Advantages and disadvantages of water-cooled guide rail stepping medium frequency induction heating furnace

The medium frequency induction heating furnace used for heating thermoforming blanks can be divided into two types: push type and stepping type according to the feeding method of the blank. The furnace type used is selected according to the size of the blank, productivity and heating temperature. Generally, small steel rods use push-type induction heating furnaces, and large steel rods use step-type induction heating furnaces and push-type medium frequency induction heating furnaces.

Since the feeding mechanism of the blank is relatively simple, it is easy to manufacture and maintain. The gap between the coil of the inductor and the blank is small. There is only a pile of cold water guide rails in the inductor, so the heating efficiency is high. However, because the blanks are pushed one by one It is recommended to forward that when the diameter of the blank is larger and the heating temperature is higher, bonding between the blanks is easy to occur. At the same time, because the blank is moving forward. The friction between the blank and the guide rail affects the service life of the guide rail. Another disadvantage is that when the furnace is shut down, the blanks remain in the inductor and cannot be fully pushed out. Therefore, this push-type induction heating furnace is suitable for heating blanks whose diameter is less than 60mm and the heating temperature is lower than 1200°C.

The stepping induction heating furnace has two pairs of water-cooled guide rails, and a pair of movable guide rails hold up the blank for horizontal movement. This increases the gap between the inductor coil and the blank, increases magnetic flux leakage, and reduces the heating of the inductor. Efficiency means that the power consumption is 50%-10% higher than that of push-type induction heating furnaces. Since the blank is held up by the movable guide rail for horizontal movement, there is no friction between the blank and the guide rail. There is no extrusion problem between the blanks. Although the heating temperature is high, there will be no bonding phenomenon. When the furnace needs to be shut down, all the blanks in the inductor can be removed. Therefore, the stepping induction heating furnace is suitable for blanks with a diameter greater than 80mm and a heating temperature above 1200°C.