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首页> 外文会议>The 7th China-Japan-Korea joint symposium on optimization of structural and mechanical systems >The Lattice Structure Design for the Stereolithography Based Investment Casting Model
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The Lattice Structure Design for the Stereolithography Based Investment Casting Model

机译：基于立体光刻的熔模铸造模型的晶格结构设计

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Stereolithography (SL) based investment casting, also known as the rapid casting, is a new casting technology which uses the SL rapid prototyping model as the expendable pattern.However, many problems have to be solved to improve the efficiency and reliability of the rapid casting procedure.One of the key difficulties is to avoid the crack of the ceramic shell during the burnout of the SL pattern.Normally the SL epoxy resin is a thermoset material whose coefficient of thermal expansion (CTE) is 10 times higher than the CTE of the ceramic shell.During the heating procedure, a significant thermal expansion of the resin pattern will unfortunately break the ceramic shell and fail the investment casting.Actually, to solve the problem, it is found that the resin patterns have to be produced much weaker to lower the thermal expansion force loaded on the ceramic shell. The practical SL patterns are always designed as hollowed and some heuristically designed periodic lattice structures are used to fill the cavity. The purpose of this paper is to demonstrate the necessity of topology optimization design for the SL based investment casting resin model.In this paper, we first present some numerical analysis of the SL resin patterns filled with existing lattice structures.Both the thermal expansion and the mechanical loads are taken into account and applied on the resin pattern.By evaluating the stress level in the ceramic shell and the stiffness of the resin pattern itself, it is found that the existing solutions do not perfectly adapt to arbitrary patterns with different geometry design.Later, the lattice structures are further designed with topology optimization for different SL patterns. The inner part of the resin pattern is assigned as the design domain. The topology optimization is to find a proper distribution of the resin material to reduce the stress level and maintain certain stiffness for the pattern.By comparing the optimal design with the existing solutions, the effect of topology optimization is significant. The newly obtained designs have shown better performances.
机译：基于立体光刻（SL）的熔模铸造，也称为快速铸造，是一种使用SL快速原型模型作为消耗型的新型铸造技术，但是要提高快速铸造的效率和可靠性，还需要解决许多问题关键困难之一是要避免SL图案烧坏时陶瓷外壳的破裂。通常SL环氧树脂是一种热固性材料，其热膨胀系数（CTE）是其CTE的10倍。在加热过程中，树脂图案的显着热膨胀会不幸地破坏陶瓷外壳并导致熔模铸造失败。实际上，为了解决这个问题，发现必须将树脂图案制作得很弱才能降低陶瓷外壳上的热膨胀力。实际的SL模式始终设计为空心的，并使用启发式设计的周期性点阵结构填充空腔。本文的目的是证明基于SL的熔模铸造树脂模型进行拓扑优化设计的必要性。本文首先对填充有现有晶格结构的SL树脂模型进行一些数值分析。考虑到机械载荷并将其施加到树脂图案上。通过评估陶瓷外壳中的应力水平和树脂图案本身的刚度，发现现有解决方案不能完美地适应具有不同几何设计的任意图案。后来，通过针对不同SL模式的拓扑优化进一步设计了晶格结构。树脂图案的内部被指定为设计区域。拓扑优化是为了找到合适的树脂材料分布，以降低应力水平并保持图案的一定刚度。通过将优化设计与现有解决方案进行比较，拓扑优化的效果显着。新获得的设计具有更好的性能。

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