JP3781128B2 - Pressure welding equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hot rolling facility, which relates to a facility for press-welding after cutting the trailing end of the preceding rolled material and the leading end of the following rolled material, and in particular, the pressure-welding with a reduced overlap area of the rolled material to be pressure-welded. It relates to joining equipment.
[0002]
[Prior art]
In a conventional hot rolling facility, a slab supplied from a heating furnace is rolled by a rough rolling mill and a finish rolling mill to obtain a strip material having a desired plate thickness. However, in such a method, since the rolling operation is performed for each slab unit, it has been desired to perform the rolling operation continuously. In addition, when rolling in slab units in this way, defects are likely to occur at the ends (front end and rear end) of the rolled material, and the yield of the rolled material is reduced, and the rolling speed is increased due to biting and slipping off. There was a problem that was difficult to convert. For this reason, there has been proposed a joining apparatus that joins the rear end of the rolled material rolled by the rough rolling mill and the front end of the next rolled material and supplies them to the finishing mill.
[0003]
[Problems to be solved by the invention]
In the case of pressure welding, the trailing end of the preceding rolled material and the leading end of the succeeding rolled material are overlapped and compressed, but conventionally, the ends cut in a straight line are overlapped as shown in FIG. As the stacking margin, 30 to 60 mm is required at the end of the width of the rolled material depending on the plate thickness, but it may be small at the center. Moreover, the capability of the press used when compressing is determined by the overlapping area. For this reason, it has been demanded to overlap so as to reduce the overlap area and reduce the ability of the press to compress.
[0004]
Japanese Patent Application Laid-Open No. Sho 62-252603 discloses a technique for driving a joint between end portions of plates to be joined, but it is sufficient over the entire width of the rolled material. In order to ensure the bonding strength, it is necessary to drive a large number of joints in a short time, which makes it difficult to automate (mechanize) and to uniformly roll the joint portion. Japanese Patent Application Laid-Open No. 63-93408 discloses a technique for forming a loop on a rolled material and press-contacting the rear end and the tip. However, a relatively thick bar material is used for the loop. As a result, the bar material is prone to bending wrinkles and sufficient joining time cannot be secured, and there is a problem that sufficient joining strength cannot be secured over the entire width of the rolled material even if the rear end and the leading end are pressed. . Furthermore, in “Bet plate running welding device” of Japanese Patent Publication No. 5-139, a device that welds and joins the rear end and the tip while running with the rolled material is shown, but a wide rolled material is welded. Since it takes time, the entire equipment tends to be long, and unevenness is likely to occur at the joint, which makes it difficult to uniformly roll the joint. In addition, when the above-described joining device is added to an existing line, there is a problem that the existing line is remodeled and the production downtime becomes longer.
[0005]
The present invention has been made in view of the above-mentioned demands and problems, and an object of the present invention is to provide a pressure welding facility provided with a device for reducing the overlapping area when pressure-bonding rolled materials. Furthermore, the rear end of the preceding rolled material and the leading edge of the subsequent rolled material can be joined while traveling together with the rolled material, and can be joined 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 allow the joint portion to be processed almost uniformly with less unevenness in the joint portion.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a cutting device for cutting the trailing end of the preceding rolled material and the leading end of the following rolled material, and the trailing end of the preceding rolled material provided downstream of the cutting device and the following rolled material. A rolling material joining device that overlaps and presses the leading end, and the cutting device cuts at least one of the leading end of the preceding rolled material and the leading end of the succeeding rolled material into a concave arc shape, The trailing end of the preceding rolled material and the leading end of the succeeding rolled material are brought into pressure contact over the entire width of the rolled material so that the overlapping allowance is reduced from the both ends of the sheet width to the center.
[0007]
The cutting device is composed of a pair of rotating drums having blades on the outer periphery and meshing with each other. The blades are arranged approximately 180 degrees apart from each other, and each blade has a line connecting both ends. The two blades on each rotary drum are symmetric with respect to the rotation axis.
[0008]
In addition, the rolling material joining device includes a cart that travels in the rolling direction, a rear end clamping device that is mounted on the cart and that can move up and down by horizontally holding a rear end portion of the preceding rolling material, A tip clamp device that horizontally holds the tip of the subsequent rolled material attached to the machine, a processing device that cuts the lower surface of the rear end of the preceding rolled material, and the upper surface of the tip of the subsequent rolled material, and a reduced state of the processed surface A holding device for reducing and holding a pressure welding device that compresses the processed surfaces of the preceding rolled material and the succeeding rolled material to the same thickness by overlapping them,
The pressure welding apparatus is configured such that the overlap margin decreases as the leading end of the preceding rolled material and the leading end of the succeeding rolled material are moved from both ends of the sheet width to the center.
[0009]
[Action]
With the above configuration, at least one of the trailing end of the preceding rolled material and the leading end of the succeeding rolled material has a concave arc shape. Overlaying cost is reduced. Compared to the conventional one in which both ends of the rolled material are straight, the overlapping area is reduced, and the capacity of the compression device used for compression can be reduced accordingly. If both the rear end portion of the preceding rolled material and the front end portion of the subsequent rolled material are formed in a concave arc shape, the overlapping area is further reduced, and accordingly, the ability of the compression device used for compression can be further reduced.
[0010]
The blade of the cutting device has an arc shape, and the shape of the cut end portion becomes a concave arc shape in consideration of the rotation direction according to the rear end portion of the preceding rolled material or the front end portion of the subsequent rolled material. When the trailing end of the preceding rolled material is cut into a concave arc and then the leading end of the succeeding rolled material is cut in the same rotation direction, a concave arc is similarly formed. This is because the two blades are arranged symmetrically with respect to the rotation axis.
[0011]
In the rolling material joining apparatus, the carriage travels in the rolling direction while the preceding rolling material and the succeeding rolling material are sandwiched between the trailing end clamping device and the leading end clamping device, so that the rolling material can be continuously supplied to the finishing mill. In addition, the joint surface is cut by a processing device and compressed by a rolling device. This enables continuous cutting and press-contact, so that press-contact can be performed in a short time and high-speed press-contact is possible. At this time, since the processed surface is brought into a reduced state and pressed by the reduction holding device, sufficient bonding strength can be obtained. Further, since the pressure welding apparatus superimposes the processed surfaces of the preceding rolled material and the succeeding rolled material and compresses them to substantially the same thickness, a substantially uniform joint can be obtained. Also, the rolling length is reduced as the leading end of the preceding rolled material and the leading end of the succeeding rolled material are moved from the both ends of the sheet width to the center during rolling, so the overlapping area is reduced and the compression force is reduced. can do.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same numerals indicate the same meaning.
FIG. 1 is a diagram showing the arrangement of this embodiment in a hot rolling facility. The slab delivered from the heating furnace 5 is rolled by the rough rolling machine row R, and the rolled material 1 is cut into a concave arc shape at the leading end and the trailing end by the cutting device 6 of this embodiment. The rolling material joining apparatus 10 of the present embodiment overlaps and compresses the rear end portion of the preceding rolled material 1a and the leading end portion of the succeeding rolled material 1b while running and press-weld. The joined rolled material 1 is finish-rolled by a finish rolling machine row F to have a desired plate thickness, and is wound around the downcoiler DC. In addition, since the quantity of the rolling material 1 wound up by the downcoiler DC is constant, the rolling material joining apparatus 10 does not join in the cutting position of the rolling material 1 corresponding to the quantity.
[0013]
FIG. 2 shows a configuration of the cutting device 6, (A) is a cross-sectional view, and (B) is a development view of the rotating drum. The cutting device 6 has a pair of rotating drums 6a arranged with the rolled material 1 sandwiched therebetween, and a line connecting the both ends of the rotating drum 6a at a distance of approximately 180 degrees is parallel to the rotating shaft 7 and symmetrical with respect to the rotating shaft 7. Arc-shaped blades 6b, 6c arranged so as to be The rotating drum 6a is provided with a flank 6d so that the rolled material 1 can pass therethrough.
[0014]
3A and 3B are explanatory views of cutting the rear end of the preceding rolled material 1a by the cutting device 6. FIG. 3A is a cross-sectional view, and FIG. 3B is a plan view of the rolled material 1. FIG. It rotates when the rear end of the preceding rolled material 1a goes out of the rotating drum 6a, and cuts the end into a concave arc shape as indicated by the broken line in (B). A straight arrow indicates the traveling direction of the rolled material 1.
[0015]
4A and 4B are explanatory views of cutting the leading end of the subsequent rolled material 1b by the cutting device 6. FIG. 4A is a sectional view, and FIG. 4B is a plan view of the rolled material 1. FIG. When the leading end of the subsequent rolled material 1b enters the rotating drum 6a, it rotates, and the end is cut into a concave arc shape as indicated by the broken line in FIG. A straight arrow indicates the traveling direction of the rolled material 1.
[0016]
FIG. 5 is a side view showing the configuration of the rolled material joining apparatus. In FIG. 5, a rolled material joining apparatus 10 includes a carriage 12 that travels in the rolling direction, and a rear end clamping apparatus 14 that can be moved up and down by horizontally holding a rear end portion of a rolled material 1a that is mounted on the carriage 12 and precedes. And a tip clamping device 16 that horizontally attaches the tip of the subsequent rolled material 1b mounted on the carriage 12, and a processing device that cuts the lower surface of the rear end portion of the preceding rolled material 1a and the upper surface of the tip portion of the subsequent rolled material 1b. 18, a reduction holding device 20 that holds the processed surface in a reduced state, and a pressure welding device that compresses and joins the processed surfaces of the preceding rolled material 1a and the subsequent rolled material 1b to approximately the same thickness as the rolled materials 1a and 1b. 22.
[0017]
The rear end clamping device 14 includes a plurality of rollers 15a that horizontally support the rear end of the preceding rolled material 1a, and a clamp 15b that moves up and down while sandwiching the rear end of the preceding rolled material 1a between the rollers 15a. Processing height H for bringing the lower surface of the rear end of the preceding rolled material 1a into contact with the upper surface of a cutter 19a, which will be described later, and the pressure contact height for holding the rear end of the preceding rolled material 1a at substantially the same height as the tip of the subsequent rolled material 1b. Between the length L, it is composed of an elevating cylinder 15c that moves the roller 15a and the clamp 15b up and down. With this configuration, the rear end of the preceding rolled material 1a can be clamped by the clamp 15b while the rear end of the preceding rolled material 1a is horizontally supported by the roller 15a. Further, the roller 15a and the clamp 15b are held at the processing height H by the lifting cylinder 15c, and the rear end lower surface of the preceding rolled material 1a and the upper end surface of the subsequent rolled material 1b are cut by a single cutter 19a. In addition, the processing surfaces of the preceding rolled material 1a and the succeeding rolled material 1b can be overlapped while being held at the pressure height L, and compressed and joined by the pressure welding device 22.
[0018]
The tip clamp device 16 includes a roller 17a that horizontally supports the tip of the subsequent rolled material 1b, and a clamp 17b that sandwiches the tip of the subsequent rolled material 1b between the roller 17a. With this configuration, the leading end portion of the subsequent rolled material 1b can be held by the clamp 17b while the subsequent rolled material 1b is held horizontally by the roller 17a.
[0019]
The processing device 18 includes a cylindrical cutter 19a that rotates about the axis in the width direction of the rolled material 1a, 1b, a swing device 19b that swings the cutter 19a in an oblique direction, and a cutter 19a that moves back and forth in the rolling direction. And a reciprocating device 19c that moves forward. The cutter 19a is attached to the tip of the arm of the swinging device 19b and is rotated by a rotation driving device (not shown). The cutter 19a uses the swinging device 19b and the reciprocating device 19c to cut the rear end lower surface of the preceding rolled material 1a and the upper end surface of the subsequent rolled material 1b at the processing position indicated by the thicker line in FIG. Retreat to the position indicated by the thin line.
[0020]
In the pressure welding device 22, an upper die 23a having a lower surface in contact with the upper surface of the rear end portion of the preceding rolled material 1a, a lower die 23b having an upper surface in contact with the lower surface of the leading end portion of the subsequent rolled material 1b, an upper die 23a, and a lower die 23b. It comprises a press device 23c that pinches and compresses. The lower mold 23 b is fixed to the carriage 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 processing by the processing apparatus 18, the rear end portion of the preceding rolled material 1a and the front end portion of the subsequent rolled material 1b can be supported by the upper mold 23a and the lower mold 23b, and the press apparatus 23c can support the ram. By lowering 23e, the processed surfaces of the preceding rolled material 1a and the succeeding rolled material 1b can be overlapped and compressed to have substantially the same thickness as the rolled materials 1a and 1b.
[0021]
FIG. 6 is a diagram showing a state in which the preceding rolled material 1a and the succeeding rolled material 1b are overlapped at the joint. (A) makes the rear end of the preceding rolling material 1a into a concave circular arc shape, and the subsequent rolling material 1b is made into a straight line. (B) makes the front-end | tip rolling material 1a into the circular arc shape of the succeeding rolling material 1b, and makes the front-end rolling material 1a straight. (C) is such that both ends of the preceding rolled material 1a and the succeeding rolled material 1b are formed in a concave arc shape. The arrow direction indicates the traveling direction of the rolled material 1. m is the overlap margin at the plate width end, which is 30 to 60 mm depending on the plate thickness, and n is the overlap margin at the plate width center of about 10 mm. By using this amount of overlap, it is possible to obtain a bonding strength equivalent to that of the base material. The overlap area is the smallest in the case of (C), and the capacity of the press device 23c may be the smallest accordingly. When the cutting device 6 shown in FIGS. 2 to 4 is used, the superposition of (C) can be realized.
[0022]
The reduction holding device 20 is a reducing flame burner 20a that generates a reducing flame by burning it with less oxygen than the amount that completely burns a combustible gas such as coke oven gas, LPG, LNG, etc., and blows the processed surface to prevent oxidation. The reducing flame burner 20a is attached to the frame of the roller 15a, and the reducing flame burner 20b is attached to the carriage 12 via the fixed stand 21, and reduces the reducing gas toward the processed surfaces of the preceding rolled material 1a and the succeeding rolled material 1b. The cutting surface is always kept in a reduced state. In FIG. 5, the carriage 12 has a plurality of wheels 13 and travels on the rail 3 extending in the rolling direction. At the time of press contact, as shown by the arrow, the vehicle travels to the left on the drawing. B is the rolling height of the rolling device, and a plurality of rollers 4 support the rolled material 1 at the rolling height B and move it in the rolling direction. The rail 3 is disposed at a position straddling the roller 4, and the press contact height L is made higher than the rolling height B so that the carriage 12 can travel at a position higher than the rail 3. Inclined guides 24 and 25 are provided that guide the rolled material 1a and 1b from the rolling height B of the rolling device to the front end clamping device 16 and guide from the rear end clamping device 14 to the rolling height B. ing. Thereby, the existing rolling apparatus can be operated as it is.
[0023]
【The invention's effect】
As is apparent from the above description, the present invention provides a press device for use in pressure welding by reducing the overlapping area by overlapping at least one of the trailing end of the preceding rolled material and the leading end of the following rolled material as a concave arc shape. I try to reduce my ability. By making the ends of both rolled materials into a concave arc shape, the overlapping area can be reduced, and the ability of the press apparatus used for pressure welding can be reduced. By reducing the pressing capability, the pressing device and related devices can be made compact, and the equipment cost can be saved. Furthermore, since the pressure welding equipment of this invention should just provide the equipment which runs a trolley | bogie to the existing equipment, there is little influence on the existing equipment and it can be installed without stopping the existing line. In addition, high-speed pressure welding by continuously processing and compressing the pressure contact surface, sufficient bonding strength by pressing the processed surface in a reduced state, and the overlapped surface is compressed to almost the same thickness as the rolled material. Stable bonding strength can be obtained by setting the thickness to a sufficient value.
[Brief description of the drawings]
FIG. 1 is a diagram showing the relationship between an embodiment of the present invention and other devices in a hot rolling facility.
2A is a sectional view of a cutting device, and FIG. 2B is a development view of a rotating drum.
3A is a cross-sectional view of a cutting device, and FIG. 3B is a view showing a cutting shape of a trailing end of a preceding rolled material.
4A is a cross-sectional view of a cutting device, and FIG. 4B is a view showing a cut shape of a trailing end of a subsequent rolled material.
FIG. 5 is a cross-sectional view of a rolled material joining apparatus.
FIG. 6 is a diagram illustrating a shape of an overlapping portion.
FIG. 7 is a diagram showing the shape of a conventional overlapping portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolled material 1a Pre-rolled material 1b Subsequent rolled material 3 Rail 4 Roller 5 Heating furnace 6 Cutting device 6a Rotating drum 6b, 6c Blade 7 Rotating shaft 10 Rolled material joining device 12 Cart 13 Wheel 14 Rear end clamping device 16 End clamping device 18 Processing device 20 Reduction holding device 20a, 20b Reduction flame burner 21 Fixed stand 22 Pressure welding device 23a Upper die 23b Lower die 23c Press device 23e Ram 24, 25 Inclination guide H Processing height L Pressure height B Rolling height R Roughing mill Row F Finish rolling mill row DC Downcoiler

Claims (3)

A cutting device that cuts the trailing end of the preceding rolled material and the leading end of the following rolled material, and the rear end portion of the preceding rolled material provided downstream of the cutting device and the leading end portion of the following rolled material are overlapped and pressed. A rolling material joining device,
The cutting device cuts at least one of the preceding rolled material rear end and the subsequent rolled material leading end into a concave arc shape,
The rolling material joining apparatus is characterized in that the preceding rolling material rear end and the following rolling material leading end are pressed over the entire width of the rolling material such that the overlapping margin decreases as it goes from both ends of the sheet width to the center. Pressure welding equipment.   The cutting device is composed of a pair of rotating drums having blades on the outer periphery and meshing with each other. The blades are arranged approximately 180 degrees apart from each other, and each blade has a line connecting both ends as a rotating shaft of the rotating drum. 2. The pressure welding equipment according to claim 1, wherein the blades are parallel and arcuate, and the two blades on each rotary drum are symmetrical with respect to the rotation axis.   The rolling material joining device includes a cart that travels in the rolling direction, a rear end clamping device that can be moved up and down by horizontally holding the rear end portion of the rolled material that is mounted on the cart and precedes, and is mounted on the cart. A leading end clamping device that horizontally holds the leading end portion of the subsequent rolled material, a processing device that cuts the bottom end portion lower surface of the preceding rolled material and the top end surface of the succeeding rolled material, and holds the processing surface in a reduced state. A reduction holding device, and a pressure welding device that overlaps the processed surfaces of the preceding rolled material and the subsequent rolled material and compresses them to substantially the same thickness, and the pressure welding device includes a trailing end of the preceding rolled material and a leading end of the subsequent rolled material. 2. The pressure welding equipment according to claim 1, wherein pressure welding is performed so that an overlap margin is reduced from both ends of the plate width toward the center.

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