The steel billet adopts the heating method of medium frequency induction heating power supply

Hot-formed steel billets can be divided into round, profiled, rectangular, tubular and variable cross-sections according to the cross-section. Since the medium frequency induction annealing power supply focuses on the shape of the blank, this determines that blanks with different cross-sections cannot be heated in one inductor. At the same time, in order for the inductor to have high efficiency, the gap between the heated blank surface and the induction coil should be as small as possible, which limits the cross-sectional size of the blank that can be heated in an inductor. When there are many sizes of blanks with the same cross-sectional shape, the sizes of the blanks should be divided into several groups, and the billets in each group are heated in one inductor. If the cross-sectional sizes of the billets heated in one inductor are greatly different, , the heating efficiency of small-section billets is not high, the electrical efficiency is low, and it is uneconomical. The diameter size of a resistance billet is generally 10-15mm. If the billet has a smaller full size, the minimum value will be used, and if the billet has a larger cross-section size, the maximum value will be used. In actual production, a medium-frequency induction annealing power supply is used to heat billets with different cross-sectional shapes by replacing the induction furnace, or to heat billets with the same cross-section and large differences in size. For mass-produced steel billets, it is best to heat them in a dedicated induction furnace. Because in this case, the heating efficiency is higher and the power consumption per unit product is small. And because induction furnaces are recently used to heat a certain type of steel billet, its mechanization and automation of loading and unloading can be greatly improved.

For end-heated billets, locally heated billets, and billets with long memory of variable cross-section billets, they should be grouped separately to facilitate the selection of the induction heating furnace body.

According to the above requirements, hot-processed steel billets can be divided into the following five categories:

(1) Full length heated billet

(2) End-heated steel billet

(3) Partially heated billet, that is, heating a certain part of the billet.

(4) Heating of long steel billets, that is, the steel billets are heated continuously through the inductor.

(5) Heating of variable cross-section billets. This type of billet is heated with an inductor that also changes when it expires, or with an inductor with uneven spacing between induction coils.

Hot-formed steel billets are heated by medium-frequency induction heating power. According to the size of the billet and different heating requirements, it can be divided into the following types:

1. Periodic induction heating. That is, only one blank is put into the induction furnace for heating. After reaching the required heating temperature, the power supply is stopped, the heated blank is taken out of the furnace, and a cold steel billet is put in.

2. Sequential induction heating means placing several steel billets in the induction furnace at the same time. During the induction heating process, these steel billets dare to find a certain time rhythm and push them from one end of the induction furnace to the other, that is, no one is added from the feed end. A piece of cold steel billet is produced, and a piece of hot steel billet that has reached the heating temperature is produced except for the end. As the cold billet is fed in, the inductor continues to heat.

3. Continuous induction heating means that the long steel billet passes through the induction furnace continuously. During the process of advancing at a constant speed, the giant sword is heated to the required temperature, and the material is continuously discharged from the discharge end, and the sensor is continuously powered.