Research On Laser Processing Technology And Optimization Of Traditional Ceramics

Today,there are more and more traditional ceramic applications,it puts forward higher requirements on the dimensional accuracy of traditional ceramic processing.And ceramics as a high hardness,high brittle material in the external force sensitivity,the surface stress generated by the mechanical processing method is large,the damage to the ceramic surface is larger,the waste rate is high,and the sintering ceramic cost is high,therefore,it is difficult to achieve high efficiency processing.Laser processing,as an advanced manufacturing technology with no contact,high speed and high precision,provides an ideal and effective processing method for the processing of traditional ceramics.In recent years,the research of laser processing of ceramic materials mainly focuses on laser drilling with high depth ratio and laser milling surface quality control.The ceramic materials studied are mainly engineering ceramics.The research of laser processing experiments and theories in the field of traditional ceramics is at the basic stage.Based on traditional ceramic materials,based on pulsed CO₂ lasers as processing platforms,this paper begins with the research of basic theory and combines experiments and data analysis to carry out the following work:1.The theory of the propagation of light is used to make a macro description of the transmission and absorption process of laser in ceramic materials.Under the premise of analyzing only the photo thermal effect of the laser,the heating and vaporization process of ceramic is studied by theoretical analysis,the one-sided melt jet removal model of ceramic is established,in combination with the experiment,the processing threshold value of the carbon dioxide pulse laser of the ceramic material used is 13.74 J / cm².2.The dynamic simulation of the temperature field of ceramic laser processing process is established by using the APDL language of ANSYS,and the relationship between the temperature field and the three process parameters is explored.It is found that the maximum temperature of the spot center changes in a single trend as the power and scanning speed increase.But as the repetition frequency increases,it decreases first and then increases,and the variation range is within a few tens of degrees.3.The experiment was designed using the single-factor control variable method,the relationship between the process parameters and the processing depth was studied through data,and the evaluation criteria for the processing depth and processing width of the single-layer single-pass ceramic laser processing were established.4.The response surface method was used to design a dual-target optimization model for three laser process parameters,and the evaluation index established in this paper was used as the optimization target.The data analysis showed that the optimal process parameter combination for ceramic laser processing was laser power 23.5 W and scanning speed.2.5mm / s,repetition frequency 2 KHz,under the combination of the process parameters,the ceramic processing depth is 0.32 mm and the processing width is 0.85 mm.5.Based on the experimental data,the MATLAB language was used to establish the BP neural network prediction model of the width and depth of the pulsed carbon dioxide laser processing of traditional ceramic materials,and the successful prediction of the processing morphology within the average absolute error of 0.025 mm was achieved.