First, use the Leeb hardness tester to test the hardness to analyze and verify the large cog, the inner ring gear pretreatment process and the carburizing and quenching process:
Post-treatment process test
The quality of this process directly affects the uniformity of the hardness distribution of the carburizing layer and the inner ring gear carburizing layer after the carburizing process operation, and the deformation of the tooth portion. More important is the strength of the core (unpermeable layer).
When using the Leeb hardness tester to test the tooth portion and the shank of the pinion, the inner diameter and the end surface of the inner ring of the ring gear, if the difference between the highest and lowest hardness of the same area is found to be large, the temperature of the instrument and the method of loading the furnace are examined. Under the premise that the process cooling method is normal, it can be inferred that there is segregation or band structure in the workpiece according to the difference of the hardness value and the distribution.
Because the test by the hardness method is that the test point is high in the pearlite band of the black, and the hardness of the white ferrite band is low. This tissue defect is not likely to be eliminated in subsequent carburizing and quenching process operations, but is retained.
When we test the hardness method by the Leeb hardness tester, it can be inferred that after the strip segregation in the forging, the solution treatment can be used immediately or other processes for eliminating the band segregation can eliminate the defects, thereby preventing equipment accidents, Reduce losses.
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