Forming device and method for large thin-wall curved-surface element

Abstract

The invention discloses a forming device for a large thin-wall curved-surface element. The forming device for the large thin-wall curved-surface element comprises a convex die, a blank holder, a concave die, a lower die plate, a first annular sleeve and a second annular sleeve, wherein the first annular sleeve is connected with a first drive oil cylinder; the first drive oil cylinder is capable ofdriving the first annular sleeve to move up and down; the inner diameter of the concave die is greater than the outer diameter of the convex die; the first annular sleeve is arranged in a gap betweenthe convex die and the concave die; the second annular sleeve is arranged at the bottom of the convex die; the first annular sleeve is arranged outside the second annular sleeve; the second annular sleeve is connected with a second drive oil cylinder; the second drive oil cylinder is capable of driving the second annular sleeve to move up and down; each of the first drive oil cylinder and the second drive oil cylinder is connected with a hydraulic system; and one surface facing the convex die, of each of the first annular sleeve and the second annular sleeve is an arc-shaped surface. The invention further provides a forming method for a large thin-wall curved-surface element. By virtue of the forming device, a draw bead is formed in a suspended area of a deformed plate blank, so that thewrinkles of the suspended area are eliminated.

Description

technical field [0001] The invention relates to the technical field of manufacturing equipment for thin-walled curved surface parts, in particular to a forming device and method for large-scale thin-walled curved surface parts. Background technique [0002] In the pressure vessels in the aerospace and petrochemical fields, the combined welding of the head and the barrel section constitutes the main structure of the pressure vessel, and this structural form is widely used. The shape of the head usually adopts spherical or semi-ellipsoidal surface, and the diameter of large curved surface parts is generally more than 3000mm, which is a large thin-walled complex curved plate part. The above-mentioned head is usually manufactured by the thick plate spinning process, but there are a series of problems: it is easy to wrinkle, and the thickness of the curved surface part with a diameter of 3000mm cannot be less than 30mm, otherwise the wrinkle defect cannot be controlled, and the s...

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Problems solved by technology

The above-mentioned head is usually manufactured by the thick plate spinning process, but there are a series of problems: it is easy to wrinkle, and the thickness of the curved surface part with a diameter of 3000mm cannot be less than 30mm, otherwise the wrinkle defect cannot be controlled, and the subsequent machining and chemical milling remove the excess thickness ;The heating in the spinning process is difficult to control accurately, resulting in a decrease in tissue performance and affecting reliability; the spinning efficiency is low, the loading path is complicated, the processing cycle is long, and the dimensional accuracy is poor, and large-scale high-precision parts require high rigidity and precision of spinning equipment , but Germany and other countries restrict the export of high-end spinning equipment

[0003] Although liquid-filled deep drawing can solve the problem of wrinkling of complex curved surface parts formed from ultra-thin wall thickness plates, due to the large overall size of the test piece, ultra-thin wall thickness, and complex profile, the process of liquid-filled deep drawing requires high liquid chamber pressure. The reaction of the chamber pressure results in a large tonnage of equipment. The drawing force required for the drawing force of a 3m-level head is about 12,000 tons, and the drawing force required for a 5-meter-level head is about 30,000 tons. The equipment cost is very high, and the tonnage and cost of the equipment become Bottleneck of liquid-filled deep drawing for large thin-walled curved surface parts

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