Analysis of friction in the ejection of thermoplastic mouldings
Analysis of friction in the ejection of thermoplastic mouldings
复制标题
DOI：
10.1007/s00170-011-3573-2
复制
发表时间：
2012-04
期刊：
影响因子：
--
通讯作者：
Mário Correia;A. Miranda;M. Oliveira;C. Capela;A. S. Pouzada
中科院分区：
文献类型：
--
作者：
Mário Correia;A. Miranda;M. Oliveira;C. Capela;A. S. Pouzada
注塑热塑性塑料的顶出力取决于顶出瞬间的接触条件。在熔体注射过程中，聚合物零件表面的复制发生在模具表面上。喷射发生在很短的时间内，因此在模拟喷射过程时必须考虑静摩擦系数。为了了解弹射阶段摩擦所涉及的机制的贡献，采用了混合方法：犁耕的分析模拟、变形的数值模拟以及粘附力的实验推断。粗糙度、温度和接触压力与摩擦系数的相关性已得到证实。
The ejection force of injection-moulded thermoplastics depends on the contact conditions at the moment of ejection. Replication of the polymer part surface occurs onto the mould surface during injection of the melt. Ejection takes place in a very short time, hence the static coefficient of friction must be considered for modelling the ejection process. To understand the contribution of the mechanisms involved in the friction during the ejection stage, a mixed approach was followed: analytical simulation of the ploughing, numerical simulation of the deformation, and experimental inference of the adhesion. The relevance of roughness, temperature and contact pressure in the coefficient of friction was evidenced.