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1、 Please see the administrative notes on page iii RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORT- ING DOCUMENTATION. IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECH
2、NO- LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STAN- DARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS. Reference number ISO/FDIS 4468:2009(E) ISO 2009 FINAL DRAFT ISO/TC 60/SC 1 Secr
3、etariat: BSI Voting begins on: 2009-02-23 Voting terminates on: 2009-04-23 INTERNATIONAL STANDARD ISO/FDIS 4468 Gear hobs Accuracy requirements Fraises-mres Exigences dexactitude Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/11
4、11111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/FDIS 4468:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be ed
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8、untry, neither this ISO draft nor any extract from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying, recording or otherwise, without prior written permission being secured. Requests for permission to reproduce should be addressed
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10、t. Violators may be prosecuted. ii ISO 2009 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -,
11、-,- ISO/FDIS 4468:2009(E) ISO 2009 All rights reserved iii In accordance with the provisions of Council Resolution 15/1993, this document is circulated in the English language only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring
12、/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/FDIS 4468:2009(E) iv ISO 2009 All rights reserved Contents Page Foreword.v 1 Scope1 2 Normative references .1 3 Terms and definitions.2 4 Accuracy requirements 4 5 Derivation
13、 of allowable values.5 5.1 General.5 5.2 Tests 1-7.5 5.3 Tests 9, 11, 11A, 12, 12A.6 5.4 Test 9B .6 5.5 Tests 8, 8A, 9B, 10, 13, 14, 15 and 166 Bibliography .32 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for R
14、esale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/FDIS 4468:2009(E) ISO 2009 All rights reserved v Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The
15、work of preparing International 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-gover
16、nmental, in liaison with ISO, also take 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. Th
17、e main task of technical committees is 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
18、. Attention is drawn to the possibility 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 4468 was prepared by Technical Committee ISO/TC 60, Gears, Subcommittee SC 1, Nomenclature and
19、wormgearing. This second edition cancels and replaces the first edition (ISO 4468:1982), which has been technically revised. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo rep
20、roduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -
21、,-,- FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 4468:2009(E) ISO 2009 All rights reserved 1 Gear hobs Accuracy requirements 1 Scope This International Standard specifies requirements for the accuracy of general-purpose hobs of 0,5 module to 40 module. These hobs are intended for producing gears whi
22、ch conform to ISO 53 and ISO 54. This International Standard applies to hobs for spur and helical gears. It applies to solid (monobloc) and inserted blade hobs. The elemental features of hobs are graded according to accuracy, as follows: Grade 4A; Grade 3A; Grade 2A: Grade A; Grade B; Grade C; Grade
23、 D. Grade 4A is the highest order of precision. In addition to the elemental tests for hobs, this International Standard gives permitted tolerances for composite tests that are taken along the cutting edges on the line of action. The two groups of tests are not equivalent and one shall choose betwee
24、n one or the other. If there was no previous agreement, the hob is regarded as belonging to the precision class specified if it satisfies one or the other of the two methods of inspection. NOTE The tolerances in this International Standard were determined for gear hobs whose dimensions conform to IS
25、O 2490, but with certain precautions they can be applied to hobs not specified in this International Standard. 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 reference
26、s, the latest edition of the referenced document (including any amendments) applies. ISO 53, Cylindrical gears for general and heavy engineering Standard basic rack tooth profile ISO 54, Cylindrical gears for general engineering and for heavy engineering Modules Copyright International Organization
27、for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/FDIS 4468:2009(E) 2 ISO 2009 All rights reserved ISO 286-2, ISO system of limits and fits Par
28、t 2: Tables of standard tolerance grades and limit deviations for holes and shafts ISO 1122-1, Vocabulary of gear terms Part 1: Definitions related to geometry ISO 2490, Solid (monobloc) gear hobs with tenon drive or axial keyway, 0,5 to 40 module Nominal dimensions 3 Terms and definitions For the p
29、urposes of this document, the terms and definitions given in ISO 1122-1 and the following apply. 3.1 radial runout of hub diameter total deviation in radial distance of the hub periphery from the axis 3.2 axial runout of hub face total axial deviation of the hub face from a true plane of rotation 3.
30、3 radial runout of tips of teeth total deviation in the radial distance from the axis to the tips of the hob teeth 3.4 straightness and radial alignment over cutting depth angular relationship between the tooth face and a radial line intersecting the tooth face at the hob outside diameter, measured
31、in a plane perpendicular to the axis 3.5 adjacent spacing of cutting face of gashes maximum deviation between any two consecutive cutting face measurements 3.6 total spacing of cutting face of gashes maximum deviation between any two cutting face measurements 3.7 gash lead deviation per 100 mm maxim
32、um deviation as the probe contacts the tooth faces within axial region of the gash NOTE Allowable values for deviations are given per 100 mm of cutting face width. 3.8 tooth profile deviation maximum deviation of that portion of the hob tooth that generates an unmodified involute profile 3.8.1 tooth
33、 profile deviation when line of action test is used maximum deviation of that portion of the hob tooth that generates an unmodified involute profile when the line of action test is used NOTE Test 8A is used for tooth profile deviation when the line of action test is used. Copyright International Org
34、anization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/FDIS 4468:2009(E) ISO 2009 All rights reserved 3 3.9 tooth thickness normal tooth t
35、hickness difference of actual and reference datum at the reference cylinder NOTE Negative only. 3.9.1 addendum difference of addendum values related to designed normal tooth thickness observed during testing NOTE Positive only. Test 9A is used for addendum. 3.9.2 tooth thickness difference along one
36、 gash difference between maximum and minimum nominal tooth thickness along one gash at the reference cylinder NOTE Test 9B is used for tooth thickness difference along one gash. This test is only valid for quality Grades 4A, 3A and 2A. 3.10 lead deviation on adjacent teeth maximum lead deviation bet
37、ween any two consecutive teeth 3.11 lead deviation in one axial pitch maximum deviation between any two teeth within any group of consecutive teeth contained in one axial pitch; the number of teeth in one axial pitch is the number of teeth encountered by the measurement probe as it moves parallel to
38、 the reference axis during lead testing for a distance of one axial pitch of the hob NOTE The number of teeth is determined by the number of gashes, the number of threads and, in the case of helical gash hobs, the gash lead. 3.11.1 lead deviation in one axial pitch when line of action test is used m
39、aximum deviation between any two teeth within any group of consecutive teeth contained in one axial pitch when the line of action test is used NOTE Test 11A is used for lead deviation in one axial pitch when the line of action test is used. 3.12 lead deviation in three axial pitches maximum lead dev
40、iation between any two teeth contained in three axial pitches; the number of teeth in three axial pitches is that number of teeth encountered by the measurement probe as it moves parallel to the reference axis during lead testing for a distance of three axial pitches of the hob NOTE The number of te
41、eth is determined by the number of gashes, the number of threads and, in the case of helical gash hobs, the gash lead. 3.12.1 lead deviation in three axial pitches when line of action test is used maximum lead deviation between any two teeth contained in three axial pitches when the line of action t
42、est is used NOTE Test 12A is used for lead deviation in three axial pitches when the line of action test is used. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 04/09/2009 03:43:01 MDTNo reproduction o
43、r networking permitted without license from IHS -,-,- ISO/FDIS 4468:2009(E) 4 ISO 2009 All rights reserved 3.13 adjacent deviation along line of action maximum deviation between any two consecutive teeth of a given line of action test NOTE 1 Adjacent hob line of action allowable deviation can be app
44、lied to adjacent line of action test results in those cases where the hob has been specified to be manufactured with involute helicoid geometry. NOTE 2 Adjacent deviation along the line of action is measured at the cutting edge. 3.14 total deviation along line of action total maximum deviation betwe
45、en any two teeth of a given line of action test NOTE 1 Total hob line of action allowable deviation can be applied to total line of action test results in those cases where the hob has been specified to be manufactured with involute helicoid geometry. NOTE 2 Total deviation along the line of action
46、is measured at the cutting edge. 3.15 axial pitch deviation from thread to thread maximum axial pitch deviation between any two consecutive teeth contained within two gashes NOTE 1 For an odd number of threads, the angle between the gashes is approximately 90. For an even number of threads, it is ap
47、proximately 120. NOTE 2 The minimum requirement is to inspect the number of axial pitches equal to the number of threads. 3.16 axial pitch deviation in any three axial pitches over all threads maximum axial pitch deviation over any three adjacent teeth contained within two gashes NOTE 1 For an odd n
48、umber of threads, the angle between the gashes is approximately 90. For an even number of threads, it is approximately 120. NOTE 2 The minimum requirement is to inspect the number of axial pitches equal to the number of threads. 4 Accuracy requirements Hobs shall conform to the requirements of Tables 2 and 4, as appropriate. When prior agreement between the hob manufacturer and purchaser specifies measurement of ho