JPH06441Y2 - Reheat trough device for wire rod - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a reheat trough device for wire rods, and more specifically, to the temperature of the surface and the inside of a wire rod that has been water-cooled by a shower device immediately after hot rolling. The present invention relates to a reheat trough device for a wire rod that equalizes the difference and prevents deterioration of the mechanical properties of the wire rod due to the continuous temperature difference.

[Conventional technology]

The wire rod is shipped after the steel slabs sent from the continuous casting facility of the steel mill are sequentially rolled by several hot rolling mills, processed by the subsequent rectifying facility.

In the rolling of such a wire rod, when a steel slab is rolled to a diameter of, for example, 5.5 to 16 mm in a hot rolling line and continuously taken out from a final finishing mill, the wire rod is sent to a water cooling zone immediately after the rolling mill. To be While the wire passes through the water cooling zone at a high speed of about 80 m / sec, it is shower cooled with water jet. A temperature difference occurs between the surface and the inside of the wire rod cooled in such a short time. If this temperature difference is left, the mechanical properties of the wire will become undesired.Therefore, a plurality of recuperation troughs will be placed to allow the wire coming out of the water cooling zone to pass through and to eliminate the temperature difference between them. It is designed so that the temperature is evenly distributed.

By the way, the recuperation trough 20 used conventionally is
As shown in FIG. 8, a conical passage 20b for introducing the wire rod 1 and a wire rod passage 20a following the cone passage 20b are formed therein. Although not shown, the recuperating trough 20 has an upper and lower two-divided structure, and there is a pair of mounting flanges 20c, 20c on the front and rear of the outside, respectively, and both are integrated.

Since the recuperating trough 20 is, for example, about 1 m, the wire rod 1 passes through the inside of the plurality of recuperating troughs 20 arranged in series after exiting the water cooling zone. At that time, there is a difference between the speed of the wire drawn from the hot rolling line and the speed at which the wire is wound at the rear end of the conditioning equipment, or the twisting of the wire during winding affects the wire. Looseness or tension occurs,
Shake left and right. When the wire rod that moves at high speed while causing the runout repeatedly contacts the conical passage of the recuperating trough or the inner wall of the wire rod passage, the recuperating trough is flawed and wear of the portion progresses.

FIG. 9 shows the actually worn portion in black. When the recuperator trough 20 is virtually divided into the front portion 20A, the middle portion 20B, and the rear portion 20C in the M direction through which the wire passes, the conical passage 2 is formed in the front portion 20A.
0b from the end to the wire passage 20a, the middle portion 20B
It can be seen that the wear is remarkable at the central portion of the wire rod passage 20a and at the outlet side of the wire rod passage 20a at the rear portion 20C. Looking at this for one year's data, in the front part 20A, there are 32 cases of wear that makes continuous use impossible,
Next, 11 are generated in the rear portion 20C, and 7 are generated in the middle portion 20B. The recuperating trough 20 shown in FIG. 8 must be discarded at any part if the wear is significantly advanced, and the recuperation is done for each recuperating trough, and the replacement work becomes a whole. The repair cost will be significantly increased.

As an alternative to the above troughs, FIGS. 10 and 1
A recuperation trough 21 as shown in FIG. 1 is used. This is a casing 22 and a guide member 23 incorporated therein.
, And both are of a two-divided type that face each other across the wire moving direction M. One bolt 2 is provided on each of the upper and lower central portions of the upper guide member 23a and the lower guide member 23b.
4, 24 (see FIG. 12) are integrated by welding or the like, and the bolts 24, 24 are inserted into the upper casing 22a and the lower casing 22b and fixed with nuts.
A hinge 25 that connects the upper casing 22a and the lower casing 22b is provided, and when the handle 26 is raised, the upper casing 22a can be rotated as indicated by a chain double-dashed line. The wire rod passage 23 is provided in the guide member 23 mounted in the casing 22 of the two-part open type trough.
c is formed. Therefore, when the guide member 23 is worn, it is only necessary to replace it, and the casing 22
It is also possible to replace only the guide member on one side, which is subject to severe wear, without being discarded. It should be noted that such a plurality of casings 22 are sequentially mounted on a frame 28 fixed to a frame 27, and a recuperation trough row is formed between a first water cooling zone and a second water cooling zone (not shown).

[Problems to be solved by the device]

By the way, in the individual reheat troughs in the reheat trough apparatus, as described above, the reheat trough itself has a wire rod passage or a built-in two-divided guide member in which the wire rod passage is formed. The guide member is the same as the casing, for example
It has a length of 1000 to 1400 mm, and it is used for one piece in one casing, and it has substantially the same structure as the case where the wire rod passage is directly formed in the recuperation trough. In either structure, if it is used for a certain period of time, local wear occurs as described with reference to FIG. 9, and the trough or guide member must be replaced over the length of one line, which is still expensive. There is a growing problem.

In addition, in the recuperator trough device equipped with the guide member, it is bolted to the casing, so it takes time and labor to replace the guide member that must rely on manual work, and labor productivity is reduced. To do. Further, the down time of the hot rolling line accompanying the replacement becomes long, and the productivity of the wire rod is inevitably reduced.

The present invention has been made in view of the above problems, and an object thereof is to reduce the time and labor required for disassembling and assembling the guide member incorporated in the reheat trough, and shortening the replacement time. It is possible to replace only the heavily worn parts in the two recuperation troughs so that the less worn parts can be used continuously, and if the wear is unevenly distributed in the circumferential direction of the inner surface, To change the posture to a place with less wear and to extend the use of the guide member, which reduces the overall consumption of the guide member and the replacement frequency, and reduces replacement work and inspection work. And that the guide member has a simple structure so as not to shift in the reheat trough as the wire moves.
It is an object of the present invention to provide a reheat trough device for wire rods that realizes the above.

[Means for Solving the Problems]

The present invention is to equalize the temperature of a wire rod while hot-rolling it and then water-cooling the wire rod while successively passing it through a guide member that is sandwiched by two-part split single-opening troughs that face each other along the wire moving direction. It is applied to the recuperation trough device designed to

The feature is that, as shown in FIG. 1 and FIG. 2 (a), the guide member 3 is provided with two half-split type single-opening troughs 2.
It is composed of a plurality of pipe materials 3A to 3C (see FIGS. 4 (a) and 4 (b)) arranged in series inside the pipe materials 3A to 3C.
Among them, a ring-shaped engaging portion 4 is formed at least on the outer periphery 3b of the pipe material 3C located on the downstream side in the wire rod moving direction M, and the pipe material 3 is provided inside the two-part split open trough 2.
A semi-circular groove 2d into which A to 3C is fitted is extended in the wire rod moving direction M, and at a location corresponding to the ring-shaped engaging portion 4,
That is, the locking groove 5 into which the ring-shaped engaging portion 4 is fitted is formed.

[Action]

The wire rod 1 exiting the hot rolling line is cooled in a short time while traveling at high speed in the water cooling zone 29 shown by the broken line in FIG.
In the shower-cooled wire 1, a temperature difference inevitably occurs between the surface and the inside. This wire 1 is a water cooling zone 2
Immediately after 9 and passing in the direction of arrow M one after another through the inside of the guide members 3 and 3 sandwiched by a plurality of two-division type single-opening troughs 2 and 2 which are arranged in series at a small interval. To do.

The guide members 3 made of a plurality of pipe members 3A to 3C are arranged in series in each of the two-division type single-opening type troughs 2 (see FIG. 5).
(a)), of the pipe materials 3A to 3C, at least the outer circumference 3 of the pipe material 3C located on the downstream side in the moving direction M
A ring-shaped engaging portion 4 is formed on b. Then, a semi-circular groove 2d into which the pipe members 3A to 3C are fitted is extended in the moving direction M of the wire (see FIG. 3 (a)) in the inside of the two-division type single-opening type trough 2, and the ring shape thereof is formed. A locking groove 5 into which the ring-shaped engaging portion 4 is fitted is formed at a position corresponding to the engaging portion 4. The guide member 3 is prevented from being dragged as the wire rod 1 moves.

The wire rod 1 passing through the insides of the pipe members 3A to 3C is reheated in a narrow space and the temperature difference remaining between the surface and the inside is eliminated, so that temperature equalization is achieved. The soaked wire 1 is
It is moved without impairing desired properties such as mechanical strength, and is wound and bound while repeating cooling and reheating as necessary.

If there is a difference between the speed of the wire rod 1 taken out from the final finish rolling mill and the winding speed, or if twisting occurs during winding, the wire rod 1 moving inside the pipe materials 3A to 3C is affected by the influence. Touch up / down / left / right. The runout causes wear on the inner surfaces of the pipe members 3A to 3C. The wear is usually distributed at several defined places of the guide member 3, although it depends on the location in the recuperation trough train. Also, in the circumferential direction, it is often biased to one side.

At the time of inspection, if the upper part of the two-part split single-opening trough 2 is rotated to the position shown by the chain double-dashed line in FIG. 1, the pipe materials 3A to 3C can be easily taken out, and any of the pipe materials is severely worn. You can check whether it is in the circumferential direction. If it can be used continuously just by turning it, turn it,
If that is not possible, replace it. By performing such inspection and replacement, it is possible to perform maintenance with the replacement portion minimized, as compared with the conventional case where the guide member for one reheat trough is replaced. Further, the replacement work and the assembly work after the replacement become extremely easy.

[Effect of device]

According to the present invention, by simply opening the upper portion of the two-piece type single-opening trough, the labor required for disassembly and assembly during inspection is saved,
Inspection time is greatly reduced. Further, the down time of the hot rolling line can be shortened, and the productivity of the wire rod and the labor productivity in the inspection work can be improved.

In addition, among the plurality of pipe members that form the guide member,
Even if there is wear, the pipe material in which the locations of occurrence are uneven in the circumferential direction can be reused by turning, so that the service life can be extended. Furthermore, if the wear becomes severe,
It is possible to reduce the maintenance cost by partially replacing the guide member as a single member that can be continuously used, unlike the conventional one.

A ring-shaped engaging portion is provided at least on the outer periphery of the pipe material located at the downstream end in the wire rod moving direction among the plurality of pipe materials sandwiched by the recuperative trough, and the ring-shaped engaging portion corresponding to the ring-shaped engaging portion is provided. Since the locking groove is formed inside the heat trough, the pipe material does not shift in the moving direction of the wire. With such a guide member, the temperature difference between the surface and the inside of the wire after shower cooling is equalized, and a high-quality wire having desired mechanical properties can be manufactured.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings of its embodiments.

FIG. 7 is an overall plan view of the recuperator trough device, and the distance from the final shower 29a of the first water cooling zone 29 shown by the broken line to the first shower 31a of the second water cooling zone 31 is, for example, 20 to 25 m, In the meantime, a plurality of two-division type single-opening troughs 2 (hereinafter referred to as recuperation troughs) are arranged in series at a small interval, and one recuperation trough example 13 is formed. In this example, the length is 1000 to 1 at intervals of about 200 mm.
15 troughs 2 and 2 of 400 mm are installed, and a measuring machine 30 is arranged at the rear part of the NO.5 trough 2. Then, when the wire rod 1 moves from the NO.5 trough 2 to the NO.6 trough 2, the wire diameter is measured by the measuring machine 30, passes through the NO.15 trough 2, and is introduced into the shower 31a. Has become.

FIGS. 1 and 2 (a) are a cross-sectional view and a side view of a single split recuperating trough with two splits. The recuperating trough 2 faces the moving direction M of the wire. It is a split type. It comprises an upper trough body 2A and a lower trough body 2B, which can be opened by a hinge 6.

A hollow pipe member 3 as a guide member 3 is interposed in the recuperating trough 2. As shown in FIG. 4 (a), these are applied to the recuperation trough 2 having a length of about 1400 mm by arranging three ground pipe materials 3A to 3C in series. For example, as shown in FIG. 6, when two pipe materials 3D and 3E are adopted, it is applied to a recuperation trough with a length of 1000 mm, and in that case, two to three recuperation troughs are installed. When increasing or not increasing, reheat trough row distance is about 20 m
You should keep it in.

As shown in FIG. 1, inside the recuperating trough 2, a semi-circular arc groove 2d is formed in the center of the joining surface 2c where the lower surface 2a of the upper trough body 2A and the upper surface 2b of the lower trough body 2B abut.
It is extended along the moving direction M of the wire (Fig. 3 (a)
reference).

On the other hand, as shown in FIG. 4 (a), the outer circumference 3b has a semi-circular groove 2
The pipe materials 3A to 3C fitted in d are formed by grinding a commercially available thick-walled steel pipe of carbon steel or stainless steel, for example. That is, the inner surface of the wire rod passage 3a is finished to be extremely smooth in advance, and the outer surface of the thick drawn steel pipe is ground to form the outer periphery 3b of the pipe members 3A to 3C. In addition, among the pipe materials 3A to 3C, at least the outer periphery 3b of the pipe material 3C located on the downstream side in the moving direction M of the wire,
The ring-shaped engaging portion 4 is formed. Although the ring-shaped engaging portion 4 is formed at the front end of the pipe material 3C, it may be formed at the center or near the rear end thereof. In short, this ring-shaped engaging portion 4
It suffices that the pipe member 3C is fitted in a locking groove 5 described later so that the pipe member 3C does not shift even if the wire rod moves, and the pipe members 3A and 3B having no ring-shaped engaging portion are arranged on the upstream side of the pipe member 3C. However, it is only necessary that the entire pipe material is not dragged by the wire material.

Inside the upstream end of the above-mentioned pipe material 3A, in order to reduce the contact with the wire rod 1 which is introduced at high speed while touching vertically and horizontally to facilitate the introduction, a conical shape that spreads toward the upstream side The passage 3c is formed. And the pipe materials 3B, 3
A conical opening 3d expanded by grinding is also formed on the upstream end of C. By the way, each pipe material 3
The length is about 500 mm or less.

On the other hand, the recuperation trough 2 shown in FIGS. 3 (a) and 5 (a)
The lower trough body 2B and the upper trough body 2A (see FIG. 1) have a pipe material 3C in addition to the above semicircular groove 2d.
A locking groove 5 into which the ring-shaped engaging portion 4 is fitted is formed at a location corresponding to the ring-shaped engaging portion 4. When the ring-shaped engaging portion 4 is fitted into the locking groove 5, the guide member 3 is prevented from being dragged in the moving direction M when passing the wire 1. Since both the semi-circular groove 2d and the locking groove 5 are ring-shaped, the pipe members 3A to 3C can be individually turned to easily change the positions such as up and down.

If it is desirable to further widen the upstream end of the conical passage 3c in order to avoid contact with a wire rod moving at high speed, as shown in FIG. It suffices if a cylindrical ring-shaped engaging portion 4A having a larger diameter is formed. In this case, as shown in FIG. 2 (b), FIG. 3 (b) and FIG. 5 (b), the locking groove 5A into which the ring-shaped engaging portion 4A is fitted also has a corresponding shape. The thin hollow pipe 5a divided into two is integrated with the upstream end surface of the recuperating trough 2.

Further, as shown in FIG. 4 (b), a ring-shaped engaging portion 4 is also formed on the pipe material 3B, and the pipe material 3B is fitted into the reheat trough 2 at a location corresponding to the ring-shaped engaging portion 4. Locking groove 5
May be provided (see FIG. 3 (b)).
In this way, a large number of ring-shaped engaging portions 4, 4A and locking grooves 5, 5
By engaging with A, the displacement of the pipe member 3 can be prevented more reliably while the wire rod is passing.

A hinge 6 is attached to the side surface 2e of the recuperating trough 2 shown in FIG. 1, and a handle 7 is provided on the upper surface of the upper trough body 2A.
The upper trough body 2A can be rotated in the direction of the arrow S by grasping. When the upper trough body 2A is rotated to the position indicated by the chain double-dashed line, the pipe members 3A to 3C arranged on the lower trough body 2B can be easily taken out.

Further, as shown in FIG. 1 and FIG. 5 (a), mounting flanges 8, 8, 8A, 8A are attached to the bottom end of the lower trough body 2B at the upstream end and the downstream end. ing. The bolt hole 8a provided in the mounting flange 8 is circular, but the bolt hole 8b of the mounting flange 8A is oval. This is because the reheat trough 2 and the guide member 3 move from room temperature to about 30 degrees while the hot wire 1 passes through the wire passage 3a.
This is for allowing the thermal expansion of the recuperating trough 2 because the temperature is raised to 0 ° C. Even when the bolt 9 is tightly tightened to some extent, the bolt 9 screwed into the plate mount 12a can slightly move within the oval bolt hole 8b due to expansion due to expansion.

By the way, the guide member 3 and the recuperation trough 2 shown in Fig. 5 (a).
The difference in thermal expansion between the guide member 3 and
If the amount of thermal expansion is larger than that of the recuperating trough 2, the problem can be solved by causing the end portion of the pipe material 3A to approach the upstream side from the end opening of the recuperating trough 2. In addition, pipe material 3B
Regardless of the presence or absence of the ring-shaped engaging portion 4, the amount of thermal expansion is normally absorbed by the slight gap formed between the ring-shaped engaging portion 4 of the pipe material 3C and the locking groove 5. It

The recuperating trough 2 sandwiching the guide member 3 shown in FIG. 1 is mounted on an upper pedestal 12 on a lower pedestal 11 mounted on a vertical frame 10. That is, the frame 10 is
It is erected upright along the recuperation trough row 13 (see FIG. 7), and the lower frame 11 and the upper frame 1 are mounted on the frame 10.
2 is attached by bolts. When the recuperating trough 2 is attached to the plate base 12a, a protrusion 12b having a reference surface is provided on the inside in order to facilitate the positioning thereof.

According to the recuperation trough device having such a configuration, the temperature difference between the surface and the inside of the shower-cooled wire rod 1 is eliminated as described below, and each of the recuperation trough rows 13 constituting the recuperation trough row 13 is eliminated. The heat trough 2 can be inspected efficiently.

While the billet is continuously rolled in the hot rolling line and the wire rod 1 in the high temperature state is introduced into the first water cooling zone 29 shown by the broken line in FIG. 7 and sent in the moving direction M at that speed. Shower cooled. Even after the final cooling by the shower 29a is completed, the cooling is performed for a short time as a whole, so that a temperature difference remains between the surface and the inside of the wire 1.

The wire rod 1 is the NO. 1 trough 2 (secondary trough 2 of the recuperator trough row 13 installed in series immediately after the shower 29a with a small interval.
(A) and (b)), the conical passage 3 of the pipe material 3A is shown.
It is introduced from c and enters the wire rod passage 3a. After that, it travels through the conical openings 3d of the pipe materials 3B and 3C and the wire passage 3a and is led out to the NO.2 trough 2. The wire rod 1 that has passed through the plurality of troughs 2 and 2 in this way is measured for wire diameter by the measuring machine 30 when it exits from the NO.5 trough 2. Further, the wire rod 1 is introduced into the NO.6 trough 2, then moves to the NO.15 trough 2, and is introduced into the first shower 31a of the second water cooling zone 31.

The wire 1 is reheated while passing through the reheat trough row 13 consisting of these 15 reheat troughs 2, the temperature difference generated between the surface and the inside is eliminated, and desired mechanical properties are maintained. It Similar reheat trough rows are provided between the third water cooling zone and the fourth water cooling zone (not shown), which are provided as necessary, and the wire rods that pass through them are fed by the winder at the final stage of the conditioning device. It is wound up, bundled and shipped.

However, if there is a slow speed between the speed derived from the final finish rolling mill of the hot rolling line and the winding speed, or if there is twisting of the wire rod due to winding,
The wire rod 1 moving in the recuperation trough row 13 under the influence of that is touched vertically and horizontally. Therefore, from the base of the conical passage 3c of the pipe material 3A shown in FIGS. 5 (a) and (b) to the wire rod passage 3a.
Wear gradually occurs over the entire length (see FIG. 9). Further, the rear portion of the wire rod passage 3a of the pipe member 3C is also worn and also generated in the central portion of the pipe member 3B. In addition,
Any of the wear points does not uniformly occur in the circumferential direction of the occurrence point, and is often biased to one point in the circumferential direction.

In order to confirm the presence or absence of this wear, maintenance inspections are performed once a week and regular inspections are carried out a few times a year. The hot rolling line is suspended during the inspection, but even if the inspection is performed manually, the length of the reheat trough row 13 shown in FIG.
The 15 recuperation troughs 2 of 00 mm can be easily opened by raising the handles 7 shown in FIG. As shown in Fig. 5 (a) and (b), the pipe material 3
A to 3C are exposed, and the pipe material 3A having a high wear rate is closely checked. Even if there is wear, if it is partial in the circumferential direction, it will rotate and be fitted into the wire rod passage 3a again. The other pipe materials 3B and 3C are checked in the same manner, and new pipes are fitted if necessary. After such exchange or turning, each upper trough body 2A may be returned to the position indicated by the solid line in FIG. The maintenance and periodic inspection of one recuperation trough row 13 can be completed in about one hour or less than two hours.

As can be seen from the above description, the inspection time can be significantly shortened as compared with the conventional recuperation trough. Therefore, the downtime of the hot rolling line is shortened, the productivity of the wire rod is improved, and the labor productivity can be increased accordingly. The guide member can be separated into two or three in the wire rod movement direction, and appropriate treatment can be performed depending on the wear condition, and repair costs can be reduced.

[Brief description of drawings]

FIG. 1 is a transverse cross-sectional view showing a mounted state of a two-piece type single-opening type trough constituting a reheat trough device for wire rod of the present invention, FIG.
(a) is a view taken along the line II-II in FIG. 1, FIG. 2 (b) is a side view of a recuperation trough having two locking grooves, and FIG. 3 (a) is one locking groove. Fig. 3 (b) is a plan view of the lower trough body provided, Fig. 3 (b) is a plan view of the lower trough body having two or three locking grooves, and Fig. 4 (a) is one ring-shaped engaging portion. FIG. 4 (b) is a longitudinal sectional view of a guide member made of three pipe materials, and FIG. 4 (b) is a vertical sectional view of a guide member made of three pipe materials in which two or three ring-shaped engaging portions are formed. FIG. 5 (a) is a plan view of the lower trough body in which a guide member having one ring-shaped engaging portion is fitted, and FIG. 5 (b) shows a guide member having two or three ring-shaped engaging portions. FIG. 6 is a plan view of the fitted lower trough main body, FIG. 6 is a plan view of the lower trough main body having a guide member made of two pipe materials, and FIG. 7 is a schematic explanatory view of a recuperation trough row. Is the vertical section of the conventional recuperation trough Fig. 9 is a schematic view of the distribution of wear generated in the recuperation trough, Fig. 10 is an example of a conventional recuperation trough, and Fig. 11 is a side view thereof.
FIG. 12 is a sectional view taken along the line XI-XI in FIG. 12, and FIG. 12 is XII-X in FIG.
FIG. 2 is an enlarged sectional view taken along the line II. 1 ... Wire rod, 2 ... Two-part split single-opening trough (reheat trough), 3 ... Guide member, 3A to 3E ... Pipe material, 3b
...... Outer circumference, 4, 4A ... Ring-shaped engaging part, 2d ... Semi-circular arc groove, 5, 5A ... Locking groove, M ... Wire rod moving direction.

Claims (1)

[Scope of utility model registration request] 1. A wire soaked while hot-rolled and water-cooled is successively passed through a guide member sandwiched between two-division type single-opening troughs facing each other along the moving direction of the wire. In the recuperating trough device configured to be made more efficient, the guide member includes a plurality of pipe members arranged in series in each of the two-division type single-opening type troughs, and at least the pipe member moving direction A ring-shaped engaging portion is formed on the outer periphery of the pipe material located on the downstream side of the, and a semi-circular arc groove into which the pipe material is fitted is formed in the wire movement direction inside the two-division type single-opening trough. A reheat trough device for wire rod, which is extended and has a locking groove into which the annular engaging portion is fitted, at a location corresponding to the annular engaging portion.