To provide a control data preparation method for a pressing through bending machine capable of realizing bending in conformance with design as much as possible in addition to conventional bending.
Respective local coordinate systems xy specified based on a fixed die of a pressing through bending machine are set in respective cross sections 65a-65g of a long size product 51. Based on adjoining local coordinate systems xy, a specific twisting angle around axis per unit feed quantity specified in the axial direction of the long size product 51 is calculated. Based on the calculated specific twisting angle around axis. The relative rotation angle around axis between a fixed die and a moving die of the pressing through bending machine relatively rotating around axis is calculated. Based on the relative rotation angle around axis derived in this way, the rotation of the fixed die and the moving die of the pressing through bending machine around axis is controlled, thus twisting deformation is applied to the long size stock in a relatively high precision.
MARUYAMA MANABU
MEGURI HIDEO
KAGEYAMA YOSHIHIRO
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