This standard specifies the technical requirements, inspection and evaluation methods, inspection rules, marking, packaging and transportation of rubber materials, skeletons and finished products for skeleton rubber seals for deep groove ball bearings. This standard applies to vulcanized nitrile rubber seals for sealed deep groove ball bearings specified in JB/T 7752-1995. JB/T 6639-2004 Technical conditions for skeleton nitrile rubber seals for rolling bearing parts JB/T6639-2004 Standard download decompression password: www.bzxz.net

ICS21.100.20
J11
JB
Machinery Industry Standard of the People's Republic of China
JB/T6639—2004
replaces JB/T6639—1993||tt ||Rolling bearing parts
Skeleton acrylonitrile-buta-diene copolymersseal-Specifications
Technical conditions
Rolling bearing parts-Skeleton acrylonitrile-buta-diene copolymersseal-Specifications
2004-02-10 Release
2004-06-01 Implementation
Foreword released by the National Development and Reform Commission of the People's Republic of China
Scope
2
Normative reference documents|| tt||Technical requirements
3
3.1 Rubber for sealing bacteria
Sealing ring skeleton material
3.2
Finished sealing ring
3.3
Inspection and assessment methods
4
4.1
Rubber
4.2
Skeleton
4.3||tt ||Finished product
Inspection regulations delete
5
Rubber
5.1
Finished product,
5.2
Logo, Packaging, and transportation
6
item
Appendix A (normative appendix) sealing ring acetone flooding test method A.1
A.2||tt| |A.3
A.4
A.5
Introduction.
Only equipment, materials and reagents
Preparation work
Test steps
Degumming judgment
Times
Appendix B (normative appendix) Test method for dimensional stability of sealing rings in grease or anti-rust oil, B.1
B.2
B.3
B.4
B .5
Introduction
Instruments, equipment and materials
Preparation
Test steps
Explanation of results
JB/T6639-2004| |tt||Foreword
This standard replaces JB/T6639-1993 "Technical Conditions for Deep Groove Ball Bearing Skeleton Rubber Seals". Compared with JB/T6639-1993, the main changes of this standard are as follows: According to the provisions of GB/T1.1-2000, the format has been adjusted: the content in "Fan Guo" has been modified (the 1993 version and the first chapter of this edition). Chapter); JB/T6639--2004
- has rearranged the referenced standards and modified the standard name according to the latest standards, adding GB/T3522 and deleting GB/T5722 (the 1993 version and this version). Chapter 2): Based on the main line of "rubber, skeleton, and finished product", the original standard has been editorially modified. Among them; the contents of Chapter 3 to Chapter 5 have been completely revised, and Chapter 6 has been partially revised (Chapter 3 to Chapter 6 of the 1993 edition and this edition) - some project names and parameters in Table 1 have been modified : "Compression permanent deformation (compression rate 20%)" is changed to "compression rate 30%" and "rubber and metal tear strength" is changed to "rubber and metal bonding strength" (Table 1 of the 1993 edition and this edition); 1. Appendix A and Appendix B have been modified and some clauses have been added (Appendix A and Appendix B of the 1993 version and this version). 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 Rolling Bearing Standardization Technical Committee (CSBTS/TC98). The drafting organization of this standard is: Luoyang Bearing Research Institute, Wanxiang Group Company. The main drafters of this standard are: Zhang Zijian, Guo Zengjun, Dai Xiaoluo, Wang Zijun, and Zheng Xiaomin. The previous versions of the replaced standard are: JB/T6639-1993
1 range
Rolling bearing parts||JB/T6639-2004
Skeleton type nitrile rubber. Technical Conditions of Sealing Rings This standard specifies the technical requirements for inspection and assessment methods, inspection rules, marking, packaging and transportation of rubber materials, skeletons and finished products for skeleton rubber sealing rings (hereinafter referred to as sealing rings) for deep groove ball bearings. Applicable to vulcanized butadiene rubber (NBR) sealing rings for sealed deep groove ball bearings specified in JB/T7752-1995. 2 Normative reference documents
The provisions in the following documents become the provisions of this standard through reference in this standard. . For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. Version. For undated reference documents, the latest version applies to this standard. GB/T528-1998 Determination of tensile stress and strain properties of vulcanized rubber or thermoplastic rubber (eqv1SO37:1994) GB/T 53I-1999
GB/T1682—1994
GB/T1689—1998
GB/T 1690—1992
GB/T2361—1992
GB/T 2828—1987||tt ||GB/T3512—2001
GB/T3522—1983
GB/T5721—1993
GB/T 7759—1996
815:1991)||tt || Rubber pocket hardness tester indentation hardness test method (idtISO7619:1986) Determination of low-temperature brittleness of vulcanized rubber Single sample method (eqvISO812:1991) Determination of wear resistance of vulcanized rubber (using Aker Abrasion Machine) (neqBS903:PartA9:1988 ) Vulcanized rubber liquid resistance test method (negiSO1817:1985) Anti-rust grease moist heat test method (negJISK2246:1989) Batch-by-batch inspection and counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Vulcanized rubber or thermoplastic rubber hot air accelerates aging and heat resistance Test (eqvISO188:1998) High-quality carbon structural steel cold-rolled steel strip
General provisions for marking, packaging, transportation and storage of rubber sealing products Determination of compressed water deformation of vulcanized rubber and thermoplastic rubber at normal temperature, high temperature and low temperature (eqvISOGB /T 11211—1989
Tensile method for determination of bonding strength between vulcanized rubber and metal (egvTSO814:1986) Technical conditions for sealed deep groove ball bearings
JB/T7752—1995
3 technology Requirements
3.1 The rubber material for the sealing ring
The rubber material for the sealing ring is vulcanized nitrile rubber. The physical performance indicators of the vulcanized nitrile rubber should comply with the table! Provisions. 3.1.1
Table 1
Item
Hardness (Shore A) HRA
Tear strength (min) MPa
Tear elongation Rate (min)%
Compression permanent deformation (max)
Brittle humidity ℃
(Potential air 100℃×24h, compression rate 30%)% Hot air aging (100℃× 72h)
Hardness change (max) HRA
Tear strength change (max)%
Tear elongation change (max)%
Performance indicators|| tt||70±5
10
250
40
≤30
+10
-20
-50
JB/T6639—2004
Liquid resistance test (100℃×24h)
No. 1 standard oil
Volume change
item|| tt||(%)
No. 3 standard oil
Volume change
(%)
Wear reduction＊(max)cm/1.61km||tt| |Adhesion strength between rubber and metal (min) MPa item
Table 1 (continued)
: This item is not required for sealing of non-contact sealed deep groove ball bearings. 3.1.2
The rubber material for the sealing ring should be mixed evenly, and there should be no micelles or impurities larger than 0.15mm. 3.2 Seal ring skeleton material
Performance index
10+5
0~+20
0.5
3
3.2.1. The skeleton material of the sealing ring should generally be made of 08, 08F, 10 or high-quality cold-rolled steel plates with similar properties. Its physical properties should comply with the requirements of GB/T3522-1983. If there are special requirements, they can be agreed upon by both parties. 3.2.2 The structural and dimensional tolerances of the skeleton shall be as specified in the product drawings. 3.2.3 The stamped skeleton parts shall undergo deburring process. 3.2.4 Stamping frame parts should be surface treated to improve corrosion resistance. Finished sealing ring
3.3
3.3.1
3.3.2
3.3.3
3.3.4
Serial number||tt ||1
2
5
6
7
2
The structural shape and dimensional tolerance of the sealing ring are according to the product drawings Regulation. The geometric tolerance of the sealing ring should not exceed the requirements of Table 2. Table 2
mm
item
item
The inner diameter of the sealing figure skeleton is the same as the outer diameter of the sealing figure. Axial Seal Diagram Concentricity of Skeleton Outer Diameter to Seal Outer Diameter Sealing Ring Flatness
≤50
0.04
0.06
0.04
Seal Drawing outer diameter
5085
0.05
0.08
0.05
The glue on the parting surface of the sealing ring should be removed, and the burr height of the working lip should be removed and width should not exceed 0.05mm. The surface appearance quality except the working lip should comply with the provisions of Table 3 Table 3
Defect name
Surface bubble diameter mm
Number of surface bubbles
Surface impurities Area mm2
Number of surface impurities
Surface convex and concave height mm
Surface convex and concave area mm
Number of surface convex and concave
Rubber surface scratch length mm| |tt||Mold misalignment mm
Scratches on the exposed part of the frame
Lack of glue
No more than
No more than
No problem | |tt||No more than
No more than
No more than
No more than
No more than
No more than
≤ 50
2
2
1
2
Outer diameter of sealing ring
mm
50~85|| tt||0.5
3
0.5
3
0.2
-
N
3||tt| |0.05
Not allowed
Not allowed
≥85
0.08
0.10
0.08
≥85|| tt||4
3
3.3.5 The sealing ring should not be degummed if it is not soaked in acetone for 1 hour. JB/T6639—2004
3.3.6 The sealing ring skeleton should be free of rust, the adhesive coating should be uniform and complete, and the rust-free time should exceed 72h (three cycles) according to 4.2.2.
3.3.7 The rubber layer of the sealing ring and the grease and anti-rust oil used in the bearing should match each other. After the test according to 4.3.4, there is no abnormal change in the appearance of the grease and anti-rust oil. The sealing ring The structural shape and size should not exceed the requirements of the product drawings. 3.3.8 The sealing ring should be able to be used normally within the ambient temperature range of -30℃~+100℃. 3.3.9 The manufacturer should ensure that the performance of the finished seal ring shall comply with the requirements in Table 1 during the one-year storage period from the date of shipment. 4 Inspection and evaluation methods
4.1 Rubber material
4.1.1 The tearing strength and elongation shall be inspected according to the methods specified in GB/528. 4.1.2 The compression permanent deformation is checked according to the method specified in GB/7759. 4.1.3 The brittleness temperature is checked according to the method specified in GB/T1682. 4.1.4 Hot air aging shall be inspected according to the methods specified in GB/T3512. 4.1.5 Liquid resistance test shall be checked according to the method specified in GB/T1690, 4.1.6 Wear reduction shall be checked according to the method specified in GB/T1689. 4.2 Skeleton
4.2.1 The sealing ring skeleton shall be inspected by the manufacturer before leaving the factory according to the inspection method specified in GB/T3522. 4.2.2 The corrosion test of the seal ring skeleton shall be carried out in accordance with the regulations in GB/T2361. The sample was directly tested using a sealing ring. The sealing ring sample does not undergo any processing and is only cleaned. The cleaning method is to use a saw to pick up absorbent cotton soaked in solvent gasoline and scrub it two to three times to remove contamination and degreasing. The skeleton and adhesive coating should not be scratched. The corrosion test results are not rated. As long as one or more rust spots (including one) are visually observed on the sealing ring skeleton, it will be judged as rust. 4.3 Finished product
4.3.1 The appearance of the sealing ring shall be inspected by visual inspection or instrument. 4.3.2 The main dimensions (outer diameter, inner diameter, height) and structural shape of the sealing ring are inspected with tool microscopes and projectors as well as special instruments. 4.3.3
The immersion test of the sealing ring in acetone is checked according to Appendix A. 4.3.4 The dimensional stability of the sealing ring in grease and anti-rust oil is checked according to Appendix B. 4.3.5 The hardness of the sealing ring is checked according to the method specified in GB/T531. 4.3.6 The bonding strength between the sealing ring rubber and the metal is checked according to the method specified in GB/T11211. 5 Inspection Rules
5.1 Rubber
5.1.1 The rubber produced in the same class and on the same machine is a batch. Take one batch from each batch to inspect its physical properties. 5.1.2 The appearance of the rubber should be Inspection is carried out roll by roll. 5.1.3 The thermal aging and liquid resistance test of the rubber material shall be randomly inspected once a month, and the brittleness temperature and wear amount shall be randomly inspected once every degree. When the raw materials, processes change and the sealing ring delaminates, the bonding strength test between the rubber and the metal should be carried out. 5.1.4 When failure occurs in 5.1.3, double samples should be taken to re-inspect the unqualified items. If the re-inspection fails, the rubber should be allowed to be re-tested once. After the re-inspection, all performance inspections must be carried out. If there is still one unqualified item, the roller rubber will be deemed to be unqualified. At the same time, the batch of rubber should be sorted one by one. Carry out inspection.
5.2 Finished product
5.2.1 The appearance inspection of the sealing ring shall be 100% inspected according to the items specified in Table 3. 5.2.2 For the inspection of the main dimensions of the sealing ring (outer diameter, inner diameter, height) and the geometric tolerances specified in Table 2, the acceptable quality level AQL is 4 and the special inspection level S-4 is taken for sampling according to the provisions of GB/T2828. examine. 3
JB/T6639—2004
5.2.3 The structural shape of the sealing ring, the immersion test of the sealing ring in acetone, the anti-rust test of the exposed skeleton of the sealing ring, the sealing ring in grease and anti-rust The number of random inspections for dimensional stability tests in rust oil shall be as specified in Table 4. If one of the inspected items in the sampling sample is unqualified, the sampling will be doubled and the unqualified items will be re-inspected. If there is still one unqualified item, the entire batch will be deemed to be unqualified products. Table 4
pieces
batch
≤5000
5001~10000
>10000
number of samples
5
90
10
5.2.4 The sealing ring should be inspected by the quality inspection department of the manufacturer. Products that pass the inspection should be accompanied by a certificate of conformity before leaving the factory. 6 Marking, packaging, and transportation
The marking, packaging, and transportation of the sealing diagram shall be in accordance with the regulations of GB/T5721. 6.1
6.2 If there are special requirements for the packaging of sealing rings, they can be negotiated by both parties. A.1 Introduction
Appendix A
(Normative appendix)
Acetone flooding test method for sealed enclosures
JB/T6639—2004
This method The method is to soak the sealing ring in acetone and observe and record whether the surface of the sealing ring is blistered, wrinkled or delaminated for a certain period of time to evaluate the degree of adhesion between the rubber of the sealing ring and the metal skeleton. A.2 Instruments, materials and reagents
A.2.1 Test equipment, instruments and materials: a) Lathe:
Culture blood or weighing bottle (slightly larger than the diameter of the sealing ring to be measured) ): b)
c)
d)
e)
f)www.bzxz.net
g)
Tweezers: ||tt| |180\ sandpaper or emery cloth;
Scissors:
Pull-type sharp knife:
Clock:
h)
The sealing ring to be tested.
A.2.2 Test reagent:
Acetone (analytical grade).
A.3 Preparation
A.3.1 Use scissors to cut off the sealing ring jacket, and then grind off the uncut rubber on 180\ sandpaper or emery cloth to expose the outer ring of the skeleton.Then use a narrow tool to cut off the inner lip of the sealing ring to expose the inner ring of the skeleton. When cutting, the knife should be sharp and cut along the direction from the adhesive layer to the skeleton. Do not cut hard back and forth to avoid damaging the bond between the adhesive layer and the skeleton.
A.3.2 Place the sealing ring with the inner and outer lips cut off on a lathe and use a sharp knife to cut off the rubber layer of the sealing ring. The incision requirements are as follows: the depth of the incision is the thickness of the rubber layer, and only the rubber layer is cut. Yes; a)
The closed ring formed by the notch should be concentric with the outer ring of the sealing ring, and its coaxiality error should be less than 0.5mm: b)
The ring width of the skeleton is less than 4mm, and no notch is required: 4mm5mm Make a circular cut along the center of the annular surface of the adhesive layer: greater than c)
5mm, add a circular cut for every 2.5mm; d) The distance between the circular cut and the inner or outer ring should not be less than 2mm. A.3.3 Wash the cultured blood and dry it for later use.
A.4 Test steps
A.4.1 Place a piece of the sealing ring after the above treatment in each petri dish, with the glue layer facing up. A.4.2 Add acetone to the culture III in which the sealing ring is placed until the sealing ring is submerged and 5mm to 10mm higher. Use a forge to clamp the sealing ring and shake it left and right in the acetone solvent several times to drive out bubbles and record the time. A.4.3 Observe and record the surface condition of the sealing rings every 10 minutes and record the number of sealing rings that are degummed within 1 hour. 5
JB/T6639-2004
A.5
Degumming identification
A.5.1
A.5.2
A.5.3 || tt | situation, it is judged as qualified.
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