It is reported that xi ‘an zhongke fine photon manufacturing technology co., ltd. has developed a series of ultra-fast laser pointer extreme manufacturing equipment, realizing the breakthrough of ultra-fine “cold processing” of air film holes in aero-engine turbine blades, filling the gap in China.
Aircraft engine manufacturing level represents a country’s science and technology, industry and national defense strength. However, the existing processing methods in China tend to lead to various manufacturing defects in the heavy parts of the aviation engine, which seriously affects the development and production of the new generation of aviation engine.
There are many small holes on the blade surface of aero-engine, which are called air film cooling holes, to solve the cooling problem of aero-engine under the harsh conditions such as ultra-high temperature (1700℃) and ultra-high pressure. Zhu jianhai, manager of microprecision science and technology development department of zhongke, said, “we use ultra-fast laser micromachining technology to break through the defects of recasting layer, microcrack and recrystallization that exist in the traditional manufacturing process of blade film holes.”
Femtosecond laser heat does not conduct, does not damage the material, energy too late to release the pulse has ended, to avoid the transfer of energy, the existence of heat conversion and thermal diffusion, the realization of the real sense of laser “cold” processing. That’s why it’s called “cold work.” A laser beam is “in motion” through various optical mirrors to precisely punch holes.
Compared with edm, long pulse and other processing methods, femtosecond laser processing does not change the material structure, does not produce phase transition, and has good surface integrity, which has become the best choice for ultra-fine and low damage in aviation, aerospace, electronics and other fields.