The effects of filling patterns on the powder-binder separation in powder injection molding
The effects of filling patterns on the powder-binder separation in powder injection molding
复制标题
粉末注射成型中填充方式对粉末-粘结剂分离的影响
DOI：
10.1016/j.powtec.2014.01.065
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发表时间：
2014-04-01
影响因子：
5.2
通讯作者：
Qu Xuanhui
中科院分区：
文献类型：
--
作者：
Fang Wei;He Xinbo;Qu Xuanhui
粉末与粘合剂的分离是注射成型过程中常见的困难，这导致脱脂和烧结阶段的不均匀性。以往的研究重点关注“最终结果”和“初始条件”之间的关系，而忽略了原料的动态填充过程和粉末-粘合剂分离的演变。这项工作研究了粉末注射成型过程中填充模式对粉末-粘合剂分离的影响。基于多相流体理论和原料粘度模型，建立了PIM的充模模型。根据实验数据修正了粘度模型的参数。将数值模拟与具有相同工艺参数的实验进行比较。通过 X 射线计算机断层扫描 (CT) 检测生坯中的粉末-粘合剂分离现象。通过数值模拟方法获得的粉末-粘合剂分离的演变清楚地解释了实验现象。提出了一种典型的 PIM 压实填充模式和原料的填充流动性变量。合适的填充方式有助于保证原料的流动性和坯体的均质性。 (C) 2014 年作者。由 Elsevier B.V. 出版
The powder-binder separation is a common difficulty during injection molding, which leads to the inhomogeneity in the debinding and sintering stages. Previous studies focus on the relationship between "final results" and "initial conditions", while the dynamic filling process of feedstock and the evolution of powder-binder separation were ignored. This work investigated the effects of filling patterns on the powder-binder separation during powder injection molding. The mold filling model of PIM has been developed, based on the multiphase fluid theory and the viscosity model of feedstock. Parameters of the viscosity model were modified by the experimental data. Numerical simulations were compared with experiments with the same process parameters. The powder-binder separation phenomena in green bodies were detected by X-Ray computed tomography (CT). The experimental phenomena were explained clearly by the evolution of powder-binder separation obtained with numerical simulation method. A typical compacting filling pattern of PIM and filling mobility variable of the feedstock were proposed. A proper filling pattern was helpful to ensure the mobility of feedstock and the homogeneity of green body. (C) 2014 The Authors. Published by Elsevier B.V.