US 5,839,310 A · Press brake

Abstract

For starting bending of a workpiece, a provisional drive end for a ram is computed from information such as processing conditions for the workpiece input through a processing (condition input section and the relationship between the target bending angle for the workpiece and the springback angle of the workpiece stored in a springback data section. The ram is driven to the provisional drive end and then the bending angle of the workpiece is measured thereat by an angle measuring unit. Thereafter, a final drive end for the ram is obtained from (i) the measured bending angle, (ii) the relationship between the bending angle of the workpiece and the amount of driving the ram stored in a bending angle vs. driving amount data section, and (iii) the relationship between the target bending angle for the workpiece and the springback angle of the workpiece stored in a springback data section. The ram is driven to the final drive end thus obtained to complete the bending operation.

Claims17

Dependent claims

A press brake for bending a workpiece with an upper die and a lower die that is arranged in opposing relationship with the upper die, the press brake comprising:

(a) memory means for storing information including (i) processing conditions for the workpiece, (ii) a relationship between a target bending angle for the workpiece and a springback angle of the workpiece and (iii) a relationship between a bending angle of the workpiece and an amount of driving a moveable one of the upper and lower dies;
(b) bending angle measuring means for measuring the bending angles of the workpiece during a bending process;
(c) drive end computing means for computing a provisional drive end for the movable die based on said information stored in said memory means and for computing a final drive end for the movable die based on the bending angle of the workpiece measured at the provisional drive end by said bending angle measuring means and based on said information stored in said memory means;
and
(d) die driving means for driving the movable die to the final drive end after driving the movable die to the provisional drive end.

2 more elements

A press brake for bending a workpiece with an upper die and a lower die that is arranged in opposing relationship with the upper die, the press brake comprising:

(a) memory means for storing information including (i) processing conditions for the workpiece, (ii) a relationship between a target bending for the workpiece and a springback angle of the workpiece, and (iii) a relationship between a bending angle of the workpiece and an amount of driving a movable one of the upper and lower dies, (iv) a preset final drive end for the movable die, and (v) an angle measuring point indication value indicating at what angle the bending angle of the workpiece is to be measured before a target drive angle is reached;
(b) bending angle measuring means for measuring the bending angles of the workpiece during a bending process;
(c) drive end computing means
for computing the target drive angle based on the processing conditions for the workpiece and the relationship between the target bending angle for the workpiece and the springback angle of the workpiece, said pieces of information being stored in the memory means,
for computing a provisional drive end for the movable die based on the target drive angle, the angle measuring point indication value, the preset final drive end and the relationship between the bending angle of the workpiece and the driving amount for the movable die, and
for computing a final drive end for the movable die based on the bending angle of the workpiece measured at the provisional drive end by the bending angle measuring means, the relationship between the target bending a angle for the workpiece and the springback angle of the workpiece and the relationship between the bending angle of the workpiece and the driving amount for the movable die;
and
(d) die driving means for driving the movable die to the final drive end after driving the movable die to the provisional drive end.

5 more elements

Dependencies are inferred from the claim text.

Press brake

Life of this patent

Press brake

Life of this patent

Abstract

Claims17