Graphalloy bearing noise 1

[cadtocam]

We have an infrared heat glass ink drying oven. The glass is carried by conveyor rollers. As the roller direct exposed to high temperature infrared heaters, its surface temperature can be as high as 800 F. The roller two shaft ends are hidden from infrared heater and their temperature is about 500-600F. We use rated 750F graphalloy bearings (Metcar 2500 High Temperature

http://www.metcar.com/standardproducts.htm)

to support roller shaft ends. However, the problem is that those bearings have terrible noise.

The roller is 2.5” hollow steel tubing, 1/8” thickness wall, 110” LG, 1” shaft diameter. The roller speed is 6-19 rpm. Roller spacing is 8”. The product load is less than 20 pounds per roller. Rollers are inside the 5” insulated oven enclosure. The noise always exists with or without load, temperature high or low.

The bearing vendor thought the surface finishing of roller shaft caused the noise. We made the shaft surface finishing 16 microns as the vendor suggested, however, no any significant improvement, the noise is still there. Does anybody here can give me some suggestions or solutions? Thanks.

John

 

[hydtools]

Check running clearance. Too much clearance would let the running surfaces chatter.

What does Metcar recommend for running clearance?

Ted

 

[Ebenw]

Graphalloy is actually a brand name and the material is supplied by Graphite Metallizing. Try going to

http://www.graphalloy.com

to ask them for help.