JB/T 8568-1997 This standard is a revision of JB/CQ 118-89 "Technical Requirements for Roller Bearings for Heavy-Duty Conveyor Chains". This standard specifies the structural type, code, external dimensions, technical requirements, measurement methods, inspection rules and packaging of cylindrical roller bearings for conveyor chains (hereinafter referred to as roller bearings). This standard applies to production inspection and subscriber acceptance of finished roller bearings. JB/T 8568-1997 Rolling bearings Cylindrical roller bearings for conveyor chains JB/T8568-1997 Standard download decompression password: www.bzxz.net

JB/T85681997
This standard is a revision of JB/CQ118-89 "Technical Conditions for Roller Bearings for Heavy-Duty Conveyor Chains".
Compared with the original standard, this revision adds the content of the structure type, code and overall dimensions of cylindrical roller bearings for conveyor chains.
Appendix A of this standard is a reminder appendix.
This standard was proposed and managed by the National Technical Committee for Standardization of Rolling Bearings. The drafting units of this standard are: Luoyang Bearing Research Institute of the Ministry of Machinery Industry, Xiantao Bearing). The main drafters of this standard are: Xu Wenbao and Liu Jianzhi. 678
1 Scope
Machinery Industry Standard of the People's Republic of China
Rolling Bearings
Cylindrical Roller Bearings for Conveyor Chains
JB/T8568-.1997
This standard specifies the structural type, code, overall dimensions, technical requirements, measurement methods, inspection rules and packaging of cylindrical roller bearings for conveyor chains (hereinafter referred to as roller bearings). This standard applies to the production inspection and subscriber acceptance of finished roller bearings. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T307.2-1995 Principles and methods for measuring and inspecting rolling bearings GB8597--88 Rolling bearing packaging
JB1255-91 Technical conditions for heat treatment of rolling bearing parts made of high carbon chromium bearing steel JB/T3573--93
Methods for measuring and evaluating the radial clearance of rolling bearings JB/T3574--92 Product marking of rolling bearings JB3/T6641--93 Residual magnetism of rolling bearings and its evaluation method JB/T 7051--93
Methods for measuring and evaluating the surface roughness of rolling bearing parts ZB J11 020--- 89
Inspection rules for rolling bearings and their commodity parts ZB J36 001--86
3 Definition symbols
B: Inner ring nominal width
Carburizing heat treatment quality standard for rolling bearing parts As: Single-inner ring width deviation
B: Total width of inner ring raceway and shoulder (or retaining ring) AB: B, single width deviation
VBi,: Width variation of BI
C: Outer ring nominal width
A: Single-outer ring width deviation
d: Bearing nominal inner diameter
A.: Single-inner diameter deviation
Vam. Average inner diameter variation
di: Nominal diameter of inner ring and chain plate Aai,: Single diameter deviation of d,
Approved by the Ministry of Machinery Industry from 1997 to 04-15
Implementation on 1998-01-01
JB/T 85681997
Vd: Diameter variation in a single radial plane1): Nominal outer diameter of bearing
Number: Single outer diameter deviation
V: Outside diameter variation in a single radial plane
VAverage outer diameter variation
: Nominal outer chamfer size
Maximum one-way size of amix
r: Nominal chamfer size at the mating point between inner ring and chain plateinx: Maximum one-way size of
Ka: Radial runout of outer ring of complete roller bearing 4 Structural type, code and marking
4.1 Structural type
There are two types of rolling bearing structural types specified in this standard: N type
4.2 Code
Seal ring type round roller roller bearing for conveyor chain (see Figure 1); retaining ring type cylindrical roller roller bearing for conveyor chain (see Figure 2). Figure 1 Type N
4.2.1 Code Composition
Figure 2 Type N
The code of roller bearing is composed of the type code N of the roller bearing and the number of millimeters representing the nominal inner diameter of the roller bearing. The change of internal structure, size and material of the roller bearing is indicated by adding a suffix code. The suffix codes and their meanings specified in this standard are as follows: [)·Indicates that the internal structure is changed, chiseled ring type. 1-Indicates that the width dimension of the bearing is changed. If it is changed multiple times, a digital subscript is marked under the code! .2, for example! . 1…/HC
Indicates that the ring and the moving body are made of 20CrMo or other carburized steel. 4.2.2 Code examples
JB/T 8568
N19.2 indicates a cylindrical roller bearing for a sealing ring type conveyor chain with an inner diameter of 19.2mm. N 30.3 D/HC:
indicates a four-way roller bearing for a retaining ring type conveyor chain made of 20crMo or other carburized steel with an inner diameter of 30.3mm.
N 28. 2 I!
4.3 Marking example
5 Overall dimensions
Indicates a sealed ring type conveyor chain limited width roller bearing with an inner diameter of 28.2mm and a width dimension that is different from the basic type N28.2.
Rolling bearing N19.2JB/T8568--1997
Rolling bearing N 28.2［.JB/T 8568-~1997The overall dimensions of roller bearings are recommended to adopt the dimensions in Table A1 of Appendix A (Suggestive Appendix) 6 Technical requirements
6.1 Materials and heat treatment
6.1.1 Materials
The materials of the inner and outer rings, circles, rollers and retaining rings of roller bearings are generally made of GCrI5 steel. However, 2.Ao and other carburizing steels can be used for some special occasions.
6.1.2 Heat treatment
The hardness of the inner ring, outer ring, retaining ring and cylindrical roller after heat treatment should be 52~56HRC and 51~581HR respectively, and the microstructure should be a long body or a corresponding mixed structure. Other heat treatment technical requirements shall be in accordance with the provisions of 5.1.3 in JB1255-91. When 200rMo and other carburizing steels are used, surface carburizing heat treatment is required. The inner ring, outer ring, retaining ring and cylindrical roller have a surface hardness of 54~58HRC and 5660HRC respectively after heat treatment, and the core hardness is 30~40HRC. The effective depth of the surface carburized layer, microstructure and other heat treatment technical requirements shall comply with 2.BJ36001 6.2 Specifications
Bearing tolerances shall be in accordance with the specifications in Table 1 and Table 2.
Table 1 Inner ring
Upper deviation
6.3 Surface roughness
Lower deviation
Upper deviation
Upper deviation
Lower deviation
Lower deviation
The surface roughness of roller bearings shall comply with the requirements in Table 3 and Table 4. Outer ring
Upper deviation
Lower deviation
Lower deviation
Upper deviation
Upper deviation
Lower deviation
Inner hole surface
I3/F85681997
Table 3 Inner ring
Note: For the retaining ring type, the shoulder end face refers to the requirements for the retaining end face, D/mm
6.4 Radial play
The radial clearance of roller bearings shall comply with the provisions of Table 5. Surface
Table Outer ring
Outer diameter surface
d surface
Table 5 Radial clearance
6.5 Appearance quality
The appearance quality of roller bearings shall comply with the provisions of the relevant standards of the manufacturer: 6.6 Residual magnetism
The maximum residual magnetism of roller bearings shall not exceed the provisions of JB/T6641. 6.7 Others
Tainan end beach
Shangyou m
Other surfaces
Other tables
The finished roller bearings shall comply with the product drawings and the provisions of this standard. If the user has special requirements, they can be determined through consultation with the manufacturer. Measurement method
7.1 Tolerance||t t||The tolerance measurement of roller bearings shall be determined according to the measurement principle of GB/T307.2. 7.2 Surface roughness
The measurement of the surface roughness of roller bearings shall be in accordance with the provisions of JB/T7051. 7.3 Clearance
The measurement of the radial clearance of roller bearings shall be in accordance with the provisions of JIB3/T3573. 7.4 Heat treatment quality
When the roller shaft is made of GCr15 steel, the inspection of its quality after heat treatment shall be in accordance with the provisions of JB1255. When the roller bearing is made of 20CrMo or other carburizing steel, the inspection of the carburized layer depth and heat treatment quality shall be in accordance with the provisions of ZB13G001. 7.5 Residual magnetism
The detection of the minimum residual magnetism limit of the roller shall be in accordance with the provisions of JB/TGG41. 682
8 Mark
JB/T 8568..-1997
The marking of roller bearings shall be in accordance with the provisions of JB/T3574. 9 Inspection rules
9.1 The finished roller bearings shall be inspected by the quality management department of the manufacturer, and a quality certificate shall be attached after passing the inspection. 9.2 The sampling and judgment of the finished roller bearings shall be in accordance with ZBJ11.020 Regulations for finished Class A rolling bearings. Inspection level is as per general inspection level II, and inspection items are as per Table 6.
Main inspection items
Inner ring inner diameter deviation and variation A,Vap
Inner ring d, deviation and variation AdsVa
Radial runout of complete roller bearings K.cl
Radial clearance of roller bearings
Secondary inspection items
Inner and outer ring width deviation and variation △B·B, VOuter ring outer diameter deviation and variation Apa, Vn·VSurface roughness
Appearance quality and chamfer
Cleaning, rust prevention, inner and outer packaging and packaging marking of finished roller bearings shall be as per the provisions of GB8597. 683bzxz.net
Roller bearing dimensions are listed in Table A1
Roller auxiliary bearing code
Swivel seal type
N 28. 2 I.1
N30. 21.:
N 38. 3 tt
N 38. 3 I.
N 38.7 L.1
Switch type
N 28. 2 DL,
N 28. 2 DL2
N 30.2 D1.
N 30. 3 DL2
N 38.3 DL.
N38. 3 D1.:
N 38. 7 DI..
N 38. 7 DL.
JB/T 8568
(Appendix to the suggestion)
Roller bearing dimensions
Dimensions
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