A Method for Indirect Detection of Crack Depth
A crack and depth technology, which is applied in the detection field, can solve problems such as crack depth cannot be detected, and achieve an effect that is beneficial to product quality
Active Publication Date: 2016-03-09
BAOTOU NORTH VENTURE
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[0004] The purpose of the present invention is to provide a method for indirect detection of the crack depth in view of the problem that the crack depth at R6mm-R8mm of the brake beam frame cannot be detected
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Embodiment
[0011] By using the brake beam R6-R8 lifting table drilling and milling machine to produce the L-B brake beam frame, the R (arc radius) value of the mass-produced brake beam frame R6mm~R8mm is relatively fixed.
[0012] In the specific implementation process, on the premise that the brake beam magnetic particle flaw detector qualitatively determines that there are cracks at the R6mm~R8mm of the brake beam, before grinding the R6mm~R8mm of the brake beam, a suitable size R gauge and the system are selected. The R6mm~R8mm of the moving beam frame is attached, and a matching needle gauge is inserted into the gap between the R gauge and the R6mm~R8mm of the brake beam frame, and the diameter of the needle gauge d1 is recorded based on the fact that the needle gauge is just inserted; At R6mm~R8mm of the moving beam frame, smooth transition is required during grinding, and the surface roughness shall not exceed 50 μm. Grind until the cracks have been eliminated as judged by the naked...
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The invention relates to a method of detecting the depth of a crack indirectly. The method is characterized in that a radius gauge with an appropriate size is adopted for being attached to the R6mm-R8mm position of a brake beam frame, a matched pin gauge is inserted in an attaching gap between the radius gauge and the brake beam frame, the situation that the pin gauge is just inserted serves as the criterion, and the diameter d1 of the pin gauge is recorded; the R6mm-R8mm position of the brake beam frame is polished until a brake-beam-frame magnetic particle flaw detector detects that the brake beam frame is qualified, then the radius gauge is attached to the R6mm-R8mm position of the brake beam frame, another matched pin gauge is inserted in the attaching gap between the radius gauge and the brake beam frame, the situation that the pin gauge is just inserted serves as the criterion, the diameter d2 of the pin gauge is recorded, the polishing depth d is determined by calculating the difference between the diameters of the pin gauges, the polishing depth d satisfies the equation that d=d2-d1, and the value of the d is an approximate value of the depth of the crack. The method has the advantages of being convenient and rapid to achieve, visualized and accurate, changing a conventional method of detecting the depth of the crack only by sensation and visual inspection, solving the problem that the magnetic particle flaw detector only can determine the nature and cannot measure the depth of the crack, and being beneficial to guaranteeing product quality.
Description
technical field [0001] The invention relates to a method for indirect detection of crack depth, in particular to a method for indirect detection of crack depth at R6-R8 of L-B type brake beam frames, and belongs to the detection technical field. Background technique [0002] After the shot blasting treatment of the brake beam frame, it is required to conduct a magnetic particle inspection as a whole. No cracks are allowed. The crack depth is less than 0.5mm and can be eliminated by grinding. At present, the magnetic particle flaw detector of the brake beam can only qualitatively detect whether there are cracks in the brake beam, but cannot quantitatively determine the depth of the crack, especially the detection of the crack depth at R6mm~R8mm of the brake beam is very difficult. [0003] Therefore, it is necessary to find a method suitable for mass production to detect the crack depth at the R6mm~R8mm of the brake beam, change the previous method of detecting crack depth by...
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IPC IPC(8): G01B5/18
Inventor 张强王科中陈永祥张有巽范晓红赵军
Owner BAOTOU NORTH VENTURE