JB/T 6370-1992 Test methods for physical and mechanical properties of flexible graphite packing rings

This standard specifies the test equipment, sample requirements, test steps and calculation of test results for testing the density, Shore hardness, compression rate, rebound rate and temperature loss of flexible graphite packing rings. This standard is applicable to the test of the physical and mechanical properties of flexible graphite packing rings. JB/T 6370-1992 Test method for physical and mechanical properties of flexible graphite packing rings JB/T6370-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6370-1992
Physical and Mechanical Properties of Flexible Graphite Packing Rings
Test Methods
Published on July 15, 1992
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1993
Mechanical Industry Standard of the People's Republic of China
Physical and Mechanical Properties of Flexible Graphite Packing Rings
Test Methods
Subject Content and Scope of Application
JB/T6370-1992
This standard specifies the test equipment, sample requirements, test steps and calculation of test results for testing the density, Shore hardness, compression rate, rebound rate and temperature loss of flexible graphite packing rings. This standard applies to the testing of the physical and mechanical properties of flexible graphite packing rings. 2 Reference standards
GB2918
Standard environment for state adjustment and testing of plastic specimens 3 Test of density of flexible graphite packing rings
3.1 Instruments
3.1.1 Balance: sensitivity 0.001g.
3.1.2 Vernier caliper: accuracy 0.02mm. 3.2 Specimens
No less than 5 specimens per group.
3.3 State adjustment
Conduct state adjustment in accordance with GB2918.
3.4 ​​Test steps
Use a vernier caliper to measure the inner and outer diameters of the specimen (measure three points at equal arcs and take the arithmetic mean), accurate to 0.1mm. 3.4.1
3.4.2 Use a vernier caliper to measure the height of the specimen (measure three points at equal distances and take the arithmetic mean), accurate to 0.1mm. 3.4.3 Weigh the mass of the sample to an accuracy of 0.01g. 3.5 Test results and calculations
3.5.1 The density of the sample is calculated according to formula (1): Q
yuan(D2-d)H
Where: e
density of the sample at temperature tc, g/cm2;
mass of the sample, g;
outer diameter of the sample, cm;
d—inner diameter of the sample, cm;
average height of the sample, cm.
3.5.2 The results are expressed as the arithmetic mean of a group of samples, with two significant figures. Approved by the Ministry of Machinery and Electronics Industry on July 15, 1992 (1)
Implemented on January 1, 1993
Testing of Shore hardness of flexible graphite packing ring 4.1 Test equipment
JB/T6370-1992
Type D Shore hardness tester: indication range 10~140HSD, indication accuracy ±2.5HSD 4.2 Test specimen
4.2.1 The absolute value of the difference between the inner and outer diameters of the test specimen shall not be less than 16mm, and the thickness shall not be less than 8mm. 4.2.2 The number of test specimens in each group shall be 3.
4.3 Test steps
4.3.1 Install the hardness tester on the hardness tester bracket and adjust the support screws to make the instrument level. 4.3.2 Place the test specimen on the test platform and test its hardness value. The reading shall be accurate to one decimal place. 4.3.3
Each sample shall be measured at least three points at equal distances on its end face and the arithmetic mean shall be taken. 4.4 Test results
The test results shall be expressed as the arithmetic mean of a group of samples, and the integer shall be taken. 5 Test of compression rate and rebound rate of flexible graphite packing ring 5.1 Test equipment and device
5.1.1 Test equipment
Material testing machine capable of applying load at a uniform speed and load measurement accuracy of ±1%. 5.1.2 Test device
5.1.2.1The test device is shown in the figure below.
Upper diaphragm
Packing ring
Lower diaphragm
5.1.2.2The base of the device is a rectangular parallelepiped of 210mm×200mm×20mm, with a surface quenching hardness of 40~50HRC and a surface roughness of R3.2μm.
5.1.2.3 The diameter of the pressure head is 80mm, the end face quenching hardness is 40~50HRC, the surface roughness is R, 3.2um, the verticality of the upper end face of the pressure rod and the lower end face of the pressure head to the pressure rod axis is level 6, and the parallelism with the upper end face of the base is level 2. 5.1.2.4 The basic deviation between the mold and the specimen is H8, f8. 5.1.2.5
The parallelism of the upper and lower gasket ends of the mold is level 2, and the parallelism of the upper and lower end faces of the pressure sleeve is level 2. 5.1.2.6
Micrometer: accuracy is 0.002mm.
5.1.2.7 Vernier caliper: accuracy is 0.02mm. 5.2 Specimens
Each group of specimens shall not be less than 3 pieces.
5.3 Test steps
JB/T6370—1992
5.3.1 Place the test device steadily in the material testing machine. 5.3.2 Use a vernier caliper to measure the height of the sample (measure three points at equal distances and take the arithmetic mean) as the initial height, accurate to 0.1mm. 5.3.3 Place the mold with the sample between the indenter and the base so that the load is applied uniformly through the axis of the indenter to an initial load of 0.35MPa, maintain for 15s, and record the deformation, then uniformly load to 35MPa within 10s, maintain for 60s, and record the deformation under the final load, then unload to the initial load, maintain for 60s, and record the deformation.
5.4 Test results and calculations
5.4.1 The compression rate and rebound rate are calculated according to formula (2) and formula (3) respectively: C=, -Ar
At2 -At
At2- At,
Where: C—compression rate, %;
Rebound rate, %;
Initial height of the sample, mm;
△t—deformation under initial load, mm;
△t2—deformation under final load, mm;
Deformation after unloading to initial load, mm.
6 Determination method for heat loss of flexible graphite packing ring 6.1 Summary of the method
The dried sample is burned at a specified temperature for 1h, and the ratio of the lost mass to the original mass of the sample is taken as the heat loss of the sample. 6.2 Test equipment
Electric heating constant temperature box.
Muffle furnace.
Balance: Sensitivity 0.001g.
6.3 Samples and their preparation
6.3.1 The outer diameter of the sample is 20~80mm.
6.3.2 Bake the sample in an electric thermostat at 105±5℃ to constant weight, and place it in a dryer to cool for use. 6.3.3
There should be no less than 3 samples in each group.
6.4 Test procedures
6.4.1250℃ heat resistance loss test procedures
6.4.1.1 Keep the crucible in a muffle furnace at 800±10℃ to constant weight, and place it in a dryer to cool for use. 6.4.1.2 Place the constant weight sample in a crucible and weigh it accurately (accurate to 0.001g), then place it together with the crucible in a 3
JB/T6370-1992
muffle furnace at 250±10℃, close the furnace door and burn for 1h, then take it out, cool it for 1~2min, move it into a desiccator and cool it for 30min before weighing it (accurate to 0.001g). 6.4.2450℃ heat loss test steps
Except that the test temperature is changed to 450±10℃, the test steps are the same as those in 6.4.1. 6.4.3600℃ heat loss test steps
Except that the test temperature is changed to 600±10℃, the test steps are the same as those in 6.4.1. 6.5 Test results and calculations
The heat loss W, (%) is calculated according to formula (4): 6.5.1
Heat loss at 1℃, %; Www.bzxZ.net
Where: W
G weight of the sample before ignition, g;
G weight of the sample after ignition, g.
6.5.2 In the test data of a group of samples, if one data is higher or lower than the average value of the other two similar data by 20%, the data shall be invalidated, and the average value of the two similar data shall be taken as the test result, retaining three significant figures. 6.5.3 If the relative errors of the data of the three samples are all greater than 20%, the test shall be invalidated, and another sample shall be taken to repeat the test. 7
Test report
The test report shall include the following contents:
a. Indicate that it is carried out in accordance with this standard;
b. Specification, brand and manufacturer of packing ring; c. Number and serial number of test specimens; d. Test conditions; e. Test machine model; f. Test results; g. Test date and personnel. Additional remarks: This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Hefei General Machinery Research Institute. The main drafters of this standard are Wang Qiang, Wu Suyun and Li Jiang.
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