JP2018144125A - Steel roof material manufacturing method and steel roof material manufacturing apparatus suitable for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel roof material manufacturing method capable of reducing waste of steel, and a steel roof material manufacturing apparatus suitable for the same.SOLUTION: A steel roof material manufacturing method includes: a diagonal cutting step P1 of cutting a segment crossing both short sides of a rectangular planar steep plate 1 with respect to the rectangular planar steep plate 1 having predetermined length and width and inclined with respect to a long side; and a separation step P2 of forming a bifurcation part made of two strip-like steel plates in the planar steep plate 1, by separating opposed cut surfaces formed in the planar steep plate 1 by the diagonal cutting step P1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a steel roofing material manufacturing method and a steel roofing material manufacturing apparatus suitable for the method.

  Metal roofs are used in various buildings because they are lightweight, durable and can be processed into complex shapes. In particular, it is applied to large and complex buildings such as stadiums, ball games, museums, art galleries, airport buildings, and dome. In particular, the construction method in which both ends of the long side of the roofing material cut out in a rectangular shape from the coil of the steel plate are seam welded over the entire length of the bent portion of the roofing material and the adjacent roofing material has excellent water-stopping and corrosion resistance It is. In addition, a roof structure using folded plates is also well known.

  For example, Patent Document 1 describes that a dome roof of a large building is configured with a trapezoidal roof material having a taper in the longitudinal direction. Further, in FIG. 8 and paragraph [0017] of Patent Document 2, the left and right side edges of the rectangular forming material A are cut into a taper shape by the slit cutter 16 to form a trapezoidal roof material having a taper shape. Things are described.

Japanese Patent Laid-Open No. 11-2700088 Japanese Patent Laid-Open No. 7-236926

  However, cutting the left and right side edges of the long rectangular steel material into a taper shape as described in Patent Document 2 is wasteful to the steel material. Therefore, an object of the present invention, that is, a technical problem to be solved is to provide a steel roofing material manufacturing method capable of reducing the waste of steel material and a steel roofing material manufacturing apparatus suitable for the method.

  Accordingly, the method disclosed in claim 1 is applied to a rectangular flat steel plate having a predetermined length and width on a line segment that intersects both short sides of the rectangular flat steel plate and has an inclination with respect to the long side. And a separating step of separating two opposing cut surfaces generated in the flat steel plate by the oblique cutting step to form a bifurcated portion made of two strip steel plates. The above-described problems have been solved by using a steel roofing material manufacturing method characterized by having the steel roofing material.

  Further, the method disclosed in claim 2 is a method for manufacturing a steel roofing material according to claim 1, wherein at least one of the two strip-shaped steel plates forming the bifurcated portion is wound into a cylindrical shape. The said subject was solved by having set it as the steel roofing material manufacturing method characterized by having a recoil process. The method disclosed in claim 3 is the steel roofing material manufacturing method according to claim 1 or 2, wherein one of the intersections of the line segment having an inclination with respect to the long side and the two short sides is provided. The intersection point is referred to as the diagonal cutting start point, the other intersection point is referred to as the diagonal cutting end point, the distance between the diagonal cutting start point and the diagonal cutting end point is referred to as the diagonal cutting distance, When the distance of the direction component parallel to the side is referred to as a minimum separation gap, in the separation step, the opposed cut surfaces are separated from each other by a distance greater than the minimum separation gap. The above problem was solved by using a method.

  The method disclosed in claim 4 is the steel roofing material manufacturing method according to claim 3, wherein the direction of the long side is referred to as the longitudinal direction, and the direction of the short side on the planar steel plate is referred to as the width direction. When the numerical value obtained by dividing the distance of the direction component parallel to the width direction of the oblique cutting distance by the distance of the direction component parallel to the longitudinal direction of the oblique cutting distance is referred to as the movement proportional coefficient, the oblique cutting In the process, an initial position setting sub-process for positioning the cutter at the oblique cutting start point, and the cutter is moved in the longitudinal direction relative to the flat steel plate and moved to a distance moved in the longitudinal direction. And a moving cutting sub-step of cutting the flat steel sheet while moving the cutter in a width direction relative to the flat steel sheet in a direction crossing the flat steel sheet by a distance multiplied by a proportional coefficient. Feature By was steel roofing manufacturing method of, the above-mentioned problems are eliminated.

  The method disclosed in claim 5 is a steel roofing material manufacturing method according to any one of claims 1, 2, 3, or 4, wherein the line has an inclination with respect to the long side. The steel roofing material manufacturing method characterized in that it has a peeling step of peeling the coating film on at least one surface of the flat steel plate with respect to an area of a predetermined width around the minute. did.

The method disclosed in claim 6 is the steel roofing material manufacturing method according to claim 4, wherein the direction in which the cutter moves in the longitudinal direction relative to the flat steel plate is referred to as upstream, and the upstream When the opposite direction of the side is called the downstream side,
The initial position setting sub-step includes a step of disposing a polishing rotor provided with a peeling member on an outer periphery of a rotary rotor on an upstream side or a downstream side of the cutter. In the moving cutting sub-step, the polishing rotor and The cutter is moved in the longitudinal direction relative to the flat steel plate, and the polishing rotor and the cutter are moved to the flat steel plate by a distance obtained by multiplying each moving distance in the longitudinal direction by the movement proportional coefficient. On the other hand, the steel roofing material manufacturing method characterized in that coating film peeling and cutting are performed on the flat steel plate while moving in the width direction relatively. .

  The method disclosed in claim 7 is the steel roofing material manufacturing method according to any one of claims 1, 2, 3, 4, 5, or 6. It is one end of the lower base having a longer length with respect to at least one of the two trapezoidal steel plates including two perpendicular trapezoidal steel plates formed from the flat steel plate by completing the cutting step. When a right angle is referred to as a first base angle and a diagonal of the first angle is referred to as a second base angle, the first base angle is defined as an end that is the long side of the flat steel plate. A first trimming cutting line forming a first trimming angle which is a predetermined angle from the side to be cut on the trapezoidal steel plate surface with the first base angle as a base point, and parallel to the side generated by the cutting A second trimming cutting line with the second base angle as a base point is formed on the trapezoidal steel plate surface. By having a steel roofing manufacturing method characterized by having a trimming cutting step of only by cutting, the above-mentioned problems are eliminated.

  The method disclosed in claim 8 is the steel roofing material manufacturing method according to any one of claims 1, 2, 3, 4, 5, or 6. It is one end of the lower base having a longer length with respect to at least one of the two trapezoidal steel plates including two perpendicular trapezoidal steel plates formed from the flat steel plate by completing the cutting step. When a right angle is referred to as a first base angle and a diagonal of the first angle is referred to as a second base angle, a second trimming angle that is a predetermined angle is determined from the side generated in the oblique cutting process. A second trimming cutting line formed is provided on the trapezoidal steel plate surface with the second base angle as a base point and cut, and a first trimming cutting line parallel to a side generated by the cutting and having the first base point as a base point Trimming cutting step of cutting on the trapezoidal steel plate surface By having a steel roofing manufacturing method characterized by having solved the above problems.

  The configuration disclosed in claim 9 includes a conveyance unit that includes a pinch roller and conveys a long steel plate in the longitudinal direction, and a cutter that cuts the steel plate conveyed by the conveyance unit in the width direction across the conveyance unit. A cutting portion that is controlled to move, and a separating portion that separates opposing cut surfaces generated in the member to be cut by the cutting portion to form a bifurcated portion made of two strip steel plates on the member to be cut. And determining in advance a total distance for transporting the long steel sheet in the transport unit as a total transport distance, determining in advance a total movement amount of the cutter for movement control in a cutting unit as a total cutter movement amount, When the numerical value obtained by dividing the movement amount by the total conveyance distance is referred to as a cutting portion movement coefficient, while conveying the long steel sheet in the longitudinal direction, the distance to which the long steel sheet is conveyed by the conveyance Cutting part movement coefficient The long steel plate is cut while moving the cutter in the width direction by the multiplied distance, and the opposing cut surfaces generated in the flat steel plate by the cutting of the cutter by the cutting part are separated by the spacing part. The steel roofing material manufacturing apparatus is characterized in that it is spaced apart from the total cutter movement amount, thereby solving the above-mentioned problems.

  The structure disclosed in claim 10 is the steel roofing material manufacturing apparatus according to claim 9, wherein a recoil portion for winding at least one of the two strip-shaped steel plates constituting the bifurcated portion into a cylindrical shape is provided. By providing a steel roofing material manufacturing apparatus characterized in that it is provided at the rear stage of the spacing portion, the above-mentioned problems have been solved. The structure disclosed in claim 11 is the steel roofing material manufacturing apparatus according to claim 9 or claim 10, wherein the separating portion is disposed on a separating shaft that is passed across the conveying portion in the width direction. The separator is held so as to be freely movable in the width direction along the separation axis, the separator being in contact with one of the opposing cut surfaces generated on the flat steel plate, A first spacing surface that pushes the cutting surface away from the other cutting surface; and a second spacing surface that touches the other cutting surface and pushes the other cutting surface away from the one cutting surface. The steel roofing material manufacturing apparatus characterized by having a predetermined interval in the width direction has solved the above problems.

  Further, in the steel roofing material manufacturing apparatus according to any one of claims 9, 10, or 11, the coating composition of the flat steel plate is peeled by a predetermined width. The said subject was solved by setting it as the steel roof material manufacturing apparatus characterized by the coating film peeling part being provided in the front | former stage or the back | latter stage of the said cutting part.

  The manufacturing method disclosed in claim 1 has an effect of reducing the waste of the steel material. The manufacturing method disclosed in claim 2 has the effect of being easy to carry by being recoiled. The manufacturing method disclosed in claim 3 has an effect of easily separating the two recoiled trapezoidal steel plates. The manufacturing method disclosed in claim 4 has an effect of reducing the waste of the steel material.

  The manufacturing method disclosed in claims 5 and 6 has an effect that the coating film of the butt portion is peeled off and welding of the coated steel sheet can be easily performed. The manufacturing method disclosed in claims 7 and 8 has an effect that a trapezoidal steel plate necessary for the success of the circular roof can be manufactured without waste. The configuration disclosed in claim 9 has an effect of reducing the waste of the steel material.

  The structure according to the tenth aspect has an effect of being easy to carry by being recoiled. The configuration according to claim 11 has an effect of easily separating the two trapezoidal steel plates that have been cut. The structure disclosed in claim 12 has an effect that the coating film of the butt portion is peeled off and the painted steel sheet can be easily welded.

These are figures which show the steel roofing material manufacturing method which concerns on 1st Embodiment of this invention, Comprising: (A) is a figure of the process flow of the manufacturing method, (B) is the raw material processed into a steel roofing material. A plan view of a certain flat steel plate, (C1) is a diagram showing a flat steel plate partially subjected to an oblique cutting step and a separation step, and (C2) is an illustration of the flat steel plate in which the oblique cutting step, the separation step and the recoil process are being finished. (D1) is a perspective view of the separation part and recoil part of the steel roofing material manufacturing method, and (D2) is a front view of the separation part and recoil part. These are figures which show the example of an apparatus used with the steel roofing material manufacturing method which concerns on 1st Embodiment of this invention, Comprising: (A) is a figure of the separation part in a separation process, (B) was wound at the recoil process (C1) is an enlarged view of the separator provided in the separation part at (α) part of (A), (C2) is a longitudinal sectional view of (C1), and (D) is wound in the recoil process. (E) is a vertical cross-sectional view of a flat steel sheet wound in a recoil process through a separation process with a widening gap, and (F) is a coiled process in a recoil process without going through a separation process. (G) is a plan view of a flat steel plate before being obliquely cut, and (H) is a process flow diagram of the manufacturing method including an initial position setting sub-process. These are figures which show the steel roofing material manufacturing method which concerns on 2nd Embodiment of this invention, Comprising: (A) is a figure of the process flow of the manufacturing method, (B) is a partial coating film peeling process and a movement cutting sub. The figure which shows the flat steel plate with which the process and the separation process were implemented, (C) is the figure of the flat steel plate which the coating film peeling process and the movement cutting sub process, the separation process, and the recoil process are being completed, In the process flow which implements a coating-film peeling process after a sub process, it is a figure which shows the flat steel plate in which the coating-film peeling process, the movement cutting sub process, and the separation process were implemented. These are the figures of the steel roofing material manufacturing apparatus and flat steel plate which concern on 3rd Embodiment of this invention, Comprising: (A) is a top view of the flat steel plate before processing, (B) is a diagonal cutting process started. The figure which shows the state of the same steel roofing material manufacturing apparatus before, (C) is a figure which shows the state by which the diagonal cutting process, the separation | spacing process, and the recoil process were started, (D) is the Y1-Y1 arrow of (B) (E) is an end view taken along the line Y2-Y2 of (B). These are figures which show the process flow of the steel roofing material manufacturing method which concerns on 4th Embodiment of this invention, and the processed trapezoid steel plate, (A) is a figure which shows the process flow of the steel roofing material manufacturing method, (B) is a plan view of the trapezoidal steel plate after the oblique cutting step, (C) is a plan view of the trapezoidal steel plate after the trimming cutting step, and (D) is a diagram showing the trapezoidal steel plate after another trimming cutting step. These are figures which show the steel roofing material manufacturing method which concerns on 5th Embodiment of this invention, Comprising: (A) is the figure which fixed the edge part of the two strip | belt-shaped steel plates which comprise a bifurcated part to the recoil part to the recoil part. , (B) is a view further proceeding with the manufacturing method, (C1) is a perspective view of the separation portion and the recoil portion, (C2) is a front view of the separation portion and the recoil portion, and (D) is the bifurcated portion. It is the figure which winds one strip | belt-shaped steel plate of the two strip | belt-shaped steel plates to comprise at the recoil part at the cylinder shape.

[First Embodiment]
Based on FIG. 1, the steel roofing material manufacturing method which concerns on 1st Embodiment of this invention is demonstrated. The flat steel plate 1 is used as a raw material in the manufacturing method. FIG. 1B shows a plan view of the flat steel plate 1. The flat steel plate 1 is a rectangular flat steel plate. For example, a flat steel plate of 10 m × 0.5 m. For convenience of explanation, one of the short sides is referred to as side AB, and the other sides are hereinafter referred to as side BC, side CD, and DA, respectively, clockwise. Further, an angle formed by the side AB and the side BC is referred to as a corner B, and the other corners are hereinafter referred to as a corner C, a corner D, and a corner A in the clockwise direction.

  In the following description and drawings, the flat steel plate 1 is often represented. About this flat steel plate 1, for the sake of convenience of explanation or ensuring the visibility of the drawing, the aspect ratio is changed, the start position of the oblique cutting line to be described later is shifted, or the inclination of the oblique cutting line is changed. It may be changed and expressed. The direction of the side DA and the side BC, which are the long sides, is the longitudinal direction or the Y direction, and the direction from the corner A to the corner D is the positive direction. Furthermore, the direction orthogonal to the Y direction on the upper surface of the flat steel plate 1 is defined as the width direction or the X direction, and the direction from the corner A toward the corner B is defined as the positive direction.

<Process flow>
The manufacturing method is based on an oblique cutting process P1, a separation process P2, and a recoil process P3 [FIG. 1 (A)]. These steps are not performed individually one by one, but are performed simultaneously while feeding a long rectangular flat steel plate 1 in the longitudinal direction. At this time, the source of the flat steel plate 1 may be referred to as the upstream side, and the destination side may be referred to as the downstream side. For the flat steel plate 1 conveyed from the upstream to the downstream, for example, at the time T0, the oblique cutting process P1 is started. Next, the separation step P2 is started at time T1 from the location where the oblique cutting step P1 is started. The recoil process P3 is started at time T2 for the portion of the flat steel plate 1 that has been subjected to the oblique cutting process P1 and the separation process P2. Note that the recoil process P3 is not an essential process, but a process that is appropriately performed.

  FIG. 1 (C1) is a diagram showing the flat steel plate 1 partially subjected to the oblique cutting step P1 and the separation step P2. The oblique cutting process P <b> 1 is performed by the movable cutting unit 44. The cutter 441 of the movable cutting unit 44 moves in the positive direction in the X direction as the flat steel plate 1 is sent downstream. By this operation, the flat steel plate 1 is cut obliquely with respect to the long side.

  Subsequent to the oblique cutting step P1, a separating step P2 is performed in which the opposing cut surfaces generated in the flat steel plate 1 in the same step are separated from each other to form a bifurcated portion made of two strip steel plates on the flat steel plate. The separation step P <b> 2 is performed by a separation portion 45 provided on the downstream side of the movable cutting portion 44. In the separation portion 45, a plate-like separator 452 provided on a separation shaft 451 passed in the width direction enters between the cut surfaces, and separates the cut surfaces.

  The separator 452 is in contact with one of the opposing cut surfaces generated on the flat steel plate 1 and pushes the one cut surface in a direction away from the other cut surface, and the other separating surface 452a. A second spacing surface 452b that contacts the cut surface and pushes the other cut surface away from the one cut surface. An explanation with detailed figures will be given later.

  The separator 452 is held by a separation shaft 451 so as to be freely movable in the width direction. For this reason, even if the opposing cut surface which arose in the flat steel plate 1 arises in the diagonal direction by the diagonal cutting process P1, it can move to the width direction according to the position of this cut surface. A recoil portion 46 is provided further downstream of the separation portion 45.

  This is to take up the flat steel plate 1 that has been cut obliquely in the diagonal cutting step P1 and separated into two strip-like steel plates by separating the cut surfaces in the separating portion 45. The recoil portion 46 is a winder having an axis whose diameter is expanded and contracted by hydraulic pressure. When winding the strip-shaped steel plate, the diameter of the shaft center is kept at a large constant value. Then, at the beginning of winding, the separated end portion AB is fixed to the axial center surface of the recoil portion 46 with an adhesive tape 461.

  FIG. 1 (C2) is a view of the flat steel plate 1 in which the oblique cutting process, the separation process, and the recoil process are being completed. Most of the flat steel plate 1 shows a state where the oblique cutting process P1, the separation process P2, and the recoil process P3 have been performed. Most of the flat steel plate 1 is cut obliquely, the cut surfaces are separated from each other, and wound on the recoil portion 46. After the winding is completed, the diameter of the shaft center is reduced by hydraulic pressure, and the trapezoidal steel sheet wound in a cylindrical shape is removed from the recoil portion 46. The trapezoidal steel plate is a steel plate obtained by obliquely cutting the flat steel plate 1.

  When the flat steel plate 1 cut in this way, that is, the trapezoidal steel plate is wound into a cylindrical shape, it is convenient to transport the trapezoidal steel plate to the construction site of the roof by a truck. Further, according to the steel roofing material manufacturing method, since the two trapezoidal steel plates are separated from each other in the separation step P2, the two cylindrical trapezoidal steel plates wound up can be easily separated into two. . In general, the recoil process P3 is performed following the separation process P2.

  However, when the oblique cutting process P1 and the separation process P2 are performed at the construction site, the recoil process P3 may be omitted, and the two trapezoidal steel plates may be formed and constructed as a roofing material. Even in such a case, since the separation step P2 is performed, the two trapezoidal steel plates are appropriately separated from each other, which is convenient for the subsequent forming process. FIG. 1D1 is a perspective view of the separation portion 45 related to the separation step P2 and the recoil portion 46 related to the recoil step P3. Since the winder used for the recoil unit 46 is a well-known machine, it is omitted in the figure. Further, (D2) is a front view of the separation portion 45 and the recoil portion 46.

  The oblique cutting process P1, the separation process P2, and the recoil process P3 according to the first embodiment of the present invention have been described above. Here, the description has been made assuming that the source of the flat steel plate 1 is referred to as the upstream side and the destination side is referred to as the downstream side. In the cutting process P1, the separation process P2, and the recoil process P3, the movable cutting part 44, the separation part 45, and the recoil part 46 related to these processes move in the longitudinal direction relative to the flat steel plate 1. It only has to be. Based on this relative movement, the direction in which the movable cutting portion 44 moves in the longitudinal direction relative to the flat steel plate 1 is referred to as the upstream side, and the direction opposite to the upstream side is referred to as the downstream side. May be.

  FIG. 2A shows an example of the separation portion 45. The separation portion 45 has a configuration in which a separation shaft 451 that passes across the flat steel plate 1 is provided with a separator 452 that is held so as to be freely movable in the width direction along the separation shaft 451. [See also FIG. 1 (C1) and (C2)]. The separator 452 has a first separation surface 452a and a second separation surface 452b on both sides at a predetermined interval in the width direction.

  The first separation surface 452a and the second separation surface 452b act to push the opposing cut surfaces generated on the flat steel plate 1 in opposite directions and separate the cut surfaces by a predetermined width. When the flat steel plate 1 is placed on a transport unit that transports the flat steel plate 1 in the longitudinal direction, the separation shaft 451 is passed across the transport unit in the width direction.

  The separator 452 is held so as to be freely movable in the width direction along the separation shaft 451. For this reason, the separator 452 can move along the oblique cutting in the oblique cutting step P1 according to the pressure received by the first separating surface 452a and the second separating surface 452b from the cutting surface of the flat steel plate 1. An enlarged view (C1) and a longitudinal sectional view (C2) of the separator 452 are shown. A spacing gap having an appropriate width is provided between the first spacing surface 453a and the second spacing surface 453b.

  In the example shown here, a cylindrical separation cylinder 453c is sandwiched between a first separation surface 453a that is a disc and a second separation surface 453b that is a disc, and a constant interval is maintained. . The first separation surface 453a and the second separation surface 453b may or may not be fixed to the separation cylinder 453c, respectively. When not fixed, the separation width can be changed by appropriately selecting the separation cylinder.

  Further, the separator 452 may not rotate around the separation shaft 451. Even if it does not rotate, the required separation width can be ensured. However, the first separation surface 453a and the second separation surface 453b of the separator 452 may be rotatably held by the separation shaft 451. In this way, even if burrs are generated on the cut surface generated by the oblique cutting, it is possible to reduce friction between the cut surface and the first separation surface 453a and the second separation surface 453b.

  FIG. 2 (B) shows the separating portion 45 and the flat steel plate 1 wound around the recoil portion 46 after the above steps. The flat steel plate 1 is cut obliquely into two trapezoidal steel plates having two right angles. These two trapezoidal steel plates are wound with the cut surfaces separated by a predetermined distance by the first separation surface 452a and the second separation surface 452b during the separation step P2. Here, the trapezoidal steel plate separated in contact with the first separation surface 452a is referred to as a first trapezoidal steel plate 21, and the trapezoidal steel plate separated in contact with the second separation surface 452b is referred to as a second trapezoidal steel plate 22. .

  The direction of the separation shaft 451 of the separator 452, that is, the maximum thickness in the width direction is defined as the separation gap G. Then, as shown in FIG. 2 (B), the first trapezoidal steel plate 21 and the second trapezoidal steel plate 22 are separated from each other by a distance of the separation gap G in each wound layer. 2D is a longitudinal sectional view of the first trapezoidal steel plate 21 and the second trapezoidal steel plate 22 wound with the recoil portion 46 of FIG. As described above, the two steel plates wound up at a distance of the separation gap G1 having a certain width or more are easily separated into two coils by being removed from the winder constituting the recoil portion 46. be able to.

  FIG. 2 (E) is wound with a larger gap G2. On the other hand, FIG. 2 (F) is a vertical cross-sectional view in which the separation process P2 is omitted and the oblique cutting process P1 and the recoil process P3 are performed with the separation process P2 omitted. In this case, since the coil according to the first trapezoidal steel plate 21 surrounds the coil according to the second trapezoidal steel plate 22 from the outside, the two coils cannot be easily separated. This tendency becomes stronger as the inclination angle related to the oblique cutting process P1 increases. Therefore, it is better to increase the separation gap as the tilt angle increases.

  Here, the oblique cutting process P1, the separation process P2, and the recoil process P3 will be described in more detail with reference to FIG. FIG. 2G is a plan view of the flat steel plate 1 to be processed. Here, one intersection of two intersections of the line segment inclined with respect to the long side of the flat steel plate 1 and the two short sides is referred to as an oblique cutting start point 11, and the other intersection is referred to as an oblique cutting end point 12. I will do it.

  In the oblique cutting process P1, cutting of the flat steel plate 1 starts from the oblique cutting start point 11, and the cutting ends at the oblique cutting end point 12. A line segment connecting the oblique cutting start point 11 and the oblique cutting end point 12 is referred to as an oblique cutting line 13. The oblique cutting line 13 is shown for convenience of explanation, and is not always written on the surface of the flat steel plate 1.

  Further, the distance between the oblique cutting start point 11 and the oblique cutting end point 12 is referred to as an oblique cutting distance L, and the distance between the oblique cutting distance L and the direction component parallel to the width direction is referred to as a minimum separation gap G1. To do. In the separation process P2, when the cut plane steel plates 1 are wound in the recoil process P3 by separating the opposing cut surfaces apart from each other by the minimum separation gap G1, as shown in FIG. 2 (D) or (E), The first trapezoidal steel plate 21 and the second trapezoidal steel plate 22 are wound sufficiently apart.

  After being transported to the roof construction site in this state, it is used for construction. At this time, since the first trapezoidal steel plate 21 and the second trapezoidal steel plate 22 are wound sufficiently apart, when one is removed one by one, or when being pulled out from the core of the separating portion 46 while being wound The other does not interfere.

  Further, a numerical value obtained by dividing the distance of the directional component parallel to the width direction of the oblique cutting distance L by the distance of the directional component parallel to the longitudinal direction of the oblique cutting distance L is referred to as a movement proportional coefficient C. . The oblique cutting process P1 includes an initial position setting sub-process P11 for positioning the cutter 441 mounted on the movable cutting unit 44 at the oblique cutting start point 11 at the oblique cutting start point 11 [see FIG. 2 (H). ].

  Further, in the oblique cutting step P1, following the initial position setting sub-step P11, the cutter 441 is moved relative to the flat steel plate 1 in the longitudinal direction, and the movement proportional coefficient is set to the distance moved in the longitudinal direction. A moving cutting sub-process P12 for cutting the flat steel plate 1 while moving the cutter 441 in the width direction relative to the flat steel plate 1 in a direction crossing the flat steel plate 1 by a distance multiplied by C is included. As the moving cutting sub-process P12 proceeds, the cutter 441 reaches the oblique cutting end point 12, and finally the oblique cutting process P1 is completed. Thereby, the 1st trapezoidal steel plate 21 and the 2nd trapezoidal steel plate 22 are formed as two trapezoidal steel plates containing a right angle square.

[Second Embodiment]
Next, based on FIG. 3, the steel roofing material manufacturing method which concerns on 2nd Embodiment of this invention is demonstrated. The steel roofing material manufacturing method uses as a raw material a painted flat steel plate 1B having a color coating on its surface. It is necessary to peel off the coating film of the painted roof material prior to the welding at the part to be butt welded. This is for increasing electric conductivity in electric welding. Then, in the steel roofing material manufacturing method which concerns on 2nd Embodiment of this invention, the process of peeling the coating film for the predetermined width of both sides of a cut surface is also advanced in the diagonal cutting process.

  FIG. 3 (A) is a process flow showing the steel roofing material manufacturing method. The process flow includes the oblique cutting process P1, the separation process P2, and the recoil process P3 as in the first embodiment. The oblique cutting process P1 includes an initial position setting sub-process P11 prior to starting the moving cutting sub-process P12 from time T0. Further, P11 includes a process P112 for positioning the polishing rotor 431 of the coating film peeling portion 43, which will be described later, at the initial position.

  In the process P112, the polishing rotor 431 is disposed on the upstream side or the downstream side of the cutter 441. Further, in the moving cutting sub-process P12, the cutter 441 cuts the flat steel plate 1B from the oblique cutting start point 11 to the oblique cutting end point 12, and at the same time, the steel plate is cut into a predetermined width region along the oblique cutting line 13. The coating film peeling process P122 which peels a coating film is included.

  FIG. 3 (B) is a view showing a flat steel plate in which a partial coating film peeling step P122 and a moving cutting sub-step P12 and a separation step are carried out in the implementation of the steel roofing material manufacturing method. In addition to the planar steel plate 1B being processed, a separation portion 45 that performs the separation step P2 and a recoil portion 46 that performs the recoil step P3 are shown. These are the same as those in the first embodiment.

  Further, the movable cutting unit 44 used in the moving cutting sub-process P12 in the oblique cutting process P1 is the same as that used in the oblique cutting process P1 of the first embodiment. The flat steel plate 1B moves in the longitudinal direction downstream relative to the movable cutting portion 44, or the moving amount of the movable cutting portion 44 moves relatively upstream relative to the flat steel plate 1B. The cutter 441 mounted on the movable cutting unit 44 moves in the width direction. By this movement, the cutter 441 can cut the flat steel plate 1B as an oblique straight line from the oblique cutting start point 11 to the oblique cutting end point 12. This is also the same as in the first embodiment.

  In the steel roofing material manufacturing method according to the second embodiment of the present invention, the coating film peeling part 43 used in the coating film peeling process P122 performed in the moving cutting sub-process P12 is further shown. In FIG. 3 (B), it is provided on the upstream side of the movable cutting part 44. The coating film peeling part 43 peels the coating film for a width | variety suitably from the cutting part of the flat steel plate 1B which will be cut | disconnected with the cutter 441. FIG. The part from which the coating film has been peeled off is a part that is butted against other steel roofing material at the construction site of the roof. In order to ensure the electrical conductivity of this portion, the coating film is peeled off.

  The coating film peeling part 43 is the structure which has the grinding | polishing rotor 431 on the rotor axis | shaft 431b which passed the planar steel plate 1B to the width direction, for example. The polishing rotor 431 also moves in the width direction as the flat steel plate 1B moves in the longitudinal direction. The polishing rotor 431 is configured to have a peeling member on the outer periphery of the rotating rotor. The peeling member is a member that physically peels the coating film, and is composed of a hard brush or an abrasive.

  Since the polishing rotor 431 has a certain size, it must be provided away from the cutter 441. In implementation, it is arranged on the upstream side or the downstream side somewhat away from the cutter 441. In carrying out the moving cutting sub-process P12 and the coating film peeling process P122, the position in the longitudinal direction and the width direction of the coating film peeling portion 43 is controlled so as to pass on the oblique cutting line 13, and the cutter 441 is slightly delayed. It may be controlled so as to follow the polishing rotor 431 of the coating film peeling portion 43. Or you may control so that the grinding | polishing rotor 431 may follow this somewhat behind the cutter 441 which cut | disconnects on the diagonal cutting line 13. FIG.

  FIG. 3B shows a configuration in which the polishing rotor 431 precedes the cutter 441. The coating part is shown in gray. And the part from which the coating film was peeled is shown in white. In this configuration, the polishing rotor 431 first peels off the coating film on the oblique cutting line 13, and then cuts the flat steel plate 1 </ b> B with the cutter 441. On the other hand, FIG. 3D shows a configuration in which the cutter 441 precedes and the polishing rotor 431 follows this. In this configuration, the cutter 441 first cuts the oblique cutting line 13, and then the polishing rotor 431 peels the coating film of the flat steel plate 1B.

  FIG. 3C is a plan view in which the polishing rotor 431 precedes the cutter 441 and the oblique cutting process P1 including the coating film peeling process P122 and the moving cutting sub-process P12, the separation process P2, and the recoil process P3 are being completed. It is a figure of a steel plate. The flat steel plate 1B is near the end of cutting, and the portion that is cut and separated is wound around the recoil portion 46. As mentioned above, according to the steel roofing material manufacturing method which concerns on 2nd Embodiment demonstrated, manufacturing efficiency can be raised by peeling a coating film in parallel with cutting | disconnection.

[Third Embodiment]
Next, as a third embodiment of the present invention, a steel roof material manufacturing apparatus suitable for carrying out the steel roof material manufacturing method according to the first and second embodiments described above will be described. FIG. 4A is a plan view of a flat steel plate 1C as an example of a steel plate processed by the steel roofing material manufacturing apparatus. The flat steel plate 1C is a rectangular flat steel plate that has been coated except for the edges of the long sides. In the flat steel plate 1C, an oblique cutting start point 11 and an oblique cutting end point 12 and an oblique cutting line 13 connecting these are shown. The oblique cutting line 13 is shown for convenience of explanation, and such a line segment is not necessarily shown on the flat steel plate 1C.

  The distance from the side AD, which is one of the long sides of the flat steel plate 1C, to the oblique cutting start point 11 is referred to as a first upper bottom width. This is named because it matches the size of the upper base of the first trapezoidal steel plate 21 formed by the oblique cutting step P1. That is, the position where the flat steel plate 1C enters the flat steel plate 1C from the side AD, which is one of the long sides of the flat steel plate 1C, by a predetermined width is determined as the initial position of the cutter 441 in the oblique cutting process P1. It will be.

  In addition, the distance from the side BC, which is one of the long sides of the flat steel plate 1C, to the oblique cut opening end point 12 is referred to as a second upper bottom width. This is named because it matches the size of the upper base of the second trapezoidal steel plate 22 formed by the oblique cutting step P1. That is, the position where the second upper bottom width which is a predetermined width from the side BC which is one of the long sides of the flat steel plate 1C enters the flat steel plate 1C is determined as the cutting end position of the cutter 441 in the oblique cutting process P1. It will be.

  Note that the two upper trapezoidal steel plates cannot be manufactured by the oblique cutting step P1 unless the first upper base width and the second upper base width are shorter than the short side of the flat steel plate 1C. In addition, when the difference between the short side and the first upper bottom width matches the second upper bottom width, the two trapezoids formed by the oblique cutting process P1 are respectively rectangular steel plates. The sum of the first upper base width and the second upper base width is referred to as the upper base sum. When the upper base sum exceeds the length of the short side, the side by the corner A and the oblique cutting start point 11 becomes the lower base of the first trapezoidal steel plate, and the side by the corner C and the oblique cutting end point 12 is the second trapezoidal steel plate. It becomes the bottom.

  When using a long steel plate as the flat steel plate 1 </ b> C, the oblique cutting step P <b> 1 is performed while the long steel plate is conveyed in the longitudinal direction by the conveyance unit 40 described later. At this time, since the total distance that the transport unit 40 transports the long steel sheet is determined in advance, this is referred to as the total transport distance. The total transport distance coincides with the length of the long side of the flat steel plate 1C. Further, in the oblique cutting process P1, since the total movement amount of the cutter 441 that is controlled to move by the movable cutting unit 44 is also determined in advance, this will be referred to as the total cutter movement amount. A numerical value obtained by dividing the total cutter movement amount by the total conveyance distance is referred to as a cutting portion movement coefficient D.

  The cutter 441 is moved in the width direction by a distance obtained by multiplying the distance by which the long steel plate is conveyed by the cutting portion movement coefficient D while conveying the long steel plate by the conveyance unit 40. When the long steel plate is cut while moving the cutter 441 in the width direction in this way, a straight line having an inclination with respect to the long side of the flat steel plate 1C can be cut. This “cut portion movement coefficient D” is essentially the same as the “movement proportional coefficient C” described in the first and second embodiments.

<Device configuration>
4 (B) and 4 (C) are both a bird's-eye view of the steel roofing material manufacturing apparatus 4. The steel roofing material manufacturing apparatus 4 is an apparatus that processes a flat steel sheet 1C from the left side to the right side of the drawing. The uncoil part 41, the conveyance part 40, and the recoil part 46 are arranged from left to right. And from the left to the right, in the upper part, the up-down direction, or the inside of the transport unit 40, the pinch roller 42, the coating film peeling unit 43, the movable cutting unit 44, the pinch roller 42, and the separation unit 45. Is provided.

  The two pinch rollers 42 convey the flat steel plate 1 </ b> C input to the conveyance unit 40 from the left side to the right side of the drawing. For convenience of explanation, the direction in which the steel plate is fed by the transport unit 40 is defined as the longitudinal direction or the Y direction. The direction in which the steel sheet is sent is the negative direction, and the opposite is the positive direction. Moreover, the direction orthogonal to a longitudinal direction is made into the width direction or X direction in the upper surface of a steel plate, or the steel plate mounting surface of the conveyance part 40. FIG. The right-hand side when the steel sheet is directed in the direction in which it is sent out is defined as the positive direction in the width direction. Further, the side where the flat steel plate 1C is fed into the conveying unit 40, that is, the side where the uncoil portion 41 is located is referred to as the upstream side, and the destination of the flat steel plate 1C by the pinch roller 42, that is, the side where the recoil portion 46 is located is called the downstream side. Sometimes.

<Uncoil part>
The flat steel plate 1C is a long steel plate and is wound as a coil during storage. Therefore, in the oblique cutting process, the uncoiled portion 41 is rotatably held and is processed after being extended to a flat surface. Since it is a flat surface during processing, the steel plate to be processed is referred to as a flat steel plate 1C.

<Pinch roller>
The flat steel plate 1 </ b> C placed on the transport unit 40 is sent by the pinch roller 42 in the downstream direction in the longitudinal direction. The pinch roller 42 is sandwiched from the upper surface and the lower surface of the flat steel plate 1C, and conveys the flat steel plate 1C to the downstream side. The pinch roller 42 is a mechanism that rotates around a shaft that passes the conveying unit 40 in the width direction. The pinch roller 42 shown in FIGS. 4B and 4C shows a portion to which pressure is applied from the upper surface of the flat steel plate 1C.

  Although not shown, another roller of the pinch roller 42 incorporated in the roller of the transport unit 40 applies pressure from the lower surface of the flat steel plate 1C. In the figure, one pinch roller 42 is provided upstream and downstream of the coating film peeling portion 43 and the movable cutting portion 44. However, this is an example, and the number and position of the pinch rollers 42 may be changed as appropriate. In addition, the moving method of the flat steel plate 1 </ b> C thrown into the conveying unit 40 is not limited to the pinch roller 42, and may be moved by another alternative mechanism.

<Coating peeling part>
The coating film peeling part 43 is installed straddling the flat steel plate 1C in the width direction. The coating film peeling part 43 itself is fixed to the transport part 40 and does not move in the longitudinal direction. However, the coating film peeling portion 43 includes a polishing rotor 431, and the polishing rotor 431 is controlled so as to appropriately move in the width direction. The polishing rotor 431 is for peeling the coating film of the flat steel plate 1C.

<Mobile cutting part>
The movable cutting part 44 is also installed across the flat steel plate 1C in the width direction. The mobile cutting unit 44 is also fixed to the transport unit 40 itself and does not move in the longitudinal direction. However, the movable cutting unit 44 includes a cutter 441, and the cutter 441 is controlled so as to appropriately move in the width direction. The cutter 441 obliquely cuts the flat steel plate 1C.

<Moving control of polishing rotor>
The polishing rotor 431 of the coating film peeling unit 43 needs to be arranged at an initial position so that the coating film can be peeled off from the oblique cutting start point 11 of the flat steel plate 1C. For this reason, the position of the distance of the first upper bottom width in the positive direction in the width direction from the DA long side of the flat steel plate 1 </ b> C is set as the initial position of the polishing rotor 431. When the oblique cutting start point 11 of the flat steel plate 1C reaches the coating film peeling portion 43, the polishing rotor 431 is positive in the width direction by an amount obtained by multiplying the conveyance amount in the longitudinal direction of the flat steel plate 1C by the cutting portion movement coefficient D. Moved in the direction. Thus, when the movement of the polishing rotor 431 is controlled, the coating film on the oblique cutting line 13 of the flat steel plate 1C can be peeled off.

<Cutter movement control>
The movement control of the cutter 441 is the same as the movement control of the polishing rotor 431. The cutter 441 also sets the position of the distance of the first upper bottom width in the positive direction in the width direction from the DA long side of the flat steel plate 1C as the initial position. The oblique cutting start point 11, which is the tip of the flat steel plate 1 </ b> C, is sent downstream toward the movable cutting unit 44 on the transport unit 40. When the oblique cutting start point 11 reaches the movable cutting part 44, the cutter 441 moves in the positive direction in the width direction by an amount obtained by multiplying the conveyance amount in the longitudinal direction of the flat steel plate 1C by the cutting part movement coefficient D. Is done. Thus, if the movement of the cutter 441 is controlled, the oblique cutting line 13 of the flat steel plate 1C can be cut.

<Position relationship between the coating film peeling part and the mobile cutting part>
In the example shown in FIGS. 4B and 4C, the coating film peeling portion 43 is provided on the upstream side of the movable cutting portion 44. As the processing order, the coating film peeling portion 43 is provided in the preceding stage of the movable cutting portion 44. In this case, the movement of the polishing rotor 431 may be controlled as described above, and the movement may be controlled by following the cutter 441.

  Although not shown, the coating film peeling part 43 can also be provided on the downstream side of the movable cutting part 44. As the processing order, the coating film peeling portion 43 is provided at the subsequent stage of the movable cutting portion 44. In this case, the cutter 441 may be controlled to move using the cutting portion movement coefficient D as described above, and the polishing rotor 431 may be controlled to follow this.

<Manual start or automatic start>
FIG. 4B shows a state in which the flat steel plate 1C on the transport unit 40 has not yet reached the coating film peeling unit 43 and the mobile cutting unit 44 before starting the oblique cutting process. Eventually, when the oblique cutting start point 11 of the flat steel plate 1C reaches the coating film peeling part 43, the polishing rotor 431 starts moving, and when the oblique cutting start point 11 reaches the movable cutting part 44, the cutter 441 starts moving. To do.

  The timing at which the oblique cutting start point 11 reaches the coating film peeling unit 43 and the mobile cutting unit 44 is determined by visual observation by an operator of the steel roofing material manufacturing apparatus 4, and the coating film peeling unit 43 is timed. And the movement of the mobile cutting part 44 can be started. Alternatively, a polishing unit photoelectric sensor 432 may be provided in the coating film peeling unit 43 to automatically detect the arrival of the oblique cutting start point 11 to the coating film peeling unit 43 and start the movement of the polishing rotor 431. The mobile cutting unit 44 may also be provided with a cutting unit photoelectric sensor 442 to automatically detect the arrival of the oblique cutting start point 11 at the mobile cutting unit 44 and start the movement of the cutter 441.

  FIG. 4C shows a state in which the leading end portion of the flat steel plate 1 </ b> C further advances to the downstream side, and a part of the flat steel plate 1 </ b> C is wound up by the recoil portion 46 through the separation step by the separation portion 45. As an order of processing, the recoil portion 46 is provided at the subsequent stage of the separation portion 45. The separation unit 45 is a unit in which a separator 452 is provided on a separation shaft 451 passed in the width direction of the transport unit 40. The cut surface along the oblique cutting line 13 moves in the positive direction in the width direction as the flat steel plate 1C moves downstream. The separator 452 also moves in the positive direction in the width direction along the separation axis 451.

  The separator 453 has a thickness in the width direction that is equal to or greater than the minimum separation gap G1, and acts to separate the opposed cut surfaces of the flat steel plate 1C. Through the oblique cutting by the movable cutting part 44 and the separation process by the separation part 45, the flat steel sheet 1C which is the member to be cut is formed with a bifurcated part composed of two strip steel sheets. The minimum separation gap G1 is the total cutter movement amount.

  FIG. 4D is an end view taken along arrow Y1-Y1 in FIG. The polishing unit photoelectric sensor 432 includes a light emitting unit 432 a provided on the upper surface of the transport unit 40 and a light receiving unit 432 b provided on the lower surface. The electromagnetic wave emitted from the light emitting unit 432a is received by the light receiving unit 432b. However, when the flat steel plate 1C reaches here and the electromagnetic waves are blocked, the arrival timing is measured.

  FIG. 4E is an end view taken in the direction of arrows Y2-Y2 in FIG. The cutting unit photoelectric sensor 442 includes a light emitting unit 442 a provided on the upper surface of the transport unit 40 and a light receiving unit 442 b provided on the lower surface. The electromagnetic wave emitted from the light emitting unit 442a is received by the light receiving unit 442b. However, when the flat steel plate 1C reaches here and the electromagnetic waves are blocked, the arrival timing is measured.

  The method for detecting when the tip of the flat steel plate 1C reaches the position of the polishing rotor 431 or the cutter 441 is not limited to the photoelectric sensor. A switch-type sensor that contacts the flat steel plate 1C may be used. If the detection accuracy of “when it reaches” can be ensured, “when it reaches” may be detected from the change in the load of power for driving the polishing rotor 431 and the cutter 441.

  With the above apparatus configuration, when the oblique cutting process reaches the oblique cutting end point 12, two trapezoidal steel sheets can be obtained from the flat steel sheet 1C. In addition, by providing the coating film peeling part 43, the coating film in the seam welded region of the trapezoidal steel sheet is peeled off. These two trapezoidal steel plates will be referred to as a first trapezoidal steel plate 21 and a second trapezoidal steel plate 22 as described above.

  Since these are wound up by the recoil part 46, they are cylindrical coils as shown in FIG. Since the first trapezoidal steel plate 21 and the second trapezoidal steel plate 22 are wound apart by the separation gap 45 by more than the minimum separation gap G1, one of the trapezoidal steel plate coils does not interfere with the other trapezoidal steel plate coil. Can be separated. The coiled trapezoidal steel plate that can be easily separated in this way is convenient for transportation to the construction site of the roof.

  If the first upper base width and the second upper base width shown in FIG. 4 (A) are made equal, the first trapezoidal steel plate 21 and the second trapezoidal steel plate 22 become trapezoidal steel plates having a congruent shape. When the steel roof material manufacturing apparatus according to the third embodiment of the present invention performs the oblique cutting process in this way, the amount of steel material cut and removed can be reduced.

  The steel roof material manufacturing apparatus according to the fourth embodiment has been described on the premise that the steel roof material manufacturing apparatus is placed in a factory. However, there are cases where the steel roofing material manufacturing apparatus is actually installed at the site where the roof is constructed. In such a case, the two trapezoidal steel plates formed in a separated state via the separation portion 45 are formed and applied to the roof without being wound into a cylindrical shape. In this case, the recoil portion 46 is unnecessary in the steel roofing material manufacturing apparatus. Further, as will be described later, the recoil portion 46 is provided, and only one of the two trapezoidal steel plates may be wound around the cylindrical coil.

[Fourth Embodiment]
Next, a steel roofing material manufacturing method according to the fourth embodiment of the present invention will be described. The steel roofing material manufacturing method performs trimming cutting on the first trapezoidal steel plate 21 or the second trapezoidal steel plate 22 manufactured by the manufacturing method or manufacturing apparatus according to the first embodiment, the second embodiment, or the third embodiment. For example, a method of manufacturing an isosceles trapezoidal steel plate. The steel roofing material manufacturing method according to the fourth embodiment of the present invention will be described below as a process for adding processing to the first trapezoidal steel plate 21.

  FIG. 5A is a flowchart of a trimming process for manufacturing the isosceles trapezoid. For example, the first trapezoidal steel sheet 21 wound by the steel roofing material manufacturing method of the first embodiment is unwound at the roof construction site (process P4). However, as described above, when the recoil process P3 for winding the trapezoidal steel plate into a cylindrical shape is omitted, this process P4 is unnecessary. Next, the trimming process is completed through the trimming and cutting process P5.

  The trimming cutting step P5 includes a first trimming cutting (step P51) and a second trimming cutting (step P52) which will be described later. First, a longer angle of the first trapezoidal steel plate 21, that is, a right angle which is one end of the lower base is defined as a first base angle K1, and a diagonal of the first base angle K1 is defined as a second base angle K2. FIG. 5B shows the first base angle K1 and the second base angle K2 of the first trapezoidal steel plate 21. FIG.

  Next, as shown in FIG. 5 (C), the first trimming cutting line T1 forming a predetermined angle from the side that is the long side of the flat steel plate of the raw material amount and having the first base angle K1 as one end, The first base angle K1 is provided as a base point on the surface of the first trapezoidal steel plate 21 and cut. This predetermined angle is referred to as a first trimming angle A1. This is the first trimming cutting step (P51). Further, a second trimming cutting line T2 is provided on the surface of the first trapezoidal steel plate 21 parallel to the lower base side generated in the first trimming cutting step (P51) and having the second base angle K2 as a base point. To do. This is the second trimming cutting step (P52).

  The side generated in the second trimming cutting step (P52) becomes the upper base of the trapezoidal steel plate 211 formed in the trimming cutting step (P5). The trapezoidal steel plate 211 is an isosceles trapezoid if the edge K1 formed in the diagonal cutting step (P1), the angle K3 formed by the lower base generated in the first trimming cutting step (P51), and the first trimming angle A1 are equal. It has become.

  In addition to the process shown in FIG. 5C, a trimming cutting process (P5) can be performed as shown in FIG. First, in the side produced in the oblique cutting process (P1) of the steel roofing material manufacturing method according to the first embodiment or the second embodiment or the steel roofing material manufacturing device according to the third embodiment, the second base point A second trimming cutting line T2 forming a predetermined angle is provided on the surface of the first trapezoidal steel plate 21 with the second base point angle K2 as a base point from a side having the corner K2 as one end.

  This predetermined angle is referred to as a second trimming angle A2. This is the second trimming cutting step (P52). Further, the first trimming cutting line T1 parallel to the upper base side generated in the second trimming cutting step (P52) and having the first base angle K1 as a base point is provided on the surface of the first trapezoidal steel plate 21 and cut. To do. This is the first trimming cutting step (P51).

  The side generated in the second trimming cutting step (P52) becomes the upper base of the trapezoidal steel plate 211 formed in the trimming cutting step (P5). The angle K4 formed by the side that was the long side of the flat steel plate of the raw material amount with the first base angle K1 as one end, and the upper base generated in the second trimming cutting step (P52), and the second trimming angle A2 are If they are equal, the trapezoidal steel plate 211 is an isosceles trapezoid.

[Fifth Embodiment]
Next, based on FIG. 6, the steel roofing material manufacturing method which concerns on 5th Embodiment of this invention is demonstrated. The steel roofing material manufacturing method generally corresponds to the steel roofing material manufacturing method according to the second embodiment. The process flow by the coating film peeling part 43, the movable cutting part 44, and the separation part 45 is the same in the fifth embodiment and the second embodiment, and both are different in the recoil process P3.

  In recoil process P3, in 2nd Embodiment, the strip | belt-shaped steel plate spaced apart was wound by the cylinder shape by making the painted surface into the outer side (refer FIG.3 (C)). On the other hand, in 5th Embodiment, the said strip | belt-shaped steel plate is wound cylindrically so that the coated surface may be wound inside (refer FIG. 6 (B), (C1), (C2)). In order to wind in this way, in the fifth embodiment, at the beginning of winding, the recoil portion 46 is wound from the lower side, and the separated end portion AB of the flat steel plate 1C is adhered to the axial center surface of the recoil portion 46 with the adhesive tape 461. [Fig. 6 (A)]. Thus, when the painted surface is wound inward, the painted surface of the trapezoidal steel sheet wound in a cylindrical shape is hidden and protected inside, which is convenient during transportation.

  However, when the steel roofing material manufacturing method according to the fifth embodiment is performed at the construction site of the roof, a trapezoidal steel plate obtained in a separated state may be formed and applied through the separation step P2. In such a case, the recoil process is omitted. Even when the recoil process is omitted, the two trapezoidal steel plates separated by the separation step P2 have an effect that the construction work is easy to perform.

  In the two trapezoidal steel plates obtained through the oblique cutting process P1 and the separation process P2, the upper base and the lower base are opposite to each other. When constructing a trapezoidal steel plate on a roof, it may be necessary to align the upper and lower bases of two trapezoidal steel plates. For this purpose, one of the two trapezoidal steel plates must be rotated 180 degrees. However, some of these trapezoidal steel plates have a length exceeding 100 meters. It is not easy to rotate such a long trapezoidal steel plate on the roof.

  Therefore, among the two trapezoidal steel plates obtained through the oblique cutting step P1 and the separation step P2, the one that does not require rotation is used for roof construction as it is, and only the one that has to be rotated is subjected to the recoil step P3. it can. For example, FIG. 6D shows a state in which only one of the two strip-shaped steel plates is wound around a cylindrical coil through an oblique cutting process P1 and a separation process P2. In the embodiment of the present invention, the two strip steel plates are separated from the minimum separation gap through the separation step P3. For this reason, only one of the two strip steel plates can be wound in a cylindrical shape without interfering with each other.

A1 ... first trimming angle, A2 ... second trimming angle, C ... movement proportional coefficient,
D: Cutting portion movement coefficient, G: Separation gap, G1: Minimum separation gap, G2: Separation gap,
K1 ... first base angle, K2 ... second base angle, L ... oblique cutting distance, P1 ... oblique cutting step,
P2 ... separation step, P3 ... recoil process, P11 ... initial position setting sub-process,
T1 ... first trimming cutting line, T2 ... second trimming cutting line, 1 ... planar steel plate,
11 ... Diagonal cutting start point, 12 ... Diagonal cutting end point, 13 ... Diagonal cutting line,
1B, 1C ... painted flat steel plate, 21 ... first trapezoidal steel plate, 22 ... second trapezoidal steel plate,
4 ... Steel roofing material manufacturing apparatus, 40 ... Conveying section, 41 ... Uncoiled section, 42 ... Pinch roller,
43 ... coating film peeling part, 431 ... polishing rotor, 431b ... rotor shaft,
432 ... Polishing part photoelectric sensor, 432a, 442a ... Light emitting part,
432b, 442b ... light receiving part, 442 ... cutting part photoelectric sensor, 44 ... movable cutting part,
441 ... Cutter, 45 ... Separating part, 451 ... Separating shaft, 452, 453 ... Separator,
452a, 453a ... first separation surface, 452b, 453b ... second separation surface,
453c: separation cylinder, 46 ... recoil part, 461 ... adhesive tape.

Claims (12)

  An oblique cutting process for cutting a rectangular flat steel plate having a predetermined length and width, along a line segment that intersects both short sides of the rectangular flat steel plate and has an inclination with respect to the long side, and the oblique cutting A separation step of separating the opposing cut surfaces generated in the flat steel plate by a step to form a bifurcated portion made of two strip steel plates on the flat steel plate, and manufacturing a steel roofing material, Method.   The steel roofing material manufacturing method according to claim 1, further comprising a recoil process of winding at least one of the belt-shaped steel plates of the two strip-shaped steel plates forming the bifurcated portion into a tubular shape. Roof material manufacturing method.   In the steel roofing material manufacturing method according to claim 1 or claim 2, an intersection of one of the two intersections of the line segment having the inclination with respect to the long side and the both short sides is referred to as an oblique cutting start point, The other intersection is called the oblique cutting end point, the distance between the oblique cutting start point and the oblique cutting end point is called the oblique cutting distance, and the distance between the oblique cutting distances in the direction component parallel to the both short sides A steel roofing material manufacturing method characterized in that, when referred to as a minimum separation gap, in the separation step, the opposing cut surfaces are separated from each other by a distance equal to or greater than the minimum separation gap.   In the steel roofing material manufacturing method according to claim 3, the direction of the long side is referred to as the longitudinal direction, the direction of the short side on the planar steel plate is referred to as the width direction, and the longitudinal direction of the oblique cutting distance. When the numerical value obtained by dividing the distance of the direction component parallel to the width direction of the oblique cutting distance by the distance of the parallel direction component is referred to as a movement proportional coefficient, the oblique cutting step includes the oblique cutting start point. And an initial position setting sub-step for positioning the cutter in the longitudinal direction, and moving the cutter in the longitudinal direction relative to the flat steel plate, and multiplying the distance moved in the longitudinal direction by the movement proportional coefficient. And a moving cutting sub-process for cutting the flat steel plate while moving the flat steel plate in a width direction relative to the flat steel plate in a direction crossing the flat steel plate.   In the steel roofing material manufacturing method of any one of Claim 1, Claim 2, Claim 3, or Claim 4, in the area | region for the predetermined width | variety around the line segment which has an inclination with respect to the said long side. On the other hand, the steel roofing material manufacturing method characterized by having the peeling process which peels the coating film on the at least one surface of the said flat steel plate.   The steel roofing material manufacturing method according to claim 4, wherein the direction in which the cutter moves in the longitudinal direction relative to the flat steel plate is referred to as an upstream side, and the opposite direction of the upstream side is referred to as a downstream side. In this case, the initial position setting sub-step includes a step of disposing a polishing rotor provided with a peeling member on the outer periphery of the rotary rotor on the upstream side or the downstream side of the cutter, and the moving cutting sub-step Then, the polishing rotor and the cutter are moved in the longitudinal direction relative to the flat steel plate, and the polishing rotor and the cutter are moved by a distance obtained by multiplying the moving distance in the longitudinal direction by the movement proportional coefficient. The steel roofing material manufacturing method is characterized in that coating film peeling and cutting are performed on the planar steel plate while moving in the width direction relative to the planar steel plate.   7. The steel roofing material manufacturing method according to claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6, wherein the plane is obtained by completing the oblique cutting step. With respect to at least one of the two trapezoidal steel plates including two perpendicular trapezoidal steel plates formed from a steel plate, a right angle that is one end of the lower base having a longer length is defined as a first base angle. When the diagonal of the first angle is referred to as a second base angle, the side that is the long side of the flat steel plate is a predetermined angle from the side that has the first base angle as one end. A first trimming cutting line forming one trimming angle is provided on the trapezoidal steel plate surface with the first base point angle as a base point and cut, and is parallel to a side generated by the cutting and is based on the second base point angle. 2 Trimming by cutting the trimming cutting line on the trapezoidal steel plate surface Steel roofing manufacturing method characterized by having a cross-sectional process.   7. The steel roofing material manufacturing method according to claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6, wherein the plane is obtained by completing the oblique cutting step. With respect to at least one of the two trapezoidal steel plates including two perpendicular trapezoidal steel plates formed from a steel plate, a right angle that is one end of the lower base having a longer length is defined as a first base angle. And when the diagonal of the first angle is referred to as a second base angle, a second trimming cutting line that forms a second trimming angle that is a predetermined angle from the side generated in the oblique cutting step, Provided and cut on the trapezoidal steel plate surface with the second base angle as a base point, and provided with a first trimming cutting line on the trapezoidal steel plate surface parallel to the side generated by the cutting and having the first base angle as a base point A trimming cutting step for cutting is provided. Manufacturing roofing material manufacturing method.   A conveyance unit that includes a pinch roller, conveys a long steel plate in the longitudinal direction, a cutter that cuts the steel plate conveyed by the conveyance unit, and a cutting unit that controls movement in the width direction across the conveyance unit; A separation part that separates opposing cut surfaces generated in the member to be cut by the cutting part and forms a forked part made of two strip-shaped steel plates on the member to be cut; The total distance for transporting the long steel sheet is determined as the total transport distance, the total movement amount of the cutter controlled in advance by the cutting unit is determined as the total cutter movement amount, and the total cutter movement amount is divided by the total transport distance. When the obtained numerical value is referred to as a cutting portion movement coefficient, while the long steel plate is conveyed in the longitudinal direction, only the distance obtained by multiplying the distance that the long steel plate is conveyed by the conveyance by the cutting portion movement coefficient. , The long steel plate is cut while moving the cutter in the width direction, and the opposing cut surfaces generated in the flat steel plate by the cutting of the cutter by the cutting portion are more than the total cutter movement amount by the separation portion. A steel roofing material manufacturing apparatus characterized by being largely separated.   The steel roofing material manufacturing apparatus according to claim 9, wherein a recoil portion for winding at least one of the two strip-shaped steel plates constituting the bifurcated portion in a cylindrical shape is provided at a subsequent stage of the spacing portion. The steel roofing material manufacturing apparatus characterized by being.   11. The steel roofing material manufacturing apparatus according to claim 9, wherein the separation portion is arranged in a width direction along the separation axis, on a separation axis that is passed across the conveyance portion in the width direction. The separator is held so as to be freely movable. The separator contacts one of the opposing cut surfaces generated on the flat steel plate, and separates the one cut surface from the other cut surface. A first spacing surface that pushes out in the direction and a second spacing surface that touches the other cutting surface and pushes the other cutting surface away from the one cutting surface, with a predetermined interval in the width direction. A steel roofing material manufacturing apparatus characterized by comprising: The steel roofing material manufacturing apparatus according to any one of claims 9, 10, or 11, wherein a coating film peeling portion that peels a coating film of the flat steel plate by a predetermined width is a front stage of the cutting portion or A steel roofing material manufacturing apparatus provided at a subsequent stage.