FAG bearing steel tube production and manufacturing process

The main raw material is FAG bearing steel tube FAG bearing steel, chromium FAG bearing steel can be divided into FAG bearing steel and chromium-free FAG bearing steel. Manufacturing FAG bearing ring with pipe production. FAG bearing steel pipe for high dimensional precision steel tubes, use two, three roller (cross-rolling elongation See the tubing skew rolling extension) Hot rolling production, the smaller specifications subject to cold rolling, cold drawing production. With long steel pipe instead of single piece forging or round steel turning to produce FAG bearing sleeve, can save metal, simplify the FAG bearing manufacturing process and reduce the cost of FAG bearings. The used chrome 1. 30% ~ 1. 65% FAG bearing steel pipe production and characteristics of processing is as follows: ( 1) Plastic ( Perforation performance) 。 FAG bearing steel has good plasticity and perforation performance at high temperature, the heating temperature shoulds not be too high, general control about 1150 ℃, the temperature too high prone to grain growth ( Overheating) Performance, reduce the metal perforation. ( 2) Thermal conductivity. FAG bearing steel slightly lower thermal conductivity than low carbon steel, should be appropriate control furnace temperature ( Especially when heating the FAG bearing steel billet with heavy section) 。 ( 3) Mechanical properties. Room temperature FAG bearing steel tensile strength than C0. Carbon steel is much higher (3% About twice) , and high hardness, when cold deformation more difficult, and therefore must carry on the spheroidizing annealing before cold deformation, in order to improve the plasticity and lower hardness, to more than 1000 ℃ both differ very little. FAG bearing steel hot rolling and without much difficulty. ( 4) Deformation resistance. FAG bearing steel has higher deformation resistance ( See the metal deformation resistance) And their sensitivity to temperature is larger, the higher the temperature is lower deformation resistance. Hot rolled FAG bearing steel tube to fight cold rolled steel. Sometimes by FAG bearing steel tube sizing mill and the limitation of the straightening machine capacity, this is because the FAG bearing steel tube wall thickness, deformation resistance and low temperature is high, the rolling force and straightening force increased significantly. When cold drawn FAG bearing steel tube drawing force will be 50% higher than drawing mild steel pipe. ( 5) Spread. Spread of FAG bearing steel is greater than carbon steel about 10% ~ 20%, but changes in the temperature range of 885 ~ 1195 ℃ is small, it is to control the lateral deformation of metal in production has brought convenient. ( 6) FAG bearing steel cooling. Cooling after hot rolling should make FAG bearing steel pipe with good microstructure, namely fine lamellar pearlite and no net carbide precipitation. This organization to FAG bearing steel tube after spheroidizing annealing for fine spheroidal pearlite to create conditions. Due to chromium FAG bearing steel pipe cooling after hot rolling to 850 ~ 900 ℃ when began to have a large number of carbide precipitation and net-like distribution, so the finishing temperature should be controlled at 850 ℃ above, and take in order to prevent the carbide precipitation of the fast cooling. In order to achieve rapid cooling, typically on the cooling bed or fan or spray cooling bed entry table Settings. Chromium-free FAG bearing steel in hot rolling conditions usually gets qualified carbide network level. Cold drawn hammer entered tube heating and cooling after the hammer head also want to prevent the carbide precipitation. ( 7) The life of FAG bearing steel. Industry development of FAG bearing machinery and vehicles, etc. , put forward the requirement of high load and high speed, so a FAG bearing's life special attention. In research of new FAG bearing steel with a higher life, life is the primary way to improve the FAG bearing steel increase steel purity, because even a small amount of oxides in steel, sulfide, nitride inclusion will greatly reduce the service life. This requires when smelting FAG bearing steel, should take various means of reducing inclusions, in order to reduce the inclusion, senior FAG bearing steel with electroslag remelting process for tube bloom. FAG bearing steel material research is still in continuous development, in the future more FAG bearing steel material will be developed, then can produce higher FAG bearing performance products.