DAMPER FLANGE ASSEMBLIES
bearings in the power house have always caused maintenance
problems due to heat and poor lubrication practices.
Changing to dry GRAPHALLOY material eliminates the
need for any lubricant which would burn-off, gum-up
or harden at these higher temperatures. At one installation,
the upgrade to GRAPHALLOY flange blocks resulted in
maintenance-free operation for more than seven years.
TAP GATE CAM FOLLOWERS
Does Not Seize
design of a furnace tap gate, the 18 in, X 15 in.
metal plate slides open and closed via cam followers
rolling on stationary rails. Although the travel
is short and the gate opens only once an hour, conventional
grease-lubricated cam followers would certainly
lock-up when exposed to the expected 750o F.
Therefore the OEM chose this component with GRAPHALLOY
bearing material. It was dimensionally interchangeable
with needle bearing configuration, but required
BED LINE UP ROLL PILLOW BLOCKS
Saves Maintenance Costs
pillow blocks supporting the line up rolls originally
had grease lubricated ball bearings. However, the
combination of high temperature and intermittent
operation caused frequent maintenance problems...
numerous bearing replacements, seizures with the
resulting roll "flat spot" repairs, and
the occasional production line shut down. The engineering
solution was to replace the OEM supplied ball bearings
with interchangeable pillow blocks, using GRAPHALLOY
busings. The initial cost was higher, but annual
dollar savings in roll life, replacements, labor
and lubricants was over $200,000.
PINCH ROLL BUSHINGS
GRAPHALLOY Increases Equipment
temperature of an annealing furnace is in the range of 1200 F. Even though bearings
supporting the pinch rolls are outside the walls, they still reach temperatures
up to 750o F... and yet must be able to compensate for shaft expansion from cold
start-up to production temperature levels. Rigid, grease lubricated rolling element
bearings could not meet these conditions, so the operators specified GRAPHALLOY
journal sleeve bushings--sized for installation in a special metal shell and inserted
into the existing housing. Since 1990 the design has been operating successfully
in this fortuous environment.