The Numerical Simulation And Experimental Study On Micro-hole Drilling Of Superalloy Based On The Orthogonal Experiment

Compared with the traditional way of drilling,laser drilling has been widely used in industrial applications because of its unique advantages.It shows an irreplaceable role and unique advantages,such as high precision,high accuracy,versatility,high efficiency,stability and reliability,and comprehensive benefits.Laser drilling has become one of the key technologies in the field of micro-hole machining.In this paper,the method of numerical simulation and experiment is applied to study the laser drilling.The finite element software is used to simulate the laser drilling process,so as to provide references for the selection of subsequent experimental parameters.The effect of laser drilling parameters on the quality of laser drilling is mainly studied by orthogonal experiment,and the process parameters are optimized.Firstly,this paper briefly introduces the laser drilling technology,the advantages of laser drilling,the current research status and development trend at home and abroad.At the same time,this paper studies the mechanism of laser and metal material,analyzes the removal process of laser drilling material,and introduces the existing laser drilling methods and laser drilling equipment.In the simulation part,this paper introduces the basic theory of finite element and the ANSYS analysis software,mainly introduces the thermal analysis of ANSYS.The finite element model of laser drilling is established by using APDL language.The different pulse number of the laser drilling temperature field distribution are analyzed.The element life and death method is used to simulate the microporous profile under different number of pulses,which provides guidance for the experimental research.In the experimental part,the high-temperature alloy GH4037 is selected and the relevant laser drilling test is carried out.The orthogonal process is used to optimize th e laser drilling process parameters,and the process parameters for obtaining small hol es and small taper holes are obtained.The relationship between laser drilling process parameters(impulse energy,defocus amount,pulse width,repetition frequency,beam expansion ratio and assist gas pressure)and hole diamater,morphology and quality of laser drilling was studied.The analysis of the orthogonal test results is performed using range analysis to obtain optimized process parameters.The optimal combination of process parameters for obtaining smaller upper and lower apertures and pinhole taper is: pulse energy 1 J,beam expansion ratio 3.5,pulse width 1 ms,repetition frequency 60 Hz,defocus amount + 1.0 mm,auxiliary gas pressure 3.5 Bar.