EN 13906-1:2013

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 1: DruckfedernRessorts hélicoïdaux cylindriques fabriqués à partir de fils ronds et de barres - Calcul et conception - Partie 1: Ressorts de compressionCylindrical helical springs made from round wire and bar - Calculation and design - Part 1 : Compression springs21.160VzmetiSpringsICS:Ta slovenski standard je istoveten z:EN 13906-1:2013SIST EN 13906-1:2014en,fr,de01-januar-2014SIST EN 13906-1:2014SLOVENSKI
STANDARDSIST EN 13906-1:20091DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13906-1
July 2013 ICS 21.160 Supersedes EN 13906-1:2002English Version
Cylindrical helical springs made from round wire and bar - Calculation and design - Part 1 : Compression springs
Ressorts hélicoïdaux cylindriques fabriqués à partir de fils ronds et de barres - Calcul et conception - Partie 1: Ressorts de compression
Zylindrische Schraubenfedern aus runden Drähten und Stäben - Berechnung und Konstruktion - Teil 1: Druckfedern This European Standard was approved by CEN on 30 May 2013.
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.
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Examples of relaxation for cold coiled springs . 29 Bibliography . 35
(ISO 2162-1:1993) EN ISO 26909:2010, Springs — Vocabulary (ISO 26909:2009) ISO 26910-1, Springs — Shot peening — Part 1: General procedures 3 Terms, definitions, symbols, units and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 26909:2010 and the following apply. 3.1.1 spring mechanical device designed to store energy when deflected and to return the equivalent amount of energy when released [SOURCE: EN ISO 26909:2010, 1.1] 3.1.2 compression spring spring (1.1) that offers resistance to a compressive force applied axially [SOURCE: EN ISO 26909:2010, 1.2] SIST EN 13906-1:2014

NOTE The actual spring force at the solid length is as a rule greater than the theoretical force FK N buckling force Fn N spring force for the minimum permissible spring length Ln FQ N spring force perpendicular to the spring axis (transverse spring force) fe s-1
(Hz) natural frequency of the first order of the spring (fundamental frequency) G N/mm² (MPa) modulus of rigidity
k - stress correction factor (depending on D/d ) L mm spring length L0 mm nominal free length of spring L1, L2. mm spring lengths for the spring forces
F1, F2. SIST EN 13906-1:2014

F1, F2 . sc mm spring deflection, for the solid length, Lc sh mm deflection of
spring (stroke ) between two positions sK mm spring deflection, for the buckling force FK (buckling spring deflection) sn mm spring deflection, for the spring force
Fn sQ mm transverse spring deflection, for the transverse force FQ vSt m/s impact speed W Nmm spring work, dDw= - spring index η
- spring rate ratio λ
- slenderness ratio υ - seating coefficient ξ
- relative spring deflection ρ kg/dm³ density τ N/mm² (MPa) uncorrected torsional stress (without the influence of the wire curvature being taken into account)
τ1, τ2 .
N/mm² (MPa) uncorrected torsional stress, for the
spring forces F1, F2 . τc N/mm² (MPa) uncorrected torsional stress, for the solid length Lc SIST EN 13906-1:2014

spring forces F1, F2 . τkH (.) N/mm² (MPa) corrected torsional stress range in fatigue, with the subscript specifying the number of cycles to rupture or the number of ultimate cycles τkn N/mm² (MPa) corrected torsional stress, for the
spring force Fn τkO (.) N/mm² (MPa) corrected maximum torsional stress in fatigue, with the subscript specifying the number of cycles to rupture or the number of ultimate cycles τkU (.) N/mm² (MPa) corrected minimum torsional stress in fatigue, with the subscript specifying the number of cycles to rupture or the number of ultimate cycles
τn N/mm² (MPa) uncorrected torsional stress, for the
spring force Fn τSt N/mm² (MPa) impact stress τzul N/mm² (MPa) permissible static torsional stress 4 Theoretical compression spring diagram The illustration of the compression spring corresponds to Figure 4.1 from EN ISO 2162-1:1996. The theoretical compression spring diagram is given in Figure 1. SIST EN 13906-1:2014

Figure 1 — Theoretical compression spring diagram 5 Design principles Before carrying out design calculations for a spring, the requirements to be met shall be considered, particularly taking into account and defining:  a spring force and corresponding spring deflection or two spring forces and corresponding stroke or a spring force, the stroke and the spring rate,  loading as a function of time: is static or dynamic,  in the case of dynamic loading the total number of cycles, N, to rupture,  operating temperature and permissible relaxation,
 transverse loading, buckling, impact loading,  other factors (e.g. resonance vibration, corrosion). SIST EN 13906-1:2014

6.1 General Before carrying out design calculations, it should be specified whether they will be subjected to static loading, quasi-static loading, or dynamic loading. 6.2 Static and/or quasi-static loading
A static loading is:  a loading constant in time. A quasi-static loading is:  a loading variable with time with a negligibly small torsional stress range (stroke stress) (e.g. torsional stress range up to 0,1 × fatigue strength);  a variable loading with greater torsional stress range but only a number of cycles of up to 104. 6.3 Dynamic loading In the case of compression springs dynamic loading is: Loadin
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