High precision spinning forming method for thin wall closing head with radius-thickness ratio less than three per mille

Abstract

The invention relates to a thin-walled closure head high accuracy spinning forming method. The invention is to resolve the problem of big size closure head, thin wall thickness, high accuracy size and high difficulty of forming. Spinning machine is started to make rolling wheel do axial and circumferential movement along track loaded into program in head while spinning, meanwhile main axle of spinning machine drives core and bar plate to spin. When rolling wheel rolls to the distance of 20mm from edge it quits. The invention has the advantages of simple process and high accurate product.

Description

technical field [0001] The invention relates to a spinning forming process of a head. Background technique [0002] The head is a key pressure-bearing part of various pressure vessels and storage tanks. Among them, thin-walled heads with a thickness-to-diameter ratio of less than 3‰ are mainly used in the lining of pressure vessels and storage tanks on spacecraft and large-scale pressure vessels. Its forming process has an important influence on the pressure vessel manufacturing technology. (Sun Jiazhong, Head Forming and Aerospace Engineering "Forging Technology", 1990 Supplement, pp. 18-20). Traditional pressure vessel heads are mostly produced by stamping method, which requires large-tonnage, large-table hydraulic presses and complete sets of large-scale molds, which are not suitable for aerospace pressure vessel heads. Yan Zhihe, Current status and prospect of head manufacturing. "Forging Technology", 1990 Supplement, pp. 7-10; -17 pages). Therefore, since the 1960s,...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the size of the head on the spacecraft is relatively large, the wall thickness is relatively thin, the dimensional accuracy is high, and the forming is difficult, especially the thin-walled head with a thickness-to-diameter ratio of less than 3‰ is more difficult to spin. The problem is to provide a high-precision spinning method for thin-walled heads with a thickness-to-diameter ratio of less than 3‰. The invention only needs one piece of equipment, and the spinning can be completed by installing the slab at one time. It has high forming accuracy and low mold cost. Low cost and short production cycle

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