ISO 6336-5:2016
Calculation of load capacity of spur and helical gears — Part 5: Strength and quality of materials
ISO 6336-5:2016 describes contact and tooth-root stresses and gives numerical values for both limit stress numbers. It specifies requirements for material quality and heat treatment and comments on their influences on both limit stress numbers.
Values in accordance with ISO 6336-5:2016 are suitable for use with the calculation procedures provided in ISO 6336‑2, ISO 6336‑3 and ISO 6336‑6 and in the application standards for industrial, high-speed and marine gears. They are applicable to the calculation procedures given in ISO 10300 for rating the load capacity of bevel gears. ISO 6336-5:2016 is applicable to all gearing, basic rack profiles, profile dimensions, design, etc., covered by those standards. The results are in good agreement with other methods for the range indicated in the scope of ISO 6336‑1 and ISO 10300‑1.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Methods for the determination of allowable stress numbers
4.1 General
4.2 Method A
4.3 Method B
4.4 Method Br
4.5 Method Bk
4.6 Method Bp
5 Standard allowable stress numbers — Method B
5.1 Application
5.2 Allowable stress number (contact), σH lim
5.3 Bending stress number values for σF lim and σFE
5.3.1 Nominal stress numbers (bending), σF lim
5.3.2 Allowable stress number (bending), σFE
5.3.3 Reversed bending
5.4 Graphs for σH lim and σF lim and σFE
5.5 Calculation of σH lim and σF lim
5.6 Hardening depth of surface hardened gears in finished condition
5.6.1 General
5.6.2 Case depth of carburized and hardened gears
5.6.3 Nitriding hardening depth of nitrided gears
6 Requirements for material quality and heat treatment
6.1 General aspects
6.2 Normalized low carbon or cast steel, plain carbon, unalloyed steels (see Figures 1 and 2)
6.3 Black malleable cast iron [see Figures 3 a) and 4 a)]
6.4 Other materials [see Figures 3 b), 3 c), 4 b), 4 c), 5 to 16]
6.5 Coupon
6.6 Mechanical cleaning by shot blasting
6.7 Shot peening
6.7.1 General
6.7.2 Strength enhancement
6.7.3 Salvage
Annex A (informative) Considerations of size of controlling section for through hardened gearing
Annex B (informative) Core hardness coefficients
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Methods for the determination of allowable stress numbers
4.1 General
4.2 Method A
4.3 Method B
4.4 Method Br
4.5 Method Bk
4.6 Method Bp
5 Standard allowable stress numbers — Method B
5.1 Application
5.2 Allowable stress number (contact), σH lim
5.3 Bending stress number values for σF lim and σFE
5.3.1 Nominal stress numbers (bending), σF lim
5.3.2 Allowable stress number (bending), σFE
5.3.3 Reversed bending
5.4 Graphs for σH lim and σF lim and σFE
5.5 Calculation of σH lim and σF lim
5.6 Hardening depth of surface hardened gears in finished condition
5.6.1 General
5.6.2 Case depth of carburized and hardened gears
5.6.3 Nitriding hardening depth of nitrided gears
6 Requirements for material quality and heat treatment
6.1 General aspects
6.2 Normalized low carbon or cast steel, plain carbon, unalloyed steels (see Figures 1 and 2)
6.3 Black malleable cast iron [see Figures 3 a) and 4 a)]
6.4 Other materials [see Figures 3 b), 3 c), 4 b), 4 c), 5 to 16]
6.5 Coupon
6.6 Mechanical cleaning by shot blasting
6.7 Shot peening
6.7.1 General
6.7.2 Strength enhancement
6.7.3 Salvage
Annex A (informative) Considerations of size of controlling section for through hardened gearing
Annex B (informative) Core hardness coefficients
Bibliography