Operation points of billet induction heating furnace

The purpose of the billet induction heating furnace : It is used to heat carbon steel, alloy steel, ball bearing steel, including ferritic steel and austenitic steel, to the maximum extrusion temperature of 1250℃T. Billet “plus hot” furnace heated to 1250 deg.] C after the punch a hole shall be due to a decrease in the temperature of the billet , “then the heating” furnace, and then extruded.

The induction heating furnace can process 4 kinds of billets with different diameters. Changing from one diameter billet to another diameter billet requires some adjustments to the furnace and replacement of the inductor.

The structure of the induction heating furnace : the induction heating furnace is vertical, with hydraulic transmission, which is convenient for automatic control.

The coil of the inductor is wound with a special-shaped pure copper tube, arranged in a single layer, cooled by water, with a magnetic conductor, and an open tube made of high temperature resistant material in the coil, and there is a protection between the coil and the heat resistant tube cylinder.

“Plus hot” and the furnace “re Technical Data heating” of the furnace are shown in Table 12-8.

Table 12-8 Technical parameters of heating furnace and reheating furnace

Serial number	name		“Plus hot” furnace		” Reheat” furnace
1	Rated power of adjustable transformer /kVA		850		700
2	Transformer power supply voltage/V		6000		6000
3	Transformer secondary voltage/level		10		10
4	Sensor power /kW		750		600
5	Blank material	Magnetic and non-magnetic steel		Magnetic and non-magnetic steel
6	Sensor connection	Simplex		Simplex
7	Maximum heating temperature /Y	1250		1250
8	Sensor voltage/V	600		600
9	Pressure of cooling water /Pa	3 X10 5		3 X10 5
10	Cooling water consumption/ (m 3 /h)	12		12

The dimensions of the billet and the inductor of the heating furnace are shown in Table 12-9.

Table 12-9 Relevant dimensions of the sensor (unit: mm)

Sensor number	A	B	C	D
Billet diameter	Φ 214	Φ 254	Φ 293	Φ 336
Billet length	307 – 1000	307 – 1000	307 – 1000	307 – 1000
Coil inner diameter	Φ 282	Φ 323	Φ 368	Φ 412
Coil turns	73 turns	73 turns	68 turns	68 turns
Coil height	1250	1250	1250	1250
Heat-resistant tube size	©231 / Φ 237	Φ 272/ Φ 278	Φ 13 0 / Φ 19 1	Φ 357/ Φ 363
Heat-resistant tube height	1490	1490	1490	1490
Protection tube size	Φ 241/ Φ 267	Φ 282/ Φ 308	Φ 323/ Φ 353	Φ 367/ Φ 97