五轴测量复杂曲面粗糙度及其无干涉方法

The surface quality of aerospace complex parts directly affects the performance and service life of aero engines. Surface roughness as one of the important parameters to measure the surface quality, its detection method is very critical. Aiming at the difficult problem of roughness measurement of aeronautical complex parts, the roughness measurement of complex curved surface was studied by using the five-axis measuring machine, which had high flexibility and wide reachability. The relationship between roughness sensor and workpiece position was analyzed. The interference check method between sensor and workpiece was studied, and the non-interference orientation of stylus in five axis roughness measurement was solved, so as to predict the measurable area of roughness. The feasibility and accuracy of the model were verified through the roughness inspection experiments of the key parts of the centrifugal impeller. The results showed that the complex surface roughness detection based on five-axis measuring machine was a feasible detection method. The interference-free algorithm could accurately predict the measurable area, which made it possible to quantify the roughness of the key parts of complex parts, while the detection efficiency was greatly improved.