1、 AEROSPACESTANDARD AS5752 Issued 2009-05 Reaffirmed 2014-07 Aerospace - Visual Inspection Standard for Elastomeric Sealing Elements Other than O-Rings RATIONALE AS5752 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE This standard provides the following: a. The required s
2、urface finish criteria for the designed function of the parts b. The definition of surface imperfections and defects that affect surface quality c. The categories by location for each geometry for the permissible type, size and quantity of defects It also establishes the quantitative levels of accep
3、tance by providing defined limits and inspection guidance for the acceptance or rejection of production parts This specification is applicable but not limited to, the surface quality of: T-Seals L-Rings Capped T Rings Capped L Rings Cammed Type Seals Cruciform Shaped Elastomers Pyramid (Dyna-Bak) Se
4、als Square Ring Seals Quadruple Lobed Seals U-Cups Spring Energized U-Cups Molded in Place Metal Gasket Seals _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary,
5、 and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites
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8、.sae.org/technical/standards/AS5752 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of
9、the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 ISO Documents Int
10、ernational Standards Organization Standards: Available from American National Standards Institute 25 west 43rdStreet, New York, NY 10036-8002. Tel: 212-642-4900, www.ansi.org. ISO 3601-3 Fluid Power Systems O-Rings, Part 3 Quality Acceptance Criteria. 3. SEAL ELEMENT/PRODUCT NOTE: Graphical depictio
11、ns of individual seal geometries with their corresponding classification of imperfections by location are shown in Appendix A. With the exception of molded-in-place gasket type seals, each type of seal cross section may have as many as 4 configurations as identified below: a. Radial Piston Type Seal
12、 b. Radial Rod Type Seal c. Internal Pressure Face Type Seal d. External Pressure Face Type Seal In addition, some seals may be molded for custom applications, such as mounting on a ball swivel, in which case the cross-section would be rotated through an angle. 4. CLASSIFICATIONS OF IMPERFECTIONS 4.
13、1 The classification of imperfections is broken down into three parts a. Geometric location (Area) for Major, Significant and Minor requirements as defined in Table 1 and as depicted in each cross section sketch per Appendix A b. Type of imperfection as described in ISO 3601-3 c. Magnitude of each i
14、mperfection and acceptance level per Table 1 4.1.1 Type. Where critical criteria are deemed necessary, per Table 1, Type 1 to this specification shall be specified. Type 2 criteria shall be used for normal applications. If the Type is not specified, Type 2 criteria shall apply. SAE INTERNATIONAL AS5
15、752 Page 2 of 13_ TABLE 1. - DEFINITIONS OF MAJOR, SIGNIFICANT AND MINOR AREAS Symbol Class Definition, Type 1 Definition, Type 2 MAJOR (1) Area 1 This area is the direct sealing surface in contact with mating metal or other parts (such as PTFE caps) to be sealed and should be of high quality. Area/
16、s of the seal/ring that require no visible defects greater than the size or quantity stated in ISO 3601-3 Grade CS. Area/s of the seal/ring that require no visible defects greater than the size or quantity stated in ISO 3601-3 Grade S. SIGNIFICANT (2) Area 2 This area is a functional part of the sea
17、l in that it is directly related to proper functioning of the elastomer part and other associated components such as backup ring(s). As such, the surface should be free of large “void type“ defects that would allow the elastomer to flow from the sealing surface areas (Area 1) during pressurized serv
18、ice, thereby decreasing the effectiveness of the seal assembly. Area/s of the seal/ring that require no visible defects greater than the size or quantity stated in ISO 3601-3 Grade N. MINOR (3) Area 3 This area is not a functional part of the sealing element in that it is not a sealing surface, nor
19、is it under high stress during operation. Area/s of the seal/ring that require no visible defects greater than the size or quantity stated in ISO 3601-3 Grade N, except there are no limitations on the number of allowable imperfections. 4.2 PARTING LINE CRITERIA 4.2.1 Position of parting line(s) vari
20、es by manufacturers and product depending on molding methodologies used. It is the responsibility of the inspecting agency to establish parting line position by product in order to perform appropriate inspections. 4.2.2 Where the parting line is in the sealing area, allowable imperfections shall be
21、per ISO3601-3 Grade S for Type 2 parts and Grade CS for Type 1 parts. 4.2.3 Where the parting line is not in the sealing area, allowable imperfections shall be per ISO3601-3 Grade N. 4.2.4 Imperfections concerning parting line(s) include: a. Flash b. Parting Line Projection c. Parting Line Indentati
22、on d. Mismatch e. Off Register f. Offset g. Backrind h. Excessive Trimming The above does not relieve the requirements at the parting line area for inclusions, non-fills, foreign materials or flow lines per Table 1. SAE INTERNATIONAL AS5752 Page 3 of 13_ 5. LIGHTING AND MAGNIFICATION STANDARDS Imper
23、fections in the above areas, if any, will be within the limits prescribed in Table1 and as noted in 4.2.2 and 4.2.3, when visible under the conditions specified in ISO 3601-3. Imperfections exceeding the limits prescribed in the Table 1, 4.2.2 and 4.2.3 shall be considered defects and cause for reje
24、ction. 6. NOTES 6.1 A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision
25、of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY SAE SUBCOMMITTEE A-6C, POWER GENERATION & DISTRIBUTION OF COMMITTEE A-6, AEROSPACE ACTUATION, CONTROL AND FLUID POWER SYSTEMS S
26、AE INTERNATIONAL AS5752 Page 4 of 13_ REAFFIRMED BY SAE SUBCOMMITTEE A-6C2, SEALS APPENDIX A - SEALING ELEMENT CROSS-SSECTIONAL SHAPES FIGURE A1 - T-SEAL FIGURE A2 - CAPPED T SEAL ELASTOMER ENERGIZER SAE INTERNATIONAL AS5752 Page 5 of 13_ FIGURE A3 - CAMMED TYPE SEAL FIGURE A4 - CAPPED L SEAL ELASTO
27、MER ENERGIZER SAE INTERNATIONAL AS5752 Page 6 of 13_ FIGURE A5 - L SEAL FIGURE A6 - CRUCIFORM SEAL ELASTOMER ENERGIZER SAE INTERNATIONAL AS5752 Page 7 of 13_ FIGURE A7 - PYRAMID SEAL FIGURE A8 - SQUARE RING ELASTOMER ENERGIZER SAE INTERNATIONAL AS5752 Page 8 of 13_ FIGURE A9 - QUADRUPLE LOBED RING F
28、IGURE A10 - SPRING ENERGIZED SEAL WITH PLASTIC INSERT (SPRING AND INSERT MOLDED IN) NOTE: VISUAL INSPECTION IS ON ELASTOMER COMPONENT ONLY SAE INTERNATIONAL AS5752 Page 9 of 13_ FIGURE A11 - SPRING ENERGIZED SEAL WITH PLASTIC INSERT (SPRING AND INSERT MOLDED IN) NOTE: VISUAL INSPECTION IS ON ELASTOM
29、ER COMPONENT ONLY FIGURE A12 - SPRING ENERGIZED SEAL WITH PLASTIC INSERT (SPRING MOLDED IN, SEPARATE INSERT COMPONENT SHOWN FOR CLARITY ONLY) NOTE: VISUAL INSPECTION IS ON ELASTOMER COMPONENT ONLY SAE INTERNATIONAL AS5752 Page 10 of 13_ FIGURE A13 - ENERGIZED SEAL (SEPARATE SPRING SHOWN FOR CLARITY
30、ONLY) NOTE: VISUAL INSPECTION IS ON ELASTOMER COMPONENT ONLY FIGURE A14 - SPRING ENERGIZED SEAL (SEPARATE SPRING SHOWN FOR CLARITY ONLY) NOTE: VISUAL INSPECTION IS ON ELASTOMER COMPONENT ONLY SAE INTERNATIONAL AS5752 Page 11 of 13_ FIGURE A15 - SPRING ENERGIZED SEAL (WITH SPRING MOLDED IN) NOTE: VISUAL INSPECTION IS ON ELASTOMER COMPONENT ONLY FIGURE A16 - U-CUP SHAPED ELASTOMER SEAL SAE INTERNATIONAL AS5752 Page 12 of 13_ FIGURE A17 - METAL GASKET SEAL BONDED TO METAL PLATE NOTE: VISUAL INSPECTION IS ON ELASTOMER COMPONENT ONLY SAE INTERNATIONAL AS5752 Page 13 of 13_
