A reverse spinning method for ultra-high-strength steel outer stepped thin-walled cylinder
An ultra-high-strength steel, reverse spinning technology, used in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of complex process, achieve the effect of simple process, less spinning time, and simple structure
Active Publication Date: 2021-02-26
西安长峰机电研究所
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Problems solved by technology
This method of using a special calibration fixture to control the thin-wall shape accuracy after heat treatment requires special tooling, and the process is relatively complicated
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.
[0025] The invention provides a reverse spinning method for a thin-walled cylinder with an outer step of ultra-high strength steel. The control of the spinning size and shape and position accuracy of the stepped cylinder of ultra-high strength steel is realized by the following means:
[0026] a) Requirements for spinning tooling
[0027] The material of the spinning mandrel is CrWMn, the overall quenching method is adopted, the hardness is HRC58-62, and the roughness of the working surface is higher than 0.8μm. The processing size and installation accuracy of the mandrel directly affect the quality of the product, and it is necessary to strictly control the runout, straightness and installation accuracy of the mandrel. The roundness of the mandrel is not more than 0.02mm,...
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Abstract
The invention provides a reverse spinning method for an ultra-high-strength steel outer stepped thin-walled cylinder. The spinning blank is blanked, and the blank is annealed, and the heat-treated blank is mechanically processed to obtain the reverse spinning blank. The pressed blank is formed by reverse spinning twice, spinning to the required size of the design, and stress relief annealing is carried out on the cylinder obtained by spinning. The invention is used for the spinning forming of the step cylinder on the outer surface of ultra-high-strength steel, which can ensure the size and shape accuracy of the step cylinder, improve the pass rate and processing efficiency of the combustion chamber shell, and propose a reverse spinning method for the thin-walled step cylinder. The measures to control the accuracy of shape and position provide technical reference for the spinning of ultra-high-strength steel stepped parts.
Description
technical field [0001] The invention belongs to the field of advanced manufacturing technology, and relates to spinning forming and process technology of ultra-high-strength steel D6AC cylindrical parts mainly used in aviation and aerospace. Background technique [0002] The solid rocket motor combustion chamber casing is usually composed of a front connector, a cylinder body, and a rear connector. The cylinder body requires light weight, high strength, excellent performance, and can withstand large loads. Ultra-high-strength steel thin-walled spinning parts are generally used. Ultra-high-strength steel spinning forming is the key process technology for cylinder production and manufacturing. With the needs of technological development, the number of ultra-high-strength steel stepped cylinders is gradually increasing, and the steps generally play the role and purpose of guiding and increasing strength. For a low-alloy ultra-high-strength steel thin-walled cylinder with a slen...
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IPC IPC(8): B21D22/16C21D9/08C21D1/30C21D11/00
CPCB21D22/16C21D1/30C21D9/08C21D11/00
Inventor 何芳王静薇朱伟强蔺海
Owner 西安长峰机电研究所