A bending machine for sheet metal comprises a bending assembly (2) provided with a tool holder crosspiece (3) which is mobile and supports a set (20) of bending tools (40, 41, 42, 43, 44) which are aligned, and mutually positionable, along a first longitudinal direction (A) so as to form predetermined compositions (C1, C2, C3, C4) of bending tools suitable to bend a workpiece (50) according to respective defined bending lines; the bending assembly (2) comprises a moving assembly (5, 6) to move the bending tools (40, 41, 42, 43, 44) along the crosspiece (3), the set (20) of bending tools comprises, arranged adjacent and in sequence starting from an end (3a) of said crosspiece (3): four first bending tools (41) having a width of X+p, one second bending tool (42) having a width of X+2.Math.p, one third bending tool (43) having a width of X+3.Math.p, one basic bending tool (40) having a width of X, three third bending tools (43), one fourth bending tool (44) having a width of X+4.Math.p, two basic bending tools (40), one first bending tool (41), one second bending tool (42), a further set (21) of basic bending tools (40), wherein X is a basic width in mm of said basic bending tool (40) comprised between 30 mm and 70 mm, and p is a step between two lengths of subsequent tool compositions (C1, C2, C3, C4), comprised between 5 mm and 20 mm; the combination of one or more adjacent tools (40, 41, 42, 43, 44) of said set (20) of bending tools allows obtaining bends having all the lengths starting from a minimum bending length equal to said basic width (X) with said step (p).

A machine for bending sheet metal provides at least one sheet metal resting tool, at least one sheet metal pressing tool, and at least one sheet metal bending tool, parallel to one another; for moving the tools along a first and a second axis perpendicular to one another at least two electric motors are provided for moving the sheet metal pressing tool along the second axis, at least two electric motors for moving the sheet metal bending tool along the first axis and at least two electric motors for moving the sheet metal bending tool along the second axis; a command and control unit connected to the electric motors commands and controls the driving of the electric motors to maintain the parallelism between the tools in the operating step. In this manner, using hydraulic drives is avoided.

A method for calibrating a metal profile blank configured as a hollow-chamber profile having at least one solid wall. A pressing tool is closed in a main direction about one end region of an element of the profile blank until surfaces of the pressing tool lie against a pair of surfaces of the profile blank to be calibrated, deforming and bending the at least one end region of the element. The pressing tool is closed in a secondary direction perpendicular to the main direction until surfaces of the pressing tool lie against surfaces of the at least one end region, and wedge-like limbs of a drive element of the pressing tool engage wedge-like dies of the pressing tool. The pressing tool is closed further in the secondary direction, subjecting the profile blank to plastic deformation so as to reduce or eliminate the bending of the end region.

The invention relates to a lower tool (1) having a longitudinal-offset measuring device (2), which lower tool (1) is part of a bending tool arrangement for use in a bending press. The lower tool (1) has a tool body (3) having a longitudinal extension (4), in which longitudinal extension (4) a bending recess (5) is provided. The bending recess (5) extends from an upper flat side (6) of the tool body (3) into the latter and is formed at least by two contact surfaces (7). The transition from the upper flat side (6) into the bending recess (5) forms a contact edge (8), which contact edge (8) forms a contact line (9) in the longitudinal extension (4). A sensor (10) for determining a longitudinal offset (18) is arranged in the region of the contact line (9), wherein a sensing portion (11) of the sensor (10) is oriented in the direction of a metal sheet (16) to be bent.

A method for determining the wear properties of coated flat products such as galvannealed flat steel products is provided herein. In order to be able to achieve better comparability of the determined wear properties of different flat products at least one bending parameter for the bending of the particular flat product by a bending device is selected in accordance with defined criteria on the basis of information regarding the thickness and/or the strength of the particular flat products to be bent. The flat products are bent in the bending device in accordance with the selected bending parameters, wear thus being produced. The wear properties are analyzed in a predetermined manner on the basis of the wear of the particular flat products.

A computer controlled method for bending profiles for making insulating frames for double and triple glass pane glazings comprises at least the steps of: automatically feeding the profile to a profile machining section; immediately bringing the profile to a bending position, in which the profile is heated directly by hot air jets to a malleable condition at the bending position without moving the profile in its malleable condition.

A device and a method are provided for shaping sheet metal. The device is provided with a plurality of support and clamping elements which are designed to cooperate with one another so as to clamp the sheet metal for a shaping process by mechanically contacting the sheet metal and by holding, orienting, and/or positioning processes. A plurality of actuators are designed to orient and/or position the plurality of support and clamping elements. A controller for the actuators is designed to control the plurality of actuators for adjusting the orientation and/or position of the support and clamping elements.

The present disclosure relates to a method for determining the bending angle on a bending machine, wherein the bending machine includes an upper tool and a lower tool for reshaping a workpiece by bending along a bending line. One or more measuring arrangements are positioned on the bending machine, which together include at least one illumination device and in each case at least one image acquisition device. Each measuring arrangement is assigned a different surface portion of the workpiece which lies laterally adjacent to the bending line and extends along the bending line. A light pattern is imaged on the workpiece by means of the at least one illumination device of a respective measuring arrangement onto the assigned surface portion. The light pattern contains a plurality of zones which are arranged side by side along the bending line.

A received beam amount acquisition section 60 acquires a received beam amount per unit time of a beam receiver 52 at certain sampling time intervals. A beam shielding detection section 66 detects presence or absence of beam shielding of a monitoring beam B by determining whether or not the acquired received beam amount per unit time of the beam receiver is lower than a determination threshold Th for detecting the presence of beam shielding of the monitoring beam B. A detection sensitivity of the beam shielding detection section 66 is configured to be switched from a normal sensitivity mode to a high sensitivity mode when bending is initial processing based on a predetermined processing program, and an acquired height position of the beam receiver 52 is lower than a predetermined second height position LP2.

A method for a robot to automatically find a bending position, including the following steps: step 1, establishing a gripper tool coordinate system (TX, TY, TZ); step 2, determining a user coordinate system (X.sub.A, Y.sub.A, Z.sub.A; X.sub.B, Y.sub.B, Z.sub.B) of rear blocking fingers (11, 21); step 3, a robot gripper moving horizontally, and detecting the state of sensors (12, 22); step 4, the robot gripper executing a rotational movement, detecting the state of the sensors (12, 22), and thereby obtaining a standard bending position. The robot automatically finds the bending position, the teaching difficulty is reduced, and the bending quality is increased. In the elevator industry, elevator door plate bending sizes are the same, but forming sizes are different. In the present invention, only one product process needs to be taught in order to satisfy elevator door plate processing with different specifications, thereby reducing maintenance costs and increasing production efficiency.