At present, the commonly used hardening ability tests of sprocket are those

At present, the commonly used hardening ability tests of sprocket wheels are: end hardening test and immersion hardening test. The cooling capacity test mainly includes: cooling curve test, magnetic test, hot wire test and 5s test. In the cooling capacity test method, in addition to the probe cooling curve test method, the common weakness of other methods is that it is impossible to determine the distribution of the cooling rate in time, which is far from the actual quenching process. In recent years, the probe cooling curve test method has been modified and improved internationally on the instrument, trying to take into account the surface wetting, so that it is possible to further understand and analyze the true situation of the quenching and cooling process, and Make more detailed and reliable judgments about the performance of the cooling medium