Method for testing residual stress of steel rail

A technology of residual stress and testing methods, applied in the direction of measuring force, measuring devices, instruments, etc., can solve the problems of unqualified rails and unscientific testing methods

Inactive Publication Date: 2013-08-07
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no requirement for the stress value of other parts of the rail, but when the stress value exceeds the specified value, what causes it, and th...

Method used

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  • Method for testing residual stress of steel rail
  • Method for testing residual stress of steel rail
  • Method for testing residual stress of steel rail

Examples

Experimental program
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Embodiment

[0010] Example: Baotou Steel 60kg / m material is U75V steel rail and 20 samples are taken on site for testing.

[0011] 10 rails with a specification of 60kg / m×1000mm were first sampled on site, and the residual stress was tested on 10 rails. The values ​​are as follows (unit: MPa):

[0012] Table 1 Residual stress values ​​at each point of 1#-10# rail

[0013]

[0014] It can be seen from the above results that the stress value of the rail bottom is too large, because the standard only requires the stress value of the rail bottom, which cannot be greater than +250MPa. 2#, 4#, 5#, 7#, 8#, 10# all exceed the standard value and are unqualified. The rest are also close to the maximum value, and the general stress is on the high side. We analyzed this batch of steel rails and preliminarily determined that the straightening process was unreasonable. We adjusted the straightening process. The straightening machine of Baotou Rail Beam Factory is a 9-roller straightening machine, ...

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Abstract

The invention relates to a method for testing residual stress of a steel rail. The method is characterized by comprising the following steps of using a steel rail with the length of 1m, taking one point (namely a center position) 500mm away from the end of the steel rail, drawing a line which is arranged at the point in the circumferential direction vertical to the axis of the steel rail, sequentially and alternatively taking 14 points from the center point of the rail bottom to the center of the rail head in the linear direction, attaching each point with a strain sheet, measuring the initial value of the residual stress of each point by a static stress-strain gage, using the line drawn on the steel rail as a center line, cutting steel rail into 20mm thin sheets at each 10mm part of the two ends of the center line in the direction vertical to the axis of the steel rail, and then measuring the final value of the residual stress of each point by the static stress-strain gage. The method has the advantages that by adopting the multi-point testing, the stress distribution conditions of the rail bottom, the rail waist, the rail head and other parts are acknowledged, the stress change of each point is analyzed, then the pressing amount of a rolling machine is corrected, and the distribution of the residual stress is adjusted, so the steel rail is qualified.

Description

technical field [0001] The invention relates to a method for testing residual stress of rails, belonging to the field of residual stress testing. Background technique [0002] The rail residual stress test, taking Baotou Steel as an example, adopts the European standard prEN13674-1 "Heavy Rails for Railway Tracks". The standard provides a detection method for the detection of the rail bottom. , Measure the stress value, the highest stress value cannot exceed 250MPa, to judge whether the rail stress value is qualified. There is no requirement for the stress value of other parts of the rail, but when the stress value exceeds the specified value, what causes it, and the stress value of other parts is unknown, so the existing detection method is unscientific, and the rail after detection cannot be guaranteed. its qualified. Through multi-point testing, the cause can be found out, and the stress changes at each point can be analyzed, so as to correct the reduction of the rollin...

Claims

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Application Information

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IPC IPC(8): G01L1/00
Inventor 李国杨贵全
Owner INNER MONGOLIA BAOTOU STEEL UNION
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