Milling a cement-based 3D printable mortar in its green state using a ball-nosed cutter

Milling a cement-based 3D printable mortar in its green state using a ball-nosed cutter
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使用球头铣刀铣削未加工状态的水泥基 3D 打印砂浆

DOI:
10.1016/j.cemconcomp.2021.104266
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发表时间:
2022
影响因子:
10.5
通讯作者:
Dobrzanski J
Dobrzanski J
中科院分区:
工程技术1区
文献类型:
--
作者:
Dobrzanski J

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3D混凝土打印的一个关键优点是不需要模具,实现一次性和小批量生产,零件几何形状变化较大。由分层产生的楼梯效果被用作许多应用程序的特征,但是对于光滑的表面和组件之间的接口,这可能并不总是理想的。此外,打印过程中零件的整体变形可能会影响最终元件的精度。为了在这方面与铸造等价物竞争,可以在印刷后应用二次处理,如减法铣削和镘刀。这些都是混凝土数字制造领域的相对较新的发展,关于方法的出版工作很少,特别是没有研究碾磨对3D打印砂浆表面状况的影响。本文从制造工具的角度探讨了这些问题,并发现可以形成高质量的表面,其粗糙度受混合料中骨料的大小和材料的设置状态的影响,需要接近固体状态。在实践中,这导致了一个“铣削窗口”,这对工艺时间和机器人系统的影响通常部署在3D混凝土打印应用中。
A key benefit of 3D concrete printing is the removal of the need for a mould enabling one-off and low volume production with greater variability in part geometry. The staircase effect generated by the layering is used as a feature of many applications, however for smooth surfaces and at interfaces between components, this may not always be desirable. In addition, global deformation of the part during printing may influence the accuracy of the final element. In order to compete with cast equivalents in this regard, secondary treatments such as subtractive milling and trowelling can be applied post printing. These are relatively new developments in the field of digital fabrication with concrete and there is little published work on methods and in particular, none that examine the effect of milling on the surface condition of 3D printing mortar. This paper explores these issues based on a manufacturing tooling perspective and finds that high quality surfaces can be formed, the roughness of which is affected by the size of the aggregates in the mix and the set-state of the material, which needs to be close to the solid state. In practice, this results in a ‘milling window’ which has implications for process timing and the robotic systems typically deployed for 3D concrete printing applications.
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