HG 2369-1992 Technical Specifications for Rubber and Plastic Tensile Testing Machines
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG 2369 —92
Rubber and Plastic Tensile Testing Machine
Technical Conditions
1992-09-15 Issued
Ministry of Chemical Industry of the People's Republic of China
1993-07-01 Implementation
Chemical Industry Standard of the People's Republic of China
Rubber and Plastic Tensile Testing Machine
Technical Conditions
HG 2369 —92
This standard adopts the international standard TSO5895--1985 "Rubber and Plastic Tensile, Breaking and Compression Testing Machine Instructions" 1. Content and Applicable Scope
This standard specifies the structure, technical requirements, test methods and inspection rules of the tensile testing machine for measuring rubber, soft plastics and adhesive materials driven under constant reverse, but some tensile testing machines are only applicable to a few materials. This standard applies to rubber and plastic tensile testing machines (hereinafter referred to as testing machines). Tensile testing machines for leather, apples and other similar materials can refer to this standard.
2 Structure
2.1 Main structure
2.1.1 The testing machine is mainly composed of two parts: fixed parts and moving parts. Various types of clamps can be installed on both fixed parts and moving parts to hold various specimens: the moving parts are driven by power and equipped with a speed regulating device; the testing machine is equipped with a force measuring system with an indicator and (or) recording device and a device for measuring the deformation of the specimen. The moving parts should be driven smoothly without obvious swing, impact and other phenomena. 2.1.2. The size and structure of the testing machine shall not affect the accuracy of the test results and have the function of conducting various tensile tests on the predetermined test materials.
The moving distance of the mobile clamp of the testing machine should provide the maximum elongation range for the specimen. 2 1.3
2.1.4 The strain axis of the force system and the axis center line of the upper and lower holders should coincide with each other and be consistent with the direction of the force. 22 Grippers
2.2.1 When conducting tensile property tests on dumbbell-shaped, strip-shaped and similar flexible material specimens, the testing machine shall be equipped with a clamp (such as a wedge-shaped or pneumatic clamp) that can automatically clamp as the specimen elongates, and can apply uniform pressure to the specimen within the specimen's range. The specimen clamping method should try to avoid relative sliding between the specimen and the clamp. 22.2 The testing machine can be equipped with special-structured clamps dedicated to various test methods according to user requirements. These special clamps are required to prevent relative sliding of the specimen in the clamping, and the clamps cannot have an adverse effect on the accuracy of the test results. 2.3 Force measuring system
2.3.1 In all cases, the force measuring system must continuously indicate the force applied to the specimen; preferably, it should be equipped with an automatic recorder that can indicate the maximum force.
2.3.2 The explosive hammer force measuring system has the effects of drop and inertia, which seriously affect the dynamic response of the testing machine and reduce the accuracy. Therefore, the force measuring system should preferably be an electronic tensile testing machine with low inertia: 24 deformation measuring plate
4.1 Deformation measurement can be carried out by the following methods a.
Using the mobile clamp 1. Measurement method of contact automatic tracking device; c. Measurement method of non-contact automatic tracking device such as light and electricity. Approved by the Ministry of Chemical Industry of the People's Republic of China on September 15, 1992 and implemented on July 1, 1993. Manual tracking of sample marking line. HG2369-92. Note: This method is only applicable to the elongation value of several fixed points, and the different habits and proficiency of the operators give the measurement a great deal of randomness. 2.4.2 Deformation measurement The device should be connected to indicate the deformation of the sample. It is best to automatically draw a force-elongation curve and finally indicate the maximum elongation value.
24.3 When using a contact automatic tracking cover, the sample should not be damaged. There should be no additional force or sliding between the tracking clamp and the sample that will obviously affect the accuracy of the test results. 2.5. Safety device
The safety device should be flexible and reliable. When the load exceeds 2%-10% of the maximum load, the load safety device should immediately operate and automatically stop; when the moving part moves to the upper and lower limit positions, the limit safety device Action should be taken immediately to stop it from moving. 3 Technical requirements
Normal working conditions of the testing machine
At room temperature 20±10c range:
Correctly installed on a solid foundation;
In a vibration-free environment;
No corrosive media around:
Power supply, voltage fluctuation shall not exceed ±10% of the rated voltage; Humidity 10%~85%, no condensation,
3.2 Load error
The load error shall comply with the requirements of Table 1, where A and B are the force measurement accuracy levels of the testing machine. That is, for Class A and Class B machines, 1
Relative error of indication
Relative change of indication
α (%)
Load error classification diagram of testing machine
Less than one-fifth of each load level
Relative error of indication in and out
Relative error of indication (full range):
Relative change of indication (full range)
33 Zero return error
HG 2369 — 92
The absolute value of the load range
80100%
The load error classification of the testing machine
The error of the indication returning to zero after the load is removed shall meet the requirements of Table 2. 3
3.4 Deformation measurement error
Dial reading
Should not exceed ±0.2 divisions
Should not exceed ±0.5 divisions
HG 2369 -- 92
3. 4. 1 The deformation measurement error of the tensile test shall not exceed ±1 mm. Lesson
Digital readout shoe cover
Should not exceed 0.15% of the maximum load of the sample level
Should not exceed 0.2% of the maximum load of each level
3.4.2 When using an extensometer, its graduation value should be 1mm, and the graduation value of the scale for surface elongation measurement should be 5% of the specimen gauge length. 3.5 Moving part movement speed and allowable error 3.5.1 The testing machine must make the moving parts move at one or more speeds in the following classifications. 1±0.5mm/min
2±0. 6 mm / min
5±1.0mm/mim
10±2.0mm/mim
20±2. 5 mm / min
25±2. 5 mm / min
50±2. 5 mm / min
100± 10 mm / min||tt ||200±20mm/min
250± 25 mm/min
500± 50 mm/ min
For general use, the listed moving speeds are sufficient. Under special circumstances, the speed required by the experiment may exceed the speed range listed above, and its accuracy will also be different from the above values. 3.5.2 The speed of the moving holder under normal working conditions shall not vary by more than ±5% of the average speed and shall be kept within the limits specified in 3.5.1.
35.3 If the rubber testing machine adopts automatic return, its return speed shall not be less than 1000mm//min. 3.6 The coaxiality error of the upper and lower clamps of the testing machine shall not exceed @4mm within the range of 1000mm. 3.7 Dielectric strength
When the ambient air temperature is less than 20℃ and the relative humidity is less than 80%, it shall withstand the test voltage withstand test in Table 3 within 1min without breakdown and flying phenomenon.
Power circuit to casing
3.8 Insulation resistance
Test voltage
1500 V
The insulation resistance of the power circuit to the casing is greater than 7Mn under normal working conditions. 3.9 Appearance requirements
The paint colors should be coordinated, and the boundaries between different colors should be clear and should not contaminate each other. The surface of electroplated parts should be free of spots, rust, etc. b.
Test electric frequency
3.10 Noise
Noise sound pressure level shall not exceed 75dB (A)
HG 2369 - 9
3.11 Transport frequency test
Under packaging conditions, it should be able to withstand the transport turbulence test without damage, and the test machine after the bumps can still meet the requirements of this standard without adjustment.
4 Test method
4.1 Test conditions
The test shall be carried out under the conditions specified in Article 3.1 of this standard. 4.2 Test tools, measuring tools and instruments
Standard force measuring system certified by the profit department: b. Second assembly;
The accuracy of the length calibrator shall not be less than 0.5%); d. Sound level meter (level 1).
4.3 Load error test
4.3.1 Test range
For each range, the test is from 20% of the maximum nominal load to the normal nominal load, with no less than 5 test points, and each point should be roughly evenly distributed; no less than 2 points should be tested below 20%, 4.3.2 Zero position adjustment before test
Before the test, the zero position error generated by the gauge accessories must be balanced and the zero position must be adjusted. 4.3.3 The load error test is carried out in the following way, and the test results should meet the requirements of Article 3.2. a. The relative error of the indication (q) and the relative change of the indication (b) are tested three times in reverse according to the process. During the test, there is no recording device, but the mechanical testing machine should be equipped with a driven needle:
b, the relative error of the indication return and the relative error of the indication without a driven needle and a recording device are tested continuously from the process to the return in the recording of the smallest load range, and the errors are determined respectively. The relative error of the indication with follower needle and recording load shall be tested once in the minimum load range according to the process. 4.3.4 Calculation formula
20% of the maximum load of each level to the maximum load
×100%
20% or less of the maximum load of each level
Wu Zhong: F
Standard load in process:
HG 2369 —92
Arithmetic mean of the three indicated loads of the testing machine in process: the maximum value of the three indicated loads of the testing machine in process The minimum value of the three indicated loads of the testing machine in process: the indicated load of the testing machine in process;
The indicated load of the testing machine in return;
The maximum load of each level.
4.4 Zero return error test
Repeat the load for three times for each level, and check the zero position after unloading. It should meet the requirements of 3.3. 4.5 Elongation error test
Error test of deformation measuring device For the extensometers specified in item b and c of 2.4.1, the length calibrator with an accuracy of not less than 0.5% shall be selected for inspection according to their different measuring ranges,
tools. Connect the extensometer to the calibrator correctly, adjust the zero point, operate the calibrator to apply displacement point by point, and record the indicated value of the extensometer at the same time until the full range is reached, then return the extensometer to the military point, repeat three times, and obtain three groups of indications,,b. Using the above data, calculate the indication error of each group and each point respectively, which shall comply with the provisions of 3.4. The calculation formula is:
X 100%
Wu Zhong: Group i, i-th point deformation indication error (%); Ly Group i, j-th point calibrator displacement disk (mm): ig Group i,, j-th group extensometer indication value (mm). 4.6 Moving speed test of moving parts
4.6.1 Use a stopwatch to check the moving speed of the moving parts. It should comply with the machine grade (6).
To ensure the accuracy of the measurement, the displacement of the moving clamp during the test shall not be less than 10m/s, and the speed during movement shall not be less than 30°. 4.6.2 No-load moving speed test
Within the range of each grade, test no less than three points. Each point shall be tested twice in succession. The arithmetic mean of the two measurement results shall be taken as the measured speed.
4.6, 3 Loaded moving speed test
Add load (special equipment, puller or specimen) to stretch. When the test load is 70%-100% of the maximum nominal load of the testing machine, measure and calculate the speed
4.6.4 The speed variation error shall be calculated according to the following formula. The calculation result shall comply with the requirements of 3.5.1. Speed error =
Speed variation error
Where: V-actual speed of each point (mm/min): X100%
V. Nominal speed (mm/min);
The arithmetic mean of the measured speeds at each point when empty and loaded (mm/min) 4. T Coaxiality error test
After moving the movable chuck to a chuck spacing of 500mm or 1000mm, remove the upper and lower chucks, hang a sharp hammer at the axis of the base pin hole connecting one chuck, and measure the horizontal distance from the torsion tip to the axis of the lower base pin hole with a ruler. The error shall meet the requirements of Article 3.6.
Insulation strength test
Perform on insulation strength tester as per Article 3.7. During the test, slowly increase the specified voltage, maintain for 1min to observe whether there is breakdown and arcing, then slowly decrease to zero and cut off the power supply.4.9 Insulation resistance test,
Use 500V megohm as per Article 3.8.
4.10 Appearance test
The test shall be carried out visually in accordance with the requirements of Article 3.9.
4.11 Noise test
4.11.1 Noise measurement steps are as follows:
The sound level meter should face the sound source and be parallel to the horizontal plane: the sound level meter should be 1.5m above the ground;
The reading distance between the sound level meter and the test machine should be 1m;
There should be no less than six measuring points around the test machine, and the maximum reading value measured at each measuring point shall be taken as the instrument noise. The sound pressure test should be carried out at the maximum pressure level when the test machine is running, usually at the highest test speed (including high-speed return).
4.11.2 When measuring noise, the background (ambient) noise should be measured first. Its value should be at least 10 dB lower than the sound pressure level of the test machine. If the difference is less than 3 dB, the measurement is invalid. If the difference is 3-9 dB, it should be corrected according to the following table: Li-
In the table: Z, the noise sound pressure level during measurement: L-background noise sound pressure level;
AL-corrected value, the noise sound pressure level is L-4L. The test machine noise sound pressure level is L,-AL.
4.12 Transportation test
After the instrument is packed, drive it on a third-class highway at a speed of 30-40km/n for 20 0km, conduct a comprehensive inspection according to this standard. 4.13 Power supply voltage change response test
Connect the power supply of the test machine to an adjustable transformer, adjust the power supply to 10% of the rated voltage, and use the method in Article 4.6 for speed test. It should also comply with the requirements specified in Article 3.5. 5 Inspection rules
Each test machine must be inspected and qualified by the quality management department and accompanied by qualified documents before leaving the factory. 5.1
5.2 Test items
5.2.1 The test machine is divided into two categories: wide test and type test. The factory test is carried out one by one according to Articles 3.2-3.10 of this standard. a
Type test shall be carried out by sampling inspection in accordance with Article 3.1e and Article 3.2-3.11 of this standard. bh.
Type test shall be carried out in the following cases
New products (including old products converted into new products): products with major changes in design, process or materials and supporting components and devices used. h
Products produced in batches shall be inspected regularly. e
d. ．Quality evaluation of similar products.
5.2.3 Sampling
HG 2369 -- 92
Type test shall be carried out by sampling inspection regularly, generally once a year, and no less than 2 units shall be inspected each time. 5.2.4 Judgment rules
If there are unqualified items in the test machine during the factory test, it can be repeated once and re-inspected. If there are still unqualified items, the product shall be judged as unqualified.
6 Type test is carried out on products that have passed the factory test. If one unit fails in the random inspection, it can be repaired once, or re-inspected. If it still fails, the batch of products is judged to be unqualified. If two units fail on the same day, the batch of products is judged to be unqualified.
G Completeness of testing machine
61 The testing machine supplied as a complete set includes: the machine body and supporting instruments, 2 Random documents include: instruction manual, factory certificate. Packing list. 7 Marking and packaging
7.1 Each testing machine should have a nameplate, including: instrument name, instrument model, factory date, factory abbreviation, and manufacturer's name. The testing machine should be firmly fixed in the packaging box to ensure that it does not move in any direction during transportation. 7.2
7.3 The material and structure of the packaging box should prevent wind, sand and water from invading the box. 7.4 The accessories should be packed with oil seals.
7.5 The contents of the packaging box label include:
Manufacturer name, testing machine model and factory abbreviation; consignee and address;
Box size, gross weight, box centerline and hanging case position; d "upward", "precision instrument", "handle with care" and other words and drawings. Additional notes:
This standard was proposed by the Ministry of Chemical Industry and is under the jurisdiction and interpretation of the Beijing Rubber Industry Research and Design Institute. This standard was drafted by the Beijing Rubber Industry Research and Design Institute and Shanghai Chemical Machinery Factory No. 4. The drafters of this standard are Huang Langrong, Zhuang Xuekang, Zeng Tianen, and the People's Republic of China
Chemical Industry Standards
Technical Conditions for Rubber and Plastic Tensile Testing Machines
HG 2369 -- 92
City Chemical Industry Standards Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013bZxz.net
Printing Standardization Research Institute of the Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format 880 × 1230 1 / 16
Number of words on a sheet 16000
First edition in July 1993
First printing in July 1993
Number of copies 1-500
Cost 2.30 yuan
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