High-flexibility multi-head stretching machine

Abstract

The invention discloses a high-flexibility multi-head stretching machine, which relates to plastic processing equipment for three-dimensional curved surface forming of sheet parts and belongs to the field of mechanical engineering. The machine aims to make the distribution of the pulling stress and the tension strain of stretched parts more trend to be uniform, improve the stretching quality and the utilization rate of materials, and realize the stretching of curvature parts with larger transverse curvature or certain wave. The machine mainly comprises a main frame (1), material pulling mechanisms, material clamping mechanisms (3) and universal mechanisms (5), wherein a row of a plurality of the material pulling mechanisms, the material clamping mechanisms (3) and the universal mechanisms (5) are arranged on both sides of the main frame (1) respectively; the material pulling mechanisms consist of three hydraulic cylinders (2) respectively, one of the hydraulic cylinders (2) is horizontally arranged, the other hydraulic cylinder (2) is vertically arranged, and the third hydraulic cylinder (2) are slantways arranged; and one end of each of the three hydraulic cylinders (2) is hinged with the main frame (1) respectively, while the other end is jointly connected with the universal mechanism (5) and the material clamping mechanism (3) through a hydraulic cylinder connection body (4) respectively.

Description

Technical field: [0001] The highly flexible multi-head drawing machine is a plastic processing equipment used for three-dimensional surface forming of plate parts, which belongs to the field of mechanical engineering. Background technique: [0002] Traditional stretching machines are generally divided into horizontal stretching machines and longitudinal stretching machines. During stretching, tensile stress and strain are generated on the inner and outer layers of the sheet along the stretching direction, thereby reducing the amount of springback after plastic deformation of the workpiece. After the clamps of the traditional drawing machine clamp the sheet, with the cooperation of the drawing die, each part of the sheet is basically stretched along the longitudinal direction synchronously. When forming a double-curvature skin part, the distribution of tensile stress and tensile strain of the part is obviously uneven. It is easy to produce forming defects such as not stickin...

AI Technical Summary

Problems solved by technology

After the clamps of the traditional drawing machine clamp the sheet, with the cooperation of the drawing die, each part of the sheet is basically stretched along the longitudinal direction synchronously. When forming a double curvature skin part, the distribution of tensile stress and tensile strain of the part is obviously uneven. It is easy to produce forming defects such as not sticking to the mold, cracking or wrinkling

In order to eliminate defects, blanks for drawing often require a large process margin, which reduces the utilization rate of materials

In addition, the currently commonly used stretching machine uses a multi-axis hydraulic servo control system, resulting in expensive manufacturing costs

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