Heat treatment technology for reducing deformation of GCr15 thin-wall conical ring

Abstract

The invention discloses a heat treatment technology for reducing deformation of a GCr15 thin-wall conical ring and belongs to the field of heat treatment technology. The technology comprises the following steps: 1) machining of a spheroidized annealed blank into a thin-wall conical ring part; 2) crating; 3) front cleaning; 4) quenching: thermal insulation at 720 + / - 10 DEG C for 20 + / - 1 min, and carbon potential is 0.5 + / - 0.025%; thermal insulation at 780 + / - 10 DEG C for 20 + / - 1 min, and carbon potential is 0.5 + / - 0.025%; thermal insulation at 820 + / - 10 DEG C for 45-90 min, and carbon potential is 0.9 + / - 0.025%; and cooling in 130 + / - 10 DEG C of quenching oil; 5) post cleaning; and 6) tempering: tempering temperature is 185 + / - 5 DEG C, and time is 150 + / - 10 min. According to the invention, deformation of the thin-wall conical ring part after heat treatment is reduced, grinding allowance after heat treatment is decreased, grinding cost after heat treatment is lowered, and first pass yield for heat treatment reaches 100%.

Description

technical field [0001] The invention relates to a heat treatment process, more specifically, to a heat treatment process for a GCr15 thin-walled cone ring, which is used to reduce heat treatment deformation of the GCr15 thin-walled cone ring. Background technique [0002] figure 1 It is a structural schematic diagram of a GCr15 thin-walled cone ring, which is used in the transmission bearings of miniature automobiles and requires wear resistance and high toughness. At present, for the heat treatment of this kind of GCr15 thin-walled cone ring, the conventional process is to use the mesh belt furnace production line to heat, quench and temper. The GCr15 thin-walled cone ring parts processed by this method have large deformation, and only a large amount of grinding residue can be reserved. Quantitative or manual calibration, large post-processing allowance after heat treatment, high machining cost, and the yield rate is only about 65%. Manual calibration of some parts will ca...

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Problems solved by technology

[0006] It is not difficult to find that in the above-mentioned disclosed technical solutions, the starting point is how to improve the hardness of the GCr15 bearing ring to prolong the service life of the bearing, but the deformation problem of the GCr15 thin-walled parts during the heat treatment process is ignored.

Due to the different heat treatment process, the GCr15 thin-walled cone ring parts will also have different degrees of distortion during the heat treatment process, and the deformation of the heat treatment leads to a large grinding allowance for the thin-walled cone ring, which increases the subsequent machining. The cost of manual correction is easy to produce cracks at the stress concentration, which is also the main defect in the heat treatment process of thin-walled cone ring parts

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