How to choose plastic tensile testing machine correctly
The difference between electronic testing machine, hydraulic tensile testing machine and universal material testing machine
Definition and overview of plastic tensile testing machine:
Plastic tensile testing machine is also called tensile testing machine. Tensile testing machine is a mechanically forcing testing machine used for mechanical properties testing such as tensile, compression, bending, shearing and peeling of materials. It is suitable for plastic plates, pipes, Profiles, plastic films and various physical and mechanical performance tests of rubber, wire and cable, waterproof coiled material, metal wire and other materials, and their use ranges from industry to scientific research institutes, commodity inspection arbitration institutions, colleges and universities Wire and cable, shoemaking, leather, textile, packaging, building materials, petrochemicals, aviation and other industries, indispensable testing equipment, tensile machine The fixture is an important part of the instrument. Different materials require different fixtures. It is also an important factor for the smoothness of the test and the accuracy of the test results.
Notes on the selection of plastic tensile testing machine:
1. The tensile range of the test material should be considered first.
The difference in the pulling force range determines the difference in the sensors used, which also determines the structure of the pulling machine, but this item has little effect on the price (except for the door type). For general flexible packaging manufacturers, a pull range of 100 Newtons is sufficient. Therefore, it was decided to use the single-arm type.
The structure corresponding to the single-arm type is the portal structure, which is suitable for relatively large pulling forces, such as one ton or more. Therefore, flexible packaging manufacturers basically do not need it.
Second, the problem of test schedule.
According to the performance and requirements of the flexible packaging film, the stroke can be 600-800mm. If the material elongation exceeds 1000%, the stroke of 1000 or 1200mm can be used.
3. The standard configuration of plastic tensile testing machine.
Three basic intelligent configurations: host computer, microcomputer, and printer. If the microcomputer has strong functions, you can print directly. It can also be equipped with ordinary computers. With a computer, you can perform complex data analysis, such as data editing, local zoom, adjustable report format, and statistical analysis in groups.
If equipped with a computer, the manufacturer should add the corresponding control system.
4. The output of plastic tensile testing machine.
The test result output can be arbitrarily set: maximum force value, elongation, tensile strength, constant force elongation, constant elongation force value, yield strength, elastic modulus, maximum test force 8 items. This can be said to be the most comprehensive result output when the microcomputer is operated. The products of some foreign manufacturers can generally output these 8 items. Some domestic manufacturers can output 5-6 items, and some manufacturers can only output the maximum force value, average value, and minimum value.
Fifth, on experimental projects that can be done.
Flexible packaging requires a multi-purpose tensile machine, that is, on the basis of different fixtures, it can be used for tensile, compression, bending, tearing, shearing, 180 degree peeling, and 90 degree peeling tests.
In addition to the above items, there are some high-end tension machines on the market that can test the coefficient of friction due to their high sensor accuracy (some reaching 150,000).
6. Main configuration of product machinery:
Transmission, there are screw drive and rack drive, the former is expensive, used for high precision, high test repeatability; the latter is cheap, used for low precision, low test repeatability.
The lead screw plays a decisive role in the measurement of tension accuracy. The general ones are ball screw, trapezoidal screw and general screw. Among them, the accuracy of the ball screw is the highest, but its performance can only be achieved by the operation of the computer servo system, and the whole set is relatively expensive. The precision required for flexible packaging, that is, 0.5-1% accuracy, can be achieved by using general screws and trapezoidal screws.
Transmission, there are gear transmission and chain transmission, the former is expensive and used for high precision; the latter is cheap and used for low precision.
The main cost of the sensor is life. The photoelectric sensor is one of the more advanced technologies. It is generally available for more than 100,000 times. Imported and domestic joint ventures can achieve better technology. Shanghai Trust Instrument Co., Ltd.
7. Test speed.
Some of the equipment on the market is 10 ~ 500 mm / min, and some is 0.001 ~ 500 mm / min. The former generally uses a common speed control system, which has low cost and roughness affects accuracy; the latter uses a servo system, which is expensive and has high accuracy For flexible packaging companies, the servo system is used, and the speed range of 1 ~ 500mm / min is sufficient, so that the accuracy is not affected, and the price is within a reasonable range. Vortex flowmeter
8. Measurement accuracy.
Accuracy issues include force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values ​​can be up to plus or minus 0.5. But for general manufacturers, 1% accuracy is sufficient. In addition, the resolution of the force value can almost reach the ten thousandth of the tensile machine
Technical parameters of plastic tensile testing machine:
1. Accuracy grade; Grade 1
2. Force measuring accuracy: 1N
3. Speed ​​accuracy: <± 1% of indicated value
4. Test speed: 0.5mm / min-500mm / min 14 gear speeds (please specify when there are special requirements) (test speed: 0.001mm / min-500mm / min) multiple gear speeds
5. Force measuring range: 50N, 100N, 200N, 500N, 1000N, 2000N, 5000N
6. Power supply: 220 AC50Hz
YF-900 series of microcomputer controlled plastic tensile testing machine is a precision single-arm high-end testing machine, using single-chip microcomputer and PC distributed control system, with a PC-controlled operating platform, through the Chinese operating interface of Windows98, Windows2000 or WindowsXP, during the test process Real-time display of the instantaneous force value, displacement value, fracture value, peak value of the maximum force value, automatic stop, and can dynamically draw real-time tensile displacement value and tensile force value (compression displacement value and compression force value) The curve and other functions can automatically record the test data and post-process the data. The test report can be automatically printed and the historical record can be saved, so that the previous test data can be queried at any time in the future to conduct a comparative study of various test data.
YF-900 series microcomputer controlled plastic tensile testing machine is fully in accordance with GB / T16491, GB / T1040, GB / T8804.1, GB / T8804.2, GB / T1041, GB / T9341, GB / T8808, GB / T18477, GB / T T583, GB13022 and other standards provide convenient operation, reasonable design, and simple structure. They have excellent performance-price ratio among similar models.
Calibration method of plastic tensile testing machine 1. Correction of the strength value of tensile testing machine (tensile machine): after entering the computer program, open the calibration interface, press the test to start, take a standard weight weight and hang it on the upper fixture connection base, record the computer Display the strength value and calculate the difference with the standard weight, the error should not exceed ± 1%. 2. Speed ​​correction of tensile testing machine (tension machine): 2.1 First record the initial position of the machine crossarm, select the speed value on the control panel (use a standard straight steel ruler to measure the travel of the crossarm). 2.2 While starting the machine The electronic stopwatch starts timing for one minute, press the stop button of the machine at the same time as the stopwatch reaches the time, and according to the time of the stopwatch, record the crossarm travel value as the rate per minute (mm / min), observe the crosswalk travel value and straight steel rule The difference, and calculate the travel error value of the crossarm, should not exceed ± 1%.
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