Stretching and pressing combined type plate stretch forming machine

Abstract

The invention discloses a stretching and pressing combined type plate stretch forming machine which is plastic working equipment for stretch forming of a plate type three-dimensional curved surface piece, and belongs to the field of mechanical engineering. A first object of the invention is to simplify hydraulic pressure of equipment and an electrical control system to lower the manufacturing cost; and a second object is to eliminate bending force on a plate when a vertical oil cylinder on a previous clamping device is loaded, so that pulling stress and strain of the stretch forming piece aredistributed more uniformly, and the shape stability and material utilization of the formed piece are improved. The stretch forming machine mainly consists of a rack, guide devices, downward pressing devices, clamping devices and horizontal prestretching devices (as shown in figures); the rack and the guide devices support the downward pressing devices, the clamping devices and the horizontal prestretching devices on the two sides; each clamping device consists of a plurality of clamping mechanisms; the downward pressing devices consists of a plurality of downward pushing mechanisms; the clamping mechanisms are arranged on the two sides of a mould in a row correspondingly; the downward pushing mechanisms are arranged on the two sides of the mould in a row correspondingly; and the horizontalprestretching devices consist of four hydraulic oil cylinders and universal joints and are arranged on the guide devices on the two sides.

Description

Technical field [0001] The tension-compression composite sheet stretching forming machine disclosed by the invention is a plastic processing equipment for forming three-dimensional plate-like curved parts, belonging to the field of mechanical engineering. Background technique [0002] Due to its unique advantages, the stretch forming machine produces tensile stress and strain in the tensile direction of the inner and outer layers of the sheet to reduce the springback of the workpiece. It is widely used to form double-stranded parts in the fields of aerospace, high-speed rail, and ships. Curvature skinned parts. When the traditional stretch forming machine forms double-curvature skin parts, the transverse tensile stress and tensile strain of the sheet are obviously unevenly distributed, which is prone to wrinkling, cracking and other defects, and requires a large transition zone margin and material utilization. Extremely low, and at the same time, the precision requirements of th...

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Problems solved by technology

When traditional stretch forming machines form double-curvature skin parts, the distribution of tensile stress and tensile strain in the transverse direction of the sheet is obviously uneven, and defects such as wrinkles and cracks are prone to occur, and a large transition zone allowance is required, and the material utilization rate Extremely low, at the same time, the high precision requirements of the equipment lead to complex control system and expensive equipment

Although the cu

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