A since the machine configurations did not allow the

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Unformatted text preview: ted by: (a) (b) Factors Influencing Dimensional Accuracy of Bent Parts 345 m h j ∆G X = ∆G X + ∆G X + ∆G X, g . (4) 3- Bend allowance error ∆BA represents the discrepancy between the bend model used and the actual material behaviour. 4- Tool positioning error in X direction ∆X P . Thus, taking into account all the errors, the achievable lengths of the bend legs can be expressed as a function of nominal dimensions and the influencing errors as follows: LG = L0 + (∆ G X + 1 2 ∆ B A − ∆ X P ) G 0 LR = LR + (∆ LU − ∆ G X + 1 2 ∆ B A + ∆ X P ) (5) 2.3. Sensitivity analysis Equations (2) and (5) represent the quantities of interest, namely the bend angle and the bend length, as functions of various factors, which can be rewritten as: α = f α (V , X P , YP , s, ζ ) (6) According to [GUM, 1992], these quantities can be estimated by: α = α 0 + ∆α ± 2uc (α ) (7) L = L0 + ∆L ± 2u ( L) c where ∆α and ∆L are the correctable systematic errors of α and L ; u...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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