1、BSI Standards PublicationShipbuilding Ship screw propellers Manufacturing tolerancesPart 2: Propellers of diameter between 0,80 and 2,50 m inclusiveBS ISO 484-2:2015National forewordThis British Standard is the UK implementation of ISO 484-2:2015.The UK participation in its preparation was entrusted
2、 to TechnicalCommittee SME/32, Ships and marine technology - Steering committee.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its corre
3、ct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 89504 3ICS 47.020.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy
4、 Committee on 31 December 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 484-2:2015 ISO 2015Shipbuilding Ship screw propellers Manufacturing tolerances Part 2: Propellers of diameter between 0,80 and 2,50 m inclusiveConstruction navale Hlices de navires T
5、olrances de fabrication Partie 2: Hlices de diamtre compris entre 0,80 et 2,50 m inclusINTERNATIONAL STANDARDISO484-2Second edition2015-12-01Reference numberISO 484-2:2015(E)BS ISO 484-2:2015ISO 484-2:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerla
6、ndAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be request
7、ed from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 484-2:2015ISO 484-2:2015(E)Foreword ivIntroduction
8、v1 Scope . 12 Normative references 13 Field of application 14 Methods of measuring pitch . 14.1.1 Use of marking gauges 14.1.2 Method with a graduated ring 14.1.3 Method using coordinate measuring machine. 25 Methods of measuring the thickness of the section . 26 Accuracy classes 37 Tolerances on th
9、e pitch 48 Tolerances on the extreme radius of the screw propeller. 59 Tolerances on the thickness of the blade section . 510 Checking and tolerances of the form of blade sections 611 Tolerances of the length of the blade sections. 812 Tolerances on the location of blades, reference lines, and blade
10、 contours . 812.1 Marking of lines of reference 812.2 Tolerances on the contour of the leading edge . 912.3 Tolerances on the angular deviation between two consecutive blades 1013 Tolerances on rake, axial position, and relative axial position of consecutive blades1014 Surface finish .1115 Static ba
11、lancing .1116 Measuring equipment 12Bibliography .13 ISO 2015 All rights reserved iiiContents PageBS ISO 484-2:2015ISO 484-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Inter
12、national Standards 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 wit
13、h ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives,
14、 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 t
15、he 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 on the ISO list of patent declarations
16、received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs
17、 adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee SC 3, Piping and machinery.This second edition cancels and replaces
18、the first edition (ISO 484-2:1981), which has been technically revised.ISO 484 consists of the following parts, under the general title Shipbuilding Ship screw propellers Manufacturing tolerances: Part 1: Propellers of diameter greater than 2,50 m Part 2: Propellers of diameter between 0,80 m and 2,
19、50 m inclusiveiv ISO 2015 All rights reservedBS ISO 484-2:2015ISO 484-2:2015(E)IntroductionThe propeller manufacturer is at liberty to use any equipment and method that enables the tolerances to be verified to the required accuracy. ISO 2015 All rights reserved vBS ISO 484-2:2015Shipbuilding Ship sc
20、rew propellers Manufacturing tolerances Part 2: Propellers of diameter between 0,80 and 2,50 m inclusive1 ScopeThis part of ISO 484 defines manufacturing tolerances of ship screw propellers of a diameter between 0,80 m and 2,50 m.NOTE Some deviations for the tolerance are permitted in certain cases
21、subject to the discretion of the customer or of the designer and the customer.2 Normative referencesThe 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 r
22、eferences, the latest edition of the referenced document (including any amendments) applies.ISO 1302, Geometrical Product Specifications (GPS) Indication of surface texture in technical product documentationISO 1940-1:2003, Mechanical vibration Balance quality requirements for rotors in a constant (
23、rigid) state Part 1: Specification and verification of balance tolerances3 Field of applicationThis part of ISO 484 applies to monobloc, built-up, and controllable pitch propellers.4 Methods of measuring pitch4.1 The principle of one method of measurement consists in setting out along a helicoidal l
24、ine of radius, r, a certain length, PQ, corresponding to the desired angle, , and in measuring the difference, h, in the heights of the points P and Q with respect to a reference plane (see Figure 1).The length PQ shall be set out using one of the methods described in 4.1.1, 4.1.2 or 4.1.3.NOTE Othe
25、r methods giving the required accuracy may be used if necessary.4.1.1 Use of marking gaugesThe length PQ shall be set out by means of marking gauges.4.1.2 Method with a graduated ringThe length PQ shall be set out by means of angle, , on a part of a graduated ring of suitable radius (see Figure 1).I
26、NTERNATIONAL STANDARD ISO 484-2:2015(E) ISO 2015 All rights reserved 1BS ISO 484-2:2015ISO 484-2:2015(E)4.1.3 Method using coordinate measuring machineThe height coordinates are taken at defined measuring points by means of coordinate measuring machine and they are related to each other (determinati
27、on of height differences needed for pitch evaluation). Both cartesian coordinate system (x, y, z) and polar coordinate system (, r, h) can be applied alternatively in order to define measuring points P and Q.5 Methods of measuring the thickness of the section5.1 The thickness of a cylindrical sectio
28、n at a point S shall be measured along direction SV (see Figure 2) on the plane tangent to the coaxial cylinder and perpendicular to the pitch line of the pressure side of the section (and only along direction SU perpendicular to the pressure side surface or direction S parallel to the propeller axi
29、s when defined in this way on the drawings).APBQhr21Key1 small graduated ring2 large graduated ringFigure 1 Pitch measurement2 ISO 2015 All rights reservedBS ISO 484-2:2015ISO 484-2:2015(E)SSSSSS12345TVUTVSU1234567Key1 pressure side2 suction side3 cylindrical section4 line of maximum thickness of se
30、ction perpendicular to the pressure side5 developed section perpendicular to the pressure side6 developed cylindrical section7 pressure sideFigure 2 Thickness measurement5.2 The maximum thickness at each radius shall be determined by means of a pair of outside callipers or from the profile obtained
31、by plotting the thickness at various points: S, S1, S2, S3, etc.6 Accuracy classesThe accuracy class shall be selected by the customer. The indications in Table 1 serve as guidance in this choice.Table 1 Accuracy of manufacturingClass Manufacturing accuracyS Very high accuracyI High accuracyII Mediu
32、m accuracyIII Wide tolerances ISO 2015 All rights reserved 3BS ISO 484-2:2015ISO 484-2:2015(E)7 Tolerances on the pitchTable 2 Pitch tolerancesDesignation of pitchClassS I II IIIa) Local pitch 1,5 % 2 % 3 %with a minimum of 10 mm 15 mm 20 mmb) Mean pitch per radius of each blade1 % 1,5 % 2 % 5 %with
33、 a minimum of 7, 5 mm 10 mm 15 mm 25 mmc) Mean pitch per blade 0,75 % 1 % 1,5 % 4 %with a minimum of 5 mm 7, 5 mm 10 mm 20 mmd) Mean pitch for propeller 0,5 % 0,75 % 1 % 3 %with a minimum of 4 mm 5 mm 7, 5 mm 15 mmNOTE The tolerances of Table 2 are expressed as percentages of the design pitch corres
34、ponding to the radius for designations a) and b) and the mean design pitch for designations c) and d).7.1 Pitch shall be measured at least at the radii indicated in Table 3. By agreement between the interested parties, different radii may be measured.Table 3 Pitch measurement locationsClass RadiiS a
35、nd I A section near the hub 0,4 R 0,5 R 0,6 R 0,7 R 0,8 R 0,9 R 0,95 RII and III A section near the hub 0,5 R 0,7 R 0,9 R7.2 The measurement of local pitches for Class S and Class I is further controlled as described in Clause 10.7.3 The tolerances on the local pitch and on the mean pitch of each ra
36、dius of each blade given in Table 2, a) and b) are increased by 50 % for sections at 0,4 R or less.7.4 Should the propeller manufacturer wish to compensate for an error on the pitch (inside or outside the tabulated tolerances) by means of an alteration in the propeller diameter, he may do so only wi
37、th the customers agreement.7.5 The design pitch is the pitch of the reference line as defined below.The design pitch line of a section is a helical reference line for the section in question of which the section ordinates for the face and the back are given.It could be a line joining the nose and ta
38、il of the section or any other conveniently placed helical line.7.6 The local pitch at a point B (Figure 1) is determined by measuring the difference in height between two points, P and Q, situated at equal distances from point B and on either side of the latter (BP = BQ) and by multiplying the diff
39、erence in height by 360. This shall be compared with the local pitch as calculated from the face offsets for the same points.There shall be four pitch measurements for Class S, three for Class I, and two for Class II. These measurements shall be consecutive (the initial point of each measurement coi
40、nciding with the final 4 ISO 2015 All rights reservedBS ISO 484-2:2015ISO 484-2:2015(E)point of the adjacent measurement). Each measurement span shall be sufficiently long to maintain adequate accuracy in the pitch measurement in compliance with Clause 16. Where necessary, the number of measurements
41、 may be reduced in order to comply with the latter requirement.7.7 The pitch per radius and per blade is determined for each radius by multiplying the difference in height between the most distant measuring points at each radius by360.7.8 The average pitch per blade is defined as the arithmetic mean
42、 (average) of the measured pitches per radius for the blade in question.7.9 The average pitch for the screw propeller is defined as the arithmetic mean of the average pitches per blade.8 Tolerances on the extreme radius of the screw propeller8.1 The tolerances in Table 4 are expressed as percentages
43、 of screw propeller radius and as minimum absolute values.Table 4 Radius toleranceSpecificationClassS I II IIITolerance 0,2 % 0,3 % 0,4 % 0,5 %but not less than 1,5 mm 1,5 mm 2 mm 2,5 mm8.2 In the case of a ducted propeller, these tolerances may need to be reduced.9 Tolerances on the thickness of th
44、e blade sectionTable 5 Blade thickness toleranceSpecificationClassS I II IIIPlus tolerances +2 % +2,5 % +4 % +6 %but not less than 2 mm 2,5 mm 4 mm 6 mmMinus tolerances 1 % 1,5 % 2 % 4 %but not less than 1 mm 1,5 mm 2 mm 4 mm9.1 The thickness shall be measured at the same radii as those at which the
45、 pitch is measured.9.2 The tolerances in Table 5 are expressed as percentages of the local thickness and as minimum absolute values.9.3 The maximum thicknesses indicated on the drawing shall not be less, after deduction of the minus tolerance, than the thicknesses required be the Classification Soci
46、ety concerned. ISO 2015 All rights reserved 5BS ISO 484-2:2015ISO 484-2:2015(E)10 Checking and tolerances of the form of blade sections10.1 These apply only to propellers of Class S and Class I and to the same radii as those at which the pitch is measured.In case of CNC-machining of blade and edges,
47、 it can be agreed between the manufacturer and the user to abstain from any further checking of the form of blade sections.10.2 To avoid undue deviation in overall camber, the algebraic sum of the percentage deviations resulting from any two consecutive measurements of local pitch shall not be in ex
48、cess of 1,5 times the allowable tolerance (for example, if the tolerance is 2 %; the sum of consecutive deviations shall be within 3 %, see Figure 3).10.3 Alternatively, the satisfactory continuity of the cylindrical sections may be verified by the use of suitable flexible templates.The leading and
49、trailing edges shall be checked by templates, or equivalent devices, to demonstrate their accuracy to the drawing to within the following tolerances of the face and the back: Class S: 0,5 mm; Class I: 0,75 mm.Alternatively, by agreement between the manufacturer and the user, the edges shall be checked by templates made in three parts for each edge (see Figure 4) a short nose template controlling the final edge detail and t
