Molding device, welded pipe manufacturing device, pipe molding method, and welded pipe manufacturing method

Abstract

The molding device is provided with a pipe molding unit and an end surface molding unit. The pipe molding portion has a through hole (43) whose diameter decreases from the inlet toward the outlet. The end surface molding part has a first side wall and a second side wall protruding from the inner wall of the through hole (43) and facing in a direction intersecting the inner circumferential direction of the through hole (43). Moreover, the end surface molding portion has a protrusion (422), a first side wall and a second side wall of the protrusion (422) extend in a direction from the inlet toward the outlet, and a width of the protrusion (422) from the first side wall to the second side wall decreases from the inlet toward the outlet.

Description

Technical Field

[0001] The present disclosure relates to a forming device, a manufacturing device for a welded pipe, a pipe forming method, and a manufacturing method for a welded pipe. Background Art

[0002] The welded pipe is formed by bending a strip metal plate into a tube in the width direction and abutting and welding the two ends in the width direction. In order to manufacture a welded pipe of this structure, a device for bending a strip metal plate into a tube in the width direction has been developed.

[0003] For example, Patent Document 1 discloses a device for manufacturing a welded pipe, which includes: an upper roller and a lower roller, which bend a strip metal plate in the width direction; and a pipe forming section, which has two split dies, wherein arc-shaped grooves in cross-section of the two split dies are opposed to each other, and the strip metal plate bent in the width direction is fed into a space formed between the opposing grooves of the split dies, thereby forming the fed strip metal plate into a tubular metal plate.

[0004] In the manufacturing device of the welded pipe described in Patent Document 1, the split die is arranged at a position where the grooves are separated from each other on the side where the strip metal is fed in and the grooves are close to each other on the side where the strip metal plate is fed out. As a result, when the strip metal plate curved in the width direction is fed between the grooves, the strip metal plate becomes round in the width direction toward the side where it is fed out, and forms a tubular metal plate.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2001-239314 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the manufacturing device of the welded pipe described in Patent Document 1, each split mold can be rotated around an axis to form the above-mentioned intervals between the grooves. Furthermore, by rotating the split molds around the axis, the relative positions of the split molds are adjusted, and as a result, the intervals between the grooves are adjusted to a desired size. However, it is not easy to adjust the relative positions of the split molds.

[0010] The present disclosure is made to solve the above-mentioned problems, and its purpose is to provide a forming device, a manufacturing device for a welded pipe, a pipe forming method, and a manufacturing method for a welded pipe that can form a strip metal plate into a tubular metal plate without complicated position adjustment of parts.

[0011] Means for solving problems

[0012] In order to achieve the above-mentioned object, the forming device of the present disclosure comprises: a tube forming part having a through hole whose diameter decreases from an inlet to an outlet; and an end face forming part having a protrusion having a first side wall and a second side wall protruding from the inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet to the outlet, and the width of the protrusion from the first side wall to the second side wall decreases from the inlet to the outlet. Furthermore, the tube forming part feeds a strip metal plate bent in the width direction from the inlet of the through hole, so that the first end face and the second end face in the width direction of the strip metal plate approach each other from the inlet to the outlet, thereby forming the strip metal plate into a tubular metal plate in which the first end face and the second end face face face each other. In addition, the end face forming part feeds the strip metal plate from the inlet in a state where the protrusion is inserted between the first end face and the second end face of the strip metal plate, so that the first side wall and the second side wall abut against the first end face and the second end face, and the first end face and the second end face face each other, so that the first end face and the second end face face each other.

[0013] Effects of the Invention

[0014] According to the structure disclosed in the present invention, the forming device only includes the tube forming part and the end surface forming part, and the end surface forming part has a protrusion provided in the through hole of the tube forming part. Thus, the forming device can form a strip metal plate into a tubular metal plate without complicated position adjustment of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side view of the front half of the manufacturing apparatus of the welded pipe in Embodiment 1 of the present disclosure.

[0016] Figure 2 It is a side view of the latter half of the welded pipe manufacturing apparatus according to the first embodiment of the present disclosure.

[0017] Figure 3A This is a cross-sectional view of a blanking roller and a formed strip-shaped metal plate when the forming device has a blanking roller.

[0018] Figure 3B This is a cross-sectional view of a blanking roller and a formed strip-shaped metal plate when the forming device has a blanking roller.

[0019] Figure 3C This is a cross-sectional view of a blanking roller and a formed strip-shaped metal plate when the forming device has a blanking roller.

[0020] Figure 4A This is a cross-sectional view of a finishing roll and a formed strip-shaped metal plate when the forming device has a finishing roll.

[0021] Figure 4B This is a cross-sectional view of a finishing roll and a formed strip-shaped metal plate when the forming device has a finishing roll.

[0022] Figure 5 It is a perspective view of a forming device included in the welded pipe manufacturing device according to the first embodiment of the present disclosure.

[0023] Figure 6 It is a cross-sectional view of an edge roll included in a forming device included in the welded pipe manufacturing device according to the first embodiment of the present disclosure.

[0024] Figure 7 It is a cross-sectional view of a side roll included in a forming device included in the welded pipe manufacturing device according to the first embodiment of the present disclosure.

[0025] Figure 8 It is a perspective view of a pipe forming member included in a forming device included in the welded pipe manufacturing apparatus according to the first embodiment of the present disclosure.

[0026] Fig. 9 yes Figure 8 A magnified view of region IX is shown.

[0027] Fig. 10A It is a cross-sectional view of a strip-shaped metal plate bent by a side roll included in a forming device included in the welded pipe manufacturing apparatus according to the first embodiment of the present disclosure.

[0028] Fig. 10B This is a cross-sectional view of a pipe formed by a pipe forming member included in a forming device included in the welded pipe manufacturing apparatus according to Embodiment 1 of the present disclosure.

[0029] Fig.11 It is a top view of the forming device included in the welded pipe manufacturing device according to the second embodiment of the present disclosure.

[0030] Fig.12 It is a perspective view of a forming device included in a welded pipe manufacturing device according to a second embodiment of the present disclosure.

[0031] Fig.13 It is a cross-sectional view of a welding machine included in the welded pipe manufacturing apparatus according to Embodiment 3 of the present disclosure. DETAILED DESCRIPTION

[0032] Hereinafter, a forming device, a manufacturing device for a welded pipe, a forming method for a pipe, and a manufacturing method for a welded pipe according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in the drawings, the same reference numerals are given to the same or equivalent parts. In addition, in the orthogonal coordinate system XYZ shown in the figure, the vertical direction when the upstream and downstream directions of the manufacturing device for the welded pipe are oriented in the horizontal direction is the Z axis, the upstream and downstream directions in the horizontal direction are the X axis, and the direction orthogonal to the Z axis and the X axis is the Y axis.

[0033] (Implementation Method 1)

[0034] The manufacturing device of the welded pipe of the first embodiment is a device for manufacturing the welded pipe by bending a strip metal plate as a material into a tubular shape in the width direction and matching the two ends in the width direction, and then welding the joint formed by matching the two ends. In this manufacturing device, after the strip metal plate is bent in the width direction using a roller device, the strip metal plate is further bent using a tube forming component called a guide shoe to form a tubular metal plate with the two ends in the width direction facing each other. The manufacturing device is described below by taking the case where the welded pipe to be manufactured is a heat transfer pipe used in a heat exchanger as an example. First, referring to Figure 1 and Figure 2 , the overall structure of the welded pipe manufacturing device is described.

[0035] Figure 1 It is a side view of the front half of the welded pipe manufacturing apparatus 1 according to the first embodiment. Figure 2 It is a side view of the rear half of the manufacturing apparatus 1 .

[0036] like Figure 1 and Figure 2 As shown, the welded pipe manufacturing apparatus 1 includes an uncoiler 10 , a splicer 11 , an accumulator 12 , marking machines 13 , 14 , a forming device 15A, a welding machine 16A, a drawing machine 17 , a cutting machine 18 , and a coiling machine 19 .

[0037] A strip-shaped metal plate wound into a coil is supplied to a welded pipe manufacturing apparatus 1. Then, the manufacturing apparatus 1 manufactures a welded pipe from the strip-shaped metal plate. Figure 1 The uncoiler 10 shown unwinds the coiled body formed by winding the strip-shaped metal plate, and pulls out one end side of the strip-shaped metal plate from the coiled body.

[0038] In detail, the uncoiler 10 includes a cylindrical support 111 that holds the coiled body of the strip metal plate from the inside and a driving unit (not shown) that rotates the support 111. The driving unit (not shown) of the uncoiler 10 rotates the support 111 to the side opposite to the winding direction of the coiled body. Thus, the uncoiler 10 pulls out one end of the strip metal plate from the coiled body. The uncoiler 10 supplies one end of the pulled strip metal plate to the splicer 11.

[0039] The connecting machine 11 connects the other end of the strip metal plate to one end of another strip metal plate. Specifically, in the uncoiler 10, although not shown in the figure, when the strip metal plate is completely pulled out from the coil, the next coil is set, and one end side of the strip metal plate is pulled out from the next coil. The connecting machine 11 connects the other end of the strip metal plate of the previous coil on the opposite side of the one end to one end of the strip metal plate pulled out from the next coil.

[0040] The structure thereof will be described. The splicing machine 11 includes a welding machine (not shown). The splicing machine 11 uses the welding machine to weld the other end of the strip metal plate of the previous roll to one end of the strip metal plate of the next roll. The splicing machine 11 is also called a strip joining machine.

[0041] On the other hand, the accumulator 12 stores the strip metal plate pulled out from the coil at a certain length. Specifically, the accumulator 12 includes a roller not shown in the figure. The middle portion of the strip metal plate pulled out from the coil is hung on the roller. Furthermore, in order to prevent the supply of the strip metal plate from being stopped during the welding process using the connector 11, the roller winds the middle portion of the strip metal plate to a certain length that should be supplied within the welding time of the connector 11. Thus, the accumulator 12 retains the strip metal plate at a certain length. After the accumulator 12 winds the middle portion of the strip metal plate to a certain length, one end side portion of the strip metal plate, i.e. Figure 1 The +X end portion of the orthogonal coordinate system XYZ shown is sent to the marking machine 13 .

[0042] The marking machines 13 and 14 are devices for forming grooves on the inner wall of the welded pipe to be manufactured, more specifically, for forming grooves on the inner wall of the strip metal plate to improve the heat exchange performance when the welded pipe is used as a heat transfer pipe.

[0043] In detail, although not shown in the figure, the marking machines 13 and 14 include a first roller called a groove roll or simply a G roller having a groove formed on the outer periphery, and a second roller having no irregularities on the outer periphery and having a smooth curved surface. Figure 1 The strip metal plate whose tension is adjusted by the dancer rollers 131 and 132 is sandwiched between the first roller and the second roller. The marking machine 13 passes the strip metal plate between the first roller and the second roller while the first roller and the second roller are pressed against the strip metal plate. Thus, the marking machine 13 forms grooves on the strip metal plate.

[0044] In contrast, the marking machine 14 has a third roller having grooves of a shape different from the grooves of the first roller formed on the outer periphery, and a fourth roller having no unevenness on the outer periphery and a smooth curved surface on the outer periphery. The marking machine 14 uses the third roller and the fourth roller to clamp the strip metal plate having the grooves formed by the marking machine 13 and the tension adjusted by the tension adjustment rollers 132 and 133. In addition, the marking machine 14 presses the third roller and the fourth roller against the strip metal plate. And, the marking machine 14 passes the strip metal plate between the third roller and the fourth roller. Thus, the marking machine 14 forms grooves on the strip metal plate that are different from those in the case of the marking machine 13.

[0045] The marking machines 13 and 14 perform the above-mentioned processing on the strip metal plate, for example, forming a herringbone groove formed by arranging a plurality of V-shaped grooves along the extending direction of the strip metal plate on the strip metal plate. Alternatively, the marking machines 13 and 14 form a plurality of X-shaped intersecting grooves on the strip metal plate. Alternatively, the marking machines 13 and 14 form embossing on the strip metal plate. The marking machines 13 and 14 form such grooves on the strip metal plate, thereby improving the heat exchange efficiency of the welded pipe when the manufactured welded pipe is used as a heat transfer pipe of a heat exchanger. After forming such grooves on the strip metal plate, the marking machines 13 and 14 move the portion where the grooves are formed to the strip metal plate. Figure 2 The forming device 15A is shown being fed out.

[0046] The forming device 15A first bends the strip metal plate sent from the imprinting machines 13 and 14 along the width direction of the strip, and then bends the strip metal plate. Thus, the forming device 15A forms the strip metal plate into a tubular shape in which the two ends in the width direction of the strip metal plate, i.e., the +Y end and the -Y end, are aligned. For example, the forming device 15A forms the strip metal plate into the shape of a round tube. As a result, the forming device 15A forms a tubular body in which the Y ends are aligned with each other in the portion of the strip metal plate sent from the imprinting machines 13 and 14. The forming device 15A transports the tubular body to the welding machine 16A. In addition, the detailed structure of the forming device 15A will be described later.

[0047] The welding machine 16A welds the joint of the tubular body. The welding machine 16A is equipped with a welding device of a high-frequency induction heating method or a TIG (Tungsten Insert Gas) method, for example. The welding machine 16A welds the joint of the tubular body by the welding device to produce a welded pipe part at the +X end side of the strip metal plate. Then, the welding machine 16A conveys the welded pipe part of the strip metal plate to the drawing machine 17.

[0048] The drawing machine 17 adjusts the outer diameter and inner diameter of the welded pipe part produced by the welding machine 16A. Although not shown in the figure, the drawing machine 17 is provided with a die, and the die is provided with a through hole having a diameter smaller than the outer diameter of the welded pipe produced by the welding machine 16A and the same as the target outer diameter. Then, the drawing machine 17 passes the welded pipe part of the strip metal plate through the die and pulls the welded pipe part out of the die. Thus, the drawing machine 17 processes the welded pipe part of the strip metal plate to have the same outer diameter as the diameter of the through hole of the die.

[0049] Alternatively, although not shown, the drawing machine 17 does not include the above-mentioned die, but includes a plurality of rollers facing each other vertically or horizontally. Figure 2 On the other hand, although not shown in the figure, a groove with a semicircular cross section is formed along the circumferential direction on the cylindrical surface of each roller. In each roller group, by making the above grooves face each other, a circular space is formed between each other when viewed from the side. These circular spaces become smaller as they go toward the +X direction. In the drawing machine 17, by passing the welded pipe part of the strip metal plate through such a plurality of roller groups, the welded pipe part of the strip metal plate is processed to have the same outer diameter as the smallest circular space among the above circular spaces between the rollers.

[0050] The drawing machine 17 delivers the welded pipe portion of the strip metal plate processed by such a die or roller to Figure 2 The cutter 18 is shown.

[0051] The cutting machine 18 has a Figure 2 The cutter 181 moves in the direction from the front to the back, that is, in the Y direction. The cutter 18 moves the cutter 181 to cut the welded pipe portion of the strip metal plate processed by the drawing machine 17 into a desired length. Thus, the cutter 18 produces a welded pipe of a desired length. Then, the cutter 18 delivers the welded pipe formed into a desired length to the coiler 19.

[0052] The coiler 19 has a cylindrical coiling unit 191, and coils the welded pipe cut into a desired length by the cutter 18 around the coiling unit 191. The coiler 19 is thus capable of supplying the produced welded pipe to an external device.

[0053] In addition, the coiled strip metal plate installed on the uncoiler 10 is, for example, a rolled copper or copper alloy plate. In this case, the tempering may be O material, 1 / 2H material, or 1 / 4H material specified in JIS H3100. In addition, the width of the strip metal plate may be a size corresponding to the outer diameter of the welded pipe before the drawing machine 17 is reduced in diameter. For example, in the case where the outer diameter of the welded pipe before the drawing machine 17 is reduced in diameter is 7 mm, the width of the strip metal plate is 22.5 mm obtained by adding a welding allowance of 0.5 mm to the circumference obtained based on the outer diameter. The thickness of the strip metal plate may be 0.05 mm thicker than the thickness of the welded pipe before the drawing machine 17 is reduced in diameter, assuming that it is thinned by 0.05 mm in the marking machine 14.

[0054] Thus, in the welded pipe manufacturing device 1, the unwinder 10 pulls out the strip metal plate wound into a coil, and the marking machines 13 and 14 form grooves on the strip metal plate. Furthermore, the forming device 15A bends the strip metal plate in the Y direction to form a tubular body with the +Y end and the -Y end aligned. Then, the welding machine 16A welds the seam formed by the +Y end and the -Y end of the tubular body aligned to manufacture the welded pipe.

[0055] In the manufacture of the welded pipe, a forming device 15A including a blanking roll and a finishing roll is sometimes used. In this case, the total number of rolls obtained by adding the blanking rolls and the finishing rolls is large. Therefore, the forming device 15A becomes longer in the direction of feeding the strip metal plate, resulting in a larger size of the forming device 15A. In order to explain how the larger size of the forming device 15A is generated, Figure 3A to Figure 3C , Figure 4A as well as Figure 4B The blanking rolls and finishing rolls are shown in FIG.

[0056] Figure 3A to Figure 3C It is a cross-sectional view of the blanking rollers 151 to 156 and the formed strip-shaped metal plate 2 when the forming device 150 has the blanking rollers 151 to 156 . Figure 4A and Figure 4B It is a cross-sectional view of the finishing rolls 157 to 160 and the formed strip-shaped metal plate 2 when the forming device 150 includes the finishing rolls 157 to 160 .

[0057] like Figure 3A to Figure 3C As shown, the blanking rolls 151 to 156 are rolls that roughly form the strip-shaped metal plate 2 into an arc-shaped cross section between a pair of rolls.

[0058] Specifically, the opening rollers 151 to 156 are arranged in the order of the opening rollers 151 and 152, 153 and 154, 155 and 156 from the upstream side, that is, the -X side. Figure 3A to Figure 3CAs shown, a pair of a blanking roll 151 having a convex portion 161 protruding downward, i.e., protruding toward the -Z side, and a pair of a blanking roll 152 having a concave portion 162 recessed toward the -Z side are formed in the Z direction. In addition, a pair of a blanking roll 153 having a convex portion 163 protruding toward the -Z side and a blanking roll 154 having a concave portion 164 recessed toward the -Z side are formed in the Z direction. Furthermore, a pair of a blanking roll 155 having a convex portion 165 protruding toward the -Z side and a blanking roll 156 having a concave portion 166 recessed toward the -Z side are formed in the Z direction. Furthermore, in order to further bend the strip-shaped metal plate 2, the heights of the convex portions 161, 163, and 165 in the Z direction become higher in the order of the convex portions 161, 163, and 165 as they go toward the downstream side, i.e., the +X side, and the widths of the convex portions 161, 163, and 165 in the Y direction become narrower in this order. The depth of the recesses 162, 164, 166 in the Z direction increases in the order of the recesses 162, 164, 166, and the width of the recesses 162, 164, 166 in the Y direction decreases in this order. Furthermore, the YZ cross-sectional shape of the recesses 162, 164, 166 curves and increases in this order, approaching an arc shape.

[0059] In this way, in order to further bend the strip-shaped metal plate 2 toward the +X side, the blanking rolls 151 to 156 are composed of a plurality of rolls.

[0060] In addition, if Figure 4A and Figure 4B As shown, the finishing rolls 157 to 160 are rolls for finishing the metal strip 2 into a YZ circular cross-sectional shape by passing the metal strip 2 roughly formed into a circular cross-sectional shape between the paired rolls.

[0061] In detail, the finishing rollers 157 to 160 are arranged in the order of finishing rollers 157 and 158, 159 and 160 from the -X side. In addition, the finishing rollers 157 and 158 form a pair in the Z direction, the finishing roller 157 has a recessed portion that is recessed in a circular arc shape in cross section toward the +Z side and a fin portion 167 that protrudes from the recessed portion to the -Z side in a triangular shape in cross section, and the finishing roller 158 has a recessed portion that is recessed in a circular arc shape in cross section toward the -Z side. In addition, the finishing rollers 159 and 160 form a Z direction, the finishing roller 159 has the same recessed portion as the finishing roller 157, and has a triangular fin portion 169 that is smaller in cross section than the fin portion 167 of the finishing roller 157 in the recessed portion, and the finishing roller 160 has the same recessed portion as the finishing roller 158. Furthermore, the width of the fins 167 and 169 in the Y direction and the height in the Z direction decrease in the order of the fins 167 and 169. In other words, they decrease in the order of arrangement toward the +X side. The recessed portions of the finishing rolls 157 and 159 and the recessed portions of the finishing rolls 158 and 160 are opposed to each other in the Z direction to form a space with a circular cross section. The finishing rolls 157 to 160 have such a shape, and the strip metal plate 2 is finished-formed into a YZ cross-sectional circular shape in which the +Y end and -Y end of the strip metal plate 2 are close to each other as it moves toward the +X side.

[0062] Thus, the finishing rolls 157 to 160 are also composed of a plurality of rolls in order to gradually bend the strip metal plate 2, similarly to the blanking rolls 151 to 156. As a result, as described above, if the forming device 150 including the blanking rolls 151 to 156 and the finishing rolls 157 to 160 is used as the forming device 15A, the plurality of rolls are arranged in the direction in which the strip metal plate 2 is fed out, and as a result, the entire device becomes longer in the direction in which the strip metal plate 2 is fed out.

[0063] In addition, since a plurality of finishing rolls 157 to 160 and opening rolls 151 to 156 are provided, the device structure is complicated. Furthermore, the position adjustment of the plurality of finishing rolls 157 to 160 and opening rolls 151 to 156 is also complicated.

[0064] Furthermore, since the strip metal plate 2 is sandwiched and pressed between the pair of strip metal plate rolls 151 to 156, the grooves formed by the marking machines 13 and 14 on the strip metal plate 2 may be crushed. As a result, the heat exchange performance of the produced welded pipe may be reduced.

[0065] Therefore, in the manufacturing device 1 of the welded pipe, in order to miniaturize the device, simplify the device structure, and maintain the shape of the groove formed in the strip metal plate 2, the forming device 15A is equipped with a pipe forming member called a guide shoe, which has a through hole for the strip metal plate 2 to pass through, and the strip metal plate 2 is formed into a pipe shape through the inner wall of the through hole. Figures 5 to 9 , Fig. 10A as well as Fig. 10B , the structure of the molding device 15A is explained.

[0066] Figure 5 It is a perspective view of the forming device 15A included in the welded pipe manufacturing apparatus 1 according to the first embodiment. Figure 6 It is a cross-sectional view of the edge rollers 20 and 21 included in the molding device 15A. Figure 7 It is a cross-sectional view of the side rollers 30 and 31 included in the molding device 15A. Figure 8 It is a perspective view of the pipe forming part 40 included in the forming device 15A. Fig. 9 yes Figure 8 A magnified view of region IX is shown. Fig. 10A It is a cross-sectional view of the strip-shaped metal plate 2 after being bent by the side rollers 30 and 31 . Fig. 10B 4 is a cross-sectional view of the tube 3 formed by the tube forming member 40 .

[0067] In addition, for ease of understanding, Figure 5 The figure shows a conceptual molding device 15A with details omitted. Figure 8 In the figure, the strip-shaped metal plate 2 to be processed is omitted.

[0068] like Figure 5 As shown, the forming device 15A includes: edge rollers 20, 21, which bend the edge portions of the strip metal plate 2 in the width direction; side rollers 30, 31, which press the strip metal plate 2, which has been bent in the width direction by the edge rollers 20, 21, from the side, i.e., the side direction, to further bend it; and a tube forming component 40, which forms the strip metal plate 2, which has been bent by the side rollers 30, 31, into a tube shape.

[0069] In order to sandwich the strip-shaped metal plate 2 for forming, the edge rollers 20 and 21 are both cylindrical in shape. They have the same outer diameter. Moreover, the edge rollers 20 and 21 are arranged in the vertical direction, i.e., the Z direction, with the cylindrical axes D1 and D2 facing the left-right direction, i.e., the Y direction. In order to form the strip-shaped metal plate 2, the edge rollers 20 and 21 have a gap between them in the Z direction. And, the strip-shaped metal plate 2 passes through the gap.

[0070] In detail, Figure 6 As shown, in order to bend the width direction end, i.e., the Y direction end, of the strip-shaped metal plate 2, the edge roller 20 has the corners of both ends of the cylinder rounded into arc shapes in a cross section when cut along the cylinder axis D1, for example, in a cross section when cut along the YZ plane. In order to bend the Y direction end of the strip-shaped metal plate 2, the length of the edge roller 20 along the outer shape from the -Y end to the +Y end is the same as or greater than the width of the strip-shaped metal plate 2.

[0071] On the other hand, in order to form the strip metal plate 2 between the edge roller 20, the width of the edge roller 21 in the direction of the column axis D2, that is, the width in the Y direction, is larger than the width of the strip metal plate 2. Or it is larger than the width of the edge roller 20 in the direction of the column axis D1, that is, the width in the Y direction. In addition, in order to bend the strip metal plate 2 into a shape along the outer peripheral shape of the edge roller 20, the edge roller 21 has a recessed portion 22, which is recessed into the outer peripheral shape of the edge roller 20 in a cross section when cut along the column axis D2, for example, in a cross section when cut along the YZ plane.

[0072] The concave portion 22 has both ends rounded into arc shapes in the above-mentioned cross section, and the bottom is formed into a flat shape. Moreover, the concave portion 22 extends along the outer periphery of the edge roller 20 while maintaining its cross-sectional shape. Thus, the concave portion 22 is formed over the entire outer periphery of the edge roller 20. By forming the concave portion 22 in such a shape, it is recessed into a shape similar to the outer peripheral shape of the edge roller 20 in the above-mentioned cross section. Moreover, the concave portion 22 and the edge roller 20 are opposed to each other in the Z direction, and the inner wall of the concave portion 22 is separated from the outer periphery of the edge roller 20 by a certain distance. As a result, there is a gap 23 between the concave portion 22 and the edge roller 20, the central portion of which is straight in the above-mentioned cross section and the two end portions are curved into arc shapes. The strip-shaped metal plate 2 with its width direction facing the Y direction passes through the gap 23.

[0073] The edge rollers 20 and 21 are rotated about the column axes D1 and D2 by a driving device (not shown), such as a motor. Figure 6 The edge rollers 20 and 21 rotate counterclockwise when viewed from the +Y side of the figure. The edge rollers 21 rotate clockwise when viewed from the +Y side of the figure. Thus, the edge rollers 20 and 21 bend both ends of the strip metal plate 2 in the width direction passing through the gap 23 therebetween into a cross-sectional arc shape. In other words, the edge rollers 20 and 21 bend the strip metal plate 2 into a disk shape.

[0074] Furthermore, if Figure 5 As shown, the edge rollers 20 and 21 rotate to convey the bent strip metal plate 2 to the downstream side, i.e., the +X direction. Side rollers 30 and 31 are provided at the +X side of the edge rollers 20 and 21, and the strip metal plate 2 bent by the edge rollers 20 and 21 is conveyed to the side rollers 30 and 31.

[0075] On the other hand, the side rollers 30 and 31 are formed in the shape of disks with the same diameter. Moreover, the side rollers 30 and 31 are arranged in the Y direction with the disk axes D3 and D4 facing the Z direction. The strip metal plate 2 bent in the width direction by the edge rollers 20 and 21 passes between the side rollers 30 and 31 in the Y direction. Moreover, the disk end faces of the side rollers 30 and 31 are respectively in contact with the bent width direction ends of the strip metal plate 2.

[0076] In detail, Figure 7 As shown, the disc end surfaces of the side rollers 30 and 31 are formed with arc-shaped recesses 32 and 33 in the cross section when cut along the radial direction. Moreover, the recesses 32 and 33 are opposed to each other at a certain distance. Thus, a gap 34 is formed between the recesses 32 and 33, and the maximum width W2 of the gap 34 is less than Figure 6 The width W1 of the strip metal plate 2 after being bent by the edge rollers 20 and 21 is shown. Figure 7 As shown, the bent metal strip 2 passes through the gap 34 .

[0077] The side rollers 30 and 31 are rotated about the disk axes D3 and D4 by a driving device (not shown), such as a motor. Figure 7 The side rollers 30 and 31 rotate clockwise when viewed from the +Z side of the figure. In addition, the side rollers 31 rotate counterclockwise when viewed from the +Z side of the figure. As a result, the side rollers 30 and 31 further bend the bent strip metal plate 2 passing through the gap 34. In detail, the maximum width W2 of the gap 34 is smaller than the bent strip metal plate 2. Therefore, the widthwise ends of the strip metal plate 2 abut against the inner walls of the arc-shaped cross-sections of the recesses 32 and 33 of the side rollers 30 and 31, respectively. As a result, the widthwise ends of the strip metal plate 2 are respectively smaller than the widthwise ends of the recesses 32 and 33 of the side rollers 30 and 31. Figure 6 The shape shown is further bent and deformed into a circular arc shape in cross section. Thus, the side rollers 31 and 32 deform the strip-shaped metal plate 2 into a state that is more curved than a semicircle.

[0078] Furthermore, if Figure 5 As shown, the side rollers 30 and 31 convey the bent strip-shaped metal plate 2 in the +X direction by rotating. A pipe forming unit 40 is provided on the +X side of the side rollers 30 and 31 , and the strip-shaped metal plate 2 is conveyed to the pipe forming unit 40 .

[0079] The tube forming member 40 is a member for forming the strip metal plate 2 bent in the width direction into a tube shape. Figure 8 As shown, the tube forming member 40 includes a main body 41 that forms the strip metal plate 2 into a tube shape, and a guide 42 that guides the width direction end of the strip metal plate 2 when the main body 41 forms the strip metal plate 2 into a tube shape.

[0080] The main body 41 has a rectangular parallelepiped shape, with each face facing the directions X, Y, and Z. A through hole 43 extending from the -X face to the +X face is formed on the -X face of the main body 41 to allow the strip metal plate 2 to pass therethrough and be formed into a tubular shape inside.

[0081] The through hole 43 is a circular hole. Specifically, the through hole 43 has a shape in which the diameter decreases as it moves from the opening 431 formed on the -X surface of the main body 41 toward the +X direction. As described above, the strip metal plate 2 is bent by the side rollers 30 and 31 to be larger than a semicircle. The opening 431 located on the -X surface of the main body 41 is formed to have an inner diameter larger than the outer diameter of the strip metal plate 2. Moreover, the strip metal plate 2 extending from the side rollers 30 and 31 is inserted into the opening 431. Furthermore, the side rollers 30 and 31 feed the strip metal plate 2, whereby the strip metal plate 2 is fed into the interior from the opening 431 toward the +X direction.

[0082] On the other hand, the opening 432 formed on the +X side of the through hole 43 is formed to have an inner diameter having a circumference of the following length: the length is obtained by adding the length of the outer circumference in the width direction of the strip metal plate 2 to the rolling length when being formed by the tube forming member 40. As a result, the opening 432 is formed to have an inner diameter of the same diameter as the outer diameter of the tube formed by the strip metal plate 2. As a result, the space surrounded by the inner wall of the through hole 43 gradually narrows from the opening 431 located on the -X surface of the main body 41 toward the opening 432 located on the +X surface of the main body 41. As a result, when the strip metal plate 2 is fed from the opening 431, it abuts against the inner wall of the through hole 43 and is reduced in diameter, and the end faces of the strip metal plate 2 in the width direction approach each other as they move from the opening 431 to the opening 432. Moreover, the end faces of the strip metal plate 2 in the width direction face each other at the opening 432 with a small gap left. As a result, the strip metal plate 2 is formed into a tube shape at the opening 432. The through hole 43 has the above-mentioned shape, thereby forming the belt-shaped metal plate 2 into a tube shape.

[0083] The main body 41 has the through hole 43 of such a shape, thereby forming the strip metal plate 2 into a tube shape in a smaller space than the above-mentioned blanking rolls 151 to 156 and finishing rolls 157 to 160. In addition, unlike the above-mentioned blanking rolls 151 to 156 and finishing rolls 157 to 160, the strip metal plate 2 is formed into a tube shape without the need for position adjustment between the components.

[0084] Furthermore, a groove 433 is formed on the inner wall of the through hole 43 so that the guide portion 42 can be fitted therein. The groove 433 extends linearly from an opening 431 located on the −X plane of the main body 41 toward an opening 432 located on the +X plane and is parallel to the X axis.

[0085] The groove 433 is cut from the inner wall of the through hole 43 to the +Z surface of the main body 41. The YZ cross section of the groove 433 is a trapezoidal shape with the upper base facing the -Z direction. In contrast, the guide portion 42 includes a support portion 421 having a cross-sectional shape that is the same as the YZ cross section of the groove 433. The support portion 421 is embedded in the groove 433. Thus, the groove 433 holds the guide portion 42.

[0086] In addition to the above-mentioned support portion 421 , the guide portion 42 further includes a protrusion 422 , which is supported by the support portion 421 and protrudes from the inner wall of the through hole 43 having the groove 433 to the internal space of the through hole 43 when the support portion 421 is embedded in the groove 433 .

[0087] The protrusion 422 is a member for guiding the end face of the strip metal plate 2 in the width direction when the strip metal plate 2 is fed from the side rollers 30 and 31 into the through hole 43. The protrusion 422 has a trapezoidal shape with the upper bottom facing the -Z direction in the YZ cross section. Fig. 9 The width W3 shown is less than Fig. 10A The opening width W4 between the end faces 25 and 26 in the width direction of the strip metal plate 2 bent into a larger shape than a semicircle by the side rollers 31 is shown. As a result, when the strip metal plate 2 bent by the side rollers 31, 31 is fed into the through hole 43, the protrusion 422 can enter between the end faces 25 and 26 of the strip metal plate 2. When the strip metal plate 2 is fed into the through hole 43, the protrusion 422 enters between the end faces 25 and 26 of the strip metal plate 2, and defines the positions of the end faces 25 and 26.

[0088] In addition, when the strip metal plate 2 is fed into the through hole 43, in order to guide the end faces 25 and 26 of the strip metal plate 2 in a fixed direction, as shown in FIG. Fig. 9 As shown, the protrusion 422 has side walls 423 and 424 located in the inner circumferential direction of the through hole 43 .

[0089] Specifically, as described above, the protrusion 422 has a trapezoidal shape with the upper base facing the -Z direction in the YZ cross section. Figure 8 As shown, the YZ cross-sectional trapezoid of the projection 422 has a pair of waists 4 and 5 that are continuous with the YZ cross-sectional shape of the support portion 421, that is, a pair of waists of the trapezoid with the upper base facing the -Z direction. Moreover, while the projection 422 has the waists 4 and 5 of the trapezoid in the YZ cross section, it extends straight in the X direction. As a result, the projection 422 has waists 4 and 5 corresponding to the waists 4 and 5 in the YZ cross section. Fig. 9 Side walls 423, 424 are shown.

[0090] As described above, when the strip metal plate 2 is fed into the through hole 43, since the inner diameter of the through hole 43 decreases as it moves toward the +X direction, the strip metal plate 2 abuts against the inner wall of the through hole 43 and decreases in diameter as it moves toward the +X direction. As a result, the end faces 25 and 26 of the strip metal plate 2 in the width direction approach each other as it moves toward the +X direction. When the strip metal plate 2 is fed into the through hole 43, in order to guide the end faces 25 and 26 of the strip metal plate 2, as shown in FIG. Fig. 10A As shown, the protrusion 422 from the side wall 423 to the side wall 424, Figure 8 The width W3 at the root portion shown in FIG. 1 decreases as it moves toward the +X direction. Moreover, the width W3 of the protrusion 422 is 0 or very small at the opening 432 of the through hole 43 located on the +X side. Fig. 9 The angle θ shown, in other words, the angle θ of the wall surface of the side wall 423 relative to the wall surface of the side wall 424 decreases as it goes toward the +X direction. With such a structure, when the strip metal plate 2 is fed into the through hole 43, the side walls 423 and 424 restrict the end faces 25 and 26 of the strip metal plate 2 to positions corresponding to the reduced diameter of the strip metal plate 2. In addition, the side walls 423 and 424 make the angle of the end faces 25 and 26 of the strip metal plate 2 relative to the plate surface become an angle corresponding to the reduced diameter of the strip metal plate 2. Moreover, the side walls 423 and 424 guide the end faces 25 and 26 of the strip metal plate 2.

[0091] In addition, the ratio at which the width W3 of the protrusion 422 decreases toward the +X direction is preferably the same as the ratio at which the end surfaces 25 and 26 in the width direction of the strip metal plate 2 approach toward the +X direction. In addition, the protrusion 422 preferably extends from the opening 431 of the through hole 43 on the -X side to the front of the opening 432 on the +X side.

[0092] The wall height of the side walls 423 and 424, that is, the protrusion length L1 of the side walls 423 and 424 from the through hole 43, is equal to the opening 431 of the through hole 43 on the -X side. Fig. 10A The thickness T of the strip metal plate 2 shown is the same as or longer than the thickness T of the strip metal plate 2. Figure 8 As shown, the protruding length L1 becomes shorter as it goes toward the +X direction. Therefore, when the strip metal plate 2 is fed into the through hole 43, the side walls 423 and 424 come into contact with at least the outer peripheral portions of the end faces 25 and 26, and the side walls 423 and 424 are reduced. As a result, at least the outer peripheral portions of the end faces 25 and 26 are shaped and adjusted to the shape of the side walls 423 and 424.

[0093] In addition, the side walls 423 and 424 face a direction intersecting the inner circumferential direction of the through hole 43. Specifically, they face a direction perpendicular to the inner circumferential direction of the through hole 43 and extend in the perpendicular direction. Therefore, when the side walls 423 and 424 are reduced as described above, the end faces 25 and 26 in the width direction of the strip metal plate 2 are not formed into Fig. 10B The YZ cross section shown by the dotted line is V-shaped, but the end faces 25 and 26 are formed into Fig. 10B If the end faces 25 and 26 are formed as in the YZ section, Fig. 10BIf the end faces 25 and 26 are welded to produce a welded pipe, a defective weld may occur in the welded portion between the end faces 25 and 26. However, the side walls 423 and 424 are formed into a V-shaped shape as shown by the dotted line. Fig. 10B Therefore, when manufacturing the welded pipe, welding defects are less likely to occur and the welding strength is improved.

[0094] In this way, the tube forming member 40 forms the strip metal plate 2 into a tube shape by allowing the strip metal plate 2 to follow the inner wall of the through hole 43 formed in the main body 41. In addition, the guide portion 42 of the tube forming member 40 extends in the +X direction and has a protrusion 422 whose width W3 decreases as it goes toward the +X direction, thereby forming the end faces 25 and 26 in the width direction of the strip metal plate 2 formed into a tube shape into parallel shapes to suppress welding defects.

[0095] In order to prevent the strip metal plate 2 from being easily damaged, the main body 41 is preferably formed of a material softer than the metal material of the strip metal plate 2. For example, when the strip metal plate 2 is pure copper, the main body 41 is preferably formed of a metal or resin softer than pure copper. As a specific example, the main body 41 is preferably formed of a single-piece cast nylon.

[0096] In addition, since a large force is applied to the protrusion 422 when the strip-shaped metal plate 2 is formed, the guide portion 42 is preferably formed of a material harder than the metal material of the strip-shaped metal plate 2. For example, the material of the guide portion 42 is preferably a superalloy or a superhard alloy such as an iron-based superalloy, a cobalt-based superalloy, or a nickel-based superalloy. Alternatively, when the material of the guide portion 42 is a resin, such as single-piece cast nylon, it is preferably covered with a hard alloy.

[0097] As described above, a large force is applied to the protrusion 422 during molding. Therefore, in order to withstand this force, the guide portion 42 is preferably formed of a material having a high compressive strength and a high wear resistance compared to the strip metal plate 2. In addition, only the guide portion 42 in the tube molding component 40 may be formed of such a material, in which case, the guide portion 42 is preferably formed of a material having a high compressive strength and a high wear resistance compared to the main body 41. In addition, only the protrusion 422 in the guide portion 42 may be formed of such a material. For example, in the case where the strip metal plate 2 is formed of pure copper, at least the protrusion 422 in the guide portion 42 is preferably formed of a superhard alloy. This is because, if it is such a material, at least the protrusion 422 is formed of a material having a high compressive strength and a high wear resistance compared to the strip metal plate 2.

[0098] Furthermore, the main body 41 and the guide 42 may be formed integrally. In addition, the main body 41 and the guide 42 may be mechanically joined by fastening members such as bolts and screws.

[0099] In addition, the main body 41 and the guide part 42 described in the first embodiment are examples of the tube forming part and the end surface forming part mentioned in the present disclosure. In addition, the opening 431 located on the -X side and the opening 432 located on the +X surface of the through hole 43 formed in the main body 41 are examples of the inlet for feeding the strip metal plate 2 and the outlet for feeding the strip metal plate 2 mentioned in the present disclosure. The side walls 423 and 424 are examples of the first side wall and the second side wall mentioned in the present disclosure. The edge rollers 20 and 21 and the side rollers 30 and 31 are examples of the roller device mentioned in the present disclosure. The strip metal plate 2 formed into a tube shape is an example of the tubular metal plate mentioned in the present disclosure.

[0100] As described above, in the welded pipe manufacturing apparatus 1 of the first embodiment, the main body 41 provided in the forming device 15A has the through hole 43 whose diameter decreases from the opening 431 on the -X side of the through hole 43 toward the opening 432 on the +X side. Then, by feeding the strip metal plate 2 bent in the width direction from the opening 431 on the -X side of the through hole 43, the main body 41 brings the end faces 25 and 26 in the width direction of the strip metal plate 2 closer together as it moves from the opening 431 on the -X side of the through hole 43 toward the opening 432 on the +X side, and forms the strip metal plate 2 into a tube shape in which the end faces 25 and 26 face each other at the opening 432. Therefore, the welded pipe manufacturing apparatus 1 can form the strip metal plate 2 into a tube shape without complicated positional adjustment of the components in the forming device 15A.

[0101] In addition, in the forming device 15A, the tube forming component 40 has the above-mentioned main body 41, thereby being able to form the strip metal plate 2 into a tube shape, so that the device can be miniaturized compared to the forming device 150 having multiple rollers such as blanking rollers 151 to 156 and finishing rollers 157 to 160.

[0102] In the tube forming member 40, the main body 41 forms the strip metal plate 2 into a tube shape along the inner wall of the through hole 43. Therefore, unlike the case of the above-mentioned blanking rollers 151 to 156, the strip metal plate 2 is not pressed. As a result, the grooves formed by the marking machines 13 and 14 of the strip metal plate 2 are not crushed. According to the forming device 15A, by having grooves on the inner wall, a welded tube with improved heat exchange performance can be produced.

[0103] In the manufacturing device 1 of the welded pipe, the guide part 42 provided in the pipe forming member 40 has a protrusion 422, which protrudes from the inner wall of the through hole 43 and has side walls 423 and 424 in the inner circumferential direction of the through hole 43. In addition, in the protrusion 422, the side walls 423 and 424 extend in the direction from the opening 431 located on the -X side of the through hole 43 toward the opening 432 located on the +X side, and the width from the side wall 423 to the side wall 424 decreases from the opening 431 toward the opening 432. And, the side walls 423 and 424 are inserted between the end faces 25 and 26 in the width direction of the strip metal plate 2, and the strip metal plate 2 is fed from the opening 431 located on the -X side of the through hole 43, and the end faces 25 and 26 are formed into the shape of the side walls 423 and 424. Furthermore, the side walls 423 and 424 make the end faces 25 and 26 face each other at the opening 432 located on the +X side of the through hole 43. As a result, when the end faces 25 and 26 are welded to produce a welded pipe, the occurrence of welding defects can be suppressed. In addition, since the end faces 25 and 26 are welded with high strength, the strength of the welded pipe is high.

[0104] In addition, in the tube forming member 40, since the side walls 423 and 424 of the protrusion 422 are perpendicular to the inner peripheral direction of the through hole 43, the end faces 25 and 26 in the width direction of the strip metal plate 2 are formed parallel to each other and perpendicular to the outer peripheral surface. As a result, the occurrence of welding defects is further suppressed. In addition, the strength of the welded pipe is further improved. Furthermore, the seam of the welded pipe formed by the end faces 25 and 26 is suppressed from shifting.

[0105] (Implementation Method 2)

[0106] In the first embodiment, the edge rollers 20, 21 and the side rollers 30, 31 provided in the forming device 15A are rotated by a driving device such as a motor, thereby conveying the strip-shaped metal plate 2. However, the forming device 15A is not limited thereto. The forming device 15A may also include components other than the edge rollers 20, 21 and the side rollers 30, 31, and the strip-shaped metal plate 2 may be conveyed by the components.

[0107] In the second embodiment, the forming device 15B includes a conveying device 50 for conveying the strip-shaped metal plate 2 .

[0108] Below, refer to Fig.11 and Fig.12 Next, a welded pipe manufacturing apparatus 1 according to a second embodiment will be described. In the second embodiment, the description will be mainly based on the configuration different from the first embodiment.

[0109] Fig.11 It is a top view of the forming device 15B provided in the welded pipe manufacturing apparatus 1 according to the second embodiment. Fig.1215B is a perspective view of the molding device 15B. Fig.11 In order to facilitate understanding, the thickness of the annular belts 51 and 52 is emphasized. Fig.11 and Fig.12 In FIG. 1 , the rotation directions of the edge rolls 20 , 21 and the side rolls 30 , 31 when the molding device 15B is in operation are indicated by arrows A3 to A6 .

[0110] like Fig.11 and Fig.12 As shown, the forming device 15B has a conveying device 50 on the downstream side of the tube forming component 40, that is, on the +X side, and the conveying device 50 forms the tube forming component 40 of the strip metal plate 2 into a tubular body portion, that is, Fig. 10B The pipe 3 shown is conveyed in the +X direction. The pipe 3 is an example of a tubular metal plate referred to in the present disclosure.

[0111] like Fig.11 and Fig.12 As shown, the conveying device 50 has endless belts 51 and 52 between which the tube 3 is sandwiched. These endless belts 51 and 52 are described in detail. The endless belt 51 is hung around a cylindrical driving shaft 511 and a driven shaft 512 whose axial direction is oriented in the Z direction and arranged in the X direction. Moreover, the driving shaft 511 and the driven shaft 512 are arranged close to the +Y side of the tube 3, so that the portion of the endless belt 51 hung between the driving shaft 511 and the driven shaft 512 and extending in the X direction contacts the tube 3 from the +Y side. In this state, the driving shaft 511 is rotated by a driving device not shown, such as a motor, so that the endless belt 51 rotates as shown by arrow A1, and the tube 3 is conveyed in the +X direction.

[0112] In addition, the endless belt 52 also conveys the tube 3 in the +X direction by the same structure as the endless belt 51. Specifically, the endless belt 52 is hung around a cylindrical drive shaft 521 and a driven shaft 522 whose axial direction is oriented in the Z direction and arranged in the X direction. Moreover, since the drive shaft 521 and the driven shaft 522 are arranged close to the -Y side of the tube 3, the portion of the endless belt 52 hung between the drive shaft 521 and the driven shaft 522 and extending in the X direction contacts the tube 3 from the -Y side. In this state, the drive shaft 521 rotates at the same rotation speed as the drive shaft 511 by the same structure as the drive shaft 511, so that the endless belt 52 rotates as shown by the arrow A2, and the tube 3 is conveyed in the +X direction.

[0113] The endless belts 51 and 52 sandwich the tube 3 from the Y direction. Furthermore, the endless belts 51 and 52 respectively convey the tube 3 in the +X direction, thereby conveying the tube 3 with a stronger force, for example, a force stronger than the force of the edge rollers 20, 21 and the side rollers 30, 31 to convey the strip-shaped metal plate 2. As a result, in the forming device 15B, the tube 3 is reliably conveyed from the forming device 15B.

[0114] As described above, in the welded pipe manufacturing apparatus 1 of the second embodiment, since the forming device 15B includes the conveying device 50 having the endless belts 51 and 52, the formed pipe 3 is conveyed with a strong force. Therefore, even when the force of the edge rollers 20 and 21 and the side rollers 30 and 31 to send out the strip-shaped metal plate 2 is weak, the formed pipe 3 can be reliably conveyed.

[0115] (Implementation 3)

[0116] In the first embodiment, the welding machine 16A includes a high-frequency induction heating type or TIG type welding device that performs welding in the atmosphere. However, the welding machine 16A is not limited thereto. The welding machine 16A may include a welding device of another type.

[0117] In the welded pipe manufacturing apparatus 1 according to the third embodiment, the welding machine 16C includes a welding device that performs welding in a vacuum.

[0118] Below, refer to Fig.13 Next, a welded pipe manufacturing apparatus 1 according to a third embodiment will be described. In the third embodiment, the description will be mainly focused on the configuration different from the first and second embodiments.

[0119] Fig.13 It is a cross-sectional view of a welding machine 16C included in the welded pipe manufacturing apparatus 1 according to the third embodiment.

[0120] like Fig.13 As shown, the welding machine 16C includes an electron beam welding device 60 having a vacuum chamber 61 .

[0121] Although not shown, the electron beam welding device 60 includes a cathode portion that generates an electron beam when a voltage is applied, an anode portion that accelerates the electron beam, and an electron lens portion that converges or deflects the electron beam. The cathode portion, the anode portion, and the electron lens portion are housed in a vacuum chamber 61 .

[0122] On the other hand, in the manufacturing device 1 of the welded pipe, a vacuum chamber 70 is provided adjacent to the vacuum chamber 61. The molding device 15A described in the first embodiment is accommodated in the vacuum chamber 70. Specifically, the vacuum chamber 70 is formed with an inlet 71 and an outlet 72 on the -X side and the +X side. The inlet 71 is formed in a rectangular shape slightly larger than the cross section of the strip metal plate 2, and the strip metal plate 2 passes through the inlet 71. In addition, the outlet 72 is formed in a circular shape slightly larger than the cross section of the welded pipe 6 manufactured by the manufacturing device 1, and the welded pipe 6 manufactured by the manufacturing device 1 passes through the outlet 72.

[0123] In addition, the edge rollers 20, 21, the side rollers 30, 31, and the tube forming member 40 of the forming device 15A described in Embodiment 1 are accommodated inside the vacuum chamber 70. Then, these edge rollers 20, 21, the side rollers 30, 31, and the tube forming member 40 form the strip metal plate 2 entering the inside of the vacuum chamber 70 from the inlet 71 into a tube shape, and produce the tube 3 at the +X portion of the strip metal plate 2.

[0124] A connecting hole 73 of the vacuum chamber 70 is formed on the +Z side of the manufactured tube 3. In addition, a connecting hole 62 is also formed in the vacuum chamber 61, and the connecting hole 62 is located on the +Z side of the connecting hole 73. As a result, the connecting hole 62 is connected to the connecting hole 73. In the vacuum chamber 61, the electron beam welding device 60 emits the electron beam generated by the cathode toward the connecting hole 62 and the connecting hole 73. In addition, the electron beam welding device 60 bombards the electron beam with the joint formed by the end faces 25 and 26 of the tube 3 formed in the vacuum chamber 70. Thus, the electron beam welding device 60 welds the joint of the tube 3 to manufacture the welded tube 6.

[0125] On the other hand, the edge rollers 20, 21 and the side rollers 30, 31 of the forming device 15A feed the strip metal plate 2 in the +X direction. As a result, the welded pipe 6 formed by the electron beam welding device 60 connected to the strip metal plate 2 is fed in the +X direction. As a result, the formed welded pipe 6 is supplied from the outlet 72 of the vacuum chamber 70 to the outside of the vacuum chamber 70. Figure 2 The drawing machine 17, the cutting machine 18 and the winding machine 19 are shown. In addition, since the structures of these drawing machine 17, the cutting machine 18 and the winding machine 19 are demonstrated in Embodiment 1, their description is abbreviate|omitted in Embodiment 3.

[0126] return Fig.13 In order to make the vacuum chamber 70 to be the vacuum degree required for electron beam welding, a vacuum pump (not shown) is connected to the vacuum chamber 70. The vacuum pump makes the vacuum chamber 70 to be a certain vacuum degree, and in order to maintain the vacuum degree, it must have an exhaust performance corresponding to the volume of the vacuum chamber 70. Therefore, if the volume of the vacuum chamber 70 is large, it is necessary to connect a large vacuum pump with high exhaust performance to the vacuum chamber 70.

[0127] However, as described in the first embodiment, the forming device 15A is small compared to the forming device 150 having a plurality of rollers such as the blanking rollers 151 to 156 and the finishing rollers 157 to 160. As a result, the volume of the vacuum chamber 70 is smaller than that of the case where the forming device 150 is accommodated. In the manufacturing device 1 of the welded pipe 6 of the third embodiment, even if a small vacuum pump is connected to the vacuum chamber 70, the inside of the vacuum chamber 70 can be made into a vacuum degree required for electron beam welding. In addition, it is easy to maintain the vacuum degree.

[0128] As described above, in the manufacturing device 1 of the welded pipe 6 of the third embodiment, the welding machine 16C is provided with the electron beam welding device 60, and the electron beam welding device 60 has the vacuum chamber 61 which accommodates the forming device 15A. In the manufacturing device 1 of the welded pipe 6 of the third embodiment, the forming device 15A is small, so the volume of the vacuum chamber 61 is small, and as a result, the vacuum degree required for electron beam welding can be easily achieved. In addition, since the volume of the vacuum chamber 61 is small, it is also easy to maintain the required vacuum degree.

[0129] In addition, if Fig.13 As shown, the inlet 71 and the outlet 72 of the vacuum chamber 70 can be connected to the outside via vacuum chambers 75 and 76 whose vacuum degree is lower than that of the inside of the vacuum chamber 70. This is because, if such a structure is used, the inlet 71 and the outlet 72 of the vacuum chamber 70 are not directly connected to the space of atmospheric pressure, so it is easy to maintain the vacuum degree of the vacuum chamber 70.

[0130] In the above, the forming devices 15A, 15B, the manufacturing device 1 of the welded pipe 6, the forming method of the pipe 3, and the manufacturing method of the welded pipe 6 of the embodiments 1 to 3 of the present disclosure are described, but the forming devices 15A, 15B, the manufacturing device 1 of the welded pipe 6, the forming method of the pipe 3, and the manufacturing method of the welded pipe 6 are not limited to these.

[0131] In the above-mentioned first to third embodiments, the forming devices 15A and 15B include edge rollers 20 and 21, side rollers 30 and 31, and a tube forming member 40. However, the forming devices 15A and 15B are not limited thereto. In the present disclosure, the forming devices 15A and 15B may include at least a tube forming member 40, i.e., a tube forming section, which has a through hole 43 whose diameter decreases from the inlet toward the outlet, and by feeding the strip metal plate 2 bent in the width direction from the inlet of the through hole 43, the end faces 25 and 26 of the strip metal plate 2 in the width direction approach each other from the inlet toward the outlet, and the strip metal plate 2 is formed into a tubular metal plate with the end faces 25 and 26 facing each other at the outlet. For example, in the forming devices 15A and 15B, instead of the edge rollers 20 and 21 and the side rollers 30 and 31, a device for forming the strip metal plate 2 bent in the width direction toward the inlet of the through hole 43 may be provided.

[0132] In Embodiments 1 to 3, the tube forming member 40 provided in the forming devices 15A and 15B has a rectangular parallelepiped shape, but the outer shape of the tube forming member 40 is arbitrary as long as the above conditions are satisfied. For example, the outer shape of the tube forming member 40 may be cylindrical.

[0133] In the above-mentioned first to third embodiments, the tube forming member 40 has the guide portion 42 for forming the end faces 25 and 26 in the width direction of the strip metal plate 2 formed into a tube shape into parallel shapes, but the tube forming member 40 is not limited to this. As described above, the tube forming member 40 only needs to have the through hole 43 whose diameter decreases as it moves from the inlet to the outlet, and by feeding the strip metal plate 2 bent in the width direction from the inlet of the through hole 43, the end faces 25 and 26 in the width direction of the strip metal plate 2 are brought closer as it moves from the inlet to the outlet, and the strip metal plate 2 is formed into a tubular metal plate with the end faces 25 and 26 facing each other at the outlet. This is because even in such a mode, the strip metal plate 2 can be formed into a tubular metal plate without complicated position adjustment of the components. Therefore, in order to shape the end faces 25 and 26 of the strip metal plate 2 in the width direction into parallel shapes to suppress welding defects, the pipe forming member 40 may have a guide portion 42, but the guide portion 42 may be omitted when it is not necessary to suppress welding defects.

[0134] In the above-mentioned embodiments 1 to 3, the protruding length L1 of the side walls 423 and 424 of the protrusion 422 provided in the guide portion 42 becomes shorter as it goes from the entrance of the through hole 43 toward the exit. However, the protrusion 422 is not limited to this. The protrusion 422 only needs to protrude from the inner wall of the through hole 43, and has the side walls 423 and 424 in the inner circumferential direction of the through hole 43, and the side walls 423 and 424 extend in the direction from the entrance toward the exit, and the width from the side wall 423 to the side wall 424 becomes smaller as it goes from the entrance toward the exit. Therefore, the protruding length L1 of the side walls 423 and 424 does not need to become shorter as it goes from the entrance of the through hole 43 toward the exit. For example, the protruding length L1 may be fixed. This is because, in such a method, it is sufficient that the width from the side wall 423 to the side wall 424 becomes smaller as it goes from the entrance toward the exit.

[0135] In the above-mentioned embodiments 1 to 3, in order to bend the strip metal plate 2 in the width direction and form it into the shape of a round tube, the tube forming member 40 has a through hole 43 in the shape of a truncated cone. However, the through hole 43 is not limited to this. The through hole 43 only needs to have a diameter that decreases as it moves from the inlet toward the outlet. For example, the through hole 43 may have an elliptical cross section in addition to a circular cross section. In this way, the strip metal plate 2 can be formed into the shape of a tube with an elliptical cross section. In addition, the through hole 43 may also have a flat cross section.

[0136] In the first to third embodiments, the manufacturing apparatus 1 of the welded pipe 6 includes the reservoir 12. However, the manufacturing apparatus 1 of the welded pipe 6 is not limited thereto. In the manufacturing apparatus 1 of the welded pipe 6, the reservoir 12 may be an arbitrary structure. For example, when the production efficiency may also be reduced, the manufacturing apparatus 1 of the welded pipe 6 may not include the reservoir 12.

[0137] In the first to third embodiments, the manufacturing device 1 of the welded pipe 6 includes the marking machines 13 and 14. However, the manufacturing device 1 of the welded pipe 6 is not limited thereto. In the manufacturing device 1 of the welded pipe 6, the marking machines 13 and 14 may be any structure. For example, when manufacturing a welded pipe 6 without a groove, the manufacturing device 1 of the welded pipe 6 may not include the marking machines 13 and 14. In addition, when manufacturing a welded pipe 6 with a groove, the manufacturing device 1 of the welded pipe 6 only needs to include at least one marking machine 13 and 14 in order to form the groove.

[0138] In the first to third embodiments, the manufacturing apparatus 1 of the welded pipe 6 does not include any machine or device after the coiler 19. However, the manufacturing apparatus 1 of the welded pipe 6 is not limited thereto. The manufacturing apparatus 1 of the welded pipe 6 may include an annealing device after the coiler 19 in order to suppress the welded pipe 6 produced from being broken during bending or expansion.

[0139] In the first to third embodiments, the manufacturing device 1 of the welded pipe 6 is described by taking the case where the welded pipe 6 to be manufactured is a heat transfer pipe for a heat exchanger as an example. However, the welded pipe 6 to be manufactured is not limited to this. The forming devices 15A and 15B, the manufacturing device 1 of the welded pipe 6, the forming method of the pipe 3, and the manufacturing method of the welded pipe 6 of the embodiment disclosed herein can be applied to all pipes manufactured by forming the strip metal plate 2 into a tubular metal plate without performing complicated positional adjustments between the components.

[0140] As described above, the forming devices 15A and 15B, the manufacturing device 1 of the welded pipe 6 , the forming method of the pipe 3 , and the manufacturing method of the welded pipe 6 are not limited to the above-mentioned Embodiments 1 to 3, and various modifications and substitutions can be made.

[0141] (Note 1)

[0142] A molding device, comprising:

[0143] a tube forming section having a through hole whose diameter decreases from an inlet toward an outlet, wherein a strip metal plate bent in a width direction is fed from the inlet of the through hole so that a first end face and a second end face in the width direction of the strip metal plate approach each other from the inlet toward the outlet, thereby forming the strip metal plate into a tube-shaped metal plate in which the first end face and the second end face face each other; and

[0144] An end face molding portion comprises a protrusion, wherein the protrusion has a first side wall and a second side wall protruding from the inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet toward the outlet, and the width of the protrusion from the first side wall to the second side wall decreases as it moves from the inlet toward the outlet, and the strip metal plate is fed from the inlet with the protrusion inserted between the first end face and the second end face of the strip metal plate, thereby the first side wall and the second side wall abut against the first end face and the second end face, the first end face and the second end face are molded into the shape of the first side wall and the second side wall, and the first end face is opposite to the second end face.

[0145] (Note 2)

[0146] The molding device according to Supplement 1, wherein:

[0147] The protrusion is formed of a material having higher compression strength and wear resistance than the strip-shaped metal plate.

[0148] (Note 3)

[0149] The molding device according to Supplement 1 or 2, wherein:

[0150] A protrusion length of the protrusion from the inner wall of the through hole becomes shorter from the inlet toward the outlet.

[0151] (Note 4)

[0152] The molding device according to any one of Supplementary Notes 1 to 3, wherein:

[0153] The extended portion of the wall surface of the first side wall intersects with the extended portion of the wall surface of the second side wall to form an inner angle,

[0154] The inner angle decreases from the inlet toward the outlet.

[0155] (Note 5)

[0156] The molding device according to any one of Supplementary Notes 1 to 4, wherein:

[0157] The first side wall and the second side wall are perpendicular to the inner wall surface of the through hole.

[0158] (Note 6)

[0159] The molding device according to any one of Supplementary Notes 1 to 5, wherein:

[0160] The tube forming portion further has a groove extending in a direction from the inlet toward the outlet on the inner wall of the through hole.

[0161] The end surface molding portion further includes a support portion that supports the protrusion and fits into the groove.

[0162] (Note 7)

[0163] The molding device according to any one of Supplementary Notes 1 to 6, wherein:

[0164] The tube forming portion is formed of a material softer than the strip metal plate,

[0165] At least a surface portion of the protrusion is formed of a material harder than the strip-shaped metal plate.

[0166] (Note 8)

[0167] The molding device according to any one of Supplementary Notes 1 to 7, wherein:

[0168] The forming device further includes a belt conveyor that pulls out the tubular metal plate formed into a tubular shape by the tube forming unit from the outlet and feeds the belt-shaped metal plate bent in a width direction into the inlet.

[0169] (Note 9)

[0170] A manufacturing device for a welded pipe comprises a forming device and a welding device.

[0171] The molding device comprises:

[0172] a roller device for bending a metal plate which is in a strip shape and is flat in the width direction of the strip in the width direction to shape the metal plate in the strip shape;

[0173] a tube forming section having a through hole whose diameter decreases from an inlet toward an outlet, wherein the strip metal plate bent in the width direction is fed from the inlet of the through hole so that a first end face and a second end face in the width direction of the strip metal plate approach each other from the inlet toward the outlet, thereby forming the strip metal plate into a tube-shaped metal plate in which the first end face and the second end face face each other; and

[0174] The end surface molding portion includes a protrusion, the protrusion having a first side wall and a second side wall protruding from the inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet toward the outlet, and a width of the protrusion from the first side wall to the second side wall becoming smaller as it moves from the inlet toward the outlet, the strip metal plate is fed from the inlet in a state where the protrusion is inserted between the first end surface and the second end surface of the strip metal plate, whereby the first side wall and the second side wall abut against the first end surface and the second end surface, the first end surface and the second end surface are molded into the shapes of the first side wall and the second side wall, and the first end surface and the second end surface are made to face each other,

[0175] The welding device welds the first end surface and the second end surface of the tubular metal plate.

[0176] (Note 10)

[0177] The manufacturing apparatus of the welded pipe according to Supplementary Note 9, wherein:

[0178] The welding device is an electron beam welding device that allows an electron beam to bombard the first end surface and the second end surface of the tubular metal plate to weld the first end surface and the second end surface.

[0179] (Note 11)

[0180] A tube forming method is a method for manufacturing a tube using a forming device, the forming device comprising:

[0181] a tube-shaped portion having a through hole whose diameter decreases from the inlet toward the outlet; and

[0182] an end surface molding portion having a protrusion, the protrusion having a first side wall and a second side wall protruding from an inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet toward the outlet, and a width of the protrusion from the first side wall to the second side wall becoming smaller as it moves from the inlet toward the outlet,

[0183] The tube forming method includes the following steps: feeding a strip metal plate bent in a width direction from the inlet of the tube forming unit, so that a first end face and a second end face in the width direction of the strip metal plate approach each other as moving from the inlet toward the outlet, and forming the strip metal plate into a tubular metal plate in which the first end face and the second end face face face each other;

[0184] In the process of forming the strip metal plate into the tubular metal plate, the strip metal plate is fed from the inlet with the protrusion of the end face forming portion inserted between the first end face and the second end face of the strip metal plate, whereby the first side wall and the second side wall abut against the first end face and the second end face, the first end face and the second end face are formed into the shape of the first side wall and the second side wall, and the first end face is opposite to the second end face.

[0185] (Note 12)

[0186] A method for manufacturing a welded pipe, comprising:

[0187] A method for forming a tube as described in Supplementary Note 11; and

[0188] A step of welding the first end face and the second end face, which are opposed to each other, of the tubular metal plate formed into a tubular shape by the tube forming method.

[0189] The present disclosure is capable of various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. In addition, the above-mentioned embodiments are used to illustrate the present disclosure and do not limit the scope of the present disclosure. That is, the scope of the present disclosure is not shown by the embodiments, but by the claims. Moreover, various modifications implemented within the scope of the claims and the equivalent disclosures are considered to be within the scope of the present disclosure.

[0190] This application is based on Japanese Patent Application No. 2022-131937 filed on August 22, 2022. The entire specification, claims, and drawings of Japanese Patent Application No. 2022-131937 are incorporated herein by reference.

[0191] Description of symbols

[0192] 1: welding tube manufacturing device; 2: strip metal plate; 3: tube; 4, 5: waist; 6: welding tube; 10: unwinding machine; 11: connecting machine; 12: storage tank; 13, 14: marking machine; 15A, 15B: forming device; 16A, 16C: welding machine; 17: drawing machine; 18: cutting machine; 19: winding machine; 20, 21: edge roller; 22: recess; 23: gap; 25, 26: end face; 30, 31: side roller; 32, 33: recess; 34: gap; 40: tube forming part; 41: main body; 42: guide; 43: through hole; 50: conveying device; 51, 52: endless belt; 60: electron beam welding device; 61: vacuum chamber; 62: connecting hole; 70: vacuum chamber; 71: inlet; 72: outlet; 73: Communication hole; 75, 76: vacuum chamber; 111: bracket; 131-133: tension adjustment roller; 150: forming device; 151-156: blanking roller; 157-160: finishing roller; 161, 163, 165: convex part; 162, 164, 166: concave part; 167, 169: fin part; 181: cutter; 191: winding part; 421: support Part; 422: protrusion; 423, 424: side wall; 431, 432: opening; 433: groove; 511: driving shaft; 512: driven shaft; 521: driving shaft; 522: driven shaft; A1~A6: arrows; D1, D2: column shaft; D3, D4: disk shaft; L1: protrusion length; W1: width; W2: maximum width; W3: width; W4: opening width.

Claims

1. A molding device, comprising: a tube forming section having a through hole whose diameter decreases from an inlet toward an outlet, wherein a strip metal plate bent in a width direction is fed from the inlet of the through hole so that a first end face and a second end face in the width direction of the strip metal plate approach each other from the inlet toward the outlet, thereby forming the strip metal plate into a tube-shaped metal plate in which the first end face and the second end face face each other; and An end face molding portion comprises a protrusion, wherein the protrusion has a first side wall and a second side wall protruding from the inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet toward the outlet, and the width of the protrusion from the first side wall to the second side wall decreases as it moves from the inlet toward the outlet, and the strip metal plate is fed from the inlet with the protrusion inserted between the first end face and the second end face of the strip metal plate, thereby the first side wall and the second side wall abut against the first end face and the second end face, the first end face and the second end face are molded into the shape of the first side wall and the second side wall, and the first end face is opposite to the second end face.

2. The molding device according to claim 1, wherein: The protrusion is formed of a material having higher compression strength and wear resistance than the strip-shaped metal plate.

3. The molding device according to claim 1 or 2, wherein: A protrusion length of the protrusion from the inner wall of the through hole becomes shorter from the inlet toward the outlet.

4. The molding device according to any one of claims 1 to 3, wherein: The extended portion of the wall surface of the first side wall intersects with the extended portion of the wall surface of the second side wall to form an inner angle, The inner angle decreases from the inlet toward the outlet.

5. The molding device according to any one of claims 1 to 4, wherein: The first side wall and the second side wall are perpendicular to the inner wall surface of the through hole.

6. The molding device according to any one of claims 1 to 5, wherein: The tube forming portion further has a groove extending in a direction from the inlet toward the outlet on the inner wall of the through hole. The end surface molding portion further includes a support portion that supports the protrusion and fits into the groove.

7. The molding device according to any one of claims 1 to 6, wherein: The tube forming portion is formed of a material softer than the strip metal plate, At least a surface portion of the protrusion is formed of a material harder than the strip-shaped metal plate.

8. The molding device according to any one of claims 1 to 7, wherein: The forming device further includes a belt conveyor that pulls out the tubular metal plate formed into a tubular shape by the tube forming unit from the outlet and feeds the belt-shaped metal plate bent in a width direction into the inlet.

9. A manufacturing device for a welded pipe, comprising a forming device and a welding device, The molding device comprises: a roller device for bending a metal plate which is in a strip shape and is flat in the width direction of the strip in the width direction to shape the metal plate in the strip shape; a tube forming section having a through hole whose diameter decreases from an inlet toward an outlet, wherein the strip metal plate bent in the width direction is fed from the inlet of the through hole so that a first end face and a second end face in the width direction of the strip metal plate approach each other from the inlet toward the outlet, thereby forming the strip metal plate into a tube-shaped metal plate in which the first end face and the second end face face each other; and The end surface molding portion includes a protrusion, the protrusion having a first side wall and a second side wall protruding from the inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet toward the outlet, and a width of the protrusion from the first side wall to the second side wall becoming smaller as it moves from the inlet toward the outlet, the strip metal plate is fed from the inlet in a state where the protrusion is inserted between the first end surface and the second end surface of the strip metal plate, whereby the first side wall and the second side wall abut against the first end surface and the second end surface, the first end surface and the second end surface are molded into the shapes of the first side wall and the second side wall, and the first end surface and the second end surface are made to face each other, The welding device welds the first end surface and the second end surface of the tubular metal plate.

10. The manufacturing apparatus for a welded pipe according to claim 9, wherein: The welding device is an electron beam welding device that allows an electron beam to bombard the first end surface and the second end surface of the tubular metal plate to weld the first end surface and the second end surface.

11. A method for forming a tube, which is a method for forming a tube using a forming device, the forming device comprising: a tube-shaped portion having a through hole whose diameter decreases from the inlet toward the outlet; and an end surface molding portion having a protrusion, the protrusion having a first side wall and a second side wall protruding from an inner wall of the through hole, the first side wall and the second side wall extending in a direction from the inlet toward the outlet, and a width of the protrusion from the first side wall to the second side wall becoming smaller as it moves from the inlet toward the outlet, The tube forming method includes the following steps: feeding a strip metal plate bent in a width direction from the inlet of the tube forming unit, so that a first end face and a second end face in the width direction of the strip metal plate approach each other as moving from the inlet toward the outlet, and forming the strip metal plate into a tubular metal plate in which the first end face and the second end face face face each other; In the process of forming the strip metal plate into the tubular metal plate, the strip metal plate is fed from the inlet with the protrusion of the end face forming portion inserted between the first end face and the second end face of the strip metal plate, whereby the first side wall and the second side wall abut against the first end face and the second end face, the first end face and the second end face are formed into the shape of the first side wall and the second side wall, and the first end face is opposite to the second end face.

12. A method for manufacturing a welded pipe, comprising: The method for forming a tube according to claim 11; as well as A step of welding the first end face and the second end face, which are opposed to each other, of the tubular metal plate formed into a tubular shape by the tube forming method.

Images