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Test method for accurately detecting vertical residual stress of rail web of steel rail

A technology of residual stress and testing method, applied in measuring devices, force/torque/work measuring instruments, instruments, etc., can solve the problem of inability to accurately describe the expansion of rail waist instability, large error range, and inability to measure vertical residual stress questions of value

Active Publication Date: 2021-09-21
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The American standard rail waist sawing method to test the residual stress of the rail waist considers the comprehensive influence of the rail waist stress, but it can only qualitatively measure the size of the longitudinal residual stress of the rail waist, the error range is relatively large, and it cannot be measured, which has a great influence on the residual stress of the rail The vertical residual stress value at a specific point of the rail waist cannot accurately describe the expansion of the rail waist instability

Method used

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  • Test method for accurately detecting vertical residual stress of rail web of steel rail
  • Test method for accurately detecting vertical residual stress of rail web of steel rail

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Embodiment Construction

[0022] A test method for accurately detecting the vertical residual stress of rail waist.

[0023] (1) Select a section of 610mm long test rail, lay the rail on its side, the side of the rail head and the foot of the rail are in contact with the ground, and properly raise the side of the rail head so that the rail waist is parallel to the ground and is in a horizontal state;

[0024] (2) Find the vertical midpoint of the rail waist at both ends of the rail waist, and connect the two points with a straight line. The straight line should be parallel to the bottom of the rail, that is, the vertical center line of the rail waist, marked It is the first straight line 1. Similarly, on the other side of the rail waist, make a second vertical center line of the rail waist, which is marked as the second straight line 2 (see figure 1 );

[0025] (3) Starting from one end of the rail, mark a point every 100mm along the first straight line (both ends are not marked), and mark 3 points. T...

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Abstract

The invention discloses a test method for accurately detecting a vertical residual stress of a rail web of a steel rail. The method comprises the following steps of respectively finding midpoints on two sides of the rail web of the steel rail in the height direction, respectively drawing straight lines parallel to a rail bottom along the rolling direction of the steel rail through the midpoints, and defining the straight lines as vertical midlines of the rail web of the steel rail; and pasting strain gauges at different positions on the center lines of the two sides of the rail web in the vertical direction, acquiring an initial value after glue is dried, then cutting inwards in the longitudinal direction parallel to the center lines at the positions 10 mm away from the two sides of the center lines, and measuring a final value, namely the final vertical residual stress value of the rail web, after the residual stress of the rail web along the two sides of the center lines is completely released.

Description

technical field [0001] The invention relates to the technical field of physical detection, in particular to a testing method for accurately detecting the vertical residual stress of a rail waist. Background technique [0002] During the production process, the rails have to go through rolling, cooling, straightening and other processes. When the hot-rolled rail is slowly cooled on the cooling bed, due to the temperature gradient and microstructure transformation caused by the different cooling rates between the outer surface and the interior of the rail, a large thermal stress and phase transformation stress are generated. Under the action of thermal stress and phase transformation stress, the rail produces uneven plastic deformation, resulting in residual stress. At the same time, in the cooling process of the rail, due to the complexity of the rail section, the cooling speeds of the rail head, rail waist and rail bottom are different. The cooling speed of the rail waist a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 史文义张娜
Owner BAOTOU IRON & STEEL GRP
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