A novel surface self-adapting parallel machine tool for blade machining

The finish machining of blade is very difficult because of its very complicated free-form surface. To improve the machining efficiency and quality of blade, a novel machine tool with parallel robotic mechanism is designed to meet the demand for finish machining of blade. At first, the structure of the designed machine tool is introduced and its kinematics analysis is deduced. Moreover, based on the measured data from three-dimensional measuring machine, the impeller blade model is constructed. A group of section profiles are selected and as a numerical example, one of them is fitted with a polynomial function, furthermore, the curvature of the selected profile is analyzed. In addition, the machining movement is programmed, which provides available information for the parameter design of machine tool. From the analytical results, it is proved that the proposed novel configuration of machine tool is feasible to machine free-form surface blades.