QDS124

QDS Series Dual Chamber Over/Under Small Heat Treating Furnaces 2350°F / 1250°F (1285°C / 675°C)

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LOCKED BY SERIES
Type Small Dual Chamber
Power Source Electric
Loading Front
Uniformity AMS Class 4 (± 20ºF / 10ºC)
Atmosphere Air
Lining Brick

Applications

LOCKED BY SERIES

Description

The QDS Series Dual Chamber Heat Treating furnaces feature a 2350°F (1285°C) high heat chamber for hardening and a 1250°F (675°C) recirculating oven for tempering. The over/under configuration saves floor space. The hardening furnace is mounted on top with the tempering oven below. Agitated and heated quench tanks are optional. The furnaces achieve high precision by featuring highly accurate controls, solid state contactors for fast cycle times, two zone control (top and bottom) on the hardening furnace, and very even spacing of elements. The tempering oven features a fan and recirculation muffle for high uniformity.


Processes


Markets

Specifications

Dimension
W
H
D
Inside
13
12
25
Working
10
10
20
External
55
78
56
Hearth
11
-
22
Hard Chamb Inside
13
12
25
Hard Chamb Work
10
10
20
Temp Chamb Muffle
10
12
22
Work Cubic Feet 1.15
* All dimensions in inches unless otherwise specified.
Power
Standard Pwr 9
High Power 8
Hard Chamb Pwr 10
Temp Chamb Pwr 8
Element # 16
* All power values in KW unless otherwise specified.
Weight
Ship Weight 1300
Max Load 125
* All weights in Lbs unless otherwise specified.


Additional Features

SPRING LOADED VERTICAL PLUG DOOR
The hardening furnace door is a spring loaded swing up vertical door. The spring holds the door tightly closed, counterbalances it while opening, and holds it up while open. The hot face of the door is kept from the operator. There is a 1/2” refractory p lug which protrudes into the furnace chamber and provides an effective heat lock. There is a 2” refractory seal around the perimeter of the door. The tempering oven door is a single pivoted horizontal door hinged on the left. It also has a 1/2” plug for a heat lock.
HARDENING FURNACE FEATURES CERAMIC HEARTH
The standard hearth for the hardening furnace is a 3/4” thick ceramic plate elevated on ceramic standoffs 1/2” above the bottom.
DIGITAL PID CONTROL SYSTEM
The standard controls are Honeywell UDC 2500 digital PID 3 mode tuning controls. All fuses, transformers, contactors, and controls are housed in a NEMA 1 panel. Quiet, long life solid state power contactors are standard. There is two zone control (top and bottom) on the hardening furnace. The thermocouples are Type K. Thermocouple break protection is included. Limit switches shut off power when doors are opened or the backs are removed. Control voltage is transformed to 120 volts. A NEMA 13 lighted On/Off s witch is included. The control circuit and each power branch circuit are fully fused. A Honeywell UDC 1200 digital high limit back up control with manual reset, back up contactors and separate thermocouple is standard for each chamber. Customer must connect fused power supply to single point on panel.
TWO ZONES AND EVEN ELEMENT PLACEMENT
The elements of the hardening furnace are divided into top and bottom zones. The control output is routed through two input switches which allow adjustment of the total time on to each zone. There are thermocouples mounted in the top and bottom with a selector switch to read the temperature differential. The elements in the hardening furnace are evenly spaced on the top, bottom and sides for even heating. Elements in the tempering oven are on the sides. The elements are supported in proprietary high temperature ceramic element holders. These provide perfect support for the coiled element as well as excellent radiating characteristics. The smooth surface prevents premature failure of the element as it expands and contracts. The standard elements are iron-aluminum-chrome alloy.
HIGH UNIFORMITY
The hardening furnace is uniform to within +/-20F(+/-10C) above 1500F (815C). The tempering oven is uniform to within +/-10F (+/-5C) above 300F (150C).
TESTING AND INSTRUCTIONS
The furnace is power tested to insure proper watt ratings. The controls are fully calibrated and the control system completely tested. A complete instruction manual includes easy start up instructions, theory of operation, maintenance instructions, parts list, general dimension drawing, general assembly and subassembly drawings where required, and a detailed trouble shooting guide. A ladder logic diagram and panel layout are prepared on CAD for easy readability.
WARRANTY
The furnace is warranted for one year except for elements and thermocouples which are warranted for six months. See warranty sheet Q12W.
FAN AND RECIRCULATION MUFFLE
The tempering oven features a back mounted alloy fan. It is belt driven with a 1/6 H.P. motor. A heat dissipater protects the bearings. The removable recirculation muffle is constructed of 304 stainless steel. The muffle protects the work from direct radiation of the elements and creates a recirculation pattern for the air.
EFFICIENT MULTILAYERED INSULATION
Both chambers are insulated with 2-1/2” of low K factor refractory firebrick as the primary insulation. This is backed up by 2” of very low K factor mineral wool board on all surfaces except the bottom which has 2” of hard calcium silicate back up for solid hearth support. This yields an excellent combination of strength, insulating quality and fast heat up and cool down time. All refractory is coated with a special facing that prolongs firebrick life and helps prevent spalling and dusting. The refractory sections are available completely shaped for easy replacement without cementing. All sections fit together with engineered heat locks which improve the insulating integrity of the furnace. No asbestos is used.
INTEGRATED CASE
Both chambers are mounted in one integrated 10 gauge steel case with structural stiffeners and lifting rings. The entire case is primed with 800F silicone paint and finished in machine enamel

Additional Options

AGITATED AND HEATED QUENCH TANKS
AGITATED HEATED QUENCH TANKS
AGITATED QUENCH TANK
AGITATED QUENCH TANKS
ALLOY HEARTHS
Lower temperature furnaces are available with fabricated alloy hearths. These have welded sides (normally 1" high) and reinforced bottoms. 304, 330 and Inconel 601 series stainless steels are commonly used.
CONTROL, RECORDER AND ELECTRICAL OPTIONS
CONTROL, RECORDER AND ELECTRICAL OPTIONS
HIGH K.W. FOR HARDENING CHAMBER
Available on hardening furnace only. Increases K.W. from 8.0 to 12.0 by adding another element plate on the bottom. This reduces the available working space by 2 inches.
INERT GAS PANEL
The furnace case is tightly sealed for use with a protective inert atmosphere. Argon, nitrogen and gases enriched with up to 4% combustible gas (such as hydrogen or propane) can be used. No safety systems are required. A threaded alloy fitting introduces the gas into the furnace chamber. The element connection chamber is typically purged. The door seal is augmented with a woven ceramic fiber gasket. A properly sized flowmeter/regulator is included with the atmosphere system. A rule of thumb on atmosphere usage is to figure six to ten times the furnace volume times the number of hours the work will be in the furnace.
JIC CONTROL OPTION
This includes a NEMA 12 control cabinet, all oil tight switches and a panel mounted fused disconnect switch. Zone switches if included are percentage timers.
MISCELLANEOUS OPTIONS
MISC OPTIONS
SILICON CARBIDE HEARTHS - BENCH AND SMALL DUAL CHAMBER FURNACES
The optional hearths feature molded sides and are 1" thick.Silicon carbide features high strength at high temperatures, a non warping flat surface, and excellent heat transfer (which is important if there are elements under the hearth).
SINGLE ZONE SCR POWER CONTROLLER
A zero fired SCR power control with two-leg control is used instead of contactors. This is constructed with transient voltage protection, sub-cycle fuse protection, extra large heat sinks, and positive zero firing. Gain and bias adjustments are included for tuning.

Downloads

Brochure For QDS
Aerospace Brochure
Photo Sheet For QDS