Research On The Forming Mechanism Of Laser In-situ Assisted Diamond Impression

With the rapid development of modern industry,ultra-precision instruments and equipment are widely used in various fields,and the application range of micropores is becoming wider and wider,and the requirements for the quality of micropores are getting higher and higher.In response to the need for the use of micro-holes in the calibration samples of the ultrasonic side leakage instrument,proposing a micro-hole forming method for embossing.However,the existing imprinting processing technology has a work hardening phenomenon,causing micro-cracks on the edges of the micro-holes.This greatly reduces the service life of the calibration sample.In this regard,this paper proposes a method for forming micro-holes based on the laser in-situ assisted diamond conical indenter unidirectionally.The pure copper sheet is heated and softened,and the embossing process is carried out through the conical indenter to realize the forming and processing of ultra-micro holes.This method can not only meet the heating requirements of different working conditions,but also facilitate the control of the processing temperature,which can effectively improve the micro-holes.The processing quality can inhibit the initiation and expansion of micro-cracks at the edge of the micro-hole,and extend the service life of the calibration sample.The article first analyzes the thermal deformation mechanism of pure copper sheet.In the stamping process,the initiation and propagation of micro-cracks at the edge of the micro-hole are important factors to measure the quality of the hole.The dynamics of pure copper at different processing temperatures are analyzed from the perspective of microscopic grains.During the recrystallization process,the relationship between the grain size and the microcracks is established,and the appropriate processing temperature range is determined from the perspective of theoretical analysis according to the relationship between the two;the conical indenter used in the stamping process is an axicon,which is opposite to the light The transmission characteristics in the axicon are briefly analyzed.Based on the Comsol simulation software,the distribution of the electric field mode after the laser passes through the cone indenters with different cone angles is analyzed,so as to determine the cone indenter with the smallest laser energy loss,and according to the actual Design the conical indenter for laser in-situ assisted printing and press processing;analyze the energy transmission between the laser and the pure copper sheet to determine the absorption rate of the pure copper sheet for different wavelength lasers.Then perform finite element simulation analysis on the temperature field distribution of the pure copper workpiece under laser irradiation,analyze the temperature field distribution of the pure copper sheet under different laser powers,and according to the obtained simulation results,control the temperature by changing the laser power to assist the laser in situ The process of diamond embossing micro-holes is simulated,and the hole-forming moments at different temperatures and the height of the workpiece surface are analyzed for different substrates,and the Microstructure module in the DEFORM-3D finite element analysis software is used to analyze the crystal grains at different processing temperatures.Analyze the changes and summarize the evolution law of the crystal grains;use the advantages of laser in-situ assisted imprint processing to design four different processing plans,compare the processing effects of the four plans,and select the best processing plan,Lay the foundation for follow-up experimental research.Finally,on the basis of the original imprinting processing experimental device,it is improved to make it meet the requirements of laser in-situ assisted diamond imprinting processing,and the experimental plan is formulated.Through a large number of comparative experiments,the cone angle and blunt radius of the cone indenter,the base,the processing temperature,and the influence of different working conditions on the impression forming hole are determined,and the optimal processing parameters are summarized to verify the theoretical analysis and simulation of this paper The partial accuracy lays the foundation for the formation of laser in-situ assisted diamond imprinting micro-hole technology with independent intellectual property rights.