Research On Processing Technology Of Millisecond Laser Beam Machining Combined With Short Pulse Electrochemical Machining

With the rapid development of advanced technology, the size of micro structures isbecoming more smaller, which were widely used in the fields of aeronautics andastronautics, medical and electronic, automobile and shipping. New materials withexcellent properties are difficult to machine and need non-traditional micro-machiningto make micro structure. And it is hard to achieve high efficiency, good economy, highquality and precision meanwhile only depending on one of non-traditional machining.More than one technology is integrated and becomes a new method, which attractsmany scholars do a lot of research and is applied to the production. Lasermicro-machining has the advantages of high efficiency and good flexibility, andelectrochemical jet machining could achieve high quality, so making these methods tobe one which combines all the advantages will obtain great potential for developmentand application prospects.Based on foreign and domestic research, this thesis analyzes the technicalrequirements of the composite processing of millisecond laser beam machining andshort pulse electrochemical machining (LBM-SPEJM). Coupling system has beendeveloped for LBM-SPEJM, which is used in the research of the property of a focusedlaser beam transporting in the electrolyte jet, and then the process parameters of lasermachining for good quality has been acquired.According to the requirements of short pulse power supply for LBM-SPEJM, mainprocessing circuits, driver and protection circuits have been designed based on thetransistor type pulse power. The short pulse power is proven suitable for LBM-SPEJMthrough the experiments of short pulse electrochemical jet machining, and thenprocessing parameters have been obtained for LBM-SPEJM.Part of mechanism of LBM-SPEJM has been verified through the comparison testof water-jet guided laser machining and electrolyte-jet guided laser machining, namelythere are effects of thermal chemistry and photochemistry in LBM-SPEJM, which arehelpful for the improvement of processing quality. The subsequent processing for lasermachining with short pulse electrochemical jet machining is proven feasible in somesense, through relevant experiments. Orthogonal experiments of LBM-SPEJM drillingwith the developed coupling system and short pulse power supply have beenimplemented, and finally main influencing factors and optimal processing parameters ofLBM-SPEJM for reducing the taper of hole and the thickness of recast layer areobtained.