ISO INTERNATIONAL STANDARD 6336-5 Third edition 2016-08-15 Calculation of load capacity of spur and helical gears - Part 5: Strength and quality of materials Calcul de la capacité de charge des engrenages cylindriques a dentures droite et hélicoidale - Partie 5: Résistance et qualité des matériaux Reference number IS0 6336-5:2016(E) OSI @IS02016 IS0 6336-5:2016(E) COPYRIGHT PROTECTED DOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii @ IS0 2016 - All rights reserved IS0 6336-5:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms, definitions and symbols ..2 4 Methods for the determination of allowable stress numbers .2 4.1 General .2 4.2 Method A. .3 4.3 Method B .3 4.4 Method Br 4.5 Method Bk 3 4.6 Method Bp ...3 5 Standard allowable stress numbers Method B ..3 5.1 Application .3 5.2 Ailowable stress number (contact), oH lim : 4 5.3 Bending stress number values for OF lim and oFE. S 5.3.1 Nominal stress numbers (bending), OF lim 5.3.2 Allowable stress number (bending), OFE 55 5.3.3 Reversed bending. 5.4 Graphs for OH lim and oF lim and oFE. .6 5.5 Calculation of oH lim and oF lim 5.6 Hardening depth of surface hardened gears in finished condition .23 5.6.1 General. 23 5.6.2 Case depth of carburized and hardened gears. 23 5.6.3 Nitriding hardening depth of nitrided gears .25 6 Requirements for material quality and heat treatment .26 6.1 Generalaspects. .26 6.2 Normalized low carbon or cast steel, plain carbon, unalloyed steels (see Figures 1 and 2) .27 6.3 Black malleable cast iron [see Figures 3 a] and 4 a]] 27 6.4 Other materials [see Figures 3 b], 3 c), 4 b), 4 c), 5 to 16] 27 6.5 Coupon 40 6.6 Mechanical cleaning by shot blasting. .41 6.7 Shotpeening 41 6.7.1 General. 41 6.7.2 Strength enhancement .41 6.7.3 Salvage .41 Annex A (informative) Considerations of size of controlling section for through hardened gearing ..43 Annex B (informative) Core hardness coefficients. ..46 Bibliography ..47 @ IS0 2016 - All rights reserved ii