EN 15800:2008
(Main)Cylindrical helical springs made of round wire - Quality specifications for cold coiled compression springs
Cylindrical helical springs made of round wire - Quality specifications for cold coiled compression springs
This European Standard applies to cylindrical helical compression springs made of round spring wire. Cold coiled compression springs can be made with wire up to about 16 mm diameter. (See also EN 13906-1).
NOTE For springs with wire diameter upper 16 mm up to 20 mm see Annex A
Cylindrical helical springs made of round wire from European Standard materials are subject to the limiting values in Table 1 (see also Annex A):
Table 1
Characteristic Cold coiled compression springs
Wire diameter 0,07 mm ≤ d ≤ 16 mm
Mean coil diameter 0,63 mm ≤ D ≤ 200 mm
Length of unloaded spring Lo ≤ 630 mm
Number of active coils n 2
Spring index 4 ≤w ≤ 20
A specification for the parameters of cold formed helical compression springs is given in Annex B.
Zylindrische Schraubenfedern aus runden Drähten - Gütevorschriften für kaltgeformte Druckfedern
Diese Europäische Norm legt die Gütevorschriften für zylindrische Schraubendruckfedern aus federharten runden Drähten fest. Kaltgeformte Druckfedern können bis zu einem Drahtdurchmesser von etwa 16 mm hergestellt werden. (Siehe auch EN 13906 1.)
Für zylindrische Schraubendruckfedern nach dieser Europäischen Norm gelten die Parameter in Tabelle 1:
Tabelle 1
Charakteristik Kaltgeformte Druckfedern
Draht- oder Stabdurchmesser 0,07 mm < or = d < or = 16 mm
Windungsdurchmesser 0,63 mm < or = D < or = 200 mm
Länge der unbelasteten Feder L0 < or = 630 mm
Anzahl der federnden Windungen n > or = 2
Wickelverhältnis 4 < or = w < or = 20
Die funktionswichtigen Angaben der Parameter für kaltgeformte zylindrische Schraubendruckfedern sind in Anhang B aufgeführt.
Ressorts cylindriques hélicoïdaux en fils ronds - Prescriptions de qualité des ressorts de compression façonnés à froid
La présente Norme européenne s'applique aux ressorts cylindriques de compression hélicoïdaux en fils ronds. Les ressorts de compression façonnés à froid peuvent être fabriqués avec des fils d'un diamètre allant jusqu'à environ 16 mm. (Voir aussi l'EN 13906-1).
Les ressorts cylindriques hélicoïdaux en fils ronds faits à partir des matériaux des Normes européennes sont sujets aux valeurs limites du Tableau 1.
Vijačne valjaste vzmeti iz okrogle žice - Specifikacija kakovosti za hladno oblikovane tlačne vzmeti
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zylindrische Schraubenfedern aus runden Drähten - Gütevorschriften für kaltgeformte DruckfedernRessorts cylindriques hélicoïdaux en fils ronds - Prescriptions de qualité des ressorts de compression façonnés à froidCylindrical helical springs made of round wire - Quality specifications for cold coiled compression springs21.160VzmetiSpringsICS:Ta slovenski standard je istoveten z:EN 15800:2008SIST EN 15800:2009en01-februar-2009SIST EN 15800:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15800December 2008ICS 21.160 English VersionCylindrical helical springs made of round wire - Qualityspecifications for cold coiled compression springsRessorts cylindriques hélicoïdaux en fils ronds -Prescriptions de qualité des ressorts de compressionfaçonnés à froidZylindrische Schraubenfedern aus runden Drähten -Gütevorschriften für kaltgeformte DruckfedernThis European Standard was approved by CEN on 18 October 2008.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 CEN 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 CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15800:2008: ESIST EN 15800:2009
Contents Foreword .3 1 Scope .4 2 Normative references .4 3 Representation .5 4 Definitions, symbols, units and terms .6 5 Requirements .7 5.1 Coiling direction.7 5.2 Spring ends .7 5.3 Solid length Lc .7 5.4 Material .8 5.5 Surface Treatment .8 6 Quality grades .8 6.1 Permissible variations of Quality Grades .8 6.2 Permissible variations of wire diameters d .8 6.3 Permissible variations AD for coil diameter D of unloaded spring .8 6.4 Permissible variations AF for spring force F at given spring length L .9 6.5 Permissible variations AL0 for length L0 of unloaded spring .9 6.6 Permissible variations e1 and e2 of unloaded springs with ends closed and ground . 12 6.7 Production margin . 12 7 Testing . 13 7.1 Static load testing . 13 7.2 Characteristic . 13 7.3 Test load for pressing to solid length (settling testing) . 13 Annex A (informative)
Declaration and formulas . 14 Annex B (informative)
Example - Specification for a Cylindrical Helical Compression Spring . 15 Bibliography . 17
Foreword This document (EN 15800:2008) has been prepared by Technical Committee CEN/TC 378 "Project Committee – Springs", the secretariat of which is held by DIN. 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 June 2009, and conflicting national standards shall be withdrawn at the latest by June 2009. This European Standard has been prepared by the initiative of the Association of the European Spring Federation ESF and is based on the German Standard DIN 2095 "Helical springs made of round wire — Specification for cold coiled compression springs", which is known and used in many European countries. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
1 Scope This European Standard applies to cylindrical helical compression springs made of round spring wire. Cold coiled compression springs can be made with wire up to about 16 mm diameter. (See also EN 13906-1). Cylindrical helical springs made of round wire from European Standard materials are subject to the limiting values in Table 1: Table 1
Characteristic
Cold coiled compression springs Wire diameter 0,07 mm 7 d 7 16 mm Mean coil diameter 0,63 mm 7 D 7 200 mm Length of unloaded spring
Lo 7 630 mm
Number of active coils n ≥ 2
Spring index 4 7w 7 20
A specification for the parameters of cold formed helical compression springs is given in Annex B. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10270-1, Steel wire for mechanical springs — Part 1: Patented cold drawn unalloyed spring steel wire EN 10270-2, Steel wire for mechanical springs — Part 2: Oil hardened and tempered spring steel wire EN 10270-3, Steel wire for mechanical springs — Part 3: Stainless spring steel wire EN 12166, Copper and copper alloys — Wire for general purposes SIST EN 15800:2009
3 Representation Dimensions in millimetres
Figure 1 — Type 1 Spring ends closed and ground (with theoretical characteristic) Figure 2 — Type 2 Spring ends closed
4 Definitions, symbols, units and terms Table 2 Symbols Units Terms aF N Value for determining variations of spring force and spring length (effect of geometry and dimensions) AD mm Permissible variation of coil diameter (De, Di, D) of unloaded spring AF N Permissible variation of spring force F at given spring length L AL0 mm Permissible variation of length L0 of unloaded spring d mm Nominal diameter of wire (or bar) dmax mm Upper deviation of d De mm Outside diameter of spring Dd mm Mandrel diameter (inner guide) Dh mm Sleeve diameter (outer guide) Di mm Inside diameter of spring D = 2ieDD+ mm Mean diameter of spring e1 mm Permissible variation of squareness of the unloaded ground spring e2 mm Permissible variation in parallelism of the ground spring bearing surfaces, measured for De F N Spring force F1, F2…… N Spring forces for the spring lengths L1, L2 (at ambient temperature of 20 °C) Fc th N Theoretical spring force at solid length Lc
NOTE The actual spring force at the solid length is as a rule greater than the
theoretical force. kf — Factor for determining variations of spring force and spring length (effect of active coils) L mm Spring length L0 mm Nominal free length of spring
L1 mm Length at smallest test load F1 L1, L2…… mm Spring lengths for the spring forces F1, F2…. Lc mm Solid length
Ln mm Minimum permissible spring length (depending upon Sa) n — Number of active coils nt — Total number of coils Q — Coefficient of quality grade R = sF∆∆ N/mm Spring rate s1 , s2…. mm Spring deflections, for the spring forces F1, F2…. sc mm Spring deflection for the solid length Lc sh mm Deflection of spring (stroke) between two positions Sa mm Sum of minimum gaps between adjacent active coils at spring length Ln w = dD — Spring index dL0=λ — Slenderness ratio SIST EN 15800:2009
5 Requirements 5.1 Coiling direction Compression springs are generally made with right-hand coiling, or with alternating right-hand and left-hand coiling for nested spring assemblies; in this case the outer spring is usually right-hand coiled. If left-hand coiling for springs is required, this shall be obvious from the note "left-hand coiled" which shall appear in drawings or enquiries and order documents. See Annex B. 5.2 Spring ends The spring ends whereby the spring force is transmitted to the connecting components shall be designed so that the deflection of the spring is as nearly axial as possible in every position of the spring. This is generally achieved by reducing the pitch of one finishing coil at each end. To obtain adequate bearing surfaces perpendicular to the spring axis, the wire ends are ground in accordance with Figure 1. If grinding of the spring ends is found to be inexpedient, the spring should be made according to Figure 2, that means without ground wire ends. In all cases the type of finish for the spring ends shall be stated in one of the contractual documents: descriptive, drawings or enquiries and order documents. See Annex B. If unground spring ends are acceptable for the particular use concerned, e.g. when the compression springs are made of wire having a diameter less than approximately 1 mm or with a spring index over 15, grinding of the wire ends should be omitted for economic reasons. See Annex B. When the compression springs are made of wire having a diameter under 0,3 mm the wire ends should not be ground. With regard to the simultaneous grinding of the spring ends of compression springs having a wire diameter from 0,3 mm up to about 5 mm it should be noted that only springs which allow adequate contact pressure can be ground flat. Tests so far carried out indicate that this contact pressure shall amount to approximately dR≥ 0,03 N/mm2 (1) The spring ends should only be deburred if this is required for proper functioning, and shall be agreed between the spring manufacturer and the customer. This information shall be included in enquiries, drawings, and orders. See Annex B. 5.3 Solid length Lc (all coils are closed) For springs with ground ends according to Figure 1, the solid length is: maxtcdnL⋅≤ (2) For springs without ground ends according to Figure 2, the following applies:
(3) where
nt = n + 2
2 = Number of non-active coils ()max 51d ,nL t c⋅+≤SIST EN 15800:2009
Springs have n 82 coils 5.4 Material The material selection shall be done in line with loading and function of the spring.
The materials covered by this standard are:
a) Patented cold drawn unalloyed spring steel wire to EN 10270-1. b) Oil hardened and tempered spring steel wire to EN 10270-2. c) Stainless spring steel wire to EN 10270-3. d) Wire from copper and copper alloys to EN 12166. 5.5 Surface Treatment 5.5.1 Shot-peening Springs may be shot peened, if agreed between manufacturer and customer. 5.5.2 Surface protection Either organic or inorganic coatings may be applied, if agreed between manufacturer and customer.
6 Quality grades 6.1 Permissible variations of Quality Grades For springs the quality grades 1, 2 and 3 are specified (for coefficients Q see Table 4). All the permissible variations listed below apply only to material given in EN 10270. For materials in EN 12166, permissible variations shall be agreed between manufacturer and customer. The choice between quality grades 1, 2 and 3 is governed by operational requirements. The quality grade required and the permissible variations shall be expressly agreed or stated in the drawing. In the absence of information, quality grade 2 shall apply. In the interests of rationalized production quality grade 1 should be specified only when the particular use calls for it. For this purpose not all the quantities in Subclauses 6.2 to 6.6 necessarily belong to a single quality grade. If variations smaller then "1" are required, agreements shall
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