Gr4 titanium alloy is an ideal structural material for aerospace engineering because of its low density, high specific strength, good corrosion resistance and good process performance. In many aerospace applications, titanium and its alloys are replacing traditional aluminum alloys. Today, the aerospace industry consumes approximately 42% of the world's total production of titanium, and demand for titanium is expected to continue to grow at a double-digit rate between now and 2010. New generations of aircraft need to take full advantage of the performance offered by titanium alloys, and both the commercial and military aircraft markets are driving demand for titanium alloys. New models such as the Boeing 787, Airbus A380, F-22 Raptor, and F-35 Joint Strike Fighter (also known as the Lightning II) all utilize a large number of titanium alloys. Advantages of titanium alloy materials Titanium alloys have high strength, high fracture toughness, as well as good corrosion resistance and weldability. As the aircraft fuselage is increasingly using composite structures, the proportion of titanium-based materials used for the fuselage will also be increasing, because the combination of titanium and composite materials is far superior to aluminum alloys. For example, compared with aluminum alloys, titanium alloys can increase the life of fuselage structures by 60%.
Titanium alloys are generally considered to be difficult to machine because they are more difficult to machine than common alloy steels. The metal removal rate of a typical titanium alloy is only about 25% of that of most common steels or stainless steels, so machining a titanium alloy part takes about four times as long as machining a steel part. In order to meet the growing demand for titanium alloy machining in the aerospace manufacturing industry, manufacturers need to increase their production capacity and therefore need to better understand the effectiveness of titanium alloy machining strategies. Typical machining of titanium workpieces begins with forging and continues until 80% of the material has been removed to obtain the final part shape.
With the rapid growth of the aerospace component market, manufacturers have been overwhelmed, and the increased demand for machining titanium alloy workpieces due to less efficient machining has resulted in a significant strain on titanium alloy machining capacity. Some aerospace leaders have even publicly questioned whether existing machining capacity can handle all of the new titanium alloy workpieces. Since these workpieces are often made of new alloys, changes in machining methods and tool materials are required. The titanium alloy Ti-6Al-4V titanium alloy is available in three different structural forms: a titanium alloy, a-b titanium alloy and b titanium alloy. Commercially pure titanium and a-titanium alloys are not heat treatable but usually have good weldability; a-b-titanium alloys are heat treatable and most are also weldable; and b- and quasi-b-titanium alloys are fully heat treatable and are also generally weldable.
Titanium alloy parts processing in the machinery manufacturing industry occupies a very important position, titanium alloy material cutting processing has been the current processing technology difficulties. In order to meet the growing demand for titanium alloy workpieces for aerospace, China's titanium alloy cutting processing must make great progress. Based on the domestic conditions of materials, machine tools and management, further strengthening the optimization of titanium alloy material machining process routes, preferential selection of machining parameters, and improving the machining efficiency and product quality are important factors to promote the development of domestic titanium alloy industry and aerospace industry. The internal cavity cylindrical surface finishing boring tool designed in the paper has a simple structure and is easy to manufacture and use, which solves the machining process problems of the ball ring frame parts.
