JPH0433704A - Method and device for joining metal plate in hot rolling - Google Patents

Abstract

PURPOSE:To improve productivity by forming projecting and recessing shapes which are mutually engaged on the joint surfaces of the rear end part of a 1st material and the front end part of a 2nd material, cutting the unnecessary part of the tip and rear end part of the above-mentioned materials by adding shearing force and, next, pressurizing the projecting and recessing shapes after they are overlapped by engaging. CONSTITUTION:The rear end part of a rolled stock 1 and the front end part of a rolled material 2 are overlapped and that overlapped part is placed between two sets of dies 3, 4 and 5, 6. Next, this overlapped part is pressed with the two sets of dies and the projecting and recessing shapes which are composed of plural longitudinal grooves which are corresponded to the projecting and recessing shapes of the dies 4, 6 and which are engaged each other are formed on the upper and lower surfaces of the overlapped part. The two sets of dies 3, 4 and 5, 6 are moved vertically and relatively, shearing force is added at the same time pressing is completed and two plates of the overlapped part are simultaneously cut. By utilizing the die 4 and die 6 as a shear, the necessary parts 1a, 2a of the nose parts of each rolled stock are cut off. Next, the overlapped part is placed between the presses 7, 8 of which both of the top and bottom are flat and both rolled stocks are joined by pressurizing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for joining plate materials in hot rolling, and in particular to a plate material suitable for continuous hot rolling that is placed on the entry side of a finishing rolling mill. The present invention relates to a joining method and apparatus, and hot rolling equipment.

[Conventional technology]

Continuous hot finish rolling has an extremely large effect as described below. First of all, it is advantageous to have a roll with a large diameter in order to ensure good bite during sheet threading, and for this reason conventionally rolls with a large diameter were used, but it is necessary to take this into account. This allows the use of smaller diameter rolls. As a result, the rolling load can be reduced, the rolling mill itself can be downsized, and equipment costs can be reduced. Secondly, in hot rolling, the use of lubricating oil is being considered to reduce roll wear and rolling load, but in order to eliminate the problem of biting during sheet rolling, apply a sufficient amount of oil. become able to. Thirdly, even in hot rolling, it becomes possible to apply tension to the material and roll it, which also makes it possible to reduce the rolling load. That is, in discontinuous rolling, there is no tension at the front and rear ends of the material, and these parts are off-gauge.

In order to achieve such continuity, it is important to join the materials quickly and reliably on the input side before feeding them into the rolling mill.

Conventionally, in cold rolling, the plate thickness at the entry side of a cold tandem rolling mill was about 2 to 3 mm, and materials were joined by welding for continuous rolling. However, in hot rolling, since the plate thickness is as large as about 30 mm, a huge amount of energy is required for welding, and the welding time is also long, so joining by welding is not practical. For this reason, in hot rolling, various methods have been studied in which the leading and trailing ends of the materials are overlapped and joined by pressing or rolling.

First, Japanese Patent Application Laid-Open No. 57-159281 discloses a method in which the joining surfaces of the leading and trailing ends of materials are simply overlapped and pressed. Furthermore, Japanese Patent Application Laid-Open No. 58-86989 discloses a method in which the joint surfaces of the front and rear ends of the material are formed into a key-shaped uneven shape with grooves in the width direction, and the uneven shapes are engaged and pressed. , Japanese Patent Application Laid-Open No. 61-212488,
A method has been proposed in which a caliber roll with unevenness on the roll surface is used to form an uneven shape with a plurality of longitudinal grooves that engage with each other on the joint surface of the leading and trailing ends of the material, and the uneven shapes are interlocked and stacked, and then pressed. ing.

[Problem to be solved by the invention]

However, the conventional method has the following drawbacks.

In the method of simply overlapping and pressing as seen in Japanese Patent Application Laid-open No. 57-159281, the bonding surface needs to be long enough to ensure reliable bonding, which increases waste and reduces yield. Further, the thickness of the overlapped portion must be reduced to approximately the thickness of one sheet, but it is difficult to reduce the thickness only by pressing, and it is necessary to cut with a slicing machine or the like. Since cutting requires a considerable amount of time, this method is not preferable from this point of view as well.

JP-A-58-86989 and JP-A-61-212
As described in Japanese Patent No. 488, interlocking the bonding surfaces with uneven shapes is effective in improving yield and bonding strength. However, there is another problem in this case.

The joining equipment is installed between the rough rolling mill and the finishing rolling mill of the hot rolling line, where the roughly rolled bar material is joined by this equipment and then continuously sent to the finishing rolling mill. The front and rear ends of such bar materials are shaped like a so-called fishtail, and in order to make the ends into rectangular shapes suitable for joining, additional shearing is required in the previous process.

That is, the shear and the joining device are arranged between the rough rolling mill and the finishing mill. Therefore, the number of steps required to complete joining of the bar materials after rough rolling increases, and the processing time required for joining increases. In hot rolling, the treatment time is preferably short from the viewpoint of temperature reduction. Furthermore, there is also the problem that the amount of equipment increases due to the arrangement of the shear and the bonding device.

In summary, the conventional technology has problems such as a decrease in yield, a decrease in bonding strength, and an increase in processing time and amount of equipment.

The purpose of the present invention is to provide a method and apparatus for joining plate materials in hot rolling, which can solve the above-mentioned problems, reduce the decrease in yield, allow materials to be joined reliably in a short time, and minimize an increase in the amount of equipment, as well as a thermal Our goal is to provide inter-rolling equipment.

[Means for solving problems]

In order to achieve the above object, the present invention provides a plate joining method in hot rolling in which the rear end of a first material and the front end of a second material are overlapped and pressed to join. An uneven shape that engages with each other is formed on the joint surface of the rear end portion and the joint surface of the front end of the second material, and at the same time, shearing force is applied to cut unnecessary parts of the front and rear ends of the material, and then the uneven shape is bitten. They are stacked together and pressed together.

Preferably, the uneven shape is a plurality of longitudinal grooves that engage with each other.

Preferably, at least one of the longitudinal groove width and the groove depth in the uneven shape is changed in the board width direction.

Further, in order to achieve the above object, the present invention provides a plate joining apparatus for hot rolling that overlaps and presses the rear end of a first material and the front end of a second material to join them. a first device that forms an uneven shape on the bonding surface of the rear end of the material; and a first device that is disposed close to the first device and forms a concavo-convex shape on the bonding surface of the tip of the second material. a second device that forms an uneven shape that engages with the uneven shape; and a second device that moves the first device and the second device in a vertical direction relative to each other and imparts a shearing function to the first and second devices. 3 device and
and a fourth device that presses the first and second materials after the concavo-convex shapes are overlapped.

Preferably, said first and second devices each include a die forming a plurality of interlocking longitudinal grooves as a relief shape in said first and second materials.

Preferably, the fourth device includes a pair of press members for pressing the first and second materials, and each of the press surfaces of the press members is spaced apart from the corresponding material surface by at least the length of the material. It has a tapered surface that is inclined in the direction of

Furthermore, in order to achieve the above object, in the present invention,
A hot rolling facility is provided in which the plate joining device is arranged on the entry side of a hot finishing mill.

[Effect]

Since the first and second materials are bonded by forming an uneven shape on the bonding surfaces, interlocking and overlapping the uneven shapes, and pressing, it is possible to perform reliable bonding with little reduction in yield. In addition, by applying shearing force at the same time as forming the uneven shape and cutting unnecessary parts at the leading and trailing ends of the material, the shear that was conventionally installed at the front stage of the joining process is no longer required, reducing joining time and reducing the amount of equipment required. is reduced.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of the joining method will be described with reference to FIGS. 1 and 2.

In FIG. 1, two sets of dies 3, 4 and 5, 6 are arranged close to each other across the moving path of the rolled materials 1, 2 to be joined, and one set of dies 3, 4 is placed in the lower die. 3 is an uneven die, the upper die 4 is a flat die, and the other set of dice 5.6 is an uneven die, and the lower die 6 is a flat die. shall be. The concave and convex shapes provided on the dies 4 and 6 are in the form of a plurality of longitudinal grooves that engage with each other.

First, in FIG. 1(a), the rear end of the rolled material 1 and the front end of the rolled material 2 are overlapped, and the overlapped portion is placed between the two sets of dies 3, 4 and 5, 6. do. Next, as shown in FIG. 1(b), the overlapped part of the rolled materials 1 and 2 is pressed with two sets of dies 3, 4 and 4, 5, and the dies 4 and 6 are pressed on the upper and lower surfaces of the overlapped part. A concavo-convex shape consisting of a plurality of longitudinal grooves that engage with each other is formed as shown in FIG. 2, which corresponds to the concavo-convex shape. At the same time as pressing is completed, the two sets of dies 3, 4, and 5.6 are moved relative to each other in the vertical direction to apply shearing force and simultaneously cut the two sheets in the overlapped portion, as shown in FIG. 1(c). . That is, dice 4
and use dice 6 as a shear. As a result, an uneven shape is formed on the rolled material, and at the same time, unnecessary portions 1a at the tips of each rolled material are formed.

2a is cut.

Next, the cut unnecessary parts 1a and 2a are removed and the uneven shapes of the rolled materials 1 and 2 are interlocked and overlapped, and then the parts are pressed into a press 7.8 with both the top and bottom flat as shown in FIG. 1(d). The two are pressed together until the thickness of the overlapped portion becomes approximately the thickness of one sheet. press 7
．． 8 may be a rolling mill having upper and lower horizontal rolls.

According to the joining method of this embodiment, the following effects can be obtained. The location where rolled material 1.2 is joined is between the rough rolling mill and the finishing mill of the hot rolling line, where the roughly rolled bar material is joined by this method and then continuously fed to the finishing mill. . The front and rear ends of such bar materials are shaped like a so-called fishtail, and the bar materials cannot be joined with the end shapes as they are. For this reason, conventionally, in order to make the end shape of the bar material into a rectangular shape suitable for joining, a shear was further installed in a process prior to joining. According to this embodiment, since the unnecessary portions of the leading and trailing ends of the material are cut off at the same time as the uneven shape is formed, a shear is not required, the joining time can be shortened, and the equipment can be made more compact. Furthermore, since the joining time is short, there is no need to lower the rolling speed during joining, and productivity can be improved.

Further, in this embodiment, the joint surfaces of the rear end of the rolled material 1 and the front end of the rolled material 2 are machined into a longitudinal groove shape and are engaged with each other. Conventionally, there is a third method for joining using uneven shapes.
As shown in Figure (a), there is a method in which the joint surfaces of the front and rear ends of materials 1 and 2 are formed into a key-shaped uneven shape with grooves in the width direction, and the uneven shapes are engaged and pressed. The uneven shape of this embodiment can improve the bonding strength compared to this conventional method.

That is, in the conventional joining method, since grooves are provided in the width direction, the thickness of the part A in Fig. 3(a) becomes small, and it also becomes a stress concentration area, making it weak against tensile force in the longitudinal direction. . For this reason, rolling with tension applied is not possible, and the advantages of continuous rolling cannot be fully utilized. In addition, when rolling is used as a pressing means after meshing, the surface layer is likely to be stretched in such a state of meshing, while the inner layer is difficult to stretch. Gaps are likely to form, reducing bonding strength.

On the other hand, with the groove shape in the longitudinal direction as in this example, the plate thickness (cross-sectional area of the plate) at the portion corresponding to section A in Fig. 3 is larger than that in the method shown in Fig. 3, and the strength is reduced. It is advantageous for Furthermore, since the groove is shaped in the longitudinal direction, the contact area of the joint surface is also increased. Furthermore, even when pressing is applied after engagement, a gap is created on the joint surface consisting of longitudinal grooves, whereas the surface pressure increases due to the widening of the material, resulting in a stronger joint state. That is, when these portions are pressed, the width of the groove-like protrusions increases, which increases the contact pressure of the engaging surfaces, promoting the crimping action between the materials. Furthermore, the joining surface is deformed due to the width expansion, and a mechanical joining action also occurs. Due to these synergistic effects, the rolled materials 1 and 2 are firmly connected.

Therefore, since the tensile strength of the plate joint is high, a large tension can be applied during rolling, and the rolling load can be reduced. This makes it possible to downsize the rolling mill and lead to a reduction in equipment costs.

The shape of the groove is not limited to the shape illustrated in FIG. 2, and various other shapes are possible. FIG. 4 shows a sectional view of another groove shape. Generally, the material will flow sideways at the edge of the plate, so it is not expected that the contact pressure on the mating surfaces will increase much due to the width expansion. Therefore, as shown in FIG. 4(a), the shape of the groove is changed in the width direction of the plate, and the width of the groove is made smaller at the edge of the plate to increase the contact area between the two materials. Of course, the depth of the groove may be varied in the width direction as shown in FIG. 4(b), or both the width and depth may be varied. In addition, although the cross-sectional shape of the groove is drawn as a rectangle in the figure, when the groove is formed using a press or the like, it will not be a perfect rectangle and will have a shape with rounded corners. This is not contrary to the spirit of the present invention. Furthermore, it goes without saying that the number of grooves can be arbitrarily selected.

Furthermore, the cross-sectional shape of the groove is not necessarily rectangular, and FIGS.
As illustrated in (C), various shapes such as a triangle, a trapezoid, and a curved shape are possible. Further, when mating, it is not necessarily necessary to completely match the parts without any gaps, and even if there are some gaps, they can be brought into close contact by expanding the width when pressed.

Furthermore, in this embodiment, it is also possible to join rolled materials having different widths. In this case, since the longitudinal grooves are engaged with each other, the rolled material does not shift in the width direction, and there is an advantage that the center lines can be easily aligned.

Next, an embodiment of a bonding apparatus for carrying out the above bonding method will be described with reference to FIGS. 6 to 10.

The joining device of this embodiment uses the above-mentioned dies 3, 4 and 5, 6.
It consists of a forming and cutting device with a press 7.8 and a pressing device with the press 7.8 mentioned above.

FIG. 6 shows the part of the forming and pressing device with the die 3.4. In FIG. 6, the die 4 has two pillars 9 and 1.
One end of the die 3 is fixed, and the die 3 can slide up and down using this support as a guide. Post 9,1
A block 11 is fixed to the other end of the die 3, and a hydraulic cylinder 12 is provided to apply a pressing force to the die 3. Furthermore, the die 4 can slide up and down using a support column 14.15 fixed at one end to the base 13 as a guide, and a block 16 fixed to the other end of the support column 14.15 is equipped with a hydraulic cylinder. 17 is provided, and the die 4 is moved by this hydraulic cylinder 17.
A shear force is applied to the

The device part equipped with dies 5 and 6 has a structure as shown in Fig. 7, which is an upside-down version of Fig. 6, with columns 18 and 19 fixed at one end to die 6, and fixed to the other end of the column. a hydraulic cylinder 21 that applies a pressing force to the block 20 , a hydraulic cylinder 21 that applies pressing force to the die 5 , pillars 22 and 23 on which the die 6 slides and whose ends are fixed to the base 13 and block 16 , and the base 1
Hydraulic cylinder 2 is provided at 3 and applies shearing force to the die 6.
It is equipped with 4.

First, apply oil pressure to the hydraulic cylinder 12.21 and press the die 3
Then, the rolled materials 1 and 2 are formed with an uneven shape using the die 5, and then hydraulic pressure is sent to the hydraulic cylinders 17 and 24, and the dies 4 and 6 cut both materials.

In the above structure, the dies 3, 4 and the hydraulic cylinder 1
2 constitutes a first device for forming an uneven shape on the joint surface of the rear end of the rolled material 1, and a die 5゜6 and a hydraulic cylinder 21 are arranged close to the first device, and Material 2
A second device is configured to form a concavo-convex shape that meshes with the concave-convex shape of the rolled material 1 on the joint surface of the tip of the hydraulic cylinder 1.
7 and 24 are third devices that relatively move the first device and the second device in the vertical direction and impart a shearing function to the first and second devices, that is, the dies 4 and 6; Configure.

Note that when cutting the rolled materials 1 and 2 with the dies 4 and 6, one of the dies 4 and 6, for example, the die 6, may be fixed.

The structure in this case is shown in FIG.

That is, the dice 6 are directly fixed to the base 13.

The construction is shown in FIG. 9 with a press 7.8 used for pressing after engagement. The press 7゜8 can be moved up and down using pillars 27.28, which are fixed at both ends to the upper and lower bases 25.26, as a guide, and press force is applied to the mated materials 1.2 by hydraulic cylinders 29.30. Add. i.e. press 7.8 and hydraulic cylinder 29.3
0 constitutes a fourth device that presses the rolled materials 1 and 2 after overlapping the uneven shapes. Again, the lower press 8 may be fixed, the cylinder 30 may be omitted, and the press 8 may be directly attached to the base 25.

The shape of the press surface of the press 7.8 is not limited to a completely flat shape, but may also have a shape having a tapered surface on the material end surface side in a direction away from the material surface, as shown in FIG. This makes it easier to remove scale during pressing. Further, the pressing surface may be formed into a curved shape, and any pressing surface shape can be selected.

FIG. 11 shows a hot rolling facility incorporating the above-described joining device. Here, 31 to 37 are finish rolling stands, and the joining device 41 of this embodiment is installed on the entry side thereof. Plates manufactured by a rough rolling mill or continuous casting machine (not shown) are joined by a joining device 41, and are continuously sent to finishing rolling stands 31-37. A shear 38 is installed on the exit side of the finishing rolling stand, detects the joint on the entry side, and cuts it again. The cut plates are wound up alternately by take-up reels 39,40.

In addition, in the case of the above-mentioned joining method, there is of course a metallic joining part, but it is mainly a mechanical joining. Therefore, there is no particular need for equipment for removing scale from the materials or for reheating them when mating, and from this point of view as well, equipment costs can be reduced.

Of course, it goes without saying that if these steps are carried out, the metallic bond will become even stronger, which is preferable.

Although several embodiments of the present invention have been described above, the present invention is not limited thereto, and various applications are possible without departing from the spirit of the present invention.

〔Effect of the invention〕

According to the present invention, since an uneven shape is formed on the material and shearing force is applied at the same time to cut it, the shear that was conventionally installed in the pre-joining process is no longer required, and the processing time required for joining can be shortened and the equipment can be made more compact. can. Furthermore, since the time required for joining is short, there is no need to lower the rolling speed during joining, and productivity can be improved.

Furthermore, since the uneven shape consisting of a plurality of longitudinal grooves is formed in the material, the tensile strength of the plate joint is high, a large tension can be applied during rolling, and the rolling load can be reduced. This makes it possible to downsize the rolling mill and lead to a reduction in equipment costs.

[Brief explanation of the drawing]

1(a) to 1(d) are diagrams showing each step of a joining method according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state when rolled materials are engaged, and FIG. Figures (a) and (b)
) is a diagram showing a conventional joining method, FIGS. 4(a) and (b) are diagrams showing a modified example in which the cross-sectional shape of the groove is changed in the width direction, and FIGS. 5(a) and ( b) and (C) are diagrams showing modified examples of groove shapes other than rectangular, and FIG. 6 is an elevational view of the rolled material entry side of the forming and cutting device in the joining device according to an embodiment of the present invention. 7 is an elevational view of the rolled material outlet side of the forming and cutting device, FIG. 8 is a diagram showing a modification of the configuration of the rolled material outlet side, and FIG. 9 is a view of the joining device. FIG. 10 is a diagram showing deformation of the shape of the press, and FIG. 11 is a schematic diagram of a hot rolling facility incorporating a joining device. Explanation of symbols 1.2...Rolled material 3.4...Dice (first device) 5.6...Dice (second device) 7.8...Press (fourth device) 12... Hydraulic cylinder (first device) 17... Hydraulic cylinder (third device) 21... Hydraulic cylinder (second device)
device) 24... Hydraulic cylinder (third device) 29.
30... Hydraulic cylinder (fourth device) 31-37...
・Finishing rolling stand 41...Joining device Applicant Hitachi, Ltd. Representative Patent attorney Yuzuru Kasuga Figure 1(a) (cl) 17・
...Hydraulic cylinder (third device) Fig. 2 (a) (b) After sales Fig. 4 (a) (b) (a)
(b) (c)
Figure 8 Figure 9

Claims (7)

[Claims] (1) In a plate joining method in hot rolling in which the rear end of the first material and the front end of the second material are overlapped and pressed, the joint surface of the rear end of the first material and the Forming concavo-convex shapes that engage with each other on the bonding surfaces of the leading ends of the two materials, applying shearing force at the same time to cut off unnecessary portions of the leading and trailing ends of the materials, and then interlocking and overlapping the concave-convex shapes and pressing. Characteristic board joining method. (2) A method for joining plate materials according to claim 1, wherein the uneven shape is a plurality of longitudinal grooves that engage with each other. (3) The method for joining plate materials according to claim 2, wherein at least one of the width of the groove in the longitudinal direction and the depth of the groove in the uneven shape is changed in the width direction of the plate. (4) In a plate joining device for hot rolling that overlaps and presses the rear end of a first material and the front end of a second material to join them, the joining surface of the rear end of the first material is uneven. a first device for forming a shape; disposed proximate to the first device;
a second device for forming a concavo-convex shape that engages with a concave-convex shape of the first material on the joint surface of the tip of the second material; a third device that imparts a shearing function to the first and second devices;
A plate joining device comprising: a fourth device that presses the first and second materials after overlapping the uneven shapes. (5) In the plate joining device for hot rolling according to claim 4, the first and second devices each have a plurality of longitudinal grooves that engage with each other as uneven shapes of the first and second materials. A plate joining device characterized by having a forming die. (6) In the plate joining device for hot rolling according to claim 4, the fourth device has a pair of press members that press the first and second materials, and the press surfaces of these press members are A plate joining device characterized in that each material has a tapered surface inclined in a direction away from the corresponding material surface at least on the end surface side of the material. (7) A hot rolling facility characterized in that the plate joining device according to claim 4 is disposed on the entry side of a hot finishing mill.