在熔融沉积成型过程中,打印参数对成型样件精度有着重要影响.为了提高整体尺寸精度,采用随机游走的麻雀算法获得最优实验方案.首先,以熔融沉积成型的分层厚度、喷头温度、打印速度和填充率为实验变量设计4因素4水平的正交试验;然后,以样件不同特征结构尺寸的相对误差为优化对象,使用田口-灰色关联法对实验数据进行处理;最后,通过随机游走的麻雀算法计算最优参数方案.结果表明,相比常用的田口-灰色关联法,采用优化后工艺参数成型样件的综合尺寸精度提高了 20%,灰色关联度提高了 27%.
In the fused deposition molding process,the printing parameters have an important impact on the accuracy of the molded specimens.In order to improve the overall dimensional accuracy,the random walk sparrow algorithm is employed to obtain the optimal experimental scheme.Firstly,the orthogonal test of four factors and four levels is designed with the delamination thickness,heating temperature,print-ing speed,and filling rate of melt deposition molding as the experimental variables.Subsequently,the Taguchi-grey correlation method is used to process experimental data,with the relative error of the differ-ent characteristic structure sizes of the sample as the optimization object.Finally,the passed Random walk sparrow algorithm is utilized to calculate the optimal parameter scheme.The results indicate that the sam-ple formed by the optimized process parameters has a 20%increase in the comprehensive dimensional accu-racy compared with those obtained using Taguchi-gray correlation method,with a 27%increase in the gray correlation value.