The rolls are classified into two types; one is a single-solid roll, and the other is a shrink-fitted sleeve roll consisting of a sleeve and a shaft. Regarding the shrink-fitted sleeve roll, the interfacial creep sometimes appears between the shaft and the shrink-fitted sleeve. In previous studies, the numerical simulation was performed to realize the interfacial slip. However, the validity of the simulation has not been confirmed yet experimentally. In this paper, therefore, the rolling experiment is conducted by using a miniature rolling mill. Then, the slip distance and the displacement increase rate obtained in the experiment are compared with the simulation results. The experimental values and the simulation values are qualitatively consistent. The total length of the slip defects observed on the surfaces of the sleeve and the shaft coincides with the slip length. The three-dimensional geometry of the defect is identified.

Additive manufacturing technology is being researched and developed not only for prototyping, but also for various application areas. The authors have been researching additive manufactured violins. In this study, four design goals for the additive manufactured violin were defined. Then, a process of design, manufacturing, and evaluation to achieve the design goals was constructed, employing 3D scanning, 3D-CAD, and CAE. Several parts of the constructed process were implemented to create 3D-CAD models of a violin. One of the design configurations for the additive manufactured violin was found that might achieve the four design goals using the 3D-CAD model.

In the 1st report, the design goals for additive manufactured violin were defined, and a process for achieving the design goals was established. Then, parts of the process were implemented and one of the design configurations of the violin was found that might achieve the design goals. In this study, a violin based on the design configuration was fabricated using three additive manufacturing systems. The violin was evaluated through parts of the process. As a result, an additive manufactured violin was obtained that achieved the design goals.