Tag Archives: heat treating machined metal shafts

1000ºF Electric Rotary Hearth Oven

No. 982 is a 1000ºF, electrically-heated rotary hearth oven from The Grieve Corporation, currently used for heat treating machined metal shafts at a customer’s facility.  Workspace dimensions measure 24” W x 11” D x 30” H with a 26” dia. hearth constructed from overlapping steel plates with 24 pipes holding pin inserts to support the workpieces.   24 KW installed in Incoloy sheathed tubular heating elements provide power, while a 1000 CFM, 1 HP recirculating blower provides radiant horizontal airflow to the workload.  An additional cooling blower is mounted beneath the loading table to cool the parts in the front middle three positions of the hearth.

The hearth is driven by a 1/4 HP motor through a gear reducer with torque limiting device, variable from 0.1 to 0.5 revolutions per hour.  A loading table is provided in front of the oven to hold extra pin inserts (shown in photo).

This oven features an aluminized steel exterior and interior, an exhaust hood around the openings in the face of the unit with a 130 CFM exhaust fan, plus an integral oven leg stand.  The 8” thick wall insulation comprises 2” of 1900ºF block and 6” of 10 lb/cf density rockwool.

Controls on the No. 982 include a digital indicating temperature controller, manual reset excess temperature controller with separate contactors, recirculating blower airflow safety switch, fused disconnect switch and a 10” circular chart recorder.

For more information, please contact:

THE GRIEVE CORPORATION
500 Hart Road
Round Lake, IL  60073-2898
Phone:  (847) 546-8225
Fax:  (847) 546-9210
Web:  www.grievecorp.com
Email:  sales@grievecorp.com
Attention:  Frank Calabrese, VP