What is the process ? SR, hardening, Carburising ... ?
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Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
I am not sure what you wexactly mean by the ruling section. In the gear if you are carburizing - you rough hob it to almost final size except the profile correction allowance for grinding isn't it ?
In this stage you get the case depth based on DI (ie ideal diameter rating of the material and has nothing to do with the gear profile).
You have to achieve the uniform case depth through the flank and the root of teeth and your treatment (holding time will be deprndant on this).
Any way your result is going to be based on the test piece which is undergoing the same HT cycle as the gear and you are not going to cut the gears to find the case depth.
Your test piece must duplicate approximately the tooth profile (preferably) and must ensure that the material is going to be sufficient at the root so that you can check the case depth at root.
Not for gears but for some other components (with profiles), this is the procedure followed at our place.
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Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
The ruling section of any material is the maximum section of the material ( Diameter of the material or a section in any form equivalent to Diameter), which would give the physical properties inherent to the material. For example, 20MnCr5, ruling section is 63mm dia, above which it will not give the physical properties. Therefore, if a gear of 16 Module is made out of this material it will not withstand the torque or the load. The material is good for gear below 63mm dia. In case I use En 24 for heavy gear, I need to select the ruling section for the gear for HT. Which part of the gear should be taken as ruling section.
Sorry I missed the thread and forgot I left it hanging.
I advise you to refer AGMA/ANSI 2004 I have a copy of 1989 version, don't know it is latest or not. Check up the latest version
It is quite comprehensive and provides various tables for the sample size.
However it is quite clear as far as the clauses 4.8.4.1 and clauses 5.3.3 is there. The sample for raw material (cl 4.8.4.1 - separately cast piece) or Heat treatment (cl 5.3.3) is based on the tooth thickness/ Diametrical Pitch.
Also for through hardened gears you can refer to Appendix B (Approx maximum controlling section size considerations for through hardened Gears)
And it is abvious since the tooth are the areas that are weakest/ where the property is to be achieved.
I will advice you to go through the standard, in case you didn't trace it already.
Sorry for the delay.
PS: the standard is "Gear Material and Heat Treatment Manual" and covers IH, Fame Hardening, carburizing, Nitriding and Carbonitriding amongst other types of Ht
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Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
Thank you for your comments. Is it possible to send the copy of AGMA/ANSI 2004? I was expecting the answer from you. I am sure you are right. The teeth are the weakest and therefore should be taken as the ruling section. I would appreciate if you can send the standard.
b) Not permitted to send as per the copyright act.
Try to trace one and may procure it (of course a bit costly but the AGMA standards are use ful and informative esp if you are in manufacturing industry - or for even user industries like us)
However will try to provide data in case of specific query.
PS the std is 71 pages
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Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
Limiting Ruling Section for Gear and Pinion
Re: Limiting Ruling section for gear and pinion
