Chemical Industry Standard of the People's Republic of China
Conventional International Rubber Durometer Medium Hardness
Subject Content and Scope of Application
HG2117-91
This standard specifies the technical conditions, inspection rules and marking, packaging, transportation, and completeness of the conventional international rubber durometer (medium hardness).
This standard is applicable to the conventional international rubber hardness tester (medium hardness) used to determine the international hardness value of vulcanized rubber and rubber-like materials. The test hardness range is 35~85 (30~95) 2 Reference standard
GB6031 Determination of international hardness of vulcanized rubber (30~85IRHD) 3 Technical requirements
3.1 Basic parameters
www.bzxz.neta. Test range: 35~85 (30~95) IRHD b. Accuracy: 1IRHD (standard hardness)
3.2 Working conditions
Conventional test method
a. Ambient temperature: 10~40℃ for normal test and 23±2℃ for standard test; b. Relative humidity: 10%~60%;
No corrosive gas around;
AC voltage: 220V±10%:
The instrument is placed on a horizontal hard work surface, and a rubber sheet with a diameter less than 2mm can be placed between the instrument and the work surface. 3.3 Indenter
3.3.1 The indenter is replaceable and can be replaced according to the needs of use. The connecting thread of the pressure head is M3. 33.2 The pressure head is a sphere, and the spherical surface greater than three-quarters of the top toward the center of the sphere is the working surface, which should comply with the following requirements: Pressure head:
[email protected]±0.01mm;
Roughness Ra: less than 0.8μm
Hardness: not less than HRc50
3.4 Pressure foot
3.4.1 The pressure foot is replaceable and can be replaced according to the needs of use. Its connecting thread is M14×1.5.3.4.2
The annular working surface of the pressure foot should comply with the following requirements : The verticality of the working surface to the center line of the connecting thread is less than 0.02; the surface roughness Ra is less than 1.6um;
Inner diameter of the annular hole: @6±1mm;
Outer diameter of the annular hole: @20±1mm
3.5 Indenter depth detection mechanism
The indenter depth detection of the hardness tester can use a dial indicator or a displacement sensor and a matching secondary display instrument, but it should comply with the following provisions of HG 2117-
approved by the Ministry of Chemical Industry of the People's Republic of China on 1991-08-19 and implemented on 1992-01-01:
a. Detection accuracy: not less than 0.014mm per meter; b. Measuring range: not less than 6mm;
c. When using a dial indicator, the dial diameter is greater than @80mm, and the dial is scaled according to the conversion table specified in Appendix A of GB6031. The travel of the dial indicator head of the hardness tester is 2mm per revolution; d. When using a displacement sensor, it is best to convert the difference in the indentation depth into an international rubber hardness value for display, and the accuracy should comply with 3.5a.
3.6 Force value
The various force values of the hardness tester should comply with the relevant provisions of GB6031. 3.7 Guide device
The guide device enables the pressure head and pressure foot to move relative to each other perpendicular to the base surface. If the base surface is a plane, the maximum gap between the foot and the base surface should be less than 0.06mm.
3.8 Spindle system accuracy
Through multiple measurements of the base surface, the hardness tester head indication is less than 0.005mm. 3.9 Oscillator
3.9.1 The oscillator should produce slight vibration when working: 3.9.2 The insulation resistance of the oscillator circuit to the ground is greater than 7MQ; 3.9.3 The oscillator noise level is less than 55dB at 0.5m away from the instrument. 3.10 Transport bump performance
The hardness tester should be able to withstand the temperature changes in the natural world under packaging conditions, and there should be no damage after the transport bump test. After the transport test, it can still meet the standard requirements without repair and debugging.
3.11 Appearance requirements
a. The paint color is coordinated;
There is no spot or rust on the electroplating.
4 Test method
4.1 Test conditions
The test shall be carried out under the conditions specified in Article 3.2 of this standard, but the temperature shall be controlled at 23±2℃. 4.2 Tools, gauges and instruments used in the test B.
General tools and gauges for related tests;
Digital indicator calibration table
Balance 1000±0.5g
Special force measurement machine
Standard rubber Hardness block (40~95TRHD 6 pieces) Stopwatch (30min±0.5s)
Megaohmmeter (500V)
Sound level meter
Rockwell hardness tester
Surface roughness comparison sample
1 piece;
1 set;
1 piece;
1 piece;
1 set;
1 piece;
1 set;
1 set,
4.3 Test of the indenter
Place the hardness tester on the dial gauge calibration table, and evenly distribute at least 6 test points within the indication range of the hardness tester. Test the standard value and the measured value according to the conversion relationship in Appendix A of GB6031. The error shall not exceed ±0.014mm.4.4. Test of the indenter
HG2117-91
8. Use an energy meter or a micrometer to select the axial 8~ 10 directions, the measurement error shall comply with the provisions of 3.3.2a;
b, the working surface of the positive head is compared with the surface roughness comparison sample, which shall comply with the provisions of 3.3.2b: c, the working surface of the indenter is tested with a Rockwell hardness tester to test its hardness value, which shall comply with the provisions of 3.3.2c, 4.5 Force value test
4.5.1 K foot force value test
Place the hardness tester on the special base for force measurement, first remove the indenter and then tighten the pressure foot. Let the pressure foot slowly fall on the balance pan, and measure the force required to make the pressure foot move slightly upward, which shall comply with the provisions of 3.6. 4.5.2 Contact force and head total force test
Place the hardness tester on the special base for force measurement, first remove the pressure foot and lift the body to expose the indenter. Place a film on the balance pan so that it is directly below the indenter and weigh the film and then measure. Let the pressure head fall slowly on the film and continue to add magnetic codes to the base code disk. When the needle rotates slightly (when the hardness tester vibrates slightly), the weight of the base code minus the weight of the film is the contact force. Continue to add base codes to the base code disk, and the needle will rotate to a certain position and not move. Then add base codes until the needle rotates slightly again. The weight of the base code minus the weight of the film is the total force of the indicator. The contact force and total force of the pressure head should meet the requirements of 3.6. 4.6 Indication test
Use the international rubber hardness standard block within the validity period to test the hardness tester to be tested. The standard hardness indication error should meet the requirements of 3.1b.
4.7 Guide device test
When the pressure foot falls on the flat base surface, the gap measured with a table ruler meets the requirements of 3.7. 4.8 Spindle system accuracy test
The base surface of the base perpendicular to the F foot axis is tested for no less than 5 times, which meets the requirements of 3.8. 4.9 Oscillator
4.9.1 When testing hardness, the pointer of the hardness tester should not jump or rotate. 4.9.2 The insulation resistance test with a 500V megohmmeter shall comply with the provisions of 3.9.2. 4.9.3 The noise test at a distance of 0.5m from the hardness tester shall comply with the provisions of 3.9.3. 4.10 Transport bump test
After the qualified hardness tester is placed on a truck and driven along a Class 3 highway at a speed of 30~40km/h for 200km, it shall be fully inspected according to this standard.
4.11 Appearance test
Inspect by visual inspection according to the requirements of 3.11.
5 Inspection rules
5.1 Each hardness tester must be inspected and qualified by the quality inspection department and accompanied by a product certificate before it can leave the factory. The main inspection data should be recorded in the random documents.
5.2 Test items
5.2.1 Hardness testers are divided into factory tests and type tests. Factory tests are carried out item by item for 3.1, 3.6~3.9 and 3.11 under the conditions of 3.2 of this standard; a.
b. Type tests are carried out item by item for 3.1~3.11 of this standard. 5.2.2 Type tests are carried out in the following cases for trial production of new products;
b. When major changes in the design, process, and original components of the product may affect the product performance; c. Regular inspection;
HG2117-91
d. When the national quality supervision agency proposes type inspection requirements, 5.2.3 Sampling
Sampling once a year, each time no less than two units are subject to type testing, 5.2.4 Judgment rules
8. If there are unqualified items in the factory test instrument, it can be repaired and re-tested. If there are still unqualified items, the product is judged to be unqualified;
b. Type test is carried out on the products that have passed the factory test. If there is one unqualified in the random inspection, it can be repaired once. If it fails again after repair, the product is judged to be unqualified. If two unqualified items are found in the same item, the batch of products is judged to be unqualified. 6 Marking, packaging, transportation and completeness
6.1 Marking
Each hardness tester should have a nameplate, which includes:. Model and name of the hardness tester;
Manufacturer name or factory logo;
c. Factory number:
d. Date of manufacture.
6.2 Packaging
6.2.1 The packaging box should be firm to ensure that it is not damaged during transportation: the space between the packaging box and the hardness tester should be filled with soft materials, and the hardness tester should be firmly fixed in the box: to ensure that it does not move in any direction during transportation. The meter head should be fixed with soft plastic and put into the packaging box. The markings on the outside of the packaging box should be clear, including: 6.2.2
Manufacturer name, hardness tester model and factory number: consignee and address;
Box size and gross weight;
d. "Upward", "precision instrument", "handle with care", etc. 6.3 Transportation
After the product is packaged, it can be transported by common means of transportation, but rain, snow and mechanical collision should be avoided. 6.4 Completeness
6.4.1 Provide the following documents with the hardness tester
set. Packing list;
b. Factory certificate;
Instruction manual.
6.4.2 Accessories and tools with the hardness tester. Additional remarks:
This standard was proposed by China National Chemical Equipment Corporation and is under the jurisdiction of Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. This standard was drafted by Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry, and the drafter of this standard is Wu Ning.
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