The Research Of Reliability-based Robust Design For Key Components Of High-speed Stamping Equipment Based On Interval Numbers

Various sources of uncertainties widely exist in the process of design, manufacture, assembly and operation of high-speed stamping equipment, which makes the makes the traditional deterministic design methods cannot meet the increasingly high robustness and high reliability requirements of modern industry. The probability distribution of these uncertain factors to too difficult or costly to obtain, but the variation range of them is much easier to get, so it is suitable to use interval numbers to describe them to carry out the research of reliability-based robust design of the key components of high-speed stamping equipment and its application. This must be significant to ensure the quality performance, reliability and robustness of high-speed stamping equipment. The main contents of this paper are as follows:The first chapter introduces the development situation of high-speed stamping equipment, summarizes the research status and shortcomings of robust design, reliability design and the approximate model technology, and at last puts forward the research significance and major contents of this paper.The second chapter introduces the interval theory and its application in the robust index and reliability index, then introduces the basic steps of constructing the approximate model and does some contrastive analysis between different approximate models, based on which introduces the polynomial surface models that based on objects’ reverse updating.The third chapter proposes a robust design method for key components of high-speed stamping equipment that based on interval sequence vector, constructs the robust design model of high-speed stamping equipment’s key components, combines the interval sequence vector based ordering method, nested genetic algorithm and approximate model technology to directly solve the robust design model, which can avoid the loss of uncertain information in the process that interval model transforming to deterministic and the subjectivity of choosing the weight factor of weighting method. At last, verifies the effectiveness of the method of this chapter by applying it in the robust design of the slider of 300L4 high-speed press.The fourth chapter proposed a reliability-based design method for key components of high-speed press equipment that based on degree of dominance between intervals, constructs the reliability-based design model of high-speed stamping equipment, calculate the interval based reliability index by the degree of dominance between intervals, and gets the solution by the nested GA. At last demonstrates the usefulness by applying the method on the design of 300L4 high-speed press’s upper beam.The fifth chapter proposed a reliability-based robust design method for key components of high-speed stamping equipment that based on the interval dynamic property, puts the reliability degree of first few order natural frequency as constraints due to the analysis result of initial design, and constructs the reliability-based robust design model for the dynamic property of high-speed stamping equipment’s key components, then gets the solution by combining degree of dominance between intervals, interval sequence vector and degree of constraint violation. And at last proved the effectiveness of this method by applying to the 300L4 high-speed press’s pedestal.The sixth chapter summarizes the research contents and typical applications of this paper and prospects the future research direction.