SIST EN 3848:2002

Aerospace series - Semi-finished metallic products - Methods of measuring form deviations

This standard specifies the methods of measuring deviations from the nominal form of semi-finished metallic products for aerospace applications.
This standard does not apply to:
-   extruded sections: see EN 2066;
-   folded sections: see EN 2065

Luft- und Raumfahrt - Metallisches Halbzeug - Messverfahren für Formabweichungen

Diese Norm legt die Verfahren zum Messen der Abweichungen von der Soll Form von metallischem Halbzeug für Anwendungen in der Luft- und Raumfahrt fest.
Diese Norm gilt nicht für:
   Strangpressprofile: siehe EN 2066;
   Gebogene Blechprofile: siehe EN 2065.

Série aérospatiale - Demi-produits métalliques - Méthodes de mesure des défauts de forme

Aerospace series - Semi-finished metallic products - Methods of measuring form deviations

General Information

• Status: Published
• Publication Date: 31-Dec-2001
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2002
• Due Date: 01-Jan-2002
• Completion Date: 01-Jan-2002
• Ref Project: EN 3848:2001 - Aerospace series - Semi-finished metallic products - Methods of measuring form deviations

Overview

EN 3848:2001 - Aerospace series - Semi‑finished metallic products - Methods of measuring form deviations is a CEN/AECMA European standard that defines how to measure deviations from the nominal form for semi‑finished metallic products used in aerospace applications. It provides measurement procedures, required measuring conditions and definitions of common form defects for sheets, plates, bars and tubes. The standard excludes extruded sections (see EN 2066) and folded sections (see EN 2065).

Key topics and requirements

• Scope and applicability
  • Applies to semi‑finished metallic products for aerospace use; not for extruded or folded profiles.
• Measuring condition
  • Use measuring instruments whose accuracy matches the dimension and tolerance involved.
  • Measurements should be made at workshop or laboratory ambient temperature; in case of dispute, use 15 °C to 25 °C.
  • Surface plates must be flat to within 1% of the requisite product form deviation being measured.
• Measurement methods per product type
  • Sheet and plate
    • Squareness: measured from the difference in diagonal lengths (AA and BB).
    • Lateral curvature: measured with the sheet resting on a horizontal surface plate.
    • Flatness: tolerance zone defined per ISO 1101; deviation from flatness (arching, buckling, edge waves) measured with a lightweight straight‑edge and feeler gauge, dial gauge or scale.
  • Round bar and circular tube
    • Straightness: deviation per metre and on specified lengths measured with the bar/tube on a surface plate positioned to minimize deviation.
    • Roundness: difference between maximum and minimum diameter at the same cross‑section.
    • Tube eccentricity: half the difference between maximum and minimum wall thickness at a cross‑section.
  • Hexagonal, square and rectangular bars
    • Straightness and twist: measured on a horizontal plate minimizing deviation; twist is the maximum distance between the bottom surface and plate along the length.
    • Surface flatness and squareness: measured on faces and across flats as illustrated in the standard.
• Normative references
  • Incorporates ISO 1101 for geometrical tolerancing and references EN 2065 and EN 2066 for excluded profile types.

Applications and users

• Practical for: aerospace manufacturers, metallurgical inspection labs, quality engineers, procurement specialists and suppliers of aluminium and other metallic semi‑finished products for aircraft and spacecraft.
• Use cases:
  • Incoming inspection of sheet, plate, bar and tube stock.
  • Verifying conformity to aerospace dimensional tolerances.
  • Preparing technical inspection plans and supplier quality agreements.

Related standards

• EN 2065 - Folded profiles (excluded by EN 3848)
• EN 2066 - Extruded sections (excluded by EN 3848)
• ISO 1101 - Geometrical tolerancing (referenced for flatness and tolerance zones)

Keywords: EN 3848, methods of measuring form deviations, aerospace series, semi‑finished metallic products, flatness, straightness, roundness, twist, eccentricity, squareness, measurement procedures.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Semi-finished metallic products - Methods of measuring form deviationsLuft- und Raumfahrt - Metallisches Halbzeug - Messverfahren für FormabweichungenSérie aérospatiale - Demi-produits métalliques - Méthodes de mesure des défauts de formeAerospace series - Semi-finished metallic products - Methods of measuring form deviations49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace constructionICS:Ta slovenski standard je istoveten z:EN 3848:2001SIST EN 3848:2002en01-januar-2002SIST EN 3848:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3848September 2001ICS 49.035English versionAerospace series - Semi-finished metallic products - Methods ofmeasuring form deviationsSérie aérospatiale - Demi-produits métalliques - Méthodesde measure des défauts de formeLuft- und Raumfahrt - Metallisches Halbzeug -Meßverfahren für FormabweichungenThis European Standard was approved by CEN on 2 May 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3848:2001 ESIST EN 3848:2002

1 % of the requisiteproduct form deviation being measured.4Sheet and plate4.1SquarenessThe squareness deviation shall be measured as the difference in length of diagonals AA and BB as shown infigure 1.4.2Lateral curvatureThe la
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