ISO/FDIS 22705-1

DRAFT INTERNATIONAL STANDARD
ISO/DIS 22705-1
ISO/TC 227 Secretariat: JISC
Voting begins on: Voting terminates on:
2020-01-27 2020-04-20
Springs — Measurement and test parameters —
Part 1:
Cold formed cylindrical helical compression springs
Ressort — Mesures et paramètres de test —
Partie 1: Ressort hélicoïdal de compression cylindriques formé à froid
ICS: 21.160
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NATIONAL REGULATIONS.
ISO/DIS 22705-1:2020(E)
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Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms, definitions, symbols and abbreviated terms ....................................................................................................... 1

3.1 Terms and definitions ....................................................................................................................................................................... 1

3.2 Symbols and abbreviated terms............................................................................................................................................... 2

4 Environmental conditions .......................................................................................................................................................................... 3

5 Qualifications of the person(s) performing the work ................................................................................................... 3

6 Geometries of guiding and supporting devices .................................................................................................................... 3

7 Measuring and testing equipment ..................................................................................................................................................... 3

compression springs ........................................................................................................................................................................................ 4

8.1 Free length (L )....................................................................................................................................................................................... 4

8.1.1 General...................................................................................................................................................................................... 4

8.1.2 Type of characteristic .................................................................................................................................................. 4

8.1.3 Measuring and/or testing equipment ........................................................................................................... 4

8.1.4 Time of measurement and testing .................................................................................................................... 4

8.1.5 Method of measurement and testing ............................................................................................................. 4

8.1.6 Test location on the product .................................................................................................................................. 6

8.2 Outside diameter (D ) ....................................................................................................................................................................... 6

8.2.1 General...................................................................................................................................................................................... 6

8.2.2 Type of characteristic .................................................................................................................................................. 6

8.2.3 Measurement and/or testing equipment ................................................................................................... 6

8.2.4 Time of measurement and testing .................................................................................................................... 6

8.2.5 Method of measurement and testing ............................................................................................................. 7

8.2.6 Test location on the product .................................................................................................................................. 9

8.3 Internal diameter (D ) ....................................................................................................................................................................... 9

8.3.1 General...................................................................................................................................................................................... 9

8.3.2 Type of characteristic .................................................................................................................................................. 9

8.3.3 Measuring and/or testing equipment ........................................................................................................... 9

8.3.4 Time of measurement and testing .................................................................................................................... 9

8.3.5 Method of measurement and testing ..........................................................................................................10

8.3.6 Test location on the product ...............................................................................................................................11

8.4 Total number of coils (n ), number of active coils (n) and coil direction ...........................................12

8.4.1 General...................................................................................................................................................................................12

8.4.2 Type of characteristic ...............................................................................................................................................12

8.4.3 Measuring and/or testing equipment ........................................................................................................14

8.4.4 Time of measurement and testing .................................................................................................................14

8.4.5 Method of measurement and testing ..........................................................................................................14

8.4.6 Test location on the product ...............................................................................................................................14

8.5 Applied end coils ................................................................................................................................................................................15

8.5.1 General...................................................................................................................................................................................15

8.5.2 Type of characteristic ...............................................................................................................................................15

8.5.3 Measuring and/or testing equipment ........................................................................................................15

8.5.4 Time of measurement and testing .................................................................................................................15

8.5.5 Method of measurement and testing ..........................................................................................................15

8.5.6 Test location on the product ...............................................................................................................................15

8.6 Solid length (L )/solid force (F ) ..........................................................................................................................................16

8.6.1 General...................................................................................................................................................................................16

8.6.2 Type of characteristics .............................................................................................................................................16

8.6.3 Measuring and/or testing equipment ........................................................................................................16

8.6.4 Time of measurement and testing .................................................................................................................16

8.6.5 Method of measurement and testing ..........................................................................................................16

8.6.6 Test location on the product ...............................................................................................................................17

8.7 Spring load (F) ......................................................................................................................................................................................17

8.7.1 General...................................................................................................................................................................................17

8.7.2 Type of characteristic ...............................................................................................................................................17

8.7.3 Measuring and/or testing equipment ........................................................................................................18

8.7.4 Time of measurement and testing .................................................................................................................18

8.7.5 Method of measurement and testing ..........................................................................................................18

8.7.6 Test location on the product ...............................................................................................................................18

8.8 Spring pitch/distance between the coils .......................................................................................................................19

8.8.1 General...................................................................................................................................................................................19

8.8.2 Type of characteristic ...............................................................................................................................................19

8.8.3 Measuring and/or testing equipment ........................................................................................................19

8.8.4 Time of measurement and testing .................................................................................................................19

8.8.5 Method of measurement and testing ..........................................................................................................19

8.8.6 Test location on the product ...............................................................................................................................20

8.9 Grinding surface/angle .................................................................................................................................................................20

8.9.1 General...................................................................................................................................................................................20

8.9.2 Type of characteristic ...............................................................................................................................................20

8.9.3 Measuring and/or testing equipment ........................................................................................................20

8.9.4 Time of measurement and testing .................................................................................................................21

8.9.5 Method of measurement and testing ..........................................................................................................21

8.9.6 Test location on the product ...............................................................................................................................21

8.10 Perpendicularity (e ) ......................................................................................................................................................................21

8.10.1 General...................................................................................................................................................................................21

8.10.2 Type of characteristic ...............................................................................................................................................22

8.10.3 Measuring and/or testing equipment ........................................................................................................22

8.10.4 Time of measurement and testing .................................................................................................................22

8.10.5 Method of measurement and testing ..........................................................................................................22

8.10.6 Test location on the product ...............................................................................................................................23

8.11 Parallelism (e ) ....................................................................................................................................................................................23

8.11.1 General...................................................................................................................................................................................23

8.11.2 Type of characteristic ...............................................................................................................................................23

8.11.3 Measuring and/or testing equipment ........................................................................................................23

8.11.4 Time of measurement and testing .................................................................................................................24

8.11.5 Method of measurement and testing ..........................................................................................................24

8.11.6 Test location on the product ...............................................................................................................................24

8.12 Shear-off burr ........................................................................................................................................................................................24

8.12.1 General...................................................................................................................................................................................24

8.12.2 Type of characteristic ...............................................................................................................................................24

8.12.3 Measuring and/or testing equipment ........................................................................................................25

8.12.4 Time of measurement ..............................................................................................................................................25

8.12.5 Method of measurement and testing ..........................................................................................................25

8.12.6 Test location on the product ...............................................................................................................................26

Annex A (informative) Calculation of spring rate R ............................................................................................................................27

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

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The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

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Any feedback or questions on this document should be directed to the user’s national standards body. A

This document specifies the measurement and test methods excluding dynamic testing for general

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.

ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for

ISO 13385-1, Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1:

For the purpose of this document, the terms and definitions given in ISO 26909 and the following apply.

mechanical device designed to store energy when deflected and to return the equivalent amount of

Note 1 to entry: In the narrow sense, a compression spring indicates a helical compression spring.

compression spring made of wire of circular cross-section, wound around an axis with spaces between

[SOURCE: ISO 26909:2009, 3.12, modified — limited to wires with circular cross-section]

Note 1 to entry: This is the number of coils used in computing the total deflection of a spring.

parameter with a tolerance for which there is an immediate conclusion after test (OK or not OK)

Note 1 to entry: Test can be done without measurement (i. e. with go/no-go gauges)

Table 1 includes symbols, units and abbreviated terms in accordance with ISO 16249 and used

s , s ,… mm specified spring deflections for the specified spring loads, F , F ,…

The spatial distribution and equipment of the facility shall permit a reliable implementation of the

Measurements and tests should be carried out at ambient temperature in a normal workshop

Special tests (e.g. in air-conditioned rooms or other special environments) shall be agreed upon

The measurements and tests shall be carried out by a person who has been instructed/trained in the

use of the measuring and testing equipment, as well as regarding methods and test requirements.

The qualifications or additional knowledge and skills should be documented in appropriate qualification

If guiding and supporting devices (mandrels, guide sleeves, ring groove, etc.) are used, the properties

(geometry, material, etc.) shall be agreed upon between the manufacturer and the customer to include

special cases such as snapping end coils, buckling, bulging, etc. The alignment of guiding and supporting

Suitable measuring equipment shall be selected. Measuring equipment shall conform to ISO standards,

If there is a customer requirement, the methods and measuring equipment shall be agreed on separately.

L is the length across the entire spring body when no load is applied and only for the case that both

ends are ground (see Figure 1); other cases should be agreed upon between the manufacturer and the

— optical measuring instruments/protractor/measurement microscope/camera systems;

The measurement can be carried out without contact using optical procedures, capacitive or electrically

by contact (with minimal force) or by contact with the measuring surfaces (at a known/unknown

measuring force). Preferably, the measurement should be carried out over the entire face (see Figure 2

and Figure 3). If this is not possible, then a second measurement can be carried out with a 90° offset. In

this case, it shall be clarified whether the maximum value, the minimum value or the average value is to

When there is a spring self-weight effect, the measurement of free height should be agreed upon

a) Tolerance upper limit check with gauge, b) Tolerance upper limit check with gauge,

c) Tolerance lower limit check with gauge d) Tolerance lower limit check with gauge

If the customer specifies a setting length for the test spring, the setting condition for the test spring

Springs that are not preset shall only be measured after the force test, or they shall be set to the length

L (F ) before the test. If no load or force is specified, measurement can be done without any

a) Measurement of a parallel spring (both ends are b) Measurement of a spring (one end open and one