ISO 12004-1:2020 金属材料—シートとストリップの成形限界曲線の決定—パート1：プレスショップでの成形限界図の測定と適用 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 2, Ductility testing, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 459/SC 1, Test methods for steel (other than chemical analysis), in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 12004-1:2008), which has been technically revised.

The main changes compared to the previous edition are as follows:

• 1) The title was changed to have three elements.
• 2) Clauses 2 and 3 were added from the previous edition, and the subsequent sections were renumbered.
• 3) The description of when to use this document (ISO 12004-1) or ISO 12004-2 was revised in the Introduction.
• 4) Throughout the document the use of engineering strain was clarified.
• 5) Subclause 6.2 was extended to include what was the subsequent Clause in the previous version.
• 6) The former note was moved to part of Clause 7, since it gives permission to use another method.
• 7) The text in Annex A and the figure captions in Annex B were clarified.

A list of all parts in the ISO 12004 series can be found on the ISO website.

Introduction

A forming-limit diagram (FLD) is a diagram containing measured major/minor strain points on a formed part.

An FLD can distinguish between safe and necked, or failed, points. The transition from safe to failed points is defined by the forming-limit curve (FLC).

To determine the forming limit of materials, two different methods are possible.

• 1) Strain analysis of failed press shop components to determine component and process dependent FLCsIn the press shop, strain paths to reach these points are generally not known. Such an FLC depends on the material, the component, and the chosen forming conditions. This method is described in this document and is not intended to determine one unique FLC for each material.
• 2) Determination of FLCs under well-defined laboratory conditionsFor evaluating formability, one unique FLC for each material in several strain states can be measured. The determination of FLC must be specific and uses multiple linear strain paths. The ISO 12004-2 is intended for this type of material characterization.

1 Scope

This document specifies a procedure for developing forming-limit diagrams and forming-limit curves for metal sheets and strips of thicknesses from 0,3 mm to 4 mm.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography