Details

Autor(en) / Beteiligte

• Xiao, Xiao
• Kim, Chan-Il
• Lv, Xiao-Dong
• Hwang, Tae-Seog
• Kim, Young-Suk

Titel

Formability and forming force in incremental sheet forming of AA7075-T6 at different temperatures

Ist Teil von

• Journal of Mechanical Science and Technology, 2019, 33(8), , pp.3795-3802

Ort / Verlag

Seoul: Korean Society of Mechanical Engineers

Erscheinungsjahr

2019

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• The AA7075-T6 sheet recently received attention, owing to its low weight and strength for use fabricating automotive parts (e.g., body, motor case). Owing to its low ductility and high strength at room temperature, it is difficult to form; a heating process is required. In this paper we investigate the mechanical properties of a 1.0-mm-thick AA7075-T6 sheet at different temperatures via an uniaxial tensile test, examining the forming characteristics of incremental sheet forming (ISF) at different temperatures. In the ISF experiment, a sheet clamped on a fixed die was heated and maintained at the designed temperature. The forming force was measured by an in situ force monitoring system. The forming parameters included tool diameter, vertical step, temperature, and feed speed. Vertical step and temperature were selected at three levels for experimental design. The formability was evaluated by varying the shapes of wall-angle conical frustums. When the temperature increased to 200 °C, the formability increased dramatically. The fracture-forming limit curve in ISF was defined for this material at different temperatures. This fracture criterion was loaded into ABAQUS software to predict fracture. The comparison between experimental and finite-element method simulation shows good agreement.