| Aerospace technology constant progress has promoted the development ofmulti-performance composite materials. SiCp/Al composite material，which has wideapplication prospect as a new kind of composite material, has a lot of advantages suchas high specific strength, thermal conductivity and electrical conductivity, excellentshock resistance etc. But because of high hardness of silicon carbide (SiC) enhancedparticle in SiCp/Al composite materials it is hard to use the traditional machiningmethod. Not only the tool wear is serious and the cost is high, but the processingefficiency is also relatively low, which limits the application of SiCp/Al compositematerials.In order to solve the problem of difficult machining of SiCp/Al composites, specialnon-conventional method which is suitable for composite materials processing isurgently needed. Water-jet guided laser processing, as a kind of advanced micromachining technology, combined with the water jet and the advantages of bothtraditional laser processing. Traditional laser is kind of non-contact machining whichavoided machining tool wear and tear, at the same time because of the water coolingeffect in the processing, the processing quality has greatly improved. So this newprocessing can solve the problem of difficult machining of SiCp/Al composites.Therefore, in view of the SiCp/Al composite materials, water-jet guided laser micromachining method has great significance and application value.This paper firstly based on the existing traditional laser processing equipment anddesigned the coupling unit of laser and water-jet, building water-jet guided laserprocessing system successfully. The internal flow field fluid simulation analysis wassimulated by using FLUENT fluid simulation software, which validated the rationalityof the design of coupling unit. Through experiment, the coupling unit was able todeliver the flow of water to create water column optical fiber, and ensured the stabilityof the water column.Secondly, the related research has been carried on about the water-jet guided lasermicro machining method. A single pulse drilling and multiple pulse cutting machiningprocess simulation has been simulated by using ANSYS finite element software, and thethermal effect of the laser and the cooling effect of water-jet in the process of thesimulation has been considered at the same time, in order to study the distribution oftemperature field and material removal situation. In addition, the simulation model ofwater column punching material process during the water-jet guided laser pulse drillingprocess was established and studied the distribution of water pressure and speed in thecourse. The simulation of SiCp/Al composite materials was studied. Two kinds of finiteelement simulation model of SiCp/Al composite materials are built, which could be usedto analysis heat transfer simulation in the process of laser machining. Throughtheoretical analysis and simulation analysis, the mechanism of the SiCp/Al compositematerials removal process by the traditional water and laser guided laser processing wasunder study.Finally, according to the design of water-jet guided laser processing system, someexperiments were carried out. Drilling and cutting contrast experiment in differentmaterials by traditional laser and water-jet guided laser micro machining were carriedout, and some analyses were put forward simultaneously by using experiment data andprocessing quality was evaluated. At last application examples were showed for thesuperiority of the method. In addition through the analysis of the processing results ofSiCp/Al composite materials, the mechanism of the SiCp/Al composite materialsremoval process by the traditional water and laser guided laser processing was putforward. |
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