Study On Machining Stability Of Titanium Alloy Thin-walled Components Considering The Flexibility Of Workpiece And Tool

Titanium alloys are extensively used in aerospace industry due to their excellent performance in aerospace environment. But the difficult-to-machine property of titanium alloy has been on important subject in the field of manufacture, especially for the thin-walled components. The thin-walled components are usually milled starting from a raw block of material, The material removal amount can reach95%and even98%. Due to weight requirements and the demand for higher strength, the many components used in the aerospace industry are usually thin-walled structures. manufactured parts are being designed with much thinner sections, which greatly reduces the parts’structural stiffness, problems such as dimension error and vibration are usually caused by the low stiffness and vibration. Under the influence of dynamic cutting force, chatter usually occurs in the machining process of thin-walled. Cutting vibration is one of the key problems which restricted the efficient machining of thin-walled titanium alloy components.Milling of titanium alloy thin-walled components is studied in this paper. A dynamic model of the titanium thin wall in milling is established by combination of theoretical analysis, finite element simulation and experimental method. The rigidity of tool and workpiece is considered and tool-workpiece displacement relations are analyzed in the model. The relative transfer function between the tool and workpiece is established. The impact of suspended deep on the tool dynamic characteristics is analyzed based on modal test. The impact of wall thickness as well as different locations on the dynamic characteristics of the titanium wall parts is analyzed. Cutting stability limit diagram considered tool rigidity and workpiece rigidity is drawn. The impact of milling speed on the cutting stability of titanium thin-walled part is studied through milling test. Finite element modal of modal analysis of titanium thin-walled part is established and the influence of wall thickness and machining step on the dynamic characteristics of the single frame part is analyzed. AdvantEdge Production Module software is used to establish process path model of titanium thin-walled based on milling stability and the impact of tool path on box type part is analyzed.