Manufacturability evaluation for molded parts using fictitious physical models, and its application in topology optimization
Manufacturability evaluation for molded parts using fictitious physical models, and its application in topology optimization
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DOI：
10.1007/s00170-017-0218-0
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发表时间：
2017-09-01
影响因子：
3.4
通讯作者：
Nishiwaki, Shinji
中科院分区：
文献类型：
--
作者：
Sato, Yuki;Yamada, Takayuki;Nishiwaki, Shinji
铸造和注射成型等使用模具的制造方法在工业中得到广泛应用。使用这种制造方法时的基本要求是，设计工程师必须设计产品，以便它们包含某些几何特征，这些几何特征允许模具部件从所创建的实体物体中移除。在本研究中，我们提出了一个可制造性评价方法，特别是适用于模具的使用。为了评估的可制造性，我们引入虚拟的物理模型，所描述的稳态各向异性对流扩散方程。在这些虚拟物理模型中，材料域具有虚拟源项，并且平流方向与模具部件分开的方向沿着对齐。所有虚拟物理场的值都很高的空洞区域则表示将阻止模具被释放的底切几何形状或不能铸造的内部空洞。因此，可以使用这些虚拟物理场来评估可制造性。此外，在本研究中，我们将这种评价方法与拓扑优化，并提出了一个方案，在拓扑优化过程中施加成型约束。这种新提出的拓扑优化方法可以考虑模具分型线的位置之前，详细的优化过程。数值算例验证了所提方法的有效性。
Manufacturing methods using molds, such as casting and injection molding, are widely used in industries. A basic requirement when using such manufacturing methods is that design engineers must design products so that they incorporate certain geometrical features that allow the mold parts to be removed from the created solid object. In the present study, we propose a manufacturability evaluation method especially adapted for the use of molds. To evaluate the manufacturability, we introduce fictitious physical models that are described by steady-state anisotropic advection-diffusion equations. In these fictitious physical models, material domains have a virtual source term and the advection directions are aligned with the directions along which the mold parts are parted. Void regions, where the values of all fictitious physical fields are high, then represent either undercut geometries that would prevent the mold from being released, or interior voids that cannot be cast. Consequently, manufacturability can be evaluated using these fictitious physical fields. Furthermore, in the present study, we integrate this evaluation method with topology optimization and propose a scheme for imposing a molding constraint within the topology optimization procedure. This newly proposed topology optimization method can consider the position of mold parting lines prior to the detailed optimization procedure. Several numerical examples are provided to demonstrate the validity and effectiveness of the proposed method.