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Heating method for surface quenching of forging flame

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Heating method for surface quenching of forging flame

Release date:2019-03-05 Author: Click:

Heating method of flame surface quenching for forgings, a brief discussion on ring forgings manufacturers

The heating method of flame surface quenching of forgings is roughly similar to that of induction surface heating, which is also divided into fixed method and continuous moving heating method. In the fixed method, flame nozzle can be used to spray flame on a local surface of forgings for heating. After reaching the quenching temperature, the nozzle can be removed and water pipe can be used for cooling (or compressed air cooling). In the fixation method, the flame nozzle can also be fixed in one position (or several nozzles surround the outer circle of the forgings), while the forgings rotate and are heated to quenching temperature and cooled by water jet nozzle.

The continuous moving heating method is to move the nozzle with cooling water nozzle on the heating surface of the forging, cooling and quenching while heating.

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.

When the flame is heated, the heat of the inner layer is conducted by the surface. 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, resulting in coarse grains and even burning damage.

Induction heating of forgings

Forgings with intermediate frequency and dual frequency induction heating, using a circular inductor on the body, from bottom to top continuous heating while water quenching. Such as cold roll, piston, cement mill wheel. Especially long forgings cannot be hoisted vertically on the quenching machine because of the limited length. They can only be laid horizontally with special inductor and transformer, crawling on the shaft or sliding along the guide rail.

Forgings shall be its bearing on the special rotary table, forgings by the great trust on the wheel rotation, and inside and outside the circle itself free expansion, the position of the sensor fixed and can be away from the heated surface gap between scale, this kind of sensor before and after expansion is mainly in the circle of local heating of shrinkage and changed the sensor and the surface of the heating clearance, clearance of change can affect heating speed and heating temperature, in order to maintain the sensor in combination with the stability of the heating surface gap, when heated expands, sensors with synchronous movement, thus in heating and outer surface of the large coil, The inductor and the coil face are always positioned with a positioner and the inductor can move forward or backward with the expansion of the coil heating face.

Intermediate frequency quenching of large forgings, due to tread the side convex platform, its height more than sensors and tread the gap distance, the sensor coil cannot be set into the tread, forging can be used to open like this separation, sensors, buckle on heating surface after sensors, separation after heated to a temperature sensor out walk round out open again after quenching or directly spray quenching inductor go round.


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