Sheet metal bending machine

Abstract

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 (CI, C2, C3, C4) of bending tools suitable to bend a workpiece (50) according to respective defined bending lines; the bending assembly (2) comprises moving means (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-p, one third bending tool (43) having a width of X+3-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-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 and 70 mm, and p is a step between two lengths of subsequent tool compositions (CI, C2, C3, C4), comprised between 5 and 20 mm; the combination of one or adjacent more tools (40, 41, 42, 43, 44) of said set (20) of bending tools allowing obtaining bends having all the lengths starting from a minimum bending length equal to said basic width (X) with said step (p).

Description

technical field [0001] The invention relates to a bending machine arranged to bend and deform strips, sheet metal, metal section bars in order to obtain semi-finished and / or finished products. In particular, the present invention relates to a bending machine having modular and mating punches consisting of a tool holder crosspiece slidably and adjustably secured to the machine. Group bending tools form. The invention also relates to a bending machine provided with a system for automatically changing and / or positioning said bending tools. Background technique [0002] Bending machines are known, also called press brakes, which comprise a mechanically or hydraulically driven press capable of moving an upper tool, called a punch, against a lower tool, called a die, positioning the workpiece on the lower tool. The punch exerts a force on the workpiece that can deform and bend the workpiece according to angles determined by the configuration of the tool itself. [0003] One ty...

AI Technical Summary

Problems solved by technology

[0010] A disadvantage of known bending machine tools is that in order to perform bends with different lengths, it is necessary to change the tool in order to perform a tool combination with the desired length

In order to perform assembly and / or disassembly operations of tools which must be withdrawn and / or placed in magazines, considerable time intervals are necessary during which the machine must be stopped, interrupting production and thereby reducing machine output

[0011] Furthermore, tool changes and / or positioning can only be performed at the beginning of a workpiece operation cycle, not during said cycle

In fact, in this case, the duration of the operating cycle will be too high, reducing the output of the machine

Another disadvantage of the known bending machines is that automatic systems for tool change and assembly are expensive and complex, since gripping and transfer devices are required to assemble and disassemble the bending tools and to withdraw and insert the bending tools into the suitable box

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