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Diameter and shape precision control method of thin-walled cylinder and special tool thereof

A thin-walled cylinder and precision control technology, applied in the processing field of thin-walled cylinders, can solve the problems of inability to meet the precision requirements, poor shape calibration accuracy, time-consuming and other problems, and achieve good shape correction effect, high diameter size and shape accuracy, and diameter size control. accurate effect

Active Publication Date: 2012-11-28
AEROSPACE SCI & IND KET TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is time-consuming and laborious, and the accuracy of shape correction is poor, and often cannot meet the accuracy requirements specified in the design.

Method used

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  • Diameter and shape precision control method of thin-walled cylinder and special tool thereof
  • Diameter and shape precision control method of thin-walled cylinder and special tool thereof
  • Diameter and shape precision control method of thin-walled cylinder and special tool thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] For a thin-walled cylinder with a dimension parameter of Φ880mm×2000mm and a wall thickness of 3.8mm on a certain aircraft, the control process of its diameter and shape accuracy is as follows:

[0036] 1) Diameter design of thin-walled cylinder 3 before calibration: Process design controls the thickness of thin-walled cylinder 3 after calibration to have an appropriate amount of plastic stretching deformation in the circumferential direction, and its wall thickness is reduced by 0.023mm. Thin-walled cylinder 3 outer diameter size d before calibration 2 According to the formula calculated as d 2 =d 1 ×t 1 / t 2 =880×3.8 / 3.82=876mm, where d 1 Is the outer diameter of the calibrated thin-walled cylinder 3, t 1 Is the thickness of the thin-walled cylinder 3 after shaping, t 2 It is the thickness of the thin-walled cylinder 3 before the calibration.

[0037] 2) Preheating of thin-walled cylinder 3: Position the thin-walled cylinder 3 on the base 2.3 of the special spreader 2, star...

Embodiment 2

[0049] For a thin-walled cylinder with a dimension parameter of Φ1200mm×2400mm and a wall thickness of 4.0mm on a certain aircraft, the control process of its diameter and shape accuracy is as follows:

[0050] 1) The diameter design of the thin-walled cylinder 3 before the calibration: the process design controls the thin-walled cylinder 3 after the calibration to have an appropriate amount of plastic stretching deformation in the circumferential direction, and the wall thickness is reduced by 0.01mm. Thin-walled cylinder 3 outer diameter size d before calibration 2 According to the formula calculated as d 2 =d 1 ×t 1 / t 2 =1200×4.0 / 4.01=1197mm, where d 1 Is the outer diameter of the calibrated thin-walled cylinder 3, t 1 Is the thickness of the thin-walled cylinder 3 after shaping, t 2 It is the thickness of the thin-walled cylinder 3 before the calibration.

[0051] 2) Preheating of the thin-walled cylinder 3: Position the thin-walled cylinder 3 on the base 2.3 of the special spr...

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Abstract

The invention discloses a diameter size and shape precision control method of a thin-walled cylinder of a rocket chamber shell. The diameter size and shape precision control method comprises the following steps of: 1) thin-walled cylinder diameter design before sizing; 2) thin-walled cylinder pre-heating treatment; 3) installation of special thermal bulging core die; 4) thermal bulging treatment of a thin-walled cylinder; 5) discharging and cooling; 6) appearance detection of the thin-walled cylinder; and 7) repetition of sizing treatment. By utilizing the diameter size and shape precision control method provided by the invention, quantitative thermal bulging with proper plastic stretching is carried out on the thin-walled cylinder by using the special thermal bulging core die, so that the diameter size is accurately controlled, and the appearance correction effect is good. The diameter size and shape precision of the obtained thin-walled cylinder are higher, so that the product design precision requirements can be entirely met.

Description

Technical field [0001] The invention relates to a processing method of a thin-walled cylinder, in particular to a method for controlling the diameter and shape accuracy of the thin-walled cylinder of a rocket combustion chamber shell and a special tool. Background technique [0002] The thin-walled shell has the characteristics of light weight, material saving, compact structure, etc., which can meet the requirements of the cylindrical shell of the solid rocket ramjet afterburner. The solid rocket engine is the power unit of the space vehicle, which is composed of a combustion chamber, a propellant grain, a nozzle, an igniter and other main parts. The combustion chamber shell is a key part of the solid rocket engine system, which provides power to the aircraft through the combustion of propellant. The cylindrical section of the combustion chamber shell is formed by butt welding of 2 to 4 thin-walled cylinders. After the propellant is burned, it must withstand the high pressure g...

Claims

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Application Information

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IPC IPC(8): B21D1/08
Inventor 韩庆波张朔王华东余天雄
Owner AEROSPACE SCI & IND KET TECH CO LTD
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