Research On The Laser Drilling Of High Quality

Laser drilling is one of the most important and wide-used method of the recent laser processing.In the recent years, with the raise of the microhole processing quality,all kinds of traditional microhole processing method can't meet the need of the depth-diameter ratio.As laser drilling can do it,it is already the most attentive processing method.This paper introduces all kinds of drilling method, advantage and disadvantage, the superiority of the laser drilling and the laser drilling system. Because pulse laser drilling have high efficient, low cost, high synthetical economic, therefore it has been applied on the aviation and spaceflight's industry,and so on.This paper firstly explains the interaction machanism of laser and material, lays great emphasis on the interaction regular pattern of the metal and laser, and introduces several of drilling methods'traits. Based on certain theoretical analysis and toward thick recast layers and flaw'problem in laser drilling, adopting high power and high quantity laser carry experimental research. This laser poss characteristic:①T he output power attains 500w;②Laser energy instability less than 2%;③Laser radiation angle: about 3.5mrad.Design a sort of new-style laser cutting head, using this equipment can carry out trepanning and percussion drilling processing.This paper introduced the laser processing on high-temperature alloy and soft steel of different laser parameters, and studied the effect of laser parameters and assistant gas through the experiment .And the trepanning of no-modulation pulse was introduced, obtained the little taper and few recast.Then introduced laser drilling of the high peak pulse, found the advantage of modulation.And studied the laser drilling of nearby the last energy threshold. Accoding to experiment, found that trepanning can obtain the holes of little taper, high roundness, using laser drilling of nearby the last energy threshold gained the holes of high quality.