AGMA 1102-B13-2013 Tolerance Specification for Gear Hobs.pdf

1、ANSI/AGMA1102-B13 ANSI/AGMA 1102-B13 (Revision of ANSI/AGMA 1102-A03) American National Standard Tolerance Specification for Gear Hobs AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved ii Tolerance Specification for Gear Hobs ANSI/AGMA 1102-B13 (Revision of ANSI/AGMA 1102-A

2、03) Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agr

3、eement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of

4、American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing or using products, processes or procedures not conforming to the standards. The American National Stan

5、dards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute

6、. Requests for interpretation of this standard should be addressed to the American Gear Manufacturers Association. CAUTION NOTICE: AGMA technical publications are subject to constant improvement, revision or withdrawal as dictated by experience. Any person who refers to any AGMA Technical Publicatio

7、n should be sure that the publication is the latest available from the Association on the subject matter. Tables or other self-supporting sections may be referenced. Citations should read: See ANSI/AGMA 1102-B13, Tolerance Specification for Gear Hobs, published by the American Gear Manufacturers Ass

8、ociation, 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia 22314, http:/www.agma.org. Approved April 8, 2013 ABSTRACT The purpose of this standard is to provide specifications for nomenclature, dimensions, tolerances, and inspection of gear hobs, and thereby establish a basis for mutual under

9、standing in this respect in the use and manufacture of these tools. Published by American Gear Manufacturers Association 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia 22314 Copyright 2013 by American Gear Manufacturers Association All rights reserved. No part of this publication may be rep

10、roduced in any form, in an electronic retrieval system or otherwise, without prior written permission of the publisher. Printed in the United States of America ISBN: 978-1-61481-086-5 American National Standard AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved iii Contents

11、Foreword vi 1 Scope . 1 1.1 Application . 1 1.2 Exceptions . 1 2 Normative references . 1 3 Terminology and definitions . 1 4 Hob classifications, drawings, and identification markings 8 4.1 Coverage . 8 4.2 Drawings . 8 4.2.1 Normal section 8 4.2.2 Standard format. 9 4.2.3 Minimum hob data . 9 4.3

12、Identification 10 4.3.1 Hob markings 10 4.3.2 Additional hob markings 10 5 Manufacturing and purchasing considerations 11 5.1 Manufacturing certification 11 5.2 Process control 11 5.3 Measurement methods . 12 5.3.1 Considerations for hob measurements . 12 5.4 Additional considerations 14 5.4.1 Modif

13、ied AGMA accuracy grade . 14 5.4.2 Hob geometry system . 14 5.4.3 Acceptance criteria 15 5.4.4 Evaluation of hob accuracy . 15 6 Gear hobs single and multiple start accuracy requirements . 15 6.1 Derivation of tolerances 15 6.1.1 Rounding rules 17 6.1.2 Grade ratios . 18 6.1.3 Module range ratios 18

14、 6.1.4 Test ratios 18 6.2 Multiple thread ratios . 18 6.3 Multiple thread factors . 18 7 Measuring methods and practices . 18 7.1 Inspection practices 18 7.1.1 Inspection plans 18 7.1.2 Inspection data references 18 7.1.3 Reference inspection zone 18 7.2 Bore diameter 19 7.2.1 Bore diameter testing

15、19 7.2.2 Bore diameter tolerances Test No. 17 19 7.3 Hub 19 7.3.1 Hub runout testing . 19 7.3.2 Hub runout tolerances . 19 7.3.3 Hub face perpendicularity testing 19 AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved iv 7.4 Outside diameter runout 19 7.4.1 Outside diameter r

16、unout testing 19 7.4.2 Outside diameter runout tolerances Test No. 3 19 7.5 Tooth face index 19 7.5.1 Tooth face index testing 19 7.5.2 Tooth face index tolerances 20 7.6 Flute lead . 20 7.6.1 Flute lead testing . 20 7.6.2 Flute lead tolerance Test No. 7 . 20 7.7 Rake offset to cutting depth 20 7.7.

17、1 Rake offset testing 20 7.7.2 Rake offset tolerance Test No. 4. 20 7.8 Thread lead . 20 7.8.1 Thread lead testing . 21 7.8.2 Thread lead tolerances . 21 7.9 Thread spacing 21 7.9.1 Thread spacing testing 21 7.9.2 Thread spacing tolerance 22 7.10 Tooth profile 22 7.10.1 Tooth profile testing . 22 7.

18、10.2 Tooth profile tolerances Test Nos 8 and 8A . 23 7.11 Tooth thickness . 23 7.11.1 Tooth thickness testing . 23 7.11.2 Tooth thickness tolerance Test No. 9 . 23 7.12 Line of action . 23 7.12.1 Line of action testing . 24 7.12.2 Line of action tolerances . 25 Annexes Annex A (informative) Gear man

19、ufacturing terminology . 40 Annex B (informative) Hob design parameters . 42 Annex C (informative) Equations and terminology for straight-sided hob profiles 44 Annex D (informative) Effects of hob accuracy on gear accuracy 52 Tables Table 1 - Hob markings . 10 Table 2 - Reference for measurement met

20、hods . 12 Table 3 - Grade ratio, Kg. 15 Table 4 - Module range ratio, Km. 16 Table 5 - Test ratios, Ke17 Table 6 - Ratio for number of threads, Kt17 Table 7 - Multiple thread factor, Kmt17 Table 8 - Accuracy requirements1)26 Figures Figure 1 - Hob nomenclature 2 Figure 2 - Evaluation zone 2 Figure 3

21、 - Cam 2 Figure 4 - Engagement zone, generating portion . 3 Figure 5 - Protuberance on a gear hob tooth 6 AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved v Figure 6 - Negative rake 6 Figure 7 - Positive rake . 6 Figure 8 - Zero rake 7 Figure 9 - Tip radii . 8 Figure 10 -

22、Tip relief on a gear tooth . 8 Figure 11 - Normal section 9 AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved vi Foreword The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI

23、/AGMA Standard 1102-B13, Tolerance Specification for Gear Hobs. ANSI/AGMA 1102-A03 is a replacement of AGMA 120.01. The first draft of AGMA 120.01 was prepared by the Cutting Tools Committee in May, 1972. Its purpose was to consolidate all AGMA standards relating to hobs; i.e., AGMA 121.02, 122.02,

24、123.01 and 124.01. The purpose of consolidating these standards was to provide the information as a handy updated reference on gear-cutting tools for efficient use by manufacturers and users of these tools. The committee decided at the 1972 Semi-Annual Meeting to include Standard 124.01, Wormgear Ho

25、bs, as an Information Sheet. AGMA 120.01 was approved by the Cutting Tools Committee on November 6, 1973. It was approved by the AGMA Membership as of February 28, 1975. ANSI/AGMA 1102-A03 is the result of a rewrite of AGMA 120.01, incorporation of the metric system, addition of inspection procedure

26、s, and development of equation based tolerances. Other additions include increased tolerance grade levels, expansion of tolerances for multi-thread hobs, line of action testing, and expansion of the hob range of sizes. ANSI/AGMA 1102-A03 was approved by the AGMA Membership on December 3, 2003. ANSI/

27、AGMA 1102-B13 is a revision of ANSI/AGMA 1102-A03. The equations found in clause 6 were updated and reformatted for clarity. In addition, tables were added to clause 6 to assist in the use of these equations. The values in Table 8 were reviewed and updated accordingly. ANSI/AGMA 1102-A03, Annex D wa

28、s removed. The first draft of ANSI/AGMA 1102-B13 was made in March, 2007. It was approved by the AGMA membership in April 25, 2013. It was approved as an American National Standard on April 8, 2013. Suggestions for improvement of this standard will be welcome. They may be submitted to techagma.org.

29、AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved vii PERSONNEL of the AGMA Cutting Tools Committee Chairman: Michael Tennutti Gleason Cutting Tools Corporation Vice Chairman: John Brunner . Rexnord Gear Group ACTIVE MEMBERS D. Hoying Gleason Metrology Systems Corporation J

30、. ONeil Star Cutter Company G. Schlarb Gleason Cutting Tools Corporation A. Wilkerson . Allison Transmission, Inc. AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved 1 AMERICAN GEAR MANUFACTURERS ASSOCIATION ANSI/AGMA 1102-B13 American National Standard - Tolerance Specifica

31、tion for Gear Hobs 1 Scope This standard provides specifications for nomenclature, dimensions, tolerances, and inspection for gear hobs for modules 0.63 to 40 mm. It establishes a basis for understanding the use and manufacture of these tools. 1.1 Application This standard applies to single and mult

32、iple-thread hobs for spur and helical gears. 1.2 Exceptions This standard is not intended to completely define the hob tooth profile as it relates to the exact gear profile. It is advisable to check gear tooth profile specifications with the hob manufacturer involved. Examples include cutting depth

33、and hob tooth profile modification as they affect gear tooth tip relief for fine-pitch and coarse-pitch hobs. Where conditions require use of hobs of special design or specifications, such hobs shall be considered beyond the scope of this standard. 2 Normative references The following standards cont

34、ain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to i

35、nvestigate the possibility of applying the most recent editions of the standards indicated below. ANSI/AGMA 1012-G05, Gear Nomenclature, Definitions of Terms with Symbols AGMA 915-3-A99, Inspection Practices - Gear Blanks, Shaft Center Distance and Parallelism MIL-STD-105E, Sampling Procedures and T

36、ables for Inspection by Attributes 3 Terminology and definitions The terms and definitions used in this standard are, wherever possible, consistent with ANSI/AGMA 1012-G05 and other approved AGMA documents. However, some symbols and definitions used in this standard may differ from other AGMA Standa

37、rds. Users should assure themselves that they fully understand the terms, definitions, and symbols as contained in this standard. Nomenclature used in this standard and the hob elements referred to are illustrated in Figure 1 through Figure 10. Nomenclature of hob elements and other terms relating t

38、o hobbing are presented as follows: active hob length: axial length of the toothed portion of the hob. See Figure 2. allowable deviation: maximum deviation a hob can have without exceeding the tolerance. auxiliary leads: feature employed in some hobs, especially worm gear hobs, wherein both sides of

39、 the hob thread have leads different from the nominal hob lead; one side longer, the other side shorter. This results in the tooth thickness being successively less toward the roughing end of the hob. axial plane: plane containing the axis of rotation. AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 A

40、GMA 2013 All rights reserved 2 Figure 1 - Hob nomenclature Figure 2 - Evaluation zone axial pressure angle: see definition under pressure angle. back-off: see preferred term cam relief, under relief. bore diameter: diameter of the mounting hole for arbor type hobs. cam: radial drop of the form in th

41、e angular distance between adjacent tooth faces. See Figure 3. Figure 3 - Cam AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved 3 cam relief: see definition under relief. chamfer: beveled surface to eliminate an otherwise sharp corner. clutch keyway: see face keyway. depth

42、of cut: radial depth to which the hob is engaged with the workpiece. See related term whole depth. deviation: differences observed during testing that are compared against the specified value or tolerance. engagement zone, generating portion: axial distance within which the hob interacts with the in

43、volute portion of a gear tooth profile being generated. It is equal to the axial component of the hob line of action within the confines of the functional profile. See Figure 4. evaluation zone: the axial distance which starts with the entry side of first full tooth and ends with the exit side of th

44、e last full tooth in relation to the lead pattern of the hob. See Figure 2. face keyway: transverse slot across the hub face. fillet: 1) curved line joining two lines to eliminate a sharp internal corner; 2) curved surface joining two surfaces to eliminate a sharp internal corner. flute: longitudina

45、l groove, either straight or helical, that forms the tooth face of one row of hob teeth and the backs of the preceding row. flute helix angle: angle which a helical tooth face makes with an axial plane, measured on the hob pitch cylinder. flute index: see tooth face index. flute lead: axial advance

46、of a flute face in one turn around the axis of a hob. flute lead deviation: deviation of a hob tooth face from the desired helical surface. full tooth: any tooth within the active hob length that has a complete profile down to the whole depth. functional profile: portion of hob tooth that generates

47、the involute profile of a gear tooth. It is limited toward the tip by the start of tip radius or when present, start of protuberance modification. It is limited toward the root by the hob tooth dedendum or when present, start of tip relief or chamfer modification. See Figure 4. functional profile de

48、pth: depth of the functional profile. gash: see preferred term flute. generated fillet: at the bottom of the hobbed form, fillet joining the root diameter with the desired generated form. This fillet is not a true radius, it is a trochoid form. generated fillet height: on the hobbed workpiece, radia

49、l distance from the root diameter to the point where the generated fillet joins the desired generated form. Figure 4 - Engagement zone, generating portion AMERICAN NATIONAL STANDARD ANSI/AGMA 1102-B13 AGMA 2013 All rights reserved 4 helicoid, Archimedes: plane surface of compound curvature, defined by its intersections with the following planes: - intersection with a transverse plane is an Archimedes spiral; - intersection with a concentric cylinder is a helix; - intersection with an axial plane is a straight line. helicoid, involute: pl