Heat Shrink Ring Gear on Flywheel - Induction Heater

[CR100]

Can anyone suggest a induction heater manufacturer for heating a 14" ring gear to shrink fit it on to a flywheel.

We have tried a bearing heater with very little success. I talked to Ameritherm and they want $30,000 for a unit. This unit is a little overkill, but very nice.

 

[williedawg]

Is this a one-time need?
If so, why not heat it up in the kitchen oven?

If you're into production, buy an oven you can convert over.

We bought one just to affix stub shaft assemblies with plates about 6" deep to the inside a 10" tube about 8' long.

Heated up the end of the tube, the shaft assembly just slid right in. Got a heckuva shrink fit.

Paid $35 for the used oven. Cheap enough.

 

[mfgenggear]

CR100

where are you located?

what is the material of the ring gear & the fly wheel.
what is the inside diameter of the ring gear?
what is the outside diameter of the fly wheel.

call any heat treater in your area that has liquid nitrogen
for the fly wheel. & an oven to heat the ring gear.
if both are through harden then what is the final temper or hardness.

MfgEngGear

 

[Tmoose]

Induction heating can be nice and quick.

http://www.neon-john.org/Induction/heater.htm

Other methods' waste heat might be appreciated in cool weather.

reaching 400 F or so with oxyacetylene rosebud or even mapp gas is pretty quick, too, if you only want to do a few a day.

Like others said, an oven would work, although need more time to heat one up. Might load a stack of them in on third shift.

 

[CR100]

We've done the kitchen oven trick for a year now, and we are high enough production where this is not feasible anymore.

The torch idea, was thought of, but the safety involved and the additional heat transferred into the shop negated this idea.


I actually tested a conveyor pizza oven (Quiznos style) this was a convection/electric oven. It did work better then the standard oven, there were two problems. Firstly the air was blown from the top down, the 14" ring gear does not have all of surface area so the majority of the airflow went right passed the ring gear. This could be over come with some sheet metal changes.

The next problem was that there was 18" free space after the convection chamber before the ring exited the oven. This unfortunately allows the ring gear to cool before being reachable. Again we could fix this with some sheet metal fabrication.

Induction, is the best way to go.

 

[mfgenggear]

CR100

You make aerospace assemblies?
what are the details
uncontrolled ovens, & procedures.

Induction is the best way to go !!

have you tried the other way?

MfgEngGear