EN ISO 12004-1:2020

Metallic materials - Determination of forming-limit curves for sheet and strip - Part 1: Measurement and application of forming-limit diagrams in the press shop (ISO 12004-1:2020)

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.

Metallische Werkstoffe - Bestimmung der Grenzformänderungskurven für Bleche und Bänder - Teil 1: Messung und Anwendung von Grenzformänderungsdiagrammen in Presswerken (ISO 12004 1:2020)

Dieses Dokument legt ein Verfahren für die Erstellung von Grenzformänderungsdiagrammen und Grenzformänderungskurven für Metallbleche und  bänder mit Dicken von 0,3 mm bis 4 mm fest.

Matériaux métalliques - Détermination des courbes limites de formage pour les tôles et bandes - Partie 1: Mesurage et application des diagrammes limites de formage dans les ateliers d'emboutissage (ISO 12004-1:2020)

Le présent document spécifie une procédure pour l'établissement des diagrammes limites de formage et des courbes limites de formage pour les tôles et bandes métalliques d'épaisseur comprise entre 0,3 mm et 4 mm.

Kovinski materialii - Določevanje krivulj preoblikovalnosti za pločevino in trakove - 1. del: Merjenje in uporaba diagramov preoblikovalnosti na stiskalnicah (ISO 12004-1:2020)

General Information

• Status: Published
• Publication Date: 03-Nov-2020
• Withdrawal Date: 30-May-2021
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Drafting Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 04-Nov-2020
• Completion Date: 04-Nov-2020
• Ref Project: SIST EN ISO 12004-1:2021 - Metallic materials - Determination of forming-limit curves for sheet and strip - Part 1: Measurement and application of forming-limit diagrams in the press shop (ISO 12004- 1:2020)

Relations

• Replaces: EN ISO 12004-1:2008 - Metallic materials - Sheet and strip - Determination of forming-limit curves - Part 1: Measurement and application of forming-limit diagrams in the press shop (ISO 12004-1:2008)
• Effective Date: 08-Jun-2022

Overview

EN ISO 12004-1:2020 (ISO 12004-1:2020) defines a practical, press-shop procedure for developing forming‑limit diagrams (FLDs) and forming‑limit curves (FLCs) for metallic sheets and strips with thicknesses from 0.3 mm to 4 mm. The standard specifies how to apply grid patterns, form test pieces in production‑like tooling, measure engineering strains at the onset of fracture, and plot forming‑limit curves to distinguish safe from necked (failed) regions. This edition supersedes the 2008 version and is intended for in‑shop, component‑ and process‑dependent FLCs (as distinct from laboratory characterisation covered in ISO 12004-2).

Key topics and technical requirements

• Scope and intent: Measurement and application of FLDs/FLCs in the press shop for sheet/strip materials (0.3–4 mm).
• Gauge length: Recommended gauge lengths 1.5 mm to 5.0 mm; actual lengths must be known to ±2%.
• Strain type: Uses engineering strain for forming‑limit determination in the press‑shop context.
• Uniform strain before necking: Test setups must ensure the critical area exhibits uniform strain prior to necking (clamping and tooling selection are important).
• Test methods and tooling: Any device satisfying Clause 6 may be used - stamping presses, universal testing machines, cupping presses, hydraulic bulge machines, etc.
• Specimen preparation and lubrication: Test pieces shall be clamped around the periphery or cut into strips to obtain varied strain states; surfaces between punch and specimen must be suitably lubricated (standard lubricants or polyethylene + lubricant allowed).
• Measurement procedure: Apply an accurate grid pattern, form until first fracture, measure three adjacent gauge lengths in the major strain direction (repeat until three values agree within ±10%, use average l0), measure the transverse gauge length, then compute engineering strains (e_major and e_minor) from measured and original gauge lengths.
• Documentation: Plot the FLC on the FLD and report test conditions; Annex A provides guidance on modifying FLCs and Annex B shows example grid patterns.

Applications and users

• Applications: In‑shop formability assessment, die try‑out, stamping process validation, failure analysis, production quality control, and baseline data for forming simulations.
• Who uses it: Press‑shop and stamping engineers, process and tooling designers, metallurgists, QA engineers, CAE/simulation specialists, and labs performing in‑shop material verification.

Related standards

• ISO 12004-2 - laboratory determination of FLCs under well‑defined conditions (material characterisation with true strain and multiple linear strain paths).
• EN ISO 12004-1:2008 - superseded by this 2020 edition.

Keywords: forming‑limit diagram, FLD, forming‑limit curve, FLC, sheet metal formability, press shop, EN ISO 12004-1:2020.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2021
Nadomešča:
SIST EN ISO 12004-1:2009
Kovinski materialii - Določevanje krivulj preoblikovalnosti za pločevino in trakove -
1. del: Merjenje in uporaba diagramov preoblikovalnosti na stiskalnicah (ISO 12004
-1:2020)
Metallic materials - Determination of forming-limit curves for sheet and strip - Part 1:
Measurement and application of forming-limit diagrams in the press shop (ISO 12004-
1:2020)
Metallische Werkstoffe - Bestimmung der Grenzformänderungskurven für Bleche und
Bänder - Teil 1: Messung und Anwendung von Grenzformänderungsdiagrammen in
Stanzereien (ISO 12004-1:2020)
Matériaux métalliques - Détermination des courbes limites de formage pour les tôles et
bandes - Partie 1: Mesurage et application des diagrammes limites de formage dans les
ateliers d'emboutissage (ISO 12004-1:2020)
Ta slovenski standard je istoveten z: EN ISO 12004-1:2020
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 12004-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2020
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 12004-1:2008
English Version
Metallic materials - Determination of forming-limit curves
for sheet and strip - Part 1: Measurement and application
of forming-limit diagrams in the press shop (ISO 12004-
1:2020)
Matériaux métalliques - Détermination des courbes Metallische Werkstoffe - Bestimmung der
limites de formage pour les tôles et bandes - Partie 1: Grenzformänderungskurven für Bleche und Bänder -
Mesurage et application des diagrammes limites de Teil 1: Messung und Anwendung von
formage dans les ateliers d'emboutissage (ISO 12004- Grenzformänderungsdiagrammen in Stanzereien (ISO
1:2020) 12004-1:2020)
This European Standard was approved by CEN on 15 October 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12004-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 12004-1:2020) has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals" in collaboration with Technical Committee CEN/TC 459/SC 1 “Test
methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2021, and conflicting national standards shall be
withdrawn at the latest by May 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 12004-1:2008.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 12004-1:2020 has been approved by CEN as EN ISO 12004-1:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 12004-1
Second edition
2020-10
Metallic materials — Determination
of forming-limit curves for sheet and
strip —
Part 1:
Measurement and application of
forming-limit diagrams in the press
shop
Matériaux métalliques — Détermination des courbes limites de
formage pour les tôles et bandes —
Partie 1: Mesurage et application des diagrammes limites de formage
dans les ateliers d'emboutissage
Reference number
ISO 12004-1:2020(E)
©
ISO 2020
ISO 12004-1:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 12004-1:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Principle . 1
6 Test conditions . 2
7 Procedure. 3
8 Interpretation of results . 3
9 Test report . 4
Annex A (informative) Modification to forming-limit curves . 5
Annex B (informative) Examples of grid patterns currently in use . 6
Bibliography . 8
ISO 12004-1:2020(E)
Foreword
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