Titanium alloy has the advantages of low density, high specific strength, good corrosion resistance, good process performance, etc. It is an ideal aerospace engineering structural material. In many aerospace applications, titanium and its alloys are replacing traditional aluminum alloys. Today, titanium materials consumed by the aerospace industry account for about 42% of global production, and from now to 2010, the demand for titanium materials is expected to continue to grow at a double-digit rate. The new generation of aircraft needs to take full advantage of the performance provided by titanium alloys. Both the commercial and military aircraft markets are driving the demand for titanium alloys. New models such as the Boeing 787, Airbus A380, F-22 Raptor fighter, and F-35 Joint Attack Fighter (also known as Lightning II) all use a large amount of titanium alloy materials. Advantages of titanium alloy materials Titanium alloys have high strength, high fracture toughness and good corrosion resistance and weldability. As aircraft fuselages increasingly use composite materials, the proportion of titanium-based materials used in the fuselage will also increase, because the combination of titanium and composite materials is far superior to aluminum alloys. For example: compared with aluminum alloy, titanium alloy can increase the life of the fuselage structure by 60%.
Because titanium alloys are more difficult to process than ordinary alloy steels, titanium alloys are generally considered to be difficult to machine materials. The metal removal rate of a typical titanium alloy is only about 25% of most ordinary steel or stainless steel, so it takes about 4 times longer to machining titanium alloy workpiece. In order to meet the growing demand for titanium alloy machining in the aerospace industry, manufacturers need to increase production capacity, and therefore need to better understand the effectiveness of titanium alloy machining strategies. The machining of a typical titanium alloy workpiece begins with forging until 80% of the material is removed to obtain the final workpiece shape.
With the rapid growth of the aerospace parts market, manufacturers have felt powerless, coupled with the increased machining demand due to the lower machining efficiency of titanium alloy workpieces, the titanium alloy machining capacity is clearly in a state of tension. Some leading companies in the aerospace manufacturing industry even openly questioned whether the existing machining capabilities can complete the machining of all new titanium alloy workpieces. Since these workpieces are usually made of new alloys, it is necessary to change the machining methods and tool materials. Titanium alloy Ti-6Al-4V titanium alloy has three different structural forms: a titanium alloy, a-b titanium alloy and b titanium alloy. Commercial pure titanium and a titanium alloys cannot be heat-treated, but usually have good weldability; ab titanium alloys can be heat-treated, and most are also weldable; b and quasi-b titanium alloys can be fully heat-treated, and generally also have Weldability.
The machining of titanium alloy parts occupies a very important position in the machinery manufacturing industry. The cutting of titanium alloy materials has always been the difficulty of current machining technology. In order to meet the growing demand for titanium alloy workpieces in aerospace, China’s titanium alloy cutting process must make great progress. On the basis of domestic materials, machine tools, management and other conditions, further strengthening the optimization of titanium alloy material machining route, optimization of machining parameters, improving machining efficiency and product quality are important to promote the development of domestic titanium alloy industry and aerospace industry factor. The internal cavity cylindrical surface finishing boring cutter designed in this article has a simple structure and is very convenient to manufacture and use. It solves the problem of the machining technology of spherical ring frame parts.
