1、 STD-AECMA PREN 3077-ENGL 1998 m 1012311 0014858 9bb m Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to C4 Chairman prEN 3077 Edition P 1 September 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE
2、 INDUSTRIES (AECMA) Guiledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: Descriptors: Srie arospatiale Colliers vis tangente Spcification technique ENGLISH VERSION Aerospace series Clamps worm drive Technical specification Luft- und Raumfahrt Schellen mit Schnecken
3、trieb Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concern
4、ed Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination a
5、nd signature of the AECMA Standard Checking Centre INPSI and format agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. 1998-09-30 AECMA Gulledelle 94 B-1200 BRUXELLES Mr Staib a
6、ecma 1998 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STDOAECMA PREN 3077-ENGL 1998 LO12311 0034859 8T2 Page 3 prEN 3077 1 Scope This standard spec
7、ifies the required characteristics, inspections, test methods, quality assurance, qualification, acceptance and delivery conditions of clamps worm drive designed for use with suitable rubber hoses to form joints in fluid system pipelines. The clamps worm drive are intended to be used as specified in
8、 the product standards. 2 Normative references This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendmen
9、ts to or revisions of any of these publications apply to this standard only when incoporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 2859-1 Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed
10、 by acceptable quality level (AQL) for lot-by-lot inspection EN 2000 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers EN 3042 Aerospace series - Quality assurance - EN aerospace products - Qualification procedure EN 10204 Metallic product
11、s - Types of inspection documents Previous page is blank HZLZ (Y/G.FNPI/M/F/D) Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD=AECMA PREN 3077-ENGL
12、 1998 m 10123Ll 00148b0 514 Page 4 prEN 3077 3 Definitions 4 For the purposes of this standard, the following definitions apply: Clause Characteristic 3.1 Clamp worm drive: is a band of material fitted with an adjustment device intended for use in conjunction with a suitable hose to provide a pipe-t
13、o-pipe joint. Requirement 3.2 Batch: It shall consist of clamps of a particular size and material produced under essentially the same manufacturing conditions and presented for inspection at the same time. Inspection and test method The acceptance test cerrifi- cate for the semi-finished product may
14、 be used. They shall be measured using suitable instruments Visual examination Visual examination The maximum and minimum values of the tightening range shall be checked by dimen- sional inspection. The maxi- mum value shall be checked by mounting the clamp on a mandrel and the band screw engaged wh
15、ile the clamp is opened and the closing pro- cess initiated. The clamps shall be mounted on a mandrel of nominal dia- meter and tightened to the torque values specified. There shall be no deformation of screw threads or band slots. The test shall be re- peated on mandrels of maxi- mum and minimum di
16、ameter. The clamps may be lubricated or dry. 4 Requirements, inspection and test methods See table 1. Q A ) 1 xx x x xx xx x x x Table 1 4.1 4.2 4.3 Materials Dimensions and tolerances Marking 4.5 They shall conform with the requirements of the product standards. Tightening range They shall conform
17、with the values quoted in the product standards. The clamps shall be marked to the requirements of the product standards. It shall be legible and shall not degrade the material or adversely affect the Dart. Te appearance The clamps shall be free from burrs, sharp edges, irregular surfaces on the cla
18、mp band and any other defect which could affect their service use. The clamps shall be designed to operate within the full tightening range specified in the product standards. When the clamp is fully opened it shall be possible to reengage the band screw easily so that it passes into the closing ran
19、ge without any noticeable resistance. The clamps shall be capable of being tightened to the values specified in the pro- duct standards. They shall apply over the full tightening range. (continued) H2U (YIG.FIVNIMIFID1) Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provid
20、ed by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table 1 (concluded) Requirement The clamps shall be capable of withstanding a torque of 1.5 times the value specified in the product standards. Repeated assembly shall not cause any c
21、hange in clamp dimensions or affect the cor- rect functioning. The clamps shall be mounted on a mandrel of nominal dia- meter. The clamps shall then be tightened until failure oc- curs. The torque recorded shall be in excess of the values sDecified. To verify repeated assembly the clamps shall be in
22、stalled five times on a maximum dia- meter mandrel. The clamps shall be opened by detaching the band from the screw and passing over the mandrel. On completion of the test the dimensions of the clamps shall be checked using suit- able instruments and inspected for defects likely to affect Derformanc
23、e. 1 Q : Qualification A : Acceptance Inspection and test method Page 5 prEN 3077 5 Quality assurance 5.1 Approval of manufacturer See EN 2000. 5.2 Product qualification See EN 3042. To obtain qualification for clamps the manufacturer shall observe the schedule and the requirements of table 2. No ch
24、ange in material or design is permitted without the prior approval of the qualification authorities who granted the initial approval. 6 Acceptance conditions 6.1 Manufacturers responsibii The manufacturer is responsible for the tests to be performed at product acceptance. 6.2 Inspections and tests T
25、he inspections and tests to be performed by the manufacturer for the acceptance of a batch of clamps shall be those listed in table 3. A random sample shall be selected from each batch in accordance with the procedures listed in IS0 2859-1. The inspection level and acceptance quality level AQL shall
26、 be as specified in table 3. H2LZ (Yt6.FNNIMIFID) Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN 3077-ENGL 1998 = 1012311 0034862 397 I
27、nspection or test Defined in Materials 4.1 Dimensions and tolerances 4.2 Marking 4.3 Surface appearance 4.4 Tightening range 4.5 Reusability 4.8 Band width and thickness All other dimensions Page 6 prEN 3077 IS0 2859-1 Inspection level 1 AQL At manufacturers option 1 ,O (major) 4.0 (minor) 4,O (mino
28、r) 4.0 (minor) 4,O (minor) 5 parts Table 2: Inspection and tests for qualification Table 3: Inspection and tests for acceptance 7 Packaging The clamps shall be packed so as not to be damaged during transit; individual packaging is preferred. They shall be protected against humidity, corrosion, dirt
29、and any other harmful attacks. The packaging material in contact with the clamps shall provide this protection. The following shall appear on each individual package: - name of manufacturer - quantity - identity block of the product standard - date of packaging - name of manufacturer - number of ord
30、er or contract - quantity - description - identity block of the product standard - reference of manufacturer At least the following shall appear on collective packages for transport: 8 Certificate of conformity -. All deliveries of clamps referring to this standard shall be accompanied by an acceptance test certificate in accordance with EN 10204, type 2.1 . H2U (Y/G.FNNIMIF/DI) Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
