More and more users regard the accuracy of displacement testing as a standard to measure the level of testing machines. Because the primary requirement for small-load springs, especially high-stiffness precision springs, is high testing accuracy of the equipment, because small changes in displacement will cause large changes in the test force, and it is very easy to ensure the testing accuracy of the test force. However, ensuring the accuracy of the displacement of another parameter of the spring testing machine is the key to ensuring the accuracy of the spring testing, and it is also the standard for judging the accuracy of the spring testing machine.
In the national standards for spring testing machines, the requirements for displacement accuracy are very low and cannot meet the requirements for large-stiffness precision springs. Therefore, testing machine manufacturers must improve the displacement testing accuracy to meet user requirements. There are many factors that affect the displacement test accuracy, such as detection methods, complete machine structure, complete machine stiffness, parallelism of the pressure plate, measuring components, materials, load displacement subsidence, etc. As long as these factors are overcome, the displacement accuracy cannot be guaranteed. questionable.
The spring testing machine detects the displacement strictly in accordance with the standards, which can ensure that the test force is basically the same when the spring is placed in different places on the pressure plate, ensuring that within the full range of the test force, any load will not cause the load sensor to shift. Shen. In addition, the impact of the loading method of the spring testing machine on the test results cannot be ignored. The early loading method mainly used ordinary AC motors 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 fast compression is different from the data collected during slow compression or static compression. The data vary greatly. Nowadays, variable speed systems such as AC servo speed control systems are often used to realistically simulate the working state of the spring and truly measure the internal stress of the spring in this state to provide a basis for spring design.
With the development of computer technology, the shortcomings of relatively simple functions of single-chip microcomputers have been improved by microcomputers. Intelligent function setting expert system, parameter selection, database, clear window Chinese interface, and simple mouse operation make the spring testing process the most efficient. The ideal state has become possible, and the level of intelligence has been greatly improved. The operator can measure and control according to any preset mode by just clicking the mouse, and set different test speeds and parameters during the test. , so that the test mode and the entire 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, organized, and output according to industry standards or corporate standards, and past test processes and tests can also be Query the results, and the powerful calculation and mathematical statistics functions replace the complicated work in the past, greatly reducing human labor.
In addition, the application of computer network technology will combine the detection control machine (referred to as the lower computer) with the main control computer of the computing center (referred to as the upper computer) to realize the transmission, processing and comprehensive management of test data. In the central laboratory, The upper computer implements comprehensive management of the lower computer fleet.
