Round steel quenching and tempering furnace

The round steel quenching and tempering furnace mainly uses induction heating modulated by round steel, bar stock, wire, and steel rod to realize the quenching and tempering function.

1. Main technical indicators of round steel quenching and tempering furnace production line

1. Quenched and tempered material: 30MnSi

2. Round steel and wire specifications: Φ7.1-Φ12.6mm

3. Quenching temperature: 930-960℃ Tempering temperature: 400-460℃

4. Heating power consumption of round steel quenching and tempering furnace: about 370 degrees/ton

5. Working mode of round steel quenching and tempering furnace: continuous working system

6. Center elevation of round steel quenching and tempering furnace production line: 1000mm

7. Feeding direction of round steel quenching and tempering furnace production line: left (right) feed

8. Power distribution requirements for round steel quenching and tempering furnaces: total installed capacity of each line: 1250KVA years

9. Round steel quenching and tempering furnace output: 60,000 tons/year, consisting of 4 lines.

10. The highest operating line speed of the round steel quenching and tempering furnace production line:

Φ7.1mm————100m/min

Φ9.0mm————90m/min

Φ10.7mm———–60m/min

Φ12.6mm———–40m/min

12. Cooling water requirements for round steel quenching and tempering furnace production line (single line):

a. Product circulating cooling water

Flow: 100m3/h Pressure: 0.4MPa

Water temperature: not higher than 33℃

Water quality: Urban water supply water quality standard CJ/T206-2005 (Ministry of Construction)

b. Cooling water for induction heating furnace:

Flow: 100m3/h Pressure: 0.4MPa

Water temperature: not higher than 33℃

Water quality: Urban water supply water quality standard CJ/T206-2005 (Ministry of Construction)

c. Compressed air requirements (single line):

Dosage: 3m3/min Pressure: 0.6MPa Water temperature: not higher than 33℃

Compressed air quality: GB/T13277-91 “Compressed air quality grade for general use”

2. Equipment configuration and description of round steel quenching and tempering furnace production line:

Each round steel quenching and tempering furnace PC steel bar is produced by drawing forming equipment, traction transmission equipment, all-solid static frequency conversion heating power supply, induction heating furnace, spray cooling water tank, hydraulic shearing and reversing equipment, wire take-up equipment, and AC motor It is composed of variable frequency control system, PLC control system, temperature measurement system and central centralized control unit.

Each production line equipment specifically includes:

1. Mechanical part:

Pay-off rack set

Cable management frame 1

Mechanical derusting machine 1

Drawing forming machine 1

Straightening machine 1 set

Cleaning machine 1

1#Towing machine 1 set

Quenching water tank 1

Tempering sink 1

2#Traction machine 1 set

Hydraulic shearing reversing machine 1 set

Take-up machine 2

2. Composition of round steel quenching and tempering furnace:

KGPS-500KW/6KHZ medium frequency induction heating power supply 1 set

CYP-200KW/40KHZ IGBT super audio frequency induction heating power supply 1 set

CYP-200KW/50HZ IGBT super audio frequency induction heating power supply 1 set

KGPS-250KW/8KHZ KGPS intermediate frequency induction heating power supply 1 set

One set of frequency conversion cabinet

90KW (wire drawing machine drive) 1 set

5.5KW (drive of the scoring machine) 1 set

11KW (driven by tractor) 2 sets

4KW (drive of take-up machine) 2 sets

Operation console and operation box 6 sets

Main console 1

Take-up operation box 2 sets

Jog operation box (mechanical descaling, tractor, drawing machine each) 3 sets

Thermometer (temperature measuring range 300-1000℃) two

3. Mechanical equipment composition and technical performance of round steel quenching and tempering furnace

(1) The double-arm rotating structure of the pay-off frame, the center sleeve is connected with the fixed column through the bearing, the center sleeve can be rotated and positioned lightly, and the wire rod suspension arm is connected with the center sleeve by bolts, which can rotate lightly when changing the reel, and position it when paying off , It is convenient to connect the wire rod head and tail.

(2) Wire management frame The wire management frame is a tapered structure, and its purpose is to change the wire rod ring shape to a linear shape to prevent disordered wires.

(3) Mechanical rust remover The mechanical rust remover consists of 2 sets of 90-degree repeated bending rollers. Driven by motor-lifter-lead screw (or pneumatic), the movable bending roller is pushed to extend or retract. Ensure sufficient bending angle between the steel bar and the bending roller to peel off the oxide scale to the maximum. After the oxide skin is peeled off, it falls into the collection tank below for easy cleaning. Fully sealed structure is adopted to prevent dust from escaping in the workshop.

(4) The PC steel rod concave thread forming of the drawing machine adopts the method of matching the drawing speed and the rotation speed of the mold. The mold is well stressed, the mold life is long, and the lead of the steel rod is artificially controlled to ensure the appearance quality of the product. The reducer of the wire drawing machine adopts a medium-hard tooth surface reducer, and there are protective devices at the tank body and the belt. The wire drawing tank is equipped with a shut-down pneumatic pinch roller to prevent the machine from shutting down and disordering the line. The diameter of the reel is 900mm, the maximum drawing speed is 100m/min, the wire drawing machine motor is 90KW, and the rotary die motor is 5.5KW.

(5) Straightening machine The straightening machine is passive and consists of two sets of bending rolls forming 90 degrees each other. Under the power of the tractor, it forms a tension straightening and straightening the steel bar.

(6) Washing machine The washing machine is composed of 2 sets of steel wire wheels, driven by a motor, to remove debris on the surface of the steel rod. The motor is 0.55KW, and the reducer is a continuously variable transmission reducer.

(7) There are two tractors. They are respectively placed in front of the quenching heating furnace, and after the tempering and cooling device, they play the role of full-line dragging. The traction machine is composed of three pairs of traction rollers, the lower roller is active and the upper roller is passive. The lower roller device is on the output of a non-standard transmission box with a single shaft input and three output shafts. The upper roller device is in the chute of the upper sliding frame. Keep to ensure the clamping force of the steel bar and ensure the smooth operation of the steel bar. The two tractors adopt micro-tension control technology, which can adjust the tension at any time according to the process needs and keep it between the two tractors. The micro-tension control technology can be used to adjust the tension and maintain at any time according to the process needs, which is automatic control between the two tractors. Under the formation of constant tension to provide guarantee to meet the needs of product quality. The traction roller is composed of two grooves, and the traction roller is arranged on the optical axis through an expansion sleeve to facilitate the replacement of the traction roller. The motor is 11KW, and the reducer is a planetary cycloid reducer.

(8) Quenching and tempering cooling device The quenching and tempering cooling device is made of stainless steel plate, the cooling method is water cooling, and the outlet end is equipped with an air blowing device. The quenching tank is 6 meters long, and the tempering tank is 5 meters long

(9) The hydraulic reversing shearing machine guarantees synchronous cutting and reversing according to the requirements of rapid cutting of the production line, ensuring 100% shear reversing, and ensuring continuous operation of the production line. The hydraulic station motor is 2.2KW.

(10) The take-up machine is designed according to the requirements of steel bar pay-off, and the rotation speed of the take-up reel changes regularly with the running speed of the steel bar, realizing regular wiring. The motor is 4kw, and the reducer is a worm gear reducer.