为了评价CO₂激光切割模切板表面质量,采用宏观、微观表面观察和碳元素含量测定这3种方法来研究CO₂激光切割模切板表面附着炭层和激光功率、切割速度之间的关系。试验结果表明,模切板切割表面附着炭层的区域随着切割速度的降低而扩大;同一功率下,切割速度越大,切割表面条纹越明显,且随着切割速度的降低而逐步减轻直至消失;切割速度较低时,随着激光功率的增加,附着在表面的炭将减少;较高速度时,随着激光功率的增加,切割表面附着的炭层浓度相差不大,但是条纹不是很显著;顺着纹理方向的炭层沿着纹理方向平铺分布,垂直纹理方向的炭层呈蜂窝状分布,两者均存在有气孔,随着速度降低,网格间的气孔直径减小。该结果对分析激光切割模切板表面质量是有帮助的。

In order to evaluate the surface quality of a laser cutting die-board,the relationship between carbon layer attacked to die-board surface and laser cutting parameters were analyzed through three methods,i.e.macroscopic observation,microcosmic observation and carbon content measurement.Results indicate that carbon area will extend with the decreasing of cutting speed.The surface striation becomes prominent with the increasing of cutting speed at the same laser power,while diminishes or vanishes with reducing the speed.In the case of lower speed,carbon attacked to surface will decrease with increasing of laser power.In the case of higher speed,carbon attacked to surface is almost the same with increasing of laser power and surface striation is not so prominent.Carbon layer is distributed along the wood grain,while honeycomb distributed perpendicular to the wood grain.Both cases exist holes and the hole diameter reduces with the decreasing of speed.