Investigation on the Establishment and Analyses of Conformal Cooling Channel Design for Blow Mold

• Main Authors: LIEW, KAI-FU, 劉開虎
• Other Authors: PENG, HSIN-SHU
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/34434220137210265727

碩士 === 逢甲大學 === 機械與電腦輔助工程學系 === 105 === Cooling system is part of the design of mold, the heated plastic raw material is place to a lower temperature mold and to obtain the final product the mold is needed to be cool down, at this point the rely on cooling system is needed for cooling and stripping. Cooling system affected the demold time, product quality, product appearance and etc., the impact on quality is the largest. The cooling system of the mold-base, and the design of the cooling channel will affect the heat dissipation quality of the mold. The purpose of the design of the passageway is to make the products cool evenly and to form the product in a short time. Traditional cooling channel is process by drilling straight, the process is easy but have relatively long heat dissipation. In the progress of industrial equipment and process, blow molding industry in response to the trend of reducing the weight and cost, for the filling bottle gradually toward the reduction of the thickness of the preform and reduce the cooling time, as the thickness of the bottle become thicker, the required cooling time is longer. When the mold cooling temperature distribution is not uniform, serious affect will occurred on the product cooling effect, and cause the bottle to produce distortion and failure of bottle. Therefore, the purpose of this research is to study and discuss the influence of different modeling conditions on the cooling efficiency and mold temperature uniformity in conformal cooling channel of the blow-mold. In the first stage, the computational fluid dynamics method (ANSYS-FLUENT) is used to predict the traditional cooling channel’s temperature and cooling efficiency and the temperature of the mold surface distribution of the situation. As for the second stage, the establishment of a set of blowing mold-base cooling system for different types of passageway with different configuration into the Taguchi experimental L9 (34) direct table, the mold cooling rate and temperature uniform. On the third stage, the experimental model using 3D metal printing mold-base, with different cooling channel and temperature and flow rate to experiment, The surface heating and the surface temperature and distribution of the mold after heating are measured by the thermocouple and the infrared thermal imager. The actual measurement of the surface heating and the conformal cooling process and the temperature and distribution of the mold surface are carry out by the infrared heating device. The results are analyzed and compared to establish of the analysis verification and benefit assessment. The results show that the simulation on ANSYS-FLUENT platform are use simulate the cooling efficiency and temperature uniformity of the traditional cooling channel design. The simulation results are in close agreement with the actual experimental trend. The successful analysis effectively predicts of the mold-base, the required molding parameters and operating conditions. In the aspect of optimization of contour waterway, it is known from the results of Taguchi simulation analysis that the circular conformal cooling channel design, the number of passageway, the lower cooling water temperature and the higher cooling water flow rate can be obtained. Optimization of cooling efficiency in shaped conformal cooling design. From the experimental results of the mold-base, the comparison between the cooling efficiency and the mold surface temperature is obvious, and the CAE analysis and the experimental results all have the same trend.