Bi-objective design optimization for weldline reduction and short cycle time using variable injection velocity and variable packing pressure in plastic injection molding
Bi-objective design optimization for weldline reduction and short cycle time using variable injection velocity and variable packing pressure in plastic injection molding
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DOI：
10.1299/transjsme.20-00161
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Kitayama;Sara Hashimoto;M. Takano;Y. Yamazaki;Yoshikazu Kubo;Shuji Aiba
中科院分区：
文献类型：
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作者：
S. Kitayama;Sara Hashimoto;M. Takano;Y. Yamazaki;Yoshikazu Kubo;Shuji Aiba
由于两个或多个流动前沿相遇时形成的熔接线不仅对外观而且对塑料产品的强度有影响，因此尽可能减少熔接线是很重要的。已有研究表明，较高的注射速度可以有效地减少焊缝，但会导致注射不足。除了减少熔接线之外，注塑成型还需要高生产率。因此，短的循环时间是更优选的。为了减少熔接痕，缩短成型周期，避免短射，本文采用了变注射速度和变保压压力的方法。这两种情况都是未知的，很难同时确定它们。为了确定这两个配置文件，一个双目标设计优化问题的构造和焊缝减少和周期时间之间的帕累托边界被确定。采用径向基函数网络的序贯近似优化方法，通过少量的仿真来识别帕累托前沿。基于数值计算结果，进行了实验，以检验所提出的方法的有效性。
As weldline that is formed when two or more flow fronts meet has an influence on not only the appearance but also the strength of a plastic product, it is important to reduce it as much as possible. It has been reported that a high injection velocity is effective to the weldline reduction, but results in short shot. In addition to the weldline reduction, high productivity is always required in plastic injection molding. Thus, short cycle time is much preferable. For weldline reduction and short cycle time without short shot, this paper adopts variable injection velocity and variable packing pressure. Both profiles are unknown and it is difficult to determine them simultaneously. To determine both profiles, a bi-objective design optimization problem is constructed and the pareto-frontier between the weldline reduction and the cycle time is identified. Sequential approximate optimization using radial basis function network is used to identify the pareto-frontier with a small number of simulations. Based on the numerical result, the experiment is carried out to examine the validity of the proposed approach.