Bearing - Method of heat treatment process

Bearing - Heat treatment method of every kind bearing after heat treatment processing step 棸, will encounter some problems in the process of heat treatment and refuse all what we do, bearing also is such, bearing heat treatment of the need to learn skills, understand the type furnace, furnace, cooling medium, workpiece size, the shape and workpiece many elements such as skill requirements. In the case of don't understand, can find the relevant materials ( For heat treatment, etc. ) , or for the return to give directions, making a test of knowledge, and then produce formal. Engineer today, you can share it bearing heat treatment skills, some basic concepts, expect some help to you. 1, annealing operation method: heat the steel to Ac3 + 30 ~ 50 degrees or Ac1 + 30 ~ 50 degrees or after temperature under Ac1, bearing usually with slow cooling furnace temperature. Intention: 1) 。 Plastic drop in hardness, improvement, improvement of machining and pressure processing function; 2) 。 Refine grain and improve the mechanics function, in preparation for the next working procedure; 3) 。 Eliminate the internal stress of cold and hot working what had happened. 2, quenching operation method: heat the steel to the phase transition temperature above Ac3 or Ac1, bearing in heat preservation for a period of time, and then in the water, nitrate, oil, or the rapid cooling in the air. Intention: quenching is usually in order to get high hardness martensite arrangement, sometimes, for some high alloy steel ( Such as stainless steel, wear-resistant steel) The quenching, is in order to get a single homogeneous austenitic arrangement, bearing in order to progress the abrasion resistance and corrosion resistance. Using the key: 1) 。 Usually used for carbon content is more than zero point three percent of the carbon steel and alloy steel; 2) 。 Quenching can give full play to the potential strength and wear resistance of steel, but together will constitute the internal stress of large, drop the plasticity and impact toughness of steel, tempering bearing will be conducted to get good mechanical function. 3, operation method of aging: steel heating to 80 ~ 200 degrees, insulation 5 ~ 20 hours or longer time, and then out with furnace cooling in the air. Purpose: 1. The arrangement of the safe steel after quenching, reduce the deformation of the register or use time; 2. Reduce internal stress after quenching and grinding, safe shapes and dimensions. Using the key: 1) 。 Is appropriate for all steel after quenching; 2) 。 Bearings are often used to shape change of the workpiece, no longer demand such as tight screw, measurement and lathe bed chassis, etc. 4, cold treatment methods: operation of steel after quenching, the low temperature medium ( Such as dry ice and liquid nitrogen) The cooled to 60 ~ 80 degrees or lower, uniform temperature after take out together mean temperature to room temperature. Make harden steel residual austenite in all or most of the converted into martensite, and then the progress of the steel hardness, strength, abrasion resistance and fatigue limit; Secure the arrangement of the steel, in order to secure the shape and dimension of steel. Using the key: 1) After the steel quenching should carry out the cold treatment, and then by the low temperature tempering, to eliminate the internal stress of the cryogenic cooling. 2) Cold treatment first applied to alloy steel cutting tools, measuring tool and tight parts. 5, induction heating surface quenching operation method: steel to be included in the sensor, the induced current in the surface layers of steel, bearing within a very short time heating to the quenching temperature, then water spray cooling. Intention: progress steel surface hardness, wear resistance and fatigue strength, heart department insist on patience. Using the key: 1) Used for medium carbon steel and central scroll alloy steel layout more; 2) Because of skin effect, usually in the form of high frequency induction quenching hardening layer 1 ~ 2 mm, medium frequency quenching is usually 3 ~ 5 mm, usually more than 10 mm high frequency quenching. The above information is simple introduction bearing - engineer Heat treatment process, if have not understand can online consulting professional service engineers: Lu Tianze - 0769 22987612, 13827223590 = = = = = = = = = = = = = recommended reading: 【 Three characteristics of miniature bearing heating 】 = = = = = = = = = = = = =