HG 2118-1991 Conventional International Rubber Hardness Tester Low Hardness HG2118-1991 Standard Download Decompression Password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Conventional International Rubber Hardness Tester
Subject Content and Scope of Application
Low Hardness
HG2118-91
This standard specifies the technical conditions, inspection rules and marking, packaging, transportation, complete set, etc. of the conventional international rubber hardness tester (low hardness).
This standard is applicable to the conventional international rubber hardness tester (low hardness) used to determine the international hardness value of vulcanized rubber and rubber materials. The test hardness range is 10~35IRHD.
2 Reference Standards
GB9866 Low Hardness (10~35IRHD) Hardness Tester for Vulcanized Rubber 3 Technical requirements
3.1 Basic parameters
Test range: 10~35IRHD
b. Accuracy: 1IRHD
3.2 Working conditions
Ambient temperature: 10~40℃ for normal test, 23±2℃ for standard test; 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 less than 2mm can be placed between the instrument and the work surface c.
3.3 Medical head
The pressure head is replaceable and can be replaced according to the needs of use. The connecting thread of the pressure head is M3. 3.3.1
3.3.2 The pressure head is a sphere, and the spherical surface greater than three-quarters of the way from the top end to the center of the sphere is the working surface, which should meet the following requirements: Pressure head: @5±0.01mm;
Roughness Ra: less than 0.8um;
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. The annular working surface of the pressure foot should meet the following requirements: 3.4.2
8. The verticality of the working surface to the center line of the connecting thread is less than 0.02; surface roughness Ra: less than 1.6μm;
Inner diameter of the annular hole: @1 0±2mm;
d. Outer diameter of annular hole: @22±2mm,
3.5 Indenter penetration depth detection mechanism
The indenter penetration depth detection of the hardness tester can adopt a dial indicator or a displacement sensor and a matching secondary display instrument, but it shall comply with the following provisions approved by the Ministry of Chemical Industry of the People's Republic of China on 1991-08-19 and implemented on 1992-01-01:
HG2118-91
Detection accuracy: not less than 0.014mm per millimeter;a.
b. Measuring range: not less than 6mm;
. When a dial indicator is selected, the dial diameter is greater than @80mm, and the dial is scaled according to the conversion table specified in Appendix A of GB9866. The travel of the dial gauge of the hardness tester is 4mm per revolution; d. When using a displacement sensor, it is best to convert the difference in the indentation depth into the international rubber hardness value for display, and the accuracy should meet 3.5a.
3.6 Force value
The various force values ​​of the hardness tester should meet the relevant provisions of GB9866. 3.7 Guide device
The guide device enables the pressure head and the 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 pressure foot and the base surface should be less than 0.06mm.
3.8 Precision of the spindle systembZxz.net
Through multiple measurements of the base surface, the dispersion of the hardness tester head indication is less than 0.005mm. 3.9 Oscillator
3.9.1 The instrument should produce slight vibration when the oscillator is working; 3.9.2 The insulation resistance of the oscillator circuit to the ground is greater than 7MQ; 3.9.3 The noise pressure level of the oscillator is less than 55dB at a distance of 0.5m from the instrument. 3.10 Transport bump performance
The hardness tester should be able to withstand the temperature changes in nature 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.
3.1F Appearance requirements
&, the paint color is coordinated:
b. There should be no spots 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 overflow shall be controlled at 23±2℃. 4.2 Tools, gauges and instruments used in the test General tools and gauges for relevant tests
Digital indicator calibration table
Tianhu 1000±0.5g
Special force measurement machine
Standard rubber hardness blocks (10~35IRHD3 blocks )Stopwatch (30min±0.5s)
Megaohmmeter (500V)
Sound level meter
Rockwell hardness tester
Surface roughness comparison sample
4.3 Test of meter head
7 pieces;
1 unit;
1 piece;
1 set;
1 piece;
1 piece;
1 piece;
1 unit;
1 set.
Place the hardness tester head on the dial indicator calibration table, take at least 6 test points evenly distributed within the indication range of the hardness tester head, test the standard value and the measured value according to the conversion relationship in Appendix A of GB9866, and the error shall not exceed ±0.014mm. 4.4 Test of the indenter
HG2118-91
a. The Sichuan projector or micrometer selects 8 to 10 axial directions for the working spherical surface of the indenter, and the measurement error shall comply with the provisions of 3.3.2a;
bThe working surface of the E indenter is compared with the surface roughness comparison sample, which shall comply with the provisions of 3.3.2b; The hardness value of the working surface of the indenter is tested with a Rockwell hardness tester, which shall comply with the provisions of 3.3.2c. 4.5 Force value test
4.5.1E foot force value test
Place the hardness tester on the special base for force measurement, remove the indenter first and then tighten the foot. Let the pressure foot fall slowly on the balance pan, and the force value required to make the pressure foot slightly move upward should meet the requirements of 3.6. 4.5.2 Contact force and total force test of indenter
Place the hardness tester on the special force measurement base, first remove the pressure foot and raise the body to expose the indenter. Place a film on the balance pan so that it is directly below the head and weigh the film. Let the indenter fall slowly on the film and continue to add magnetic codes to the magnetic 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 and remove codes to the base code disk, and the needle will rotate to a certain position and will not move. After that, add base codes until the weight of the code when the needle rotates slightly again minus the weight of the film is the total force of the indenter. The contact force and total force of the indenter 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 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 feeler gauge meets the requirements of 3.7. 4.8 Spindle system accuracy test
The base surface of the vertical pressure foot semi-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 when observing the hardness tester head. 4.9.2 Use a 500V megohmmeter to test the insulation resistance, which meets the requirements of 3.9.2. 4.9.3 The distance from the hardness tester is 0 .5m away from the noise level, in accordance with the provisions of 3.9.3. 4.10 Transport bump test
After the qualified packaging of the 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
Inspected by daily measurement method according to the requirements of 3.11.
5 Inspection rules
5.1 Each hardness tester shall be inspected by the quality inspection department and be accompanied by a product certificate before it can leave the factory. The main inspection data shall be recorded in the random documents.
5.2 Test items!
5.2.1 The hardness tester is divided into two categories: factory test and type test. a. Factory test is to be carried out item by item under the conditions of 3.2 of this standard for 3.1, 3.6~3.9 and 3.11; b. Type test is to be carried out item by item under 3.1~3.11 of this standard 5.2.2 Type test is to be carried out for trial production of new products under the following circumstances;
b: When major changes in product design, process and original components may affect product performance: Regular inspection is to be carried out;
HG2118-91
d. When the national quality supervision agency puts forward the type inspection requirements, 5.23 Sampling
Sampling is to be carried out once a year, and no less than two units are to be tested each time. 5.2.4 Judgment rules
. 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 one unit fails in the random inspection, it can be repaired. If it fails again after repair, the product is judged to be unqualified. If two units fail 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, including: a
Model and name of the hardness tester;
bManufacturer name or factory logo;
c. Factory number;
d. Manufacturing date.
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. 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 is fixed with soft plastic and packed into the packaging box. The markings on the outside of the packaging box should be clear and include: 6.2.2
Manufacturer name, hardness tester model and factory number; b.
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 it should be avoided from rain, snow splashing and mechanical collision. 6.4 Completeness||t t||6.4.1 The following documents are provided with the hardness tester
a Packing list;
b Factory certificate;
Instruction manual.
Accessories and tools of the hardness tester.
Additional remarks:
This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry, and this standard is drafted by Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. The drafter of this standard is Hao Ningsun.
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