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Ceramic cutting tools in machining of aircraft parts
The ceramic material is the 21 th century, the material of the tool The most promising and competitive, and the probable cause of a revolution in the field of machining. While we try to get some experience in the process, but requires further testing to expand the variety of materials processing, which dominate the performance of ceramic cutting tools can be better applied to the treatment alloy at high temperature.
In aero-engine industry, properties of materials to rise, difficult to process materials (high temperature alloys) CNC machining technology has become the industry's problems of interest common. The material of the ceramic tool has high hardness, wear resistance and good heat resistance, stability Chemical, excellent, easy metal junction characteristics after high temperature alloys has become a material of high cutting speed tool, the main one. And the best tool carbide ceramic cutting tools has increased the speed of 8 to 10 times, can significantly improve cutting efficiency. Currently, new ceramic cutting tools emerging, some experts have predicted that the global cutting tools manufacturing tools ceramic in the proportion of 15% to 20%. Its development is likely to cause a revolution in the field of machining.
Top alloys refractory (mainly nickel or cobalt-based alloys) at elevated temperatures with excellent stability and creep cons hardness GH4169 high temperature (up to HRC35 ~ 47), good toughness. However, in comparison with unalloyed, its performance is poor machine cutting process needs to consume more energy.
At the beginning of the 21st century, our society has begun to acquire a large number of numerical control equipment, phasing of common machine tools, carbide cutting tools in removable gradually replace traditional welding tools, an unprecedented increase in production efficiency.
Over the past 10 years, the application tools made from carbide, titanium, nickel and mass base superalloy cobalt alloy materials in the hard work of less than 600 ℃ temperature indicated by high hardness and great toughness to make a cut of high temperature alloys and titanium alloys ideal. However, carbide tools cutting have a fatal weakness, its melting point is about 1200 ℃, when the temperature of the cutting area is above 800 ℃, the slides a significant decrease in the strength and hardness, wear increased, and even more difficult to meet the normal court. Therefore, the application materials at high temperature alloy carbide cutting tools, in order to prevent the temperature of the cutting area is too high, speed line can be maintained only at around 40m/min. Most of the machining allowance, due to the slow section, the removal rate metal is very low, which is Time Machine is too long, costs of production has increased dramatically, making the potential of modern tools CNC machine is far from reality. With the new engine performance, continuous improvement, new materials are constantly emerging, carbide cutting tools has been difficult to adapt. Therefore, finding a more ideal for cutting tools has become essential.
engine in developed countries (USA, GE, United Kingdom Rolls-Royce Corporation) as early as 20 years ago have begun to adopt alloys high temperature, ceramic tools. Ceramic is the largest property of high melting point (2000 ℃ and over), 1200 ℃, which hardness does not fall far is an ideal replacement carbide cutting tool material for high cutting speed. In China, for various reasons, the use of these tools is not yet available.
Chip formation in machining is a process typical of large deformation, involving the non-linearity material nonlinearity and geometric non-linear boundary value problems in the process of high-speed cutting involves the question of the thermocouple. About the Author
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