This standard specifies the technical requirements, measurement methods and inspection rules for blower bearings used in power stations. JB/T 7753-1995 Blower bearings JB/T7753-1995 Standard download decompression password: www.bzxz.net

JB/T 7753---1995
This standard is formulated for the first time.
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard was drafted by the Yang Bearing Research Institute of the Machinery Industry Bureau. The main drafters of this standard are Guo Baoxia and Fang Shenquan. 628
1 Scope
Mechanical Industry Standards of the People's Republic of China
Blower Bearings
JB/T 7753.:1995
This standard specifies the technical requirements, measurement methods and inspection rules for blower bearings for power stations (hereinafter referred to as bearings). This standard applies to blower bearings for power stations. It is also applicable to blower bearings for metallurgy, mining and other industries, and is provided for production, inspection and acceptance by manufacturers.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When the standard is published, the versions shown are all valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest version of the following standards: GB/T307.1··94 Rolling bearing radial bearing tolerance GH307.2~81 Rolling bearing tolerance measurement method GB307.3-81 Rolling bearing
···General technical requirements
GB30889 Rolling bearing steel ball
(B3203---82 Carburizing bearing steel technical conditions GB/T4604·93 Rolling bearing radial clearance GB4661-·89 Rolling bearing cylindrical roller
JB 125591
High carbon chromium bearing steel rolling bearing parts heat treatment technical conditions JB/T 3573---93
J13/T 7051: 93
ZB J11 020.---89
ZB J11 023Www.bzxZ.net
Measurement and evaluation method of radial clearance of rolling bearingsMethod of measurement and evaluation of surface roughness of rolling bearing partsInspection rules for rolling bearings and parts of productsTechnical conditions for J6915 contact angle measuring instrument for angular contact ball bearingsZ13 J36 001 - 86
Quality standard for carburizing heat treatment of rolling bearing partsYB 9.68
Technical conditions for chromium bearing steel
3 Technical requirements
3.1 Materials and heat treatment of bearing parts
3.1.1 Inner and outer rings and rolling elements of bearings shall be made of vacuum degassed GCr15. (Cr15SiMn bearing steel or carburized bearing steel. The steel materials shall comply with the provisions of YB9, GB3203 and the competent authorities respectively3.1.2 Rings and rolling elements made of GCr15 bearing steel Use martensitic quenching or bainitic quenching. Heat treatment quality shall comply with the provisions of .131255.
3.1.3 Bearing rings made of martensitic quenching GCr15 and GCr15SiMn bearing steel and rollers with a diameter greater than 15mm and steel balls with a diameter greater than 25mm shall be tempered at 250C, and the hardness value shall be 58-62HRc. 3.1.4 When carburizing bearing steel is used to make rings: Heat treatment quality shall comply with ZBJ 36001 regulations: 3.1.5 100% of the bearing rings should be supplemented with fire to eliminate grinding stress. 3.2 Tolerance
Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on July 1, 1996
JB/T7753-1995
The tolerance grade of the bearing should not be lower than the 6th grade tolerance specified in G13/T307.1. 3.3 Clearance, contact angle ||tt ||3.3.1 The radial clearance of roller bearings shall comply with the provisions of Group 3 in GB/I4604. 3.3.2 The contact angle of angular contact ball bearings shall comply with the provisions of the drawings. 3.4 Appearance
Bearing rings and rolling elements are not allowed to have cracks. 3.5 Others
3.5.1 The matching requirements of angular contact ball bearings shall comply with the provisions of the competent department of the manufacturer. 3.5.2 Requirements not specified in this standard shall comply with the provisions of GB307.3. 4 Measurement methods
4.1 The measurement of dimensional tolerance and rotation accuracy of bearings shall comply with the provisions of GB307.2. 4.2 The measurement of contact angle of angular contact ball bearings shall comply with the provisions of ZB11023. 4.3 The inspection method of heat treatment quality shall comply with the provisions of JB1255. 4.4 The measurement of surface roughness shall comply with the provisions of JB/T7051. 4.5 The measurement method of radial clearance shall comply with the provisions of JB/T3573 5 Inspection rules
5.1 The bearing rings and rolling elements shall be 100% inspected for cracks in accordance with the provisions of JB1255. 5.2 Inspection rules and inspection items shall comply with the provisions of finished bearings in ZBJ11020. The AQL value of the main inspection items of Class A is 1.5, and the AQI. of the secondary inspection items of Class A is 4.0.
6 Test
The first batch of bearings produced shall be tested for operation under simulated host speed and load conditions, and no abnormalities shall be found after 48 hours. The test samples shall be no less than 2 sets. 7 Marking, rust prevention and packaging
7.1 The inner ring (or outer ring) and outer ring assembly (or inner ring assembly) of separable cylindrical roller bearings shall be packaged separately. 7.2 The marking content and method, rust prevention and packaging of bearings shall comply with the provisions of GB307.3. 630
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