聚丙烯管钟形成形机热过程的流动特点

K. Romanenko, A. Polyakov, I. Nikitina
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引用次数: 0

摘要

介绍了聚丙烯管钟形成形机热过程的计算机模拟结果。提供机的一个特点是存在两个工作区。在第一个区域,对聚丙烯管进行加热,在第二个区域进行塑性变形。在每个区域中,在启动时实现了单独的瞬态热模型。在热身区解决了两个问题。第一个问题的求解允许采用倾倒浇注算法对加热元件进行加热,以保证管的可变形部分的趋势温度。第二个问题的解决使得确定两种尺寸的管的受热部分的温度延伸和内外炉的膨胀成为可能。在塑性变形区,给出了两种模型的计算机模拟结果。第一个模型考虑给邮票和芯轴注入冷却水。在第二种模型中,相反,研究了加热冲压件和芯轴的选择。在热身区提出的热模型的一个特点是使用条件固态环境,结合空气特性和弹性区域的可变形材料。所使用的管材塑性变形区热模型的一个特点是以固定温度的形式计算边界和初始条件。所得到的建模结果在实际制造的机器上得到了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
FEATURES OF THE FLOW OF THERMAL PROCESSES IN THE MACHINE FOR BELL FORMATION IN POLYPROPYLENE TUBES
The results of computer modeling of thermal processes in the machine for the formation of a bell in pol-ypropylene tubes are presented. A feature of the providing machine is the presence of two working zones. In the first zone, polypropylene tubes are heated, and their plastic deforming is performed in the second zone. In each zone, individual thermal models are implemented in transient in the start. Two problems were solved in the warm -up zone. The solution of the first problem allowed the dumping-pouring algorithm for the heating of the heating elements used to ensure the trendy temperature of the deformable section of the tube. The solution of the second problem made it possible to determine the emerging temperature extensions of both the heated section of the tube and the expansion of the internal and outer furnaces for two sizes of the tubes. In the plastic deformation zone, the results of computer modeling for two models are also presented. The first model considered the supply of cooling water into stamps and a mandrel. In the second model, on the contrary, the option of warming up stamps and mandrel was investigated. A feature of the proposed thermal models in the warm-up zone is the use of a conditional solid-state environment with combined air characteristics and deformable material in the elastic region. A feature of the used thermal models in the zone of plastic deformation of the tube was the task of the boundary and initial conditions in the form of fixed temperatures. The obtained modeling results were confirmed experimentally on the manufactured machine.
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