How to judge the standard of precision of spring testing machine

Release time:

2021-07-28

The primary requirement for load springs, especially high-stiffness precision springs, is the high test accuracy of the equipment. Because small changes in displacement will cause large changes in the test force, it is easy to ensure the test accuracy of the test force. However, to ensure the accuracy of the displacement of another parameter of the spring testing machine is the key to ensure the test accuracy of the spring and the standard to judge the accuracy of the spring testing machine. Therefore, more and more users, the displacement test accuracy as a measure of the level of the standard test machine. In the national standard of spring testing machine, the requirement of displacement accuracy is very low, which can not meet the requirements of large stiffness precision spring. Therefore, for testing machine manufacturers, it is necessary to improve the displacement test accuracy to meet the requirements of users. There are many factors that affect the accuracy of displacement test, such as detection method, machine structure, machine stiffness, parallelism of the pressure plate, measuring elements, materials, load displacement sinking, etc. As long as these factors are overcome, the guarantee of displacement accuracy is not a problem.

The spring testing machine is strictly in accordance with the standard for displacement detection, to ensure that the spring placed in different parts of the pressure plate test force is basically the same, to ensure that in the full range of the test force, any load will not cause the displacement of the load sensor sinking. In addition, the influence of the loading method of the spring testing machine on the test results can not be ignored. The early loading method mainly used ordinary AC motor to drive the transmission system to load, and the loading speed cannot be adjusted. For elastic components such as springs, due to the existence of rebound stress, the data automatically collected during rapid compression is very different from the data collected during slow compression or static compression. Now, variable speed systems such as AC servo speed regulation system are mostly used to simulate the working state of springs through realistic, the real measurement of the internal stress of the spring in this state provides the basis for the design of the spring.

With the development of computer technology, the simple function of single chip microcomputer has been improved by microcomputer. Intelligent function setting expert system, parameter selection, database, clear window Chinese interface and simple mouse operation make it possible to idealize the state in the spring test process, and the intelligent level has been greatly improved. As long as the operator clicks the mouse, he can measure and control according to any preset mode, by setting different test speeds and parameters in the test process, the test mode and the whole test process can be controlled according to people's will, the test curve and test data can be displayed in real time, the test data can also be calculated, sorted and output according to industry standards or enterprise standards, and the previous test process and test results can be queried. Powerful calculation and mathematical statistics functions replace the complicated work in the past, it greatly reduces the amount of human labor.

In addition, the application of computer network technology will combine the detection and control machine (referred to as the lower computer) with the main control machine (referred to as the upper computer) of the computing center to realize the transmission, processing and comprehensive management of test data, and in the central laboratory, the upper computer will realize the comprehensive management of the lower computer group.

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