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US 6,145,366 AGranted
Ram control method and ram control system for press brake
AssigneesKomatsu Ltd., Komatsu Industries Corporation
InventorYukihiro Yamada
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AssigneesKomatsu Ltd., Komatsu Industries Corporation
InventorYukihiro Yamada
Estimating the term…
Damage to the dies due to a die collision caused by an input error of bending data etc. is avoided without use of a specialized device for pressure detection. A die interference checking mode is provided for setting the pressure of the ram, which supports the movable die, to a value that does not cause damage in the event that the movable die and the fixed die interfere with each other and for driving the ram so as to create the set pressure. A die interference determining step is further provided in which it is determined whether the movable die and the fixed die have interfered with each other in the die interference checking step, and if it is determined that the dies have interfered, the movement of the ram is stopped, and if it is determined that the dies have not interfered, the die interference checking step is cancelled and the operation of the press brake proceeds to an ordinary bending step.
A ram control method for a press brake which bends a sheet-like workpiece by the cooperative movement of a movable die and a fixed die, the movable die being supported and driven by a ram, while the fixed die being supported on a fixed bed in opposing relationship with the movable die,
A ram control system for a press brake which bends a sheet-like workpiece by the cooperative movement of a movable die and a fixed die, the movable die being supported and driven by a ram, while the fixed die being supported on a fixed bed in opposing relationship with the movable die,
A ram control system for a press brake which bends a sheet-like workpiece by the cooperative movement of a movable die and a fixed die, the movable die being supported and driven by a ram, while the fixed die being supported on a fixed bed in opposing relationship with the movable die,
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Bending sheet metal along straight lines, e.g. to form simple curves: on press brakes without making use of clamping means
Characterised by monitoring or safety: avoiding collision or forbidden zones
Working or processing of sheet metal or metal tubes, rods or profiles
Control or regulating systems in general
Term ended 24 May 2019 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a ram control method and ram control system for use with a press brake which bends a sheet-like workpiece by the cooperative movement of a movable die and a fixed die, the movable die being supported and driven by a ram, while the fixed die being supported on a fixed bed in opposing relationship with the movable die.
When using dies under pressure more than an allowable value in a press brake, there is the risk of breakage which is very dangerous for the operator. Therefore, press brakes of the above type are generally provided with an overload protector which restricts the pressure of the ram for driving the movable die so as not to exceed an allowable value.
One of conventional overload protectors is disclosed in Japanese Patent Publication (KOKAI) Gazette No. 6-154871 (1994) according to which the pressure applied between the upper and lower dies is detected and if it is determined from the detected value that an abnormal condition or overload condition has occurred, the press brake is brought to an emergency stop.
FIGS. 1 to 7 are associated with a first embodiment of the invention.
FIG. 1 is a front view of a press brake.
FIG. 2 is a side view of the press brake.
Referring now to the drawings, the ram control method and ram control system for a press brake of the invention will be described according to preferred embodiments.
(First Embodiment)
FIGS. 1 and 2 are a front view and a side view, respectively, of a press brake constructed according to the first embodiment of the invention. FIG. 3 shows the control system structure of the invention.