To a fulcrum roll unit portion in a workpiece, a corresponding initial curvature radius is applied, and to a bending roll unit portion in a workpiece, a corresponding design curvature radius is applied. To an intermediate unit portion in a workpiece, an intermediate curvature radius set so as to continuously change from the initial curvature radius to the design curvature radius is applied. At least one of the fulcrum roll and the bending roll is moved on the basis of an integrated value obtained by integrating the amount of change in bending position in each of the intermediate unit portion and the bending roll unit portion.

The invention relates to a method for operating a bending press (10), wherein the bending press (10) comprises a first platform (1) with a first tool mount (11) and a second platform (2) with a second tool mount (12), wherein one of the platforms (1) is movable relative to the other platform (2) for performing a working movement, a safety device (20) for creating a light barrier (27), in particular laser light barrier, extending between the tool mounts (11, 12) transversely to the working movement of the movable platform (1), which light barrier (27), in a cross-section, forms a light field (7), wherein the safety device (20) has a first mount (21), which carries a light emitter (25) for creating the light barrier (27), and a second mount (22), which carries a light receiver (26) for receiving the light of the light barrier (27), and wherein the first mount (21) is arranged on a first side of the first platform (1) and is adjustable relative to the first platform (1) by a first adjustment drive (23), such that the position of the light barrier (27) relative to the first tool mount (11) can be changed in the direction of the working movement of the movable platform (1), a controller (9) that is connected to the first adjustment drive (23), characterized in that
before a bending operation or a series of bending operations, the controller (9) brings the first mount (21) into a working position by controlling the first adjustment drive (23), in which working position the tool tip (4) of a bending tool (8) held by the first tool mount (11) lies within the light field (7) formed by the light barrier (27).

A method for selecting optimum operation performance criteria for a metal working process. The method includes the step of developing a process model relating process parameters for the operation with performance variables for said operation, wherein the process parameters and performance variables are retrievable via integrated multiple data sources, and selecting at least one optimization technique to define a function, said function including process parameters. Moreover, the method includes generating the function for optimization by using acceptable tolerances of a product to be machined as a basis to define ranges for performance variables along with ranges for process parameters, and applying the at least one optimization technique to said function, whereby optimum operation performance criteria are calculated for the process model including process parameters and performance variables to obtain a set of requirements to be used for controlling the metal working process.

A folding device for bending a workpiece made of flat material. The folding device includes a machine frame having a flat mounting surface, at which a clamping cheek is arranged, which can be moved relative to the mounting surface. The clamping cheek clamps a workpiece which is positioned on the mounting surface at a specified or specifiable mounting position, to the machine frame. A bending means, of at least one bending tool can be moved relative to the mounting surface so that the clamped workpiece can be bent around a certain bending angle, is furthermore arranged at the folding device. A machine controller is coupled to a cutting tool drive of a cutting tool for cutting the workpiece and which for performing a cutting process for severing a workpiece which is smaller than a distance between the start position and the end position with respect to the bending axis.

An automated method and machine for fabricating metal fence pickets in a single operation includes forming material, typically metal strip into multiple pickets with various shapes. The machine includes automated programmable machine for inserting raw material to form the metal fence pickets, automated programmable machine for embossing the metal fence pickets, automated programmable conveyor machine for conveying the raw material, automated programmable machine for cutting, punching holes, and folding the raw material to form the metal fence pickets.

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.

To a fulcrum roll unit portion in a workpiece, a corresponding initial curvature radius is applied, and to a bending roll unit portion in a workpiece, a corresponding design curvature radius is applied. To an intermediate unit portion in a workpiece, an intermediate curvature radius set so as to continuously change from the initial curvature radius to the design curvature radius is applied. At least one of the fulcrum roll and the bending roll is moved on the basis of an integrated value obtained by integrating the amount of change in bending position in each of the intermediate unit portion and the bending roll unit portion.

A high-precision heavy-load numerically-controlled flanging machine comprises a machine frame, an edge pressing assembly, a flanging beam and a flanging beam transmission mechanism that comprises an inclined slide rail, an inertia block and two crank-connecting rod mechanisms; the flanging beam is provided with a driving inclined plane; the inclined slide rail is mounted on the machine frame; the inertia block is provided with two non-parallel inclined planes, wherein one inclined plane of the inertia block is slidably mounted on the inclined slide rail to form a sliding pair I, and the other inclined plane of the inertia block is in sliding fit with the driving inclined plane of the flanging beam to form a sliding pair II; cranks of the two crank-connecting rod mechanisms are hinged on the machine frame.

A precision compensation mechanism of a full-automatic bidirectional flanging machine comprises an upper die X-direction fine adjustment assembly, an upper die Y-direction fine adjustment assembly, a lower die X-direction fine adjustment assembly and a lower die Y-direction fine adjustment assembly, wherein the fine adjustment assemblies each comprise N adjusting threaded sleeves, N adjusting screws and a threaded sleeve rotation driving device; wherein the N adjusting threaded sleeves are threaded into an upper opening or a lower opening of a C-shaped flanging beam along the length direction of an upper die or a lower die; the outer wall surfaces of the N adjusting threaded sleeves are threaded into the upper opening or the lower opening of the C-shaped flanging beam to form N screw thread pairs I with the thread pitch of P1.

A method for curving an elongated piece uses a digital system which includes a control console having a programmable processing unit and a screen for displaying data and a camera connected with the processing unit and configured and positioned for acquiring images of the elongated piece. In accordance with the method, the profile of at least one virtual template of curvature is stored in the processing unit and a real image of the elongated piece is detected. The profile of the virtual template and the real image of the elongated piece are reproduced and compared in real time. The roller curving machine is driven and the curvature and the geometric configuration of the elongated piece are matched with the profile of the virtual template of curvature.