Bending machine for bending workpieces, in particular a press brake

Patent metadata

Field	Value
Publication number	US-12097550-B2
Application number	US-202218287000-A
Country	US
Kind code	B2
Filing date	Apr 14, 2022
Priority date	Apr 15, 2021
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A bending machine for bending workpieces is disclosed. The bending machine includes a lower beam and an upper beam for forming a workpiece by bending along a bending line. A tool holder for receiving bending tools is provided on the lower beam and each end of the tool holder is associated with a recessed region which is formed in the lower beam overlapping with the respective end. The lower beam includes a central element and at least one side element arranged adjacent to one another in the thickness direction of the lower beam. Recessed regions are provided in the central element and/or in the width direction adjacent to the central element. The lower beam also includes a central region in which, during a bending operation of a workpiece, a force is introduced via the tool holder both into the central element and into the at least one side element.

First claim

The invention claimed is:

1. A bending machine for bending a workpiece, the bending machine comprising a lower beam and an upper beam, for forming the workpiece by bending along a bending line which extends in a width direction of the bending machine, wherein a tool holder for receiving bending tools is provided on a lower beam, and each end of the tool holder lying in the width direction is associated with a recessed region formed in the lower beam and overlapping with the respective end of the tool holder, wherein:
the lower beam comprises a plate-shaped central element and at least one plate-shaped side element, wherein the plate-shaped central element and the at least one plate-shaped side element are arranged adjacent to one another in a thickness direction of the lower beam, wherein the recessed-region is provided in the central element and/or in the width direction adjacent to the central element;
the lower beam comprises a central region below a central portion of the tool holder in the width direction, wherein the tool holder in the central region contacts both the central element and the at least one side element, thereby during a bending operation of the workpiece a force is introduced via the tool holder in the central region both into the central element as well as into the side element;
the lower beam comprises, for each of the ends of the tool holder, a free region which extends beneath the tool holder originating from each of the ends of the tool holder and comprises portions of the recessed regions associated with each of the ends which lies beneath the tool holder;
the central element and the at least one side element are arranged in a respective one of the free regions in such a manner that the upper edge of the at least one side element is arranged lower than the upper edge of the central element above it, thereby in the respective free region, during a bending operation of the workpiece, at least initially, the force is introduced exclusively into the central element.

2. The bending machine according to claim 1 , wherein the central portion of the tool holder is symmetrically arranged between each of the ends in the width direction and/or occupies at least 50% of a total length of the tool holder in the width direction.

3. The bending machine, according to claim 1 , wherein a respective one of the free regions adjoins the central region of the lower beam on each side in the width direction.

4. The bending machine according to claim 1 , wherein the recessed regions comprise one or more cleared regions in which no material of the central element is located.

5. The bending machine according to claim 1 , wherein at least one of the recessed regions, as seen in a plan view of the lower beam, extends downwardly from a portion of the central element located at an upper edge of the central element and at which no tool holder is arranged and extends into a free region of the lower beam.

6. The bending machine according to claim 1 , wherein the central element is mechanically connected to the at least one side element in the central region of the lower beam, wherein the mechanical connection is a substance-to-substance bonded connection, a welded connection, and/or wherein the mechanical connection extends along the total length of the central region in the width direction and/or wherein the mechanical connection is preferably formed at an upper edge of the central element.

7. The bending machine according to claim 1 , wherein the at least one side element is formed by two side elements between which the central element is located.

8. The bending machine according to claim 1 , wherein the central portion of the tool holder rests both on an upper edge of the central element and on an upper edge of the at least one side element.

9. The bending machine according to claim 1 , wherein the tool holder rests in a respective one of the free regions on an upper edge of the central element, wherein in the respective free region an upper edge of the at least one side element is spaced apart from the tool holder.

10. The bending machine according to claim 1 , wherein one or more limiting means are formed in at least one of the free regions in order to limit deformation of the central element during a bending operation of the workpiece.

11. The bending machine according to claim 10 , wherein at least one of the one or more limiting means comprises a stop element which is arranged with a play from 0.05 mm to 5.0 mm in an opening in the central element, wherein the amount of play determines the amount of deformation of the central element up to a limitation.

12. The bending machine according to claim 10 , wherein each of one or more limiting means comprises an adjusting means, by means of which an amount of deformation of the central element up to a limitation can be adjusted manually and/or by means of actuators.

13. The bending machine according to claim 12 , wherein the adjusting means comprises an eccentric, by means of which the amount of the deformation of the central element can be adjusted up to the limitation by rotation of the eccentric.

14. The bending machine according to claim 1 , wherein opposite edges of the lower beam in the width direction are mechanically connected to a component of a frame of the bending machine.

15. The bending machine according to claim 1 , wherein the lower beam is arranged adjacent, in the thickness direction, to a frame plate which has an opening for feeding the workpieces to be bent into the bending machine, wherein there is a mechanical connection between the lower beam and the frame plate.

Assignees

• Bystronic Laser Ag

Inventors

• Woidasky Lars

Classifications

• B30B15/026

  Mounting of dies, platens or press rams · CPC title

• B30B15/007

  Means for maintaining the press table, the press platen or the press ram against tilting or deflection · CPC title

• B21D5/04

  on brakes making use of clamping means on one side of the work · CPC title

• B21D5/0272 Primary

  Deflection compensating means · CPC title

• B21D5/02 Primary

  on press brakes without making use of clamping means · CPC title