JP6184351B2 - Steel wire rod transport method - Google Patents

Description

  The present invention relates to a method for transporting a bar steel wire in a rolling line of the bar steel wire, and particularly corrects the transport posture of the bar steel wire in a transport unit that transports the bar steel wire wound by a laying head (winding machine). Regarding the method.

  Conventionally, in the rolling line that continuously manufactures billets and other slabs to produce bar wire, from the upstream side, heating furnace, rough rolling mill, finishing rolling mill, laying head (winding machine), conveying section, stacking The devices are arranged in order. The slab is heated in a heating furnace and continuously rolled, and then becomes a bar wire. Thereafter, the strip wire is formed into a spiral shape by the laying head, conveyed downstream by the conveying unit, and wound in a coil shape around the axial center (vertical direction) facing the vertical direction by the accumulator.

  With respect to the coil wire wound up by this integrated device, there may be a case where the packing appearance defect such as the winding pitch is not constant. One of the causes of this defective package appearance is that the inter-wire pitch (hereinafter, also referred to as ring pitch) of the strip wire that has been spiraled in the transport section is not constant. The ring pitch is easily affected by rolling tension, laying head vibration, and the like. Particularly, in multi-series rolling, the ring pitch after rolling tends to be non-uniform because it is affected by other than the series.

For example, when hot steel comes off at any of the rolling stands in four rows when rolling in four rows, the line speed changes because the hot steel cross-sectional dimensions of the first to third rows vary due to rolling load fluctuations, The discharge power of the laying head provided in each row changes. Under such circumstances, the non-uniformity of the ring pitch in the transport unit becomes significant.
For this reason, it is desired to make the ring posture uniform in multi-series rolling, in which there are many disturbances and the ring posture tends to be non-uniform.

As a technique for solving such inconvenience, there is one disclosed in Patent Document 1.
Patent Document 1 is a wire ring transport device that transports a wire ring that is spirally developed after rolling on a conveyor, and is disposed above the conveyor and orthogonal to the transport direction of the conveyor. A rotating shaft, one or more presser disks that press the wire rod inserted and fixed to the rotating shaft and conveyed on the conveyor from above, and a rotating shaft drive unit coupled to the rotating shaft. A wire ring conveying device provided with a wire ring presser mechanism is disclosed.

Japanese Patent Application No. 2006-335499

The technique of Patent Document 1 is to provide a ring pressing mechanism to keep the falling posture horizontal and improve the coil wire packing, but it cannot be sufficiently improved when the ring pitch is uneven. It has become clear as a track record.
Therefore, in view of the above-mentioned problems, the present invention makes the ring pitch of the steel wires placed in a spiral shape in the conveying section of the steel wire rolling line constant, and the packing state of the steel wires made into a coil shape in the accumulation device It aims at providing the conveyance method of the strip steel wire which can suppress a defect as much as possible.

In order to achieve the above-described object, the present invention takes the following technical means.
The method for transporting the bar wire according to the present invention relates to a transport unit that is provided in a rolling line of the bar steel wire and that transports the bar wire wound in a spiral shape by a laying head, and a transport device provided in the transport unit. Is divided into a plurality of sections, and the divided sections can be individually driven, and the wire rod is rolled while the conveying speed of each section of the conveying device is individually controlled, and the rolled steel bar The wire rod is transported downstream , placed on the transport device in a spiral shape, and the ring pitch of the steel wire rod transported downstream is measured to detect the section where the non-uniform ring pitch exists. The conveyance speed of the downstream section adjacent to the detected section is changed .

Good Mashiku is Oite to one section, to measure the pitch P1 of the long steel wire placed on the spiral which is being conveyed at the conveying speed V, the measured of long products wire pitch P1 is given if turned small dense state than the value, is accelerated to the transport speed of the adjacent and downstream near Ru another section to the one section of the measurement of the ring pitch P1, long products wires the measured of if the pitch P1 is sufficient that large sparse state than a predetermined value, thereby decelerating the conveying speed of the other sections in adjacent and downstream to the one section of the measurement of the ring pitch P1, the Oite to another section located downstream Ri by another section, the measured ring pitch P2 of the long product wire, if the measured ring pitch P2 is within a predetermined condition, the other section the conveying speed of the You may return to the original.

  According to the method for transporting the bar wire according to the present invention, the packing state of the bar wire that is coiled in the accumulating device, with the ring pitch of the bar wire placed spirally in the transport section of the rolling line of the bar wire being constant. Defects can be suppressed as much as possible.

It is a schematic diagram of the rolling line of a strip steel wire. It is the figure which showed the conveyance part with which the rolling line was equipped. It is a flowchart which shows the conveyance method of the bar wire which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, embodiment described below is an example which actualized this invention, Comprising: It is not for limiting the structure of this invention only to the specific example. Therefore, the technical scope of the present invention is not limited only to the disclosed contents of the present embodiment.
First, the rolling line to which the method for transporting the strip wire according to the present embodiment is applied will be described.

FIG. 1 shows an outline of a rolling line 1 for rolling the strip wire W. In this rolling line 1, a heating furnace 2, a rough rolling mill 3, a middle row rolling mill 4, a finishing rolling mill 5, a winding roll for heating a slab such as a billet in order from the upstream side to the downstream side in the material conveying direction. The take-up machines 6 (laying heads) are arranged in order.
Further, a plurality of cooling means 7 for cooling the strip wire W is provided between the finish rolling mill 5 and the laying head 6, and the wound strip wire W is wound further downstream on the exit side of the laying head 6. A conveying device 8 (conveying unit) is provided.

  In this rolling line 1, the slab heated in the heating furnace 2 is roughly rolled by passing through a rough rolling mill 3 and an intermediate row rolling mill 4, and then passed through a finishing rolling mill 5 to obtain a predetermined cross-sectional shape, It is rolled and formed into a strip steel wire W having a diameter. The rolled wire rod W is cooled by the cooling means 7, wound into a ring shape by the laying head 6, and conveyed downstream by the conveying device 8.

  As shown in FIG. 1, a stacking device 12 is arranged on the terminal side of the transport device 8 (conveyor), and the strip wire W that has flowed through the transport device 8 is loaded into the stacking device 12. The loaded strip wire W is wound into a coil shape, and its axis is directed in the vertical direction. That is, the strip wire W that has been transported spirally by the transport device 8 is loaded into the stacking device 12 as a coil wire that is oriented vertically.

In the transport device 8 described above, the strip wire W is in a state in which rings are connected on the conveyor (spiral state) due to the relationship between the unwinding speed of the strip wire W unwound from the laying head 6 and the transport speed of the transport device 8. ), The strip wire W is cooled while being transported, falls to the stacking device 12 at the terminal portion of the transport device 8, and is bundled in a coil shape.
Here, at the time of unwinding, by receiving the rolling tension and the vibration of the laying head 6, the interval (ring pitch P) of the rings overlapped in the transport direction on the transport device 8 is not constant, and the overlapping portions of the rings are There are portions that become dense or rough due to the large overlap between rings.

When the strip wire W in such a state is conveyed as it is and dropped onto the accumulating device 12, a good ring shape cannot be maintained in the accumulating device 12, and the coil wire material packing state will be poor.
Therefore, the applicants of the present application have focused on the ring pitch P in the transport direction and have come to the idea of making the ring pitch P uniform by partially changing the transport speed V on the transport device 8.
That is, as shown in FIG. 2, the transport device 8 of the present embodiment is divided into a plurality of section portions 8 </ b> A to 8 </ b> E in the longitudinal direction (the direction in which the strip wire W is transferred). Each of the section portions 8A to 8E employs a conveyor type in which a conveyor belt 10 for transportation is bridged between conveyor rolls 9 arranged on both sides in the longitudinal direction. By transporting to the downstream side, the bar wire W placed on the conveyor belt 10 is conveyed from the upstream side to the downstream side.

In addition, as a drive system of section part 8A-8E, various conveyance systems, such as a roller system and a chain system, are also employable. Each section part 8A-8E can control the conveyance speed V separately.
For example, the strip wire W transferred to the downstream side by a certain section portion 8A is transferred to the next section portion 8B adjacent to the downstream side of the section portion 8A, and then the upper side of the next section portion 8B from the upstream side. Transfer downstream.

The conveying device 8 is composed of a plurality of (for example, five) section portions, and the steel wire W placed on the first section portion 8A located on the most upstream side is the second section portions 8B to 4th. It is conveyed to the section portion 8D, moves to the fifth section portion 8E located on the most downstream side, and is finally conveyed to the stacking device 12.
By performing the control as shown in FIG. 3 in the transfer device 8 described above, the ring pitch P in the transfer unit 8 of the rolling line 1 is made constant, and the packing shape defect of the strip wire W that is coiled in the stacking device 12. Can be suppressed as much as possible.

First, as shown in FIG. 2, the transport device 8 includes five section portions, a second section portion (second section portion 8B) from the upstream side, and a fourth section portion (second section portion from the upstream side ( The imaging means 11 (camera) is installed in the fourth section portion 8D).
The camera 11 picks up the coiled wire rod W (ring wire) conveyed from the conveying device 8 from above, and performs image processing (such as binarization) by those skilled in the art to obtain a ring pitch. P can be measured. The ring pitch P may be obtained by observing the operator visually.

Control of the transport device 8 is performed based on such a device configuration.
First, based on the image obtained with the camera 11 arranged above the conveying device 8, the ring pitch P of the spiral wire rod W is measured.
For example, as shown in FIG. 2, the ring pitch P is measured based on an image obtained by a camera 11B arranged above the second section portion 8B. When the non-uniform ring pitch P is detected as a result of the measurement, the conveyance speed V of the third section 8C next to the second section 8B where the ring pitch P is measured is changed, and the speed is adjusted to an appropriate range. .

For example, when the ring pitch P of the second section portion 8B becomes dense, the conveyance speed V of the next third section portion 8C following the second section portion 8B is increased. On the contrary, when the ring pitch P of a certain second section portion 8B becomes sparse, the transport speed V of the next third section portion 8C following the second section portion 8B is decreased.
By such adjustment of the conveyance speed V, a speed difference between the section portions 8B and 8C following the front and rear is generated, the ring pitch P becomes variable, and the adjustment becomes possible. The non-uniform ring pitch P is more than 0.1 × ring diameter ± 15% of the ring pitch P. Beyond this range, it has been empirically known that a good package cannot be obtained within the stacking device 12.

The technique of the present invention is intended to uniformly cool or gradually cool the entire coil wire W as disclosed in Japanese Patent Application Laid-Open No. 2002-205110 and Japanese Patent No. 3550521. It is a very different technology from the one that adjusts the speed.
Next, the details of the processing of the present invention will be described with reference to FIGS.
First, in S1, the pitch (ring pitch P1) of the wire rod W placed in a spiral shape being conveyed at the conveyance speed V is measured by the camera 11B installed above the second section portion 8B.

Thereafter, in S2, it is determined whether or not the ring pitch P1 is within a predetermined range (allowable range, for example, A <P1 <B). If not, the process proceeds to S3. If it is within the predetermined range, the process returns to S1.
In S3, if the ring pitch P1 is negative, that is, it is dense, the downstream section (third section 8C) adjacent to the section (second section 8B) where the ring pitch P1 was measured is measured. The conveyance speed is increased from V to V ′.

On the other hand, if the ring pitch P1 is positive, that is, sparse, the conveyance speed of the downstream section (third section 8C) adjacent to the section (second section 8B) where the ring pitch P1 is measured. Is decelerated from V to V ′.
Thereafter, in S4, the ring pitch P2 of the wire in the fourth section portion 8D is measured by the camera 11D installed above the fourth section portion 8D, and the ring pitch P2 is within a predetermined condition (for example, A < If P2 <B), the conveyance speed of the third section 8C is returned from V ′ to V and conveyed.

In S5, if the ring pitch P2 is not within the predetermined condition, the transport speed of the section portion (fifth section portion 8E) following the section portion (fourth section portion 8D) where the ring pitch P2 is measured is set to V. To V '.
The above process is repeated until the ring pitch P2 is within an appropriate range.
In this manner, the strip wire W having the ring pitch P appropriately adjusted becomes a good coil wire W (coil wire W having a good packing shape) in the stacking device 12 after conveyance.
[Example]
A case where the above processing is actually applied will be described below.

First, 160 square billets were rolled in four lines with 30 rolling mills, and an experiment was conducted in an example in which a product of φ5.5 was formed into a ring shape by a laying head 6 (winding machine). .
The conveying device 8 that conveys the strip-shaped wire rod W having a ring shape has a total length of 50 m and is configured of five section portions 8A to 8E. Each section 8A-8E is driven by an independent motor so that the speed can be set.

The initial value V of the conveying speed of each section 8A to 8E is uniformly 1 m / sec, and above the second section 8B of the conveying device 8 so that the ring pitch is 50 mm ± 5 mm with respect to the ring diameter of 1200 mm. Images were taken with the installed camera 11B.
Image processing (in this example, CV-3000 made by Keyence) was performed on the captured image, and the ring pitch P1 was calculated. If a portion other than 50 mm ± 5 mm is detected with respect to the calculated ring pitch P1, for example, the conveyance speed of the third section portion 8C is changed from V to V ′ (= V0 ± 10% range), and the ring pitch is changed. Correct P1 uniformly.

Thereafter, the ring pitch P2 is measured using the camera 11D disposed above the fourth section portion 8D. If the ring pitch P2 is 50 mm ± 5 mm, the speed of the third section portion 8C having the changed speed is obtained. V ′ was returned to V.
By performing the above-described processing, the ring pitch P in the conveying section of the rolling line 1 for manufacturing the strip wire W is made constant, and the packing state defect of the strip wire W that is coiled in the accumulator 12 is suppressed as much as possible. Applicants have confirmed that this is the case.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.

DESCRIPTION OF SYMBOLS 1 Rolling line 2 Heating furnace 3 Rough rolling mill 4 Intermediate row rolling mill 5 Finish rolling mill 6 Winding machine (laying head)
7 Cooling means 8 Conveying device (conveying unit, conveyor)
8A 1st section part 8B 2nd section part 8C 3rd section part 8D 4th section part 8E 5th section part 9 Conveyance roll 10 Conveyor belt 11 Imaging means (camera)
11B camera (second section)
11D camera (4th section)
12 Accumulator W-steel wire (coil wire)

Claims (2)

Concerning a transport section that is provided in a rolling line of the strip steel wire, and the strip wire wound in a spiral shape by the laying head is transported,
While dividing the conveying device provided in the conveying unit into a plurality of sections, the divided sections can be individually driven,
While individually controlling the conveying speed of each section of the conveying device, rolling the steel bar wire, conveying the rolled steel bar wire downstream ,
The spiral pitch is placed on the transport device, and the ring pitch of the steel bar wire transported downstream is measured,
Detecting a section in which the non-uniform ring pitch exists,
A method for transporting a bar wire, wherein a transport speed of the downstream section adjacent to the detected section is changed . Oite in one section, the pitch P1 of the long steel wire placed on the spiral which is being conveyed at the conveying speed V is measured,
If the measured pitch of long products wire P1 is sufficient that small dense state than a predetermined value, the conveyance of adjacent to and downstream near Ru another section to the one section of the measurement of the ring pitch P1 Increase the speed,
Wherein if the pitch P1 of the measured long products wire is sufficient that large sparse state than a predetermined value, the conveyance of the other sections in the adjacent and downstream to the one section of the measurement of the ring pitch P1 Slow down the speed,
Oite to another section located downstream Ri by the other section, the measured ring pitch P2 of the long product wire, if the ring pitch P2 measured in the predetermined condition, the other section method of transporting long products wire according to claim 1, wherein the returning the conveying speed of the emission based.