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Correction method for large barrel type part heat treatment elliptical deformation in cold state

A large-scale cylinder and calibration method technology, applied in the field of calibration, can solve problems such as elliptical deformation of large-scale cylinder-type parts, and achieve the effects of saving manpower and material resources, preventing springback and saving energy

Inactive Publication Date: 2017-09-22
CITIC HEAVY INDUSTRIES CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the existing problem of elliptical deformation of large cylindrical parts, and to provide a method for correcting the elliptical deformation of large cylindrical parts in a cold state during heat treatment

Method used

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  • Correction method for large barrel type part heat treatment elliptical deformation in cold state
  • Correction method for large barrel type part heat treatment elliptical deformation in cold state
  • Correction method for large barrel type part heat treatment elliptical deformation in cold state

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Embodiment Construction

[0021] As shown in the figure, the specific implementation method is as follows:

[0022] The material of the cylinder is 18MnD5, the designed outer diameter is 2320mm, the inner diameter is 2204mm, and the height is 3810mm. After quenching and tempering process heat treatment, elliptical deformation occurs in all areas of the height of the cylinder after quenching (water cooling). The most serious part is the short axis of the inner circle is 2155mm, the long axis is 2206mm, and the difference between the long axis and the short axis is more than 50mm, resulting in semi-finishing. There is no processing volume, in order to avoid job scrapping, it is necessary to perform ellipse correction.

[0023] First, lay the cylinder horizontally on the open space, make a support pad below, measure the inner circle with a tape measure and divide it into several areas equally according to the height, each area is about 900mm long, and measure the elliptical deformation of each area of ​​t...

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Abstract

Disclosed is a correction method for large barrel type part heat treatment elliptical deformation in a cold state. Correction is conducted in the cold state of a part, the preheating procedure before correction is omitted, a jack and other existing tools are fully used, and manpower and material resources are saved. The part and a support rod are put into a furnace together, high-temperature tempering is conducted, thus elastic deformation of the part under the room temperature is converted into plastic deformation, and resilience is prevented. The correction method is simple to operate, energy is saved, and practicable and effective effects are achieved.

Description

technical field [0001] The invention relates to a correction method, in particular to a correction method in a cold state of the elliptical deformation of a large cylindrical body part during heat treatment. Background technique [0002] Large cylinder parts are key parts in nuclear power projects. The height of such parts can reach 4m, and the wall thickness is less than 100mm. The heat treatment is usually heated by a trolley furnace. During the heat treatment process, due to the small wall thickness of the parts and the internal organization The thermal stress and tissue stress produced by inhomogeneity and temperature inhomogeneity can easily lead to elliptical deformation of the part, and the height of the part is relatively large, and the direction of elliptical deformation in each height range is inconsistent, which brings great difficulties to the later machining. Difficult, in order to be able to process the products required by the drawings, it is necessary to enla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/14B21D51/10C21D9/00
CPCB21D3/14B21D51/10C21D9/0068
Inventor 郭建于慎君雷晓娟张沛
Owner CITIC HEAVY INDUSTRIES CO LTD
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