Aluminum on Steel Spline?
Aluminum on Steel Spline?
(OP)
I have a steel external spline. The new retrofit housing that fits on the spline will be aluminum 7050-T6 condition with hard anodize coating. The assembly is turned by an human, not a motor. There is no sliding on the spline. Stresses look OK but....
?Will this steel/aluminum interface wear out? We don't have experience in mixing the two. Any helpful, everyday experience out there?
?Will this steel/aluminum interface wear out? We don't have experience in mixing the two. Any helpful, everyday experience out there?





RE: Aluminum on Steel Spline?
What are the loads, size of the
spline, width, etc. If the loads
are light, no problem. I assume
because this is done by hand, that
the loads are light and that the
aluminum would be acceptable.
Normally it has about 1/2 the strength
of steel.
RE: Aluminum on Steel Spline?
1" length
1" nominial pitch dia.
48 teeth
SAE Standard 1946
The issue isn't the strength but the wear that may occur with the combo of steel+aluminum.
RE: Aluminum on Steel Spline?
RE: Aluminum on Steel Spline?
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Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Aluminum on Steel Spline?
I do not know if they have a product
that you could coat the spline with
before assembly. As israelkk states
if it does not slide, wear should
not be a consideration unless you
are using a much smaller spline
ie fewer teeth to drive the internal
spline. I assume this is not the case.
RE: Aluminum on Steel Spline?
Are there any radial or moment components to the load?
RE: Aluminum on Steel Spline?
There is no lubricate. The moment force around the splines longitudinal axis is 150 in*lbs.
So what do you think?
RE: Aluminum on Steel Spline?
If I simply used the old Lewis equation
Wn = SfY/Dp Yields
78000 x 1.00 x .6/48 yields 975 pounds.
at at .50inch radius would yield 487 inch pounds.
And this assume no tooth load sharing.
The Y factor of .6 that I chose is probably
also conservative. I assume too that you
are talking about a 30 degree involute spline.
S = Maximum Tensile Stress
f = face width
Y = Lewis equation constant (.60 is an assumption)
Dp = Diametral Pitch
RE: Aluminum on Steel Spline?
RE: Aluminum on Steel Spline?
with a hand operation that you would worry
about fretting and wear? Fretting normally
is high cycle vibration phenomenom and wear is
caused from sliding operations which you do
not have as mentioned by israelkk.
RE: Aluminum on Steel Spline?
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I have an application that an aluminum body runs in a 17-4 SS ring. The system is sees 850 lb-ins of torque.
Best Regards,
Heckler
Sr. Mechanical Engineer
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RE: Aluminum on Steel Spline?