, including two translations and two rotations. Background technique [0002] Three-dimensional curved surface parts are widely used in aerospace, high-speed railway, ships, medical engineering, modern architecture and other industries. Many major military or civilian projects and projects require advanced manufacturing technology that can process high-quality three-dimensional curved surface parts. The traditional plastic forming technology requires the use of molds with a long production cycle and high manufacturing and debugging costs, which limits the development of related industries in terms of product diversification, personalization, and upgrades. In order to replace the curved surface forming mold used in the plastic forming process, many expe...

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 , easy to produce forming defects such as not sticking to the mold, cracking or wrinkling

Therefore, in order to eliminate defects, the blanks for drawing often require a large process margin, resulting in a reduction in the utilization rate of materials

In addition, the existing high-flexibility multi-head drawing machine (ZL200910217701.X) adopts a multi-branch and multi-axis hydraulic servo control system. One point requires three large-displacement hydraulic cylinders. Not only the number of hydraulic cylinders required is large, but also the structure Complicated, inconvenient to control, and expensive to manufacture

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