KR20020028924A - Heating apparatus for rolling a wire and rolling machine equipped the heating apparatus - Google Patents

Abstract

PURPOSE: A heating apparatus for rolling a wire rod enabling hot rolling by instantaneously heating a steel, iron or nonmetal wire rod is provided, and a rolling mill at which the heating apparatus is installed is provided. CONSTITUTION: The heating apparatus for rolling a wire rod comprises a transformer(10) transforming an input voltage into a required voltage; a positive electrode stand(20) which consists of an idling lower roller(22) installed at the lower side of the positive electrode stand(20), an upper roller(24) idled by a wire rod(1) passing through the lower roller(22) and the upper roller(24) facing the lower roller(22) and a cylinder(28) installed at the upper side of the positive electrode stand(20) so as to vertically move the upper roller(24) with the front part of a rod(26) of the cylinder(28) being connected to the upper roller(24), and which is electrically connected to the transformer(10); and a negative electrode stand(30) which is separated from the positive electrode stand(20) in a distance of the wire rod(1) to be heated and consisted of an idling lower roller(32) installed at the lower side of the negative electrode stand(30), an upper roller(34) idled by a wire rod(1) passing through the lower roller(32) and the upper roller(34) facing the lower roller(32) and a cylinder(38) installed at the upper side of the negative electrode stand(30) so as to vertically move the upper roller(34) with the front part of a rod(36) of the cylinder(38) being connected to the upper roller(34), and which is electrically connected to the transformer(10).

Description

HEATING APPARATUS FOR ROLLING A WIRE AND ROLLING MACHINE EQUIPPED THE HEATING APPARATUS}

The present invention relates to a heating apparatus for rolling a wire rod to enable hot rolling of steel, ferrous or non-ferrous material by instantaneous heating, and a rolling machine provided with the heating apparatus.

In general, in the rolling processing of wire rods, the cold rolling is referred to as cold working, and the heating and heating of the wire rod is referred to as hot working.

In the cold rolling process of wire rod, the surface roughness is improved and special equipment for heating the material is not needed. Therefore, when the wire diameter is small, the wire rod is mainly rolled by cold working.

However, in the cold rolling process, the formability is inferior to that of the hot rolling process, and it is difficult to roll a complex shape, so that the diameter of the wire rod is 1 inch or more, and the complicated shape is rolled or the rolling productivity is increased. Inevitably, hot rolling should be adopted.

On the other hand, in order to perform hot rolling, the wire needs to be heated. In the case of billet, the wire can be rolled after being heated in the furnace.However, when the rolling is performed while continuously unwinding the wire wound on the winding bobbin, There is no heating method, which is a problem.

The present invention has been made to solve the above problems, the object of the present invention is a simple equipment, without the use of equipment such as a heating furnace that can cause complex environmental problems, by simply heating the wire rod as a simple equipment It is to enable hot rolling.

In addition, another object of the present invention is to increase the formability and productivity of the wire rod by processing the wire rod by hot rolling, and to process the release wire of a complicated shape.

In addition, another object of the present invention is to simplify the structure of the hot rolling line by heating at the same time while continuously supplying the wire wound on the winding bobbin.

1 is a front view showing a heating apparatus according to an embodiment of the present invention.

2 is a right side view showing a heating apparatus according to an embodiment of the present invention.

Figure 3 is a block diagram of the upper and lower roller cooling apparatus according to an embodiment of the present invention.

Figure 4 is a block diagram showing the SCR control of the heating apparatus according to an embodiment of the present invention.

Figure 5 is a front view showing one embodiment of a two-stage rolling mill equipped with a heating apparatus of the present invention.

Figure 6 is a right side view showing one embodiment of a two-stage rolling mill equipped with a heating apparatus of the present invention.

Figure 7 is a front view showing that the rolling stand of the rolling mill is used as an electrode stand in accordance with another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

DESCRIPTION OF SYMBOLS 1 Wire 10 Transformer 12 Busbar 20 Positive electrode stand 22, 32 Lower roller 24, 34 Upper roller 26, 36 Rod 28, 38 Cylinder 30 Electrode stand 40 Calibration part 42: lower guide roller 44: upper guide roller 50: coolant tank 74: thyristor gate circuit 80, 90: motor 82,92: reducer 84: universal joint 86: lower roll 88: upper roll 94: driven gear 96: drive gear 98 Screw 100: Block

The present invention provides a transformer for converting an input voltage into a required voltage; A lower roller which is idling at the lower side, and an upper roller which is idling by the wire rod which passes between the lower rollers, and the end of the rod is coupled to the upper roller to move the upper roller up and down. A positive electrode stand provided above and electrically connected to the transformer; The positive electrode stand is spaced apart by the distance of the wire to be heated, and provided with a lower roller to be idle on the lower side, and has an upper roller idling by the wire passing through the lower roller facing each other, the upper portion The front end of the rod coupled to the roller is provided with a cylinder for moving the upper roller up and down, and comprises a (-) electrode stand electrically connected to the transformer.

Positioned between the (+) electrode stand and the (-) electrode stand is heated and further includes a straightening portion having an upper guide roller on the upper side and a lower guide roller on the lower side to straighten the wire passing through.

The present invention is characterized in that the cooling water line is installed in the upper roller and the lower roller for cooling the upper roller and the lower roller.

The present invention is characterized by varying the current value flowing in the wire by the thyristor gate control by the control of the passive volume with a variable resistor in order to change the heating temperature according to the thickness and material of the wire.

The present invention comprises a motor adjacent to the transfer direction of the wire rod from the heating device; A reducer for reducing the power of the motor; A universal joint for transmitting power from the speed reducer; An upper roller and a lower roller each rotating with a driving force by the power transmitted from the universal joint; It further comprises a rolling mill composed of shanghai conveying means for transporting the upper roller up and down.

The shanghai conveying means includes a block surrounding both ends of the upper roller; A screw screwed to the block and idling in place; A driven gear installed at the end of the screw; A drive gear meshed with the driven gear; A reducer coupled to the shaft of the drive gear; It is characterized by consisting of a motor for transmitting power by the belt to the reducer.

In addition, the present invention provides a transformer for converting an input voltage into a required voltage; A lower roller which is idling at the lower side, and an upper roller which is idling by the wire rod which passes between the lower rollers, and the end of the rod is coupled to the upper roller to move the upper roller up and down. A positive electrode stand provided above and electrically connected to the transformer; Shanghai conveying means for transporting the upper roller up and down, and having the upper roller and the lower roller up and down respectively receiving the power from the gear reducer to reduce the power of the motor from the universal joint and having the driving force by the power of the motor. It includes a (-) electrode stand consisting of a rolling stand provided on the upper side of the upper roller.

Hereinafter, with reference to the exemplary drawings will be described in detail a preferred embodiment of the present invention.

1 is a front view showing a heating apparatus according to an embodiment of the present invention, Figure 2 is a right side view showing a heating apparatus according to an embodiment of the present invention, Figure 3 is a heating apparatus according to an embodiment of the present invention Figure 4 is a block diagram of a cooler for cooling the upper and lower rollers of Figure 4 is a block diagram showing the SCR control of the heating apparatus according to an embodiment of the present invention, Figure 5 is a work of a two-stage rolling mill equipped with the heating apparatus of the present invention 6 is a right side view showing an embodiment of a two-stage rolling mill equipped with a heating apparatus of the present invention, and FIG. 7 is a rolling stand of the rolling mill used as an electrode stand according to another embodiment of the present invention. It is the front view which shows that.

1 and 2, a transformer 10 for converting an input voltage into a required voltage is provided. The transformer 10 has a voltage of 380 V on the primary side, a voltage of 12 V on the secondary side, and a current of 80,000 to 140,000 A flows on the secondary side.

The power supply of the transformer 10 is connected to the (+) (-) electrode stand 20, 30 which is located on both sides of the transformer 10 by the bus bar 12 or a wire.

The (+) electrode stand 20 is to electrically connect the (+) power to the wire rod (1), the (-) electrode stand 30 is to electrically connect the (-) power to the wire rod (1) The transformer 10, the (+) electrode stand 20 and the (-) electrode stand 30, and the wire rod (1) located therebetween are electrically closed circuits and the resistance of the wire rod (1) Heating is performed by the value and the current value flowing between the wire rod.

In the winding bobbin (not shown) winding the wire rod 1 as a failure, the wire rod 1 is continuously released by the driving force of the rolling mill, which will be described later, with the positive electrode stand 20 and the negative electrode stand. The wire rod 1 between 30 is heated.

The (+) electrode stand 20 guides the wire rod 1 from the lower side while idling in place, and has a lower roller 22 having a sheave-like shape at the lower side thereof, and the lower roller 22. The upper roller 24 having a shape such as a sheave and guides the wire rod 1 from the upper side while idling in position and facing the cylinder, and the cylinder 28 above the upper roller 24. The rods 26 are coupled so that the cylinder 28 is operated so that the upper roller 24 is moved up and down by the rods 26.

The lower roller 22 and the upper roller 24 function as an electrode, and when the wire rod 1 moves on the lower roller 22, the upper roller 24 moves downward to move the wire rod ( When 1) is pressurized, positive (+) power is induced to the wire rod 1 stably.

The (-) electrode stand 30 is located in a position symmetrical with the (+) electrode stand 20 around the transformer 10, the structure is the same.

That is, the (-) electrode stand 30 guides the wire rod 1 from the lower side while idling in place, and has a lower roller 32 having a shape like a sheave on the lower side thereof, and the lower roller ( 32 and the upper roller 34 having a shape like a sheave and guide the wire rod 1 from the upper side while idling in place and having a cylinder (on the upper side of the upper roller 34). The rod 36 of 38 is coupled so that the cylinder 38 is operated so that the upper roller 34 is moved up and down by the rod 36.

Although the cylinder 38 is shown to be pneumatic, it may be hydraulic.

The lower roller 32 and the upper roller 34 functions as an electrode, and when the wire rod 1 moves on the lower roller 32, the lower roller 32 moves the upper roller 34 downward so that the wire rod ( When 1) is pressurized, (-) power is stably induced to the wire rod 1.

As shown in FIG. 3, the lower rollers 22 and 32 and the upper rollers 24 and 34 of the (+) (-) electrode stands 20 and 30 are connected to the wire 1 to be heated. Due to heat transfer, the lower rollers 22 and 32 and the upper rollers 24 and 34 must be circulated to cool the cooling water. The cooling water of the cooling water tank 50 containing the cooling water is circulated. The pump 52 rotates and cools the lower rollers 22 and 32 and the upper rollers 24 and 34.

On the other hand, the cooling water tank 50 is provided with an evaporator 54 is compressed by the compressor 56, the refrigerant condensed in the condenser 58 passes through the dryer 60 in the expansion valve 62 The cooling water of the cooling water tank 50 is cooled by being expanded and heat exchanged in the evaporator 54.

Of course, the cooling water may be circulated and then cooled using a freezer as described above, but after the cooling water is circulated through the lower rollers 22 and 32 and the upper rollers 24 and 34, the cooling water is used as it is. Alternatively, the cooling water tank 50 may be enlarged and circulated to cool the used cooling water by air cooling.

In Fig. 4, the thyristor (SCR) gate circuit 74 is provided with a passive volume which is adjusted by a variable resistor. When the passive volume is adjusted according to the thickness or material of the wire to be heated, the thyristor 76 is controlled. As a result, the current flowing through the wire rod 1 on the secondary side of the transformer 10 changes, and the wire rod 1 is heated.

In addition, the CPU 70 is set in advance to a value suitable for the thickness and material of the wire 1 to be rolled in advance, and then continuously through the digital / analog converter 72 to automatically adjust the difference against the actual value. By inputting the thyristor gate circuit 74, the current value flowing through the wire rod 1 can be automatically controlled.

5 and 6 show a two-stage rolling mill having two rolling stands, and the two-stage rolling mill is immediately adjacent to the heating apparatus so that the wire rod 1 heated from the heating apparatus can be directly hot rolled. Is located.

Each rolling stand of the two-stage rolling mill has the same configuration, and each rolling stand is also provided continuously, and the rolling stand is divided into one, two, three, and four according to the shape, thickness, and material of the wire rod to be rolled. It can be any one of the stages, the rolling rolls of the rolling stand of each stage may also have two top and bottom, there may be two left and right, and the rolling rolls are four (four) or six (6) It may be in.

The rolling stand is provided with a motor 80 on one side of the frame, the reducer 82 is coupled to the motor 80, two shafts are provided up and down from the reducer 82 to each shaft The universal joint 84 is connected to each of the universal joint 84, the lower roll 86 and the upper roll 88 are coupled to each other to rotate with a driving force under the power of the motor.

As shown in FIG. 6, the upper roll 88 has a structure capable of moving up and down. A motor 90 is installed above the upper roll 88, and the power of the motor 90 is It is transmitted to the drive gear 94 provided in the lower end of the reducer 92 via the reducer 92, The driven gear 96 is meshed with both sides of the drive gear 94, The axis of the driven gear 96 is The screw 98 is configured to rotate in place, and the screw 98 is screwed to the block 100 surrounding both ends of the upper roll 88, so that the screw 98 is rotated by the motor 90. ) Is to be idling in place to transfer the upper roll 88 up and down.

Although not shown, it is preferable that the release wire 1 which is rolled by the above-mentioned rolling mill is cut to the required length by a saw cutter installed after the rolling mill and installed so as to be able to move forward and backward.

7 shows an embodiment in which the rolling stand itself is used as one electrode stand, which is different from the above embodiment in that the rolling stand is used as the electrode stand instead of the negative electrode stand 30 to immediately roll. Can be.

A negative electrode is applied to the lower roll 86 and the upper roll 88 from the transformer 10 so that the lower roll 86 and the upper roll 88 function as electrodes, and the negative electrode It is preferable to insulate the lower roll 86 and the upper roll 88 to be used as, and when the insulation is difficult in part, the whole rolling stand may be insulated.

Of course, in the above embodiment, the left side is used as the (+) electrode stand and the right side is used as the (-) electrode stand, but this may be reversed.

5 to 7, a cooling nozzle 102 is provided around the lower roll 86 and the upper roll 88, and the cooling nozzle 102 may be sprayed with oil such as rolling oil. For example, it can spray water such as cooling water.

As described above, embodiments of the present invention have been described in detail, but the scope of the present invention is not limited thereto, and the scope of the present invention extends to the range substantially equivalent to one embodiment of the present invention.

According to the present invention, since the equipment is complicated and the wire rod can be heated simply and instantaneously without using equipment such as a heating furnace which may cause environmental problems, the equipment for hot rolling is simplified.

In addition, according to the present invention, since the wire rod can be processed by hot rolling, the formability and productivity of the wire rod are increased, and there is an effect that the release wire rod having a complicated shape can be processed relatively easily.

In addition, according to the present invention, since the wire rod wound on the winding bobbin can be continuously supplied and simultaneously heated, the overall structure of the hot rolling line can be simplified.

Further, according to the present invention, since the wire can be rolled at the same time as the heating of the wire rod, the efficiency of the equipment is doubled and the productivity is improved.

Claims (10)

A transformer for converting an input voltage into a required voltage; A lower roller which is idling at the lower side, and an upper roller which is idling by the wire rod which passes between the lower rollers, and the end of the rod is coupled to the upper roller to move the upper roller up and down. A positive electrode stand provided above and electrically connected to the transformer; The positive electrode stand is spaced apart by the distance of the wire to be heated, and provided with a lower roller to be idle on the lower side, and has an upper roller idling by the wire passing through the lower roller facing each other, the upper portion The upper end of the rod coupled to the roller is provided with a cylinder for moving the upper roller up and down, the heating device for a wire rod rolling comprising a (-) electrode stand electrically connected to the transformer. The method of claim 1, The wire rod further comprises a straightening part having an upper guide roller on the upper side and a lower guide roller on the lower side so as to be straightened and heated between the (+) electrode stand and the (-) electrode stand. Heating device for The method according to claim 1 and 2, Heating device for the wire rod rolling, characterized in that the cooling water line is installed in the upper roller and the lower roller for cooling the upper roller and the lower roller. The method of claim 1, And a thyristor gate control by controlling a passive volume having a variable resistor to change the heating temperature according to the thickness and the material of the wire, thereby changing a current value flowing in the wire. The method of claim 1, A motor adjacent from the heating device in a conveying direction of the wire rod; A reducer for reducing the power of the motor; A universal joint for transmitting power from the speed reducer; Upper and lower rolls each having a driving force and being rotated by the power transmitted from the universal joint; The rolling mill is provided with a heating device for rolling the wire rod further comprises a rolling stand composed of a shanghai conveying means for conveying the upper roll up and down. The method of claim 5, The rolling mill is provided with a heating device for rolling the wire rod, characterized in that the rolling roll of the rolling stand is installed on four or six sides. The method of claim 5, The rolling mill is provided with a heating device for rolling the wire rod, characterized in that one of two stages, three stages, four stages are continuously installed. The method according to any one of claims 5 to 7, And a sawing cutter for cutting a release wire which is rolled after the rolling stand. The method of claim 5, The shanghai conveying means comprises a block surrounding both ends of the upper roll; A screw screwed to the block and idling in place; A driven gear installed at the end of the screw; A drive gear meshed with the driven gear; A reducer coupled to the shaft of the drive gear; A rolling mill is provided with a heating device for wire rod rolling, characterized in that the motor is configured to transmit power by a belt to the reducer. A transformer for converting an input voltage into a required voltage; A lower roller which is idling at the lower side, and an upper roller which is idling by the wire rod which passes between the lower rollers, and the end of the rod is coupled to the upper roller to move the upper roller up and down. A positive electrode stand provided above and electrically connected to the transformer; Shanghai conveying means for receiving the power from the reducer that decelerates the power of the motor from the universal joint, and having the upper and lower rolls rotating up and down respectively with the driving force by the power of the motor, and transferring the upper roll up and down. The rolling mill is provided with a heating device for wire rod rolling comprising a (-) electrode stand consisting of a rolling stand provided on the upper side of the upper roll.