JB/T 8566-1997 JB/T 8566-1997 Rolling bearing parts Carbon steel ball bearing rings Heat treatment technical conditions JB/T8566-1997 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T8566-1997
Rolling Bearing Parts
Technical Conditions for Heat Treatment of Carbon Steel Ball Bearing Rings
1997-04-15 Issued
Ministry of Machinery Industry of the People's Republic of China
1998-01-01 Implementation
JB/T8566-1997
This standard is a revision of the technical conditions for heat treatment of carbon steel ball bearing rings of JB/CQ/T130-91≤+, and is formulated as the first industry standard. This standard mainly revises the technical requirements for forging of bearing rings and the hardness and microstructure after tempering in the original standard, and supplements the fracture characteristics after quenching and tempering and the inspection rules for hot pickling. Appendix A of this standard is the standard summary. Appendix B of this standard is the indicative appendix.
This standard was proposed and approved by the National Technical Committee for Standardization of Hydrodynamic Bearings. The drafting units of this standard are: Luoyang Bearing Research Institute of the Ministry of Machinery Industry and Dazhu Bearing Factory. The main drafters of this standard are: Yang Qiaoling, Wang Jiejun and Chen Wei. 1 Scope
Standard of the Machinery Industry of the People's Republic of China
Rolling Bearing Parts
Heat Treatment of Carbon Steel Ball Bearing Rings
Technical Conditions
JB/T 8566—1997
This standard specifies the technical requirements, inspection methods and inspection rules for deep groove ball bearing rings made of 45 high-quality carbon structural steel that conforms to (GB699% Technical Conditions for High-quality Carbon Structural Steel) after forging and quenching and tempering. The standard applies to the heat treatment quality inspection of bearing rings made of this steel and finished parts during the process. For bearing parts with special requirements, the provisions of the product drawings shall be followed. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision: parties using this standard should explore the possibility of using the most recent version of the following standards. GB 224---87
GB 230 91
GB 231-84
GB699-88
JB 1255—91
Technical requirements
Method for measuring the depth of decarburized layer of steel
Metal Rockwell hardness test method
Metal Brinell hardness test method
Technical conditions for high-quality carbon structural steel
Technical conditions for heat treatment of rolling bearing parts of high-carbon chromium bearing steel 3.1 Technical requirements after forging
The hardness of forged rings should not be greater than 241 HB. The indentation diameter should not be less than 3.9 mm. 3.2 Technical requirements after tempering
3. 2. 1 Hardness
3.2.1.1 The hardness of the ferrule after tempering shall not be less than 50HRC. 3.2.1.2 For ferrules with an outer diameter not exceeding 100mm, the hardness difference of the same part shall not be greater than 2.0HRC: For ferrules with an outer diameter greater than 100mm, the hardness difference of the same part shall not be greater than 3.0HRC. 3. 2. 2 Microstructure
3.2.2. The microstructure of the ferrule after tempering shall be composed of martensite. The martensite structure shall be evaluated according to the first level diagram (see Figure 1), and the 1st to 3rd levels shall be qualified.
3. 2.2.2 Under the condition of qualified hardness, the martensite structure shall not be controlled. 3. 2. 3 Fracture
After quenching and tempering, the ferrule shall be a light gray porcelain-like fracture with braiding. Flat gray-white, large granular, crystalline overheated fracture and fibrous dark gray underheated fracture with braiding are not allowed to exist. 3. 2. 4 Cracks
Front rings are not allowed to have cracks after tempering.
Approved by the Ministry of Machinery Industry on April 15, 1997
Implemented on January 1, 1998
3.2.5 Decarburized layer
Level 2
JB/T8566-1997
Level 1
Horse body structure
Figure 1 Level 1 Figure 500×
Front ring decarburized layer depth after quenching and tempering should not be greater than 2/2 of the minimum processing allowance on one side 3.3.2.6 Deformation of ferrules
Front ring deformation after tempering can be controlled by referring to Appendix B (Reminder Appendix). 4 Inspection methods and test rules
4.1 Hardness test
4.1.1 Brinell hardness test method shall be in accordance with the provisions of GB231. 2
Level 3
JB/T8566-1997
4.1.2 Hardness test method shall be in accordance with GR230. 4.1.3 Hardness of the ferrule shall be measured on the end face. In case of disagreement, the hardness measured near the working face of the ferrule shall prevail. 4.2 Microstructure inspection
4.2.1 Microstructure of the ferrule shall be evaluated at 500 times. It is also allowed to be carried out at 450-500 times: but the influence of magnification shall be considered. 4.2.2 The immersion agent of the microstructure of the ferrule shall be 4% nitric acid alcohol solution. 4.3 Crack inspection
For example, cracks of the ferrule can be inspected by magnetic field inspection method or cold pickling method specified in JB1255. In case of disagreement, the hot pickling method specified in Appendix A (Standard Appendix) shall prevail.
4.4 Determination of decarburization
The depth of the decarburized layer on the bearing surface shall be measured according to the determination of (B221). 4.5 Fracture inspection
After high-speed tempering, the ring can be evaluated according to the morphological characteristics of the fracture, or it can be carried out in accordance with the provisions of JBI255. JB/T 8566-1997
Appendix 4
(Appendix to the standard)
Hot pickling inspection procedure
This procedure is applicable to the crack inspection of bearing parts after high-speed tempering. The parts should be sandblasted or degreased before pickling. A1
A2 The pickling solution is 50% hydrochloric acid aqueous solution, the temperature is 60℃±5℃, and the pickling time is 10~30 min. After heat etching, the parts can be neutralized with 4% 6% sodium hydroxide solution at room temperature for about 1m. A3
A4 Observe the surface of the pickled parts with naked eyes. 4
JB/T 8566:1997
Appendix B
(Reminder)
Allowable deformation after quenching and tempering
Allowable deformation after tempering of the ring ratio See Table B1. BI
Nominal outer diameter
Outer diameter allowance
0.30+g.70
0.35+g.c0
0. 45*9.20bzxZ.net
Diameter change maximum
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