 | | From: | Jack | | Subject: | What kind of steel and hardening technology is used in making strong gears in gearboxes?? | | Date: | 3 Jan 2005 11:02:42 -0800 |
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 | Hello
My question is
What kind of steel and hardening technology is used in making strong
gears in gearboxes??
Thanks for any halp..and sorry for my english.
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| | From: | Uncle Al | | Subject: | Re: What kind of steel and hardening technology is used in making strong | | Date: | Mon, 03 Jan 2005 12:36:54 -0800 |
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| Jack wrote:
>
> Hello
> My question is
> What kind of steel and hardening technology is used in making strong
> gears in gearboxes??
> Thanks for any halp..and sorry for my english.
Google
"gear hardening" 294 hits
"gear steel" 3690 hits
gear "laser hardening" 929 hits
The four primary mechanisms are flame, induction,
carburizing/nitriding, and laser flash heating/cooling. 1035 hot
rolled and annealed steel is around Rockwell C5 to C15. Gears are
typically hardened to Rockwell C30 to C65. Hardening depth profile is
important - a hard surface with a tough core.
http://www.geartechnology.com/buyers/gt-heat.htm
--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf
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| | From: | Mark Thorson | | Subject: | Re: What kind of steel and hardening technology is used in making strong | | Date: | Mon, 03 Jan 2005 21:00:24 GMT |
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| Uncle Al wrote:
> The four primary mechanisms are flame, induction,
> carburizing/nitriding, and laser flash heating/cooling.
Not to mention shot peening. Generally speaking,
metal parts fail in tension, not compression. Unless
they have internal flaws, failure initiates at the surface.
By hammering the surface with round shot, compressive
stress can be built into the surface. That compressive
stress must be overcome before the surface can be
put in tension, so it raises the strength of the part.
Only large gears can be shot peened.
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