13th International Conference on the Technology of Plasticity (ICTP 2021): Metal Forming Process II
Program Organizers: Glenn Daehn, Ohio State University; Libby Culley, The Ohio State University; Anupam Vivek, Ohio State University; Jian Cao, Northwestern University; Brad Kinsey, University of New Hampshire; Erman Tekkaya, TU Dortmund; Yoshinori Yoshida, Gifu University

Tuesday 9:15 AM
July 27, 2021
Room: Virtual: Room E
Location: Virtual

Session Chair: Hiroshi Utsunomiya, Osaka University


Forming of PMMA Sheets by Lap Incremental Forming with Local Friction Heating: Masaaki Otsu1; Keita Tanaka1; Takuya Miura1; Masato Okada1; 1University of Fukui
    A new forming method for PMMA sheets using friction stir incremental forming was proposed. In this method, A5052 sheets, A1050 sheets and PMMA sheets are overlapped and formed simultaneously. PMMA sheets which size was 185 mm x 185 mm and thickness were 0.5, 0.2 and 2 mm were employed for specimens. A hemispherical tool with a diameter of 6 mm was used. The tool was rotated at 6000 - 12000 rpm and moved at 1000 - 4000 mm/min. Sheets were formed into a frustum of conical shape with the height of 40 mm and wall angles of 45° - 65°. Shape of formed sample was measured and compared with the objective shape. From the experimental results, formed sheet surface roughness was Ra = 4.45 μm and Rz = 25.89 μm. The limit of formable wall angle was 60°.

Research of Press Forming of CFRTP under the Control of a Distribution of Temperature and Blank Holder Force: Michihiko Hoshino1; Yoshinori Nagai2; 1Nihon University; 2Tamagawa University
    In recent years, industry field has an increasing demand for high strength and lightweight carbon fiber reinforced plastics (CFRP). Furthermore, next request is reduction of forming time. But carbon fiber reinforced thermosetting resin (CFRTS) that is commonly used can not shortening molding time any more. For the purpose of shortening molding time and reducing production cost, carbon fiber reinforced thermoplastics (CFRTP) has been researched. CFRTP does not require chemical reactions to molding. So it is possible for CFRTP to shorten molding time. In this study, the purpose is reduction of molding time by application press forming for CFRTP. By fundamental experimental results, it is clear that non-uniform temperature is distributed over blank in hot press forming and there is porosity in some forming condition. By optimizing a distribution of temperature and blank holder force, formability of CFRTP could be improved.

Research Progress on Advanced Forming and Performance Strengthening of Complex Thin-walled Aluminum Alloy Components: Yanli Song1; Lin Hua1; Jue Lu1; Pu Zhou1; Wenlin Wu1; 1Wuhan Universtiy of Technology
     Aluminum alloy is the most potential lightweight material, which has been widely used in aviation, aerospace, automobile, high-speed rail and so on. Advanced forming and performance strengthening methods of complex thin-walled Aluminum alloy components have been the focus of international research. In this paper, the latest research progress in the field of forming and performance strengthening of aluminum alloy sheets and components is reviewed, including isothermal tensile deformation behavior, constitutive equations, processing mapping, friction and wear behavior at high temperature, dynamic strain aging and electromagnetic shocking treatment(EST).Then the technical difficulties and development trend of aluminum alloy forming manufacturing are discussed.

Friction Based Solid State Recycling: An Industry-ready Technology?: Abdul Latif1; Gianluca Buffa1; Giuseppe Ingarao1; Livan Fratini1; 1University of Palermo
    Conventional recycling routes for aluminum alloys, based on remelting, are not efficient in terms of energy demand and, what is more, permanent material losses occur because of oxidation. In order to overcome such issues, researches have turned to Solid State Recycling (SSR) strategies, directly turning aluminum scraps into semi-finished products by avoiding the remelting step. Within this process category the authors have focused on friction based SSR methods. In these processes, the work of the friction forces between the die and the material being processed decays into heat causing material softening, thus allowing solid bonding activation. In the proposed presentation the authors will discuss strengths and weaknesses of two process variants: Friction Stir Extrusion and Friction Stir Consolidation. Process mechanics, process engineering (both experimental and numerical) and potential environmental savings will be presented along with the knowledge gap to be still covered to get these processes suitable for industrial applications.