Turbine Blade Cnc Abrasive Belt Grinding Machine Structure Design And Analysis

Blade is seen as a key part of the steam turbine. The performance and efficiency of steam turbine depend on the machining quality of blade surface. In China, the last procedure of the blade grinding is mostly progressed by handcraft at present, which has the lower precision and efficiency. Therefore, it's needed urgently for domestic blade manufacturing enterprises to develop a sort of final processing equipment for blade, which have the high precision and efficiency. It is also an urgent requirement to improve our present manufacturing process level of turbine blades for our country.In the light of the difficultly machining of the turbine blade surface, this paper applied the modern CNC technology and the highly efficient abrasive belt grinding technology to conduct the structural design and analysis of six-axis CNC abrasive belt grinding machine for turbine blade. The main work of the research include the following aspects.Firstly, based on the features of the shape of the turbine blades and the characteristics of abrasive belt grinding, the shaping theoretics of belt grinding and the processing of belt grinding motion on blades was analyzed. The basic movement of the belt grinding for blade was defined, and the number of motion control axes of the belt grinding machine was determined.On the basis of the above analysis, the structural type and configuration of the machine tool were discussed. The structural and functional parameters of the grinding machine were established. Then the overall structure of the machine tool was designed, and the main structural components of the grinding machine such as the foundation of machine tool, drive shaft parts and the grinding system components were designed in detail. In the designed structure of machine tool, the two swing axes and the tool axis were orthogonal in space. It can enhance the control accuracy of tool swing and reduce the difficulty of CNC programming for blade grinding. The grinding pressure control device of the machine can make the grinding pressure invariably. Therefore, the difficult problem of high-precision control for belt grinding can be solved.After the structural design completed, the kinematic simulation test of the grinding machine was progressed by using the Pro/Mechanism module which embedded in the Pro/E software. The possible interference of machine were checked, and the movement parameters can also be measured and analyzed. So the rationality of the motion mechanism of the grinding machine were analyzed and verified globally and systematically.Finally, by the use of the finite element analysis software-ANSYS, the key parts of grinding machine were analysed through static analysis in condition of two typical phase in this paper. According to the result of analysis, the structure of the machine parts were improved and adjusted to ensure the static strength and stiffness. Then the modal analysis of the improved machine bed and column were carried out in order to verify the dynamic characteristics of the machine. As a result, the reliability of the whole designed structure for the machine tool can be guaranteed.