The Digital Twin concept, as the cutting edge of digital manufacturing solution for modern industries, plays a significant role in the Industry 4.0 era. One key enabling technology for developing a DT is the information modeling of physical products, so as to combine the physical world with the cyberspace more extensively and closely. Therefore, the modeling approach to managing as-fabricated data of physical products, which faithfully reflects the product's physical status, emerges to be pivotal. This paper addresses the problem of modeling as-fabricated parts in the machining process, which is difficult to accomplish by relevant methods, and hinders the long-term data archiving and reuse of process data. Furthermore, to fill the gap, an ontology-based information modeling method of as-fabricated parts is proposed as the recommendation to create DTs for as-fabricated parts. It provides a simple and standardized process for companies to create DTs of as-fabricated parts by specifying the information classification, the contents to be modeled and the modeling method. To validate the effectiveness of the proposed approach, a case study is undertaken in an aviation manufacturing plant at last. The result shows that the proposed information modeling methodology is readily to DT creation of as-fabricated parts.

作为现代工业数字制造解决方案的最前沿，数字孪生概念在工业4.0时代起着重要作用。开发DT的一项关键技术是物理产品的信息建模，以便将物理世界与网络空间更广泛，更紧密地结合在一起。因此，忠实反映产品物理状态的用于管理物理产品加工数据的建模方法显得至关重要。本文解决了在加工过程中对零件进行建模的问题，这种问题很难通过相关方法来完成，并且阻碍了长期数据归档和过程数据的重用。此外，为了填补空白，提出了一种基于本体的零件信息建模方法，作为建立零件DT的建议。通过指定信息分类，要建模的内容和建模方法，它为公司提供了一个简单而标准化的过程来创建零件的DT。为了验证所提出方法的有效性，最后在一家航空制造工厂进行了案例研究。结果表明，所提出的信息建模方法易于对零件的DT进行创建。为了验证所提出方法的有效性，最后在一家航空制造工厂进行了案例研究。结果表明，所提出的信息建模方法易于对零件的DT进行创建。为了验证所提出方法的有效性，最后在一家航空制造工厂进行了案例研究。结果表明，所提出的信息建模方法易于对零件的DT进行创建。