A Deformation-Phase Transformation Synergistic Spheroidization Method for High Carbon Chromium Steel Bearing Rings

Abstract

The invention discloses a high carbon chromium steel bearing ring deformation and phase transformation synergistic spheroidization method. The method comprises the following steps that S1, a bearing ring blank is heated to the temperature which is 30-50 DEG C above the material critical temperature Ac1, first-time heat preservation is carried out, then the bearing ring blank is subjected to furnace cooling to the temperature which is 10-30 DEG C below the critical temperature Ar1, and second-time heat preservation is carried out; S2, the bearing ring blank is quickly transferred from a heatingfurnace to a rolling ring machine for deformation of a warm rolling ring, the deformation of the warm rolling ring is controlled within 40%, and the finishing rolling temperature is controlled to bewithin 100 DEG C below Ar1; and S3, a bearing ring forging is placed in the heating furnace to be heated to the temperature which is 30-50 DEG C above the material Ac1, after heat preservation for a certain period of time, slow cooling in the furnace is carried out to be about 100 DEG C below Ar1, and air cooling is carried out to the room temperature. By means of the high carbon chromium steel bearing ring deformation and phase transformation synergistic spheroidization method, deformation and the temperature are perfectly matched, the synergistic effect of the deformation and the phase transformation on spheroidization of the tissue is fully played, and the adverse effect of the uneven deformation on the tissue performance is eliminated.

Description

technical field [0001] The invention relates to a bearing manufacturing technology, in particular to a high-carbon chromium steel bearing ring deformation-phase transformation coordinated spheroidization method. Background technique [0002] Bearings are the key basic parts for mechanical equipment to carry force and transmit motion. The inner and outer rings are the basic parts of the bearing. The manufacturing cost and quality almost determine the cost, performance and life of the bearing. The manufacture of bearing rings is the core of bearing manufacturing. High-carbon chromium bearing steel represented by GCr15 is the main material used in the manufacture of bearing rings. Due to its poor room temperature forming and processing performance, spheroidizing annealing has always been an essential and important process in the manufacturing process of bearing rings. The chemical annealing treatment makes the lamellar pearlite structure of the material spheroidized and transfo...

AI Technical Summary

Problems solved by technology

However, due to the non-uniform deformation characteristics of the ring rolling process, which has a large degree of deformation on the surface and a small degree of deformation on the core, the surface tissue of the warm-rolled ring bearing ring is fully spheroidized but the core is not fully spheroidized, and the core lamellar structure is biased. Too much, not only affects the uniformity of the structure, but also leads to high hardness, which affects the cutting process

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