Tool Axis Orientation Planning Method of Fixed Axis in Each Cutting Line for Closed Blisk Tunnel Five-axis Machining

The closed blisk of an aeroengine plays a key part in the improvement of the thrust-to-weight ratio of the new generation aeroengine,and its tunnel structure is a typical complex tunnel structure with multi-constraints.This paper proposes a new tool axis orientation planning method based on the fixed axis in each cutting line machining for closed blisk tunnel finish machining.The basic concept of the method is discussed from the machining principle,and the five-axis machining features of the closed blisk tunnel are analyzed.The calculation method of the tool axis orientation interference free domain is given based on predefining the tool and establishing the bounding sphere hierarchy tree structure of the check surface.The division of the blisk tunnel machining region is made based on the calculation and analysis of the shortest tool length of cutter location points,and the tool axis orientation planning method of fixed axis in each cutting line machining is established.Experimental results demonstrate that,compared with the five-axis linkage machining method,the fixed axis in each cutting line not only significantly improves the stability of machining and the quality of the machined blade surface,but also improves the blade finish machining efficiency.