The Mechanism And Experimental Research Of Pulse Laser Dry Cleaning Tire Mold

In the domestic automobile tire manufacturing and usage industry,tire molds of rubber products are prone to be polluted,Conventional cleaning technologies are mechanical and dry ice cleaning which not only have low efficiency,high cost,but also poor environmental performance,and cannot meet the needs of modern production.In contrast,laser cleaning technology(LCT)is very popular in the industrial cleaning industry because of its advantages,such as environmental protection and high efficiency,This thesis takes tire mold as the research target,uses laser dry cleaning,and seeks the best process parameters for the purpose,The research’s route includes model building,simulation analysis,and experimental research which finally provides an effective laser cleaning process and online monitoring methods.Thesis work mainly has the following aspects:(1)Firstly,it discussed the cause analysis of the tire mold pollutants,calculated the different force forms of pollutants,established the model of laser dry cleaning ablation thermal expansion model.used ANSYS software to simulate the transient temperature distribution during laser cleaning of the tire mold explored the substrate surface heating law and obtained the maximum temperature fitting relationship at different energy densities.It calculated the single pulse cleaning threshold and damage threshold by combining the simulation data.The results are 1.95J/cm2 and 3.52J/cm2.(2)It built an automated laser cleaning prototype with a maximum average power of 200W and designed.an acoustic online monitoring system that could be used in the laser cleaning process.The monitoring system hardware integrates the acoustoelectric converter,signal amplifier,data acquisition card,etc.It used Lab VIEW software to perform waveform acquisition and FFT analysis on the plasma sound signal of the laser cleaning tire mold and determined the cleaning threshold and damage threshold through the sound wave monitoring experiment It is 2.0J/cm2 and 3.40J/cm2,which is within 5%of the calculated value of the model.(3)Finally,It adjusted different cleaning process parameters(the average laser power,scanning speed,and cleaning times)to carry out orthogonal experiments of tire mold cleaning.It used energy spectrometer(EDS),scanning electron microscope(SEM),roughness tester,hardness tester,electrochemical workstation,and other equipment to verify the optimal parameters of the cleaning effect.The best process parameters in the experiment of cleaning the tire mold are:laser average power 40W,scanning speed 1000mm/s,scanning times 5 times,this parameter meets the requirements of high cleaning rate,good surface appearance,almost no change in roughness and hardness,and Corrosion resistance are improved before comparison.Through the final experimental results,it can see the advantages of laser cleaning.In the future,laser cleaning technology is bound to play an increasingly important role in the mold industry.