Abstract:
Single point incremental sheet forming (SPISF) technique is an emerging process for die
less forming. It has wide applications in many industries viz. automobile and medical
bone transplants. Among several key parameters, toolpath planning is one of the critical
aspects of SPISF. Also, formability and geometric accuracy have been the two major limitations in SPISF. Spiral and constant incremental toolpaths and their variants have been
investigated in detail by several researchers. Fractal-based toolpath planning is also an
attempt to improve the process of SPISF. Formability is measured in terms of thickness
distribution and maximum forming depth achieved. This paper investigates a fractal
geometry-based incremental toolpath (FGBIT) strategy to form a square cup using incremental sheet forming (ISF). Fractal toolpath is a space-filling toolpath which is developed by the fractal geometry theory. A comparison-based study is conducted to observe
the benefits of using FGBIT over traditional toolpaths (spiral and constant Z). Better
formability, stress, and thickness distribution have been observed by adopting the proposed toolpath strategy. This toolpath strategy is new in its kind and has not been investigated in the metal forming domain. Experiments and simulations are conducted to
validate the concept with reasonable accuracy.
