The bearing steel tube billet induction heating furnace is characterized in that the induction heating furnace is divided into a preheating furnace section, a heating furnace section and a uniform temperature furnace section, which are arranged in a line and are all set on a heating bed. There is a gap between the preheating furnace section and the heating furnace section. There are guide wheels in between, the heating furnace section is connected to the uniform temperature furnace section, a guide rail is set in the heating furnace, and the tube blank moves linearly on the heating furnace guide rail. The intermediate frequency induction heating furnace can make the temperature of the heated bearing steel tube billets in the heating furnace of each furnace section strictly according to the designed heating specifications. The different furnace sections are heated in sections to achieve uniform heat penetration and ensure that the core surface temperature difference of the tube blank is less than 15 ℃. The head-to-tail temperature difference is less than 30 ℃, which fully meets the requirements of hot-rolled piercing for the temperature of the billet.
The following describes the implementation process of the intermediate frequency induction heating furnace for bearing steel tube billets with reference to the drawings:
(1) The intermediate frequency induction heating furnace for bearing steel tube billets is composed of preheating furnace section 4.1, heating furnace section 4.2, and soaking furnace section 4.3, preheating furnace section 4.1, heating furnace section 4.2, equalizing furnace section 4.3, and guide wheels 4.5%. It is arranged in a straight line and installed on the heating bed 5 with the center of each heating furnace consistent. There is a certain gap 6 between the preheating furnace section 4.1 and the heating furnace section 4.2, and a guide wheel 4.5 is installed in the middle. The heating furnace section 4.2 is arranged next to the uniform temperature furnace section 4.3. The heating furnace is equipped with a guide rail 4.6, which allows the bearing steel tube blank to pass smoothly on the guide rail 4.6 without
Damage to the heating furnace refractory lining 4.13.
(B) the use of induction heating furnace:
The bearing steel tube blank is slowly and continuously heated by the feeding machine into the preheating furnace section 4.1. The bearing steel tube heats up due to the induced current. This heating is formed inside the tube blank, so the heating speed is relatively fast. The preheating furnace The parameters (length, copper tube size, turns) are determined by material specifications, properties, and output; after the preheating furnace section 4.1 passes through the guide wheel 4.5, the tube blank enters the heating furnace section 4.2 for rapid heating. The same heating furnace section parameters (length , Copper tube size, turns) are determined by the material specifications and properties; after the billet exits the heating furnace section 4.2, it enters the uniform temperature furnace section 4.3. The function of the uniform temperature furnace section 4.3 is to ensure that the core surface temperature difference is less than 15 ℃ The temperature difference between the head and the tail is less than 30 ° C. The parameters of the same temperature furnace section (length, copper tube size, turns) depend on the material specifications, properties, and requirements for the heating temperature. At 4.3 o'clock, the tube billet is pulled out by the discharging manipulator 6 at 4.3 o'clock to enter the next process. The entire linear movement of the tube billet in the heating furnace is performed on the guide rail 4.6, the role of the guide rail is to make the tube billet transportation stable without damaging the heating furnace lining 4. 13, the collector 4. 15 cooling water
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