Ultrasonic testing method and device for sample axis
An ultrasonic and axle technology, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as degraded use, low work efficiency, and pulled axles.
Active Publication Date: 2019-03-22
DATONG ELECTRIC LOCOMOTIVE OF NCR
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Problems solved by technology
[0003] For the repair of surface fatigue crack defects on locomotive axles, the conventional method is to remove the wheels, gears, axle boxes, axle boxes and other parts mounted on the axles and use magnetic particle inspection to ensure the quality of the outer surface of the axles. The cold pressing technology is used in the press assembly, and the axles are often strained during the unloading process during maintenance. This situation is as high as 40%-60%. The strained axles can only be downgraded for use, and even serious Scrapping wastes cost and reduces work efficiency
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[0025] In order to have a clearer and more comprehensive understanding of this patent, its specific implementation methods are now described as follows:
[0026] The detection sample shaft of this patent is manufactured by the following method:
[0027] First, use the same material as the overhauled locomotive and vehicle axle (such as: A1N, 35CrMoA, EA4T, JZ35, etc.) to make a finished axle; this axle needs to be refined through forging, heat treatment, rough turning and fine turning. , the grain size of the testing shaft is ≥ 8 grades; the roughness of the end surface and the outer surface of the shaft reaches the Ra ≤ 6.3 μm required by the testing standard, and then the testing shaft is subjected to an ultrasonic sound permeability test (defects are not allowed inside the shaft) ), after passing the inspection, just obtained the finished rolling stock axle shaft of prior art.
[0028] The rolling stock inspection sample shaft needs to process three kinds of artificial def...
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Abstract
The invention relates to a method and device for detecting a sample axle through ultrasonic. The method comprises the steps that by means of a detected sample axle, a sensitivity compensation value which is discrepant with an axle of a physical locomotive vehicle to be maintained is obtained, correction is conducted on an ultrasonic fault detector, and the situation that defects of fatigue cracks of a wheel seat part, an axle journal part and a gear seat part of the axle of the locomotive vehicle can be rapidly and accurately detected by adopting an ultrasonic technology under the condition that a wheel set of a locomotive under repairing is not disassembled is achieved. When the axles of a large number of locomotive vehicles under repairing need to be detected on the surface fatigue cracks through the ultrasonic technology, the axles of the locomotive vehicles under repairing can be detected correspondingly on the premise of not being disassembled. By means of the method for detecting the sample axle through the ultrasonic, the detection result is accurate and reliable, detection can be achieved without disassembling the wheel set, therefore, the detection efficiency is greatly improved, and meanwhile the detection cost is reduced.
Description
technical field [0001] This patent is aimed at checking the cracks in the fatigue area by using the ultrasonic testing method and device to check the fatigue area of the electric locomotive axle without disintegration in the maintenance process, so as to ensure its normal use. Background technique [0002] In the process of railway development towards high speed and heavy load, transportation safety is the first to bear the brunt. The axle of rolling stock is one of the most important components related to the safety of railway transportation. It plays a decisive role in the driving safety of the locomotive. Therefore, whether it is a new system or an overhaul, 100% ultrasonic flaw detection and magnetic particle flaw detection must be carried out to ensure the driving safety of the locomotive. Among them, ultrasonic flaw detection is used to detect internal defects of the axle, while magnetic particle flaw detection is used to detect surface defects of the axle. [0003]...
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IPC IPC(8): G01N29/04
Inventor 余海军
Owner DATONG ELECTRIC LOCOMOTIVE OF NCR