Box quenching furnace is a periodic operation furnace, which is suitable for the heat treatment of rod and long shaft parts. The structure of the box quenching furnace is: the furnace body is a cylindrical deep well, and the workpieces are vertically loaded into the furnace for heating by a special crane. The fuels used are usually gas and fuel oil. When electricity is used as the heat source, it is called well resistance furnace. The box type quenching furnace is generally arranged below the ground level of the workshop, or above the ground level, or half above and half below the ground level.

 

The names of box quenching furnace include: forced convection box quenching furnace, natural convection box quenching furnace, well gas carburizing furnace, etc. The box type quenching furnace can use gas or liquid fuel or electric heating. When using gas fuel, there are usually several small energy burners installed along the tangent direction of the inner wall of the furnace, which are evenly arranged in layers or spirals in height, so as to avoid direct flame scouring the workpiece and ensure uniform temperature in the furnace. When it is used for low-temperature tempering or oil as tender material, a thin muffle wall is built in the furnace to separate the combustion space from the heating space. However, the box quenching furnace with muffle wall has low fuel consumption.