Novel high-environmental-protection bearing quenching process

Abstract

The invention discloses a new high-environmental protection bearing quenching process. The technical proposal is: the bearing parts are carburized at 920-950 degrees for 70-150 hours, cooled to 880-900 degrees in the furnace, and then entered into a water base of 20-50 degrees. In the quenching liquid, quench for 40 seconds to 2 minutes and 30 seconds to 150 to 230 degrees, air cool to 50 to 80 degrees, enter high temperature tempering at 600 degrees for 9‑11 hours to 650 degrees for 11‑13 hours, and finally air cool to room temperature. Reduce the quenching speed of the bearing, and the bearing parts intrude into the water-based quenching liquid at a temperature of 880-900 ° C, so that the high-temperature bearing parts with a large surface area are in contact with the water-based quenching liquid, generating water vapor, which turns into white smoke and melts into the atmosphere . The quenching medium of the present invention adopts water-based quenching liquid. The water-based quenching liquid is formulated from polyamine polymers with excellent stability and unique composite additives, and has a clean production environment, no combustion, and no smoke. Gas, no fire hazard, high environmental protection, low risk factor.

Description

Technical field: [0001] The invention relates to a bearing quenching process, in particular to a new high-environmental bearing quenching process. Background technique: [0002] As we all know, in the bearing industry, large and extra-large bearings used for working under impact load conditions are mostly made of carburized bearing steel, especially rolling mill bearings, almost all of which are made of carburized bearing steel. The commonly used materials are: G20Cr2Ni4A, G20Cr2Mo. In order to exert the mechanical properties of the above materials, the materials need to be quenched to achieve high hardness, high wear resistance and long life. Due to the limitations of the traditional theory, in order to avoid quenching cracking of carburized bearing steel workpieces during quenching, the quenching medium is all mechanical oil. When the 880-900 ℃ high-temperature workpiece with a large surface area is quenched in contact with mechanical oil, a large amount of black smoke wi...

AI Technical Summary

Problems solved by technology

This will not only cause pollution to the surrounding environment, but also cause certain harm to the operator's body due to the poison in the black smoke

At the same time, when the mechanical oil with a flash point of about 200°C is in contact with the workpiece at a high temperature of 880-900°C, it is easy to burn and catch fire, which brings certain safety hazards to the surrounding environment.