The design, materials and manufacturing technologies of aviation products complement each other and promote each other and restrict each other. The renewal of a generation of aircraft and its engines is accompanied by major breakthroughs in new materials, new structures and new processes. The replacement of thermal processing technology will certainly promote major changes in the performance and structure of aerospace products.
Thermal processing technology is an important part of the main technology of advanced manufacturing technology and is the basic technology to ensure the quality of aviation products. The role in the aviation industry can be summarized as follows:
(1) Significantly improve the performance of aviation products. Over the past 30 years, the turbine inlet temperature has increased by 450 ° C, 70% of which was achieved with the use of cast hollow vanes, which have become the key technology to determine the highest performance level of the engine.
(2) Significantly reduce the weight of aviation products and reduce manufacturing costs. Many examples at home and abroad have proven that the use of advanced thermal processing technology to manufacture large precision forgings and castings can reduce weight by 20% and reduce costs by about 30%. At the same time, it provides designers with design flexibility.
(3) Improve the service life and reliability of aviation products. For example, the use of multi-directional die forging, vacuum heat treatment, surface cadmium-plated titanium and shot peening and hole extrusion strengthening treatment and other advanced thermal processes to manufacture landing gear parts can make the landing gear and the aircraft the same life, one landing gear can replace the traditional production process Several landing gears are used.
At present, foreign countries have been able to mass-produce leaf precision forgings and oriented and single-crystal alloy hollow blade precision castings of various sizes without any margin. The United States Howmet Company has produced more than 100 kinds of more than 100 million pieces of precision cast single crystal blades; Large-scale die forgings of various materials with a projected area of ​​1.2-3.5 m2 have been mass-produced, and titanium alloy die forgings with a projected area of ​​5.16 m2 have been successfully developed; mass production of 1300 mm and wall thickness of 1-2 mm (thinest 0.5 mm) have been mass-produced. Titanium alloy casting machine, and is developing precision castings up to 2000mm in size.
China has been able to produce small and medium-sized titanium alloy blade precision forgings and oriented hollow blade precision castings in small batches, and has successfully developed single crystal alloy blade precision castings; titanium alloy casing castings with a diameter of 570 mm and die forgings with a projected area of ​​less than 1 m2 have been developed. . This situation is not only far from the international advanced level, but also compared with the demand for thermal processing technology in the development and production of advanced fighter aircraft, advanced civil aircraft and high-ratio engine and airborne equipment in the new century. Very big. Therefore, it is necessary to formulate plans, clarify goals, and concentrate on overcoming the key thermal processing technologies that are urgently needed for the development and production of new machines. In view of this situation, this paper looks forward to the key technologies of China's aviation thermal processing in the new century.
1 thermal processing technology development trend of modern thermal processing technology <br> <br> various process methods are mostly integrated technology combines many disciplines in one, is compatible with a variety of engineering and technical theory of modern science and technology, is the most technologically intensive, One of the most high-tech fields that represent the level of advanced manufacturing technology, characterized by technical difficulties, high cost, and long research cycles, is developing along the following new trends:
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