Plate multipoint progressive forming device

Abstract

The invention relates to a plate multipoint progressive forming device which comprises a mould stand, a plurality of driving pressurization units and a plurality of shape adjusting and supporting units, wherein the driving pressurization units are mounted on a top plate of the mould stand; each driving pressurization unit consists of an upper pressing head, a driving basic body, a spring, a piston and a driving hydraulic cylinder; the upper pressing heads are movably mounted at the bottom ends of the driving basic bodies; the driving hydraulic cylinders are fixed to the top plate of the mould stand; the shape adjusting and supporting units are mounted on a bottom plate of the mould stand; each shape adjusting and supporting unit consists of a lower pressing head, a supporting basic body, a spring, an adjusting bolt and a supporting hydraulic cylinder; the lower pressing heads are movably mounted at the top ends of the adjusting bolts; the supporting hydraulic cylinders are fixed to the bottom plate of the mould stand; and under the action of the driving hydraulic cylinders and the supporting hydraulic cylinders, multipoint progressive forming of a plate between the upper pressing heads and the lower pressing heads is realized. The plate multipoint progressive forming device is reasonable in structure; by controlling the pressure difference between the two sides of the plate, the optimal forming effect is realized; the forming precision of the plate is high; and the surface quality of the plate is good.

Description

technical field [0001] The invention relates to the field of sheet material stamping, in particular to a sheet material multi-point progressive forming device. Background technique [0002] With the rapid development of domestic and foreign economies, the demand for three-dimensional plates in industries such as pressure vessels, shipbuilding, and aerospace is increasing. At the same time, the extensive application of new high-strength plates has also brought new problems to surface forming. The formability of high-strength sheet is poor, the degree of allowable deformation is low, and the requirements for deformation path are strict. It is difficult to obtain excellent curved surface parts by traditional stamping forming methods. Studies have shown that applying different pressures on both sides of the sheet to achieve different deformation paths can effectively improve the forming quality, improve the uniformity of deformation and help to increase the forming limit. Howev...

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Problems solved by technology

However, the pressure exerted by the pressurizing unit needs to use the hydraulic press loading device and the electric stroke shape adjustment component, which has a complex structure, and the sheet forming sequence is determined by the height of the adjusting bolts. During forming, only one-way hydraulic cylinders can be used to compress the sheet, which is impossible. The pressure difference adjustment on both sides of the sheet makes it difficult to obtain the optimal forming path

CN202037224U has announced a kind of liquid instead of punch, and the sheet metal flexible forming equipment that multiple basic volumes are adjusted and combined into die, although the process flexibility has been improved to a certain extent, only the liquid pressure on the punch side of the plate is controllable. Stepless adjustment of the pressure difference on both sides of the sheet cannot be achieved

CN1864884A proposes a plateless multi-point forming device based on viscous medium force transmission, the force transmission is uniform, and the plate and the upper basic body are seamlessly bonded, but only by selecting media with different viscosities can the two sides of the plate be applied Different pressures, cumbersome material selection and inconvenient operation

However, for parts with protruding parts such as saddle surfaces and conical surfaces, the suspended area of ​​the plate is very large during the multi-point mold forming process; the multi-point press device has complex structure, complicated control, high requirements, and high cost

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