JB/T 7311-2001 Technical specification for the application of anaerobic adhesive and silicone rubber for construction machinery
Some standard content:
ICS53.100
Machinery Industry Standard of the People's Republic of China
JB/T7311-2001
Construction machinery
Anaerobic adhesive and RTV silicone application Technical specification2001-06-22Released
JB/T7311-2001
China Machinery Industry Federation
2001-10-01Implementation
JB/T 73112001
This standard adopts the US military standard MIL-S-46163A-1983 "One-component anaerobic adhesive for thread locking and sealing" and ISO10123-1990 "Adhesives: Determination of shear strength of anaerobic adhesives by shaft-sleeve" and ISO109641993 "Adhesives: Determination of torsion short strength of anaerobic adhesives on threaded fasteners" and is a revision of JBT7311-1994 "Technical Specifications for Application of Anaerobic Adhesives in Engineering Machinery".
Compared with JB/T7311-1994, the main changes in the technical content of this standard are as follows: 1. This standard was drafted with reference to MIL-S-46163A, ISO10123, ISO10964 and other standards, while the original standard did not refer to these standards.
2. Added technical contents such as the use specification and performance requirements, test methods, and marking examples of silicone rubber. 3. Added the sealing test method of anaerobic flat sealant. 4. All performance indicators of anaerobic adhesives are improved compared with the original standard, and are more complete, reasonable, accurate, and can better meet the use requirements. 5. This standard stipulates the application methods of anaerobic adhesives and silicone rubber in a more specific and detailed manner. Its performance indicators, test methods, and measurement units are consistent with ISO standards and US military standards. 6. Appendix A of this standard "Comparison table of coating codes and anaerobic adhesives and silicone rubber grades" is used in the agreement and technical documents between the supply and demand parties.
Appendix A of this standard is a prompt appendix.
This standard replaces JB/T7311-1994 from the date of implementation. This standard is proposed and managed by the Mechanical Industry Engineering Machinery Standardization Technical Committee. Drafting units of this standard: Tianjin Engineering Machinery Research Institute, Beijing Tianshan New Materials Technology Company. Main drafters of this standard: Wang Cheng, Zhou Defeng, Li Guopeng, Su Xitian. This standard was first issued in July 1994, and this is the first revision. Machinery Industry Standard of the People's Republic of China Machinery Industry Standard of the People's Republic of China Construction Machinery—Anaerobic Adhesive and Silicone Rubber Application—Technical Specification JB/T 73112001 Replaces JB/T7311—1994 This standard specifies the use specifications, basic performance requirements, test methods and marking methods on drawings for anaerobic adhesives and silicone rubber in static sealing parts of construction machinery. This standard applies to the plane sealing of metal parts of construction machinery, the sealing and locking of threaded fasteners, the retention and sealing of shaft and hole parts, and the sealing of pipeline threads. Other mechanical products can refer to it. 2
Cited 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 will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T 41—1986
GB/T 2794—1995
GB/T3103.1—1982
GB/T 5781—1986
GB/T 7307—1987
GB/T13477—1992
Application specification
Surface treatment of parts
Type 1 hexagonal nut
Determination of viscosity of adhesive
Fastener tolerances Bolts, screws and nuts
Full thread
Hexagonal head bolts
Non-thread sealed pipe threads
Test methods for building sealing materials
3.1.1 After removing the paint coating and other residues, the surface of the parts coated with anaerobic adhesive and silicone rubber can be cleaned with any of the following solvents to remove oil, grease, rust inhibitors and other impurities. a) Solvent-based metal cleaning agent;
b) Trichloroethylene, trichloroethane:
c) Acetone.
2 The surface of the parts coated with anaerobic adhesive and silicone rubber should be free of burrs and raised marks caused by sulfur collisions and scratches. 3.1. 2
2 Coating process
3.2.1 Coating of threaded fasteners
Apply an appropriate amount of thread locking glue on the external threads of threaded fasteners. Do not apply glue to the first two threads. Then screw into the internal threads and tighten to the designed torque. If the internal threads are blind holes, apply an appropriate amount of glue at the bottom of the blind holes and then tighten. 2 Coating of flat seal
Approved by China Machinery Industry Federation on June 22, 2001, implemented on October 1, 2001
JB/T7311-2001
Apply a sealing strip of appropriate diameter on any plane of the two joint surfaces to surround the part to be sealed to form a closed rubber ring, and then align and assemble (be careful not to misalign); when the gap is less than 0.5mm, apply anaerobic flat sealant, and the relationship between the diameter of the glue line and the gap and rolling width of the flat seal joint surface should comply with the provisions of Figure 1: when the gap is less than 6mm, apply silicone rubber flat sealant, and the relationship between the diameter of the glue line and the gap and rolling width of the flat seal joint surface should comply with the provisions of Figure 2. 3.2.3 Coating of shaft and hole parts
Apply one or several circles (with a certain gap) of cylindrical parts retaining agent on the mating surface of the shaft, and then install it into the hole. When installing, rotate it slowly so that the entire mating length can be filled with glue. t
Medium glue line diameter mm
0.10 0.15 0.20 0.25
0.30 0.35 0.40 0.45 0.50 0.550.05
0.60 0.65
Seal gap city
Relationship between glue line diameter of anaerobic flat sealant and flat seal gap and rolling width
a-glue line diameter mm
Dense average gap
Figure 2 Relationship between glue line diameter of silicone rubber flat sealant and flat seal gap and rolling width3.2.4 Coating of pipeline threads
Coat pipeline thread sealant on the external threads of pipeline threads. Do not apply glue to the first two threads to avoid entering the pipe mouth, and then tighten. When the pipeline angle needs to be adjusted, it should be done within 20 minutes. 3.2.5 Application of accelerator
When using anaerobic adhesive (thread sealant, anaerobic flat sealant, pipe thread sealant, cylindrical parts retaining agent), if the sealing gap is large, or the ambient temperature during application is below 0°C, or the part material is non-metallic or inert metal (see Table 1), then before applying the adhesive, the accelerator should be sprayed on the surface of any one of the two matching parts, and the anaerobic adhesive should be applied to the other part. After the accelerator evaporates, it should be assembled with the matching part coated with anaerobic adhesive.
Active materials that cure faster
JB/T73112001
Table 1 Parts material classification table
Inert materials that cure slower (accelerator required) Steel, bronze, cast iron, manganese, copper, aluminum alloy, brass, nickel 3.3
Pure aluminum, titanium, passivated surface, stainless steel, rubber, ceramic, zinc, chrome-plated spokes, anodized surface, glass
Surface, plastic,
After the glue is cured, threaded fasteners and pipe threads can be disassembled with general tools: the sealing plane can be knocked or wedged from the side; shaft and hole parts can be disassembled with a press or a tensioner. In special cases, when heated to 250-290C, they can be disassembled with general tools. 3.4
Reassembly of disassembled parts
Clean the residual glue on the surface of the parts, perform surface treatment according to the requirements of 3.1 and coating according to the requirements of 3.2. Basic performance requirements
The performance requirements of threadlockers used for sealing and locking threaded fasteners shall comply with the requirements of Table 2 and Table 3; the tolerances of various threaded fasteners shall comply with GB/T3103.1. Table 2 Performance requirements of thread lockers for removable fasteners Glue
(25℃)
0.01~0.025
Curing time
Mechanical properties after curing
Destructive torque
Average disassembly torque
The sealing and locking agent brands corresponding to the glue codes in the table are shown in Appendix A (suggestive appendix), Table 3
(25℃）
Working temperature
60~+150
The following tables are the same
Performance requirements of thread lockers for non-removable fasteners Curing time
After curing Mechanical properties
Destruction torque
20~-30
Average disassembly torque
Working temperature
60~+150
60-+205
Application range
M2-M12
M6-M24
Below M24
Below M12
Application range
Below M24
Below M36
4.2 The performance requirements of anaerobic adhesive used for plane sealing shall comply with the provisions of Table 4; the performance requirements of silicone rubber used for plane sealing shall comply with the provisions of Table 5. The surface roughness Ra value of the mating surface coated with anaerobic adhesive shall be between 1.6~3.2μm, the flatness shall not be greater than Q10mm, and the effective width shall not be less than 5mm.
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This document was shared by 1509506269. on 2018-12-13Glue coating
Pa·s(25℃)
160-500
270-900
Extrudability
150-400
450-750
250-500
80~250
JB/T7311-200 1
Performance requirements of anaerobic adhesive for plane sealing Curing time
Curing time
Maximum sealing gap
Maximum sealing after curing
Pressure MPa
Performance requirements of silicone rubber for plane sealing Maximum sealing
Elongation
250-350
150-250
250-350
Maximum after curing|| tt||Sealing pressure
Working temperature
60~+210
-60~+150
Working temperaturewww.bzxz.net
80-+210
80-+260
80-+210
Application range
High temperature
Strong vibration
Application range
Glass, ceramics and metal materials
Sealing of materials
Higher temperature
General type
Special for automobiles
Special for electrical equipment
Extrusion data are obtained at 25°C, using a sizing nozzle with a top diameter of 3mm under a pressure of 0.2MPa. Note:
The performance requirements of anaerobic adhesives used for holding and sealing shaft and hole parts shall comply with the provisions of Table 6. The surface roughness R of the shaft part shall have a chamfer of 15°~~30° at the insertion end. The value should preferably be 0.8-1.6um,
Table 6 Performance requirements for anaerobic adhesives used for fixing and sealing shaft and hole parts Glue coating
Pa·s(25'℃C)
100-300
Assimilation time
Filling gap
Optimum range
Shear strength after curing
Working temperature
60-+210
60-+150
Scope of use
Higher temperature
Clear fit
Interference, transition fit
Special for magnetic plug seal
The performance requirements of anaerobic adhesives used for pipe thread sealing shall comply with the provisions of Table 7; the tooth profile, size and tolerance of pipe threads shall comply with the provisions of GB/T7307.
Table 7 Performance requirements of anaerobic adhesive used for pipe thread sealing Glue coating
Pa·s(25℃)
100500
Curing time
Maximum sealing pressure after aging
Working temperature
60+210
60-+150
Scope of application
Oil, water, gas, steam pipelines
Hydraulic and pneumatic pipelines
5 Test method
JB/T73112001
The test method for viscosity of anaerobic adhesive shall be in accordance with the provisions of GB/T2794. 2 The test method for extrusion and elongation of silicone rubber shall be in accordance with the provisions of GB/T13477. 5.2
5.3 Torque test method for anaerobic adhesives used in fasteners 5.3.1 Test pieces
5.3.1.1 The threaded fasteners used in the test shall consist of M10X35 hexagonal bolts (GB/T5781) with full thread and performance grade 88 without surface treatment, and M10 nuts (GB/T41) of the same type. 5.3.1.2 The surfaces of the bolts and nuts shall be thoroughly inspected before the test. There shall be no floating rust, burns, dents, burrs, flash and oxide scale that affect their use. On the threaded surfaces of the bolts and nuts, any scratches that affect their use, incomplete thread buckles, and double cusps on the threaded surfaces of the bolts shall be removed.
5.3.1.3 All bolts or nuts in the same group of tests shall be taken from the same batch; when tightening the test piece combination, the nuts shall be twisted by hand, and any bolts or nuts that are too tight or too loose or stuck due to bruises and burrs shall be removed; and the threads shall not be cleaned with lithium knives, taps or wrenches.
The pitch, pitch diameter and thread type of the bolts used for inspection shall comply with the provisions of GB/T5781. During the arbitration test,
5.3.2 Instruments and Materials
Torque wrench, the measurement accuracy shall not be less than 5%. The load range of the selected torque wrench should generally make the measured load of the test piece between 15%-85% of the torque dial reading.
5.3. 2. 2
The bolts shall be clamped with a vise or other suitable clamp. 5.3.2.3
5.3.2.4
Chemically pure acetone, trichloroethylene or trichloroethane. Chrome plated, absorbent cotton, porcelain basin.
5.3.3 Test conditions
All tightening torque tests shall be conducted at a temperature of (23±2)℃ and a relative humidity of 50%-85%. 5.3.3.1
When the test room cannot meet the standard temperature of (23±2)℃, the test can be conducted at a non-standard temperature and the actual temperature shall be noted in the test report. For arbitration tests, the temperature shall be (23±2)℃. 5.3.4 Test steps
5.3.4.1 Degreasing
a) All steel bolts and nuts shall be immersed in a porcelain basin filled with acetone for washing for 15 minutes and shaken appropriately. Then, a clean basin of acetone shall be replaced for a second cleaning. Trichloroethylene may be used instead of acetone for degreasing. b) Dry the cleaned bolt and nut specimens for 15 minutes. After cleaning, do not touch the bolt thread mating surface with bare hands. 5.3.4.2 Applying anaerobic adhesive
No accelerator shall be applied to all bolt-nut specimens (unless otherwise specified). First, tighten the nut to the bottom of the bolt, apply the anaerobic adhesive continuously on the bolt thread, and repeatedly screw the nut in to ensure that the anaerobic adhesive is evenly distributed on the thread. Then screw the nut out and finally position the nut at a position three pitches away from the end face of the bolt (see Figure 3). Wipe off the excess anaerobic adhesive with absorbent cotton. 5.3.4.3 Curing
The bolt-nut specimens prepared according to 5.3.4.2 shall be placed vertically during the curing period; the bolt-nut parts coated with anaerobic adhesive shall be cured at the specified temperature for 24 hours.
5.3.5 Test
JB/T 7311-2001
Figure 3 Schematic diagram of bolt and nut specimen assembly
Use a torque wrench to test, rotate the torque wrench at a roughly uniform speed, and control the wrench rotation speed to one turn every 5 seconds. Continuously read the relative displacement of the nut at the beginning, and the torque value when it rotates 90°, 180°, 270° and 360°. In addition, add the maximum torque that occurs in this circle, a total of six torque values. See Figure 4.
Nut tool
Bolt tip tool
Schematic diagram of torque test
5.3.6 Test results
5.3.6.1 The torque value of the initial rotation of the nut on the bolt is defined as the breaking torque of the specimen. The average value of the torques at 90°, 180°, 270° and 360° is defined as the average disassembly torque of the specimen. 5.3.6.2
5.3.6.3 The maximum torque value in this circle is defined as the maximum disassembly torque of the specimen. 5.3.6.4 The number of specimens shall not be less than 5, and the arithmetic average value shall be taken and rounded as the test result. 5.4 Test method for static shear strength of anaerobic adhesive 5.4.1 Test piece
5.4.1.1 Each pair of test pieces shall consist of a steel shaft with a diameter of 12h6 without a protective layer and a sliding sleeve with an inner diameter of 12E7. The material shall be 20 steel with a surface roughness Ra of 0.8~1.6um. For specific dimensions, see Figure 5. 2xCl
2 ×CI
Figure 5 Shaft and sleeve
Before the test, check whether the size and roughness of the matching surface of the shaft and sleeve meet the requirements, and select matching components with a clearance range of 5.4. 1.2
0.03-0.06mm. There shall be no rust, burrs or damage on the matching surface of the shaft and sleeve. 5.4.2 Equipment and materials
JB/T7311-2001
5.4.2.1 Universal material testing machine, its load measurement accuracy should not be greater than 5%, and the test load should be between 15% and 85% of the range. Specimen support cylinder: The support cylinder material is 20 steel, and its specific size requirements are shown in Figure 6. 5. 4. 2.2
$25.5 ± 0.1
5 Specimen support cylinder
Micrometer, accuracy is 0.01mm.
5. 4. 2. 3
5.4.2.4 Chemically pure acetone, trichloroethylene or trichloroethane. 5.4.2.5 Chrome-plated sub, absorbent cotton, pond porcelain basin. 5.4.3 Test conditions
5.4.3.1 The compressive shear strength test shall be conducted at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%. 5.4.3.2 When the test room cannot meet the standard temperature of (23 ± 2) °C, the test may be conducted at a non-standard temperature, and the actual temperature shall be noted in the test report. The arbitration test shall be conducted at a temperature of (23 ± 2) °C. 5.4.4 Test steps
5.4.4.1 Cleaning
All test pieces shall be immersed in a porcelain basin filled with acetone for 5 minutes and shaken appropriately. Then, a basin of clean acetone shall be used to clean the test pieces for the second time. After cleaning, the mating surfaces shall not be touched with bare hands. 5.4.4.2 Coating of anaerobic adhesive
No accelerator shall be sprayed on the surface of all test pieces (unless otherwise specified). First, put the sleeve on the shaft, then evenly apply anaerobic adhesive on both sides of the sleeve, and then slowly move and rotate the sleeve on the shaft to evenly distribute the anaerobic adhesive applied on the mating surface of the shaft. Finally, position the sleeve at 9mm from the end of the shaft (see Figure 7). 5.4.4.3 Curing
The test piece prepared according to 5.4.4.2 should be placed vertically and cured at the specified temperature for 24h. a)
Figure 7 Schematic diagram of shaft and sleeve test piece assembly
5.4.5 Determination of static shear strength
Put the cured test piece on the testing machine for determination. Place the sleeve on the hollow supporting cylinder with the central axis aligned with the center of the pressure plate, and one end of the steel shaft close to the upper pressure plate (see Figure 8). Open the refueling valve to push the pressure plate upward at a speed of about 2mm/2min. Apply force on the steel shaft and record the maximum destructive load value when the sleeve moves upward along the steel shaft. Test
Support cylinder
Center line
Figure 8 Simple diagram of compression shear strength test
5.4.6 Test results
Upper east plate
Lower pressure plate
The static shear strength of anaerobic adhesive is calculated according to formula (1). The number of specimens is not less than 5, and the arithmetic mean is taken as the test result. T
Where: T
Static shear strength, MPa:
Inner diameter of the sleeve, mm:
Height of the sleeve, mm:
PThe maximum breaking load value measured by the test in 5.4.5, N. 5.5Test method for sealing of flat sealants
This method is applicable to the determination of the sealing of anaerobic adhesives and silicone rubber flat sealants. Its principle is to use a special liquid pressurizing equipment and test pieces. Use the pressurizing equipment to inject hydraulic oil into the seal to check whether the sealing surface of the test piece leaks after the glue is cured. 5.5.1 Test pieces
5.5.1.1 Each pair of test pieces consists of two flanges. The structural dimensions are shown in Figure 9. Three equal-height pads (evenly distributed) are installed between the flanges. By changing the thickness of the equal-height pads, different adhesive layer thicknesses can be obtained. 1O10019
14 ± 0.2 14 ± 0.2
H Flange: 2-Conformal gasket; 3-Flange: 4Joint: 5-Sealing surface Figure 9 Sealing test specimen
JB/T73112001
5.5.1.2 The flange is made of 45 steel, and the surface roughness Ra of its working surface is 0.80-1.60μm. 5.5.1.3 Before the test, all flange mating surfaces should be degreased, free of residual glue, and free of vinegar contact, and checked for cracks and scratches and whether the flange assembly meets the specified requirements.
5.5.2 Equipment and materials
5.5.2.1 The pressure test equipment is shown in Figure 10, and the pressure is calculated in MPa. The measured load of the specimen should be between 15% and 85% of the pressure gauge reading.
1 Connector: 2- Pressure gauge; 3- Pressurization handle; 4 Pressure adjustment plate Figure 10 Pressure test equipment
2 Chemically pure acetone, trichloroethylene or trichloroethane. 5.5. 2.2
5.5.2.3 Chrome-plated tweezers, absorbent cotton, micrometer. 5.5.3 Test conditions
All pressure tests shall be conducted at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%, and the actual temperature shall be noted in the test report. Arbitration tests shall be conducted at a temperature of (23 ± 2) °C. 5.5.4 Test steps
5.5.4.1 Specimen size measurement
Carefully select flanges and equal height gaskets so that the thickness of the glue layer after assembly is within the required range for testing 5.5.4.2 Degreasing
The flange mating surface shall be repeatedly scrubbed with absorbent cotton dipped in acetone until there is no obvious oil stain on the cotton. Dry the washed flange surface at a temperature of (23 ± 2)°C for 15 minutes. When assembling the degreased test piece by hand, do not touch the mating surface with your hands. 5.5.4.3 Gluing
Select an appropriate rubber strip diameter based on the width of the joint surface and the fitting clearance. Apply the flat sealant evenly on the two mating sealing surfaces of the flange. Add equal-height gaskets and assemble the flanges. When tightening the bolts, tighten them in diagonal order. 5.5.4.4 Curing
The flange test piece after glue coating should be cured at a temperature of (23 ± 2)°C for the specified time in Table 4 and Table 5. 5.5.5 Testing
Install the cured test piece at the interface of the pressure testing machine and apply pressure evenly at a speed of 2~3MPamin until the specified pressure is maintained for 1h. If there is no pressure drop on the pressure gauge, it means that the specified pressure requirement is met. Measure the maximum sealing pressure and continue the pressure test until 93 Test conditions
5.4.3.1 The compressive shear strength test shall be conducted at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%. 5.4.3.2 When the test room cannot meet the standard temperature of (23 ± 2) °C, the test may be conducted at a non-standard temperature, and the actual temperature shall be noted in the test report. The arbitration test shall be conducted at a temperature of (23 ± 2) °C. 5.4.4 Test steps
5.4.4.1 Cleaning
All test pieces shall be immersed in a porcelain basin filled with acetone for 5 minutes and shaken appropriately. Then, a basin of clean acetone shall be used to clean the test pieces for the second time. After cleaning, the mating surfaces shall not be touched with bare hands. 5.4.4.2 Coating of anaerobic adhesive
No accelerator shall be sprayed on the surface of all test pieces (unless otherwise specified). First, put the sleeve on the shaft, then evenly apply anaerobic adhesive on both sides of the sleeve, and then slowly move and rotate the sleeve on the shaft to evenly distribute the anaerobic adhesive applied on the mating surface of the shaft. Finally, position the sleeve at 9mm from the end of the shaft (see Figure 7). 5.4.4.3 Curing
The test piece prepared according to 5.4.4.2 should be placed vertically and cured at the specified temperature for 24h. a)
Figure 7 Schematic diagram of shaft and sleeve test piece assembly
5.4.5 Determination of static shear strength
Put the cured test piece on the testing machine for determination. Place the sleeve on the hollow supporting cylinder with the central axis aligned with the center of the pressure plate, and one end of the steel shaft close to the upper pressure plate (see Figure 8). Open the refueling valve to push the pressure plate upward at a speed of about 2mm/2min. Apply force on the steel shaft and record the maximum destructive load value when the sleeve moves upward along the steel shaft. Test
Support cylinder
Center line
Figure 8 Simple diagram of compression shear strength test
5.4.6 Test results
Upper east plate
Lower pressure plate
The static shear strength of anaerobic adhesive is calculated according to formula (1). The number of specimens is not less than 5, and the arithmetic mean is taken as the test result. T
Where: T
Static shear strength, MPa:
Inner diameter of the sleeve, mm:
Height of the sleeve, mm:
PThe maximum breaking load value measured by the test in 5.4.5, N. 5.5Test method for sealing of flat sealants
This method is applicable to the determination of the sealing of anaerobic adhesives and silicone rubber flat sealants. Its principle is to use a special liquid pressurizing equipment and test pieces. Use the pressurizing equipment to inject hydraulic oil into the seal to check whether the sealing surface of the test piece leaks after the glue is cured. 5.5.1 Test pieces
5.5.1.1 Each pair of test pieces consists of two flanges. The structural dimensions are shown in Figure 9. Three equal-height pads (evenly distributed) are installed between the flanges. By changing the thickness of the equal-height pads, different adhesive layer thicknesses can be obtained. 1O10019
14 ± 0.2 14 ± 0.2
H Flange: 2-Conformal gasket; 3-Flange: 4Joint: 5-Sealing surface Figure 9 Sealing test specimen
JB/T73112001
5.5.1.2 The flange is made of 45 steel, and the surface roughness Ra of its working surface is 0.80-1.60μm. 5.5.1.3 Before the test, all flange mating surfaces should be degreased, free of residual glue, and free of vinegar contact, and checked for cracks and scratches and whether the flange assembly meets the specified requirements.
5.5.2 Equipment and materials
5.5.2.1 The pressure test equipment is shown in Figure 10, and the pressure is calculated in MPa. The measured load of the specimen should be between 15% and 85% of the pressure gauge reading.
1 Connector: 2- Pressure gauge; 3- Pressurization handle; 4 Pressure adjustment plate Figure 10 Pressure test equipment
2 Chemically pure acetone, trichloroethylene or trichloroethane. 5.5. 2.2
5.5.2.3 Chrome-plated tweezers, absorbent cotton, micrometer. 5.5.3 Test conditions
All pressure tests should be carried out at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%, and the actual temperature should be noted in the test report. The arbitration test should be carried out at a temperature of (23 ± 2) °C. 5.5.4 Test steps
5.5.4.1 Specimen size measurement
Carefully select flanges and equal height gaskets so that the thickness of the glue layer after assembly is within the required range for testing 5.5.4.2 Degreasing
The flange mating surface is repeatedly scrubbed with absorbent cotton dipped in acetone until there is no obvious oil stain on the cotton. Dry the washed flange surface at a temperature of (23 ± 2)°C for 15 minutes. When assembling the degreased test piece by hand, do not touch the mating surface with your hands. 5.5.4.3 Gluing
Select an appropriate rubber strip diameter based on the width of the joint surface and the fitting clearance. Apply the flat sealant evenly on the two mating sealing surfaces of the flange. Add equal-height gaskets and assemble the flanges. When tightening the bolts, tighten them in diagonal order. 5.5.4.4 Curing
The flange test piece after glue coating should be cured at a temperature of (23 ± 2)°C for the specified time in Table 4 and Table 5. 5.5.5 Testing
Install the cured test piece at the interface of the pressure testing machine and apply pressure evenly at a speed of 2~3MPamin until the specified pressure is maintained for 1h. If there is no pressure drop on the pressure gauge, it means that the specified pressure requirement is met. Measure the maximum sealing pressure and continue the pressure test until 93 Test conditions
5.4.3.1 The compressive shear strength test shall be conducted at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%. 5.4.3.2 When the test room cannot meet the standard temperature of (23 ± 2) °C, the test may be conducted at a non-standard temperature, and the actual temperature shall be noted in the test report. The arbitration test shall be conducted at a temperature of (23 ± 2) °C. 5.4.4 Test steps
5.4.4.1 Cleaning
All test pieces shall be immersed in a porcelain basin filled with acetone for 5 minutes and shaken appropriately. Then, a basin of clean acetone shall be used to clean the test pieces for the second time. After cleaning, the mating surfaces shall not be touched with bare hands. 5.4.4.2 Coating of anaerobic adhesive
No accelerator shall be sprayed on the surface of all test pieces (unless otherwise specified). First, put the sleeve on the shaft, then evenly apply anaerobic adhesive on both sides of the sleeve, and then slowly move and rotate the sleeve on the shaft to evenly distribute the anaerobic adhesive applied on the mating surface of the shaft. Finally, position the sleeve at 9mm from the end of the shaft (see Figure 7). 5.4.4.3 Curing
The test piece prepared according to 5.4.4.2 should be placed vertically and cured at the specified temperature for 24h. a)
Figure 7 Schematic diagram of shaft and sleeve test piece assembly
5.4.5 Determination of static shear strength
Put the cured test piece on the testing machine for determination. Place the sleeve on the hollow supporting cylinder with the central axis aligned with the center of the pressure plate, and one end of the steel shaft close to the upper pressure plate (see Figure 8). Open the refueling valve to push the pressure plate upward at a speed of about 2mm/2min. Apply force on the steel shaft and record the maximum destructive load value when the sleeve moves upward along the steel shaft. Test
Support cylinder
Center line
Figure 8 Simple diagram of compression shear strength test
5.4.6 Test results
Upper east plate
Lower pressure plate
The static shear strength of anaerobic adhesive is calculated according to formula (1). The number of specimens is not less than 5, and the arithmetic mean is taken as the test result. T
Where: T
Static shear strength, MPa:
Inner diameter of the sleeve, mm:
Height of the sleeve, mm:
PThe maximum breaking load value measured by the test in 5.4.5, N. 5.5Test method for sealing of flat sealants
This method is applicable to the determination of the sealing of anaerobic adhesives and silicone rubber flat sealants. Its principle is to use a special liquid pressurizing equipment and test pieces. Use the pressurizing equipment to inject hydraulic oil into the seal to check whether the sealing surface of the test piece leaks after the glue is cured. 5.5.1 Test pieces
5.5.1.1 Each pair of test pieces consists of two flanges. The structural dimensions are shown in Figure 9. Three equal-height pads (evenly distributed) are installed between the flanges. Different adhesive layer thicknesses can be obtained by changing the thickness of the equal-height pads. 1O10019
14 ± 0.2 14 ± 0.2
H Flange: 2-Conformal gasket; 3-Flange: 4Joint: 5-Sealing surface Figure 9 Sealing test specimen
JB/T73112001
5.5.1.2 The flange is made of 45 steel, and the surface roughness Ra of its working surface is 0.80-1.60μm. 5.5.1.3 Before the test, all flange mating surfaces should be degreased, free of residual glue, and free of vinegar contact, and checked for cracks and scratches and whether the flange assembly meets the specified requirements.
5.5.2 Equipment and materials
5.5.2.1 The pressure test equipment is shown in Figure 10, and the pressure is calculated in MPa. The measured load of the specimen should be between 15% and 85% of the pressure gauge reading.
1 Connector: 2- Pressure gauge; 3- Pressurization handle; 4 Pressure adjustment plate Figure 10 Pressure test equipment
2 Chemically pure acetone, trichloroethylene or trichloroethane. 5.5. 2.2
5.5.2.3 Chrome-plated tweezers, absorbent cotton, micrometer. 5.5.3 Test conditions
All pressure tests shall be conducted at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%, and the actual temperature shall be noted in the test report. Arbitration tests shall be conducted at a temperature of (23 ± 2) °C. 5.5.4 Test steps
5.5.4.1 Specimen size measurement
Carefully select flanges and equal height gaskets so that the thickness of the glue layer after assembly is within the required range for testing 5.5.4.2 Degreasing
The flange mating surface shall be repeatedly scrubbed with absorbent cotton dipped in acetone until there is no obvious oil stain on the cotton. Dry the washed flange surface at a temperature of (23 ± 2)°C for 15 minutes. When assembling the degreased test piece by hand, do not touch the mating surface with your hands. 5.5.4.3 Gluing
Select an appropriate rubber strip diameter based on the width of the joint surface and the fit clearance. Apply the flat sealant evenly on the two mating sealing surfaces of the flange. Add equal-height gaskets and assemble the flanges. When tightening the bolts, tighten them in diagonal order. 5.5.4.4 Curing
The flange test piece after glue coating should be cured at a temperature of (23 ± 2)°C for the specified time in Table 4 and Table 5. 5.5.5 Testing
Install the cured test piece at the interface of the pressure testing machine and apply pressure evenly at a speed of 2~3MPamin until the specified pressure is maintained for 1h. If there is no pressure drop on the pressure gauge, it means that the specified pressure requirement is met. Measure the maximum sealing pressure and continue the pressure test until 91 Pressure test equipment is shown in Figure 10. Calculate the pressure in MPa. The measured load of the test piece should be between 15% and 85% of the pressure gauge reading.
1 Joint: 2- Pressure gauge; 3- Pressure handle; 4 Pressure adjustment plate Figure 10 Pressure test equipment
2 Chemically pure acetone, trichloroethylene or trichloroethane. 5.5. 2.2
5.5.2.3 Chrome-plated tweezers, absorbent cotton, micrometer. 5.5.3 Test conditions
All pressure tests should be carried out at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%, and the actual temperature should be noted in the test report. The arbitration test should be carried out at a temperature of (23 ± 2) °C. 5.5.4 Test steps
5.5.4.1 Specimen size measurement
Carefully select flanges and contour pads so that the thickness of the glue layer after assembly is within the required range for the test. 5.5.4.2 Degreasing
Repeatedly scrub the flange mating surface with absorbent cotton dipped in acrylic until there is no obvious oil stain on the cotton. Dry the washed flange surface at 23±2℃ for 15min. When assembling the degreased specimen by hand, do not touch the mating surface by hand. 5.5.4.3 Gluing
Choose a suitable rubber strip diameter according to the width of the joint surface and the fitting clearance. Apply the flat sealant evenly on the two mating sealing surfaces of the flange. Add contour pads and assemble the flange. When tightening the bolts, tighten them in diagonal order. 5.5.4.4 Curing
The flange specimen after glue coating shall be cured at a temperature of (23±2)℃ for the time specified in Table 4 and Table 5. 5.5.5 Testing
Install the cured specimen at the interface of the pressure testing machine and pressurize it evenly at a speed of 2~3MPamin until the specified pressure is maintained for 1h. If there is no pressure drop on the pressure gauge, it means that the specified pressure requirement is met. Measure the maximum sealing pressure and continue the pressure test until 91 Pressure test equipment is shown in Figure 10. Calculate the pressure in MPa. The measured load of the test piece should be between 15% and 85% of the pressure gauge reading.
1 Joint: 2- Pressure gauge; 3- Pressure handle; 4 Pressure adjustment plate Figure 10 Pressure test equipment
2 Chemically pure acetone, trichloroethylene or trichloroethane. 5.5. 2.2
5.5.2.3 Chrome-plated tweezers, absorbent cotton, micrometer. 5.5.3 Test conditions
All pressure tests should be carried out at a temperature of (23 ± 2) °C and a relative humidity of 50%-60%, and the actual temperature should be noted in the test report. The arbitration test should be carried out at a temperature of (23 ± 2) °C. 5.5.4 Test steps
5.5.4.1 Specimen size measurement
Carefully select flanges and contour pads so that the thickness of the glue layer after assembly is within the required range for the test. 5.5.4.2 Degreasing
Repeatedly scrub the flange mating surface with absorbent cotton dipped in acrylic until there is no obvious oil stain on the cotton. Dry the washed flange surface at a temperature of 23±2)℃ for 15min. When assembling the degreased specimen by hand, do not touch the mating surface by hand. 5.5.4.3 Gluing
Choose a suitable rubber strip diameter according to the width of the joint surface and the fitting clearance. Apply the flat sealant evenly on the two mating sealing surfaces of the flange. Add contour pads and assemble the flange. When tightening the bolts, tighten them in diagonal order. 5.5.4.4 Curing
The flange specimen after glue coating shall be cured at a temperature of (23±2)℃ for the time specified in Table 4 and Table 5. 5.5.5 Testing
Install the cured specimen at the interface of the pressure testing machine and pressurize it evenly at a speed of 2~3MPamin until the specified pressure is maintained for 1h. If there is no pressure drop on the pressure gauge, it means that the specified pressure requirement is met. Measure the maximum sealing pressure and continue the pressure test until 9
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