Installation for annealing with the use of induction heating of steel in coils

 

(57) Abstract:

The invention relates to equipment for the heat treatment of metals and can be used in processes requiring fast heating and slow cooling at a given speed, in particular for spheroidizing and recrystallization annealing calibrated steel in coils. The basis of the invention the task is to create an installation for spheroidizing and recrystallization annealing with induction heating calibrated steel when rewinding of the rebellion in the rebellion, with high capacity, improved performance and providing good quality and uniformity of the structure and properties of heat-treated steel. The problem is solved by the fact that the apparatus for annealing with induction heating calibrated steel containing unwinding drum, pulling mechanism, the node heating, pyatitonnoy racks with winding drums and heaters stretching mechanism, provided with a device for varying diameters thermoablative steel, additionally introduced a host of varying the speed of rotation of the receiving drum (providing a compact arrangement the transmission is automatically changed at a constant rate of feed of the metal, and deformation (between the unwinding reel and pulling mechanism), providing the strain hardening of the metal before heating, the protective insulating shield between the heating block and the mechanism of formation of the rebellion. In TC are fans, as well as in each of the five positions of the individual actuators to rotate the winding drum, which generally ensures the uniformity of the temperature field inside the heat chamber. 5 Il.

The invention relates to equipment for the heat treatment of metals and can be used in processes requiring fast heating and slow cooling at a given speed, in particular for spheroidizing and recrystallization annealing calibrated steel in coils.

A device for slow cooling of the preheated wire rod containing insulating chamber located therein mutually in parallel in the direction of the vertical reference axis wheels for slow cooling, mounted for rotation on each axis and electrically insulated from one another. To each of the wheels is supplied electrical current, allowing the wheels heated to opredelennogo of the device consists of a complex metal structures, which does not provide a uniform temperature at the beginning and at the end of the rebellion. Cumbersome system temperature control heating reduces the reliability of the device in operation. In addition, the difficulty in filling the beginning of the rebellion in the device.

Closest to the proposed installation on the totality of symptoms is the setting for annealing HDTV calibrated steel containing unwinding drum stretching mechanism with a device for varying diameters thermoablative steel site heating, the screen and the heat chamber (TC) with winding drums, heaters and control devices and temperature control. TC is divided into situated around the circumference of the zone corresponding to the positions of the winding, process cooling, rapid cooling and unloading. Inside the TC on the position of the winding device of the formation of the rebellion. On the turntable under TC posted with the possibility of moving the positions of the LC winding reel rotation drive which has a device synchronization speed when winding and feeding speed steel [2].

This device has several disadvantages related to the inability of the operation of deformation p the th installation position between the inductor and the heat chamber is a steel guide Bush, which results in increased heat transfer from the surface of the heated metal in the initial moments of annealing, which leads to instability properties. On the other hand, the absence of protective temperature-controlled (heated) screen when moving the heated rod from the heating unit to the TC does not allow you to keep optimum annealing of steels with a narrow interval origenaly. In the prototype is difficult to ensure a homogeneous temperature field inside the LC that will not provide the desired uniformity of the structure and properties origimage metal. Dense styling riot is achieved through the use of a sophisticated electronic system based on the use of DC drive with automatic change speed. This electronic system in environments with strong electromagnetic interference generated by the inductor, works very reliably, which leads to downtime of the complex.

The basis of the invention the task is to create an installation for spheroidizing and recrystallization annealing with induction heating calibrated steel when rewinding of the rebellion in the rebellion, with high capacity, improved performance and provide horoshey fact, what to install for annealing with induction heating calibrated steel containing unwinding drum, pulling mechanism, the node heating, pyatitonnoy racks with winding drums and heaters stretching mechanism, provided with a device for varying diameters thermoablative steel, additionally introduced a host of varying the speed of rotation of the receiving drum (providing a compact arrangement of coils of wire), consisting of a two-stage chain drive, and gear ratio in first gear is automatically changed at a constant rate of feed of the metal, and the unit deformation (between the unwinding reel and pulling mechanism), providing the strain hardening of the metal before heating, protective calorigenically screen between the heating block and the mechanism of formation of the rebellion, in TC fan installed, as well as in each of the five positions of the individual actuators to rotate the winding drum, which in turn ensures the homogeneity of the temperature field inside the heat chamber.

In Fig. 1 presents a General view of the installation of Fig. 2 - heat chamber, a top view; Fig. 3 - section a-a in Fig. 2; Fig. 4 - forming device revolt in Fig. 5 - p is operating annealing calibrated steel contains unwinding the drum 1, the block deformation 2 stretching mechanism 3 with the device varying diameters thermoablative steel 4, site heat 5, protective calorigenically screen 6 and the heat chamber 7, is divided into zones corresponding to the positions of the winding 8, process cooling 9, accelerated cooling 10 with dushirovaniya 11 and unloading 12 and the fan 13. In the first position has a host of varying the speed of rotation of the receiving drum 25 with the coupling clutch. Moving coil round steel in the zones is carried out using a rotary drive 14 table 15 on which the circumference posted by foster on drums 16. At the bottom of the heat chamber is made a groove 17, which allows the rotation of the drums with one position. Directly in a heat chamber at the position of the winding is forming device rebellion, consisting of rollers 18, 19, 20. The axis of the roller 18 is made stationary. The roller 19 is placed on the lever crank mechanism, the automatic drive control which consists of a stop lever type 21 and sensor 22. To obtain the radius of bending in connection with the use of this system for different diameters thermoablative steel roller 20 is equipped with an adjusting mechanism went winding is provided gland roller 24. The receiving drum receives the rotation position of the winding from a host of varying the speed of rotation of the receiving drum 25 (located in the lower part of the turntable). The host of varying the speed of rotation of the winding drum (Fig. 5) consists of a reduction gear 35, the sprocket 36, 37, 38, 39, circuits 40 and 41, plate 42, a tensioning device 43 with the spring 44. Node 25 is connected with the actuator 26 of the pulling mechanism through the gear. The chambers are equipped with thermal insulation raising blinds 27. To create the specified cooling conditions thermoablative calibrated steel racks installed heaters 28 and the control device and temperature control 29. The surface of the drum in contact with the heated steel has a thermal insulation coating 30. Teploizolaziya 31 smoke houses made of fibrous material providing a temperature drop from 600oC inside the chamber 50oC and less on its surface. Node 25 is equipped with a coupling 33, and the receiving drum - coupling 34.

The device operates as follows. Steel with unwinding of the drum 1 is supplied to the unit deformation 2, then through the stretching mechanism 3, the device of the variation of the diameters of 4, which is preset to the desired raaga metal due to heating of the screen spiral nichrome heaters, gets into racks on the bending rollers 18, 19, 20 of the device forming riot. Previously, before the roll-out set using helical gears 32 bending radius corresponding to the diameter thermoablative steel. A deflection roller 19 at the initial feed rod is pressed. Round steel, moving rectilinearly, clicks on the stop 21 of the lever rotates the axis with the Cam and actuates the sensor 22. The command to the actuator arm mechanism and the roller 19 is in its working position, in which the formation of spirals riot, falling under its own weight on a rotary receiving drum 16. After the formation of the riot team is on the rise shutters 27, activates the actuator 14 is carried out and the turn table 15, the angular step. When this rebellion thermoablative steel is moved from the position of the winding 8 on the position of technological cooling 9. Blinds are lowered. In the following turns steel riot with t<500C enters the chamber accelerated cooling 10, where comes in the device dushirovaniya 11 then passes into the discharge area 12. Simultaneously with the movement formed a riot on the position of the slow cooling free winding drum turn signals 25 and coupling 34 winding drum begins its forced rotation, associated with the speed of the actuator 26, and the formation of a new rebellion. The heaters 28 generate a certain amount of heat, which in combination with the amount of heat given up by the hot steel provides for the maintenance of a constant temperature mode, the positions of the winding and slow cooling, which is selected from the required cooling rate in the range from a temperature up to 500oC, which corresponds to 0.5 to 0.05oC/S. the control Device and temperature control 29 adjusts the operation of the heaters. To ensure uniformity of the temperature field inside the heat chamber has a fan that provides the convection of heated air, and individual drives provide continuous rotation of the winding drum, which also contributes to the development of a uniform cooling conditions of the wire in the rebellion.

The host of varying the speed of rotation of the winding drum works in the following way: from the main drive 26 (Fig.1) rotation by means of a chain drive 32 (Fig. 3), the sprocket 36 (Fig. 5), the gear 35 is transmitted to the sprocket 37, which on the output shaft 42 of the gear set with adjustable eccentricity "e" (Fig. 5). Due to the eccentricity of the linear speed of the chain is the rate.

Installation for annealing with the use of induction heating of steel in coils, containing unwinding drum stretching mechanism with a device for varying diameters thermoablative steel site heating and pyatitonnoy racks with foster drums, forming device rebellion, heaters and devices to control and regulate temperature, characterized in that it further comprises a unit deformation, ensuring the strain hardening of the metal before heating, the host of varying the speed of rotation of the receiving drum, consisting of a two-stage chain drive, and the gear ratio at the first stage of the transmission is automatically changed at a constant rate of feed of the metal, temperature-controlled protective screen located between the node of the heating and heat chamber, thus the heat chamber is additionally equipped with a fan and private drives rotation of the receiving drum.

 

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EFFECT: lowered lengthwise thickness difference of tubes.

3 cl, 1 dwg, 1 tbl

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EFFECT: ensured optimal conditions for cold die forging of high-strength geometrically complex fastening members and simultaneously improved steel hardenability characteristics.

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EFFECT: ensured optimal conditions for cold die forging of high-strength geometrically complex fastening members and simultaneously improved steel hardenability characteristics.

FIELD: ferrous metallurgy.

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FIELD: ferrous metallurgy.

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EFFECT: ensured optimal conditions for cold die forging of high-strength geometrically complex fastening members and simultaneously improved steel hardenability characteristics.

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