1、BRITISH STANDARD BS ISO 3601-3:2005 Fluid power systems O-rings Part 3: Quality acceptance criteria ICS 23.100.60; 83.140.50 BS ISO 3601-3:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 1 December 2005 BSI 1 December 2005 ISBN 0 580 472
2、43 4 National foreword This British Standard reproduces verbatim ISO 3601-3:2005 and implements it as the UK national standard. It supersedes BS 6442:1984 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MCE/11, Fluid seals and their housings, which ha
3、s the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the
4、UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards
5、Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does
6、 not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was l
7、ast issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 3601-3:2005(E)INTERNATIONAL STANDARD ISO 3601-3 Second edition 2005-11-01 Fluid power systems O-rings Part 3: Quality acceptance criteria Transmissions hydrauliques et pneumatiques Joints toriques Partie 3: C
8、ritres de qualit BS ISO 3601-3:2005ii BS ISO 3601-3:2005 iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms, definitions and symbols 1 4 Grades 3 4.1 Grade N (general purpose) 3 4.2 Grade S (special) 3 4.3 Grade CS (critical service) . 3 4.4 Selection of grad
9、e. 3 5 Surface condition 3 6 Identification statement (reference to this part of ISO 3601). 4 BS ISO 3601-3:2005 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standa
10、rds is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also tak
11、e part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is
12、 to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibilit
13、y 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. ISO 3601-3 was prepared jointly by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid system
14、s and components, and by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 7, Sealing devices. This second edition cancels and replaces the first edition (ISO 3601-3:1987), which has been technically revised. ISO 3601 consists of the following parts, under the general title Fluid
15、power systems O-rings: Part 1: Inside diameters, cross-sections, tolerances and size identification code Part 3: Quality acceptance criteria Part 5: Suitability of elastomeric materials for industrial applications The following parts are in preparation: Part 2: Housing dimensions for general applica
16、tions Part 4: Anti-extrusion devices (back-up rings) v Introduction In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pressure within an enclosed circuit. Components must be designed to meet these requirements under varying conditions. Testing of compo
17、nents to meet performance requirement provides users a basis of assurance for determining design application and for checking component compliance with their stated requirements. BS ISO 3601-3:2005blank 1 Fluid power systems O-rings Part 3: Quality acceptance criteria 1 Scope This part of ISO 3601 l
18、ays down the quality acceptance criteria of O-rings used in fluid systems, the dimensions of which are standardized in ISO 3601-1, ISO 16031-1 and ISO 16031-2. This part of ISO 3601 also defines and classifies surface imperfections on O-rings and specifies maximum acceptable limits for these imperfe
19、ctions. This part of ISO 3601 is also applicable to O-rings to be used in aerospace construction. 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
20、 edition of the referenced document (including any amendments) applies. ISO 3601-1, Fluid power systems O-rings Part 1: Inside diameters, cross-sections, tolerances and size identification code ISO 5598, Fluid power systems and components Vocabulary ISO 16031-1, Aerospace fluid systems O-rings, inch
21、 series: Inside diameters and cross sections, tolerances and size-identification codes Part 1: Close tolerances for hydraulic systems ISO 16031-2, Aerospace fluid systems O-rings, inch series: Inside diameters and cross sections, tolerances and size-identification codes Part 2: Standard tolerances f
22、or non-hydraulic systems 3 Terms, definitions and symbols For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. 3.1 backrind longitudinal imperfection in which the rubber adjacent to the flash line shrinks below the level of the moulding and has a “U
23、”-like or “W”-like cross section with the flash frequently being ragged or torn see Figure 1 3.2 combined flash combination of offset, flash and parting line projection BS ISO 3601-3:20052 3.3 inside diameter d 1O-ring inside diameter 3.4 cross-section diameter d 2O-ring cross-section diameter 3.5 e
24、xcessive trimming flattened and often roughened area around the inner and/or outer diameters of an O-ring caused by the trimming process see Figures 2a and 2b 3.6 flash film-like material that extends from the parting line projection or inner and/or outer diameters, caused by mould separation or pre
25、sent due to inadequate trimming see Figure 3 3.7 flow mark thread-like recess, usually curved, of very slight depth in the unflexed state, with normal surface texture and round edge, caused by incomplete flow and knit of the material see Figure 4 3.8 foreign material any extraneous matter embedded i
26、n the surface of the O-ring, e.g. contamination, dirt, etc. 3.9 indentation depression, usually irregular in form, caused by the removal of inclusions from the surface or the build-up of hardened deposits on the surface of the mould cavity see Figure 5 3.10 mismatch cross-sectional radius in one rin
27、g half being unequal to that of the other half, caused by dimensional difference in mould halves 3.11 non-fill randomly spaced, irregularly shaped surface indentation having a coarser texture than the normal O-ring surface, caused by incomplete filling of, and or the trapping of air in, the mould ca
28、vity see Figure 6 3.12 off-register misalignment of O-ring halves, caused by the lateral shift of one mould cavity plate relative to other BS ISO 3601-3:20053 3.13 offset mismatch and/or off-register of O-ring halves see Figure 7 3.14 parting-line indentation shallow saucer-like recess sometimes tri
29、angular in shape, located on the parting line at the inner and/or outer diameters, caused by deformation of the mould edge at the parting line 3.15 parting-line projection continuous ridge of material situated at the parting line of inner and/or outer diameters caused by worn or excessively rounded
30、edges of the mould cavity 4 Grades 4.1 Grade N (general purpose) Grade N (general purpose) identifies acceptance criteria for O-rings intended for general use. See Table 1. 4.2 Grade S (special) Grade S (special) identifies acceptance criteria for O-rings intended for applications requiring a higher
31、 level of quality and/or precision with respect to dimensional tolerances of surface imperfections. For example, aerospace or critical industrial or automotive applications are covered by this grade. See Table 2. 4.3 Grade CS (critical service) This grade identifies acceptance criteria for O-rings i
32、ntended for applications requiring a much higher level of quality and/or precision with respect to dimensional tolerances of surface imperfections. For example, critical service aerospace or medical applications, where the surface of the O-ring must be near-perfect to perform in a satisfactory manne
33、r, are covered by this grade. See Table 3. 4.4 Selection of grade If the user does not specify the grade at the time of purchase, Grade N will be assumed to be the quality requirement, except for specific aerospace applications where Grade S will be assumed to be the quality requirement. 5 Surface c
34、ondition 5.1 The O-ring surfaces shall be free from cracks, ruptures, blisters or other imperfections that are greater than the limits given in Tables 1, 2 and 3 when the unstretched ring is viewed under a 2 magnifier viewer with adequate illumination. Other methods should be agreed between the manu
35、facturer and the user. 5.2 There shall be no foreign material embedded in the surface visible under the viewing conditions given in 5.1. BS ISO 3601-3:20054 5.3 Flow marks, non-fills and indentations within the limits of Tables 1, 2 and 3 shall not be allowed if a) there are more than three in any 2
36、5 mm length of circumference for Grades N and S or there is more than one in any 25 mm length of circumference for Grade CS; b) they interconnect; c) there are more than three that are separated from each other by a distance that is less than the maximum limiting dimensions of such imperfection for
37、Grades N and S, or there are more than two that are separated from each other by a distance that is less than the maximum limiting dimensions of such imperfection and only one per 25 mm length of circumference for Grade CS. 5.4 There shall be no flow marks that are essentially radially orientated. 5
38、.5 The surface resulting from any excessive trimming shall be smoothly blended. 5.6 Wire gauges of the appropriate size may be used to determine the size of the defect by comparison. 5.7 In case of dispute, the methods of measurement shall be agreed upon between the manufacturer and the customer. 6
39、Identification statement (reference to this part of ISO 3601) Use the following statement in test reports, catalogues and sales literature when electing to comply with this part of ISO 3601: “Surface imperfection limits are in accordance with ISO 3601-3:2005, Fluid power systems O-rings Part 3: Qual
40、ity acceptance criteria.” BS ISO 3601-3:20055 Table 1 Limits of size for surface imperfections for Grade N O-rings Dimensions in millimetres Maximum limits of imperfections Grade N O-rings Cross-section, d 2 Surface imperfection type Diagrammatic representation Limiting dimensions 0,8 b u 2,25 2,25
41、u 3,15 3,15 u 4,50 4,50 u 6,30 6,30 u 8,40 b Off-register, mismatch (offset) e 0,08 0,10 0,13 0,15 0,15 x 0,10 0,12 0,14 0,16 0,18 y 0,10 0,12 0,14 0,16 0,18 Combined flash (combination of offset, flash and parting line projection) a When the flash can be differentiated, it shall not exceed 0,07 mm.
42、 g 0,18 0,27 0,36 0,53 0,70 Backrind u 0,08 0,08 0,10 0,10 0,13 Excessive trimming (radial tool marks not allowed) n Trimming is allowed provided the dimension n is not reduced below the minimum diameter d 2for the O-ring. v 1,50 a 1,50 a6,50 a6,50 a6,50 aFlow marks (radial orientation of flow marks
43、 is not permissible) k 0,08 0,08 0,08 0,08 0,08 w 0,60 0,80 1,00 1,30 1,70 Non-fills and indentations (including parting line indentations) t 0,08 0,08 0,10 0,10 0,13 aOr 0,05 times the O-rings inside diameter (d 1 ), whichever is greater. bLimits of imperfections for cross sections 8,40 mm shall be
44、 agreed upon between manufacturer and customer. cRound edges. BS ISO 3601-3:20056 Table 2 Limits of size for surface imperfections for Grade S O-rings Dimensions in millimetres Maximum limits of imperfections Grade N O-rings Cross-section d 2Surface imperfection type Diagrammatic representation Limi
45、ting dimensions 0,8 b u 2,25 2,25 u 3,15 3,15 u 4,50 4,50 u 6,30 6,30 u 8,40 b Off-register, mismatch (offset) e 0,08 0,08 0,10 0,12 0,13 x 0,10 0,10 0,13 0,15 0,15 y 0,10 0,10 0,13 0,15 0,15 Combined flash (combination of offset, flash and parting line projection) a When the flash can be differenti
46、ated, it shall not exceed 0,05 mm. g 0,10 0,15 0,20 0,20 0,30 Backrind u 0,05 0,08 0,10 0,10 0,13 Excessive trimming (radial tool marks not allowed) n Trimming is allowed provided the dimension n is not reduced below the minimum diameter d 2for the O-ring. v 1,50 a 1,50 a5,00 a5,00 a5,00 aFlow marks
47、 (radial orientation of flow marks is not permissible) k 0,05 0,05 0,05 0,05 0,05 w 0,15 0,25 0,40 0,63 1,00 Non-fills and indentations (including parting line indentations) t 0,08 0,08 0,10 0,10 0,13 aOr 0,05 times the O-rings inside diameter (d 1 ), whichever is greater. bLimits of imperfections f
48、or cross sections 8,40 mm shall be agreed upon between manufacturer and customer. cRound edges. BS ISO 3601-3:20057 Table 3 Limits of size for surface imperfections for Grade CS O-rings Dimensions in millimetres Maximum limits of imperfections Grade N O-rings Cross-section d 2Surface imperfection ty
49、pe Diagrammatic representation Limiting dimensions 0,8 b u 2,25 2,25 u 3,15 3,15 u 4,50 4,50 u 6,30 6,30 u 8,40 b Off-register, mismatch (offset) e 0,04 0,04 0,06 0,06 0,08 x 0,07 0,07 0,10 0,13 0,13 y 0,10 0,10 0,13 0,13 0,13 Combination of offset and parting line projection a Not permissible g Not permissible Backrind u Not permissible Excessive trimming (radial tool marks not allowed) n Trimming is allowed provided th
