Method for determining a pressure distribution of a molding tool device as well as reshaping apparatus and composite sheet metal component

Patent metadata

Field	Value
Publication number	US-12551978-B2
Application number	US-202318230966-A
Country	US
Kind code	B2
Filing date	Aug 7, 2023
Priority date	Sep 21, 2022
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

A method is provided for determining a pressure distribution of a molding tool device ( 1 ) for reshaping a sheet metal component ( 2 ). The pressure distribution represents a load on the sheet metal component ( 2 ) caused by reshaping in the molding tool device ( 1 ). The method includes introducing a piezoelectric material ( 3 ) into a raw material ( 12 ) of the sheet metal component ( 2 ) to form a composite sheet metal component ( 4 ) that provides an electrical voltage under mechanical loads. The method proceeds by arranging the composite sheet metal component ( 4 ) in the molding tool device ( 1 ) and reshaping the composite sheet metal component ( 4 ) with the molding tool device ( 1 ). The method then uses at least one sensor device ( 5 ) for detecting spatially resolved electric voltage signals that emanate from the composite sheet metal component ( 4 ) during the reshaping and determining the pressure distribution using the detected spatially resolved voltage signals.

First claim

The invention claimed is:

1 . A method for determining a pressure distribution of a molding tool device ( 1 ) for reshaping a sheet metal component ( 2 ), wherein the pressure distribution represents a load on the sheet metal component ( 2 ) caused by reshaping in the molding tool device ( 1 ), the method comprising:
introducing a piezoelectric material ( 3 ) into a raw material ( 12 ) of the sheet metal component ( 2 ) to form a composite sheet metal component ( 4 ) that provides an electrical voltage under mechanical loads; arranging the composite sheet metal component ( 4 ) in the molding tool device; reshaping the composite sheet metal component ( 4 ) with the molding tool device ( 1 ); using at least one sensor device ( 5 ) for detecting spatially resolved electric voltage signals that emanate from the composite sheet metal component ( 4 ) during the reshaping, by means of the at least one sensor device ( 5 ); and determining the pressure distribution using the detected spatially resolved voltage signals.

2 . The method of claim 1 , wherein the voltage signals are registered as a function of time, such that a temporal progression of a compressive load can be determined during the reshaping.

3 . The method of claim 1 , wherein introducing the piezoelectric material ( 3 ) into the raw material ( 12 ) of the sheet metal component ( 2 ) comprises cohesively embedding the piezoelectric material ( 3 ) in the raw material ( 12 ) of the sheet metal component ( 2 ).

4 . The method of claim 1 , wherein introducing the piezoelectric material ( 3 ) into the raw material ( 12 ) of the sheet metal component ( 2 ) comprises surface layer dispersion.

5 . The method of claim 1 , wherein the piezoelectric material ( 3 ) comprises particles ( 13 ) that define measurement points ( 6 ) from which voltage signals emanate, and wherein using at least one sensor device ( 5 ) for detecting spatially resolved electric voltage signals comprises individually tapping the voltage signals of the measurement points ( 6 ) with the sensor device ( 5 ) during the reshaping.

6 . The method of claim 5 , wherein the particles ( 13 ) are smaller than 1 micron.

7 . The method of claim 1 , wherein the molding tool device ( 1 ) comprises at least two opposing molding tools ( 11 , 21 ) and wherein the composite sheet metal component ( 4 ) faces the at least two molding tools ( 11 , 21 ) and wherein the voltage signals emanating from the composite sheet metal component ( 4 ) are detected in a spatially resolved manner.

Assignees

• Porsche Ag

Inventors

• Reichelt Lars
• Buehler Ronny
• Leubner Jonas

Classifications

• G01L5/008

  Force sensors integrated in an article or a dummy workpiece · CPC title

• G01L1/16

  using properties of piezoelectric devices · CPC title

• B21D28/14

  Dies (ejecting or stripping-off devices arranged in punching machines or tools B21D45/00) · CPC title

• B21D22/02

  Stamping using rigid devices or tools · CPC title

• B30B15/26

  Program-control arrangements · CPC title