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Steel rail residual stress testing method

A technology of residual stress and testing method, applied in the direction of force/torque/work measuring instrument, measuring device, instrument, etc., can solve the problem of large geometric shape error, etc., achieve good incision size accuracy, high workpiece cutting surface quality, release less disturbing effect

Inactive Publication Date: 2020-04-10
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional rail waist sawing method uses alloy saw blades for cutting, which is affected by factors such as vibration, cutting speed, geometry and size of the tool during cutting, and the geometric shape error generated during processing is relatively large.

Method used

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  • Steel rail residual stress testing method
  • Steel rail residual stress testing method
  • Steel rail residual stress testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] A test method for rail residual stress, comprising the steps of:

[0025] 1. Sample preparation

[0026] Take samples from the rail beam factory, take a 610mm long rail at a place as far as possible from the end of the finished rail (≥ 3m), mark the rail head and bottom of the rail central axis, and use a vernier caliper to measure each mark on the rail section before the cut. point spacing. The distance between the mark position and the top and bottom of the rail is 6mm, and the distance between each point is 10mm, which are marked as AA', BB', CC', DD', EE', such as figure 1 shown.

[0027] 2. Rail waist sawing

[0028] Use the special molybdenum wire cutting machine for wire cutting to cut the center and axis of the rail along the direction of the rail waist. The height of the cut position from the bottom of the rail is as follows:

[0029] Table 1 Rail Waist Cutting Position

[0030]

[0031]

[0032] The processing range is required to be ≥400mm, and the...

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Abstract

The invention discloses a test method for testing residual stress of a steel rail by adopting a rail web notching method. The test method comprises the following steps: 1) preparing a sample; 2) cutting a rail web; and 3) performing measuring. A linear cutting machine tool is used for cutting, the notch surface quality is good, and macroscopic cutting force in machining is avoided; the length of asample is 600 mm, a molybdenum wire is a molybdenum wire special for 0.18 mm linear cutting, the length of a notch is 400 mm, computer programming control is adopted in the cutting process, and the size precision of the notch is high. Residual stress displacement value measurement is performed by using an average value method so as to reduce measurement errors; a vernier caliper is used for measurement, and the displacement value (+ or-) is required to be smaller than or equal to 3.75 mm.

Description

technical field [0001] The invention relates to the fields of metallurgy and metal materials, in particular to a method for testing residual stress of steel rails. Background technique [0002] There are many methods for measuring the residual stress of rails, mainly including segmentation method, strain gauge method, sawing method, perforation method, X-ray diffraction method, neutron diffraction method and ultrasonic stress measurement method. Most of them are mainly destructive rail waist sawing and cross-section sawing, and both have been adopted into the rail standard. In the rail technical conditions AREMA-2009 standard of the American Railway Engineering and Maintenance Association, the evaluation method of the residual stress in the rail adopts the rail waist sawing method. [0003] The traditional rail waist sawing method uses alloy saw blades for cutting. Due to the influence of vibration, cutting speed, geometric shape and size of the tool during cutting, the geo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 郑瑞高峰苏航史文义边影王慧军赵桂英徐楠薛虎东董捷王嘉伟
Owner BAOTOU IRON & STEEL GRP
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