Disc springs - Quality specifications - Dimensions

This standard specifies the set of requirements that ensure the correct functioning of disc spring. These include requirements relating to the materials and manufacturing process, tolerances on dimensions and spring forces, and also the permissible relaxation and fatigue life of such springs as a function of stress.
All requirements specified here are minimum requirements.
This standard covers three dimensional series of disc springs.
NOTE   In this standard, disc springs are divided into three groups and three dimensional series. Classification into groups is based on the manufacturing process, which is a function of the material thickness. The assignment of disc springs to dimensional series is governed by the h0 /t ratio.

Tellerfedern - Qualitätsanforderungen - Maße

Diese Norm legt die Anforderungen fest, die Tellerfedern erfüllen müssen, damit ihre ordnungsgemäße Funktion sichergestellt ist. Dazu gehören Anforderungen an Werkstoffe und Herstellungsprozesse, Grenzabmaße und Federkrafttoleranzen sowie die zulässige Relaxation und Lebensdauer solcher Federn in Abhängigkeit von der Beanspruchung.
Bei den hier genannten Anforderungen handelt es sich um Mindestanforderungen.
Diese Norm beinhaltet drei Maßreihen von Tellerfedern.
ANMERKUNG   In dieser Norm werden Tellerfedern in drei Gruppen und drei Maßreihen unterteilt. Die Unterteilung in Gruppen liegt dem Herstellungsprozess und der damit verbundenen Materialdicke zugrunde. Die Einteilung der Tellerfedern in Maßreihen erfolgt in Abhängigkeit des Verhältnisses h0/t.

Rondelles ressorts - Spécification de qualité - Dimensions

La présente norme spécifie l'ensemble des exigences garantissant le bon fonctionnement de la rondelle ressort. Celles-ci se rapportent notamment aux matériaux et au procédé de fabrication, aux tolérances relatives aux dimensions et aux tensions du ressort, ainsi qu'à la relaxation et à la résistance à la fatigue admissibles pour de tels ressorts en tant que fonction de la contrainte.
Toutes les exigences spécifiées dans la présente norme sont des exigences minimales.
La présente norme couvre trois séries dimensionnelles de rondelles ressorts.
NOTE   Dans la présente norme, les rondelles ressorts sont classées en trois groupes et en trois séries dimensionnelles. La classification en groupes découle du procédé de fabrication en fonction de l'épaisseur du matériau employé. La série dimensionnelle des rondelles ressorts est déterminée par le rapport h0/t.

Krožnikaste vzmeti - Specifikacije kakovosti - Mere

Ta standard določa sklop zahtev, ki zagotavljajo pravilno delovanje krožnikastih vzmeti. Sem spadajo zahteve glede materialov in postopka izdelave, tolerance za mere in sile vzmeti ter dovoljena razbremenitev in čas obrabe take vzmeti, ki je posledica obremenitve.
Vse zahteve, navedene v tem standardu, so minimalne zahteve.
Ta standard zajema tri dimenzijske skupine krožnikastih vzmeti.
OPOMBA: v tem standardu so krožnikaste vzmeti razdeljene v tri skupine in tri dimenzijske skupine. Razdelitev v skupine je odvisna od postopka izdelave, ki je odvisen od debeline materiala. Razdelitev krožnikastih vezi v dimenzijske skupine je odvisna od razmerja h0 /t.

General Information

Status
Published
Publication Date
15-Nov-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
16-Nov-2016
Completion Date
16-Nov-2016

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Krožnikaste vzmeti - Specifikacije kakovosti - MereTellerfedern - Qualitätsanforderungen - MaßeRondelles ressorts - Spécification de qualité - DimensionsDisc springs - Quality specifications - Dimensions21.160VzmetiSpringsICS:Ta slovenski standard je istoveten z:EN 16983:2016SIST EN 16983:2017en,fr,de01-januar-2017SIST EN 16983:2017SLOVENSKI

STANDARD
SIST EN 16983:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16983
November
t r s x ICS
t sä s x r English Version

Disc springs æ Quality specifications æ Dimensions Rondelles ressorts æ Spßcification de qualitß æ Dimensions

Tellerfedern æ Qualitätsanforderungen æ Maße This European Standard was approved by CEN on

s w August
t r s xä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s x { z uã t r s x ESIST EN 16983:2017
EN 16983:2016

(E) 2 Contents Page European foreword ....................................................................................................................................................... 3 1 Scope .................................................................................................................................................................... 4 2 Normative references .................................................................................................................................... 4 3 Terms, definitions, symbols, units and abbreviated terms ............................................................. 4 3.1 Terms and definitions ................................................................................................................................... 4 3.2 Symbols, units and abbreviated terms .................................................................................................... 5 4 Dimensions and designation ....................................................................................................................... 6 4.1 General ................................................................................................................................................................ 6 4.2 Disc spring groups .......................................................................................................................................... 6 4.3 Dimensional series ......................................................................................................................................... 7 5 Spring material ................................................................................................................................................ 7 6 Spring dimensions, nominal sizes, design values ................................................................................ 7 6.1 Dimensional series A ..................................................................................................................................... 7 6.2 Dimensional series B ..................................................................................................................................... 8 6.3 Dimensional series C ...................................................................................................................................... 9 7 Manufacture ................................................................................................................................................... 10 7.1 Manufacturing process and surface quality ....................................................................................... 10 7.2 Heat treatment .............................................................................................................................................. 11 7.3 Shot peening ................................................................................................................................................... 11 7.4 Presetting ........................................................................................................................................................ 11 7.5 Surface treatment and corrosion protection ..................................................................................... 11 8 Tolerances ...................................................................................................................................................... 12 8.1 Tolerances on diameter ............................................................................................................................. 12 8.2 Tolerances on thickness ............................................................................................................................ 12 8.3 Tolerances on free overall height, l0 ..................................................................................................... 12 8.4 Tolerances on spring load ......................................................................................................................... 13 8.4.1 Single disc springs ........................................................................................................................................ 13 8.4.2 Springs stacked in series ........................................................................................................................... 13 8.5 Clearance between disc spring and guiding element ...................................................................... 14 9 Creep and relaxation ................................................................................................................................... 14 10 Permissible stresses.................................................................................................................................... 16 10.1 Static and rarely alternating loading .................................................................................................... 16 10.2 Dynamic loading ........................................................................................................................................... 16 10.2.1 General ............................................................................................................................................................. 16 10.2.2 Permissible loading ..................................................................................................................................... 17 11 Testing .............................................................................................................................................................. 19 11.1 General ............................................................................................................................................................. 19 11.2 Check of dimensions and other spring characteristics .................................................................. 19 11.3 Hardness testing ........................................................................................................................................... 20 12 Other relevant requirements ................................................................................................................... 20 Bibliography ................................................................................................................................................................. 21 SIST EN 16983:2017

EN 16983:2016 (E) 3

European foreword This document (EN 16983:2016) has been prepared by Technical Committee CEN/TC 407 “Cylindrical helical springs made from round wire and bar - Calculation and design”, 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 2017, and conflicting national standards shall be withdrawn at the latest by May 2017. 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 2093 “Disc springs – Quality specifications – Dimensions”, 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 shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 16983:2017

EN 16983:2016

(E) 4 1 Scope This standard specifies the set of requirements that ensure the correct functioning of disc spring. These include requirements relating to the materials and manufacturing process, tolerances on dimensions and spring forces, and also the permissible relaxation and fatigue life of such springs as a function of stress. All requirements specified here are minimum requirements. This standard covers three dimensional series of disc springs. NOTE In this standard, disc springs are divided into three groups and three dimensional series. Classification into groups is based on the manufacturing process, which is a function of the material thickness. The assignment of disc springs to dimensional series is governed by the h0 /t ratio. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1654, Copper and copper alloys - Strip for springs and connectors EN 10083 (all parts), Steels for quenching and tempering EN 10089, Hot-rolled steels for quenched and tempered springs - Technical delivery conditions EN 10132-4, Cold rolled narrow steel strip for heat treatment - Technical delivery conditions - Part 4: Spring steels and other applications EN 10151, Stainless steel strip for springs - Technical delivery conditions EN ISO 3269, Fasteners - Acceptance inspection (ISO 3269) EN ISO 6507 (all parts), Metallic materials - Vickers hardness test (ISO 6507) EN ISO 6508 (all parts), Metallic materials - Rockwell hardness test (ISO 6508) 3 Terms, definitions, symbols, units and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definition given in EN ISO 26909 apply. NOTE Disc springs are annular coned elements that offer resistance to a compressive load applied axially. They may be designed as single disc springs or as disc springs stacked in parallel or in series, either singly or in multiples. They may be subjected to both static and fatigue loading, and may have flat bearings. SIST EN 16983:2017

EN 16983:2016 (E) 5 3.2 Symbols, units and abbreviated terms For the purposes of this document, the following symbols, units and abbreviated terms apply. Table 1 — Symbols, units and abbreviated terms Symbol Unit Description De mm Outer diameter of spring Di mm Inner diameter of spring D0 mm Diameter of centre of rotation E MPa Modulus of elasticity F N Spring load Fc N Design spring load when spring is in the flattened position Ft N Test load for length Lt or lt

¿F N Relaxation L0 mm Length of springs stacked in series or in parallel, in the initial position Lc mm Design length of springs stacked in series or in parallel, in the flattened position N

Number of cycles to failure R N/mm Spring rate W N mm Energy capacity of spring h0 mm Initial cone height of springs without flat bearings, h0 = l0

« t h'0 mm Initial cone height of springs with flat bearings, hB"0 = l0
« t' i

Number of disc springs or packets stacked in series l0 mm Free overall height of spring in its initial position lt mm Test length of disc spring, lt = l0

rá y w h0 s mm Deflection of single disc spring s1, s2, s3 ... mm Spring deflections related to spring loads F1, F2, F3… t mm Thickness of single disc spring t ' mm Reduced thickness of single disc spring with flat bearings (group 3) µ

Poisson’s ratio
MPa Design stress
II,
III,

OM MPa Design stresses at the points designated II, III, OM (see Figure 1) h MPa Fatigue stress related to the deflection of springs subject to fatigue loading O MPa Maximum fatigue stress U MPa Minimum fatigue stress H = O U MPa Permanent range of fatigue stress P

Theoretical centre of rotation of disc spring cross section (see Figure 1) V, V B"

Lever arms SIST EN 16983:2017
EN 16983:2016
(E) 6 Symbol Unit Description Ra
Mean surface roughness 4 Dimensions and designation 4.1 General
a) without flat bearings: b) with flat bearings:
Group 1 Group 2

Group 3 Figure 1 — Single disc spring of group 1, 2 or 3 (sectional view), including the relevant points of loading Designation of a disc spring of dimensional series A with an outer diameter, De of 40 mm: Disc spring EN 16983 — A 40 4.2 Disc spring groups Table 2 — Disc spring groups Group t With flat bearings and reduced thickness 1 < 1,25 No 2 1,25

¶ t
¶ 6 No 3 6 < t
¶ 14 Yes SIST EN 16983:2017

EN 16983:2016 (E) 7 4.3 Dimensional series Table 3 — Dimensional series series h0/t A approximately 0,40 B approximately 0,75 C Bý sá u r 5 Spring material Springs complying with this standard shall be made from steel as specified in the EN 10083 series, EN 10089 or EN 10132-4. Carbon steel shall only be used for the manufacture of Group 1 springs (see also Table 7). The design of disc springs made from steel as above shall be based on a modulus of elasticity, E, of 206 000 MPa. The modulus of elasticity and strength property of other materials (e.g. stainless steel for springs in accordance with EN 10151, copper alloys (spring bronze) in accordance with EN 1654) will likely be different. The values given for F

Tables 4 to 6 then cease to apply. In such cases, it is recommended to consult the spring manufacturer. 6 Spring dimensions, nominal sizes, design values 6.1 Dimensional series A Table 4 — Disc springs with ≈18eDt; ≈00,4ht; E = 206 000 MPa; µ = 0,3 Group De Di t or (ta h0 l0 Ft lt b OM h12 H12 s approximately 0,75 h0 s = h0

8 4,2 0,4 0,2 0,6 210 0,45 1 218
«1 605
10 5,2 0,5 0,25 0,75 325 0,56 1 218
«1 595
12,5 6,2 0,7 0,3 1 660 0,77 1 382
«1 666 1 14 7,2 0,8 0,3 1,1 797 0,87 1 308
«1 551
16 8,2 0,9 0,35 1,25 1 013 0,99 1 301
«1 555
18 9,2 1 0,4 1,4 1 254 1,1 1 295
«1 558
20 10,2 1,1 0,45 1,55 1 521 1,21 1 290
«1 560
22,5 11,2 1,25 0,5 1,75 1 929 1,37 1 296
«1 534
25 12,2 1,5 0,55 2,05 2 926 1,64 1091
«1 622
28 14,2 1,5 0,65 2,15 2 841 1,66 1 274
«1 562
31,5 16,3 1,75 0,7 2,45 3 871 1,92 1 296
«1 570
35,5 18,3 2 0,8 2,8 5 187 2,2 1 332
«1 611
40 20,4 2,25 0,9 3,15 6 500 2,47 1 328
«1 595
45 22,4 2,5 1 3,5 7 716 2,75 1 296
«1 534 2 50 25,4 3 1,1 4,1 11 976 3,27 1 418
«1 659
56 28,5 3 1,3 4,3 11 388 3,32 1 274
«1 565
SIST EN 16983:2017
EN 16983:2016

(E) 8 Group De Di t or (ta h0 l0 Ft lt b OM h12 H12 s approximately 0,75 h0 s = h0

63 31 3,5 1,4 4,9 15 025 3,85 1 296
«1 524
71 36 4 1,6 5,6 20 535 4,4 1 332
«1 594
80 41 5 1,7 6,7 33 559 5,42 1 453
«1 679
90 46 5 2 7 31 354 5,5 1 295
«1 558
100 51 6 2,2 8,2 48 022 6,55 1 418
«1 663
112 57 6 2,5 8,5 43 707 6,62 1 239
«1 505
125 64 8 (7,5) 2,6 10,6 85 926 8,65 1 326
«1 708
140 72 8 (7,5) 3,2 11,2 85 251 8,8 1 284c
«1 675
160 82 10 (9,4) 3,5 13,5 138 331 10,87 1 338
«1 753 3
180 92 10 (9,4) 4 14 125 417 11 1 201c
«1 576
200 102 12 (11,25) 4,2 16,2 183 020 13,05 1 227
«1 611
225 112 12 (11,25) 5 17 171 016 13,25 1 137c
«1 489
250 127 14 (13,1) 5,6 19,6 248 828 15,4 1 221c

«1 596 a The values specified for t are nominal values. In the case of springs with flat bearings (cf. Group 3 in Clause 4), the desired spring load, F (where s approximately 0,75 h0), is to be obtained by reducing the thickness of single disc springs, t, which then gives the value tB"ä In the case of dimensional series A and B, tB" approximately

rá { v × t, and in the case of dimensional series C, tB" approximately

rá { x × t. b The values specified apply for the largest calculated tensile stress on the lower edges of the spring. c The values specified apply for t

...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Krožnikaste vzmeti - Specifikacije kakovosti - MereTellerfedern - Qualitätsanforderungen - MaßeRondelles ressorts - Spécification de qualité - DimensionsDisc springs - Quality specifications - Dimensions21.160VzmetiSpringsICS:Ta slovenski standard je istoveten z:FprEN 16983kSIST FprEN 16983:2016en,fr,de01-junij-2016kSIST FprEN 16983:2016SLOVENSKI

STANDARD
kSIST FprEN 16983:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 16983
April
t r s x ICS
t sä s x r English Version

Disc springs æ Quality specifications æ Dimensions Rondelles ressorts æ Spßcification de qualitß æ Dimensions

Tellerfedern æ Qualitätsanforderungen æ Maße This draft European Standard is submitted to CEN members for unique acceptance procedureä It has been drawn up by the

If this draft becomes a European Standardá CEN members are bounwhich stipulate the conditions for giving this European Standard the status of a national standard without any alterationä

This draft European Standard was established by CEN in three ofer language made by translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

Recipients of this draft are invited to submitá with their commentsá notification of any relevant patent rights of which they are aware and to provide supporting documentationä

Warning ã This document is not a European Standardä It is distributed for review and commentsä It is subject to change without notice and shall not be referred to as a European Standardä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä FprEN

s x { z uã t r s x EkSIST FprEN 16983:2016
FprEN16983:2016

(E) 2 Contents Page European foreword ....................................................................................................................................................... 3 1 Scope .................................................................................................................................................................... 4 2 Normative references .................................................................................................................................... 4 3 Terms, definitions, symbols, units and abbreviated terms ............................................................. 4 3.1 Terms and definitions ................................................................................................................................... 4 3.2 Symbols, units and abbreviated terms .................................................................................................... 5 4 Dimensions and designation ....................................................................................................................... 6 4.1 General ................................................................................................................................................................ 6 4.2 Disc spring groups .......................................................................................................................................... 6 4.3 Dimensional series ......................................................................................................................................... 6 5 Spring material ................................................................................................................................................ 7 6 Spring dimensions, nominal sizes, design values ................................................................................ 8 6.1 Dimensional series A ..................................................................................................................................... 8 6.2 Dimensional series B ..................................................................................................................................... 9 6.3 Dimensional series C ................................................................................................................................... 10 7 Manufacture ................................................................................................................................................... 11 7.1 Manufacturing process and surface quality ....................................................................................... 11 7.2 Heat treatment .............................................................................................................................................. 11 7.3 Shot peening ................................................................................................................................................... 12 7.4 Presetting ........................................................................................................................................................ 12 7.5 Surface treatment and corrosion protection ..................................................................................... 12 8 Tolerances ...................................................................................................................................................... 12 8.1 Tolerances on diameter ............................................................................................................................. 12 8.2 Tolerances on thickness ............................................................................................................................ 13 8.3 Tolerances on free overall height, l0 ..................................................................................................... 13 8.4 Tolerances on spring load ......................................................................................................................... 13 8.4.1 Single disc springs ........................................................................................................................................ 13 8.4.2 Springs stacked in series ........................................................................................................................... 14 8.5 Clearance between disc spring and guiding element ...................................................................... 15 9 Creep and relaxation ................................................................................................................................... 15 10 Permissible stresses.................................................................................................................................... 17 10.1 Static and rarely alternating loading .................................................................................................... 17 10.2 Dynamic loading ........................................................................................................................................... 17 10.2.1 General ............................................................................................................................................................. 17 10.2.2 Permissible loading ..................................................................................................................................... 18 11 Testing .............................................................................................................................................................. 20 11.1 General ............................................................................................................................................................. 20 11.2 Check of dimensions and other spring characteristics .................................................................. 20 11.3 Hardness testing ........................................................................................................................................... 20 12 Other relevant requirements ................................................................................................................... 21 Bibliography ................................................................................................................................................................. 22 kSIST FprEN 16983:2016

FprEN16983:2016 (E) 3 European foreword This document (FprEN 16983:2016) has been prepared by Technical Committee CEN/TC 407 “Project Committee - Cylindrical helical springs made from round wire and bar - Calculation and design”, the secretariat of which is held by AFNOR. This document is currently submitted to the Unique Acceptance Procedure. 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 2093 “Disc springs – Quality specifications – Dimensions”, which is known and used in many European countries. kSIST FprEN 16983:2016

FprEN16983:2016

(E) 4 1 Scope This standard specifies the set of requirements that ensure the correct functioning of disc spring. These include requirements relating to the materials and manufacturing process, tolerances on dimensions and spring forces, and also the permissible relaxation and fatigue life of such springs as a function of stress. All requirements specified here are minimum requirements. This standard covers three dimensional series of disc springs. NOTE In this standard, disc springs are divided into three groups and three dimensional series. Classification into groups is based on the manufacturing process, which is a function of the material thickness. The assignment of disc springs to dimensional series is governed by the h0 /t ratio. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1654, Copper and copper alloys - Strip for springs and connectors EN 10083 (all parts), Steels for quenching and tempering EN 10089, Hot-rolled steels for quenched and tempered springs - Technical delivery conditions EN 10132-4, Cold rolled narrow steel strip for heat treatment - Technical delivery conditions - Part 4: Spring steels and other applications EN 10151, Stainless steel strip for springs - Technical delivery conditions EN ISO 3269, Fasteners - Acceptance inspection (ISO 3269) EN ISO 6507 (all parts), Metallic materials - Vickers hardness test (ISO 6507) EN ISO 6508 (all parts), Metallic materials - Rockwell hardness test (ISO 6508) 3 Terms, definitions, symbols, units and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definition given in EN ISO 26909 apply. NOTE Disc springs are annular coned elements that offer resistance to a compressive load applied axially. They may be designed as single disc springs or as disc springs stacked in parallel or in series, either singly or in multiples. They may be subjected to both static and fatigue loading, and may have flat bearings. kSIST FprEN 16983:2016

FprEN16983:2016 (E) 5 3.2 Symbols, units and abbreviated terms Table 1 — Symbols, units and abbreviated terms Symbol Unit Description De mm Outer diameter of spring Di mm Inner diameter of spring D0 mm Diameter of centre of rotation E MPa Modulus of elasticity F N Spring load Fc N Design spring load when spring is in the flattened position Ft N Test load for length Lt or lt

¿F N Relaxation L0 mm Length of springs stacked in series or in parallel, in the initial position Lc mm Design length of springs stacked in series or in parallel, in the flattened position N

Number of cycles to failure R N/mm Spring rate W N mm Energy capacity of spring h0 mm Initial cone height of springs without flat bearings, h0 = l0

« t h0B" mm Initial cone height of springs with flat bearings, hB"0 = l0
« t' i

Number of disc springs or packets stacked in series l0 mm Free overall height of spring in its initial position lt mm Test length of disc spring, lt = l0

rá y w h0 s mm Deflection of single disc spring s1, s2, s3 ... mm Spring deflections related to spring loads F1, F2, F3… t mm Thickness of single disc spring t ' mm Reduced thickness of single disc spring with flat bearings (group 3) µ

Poisson’s ratio
MPa Design stress
II,
III,

OM MPa Design stresses at the points designated II, III, OM (see Figure 1) h MPa Fatigue stress related to the deflection of springs subject to fatigue loading O MPa Maximum fatigue stress U MPa Minimum fatigue stress H =

O U MPa Permanent range of fatigue stress P

Theoretical centre of rotation of disc spring cross section (see Figure 1) V, V B"

Lever arms Ra
Mean surface roughness kSIST FprEN 16983:2016
FprEN16983:2016
(E) 6 4 Dimensions and designation 4.1 General
a) without flat bearings: b) with flat bearings:
Group 1 Group 2

Group 3 Figure 1 — Single disc spring of group 1, 2 or 3 (sectional view), including the relevant points of loading Designation of a disc spring of dimensional series A with an outer diameter, De of 40 mm: Disc spring FprEN 16984 — A 40 4.2 Disc spring groups Table 2 — Disc spring groups Group t With flat bearings and reduced thickness 1 < 1,25 No 2 1,25

¶ t
¶ 6 No 3 6 < t
¶ 14 Yes 4.3 Dimensional series Table 3 — Dimensional series series h0/t A
³ 0,40 B
³ 0,75 C ý1,30 kSIST FprEN 16983:2016

FprEN16983:2016 (E) 7 5 Spring material Springs complying with this standard shall be made from steel as specified in the EN 10083 series, EN 10089 or EN 10132-4. Carbon steel shall only be used for the manufacture of Group 1 springs (see also Table 7). The design of disc springs made from steel as above shall be based on a modulus of elasticity, E, of 206 000 MPa. The modulus of elasticity and strength property of other materials (e.g. stainless steel for springs in accordance with EN 10151, copper alloys (spring bronze) in accordance with EN 1654) will likely be different. The values given for F and Tables 4 to 6 then cease to apply. In such cases, it is recommended to consult the spring manufacturer. kSIST FprEN 16983:2016

FprEN16983:2016

(E) 8 6 Spring dimensions, nominal sizes, design values 6.1 Dimensional series A Table 4 — Disc springs with ≈18eDt; ≈00,4ht; E = 206 000 MPa; µ = 0,3 Group De Di t or (ta h0 l0 Ft lt b OM h12 H12 s

³ 0,75 h0 s = h0
8 4,2 0,4 0,2 0,6 210 0,45 1 218
«1 605
10 5,2 0,5 0,25 0,75 325 0,56 1 218
«1 595
12,5 6,2 0,7 0,3 1 660 0,77 1 382
«1 666 1 14 7,2 0,8 0,3 1,1 797 0,87 1 308
«1 551
16 8,2 0,9 0,35 1,25 1 013 0,99 1 301
«1 555
18 9,2 1 0,4 1,4 1 254 1,1 1 295
«1 558
20 10,2 1,1 0,45 1,55 1 521 1,21 1 290
«1 560
22,5 11,2 1,25 0,5 1,75 1 929 1,37 1 296
«1 534
25 12,2 1,5 0,55 2,05 2 926 1,64 1091
«1 622
28 14,2 1,5 0,65 2,15 2 841 1,66 1 274
«1 562
31,5 16,3 1,75 0,7 2,45 3 871 1,92 1 296
«1 570
35,5 18,3 2 0,8 2,8 5 187 2,2 1 332
«1 611
40 20,4 2,25 0,9 3,15 6 500 2,47 1 328
«1 595
45 22,4 2,5 1 3,5 7 716 2,75 1 296
«1 534 2 50 25,4 3 1,1 4,1 11 976 3,27 1 418
«1 659
56 28,5 3 1,3 4,3 11 388 3,32 1 274
«1 565
63 31 3,5 1,4 4,9 15 025 3,85 1 296
«1 524
71 36 4 1,6 5,6 20 535 4,4 1 332
«1 594
80 41 5 1,7 6,7 33 559 5,42 1 453
«1 679
90 46 5 2 7 31 354 5,5 1 295
«1 558
100 51 6 2,2 8,2 48 0224 6,55 1 4181
«1 663
112 57 6 2,5 8,5 3 707 6,62 239
«1 505
125 64 8 (7,5) 2,6 10,6 85 926 8,65 1 326
«1 708
140 72 8 (7,5) 3,2 11,2 85 251 8,8 1 284c
«1 675
160 82 10 (9,4) 3,5 13,5 138 331 10,87 1 338
«1 753 3
180 92 10 (9,4) 4 14 125 417 11 1 201c
«1 576
200 102 12 (11,25) 4,2 16,2 183 020 13,05 1 227
«1 611
225 112 12 (11,25) 5 17 171 016 13,25 1 137c
«1 489
250 127 14 (13,1) 5,6 19,6 248 828 15,4 1 221c

«1 596 a The values specified for t are nominal values. In the case of springs with flat bearings (cf. Group 3 in Clause 4), the desired spring load, F (where s

³ 0,75 h0), is to be obtained by reducing the thickness of single disc springs, t, which then gives the value tB"ä In the case of dimensional series A and B, tB"

³ 0,94 × t, and in the case of dimensional series C, tB"

³ 0,96 × t. b The values specified apply for the largest calculated tensile stress on the lower edges of the spring. c The values specified apply for the largest calculated tensile stress at the point designated III. kSIST FprEN 16983:2016

FprEN16983:2016 (E) 9 6.2 Dimensional series B Table 5 — Disc springs with ≈28eDt; ≈00,75ht; E = 206 000 MP

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