Hardness test of hardness meter

Using the Leeb hardness tester to test the hardness to analyze and verify the large tooth shaft, which have ring gear pretreatment process and carburizing quenching process method:

Pretreatment process testing:

The quality of this process operation directly affects the uniformity of the high quality hardness meter of the pinion and the ring gear inner carburized layer after the carburizing process and the deformation of the teeth. More importantly,the strength of the core is not penetrated. When using the Leeb hardness tester is to test the inner diameter and end face of the pinion.it is the shank of the pinion and the outer ring inner diameter of the ring gear, if the hardness meter in the same area of the test is found to be the greatest difference between the digital hardness meter and the lowest one, the temperature of the instrument is checked and the furnace is installed. Under the premise that the process cooling method is normal, foam shore hardness test can be inferred that there is segregation or banded structure in the workpiece within the workpiece according to the difference in the hardness gauge. Strips are segregated as shown in the metallographic picture.

Because the actual test with the hardness gauge tester is that the test point .which is the high in the ultrasonic hardness tester meterof the black pearlite belt, and the hardness gauge.the white ferrite belt is low. This structural defect is impossible to eliminate in the subsequent carburizing and quenching operation is retained. Once this large-scale pinion and internal ring gear have such defects, it will not only result in a short service life when installed, but also cause major equipment accidents. When we can infer the strip segregation in the forging by testing the barcol hardness tester method, we can use the solution treatment process or other processes to eliminate the strip segregation.immediately to eliminate the defects and prevent equipment accidents.