To ensure the accuracy of the inspection data. To achieve the consistency of the comparison, the article will summarize the following points of experience when using the pressure testing machine according to the actual experience, to avoid and reduce the test error and improve the accuracy of the test. Plastic Scraper,Plastic Scraper For Wallpaper,Multipurpose Plastic Scraper,Multipurpose Plastic Wallpaper Scraper Jiangmen Nichiyo Decorative Material Co.,Ltd. , https://www.nichiyopt.com
1Testing of the pressure testing machine The testing machine is a testing device that applies the load to the tested test piece under the above loading method to measure the corresponding mechanical properties. The force value reflected by it is uniform. Sexuality and consistency, the force value displayed on the test machine is obtained by step-by-step transmission through the national force value benchmark. To ensure the accuracy of the indication value, the "Measures Law of the People's Republic of China" stipulates mandatory periodic verification of the measuring instrument. . All test machines that have been newly installed or used for one year must be re-qualified before they can be used. The material inspection requires that the error accuracy of the test machine is within 1.0% x + 1.0% (x-test) The relative error of the machine).
2 degree disc selection In order to save materials, the scope of use of the testing machine is expanded. There are generally more than two dials on the test machine. Before the test, the maximum load of this test should be estimated, and the corresponding measurement range should be selected to change the different pendulum. a. Why do you have an estimate of the maximum load before the test? Choosing the corresponding pendulum? This is because if the tested test piece has high strength and the used dial is small, then the highest strength value of the test piece must not be obtained in this dial, and it must be replaced. The large pendulum is again detected. Structural damage may have occurred due to the test piece being tested in the small disk load, especially when the ultimate strength value of the test piece is near the limit range value of the dial. Therefore, this test is performed. The resulting data will increase the amount of error. If the strength of the tested test piece is too low, the range of the used force value is too large, then the systematic error content of the test result will increase, and the measurement error will also increase. This is because when the limit force value is used, the range is large. When the dial is used, the index value is also increased accordingly, and the strength value of the test specimen is small, which causes an increase in the data estimation error. Therefore, it is necessary to estimate the maximum load value of the test piece before the test. h. How best is the selection of the dial? Let's do a test first. If the existing 30kN force is to be tested, select a different dial and get the following result: If you choose 60kN ç £. The pointer will go 50% of the dial; if you choose 200kN, the pointer will go 15% of the dial; if you choose 300kN, the pointer will go 10% of the dial. From these three data, it can be seen that the choice of 60kN is most suitable, the speed is easy to control, and the data fluctuation is small. Practice has proved that when the machine pointer is operated within the range of 20% to 80% of the dial, it is suitable for operation and the error fluctuation is small. To this end, we should pre-estimate the strength of the test piece before the test, so that the test piece can obtain its ultimate strength value within 20% to 80% of a certain disk during the force measurement to determine the dial range used in the test. Achieve the purpose of reducing errors.