This paper aims to focus on an experimental study of surface roughness, dimensional accuracy and time of fabrication of parts produced by fused deposition modelling (FDM) technique of additive manufacturing. The fabricated parts of acrylonitrile butadiene styrene (ABS) material have pyramidal and conical features. Influence of five process parameters of FDM, namely, layer thickness, wall print speed, build orientation, wall thickness and extrusion temperature is studied on response characteristics. Furthermore, regression models for responses are developed and significant process parameters are optimized.,Comprehensive experimental study is performed using response surface methodology. Analysis of variance is used to investigate the influence of process parameters on surface roughness, dimensional accuracy and time of fabrication in both outer pyramidal and inner conical regions of part. Furthermore, a multi-response optimization using desirability function is performed to minimize surface roughness, improve dimensional accuracy and minimize time of fabrication of parts.,It is found that layer thickness and build orientation are significant process parameters for surface roughness of parts. Surface roughness increases with increase in layer thickness, while it decreases initially and then increases with increase in build orientation. Layer thickness, wall print speed and build orientation are significant process parameters for dimensional accuracy of FDM parts. For the time of fabrication, layer thickness and build orientation are found as significant process parameters. Based on the analysis, statistical non-linear quadratic models are developed to predict surface roughness, dimensional accuracy and time of fabrication. Optimization of process parameters is also performed using desirability function.,The present study is restricted to the parts of ABS material with pyramidal and conical features only fabricated on FDM machine with delta configuration.,From the critical review of literature it is found that some researchers have made to study the influence of few process parameters on surface roughness, dimensional accuracy and time of fabrication of simple geometrical parts. Also, regression models and optimization of process parameters has been performed for simple parts. The present work is focussed on studying all these aspects in complicated geometrical parts with pyramidal and conical features.

中文翻译：

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熔融沉积成型零件表面粗糙度、尺寸精度和制造时间的实验研究

本文旨在对通过增材制造的熔融沉积建模 (FDM) 技术生产的零件的表面粗糙度、尺寸精度和制造时间进行实验研究。丙烯腈丁二烯苯乙烯（ABS）材料制成的零件具有金字塔形和圆锥形特征。研究了 FDM 的五个工艺参数，即层厚、壁印速度、构建方向、壁厚和挤出温度对响应特性的影响。此外，还开发了响应的回归模型并优化了重要的工艺参数。使用响应面方法进行了全面的实验研究。方差分析用于研究工艺参数对表面粗糙度的影响，零件的外锥体和内锥体区域的尺寸精度和制造时间。此外，使用合意性函数进行多响应优化以最小化表面粗糙度，提高尺寸精度并最小化零件的制造时间。发现层厚和构建方向是零件表面粗糙度的重要工艺参数。表面粗糙度随着层厚度的增加而增加，而它最初会降低，然后随着构建方向的增加而增加。层厚、壁面打印速度和构建方向是 FDM 零件尺寸精度的重要工艺参数。在制造时，发现层厚度和构建方向是重要的工艺参数。根据分析，开发了统计非线性二次模型来预测表面粗糙度、尺寸精度和制造时间。工艺参数的优化也使用合意函数进行。,本研究仅限于仅在三角形配置的 FDM 机器上制造的具有金字塔形和圆锥形特征的 ABS 材料零件。从文献的批判性回顾中发现一些研究人员研究了少量工艺参数对简单几何零件的表面粗糙度、尺寸精度和制造时间的影响。此外，还对简单零件进行了回归模型和工艺参数优化。目前的工作重点是研究具有金字塔形和圆锥形特征的复杂几何零件的所有这些方面。