Multi-Chamber Vacuum Furnaces
When you look to purchase anything in life, you always feel more comfortable when you go to the experts. Surface Combustion has more than 40 years of experience with multi-chamber gas and/or oil quenching vacuum furnace technology. This gives our customers the confidence level that our technology will work every time. This innovative and versatile style of furnace is an industry workhorse.
Surface® Combustion took the multi-chamber concept and perfected it by offering true vacuum tight sealing between the heating chamber and the quenching chamber. This is the heart of our design and what makes it work so well. A machined vacuum tight inner door separates the chambers and provides true vacuum, partial pressure or low-pressure carburizing processes to work independently and uninhibited from the gas quenching or oil quenching cooling chamber. No oil vapors cause process degradation or work load discoloration. The workloads are transferred between the different chambers using two styles of mechanisms. Normal sized loads use a telescoping carriage fork mechanism to move the load to and from the heating chamber. Heavier loads used a rack and pinion driven graphite carriage mechanism. Both transfer mechanisms are reliable and proven over time. The gas quenching option also provides for the added benefit of transferring a hot load into a cold chamber where it is backfilled and cooled via a high capacity recirculating fan directing the hot wind through water cooled finned cooling coils. The vacuum chambers are typically water jacketed, but options are available to eliminate some or all the water cooling in this area. The operating temperature range is typically from 1400°F to 2400°F.
Heating is performed under a vacuum, the level of which is determined by the pumping system selected. For vacuum levels down to 10 microns, a combination mechanical piston pump with a blower is used. If higher vacuum levels are required, a diffusion pumping system operating in conjunction with the base pumping systems would be used.
The inner chamber is typically graphite-based rigid board and/or felt with machined graphite resistance heating elements. All are mounted within a stainless steel inner chamber frame which allows for multiple rebuilds within the same frame. The heating elements are powered with a low voltage, high current variable reactance transformer.
Oil quenching is accomplished in a shrouded and agitated oil bath to uniformly direct and distribute the oil up through the workload for optimized quenching and minimized distortion. The oil can be heated via electric bayonet style heating elements and likewise is cooled after quenching to return the oil temperature to the setpoint.
Tight sealing inner door
Uniform 360° heating
Gas and oil quenching
Hot zone is always at temperature and evacuated leading to faster heating rates and cycle times
Gas quench chamber is always cold leading to faster cooling times over single-chamber vacuum furnaces
Can process bright work at higher vacuum levels than in a single-chamber vacuum furnace
Diffusion pump may not be required
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There are furnaces, and then there are Surface® furnaces
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