Method for producing a component by hot forming a pre-product made of steel

Patent metadata

Field	Value
Publication number	US-9943894-B2
Application number	US-201214234020-A
Country	US
Kind code	B2
Filing date	Jul 4, 2012
Priority date	Jul 20, 2011
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

In a method for producing a component by hot forming of a pre-product made of steel, the pre-product is heated to forming temperature and subsequently formed. The product is heated to a temperature below the AC 1 -transformation temperature and undergoes a strength increase prior to the heating by cold forming.

First claim

What is claimed is:

1. A method for producing a component by hot forming of a pre-product made of steel, comprising;
subjecting the pre-product to a deformation by cold drawing or cold rolling with a deformation degree of at least 3%, whereby the pre-product undergoes a strength increase as a result of the deformation;
heating the pre-product to forming temperature below AC1-transformation temperature; and
forming the pre-product by hot forming at the forming temperature into the component.

2. The method of claim 1 , wherein the deformation degree is at least 5%.

3. The method of claim 1 , wherein the deformation degree is between 5-35%.

4. The method of claim 1 , wherein the pre-product is heated in the heating step to a temperature below 720° C.

5. The method of claim 4 , wherein the pre-product is heated in the heating step to a temperature in the range from 400 to 700° C.

6. The method of claim 5 , wherein the pre-product is heated in the heating step to a temperature in the range from 540 to 700° C.

7. The method of claim 1 , further comprising prior to the heating step providing the pre-product with a metallic or lacquer-like coating.

8. The method of claim 7 , further comprising prior to the deformation step providing the pre-product with a metallic or lacquer-coating.

9. The method of claim 7 , wherein the metallic coating contains at least one element selected from the group consisting of Zn, Mg, Al and Si.

10. The method of claim 1 , wherein the heating to the forming temperature occurs inductively, conductively or by means of radiation.

11. The method of claim 1 , wherein the pre-product is a sheet metal plate or a pipe.

12. The method of claim 11 , wherein the sheet metal plate is made of hot strip.

13. The method of claim 11 , wherein the pipe is a seamlessly rolled pipe or a welded pipe produced from hot strip.

Assignees

• Evertz Thomas
• Flaxa Volker
• Braun Michael
• Salzgitter Flachstahl Gmbh

Inventors

• Evertz Thomas
• Flaxa Volker
• Braun Michael

Classifications

• B21D22/208 Primary

  by heating the blank or deep-drawing associated with heat treatment (C21D takes precedence) · CPC title

• C21D7/13

  by hot working · CPC title

• B21C1/00

  Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing · CPC title

• C21D9/08

  for tubular bodies or pipes · CPC title

• C21D1/673

  for die quenching · CPC title