Study On The Wear Mechanism And Characteristics Of Carbide Tool In High-speedmilling With Titanium Alloy

The titanium alloys, with their characteristics that high specific strength, light quality, good low temperature performance and corrosion resistance, have been widely used in aerospace, petrochemical and other fields. However, TC4 alloys are considered as the typical difficult-to-cut materials due to their high thermal strength, low elastic modulus, low thermal conductivity, seriously cold welding phenomenon and high chemical reactivity. The application of titanium alloys are largely restricted because of the serious tool wear and the low machining efficiency. At present, the high speed milling has been applied to the processing of titanium alloys. Compared with the traditional cutting speed, high speed cutting has improved the efficiency in the processing much more, but there are still many problems to be solved in the actual processing, and the tool wear is one of the most important. The cemented carbide is commonly used for the tool material in cutting the titanium alloys. Our subject, by choosing different grades of the cutting tools, studies the tool wear when cutting the titanium alloy in high speed milling. And the tool cutting tests are carried out, under the condition of different milling method, different cooling methods, different tool materials and different milling parameters. It also analysis the wear morphology, the wear mechanism and the influence of tool life in different cutting conditions.Through the use of different grades carbide tools cut titanium alloys in high speed milling, we know that the wear mechanism of the carbide tools is adhesive wear and oxidation wear. The main wear morphology of rake face is collapse, spilling and chipping; and the flank face is groove wear, micro-tipping and tipping. The tests, in the contraction of the three different milling methods, found that down milling has better tool life than up milling and alternate milling; Compared the two kinds of cooling ways, the dry cutting and the cutting fluid, we know that dry cutting has better tool life than cutting fluid; Comparative study on several main parameters, we know that the milling speed has the biggest effection tool life, the cutting depth has less influence than the milling speed, and the effect of feed per tooth is the least in the three; the comparison of the three kinds of cutting tool materials,we know that S30 T and H13 A have better tool life than YBG202.