A quenching furnace is a furnace used to heat workpieces before quenching. Quenching is the process of heating a workpiece in a furnace to a quenching temperature above the critical point and maintaining it for a period of time, then quickly removing the workpiece from the furnace and putting it into a quenching solution (oil or water) for quenching. The heat source of the furnace can be electricity and fuel, and the temperature can be measured by a thermocouple. Furnaces that use electricity, gas, and liquid fuels can be automatically controlled and regulated for temperature using instruments.
In the past, aluminum alloy extruded products were treated with nitrate (KNO3) bath. With the increase in length of aluminum alloy extruded products, this quenching method has been phased out. At present, the most common type of quenching furnace both domestically and internationally is the vertical quenching furnace, with the quenching tank directly located under the furnace. This quenching furnace has the following characteristics:
(1) Before quenching, extruded products can be uniformly and rapidly heated;
(2) Put the material into the quenching pool in the shortest possible time;
(3) It can avoid bending and twisting deformation of extruded products caused by self weight and heating, which is beneficial for maintaining the appearance of the products;
(4) The mechanical properties of the extruded products after quenching are uniform.
Service conditions of quenching furnace
(1) Indoor use.
(2) The ambient temperature is within the range of -5 ℃ to 40 ℃.
(3) The monthly average relative humidity in the usage area shall not exceed 85%, and the monthly average temperature shall not exceed 30 ℃.
(4) There are no conductive dust, explosive gases, or corrosive gases that can seriously damage metals and insulation around.
(5) There is no obvious vibration or turbulence.
