Abstract: [Objective] This study investigated the wood processing technology by nanosecond water guide laser. The influence of processing direction, processing speed, output power, processing depth and thermal degradation on processing quality were discussed, the relationship between the influencing factors that lead to the optimal processing by nanosecond water guide laser were obtained, and the feasibility of the processing technology was demonstrated.[Method] On the basis of investigation, analysis and research on the processing technology and principle of existing laser technology, a test bench that wood can be processed by nanosecond water guide laser was designed and manufactured. In this paper, the general layout principle, the experimental method and the main functions of the main components are introduced, and the main components-the transmission test bench and function of the nanosecond laser NC machining are described in detail. And the basic principle and microscopic phenomenon of the wood processed by nanosecond water guide laser are analyzed and studied. During the wood processed by nanosecond water guide lasler, the phenomenon that produced near each processing line was recorded. After processing, the processing depth of each line was measured. To draw the graph of relationship between processing speed and processing depth in texture direction, graph of relationship between processing speed and processing depth in vertical texture direction and graph of relationship between output power and processing depth.[Result] Through the analysis of the experimental data, when output power is certain, the processing depth decreases in hyperbolic curve with the increase of processing speed. When the processing speed is certain, the processing depth increases with the increase of the output power, when the output power is higher, processing depth will not increase with the increase of the output power but show a gradually decreasing trend. During the process of processing, the charring phenomenon may produce, and the charring degree will increase with the increase of processing speed and the decrease of processing depth. In the process when the wood materials are different, the processing result will also exist differences, the processing effect of hard wood is relatively better than that of soft wood, the charring degree is relatively lower, the processing depth is relatively shorter, the processing curve is roughly the same, and a certain difference in the curvature exists.[Conclusion] In the processing, the relationship between the processing speed,output power and processing depth should be strictly controlled. When processing depth was large, it should be appropriate to enlarge the processing speed, otherwise it will produce charring. Experiments showed that the processing technology of the wood processed by nanosecond water guide laser has certain feasibility.

Key words: nanosecond water guide laser, influencing factor, test bed, charring, processing quality