Thin plate tensioning curved surface forming device

Abstract

The invention relates to a thin plate tensioning curved surface forming device which allows tensioning plastic forming of a plate to be achieved on the basis of single-die surface shape matching, and belongs to the field of mechanical engineering. The thin plate tensioning curved surface forming device aims at reducing forming force, saving energy, controlling the transverse change of the plate as well, reducing transverse folds and promoting deformation of the plate to be more even. The thin plate tensioning curved surface forming device is mainly composed of a machine frame (1), a die lifting platform (2), plate stretching systems (3) arranged on the two sides of the die lifting platform (2), and a wire rope stretching and contraction driving system (4). At least three plate stretching systems (3) are arranged on each side of the die lifting platform (2). Each plate stretching system (3) comprises a wire rope (5), a fixed pulley block (6), a movable pulley (7) and a plate clamping device (8), wherein the direction of the wire rope (5) is changed through the fixed pulley block (6), force is transmitted to the plate clamping device (8) through the movable pulley (7), and the movable pulley (7) and the plate clamping device (8) are integrated.

Description

technical field [0001] The thin plate expansion and tension surface forming device is an expansion and tension plastic forming device that realizes the surface shape bonding of plate parts based on a single mold, and belongs to the field of mechanical engineering. Background technique [0002] The sheet expansion and tension surface forming device is an expansion and tension plastic forming equipment that realizes the surface shape of the sheet based on a single mold. It is mainly used in the forming of aerospace, railway passenger cars, and metal curved surface parts on the surface of modern buildings. The traditional stretching device mainly realizes the two-way tensioning of the plate through the hydraulic cylinder. The jaws for clamping the plate are mainly straight jaws, so a long transition zone is required. In recent years, people have adopted discrete jaws. The transition zone is shortened and the cost is reduced, but because the jaws move as a whole, the lateral shr...

AI Technical Summary

Problems solved by technology

The traditional stretching device mainly realizes the two-way tensioning of the plate through the hydraulic cylinder. The jaws for clamping the plate are mainly straight jaws, so a long transition zone is required. In recent years, people have adopted discrete jaws. The transition zone is shortened and the cost is reduced, but because the jaws move as a whole, the lateral shrinkage of the sheet cannot be controlled, and lateral wrinkling and cracking often occur, making the forming process poor in stability

In order to solve the above deficiencies, the invention patent of publication number: CN101596563A discloses a drawing machine, each drawing unit of which adopts three hydraulic cylinders, which are connected to the clamp through a common shaft, and each hydraulic cylinder is adjusted It realizes stretching of different angles of sheet metal parts, but the biggest disadvantage of this stretching machine is that the three hydraulic cylinders interfere with each other, resulting in waste of energy. At the same time, there are too many hydraulic cylinders, more control, and high cost, which fundamentally does not reduce manufacturing costs.

Publication number: CN103071715A invention patent, which discloses a flexible stretch forming device for curved surface parts, which is mainly composed of a fuselage frame, a stretch forming platform, a pre-stretching and clamping mechanism, and a reconfigurable multi-point mold. However, the forming device is mainly realized by the main stretching rods on both sides, and the output force is small. At the same time, all the clamps are installed on one shaft, which requires high strength of the shaft.

Publication number: CN101961746B invention patent, which discloses a multi-screw local flexible pulling and pressing integrated device, which is mainly composed of an upper movable frame base and a fixed box, and also includes a multi-screw local flexible mechanism. , the stretch forming of the sheet is mainly realized through the joint action of the telescopic cable-stayed force member and the screw. The shortcoming of the patent is that the force is transmitted through the screw, so the requirement for the strength of the screw is relatively high

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