JP2003053402A - Method and equipment for continuously rolling metallic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and equipment capable of stably and continuously rolling a metallic material. SOLUTION: After successively rolling a metallic rough shape material by a rolling mill array on the upstream side of a rolling line on which a plurality of rolling mill arrays are arranged in series, the succeeding metallic base stock is clamped with the movable joining device while holding a preceding metallic base stock with a pinch roll fixed to a movable joining device which is movable back and forth between the rolling mill train on the upstream side and the rolling mill array on the downstream side and advanced at a speed exceeding the advancing speed of the preceding metallic base stock detected with the pinch roll of the movable joining device. Positioning is performed by striking the tip of the succeeding metallic base stock to the rear end of the preceding metallic base stock, both base stocks are joined and made into a finished metallic material by continuously rolling by the rolling mill array on the downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rolls a metal raw material such as a billet into a metal rough material having a predetermined size, and then joins a preceding metal rough material and a following metal rough material in a rolling line. The present invention relates to a continuous rolling method for continuously rolling metal material and its equipment. In the present invention, the "metal rough material" means a so-called intermediate stage material after the metal raw material is subjected to rolling such as rough rolling.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a long metal material having a predetermined cross-sectional area and shape such as a wire, a rod, or a strip from a metal material such as a bloom or a billet, hot working Rolling is performed. What is hot rolling?
This is a method of rolling a metal raw material heated to a high temperature or a high temperature metal raw material obtained by continuous casting into a metal material having a desired size and shape.

By the way, in such hot rolling, metal base materials having a finite length are sequentially rolled one by one,
In so-called batch rolling, there is a time interval between the rolling of one metal blank and the rolling of the next metal blank, and a portion of the metal blank or a part of the rough metal after rough rolling is removed. There was a case where it was forced to stand on the floor and wait. For this reason, there has been a problem that the temperature of the metal base material and the metal rough material is unavoidably lowered, and reheating is required when rolling them.

To solve such a problem, for example, Japanese Patent Laid-Open No.
-5803 discloses a so-called continuous rolling method. The technique described in Japanese Patent Application Laid-Open No. 10-5803 is a process in which a plurality of materials (form materials) are sequentially rolled by a first rolling mill train, and a traveling welding machine is moved in synchronization with the movement of the materials. Meanwhile, the step of connecting the trailing edge of the preceding material and the trailing edge of the following material by flash butt welding to form a continuous material, the grinding step for removing burrs from the welded portion of the continuous material, and the continuous material further downstream. And a step of continuously rolling with the second rolling mill train arranged in step 1.

[0005]

In the technique described in Japanese Patent Application Laid-Open No. 10-5803, as described above, while the traveling welding machine is moved in synchronization with the movement of the preceding material,
The step of connecting the trailing end of the preceding material and the leading end of the following material by flash butt welding is an essential requirement.
However, when the present inventors repeated various trials, it was found that there is a serious problem in such a synchronous movement system of the bonding apparatus which synchronizes with the movement of the material.

That is, it is difficult to measure the accurate moving speed of a material that moves hot, or extremely expensive measuring equipment is required, and even if the accurate moving speed of the material can be measured. However, it is difficult to accurately follow a moving speed of the preceding material in a short time with high accuracy by a trolley having a large welding machine, or a complicated and expensive control mechanism is required.

If the synchronization is insufficient, the joining point does not fall within the optimum position range between the electrode holding the leading material and the electrode holding the trailing material. It has been found that problems such as insufficient strength and defective shape of the joint occur, and in extreme cases, joining may not be possible. Also, if the synchronization is insufficient,
After grasping the preceding material, it was found that there is a problem that the preceding material forms a loop and protrudes from the rolling line, making continuous rolling impossible.

Further, the inventors of the present invention, when joining the leading material and the trailing material, cause the leading material to sag, bend, etc., so that the leading material is appropriate for the electrode holding the leading material. There is a case where the phenomenon of escaping from the position may occur, so that when welding is not possible or it takes a lot of time to adjust to the proper position for joining the trailing end of the preceding material, finally traveling welding It has been found that it becomes difficult to adjust the position to the proper position within the traveling range of the machine, and it becomes impossible to join them.

Further, when joining the preceding material and the succeeding material, the present inventors often have a situation where the trailing end surface of the preceding material and the succeeding material end surface do not properly face each other. Therefore, it was found that the strength of the joint varies. The present inventors have found that one of the causes is FIG.
We have found that there is a bend in the preceding material, as shown in the example in.

The present invention has been made to solve the above-mentioned problems of the prior art, and proposes a method for continuously rolling a metal material and a facility therefor, which has high productivity and enables stable continuous rolling. The purpose is to do.

[0011]

In order to achieve the above-mentioned object, the present inventor has proposed a method for aligning a preceding material (coarse metal material) and a following material (coarse metal material) in joining. Through diligent studies, an extremely simple and reliable positioning method for joining was found. The present invention has been completed by further studies based on the above findings. That is, in the first aspect of the present invention, a metal raw material is sequentially rolled by a rolling mill row upstream of a rolling line in which a plurality of rolling mill rows are arranged in series to obtain a metal rough material. The trailing end of the preceding metal rough material is joined to the leading end of the following metal rough material,
A metal finish is obtained by continuously rolling in a downstream rolling mill row, in a continuous rolling method of a metal material, while sandwiching the preceding metal rough material, gripping the following metal rough material, and then The metal rough material is advanced at a speed higher than the advance speed of the preceding metal rough material, and the leading end of the following metal rough material is abutted against the trailing end of the preceding metal rough material to position it. It is a continuous rolling method for a metal material, characterized in that it joins a rough metal material to be carried out.

Further, in the first aspect of the present invention, after gripping the trailing metal rough material, the leading end of the trailing metal rough material is located at a predetermined position above the rolling pass line of the downstream rolling mill train. After being moved and held so as to be in a position, the trailing end of the preceding metal rough material is moved forward from the predetermined position, and the leading end of the trailing metal rough material is lowered to the rolling pass line, and then, It is preferred to advance at a rate greater than the rate of advance of the preceding rough metal material.

Further, in the first aspect of the present invention, the joining is performed by providing a movable joining device capable of reciprocating between the upstream rolling mill row and the downstream rolling mill row, and the pinching is performed. The movement is performed by a pinch roll provided in the moving joining device, the holding is performed by holding means provided in the moving joining device, and the trailing movement of the rough metal material is performed by the moving joining device. It is preferable that the advance is performed at a speed exceeding the advance speed of the preceding metal rough material due to the advance and the advance of the gripping means.

Further, in the first aspect of the present invention, it is preferable that the forward movement of the movable joining apparatus is adjusted according to the forward movement speed of the preceding rough metal material detected by the pinch roll. Further, in the first aspect of the present invention, it is preferable that the joining is performed by flash butt welding.
In the present invention, it is preferable that the metal material is a linear material or a rod-shaped material, and in the first invention, the movable joining device is preferably a carriage.

According to the second aspect of the present invention, an upstream rolling mill train for sequentially rolling a metal raw material into a rough metal material and a trailing end of a preceding rough metal material and a leading end of a subsequent rough metal material are joined together. A continuous metal rough material, which is disposed between the upstream rolling mill row and the downstream rolling mill row and is capable of reciprocating movement between the upstream rolling mill row and the downstream rolling mill row. And a downstream rolling mill train that rolls the continuous metal rough material into a metal finishing material, in a continuous rolling equipment for metal materials sequentially arranged in series, the movable joining device, the preceding metal rough material It is a continuous rolling facility for metal materials, which has a pinch roll for pinching (pinching) and a gripping device for gripping a rough metal material that follows.
Further, in the second aspect of the present invention, it is preferable that the movable joining device is a dolly, and in the second aspect of the present invention, the holding device includes a holding means for holding a rough metal material that follows.
It is preferable to have a moving means fixed to the gripping means to move the gripping means. Further, in the second aspect of the invention, the movable joining device is provided with a preceding metal roughing member attached to the pinch roll. It is preferable to have speed control means for controlling the advancing speed based on information from the moving speed measuring means of the material.

Further, in the second aspect of the present invention, a standby / feeding device for waiting / feeding out the metal coarse material supplied to the mobile joining device is provided between the mobile joining device and the upstream rolling mill train. It is preferable to provide. In addition, in the second aspect of the present invention, it is preferable that a deburring device that cuts and removes burrs generated at the joint portion of the continuous metal rough material is provided between the movable joining device and the downstream rolling mill train. . In the second aspect of the present invention, a metal rough material or a continuous metal rough material is conveyed between at least the upstream rolling mill row and the downstream rolling mill row, which is at least the moving range of the movable joining device. It is preferable to provide a retractable roller table for supporting.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. FIG. 1 shows an example of continuous rolling equipment for metal materials suitable for carrying out the method of the present invention. In the present invention, the metal base material is rolled into the metal finish material (product) using a plurality of rolling mill rows arranged in series. A metal raw material (billet) 1 directly sent from a continuous casting machine (not shown) or heated by a heating furnace 2 is roughened by a plurality of rolling mill rows at an upstream rolling mill row (rough rolling mill row) 3. It is rolled into a rough metal material 5. The rough metal material is then rolled by a downstream rolling mill train (intermediate rolling mill train) 13 and, if necessary, further finished rolling by a further rolling mill train (finish rolling mill train) 14 to obtain a metal finishing material for the product. It is said that

In the present invention, the movable joining device 12 is arranged between the upstream rolling mill train 3 and the downstream rolling mill train 13. This movable joining device 12 joins the leading end of the trailing metal rough material 10 to the trailing end of the leading metal rough material 11 to form a rolling mill row downstream.
13. Rolling is continuously performed in the rolling mill row 14 downstream if necessary. Incidentally, the tips of the metal rough materials 10 and 11 to be joined,
It is preferable that the rear end is cut by a cutting machine 4 when it comes out of the rolling mill row 3 on the upstream side, and the end face is adjusted to a shape suitable for joining. As the cutting machine 4, a crop shear, a traveling saw machine, or the like can be preferably used.

Leading metal rough material 11 Trailing end and trailing metal rough material 10
The movable joining device 12 for joining the leading ends is arranged so as to be able to reciprocate between the upstream rolling mill train 3 and the downstream rolling mill train 13. For this reason, the mobile joining device 12 is preferably a dolly. Moving means of the movable joining device 12 (not shown)
Is a self-propelled method in which wheels or pinions are driven by a motor mounted on the movable joint device 12 (in this case, a rack and pinion method), or a passive method using an externally provided cylinder. Good.

The upstream rolling mill train 3 and the downstream rolling mill train 3
The reciprocation between 13 does not necessarily mean only a linear movement.For example, at the time of joining, it moves in the rolling line along the transport direction of the preceding rough metal material and the following rough metal material, but the return does not occur. It may be one that retreats outside the rolling line and moves. Further, the joining in the present invention is not particularly limited to the method as long as strong joining can be obtained in a short time, but flash butt welding is most preferable as a joining method that meets this purpose. There is no problem even if the induction heating welding method using a coil is used.

The mobile joining device 12 of the present invention comprises a joining means 16
In addition, it is characterized by having a means for pinching the preceding metal rough material (pinch roll 50 in the illustrated example) and a gripping device 15 for gripping the following metal rough material. Here, the “clamping” means to restrain the free movement of the metal rough material in a direction other than the longitudinal direction, and to sandwich the metal rough material so as to be movable in the longitudinal direction. Further, “grasping” means clamping a rough metal material.

FIG. 2 is a plan view showing the outline of the movable joining apparatus 12. FIG. 2 shows a case where the mobile joining device 12 is returned to the position closest to the upstream rolling mill train 3. In the figure, 15 is a gripping device, 16 is a joining means, 10 is a trailing rough metal material, 11 is a leading rough metal material, 19 is a rolling line, 20 is a standby line, and 50 is a pinch roll. The gripping device 15 fixed to the movable joining device 12 has a gripping means 15d and moving means 15a to 15c. The gripping means 15d grips the trailing metal rough material 10, and the moving means 15a to 15c fixed to the gripping means 15d move the tip of the trailing metal rough material 10 to a predetermined position in the rolling line 19. Can be held. In addition, the subsequent metal rough material 10
It is preferable that the tip of the waiting line 20 is positioned at a predetermined position to be on standby, whereby the tip of the trailing metal rough material 10 gripped by the gripping means 15d is
It becomes possible to easily and accurately move and hold the movable joining device 12 in a predetermined position.

Further, according to the present invention, a standby line or a receiving line is provided between the movable joining device and the row of rolling mills on the upstream side, and the coarse metal material supplied to the movable joining device 12 is put on standby and sent out. It is preferable to provide a stand-by / feeding device. The standby / delivery device preferably has a gripping device and a shift mechanism. At this time, the trailing metal rough material 10 in the standby state may be kept in a stretched state (that is, in a state in which it is not bent) or may be bent by a looper to be in a standby state.

As shown in FIG. 2, the pinch roll 50 is fixedly mounted on the front end of the movable joining device 12 in the moving direction via a bearing (not shown), and the preceding rough metal material 11 is set in the rolling line. Hold (pinch). The pinch roll 50, until the metal rough material 11 preceding at the time of joining is clamped to the joining means 16,
The leading metal rough material (11) is clamped to prevent the trailing end of the leading metal rough material from escaping from the proper joining position. As a result, the preceding metal rough material 11 and the following metal rough material 10 can be abutted against each other in an appropriate state. The rotation speed of the pinch roll 50 clamps the preceding rough metal material (pinch).
After that, the speed of the preceding rough metal material is moved by the moving joining device.
It goes without saying that it is adjusted to match the forward speed of 12.

The pinch roll 50 is preferably provided with a moving speed measuring means 18a for measuring the moving speed of the preceding rough metal material, and measures the moving speed of the preceding rough metal material. It is preferable to adjust the advancing speed of the movable joining device 12 based on the information about the moving speed of the preceding rough metal material obtained by the moving speed measuring means 18a. As a result, the matching between the forward speed of the movable joining device and the forward speed of the preceding metal rough material is improved, and the preceding metal rough material 11
This facilitates alignment with the subsequent metal rough material 10 and enables proper joining in a short time. Further, there is an effect that it is possible to avoid the phenomenon of preceding loop formation of the rough metal material.

The pinch roll 50 sandwiches the preceding metal rough material 11 by a predetermined time (a predetermined length of the preceding metal rough material) before the advance start timing of the movable joining device 12 set in advance. It is preferable. By sandwiching the movable joining device 12 before the advance start timing, it is possible to accurately measure the advancing speed of the preceding metal rough material at a position close to the joining position. As a result, the forward speed of the movable joining device 12 can be adjusted more accurately, and proper joining can be performed in a short time.

Further, the joining means 16 installed in the movable joining device 12 has joining gripping means 16a and 16b for holding the leading metal rough material and the trailing metal rough material, respectively. The end faces of the materials are joined together to form a continuous metal rough material. FIG. 2 shows the case where the joining method is flash butt welding, and the joining gripping means 16a, 16b are clamp type electrodes which also serve as electrodes. In the present invention, the joining method is not limited to this, and the induction heating welding method does not pose any problem. In the case of the induction heating welding method, the joining gripping means 16a, 16b need only be a clamping mechanism, and it is necessary to dispose a coil around the joining position.

In the method of the present invention, it is preferable to carry out the joining using the above-mentioned movable joining apparatus 12. First, a trailing metal rough material is gripped by the gripping means 15d of the gripping device 15, and as shown in FIG.
It is moved and held by the moving means 15b of the gripping device 15 so as to be located at a predetermined position above the rolling pass line of the rolling mill row on the downstream side.

FIG. 3 shows a state in which the leading end of the subsequent metal rough material 10 is positioned in the movable joining device 12.
3A is a schematic plan view, and FIG. 3B is a schematic side view. Like flash butt welding or induction heating welding (or pressure welding), the specified length of the material to be welded (coarse metal material) is clamped by the clamp electrodes 16a and 16b, or surrounded by a coil (not shown). When it is necessary to do so, it is preferable that the gripping device 15 projects the tip of the trailing metal rough material 10 toward the front by a predetermined length for positioning.

Incidentally, in the positioning work of the trailing metal rough material 10 as described above, the rear end of the preceding metal rough material 11 is moved by the movable joining device.
It's better to do it while it's within 12. This is because in the present invention, it is necessary to quickly abut the tip of the trailing metal rough material 10 gripped by the gripping device 15 of the movable joining device 12 to the trailing end of the preceding metal rough material 11. Is. Therefore, FIG.
As shown in (b), the tip of the trailing metal rough material 10 is above the rolling pass line, and the tip of the trailing metal rough material 10 overlaps with the trailing end of the preceding metal rough material 11, The gripping device 15 positions it at a predetermined position which is the most suitable position, and waits for holding.

The trailing end of the preceding metal rough material 11 is a pinch roll 50.
After moving forward while being pinched (pinch) by,
While advancing the movable joining device 12, as shown in FIG. 4, moving means is moved from the position where the trailing rough metal material 10 is held in standby.
Immediately lowered into the rolling line by 15c. The movable joining device 12 advances the metal rough material 11 so that the speed thereof substantially matches the speed of advance of the preceding rough metal material 11. On the other hand, in accordance with this, as shown in FIG. 5, the trailing edge of the rough metal material 10 is moved to the rear edge of the leading rough metal material 11 by advancing the trailing rough metal material 10 by the moving means 15a. Strike.
At this time, the moving speed of the movable joining device 12 and the moving means 15a
The total speed of the advancing speeds of the above is higher than the advancing speed of the preceding metal rough material 11. At the position where it abuts, it is positioned and the preceding rough metal material 11 is joined to the joining means 16a as shown in FIG.
Then, the subsequent metal rough material 10 is clamped and joined by the joining means 16b. The rear end of the preceding metal rough material 11 is pinched (pinch) by the pinch rolls 50 to prevent the escape from occurring in a direction other than the longitudinal direction.
As shown in FIG. 5, the tip of the is preliminarily grasped at the optimum position for joining. Therefore, the trailing end of the preceding metal rough material 11 and the leading end of the following metal rough material 10 are necessarily suitable for joining. Abutting in the position and the abutting direction enables proper joining. Needless to say, it is not always necessary to pinch (nip) the trailing end of the preceding rough metal material with the pinch roll until the next joining preparation start time after being clamped by the joining means 16a. 6A is a schematic plan view,
FIG. 6B is a schematic side view.

The movable joining apparatus 12 of the present invention preferably has speed control means 17 for controlling the forward speed. It is preferable that the speed control means 17 adjusts the speed to an appropriate speed that approximately matches the moving speed of the preceding rough metal material 11. The moving speed of the preceding rough metal material 11 may be measured by the moving speed measuring means such as the peripheral speed of the measuring roll 18b or the rolling roll, but in the present invention, the pinch roll arranged in the movable joining apparatus. Metal rough material preceded by 50
It is preferable that the moving speed (forward speed) of 11 is detected and measured by the moving speed measuring means 18a attached to the pinch roll.

Information on the moving speed of the preceding rough metal material near the joining position, which is obtained by the moving speed measuring means 18a attached to the pinch roll, is used as the moving speed control means 17
It is preferable to adjust the advancing speed of the movable joint device 12 by inputting into By such a method, the matching between the forward speed of the movable joining device and the forward speed of the preceding metal rough material is further improved, and the alignment between the preceding metal rough material 11 and the following metal rough material 10 is performed. This facilitates the proper joining in a short time, and does not cause the problem of difficulty in synchronization as in the conventional technique.

When the joining is performed by flash butt welding, it is preferable that the preceding means 16a for joining the rough metal material also serves as an electrode. Further, the subsequent metal rough material 10 is clamped by the joining means 16b which also serves as an electrode at the time of joining. After the clamp is completed, electricity is applied between the trailing edge of the preceding material and the leading edge of the following material to perform flash butt welding joining. In the case of high frequency induction heating, the joint portion is heated and melted by a coil (not shown) and welded and joined.

When the joining is completed, the gripping by the joining means 16 is released, and the rough metal material (rolled material) is freed, and then the movable joining device 12 is retracted to the movement start point and the preparation for the next joining is started. . Further, in the continuous rolling facility of the present invention, it is preferable to provide a deburring device 30 for cutting and removing burrs generated at the joint portion of the continuous rough metal material, between the moving joint device and the rolling mill row downstream. The form of the deburring device 30 is not particularly limited, but for example, it is preferable that a plurality of blade pairs shown in FIG. 7 are installed in series in the rolling line direction.

In the continuous rolling equipment of the present invention, at least the table roll 9 between the upstream rolling mill row 3 and the downstream rolling mill row 13, which is the moving range of the movable joining device 12, is
The retractable roller table 90 is preferable. The retractable roller table is composed of a roller for transporting and supporting a metal rough material or a continuous metal rough material, and an apron.When the movable joining device 12 is running, the roller and apron are independently movable. It is preferable to arrange a plurality of roller table units, each of which has a retractable roller and a retractable apron having a structure capable of sequentially retracting at a position that does not interfere with the joining device 12, side by side.

FIG. 8 shows an example in which the retractable roller table 90 is arranged in the moving range of the movable joining apparatus 12 in the continuous rolling equipment for metallic materials. In FIG. 8, the movable joining device 12 is moving on the retractable roller table, and an example of the retracted state of the rollers and apron of each roller table unit is shown. While the tip of the first rolled material is running, both the roller and the apron of the retractable roller table are positioned on the rolling pass line 19 (a in FIG. 8). Since the rear end of the first rolled material is joined to the leading end of the next second rolled material, when the movable joining device 12 passes, the retractable roller in the range where it interferes with the moving joining device 12 The rollers and apron of the table are moved from a predetermined position on the rolling pass line 19 to a retracted position below the lower end passage line 191 of the movable joining device (b, c in FIG. 8). After passing through the movable joining device 12, only the roller 911 is moved from the retracted position to a predetermined position on the rolling pass line 19 (d in FIG. 8).

The retractable roller device illustrated in FIG. 8 includes a support shaft 97 disposed on a fixed frame 981 via a bearing,
It has a roller 911 that conveys a rough metal material (rolled material), a roller support arm 912, a roller support arm connecting body 913 fixed to the roller support arm, and a roller support arm turning drive means 914. When the retractable roller device is configured as described above and the roller support arm turning drive means 914 (cylinder) is driven in the direction in which the rod contracts, the other end of the roller support arm connecting body 913 moves to the cylinder side, and The roller support arm 912 pivots around the support shaft 97
Only the roller 551 moves from a predetermined position on the rolling pass line 19 to a retracted position below the passing line 191 at the lower end of the movable joining device. Further, when the cylinder is driven in the direction in which the rod extends, the roller 911 moves in the direction opposite to the above-described movement and returns from the retracted position to the predetermined position on the rolling pass line.

The retractable apron device shown in FIG. 8 includes a support shaft 97 disposed on a fixed frame 981 via a bearing,
An apron 921 for guiding a rough metal material (rolled material), an apron support 922, an apron support connection body 923, an apron turning drive means 924, and a drive means mounting base 925.
And rotating means 926. By constructing the retractable apron device as described above and rotating the rotating machine 926 in the counterclockwise direction, the drive means mounting pedestal 925 is tilted in the counterclockwise direction, and further, the apron turning. The second operation by driving the driving means 924 (driving the cylinder in the direction in which the rod extends) causes the apron to move.
921 can be quickly evacuated below the passing line 191 at the lower end of the mobile joining device 12.

Needless to say, the present invention is not limited to the above roller table. In addition, as the metal base material in the present invention, a bloom, a billet or the like which is a processing raw material such as a linear material, a rod-shaped material, or a mold material is suitable.
Further, the metal material produced by the continuous rolling method of the present invention is a linear material, a rod-shaped material, a shaped material, or the like, and particularly preferably a linear material or a rod-shaped material. Steel is the most common metal, but is not particularly limited to this, and may be a copper alloy, an aluminum alloy, or the like.

[0041]

Example Using the continuous rolling equipment shown in FIG. 1, a deformed steel bar was continuously rolled. A billet (120 mmφ) having a composition component of SD24 steel was used as the metal blank, and a rough rolling mill train (upstream rolling mill train) 3 was used to form a 45 mmφ metal rough blank. Among the obtained metal rough materials, the rear end of the preceding metal rough material is pinched (pinch) by the pinch roll by the movable joining device 12 of the present invention, and the metal rough material is successively followed in the rolling line. It is bonded to the tip of the and is continuously rolled in a downstream rolling mill train (intermediate rolling mill train, finishing rolling mill train) 13 as a continuous metal rough material for 15 m.
Deformed bar steel with mφ.

The joining method was flash butt welding. Incidentally, in joining, after using the moving joining device 12 of the present invention, after gripping the subsequent metal rough material 10,
The tip of the following rough metal material is above the rolling pass line,
It was moved and held to a predetermined position which was the optimum position for joining. After that, while the rear end of the preceding rough metal material is pinched by a pinch roll (pinch), it moves forward from the predetermined position described above, and then the front end of the rough metal material 10 that follows is lowered to the rolling pass line. Then, according to the advancing speed of the preceding rough metal material detected by the pinch roll, the movable welding device 12
Is advanced at a speed 20% higher than the advancing speed of the preceding metal rough material 11, and the trailing edge of the rough metal material 11 is followed by the rough metal material.
After abutting the 10 tips, they were clamped, energized, and welded together. No pinch with a pinch roll was performed after the clamp. For comparison, the metal rough materials were joined in the same manner except that the preceding metal rough materials were not pinched by the pinch rolls and were made free.

According to this method, 50 pieces of each of the rough metal materials were bonded and continuously rolled, but there was no bonding failure and the rolling could be completed. After rolling, for each joint,
Tensile tests were conducted, and all showed strengths higher than the base metal strength. In the example of the present invention in which the preceding rough metal material is pinched (pinch) by the pinch rolls, in the case of the comparative example in which the time required from the start of the advance of the movable joining device to the start of joining is not conveyed by pinch rolls On average,
It was reduced by 25%. In addition, in the present invention example, the occurrence of the trouble that makes continuous rolling impossible was not observed at all, which occurred in the comparative example although the frequency was low.

[0044]

As described above in detail, according to the present invention, the movable joining device such as the joining carriage is moved without performing high-level control, and the abutting position of the preceding material and the following material is still maintained. It is possible to perform the joining with the butt state and the butt state always in the optimum position and state for the joining, and it is possible to stably obtain a stable shape and a high-strength joined portion, which improves the yield and shortens the joining time. It will be possible in a stable manner, the production efficiency will be remarkably improved, and the industrially remarkable effect will be achieved.

[Brief description of drawings]

FIG. 1 is an overall view schematically showing an example of a continuous rolling facility suitable for carrying out the method of the present invention.

FIG. 2 is a schematic view showing an example of the operation of the mobile joining device in the continuous rolling facility of the present invention.

FIG. 3 is a schematic view showing an example of the operation of the mobile joining device in the continuous rolling facility of the present invention.

FIG. 4 is a schematic view showing an example of the operation of the mobile joining device in the continuous rolling facility of the present invention.

FIG. 5 is a schematic view showing an example of the operation of the mobile joining device in the continuous rolling facility of the present invention.

FIG. 6 is a schematic view showing an example of the operation of the mobile joining device in the continuous rolling facility of the present invention.

FIG. 7 is a schematic explanatory view showing an example of a pair of blades that can be used in a deburring device suitable for the continuous rolling facility of the present invention.

FIG. 8 is a schematic explanatory view showing an example of the configuration and operation of a retractable roller table suitable for the continuous rolling facility of the present invention.

FIG. 9 is an explanatory view showing an example of a butt state of rough metal materials at the time of joining in a continuous rolling facility.

[Explanation of symbols]

1 Metal base material 2 Simple heating furnace 3 Upstream rolling mill train (rough rolling mill train) 4 cutting machine 5 Metal rough material 6 Standing metal rough material 7 shift device 8 pinch rolls 9 table rolls 91 Support Roll 10 Subsequent metal rough material 11 Leading metal rough 12 Mobile joining device 13 Downstream rolling mill train (intermediate rolling mill train) 14 Downstream rolling mill train (finish rolling mill train) 15 gripping device 15a Transportation 15b Transportation 15c Means of transportation 15d gripping means 16 Joining means 16a Lead metal joining method 16b Joining method for trailing metal rough material 16c Joining condition control means 17 Moving speed control means 18a Moving speed measuring means 18b major roll 19 rolling line 20 waiting line 30 Deburring device 31 pair of cutting tools 31a, 31b cutlery 40 Shape measuring means 41 Imaging device 411 Imager 412 Signal storage unit 413 Image processing controller 50 pinch rolls 90 Retractable roller table 911 Laura 921 apron

Claims (14)

[Claims] 1. A metal raw material is sequentially rolled by a rolling mill train upstream of a rolling line in which a plurality of rolling mill trains are arranged in series to form a metal rough material, and then the preceding metal among the metal rough materials is used. In the continuous rolling method of a metal material, the trailing end of the rough material is joined to the leading end of the following metal rough material, which is then continuously rolled in a row of rolling mills to form a metal finishing material, in which the preceding metal is used. While sandwiching a rough material, it grips the trailing metal rough material and then advances it at a speed higher than the forward speed of the preceding metal rough material, and the trailing metal to the trailing end of the preceding metal rough material. A continuous rolling method for a metal material, characterized in that the leading end of the rough material is abutted and positioned, and the preceding metal rough material and the following metal rough material are joined. 2. After gripping the following metal rough material,
The leading end of the following rough metal material is moved and held so as to be at a predetermined position above the rolling pass line of the downstream rolling mill row, and the rear end of the preceding rough metal material is forward of the predetermined position. 2. After moving to, the tip of the following rough metal material is lowered to the rolling pass line, and then advanced at a speed higher than the forward speed of the preceding rough metal material. Continuous rolling method for metal materials. 3. The joining is carried out by providing a movable joining device capable of reciprocating between the upstream rolling mill row and the downstream rolling mill row, and the pinching is provided in the moving joining device. Performed by the pinch rolls, and the gripping means arranged in the movable joining device performs the gripping, and the subsequent movement of the rough metal material advances the movable joining device and the gripping device. The method for continuously rolling a metal material according to claim 1 or 2, wherein the method is performed by advancing at a speed higher than the advancing speed of the preceding rough metal material. 4. The continuous rolling of a metal material according to claim 3, wherein the forward movement of the movable joining apparatus is adjusted according to the forward movement speed of the preceding rough metal material detected by the pinch roll. Method. 5. The continuous rolling method for a metal material according to claim 1, wherein the joining is joining by flash butt welding. 6. The method for continuously rolling a metal material according to claim 1, wherein the metal material is a linear material or a rod-shaped material. 7. The continuous rolling method for a metal material according to claim 3, wherein the movable joining device is a trolley. 8. A continuous metal rough material obtained by joining an upstream rolling mill train, which sequentially rolls metal blanks into a metal rough material, and a trailing end of a preceding metal rough material and a leading end of a following metal rough material. And a movable joining device that is disposed between the upstream rolling mill row and the downstream rolling mill row and is capable of reciprocating between the upstream rolling mill row and the downstream rolling mill row, and the continuous metal. A downstream rolling mill train that rolls a rough material into a metal finishing material, in a continuous rolling equipment for metal materials sequentially arranged in series, the movable joining device, a pinch roll for sandwiching the preceding metal rough material A continuous rolling facility for metal material, comprising: a gripping device for gripping a rough metal material that follows. 9. The continuous rolling equipment for metal materials according to claim 8, wherein the movable joining device is a trolley. 10. The gripping device comprises gripping means for gripping a trailing metal rough material, and moving means fixed to the gripping means for moving the gripping means. Or the continuous rolling equipment for metal materials according to 9. 11. The moving type joining device has speed control means for controlling the forward speed according to information from the moving speed measuring means of the preceding rough metal material attached to the pinch roll. 8. A continuous rolling facility for metal materials according to any one of 8 to 10. 12. A standby / feeding-out device for waiting / feeding out the rough metal material to be supplied to the mobile joining device is provided between the mobile joining device and the upstream rolling mill train. Item 12. A continuous rolling facility for metal materials according to any one of items 8 to 11. 13. A deburring device for cutting and removing burrs generated at a joint portion of the continuous metal rough material is provided between the movable joint device and the rolling mill row on the downstream side. The continuous rolling facility for metal materials according to any one of 8 to 12. 14. A retractable type that conveys and supports a metal rough material or a continuous metal rough material between at least the rolling mill train at the upstream side and the rolling mill train at the downstream, which is the moving range of the movable joining device. The continuous rolling equipment for metal materials according to claim 8, further comprising a roller table.