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随着3D打印技术的发展,注塑模具的冷却水道设计由传统的直线型设计优化为随形水道设计.对国内外随形冷却水道的设计方法和发展现状进行了综述,并对随形冷却水道的设计原则、截面形状变化、布局以及优化技术进行了详细的阐述,并做了归纳总结.注塑模具采用随形水道设计,可使冷却介质与型腔表面距离一致,能提高冷却效率、成型效率和模具型腔表面温度分布的均匀性,从而使成型制品的质量和性能得到较大改善和提高. 相似文献
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《塑料》2018,(5)
随形冷却水道可改善传统冷却直水道冷却不均匀问题,但设计和制造过程中需通过大量实验确定参数,浪费材料,效率低和制造成本高。文章以曲面塑件为研究对象,设计了5种冷却水道,通过Moldflow软件模拟分析比较,得出冷却性能最佳的方案,结果表明,与传统冷却直水道相比,最佳冷却时间缩短了61. 67%,型腔最高温度减少了32. 99℃,温度均匀性提高了5. 5%,最大翘曲变形量减少了0. 97 mm,利用三维扫描仪分别扫描随形冷却塑件与直水道塑件,并与三维设计塑件进行CAD曲面比较,分析翘曲变形偏差值。实践发现,随形冷却水道塑件与直水道塑件相比,注塑周期相差1. 07 s,翘曲变形偏差值相差1. 9 mm,与Moldflow模拟分析数据较为接近。 相似文献
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以塑料链板注塑模冷却水道的水道中心距、水道中心至模壁距离及水道直径为实验因素,利用响应面法分别构建出3个实验因素与模壁温差、冷却时间之间的二阶响应面模型。运用Pareto遗传算法对2个响应面模型进行迭代优化,优化出模壁温差和冷却时间都较小时的设计参数最优解解集,模拟验证后得出冷水道最优设计参数组合为:水道中心距30 mm、水道中心至模壁距离15 mm、水道直径10 mm,对应的模壁温差为7.61 ℃、冷却时间为62.74 s,比任一组响应面实验结果都小,证明了分析方法的可行性。 相似文献
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本文介绍了在微机上开发塑料注射模具计算机辅助设计(CAD)的技术,侧重介绍塑料材料的智能化选择系统与注射模具冷却水道的计算机辅助设计。 相似文献
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本文运用复合材料的层合理论,对玻璃钢立式园柱形贮罐进行了应力及应变分析,并结合具体设计实例,介绍了设计玻璃钢立式园柱形贮罐的基本方法。. ’ 相似文献
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运用Pro/E软件合理地设计了汽车内饰件文件盒衬板注塑模具.根据产品的结构,设计了独特的横向斜错位非对称斜顶侧向抽芯机构和深水孔加冷却水道的冷却系统,提高了模具的冷却效果,确保了产品顺利脱模.模具结构简单紧凑,制造成本低. 相似文献
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以达到注塑件模具的某一模温为优化目标,考虑了模板热传导阻力和水对冷却水道壁的给热系数,用试差法求解冷却水道一边所需的传热面积,并完成冷却系统的设计计算。 相似文献
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结合响应曲面法和粒子群优化算法研究了注塑模冷却水道的工艺参数优化,使塑料件在一定的模壁温差下,冷却时间最短。将手机后盖的3D模型导入Moldflow中进行网格划分并对其冷却过程进行模拟,结合BoxBehnken试验设计和响应曲面法得到冷却水道工艺参数与冷却时间和模壁温差之间拟合的回归方程,再通过粒子群优化算法,得到最佳冷却水道工艺参数组合即冷却水道距模具型腔表面的距离为8.851 3 mm、冷却水道直径为12 mm,冷却水道之间的距离为11.054 2 mm,通过对优化的组合参数进行模拟,验证了其可行性。 相似文献
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基于传热学理论,对挤出成型塑料管材的冷却过程进行了分析并建立了数学模型。引入聚合物的比热容和热导率对温度的依赖关系,运用有限差分数值方法,求解变物性参数条件下一维非稳态传热方程,模拟了塑料管材在定型冷却过程中的温度场,并由此确定冷却段的合理长度。 相似文献
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《Polymer-Plastics Technology and Engineering》2013,52(5):971-982
Abstract The dimensions quality of the injection‐molded parts is the result of a complex combination of material, part, and mold designs and process conditions. In this article, warpage prediction relies on the calculation of residual stresses developed during the molding process. The solidification of a molten thermoplastic between cooled parallel plates is used to model the mechanics of part warp in the injection‐molding process. Flow effects are neglected, and a thermorheologically simple thermoviscoelastic material model is assumed. The warp and residual stresses numerical simulation with finite element method (FEM) is time dependent. At each time step, the material properties can be temperature and pressure dependent. Mold temperature or mold‐cooling rate effects on part warp have been numerically predicted and compared with experimental results. By showing the mold‐cooling effects, it was concluded that mold cooling has a significant effect on part warpage, and mold‐cooling parameters, such as mold temperature, resin temperature, cooling channels, etc., should be set carefully. 相似文献
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本文对油罐区消防设计时,规范的采用及消防冷却方式的选择,提出了看法和建议,并结合工程实例进行计算和对比,提出冷却水量和冷却方式的确定方法 相似文献
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The cooling system of a high‐temperature PEM fuel cell with a nominal electric power of 1.5 kW for a combined heat and power unit (CHP) has been designed using a thermochemical model. The 1D model has been developed as a simple, predictive, and useful tool to evaluate, design, and optimize cooling systems of PEM fuel cells. As proved, it can also be used to analyze the influence of different operational and design parameters, such as the number and geometry of the channels, or the air flow rate, on the overall performance of the stack. To validate the model, predicted results have been compared with experimental measurements performed in a commercial 2 kW air‐forced open‐cathode stack. The model has then been applied to calculate the air flow required by the designed prototype stack as a function of the power output, as well as to analyze the influence of the cooling channels configuration (cross‐section geometry and number) on the heat management. Results have been used to select the optimum air‐fan cooling system, which is based on compact axial fans. 相似文献
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Ozonization of water in a cooling tower was investigated. A laboratory experimental set-up was employed to study changes in water quality during ozonization. Measured data were analyzed in the context of cooling water's resistance to corrosion, scaling and biofouling. A method is proposed for determining the suitable dosage of ozone for maintaining the necessary water quality. It has been found that ozonization is very effective in maintaining the correct water quality for the required purpose and provides an attractive alternative to the conventional multiple chemical method of cooling water treatment. 相似文献