| 摘要 |
A bending machine (1) includes a frame (2) that has a punch-side frame section (23) and a die-side frame section (25), a punch holder (8) provided on the punch-side frame section (23), a die holder (10) provided on the die-side frame section (25), a pressing mechanism (3) for pressing a punch (6) toward a die (7), a first deflection detector (11) for detecting a displacement of the punch (6), a second deflection detector (42) for detecting an actual displacement of the punch (6), and a controller (5); and the controller (5) previously stores a relation between a deflection of the frame (2) and a bending length, material and a sheet thickness of a sheet material, calculates an actual deflection of the frame (2) by subtracting a detection value of the second deflection detector (42) from a detection value of the first deflection detector (11), gets a target deflection of the frame (2) for bending a sheet material to be bent based on the relation stored, and controls the pressing mechanism (3) so that the actual deflection becomes consistent with the target deflection. |
