SU1291613A1 - Set for heat treatment of steel wire - Google Patents

Abstract

The invention relates to the heat treatment of wire, mainly low-alloyed, by air sorbitization and can be used in thermal shops and branches of steel wire-wire plants. The aim of the invention is to increase the productivity of the unit. Before starting the operation, the furnace 2 and the thermostat 5 are heated, and the platform 4 and the thermostat 5 are installed in a certain position. The processed wire from the unwinding device 1 is passed through the furnace 2 and the shaper 13, which forms a compact bundle of heated wires, in which the heat sink drastically slows down, i.e. temperature stabilized. A bundle of heated wires passes around the deformer 15 in the form of at least one vertically installed roller, where the wire bends and receives a deformation of 5-30%, which accelerates the process of decomposition of supercooled austenite, which begins after the beam is removed from the deformer and divided into separate wires. locks behind the shaper 14. By the end of the wire coming off the platform 4, up to 25% of the supercooled austenite disintegrates in it. The last 25% of the cooled austenite disintegrate as the wire moves through the thermostat 5, in which a constant temperature is maintained. The heat-treated wire is wound with a winding device 7. The increase in productivity is achieved by accelerating the decomposition of the supercooled. austenite by creating tension in an austenitized wire assembled in a bundle by a deformer without changing the shape of the cross section and the size of a single wire. 2 hp f-ly, 4 ill. (L O) with -4f-ff -If- 4f s lie if 14 yy 0 Fig / 1t

Description

The invention relates to hardware manufacturing, and more specifically to the heat treatment of steel wire, mainly low alloyed, by air sorbitization and can be used in heat shops and branches of steel wire rope plants.

The aim of the invention is to increase productivity, simplify the design of the unit.

Fig. 1 is a schematic diagram of a unit for the heat treatment of steel wire; Fig. 2 shows a mobile platform with shapers and a wire to be processed, top view; on fig.Z - section aa on figure 2; figure 4 - view B in fig.Z.

The unit for heat treatment of steel wire contains a unwinding device (figures) 1, a heating furnace 2 with an outlet part 3, a platform 4 and a thermostat 5 with lugs 6, a winding device (drums) 7 with a drive (figure 1). The platform 4 and the thermostat 5 are mounted on the rollers 8, laid in the grooves of the guides 9, arranged parallel to the longitudinal axis of the unit. Platform 4 and thermostat 5 can be fixed in selected places by latches 10. Platform 4 is equipped with dies 11 and 12, formers 13, 14 and deformer 15 with the possibility of its rotation around axis 16 (Fig. 2). The former consists of fixed plates 17 and movable plates 18 connected by a hinge 19 (FIG. 3). The fixed and movable plates 17 and 18 contain figured vices 20 (FIG. 4), whereby when moving the movable plates 18, the cross-sectional area between the fixed and movable plates 17 and 18 can be changed, and, therefore, the required density is achieved bundle of wires 21. The outer surface of the deformer 15 and the inner surfaces of the plates 17 and 18 of the formers 13 and 14 are made of low heat-conducting material, for example, of austenitic steel.

The unit for the heat treatment of steel wire, mainly by air sorbitisation of low alloy steel wire, works as follows.

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Starting from the decay kinetics of supercooled austenite in a low-alloyed wire of a specific chemical composition and diameter, the platform 4 and the thermostat 5 are set to a certain position. Their installation is carried out by moving the crane along the longitudinal axis of the unit to the eyes 6. and the thermostat is moved on the rollers 8, laid into the grooves of the guides 9; their position can be locked with latches 10.

During operation, the temperature in the zones of the heating furnace may vary, and therefore the temperature of the wire will change before patenting, therefore, the platform and thermostat must be moved during the processing of the wire of the same size and chemical composition. For this, the following system can be used, allowing the platform and thermostat to be moved simultaneously with the change in temperature.

The position of the platform with the formers and the deformer is chosen from the condition of disintegration at the descent from the platform to 25% of austenite, and the position of the thermostat from the condition of disintegration in it of the last 25% of supercooled austenite. This is necessary to maintain a constant decomposition temperature for supercooled austenite and to obtain homogeneous decomposition products.

Then the heating furnace 2 and thermostat 5 are heated to the set temperatures. The coils with low-alloyed wire intended for heat treatment are mounted on the unwinding device 1. The ends of the wires are passed through the heating furnace 2, the comb 11, the former 13. Thanks to the shaped cutouts 20 on the plates 17, 18 and the hinge in the former 13, a compact beam of heated wires 21, which enclose a deformer 15 as a free loop, in quality of which at least one roller with a vertical axis of rotation 16 can serve. In order to better fix the position of the loop during movement, the roller may contain a stream. The diameter of the roller at the bottom of the stream is 5–20 times the diameter of the wire to be processed. Next, the bundle of wires is passed through the shaper 14 and the comb

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12, by which the wire bundle is disbanded and the wires again occupy an individual position. Then the ends of the wires are fixed on the drums of the coiler 7.

When the drums of the winding device 7 are driven from the drives, the wire is continuously pulled through the heating furnace 2 and due to the individual position of each wire in the furnace and the continuous change of contact points, the wire is evenly heated to the austenitic state. A part of the scale formed during heating on the wire surface accumulates in the output part 3 of the heating furnace 2. Upon further movement, the wire passes the comb 11, begins to cool in air and is bent further, due to which additional scale is removed from the wire surface, then the wire is formed into a compact beam in the former 13. An increase in the wire mass dramatically slows down the heat sink, i.e. temperature stabilized. The outer wires of the beam are not cooled when in contact with the inner surfaces of the plates 17 and 18, since they are made of low heat-conducting austenitic steel.

Upon further movement, the compact wire bundle bends into a loop around the deformer 15 - a roller with a diameter of 5–20 times the diameter of the wire to be processed, while the outer and inner fibers of each of the beam wires experience relative deformations (5-30%), but the shape and diameter of the cross section the wires do not change. Such deformation significantly speeds up the process of decomposition of supercooled austenite, which begins after the beam leaves the roller and separates it into separate wires behind the shape former 14. By the end of the gathering, the wires from platform 4 in the wires dissolve to 25% of supercooled austenite. In the future, the wire moves in air until 75% of the supercooled austenite disintegrates, while there is no noticeable decrease in the wire temperature due to the heat sink from the free surface of the wire, since 25-75% of the supercooled austenite decay is intensely absorbed.

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of these transformations, compensating for heat removal from the free surface. The last 25% of the supercooled austenite disintegrate when the wire moves in the thermostat 5, in which the temperature is kept constant, since during cooling in free air the temperature of the wire would decrease due to the prevalence of heat from the free surface over the amount of heat from the phase transformations of the remaining austenite. The heat treated wire is thus wound onto the drums of the coiler 1.

When switching to heat treatment of wire of different diameter and chemical composition, the operations are carried out in the described sequence.

The use of the proposed unit for heat treatment of steel wire, mainly air, by sorbitisation of low alloy steel wire, improves productivity by accelerating the decomposition of supercooled austenite by creating stresses in the austenitized wire with a deformer without changing the cross-sectional shape and size of a single wire, eliminating the first the movement of the wire thermostat and, consequently, simplify the design and increase efficiency by reducing energy consumption t. The expected increase in productivity in the sorbitization of low-alloyed steel wire with 1-2% manganese, silicon and other elements is 120-150% relative to the treatment on a known aggregate; reduction of energy consumption - by 10-20%. Since the deformer is installed at some distance from the outlet of the heating furnace and, moreover, it can be moved, it is provided with quick access for descaling, maintenance, etc., which is convenient during operation. When bending, the wire is mechanically cleaned from scale, which reduces preparatory operations for drawing. Ropes of low-alloyed wire have higher performance.

Claims (3)

1. An apparatus for the heat treatment of steel wire containing an unwinding device, a heating furnace, a thermostat capable of reciprocating along the axis of the unit and a winding device that differs from the fact that, in order to increase productivity, simplify the design of the unit, it is equipped with a platform installed behind the heating furnace 0 formers and a deformer located between them; the platform is complete with the possibility 12916136 reciprocating movement along the longitudinal axis of the aggregate. 2. A unit of pop, 1, characterized in that the deformer is made in the form of at least one vertically mounted roller. , 3. The aggregate pop. 1, which differs from the fact that the former is made in the form of L-shaped plates that form a square, while one of the plates has the ability to move relative to the other. , 3. The aggregate pop. 1, which differs from the fact that the former is made in the form of L-shaped plates that form a square, while one of the plates has the ability to move relative to the other. 21, 19 (Rig.2 Move plug-in rules 12 Moving probol / ha 18 NJ 77 / 17 / 9i, 2.5 Compiled by N. Kuzovkina Editor N. Egorov Tehred M. Khodanich Proofreader A. Ilyin Order 205/29 Circulation 550 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 P P 20 9ag.