The samples were numbered in random order the first

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Unformatted text preview: e line; YP is the Y coordinate of the punch tip, with ∆YP as the error of punch displacement in Y direction as compared to the intended value YP0 ; and s is the sheet thickness, with ∆s as the error of sheet thickness as compared to the ideal thickness s 0 . All angles are measured in radians, and all lengths are measure in mm. Therefore, (1) can be rewritten as: V V + ∆X P − ∆X P −1 2 −1 2 (2) α = tan + tan −ζ Y +s Y +s P P Y Y G j,g g k i OS L’R LU X MS L’G g j ∆ XP V ∆YP ∆ G Xh Y o P YP G ∆ G Xm G0 αF αF o αB o αB X ∆GX0 Figure 2: Analytical models for (a) bend angle and (b) bend lengths b- Bend length. Each bending operation results in two bend lengths. The first length LG is formed between the bend line and the backgauge, the other length LR is the residual length of the unfolding LU at the other side of the bend line, as seen in Figure 2.b. The relation between the dimensions before and after bending is expressed by (3), where LU is the unfolded length, and BA is the bend allowance: (3) LU = LR + LG − BA , or LR = LU − LG +...
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