JP5323868B2 - Bent pipe manufacturing apparatus and bent pipe manufacturing method - Google Patents

Description

The present invention relates to a bent pipe manufacturing apparatus and a bent pipe manufacturing method for manufacturing bent pipes such as air-conditioning ducts, exhaust pipes, and drain pipes whose axes are bent (curved).

  In a method of manufacturing a bent pipe by winding a strip-shaped metal plate in a spiral shape and connecting adjacent edges of the metal plate to each other, a technique for improving material yield or generating no scrap is known ( For example, see Patent Document 1.) In this technique, two strip-shaped metal plates having a straight line on one edge and a corrugated curve on the other edge are taken from one metal strip-shaped plate material. Then, the belt-shaped metal plate is spirally wound, and a large portion of the belt-shaped metal plate is positioned on the outer circumferential curve and a narrow portion of the belt-shaped metal plate is positioned on the inner curve, and the adjacent edges are connected to each other. Thereby, the curved pipe bent in the circular arc shape is manufactured.

Japanese Patent Publication No. 06-046078

  By the way, curved pipes have various sizes and diameters depending on the purpose of use and usage environment. However, in the manufacturing method as described above, the curved pipes must be manufactured with a manufacturing apparatus corresponding to each diameter. Don't be. In other words, a single manufacturing device can only produce curved tubes with one specific diameter and radius of curvature, and many manufacturing devices are required to produce curved tubes of various sizes and diameters. And equipment costs are high.

Therefore, an object of the present invention is to provide a bent pipe manufacturing apparatus and a bent pipe manufacturing method capable of manufacturing a bent pipe having a plurality of sizes and diameters.

In order to achieve the above object, the invention according to claim 1 is a bent pipe manufacturing apparatus for manufacturing a bent pipe having a bent portion with a bent axis, and a long strip-shaped workpiece is provided with a predetermined trajectory in the longitudinal direction. Cutting means for forming two strips having a wavy curve and the other side edge being straight, and a first goby forming means for forming a first goby on the cut edge of the strip And a second goby that engages with the first goby is formed on the other side edge of the strip and is adjustable in the width direction of the strip so as to match the width of the workpiece. The second goby forming means and the band material on which the first goby and the second goby are formed are such that the peak portion of the wavy curve is located on the outer arc side and the trough portion is located on the inner arc side. Winding hand that forms the bent portion by engaging the first goby and the second goby adjacent to each other in a spiral manner Characterized in that it comprises a and.

  According to this invention, the workpiece is cut by the cutting means to form two strips, the first goby forming means forms the first goby at the cutting edge of the strip, and the second A second goby is formed on the other side edge of the band material by the goby forming means. Then, the first goby and the second gobe are engaged with each other while the strip is wound spirally by the winding forming means, and a bent portion is formed.

  According to a second aspect of the present invention, in the bent tube manufacturing apparatus according to the first aspect, the winding forming means is detachably provided with an annular forming jig having a different inner diameter, and the inner surface of the forming jig is It is characterized by winding a strip.

According to a third aspect of the present invention, in the bent pipe manufacturing apparatus according to the first or second aspect, the first goby forming means, the second gouge forming means, and the winding forming means are provided on the two strips. It is characterized by being provided for each. A fourth aspect of the present invention is a curved pipe manufacturing method using the curved pipe manufacturing apparatus according to any one of the first to third aspects, wherein a long strip-shaped workpiece is formed in the longitudinal direction by the cutting means. Cutting at a predetermined trajectory, forming two strips having a wavy curve at the cutting edge and a straight line at the other side edge; and a first cutting edge of the strip by the first gob forming means. The second goby forming means, the second goby forming on the other side edge of the band material by the second goby forming means, and the forming means, The strips formed with the first goby and the second goby are spirally wound so that the peak of the wavy curve is located on the outer arc side and the valley is located on the inner arc side, and adjacent to each other Engaging the first goby and the second goby And butterflies.

According to the first and fourth aspects of the present invention, the band material on which the goby is formed by the cutting means, the first goby forming means, and the second goby forming means is spirally wound by the winding forming means. Thus, a bent pipe having a bent portion is manufactured. That is, a curved pipe is automatically manufactured from a long strip-shaped workpiece. Moreover, since the second goby forming means can be adjusted in the width direction of the strip so as to match the width dimension of the workpiece, the width of the workpiece is increased according to the size and diameter of the curved pipe to be manufactured. even when changing of, by adjusting the second goby forming means in accordance with the size of the width of the workpiece, that strip can be produced bends of the plurality of size-diameter. That is, one main manufacturing apparatus can manufacture a plurality of bent pipes having a plurality of sizes and diameters, and the equipment cost can be significantly reduced.

  According to the invention described in claim 2, since the strip is spirally wound along the inner surface of the forming jig, deformation of the strip due to the spring back is suppressed, and the strip is spiraled more easily and with higher accuracy. Can be wound on. Moreover, since the forming jigs having different inner diameters are detachable, it is possible to manufacture bent pipes having a plurality of sizes and diameters by mounting the forming jigs having inner diameters corresponding to the sizes and diameters of the bent pipes to be manufactured. .

  According to invention of Claim 3, since the 1st goby formation means, the 2nd goze formation means, and the winding forming means are provided with respect to 2 bands, respectively, 2 bands are used. By processing at the same time, two curved pipes can be manufactured simultaneously. As a result, productivity is improved and, as described above, a plurality of bent pipes having a plurality of sizes and diameters can be manufactured, so that the operating rate and production efficiency are remarkably high.

It is a part of top view which shows the curved pipe manufacturing apparatus which concerns on embodiment of this invention. FIG. 2 is a plan view continued from FIG. 1. It is a part of front view which shows the curved pipe manufacturing apparatus which concerns on embodiment of this invention. FIG. 4 is a continuation front view of FIG. 3. It is a front view which shows the round elbow duct which concerns on embodiment of this invention. It is sectional drawing which shows the engagement state of the double hull and the single hull which concerns on embodiment of this invention. It is a top view which shows the cutting material which concerns on embodiment of this invention. It is a top view which shows the cutting locus of the coil material which concerns on embodiment of this invention.

  The present invention will be described below based on the illustrated embodiments.

  1 to 4 are a plan view and a front view showing a curved pipe manufacturing apparatus 100 according to an embodiment of the present invention, and an overall plan view is obtained by combining the arrow A in FIG. 1 and the arrow A in FIG. The entire front view is configured by combining the arrow B in FIG. 3 and the arrow B in FIG. 4. The bent pipe manufacturing apparatus 100 is an apparatus for manufacturing a bent pipe having a bent portion with a bent axis, and mainly includes a cut forming stage 101 and a winding forming stage (winding forming means) 102. Here, in this embodiment, the case where the curved pipe to be manufactured is a round elbow duct 1 as shown in FIG. 5 will be described. The round elbow duct 1 is an air-conditioning duct having a cylindrical cross section, a bent portion 11 whose axis (center line) is bent 90 degrees in an arc shape, and a joint portion provided at both ends of the bent portion 11 and having a straight axis. 12 and 13.

  The cut forming stage 101 is installed on the downstream side of the uncoiler 103 on which a long strip-shaped workpiece (coil material) M is installed, and an outer edge roller unit (second goby forming means) 104 and a cutter unit (cutting means) 105. And an inner edge roller unit (first goby forming means) 106. The uncoiler 103 is a device that unwinds the coil material M wound in a coil shape, and the outer edge roller unit 104 has a double haze (second seam) 2a on both side edges of the coil material M unwound from the uncoiler 103. Is formed.

  Specifically, a plurality of outer edge rollers 141 are disposed along the longitudinal direction of the coil material M, and the side edges of the coil material M are sequentially bent by the outer edge rollers 141, so that a double hump as shown in FIG. 2a is formed. Here, the double hull 2a shown in FIG. 6 and the single hull 2b, which will be described later, indicate a state where the double haze 2a and the single hull 2b are engaged and joined, and the outer edge roller unit 104 and the inner edge roller unit 106. The shape formed by is different. That is, the roller units 104 and 106 are formed into shapes that can be engaged as shown in FIG.

  Further, the outer edge roller unit 104 is movable in the width direction of the coil material M, that is, in the width direction of the cut material (band material) 2 described later. That is, the roller frame on which the outer edge rollers 141 are disposed is disposed so as to be movable and adjustable in the width direction of the coil material M, and is driven by the first moving motor unit 142. Further, such movement / adjustment of the outer edge roller unit 104 is controlled by the first control panel 111, and a parameter such as a width dimension of the coil material M or a pipe diameter of the round elbow duct 1 to be manufactured is input. , Controlled to match the input parameters. Thus, according to the round elbow duct 1 to be manufactured, the width dimension and thickness of the coil material M to be used are set in advance, and the predetermined round elbow duct 1 can be manufactured by changing the width dimension of the coil material M and the like. It looks like

  The cutter unit 105 cuts the coil material M along a predetermined trajectory in the longitudinal direction to form two strips having a wavy curve at the cutting edge and a straight line at the other side edge. It is arranged on the downstream side. That is, the cutter that makes point contact with the coil material M is disposed so as to be movable in the width direction of the coil material M, and the coil material M is moved while moving in the width direction with respect to the coil material M sent from the uncoiler 103. By cutting, the cut material 2 having a predetermined shape is formed. Such movement of the cutter is program-controlled by the first control panel 111, and by inputting parameters such as the pipe diameter of the round elbow duct 1 to be manufactured or the width dimension of the coil material M, the input parameters are set. Controlled to fit.

  The predetermined trajectory is preset based on the pipe diameter of the round elbow duct 1 to be manufactured, the radius of curvature of the bent portion 11, the width dimension of the coil material M, and the like, and the trajectory in which the round elbow duct 1 to be manufactured can be manufactured. It has become. Specifically, in this embodiment, as shown in FIGS. 7 and 8, the cutting material 2 including the curve forming portion 21 and the straight line forming portions 22 and 23 is formed. Here, the curve forming portion 21 is a waveform curve in which one side edge in the longitudinal direction is a straight line, and the other side edge is alternately continuous with a peak portion 21a and a valley portion 21b. The pitch (distance between the peak portion 21a and the peak portion 21a) P and the position of the waveform curve are based on the cylinder diameter / tube diameter of the round elbow duct 1, and the peak portion 21a is always located on the outer arc side of the bent portion 11, It is set so that the valley portion 21b is always located on the inner arc side of the bent portion 11. The length L1 of the curve forming portion 21 is set so that the bent portion 11 is formed by the curve forming portion 21 based on the cylinder diameter of the round elbow duct 1.

  From both ends of the curve forming portion 21, straight line forming portions 22 and 23 having both straight edges on the longitudinal direction are formed. The lengths L2 and L3 of the straight line forming portions 22 and 23 are based on the cylindrical diameter of the round elbow duct 1 so that the first joint forming portion 12 is formed by the first straight line forming portion 22 and the second straight line forming portion 23 Two joint portions 13 are set to be formed. Here, a two-dot chain line T in FIG. 8 is a cutting locus by the cutter unit 105.

  The inner edge roller unit 106 forms a single seam (first seam) 2 b at the cutting edge of the cutting material 2, and is disposed on the downstream side of the cutter unit 105. Specifically, a plurality of inner edge rollers 161 are arranged along the longitudinal direction of the coil material M, and the cutting edges (inner edges) of the cut material 2 are sequentially bent by the inner edge rollers 161, as shown in FIG. The single forms a shell 2b. Similarly to the outer edge roller unit 104, the second moving motor unit 162 can be moved in the width direction of the coil material M / cut material 2, and the first control panel 111 has parameters such as the width dimension of the coil material M. By inputting, movement control is performed so as to conform to the input parameters. As described above, in this embodiment, the inner edge roller unit 106 is also movable, but the position of the inner edge roller unit 106 is fixed by forming a single shell 2b immediately after cutting by the cutter unit 105. May be.

  In this way, the outer edge roller unit 104 forms a double hull 2a on the straight edge (the other side edge) of the cut material 2, and the inner edge roller unit 106 forms a hull 2b on the cut edge of the cut material 2. . Here, the double seam 2a is first formed in the state of the coil material M. As a result, the double seam 2a is formed on the straight edge of the cutting material 2, and such a process is also included in the present invention. . On the other hand, after cutting the coil material M into the cut material 2, a double hull 2 a may be formed on the straight edge of the cut material 2.

  Further, the outer edge roller unit 104 and the inner edge roller unit 106 are respectively provided for the two cutting materials 2. That is, the outer edge roller unit 104 is disposed on each side edge of the coil material M, and the inner edge roller unit 106 is disposed on the inner edge (cut edge) of each cutting material 2.

  The cut material 2 in which the double seam 2a and the single seam 2b are formed is sent to the winding forming stage 102 via the guide feeder 107, respectively. Here, the guide feeder 107 has a function of guiding and guiding the cutting material 2 to the winding forming stage 102 and adjusting the double shell 2a and the single shell 2b. That is, in the cut forming stage 101 or after the cut forming stage 101, the shells 2a and 2b may be distorted or bent, and the deformed shells 2a and 2b are passed through a guide jig having a predetermined shape. Therefore, it is arranged in a regular shape.

  Further, as shown in FIG. 2, the guide feeder 107 is rotatable (swinged) in the horizontal direction in accordance with the width of the coil material M / cut material 2, the feed angle, and the like. The space between the guide feeder 107 and the cut forming stage 101 is a stage / space for adjusting the tension applied to the cutting material 2. That is, the cutting speed may be different between the cut forming stage 101 and the winding forming stage 102. In this case, in order to prevent an excessive tension from being applied to the cutting material 2, the cutting material 2 is loosened at this stage. In this state, it is sent to the winding forming stage 102.

  The winding forming stage 102 is a stage for forming the round elbow duct 1 by spirally winding the cut material 2 from the cut forming stage 101, and can form the round elbow duct 1 having a plurality of tube diameters and curvature radii. . Specifically, as shown in FIG. 4, an annular forming jig 121 having different inner diameters is detachably provided, and the cutting material 2 is fed into the forming jig 121 by a feeder. Thereby, along the inner surface of the forming jig 121, the crest 21a of the curve forming portion 21 is located on the outer arc side, the trough portion 21b is located on the inner arc side, and the adjacent double double 2a and single are The cut material 2 is wound spirally while overlapping with the flange 2b. Then, the portion where the double base 2a and the single base 2b overlap is pressed with a jig to engage and join.

  By continuously performing such winding and engagement with respect to the first straight line forming part 22, the curve forming part 21 and the second straight line forming part 23, the bent part 11 and the joint parts 12 and 13 are connected. A round elbow duct 1 is formed. That is, the first joint part 12 is formed by the first straight line forming part 22, the bent part 11 is formed by the curved line forming part 21, and the second joint part 13 is formed by the second straight line forming part 23. In addition, a plurality of pressing arms 122 are arranged radially around the forming jig 121, and the formed round elbow duct 1 is pressed and held by the pressing arm 122 while being shaped and held. And after the round elbow duct 1 is shape | molded, the cutting material 2 is cut | disconnected and the round elbow duct 1 is cut off.

  Here, the inner diameter of the forming jig 121 is set to be the same as the tube diameter / outer diameter of the round elbow duct 1 to be manufactured, and in this embodiment, the tube diameter (diameter) of the round elbow duct 1 and the bent portion. The shape of the cut material 2 is set so that the radius of curvature of 11 has the same dimension. That is, when the round elbow duct 1 having a specific pipe diameter and curvature radius is manufactured, the forming jig 121 having a predetermined inner diameter corresponding to the round elbow duct 1 is attached. Furthermore, each pressing arm 122 is detachably disposed on the arm support 123, and can be adapted to the round elbow duct 1 having a different tube diameter and curvature radius by changing the disposition position.

  Such a winding forming stage 102 is provided for each of the two cut materials 2. Further, the feed speed of the cutting material 2 to the forming jig 121 by the feeder, the cutting timing of the cutting material 2, and the like are controlled by the second control panel 124. That is, when the type of the round elbow duct 1 to be manufactured is input to the second control panel 124, the feed rate, the cutting timing, and the like are automatically controlled so as to match the input type.

  Next, the operation of the bent pipe manufacturing apparatus 100 having such a configuration will be described.

  First, the coil material M suitable for the tube diameter and the radius of curvature of the round elbow duct 1 to be manufactured is set on the uncoiler 103, and a forming jig 121 having a predetermined inner diameter is mounted on the winding forming stage 102. Next, the width dimension of the coil material M is input to the first control panel 111, the outer edge roller unit 104 and the inner edge roller unit 106 are moved to predetermined positions, and a cutting locus by the cutter unit 105 is set. . Further, the type of the round elbow duct 1 is input to the second control panel 124 to adjust the feed speed, cutting timing, etc. in the winding forming stage 102.

  Next, when the bent pipe manufacturing apparatus 100 is operated, the coil M unwound from the uncoiler 103 is sent to the cut forming stage 101, and the double edge 2a is formed on both side edges of the coil material M by the outer edge roller unit 104. The Subsequently, the coil material M is cut into a predetermined shape by the cutter unit 105 to form the two cut materials 2 as described above, and the single inner portion of each cut material 2 is cut by the inner edge roller unit 106. A screw 2b is formed.

  Next, each cut material 2 is sent to the winding forming stage 102 via the guide feeder 107, and is wound spirally and joined in the winding forming stage 102 as described above, so that a predetermined round elbow duct 1 is formed. Molded. By performing such a process continuously, the round elbow duct 1 is manufactured continuously.

  As described above, according to the bent pipe manufacturing apparatus 100, the round elbow duct 1 can be manufactured automatically and continuously from the coil material M. In addition, the outer edge roller unit 104 and the inner edge roller unit 106 are moved and adjusted, the cutting trajectory by the cutter unit 105 is set to a predetermined trajectory, and the feed speed and cutting timing in the winding molding stage 102 are adjusted to obtain a predetermined trajectory. A round elbow duct 1 having a plurality of pipe diameters and curvature radii can be formed by mounting the forming jig 121 having an inner diameter of. That is, one main manufacturing apparatus 100 can manufacture the round elbow duct 1 having a plurality of sizes and diameters, and the facility cost can be significantly reduced.

  Moreover, since the outer edge roller unit 104, the inner edge roller unit 106, and the winding forming stage 102 are provided for the two cut materials 2, respectively, the two cut materials 2 are processed at the same time, and the two round elbow ducts 1 are processed. Can be manufactured at the same time. As a result, productivity is improved and, as described above, the round elbow duct 1 having a plurality of sizes and diameters can be manufactured, so that the operating rate and the production efficiency are remarkably high. Moreover, since the cutting material 2 is spirally wound along the inner surface of the forming jig 121, deformation of the cutting material 2 due to the spring back is suppressed, and the cutting material 2 can be spirally wound with higher accuracy. .

  On the other hand, according to the round elbow duct 1 as described above, the round elbow duct 1 in which the bent portion 11 and the joint portions 12 and 13 are continuously formed by the integral cutting material 2 is manufactured. It is not necessary to manufacture and connect the joint portions 12 and 13 separately. For this reason, productivity is high, and since there is no connection part in the bending part 11 and the joint parts 12 and 13, an air leak, a fall of intensity | strength, etc. are not caused.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above-described embodiment, the round elbow duct 1 having the bent portion 11 whose axis is bent 90 degrees in an arc shape has been described, but the present invention can also be applied to a round elbow duct having a bent portion other than 90 degrees. . Moreover, it is applicable also to the round elbow duct which does not have the joint parts 12 and 13, and the round elbow duct which has only one joint part 12 and 13. FIG. Furthermore, although the first control panel 111 and the second control panel 124 are separate bodies, they may be provided integrally.

  The present invention is not limited to air conditioning ducts but can be applied to other curved pipes such as exhaust pipes and drain pipes.

1 Round elbow duct (curved pipe)
DESCRIPTION OF SYMBOLS 11 Bending part 12 1st joint part 13 2nd joint part 2 Cut material (strip material)
2a double haze (second goby)
2b single haze (first goby)
DESCRIPTION OF SYMBOLS 100 Curved pipe manufacturing apparatus 101 Cut formation stage 102 Winding forming stage (winding forming means)
103 Uncoiler 104 Outer edge roller unit (second goby forming means)
105 Cutter unit (cutting means)
106 Inner edge roller unit (first goby forming means)
107 Guide feeder 121 Molding jig M Coil material (workpiece)

Claims (4)

A bent pipe manufacturing apparatus for manufacturing a bent pipe having a bent portion with a bent axis,
A cutting means for cutting a long strip-shaped workpiece in a longitudinal direction with a predetermined trajectory, and forming two strips in which the cutting edge is a wavy curve and the other side edge is a straight line;
First goby forming means for forming a first goby on the cut edge of the strip;
A second gob that engages with the first gob is formed on the other side edge of the band material and is adjustable in the width direction of the band material so as to match the width dimension of the workpiece . 2 goby formation means,
The strips formed with the first goby and the second goby are spirally wound so that the peak of the wavy curve is located on the outer arc side and the valley is located on the inner arc side, and adjacent to each other Winding forming means for engaging the first goby and the second goze to form the bent portion;
A curved pipe manufacturing apparatus comprising: The winding forming means is detachably equipped with an annular forming jig having different inner diameters, and winds the strip along the inner surface of the forming jig.
The bent pipe manufacturing apparatus according to claim 1. The first goby forming means, the second goby forming means, and the winding forming means are provided for the two strips, respectively.
The curved pipe manufacturing apparatus according to claim 1 or 2, wherein A curved pipe manufacturing method using the curved pipe manufacturing apparatus according to any one of claims 1 to 3,
  Cutting the long strip-like workpiece with a predetermined trajectory in the longitudinal direction by the cutting means to form two strips having a wavy curve at the cutting edge and a straight line at the other side edge;
  Forming a first goby on the cut edge of the strip by the first goby forming means;
  Forming a second goby engaging with the first goby on the other side edge of the strip by the second goby forming means;
  The strip formed with the first goby and the second goby by the forming means is spirally shaped so that the peak of the wavy curve is located on the outer arc side and the valley is located on the inner arc side. Engaging the first goby and the second goby adjacent to each other;
A curved pipe manufacturing method comprising:

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