JP3596626B2 - Rolled material joining apparatus and joining method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a rolled material joining apparatus and a joining method for joining ends of rolled materials to each other.
[0002]
[Prior art]
In a conventional hot rolling mill (hot strip mill), bar materials rolled by a rough rolling mill are separately supplied to a finishing mill to obtain a strip material having a desired thickness. However, such a method cannot uniformly roll the entire rolled material, easily causing defects at the front end and the rear end, thereby lowering the yield of the rolled material, and increasing the rolling speed due to biting / tail loss. There was a problem that was difficult to make.
[0003]
In order to solve such a problem, a joining apparatus that joins a rear end of a preceding rolled material and a front end of a succeeding rolled material in order to continuously supply a rolled material to a finishing mill has been conventionally proposed (for example, JP-A-62-252603, JP-A-63-93408, and JP-B-5-139).
[0004]
[Problems to be solved by the invention]
Japanese Patent Application Laid-Open No. 62-252603 discloses a "plate joining method" in which a joint is driven between ends of a plate to be joined and joined, but sufficient joining strength is secured over the entire width of the rolled material. To do so, it is necessary to drive a large number of joints in a short time, and automation (mechanization) is difficult, and the joints cannot be uniformly rolled.
[0005]
In addition, the "running welding device for strip" in Japanese Patent Publication No. 5-139 is a device for welding and joining the rear end and the front end while traveling with the rolled material, but it takes time to weld a wide rolled material. For this reason, there has been a problem in that the entire equipment is likely to be long, and irregularities are likely to occur in the joint, and it is difficult to uniformly roll the joint.
Further, the "bar joining equipment" of JP-A-63-93408 forms a loop in a rolled material and presses the rear end and the front end. There was a problem that it was difficult to secure sufficient joining strength over the entire width of the material. In addition, in order to continuously supply the rolled material to the finish rolling mill and uniformly roll the joint, it is necessary to compress the overlapped portion to the thickness of one rolled material. There is a problem that a force (for example, about 1000 tons) is required and the press-connecting device becomes large.
[0006]
The present invention has been made to solve the various problems described above. That is, the object of the present invention is to be able to join the ends of the rolled material to each other with a relatively small and small output facility, and to join with sufficient joining strength over the entire width of the rolled material in a short time, It is an object of the present invention to provide an apparatus and a method for joining a rolled material in which the joining portion has little unevenness and can be processed substantially uniformly.
[0007]
[Means for Solving the Problems]
According to the present invention, a rear end clamping device that can vertically move by horizontally nipping the rear end of the preceding rolled material, a front end clamping device that horizontally grips the front end of the succeeding rolled material, An inclined processing device that simultaneously cuts the lower surface of the end and the upper surface of the leading end of the succeeding rolled material obliquely, a reduction holding device that holds the processed surface in a reduced state, and superimposes the processed surfaces of the preceding rolled material and the succeeding rolled material. And a pressure welding device that compresses and joins the rolled material to substantially the same thickness as the rolled material, wherein the tilting device is a cylindrical cutter that rotates about an axis in the width direction of the rolled material, and the cutter is moved in the rolling direction. And a reciprocating device that reciprocates obliquely with respect to the rolled material joining device.
[0008]
According to a preferred embodiment of the present invention, the pressing device comprises: an upper die having a lower surface in contact with a rear end upper surface of a preceding rolled material; a lower die having an upper surface in contact with a front end lower surface of a succeeding rolled material; And a press device for holding and compressing the lower mold. Further, it is preferable that the reduction holding device is a reducing flame burner that forms a reduced state by burning the combustible gas with oxygen less than an amount that completely burns the combustible gas. Further, it is preferable that the reducing flame burner is fixed to a frame of a roller or to a pedestal via a fixed stand, so that the cutting surface is always kept in a reduced state.
[0009]
Further, according to the present invention, the rear end of the preceding rolled material and the leading end of the succeeding rolled material partially overlap and the preceding rolled material has a higher height than the succeeding rolled material, While holding the leading end of the rolled material horizontally and holding the overlapping portion in the reduced state, the lower surface of the rear end of the preceding rolled material and the upper surface of the leading end of the succeeding rolled material are simultaneously cut obliquely, and then the overlapping portion is cut. While maintaining the reduced state, the overlapped portion is compressed to approximately the same thickness as the rolled material, and the rear end of the preceding rolled material and the leading end of the succeeding rolled material are joined, and a method of joining a rolled material is provided. You.
[0010]
[Action]
According to the above-described apparatus and method of the present invention, the end faces of the preceding rolled material and the succeeding rolled material are simultaneously cut obliquely with respect to the rolling direction by the inclined processing device, so that the pressure welding is performed in comparison with the case where the rolled materials overlap as they are. The thickness of the previous overlapping part is reduced, the compression force for compressing and joining to approximately the same thickness as the rolled material is reduced, the equipment is relatively small and small output, and there is almost no unevenness of the joint, The ends of the rolled material can be joined together.
[0011]
Further, since the entire width of the rolled material can be joined in two steps of cutting by the tilting device and pressing by the pressing device, the joining time can be greatly reduced. Furthermore, since the processing surface is cut and pressed while the processed surface is kept in the reduced state by the reduction holding device, the processed surface is hardly oxidized, and the processed surface can be brought into close contact with the gap without any gap, and the width of the rolled material can be reduced. Bonding can be performed with sufficient bonding strength throughout.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted.
FIG. 1 is an overall configuration diagram of a rolled material joining apparatus according to the present invention. In this figure, a rolled material joining apparatus 10 of the present invention includes a rear end clamp device 14 that can vertically move the rear end portion of a preceding rolled material 1 while horizontally holding the rear end portion thereof, and horizontally holds a front end portion of a subsequent rolled material 2. Tip clamping device 16 which performs cutting, an inclined machining device 18 which simultaneously and obliquely cuts the rear end lower surface of the preceding rolled material 1 and the front end upper surface of the succeeding rolled material 2, and reduction which keeps the processed surfaces 1a and 2a in a reduced state. The apparatus includes a holding device 20 and a pressure welding device 22 that overlaps the processing surfaces 1a and 2a of the preceding rolled material 1 and the succeeding rolled material 2 and compresses and joins them to substantially the same thickness as the rolled material.
[0013]
The tilting device 18 includes a cylindrical cutter 19a that rotates about an axis Z in the width direction of the rolled materials 1 and 2, and a return device 19b that reciprocates the cutter 19a obliquely with respect to the rolling direction. The cutter 19a is rotated by a driving device (not shown). The cutter 19a is longer than the entire width of the rolled materials 1 and 2, and a plurality of blades are provided on the outer peripheral portion with the same diameter, so that a single cutter 19a can simultaneously cut the entire width of the rolled materials 1 and 2. ing.
[0014]
With this configuration, the cutter 19a is reciprocated obliquely, whereby both the lower surface of the rear end portion of the preceding rolled material 1 and the upper surface of the front end portion of the subsequent rolled material 2 can be simultaneously and obliquely cut. This also reduces the thickness of the overlapped portion before the pressure welding compared to the case where the overlapped portion is simply compressed to the thickness of one rolled material, and compresses and joins to approximately the same thickness as the rolled material. Can reduce the compressive force of the rolled material, and it is possible to join the ends of the rolled material to each other with relatively small and small output equipment, and with almost no unevenness in the joint.
[0015]
FIG. 2 is a diagram schematically showing a relationship between a load P required for pressure welding of a rolled material and a logarithmic strain ε. It is known that the load P required for the pressure welding of the rolled material is proportional to the logarithmic strain ε to the nth power (P∝ε ⁿ : n ≒ 0.21), and the two rolled materials shown in FIG. In the case where the sheet is compressed to a thickness as shown in (B), ε = ln (2t / t) = 0.693, and a pressing force P of about 1000 tons is required. On the other hand, as shown in FIG. 2 (C), by cutting the ends of the rolled material obliquely and superimposing them, for example, when t = 40 mm and S = 5 mm in the figure, the logarithmic distortion is ε = ln (( t + S) / t) = 0.118, and the pressing force P can be reduced by about 45%.
[0016]
The rear end clamp device 14 includes a plurality of rollers 15a that horizontally support the rear end of the preceding rolled material 1 and a clamp 15b that moves up and down to clamp the rear end of the preceding rolled material 1 between the rollers 15a. A working height H for bringing the lower end of the rear end of the preceding rolled material 1 into contact with the upper surface of the cutter 19a, and a pressing height for holding the rear end of the preceding rolled material 1 at substantially the same height as the front end of the succeeding rolled material 2. L and a lift cylinder 15c for moving the roller 15a and the clamp 15b up and down. With this configuration, the rear end of the preceding rolled material 1 can be clamped by the clamp 15b while the rear end of the preceding rolled material 1 is horizontally supported by the roller 15a. The roller 15a and the clamp 15b are held at the processing height H by the lifting cylinder 15c, and the lower surface of the rear end of the preceding rolled material 1 and the upper surface of the front end of the subsequent rolled material 2 are simultaneously obliquely cut by a single cutter 19a. Processing can be performed, and the processed surfaces 1a and 2a of the preceding rolled material 1 and the succeeding rolled material 2 can be overlapped while being held at the press-contact height L, and can be joined by compression by the press-contact device 22.
[0017]
The leading end clamp device 16 includes a plurality of rollers 17a that horizontally support the leading end of the subsequent rolled material 2 and a clamp 17b that moves up and down to clamp the leading end of the subsequent rolled material 2 between the rollers 17a. . This configuration is similar to that of the rear end clamp device 14 except that there is no elevating mechanism. With this configuration, the tip of the subsequent rolled material 2 can be clamped by the clamp 17b while the tip of the subsequent rolled material 2 is horizontally supported by the roller 17a.
[0018]
The pressing device 22 includes an upper die 23a having a lower surface in contact with a rear end upper surface of the preceding rolled material 1, a lower die 23b having an upper surface in contact with the front end lower surface of the succeeding rolled material 2, and an upper die 23a and a lower die 23b. And a press device 23c for holding and compressing. The lower mold 23b is fixed to a predetermined position of the pedestal 12. The upper die 23a is attached to the lower surface of the ram 23e of the press device 23c, and moves up and down together with the ram 23e. With this configuration, during the cutting by the tilting device 18, the rear end of the preceding rolled material 1 and the front end of the succeeding rolled material 2 can be supported by the upper die 23a and the lower die 23b, and the pressing device 23c By lowering the ram 23e, the working surfaces 1a and 2a of the preceding rolled material 1 and the succeeding rolled material 2 can be superimposed and compressed immediately after the completion of the cutting. Further, by compressing the overlapped portion to approximately the same thickness as the rolled materials 1 and 2 by this compression, the joint can be almost uniformly rolled with almost no unevenness in the joint.
[0019]
The reduction holding device 20 burns a combustible gas such as COG (coke oven gas), LPG, or LNG with oxygen smaller than an amount that completely burns the gas, thereby reducing the gas containing reducing radicals such as hydrogen radicals and CH ₂ O radicals. The reducing flame burners 20a and 20b form a reducing state by flame. As shown in the figure, the reducing flame burner 20a is attached to the frame of the roller 15a, and the reducing flame burner 20b is attached to the pedestal 12 via the fixed stand 21. Then, a reducing flame gas is blown toward the processing surfaces 1a and 2a of the preceding rolled material 1 and the succeeding rolled material 2, so that the cut surface is always kept in a reduced state. With such a configuration, during the cutting process by the tilting device 18 and the pressing process by the pressing device 22, the processed surfaces 1a and 2a are kept in a reduced state, the oxidation thereof is prevented, and the processing surface 1a, 2a is increased by the relatively small pressing force described above. Bonding strength can be ensured.
[0020]
In order to join the rear end of the preceding rolled material and the front end of the succeeding rolled material while continuously supplying the rolled material to the finish rolling mill, the above-described pedestal 12 is a traveling vehicle, and Although it is preferable to install the joining device shown in FIG. 1, the present invention is not limited to this. For example, the joining device may be fixedly incorporated in a rolling facility together with a device for forming a rolled material into a loop.
[0021]
FIG. 3 is a diagram illustrating the operation of the method for bonding rolled materials according to the present invention. In FIG. 3A, the rear end of the preceding rolled material 1 is horizontally held by the rear end clamp device 14, and the front end of the succeeding rolled material 2 is also horizontally held by the front end clamp device 16. The rear end portion of the preceding rolled material 1 and the front end portion of the succeeding rolled material 2 are located at positions where the joining portions overlap vertically, and the rear end portion of the preceding rolled material 1 is at a processing height H by the rear end clamping device. The tilting device 18 and the pressing device 22 are in a standby state, the lower surface of the upper die 23a is in contact with the upper surface of the rear end of the preceding rolled material 1, and the lower surface of the lower die 23b is in contact with the lower surface of the leading end of the succeeding rolled material 2. .
[0022]
Then, as shown in FIG. 3 (B), the cutter 19a is reciprocated obliquely in the rolling direction (left and right in the figure) by the reciprocating device 19b of the tilting device 18, and the lower surface of the rear end portion of the preceding rolled material 1 and the subsequent The upper surface of the leading end of the rolled material 2 is simultaneously cut obliquely. During processing, the processing surface is held in a reduced state by the reduction holding device.
Then, as shown in FIG. 3 (C), the cutter 19a returns to the standby position, and the rear end of the preceding rolled material 1 is lowered to the press contact height L by the rear end clamp device 14, and at the same time, the leading The processing surfaces of the rolled material 1 and the succeeding rolled material 2 are overlapped and compressed to substantially the same thickness as the rolled material to complete the joining. Even during the pressing, the processed surface is held in the reduced state by the reduction holding device 20.
[0023]
According to such a joining method, since the end face of the rolled material is simultaneously cut obliquely, the thickness of the overlapped portion before the pressure welding becomes thinner compared to the case where the rolled material overlaps as it is, to approximately the same thickness as the rolled material. The compressive force for joining by compression can be reduced, the equipment is relatively small and has a small output, and there is almost no unevenness in the joint, and the ends of the rolled material can be joined to each other.
[0024]
In addition, since the entire width of the rolled material can be joined in two steps of cutting and pressing, the joining time can be greatly reduced. Furthermore, since the cut surface is cut and pressed while maintaining the processed surface in the reduced state, the processed surface is hardly oxidized, and the processed surface can be brought into close contact with a gap without any gap. Joining can be performed with joining strength.
[0025]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.
[0026]
【The invention's effect】
As described above, the apparatus and method for joining a rolled material of the present invention can join the ends of the rolled material to each other with relatively small and low-power equipment, and can sufficiently cover the entire width of the rolled material in a short time. It has excellent effects such as being able to join with a high joining strength and being able to process the joining portion almost uniformly with little unevenness of the joining portion.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a rolled material joining apparatus according to the present invention.
FIG. 2 is a diagram showing a relationship between a load P required for pressure welding of a rolled material and a logarithmic strain ε. FIG. 3 is an operation explanatory diagram of a rolled material joining method according to the present invention.
[Explanation of symbols]
Reference Signs List 1 Pre-rolled material 1a Worked surface 2 Subsequent rolled material 2a Worked surface 3 Rail 4 Roller 10 Rolled material joining device 12 Pedestal 14 Rear end clamp device 15a Roller 15b Clamp 15c Lifting cylinder 16 Tip clamp device 17a Roller 17b Clamp 18 Incline processing device 19a Cutter 19b Reversing device 20 Reduction holding device 20a, 20b Reduction flame burner 21 Fixed stand 22 Pressing device 23a Upper die 23b Lower die 23c Pressing device 23e Ram H Working height L Pressing height

Claims (5)

A trailing end clamp device that can vertically move the rear end of the preceding rolled material while holding it horizontally, a leading end clamp device that horizontally clamps the leading end of the succeeding rolled material, the rear end lower surface of the preceding rolled material, and subsequent rolling An inclined processing device that simultaneously cuts the upper surface of the leading end of the material obliquely, a reduction holding device that holds the processed surface in a reduced state, and the processing surface of the preceding rolled material and the succeeding rolled material is superimposed and almost the same as the rolled material. A pressure welding device that compresses and joins to a thickness,
The tilting device includes a cylindrical cutter that rotates about an axis in the width direction of the rolled material, and a reversing device that reciprocates the cutter obliquely with respect to the rolling direction. Rolled material joining equipment. The press-contact device includes an upper die having a lower surface in contact with a rear end upper surface of a preceding rolled material, a lower die having an upper surface in contact with a front end lower surface of a succeeding rolled material, and a press for holding and compressing the upper die and the lower die. The rolled material joining device according to claim 1, comprising: a device. 2. The rolled material joining apparatus according to claim 1, wherein the reduction holding device is a reducing flame burner that forms a reduced state by burning the combustible gas with oxygen less than an amount that completely burns the combustible gas. 3. The rolled material joining apparatus according to claim 3, wherein the reducing flame burner is fixed to a frame of a roller or to a pedestal via a fixed stand, whereby the cut surface is always kept in a reduced state. The rear end of the preceding rolled material and the leading end of the succeeding rolled material partially overlap and the preceding rolled material is at a height higher than the succeeding rolled material. Hold and
While maintaining the overlapping portion in the reduced state, the rear end lower surface of the preceding rolled material and the front end upper surface of the subsequent rolled material are simultaneously cut obliquely,
Then, while maintaining the overlapped portion in the reduced state, the overlapped portion is compressed to substantially the same thickness as the rolled material, and the rear end of the preceding rolled material and the leading end of the succeeding rolled material are joined, a rolled material characterized by the above-mentioned. Joining method.

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