Heating method for flame surface quenching of forging parts

The heating method of forgings flame surface quenching is roughly similar to the induction surface heating, which is also divided into fixed method and continuous moving heating method. In the fixed method, the flame nozzle can be used to spray flame on a local surface of the forgings, and the nozzle can be removed after reaching the quenching temperature and cooled by water spraying (or cooled by compressed air). In the fixed method, the flame nozzle can also be fixed in a position (or several nozzles around the forgings) and the forgings rotate, heated to the quenching temperature with a spray nozzle cooling water.

Continuous moving heating method is to move the nozzle with cooling water nozzle on the forging heating surface, heating while cooling quenching.

Watch flames can see that it is divided into three areas: near the nozzle darker part as the flame core, is composed of oxygen and its decomposition gas, the temperature is low, its outer reduction zone for white, this is high flame temperature zone (up to 3100 ℃), it can quickly make the metal heating, melting, even outer for complete combustion zone, the temperature was lower than those of reduction zone.

The heat of the inner layer is conducted by the surface when the flame is heated. In order to make the forging rapidly heated to the quenching temperature in a certain depth, it is necessary to maintain the high temperature of the surface, which often makes the surface temperature too high, the grain is coarse, and even the phenomenon of burning.

this bucket teeth forgings produced by Tongxin precision forging company