Abstract: “From the recent decade, Single Point Incremental Forming (SPIF) [1] has been a new forming sheet technology in industry. However, there are a few of studies in theoretical researches and the formulas of stresses of formed sheet in [2] could not convince the mechanic of breaking of the workpiece sheet. In this paper, we proposed a new computation in pure analytics of normal stresses that are based on the strains and stresses of Ludwig‟s formula. The formulas of stresses are in accordance with the mechanics of breaking sheet and are mentioned in [4]. The paper displays also the computation of forming forces, torques and consumption power. The analytical results are partly compared to the result of simulation and experiment with a small difference that proves the reliability of the formula. The proposed results of this paper could assist technicians to select suitable SPIF machine, tools to a given workpiece sheet material machine to avoid out of order when forming sheets by SPIF technolo”

Keywords: Single Point incremental Forming (SPIF), normal stresses, strains, simulation, consumption power, analytical formula.