Plate stretch-forming machine

Abstract

A plate stretch-forming machine of the invention relates to plastic processing equipments used for 3-D curved surface forming of plates and belongs to the mechanical engineering field. The machine aims at facilitating tensile stress and tensile strain distribution of stretch-forming parts to be even, realizing stretch-forming of curved parts with big curvature, improving stretch-forming quality and material utilization ratio and reducing manufacturing cost of stretch-forming devices. The machine mainly comprises a rack (1), a row of multiple material-pulling mechanisms and a row of multiple material-chucking mechanisms (3), which are arranged at the left and right sides of the rack (1) respectively; the material-pulling mechanism is formed by mutual hinge joint of three hydraulic cylinders (2), wherein, one of the three hydraulic cylinders (2) is horizontally arranged, one vertically arranged and one obliquely arranged; the material-chucking mechanism is mainly composed of a support (10), a material-chucking plate (11) and a small-stroke single-acting hydraulic cylinder (12).

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 are generally divided into horizontal stretching machines and longitudinal stretching machines. During stretching, tensile stress and tensile strain are generated on the inner and outer layers of the sheet along the stretching direction, thereby reducing the amount of springback 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 ten...

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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