Thread Content
As people's research on bearings continues to deepen, fatigue life and reliability, as the most important properties of bearings, have attracted widespread attention from various bearing production units and related users. However, because there are too many factors that affect its fatigue life and the theory of bearing fatigue life still needs to be improved, life testing has undoubtedly become the only effective way to evaluate this indicator. Conventional life test methods with low load and high speed are time-consuming and labor-intensive and the test results have poor reliability. However, the use of advanced bearing fatigue life enhanced testing machines and test methods has just started in my country, and the scope of application needs to be further expanded. How to strengthen exchanges and cooperation in life testing technology, promote the development of bearing fatigue life rapid testing technology, and promote the application of bearing fatigue life rapid testing technology are issues faced by the bearing industry for a long time to come. Current status of domestic bearing life testing technology my country's bearing life testing work started later and is smaller in scale than foreign bearing companies such as SKF, INA/FAG, Timken, NSK, NTN, and KOYO. At present, it has established its own bearing life, reliability and performance testing bases in Luoyang Bearing Research Institute, Hangzhou Bearing Test and Research Center and other units, and is responsible for the bearing life, reliability and performance testing work of my country's bearing industry. We are currently in the stage of accumulating a large amount of test data, so that at an appropriate time in the future, we can formally propose recommended values for each correction factor for domestic bearing life calculations. Since the mid-1980s, various bearing research and production units have independently developed and introduced some new bearing testing equipment from foreign bearing companies, filling the gaps in certain domestic bearing testing fields. For example, the Hangzhou Bearing Testing and Research Center introduced a B-type bearing life-enhancing testing machine from the United States at a high price with United Nations aid funds. On the basis of introduction, digestion and absorption, independent innovation has successfully developed the ABLT series of bearing life-enhancing testing machines, which has played a certain role in promoting the improvement of bearing life and performance testing technology in my country. However, most of the current equipment still belongs to the category of simulation or functional testing, and its test content and results have limitations. However, basic theoretical research on various influencing factors of bearing life and bearing failure mechanisms is still insufficient, and there is still a large gap with the world's advanced level. As my country accelerates the pace of building a bearing power and users increase their requirements for bearing life and performance, bearing testing equipment and testing methods will continue to be introduced, and the development of bearing life testing technology will present a very optimistic prospect. Correctly understand the role of simulation tests. With the rapid development of science and technology, bearing life test standards and their theories have also kept pace with the times, and have shown a development trend of automation, intelligence, and personalization. For more than 40 years, my country's bearing industry has been following the specifications of the former Soviet Union in the 1950s, using ZS-type testing machines to conduct life tests. This method has a long test cycle and high consumption, and can no longer meet the needs of current production and scientific research development. Therefore, newly developed bearing life testing machines use automation technology to varying degrees to solve this problem. Intelligence is the further development of automation. The speed spectrum, load spectrum, etc. can be set according to standards to meet the test requirements. At the same time, the test results can be processed intelligently using knowledge base technologies such as artificial intelligence and expert systems to achieve the requirements of speed, efficiency and economy. Personalized testing based on standard testing refers to the "deviation" of the bearing life test from the standard bearing life test in order to meet the special testing needs of certain specific testing conditions. For example, metal powder or contaminants are added to lubricating oil to study their impact on bearing life. As early as the 1940s, the United States began to use single-factor environmental simulation development tests and qualification tests for product design to test the quality and reliability of the design. In the 1970s, the Comprehensive Environmental Simulation Reliability Test (CERT) and mission profile tests were developed. To verify the process, an acceptance simulation test without design margin is used. With the development and maturity of environmental simulation test technology, various countries * * Departments and military services have successively promulgated a series of national standards and military standards to ensure product quality and reliability in the form of strict regulations. For a long time, environmental simulation testing has become the main means to ensure product reliability. The shortcoming of simulation test technology is that design and process defects are not specifically dealt with, and are only solved through identification testing and acceptance respectively. Therefore, there are still many potential defects remaining, and failures may occur at any time when used in the field. The increase in reliability is slowly achieved by natural feedback. At this time, the work is done, and the time and space left for design modifications are extremely limited, thus greatly reducing the advantage of market competition. In my country's bearing industry, due to the lack of a deep and comprehensive understanding of the simulation test process, simulation test technology has a tendency to be misled, and the role of simulation testing has been one-sidedly exaggerated. Due to the complexity and high cost of environmental simulation coupling, simulation test technology has shown a building-block and modular development trend.