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Method for ultrasonic inclusion detection of train wheels

A technology of inclusions and ultrasound, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve wheel subsurface fatigue damage, insufficient effectiveness of risk prevention and control, Uncertain correspondence and other issues, to achieve the effect of improving effectiveness, wide application range, and simple steps

Inactive Publication Date: 2018-05-29
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, all countries use ultrasonic flaw detection to inspect large oxide inclusions in ex-factory wheel products. However, due to the uncertain correspondence between the "equivalent" of defects found by ultrasonic flaw detection and defects, the effectiveness of risk prevention and control is obviously insufficient, and wheel rims often contain defects. Subsurface fatigue damage occurs on wheels whose "equivalent" is much lower than the product standard requirements

Method used

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  • Method for ultrasonic inclusion detection of train wheels
  • Method for ultrasonic inclusion detection of train wheels
  • Method for ultrasonic inclusion detection of train wheels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: An ER8 wheel (the chemical composition and rim tensile strength of which are shown in Table 1) whose rim was found to have defects during the on-line ultrasonic flaw detection inspection was subjected to manual ultrasonic flaw detection to determine its orientation and position. Inspection from the inner side shows that the defect equivalent is Φ1dB, and inspection from the tread surface shows that the defect equivalent is Φ1-8dB, so it can be judged that the defect is a strip defect along the circumferential direction of the rim. The defect is located on the inside of the rim, approximately 60 mm from the inside of the rim. After cutting off the cross-sectional test block, use wire cutting method to cut a 120mm length from the inner surface along the axial direction, and the cross-sectional size is 25×25mm square bar, and the positioning point of the defect is located at the center of the square bar section. The square bar (sample square bar) sample is proce...

Embodiment 2

[0026] Embodiment 2: AAR C wheel (its chemical composition and rim tensile strength such as figure 1 Shown), cut off the cross-sectional test block and conduct ultrasonic flaw detection to judge its orientation and position. Inspection from the inner side shows that the defect equivalent is Φ1+4dB, and inspection from the rim tread surface shows that the defect equivalent is extremely small, so it can be judged that the defect is a strip defect along the radial direction of the rim. Locate the defect on the inside of the rim, approximately 55mm from the tread. After cutting off the cross-section test block, use wire cutting method to cut a square bar with a length of 110mm and a cross-sectional size of 25×25mm in the radial direction from the surface of the tread. The positioning point of the defect is located at the center of the square bar section. The square bar is processed into a test sample, and the four long-diameter surfaces of the sample are ground and subjected to m...

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Abstract

The invention provides a method for ultrasonic inclusion detection of train wheels. The method is applied to the technical fields of train wheel manufacturing and performance detecting processes. Themethod comprises the following steps: (1) performing ultrasonic flaw detection on a rim inner side surface and a rim tread of a train wheel, and determining that a detection surface with a strong defect reflection signal is parallel to a length direction of an inclusion; (2) cutting a cross section sample of a rim which contains the inclusion, and taking a sample square rod by linear cutting, wherein the inclusion exists in the middle of the sample square rod; (3) by taking the sample square rod as a sample, performing micro-particle shot blasting on the sample; and (4) applying a stair load fatigue test on the sample, wherein an initial load is lower than a fatigue limit of surface fatigue, and under a load load, ensuring that a fatigue crack cracks and expands from the inclusion. The method provided by the invention can completely display the full view of the inclusion which is discovered by ultrasonic flaw detection and can accurately measure the size of a defect.

Description

technical field [0001] The invention belongs to the technical field of railway wheel manufacturing and performance testing technology, and more specifically relates to a method for ultrasonic detection of inclusions on railway wheels. Background technique [0002] During the operation of railway wheels, if there are large oxide inclusions (≥1.0mm) in the 10-20mm area under the rim tread, under the action of contact stress between the wheel and the rail, fatigue cracks will be generated and expanded, causing the cracks to penetrate the rim and produce a subsurface Fatigue damage, such as cracks that cannot be detected in time, may cause a large piece of metal on the rim to fall off during operation, which may cause the train to derail and cause a major traffic accident. Therefore, the control of large oxide inclusions (inclusions) is one of the most important quality control requirements for railway wheels. Surface fatigue damage plays a key role. At present, all countries ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N29/048G01N2291/2675
Inventor 江波鲁连涛邹强曾东方肖峰宫彦华陈刚杨峥
Owner MAANSHAN IRON & STEEL CO LTD
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