Hits:Updated:2020-04-25【Print】
First of all, it is necessary to test the accuracy of the foundation of the universal tensile testing machine before the tensile strength test. We need to prepare tensile test samples, the best value is between 60-90% of the tensile test machine test interval. Clamp the sample on the electronic universal tensile testing machine, and let the tensile testing machine perform the tensile strength test on the standard sample according to the standard speed of GB / T 228.1-2010.
When the sample is greater than 90% of the additional force of the tensile testing machine, it is necessary to immediately stop the stretching and leave the sample in a stretched state, and then attach an extensometer or strain gauge to the sample of the electronic universal tensile testing machine, according to GB / T228 .1-2010 standard allows the electronic universal tensile testing machine to test the tensile strength of the sample. Use Hooke's law to calculate the apparent amount of stretching to obtain the tensile value of the test. Compare with the force value point on the tensile testing machine. By comparison, we can know the situation and accuracy of the electronic universal tensile testing machine.
The electronic universal tensile testing machine will have problems such as wear during long-term use, so as the working time of the tensile testing machine increases, the wear and damage will become more serious. These losses cause the accuracy of the instrument to decrease. Some spare parts accelerate the wear and damage of the electronic universal tensile testing machine because of the poor working conditions of the equipment. If it can be protected normally during work, the function and accuracy of the tensile testing machine will be kept in good condition. So how important it is to protect the electronic universal tensile testing machine every day.This introduces you to several points that need to be paid attention to in the tensile strength test of several electronic universal tensile testing machines: 1. It is not allowed to use the things with different diameters to bend the steel bars, especially the small diameter things to bend the large diameter steel bars.
2. After each use of the tensile testing machine, the piston does not need to quickly fall to the bottom of the cylinder, it can leave a little distance, which is good for the next work.
3. When the electronic universal tensile testing machine is out of service for a long time, it should be coated with anti-rust oil on the outside and placed in a monotonous environment.
4. Insist on cleaning the electronic universal tensile testing machine regularly.
5. The professionals who do not understand the structure of the tensile testing machine should not be allowed to stop and disassemble the equipment.
6. The valve on the dynamometer should not be opened to prevent dust and other impurities from falling into the interior and affecting the sensitive function of the organization.
7. When disassembling and assembling electrical appliances, it is necessary to cut off the power before proceeding, otherwise the electronic components will be easily damaged.
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