JP2014147183A - Method of producing cylindrical exterior material and method of manufacturing wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of producing a cylindrical exterior material and a method of manufacturing a wire harness capable of reducing the production cost.SOLUTION: A method of producing a cylindrical exterior material includes an embossing step for forming protrusions and recesses arranged regularly and adjacently in a sheet base material 75 by embossing, and a rounding step for shaping the sheet base material 75, in which protrusions and recesses are formed in the embossing step, cylindrically by bending.

Description

  The present invention relates to a method for manufacturing a tubular exterior material and a method for manufacturing a wire harness using the same.

  A so-called wire harness, which is an assembled electric wire for a vehicle, is configured by assembling various cylindrical exterior materials. As this cylindrical exterior material, corrugated tubes that are excellent in wear resistance and can be bent along the routing route are frequently used (for example, see Patent Documents 1 and 2).

  The corrugated tube has a bellows shape in which concave and convex shapes composed of a large diameter portion and a small diameter portion are alternately formed in the longitudinal direction. The corrugated tube has a function of suppressing damage to the coating of the electric wire by reducing the contact area between the wire harness inserted inward and the other member and increasing the distance from the other member due to the uneven shape. Have.

  Moreover, the slit is formed in the general corrugated tube over the longitudinal direction for the assembly | attachment to a wire harness.

JP-A-10-136531 JP 2003-259528 A

  An example of the conventional manufacturing method of such a corrugated tube (cylindrical exterior material) is demonstrated. FIG. 12 is a diagram showing each step in a conventional method for manufacturing a corrugated tube.

  In the conventional method for manufacturing a corrugated tube illustrated in FIG. 12, first, a cylinder in which a concavo-convex shape is formed on the surface by extrusion molding using a resin material in a base material forming step ((a) in FIG. 12). A base material 93 continuous in a shape (tube shape) is formed. The code | symbol 91 in FIG. 12 has shown the extrusion molding machine used for extrusion molding. In the next winding step ((b) in FIG. 12), the cylindrical base material 93 formed in the base material forming step is wound using the roller 95, and then the slit processing step which is the next step. ((C) in FIG. 12). In the slit processing step, slit processing is performed along the longitudinal direction of the base material 93 to form a cylindrical base material 96 having a slit (not shown). The cylindrical base material 96 is boxed in a state where it is wound and wound again in the next winding process ((d) in FIG. 12).

  The cylindrical base material forming step including the base material forming step, the winding step, and the slit processing step described above is performed, for example, in a parts factory for manufacturing a cylindrical base material. This cylindrical base material forming step is performed at the parts factory separately from the process performed at the wire harness (W / H) factory described below, and is extrusion molding used in the cylindrical base material forming step. This is because the machine 91 and the like are relatively large-scale facilities.

  The box-shaped cylindrical base material 96 obtained in the cylindrical base material forming step is transported to a W / H factory by transport means such as a ship, a railroad, and a vehicle (transport step, (e in FIG. 12). )).

  In the W / H factory, the cylindrical substrate 96 is cut after being measured in the measuring and cutting step ((f) in FIG. 12), whereby a corrugated tube 97 having a predetermined length is formed. The By sequentially performing the steps described above, the cylindrical base 96 is manufactured at the parts factory, and the corrugated tube 97 is manufactured at the W / H factory based on the base.

  The corrugated tube 97 thus obtained is assembled to the covered electric wire 99 in the W / H assembling step ((f) in FIG. 12). Thereby, the wire harness by which the corrugated tube 97 was assembled | attached as an exterior material is manufactured. That is, it can be considered that the manufacturing method of the said corrugated tube is a part of process of the manufacturing method of a wire harness.

  Incidentally, in recent years, there has been a demand for a reduction in manufacturing cost including physical distribution costs regarding a method for manufacturing a tubular exterior material such as a corrugated tube and a method for manufacturing a wire harness using the same.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the manufacturing method of the cylindrical exterior material which can reduce manufacturing cost, and the manufacturing method of a wire harness.

In order to achieve the above-described object, the method for manufacturing a tubular exterior material according to the present invention is characterized by the following points.
(1) An embossing process for embossing a sheet-like base material to form an uneven shape on the base material that is regularly arranged adjacent to each other;
A rounding step of bending the base material on which the uneven shape is formed by the embossing step into a cylindrical shape;
Including.

In the above-described conventional method for manufacturing a cylindrical exterior material, after manufacturing a cylindrical base material in which a concavo-convex shape is formed in a parts factory, the cylindrical base material is wound on a W / H factory. transport. And an exterior material is manufactured in a W / H factory based on the conveyed cylindrical base material. However, when the cylindrical base material is wound and packed in this manner, the cylindrical base material is hollow and the inside is hollow, so that packing efficiency is poor and transport efficiency may be deteriorated.
On the other hand, in the manufacturing method of the cylindrical exterior material of the structure of said (1), a cylindrical exterior material is manufactured based on a sheet-like base material. For this reason, for example, after manufacturing a base material in a parts factory, even if the manufactured base material is transported to a W / H factory, if a sheet-like base material is transported from the parts factory to the W / H factory, Good. In this case, since the sheet-like base material can be layered and wound without gaps, the packing efficiency is improved, thereby improving the transport efficiency. For this reason, physical distribution cost can be reduced and manufacturing cost can be reduced.
Moreover, the diameter and kind which are required for the cylindrical exterior material differ according to the attachment site | part with respect to a wire harness. For this reason, in the base material forming step in the above-described conventional method for manufacturing a cylindrical exterior material, when forming a cylindrical base material, extrusion is performed using a dedicated die according to the required diameter and type. It is necessary to carry out molding. For this reason, an extruder or the like used in the cylindrical base material forming step tends to be a relatively large-scale facility. As a result, the cylindrical base material forming step is generally performed in a dedicated parts factory.
On the other hand, in the manufacturing method of the cylindrical exterior material of the structure of said (1), a cylindrical exterior material is manufactured based on a sheet-like base material. For this reason, the extrusion molding machine etc. which are used in an extrusion molding process may be a comparatively small-scale installation. For this reason, manufacturing cost can be reduced. In addition, since the extrusion molding process can be realized with relatively small equipment, each process including the sheet base material molding process can be performed in a W / H factory having a smaller site area than conventional ones.

(2) A method for producing a tubular exterior material having the configuration of (1) above,
A base material forming step of forming a sheet-like base material by extrusion,
Cutting out the base material having a predetermined width by cutting the base material formed by the base material forming step in the longitudinal direction; and
A sheet base material forming step that is performed before the embossing step.
about.

As described above, in the base material forming step in the conventional method of manufacturing a cylindrical exterior material, a cylindrical base material is formed by extrusion molding, so a dedicated mold corresponding to the required diameter and type is used. It was necessary to perform extrusion molding. In such a case, since the time required for extrusion molding differs depending on the mold, there is a possibility that the production speed varies, and this variation may increase the manufacturing cost. Moreover, there existed a possibility that the extrusion molding machine etc. which are used at an extrusion molding process may become a large-scale installation.
On the other hand, in the manufacturing method of the cylindrical exterior material having the configuration (2), the base material formed into a wide sheet shape by extrusion molding in the base material forming process is cut in the longitudinal direction in the cutting process. In order to cut out a base material having a predetermined width corresponding to the required diameter, the shape of the base material formed by extrusion molding in the base material forming step is affected by the required diameter of the exterior material. There is nothing. For this reason, a base material can be made common irrespective of the diameter of a required exterior material, etc., and manufacturing cost can be reduced. Moreover, since cylindrical exterior materials having various diameters are manufactured based on the common sheet-like base material, the processing steps are not complicated. For this reason, the extrusion molding machine etc. which are used in the base material molding process may be a relatively small-scale facility. As a result, the manufacturing cost can be reduced. In addition, since the base material forming process can be realized with a relatively small facility, for example, a method for manufacturing a cylindrical exterior material including a sheet base material forming process in a W / H factory having a smaller site area than conventional ones is performed. Can do.

(3) A method for manufacturing a tubular exterior material having the structure according to any one of (1) and (2) above,
In the embossing step, as the uneven shape, a recess is formed on the surface of the substrate,
The recess is
A polygonal lattice portion formed on the surface of the base material and arranged symmetrically so as to have a pair of V-shaped ridge lines in plan view and facing the V-shaped opening side;
A trough having a pair of inclined fold lines extending from the top of each V-shaped ridge line in plan view so as to incline toward the back surface side of the base material and approach each other, and a horizontal fold line connecting the tip ends of these inclined fold lines And comprising
about.

By the way, when trying to manufacture a bellows-shaped corrugated tube from a sheet-like base material, a corrugated sheet sheet in which concave grooves and ridges are alternately formed is rounded so that concave and convex portions are alternately arranged in the tube axis direction. In addition, since the concavo-convex portion exhibits structural rigidity (becomes a beam structure), it is difficult to manufacture a bendable corrugated tube.
On the other hand, in the manufacturing method of the cylindrical exterior material having the above configuration (3), the recesses regularly adjacent to the surface of the sheet-like base material are formed by embossing, and the ridge lines of the recesses are flush with the surface. Be placed. Concavities and convexities for ensuring wear resistance are formed on the front and back surfaces of the substrate by inexpensive embossing. In addition, on the surface of the base material, there are a polygonal lattice portion in which a plurality of concave portions having a pair of V-shaped ridge lines in a plan view are regularly arranged in the vertical and horizontal directions, and an inclined fold line and a horizontal fold line of a trough portion that become continuous fold lines Composed. Thus, the sheet-like base material in which the concave portion is formed can be easily bent around a horizontal fold line or an orthogonal line orthogonal to the horizontal fold line and rounded into a cylindrical shape.
Furthermore, when a trough part has a horizontal folding line, when a sheet-like base material is rolled up into a cylinder shape, it can be comprised so that the trough part which protrudes to an internal peripheral surface or an outer peripheral surface may not be sharpened. As a result, the exterior material in which the sheet-like base material is rolled into a cylindrical shape increases the contact area of the valley portion that protrudes from the inner peripheral surface or the outer peripheral surface and contacts the exterior product or external component. Thereby, the exterior material rolled into the cylindrical shape can suppress damage to an inner sheathed product (for example, a covered electric wire) or an outer external component (for example, another wire harness).

In order to achieve the above-described object, the wire harness manufacturing method according to the present invention is characterized by the following points.
(4) The assembly | attachment process of assembling | attaching the said base material shape | molded by the said rounding process in the manufacturing method of the cylindrical exterior material of any one structure of said (1)-(3) to at least 1 electric wire. Including.

  According to the method of manufacturing the wire harness having the configuration (4), the packaging efficiency of the exterior material is improved and the transportation efficiency is improved, so that the distribution cost can be reduced, and thus the manufacturing cost can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the cylindrical exterior material which can reduce manufacturing cost, and the manufacturing method of a wire harness can be provided.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

FIG. 1 is a perspective view of a portion of the exterior material according to the embodiment as viewed from the front side. FIG. 2 is a plan view of the exterior material shown in FIG. 3 is a cross-sectional view taken along the line III-III of the exterior material shown in FIG. FIG. 4 is a partial perspective view of a tubular exterior material formed into a tubular shape by curving the exterior material on the back surface side of the sheet base material along the horizontal folding line of the recess. FIG. 5 is a perspective view of a main part of a wire harness in which the tubular exterior material shown in FIG. 4 is wound around the outer peripheral surface of the covered electric wire. 6 is a cross-sectional view taken along the line VI-VI of the wire harness shown in FIG. FIG. 7A is a front view of the wire harness bent so that both end sides of the cylindrical exterior material shown in FIG. 5 are close to each other, and FIG. 7B is an enlarged view of the main part of FIG. It is. Drawing 8 is a figure showing each process in a manufacturing method of a cylindrical exterior material concerning an embodiment. FIG. 9 is an explanatory view for explaining the cutting process and the winding process shown in FIG. 8 in more detail. FIG. 10 is an explanatory diagram for explaining the embossing process and the rounding process shown in FIG. 8 in more detail. FIG. 11 is a perspective view showing a modification of the uneven shape formed on the sheet base material. FIG. 12 is a diagram showing each step in a conventional method for manufacturing a corrugated tube.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a tubular exterior material and an embodiment of a method for manufacturing a wire harness according to the present invention will be described with reference to the drawings. First, with reference to FIGS. 1-7, the structure of the cylindrical exterior material manufactured by the manufacturing method of the cylindrical exterior material which concerns on embodiment is demonstrated.

  As shown in FIG. 1, the sheet-like exterior material 11 has a plurality of recesses formed in the same shape by embossing on the surface of a long sheet base material (not shown) slit to a predetermined width. 15 are regularly formed adjacent to each other vertically and horizontally (X direction, Y direction). That is, a concavo-convex shape that is regularly arranged adjacent to each other is formed. In the illustrated example, the recesses 15 are arranged in a staggered manner. Each concave portion 15 has a lattice portion 17 and a valley portion 21.

  As shown in FIG. 2, each lattice portion 17 of the present embodiment has a pair of V-shaped ridge lines 23 in a plan view and extends in the sheet width direction (X direction) so that the V-shaped opening sides face each other. 25 are arranged symmetrically with respect to each other, and a plurality of polygons are formed on the surface of the sheet base material.

  As shown in FIG. 3, the valleys 21 of the present embodiment are inclined from the tops 27 of the V-shaped ridge lines 23 in plan view to the back surface side (the lower side in FIG. 3) of the sheet base material. A pair of inclined folding lines 19 extending so as to approach each other, and a horizontal folding line 29 is provided at the tip of these inclined folding lines 19. Since the horizontal folding line 29 according to the present embodiment is formed by a forming die having an R portion at the tip so as not to break the sheet base material during embossing, it has a predetermined width as shown in FIG. It is formed in a groove shape.

  The concave portion 15 of the exterior material 11 according to the present embodiment includes a horizontal ridge line 31 that extends in parallel with the horizontal folding line 29 by connecting each V-shaped opening side end of the V-shaped ridge line 23 in plan view. Thereby, a pair of planar view V-shaped ridgeline 23 is connected via the horizontal ridgeline 31 in the recessed part 15, and as shown in FIG. 2, the lattice part 17 of the recessed part 15 is hexagonal by planar view. The lattice portion 17 of the concave portion 15 having a hexagonal shape in plan view is a portion formed by intersecting three ridgelines with the respective top portions 27 of the ridgeline 23 having a V shape in plan view.

Further, the exterior material 11 according to the present embodiment is formed by forming a plurality of recesses 15 by embossing on the surface of a thermoplastic resin sheet base material, and then heat-molding it into a pipe shape as shown in FIG. It is used as the outer packaging material 43. The exterior material 11 can be formed of an elastic material having sufficient flexibility that can be bent or rounded by human force.
That is, the exterior material 11 can be used by appropriately changing the material depending on the method of use, and various sheet base materials such as paper, metal, cloth, and resin-impregnated fibers can be used in addition to synthetic resin and silicone. .

Next, the effect | action of the exterior material 11 which has the said structure is demonstrated.
In the exterior material 11 according to the present embodiment, the recesses 15 that are regularly adjacent to each other are formed on the surface of the sheet base material by embossing, and the pair of V-shaped ridge lines 23 in plan view are connected via the horizontal ridge lines 31. Hexagonal lattice portions 17 serving as 15 ridge lines are arranged in the same plane as the surface of the sheet base material. That is, when the exterior material 11 is turned upside down and viewed from the back side, the ridges 39 (see FIG. 3) protrude from the back side due to the formation of the recess 15.

  Further, on the surface of the exterior material 11, a hexagonal lattice portion 17 in which a plurality of concave portions 15 having a pair of V-shaped ridge lines 23 and horizontal ridge lines 31 are arranged in a regular vertical and horizontal direction, and valley portions that form continuous folding lines 21 inclined fold lines 19 and horizontal fold lines 29 are formed. Thus, unlike a conventional exterior material that rolls a corrugated sheet in which concave and convex convex shapes are alternately formed so that concave and convex portions are alternately arranged in the tube axis direction, the exterior material in which concave portions 15 are formed on the sheet base material 11 can be easily bent around a horizontal folding line 29 or an orthogonal line 41 orthogonal to the horizontal folding line 29 and rounded into a polygonal cylindrical shape. In addition, since the exterior material 11 has a continuously formed shape of irregularities, it is possible to make the diameter of the cylinder variable by engaging the irregularities when rounding into a cylindrical shape. ing.

  Furthermore, since the valley part 21 has the horizontal folding line 29, it can be comprised so that the peak part 39 which protrudes in the back surface side by forming the recessed part 15 may not be sharpened. That is, the exterior material 11 protrudes from the back surface of the sheet base material, and the ridge 39 that contacts the covered wire 61 that is an exterior product and another wire harness that is an external component is formed in the back of the horse, thereby increasing the contact area. . Thereby, the exterior | packing material 11 can suppress the damage | wound etc. by the peak part 39 to the covered electric wire 61 or another wire harness (refer FIG. 5, 6).

Next, an example of a method of using the exterior material 11 having the above configuration will be described.
As shown in FIG. 4, the exterior material 11 according to the present embodiment is curved toward the back surface side of the sheet base material along the horizontal folding line 29, and has a central axis along an orthogonal line 41 orthogonal to the horizontal folding line 29. And is used as a cylindrical outer covering material 43 that is formed around the outer peripheral surface of the plurality of covered electric wires 61. The curvature of the exterior material 11 is performed by thermoforming, and the exterior material 11 that has become a cylindrical shape as the tubular exterior material 43 does not return to the planar state again. The cylindrical exterior member 43 is used in a state where the tip ends that are rounded into a cylindrical shape are overlapped or have a slit.

As shown in FIG. 5, after the exterior material 11 is cut to a predetermined length, the tubular exterior material 43 wound around the outer peripheral surface of the plurality of covered electric wires 61 is fixed with adhesive tape T at both ends of the axis. Thus, the covered electric wire 61 is fixed to a predetermined position in a state in which the opening of the slit is prevented, and the covered electric wire 61 is protected from contact with an external part such as a vehicle body.
As shown in FIG. 6, the tubular exterior material 43 is formed by rolling the exterior material 11 into a tubular shape, and as shown in FIG. 6, the ridge 39 projecting inward on the back side of the sheet base material is projected inward. To do. The peak 39 protruding inward contacts the covered electric wire 61 accommodated, but the peak 39 is formed in the shape of a horse back by the valley 21 having the horizontal folding line 29, and the contact area with the covered electric wire 61 increases. It is configured not to be sharp.

  The length of the horizontal folding line 29 can be adjusted by the inclination angle θ of the inclined folding line 19 and the depth of the recess 15. That is, in the exterior material 11, the depth of the recess 15, the inclination angle θ of the inclined folding line 19, and the length of the horizontal folding line 29 are optimally adjusted according to the outer diameter of the covered electric wire 61 to be protected. Thus, by forming the horizontal folding line 29 having an optimal length in accordance with the covered electric wire 61, a cylinder that protrudes to the inner peripheral surface when the exterior material 11 is rolled into a cylindrical shape with the back surface side of the sheet base material as the inner side. The ridge 39 of the outer packaging material 43 is configured not to be sharpened so that the covered electric wire 61 can be prevented from being damaged.

Next, an effect | action at the time of bending so that the axial both ends side of the cylindrical cladding | exterior_material 43 wound around the covered electric wire 61 may approach is demonstrated.
The exterior material 11 of the present embodiment is curved on the back surface side of the sheet base material along the horizontal folding line 29, and is formed into a cylindrical tubular exterior material 43 having a central axis along an orthogonal line 41 orthogonal to the horizontal folding line 29. When formed, the pair of opposed inner surfaces 49a and 49b of the recess 15 are oriented along the central axis direction of the cylinder.

  Here, the recessed part 15 of the exterior material 11 is an inner space part of the boat-shaped box 45 formed on the surface of the sheet base material as shown in FIGS. 1 and 3. The concave portions 15 are connected to each other by a valley portion 21 in which the top portions 27 of the V-shaped ridge line 23 in plan view are continuous fold lines of a pair of inclined fold lines 19 and a horizontal fold line 29 connecting the tip ends of the inclined fold lines 19. ing. The concave portion 15 is easily deformed and greatly deformed in the direction in which the pair of opposed inner surfaces 49a and 49b approaching and separating from the valley portion 21 in the boat-shaped box body 45. That is, the boat-shaped box 45 can be greatly deformed in the sheet width direction (X direction). On the other hand, the concave portion 15 is not easily deformed by the bending fold line 19 and the horizontal fold line 29 of the trough portion 21 in the direction (Y direction) in which the pair of top portions 27 approach and separate from each other, and the deformation amount is small. For this reason, the exterior material 11 in which the plurality of concave portions 15 are arranged in the vertical and horizontal directions easily expands and contracts in the sheet width direction (X direction) in the flat plate state shown in FIG. 1, but in the sheet longitudinal direction (Y direction). Is hard to stretch. Thus, the exterior material 11 has directivity in the stretchability in the in-plane direction.

  When the cylindrical tubular packaging material 43 is bent so that both end sides of the axis are close to each other, the stress that causes expansion and contraction between the pair of opposed inner surfaces 49a and 49b acts on the concave portion 15, but the concave portion 15 that opens to the outer peripheral surface side Deformation is easy and the amount of deformation is large in the direction in which the pair of opposed inner surfaces 49a, 49b approach and separate. For this reason, as shown in FIGS. 7A and 7B, when the tubular exterior material 43 is bent, a tensile stress is generated on the outer side of the bent portion 51, and the gap between the pair of opposed inner surfaces 49a and 49b is generated. It extends with a large amount of deformation, compressive stress is generated inside the bent portion 51, and the space between the pair of opposed inner surfaces 49a, 49b contracts with a large amount of deformation. As a result, the cylindrical exterior material 43 can be easily bent. Therefore, it is possible to easily obtain the tubular exterior material 43 that can be bent along the wiring path of the covered electric wire 61.

  On the other hand, the exterior material 11 is rounded so as to be curved toward the surface side of the sheet base material along the horizontal folding line 29 and is formed in a cylindrical shape having a central axis along an orthogonal line 41 orthogonal to the horizontal folding line 29. In this case, the pair of opposed inner surfaces 49a, 49b of the recess 15 are arranged along the central axis direction of the cylinder. And when bending this cylindrical exterior material 11 so that both ends of an axis line may approach, the stress which expands and contracts between a pair of opposing inner surface 49a, 49b acts on the recessed part 15, but a cylindrical inner peripheral surface side The pair of opposed inner surfaces 49a, 49b in the recess 15 that opens to the side cannot be easily bent in the direction of approaching and separating, and the amount of deformation is small, so that it cannot be bent easily. Therefore, when the exterior material 11 is rounded so as to be curved toward the surface side of the sheet base material along the horizontal folding line 29, the tubular exterior used for the routing route of the covered electric wire 61 required to have a straight line holding property. The material 11 can be obtained.

  Further, the exterior material 11 is rounded so as to be curved toward the back surface side or the front surface side of the sheet base material along the orthogonal line 41 orthogonal to the horizontal folding line 29, and formed into a cylindrical shape having a central axis along the horizontal folding line 29. In this case, the pair of top portions 27 are arranged along the central axis direction of the cylinder. And when bending the cylindrical exterior material 11 so that both ends of the axial line approach each other, the stress for expanding and contracting the tops 27 of the recesses 15 acts on the recesses 15, but in the direction in which the pair of tops 27 approach and separate from each other. The recess 15 is difficult to deform and the amount of deformation is small, so it does not bend easily. Therefore, when the exterior material 11 is rounded so as to bend toward the back surface side or the front surface side of the sheet base material along the orthogonal line 41 orthogonal to the horizontal folding line 29, the arrangement of the covered electric wire 61 required to maintain straightness is required. It can be set as the cylindrical exterior material 11 used for a cable path.

  As described above, in the packaging material 11 of the present embodiment, the direction of rounding into a cylindrical shape can be divided into four types according to the front and back of the sheet base material and the parallel orthogonal direction of the central axis direction of the cylinder with respect to the horizontal folding line 29. It is only one way that the outer packaging material 43 is easily bent so that the outer packaging material 11 is rounded into a cylindrical shape having a central axis along the orthogonal line 41 that is curved toward the back surface side of the sheet base material. For this reason, the exterior material 11 provided with the several recessed part 15 for ensuring abrasion resistance can be selectively used for a bending part and a straight part by selecting the rounding direction formed in a cylinder shape.

  In the above-described embodiment, the recess 15 of the exterior material 11 includes the horizontal ridge line 31 that extends in parallel with the horizontal folding line 29 by connecting each V-shaped opening side end of the V-shaped ridge line 23 in plan view. However, the horizontal ridge line 31 does not appear and the lattice part 17 of the recess 15 has a rhombus shape by connecting a pair of V-shaped ridge lines 23 in plan view. It does not matter as a configuration.

  Next, with reference to FIGS. 8-10, the method to manufacture the said cylindrical cladding | exterior_material 43 is demonstrated. FIG. 8 is a diagram showing each step in the method of manufacturing the cylindrical exterior material according to the present embodiment. FIG. 9 is an explanatory view for explaining the cutting process and the winding process shown in FIG. 8 in more detail. FIG. 10 is an explanatory diagram for explaining the embossing process and the rounding process shown in FIG. 8 in more detail.

  In the manufacturing method of the cylindrical exterior material according to the present embodiment, first, in the base material forming step ((a) in FIG. 8), a long continuous sheet-like material is formed by extrusion using a thermoplastic resin material. A base material 71 is formed (reference numeral 73 in FIG. 8 indicates an extruder). In the next cutting step ((b) in FIG. 8), the base material 71 formed in the base material forming step is cut along the longitudinal direction, whereby a plurality of sheet base materials 75 having a predetermined width are cut out. It is. The plurality of sheet base materials 75 are packed in a state where they are wound and wound in the winding step ((c) in FIG. 8) of the next step. In this embodiment, the sheet | seat base material shaping | molding process which consists of the base material shaping | molding process, cutting process, and winding process which were demonstrated above is implemented in a W / H factory. Unlike the above-described conventional manufacturing method, this base material forming step is performed not at a dedicated parts factory but at a W / H factory because an extruder 73 or the like necessary for the sheet base material forming process is used. This is because the equipment is smaller than conventional equipment.

  More specifically, as shown in FIG. 9, the cutting step is performed in parallel along the longitudinal direction of the base material 71 so that the base material 71 formed in the base material forming step is easily cut. A notch forming step ((a) in FIG. 9) in which the notch 77 is formed is included. The interval between the notches 77 is set to a length corresponding to the diameter of the cylindrical exterior material 43 (covered electric wire 61) that is the target. For example, the intervals may be equal intervals, or may be different intervals for each cut 77. In the cutting step, the base material 71 in which the cuts 77 are formed in the cut forming step is divided by the cuts 77 and cut to cut out a plurality of sheet base materials 75 having a predetermined width. It further includes a step ((b) in FIG. 9). As described above, the plurality of sheet base materials 75 cut out in the cutting step are wound and wound in the next winding step ((c) in FIG. 8, (c) in FIG. 9). It is packed in a box.

  As shown in FIG. 8, the sheet base material 75 packed in a box obtained in the sheet base material forming step is a sheet different from the production line for forming the sheet base material in the W / H factory that performs the above steps. It is carried to the manufacturing line for base-material processing (a conveyance process, (d) in FIG. 8).

  In the production line for sheet base material processing, first, in the embossing process ((e) in FIG. 8, (a) in FIG. 10), the sheet base material 75 is embossed. As shown in FIGS. 1 to 3, the plurality of recesses (15) are formed so as to be regularly arranged adjacent to each other. In the embossing process, as shown in FIG. 10A, the heated sheet base material 75 is embossed by a pair of rotating embossing rollers 79. As a result, a sheet-shaped exterior material 11 having a predetermined uneven shape is formed. Then, in the next rounding step ((f) in FIG. 8, (b) in FIG. 10), the exterior material 11 in which the concavo-convex shape is formed by the embossing step is curved to have a tubular shape (tube shape). To form a cylindrical exterior material 43. In the rounding step, as shown in FIG. 10B, the heated exterior material 11 is deformed in accordance with the cylindrical mold. Thereafter, the long cylindrical outer packaging material 43 obtained in the rounding step is cut after being measured in the measuring and cutting step ((g) in FIG. 8, (c) in FIG. 10), thereby A cylindrical exterior material 43 having a predetermined length is formed. By sequentially performing the steps described above, a sheet-like sheet base material 75 is manufactured at the W / H factory, and the tubular exterior material 43 is manufactured based on the sheet base material 75.

  The cylindrical outer packaging material 43 thus obtained is assembled to at least one covered electric wire 61 in the W / H assembling step ((h) in FIG. 8). Thereby, the wire harness W (refer FIG. 5) with which the cylindrical exterior material 43 was assembled | attached is manufactured. That is, it can be considered that the manufacturing method of the said cylindrical cladding | exterior_material is a part of process of the manufacturing method of a wire harness. That is, the wire harness W according to the embodiment is manufactured by sequentially performing the steps described above. In addition, the covered electric wire with which the cylindrical exterior member 43 is assembled may be one or plural.

  In addition, in the manufacturing method of the cylindrical exterior material and the manufacturing method of a wire harness which were demonstrated above, each operation | work in each process may be an aspect implemented by any of a manufacturing apparatus and an operator. For example, in the case of small-volume production, the embossing process is performed by the manufacturing apparatus, and the operator performs a rounding process and a scale cutting process on the basis of the obtained sheet-shaped exterior material 11 to obtain a predetermined length. It is conceivable that the cylindrical outer covering material 43 is manufactured. Alternatively, in the case of mass production, it can be considered that all processes are performed by a manufacturing apparatus.

  Moreover, in the said embodiment, although it was set as the structure by which a sheet | seat base material shaping | molding process is made in a W / H factory, like the conventional manufacturing method, the sheet | seat base material 75 is manufactured in a dedicated components factory, the said A configuration for transporting the sheet base material 75 may be used.

(Modified example of uneven shape)
Moreover, in the said embodiment, although it was set as the structure by which the recessed part 15 shown in FIGS. 1-3 is formed in the sheet | seat base material 75 in the embossing process and the exterior material 11 is formed, it is formed in the sheet | seat base material 75. The uneven shape is not limited to this. For example, the configuration may be such that the convex portion 65 shown in FIG. 11 is formed and the exterior material 11A is formed. In FIG. 11, a plurality of convex portions 65 formed in the same shape are regularly formed adjacent to each other in the vertical and horizontal directions (X direction and Y direction) on the exterior material 11A. In the illustrated example, the convex portions 65 are arranged in a straight line in two vertical and horizontal directions. As shown in FIG. 11, each convex portion 65 is formed to have a trapezoidal cross-sectional shape in both the Y-direction view and the X-direction view.

  Below, the effect | action and effect of the manufacturing method of the cylindrical exterior material which concern on embodiment, and the manufacturing method of a wire harness are demonstrated.

The manufacturing method of the tubular exterior member according to the embodiment embosses the sheet base material 75 and forms an uneven shape on the base material which is regularly adjacent to each other ((e) in FIG. 8). (A) in FIG. 10) and a rounding step (in FIG. 8) for curving and forming the sheet base material 75 (that is, the exterior material 11) on which the uneven shape has been formed by the embossing step into a cylindrical shape. (F) and (b) in FIG. 10 are included.
For this reason, for example, after manufacturing the sheet base material 75 in the parts factory, the manufactured sheet base material 75 is transported to the W / H factory, and then the cylindrical exterior material 43 is manufactured based on the sheet base material 75. Even in this case, the sheet base material 75 may be transported from the parts factory to the W / H factory. In this case, since the sheet base material 75 can be wound in a layered manner without any gaps, the packing efficiency is improved, thereby improving the transport efficiency. For this reason, physical distribution cost can be reduced and manufacturing cost can be reduced.
Moreover, since the cylindrical exterior material 43 is manufactured based on a sheet-like base material, an extrusion molding machine or the like used in the base material molding process may be a relatively small-scale facility. For this reason, manufacturing cost can be reduced. In addition, since the base material forming process can be realized with a relatively small facility, each process including the sheet base material forming process can be performed in a W / H factory having a smaller site area than conventional ones.

Moreover, the manufacturing method of the cylindrical exterior material which concerns on embodiment is shape | molded by the base material shaping | molding process ((a) in FIG. 8) which shape | molds the sheet-like base material 71 by extrusion molding, and this base material shaping | molding process. The base material 71 is cut in the longitudinal direction to cut out a sheet base 75 having a predetermined width ((b) in FIG. 8), and the sheet is executed before the embossing step. It further includes a base material forming step.
In this way, the long base material 71 formed into a wide sheet shape by extrusion molding in the base material forming process is cut in the longitudinal direction in the cutting process, and a predetermined size corresponding to the required diameter is obtained. Since the sheet base 75 having a width is cut out, the shape of the base material 71 formed by extrusion molding in the base material forming step is not affected by the required diameter of the exterior material. For this reason, the base material 71 can be made common regardless of the required diameter of the exterior material, and the manufacturing cost can be reduced. Moreover, since the cylindrical exterior material 43 of various diameters is manufactured based on the common sheet-like base material in this way, the processing steps are not complicated. For this reason, the extrusion molding machine etc. which are used in the base material molding process may be a relatively small-scale facility. As a result, the manufacturing cost can be reduced. In addition, since the base material forming process can be realized with a relatively small facility, for example, a method for manufacturing a cylindrical exterior material including a sheet base material forming process in a W / H factory having a smaller site area than conventional ones is performed. Can do.

  Moreover, in the manufacturing method of the cylindrical exterior material which concerns on embodiment, the said embossing process WHEREIN: As the said uneven | corrugated shape, the recessed part 15 is formed in the surface of the sheet base material 75, and this recessed part 15 is a pair of planar view V-shape. Each of the polygonal lattice portion 17 formed on the surface of the sheet base material 75 so as to have a ridge-like ridge line 23 and arranged in line symmetry so that the V-shaped opening side faces each other, and the V-shaped ridge line 23 in plan view A trough portion 21 having a pair of inclined fold lines 19 extending from the top to the back side of the sheet base material 75 so as to approach each other and a horizontal fold line 29 connecting the tip ends of these inclined fold lines 19 is provided. .

Moreover, the manufacturing method of the wire harness which concerns on embodiment includes the assembly | attachment process of assembling | attaching the sheet | seat base material 75 shape | molded by the said rounding process to the cylinder shape to the at least 1 covered electric wire 61. FIG.
According to this method for manufacturing a wire harness, the packaging efficiency of the exterior material is improved and the transportation efficiency is improved, so that the distribution cost can be reduced, and thus the manufacturing cost can be reduced.

  The technical scope of the present invention is not limited to the embodiment described above. The above-described embodiments can be accompanied by various modifications and improvements within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 11 ... Exterior material 15 ... Concave part 17 ... Grid part 19 ... Inclined folding line 21 ... Valley part 23 ... Ridge line 27 ... Top part 29 ... Horizontal folding line 31 ... Horizontal ridge line 39 ... Peak part 41 ... Orthogonal line 43 ... Cylindrical exterior material 61 ... Covering Electric wire (electric wire)
71: Base material 75 ... Sheet base material (base material)
W ... Wire harness

Claims (4)

Embossing a sheet-like base material to form an uneven shape on the base material that is regularly arranged adjacent to each other; and
A rounding step of bending the base material on which the uneven shape is formed by the embossing step into a cylindrical shape;
The manufacturing method of the cylindrical exterior material characterized by including. A base material forming step of forming a sheet-like base material by extrusion,
Cutting out the base material having a predetermined width by cutting the base material formed by the base material forming step in the longitudinal direction; and
A sheet base material forming step that is performed before the embossing step.
The manufacturing method of the cylindrical cladding | exterior_material of Claim 1 characterized by the above-mentioned. In the embossing step, as the uneven shape, a recess is formed on the surface of the substrate,
The recess is
A polygonal lattice portion formed on the surface of the base material and arranged symmetrically so as to have a pair of V-shaped ridge lines in plan view and facing the V-shaped opening side;
A trough having a pair of inclined fold lines extending from the top of each V-shaped ridge line in plan view so as to incline toward the back surface side of the base material and approach each other, and a horizontal fold line connecting the tip ends of these inclined fold lines And comprising
The manufacturing method of the cylindrical exterior material in any one of Claim 1 and Claim 2 characterized by the above-mentioned.   The assembly | attachment process of assembling | attaching the said base material shape | molded by the said rounding process in the manufacturing method of the cylindrical cladding | exterior_material of any one of Claims 1-3 to at least 1 electric wire is included. A method of manufacturing a wire harness characterized by the above.

Images