Process in laser drilling of deep microholes without taper on metal materials

Deep microhole machining is currently a prominent research area within the aerospace field, encompassing blade film cooling and fuel injection control technologies. However, taper defects in metal materials may lead to performance degradation or even structural damage over a component’s lifetime. Trepanning and helical drilling, facilitated by ultrashort pulse lasers, have proven more suitable for achieving high-precision, deep holes in metal materials. Nonetheless, excessive repetition rates can also result in severe thermal damage. Various methods are commonly employed for controlling taper, including parameter optimization, assistance, and secondary modification. Tilted laser beam drilling is widely utilized and has been integrated into relevant machining systems for commercial applications. Typical deep microholes include film cooling holes and injection microholes. Laser drilling is a potential machining method for new materials in the aerospace field. Although laser drilling processing has been studied, numerous related scientific challenges and technical difficulties must be addressed before practical implementation.