Study On The Wear Mechanism Of Cemented Carbide Tool In Axial Turn-milling TC4 Titanium Alloy

The titanium alloy is widely used in the field of aerospace industry because of its excellent combination property, such as high specific strength 、 high corrosion resistance and high temperature resistance.However, due to the titanium alloy’s characteristics with the small elastic modulus、the poor thermal conductivity、the high chemical reactivity and the serious cold-hardening, it is easy to generate continuous chip in the traditional turning, leading to tool wear which has quite effect on efficiency of turning titanium alloy. In order to solve the above problems to achieve the gold of high efficiency、high precision、high reliability、low costs. The paper put forward a new way that adopting the processing technology of the axis turning-milling to cut titanium alloy, and depth research of the wear mechanisms of tool.The paper analyze that the cutting condition、cutting way、cutting parameter、the coating of cutting tool effect on tool’s wear morphology through experiment of cutting TC4 titanium alloy inner bore by axial turn-milling, reveal the influence of the cutting conditions, cutting way, cutting parameters, tool coating on the tool life and wear mechanism.The experimental results show that the main wear morphology of S30 t fine grain cemented carbide with coating is previously flank crater wear, spalling wear, tool tip breakage and grooving wear, The main wear mechanism of carbide cutting tool show adhesive wear,oxidation wear,diffusive wear and abrasive wear, but adhesive wear is the main mode in the process of high-speed axis turn-milling TC4 titanium alloy. Under the same cutting condition, for the tool wear, the effect of cutting speed is the biggest, next is the axial feeding, and the minimal is feeding amount of per tooth. Tool wear is more serious under the condition of coolant than under the condition of dry in the process of high-speed axis turn-milling TC4 titanium alloy. In the reverse-cut process of cylindrical and inner hole, to prevent chip from squeezed in workpiece, leading to processing quality become bad, we should select the right relative positionof workpiece and tool. The result prove that Cutting tools should be placed on the workpiece side or bottom in the process of axis turn-milling cylindrical, and cutting tool should be placed on the upper part of in the process of axis turn-milling inner hole.