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首页> 外文期刊>Materials and Manufacturing Processes >Understanding Invert Forming of Thin-Walled Polyvinyl Chloride Tubes Using a Die Based on a Mechanical Flow Formulation
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Understanding Invert Forming of Thin-Walled Polyvinyl Chloride Tubes Using a Die Based on a Mechanical Flow Formulation

机译：了解基于机械流配方的模具对薄壁聚氯乙烯管的逆向成形

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摘要

The design of sound metallic double-walled tubular parts by internal and external inversion using a die is presently well established. Major operating parameters are identified and the typical modes of deformation that can occur during the process are fully characterized. In contrast to metals, there are no practical design rales and no published research work in the specialized literature concerning the manufacture of double-walled polymer tubes by inversion. This article is concerned with the abovementioned lack of knowledge and is a contribution towards the application of existing metallic tube inversion technologies to polymers. The experimental research work makes use of Polyvinyl Chloride (PVC) and the overall findings are interpreted in the light of an innovative extension of the flow formulation that is capable of modeling cold plastic deformation of pressure-sensitive materials under a non-associated flow rule. Emphasis is placed on the deformation mechanics of tube inversion applied to PVC and on the influence of the major operating parameters on the overall formability limits of the process. Results show that invert-forming of thin-walled PVC tubes using a die can be successfully utilized for producing custom and specific shapes at the tube ends.
机译：通过模具的内部和外部倒置，设计出良好的金属双壁管状零件的设计是目前公认的。确定主要的操作参数，并充分表征过程中可能发生的典型变形模式。与金属相反，在专门的文献中没有关于反演制造双壁聚合物管的实用设计规则，也没有公开的研究工作。本文关注的是上述知识的缺乏，并为将现有的金属管反型技术应用于聚合物做出了贡献。实验研究工作利用了聚氯乙烯（PVC），并且根据流动剂型的创新扩展来解释整体发现，该流动剂型能够在非关联流动规则下模拟压敏材料的冷塑性变形。重点放在应用于PVC的管倒置的变形力学上，以及主要操作参数对工艺总体可成型性极限的影响上。结果表明，使用模具对薄壁PVC管进行倒装成型可成功地用于在管端生产定制和特定形状。

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