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Cutting ring type measurement method for residual stress of cylinder wall of cylindrical part

A technology of residual stress and measurement method, applied in the direction of force/torque/work measuring instrument, measuring device, instrument, etc., which can solve the problems of difficult implementation, high cost, and complicated test equipment

Active Publication Date: 2015-04-01
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using image processing technology for non-contact residual stress detection is a novel concept, but the test equipment is relatively complicated, and it is realized by image capture and image processing technology, which is difficult and costly to implement;

Method used

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  • Cutting ring type measurement method for residual stress of cylinder wall of cylindrical part
  • Cutting ring type measurement method for residual stress of cylinder wall of cylindrical part
  • Cutting ring type measurement method for residual stress of cylinder wall of cylindrical part

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Embodiment Construction

[0093] The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

[0094] The following takes the deep drawing of 304 stainless steel cylindrical parts and the subsequent ring cutting test as an example to illustrate the specific implementation of the ring cutting test for measuring the residual stress of the cylindrical part wall:

[0095] The first step, the preparation of cut ring sample

[0096] The 304 stainless steel cylindrical deep-drawing part is a 304 stainless steel circular flat blank with a thickness of 0.94mm (nominal thickness 1.0mm) and a diameter of φ72mm, which is drawn on a YB32-40A hydraulic press with a nominal pressure of 400KN using a deep-drawing die. shaped.

[0097] The geometric dimensions of the deep drawing die and the parameters of the deep drawing forming process are shown in Table 1. Among them, the diameter of the drawing die is φ40.8mm, and the fillet radius of the drawi...

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Abstract

The invention discloses a cutting ring type measurement method for residual stress of the cylinder wall of a cylindrical part. The cutting ring type measurement method includes the following steps of (1) forming a cutting ring, wherein a circular ring cut from the cylinder wall of the cylindrical part is used as the circular ring to be cut, and the circular ring to be cut is cut apart in the radius direction to form the cutting ring; (2) calculating the residual stress, wherein in the circular ring to be cut, a calculation formula for the radial residual stress sigma <rr> and a calculation formula for the circumferential residual stress sigma <theta theta> of the position spaced from the center of the circular ring by r in the radius direction are expressed in the specification. Multi-point measurement can be achieved without developing a special measurement device, operation is easy and convenient, efficiency is high, and results are accurate.

Description

technical field [0001] The invention relates to a ring cutting method for measuring the residual stress of the wall of a cylindrical part. Background technique [0002] Cylindrical parts are commonly used in industrial production: when they have a bottom, they are cup-shaped cylindrical parts, such as storage containers for nuclear raw materials in the nuclear industry, shell casings in military production, etc.; when they have no bottom, they are hollow tubes , Widely used in chemical industries such as petroleum exploration and refining. There is generally residual stress in the wall of cylindrical parts, and the residual stress has an important influence on its strength, fracture toughness, corrosion resistance and cracking ability, dimensional stability, etc.; when the residual stress of the wall of cylindrical parts is too large, It is easy to produce longitudinal (along the generatrix) cracks on the cylinder wall and make the cylindrical parts scrapped, resulting in s...

Claims

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Application Information

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IPC IPC(8): G01L5/00
Inventor 肖良红袁道合刘金刚向俊仲周益春
Owner XIANGTAN UNIV
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