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Heat treatment technology for bearing ferrule

A bearing ring and process technology, applied in the field of bearing ring heat treatment technology, can solve problems such as decomposition and bearing size change, and achieve the effects of delaying crack propagation, enhancing stability, and alleviating stress concentration

Inactive Publication Date: 2016-12-14
C&U CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under normal circumstances, the retained austenite is an unstable phase. During the trial process of the bearing, the retained austenite will decompose, resulting in the dimensional change of the bearing.

Method used

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  • Heat treatment technology for bearing ferrule
  • Heat treatment technology for bearing ferrule
  • Heat treatment technology for bearing ferrule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] like figure 1 Shown is the process flow of the present invention, which is carried out according to the following steps: ①Spheroidizing annealing: raise the temperature to 780°C in the furnace, keep warm for 5h for annealing, then keep warm for 5h at 710°C, and then heat at 30°C / h The cooling speed furnace is cooled to 650 ℃ and air-cooled;

[0019] ②Quenching + Tempering, use 845°C, hold for 40 minutes, conduct a 160°C salt bath isothermal for 65 minutes, then take it out and air-cool, air-cool to room temperature, and then temper at 170°C for 6 hours.

Embodiment 2

[0021] like figure 1 Shown is the process flow of the present invention, which is carried out according to the following steps: ①Spheroidizing annealing: raise the temperature to 800°C in the furnace, keep warm for 6h for annealing, then keep warm for 6h at 720°C, and then use 30°C / h The cooling speed furnace is cooled to 650 ℃ and air-cooled;

[0022] ②Quenching + Tempering: Use 850°C, hold for 45 minutes, perform 160°C salt bath isothermal for 75 minutes, then take it out and air-cool, air-cool to room temperature, and then temper at 160°C for 8 hours.

Embodiment 3

[0024] like figure 1 Shown is the process flow of the present invention, which is carried out according to the following steps: ①Spheroidizing annealing: raise the temperature to 810°C in the furnace, keep warm for 4h for annealing, then keep warm for 5h at 690°C, and then use 30°C / h The cooling speed furnace is cooled to 650 ℃ and air-cooled;

[0025] ②Quenching + Tempering: Use 835°C, hold for 30 minutes, perform 150°C salt bath isothermal for 60 minutes, then air-cool, air-cool to room temperature, and then temper at 150°C for 6 hours.

[0026] The material content of the bearing ring under the existing technology and the above-mentioned embodiment is detected: the content of retained austenite is detected by X-ray method; the content of residual carbide is counted by image binary method; the remaining content is the martensite content. get as figure 2 The chart shown.

[0027] The wear test of the existing technology and the bearing rings of the above-mentioned exampl...

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Abstract

The invention relates to a heat treatment technology for a bearing ferrule. The heat treatment technology comprises the following steps: carrying out spheroidizing annealing on the bearing ferrule firstly, rising the temperature in a furnace to 780-810 DEG C, keeping the temperature for 3-6h, annealing the bearing ferrule, then keeping the temperature for 4-6h at the temperature of 680-720 DEG C, furnace cooling the bearing ferrule to 600-650 DEG C at the cooling speed of 20-40 DEG C / h, and tapping and air cooling the bearing ferrule; then quenching the bearing ferrule, adopting the temperature of 830-850 DEG C, keeping the temperature for 15-45min, carrying out a salt bath on the bearing ferrule at the temperature of 150-170 DEG C, carrying out isothermal holding for 60-80min, and then taking out the bearing ferrule, and air cooling the bearing ferrule to the room temperature; and finally, carrying out tempering on the bearing ferrule, air cooling the bearing ferrule to the room temperature, and carrying out tempering for 5-8h at the temperature of 150-180 DEG C. According to the heat treatment technology, the content of retained austenite in the bearing ferrule can be stabilized between 10-15 percent, so that the stability of the retained austenite is greatly strengthened; the retained austenite on the surface of a bearing can carry out inducible martensitic transformation in the very short using process from the start, so that the heat treatment technology has the advantages of good size stability, good abrasion resistance and good surface fatigue strength.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal materials, specifically a heat treatment process for bearing rings. Background technique [0002] The retained austenite has low hardness, and the retained austenite reduces the hardness of the bearing and reduces the wear resistance of the bearing. Under normal circumstances, retained austenite is an unstable phase. During the trial process of the bearing, the retained austenite will decompose, resulting in dimensional changes of the bearing. [0003] In conventional bearing heat treatment, GCr15 series bearing steel is mainly used for conventional martensitic quenching, and the parts contain a certain amount of unstable retained austenite. Therefore, for high-performance bearings, freezing treatment is often used to reduce the content of retained austenite, followed by tempering to complete the heat treatment. The result of heat treatment is improved dimensional stability, redu...

Claims

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Application Information

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IPC IPC(8): C21D1/32C21D9/40C21D1/18
CPCC21D1/32C21D1/18C21D9/40
Inventor 牛玉周郭长建陈旭光
Owner C&U CO LTD
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