Bending method and bending apparatus

Details Bending method and bending apparatus Bending method and bending apparatus

1998-08-10

1999-12-21

Hail, III, Joseph J.

Metal deforming

With indication of condition or position of work, product,...

Work drawn or extruded through die

72 153, 72 173, 72 37, 72702, B21C 5100

Patent

active

060033533

ABSTRACT:
For the purpose of making it possible to estimate the spring back angle and/or final driving position of the driving die with good accuracy even if there are some variations from lot to lot in the material characteristics values, and thereby achieve bending with extremely high angle accuracy, the actual bending angle is directed at no less than two provisional driving positions of the driving die during the bending of a workpiece. Based on the relationship of the amount of change in the driving amount to the amount of change in the actual bending angle relating to those provisional driving positions, a determination is made of the relationship of the spring back angle to the target bending angle of the workpiece for the respective working conditions of the bending concerned which are stored in advance. From this relationship, a determination is made for the final driving position of the driving die, and the driving die is driven to that determined final driving position.

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