# US 9,873,237 B2 · Method for forming a crimping fold in a multi-layer composite material and multi-layer composite material having at least one crimping fold

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- Number: US 9,873,237 B2
- Document ID: US9873237B2
- Status: Granted
- Kind: B2
- Application number: 12/990,888
- Filed: 2009-04-28
- Published: 2011-05-26
- Granted: 2018-01-23
- Earliest claimed: 2008-05-09
- Assignees: ThyssenKrupp Steel Europe AG
- Applicants: Thorsten Böger; Erik Hilfrich; Oliver Kleinschmidt
- Inventors: Thorsten Böger; Erik Hilfrich; Oliver Kleinschmidt
- Web page: https://patentgrep.com/patent/US9873237B2

## CPC

- B32B 15/08: of synthetic resin
- B21D 19/00: Flanging or other edge treatment, e.g. of tubes (connecting by making use of folds B21D39/00; flaring-out tube ends B21D41/02)
- B32B 1/00: Layered products having a non-planar shape
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 15/046: {of foam}
- B32B 15/18: comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)}
- B32B 2266/00: Composition of foam
- B32B 2266/0214: Materials belonging to B32B27/00
- B32B 2266/0221: Vinyl resin
- B32B 2307/30: having particular thermal properties
- B32B 2307/304: Insulating
- B32B 2307/306: Resistant to heat
- B32B 2307/50: having particular mechanical properties
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/714: Inert, i.e. inert to chemical degradation, corrosion
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/72: Density
- B32B 2605/08: Cars
- Y10T 428/24628: Nonplanar uniform thickness material
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for forming a beading fold in a multi-layer composite material, which has at least one core layer made of a plastics material and at least two cover layers made of a metallic material, provides high process reliability and optimal integrity of the formed multi-layer composite material. In particular, the method provides that, in the region of the beading fold to be formed, the core layer of the composite material is heated at least in portions to a temperature of 180° C. to 300° C. Also described herein is a multi-layer composite material having at least one beading fold, said material comprising at least one core layer made of a plastics material and at least two cover layers made of a metallic material.

## Claims

### Claim 1

Method for forming a beading fold in a multi-layer composite material, which has at least one core layer made of a plastics material and at least two cover layers made of a metallic material, wherein the complete material of the at least one core layer of the composite material is heated to a temperature of 180.degree. C. to 300.degree. C. in a region of the beading fold to be formed to reduce the strength of the plastics material so that the plastics material from the region of the beading fold is partially displaced and the core layer in the region of the bend of the formed beading fold tapers compared to regions outside of the bend of the beading fold.

### Claim 2 (depends on 1)

Method according to claim 1, wherein the heating is carried out to a temperature of 200.degree. C. to 260.degree. C.

### Claim 3 (depends on 1)

Method according to claim 1, wherein the heating is ended before the beginning of the forming.

### Claim 4 (depends on 1)

Method according to claim 1, wherein the heating is carried out at least temporarily during the forming.

### Claim 5 (depends on 2)

Method according to claim 2, wherein the metallic material of the at least two cover layers is a steel or a steel alloy.

### Claim 6 (depends on 1)

Method according to claim 1, wherein the at least two cover layers have thicknesses which are identical or differ from one another.

### Claim 7 (depends on 1)

Method according to claim 1, wherein the at least one core layer has a thickness which is greater by a factor of 2 to 5 than the thickest cover layer.

### Claim 8 (depends on 1)

Method according to claim 1, wherein the at least one core layer consists of a foamed plastics material.

### Claim 9 (depends on 1)

An automobile part formed as one element selected from the group consisting of a carrier element and profile element comprising a multi-layer composite material having at least one beading fold formed by the method of claim 1.

### Claim 10 (depends on 8)

Method according to claim 8, wherein the foamed plastics material includes gas inclusions.