Method for the production of sheet metal parts and device therefor

Patent metadata

Field	Value
Publication number	US-2025050405-A1
Application number	US-202218717183-A
Country	US
Kind code	A1
Filing date	Dec 8, 2022
Priority date	Dec 20, 2021
Publication date	Feb 13, 2025
Grant date	—

Abstract

The present disclosure provides a method and a device for producing sheet-metal parts with substantially reduced spring-back.

First claim

1 - 9 . (canceled)

10 . A method for producing a sheet-metal part, wherein the method comprises:
preforming a sheet into a metal preform in a preforming tool, wherein the metal preform is configured as an open profile with an opening and in its longitudinal extent has at least one flangeless portion and, at least in regions, surplus sheet material; and final forming of the metal preform into a sheet-metal part in a calibration tool comprising at least one calibration punch and at least one calibration die, in which the surplus sheet material in the metal preform is compressed by a relative movement between the calibration punch and the calibration die; wherein the metal preform is laid in the calibration tool such that its opening points downward and is positioned on the calibration punch, and that during final forming, because of the relative movement, the edge of the metal preform present at least in the flangeless portion comes into contact with a punch shoulder of the calibration punch rests thereon and is pressure-loaded; wherein during the relative movement, the calibration die passes by the punch shoulder of the calibration punch, at least in the region of the flangeless portion of the metal preform, with a minimum possible gap corresponding to between >0% and 20% of the material thickness of the inserted sheet, before the final forming is completed.

11 . The method as claimed in claim 10 , wherein the metal preform is provided with a floor which, during preforming, is loaded with a surplus sheet material at least in the region of the flangeless portion, such that a floor region pre-curved in the direction of the opening is produced during the preforming, so that the metal preform is positioned on the calibration punch at least via the pre-curved floor region, at least in the region of the flangeless portion of the metal preform, such that the edge of the metal preform present at least in the flangeless portion is arranged above the punch shoulder.

12 . The method as claimed in claim 10 , wherein the metal preform is provided with a floor in which, locally or in portions, embossings pointing in the direction of the opening are produced during the preforming, so that the metal preform is positioned on the calibration punch at least via the embossings such that the edge of the metal preform present at least in the flangeless portion is arranged above the punch shoulder.

13 . The method as claimed in claim 10 , wherein the metal preform is provided with a floor, wherein during insertion of the metal preform in the calibration tool, at least a part region of the floor comes into contact with at least one adjustable insert which is arranged in the calibration punch and spaced from the calibration punch on insertion of the metal preform, and the metal preform is positioned on the insert at least via the part region of the floor, at least in the region of the flangeless portion of the metal preform, such that the edge of the metal preform present at least in the flangeless portion is arranged above the punch shoulder.

14 . A device for producing a sheet metal part, with at least one preform tool for preforming a sheet into a metal preform, wherein the metal preform is configured as an open profile with an opening and in its longitudinal extent has at least one flangeless portion and, at least in regions, surplus sheet material; and with at least one calibration tool for final forming of the metal preform into a sheet-metal part, wherein the calibration tool comprises at least one calibration punch and at least one calibration die, wherein the surplus sheet material in the metal preform is compressed by the relative movement between the calibration punch and the calibration die; wherein the metal preform is positioned on the calibration punch with its opening at the bottom, wherein the calibration punch has at least one punch shoulder which is provided at least in the flangeless portion of the metal preform, such that by the relative movement, the edge of the metal preform present at least in the flangeless portion can be brought into contact with a punch shoulder of the calibration punch, can rest thereon and be pressure-loaded, wherein the calibration punch is arranged stationarily and the calibration die movably in the calibration tool.

15 . The device as claimed in claim 14 , wherein the calibration punch has at least one adjustable insert which is arranged in the calibration punch and can be spaced from the calibration punch.

16 . The device as claimed in claim 14 , wherein the calibration die is formed in multiple pieces and has at least one adjustable die cheek at least in the flangeless portion of the metal preform.

17 . The device as claimed in claim 14 , wherein the punch shoulder has a maximum extent of the material thickness of the inserted sheet plus >0 to 0.35 mm.

18 . The device as claimed in claim 14 , wherein the device is integrated in one of a pressing line, a transfer press and a follow-on press.

Assignees

• Thyssenkrupp Steel Europe Ag

Inventors

• Kibben Martin
• Sieczkarek Peter
• Linnepe Michael
• Petric Alexander

Classifications

• B21D22/21

  without fixing the border of the blank · CPC title

• B21K23/00

  Making other articles · CPC title

• B21D22/30 Primary

  to finish articles formed by deep-drawing · CPC title

• B21D3/10 Primary

  between rams and anvils or abutments · CPC title