國外高檔加工中心自動換刀系統(tǒng)的可靠性研究
[Abstract]:With the improvement of the function level and automation degree of mechanical equipment, the possibility of machine tool failure is increasing, and the reliability problem has seriously restricted the development of CNC machine tool. As an important part of the machine tool, the reliability level of the key functional parts of machining center directly affects the reliability level of the whole machine, such as the tool changing system, the electrical system and the spindle, etc. Once these key functional components fail, It will directly affect the machining efficiency of the whole machining center as well as the economic benefits of the users. Automatic tool-changing system is an important part of high-grade machining center, and it is an important part of the performance of high-grade machining center. Although the automatic tool-changing system made in China can basically meet the functional requirements, its reliability level can not be compared with the advanced products abroad, which seriously restricts the development of the domestic CNC machine tool industry. Therefore, if the reliability of automatic tool-changing system is improved, it will be helpful to improve the reliability level of domestic high-grade NC machining center. Domestic scholars in the reliability of the whole machine, has a certain theoretical basis. For the purpose of short-term return on investment in domestic machine tool enterprises, domestic scholars can not carry out tracking experiments on automatic tool-changing system for many years, and can not obtain reliable and sufficient fault data, which limits its reliability-related research. And there are relatively few literatures on reliability modeling of automatic tool-changing system. In addition, the research on it is not comprehensive, there are many shortcomings. Therefore, it is necessary to study the reliability of automatic tool changing system. This can help to shorten the reliability growth period of automatic tool changing system and provide theoretical reference for product reliability improvement design and fault diagnosis and maintenance. At the same time, in engineering, there is great reference value for the related research of similar products. Based on the fault data collected under the field tracking test, this paper uses the fault total time method to pre-process many groups of different types of data, so as to provide a more accurate data basis for the subsequent reliability analysis. Based on the empirical modeling theory and the three-parameter Weibull distribution model, the reliability models based on the fault interval time of the whole machine are established by introducing the least square method, the right approximation method and the KS test, respectively. Based on the reliability model of the fault interval time of the automatic tool changing system and the first failure time of the automatic tool changing system, a more accurate reliability model can be obtained. Combined with the above three models, the mean fault interval time, the average fault interval time and the average first fault time of the automatic tool changing system are obtained by using the point estimation method. The improved hazard method is used to analyze the fault modes of the whole machine and the automatic tool-changing system respectively, so that more reasonable experimental results can be obtained, and the posterior probability model of the automatic tool-changing system and the whole machine is established by using the Bayes posterior probability model. The relationship between automatic tool changing system and other systems is established by grey relational analysis.
【學(xué)位授予單位】:延邊大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TG659
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