Characterisation of the decoring behaviour of inorganically bound cast-in sand cores for light metal casting
Characterisation of the decoring behaviour of inorganically bound cast-in sand cores for light metal casting
复制标题
DOI：
10.1016/j.jmatprotec.2021.117201
复制
发表时间：
2021-05-22
影响因子：
6.3
通讯作者：
Guenther, Daniel
中科院分区：
文献类型：
--
作者：
Ettemeyer, Florian;Schweinefuss, Maria;Guenther, Daniel
本文提出了一种对轻金属铸造用不同铸型砂芯的除芯行为进行分类的新方法。砂芯用于在铸造零件中实现空心结构。由于环境要求，越来越多的无机粘结砂芯被使用，与有机粘结砂芯相比，无机粘结砂芯在铸造过程中不会分解。在铸造过程结束后，需要通过称为去芯的过程去除无机结合的铸型砂芯。建造了一个源自工业除芯过程的测试装置，以研究除芯行为并测量除芯的工作量。所提出的方法基于施加在测试几何体上的单脉冲。该方法的目标是了解影响砂芯除芯行为的因素。因此，使用所开发的试验装置对具有不同量的粘合剂和不同的粒度分布的不同砂粘合剂系统进行去除和检查。使用模拟方法验证实验结果表明，砂芯的残余压缩强度对其除芯行为有很大影响。作者表明，具有较高残余压缩强度的样本比具有较低残余压缩强度的样本更难去芯。本文提出的方法和结果为去花过程的数字孪生建模奠定了基础，而去花过程是铸造技术数字流程链中缺失的一环。
This article proposes a new method to classify the decoring behaviour of different cast-in sand cores for light metal casting. Sand cores are in use to realise hollow structures in casting parts. More and more inorganically bound sand cores are used due to environmental requirements, which, in contrast to organically bound sand cores, do not disintegrate during the casting process. The inorganically bound cast-in sand cores need to be removed after the casting process by a process called decoring. A test rig derived from the industrial decoring process was built to investigate the decoring behaviour and to measure the effort of decoring. The proposed method is based on single impulses imposed on the test geometry. The goal of this approach is to understand the factors influencing the decoring behaviour of a sand core. Therefore, different sand-binder systems, with varying amounts of binder and different grain size distributions, were decored and examined with the developed test rig. A validation of the experimental results using simulation methods showed a high influence of the residual compression strength of the sand cores to their decoring behaviour. The authors showed that specimens with a higher amount of residual compression strength are more difficult to decore than specimens with a lower amount of residual compression strength. The methods and results presented in this article build the foundation to model a digital twin of the decoring process which is a missing link in the digital process chain in casting technologies.