Hudong Electric Power Depot, Datong 373001, China The traction motor is the main motor that drives the moving axle of the locomotive. It is the main component of the electric locomotive. Its performance directly affects the traction of the locomotive, and the traction motor shaft is subject to greater forces and working conditions. It is prone to fatigue. For example, on May 25, 1996, the 3rd traction motor shaft of the Locomotive 38186 Locomotive Division of Hudong Electric Power Co., Ltd. was broken, causing a machine breakdown and directly affecting the transportation safety. The determination of the 2 flaw detection method was analyzed from the traction motor shaft force situation. From the inside of the mounting pinion to the inside of the bearing mounting, that is, from the shaft end, (1), between the larger and the inside of the gear and the bearing mounting surface, the stress is concentrated and fatigue cracks often occur. 318 Locomotive armature shaft break occurs and the inner side of the mounting surface is smooth by the mounting surface of the segment wheel. Maintenance, D to use magnetic particle testing methods; bearing mounting surface due to the difficulty of pulling off the inner sleeve, while the inner oil seal ring extends outward about 10, will be here transitional pressure crushed, so that the fatigue cracking area is not easy to find, therefore, Ultrasonic testing of fatigue cracks here 3 flaw detection method flaw detection method of small-angle longitudinal wave normal incidence. ! Added to the long people sawing.

The detection surface is the shaft end surface, and the surface roughness is not greater than 312 and the oil coupling is adopted.

4Flaw Detection Sensitivity and Time Baseline Adjustment Detecting Sensitivity At the end of the shaft, the probe is placed above the thimble hole so that the sound beam is aligned with the person who is deep in the physical test block 1 sawing. Adjust the waveform, people bell; mouth wave in 4.6 grids and 6.5 grids respectively, the wave height is 8 full shots of the screen, and 1 baseline adjustment. Adjust the instrument, take the appropriate depth file, and make the defect wave easily discernible. When the baseline is adjusted to 300, then each cell on the screen is 30,5. The 3 probes are placed on the top of the shaft at the end of the shaft and the coupling is good. Appropriately, move the probe in a zigzag manner to align the acoustic beam at the bearing mounting surface for scanning. When a crack wave occurs, locate the quantitative defect. When the crack appears, calculate the crack defect based on the position of the flaw wave from the time base line. Quantitative, using the equivalent method, the wave height will be the same, then the crack depth and test block depth are the same.

For the reflected waves above or below the test block kerf, 1 curve can be used for quantification, and the corresponding crack depth can be found at different wave heights under sensitivity. 2 The crack length is measured by the mobile probe of the circumferential length, and the wave height is maximized and adjusted by the attenuator. , Adjust the wave height to 8 volumes, and then move the probe in the circumferential direction until the waveform height is 4 off. This is the length of the arc between the point where the wave height at the other end is 4 off and the crack length.

Crack wave characteristics. The crack wave is straight, the wave peak is sharp and sharp, and it is steep and steep. Because the crack has depth, when the probe moves up and down, the waveform has a moving distance on the time base line. At the same time, the waveform changes from high to low or from low to high. The crack has a fixed circumferential length, so the probe moves circumferentially, the position of the crack wave does not change, the height changes smoothly, and the relationship between the depth of the continuous 2 crack and the height of the wave increases or decreases regularly.

6 Attention should be paid because the armature shaft end surface has a 4 PCT 20 hole for fixing the pinion baffle, which affects the detection surface. At the same time, the acoustic beam at the bearing mounting surface corresponding to the screw hole cannot be scanned, resulting in a blind area. , it is possible to make the length shorter. Small cracks with shallow depths are missing. Therefore, move the probe near the screw hole to slow down. At the same time, the probe should swing around 3 and pay attention to the change of waveform at any time.

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