Heat treatment effect on the stability of the bearing

Heat treatment is the most before the bearing manufacturing process and the final process, the influence on the performance of the bearing, the essence of which is the solid metal by heating and heat preservation and cooling method and change its internal organization to achieve the expected performance of the technological process, including annealing, normalizing, quenching, tempering, etc. Quenching is just heated to AC - bearing - ACm between a certain temperature, holding time, making them part of the austenite, and then at greater than the critical cooling rate in the process of cooling medium for cooling. This process helps to improve the hardness of steel strength, abrasion resistance and fatigue resistance, and through the later part of tempering, the steel higher comprehensive mechanical properties. The microstructure after quenching tempering martensite is the most reasonable goal in 883. Accounted for 5%, carbide 6. 5%, 10% retained austenite. Tempering is to harden steel heating to AC below a certain temperature, heat preservation after a certain period of time, the process of cooling to room temperature. Tempering can eliminate internal stress, prevent craze, stable and can be stable, and the organization size, can burn under the condition of lower hardness, greatly improve the toughness. In order to ensure the product size and performance, temperature tempering temperature should not be lower than work, generally is 30 - 50 degrees, 120 degrees by 150 - working temperature of bearing parts 180 tempering temperature, 200 degrees above tempering is called high temperature tempering, temper is generally 2 - 4 hours. More knowledge of bearing welcome call jiaxing bearing group sales co. , LTD. , we will serve you wholeheartedly.