JB/T 6639-1993 Technical requirements for skeleton rubber seals for deep groove ball bearings
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T 6639-1993
Technical Requirements for Skeleton Rubber Seals for Deep Groove Ball Bearings
Published on 1993-05-07
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1994-01-01
Mechanical Industry Standard of the People's Republic of China
Technical Requirements for Skeleton Rubber Seals for Deep Groove Ball Bearings
Subject Content and Scope of Application
JB/T 6639-1993
This standard specifies the technical requirements, test methods and inspection rules for the rubber materials, skeletons and finished products of skeleton rubber seals for deep groove ball bearings (hereinafter referred to as seals).
This standard applies to the production inspection and user acceptance of seals for sealed deep groove ball bearings specified in ZBJ11018. 2
Referenced standards
GB1682
GB1683
GB1690
GB1989
GB2828
GB3512
GB5721
GB5722
GB/T2361
ZB JII018
HG4852
Technical requirements
Determination of tensile properties of vulcanized rubber
Test method for Shore A hardness of rubber
Test method for brittle temperature of vulcanized rubber
Determination method for constant deformation compression set of vulcanized rubberTest method for liquid resistance of vulcanized rubber
Determination of wear resistance of vulcanized rubber (using Akron abrasion machine)Count sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches)Test method for hot air aging of rubber
General provisions for marking, packaging and transportation of rubber sealing productsGeneral provisions for storage of rubber sealing products
Wet heat test method for rust-proof grease
Technical conditions for sealed deep groove ball bearings
Test method for rubber-metal tear strength
The physical properties of vulcanized nitrile rubber specimens for sealing rings shall comply with the provisions of Table 1. Table 1
Hardness (Shore A type)
Tear strength (minimum)
Tear elongation (minimum)
Compression set (hot air 100℃×24h, compression rate 20%) Brittle temperature (not higher than)
Approved by the Ministry of Machinery Industry on May 7, 1993
(maximum)
Performance index
Implemented on January 1, 1994
Hot air aging (100℃×72h)
Hardness change (maximum)
Tear strength Change (maximum)
Change in elongation at break (maximum)
Rubber-metal tear strength (minimum)
Liquid resistance test (100℃×24h)
No. 1 standard oil
Volume change
No. 3 standard oil volume change%
Abrasion loss 1" (maximum)
cm/1.61km
JB/T6639-1993
Continued Table 1
Note: 1) This item is not required for seals used in non-contact seal deep groove ball bearings. Performance indicators
The rubber compound used for the seal should be mixed evenly, and no rubber lumps or impurities larger than 0.15mm are allowed. 3.1.1
3.2 The skeleton material for the sealing ring is generally made of 08, 08F or cold-rolled high-quality steel plates with similar performance by stamping. If there are special requirements, they can be agreed upon by both the supply and demand parties.
3.2.1 The structure and dimensional tolerances of the skeleton shall be in accordance with the provisions of the product drawings. 3.2.2
The skeleton material shall be surface treated to improve the anti-corrosion ability. The structural shape and dimensional tolerances of the sealing ring shall be in accordance with the provisions of the product drawings. The shape and position tolerances of the sealing ring shall not exceed the provisions of Table 2 (mainly for mold design and manufacturing). Table 2
The coaxiality of the inner diameter of the sealing ring to the outer diameter
The coaxiality of the outer diameter of the sealing ring skeleton
The flatness of the sealing ring
The outer diameter of the sealing ring
The height and width of the burr on the working lip of the sealing ring shall not exceed 0.05mm, and other defects and impurities are not allowed. The overflow of the parting surface should be trimmed.
Except for the working lip, the appearance quality of other surfaces shall comply with the provisions of Table 3. 3.6
The seal ring shall not be allowed to debond if it is not soaked in acetone for 1 hour. 3.7
3.8The seal ring skeleton shall be free of rust, and the adhesive coating shall be uniform and complete. According to the inspection of Article 4.4 of this standard, its non-rusting time shall exceed 72 hours (3 cycles).
3.9The rubber layer of the seal ring and the grease and anti-rust oil used in the bearing shall match each other. The test shall be carried out according to Appendix B (Supplement) of this standard. After the test, the appearance of the grease and anti-rust oil shall not change abnormally, and the structure, shape and size of the seal ring shall not exceed the provisions of the product drawing. 3.10
The seal ring can be used normally in the range of ambient temperature -30℃~+100℃. According to the storage conditions specified in GB5722, the manufacturer shall ensure that the performance of the finished seal ring shall comply with the provisions of this standard within a storage period of no more than 1 year from the date of leaving the factory. No.
Test method
Defect name
Surface bubble diameter (not more than)
Surface bubble number (not more than)
Surface impurity area (not more than)
Surface impurity number (not more than)
Surface concave height (not higher than)
Surface convex and concave area (not more than)
Surface convex and concave number (not more than)
Rubber surface scratch length (not more than)
Rubber surface scratch depth (not more than)
Scratches on the exposed part of the skeleton
Mold misalignment (not more than)
JB/T 6639-1993
The appearance of the sealing ring and the appearance of the rubber compound shall be inspected by visual inspection or instrument. 80
Outer diameter of sealing ring
Not allowed
Not allowed
The main dimensions (outer diameter, inner diameter, height) and structural shape of the sealing ring are checked with a tool microscope and a projector. 4.2
4.3 The no-bubble test of the sealing ring in acetone shall be checked according to Appendix A (Supplement). >80
The rust test of the sealing ring skeleton shall be carried out according to the provisions of GB/T2361, in which the test piece is directly tested with the sealing ring instead of the sealing ring. The sealing ring sample shall not be processed in any way, but only cleaned. The cleaning method is to use tweezers to pick up the absorbent cotton without solvent gasoline, scrub it 2-3 times for decontamination and degreasing, and it is not allowed to scratch the skeleton and adhesive coating. The rust test results are not graded. As long as one (including one) or more rust spots are observed with the naked eye on the sealing ring skeleton, it is judged as rust.
The dimensional changes of the sealing ring in grease and anti-rust oil shall be checked according to Appendix B. The physical properties of the sealing ring rubber shall be inspected in accordance with the methods specified in the following standards. 4.6.1
Hardness shall be in accordance with GB531.
Tear strength and elongation shall be in accordance with GB528. Compression set shall be in accordance with GB1683. Brittle temperature shall be in accordance with GB1682.
Hot air aging shall be in accordance with GB3512.
Rubber-metal tear strength shall be in accordance with HG4-852. Liquid resistance test shall be in accordance with GB1690.
Abrasion loss shall be in accordance with GB1989.
Inspection rules
JB/T 6639-1993
The sealing ring shall be inspected by the quality inspection department of the manufacturer and accompanied by a certificate of conformity. 5.1
5.2 RubberbzxZ.net
5.2.1 The rubber produced in the same shift and the same machine is a batch. One batch is taken from each batch for basic physical property inspection. 5.2.2 The appearance of the rubber should be inspected roll by roll. 5.2.3 The heat aging and liquid resistance test of the rubber should be sampled once a month, and the brittle temperature and abrasion test should be sampled once a quarter. The tear strength test between the rubber and the metal should be carried out only when the raw materials, process changes and the sealing ring is delaminated. 5.2.4 When the inspection result is unqualified, double samples should be taken for re-inspection of the unqualified items. If the re-inspection is unqualified, the rubber should be allowed to be repaired once. After the repair, a full performance inspection must be carried out. If there is still one unqualified item, the batch of rubber is unqualified and the batch of rubber should be inspected. The inspection of the sampled items should also be handled in the same way. 5.3 The appearance inspection of the sealing ring shall be 100% inspected according to the items specified in Table 3. 4 The main dimensions (outer diameter, inner diameter, height) of the seal drawing and the geometric tolerances specified in Table 2 shall be subject to the provisions of GB2828, and the acceptable quality level AQL is 4 and the special inspection level S-4 shall be sampled for inspection. 5.5 The sampling quantity of 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 dimensional stability test of the sealing ring in grease
and anti-rust oil, etc. shall be as specified in Table 4. Table 4
Below 5000
5001-10000
Above 10000
If there is one unqualified sample in the sampling sample, double the sampling and re-test the unqualified item. If there is still one unqualified sample, the whole batch shall be
unqualified products.
Marking, packaging, storage and transportation
The marking of the sealing ring shall comply with the provisions of the product drawing, and the handwriting shall be clear and complete. 6.2 The packaging, transportation and storage of the sealing ring shall be in accordance with the provisions of GB5721 and GB5722. 6.3 If there are special requirements for the packaging of the sealing ring, it can be agreed upon by the supply and demand parties. 4
JB/T 6639-1993
Appendix A
Test method for immersion of sealing ring in acetone
(Supplement)
This method is to immerse the sealing ring in acetone, observe and record whether the surface of the sealing ring is bubbling, wrinkling or delaminating for a certain period of time, so as to evaluate the degree of adhesion between the rubber and the metal skeleton of the sealing ring. Instruments, materials and reagents
A1.1 Instruments and materials
a. Lathe;
b. Culture blood or sample bottle (slightly larger than the diameter of the sealing ring to be tested): c. Tweezers:
d. 100# sandpaper or emery cloth:
e. Scissors;
f. Narrow sharp knife;
g. Clock:
h. Sealing ring to be tested.
A1.2 Reagents
Acetone analytical grade
A2 Preparation
A2.1 Use scissors to cut off the outer lip of the sealing ring, and then use 100# sandpaper to grind off the uncut rubber to expose the outer circle of the frame, and then use a narrow cutter to cut off the inner lip of the sealing ring to expose the inner circle of the frame. The cutter should be sharp when cutting, and cut along the direction from the glue layer to the frame. Do not cut back and forth with force to avoid damaging the bonding between the glue layer and the frame.
A2.2 After cutting off the inner and outer parts of the sealing ring, place it on a lathe and use a sharp knife to cut off the rubber layer of the sealing ring. The requirements for the cut are as follows: a. The depth of the cut is the thickness of the rubber layer, and only the rubber layer needs to be cut; b. The cut is roughly concentric with the inner and outer circles of the sealing ring (the coaxiality is about 0.3mm); c. If the width of the skeleton ring is less than 4mm, no cut is required; 4~5mm, cut an incision along the center circle of the rubber layer ring surface; if it is greater than 5mm, add an incision for every additional 2.5mm:
d. The distance between the incision and the inner and outer circles shall not be less than 2mm. A2.3 Wash and dry the culture III for later use.
A3 Test steps
A3.1 Place one sealing ring treated as above in each culture dish, with the rubber layer facing up. A3.2 Add acetone to the petri dish with the sealing ring in place until the sealing ring is submerged and 5-10mm higher. Clamp the sealing ring with a plating tool and shake it left and right several times in the acetone solvent to remove bubbles, and record the time. A3.3 Observe and record the surface condition of the sealing ring every 10 minutes, and record the number of sealing rings that are debonded within 1 hour. 5
Debonding judgment
JB/T6639-1993
Debonding is considered to be caused by bubbles exceeding 1mm2 on the surface of the sealing ring. The blistering area on the surface of the sealing ring is less than 1mm2, but the number of bubbles observable by the naked eye is not less than 3, which is also degumming. A4.2
JB/T6639-1993
Appendix B
Test method for dimensional stability of sealing rings in grease or anti-rust oil (supplement)
This method is to determine the dimensional change of nitrile rubber sealing rings after being immersed in grease or anti-rust oil at 100°C for a certain period of time. B1
Instruments, equipment and materials
B1.1Instruments and equipment
a. Reading microscope or tool microscope (division value is not greater than 0.01mm, and the measuring range is within the size range of the seal ring to be tested): b. Electric constant temperature drying oven [adjustable temperature range (50~200) ±1℃]: c. Petri dish or beaker (about 20mm larger than the diameter of the seal ring): d. Narrow scraper (plastic or horn piece about 2~3mm thick, 20mm wide, 200mm long); e. Sample holder (triangular bracket or hanger). B1.2Materials
a, grease or anti-rust oil (grease used for sealed bearings); b. Seal ring to be tested.
B2Preparation
B2.1Put the seal ring at room temperature (25℃) for 2~4h, and after its size stabilizes, use a reading microscope or tool microscope to measure the inner and outer diameters.
B2.2 Use a scraper to apply grease on both sides of the seal ring. The thickness of the grease should not be less than 5mm (be careful to remove bubbles when applying grease). B2.3 Place the seal ring coated with grease in the culture III (if the dimensional change in the anti-rust oil is measured, the seal ring should be placed flat on the triangular bracket in the beaker, and the distance from the bottom of the beaker and the wall of the beaker should be not less than 5mm, and then inject the anti-rust oil to immerse the seal ring 5~10mm high).
B3 Test steps
B3.1 Move the above-mentioned instrument III containing the seal ring sample into the electric constant temperature drying oven. B3.2 Turn on the power supply and start timing when the temperature rises to 100℃C. B3.3 Maintain the temperature at 100±2℃C for 70h, take it out and cool it to room temperature (25℃), scrape off and wipe off the grease, keep it for 2~4h, and after the size is stable, use the same optical measuring instrument mentioned above to measure the inner and outer diameters of the seal ring. B3.4 When measuring the size, attention should be paid to the measurement position before and after immersion in grease. The measurement should be made at the same position as much as possible to avoid the influence of the seal ring precision error on the result.
B3.5 Each seal ring should measure two inner and outer diameter dimensions at the cross vertical position, and read each dimension twice to take the arithmetic mean. B4 Result explanation
B4.1 The size difference before and after immersion in grease or anti-rust oil (taking the arithmetic mean of the sample) is the size change of the seal ring in the grease or anti-rust oil.
The size change measured by this test method includes the shrinkage of the seal ring after treatment at this temperature and the size expansion and contraction of the seal ring caused by grease.
JB/T6639-1993
If only the size change caused by grease to expand and contract the seal ring is measured, the seal ring should be treated at 100℃ first, and the size change in grease should be measured after the size is stable. Additional explanation:
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is drafted by Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Zhou Dulian and Cai Genxi. People's Republic of China
Mechanical Industry Standard
Technical Specifications for Skeleton Rubber Seals for Deep Groove Ball Bearings
JB/T 66391993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Print Sheet 5/8 Number of Words 12.000
First Edition in October 1993
First Printing in October 1993
Print Quantity 1-500
Pricing:
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61_699The sealing ring to be tested.
A1.2 Reagents
Acetone, analytical grade
A2 Preparation
A2.1 Use scissors to cut off the outer lip of the sealing ring, and then use 100# sandpaper to grind off the uncut rubber to expose the outer circle of the frame, and then use a narrow cutter to cut off the inner lip of the sealing ring to expose the inner circle of the frame. The cutter should be sharp when cutting, and cut along the direction from the rubber layer to the frame. Do not cut back and forth with force to avoid damaging the bonding between the rubber layer and the frame.
A2.2 After cutting off the inner and outer parts of the sealing ring, place it on a lathe and use a sharp knife to cut off the rubber layer of the sealing ring. The requirements for the cut are as follows: a. The depth of the cut is the thickness of the rubber layer, and only the rubber layer needs to be cut; b. The cut is roughly concentric with the inner and outer circles of the sealing ring (the coaxiality is about 0.3mm); c. If the width of the skeleton ring is less than 4mm, no cut is required; 4~5mm, cut an incision along the center circle of the rubber layer ring surface; if it is greater than 5mm, add an incision for every additional 2.5mm:
d. The distance between the incision and the inner and outer circles shall not be less than 2mm. A2.3 Wash and dry the culture III for later use.
A3 Test steps
A3.1 Place one sealing ring treated as above in each culture dish, with the rubber layer facing up. A3.2 Add acetone to the petri dish with the sealing ring in place until the sealing ring is submerged and 5-10mm higher. Clamp the sealing ring with a plating tool and shake it left and right several times in the acetone solvent to remove bubbles, and record the time. A3.3 Observe and record the surface condition of the sealing ring every 10 minutes, and record the number of sealing rings that are debonded within 1 hour. 5
Debonding judgment
JB/T6639-1993
Debonding is considered to be caused by bubbles exceeding 1mm2 on the surface of the sealing ring. The blistering area on the surface of the sealing ring is less than 1mm2, but the number of bubbles observable by the naked eye is not less than 3, which is also degumming. A4.2
JB/T6639-1993
Appendix B
Test method for dimensional stability of sealing rings in grease or anti-rust oil (supplement)
This method is to determine the dimensional change of nitrile rubber sealing rings after being immersed in grease or anti-rust oil at 100°C for a certain period of time. B1
Instruments, equipment and materials
B1.1Instruments and equipment
a. Reading microscope or tool microscope (division value is not greater than 0.01mm, and the measuring range is within the size range of the seal ring to be tested): b. Electric constant temperature drying oven [adjustable temperature range (50~200) ±1℃]: c. Petri dish or beaker (about 20mm larger than the diameter of the seal ring): d. Narrow scraper (plastic or horn piece about 2~3mm thick, 20mm wide, 200mm long); e. Sample holder (triangular bracket or hanger). B1.2Materials
a, grease or anti-rust oil (grease used for sealed bearings); b. Seal ring to be tested.
B2Preparation
B2.1Put the seal ring at room temperature (25℃) for 2~4h, and after its size stabilizes, use a reading microscope or tool microscope to measure the inner and outer diameters.
B2.2 Use a scraper to apply grease on both sides of the seal ring. The thickness of the grease should not be less than 5mm (be careful to remove bubbles when applying grease). B2.3 Place the seal ring coated with grease in the culture III (if the dimensional change in the anti-rust oil is measured, the seal ring should be placed flat on the triangular bracket in the beaker, and the distance from the bottom of the beaker and the wall of the beaker should be not less than 5mm, and then the anti-rust oil is injected until the seal ring is immersed 5~10mm high).
B3 Test steps
B3.1 Move the above-mentioned instrument III containing the seal ring sample into the electric constant temperature drying oven. B3.2 Turn on the power supply and start timing when the temperature rises to 100℃C. B3.3 Keep the temperature at 100±2℃C for 70h, take it out and cool it to room temperature (25℃), scrape off and wipe off the grease, keep it for 2~4h, and after the size is stable, use the same optical measuring instrument mentioned above to measure the inner and outer diameters of the seal ring. B3.4 When measuring the size, attention should be paid to the measurement position before and after immersion in grease. The measurement should be made at the same position as much as possible to avoid the influence of the seal ring precision error on the result.
B3.5 Each seal ring should measure two inner and outer diameter dimensions at the cross vertical position, and read each dimension twice to take the arithmetic mean. B4 Result explanation
B4.1 The size difference before and after immersion in grease or anti-rust oil (taking the arithmetic mean of the sample) is the size change of the seal ring in the grease or anti-rust oil.
The size change measured by this test method includes the shrinkage of the seal ring after treatment at this temperature and the size expansion and contraction of the seal ring caused by grease.
JB/T6639-1993
If only the size change caused by grease to expand and contract the seal ring is measured, the seal ring should be treated at 100℃ first, and the size change in grease should be measured after the size is stable. Additional explanation:
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is drafted by Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Zhou Dulian and Cai Genxi. People's Republic of China
Mechanical Industry Standard
Technical Specifications for Skeleton Rubber Seals for Deep Groove Ball Bearings
JB/T 66391993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Print Sheet 5/8 Number of Words 12.000
First Edition in October 1993
First Printing in October 1993
Print Quantity 1-500
Pricing:
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61_699The sealing ring to be tested.
A1.2 Reagents
Acetone, analytical grade
A2 Preparation
A2.1 Use scissors to cut off the outer lip of the sealing ring, and then use 100# sandpaper to grind off the uncut rubber to expose the outer circle of the frame, and then use a narrow cutter to cut off the inner lip of the sealing ring to expose the inner circle of the frame. The cutter should be sharp when cutting, and cut along the direction from the rubber layer to the frame. Do not cut back and forth with force to avoid damaging the bonding between the rubber layer and the frame.
A2.2 After cutting off the inner and outer parts of the sealing ring, place it on a lathe and use a sharp knife to cut off the rubber layer of the sealing ring. The requirements for the cut are as follows: a. The depth of the cut is the thickness of the rubber layer, and only the rubber layer needs to be cut; b. The cut is roughly concentric with the inner and outer circles of the sealing ring (the coaxiality is about 0.3mm); c. If the width of the skeleton ring is less than 4mm, no cut is required; 4~5mm, cut an incision along the center circle of the rubber layer ring surface; if it is greater than 5mm, add an incision for every 2.5mm increase:
d. The distance between the incision and the inner and outer circles shall not be less than 2mm. A2.3 Wash and dry the culture III for later use.
A3 Test steps
A3.1 Place one sealing ring treated as above in each culture dish, with the rubber layer facing up. A3.2 Add acetone to the petri dish with the sealing ring in place until the sealing ring is submerged and 5-10mm higher. Clamp the sealing ring with a plating tool and shake it left and right several times in the acetone solvent to remove bubbles, and record the time. A3.3 Observe and record the surface condition of the sealing ring every 10 minutes, and record the number of sealing rings that are debonded within 1 hour. 5
Debonding judgment
JB/T6639-1993
Debonding is considered to be caused by bubbles exceeding 1mm2 on the surface of the sealing ring. The blistering area on the surface of the sealing ring is less than 1mm2, but the number of bubbles observable by the naked eye is not less than 3, which is also degumming. A4.2
JB/T6639-1993
Appendix B
Test method for dimensional stability of sealing rings in grease or anti-rust oil (supplement)
This method is to determine the dimensional change of nitrile rubber sealing rings after being immersed in grease or anti-rust oil at 100°C for a certain period of time. B1
Instruments, equipment and materials
B1.1Instruments and equipment
a. Reading microscope or tool microscope (division value is not greater than 0.01mm, and the measuring range is within the size range of the seal ring to be tested): b. Electric constant temperature drying oven [adjustable temperature range (50~200) ±1℃]: c. Petri dish or beaker (about 20mm larger than the diameter of the seal ring): d. Narrow scraper (plastic or horn piece about 2~3mm thick, 20mm wide, 200mm long); e. Sample holder (triangular bracket or hanger). B1.2Materials
a, grease or anti-rust oil (grease used for sealed bearings); b. Seal ring to be tested.
B2Preparation
B2.1Put the seal ring at room temperature (25℃) for 2~4h, and after its size stabilizes, use a reading microscope or tool microscope to measure the inner and outer diameters.
B2.2 Use a scraper to apply grease on both sides of the seal ring. The thickness of the grease should not be less than 5mm (be careful to remove bubbles when applying grease). B2.3 Place the seal ring coated with grease in the culture III (if the dimensional change in the anti-rust oil is measured, the seal ring should be placed flat on the triangular bracket in the beaker, and the distance from the bottom of the beaker and the wall of the beaker should be not less than 5mm, and then the anti-rust oil is injected until the seal ring is immersed 5~10mm high).
B3 Test steps
B3.1 Move the above-mentioned instrument III containing the seal ring sample into the electric constant temperature drying oven. B3.2 Turn on the power supply and start timing when the temperature rises to 100℃C. B3.3 Keep the temperature at 100±2℃C for 70h, take it out and cool it to room temperature (25℃), scrape off and wipe off the grease, keep it for 2~4h, and after the size is stable, use the same optical measuring instrument mentioned above to measure the inner and outer diameters of the seal ring. B3.4 When measuring the size, attention should be paid to the measurement position before and after immersion in grease. The measurement should be made at the same position as much as possible to avoid the influence of the seal ring precision error on the result.
B3.5 Each seal ring should measure two inner and outer diameter dimensions at the cross vertical position, and read each dimension twice to take the arithmetic mean. B4 Result explanation
B4.1 The size difference before and after immersion in grease or anti-rust oil (taking the arithmetic mean of the sample) is the size change of the seal ring in the grease or anti-rust oil.
The size change measured by this test method includes the shrinkage of the seal ring after treatment at this temperature and the size expansion and contraction of the seal ring caused by grease.
JB/T6639-1993
If only the size change caused by grease to expand and contract the seal ring is measured, the seal ring should be treated at 100℃ first, and the size change in grease should be measured after the size is stable. Additional explanation:
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is drafted by Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Zhou Dulian and Cai Genxi. People's Republic of China
Mechanical Industry Standard
Technical Specifications for Skeleton Rubber Seals for Deep Groove Ball Bearings
JB/T 66391993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Print Sheet 5/8 Number of Words 12.000
First Edition in October 1993
First Printing in October 1993
Print Quantity 1-500
Pricing:
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61_6992 Use a scraper to apply grease to both sides of the seal ring. The thickness of the grease should not be less than 5mm (be careful to remove bubbles when applying grease). B2.3 Place the seal ring coated with grease in the culture III (if the dimensional change in the anti-rust oil is measured, the seal ring should be placed flat on the triangular bracket in the beaker, and the distance from the bottom of the beaker and the wall of the beaker should be not less than 5mm, and then inject the anti-rust oil to immerse the seal ring 5~10mm high).
B3 Test steps
B3.1 Move the above-mentioned seal ring sample into the electric constant temperature drying oven. B3.2 Turn on the power supply and start timing when the temperature rises to 100℃C. B3.3 Keep the temperature at 100±2℃C for 70h, take it out and cool it to room temperature (25℃), scrape off and wipe off the grease, keep it for 2~4h, and after the size is stable, use the same optical measuring instrument mentioned above to measure the inner and outer diameters of the seal ring. B3.4 When measuring the size, attention should be paid to the measurement position before and after immersion in grease. The measurement should be made at the same position as much as possible to avoid the influence of the seal ring precision error on the result.
B3.5 Each seal ring should measure two inner and outer diameter dimensions at the cross vertical position, and read each dimension twice to take the arithmetic mean. B4 Result explanation
B4.1 The size difference before and after immersion in grease or anti-rust oil (taking the arithmetic mean of the sample) is the size change of the seal ring in the grease or anti-rust oil.
The size change measured by this test method includes the shrinkage of the seal ring after treatment at this temperature and the size expansion and contraction of the seal ring caused by grease.
JB/T6639-1993
If only the size change caused by grease to expand and contract the seal ring is measured, the seal ring should be treated at 100℃ first, and the size change in grease should be measured after the size is stable. Additional explanation:
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is drafted by Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Zhou Dulian and Cai Genxi. People's Republic of China
Mechanical Industry Standard
Technical Specifications for Skeleton Rubber Seals for Deep Groove Ball Bearings
JB/T 66391993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Print Sheet 5/8 Number of Words 12.000
First Edition in October 1993
First Printing in October 1993
Print Quantity 1-500
Pricing:
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61_6992 Use a scraper to apply grease to both sides of the seal ring. The thickness of the grease should not be less than 5mm (be careful to remove bubbles when applying grease). B2.3 Place the seal ring coated with grease in the culture III (if the dimensional change in the anti-rust oil is measured, the seal ring should be placed flat on the triangular bracket in the beaker, and the distance from the bottom of the beaker and the wall of the beaker should be not less than 5mm, and then inject the anti-rust oil to immerse the seal ring 5~10mm high).
B3 Test steps
B3.1 Move the above-mentioned instrument III containing the seal ring sample into the electric constant temperature drying oven. B3.2 Turn on the power supply and start timing when the temperature rises to 100℃C. B3.3 Maintain the temperature at 100±2℃C for 70h, take it out and cool it to room temperature (25℃), scrape off and wipe off the grease, keep it for 2~4h, and after the size is stable, use the same optical measuring instrument mentioned above to measure the inner and outer diameters of the seal ring. B3.4 When measuring the size, attention should be paid to the measurement position before and after immersion in grease. The measurement should be made at the same position as much as possible to avoid the influence of the seal ring precision error on the result.
B3.5 Each seal ring should measure two inner and outer diameter dimensions at the cross vertical position, and read each dimension twice to take the arithmetic mean. B4 Result explanation
B4.1 The size difference before and after immersion in grease or anti-rust oil (taking the arithmetic mean of the sample) is the size change of the seal ring in the grease or anti-rust oil.
The size change measured by this test method includes the shrinkage of the seal ring after treatment at this temperature and the size expansion and contraction of the seal ring caused by grease.
JB/T6639-1993
If only the size change caused by grease to expand and contract the seal ring is measured, the seal ring should be treated at 100℃ first, and the size change in grease should be measured after the size is stable. Additional explanation:
This standard is proposed by the National Technical Committee for Standardization of Rolling Bearings. This standard is drafted by Luoyang Bearing Research Institute of the Ministry of Machinery Industry. The drafters of this standard are Zhou Dulian and Cai Genxi. People's Republic of China
Mechanical Industry Standard
Technical Specifications for Skeleton Rubber Seals for Deep Groove Ball Bearings
JB/T 66391993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×12301/16
Print Sheet 5/8 Number of Words 12.000
First Edition in October 1993
First Printing in October 1993
Print Quantity 1-500
Pricing:
Mechanical Industry Standard Service Network: http://www.JB.ac.cn61_699
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