Theoretical And Experimental Studies On Hybrid Laser Percussion Drilling

Laser drilling technology has been widely used in industrial manufacturing because of its several advantages such as high processing efficiency,good quality,low cost and wide applicability.However,high-efficiency laser percussion drilling is generally completed by high-energy,high-peak power laser such as IPG's QCW series fiber lasers which is difficult to achieve with a relatively lower energy efficiency.In order to reduce the technical difficulty of laser drilling and improve the efficiency of energy,this thesis proposes a hybrid laser percussion drilling method using a modulated continuous laser and a high repetition rate,high peak power pulsed laser,in order to replace high-energy,high-peak power laser.A theoretical model of laser percussion drilling is established.It is proved that the modulated continuous laser and the high-repetition rate and high-peak power pulsed laser have a similar material removal rate with high peak power millisecond pulsed laser.It is pointed out that there is an optimal matching relationship between the modulated continuous laser and the high-peak power pulsed laser during hybrid laser percussion drilling.A hybrid laser percussion drilling system with modulated continuous laser and high repetition rate and high peak power was built.The laser material removal rate experiment was carried out on the 3mm-thick Q235 B steel.The results show that the hybrid modulated pulse with same energy has a relatively lower material removal rate than a single large energy and high peak power laser pulse.The best matching relationship between the modulated continuous laser and the high peak power pulsed laser train is verified experimentally.