Modular Design And Dynamic Property Analysis Of Field Repairing Machine Tool

A great quantity of large even superlarge equipment undertake critical tasks in power, petrochemical, metallurgical industries.The main structure specifications of the equipment is great and the requirements of materials performance is rigor. It is difficult to machining and the quality index is high. To manufacture, transport, installation is hard. It is very expensive, The damageable parts of it can be repaired in the work field regular. According to the characteristics of the technology of field repairing, the entire distribution, the tragbarkeit, the modular design procedures of the rapid disassembling and the precise assembly, and the major factor, which impact dynamic performance of site repair machine and other element has been researched.The technique aporia is been researched and solved in the dissertation as flowing:(1) The materials of large equipment usually are difficult-to-machine, so the machine tool must provide enough power. The response of excitation which caused by cutting would influence the repair quality. Draw a conclusion form the machine working conditions of repairing the damaged area of large-sized equipment, that by increasing the structure size can not meet the machine requirements of stiffness of especially the dynamic stiffness. To ensure the repair quality in the limited conditions of the total weight and the dynamic characteristic of machine by big incentive effect, is a technical difficulties of large equipment repaired.(2) The repair parts of large equipment have various structures, so it requires modularzation of the machine tool which used for repairing. With the combination of different functions,the machine tool can easily and quickly repair different types of surface. Because of the limited of transportation conditions,the machine tool should be decomposed some functional modules so that it can be transported into the repair site to complete the repair task. Therefore, the modular design based on the rational functional decomposition and combination is a technical problems to be solved in repairing of large equipment.(3) To meet the need of modularzation, it should be set necessary standard interfaces for each module in order to achieve the rapid decomposition and assembly of machine tools. However, the interfaces set increase the number of joint surface, i.e. increase load transfer levels compared to conventional machine tools, reduced the stiffness of machine tool. The impact of dynamic characteristics of joint surface to those of complete machine tool is far greater than the impact to conventional machine tools, it has become another major technical difficulties of large equipment repairing.By applying the proposed design method which derived from generalized modularzation, the structure module of the machine tool was confirmed; applying mechanical system dynamics and finite element techniques, the dynamical characteristics of the key components of the machine tool was analyzed, and the improved structure was proposed. The thesis also analyzes the dynamic characteristics of joint surfaces, discuss the parameters identification method of the joint surfaces.Main achievements are as follows:(1) Analysis on the structure characteristics of repair parts of large equipments and the characteristics of harsh working environment of machine tool, find the technical difficulties of large equipment repairing.(2) Aim at the technical difficulties of large equipment repairing, by the application of module design idea, the module derived method was proposed "modular design based on functional requirements", the standard module interface was set, the overall restoration plan was developed according to this method and was applied successfully in the trials. The modular design methodology was complemented, it has solved the technical problems such as the delivery and working in a narrow channel or space of machine tool, repair structure and desired functional diversity.(3) Aim at the constraint conditions such as no basis, structure size and restricted total weight of the on-site repair machine tools, the dynamic characteristics of main functional modules of machine tool was analysed, the improved scheme was improved and the dynamic characteristics of the key parts after improvement such as the rails, beams and columns of the machine tool were analysed, the results show that the machine performance was improve.(4) Aim at the influence that inevitable increase joint surfaces to the dynamic characteristics of machine tools caused by modular design, the dynamic characteristics of the joint surface of machine tool were analysed, the parameter identification method of the joint surface was discussed.The thesis take the working characteristics of repair machine tool as the background, discuss and improve the modular design methodology. The overall design project of machine tool for repairing was studied out based on functional analysis, the dynamic characteristics of main mechanical structures of machine tool were analysed, the weak links were found, the programs of structure were improved, the performances of machine tool were improved, and the dynamic characteristics in terms of joint surfaces were discussed. To further improve the performance and promote the research and development level of on-site machine tool for repairing, the research of the project have very important theoretical and practical significance.