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Method for forming high tensile strength metal sheet

a high tensile strength, metal sheet technology, applied in the field of metal sheet forming, can solve the problems of undesired warp or curl, end , /b> tend to form undesired warps or curls, adverse effects on metal sheet forming, etc., and achieve the effect of high tensile strength

Inactive Publication Date: 2010-05-27
WUU SHIANG INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]A primary object of the present invention is to provide a method for forming a high tensile strength sheet, which can avoid recoil after the HTSMS is formed.
[0007]An another object of the present invention is to provide a method for forming a high tensile strength sheet, which can shorten the forming process because of avoidance of recoil.
[0008]An another object of the present invention is to provide a method for forming a high tensile strength sheet, which can improve quality of finished products being formed by means of one-time forming.
[0009]To accomplish the above-mentioned objects, the present invention provides a method for forming a high tensile strength metal sheet (HTSMS), which is performed in a power press machine composed of a die, a punch and a blank holder. The HTSMS is placed between the die and punch with blank holder. A step portion appears at both an outer side of the punch and a pressing portion of the blank holder. The step portion is corresponding to a predetermined bent portion of the HTSMS. A step will be formed at an edge of the HTSMS by progressively pressing of the step portion to avoid recoil of the HTSMS after forming process.

Problems solved by technology

However, after the pressing action, the ends 12 of the sheet 10 tend to form an undesired warp or curl (i.e. “recoil”) because of its inner stress against the pressing force.
Thus, the quality of metal sheet forming will be adversely affected.
Moreover, an additional post-production is required because the desired shape can not be accomplished at a time.
Any of the above processes is lengthy and tardy.
It is very uneconomic.
Furthermore, the forming process with multiple forming and trimming steps may also reduce lifetime of the dies.
It is disadvantageous to the latter process.

Method used

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  • Method for forming high tensile strength metal sheet
  • Method for forming high tensile strength metal sheet
  • Method for forming high tensile strength metal sheet

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Embodiment Construction

[0022]The high tensile strength metal sheets mentioned in the present invention can be high tensile strength steel sheets made of steel adding several metal elements, such as, but not limited to, niobium, copper, vanadium and titanium. The high tensile strength metal sheets increasingly become popular and important for car industry because they have better properties than traditional materials.

[0023]Referring to FIG. 3, the power press machine applied in the invention includes a punch 32, a die 30 and a blank holder 34. The die 30 can also be called “female die”. Either the die 30 or the punch 32 is driven by a driving unit 40 to reciprocate upward and downward. The reciprocating motion of the die 30 or the punch 32 can be periodic or multi-staged by a program. The die 30 usually has a recess corresponding to the punch 32. As shown in FIG. 3, the die 30 and punch 32 are correspondingly recessing and projecting, respectively. The blank holder 34 can provide a pressing force onto the ...

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Abstract

A method for forming a high tensile strength metal sheet (HTSMS), which is performed in a power press machine composed of a die, a punch and a blank holder, is disclosed. The HTSMS is placed between the die and punch with blank holder. A step portion appears at both an outer side of the punch and a pressing portion of the blank holder. The step portion is corresponding to a predetermined bent portion of the HTSMS. A step will be formed at an edge of the HTSMS by progressively pressing of the step portion to avoid recoil of the HTSMS after forming process.

Description

TECHNICAL FIELD [0001]The invention relates to metal sheet forming, more particularly to a technique of bending high tensile strength sheets.BACKGROUND OF THE INVENTION [0002]Because metals have good strength and flexibility, they are usually used as a structural element requiring strength. When a force applied on a unit area of metal exceeds its tensile strength, the metal will not split like ceramic materials, but will be deformed. That is to say, metals have a property of plasticity, i.e. plastic deformation. Usually, a power press machine is used for deforming a metal. There is an upper and lower dies in a power press machine. By means of stroke, the metal material being placed between the two dies can be deformed as the shape formed by the dies.[0003]FIG. 1 illustrates a conventional technique of forming a high tensile strength metal sheet. The high tensile metal sheet 10 is placed between an upper die 20 and a lower die 22. During the pressing process, a blank holder 24 is use...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B21D39/00B21D22/00
CPCB21D22/06B21D22/02
Inventor CHIEN, YONG-WAH
Owner WUU SHIANG INDAL
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