Laser Cold Processing Spectrum Detection Method And Application

Laser cold processing means that under ultra-fast frequency laser pulses,the time that it acts on the workpiece material is extremely short,which causes the heat during the vaporization process to be too late to conduct to the periphery of the material and cause thermal effects.Therefore,the use of femtosecond lasers is considered in industrial processing.Cold working.For the detection of laser cold processing spectra,qualitative or quantitative analysis of element information can be performed by detecting the wavelength and energy intensity of the spectrum.At the same time,the spectral intensity information can be used for hole penetration detection in hole processing.Using the spectral information in the laser cold processing process to realize hole penetration judgment and metal element analysis,the paper analyzes the principle of laser cold drilling and the characteristics of laser induced breakdown spectroscopy(LIBS),and designs the laser spectrum detection of laser cold processing.The system,relying on the MicroDrill 100 five-axis femtosecond laser micromachining equipment of Xi'an Institute of Optics and Mechanics,Chinese Academy of Sciences,builds and completes the spectrum acquisition system,and the experimental parameters when the optimal spectrum energy is determined through experiments are laser energy 32W,focusing distance 150mm,laser The rotary cutting speed is 2400r/min,and the protective gas is compressed air.Under these experimental conditions,a hole penetration experiment was carried out on stainless steel 304 steel plate,the characteristic spectrum line was monitored in real time by a spectrometer,and the data was processed by the computer.When the hole penetrates,the spectral energy will also be significantly reduced.Through the beating of the collected spectral energy during the hole penetration process,it is possible to judge whether the hole processed by the laser penetrates.The experiment verifies that the LIBS method can be used.The penetration of the hole judges the feasibility.The internal standard single-spectrum method and multi-spectrum intensity quantitative analysis method were used to analyze the composition content of the trace elements manganese(Mn)and nickel(Ni)in the experimentally processed metal materials.The determination of the different elements was calculated by the ratio of the spectral intensities.Standardize the fitting curve,calculate and obtain the actual metal content.The experimental results show that by analyzing the four optimized experimental conditions,both the internal standard single-spectrum method and the internal standard multi-spectrum method can realize the element content analysis of metal materials,and the method of summing the intensities of multiple spectra can be more effective.Reduce the error caused by the analysis and improve the accuracy of the internal standard method.The research results can provide technical ideas and methods for real-time hole processing and material element analysis in the laser cold processing process,and have good application value.