【摘要】 为提高快速成形工艺的精度,利用Taguchi方法对影响扫描平面内成形精度的主要因子(扫描速度、线宽补偿、树脂收缩补偿系数及扫描间距),进行了优化实验研究。通过对实验结果的信号干扰比进行方差分析,发现扫描间隔、线性收缩补偿系数以及扫描速度与扫描间隔的交互作用对扫描平面内制作精度有显著影响,扫描速度与线宽补偿的交互作用及扫描速度与线性收缩补偿的交互作用对制作精度有一定的影响。针对高分辨率激光快速成形系统,得出了以扫描平面内制作精度为优化目标的制作参数的最佳组合。验证实验结果表明,最佳制作条件下制件的误差已减小到3μm,表明最佳因子组合方案是合理可行的,该参数的最佳组合可显著提高制作精度。更多还原

【Abstract】 To improve the dimension accuracy in scanning plane,an experimental investigation had been carried out to determine the optimum build parameters of high-resolution stereolithography(SL) system with Taguchi method.The building parameters are laser beam scanning speed(factor A),cured line width compensation factor(factor B),hatch spacing(factor C) and xy-shrinkage compensation factor (factor D).By using analysis of variance(ANOVA),it is found that factor C,factor D and the interaction between factor A and factor C significantly affect the dimension accuracy,and the interaction between A and B,the interaction between A and D,also have effects on the dimension accuracy.Based on the experimental results,an optimum factor combination of the high-resolution SL system was concluded.With the optimum factor combination,an error of 0.003mm in the horizontal X and Y dimension has been reached using the high-resolution SL system.Confirmation experimental results show that the dimension accuracy has been significantly improved with the optimum factor combination.更多还原