Titanium is encountered on many occasions in our lives. In the field of medicine, titanium has become indispensable for joints and dental implants; in the aerospace sector, the components carried are made of titanium. Titanium alloy has the same strength as steel, but its weight is only half that of steel, and it has excellent elasticity and will not become brittle at low temperatures. However, titanium alloys exhibit certain defects during cutting operations, which can result in increased processing and tooling costs. Titanium is a very poorly conductive conductor with a factor of 10 compared to steel. During the cutting process, 75% of the heat generated by the machining is transmitted to the tool without being removed with the chips. In order to solve this problem, it is necessary to use a highly heat-resistant hard metal material and take effective cooling measures during processing. This will result in the use of a large amount of coolant, preferably directly through the spindle to the cutting face under high pressure conditions. Therefore, for titanium alloy cutting operations, load-bearing tools with internal cooling have become the preferred product. Another result of this poor thermal conductivity of titanium alloys is the high temperatures generated on the cutting tool. It produces chemical reactions such as oxidation and diffusion of the blade surface. Through a large amount of cold deformation, titanium tends to be hardened, its tensile strength is tripled, and the breaking force can be reduced by up to 90%. The tendency to harden causes significant resistance to the cutting process: the cutting edges are prone to breakage or the cutting material is damaged. The sharp cutting edge can reduce the cutting force, so that a certain compensation can be achieved, but this measure can not be excessive, otherwise the cutting edge will become too weak. Many of the components used in the aerospace industry are forged titanium parts. The surface hardness of these parts is not uniform, so the degree of loading is unpredictable for indexing inserts. Ceratizit has a special high temperature resistant coating compound called Hyper-Coat that solves this problem well. Behind it is a layer of ISO P and M35 hard metal materials and a coating specifically designed for this application. This new type of hard metal is called CTP5240. This material is a heat-resistant medium-grain hard metal material that combines high wear resistance, sufficient flexibility and high heat resistance. The coating significantly weakens the chemical reaction tendency of the workpiece material such as oxidative diffusion, and has excellent friction characteristics, is stable by heat, and has high hardness. At the same time, this coating also produces an effective thermal protection layer that protects hard metal materials from premature wear at higher cutting speeds. In addition, the coating material has been specially surface treated to achieve an extremely smooth cutting surface, which greatly reduces the coefficient of friction during the cutting process. In the shape of the CTP5240 blade, Ceratizit achieved a high-sharp design. This geometry allows for good cutting results with low cutting forces and low cutting pressures. Therefore, the processing temperature can be maintained between 200 and 250 ° C for a long time. Another feature of the insert is that it also has a good cutting shape and effective chip drainage. With a good cutting shape, this geometry helps efficient chip evacuation because the amount of chips is always kept at a very low level. Due to the combination of geometry and material variety, a cutting speed of 120 m/min, a feed of 0.12 mm and an axial depth of cut of 6 mm can be achieved during roughing. Introduction to milling cutters for titanium machining
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