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Method Of Forming A Sheet Steel Workpiece, Especially Method Of Blank

A technology for workpieces and steel plates, applied to the field of forming workpieces composed of steel plates, which can solve problems such as reduced formability and restrictions on lightweight structures

Inactive Publication Date: 2016-03-16
THYSSENKRUPP STEEL EURO AG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the strength of the steel material (carbon steel) increases, there is generally a decrease in formability; therefore, geometric adjustments are almost fully exploited for existing wheel discs
Therefore, the potential for further lightweight construction with cold forming solutions seems to have been limited

Method used

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  • Method Of Forming A Sheet Steel Workpiece, Especially Method Of Blank
  • Method Of Forming A Sheet Steel Workpiece, Especially Method Of Blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] exist figure 1 , a blank composed of a steel sheet as workpiece 1 is shown in a sectional view, this blank being in a state which has not yet undergone further forming processes (hot forming and subsequent cold forming).

[0037] figure 1 The workpiece 1 in is composed of two steel layers 2, 3 which have been inseparably connected to each other by roll bonding, the two steel layers 2, 3 being different from each other in terms of strength and elongation at break. The upper steel layer 2 consists of an alloy steel with lower strength and higher elongation at break than the other steel layer 3 . The lower steel layer 3 is composed of alloy steel having relatively high strength and relatively low elongation at break. In the present exemplary embodiment, the steel layer 2 occupies 60% of the total thickness of the plate-shaped workpiece 1 , and the steel layer 3 occupies 40% of the total thickness of the plate-shaped workpiece 1 .

[0038] In order to get e.g. figure 2...

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PUM

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Abstract

The invention relates to a method for the forming of a workpiece, in particular a blank, composed of sheet steel, in which method the following steps are performed in succession: providing a workpiece composed of multiple steel layers which have been non-detachably connected to one another by roll-bonding and of which at least two steel layers have a different strength and / or elongation at fracture, heating the workpiece, and subjecting the workpiece to hot forming. To ensure a high strength and at the same time the easiest possible formability, the invention proposes that at least one section of the hot-formed workpiece is hardened, and that the workpiece is subsequently subjected to cold forming in the region in which the hardening has been performed. The invention also relates to a corresponding workpiece.

Description

technical field [0001] The present invention relates to a method for forming workpieces, in particular blanks, composed of steel sheets, in which method the following steps are performed in sequence: A workpiece constructed of a plurality of steel layers, wherein at least two steel layers have different strengths and / or elongations at break; heating the workpiece; and subjecting the workpiece to hot forming. [0002] The invention also relates to workpieces, in particular wheel discs for vehicle wheelrims, produced by the method according to the invention. Background technique [0003] Wheels are safety-critical components and must therefore permanently withstand high fluctuating mechanical loads during operation. A conventional steel wheel consists of a disc, which ensures the connection to the hub, and a rim strip for holding the tire, which is connected to the disc in a wrap-around fashion on the inside of the disc. Today, roulettes are manufactured by multi-stage press...

Claims

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Application Information

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IPC IPC(8): B21C37/02B23P15/00
CPCB21D22/022Y10T29/49529Y10T29/49524Y10T29/49531Y10T29/49526C21D1/673C21D7/02C21D1/06C21D6/00B21D35/007B21D35/001B21D39/031B21B1/38B21D53/30
Inventor 斯特凡娜·格拉夫大卫·皮耶罗纳克马库斯·策纳克
Owner THYSSENKRUPP STEEL EURO AG