Static And Dynamic Analysis And Structure Optimization Design Of The Key Parts Of HDL-50Machining Center

Top-grade NC Machine Tool is the main processing equipment of modern manufacturing industry, while horizontal machining center is particularly the one with highest processing efficiency and largest production batch. The rapid development of manufacturing industry requires higher speed, higher efficiency, higher precision and higher reliability of machining center. The static and dynamic characteristics of machine tool depend on those characteristics of key parts, but experience are widely used by designers in traditional design process, restricting the development of machining center’s performance. As a consequence, it is an effective way to improve the performance of machining center by improving the static and dynamic characteristics of key parts.Relying on the major national science and technology project of High-grade NC Machine Tool and Basic Manufacturing Equipment, taking the horizontal machining center-HDL-50as research object, this paper is aimed at researching for a way of designing high-grade NC machine tool with high rigidity and lightweight. For this purpose, the main research works are carried out as follows:Firstly, the paper calculates maximum working load of actual working conditions, and get the result of external load of each key part according to the structure of the horizontal machining center; With the results of external loads, the paper establishes the finite element model of key parts of the horizontal machining center, and analyzes the static and dynamic characteristics of them to determine the weak links of each key part, which provides a reference for subsequent structural optimization design.Secondly, the paper carries out the modal test and analysis on the key parts of the horizontal machine center by the method of single-point excitation and multipoint collection, and gets each order parameters of key parts. The paper verifies the correctness of the finite element model by contrasting the experimental results and finite element analysis results.Thirdly, the paper carries out the topology optimization design of the key parts of the horizontal machine center in different working conditions, determines the optimal transfer path of the load of the structure under multi engineering conditions. According to the optimal transfer path of the load by the topology optimization, the paper reconstructs the key parts of the horizontal machine center, obtains the conceptual model of the key parts. Finally, the paper determines the impact of the size and the position of newly added reinforcing plate to the performance of the key parts in conceptual model. Taking the parameters that have higher sensitivity as the design variable, the paper carries out the optimized dimension design to the conceptual model. According to the result of the optimized dimension design, the conceptual model of the key parts of the horizontal machine center is reconstructed and optimized structures of the key parts are obtained. The analysis of the static and dynamic characteristics based on the optimized structures is carried out. Compared with the analysis based on the original structure, the effect of the structural optimization design is obtained.