Structural carbon fiber reinforced plastic parts are usually manufactured through autoclave processing for high-performance aerospace applications. Today’s aerospace composite manufacturing techniques require high quality with robust manufacturing processes. Manufacturing process simulation enables the investigations of physical effects and manufacturing process mechanisms. This approach has been increasingly used to predict and optimize the manufacturing process for high part quality at low manufacturing costs. Owing to a complicated manufacturing environment involving multi-physics characteristics, there is a critical need to develop an efficient and cost-effective numerical methodology with a systematic study. This thesis contributes to the systematic investigations of the process modeling, simulation, thermal measurement, and optimization in composite manufacturing of autoclave processing. The method provides a correct and efficient thermal analysis and optimization in autoclave processing to achieve better process control and ensure the quality of composite parts. The presented framework can be applied directly in autoclave production with larger dimensions and full-scale tools for aerospace structures. The developed methodology allows quick delivery guidelines of production plans and optimization strategies for composite manufacturing in a highly useful and cost-effective way, thereby reducing the cost in the design and manufacturing phase.
Junhong Zhu Books


Due to increasing market demands for customized small-scale production and prototyping, Roboforming (robot-based incremental forming) has been developed for quick, precise, and dieless sheet metal forming. In this process, two KUKA robots hold forming and supporting tools with a universal ball-sized structure. The sheet is clamped in a fixture frame, and both robots are synchronized via a robot controller. The final shape of the workpiece is generated by the movement of the forming tool laterally and its gradual infeed depth-wise. The movable supporting tool enhances process accuracy and flexibility by eliminating the need for structure-specific dies. This work aims to develop a CAx-chain in Roboforming, encompassing CAM and CAE for tool path generation and process simulation. Unlike traditional forming processes, Roboforming replaces dies with a universal forming tool and a long trajectory, shifting focus from die production to effective tool path generation in Asymmetric Incremental Forming (AISF). A specialized CAM system is crucial for accommodating various forming strategies. While using a robot system with synchronized tools reduces investment costs and increases flexibility, it complicates path generation due to the lack of mature CAM solutions. The developed CAM solution can export files for the robot control system and support different forming strategies. Following the CAM process, a CAE model is created for robot