This standard specifies the main technical requirements for the second-grade tapered roller bearings and their matching spindle parts (shafts and sleeves) for the spindle of jig boring machines. JB/T 2644-2002 Rolling bearings Technical requirements for second-grade tapered roller bearings for the spindle of jig boring machines JB/T2644-2002 Standard download decompression password: www.bzxz.net

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Standard of the Machinery Industry of the People's Republic of China
JB/T2644—2002
JB/T26441991
JB/T2645—199f
Rolling bearings
Technical conditions for tapered roller bearings of tolcrance class 2 for spindles of jigboring machines
Rolling beariugs-Tapered roller bearings of tolcrance class 2 for spindles of jigboring machines-Specifications2002-07-16Published
2002-12-01 Implementation
The State Economic and Trade Commission of the People's Republic of China issues
2 Normative documents
3 Symbols..
4 Technical requirements
5 Measurement methods, inspection and monitoring rules
6 International installation,
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Record A (Informative Appendix) Technical requirements for the main shaft of coordinate boring machine grade 2 circular roller bearings and related parts. TB/T2644-2002
JB/T2644-2002
This standard is a revision of the two standards JB/T2644-1991 "Technical conditions for coordinate boring machine grade B quality identification roller bearings" and JB/T2645-1991 "Technical requirements for the main shaft of coordinate boring machine grade B circular roller bearings and related parts." Compared with B/2644-1991 and JB/2645-1991, the main changes of this standard are as follows: the writing format has been modified in accordance with GB/T1.1-2000: the bearing grade code in the standard has been changed to Grade 2, and the standard name and standard text have been modified accordingly: the inspection requirements for bearings have been added (see 5.3): the "Technical requirements for related parts of Grade 2 circular roller bearings for spindles of coordinate machines" (Appendix A; Appendix A of this standard is an informative appendix). This standard was proposed by the National Machinery Industry Federation. This standard was drafted by the National Technical Committee for Standardization of Bearings (CSBTS/TC93). The drafting unit of this standard is Luoyang Bearing Co., Ltd. The authors of this standard are: Zhao Siling, Zong Buyao. The quality standards replaced by this standard are as follows: JB 2644-1979, JB/T 26441991:—JB2645—1979, JB/T2645—1W1. 1 Scope
JB/T2644—20C2
Rolling bearings Technical conditions for grade 2 tapered roller bearings for spindles of jig boring machines This standard specifies the main technical requirements for grade 2 tapered roller bearings (hereinafter referred to as bearings) for spindles of jig boring machines and their matching parts (shafts and sleeves).
This standard is applicable to grade 2 tapered roller bearings for spindles of jig boring machines and their matching parts and sleeves. 2 Normative references
The clauses in the following documents become the terms of this standard through reference in this standard. For all dated reference documents, all subsequent amendments (excluding dated contents) or The revised editions are not applicable to this standard. However, the parties who have reached an agreement based on this standard should study whether the latest versions of these documents can be used. For any referenced documents without a date, the latest versions are applicable to this standard: (B/T307.2-1995 German dynamic bearings - Source and method for measurement and inspection (negISO/TR9274:1991) GB/T7811-1999 Dynamic bearings - Integer symbol JHT3574-1997 Rolling bearing product marking
JB/T7051-1993 Dynamic bearings - Surface material measurement and evaluation method JBT8921-1999 Rolling bearings and their product parts - Inspection rules - Technical conditions for roller bearings
JB/T 10235—2001
3 Symbols
The numbers given in GBT711-19 apply to this standard. 4 Technical requirements
4.1 Shaft rings and rollers are made of ZGCT15 or 15SiMn steel. When made of ZGCT15, the hardness is 61HRC-65HRC. When made of 7GCTISSiM steel, the hardness is 1HRC--64HRC. 4.2 Defective parts must be stabilized
4.3 The internal finishing and bearing tolerances are in accordance with the provisions of Table 1
Unit: rr.
Upper tolerance
Double-row shafts and products are subject to sample testing
For reference only
Upper tolerance
JB/T 26442002
4.4 The deviation of the outer diameter is as specified in Table 2.
The upper deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m
The lower deviation is as follows: m 4.5
4.6 The surface roughness of the bearing convex and end faces shall be as specified in Table 3, Table 3
Unit um
Nominal upper diameter of shaft and ball
Inner ring inner hole surface
Surface name:
Outer diameter outer cylinder surface
Note: The nominal diameter of the shaft refers to the corresponding inner diameter or outer diameter. The surface roughness of the inner circumference is determined by the inner diameter table: the outer diameter is determined by the outer diameter table, and the difference is determined according to the grade 0 standard in JB/T10235-2001. 4.7
4. For relevant technical requirements, please refer to the provisions of Appendix A. 5. Measurement methods and inspection rules
5.1 The measurement method shall comply with 307.2-[Required] The measurement method shall comply with the requirements of R/T 70511. 5.2
Measurement of the mandrel for inspection of the runout of the mandrel according to the provisions of Table 4
Mandrel displacement diameter
Mandrel taper and distance (1mm)
Mandrel diameter movable
JB/T 2644-2002||tt ||5.4 The inspection items of bearings shall be in accordance with the provisions of Table 1 of JB/T8921-1999, and the AOL values ​​of the main and secondary inspection items shall be 1
6 Marking and packaging
6.1 In addition to the complete marking according to the provisions of B/T3574-197, the bearings shall also be marked on the inner ring and outer end faces respectively to indicate the highest point of the inner and outer diameters, and the symbol is "X": 6.2 The bearings supplied for use shall be rust-proofed and packaged in accordance with the provisions of the bearing manufacturer. After the bearings are rust-proofed and packaged, under normal storage and transportation conditions: the product is guaranteed not to rust within 24 months. The rust-proof period is calculated from the factory. 6.3 High-quality bearings shall be packed separately in reduced-profile foam plastic boxes or other materials with equal protective effects: 3
JB/T2644-2G02
Appendix A
(Informative Appendix
Technical requirements for main and auxiliary grade 2 tapered roller bearing frame and related parts of ball bearings 41 The surface roughness of the shaft and bearing shall be in accordance with the regulations of the manufacturer. Table A.1
Nominal upper diameter of bearings
Unit,
Curved shoulder or special surface
Note: The nominal diameter of the shaft refers to the inner or outer diameter of the corresponding bearing, and the surface roughness is determined by checking the internal changes of the bearing: The surface of the plane and the end face of the bearing shall be checked by the outer diameter of the bearing. The shape and position tolerances of the surface of the bearing and the intermediate surface shall not exceed the provisions of Table A.2. Table A.2
Single: m
Note: The numerical values ​​in the coaxial study refer to the common distance of the two shafts with a relative distance of 300mm. Constant
A3 The shape and position tolerances of the surface of the intermediate surface of the bearing and the intermediate surface shall be in accordance with the provisions of Table A.3: Table 4.3
Note: The numerical values ​​of the coaxiality in the table are the tolerance values ​​when the distance between the two shafts is 3mm, ax
shaft
In: m
unique to the full specification
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