Vertical Pit Vacuum Heat Treat Furnace
Model 22-GR-3830-17TF Heat Treat Furnace

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Lindberg top-loading vacuum furnaces provide fast, efficient, and economical heat-treating. Temperature range to 2400°F.

The heat treat furnace system offers a variety of temperature and vacuum controls to meet a broad range or process requirements. And there are a number of two-stage mechanical blower pump systems and diffusion pump systems available. The pumping system brings the vacuum to levels needed in your particular application. Lindberg will recommend a proven pumping system that will give you the precise control, speed, and economy of operation you require.

Loading and unloading are made easier through the use of a full swing cover with an air-operated lift. The vacuum chamber contains no sliding parts or air cylinder shafts, thus reducing maintenance. The system heats and cools efficiently without moving the load.

An externally mounted motor powers the cooling fan and eliminates vacuum-sealed motor maintenance problems. A minimal maintenance vacuum seal is utilized on the fan shaft to ensure a positive seal. The cooling fan circulates inert gas through the workload and the internally mounted heat exchangers at pressures up to 2 PSI (positive) to ensure fast, efficient cooling.

Rugged graphite tube heating elements are individually replaceable. Vertical side wall element array operates on low voltage, three-phase secondary to eliminate corona effect and line unbalance.

The heat shield assembly consists of a shingled, Grafoil hot face backed with low density, lightweight fiber insulation, mounted on a steel module. The use of lightweight fiber insulation ensures rapid heat-up and cool down while minimizing power requirements.

Heat Treat Furnace
Features / Benefits

• Microprocessor-based controls—programmable controller provides maximum control flexibility.
• Chart Recorder
• Furnace interlocks that shut off heating element power when chamber exceeds preset vacuum or when vacuum loss occurs; also when water flow is interrupted or excess temperature is indicated.
• Energy savings—vacuum system uses power only when processing.
• Greater load capacity—pit style furnace takes up less floor space than horizontal front loading furnaces.
• Vacuum systems negate the need for expensive atmosphere generating systems
• Clean working environment—vacuum furnaces can be used in air-conditioned plants since water-jacked shell minimizes heat released into the room. The furnace pumping system removes contaminants.

Heat Treat Furnace Options

• Automatic leak rate detection system
• High temperature cast super Alloy grid
• Surge tank, provides rapid gas backfill for cooling cycles
• Oil mist separator, removes oil smog and liquid from pump exhaust
• Thermocouple vacuum gauge tube filters, set of two removes solid particles and condensable gases from gage tube
• Thermocouple feed thru
• FM approval and stamped drawings
• IRI approval and stamped drawings
• Water circulation system
• Baskets
• Lifting yoke
• Sight glass

Heat Treat Furnace Applications

• Aging
• Annealing
• Brazing
• Ceramic firing
• Hardening
• Sintering
• Solution Treating
• Stress Relieving
• Vacuum Heat Treating