Finite Element Analysis Of The Assembly Of A Servo Press And The Structure Optimization Of The Airframe

Lightweight and high-precision forming has become the subject of materials forming in the 21st century. Tradional mechanical presses have been unable to meet the development needs of this time. However, with the successful research of the servo press, and along with the unique feature of optimition curve based on processing technology, as well as high-precision, low noise and less energy-consuming, we can see that servo press will lead the trend of materials forming in the 21st century.In the beginning of this paper, servo press is designed based on the traditional crank press. Then I have designed the main components in the servo press based on the empirical formulas and established the three-dimensional modal of components and assembly. But the experience does not mean the science. The servo press designed based on empirical formula is also need to check with scientific methods.Then, I carry out the assembly finite element analysis of the servo press and obtain the distribution of displacement field, stress field as well as strain field in the assembly and in various parts of the assembly. As the previous simulation of servo press is carried out of individual parts based on some certain assumptions. Therefore, the finite element analysis of servo press not only simulate the realities of the situation more truthful, we can also compensate the mold based on the displacement curves of plate and slide that are extracted from the results, then we can improve the accuracy of parts forming.The concept of optimal design is always reflected in the nature and it is our goal in our design. In the fourth chapter, we have carried out the lightweight design of the airframe which possess the most weight of the servo press. Most previous method of lightweight design is zero-order optimization. In this paper, I have carried out the first-order optimization on the basis of the zero order optimization. In the end, the weight of the fuselage reduce 19.6%.In the end of this paper, based on the results of assembly finite element design and optimization design, I improve the original design and then carry out the simulation of the improved model, I have received a reasonable distribution of stress field, furthermore, in the condition of the weight of airframe has reduced 15.5% and the weight of assembly has reduced 11.7%, the angle stiffness and vertical stiffness of the servo press have increased by 9.6% and 7.8%.