1、August 2010 Translation by DIN-Sprachendienst.English price group 9No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、23.100.60!$jB4“1713117www.din.deDDIN ISO 3601-3Fluid power systems O-Rings Part 3: Quality acceptance criteria (ISO 3601-3:2005)English translation of DIN ISO 3601-3:2010-08Fluidtechnik O-Ringe Teil 3: Form- und Oberflchenabweichungen (ISO 3601-3:2005)Englische bersetzung von DIN ISO 3601-3:2010-08T
3、ransmissions hydrauliques et pneumatiques Joints toriques Partie 3: Critres de qualit (ISO 3601-3:2005)Traduction anglaise de DIN ISO 3601-3:2010-08SupersedesDIN 3771-4:1984-12www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 15 pages08.1
4、0 DIN ISO 3601-3:2010-08 A comma is used as the decimal marker. Contents Page National foreword .3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms, definitions and symbols.5 4 Grades.7 4.1 Grade N (general purpose)7 4.2 Grade S (special).7 4.3 Grade CS (critical service).7 4.4 Selection o
5、f grade7 5 Surface condition.7 6 Identification statement (reference to this part of ISO 3601)8 2 Start of validity This standard takes effect on 1 August 2010. National foreword This standard has been prepared by Technical Committee ISO/TC 131 “Fluid power systems”, Subcommittee SC 7 “Sealing devic
6、es”, Working Group WG 3 “Fluid power systems and components Sealing devices The responsible German body involved in its preparation was the Normenausschuss Maschinenbau (Mechanical Engineering Standards Committee), Working Committee NA 060-36-73 AA O-Ringe of section Fluidtechnik. After Parts 1, 2 a
7、nd 4 of the ISO 3601 series of standards were published in 2008, Working Committee NA 060-36-73 AA O-Ringe decided to adopt the series as national standards. As a result, Part 3 of ISO 3601, which had been published in 2005, has been published as DIN ISO 3601-3, and DIN 3771-4:1984-12 has been withd
8、rawn. International Standards referred to in this standard have been published as the corresponding DIN ISO or DIN EN ISO Standards with the same number. For ISO 5598, ISO 16031-1 and ISO 16031-2 there are no national standards available. Amendments This standard differs from DIN 3771-4:1984-12 as f
9、ollows: a) Grade CS for critical service has been added. b) Tolerances are now specified for ranges of cross-sections, not only for standard cross-sections, so that customized O-rings with non-standard cross-sections can now be used. Previous editions DIN 3771-4: 1984-12 3 DIN ISO 3601-3:2010-08 Des
10、ign criteria for standard O-ring applications”. 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 components t
11、o meet performance requirement provides users a basis of assurance for determining design application and for checking component compliance with their stated requirements. Fluid power systems O-Rings Part 3: Quality acceptance criteria 4 DIN ISO 3601-3:2010-08 1 Scope This part of ISO 3601 lays down
12、 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 imperfections.
13、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 edition
14、 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 series:
15、 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 for non-h
16、ydraulic 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”-like o
17、r “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 5 DIN ISO 3601-3:2010-08 3.3 inside diameter d1O-ring inside diameter 3.4 cross-section diameter d2O-ring cross-section diameter 3.5 excess
18、ive 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 present
19、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 in the
20、 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 ring hal
21、f 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 cavity
22、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 6 DIN ISO 3601-3:2010-08 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
23、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
24、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
25、 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
26、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
27、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
28、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
29、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. 7 DIN ISO 3601-3:2010-08 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
30、any 25 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
31、 for 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 orientat
32、ed. 5.5 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 custome
33、r. 6 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:
34、 Quality acceptance criteria.” 8 DIN ISO 3601-3:2010-08 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, d2Surface imperfection type Diagrammatic representation Limiting dimensions 0,8bu 2,25
35、 2,25 u 3,15 3,15 u 4,50 4,50u 6,30 6,30u 8,40bOff-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 m
36、m. 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 d2for the O-ring. v 1,50a1,50a6,50a6,50a6,50aFlow marks (radial orientation of flow marks is n
37、ot 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 (d1), whichever is greater. bLimits of imperfections for cross sections 8,40 mm shall be agreed
38、 upon between manufacturer and customer. cRound edges. 9 DIN ISO 3601-3:2010-08 Table 2 Limits of size for surface imperfections for Grade S O-rings Dimensions in millimetres Maximum limits of imperfections Grade S O-rings Cross-section d2Surface imperfection type Diagrammatic representation Limitin
39、g dimensions 0,8bu 2,25 2,25u 3,15 3,15 u 4,50 4,50 u 6,30 6,30u 8,40bOff-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 differentiated, it
40、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 d2for the O-ring. v 1,50a1,50a5,00a5,00a5,00aFlow marks (radial orienta
41、tion 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 (d1), whichever is greater. bLimits of imperfections for cross sections
42、8,40 mm shall be agreed upon between manufacturer and customer. cRound edges. 10 DIN ISO 3601-3:2010-08 Table 3 Limits of size for surface imperfections for Grade CS O-rings Dimensions in millimetres Maximum limits of imperfections Grade CS O-rings Cross-section d2Surface imperfection type Diagramma
43、tic representation Limiting dimensions 0,8bu 2,25 2,25 u 3,15 3,15 u 4,50 4,50u 6,30 6,30u 8,40bOff-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 Backr
44、ind u Not permissible Excessive trimming (radial tool marks not allowed) n Trimming is allowed provided the dimension n is not reduced below the minimum diameter d2for the O-ring. v 1,50a1,50a1,50a4,56a4,56aFlow marks (radial orientation of flow marks is not permissible) k 0,05 0,05 0,05 0,05 0,05 1
45、1 DIN ISO 3601-3:2010-08 Table 3 (continued) Dimensions in millimetres Maximum limits of imperfections Grade CS O-rings Cross-section d2Surface imperfection type Diagrammatic representation Limiting dimensions 0,8bu 2,25 2,25u 3,15 3,15 u 4,50 4,50 u 6,30 6,30u 8,40bw 0,08 0,13 d0,13 0,25 d0,18 0,38
46、 d0,25 0,51d0,38 0,76dNon-fills and indentations (including parting line indentations) t 0,08 0,08 0,10 0,10 0,13 a Or 0,03 times the O-rings inside diameter (d1), whichever is greater, subject to a maximum of 30 mm. b Limits of imperfections for cross sections 8,40 mm shall be agreed upon between m
47、anufacturer and customer. c Round edges. d Mould deposit indentations only. aUnacceptable for CS O-rings; acceptable within dimensional limits for N and S O-rings. Figure 1 Backrind 12 DIN ISO 3601-3:2010-08 Figure 2A Illustration of acceptable excessive trimming Figure 2B Illustration of unacceptab
48、le excessive trimming aUnacceptable for CS O-rings. Figure 3 Flash 13 DIN ISO 3601-3:2010-08 aRadial orientation of flow mark is unacceptable. bAcceptable within dimensional limits. Figure 4 Flow marks aAcceptable within dimensional limits. aAcceptable within dimensional limits. Figure 5 Mould deposit indentation Figure 6 Non-fills, inclusions and indentations 14 DIN ISO 3601-3:2010-08 aAcceptable within dimensional limits. Figure 7 Off-register / mismatch 15 DIN ISO 3601-3:2010-08
