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Method for controlling accuracy of shape of ultrahigh-strength steel thin-wall cylinder

An ultra-high-strength steel, thin-walled cylinder technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of high shell strength, products can only be used for ground tests, and difficult to process thin-walled parts, and achieve shape accuracy. high effect

Active Publication Date: 2013-07-24
湖北三江航天江北机械工程有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The processing of existing thin-walled parts is difficult, and it is easy to deform during processing, and it is difficult to ensure the processing quality of parts
For example, the cylindrical shell of the above-mentioned supplementary combustion chamber undergoes large deformation after intensive heat treatment in the process of quenching + low-temperature tempering: the design requirement for straightness error is not greater than 3mm, but actually exceeds 6mm; the design of size and diameter difference (replacing the roundness error) The requirement is not greater than 2mm, but actually exceeds 5mm
Moreover, using mechanical hammering for cold correction has little effect due to the high strength of the shell (over 1600MPa), and the resulting product can only be used for ground tests

Method used

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  • Method for controlling accuracy of shape of ultrahigh-strength steel thin-wall cylinder
  • Method for controlling accuracy of shape of ultrahigh-strength steel thin-wall cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] For an ultra-high-strength steel supplementary combustion chamber cylindrical shell with a size parameter of Φ260mm×2000mm and a wall thickness of 2mm on an aircraft, the shape accuracy control process is as follows:

[0027] 1) Cylindrical shape inspection: After the cylindrical shell 4 of the supplementary combustion chamber is quenched, a cross-section is detected at intervals of 300 mm along the axial direction of the cylindrical shell 4, a total of 7 cross-sections, and each section is equally divided along the circumferential direction to detect 6 The size and diameter difference of the bar diameters, and the straightness of the 12 busbars corresponding to the two ends of the 6 diameters are detected at the same time, and marked and recorded.

[0028] 2) Installation of the special correction fixture: the special correction fixture 3 is installed on the outer cylindrical surface of the cylinder shell 4, the special correction fixture 3 includes a pair of heat-resis...

Embodiment 2

[0034] For an ultra-high-strength steel supplementary combustion chamber cylindrical shell with a size parameter of Φ600mm×3500mm and a wall thickness of 3mm on an aircraft, the shape accuracy control process is as follows:

[0035] 1) Cylindrical body shape inspection: After the cylindrical shell 4 of the supplementary combustion chamber is quenched, a cross-section is detected at intervals of 300mm along the axial direction of the cylindrical shell 4, a total of 12 cross-sections, and each section is equally divided along the circumferential direction to detect 6 The size and diameter difference of the bar diameters, and the straightness of the 12 busbars corresponding to the two ends of the 6 diameters are detected at the same time, and marked and recorded.

[0036] 2) Installation of the special correction fixture: the special correction fixture 3 is installed on the outer cylindrical surface of the cylinder shell 4, the special correction fixture 3 includes a pair of heat-...

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Abstract

The invention discloses a method for controlling accuracy of the shape of an ultrahigh-strength steel thin-wall cylinder. The method comprises the following steps of: 1) detecting the appearance of a cylinder; 2) mounting a special shape correction clamp; 3) tempering for stable shape; 4) discharging and cooling; 5) removing the special shape correction clamp and detecting the appearance; and 6) performing repeated shape correction. In the method, after a cylinder shell is quenched, the special shape correction clamp performs shape correction of the cylinder shell, and then the corrected shape is stabilized by tempering. The shape accuracy of the obtained cylinder shell is relatively high, and the requirement on the product design accuracy is completely met, wherein after the shape correction, the linearity error is not greater than 2.5 mm, and difference between large and small diameters is not greater than 1.5 mm. The processing method disclosed by the invention can be applied to the shape accuracy control on the cylinder shell of a secondary combustion chamber of a solid rocket ramjet.

Description

technical field [0001] The invention relates to a processing method of a thin-walled cylinder, in particular to a method for controlling the shape accuracy of an ultra-high-strength steel thin-walled cylinder. Background technique [0002] Ultra-high-strength steel has high strength and sufficient toughness, can withstand high loads, has high specific strength, and can significantly reduce the quality of workpieces. Therefore, the application object of ultra-high-strength steel is mainly the aerospace industry, such as using it to make thin-walled casings for aerospace solid rocket motors. The thin-walled shell has the characteristics of light weight, material saving, compact structure, etc., and can meet the requirements of the cylindrical shell of the afterburning chamber of the solid rocket ramjet. [0003] The solid rocket ramjet uses the oxygen in the atmosphere as the oxidant, and its specific impulse is 4 to 6 times that of the solid rocket motor. Another advantage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/08C21D9/00
Inventor 韩庆波钟臻荣王明坤何华锋王华东高建国
Owner 湖北三江航天江北机械工程有限公司
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