First, the ring deformation hardening factor

a, bearing steel and annealed in the original tissue defects resulting from the organization of carbide size, will result in uneven distribution of deformation hardening.

b, quenching thermal stress and the greater the stress, the greater the deformation hardening. Thermal stress and force include: heating temperature, heating rate and uniformity of cooling rate and uniformity of the cooling medium temperature.

c, ring size, residual stress when the vehicle processing, and vehicle processing resulting from changes in the diameter size, with the amount of change after quenching the size and consistent in direction.

Second, measures to reduce ring deformation hardening

a, strictly control the cooling rate, improve the quality of annealing. The size of the ball annealing cooling rate, directly affecting the carbide shape, size and dispersion, thus affecting the quenching and tempering process to develop, diameter variation and the final mechanical properties. Therefore, the development of annealing process on the right, while strictly controlling the cooling rate in the 10 ~ 25 ℃ / h, make the organization ready for the final heat treatment.

b, strictly control the car rings the changes in processing, can be seen from Table 2-63, after burning diameter is closely related to changes in deformation hardening. Lathe diameter variation is larger, the amount of change in diameter after quenching about big, but remained in the same direction. Therefore, to control the quenching diameter changes, the first diameter to strictly control the sewing process changes.

c, to meet the hardness and the premise of each organization, try to get lower quenching temperature, the furnace temperature control in three areas of the track the first zone due to lower furnace temperature, prolonged heating to slow heating rate, to ensure uniform heating rings , reducing the quenching diameter changes



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