FDM工艺缝隙模型及消除方法研究

Research on gap model and elimination method in FDM process

熔融沉积成型作为一种成本低、稳定性高的快速成型工艺,在三维模型制造和新产品开发领域的应用不断扩大.针对熔融沉积成型制件中光栅线与轮廓线之间出现的缝隙,分析了其产生的原因并建立了缝隙熔合模型.将理论计算与实验结果进行对比,研究了光栅角度、路径宽度对缝隙面积的影响,获得了光栅角度θ∈[0°,90°]时缝隙面积的变化规律,提出了减小孔状缝隙、避免线状缝隙产生的解决方案,为合理选择光栅角度和路径宽度,改善制件质量提供了科学依据.

As a rapid prototyping technology with low cost and high stability,the application of FDM（fused deposition modeling）process is increasing in the field of three dimensional model manufacturing and new product development.The gap fusion model is established for the gap among rasters and contours according to its generation mechanism,and then the theoretical calculation is compared with the experimental results.The conclusion points out the influence of raster angle and fill path width to gap area.Variation regularity of gap area affected by raster angle（θ∈[0°,90°]）is analyzed detailedly.Solutions to reduce the poroid gap and avoid the threadlike gap are indicated,which have directive significance to choose reasonable raster angle and fill path width and improve the quality of FDM parts.