FSReman - Functional modeling of bolted joints under uncertain product conditions for remanufacturing

再制造是实现循环经济的最重要的过程，涉及对旧产品和产品部件的再加工。由于螺栓连接的可互换性，螺栓连接代表了再制造领域中连接的核心元素。螺栓连接的状况决定了重新组装产品的功能。腐蚀或甚至损坏的螺栓连接一方面会使拧松过程更加困难，另一方面，由于工艺参数的不利选择，存在对内螺纹造成永久损坏的风险。如果可能的话，钻出和插入新的线程是昂贵和耗时的。因此，在使用新螺栓重新拧紧时，需要对剩余承载能力进行功能性说明。但是，根据目前的研究状况，这是不可能的。该项目的目的是在不确定的产品条件下的螺栓连接的数据驱动的功能建模。为此目的，螺栓连接的功能建模是在这个项目中进行。再制造包括从腐蚀的螺纹拆卸腐蚀的螺栓的过程和将新螺栓拧入再制造的旧部件的螺纹中的下游拧入过程。过程和产品数据被记录下来，螺栓连接的功能模型被导出用于重新组装。该项目的结果是一个经过验证的功能模型，用于预测功能相关的变量，即再制造螺栓连接的承载能力和拧紧过程中的螺纹摩擦系数，以及模型开发方法。所得到的功能模型是基于现有的过程知识和已知的模型。随后，将使用本项目中收集的经验数据库（包括工艺和产品数据）进一步开发功能模型。

Remanufacturing, the most important procedure on the way to the circular economy, deals with the reprocessing of used products and product parts. Due to their detachability, bolt connections represent a central element for connections in the field of remanufacturing. The condition of the bolt connection determines the functionality of the reassembled product. Corroded or even damaged bolt connections can, on the one hand, make the unscrewing process more difficult, and, on the other hand, there is a risk of permanent damage to the internal threads due to an unfavorable choice of process parameters. Drilling out and inserting new threads is - if at all possible - expensive and time-consuming. Therefore, a function-oriented statement regarding the remaining load-bearing capacity when retightening using a new bolt is necessary. However, this is not possible according to the current state of research. The aim of this project is the data-driven functional modeling of bolted joints under uncertain product conditions. For this purpose, a functional modeling of bolted joints is to be carried out in this project. Remanufacturing comprises the disassembly process of a corroded bolt from a corroded thread and a downstream screw-in process of a new bolt into the thread of the remanufactured used part. Process and product data are recorded and a functional model of the bolt connection is derived for reassembly. The result of this project is a validated functional model for predicting functionally relevant variables, namely the load-bearing capacity of the remanufactured bolted joint and the thread friction coefficient during tightening, as well as the method for model development. The resulting functional model is based on existing process knowledge and known models. Subsequently, the functional model will be further developed using the empirical database collected in this project, consisting of process and product data.