EN 13906-2:2001
(Main)Cylindrical helical springs made from round wire and bar - Calculation and design - Part 2: Extension springs
Cylindrical helical springs made from round wire and bar - Calculation and design - Part 2: Extension springs
This standard specifies the calculation and design of cold and hot coiled helical cylindrical helical extension springs made from round wire and bar with values according to table 1, loaded in the direction of the spring axis and operating at normal ambient temperatures. NOTE 1 In cases of substantially higher or lower working temperature, it is advisable to seek the manufacturer's advice. NOTE 2 Quality Standards for cold coiled extension springs will be developed later.
Zylindrische Schraubenfedern aus runden Drähten und Stäben - Berechnung und Konstruktion - Teil 2: Zugfedern
Diese Norm gilt für die Berechnung und Konstruktion von kalt- und warmgeformten zylindrischen Schraubenzugfedern aus runden Drähten und Stäben, die in Richtung der Federachse auf Zug belastet sind und die bei üblicher Raumtemperatur arbeiten mit Werten nach Tabelle 1. ANMERKUNG 1 Bei wesentlichen höheren oder tieferen Betriebstemperaturen ist es zweckmäßig, sich mit dem Federhersteller zu beraten. ANMERKUNG 2 Gütenormen für kaltgeformte Zugfedern werden später erarbeitet.
Ressorts hélicoïdaux cylindriques fabriqués à partir de fils ronds et de barres - Calcul et conception - Partie 2: Ressorts de traction
La présente norme, spécifie le calcul et la conception des ressorts de traction hélicoïdaux cylindriques enroulés à chaud et à froid fabriqués à partir de fils ronds et de barres, ayant les valeurs du tableau 1, pour lesquels la sollicitation est appliquée dans la direction de l'axe du ressort et travaillant à température ambiante normale. NOTE 1 Pour des températures de service substantiellement supérieures ou inférieures, il est recommandé de demander conseil au fabricant. NOTE 2 Des normes sur la qualité des ressorts de traction enroulés à froid seront développées ultérieurement.
Vijačne valjaste vzmeti iz okrogle žice in palic - Izračun in načrtovanje - 2. del: Natezne vzmeti
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zylindrische Schraubenfedern aus runden Drähten und Stäben - Berechnung und Konstruktion - Teil 2: ZugfedernRessorts hélicoïdaux cylindriques fabriqués à partir de fils ronds et de barres - Calcul et conception - Partie 2: Ressorts de tractionCylindrical helical springs made from round wire and bar - Calculation and design - Part 2: Extension springs21.160VzmetiSpringsICS:Ta slovenski standard je istoveten z:EN 13906-2:2001SIST EN 13906-2:2009en,fr,de01-julij-2009SIST EN 13906-2:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13906-2December 2001ICS 21.160English versionCylindrical helical springs made from round wire and bar -Calculation and design - Part 2: Extension springsRessorts hélicoïdaux cylindriques fabriqués à partir de filsronds et de barres - Calcul et conception - Partie 2:Ressorts de tractionZylindrische Schraubenfedern aus runden Drähten undStäben - Berechnung und Konstruktion - Teil 2: ZugfedernThis European Standard was approved by CEN on 5 January 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 13906-2:2001 ESIST EN 13906-2:2009
for cold coiled springs.1210.2Permissible torsional stress
zul
for hot coiled springs.1210.3Initial
tension torsional stress 0.1211Calculation of extension springs for dynamic loading.13Annex A (informative)
Types of spring ends.14SIST EN 13906-2:2009
Wire or bar diameterd
17 mm10 mm
d < 35 mm
Coil diameterD
160 mmD
300 mm
Number of active coilsn
3n
Spring index4
w
w
12NOTE 1In cases of substantially higher or lower working temperature, it is advisable to seek the manufacturer’s advice.NOTE 2Quality Standards for cold coiled extension springs will be developed later.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 13906-1, Cylindrical helical springs made from round wire and bar - Calculation and design - Part 1:Compression springs.EN 10270-1:2001, Steel wire for mechanical springs – Part 1: Patented cold drawn unalloyed spring steel wire.EN 10270-2:2001, Steel wire for mechanical springs - Part 2: Oil hardened and tempered spring steel wire.EN 10270-3:2001, Steel wire for mechanical springs - Part 3: Stainless spring steel wire.EN 12166, Copper and copper alloys - Wire for general purposes.EN ISO 2162-1:1996, Technical product documentation - Springs - Part 1: Simplified representation(ISO 2162-1:1993).EN ISO 2162-3:1996, Technical product documentation - Springs - Part 3: Vocabulary (ISO 2162-3:1993).prEN 10089:1998, Hot-rolled steels for quenched and tempered springs – Technical delivery conditions.3 Terms and definitions, symbols, units and abbreviated terms3.1 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.SIST EN 13906-2:2009
F2 .LHmmdistance from inner radius of loop to spring bodyLKmmbody length when unloaded but subject to initial tension forceLnmmmaximum permissible spring length for the spring force Fnmmmhook openingN-Number of cycles up to rupturen-number of active coilsnt-total number of coilsSIST EN 13906-2:2009
spring forces F1, F2 .kN/mm²corrected torsional stress, (according to the correction factor k)k1, k2 .N/mm²corrected torsional stress, for the
spring forces F1, F2 .khN/mm²corrected
torsional stress range, for the stroke
shknN/mm²corrected torsional stress, for the
spring force FnnN/mm²uncorrected torsional stress, for the spring force FnzulN/mm²permissible torsional stressSIST EN 13906-2:2009
spring deflection2
spring lengthsFigure 1 — Theoretical extension spring diagram5 Types of loadingNOTEBefore carrying out design calculations it should be specified whether they will be subjected to static loading, quasi-static loading, or dynamic loading.5.1 Static and/or quasi-static loadingA static loading is: a loading constant in timeA quasi-static loading is: a loading variable with time with a negligibly small torsional stress range ( stroke
stress)( e.g. torsional stressrange up to 0,1
fatigue strength) a variable loading with greater torsional stress range but only a number of cycles of
up to 1045.2 Dynamic loadingIn the case of extension springs dynamic loading is loading variable with time with a number of loading cycles over104 and torsional stress range greater than 0,1
fatigue strength at:a) constant torsional stress range;SIST EN 13906-2:2009
107 for cold coiled springsIn this case the torsional stress range is lower than the infinite life fatigue limitb) limited life fatigue in which N
107 for cold coiled springsIn this case the torsional stress range is greater than the infinite life fatigue limit but smaller than the low cyclefatigue limit.In the case of springs with a time- variable torsional stress range and mean torsional stress, (set of torsional stresscombinations) the maximum values of which are situated above the infinite fatigue life limit, the service life can becalculated as a rough approximation with the aid of cumulative damage hypotheses. In such circumstances theservice life shall be verified by means of a fatigue test.6 Stress correction factor kThe distribution of torsional stresses over the cross section of the wire or bar of a spring is not uniform. The highesttorsional stress occurs at the inside coil surface of the spring due to the curvature of the wire or bar (see Figure 2).The maximum torsional
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