JP4744706B2 - Method and equipment for continuous rolling of metal materials - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, after rolling a metal shape material such as a billet into a metal rough material of a predetermined size, the preceding metal rough material and the subsequent metal rough material are joined in the rolling line and continuously rolled. The present invention relates to a continuous rolling method of metal material and its equipment. In the present invention, the “coarse metal material” means a so-called intermediate-stage material after the metal base material is subjected to rolling such as rough rolling.
[0002]
[Prior art]
Conventionally, when manufacturing a long metal material having a predetermined cross-sectional area and shape such as a wire, a bar, and a stripe from a metal shape material such as a bloom or billet, hot rolling can be applied to these metal shape materials. Has been done. Hot rolling is a method in which a metal shape heated to a high temperature or a high-temperature metal shape obtained by continuous casting is rolled into a metal material having a desired size and shape.
[0003]
By the way, in such a hot rolling, a finite-length metal shape material is sequentially rolled one by one. In so-called batch rolling, one metal shape material is rolled and then the next metal shape shape. There is a time interval before the rolling of the material, and there is a case where a part of the metal raw material or the rough metal after the rough rolling has to be placed on the floor to stand by. For this reason, there has been a problem that the temperature reduction of the metal base material and the metal rough material is inevitable, and when these are rolled, reheating is required.
[0004]
To solve such a problem, for example, Japanese Patent Application Laid-Open No. 10-5803 discloses a so-called continuous rolling method. The technique described in Japanese Patent Application Laid-Open No. 10-5803 is a technique in which a plurality of materials (raw materials) are sequentially rolled in the first rolling mill row, and the traveling welder is moved while being synchronized with the movement of the materials. However, the process of connecting the rear end of the preceding material and the front end of the subsequent material by flash butt welding to form a continuous material, the grinding process to remove burrs from the welded portion of the continuous material, and the continuous material further downstream A continuous rolling method between the rolling mills, comprising a step of continuously rolling in a second rolling mill row disposed in the rolling mill.
[0005]
[Problems to be solved by the invention]
In the technique described in Japanese Patent Laid-Open No. 10-5803, as described above, the traveling type welding machine is moved while being synchronized with the movement of the preceding material, and the trailing edge of the preceding material and the leading edge of the succeeding material are used. The process of connecting the two by flash butt welding is an essential requirement. However, when the present inventors repeated various trials, it has been found that there is a serious problem in the synchronous movement method of the bonding apparatus that synchronizes with the movement of such a material.
[0006]
In other words, it is difficult to measure the exact moving speed of the material moving between heat, or it requires extremely expensive measuring equipment, and even if the accurate moving speed of the material can be measured, welding It is difficult to follow the moving speed of the preceding material with a large weight truck with the machine accurately in a short time, or a complicated and expensive control mechanism is required.
[0007]
If the synchronization is insufficient, the joining point does not fall within the optimum position range of the electrode that grips the preceding material and the electrode that grips the succeeding material. The present inventors have found that problems such as insufficient strength of the joint and defective shape occur, and in extreme cases, joining may not be possible.
The present invention has been made to solve the above-described problems of the prior art. During continuous rolling of a metal material, the preceding material (metal coarse material) and the subsequent material (metal coarse material) are joined. It is an object of the present invention to propose a continuous rolling method and equipment for a metal material that can be positioned in a very simple and reliable manner and can be stably rolled with high productivity.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned problems, the present inventor has intensively studied a method for aligning a preceding material (metal rough material) and a subsequent material (metal rough material) at the time of joining, and is extremely simple and reliable. I found a method of positioning at the time of joining.
The present invention has been completed based on the above findings and further studies. That is, according to the first aspect of the present invention, the metal raw material is sequentially rolled in a rolling mill row upstream of a rolling line in which a plurality of rolling mill rows are arranged in series to obtain a rough metal material. In the continuous rolling method of a metal material, the rear end of the preceding metal coarse material is joined to the tip of the subsequent metal coarse material, and rolled continuously in a downstream rolling mill row to obtain a metal finish. Grasp the subsequent metal rough material, and then move and hold the leading edge of the subsequent metal rough material so as to be in a predetermined position above the rolling pass line of the downstream rolling mill row, and the preceding After the rear end of the coarse metal material has moved forward from the predetermined position, the leading edge of the subsequent coarse metal material is lowered to the rolling pass line, and then at a speed exceeding the advance speed of the preceding coarse metal material. The leading edge of the following metal rough is advanced to the trailing edge of the preceding metal rough Is a continuous rolling method of a metal material characterized in that the preceding metal coarse material and the following metal coarse material are joined.
[0010]
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 gripping is performed by the movable joining. The advancement of the following metal coarse material is performed at a speed exceeding the advance speed of the preceding metal coarse material by the advancement of the mobile joining device and the advancement of the gripping means. It is preferable to carry out.
[0011]
In the first aspect of the present invention, the joining is preferably a joining by flash butt welding, and in the first aspect of the invention, the metal material is preferably a linear material or a rod-shaped material, In the first aspect of the present invention, the mobile joining device is preferably a carriage.
The second aspect of the present invention is a continuous metal that joins an upstream rolling mill row that sequentially rolls metal shapes into a metal coarse material, and a rear end of the preceding metal coarse material and a front end of the subsequent metal coarse material. A mobile 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, as a rough material, In the continuous rolling equipment of the metal material in which the downstream rolling mill row that rolls the continuous metal rough material to form the metal finish is sequentially arranged in series, the mobile joining device grips the subsequent metal rough material. It has a gripping device, and further, a continuous rolling equipment of the metal material, characterized in that have a speed control means for controlling the forward speed based on information from the moving speed measuring device of the preceding metal coarse material. In the second aspect of the present invention, the mobile joining device is preferably a carriage, and in the second aspect of the present invention, the gripping device includes a gripping means for gripping a metal rough material that follows. It is favored arbitrary to have a moving means for being fixed to gripping means and movable gripping means.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described.
In FIG. 1, an example of the continuous rolling equipment of the metal material suitable for implementation of the method of this invention is shown.
In the present invention, the metal shaped material is rolled into a metal finish (product) using a plurality of rolling mill rows arranged in series. A metal shaped material (billet) 1 directly sent from a continuous casting machine (not shown) or heated by a heating furnace 2 is roughened by an upstream rolling mill row (rough rolling mill row) 3 of a plurality of rolling mills. Rolled to obtain a metal rough material 5. The rough metal is then rolled by a downstream rolling mill row (intermediate rolling mill row) 13 and then finish-rolled by a further downstream rolling mill row (finish rolling mill row) 14 as necessary to obtain a metal finish of the product. It is said.
[0013]
In the present invention, the mobile joining device 12 is disposed between the upstream rolling mill row 3 and the downstream rolling mill row 13. This mobile joining device 12 joins the leading end of the following metal coarse material 10 to the rear end of the preceding metal coarse material 11, and continuously in the downstream rolling mill row 13, and if necessary, in the downstream rolling mill row 14. Rolling.
In addition, it is preferable to adjust the end face to a shape suitable for joining by cutting the leading end and the trailing end of the metal rough materials 10 and 11 to be joined by the cutting machine 4 when leaving the upstream rolling mill row 3. As the cutting machine 4, a crop shear or a traveling saw cutter can be preferably used.
[0014]
A mobile joining device 12 for joining the leading end of the preceding metal rough material 11 and the leading end of the following metal rough material 10 is disposed so as to be capable of reciprocating between the upstream rolling mill row 3 and the downstream rolling mill row 13. Is done. For this reason, the mobile joining device 12 is preferably a cart. The moving means (not shown) of the mobile joining apparatus 12 is a self-propelled system that drives a wheel or a pinion by a motor mounted on the mobile joining apparatus 12 (in this case, a rack and pinion system), or is provided outside. Any method such as a passive movement method using a cylinder may be used.
[0015]
The reciprocation between the upstream rolling mill row 3 and the downstream rolling mill row 13 does not necessarily mean only a linear motion. For example, during joining, the preceding metal coarse material and the following metal are moved in the rolling line. Although it moves along the conveying direction of the coarse material, the return may be moved away from the rolling line.
Further, the joining in the present invention is not particularly limited as long as a strong joining can be obtained in a short time, but flash butt welding is the most preferred joining method that meets this purpose. In addition, there is no problem as an induction heating welding method using a coil.
[0016]
Further, when the mobile joining device 12 is traveling on a rolling line, the support rolls 91 constituting the roller table 9 that conveys and supports the metal coarse material are sequentially placed at positions that do not interfere with the mobile joining device 12. It is preferable to enable retraction.
The mobile joining device 12 of the present invention is characterized by having a gripping device for gripping the subsequent metal rough material together with the joining means.
[0017]
An outline of the mobile joining device 12 is shown in plan view in FIG. FIG. 2 shows the case where the mobile joining device 12 has returned to the position closest to the upstream rolling mill row 3. In the figure, 15 is a gripping device, 16 is a joining means, 10 is a subsequent metal coarse material, 11 is a preceding metal coarse material, 19 is a rolling line, and 20 is a standby line.
The gripping device 15 fixed to the mobile joining device 12 has a gripping means 15d and moving means 15a to 15c. The following metal coarse material 10 is grasped by the gripping means 15d, and the leading end of the subsequent metal coarse material 10 is moved to a predetermined position in the rolling line 19 by the moving means 15a to 15c fixed to the gripping means 15d. Can be held. The trailing metal coarse material 10 is preferably placed on standby in the standby line 20 with its tip positioned at a predetermined position, whereby the leading edge of the trailing metal coarse material 10 gripped by the gripping means 15d is It can be moved and held at a predetermined position in the mobile joining device 12 easily and accurately. At this time, the waiting metal coarse material 10 in standby may be kept in a stretched state (that is, not bent), or may be bent by a looper and kept in standby.
[0018]
Further, the joining means 16 installed in the mobile joining device 12 has joining gripping means 16a and 16b, each of which holds the preceding metal coarse material and the following metal coarse material, and the end face of the metal coarse material Join them together to obtain a continuous metal rough material. FIG. 2 shows a case where the joining method is flash butt welding, and the gripping means 16a and 16b for joining are clamp-type electrodes that also serve as electrodes. In the present invention, the joining method is not limited to this, and there is no problem even as an induction heating welding method. In the case of the induction heating welding method, the joining gripping means 16a and 16b need only be a clamping mechanism, and it is necessary to arrange a coil at the joining position.
[0019]
In the method of the present invention, it is preferable to perform bonding using the mobile bonding apparatus 12 described above. First, the subsequent metal rough material is gripped by the gripping means 15d of the gripping device 15, and as shown in FIG. 3, the leading end of the subsequent metal rough material 10 is preferably connected to the rolling pass line of the downstream rolling mill row. It is moved and held by the moving means 15b of the gripping device 15 so as to be in a predetermined upper position.
[0020]
FIG. 3 shows a situation in which the leading end of the subsequent metal coarse material 10 is positioned on the mobile joining device 12. 3A is a schematic plan view, and FIG. 3B is a schematic side view. Like the flash butt welding or induction heating welding (or pressure welding), the predetermined length of the material to be joined (metal rough material) is clamped by the clamp type electrodes 16a and 16b, or surrounded by a coil (not shown). When it is necessary to perform the positioning, it is preferable that the gripping device 15 performs positioning by projecting the leading end of the subsequent metal coarse material 10 forward by a predetermined length.
[0021]
Such positioning of the subsequent metal coarse material 10 is preferably performed while the rear end of the preceding metal coarse material 11 is in the mobile joining device 12. This is because, in the present invention, it is necessary to quickly abut the leading end of the subsequent metal coarse material 10 held by the grasping device 15 of the mobile joining device 12 against the rear end of the preceding metal coarse material 11. It is. Therefore, as shown in FIG. 3 (b), the leading end of the subsequent metal coarse material 10 is located above the rolling pass line, and the leading end of the subsequent metal coarse material 10 is the rear end of the preceding metal coarse material 11. Then, it is positioned by a gripping device 15 at a predetermined position which is an optimal position for joining, and is held and waited.
[0022]
After the rear end of the preceding metal coarse material 11 has moved forward, the moving joining device 12 is advanced, and the following metal coarse material 10 is moved from the position where it is held on standby as shown in FIG. Immediately descend into the rolling line.
The mobile joining device 12 is advanced to a speed that approximately matches the forward speed of the preceding metal coarse material 11. On the other hand, as shown in FIG. 5, the metal coarse material 10 is advanced by the moving means 15a so that the leading edge of the subsequent metal coarse material 10 abuts the rear end of the preceding metal coarse material 11. At this time, the total speed of the forward speed of the mobile joining device 12 and the forward speed of the moving means 15a is set to exceed the forward speed of the preceding metal coarse material 11. At the point of contact, positioning is performed, and as shown in FIG. 6, the preceding metal coarse material 11 is clamped and joined by the joining means 16a and the subsequent metal coarse material 10 is joined by the joining means 16b. As shown in FIG. 5, the leading edge of the subsequent metal coarse material 10 is gripped in advance at an optimum position for joining, and therefore, the rear end of the preceding metal coarse material 11 and the subsequent metal coarse material 10 are necessarily formed. The tip of the end faces at a position optimal for joining, and appropriate joining becomes possible. 6A is a schematic plan view, and FIG. 6B is a schematic side view.
[0023]
The mobile joining device of the present invention preferably has speed control means for controlling the forward speed. It is preferable to adjust the speed control means to an appropriate speed that approximately matches the moving speed of the preceding metal coarse material. The moving speed of the preceding metal coarse material 11 may be measured by the measuring speed 18 or the peripheral speed of the rolling roll or other moving speed measuring means. In such a measurement method, a certain amount of error is inevitable, but in the case of the present invention, the subsequent metal coarse material 10 is advanced at a sufficiently high speed by the moving means 15a provided in the gripping device 15, and the error is estimated. Since the subsequent metal material 10 only needs to be moved at a faster speed, the problem of difficulty in synchronization as in the prior art does not occur. It is preferable to input information on the moving speed of the preceding metal coarse material from the moving speed measuring means to the speed control means to control the forward speed of the mobile joining device.
[0024]
Note that, when the leading edge of the subsequent metal rough material hits, a force acts in the rolling direction at the rear end of the preceding metal rough material, but as shown in FIG. The force is absorbed by the bending of the metal coarse material in a free state until entering, and positioning is not hindered.
When the joining is performed by flash butt welding, the preceding metal coarse material joining means 16a in FIG. 6 may also serve as an electrode. Further, the subsequent metal coarse material 10 is clamped by the joining means 16b which also serves as an electrode at the time of joining. After the clamping is completed, current is applied between the rear end of the preceding material and the front end of the subsequent material, and flash butt welding is performed. In the case of high-frequency induction heating, the joint is heated and melted by welding with a coil (not shown).
[0025]
When the joining is completed, the gripping by the joining means 16 is released and the metal coarse material (rolled material) is made free, and then the mobile joining device 12 moves back to the movement start point and starts preparation for the next joining.
As described above, the most characteristic point of the present invention is that the leading end of the subsequent metal coarse material is positioned at a predetermined position in the mobile bonding apparatus by the subsequent metal coarse material gripping device provided in the mobile bonding apparatus. The leading edge of the following metal rough material is abutted against the rear end of the preceding metal rough material by moving the mobile joining device at a speed exceeding the advance speed of the preceding metal rough material. Positioning and joining.
[0026]
In addition, as a metal shape material in this invention, the bloom, billet, etc. which become processing raw materials, such as a linear material, a rod-shaped material, and a mold material, are suitable. Moreover, the metal material manufactured by the continuous rolling method of this invention is a linear material, a rod-shaped material, a mold material, etc., and especially a linear material, a rod-shaped material, etc. are preferable. The metal is most commonly steel, but is not particularly limited to this, and may be a copper alloy, an aluminum alloy, or the like.
[0027]
【Example】
The deformed bar was continuously rolled using the continuous rolling equipment shown in FIG.
A billet (120 mmφ) having a composition component of SD24 steel was used as a metal shape material, and a rough metal rolling bar (upstream rolling mill row) 3 was used as a metal rough material of 45 mmφ. Among the obtained metal coarse materials, the rear end of the preceding metal coarse material is joined to the tip of the subsequent metal coarse material in the rolling line by the mobile joining device 12 of the present invention, and the continuous metal coarse material is joined. The material was continuously rolled in a downstream rolling mill row (intermediate rolling mill row, finishing rolling mill row) 13 to obtain a 15 mmφ deformed bar steel.
[0028]
The joining method was flash butt welding joining. In joining, using the mobile joining device 12 of the present invention, after gripping the subsequent metal rough material 10, the leading end of the subsequent metal rough material is located above the rolling pass line, and the optimum position for joining. It was moved and held to a predetermined position. After that, after the rear end of the preceding metal coarse material has moved forward from the predetermined position described above, the leading end of the subsequent metal coarse material 10 is lowered to the rolling pass line, and then preceded by the mobile joining device 12 The metal coarse material 11 was advanced at a speed 20% higher than the advance speed of the metal coarse material 11, and the leading end of the metal coarse material 10 that followed the metal rough material 11 was abutted, followed by clamping, energization, and welding joining.
[0029]
In this manner, 50 metal rough materials were joined and continuously rolled, but there was no joint failure and the rolling could be completed. At this time, the number of the metal base material and the metal rough material placed on the floor was zero.
In addition, after the rolling, a tensile test was performed on each joint, and all showed a strength equal to or higher than the base material strength.
[0030]
Moreover, as a comparison, the batch rolling which rolled one by one was performed without joining metal coarse materials. At that time, due to the rolling interval in the intermediate rolling mill row, it was necessary to place eight metal rough materials on the floor, and these floor materials had to be heated again and rolled.
[0031]
【The invention's effect】
As described above in detail, according to the present invention, the movement position of the movable joining device such as the joining cart is performed without advanced control, and the butt position between the preceding material and the following material is always optimal for joining. Bonding can be performed at a stable position, a stable shape and a high-strength bonding portion can be stably obtained, and there are remarkable industrial effects such as improvement in yield and production efficiency.
[Brief description of the 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 equipment 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 equipment 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 equipment 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 equipment 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 equipment of the present invention.
[Explanation of symbols]
1 Metal Shape 2 Simple Heating Furnace 3 Upstream Rolling Machine Row (Rough Rolling Machine Row)
4 Cutting machine 5 Metal rough material 6 Metal rough material in standby 7 Shift device 8 Pinch roll 9 Table roll
91 Support roles
10 Rough metal rough
11 Leading metal rough
12 Mobile joining device
13 Downstream rolling mill row (intermediate rolling mill row)
14 Downstream rolling mill row (finish rolling mill row)
15 Gripping device
15a Transportation means
15b Transportation means
15c Transportation means
15d gripping means
16 Joining means
16a Joining method for pre-metal coarse material
16b Joining means for rough metal
17 Movement speed control means
18 Major roles
19 Rolling line
20 Standby line

Claims (8)

After the metal raw material is sequentially rolled into a metal rough material in a rolling mill row upstream of a rolling line in which a plurality of rolling mill rows are arranged in series, the rear end of the preceding metal rough material among the metal rough materials In the continuous rolling method of a metal material, the subsequent metal rough material is gripped by joining to the tip of the subsequent metal rough material and then rolling continuously in a downstream rolling mill row to obtain a metal finish. Thereafter, the leading end of the subsequent metal rough material is moved and held so as to be in a predetermined position above the rolling pass line of the downstream rolling mill row, and the rear end of the preceding metal rough material is After moving forward from a predetermined position, the leading edge of the subsequent metal coarse material is lowered to the rolling pass line, and then advanced at a speed exceeding the advance speed of the preceding metal coarse material, and the preceding metal coarse material is advanced. Position the trailing edge of the following metal rough material against the trailing edge of the material. , Continuous rolling method of a metal material, characterized by joining the metal coarse material to the trailing metal coarse material to the preceding. 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 gripping is performed by gripping means disposed in the mobile joining device. The forward movement of the metal coarse material is performed by advancing at a speed exceeding the advance speed of the preceding metal coarse material by advance of the mobile joining device and advance of the gripping means. The continuous rolling method of the metal material of 1 . The method of continuous rolling of a metal material according to claim 1 or 2, wherein the joining is joining by flash butt welding. The method for continuously rolling a metal material according to any one of claims 1 to 3 , wherein the metal material is a linear material or a rod-shaped material. The continuous rolling method for a metal material according to any one of claims 2 to 4 , wherein the mobile joining device is a carriage. The upstream upstream rolling mill row that sequentially rolls the metal raw material to form a metal coarse material, and joins the rear end of the preceding metal coarse material and the tip of the subsequent metal coarse material to form a continuous metal coarse material. A movable joining device disposed between the rolling mill row and the downstream rolling mill row, and capable of reciprocating between the upstream rolling mill row and the downstream rolling mill row, and rolling the continuous metal coarse material a downstream rolling mill train to metal coverings, in a continuous rolling mill of sequentially arranged in series metallic material, wherein the movable joint device, have a gripping device for gripping the metal coarse material to trailing, further preceding metal coarse material of the continuous rolling equipment of the metal material, characterized in that have a speed control means for controlling the forward speed based on information from the moving speed measuring unit. The metal material continuous rolling equipment according to claim 6 , wherein the mobile joining device is a carriage. 8. The gripping device according to claim 6 or 7 , wherein the gripping device includes gripping means for gripping a subsequent metal rough material, and moving means fixed to the gripping means and capable of moving the gripping means. Continuous rolling equipment for metal materials.

Images