Drop Bottom Furnaces meeting AMS 2750E specifications
Heat treatment of materials is performed to change or improve mechanical properties. The heat treat process for aluminum is called "precipitation hardening or solution heat treatment" mostly accomplished in a drop bottom oven with integrated quench tanks. When heating alloys above a certain temperature, it goes into a "solid solution". When held at this temperature long enough, all the alloy will have gone into solution, hence "solution heat treatment". To preserve this state, the material needs to be quenched within seconds in a drop bottom furnace. Process specifications such as AMS 2750E or NADCAP specify the pyrometric requirements for the furnace. Material specifications such as AMS 2770, AMS 2771, BAC 5621, Milspec 6088 specify for each material the heat treatment process such as soak temperature, drop times and quench temperature. The solution heat treat process is followed by a precipitation hardening process done in separate coolers or ovens.
Bottom drop industrial furnaces can be heated by electricity or fired by fuel gas. If the aluminum heat treat specification allow direct fuel gas firing, this technology has an economic advantage. If material specifications do not allow products of combustion, then electric or indirect fuel gas fired furnaces are the choice. Keith company has built class 1 furnaces according to AMS 2750E process specifications using all these technologies. To insure best temperature uniformity over a long period of time, we often choose downdraft designs for gas fired bottom drop furnaces for solution heat treatment processes. Electric heated kilns are often built with updraft air circulation if the load needs to be shielded from direct heating radiation.AMS 2750E Specifications:
Covers pyrometric requirements for thermal processing equipment used for heat treatment. It covers temperature sensors, instrumentation, thermal processing equipment, system accuracy tests and temperature uniformity surveys.
- Meets above aluminum heat treat specs
- Safe and simple operation
- 60-minute recovery and precise temperature control
- Automatic quenching of parts 7 second or better
- Space-saving design, requires minimal floor space
- Heavy duty construction for long service life
- Higher temperature operation for ferrous metal heat-treating
- Programmable temperature controls
- Data acquisition and integration with remote monitoring
- Customized parts, racks and hoists
- Gas or electric heating systems
- Custom sizes are available
Periodic redesigns assure these furnaces are always cost effective and efficient and will meet the most rigorous heat-treating specifications in effect. To best suit a shop layout, the quench tank may roll beneath the door or from side to side. Moreover, a single quench may service two or more furnaces
Learn more about AMS Specifications (PDF bottom of the page).
Contact Keith Company if you need any additional details regarding our furnaces.