英文摘要 | In modem manufacturing industry, the applications of industrial robots are expanded to deeper and broader fields. As one of the main technical indices of industrial robots' quality, reliability is being paid more and more attention. The crux of industrial robots' practicality and commerciality are: reliability, maintainability, safety and cost. Therefore, at the beginning of the designing, manufacturing and application of industrial robots, attentions should be paid to the reliability of industrial robots. The analysis and design of reliability have been one of the imperative parts in the production of modern industrial robots. Based on the reality of the production of industrial robots, the analyzing and designing methods of reliability for industrial robots are discussed in this dissertation. The related reliability theories are introduced, such important indices as reliability, unreliability, failure ratio and Mean Time Before Failure (MTBF) are put forward, and the relationships between these indices are given. Then the following issues are emphasized in detail: 1. Prediction of Reliability. The Prediction of Reliability is the method which estimates the reliability of future products quantificationally in the designing stage. The purpose, meaning and means are discussed, the prediction of reliability is carried out with the exemplification of a spot- welding robot controller. The prediction uses the Component Stress Analyzing Method, based on the U.S. Military Standard MIL-HDBK- 217E, predicts the reliability of different components according to their environments and stresses. Then the prediction of reliability of the system is proceeded. 2. Thermal Design of Reliability. The purpose, requirements and means are introduced, the thermal design of reliability is carried out with the exemplification of an arc-welding robot controller. The size of the controller box is appraised, according to the heat density of the controller box. Using a circuit simulation method, the mechanism model of the temperature and heat flow in the controller box is set up, and the expressions on the relationship of inside and outside temperatures of the controller box can be derived. Several improvement schemes of thermal design are put forward, and real time temperature test of the controller box is carried out. 3. The Software of Reliability Analyzing. The background, purpose and contents of the research on the software are given, and the running introduction of the software is presented. The software makes the analyzing of reliability more standardized, relieves the analyzers of the trivial works of database operation, maintenance and manual calculations, thus saves manpower and material resources. Based on the industrial robot controller |
修改评论