At present, in the application of induction heating furnace, it is mainly used to heat workpieces with relatively simple shapes, such as cylinders or billets. When the induction heating furnace is used for workpieces with variable cross-sections or workpieces with complex shapes, since the heating temperature of the workpieces is difficult to achieve uniformity, induction heating furnaces are rarely used for workpieces of this shape, and they are generally heated in resistance furnaces or flame furnaces. , Which greatly restricts the widespread use of induction heating furnaces. For the induction heating furnace for workpieces with variable cross-sections or workpieces with more complicated shapes, the key is to design a suitable inductor or use a special process to make the heating temperature of the workpiece uniform.
For example, for the induction heating furnace of the crankshaft, due to the complicated shape of the crankshaft, it is necessary to consider the heating efficiency of the inductor and the convenience of loading and unloading. Such a workpiece has to be integrated with an induction heating furnace to adapt the shape of the inductor to the shape of the workpiece. The induction coil in the induction heating furnace device for this crankshaft is wound with a 12mm x 15mm pure copper tube, with a total of 12 turns. When heating, two crankshafts are placed in the inductor at the same time. The relevant parameters are as follows:
Current frequency: 2500Hz
Terminal voltage of the sensor: 700V
Crankshaft mass: 4.55kg
Heating temperature: 1200Y
Heating time: 80s
The power of the sensor: 110 -100 -80kW
Power factor (leading): 0.92
Inductor current: 220-160A
Capacitor capacity: 1250kVAR
Power consumption per unit product: 560kW • h/t
This type of crankshaft induction heating furnace device is not convenient for mechanical operation when loading and unloading materials, and the temperature difference of the heated crankshaft over the full length is 100Y, and the unit product power consumption is also high.
Variable cross-section workpieces also have a connecting rod induction heating furnace. This kind of inductor can heat the entire cross section of the connecting rod more uniformly, and it is easy to realize mechanization in loading and unloading. The workpiece can enter from one end of the inductor and be heated by the inductor. , Pushed out from the other end of the sensor.
