Abstract: When a sheet metal is sandwiched between a punch held by a punch holder and a die held by a die holder to bend the sheet metal at a set bending angle by moving the punch toward the die, a stroke calculation unit calculates a stroke of the punch for bending the sheet metal at the bending angle in consideration of a spring back amount of the bent sheet metal. A bending load calculation unit calculates a bending load required to bend the sheet metal at the bending angle. A punch deflection amount calculation unit calculates a punch deflection amount according to the bending load. A punch holder deflection amount calculation unit calculates a punch holder deflection amount according to the bending load. A depth value calculation unit calculates a depth value by adding at least the punch deflection amount and the punch holder deflection amount to the stroke.

Abstract: A mold for a press brake includes an upper mold that is mountable on an upper table and a lower mold mountable on a lower table in a press brake. The upper mold and the lower mold vertically face each other and have respective pressurizing surfaces. The respective pressurizing surfaces are superposed with each other in a pressing direction so as to define a wedge shaped recess between the respective pressurizing surfaces. The respective pressurizing surfaces are configured to pressurize a workpiece positioned between the respective pressurizing surfaces. Further, one of the pressurizing surfaces is formed as a level surface and the other is formed as an inclined surface. The upper mold includes a V-shaped workpiece bending portion that can freely enter into a bending groove provided in the lower mold, and the respective pressurizing surfaces are positioned outside of the bending groove of the lower mold.

Abstract: When a sheet metal is sandwiched between a punch held by a punch holder and a die held by a die holder to bend the sheet metal at a set bending angle by moving the punch toward the die, a stroke calculation unit calculates a stroke of the punch for bending the sheet metal at the bending angle in consideration of a spring back amount of the bent sheet metal. A bending load calculation unit calculates a bending load required to bend the sheet metal at the bending angle. A punch deflection amount calculation unit calculates a punch deflection amount according to the bending load. A punch holder deflection amount calculation unit calculates a punch holder deflection amount according to the bending load. A depth value calculation unit calculates a depth value by adding at least the punch deflection amount and the punch holder deflection amount to the stroke.

Abstract: According to a laser cutting method, a processed part is laser-cut so that the processed part doesn't drop off from a sheet-shaped workpiece. In the laser cutting method, a cut slit of a pressing protrusion, which is curved due to a laser cutting process along an outline of the processed part and then presses a peripheral surface of the processed part, is preliminarily formed around the processed part to be cut out from the workpiece. Then, the laser cutting process is carried out along the outline of the processed part. The pressing protrusion curves toward the processed part due to the laser cutting process of the processed part, and then the processed part is retained by the pressing protrusion.

Abstract: A mold for a press brake includes an upper mold that is mountable on an upper table and a lower mold mountable on a lower table in a press brake. The upper mold and the lower mold vertically face each other and have respective pressurizing surfaces. The respective pressurizing surfaces are superposed with each other in a pressing direction so as to define a wedge shaped recess between the respective pressurizing surfaces. The respective pressurizing surfaces are configured to pressurize a workpiece positioned between the respective pressurizing surfaces. Further, one of the pressurizing surfaces is formed as a level surface and the other is formed as an inclined surface. The upper mold includes a V-shaped workpiece bending portion that can freely enter into a bending groove provided in the lower mold, and the respective pressurizing surfaces are positioned outside of the bending groove of the lower mold.

Abstract: To provide a mold for a press brake in which an ascending and descending member that is relatively pressed and lowered by an upper table in a press brake is provided vertically movably with respect to a mold base mountable on a lower table in the press brake, an upper surface of a workpiece supporting member provided in the mold base and a lower surface of a workpiece pressing member provided in the ascending and descending member vertically face each other, and the upper surface of the workpiece supporting member is inclined so that a front side thereof becomes relatively lower than the lower surface of the workpiece pressing member.

Abstract: According to a laser cutting method, a processed part is laser-cut so that the processed part doesn't drop off from a sheet-shaped workpiece. In the laser cutting method, a cut slit of a pressing protrusion, which is curved due to a laser cutting process along an outline of the processed part and then presses a peripheral surface of the processed part, is preliminarily formed around the processed part to be cut out from the workpiece. Then, the laser cutting process is carried out along the outline of the processed part. The pressing protrusion curves toward the processed part due to the laser cutting process of the processed part, and then the processed part is retained by the pressing protrusion.

Abstract: A machine tool for bending a workpiece by clamping the workpiece with a die and a punch is configured to: distinguish a material characteristic of the workpiece as an actual value and a nominal value; determine an actual material characteristic during an machining operation and re-calculate an operation target value suitable for the workpiece; and bend the workpiece by operating the punch in accordance with the suitable operation target value thus re-calculated.

Abstract: A method for bending a flat workpiece is provided. The method may include applying heat or pressure to the workpiece at a range within a first width from an edge with a residual stress formed by cutting so as to reduce the residual stress, and bending the workpiece along a bending line after applying the heat or pressure.

Abstract: A device for regulating a residual stress is comprised of: input means; a residual stress database; a process condition database; first searching means for searching a residual stress (?0) from the residual stress database; a calculator for calculating a first bending moment (Mrs) in a ridge line originated from the residual stress, and a second bending moment (Mz) in the ridge line originated from bending to obtain a total bending moment (Mrs?Mz) and calculating a camber curvature (?z) of the workpiece originated from the total bending moment (Mrs?Mz); comparing a difference (|?z??z0|) between the camber curvature (?z) and a target value (?z0) with a tolerable value (?); second searching means for searching a process condition satisfying a tolerable condition (|?z??z0|??) from the process condition database when (|?z??z0|>?); and regulating means for regulating a residual stress.

Abstract: To provide a mold for a press brake in which an ascending and descending member that is relatively pressed and lowered by an upper table in a press brake is provided vertically movably with respect to a mold base mountable on a lower table in the press brake, an upper surface of a workpiece supporting member provided in the mold base and a lower surface of a workpiece pressing member provided in the ascending and descending member vertically face each other, and the upper surface of the workpiece supporting member is inclined so that a front side thereof becomes relatively lower than the lower surface of the workpiece pressing member.

Abstract: A machine tool for bending a workpiece by clamping the workpiece with a die and a punch is configured to: distinguish a material characteristic of the workpiece as an actual value and a nominal value; determine an actual material characteristic during an machining operation and re-calculate an operation target value suitable for the workpiece; and bend the workpiece by operating the punch in accordance with the suitable operation target value thus re-calculated.

Abstract: A sheet material processing apparatus has a pressurizing part of a sheet material and a supporting part of the pressurized sheet material. The apparatus includes an end face pressing upper press die that receives a pressurizing force, an end face pressing lower press die that is arranged on the supporting part and faces the end face pressing upper press die so that an end face of the sheet material is inserted between the end face pressing upper and lower press dies, an end face pressing part that, with the end face pressing upper press die being moved toward the end face pressing lower press die, presses the end face of the sheet material, and an end face pressing width adjusting part that sets a pressing width of the end face of the sheet material.

Abstract: A device for regulating a residual stress is comprised of: input means; a residual stress database; a process condition database; first searching means for searching a residual stress (?0) from the residual stress database; a calculator for calculating a first bending moment (Mrs) in a ridge line originated from the residual stress, and a second bending moment (Mz) in the ridge line originated from bending to obtain a total bending moment (Mrs?Mz) and calculating a camber curvature (?z) of the workpiece originated from the total bending moment (Mrs?Mz); comparing a difference (|?z??z0|) between the camber curvature (?z) and a target value (?z0) with a tolerable value (?); second searching means for searching a process condition satisfying a tolerable condition (|?z??z0|??) from the process condition database when (|?z??z0|>?); and regulating means for regulating a residual stress.