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Annealing heat treatment (3)
Source: Bearing network time: 2013-07-10
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6202～6205 bearing blank: outer ring 4h; inner ring 4. 5h; large set small 5h.
6206～6406 bearing blank: outer ring 4. 5h; inner ring 5h; large set small 5h.
In order to reach the above holding time; use 720 °C soaking for 1h and then rise to the holding temperature; can reach the arrangement within a certain range to change abundantly. If in the practice of annealing the box with the mud seal, the operator is allowed to add 0. 5h.
(3) The selection of the cooling rate should be terminated at an appropriate arrangement; it is largely determined by the cooling rate. The cooling rate is not the same; it will have a different function arrangement. When the spheroidizing annealing is cooled; the pearlite transformation occurs; The cooling rate is different; the shape of the pearlite obtained; the shape, size and dispersion of the carbides are different; the cooling rate is large; the carbides are fine and diffuse; usually the hardness is high; the cooling rate is 蓟锟帕4 Winding.
The cooling rate required for the formation of spherical pearlite is usually controlled at 10 to 30 ° C / h; in order to ensure the quality of spheroidization; the cooling rate of 15 to 20 ° C / h is optional. In the process of production and production; The room temperature has a great influence; usually, the cooling rate is closely related to the room temperature; it can be based on the temperature difference of the time; there are two kinds of processes. It may be urgent according to the mission; it is allowed to be baked at 500 °C; the box is opened below 300 °C. The aluminum silicate fiber felt is used for repair. A box-type electric furnace; a partition wall is made between the furnace door and the box with aluminum silicate fiber felt; the heat dissipation of the furnace door is avoided; the temperature difference is reduced; the box is covered with the mud seal and the furnace is sealed; The gap should be more than 20mm; it should be ensured that there is a gap of more than 50mm between the annealing box and the electric heating body.
Sampling is viewed in three boxes in front of the furnace, in the furnace and in the furnace; a total of 9 workpieces in the upper, middle and base layers are extracted for routine viewing. Usually the GCr15 bearing steel blank forgings have an annealing hardness of HRB88-94 and a fiber arrangement of 2 to 4 grades; Decarburization layer depth of 0. 2 ~ 0. 3mm; annealing quality can reach the demand of JB / T1255 ~ 2001 high carbon chromium bearing steel rolling bearing parts heat treatment skills.
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