Fan-Jiang Jia-Chen, Su Chi-Wei, Liou Guan-Yan, Hwang Sheng-Jye, Lee Huei-Huang, Peng Hsin-Shu, Chu Hsiao-Yeh
Department of Mechanical Engineering, National Cheng Kung University, Tainan 700, Taiwan.
Department of Engineering Science, National Cheng Kung University, Tainan 700, Taiwan.
Polymers (Basel). 2021 Feb 13;13(4):555. doi: 10.3390/polym13040555.
Injection molding is a popular process for the mass production of polymer products, but due to the characteristics of the injection process, there are many factors that will affect the product quality during the long fabrication processes. In this study, an adaptive adjustment system was developed by C++ programming to adjust the / switchover point and injection speed during the injection molding process in order to minimize the variation of the product weight. Based on a series of preliminary experiments, it was found that the viscosity index and peak pressure had a strong correlation with the weight of the injection-molded parts. Therefore, the viscosity index and peak pressure are used to guide the adjustment in the presented control system, and only one nozzle pressure sensor is used in the system. The results of the preliminary experiments indicate that the reduction of the packing time and setting enough clamping force can decrease the variation of the injected weight without turning on the adaptive control system; meanwhile, the master pressure curve obtained from the preliminary experiment was used as the control target of the system. With this system, the variation of the product weight and coefficient of variation () of the product weight can be decreased to 0.21 and 0.05%, respectively.
注塑成型是聚合物产品大规模生产中常用的工艺，但由于注塑工艺的特点，在漫长的制造过程中有许多因素会影响产品质量。在本研究中，通过C++编程开发了一种自适应调节系统，用于在注塑成型过程中调整/切换点和注射速度，以尽量减少产品重量的变化。基于一系列初步实验，发现粘度指数和峰值压力与注塑件的重量有很强的相关性。因此，在本控制系统中使用粘度指数和峰值压力来指导调节，并且系统中仅使用一个喷嘴压力传感器。初步实验结果表明，在不开启自适应控制系统的情况下，减少保压时间并设置足够的合模力可以降低注射重量的变化；同时，将初步实验得到的主压力曲线用作系统的控制目标。使用该系统，产品重量的变化和产品重量的变异系数（）可分别降至0.21和0.05%。
