ABSTRACT

An extrusion-based additive manufacturing process for investment casting shell mould is introduced in this paper. This process uses silica sol bauxite slurry to build shell mould. The shell mould is made up of thin walls around the casting cavity, and its additive manufacturing process is actually the building process of walls. The effect of process parameters on the dimensional accuracy of the bauxite shell mould was investigated. Taguchi’s design and Analysis of Variance (ANOVA) approach was used to evaluate and optimise the process parameters viz. wall thickness, wall height and filling pattern for dimensional accuracy. The results indicate the wall thickness, filling pattern and wall thickness are the most significant parameters affecting the dimensional accuracy in X, Y and Z directions, respectively. It is suggested that the wall thickness is set as 10 mm and the filling pattern is set as rectilinear for shell mould.

摘要

本文介绍了一种用于熔模铸造壳模的基于挤压的增材制造工艺。该工艺使用硅溶胶铝土矿浆料来制作壳模。壳模由铸造型腔周围的薄壁组成，其增材制造过程实际上是壁的建造过程。研究了工艺参数对铝土矿壳模尺寸精度的影响。田口的方差设计和分析 (ANOVA) 方法用于评估和优化工艺参数，即。壁厚、壁高和填充图案以确保尺寸精度。结果表明，壁厚、填充图案和壁厚分别是影响 X、Y 和 Z 方向尺寸精度的最重要参数。