JB/T 7048-2002 Technical requirements for engineering plastic cages of rolling bearing parts
Some standard content:
ICS21.100.20
Machinery Industry Standard of the People's Republic of China
JB/T7048-2002
Replaces JB/T7048-1993
JB/T6638-1993
Rolling bearing parts
Engineering plastic cage
Technical conditions
Rollingbearingparts-plasticcage-specifications2002-07-16Released
2002-12-01Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword
2 Normative references..
3 Terms and definitions, symbols
3.1 Terms and definitions
3.2 Symbols..
Technical requirements,
Inspection methods
Radial tensile strength
Rotational flexibility
Rolling element retention
Surface quality
7 Inspection rules
8 Marking, packaging, transportation and storage,
JB/T7048—2002
Appendix A (Normative Appendix) Rolling bearing parts Technical conditions for PA66-GF25, PA66-GF30, PA66-GFI5 and PA66 for parts cages...6A.1 Scope,
A.2 Technical requirements
A.3 Inspection methods
A.3.1 Preparation of test specimens
A.3.2 Conditioning of test specimens and test environment.A.3.3 Inspection items
A.4 Inspection rules,
A.5 Packaging, marking, transportation and storage
Appendix B (Normative Appendix) Test method for radial tensile strength of cages..B.1 Test equipment and tension fixtures
B.1. 1 Tensile testing machine,
B.1.2 Tensile fixture
B.2 State of cage specimen and test environment B.2.1 Test environment
B.2.2 Test state
B.3 Extraction of cage specimen
Test method
Calculation of radial tensile strength of cage
JB/T7048—2002
This standard replaces JB/T7048-1993 "Technical Conditions for Engineering Plastic Cages of Rolling Bearings" and JB/T6638—1993 "Technical Conditions for Glass Fiber Reinforced Acrylamide 66 for Rolling Bearing Cages". Compared with JB/T7048-1993 and JB/T6638-1993, this standard has the following major changes: The two standards are merged into one standard, the contents of the normative reference documents of the two standards are merged, and the remaining contents of JB/T6638 are included in Appendix A of this standard, and the original Appendix A is changed to Appendix B: According to the provisions of GB/T1.1, the format is adjusted to expand the scope of use of plastic cages (see Chapter 1): The abbreviation code of glass fiber reinforced polyamide 66-25 is modified (see Chapter 1): The symbols He, P, Dw, and L are added, and the content of the term cage radial tensile strength is modified ( See Chapter 3): Added materials (see Chapter 4):
Added 5.1 Common cage structure types, and added 9 cage product drawings (see Chapter 5): In Chapter 5 of the technical requirements, the relevant contents of the technical requirements were modified (see 5.2, 5.3, 5.4): Modified the relevant contents of the inspection method (see 6.1, 6.2, 6.3, 6.5); Modified the relevant contents of the inspection rules (see 7.1, 7.3) Modified Appendix A, Chapter A.4 Inspection rules (see A.4.1 and A.4.2.1): Appendix A and Appendix B of this standard are normative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Paint Dynamic Bearing Standardization Technical Committee (CSBTS/TC98). Drafting units of this standard: Luoyang Bearing Research Institute, Wuxi Luozhu Cage Co., Ltd., BASF (China) Co., Ltd., Jiangdong Nanhuanghai Co., Ltd., Hangzhou Tonghui Haiyi Co., Ltd. The main drafters of this standard are Liu Yaying, Dian Xiaoluo, Wang Zijun, Zhang Zijian, Shi Junqi, Cao Guohua and Gao Lianrong. The previous versions replaced by this standard are: JB/T7048-1993, JB/T6638-1993. 1 Scope
JB/T704B-2002
Rolling bearing parts engineering plastic cage: technical conditions
This standard specifies the materials of rolling bearing engineering plastic cage (hereinafter referred to as cage): glass fiber reinforced polyamide 66 and polyamide 66 (abbreviated as: PA66-GF25, PA66-GF30, PA66-GF15 and PA66) technical requirements, inspection methods and inspection rules This standard applies to the manufacture, inspection and user acceptance of the following types of bearing cages; bearings with dm·n value less than 1.5×10°mm·r/min: bearings with an outer diameter of less than 320mm. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all referenced documents with dates, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For all referenced documents without dates, the latest versions are applicable to this standard. Test method for density and relative density of plastics
GB/T1033
GB/T1034
GB/T1036
GB/T1039
GB/T1040
GB/T1043
GB/T1634
GB/T2547
GB/T3398
GB/T4608
GB/T7141
GB/T8597
GB/T9341
Test method for water absorption of molding materials
Determination method for linear expansion coefficient of plastics
General test method for mechanical properties of plastics
Test method for tensile properties of plastics Test methods
Test methods for impact of simply supported beams on rigid plastics
Test methods for heat deformation temperature (abbreviated as heat deformation temperature) of plastics under bending load Sampling methods for plastic resins
Test methods for indentation hardness of plastics by ball
Test methods for melting point of partially crystalline polymers Optical methods Test methods for hot air exposure of plastics
Rolling bearing packaging
Test methods for bending properties of plastics
GB/T17037.1 Preparation of injection molding test specimens of thermoplastic materials Part 1: General principles and preparation of multi-purpose test specimens and long strip test specimens
Inspection rules for rolling bearings and their commercial parts JB/T8921
3 Terms, definitions and symbols
The following terms, definitions and symbols apply to this standard. 3.1 Terms and Definitions
Radial tensile strength of cage,
Under the specified specimen state, test environment and test speed, a radial tensile load is applied to the cage until the tensile load value at which the cage breaks is divided by the value of the minimum axial cross-sectional area of the cage. 3.2 Symbols (see Figures 1 to 11)
D: Nominal outer diameter of cage
Dsp: Center circle diameter of cage pocket:
d: Nominal inner diameter of cage:
B: Nominal width of cage:
d4: Diameter of cage ball pocket or window hole: JB/T7048—2002
H: Distance from cage bottom to ball hole center J: Locking diameter of cage pocket:
Z, Number of cage pockets or balance holes:
C: Distance between centers of two adjacent cage pockets or window holes L: Width of cage window hole:
P: Center distance of cage ball of double-row self-aligning ball bearing: Dw: Nominal diameter of rolling element;
Lw: Nominal length of rolling element.
4 Materials
The cage materials are PA66-GF25, PA66-GF30, PA66-GF15 and PA66, and their performance indicators shall comply with the provisions of Appendix A. When processing cages, recycled materials are not allowed. If other materials are used, the technical conditions can be negotiated and determined with the user. 5 Technical requirements
5.1 Common cage structure types are shown in Figures 1 to 11.
JB/T 7048-2002
JB/T7048—2002
5.2 The cage dimensions and tolerances shall comply with the requirements of the product drawings. 11
5.3 In order to ensure the flexibility of the cage, the finished cage after injection molding should be subjected to humidity conditioning treatment (when assembling the bearing, the cage is not allowed to be brittle). If there are special requirements for the finished cage, other stabilization treatment methods can be used. 5.4 Other technical requirements for the cage should comply with the provisions of Table 1. Table 1
Inspection method
Radial tensile strength;
Rotation flexibility
Rolling element retention
Surface quality
Radial tensile strength
Technical requirements
a) ≥65MPa (PA66-GF25, PA66-GF30, PA66-GF15 cage) b) ≥40MPa (PA66 cage)
The rolling element should rotate freely in the cage hole or window hole. After the bearing is installed, the bearing should rotate freely without any Hysteresis phenomenon
When the rolling element is installed in the cage pocket or window hole, it should be locked automatically according to the position required by the product drawing and shall not be separated from the cage
) The surface of the cage should be neat and smooth, and no defects such as lack of material, overflow, burr, crack, streak, concave decay, peeling, delamination, warping and obvious welding marks are allowed. b) The surface of the cage pocket or window hole should be bright, and no bubbles or impurities are allowed inside. c) The color of the cage should be uniform, and no oil, scale, dust, etc. are allowed on the surface of the cage according to the provisions of Appendix B. For cages with special shapes, appropriate test methods can be negotiated with the user. 6.2 Rotational flexibility
When the standard rolling element that meets the product drawing is installed in the cage pocket or window hole, it shall not be stuck. Install it into the qualified inner and outer rings and rotate it by hand. The bearing should rotate flexibly without hysteresis. The cage should not contact the inner and outer rings (except for the cage guided by the ring rib). 6.3 Rolling body retention
Use standard rolling bodies that meet the product drawing to install in the cage pocket or window hole. According to the orientation required by the product drawing, the rolling body and the cage should not be separated.
6.4 Surface quality
Visual inspection.
6.5 Dimensions
6.5.1 The cage pocket diameter and window hole diameter de should be installed with standard rolling bodies that meet the product drawing. The rolling bodies are not allowed to get stuck or fall out. JB/T7048-—2002
6.5.2 The cage hole lock diameter J, nominal inner diameter d, nominal outer diameter Ds, and nominal width B. should be measured with a vernier caliper with an accuracy of 0.02mm or a gauge of equivalent accuracy.
7 Inspection rules
7.1 The finished cage should be inspected by the quality inspection department of the cage manufacturer. 7.2 The surface quality of the finished cage should be inspected 100%. 7.3 The cage should be accepted according to JB/T8921. The acceptable quality level AQL of the main items (radial tensile strength, rotational flexibility, rolling element retention) is 2.5: The AQL of the secondary items (other items and dimensions) is 4.0: The sample size is drawn according to the special inspection level S-3, and the acceptance and rejection judgment numbers Ac and Re are used for judgment. 8 Marking, packaging, transportation and storage
8.1 The cages that have passed the final inspection should be rolled with wrapping paper or packed in plastic bags, and then packed in cartons or wooden boxes. The outer packaging should comply with the provisions of GB/T8597.
8.2 The cage packaging box should be accompanied by the manufacturer's product certificate. The product model, production date and quantity should be indicated on the certificate. The manufacturer, product model and quantity should be marked on the outside of the packaging box. 8.3 The cage should be protected from moisture, water and extrusion during transportation. 8.4 The cage should be stored in a dry, ventilated warehouse that is not exposed to direct sunlight, and should not come into contact with acids or alkalis and should be kept away from heat sources. JB/T7048
8-2002
Appendix A
(Normative Appendix)
Technical conditions for PA66-GF25, PA66-GF30, PA66-GF15, and PA66 for rolling bearing parts cages
This appendix specifies the technical requirements, inspection methods, and testing rules for PA66-GF25, PA66-GF30, PA66-GF15, and PA66. This appendix applies to the production inspection and user inspection of PA66-GF25, PA66-GF30, PA66-GF15 and PA66 for rolling bearing cages. Technical requirements
PA66-GF25, PA66-GF30, PA66-GF15 and PA66. Technical requirements are as specified in Table A.1.
Density g/em
Water absorption
Molding shrinkage
Tensile strength
Impact strength
Notched impact strength kJ/m
Ball indentation hardness
Flexural modulus
Heat deformation humidity (1.8MPa)
Linear expansion coefficient 10-/c
Use humidity range
a) Tensile strength
b) Impact strengthwww.bzxz.net
e) Notched impact strength
PA66-GF25
≥200
≥240
40~120
PA66-GP30
PA66-GF15
Fine granular, no obvious color difference, no burnt particles
≥210
≥240
-40~120
≥110
≥170
≥240
-40110
Note: The glass fiber contents of PA66-GF25, PA66-GF30 and PA66-GF15 are 25%, 30% and 15% respectively. Inspection method
Preparation of specimens
The specimens required for the test items shall be prepared in accordance with the provisions of GB/T17037.1, and the specimen state adjustment and test environment
≥130
The tensile strength, impact strength, notched impact strength and flexural elastic modulus after room temperature and heat aging tests shall be adjusted and tested in accordance with the provisions of GB/T1039
The specimens shall be tested in a dry state. The dry state refers to the state in which the specimens are placed in a dryer for more than 24 hours immediately after injection molding or heat aging test.1 The cages that have passed the final inspection shall be packed in rolls of wrapping paper or in plastic bags, and then packed in cartons or wooden boxes. The outer packaging shall comply with the provisions of GB/T8597.
8.2 The cage packaging box shall be accompanied by the manufacturer's product certificate. The product model, production date and quantity shall be indicated on the certificate. The manufacturer, product model and quantity shall be marked on the outside of the packaging box. 8.3 The cages shall be protected from moisture, water and extrusion during transportation. 8.4 The cages shall be stored in a dry, ventilated warehouse that is not exposed to direct sunlight, shall not come into contact with acids and alkalis and shall be away from heat sources. JB/T7048
8-2002
Appendix A
(Normative Appendix)
Technical conditions for PA66-GF25, PA66-GF30, PA66-GF15 and PA66 for rolling bearing parts cages
This appendix specifies the technical requirements, inspection methods and testing rules for PA66-GF25, PA66-GF30, PA66-GF15 and PA66. This appendix applies to the production inspection and user inspection of PA66-GF25, PA66-GF30, PA66-GF15 and PA66 for rolling bearing cages. Technical requirements
PA66-GF25, PA66-GF30, PA66-GF15 and PA66. Technical requirements are as specified in Table A.1.
Density g/em
Water absorption
Molding shrinkage
Tensile strength
Impact strength
Notched impact strength kJ/m
Ball indentation hardness
Flexural modulus
Heat deformation humidity (1.8MPa)
Linear expansion coefficient 10-/c
Use humidity range
a) Tensile strength
b) Impact strength
e) Notched impact strength
PA66-GF25
≥200
≥240
40~120
PA66-GP30
PA66-GF15
Fine granular, no obvious color difference, no burnt particles
≥210
≥240
-40~120
≥110
≥170
≥240
-40110
Note: The glass fiber contents of PA66-GF25, PA66-GF30 and PA66-GF15 are 25%, 30% and 15% respectively. Inspection method
Preparation of specimens
The specimens required for the test items shall be prepared in accordance with the provisions of GB/T17037.1, and the specimen state adjustment and test environment
≥130
The tensile strength, impact strength, notched impact strength and flexural elastic modulus after room temperature and heat aging tests shall be adjusted and tested in accordance with the provisions of GB/T1039
The specimens shall be tested in a dry state. The dry state refers to the state in which the specimens are placed in a dryer for more than 24 hours immediately after injection molding or heat aging test.1 The cages that have passed the final inspection shall be packed in rolls of wrapping paper or in plastic bags, and then packed in cartons or wooden boxes. The outer packaging shall comply with the provisions of GB/T8597.
8.2 The cage packaging box shall be accompanied by the manufacturer's product certificate. The product model, production date and quantity shall be indicated on the certificate. The manufacturer, product model and quantity shall be marked on the outside of the packaging box. 8.3 The cages shall be protected from moisture, water and extrusion during transportation. 8.4 The cages shall be stored in a dry, ventilated warehouse that is not exposed to direct sunlight, shall not come into contact with acids and alkalis and shall be away from heat sources. JB/T7048
8-2002
Appendix A
(Normative Appendix)
Technical conditions for PA66-GF25, PA66-GF30, PA66-GF15 and PA66 for rolling bearing parts cages
This appendix specifies the technical requirements, inspection methods and testing rules for PA66-GF25, PA66-GF30, PA66-GF15 and PA66. This appendix applies to the production inspection and user inspection of PA66-GF25, PA66-GF30, PA66-GF15 and PA66 for rolling bearing cages. Technical requirements
PA66-GF25, PA66-GF30, PA66-GF15 and PA66. Technical requirements are as specified in Table A.1.
Density g/em
Water absorption
Molding shrinkage
Tensile strength
Impact strength
Notched impact strength kJ/m
Ball indentation hardness
Flexural modulus
Heat deformation humidity (1.8MPa)
Linear expansion coefficient 10-/c
Use humidity range
a) Tensile strength
b) Impact strength
e) Notched impact strength
PA66-GF25
≥200
≥240
40~120
PA66-GP30
PA66-GF15
Fine granular, no obvious color difference, no burnt particles
≥210
≥240
-40~120
≥110
≥170
≥240
-40110
Note: The glass fiber contents of PA66-GF25, PA66-GF30 and PA66-GF15 are 25%, 30% and 15% respectively. Inspection method
Preparation of specimens
The specimens required for the test items shall be prepared in accordance with the provisions of GB/T17037.1, and the specimen state adjustment and test environment
≥130
The tensile strength, impact strength, notched impact strength and flexural elastic modulus after room temperature and heat aging tests shall be adjusted and tested in accordance with the provisions of GB/T1039
The specimens shall be tested in a dry state. The dry state refers to the state in which the specimens are placed in a dryer for more than 24 hours immediately after injection molding or heat aging test.
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