Installation for annealing and hardening of calibrated steel

 

(57) Abstract:

The invention relates to equipment for thermal processing of metals and alloys and can be used mainly for recrystallization and spheroidizing annealing and quenching calibrated steel from mikrotechna temperature range (MCI), used in the manufacture of high-strength fasteners by the method of cold forming processes (GHOSH) without final heat treatment. The basis of the invention the task is to create an installation for spheroidizing annealing and quenching calibrated steel in coils, with high capacity, improved performance and providing good quality heat-treated steel. The problem is solved by the fact that to allow for annealing and hardening on the same line, hardening device is designed as a single sprayer, when this unit is supplied with the unit slow cooling, made in the form of a cylindrical refractory-lined chamber with artificial heating and temperature control. To provide a fine structure with the aim of increasing complex consumer is to ensure the smooth operation of the installation smachiwausa the device is made in the form of a block forming a coil and a two-position carousel. On the turntable off the carousel are two of the reeling drum, the rotational drive which has a device synchronization speed when winding and feeding speed steel. 2 Il.

The invention relates to equipment for thermal processing of metals and alloys and can be used mainly for recrystallization and spheroidizing annealing and quenching calibrated steel from mikrotechna temperature range (MCI), used in the manufacture of high-strength fasteners by the method of cold forming processes (GHOSH) without final heat treatment.

The traditional technology of execution of spheroidizing annealing steel involves heating in the cover furnace to a temperature equal to ACl+20+40oC, the shutter speed of about 24 h and cooling speeds < 0,5oC/C. the Total duration of the annealing is 20-25 hours hardening on the two-phase structure provides heating in microtechno interval followed by rapid cooling of the steel, and to ensure the stability properties requires accurate temperature maintenance.

A known technology for recrystallization - spheres is slow blowing (0,05-50oC/s) cooling. The advantage of this technology is significantly shorter duration of heat treatment compared with the treatment in the furnace cover.

Know the use of induction heating in lines for heat treatment of wire, for example in installations for induction heating wire [1 or 2].

The closest is essentially line for heat treatment of wire containing uncoiling, correct, heating, quenching, drawing and rolling facilities devices. Hardening the device consists of a dual chamber sprayer located before pulling the device, with the camera pre-cooling is equipped with nozzles for simultaneous supply of water and compressed air, and the camera rapid cooling - pipes for water supply. This line allows to obtain two-phase ferrite-martensite structure (DFS) in calibrated steel and manufacture of high-strength fasteners without the final heat strengthening [3].

The disadvantage of this equipment when it is used for spheroidizing and recrystallization annealing with partial phase recrystallization is the impossibility of providing treebook when receiving DFMS is the impossibility of providing a controlled two-stage cooling second stage with a high cooling rate.

The basis of the invention the task is to create an installation for spheroidizing annealing and quenching calibrated steel in coils, with high capacity, improved performance and providing good quality heat-treated steel.

The problem is solved by the fact that to allow for annealing and hardening on the same line, hardening device is designed as a single sprayer, when this unit is supplied with the unit slow cooling, made in the form of a cylindrical refractory-lined chamber with artificial heating and temperature control. To provide a fine structure with the goal of increasing range of consumer characteristics the plant is equipped with a block deformation, consisting of a die and properly-pushing device. To ensure trouble-free installation smachiwausa device implementation in the form of a block forming a coil and a two-position carousel. On the turntable off the carousel are two of the reeling drum, the rotational drive which has a device synchronization speed when winding and feeding speed steel.

- filler block deformation, 3 - right-pushing device block deformation, 4 - inductor, 5 - sprayer, 6 - cylinder lined Luggage slow cooling with the possibility of artificial heating and temperature control, 7 - smachiwausa device made in the form of a block forming a coil 8 and a two-position carousel 9, on the turntable which are winding drums 10, the rotational drive which has a device synchronization speed when winding and feeding speed steel 11. Block the formation of round 9 consists of rollers 12, 13, 14, and the axis of the rollers 12 and 13 is stationary and the roller 14 with adjusting screw-type mechanism 15 is placed on the slide, which is moved by the pneumatic cylinder 16. For pulling wire serves as a pressure roller 17 with the cylinder 18. The rotation of the winding drum 10 is carried out by the actuator 19 and the clutch 20, and the rotation-position carousel 9 - at the expense of the rotator 21.

The device operates as follows. With the unwinding device 1 rod passes through the die plate 2 on the right-pushing device 3, then passes through the inductor 4, where it is heated. Further, the rod comes in a cylindrical refractory-lined chamber slow allization - spheroidizing annealing the rod slowly cooled to a temperature of about 550oC, 5 sprayer when it is turned off. In the case of hardening of the MKI rod passes through the included sprayer 5 where it is cooled by water. Next, the rod is served on smachiwausa device 7 through the forming device rebellion 8, consisting of rollers 12, 13, 14. The axis of the rollers 12 and 13 is stationary. The roller 14 is placed on the slide, which is moved by the pneumatic cylinder 16. To obtain the radius of bending in connection with the use of this system for different diameters thermoablative steel roller 14 provided with an adjusting screw mechanism of the type 15. For pulling the end of the Bay is the roller 17, the team pressed by a pneumatic cylinder 18 to the roller 12. Winding drum receives the rotation position of the winding of the actuator 19, which is located on the bottom of the turntable. The rotation of the reeling drum 10 is transferred through the control sleeve 20. Synchronization of the wire feed speed and the rotation of the winding drums carried by the device sync speed when winding and feeding speed steel 11. Upon completion of the heat treatment of the first revolt dip carousel 9 through device 21 povorachivaetsa is in the position of receiving heat-treated steel moves free of the reeling drum.

The introduction of the proposed installation for spheroidizing annealing and quenching calibrated steel two-phase (ferrite-martensite structure will eliminate the low bell-type furnaces, currently used for annealing and hardening of steel before the cold by forging, will improve the quality of heat-treated steel and will significantly improve the conditions.

Sources of information

1. USSR author's certificate N 544686 class. C 21 D 1/12, 1974.

2. USSR author's certificate N 899674, class C 21 D 1/10, 1984.

3. Patent USSR N 1836453, class C 21 D 9/60, 1/10, 1993

Installation for spheroidizing annealing and quenching calibrated steel containing uncoiling, heating, quenching and rolling facilities device, wherein the installation is provided comprising a die and a pushing device block deformation and lined cylindrical chamber slow cooling with the possibility of artificial heating and temperature control, while the hardening device is designed as a single sprayer, and smachiwausa device is in the form of a block forming a coil and a two-position carousel, on the turntable which are the winding and feeding speed steel.

 

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