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Method for evaluating whether the sheared edge can be formed

An evaluation method and edge technology, which is applied in the direction of testing the ductility of materials, etc., can solve the problems of unclear molding, material edge application without any consideration, etc., and achieve the effect of preventing adverse effects

Active Publication Date: 2019-12-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned methods for judging whether the sheared edge of the stamped product can be formed are all evaluated on the edge of the sheared material without pre-deformation (one-time forming). Applied in material edge without any consideration
[0004] Based on the above, there has been a problem with the accuracy of determining whether the sheared edge can be molded after one molding, and there is a problem that it is not clear whether it can be molded unless it is molded.

Method used

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  • Method for evaluating whether the sheared edge can be formed
  • Method for evaluating whether the sheared edge can be formed
  • Method for evaluating whether the sheared edge can be formed

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Experimental program
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no. 1 Embodiment approach

[0076] Next, a method of evaluating whether or not a cut edge can be formed according to the present embodiment will be described with reference to the drawings.

[0077] The method for evaluating whether a cut edge can be formed or not in the present embodiment is a technique for evaluating whether or not the cut edge can be formed for a metal plate that has been formed (preformed) once.

[0078]

[0079] Such as Figure 13 As shown, the moldability evaluation method of this embodiment includes the experimental data acquisition step 1, the effect variable setting step 2 such as pre-deformation, the moldable area determination step 3, the molding specification data acquisition step 4, and the whether or not judgment step 5.

[0080] In the experimental data acquisition step 1, a hole expansion test is performed on a metal plate that has been preformed in advance. In the hole-expanding test, two or more types of hole-expanding tests in which the radial strain gradient at the...

no. 2 Embodiment approach

[0129] Next, a second embodiment will be described with reference to the drawings. The same reference numerals will be assigned to the same configurations as those of the first embodiment, and will be described.

[0130] Such as Figure 16 As shown, the moldability evaluation method of this embodiment includes: the experimental data acquisition process 7 under the condition of no preforming, the process 8 of determining the formable area under the condition of no preforming, the conversion process 9 to the conversion after preforming, and the forming process. Specification data acquisition step 4 and whether or not judgment step 5.

[0131] In the experimental data acquisition step 7 without preforming, a hole expansion test is carried out on the metal plate without preforming (the metal plate before preforming), and the radial strain gradient at the sheared edge and the The deformation limit equivalent variable of the metal plate is a plurality of data with different strain...

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Abstract

The purpose of the present invention is to provide a technique for more precisely evaluating the propriety of forming a sheared material edge after preforming. Through a hole enlargement test on a metal plate after preforming, a strain gradient at a sheared edge is changed and a plurality of data of the deformation limit equivalent strain amount with respect to the strain gradient are calculated, and a relationship of a stretch flange deformation limit equivalent strain to the strain gradient is calculated from the plurality of data and the amount of pre-deformation equivalent strain. The propriety of forming a sheared edge for a metal plate subjected to pre-deformation by preforming is evaluated from a forming limit line L or formable region R of the sheared edge from the calculated relationship.

Description

technical field [0001] The present invention relates to the technology of evaluating whether the edge of the material to be cut can be formed after one forming. For example, it relates to a technique for evaluating whether or not a cut edge of a stamped product for an automobile or the like can be molded by FEM (Finite Element Method, finite element method) simulation. Background technique [0002] As a method of evaluating the possibility of formability at the sheared edge of the stamped product based on the deformation state near the sheared edge, which has a large influence on the deformation limit, there are, for example, the determination methods described in Patent Documents 1 to 3. [0003] However, the above-mentioned methods for judging whether the sheared edge of the stamped product can be formed are all evaluated on the edge of the sheared material without pre-deformation (one-time forming). Applications in material edges are not taken into account. [0004] Fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/28B21D22/00B21D28/00
CPCB21D22/00B21D28/00G01N3/28
Inventor 饭塚荣治樋贝和彦山崎雄司
Owner JFE STEEL CORP