JP2023181863A - Exterior body forming plate material, exterior body, and exterior body-provided wire harness - Google Patents

Abstract

To provide an exterior body forming plate material which can be easily bent to opposite directions so as to form a bent portion without damaging a peripheral member (component), and with which the tensile strength of a portion to be formed into the bent portion can be enhanced, an exterior body using the plate material, and a wire harness provided with the exterior body.SOLUTION: An exterior body forming plate material 1 is formed of a plastically deformable resin material. A first recess 21 and a second recess 31 are disposed at opposed positions in surfaces 2 and 3 on both sides which correspond to bent portions of an exterior body. The cross-sectional shapes of the first recess 21 and the second recess 31 are formed by arcs having respective curvatures at which a pair of recess open end portions 22a and 22b and a recess bottom portion 23 are mutually recessed to opposite directions while a pair of recess open end portions 32a and 32b and a recess bottom portion 33 are mutually recessed to opposite directions. The cross-sectional shapes form smooth curves as a whole.SELECTED DRAWING: Figure 1

Description

The present invention relates to a plate material for forming an exterior body, an exterior body using the same, and a wire harness with an exterior body.

An exterior body is used around the outer periphery of a wire harness that is routed in a vehicle or the like to protect the wire harness from external forces. It is not preferable for such an exterior body to be deformed due to the weight or vibration of the wire harness, or for the object to be protected inside to be exposed, and it is desirable that the exterior body has appropriate strength.

As an exterior body for protecting such a wire harness, for example, Patent Document 1 discloses that the exterior body of a wire harness with an exterior body (protector) is formed of a hollow plate material in which a hollow structure is formed between a plurality of plate-shaped parts. The exterior body is described. Here, the exterior body is described as having an easy-to-bend line such as a perforation line formed along the bendable portion of the hollow plate by a roller having a cutting blade or a protrusion on the surface.

International Publication No. 2015/016056

However, the plate material constituting the exterior body described in Patent Document 1 is designed to be bent in one direction, and easy-to-bend lines such as cuts and perforations formed on the surface may cause breakage due to tearing or the like. There was a risk that mechanical strength such as tensile strength would be lowered in the part that becomes the bent part by being bent.

In addition, in the plate material described in Patent Document 1, the bending angle is likely to fluctuate because the rigidity of the bent portion is low, and there is a risk that the formed exterior body may be easily crushed and the shape of the exterior body may collapse. was there.

Furthermore, in the plate material described in Patent Document 1, the edge formed on the cut surface may appear on the outer surface of the exterior body, thereby causing damage to members (components) located around the exterior body.

The present invention provides an exterior body that can be easily bent in both directions to form a bent part without damaging surrounding members (components), and that can increase the tensile strength of the part that becomes the bent part. The object of the present invention is to provide a forming plate material, an exterior body using the same, and a wire harness with the exterior body.

The present inventors have provided a first recess and a second recess at opposing positions on both sides corresponding to the bent portions of the exterior body, so that the exterior body formation plate material can be easily moved in both directions. I discovered that it can be bent. Further, the cross-sectional shapes of the first recess and the second recess are each formed by an arc having a curvature in which the opening end portion of the pair of recesses and the bottom portion of the recess are convex in opposite directions, and the overall shape is a smooth curve. It was discovered that the tensile strength of the bent portion can be increased by forming the bent portion into a shape, and the present invention was completed based on this finding.

(1) A plate material for forming an exterior body made of a plastically deformable resin material, the plate material having a first recess and a second recess, respectively, at opposing positions on both surfaces corresponding to the bent portion of the exterior body, The cross-sectional shapes of the first recess and the second recess are each formed by a circular arc having a curvature in which a pair of recess opening end portions and a recess bottom portion are convex in opposite directions, and the overall shape is a smooth curve. Board material for forming the exterior body.

(2) When the thickness of the plate material is 100%, the minimum thickness of the thin portion of the plate material where the first recess and the second recess are located is in the range of 10% to 70%. The plate material for forming an exterior body according to (1).

(3) Exterior body formation according to (1) or (2) above, wherein the maximum depth of the first recess is in a range of 25% or more and 85% or less when the thickness of the plate material is 100%. Board material for use.

(4) In any one of (1) to (3) above, the maximum depth of the second recess is in the range of 3% or more and 40% or less when the thickness of the plate material is 100%. The plate material for forming the exterior body described above.

(5) In the first recess and the second recess, when the maximum depth of the first recess is 1.00, the maximum depth of the second recess is 0.04 or more and 1.00 or less. , the plate material for forming an exterior body according to any one of (1) to (4) above.

(6) When forming the bent portion of the exterior body by bending the plate material, the opening end portions of the recess located on the side to be bent inward among the first recess and the second recess are in contact with each other. The plate material for forming an exterior body according to any one of (1) to (5) above, which is in contact with the plate material.

(7) At least one bent portion formed by bending the plate material for forming an exterior body according to any one of (1) to (6) above, and a plurality of plate surface portions that are connected via the bent portion. An exterior body having.

(8) The exterior body according to (7) above, wherein the exterior body is an exterior body for electric wires that is attached to the outer periphery of the electric wire.

(9) A wire harness with an exterior body, comprising the exterior body according to (7) or (8) above.

According to the present invention, it is possible to easily bend in both directions to form a bent portion without damaging surrounding members (components), and it is possible to increase the tensile strength of the portion that will become the bent portion. A plate material for forming an exterior body, an exterior body using the same, and a wire harness with an exterior body can be provided.

FIG. 1 is a schematic front view showing main parts of a plate material for forming an exterior body, including a first recess and a second recess. FIG. 2 is a schematic front view showing the main parts of the plate material for forming the exterior body, including the first recess and the second recess, and FIG. 2(a) shows the state before bending, and FIG. 2(b) shows the state before bending. FIG. 2C shows a state in which one surface of the plate material for forming the exterior body is bent inwardly, and FIG. 2C shows a state in which the plate material for forming the exterior body body is bent inwardly on the other surface. FIG. 3 is a schematic perspective view showing the structure of the electric wire sheath formed by the sheath forming plate material. FIG. 4 is a cross-sectional view including the thickness direction perpendicular to the direction in which the first recess and the second recess extend, in a state before bending, of the plate material for forming the exterior body of Example 2 of the present invention. It is. FIG. 5 shows the positional relationship between the center line and the first recess and the second recess when cutting samples for tensile strength measurement from the plate materials for forming the exterior body of Invention Examples 1 to 3 and Comparative Examples 1 and 2. FIG. FIG. 6 is a graph showing the relationship between the minimum thickness t ₁ [mm] of the thin portion and the tensile strength [N/mm ² ] for the plate materials for forming the exterior body of Invention Examples 1 to 3 and Comparative Examples 1 and 2. The horizontal axis represents the minimum thickness of the thin portion, and the vertical axis represents the tensile strength. FIG. 7 is a diagram for explaining a method for evaluating the bending strength of a plate material for forming an exterior body. FIG. 8 is a graph showing the relationship between the minimum thickness t ₁ [mm] of the thin portion and the bending strength [N] for the plate materials for forming the exterior body of Examples 1 to 3 of the present invention and Comparative Example 1, The horizontal axis is the minimum thickness of the thin part, and the vertical axis is the bending strength. FIG. 9 is a cross-sectional view of the plate material for forming the exterior body of Invention Example 2 after bending, which is perpendicular to the direction in which the first recess and the second recess extend, and includes the thickness direction. It is.

Next, the plate materials for forming an exterior body and the exterior body according to some embodiments of the present invention will be described below.

1. About the plate material for forming the exterior body FIG. 1 is a schematic front view showing the main parts of the plate material 1 for forming the exterior body, including the first recess 21 and the second recess 31. As shown in FIG. Further, FIG. 2 is a schematic front view showing the main parts of the plate material 1 for forming an exterior body, including the first recess 21 and the second recess 31, and FIG. 2A shows the state before bending, and FIG. (b) shows the plate material 1 for forming the exterior body with one surface 2 bent inward, and FIG. 2(c) shows the plate material 1 for forming the exterior body with the other surface 3 bent inward. It is in a state where it is Moreover, FIG. 3 is a schematic perspective view showing the structure of the exterior body 10 for electric wires formed by the plate material 1 for exterior body formation. The "front" here refers to a cross section including the thickness direction, which is perpendicular to the direction in which the first recess 21 and the second recess 31 extend.

As shown in FIG. 1, the plate material 1 for forming the exterior body is made of a plastically deformable resin material, and has a first recess 21 and a first recess 21 at opposing positions on both surfaces 2 and 3 corresponding to the bent portions of the exterior body. The first recess 21 has two recesses 31, and the cross-sectional shape of the first recess 21 is formed by an arc having a curvature in which the pair of recess opening end portions 22a, 22b and the recess bottom portion 23 are convex in opposite directions. The cross-sectional shape of the second recess 31 is formed by a circular arc having a curvature in which the pair of recess opening end portions 32a, 32b and the recess bottom portion 33 are convex in opposite directions, and has a smooth curved shape as a whole. Eggplant. In addition, although the cross-sectional shape of the 1st recessed part 21 and the cross-sectional shape of the 2nd recessed part 31 are each shown left-right symmetrical in FIG. 1, it is not limited to the aspect which is left-right symmetrical.

As a result, the plate material 1 for forming the exterior body has the first recess 21 and the second recess 31 at opposing positions on one surface 2 and the other surface 3, respectively, so that the plate material 1 for forming the exterior body is Since it is possible to easily bend the front surface 2 and the other surface 3 in either direction, the plate material 1 for forming the exterior body can be bent in any direction to form a bent part. Further, the first recess 21 of the plate material 1 for forming an exterior body is formed by a circular arc having a curvature in which the pair of recess opening end portions 22a, 22b and the recess bottom portion 23 are convex in opposite directions, and the entire The second recess 31 of the plate material 1 for forming the exterior body is formed such that the pair of recess opening end portions 32a and 32b and the recess bottom portion 33 are convex in opposite directions. Since it is formed by a circular arc with a curvature of It is possible to increase the mechanical strength of Furthermore, since the plate material 1 for forming the exterior body is formed to have a smooth curved shape as a whole, corners etc. do not appear on the surface of the exterior body, so that members (components) located around the exterior body ) becomes less likely to cause damage. Therefore, by using this plate material 1 for forming the exterior body, it is possible to easily bend in both directions to form a bent part without damaging the surrounding members (components), and it is possible to easily bend the bent part to form a bent part. It is possible to provide a plate material for forming an exterior body that can increase strength, an exterior body using the same, and a wire harness with an exterior body.

Here, "smooth curved shape" means a curved shape without corners. Therefore, the outline of the first recess 21 of the plate material 1 for forming the exterior body is formed to have a curved shape with no corners from the recess opening end portion 22a to the recess opening end portion 22b in the cross section of the first recess 21. be done. Further, the outline of the second recess 31 of the plate material 1 for forming the exterior body is formed to have a curved shape without corners from the recess opening end portion 32a to the recess opening end portion 32b in the cross section of the second recess 31. be done.

(About resin materials)
The plate material 1 for forming the exterior body is made of a plastically deformable resin material.

The resin type of the resin material constituting the plate material 1 for forming the exterior body is preferably a thermoplastic resin, such as polyethylene resin, polypropylene resin, polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyamide resin, polyphenylene sulfide resin, Examples include polystyrene resin, polyvinyl chloride resin, polyvinyl acetate resin, polytetrafluoroethylene resin, and acrylic resin. In particular, it is preferable that the resin material contains polypropylene resin.

Here, it is preferable that the resin material constituting the plate material 1 for forming the exterior body is a foamed resin. This makes it possible to form the first recess 21 and the second recess 31 by partially compressing the plate material made of foamed resin, thereby forming an exterior body having the first recess 21 and the second recess 31. The plate material 1 for use can be produced efficiently. In particular, when the plate material 1 for forming the exterior body is made of foamed resin, the foaming rate (porosity) of the thin walled part where the first recess 21 and the second recessed part 31 are formed is the same as the foaming ratio (porosity) of the part other than the thin walled part. It is preferable that the ratio is lower than the

Here, the density of the foamed resin is not particularly limited, but can be, for example, in the range of 200 kg/m ³ or more and 1000 kg/m ³ or less. In particular, from the viewpoint of reducing the weight of applied products having the plate material 1 for forming an exterior body, such as exterior bodies for electric wires and wire harnesses with exterior bodies, and increasing the buffering effect against mechanical shock, the density of the foamed resin is 1000 kg/ It is preferably at most m ³ , more preferably at most 700 kg/m ³ , even more preferably at most 500 kg/m ³ . On the other hand, the density of the foamed resin may be 200 kg/m ³ or more from the viewpoint of further increasing the mechanical strength of the foamed resin.

On the other hand, the resin material constituting the plate material 1 for forming the exterior body may be a non-foamed resin. It is also possible to form the first recess 21 and the second recess 31 by partially rolling a plate material made of non-foamed resin, and in this case, it is also possible to form the exterior having the first recess 21 and the second recess 31. The body forming plate material 1 can be efficiently produced.

The resin material constituting the plate material 1 for forming the exterior body may contain various additives that are added to ordinary resins depending on the purpose. Examples of additives include fillers, antioxidants, stabilizers, flame retardants, metal deactivators, ultraviolet absorbers, light stabilizers, plasticizers, nucleating agents, compatibilizers, clarifying agents, and antistatic agents. One or more types of agents, lubricants, etc. may be mentioned.

From the viewpoint of making it easier to manufacture, the plate material 1 for forming the exterior body is preferably composed of a single resin plate, but may be composed of a combination of a plurality of resin plates.

(About the first recess and the second recess)
The plate material 1 for forming the exterior body has a first recess 21 and a second recess 31 at opposing positions on both sides corresponding to the bent portions of the exterior body. More specifically, the plate material 1 for forming an exterior body has a first recess 21 on one surface 2 and a second recess 31 on the other surface 3, and these first recess 21 and second recess 31 are provided at opposing positions on one surface 2 and the other surface 3, respectively. This facilitates valley folding with any one of the first recess 21 and the second recess 31 as a valley, so that the exterior body forming plate material 1 can be folded on both the one surface 2 and the other surface 3 sides. Since the plate material 1 for forming the exterior body can be easily bent to any side, a bent portion can be formed.

Here, the cross-sectional shapes of the first recess 21 and the second recess 31 are such that, as shown in FIGS. 1 and 2(a), a pair of recess opening end portions 22a and 22b and a recess bottom portion 23 are formed. The pair of recessed opening end portions 32a, 32b and the recessed bottom portion 33 are formed of circular arcs having curvatures convex in opposite directions, and the whole It forms a smooth curve. As a result, as shown in FIG. 2(b), when the exterior body forming plate material 1 is folded so that one surface 2 faces inward (when the first recess 21 is made into a valley fold), , the paired recess opening end portions 22a and 22b close, and the thin recess bottom portion 23 bends. Similarly, as shown in FIG. 2(c), when the exterior body forming plate material 1 is bent so that the other surface 3 faces inward (when the second recess 31 is made into a valley fold) Then, the paired recess opening end portions 32a and 32b are closed, and the thin recess bottom portion 33 is bent. Here, when forming the bent part of the exterior body by bending the plate material 1 for forming the exterior body, of the first recess 21 and the second recess 31, the recess located on the side to be bent inward is the recess opening end portion 22a. , 22b (or the opening end portions 32a, 32b of the recess) are preferably in contact with each other. When the recess bottom portion 23 or the recess bottom portion 33 is bent, the recess opening end portions 22a, 22b or the recess opening end portions 32a, 32b abut against each other, so that the bending angle is temporarily regulated at that angle, and By applying stronger force to the recess bottom portion 23 or the recess bottom portion 33 in this state and bending the recess bottom portion 23 or the recess bottom portion 33, the recess opening end portions 22a, 22b or the recess opening end portions 32a, 32b can be brought into a collapsed state. As a result, the thin recess bottom portion 23 and the recess bottom portion 33 are bent, thereby plastically deforming the exterior body forming plate material 1, thereby forming a bent portion fixed at a desired bending angle.

In particular, in this plate material 1 for forming an exterior body, the cross-sectional shapes of the first recess 21 and the second recess 31 are formed by circular arcs, and the overall shape is a smooth curve, compared to a case where they are formed with corners. As a result, it is possible to make it difficult for the origin of fracture to occur, so it is also possible to increase the mechanical strength such as the tensile strength of the plate material 1 for forming the exterior body, and since corners etc. do not appear on the surface of the exterior body, Damage to members (components) located around the exterior body can also be made less likely to occur.

Here, the recess bottom portion 23 of the first recess 21 and the recess bottom portion 33 of the second recess 31 are arranged so that the one surface 2 and the other surface 3 Although it is preferable that it be in one position, it may be in a different position on both sides. Further, it is preferable that the recess bottom portion 23 of the first recess 21 and the recess bottom portion 33 of the second recess 31 extend linearly in one direction, but at least partially curved. Good too.

The radius of curvature R ₁₁ of the recess bottom portion 23 of the first recess 21 is preferably in the range of 0.05 mm or more and 0.50 mm or less, and more preferably in the range of 0.08 mm or more and 0.23 mm or less. In particular, from the viewpoint of ease of bending, when the first recess 21 is valley-folded to form a valley and then bent and fixed at an angle of around 90°, which is the most general-purpose bending angle, the bottom part 23 of the recess The radius of curvature R ₁₁ is preferably 0.05 mm or more, more preferably 0.08 mm or more. On the other hand, when the first recess 21 is valley-folded and fixed at an angle of around 90 degrees, which is the most general-purpose bending angle, from the viewpoint of making the bent part sturdy, the bottom of the recess is The radius of curvature R ₁₁ of the portion 23 is preferably 0.50 mm or less, more preferably 0.23 mm or less. Here, the radius of curvature _R11 of the recess bottom portion 23 is the radius of curvature in the cross section of the recess bottom portion 23, that is, the concave surface extending in a range sandwiched between a recess opening end portion 22a and a recess opening end portion 22b, which will be described later. The radius of curvature of the deepest part of the cross section may be within the above range, and does not necessarily have to be a constant value.

Further, the radius of curvature R ₂₁ of the recess bottom portion 33 of the second recess 31 is preferably in the range of 0.05 mm or more and 3.50 mm or less, and more preferably in the range of 0.12 mm or more and 1.50 mm or less. preferable. In particular, from the viewpoint of ease of bending, when the second recess 31 is valley-folded so that it forms a valley and then bent and fixed at an angle of around 90°, which is the most general-purpose bending angle, the bottom part 33 of the recess The radius of curvature R ₂₁ is preferably 0.05 mm or more, more preferably 0.12 mm or more. On the other hand, when the second recess 31 is folded into a valley and fixed at an angle of about 90 degrees, which is the most general-purpose bending angle, from the viewpoint of making the bent part sturdy, the bottom of the recess The radius of curvature R ₂₁ of the portion 33 is preferably 3.50 mm or less, more preferably 1.50 mm or less. Here, the radius of curvature R ₂₁ of the recess bottom portion 33 is the radius of curvature in the cross section of the recess bottom portion 33, that is, the concave surface extending in a range sandwiched between a recess opening end portion 32a and a recess opening end portion 32b, which will be described later. The radius of curvature of the deepest part of the cross section may be within the above range, and does not necessarily have to be a constant value.

The ratio of the radius of curvature R 21 of the bottom portion 23 of the second recess 31 to the radius of curvature R ₁₁ of the bottom portion 23 of the first recess ₂₁ is not particularly limited, but is, for example, 0.9 or more 22. It may be in the range of 0 or less, or may be in the range of 0.9 or more and 6.0 or less.

The radius of curvature R ₁₂ of the recess opening end portions 22a and 22b of the first recess 21 is preferably in the range of 0.3 mm or more and 1.5 mm or less, and preferably in the range of 0.4 mm or more and 0.9 mm or less. It is more preferable. In particular, from the viewpoint of ease of bending when the first recess 21 is folded into a valley and fixed at an angle of around 90°, which is the most general-purpose bending angle, the opening end portion 22a of the recess , _22b are each preferably 0.3 mm or more, and more preferably 0.4 mm or more. On the other hand, when the first recess 21 is folded into a valley and fixed at an angle of about 90 degrees, which is the most general-purpose bending angle, from the viewpoint of making the bent part sturdy, the opening of the recess The radius of curvature R ₁₂ of each of the end portions 22a and 22b is preferably 1.5 mm or less, more preferably 0.9 mm or less. Here, the radius of curvature R ₁₂ of the recess opening end portions 22a and 22b is the cross-sectional area of the entire upwardly convex curved surface extending in the range sandwiched between the recess bottom portion 23 and the end of the first recess 21. The radius of curvature of the surface only needs to be within the above range, and does not necessarily have to be a constant value.

Further, the radius of curvature R ₂₂ of the recess opening end portions 32a and 32b of the second recess 31 is preferably in the range of 0.5 mm or more and 7.5 mm or less, and preferably in the range of 0.6 mm or more and 5.8 mm or less. It is more preferable that In particular, from the viewpoint of ease of folding when the second recess 31 is folded in a valley and fixed at an angle of about 90°, which is the most general-purpose bending angle, the opening end portion 32a of the recess , _32b are each preferably 0.5 mm or more, and more preferably 0.6 mm or more. On the other hand, when the second recess 31 is valley-folded and fixed at an angle of around 90°, which is the most general-purpose bending angle, from the viewpoint of making the bent part sturdy, the recess opening The radius of curvature _R22 of each of the end portions 32a and 32b is preferably 7.5 mm or less, more preferably 5.8 mm or less. Here, the radius of curvature R ₂₂ of the recess opening end portions 32 a and 32 b is the cross-sectional area of the entire downwardly convex curved surface extending in the range sandwiched between the recess bottom portion 33 and the end of the second recess 31 . The radius of curvature of the surface only needs to be within the above range, and does not necessarily have to be a constant value.

The ratio of the average radius of curvature R 22 of the recess opening end portions 32 a, 32 _b of the second recess 31 to the average radius of curvature R ₁₂ of the recess opening end portions 22 a, 22 b of the first recess 21 is not particularly limited. However, for example, it may be in the range of 1.0 or more and 14.5 or less, or may be in the range of 1.2 or more and 9.6 or less.

The maximum depth _d1 of the first recess 21 of the plate material 1 for forming the exterior body is preferably in the range of 25% or more and 85% or less, when the thickness t of the plate material 1 for forming the exterior body is 100%, More preferably, it is in the range of 40% or more and 75% or less. Here, when the first recess 21 is valley-folded and fixed at an angle of about 90 degrees, which is the most general-purpose bending angle, from the viewpoint of making the folded part sturdy, the first The maximum depth _d1 of the recess 21 is preferably 25% or more, more preferably 40% or more, of the thickness t of the plate material 1 for forming the exterior body. In particular, by increasing the maximum depth _d1 , the bending angle when valley folding is made at the first recess 21 can be made smaller. On the other hand, from the viewpoint of ease of bending, when the first recess 21 is folded in a valley so that the first recess 21 becomes a valley and then bent and fixed at an angle of around 90°, which is the most general-purpose bending angle, the first recess 21 The maximum depth _d1 is preferably 85% or less, more preferably 75% or less, of the thickness t of the plate material 1 for forming the exterior body.

Further, the maximum depth _d2 of the second recess 31 is preferably in the range of 3% to 40%, and 5% to 15%, when the thickness t of the plate material 1 for forming the exterior body is 100%. The following ranges are more preferable. Here, when the second concave portion 31 is valley-folded so that it becomes a valley and is bent and fixed at an angle of around 90°, which is the most general-purpose bending angle, from the viewpoint of making the folded part sturdy, the second The maximum depth _d2 of the recess 31 is preferably 3% or more, more preferably 5% or more, of the thickness t of the plate material 1 for forming the exterior body. In particular, by increasing the maximum depth _d2 , the bending angle when valley folding is made at the second recess 31 can be made smaller. On the other hand, from the viewpoint of ease of bending, when the second recess 31 is folded in a valley so that the second recess 31 becomes a valley and then bent and fixed at an angle of around 90°, which is the most general-purpose bending angle, the second recess 31 The maximum depth _d2 is preferably 40% or less, more preferably 15% or less, of the thickness t of the plate material 1 for forming the exterior body.

At this time, when the thickness t of the exterior body forming plate material 1 is 100%, the thin part of the exterior body forming plate material 1 where the first recess 21 and the second recess 31 are located. The minimum thickness _t1 is determined by the ease of valley folding (easiness of folding) when valley folding is performed so that the first recess 21 or the second recess 31 becomes a valley, and the mechanical strength of the part to be folded by valley folding. From the viewpoint of simultaneously ensuring the above, the range is preferably 10% or more and 70% or less, and more preferably the range 20% or more and 45% or less. In particular, from the viewpoint of increasing the mechanical strength of the folded portion when the first recess 21 or the second recess 31 is valley-folded, the minimum thickness t ₁ of the thin portion is the outer body forming plate material 1 The thickness t is preferably 10% or more, more preferably 20% or more. On the other hand, when valley folding is performed so that the first recess 21 or the second recess 31 becomes a valley, from the viewpoint of facilitating the valley fold, the minimum thickness t ₁ of the thin portion is The thickness is preferably 70% or less, more preferably 45% or less with respect to the thickness t.

In this specification, the thickness t of the plate material 1 for forming the exterior body is the thickness of the plate surface portion 13, which is the portion of the plate material 1 for forming the exterior body in which the first recess 21 and the second recess 31 are not formed. refers to

The first recess 21 and the second recess 31 have a maximum depth d ₂ of the second recess 31 of 0.04 or more and 1.00 or less, when the maximum depth d ₁ of the first recess 21 is 1.00. It is preferably 0.04 or more and 0.85 or less, and even more preferably 0.10 or more and 0.45 or less. In particular, the plate material 1 for forming the exterior body can be folded not only with the first recess 21 as a valley but also with the second recess 31 as a valley, and furthermore, the plate material 1 for forming the exterior body can be folded in any direction. From the viewpoint of making it easy to bend in the direction, the ratio of the maximum depth _d2 of the second recess 31 to the maximum depth _d1 of the first recess 21 is preferably 0.04 or more, and 0.10 or more. More preferred. On the other hand, the upper limit of the ratio of the maximum depth d ₂ of the second recess 31 to the maximum depth d ₁ of the first recess 21 is set such that the plate material 1 for forming the exterior body is made such that one surface 2 in particular faces inward. From the viewpoint of making it easier to bend, it is preferably 0.85 or less, more preferably 0.45 or less, but from the viewpoint of making it easier to bend the plate material 1 for forming the exterior body in both directions, it may be set to 1.00.

The thickness dimension t of the plate material 1 for forming the exterior body is not particularly limited, but for example, from the viewpoint of easily bending to form a bent part and improving the balance between mechanical strength such as tensile strength, etc. A range of 0.5 mm or more and 5.0 mm or less is preferable, and a range of 1.0 mm or more and 2.0 mm or less is particularly preferable.

2. Regarding the Exterior Body The above-mentioned exterior body forming plate material 1 can constitute the electric wire sheath 10 that is attached to the outer periphery of the electric wire 4 as the exterior body 11 .

This will be explained in detail below using figures. FIG. 3 is a schematic perspective view showing the structure of the exterior body 11. This exterior body 11 has at least one bent portion 12a to 12d formed by bending the aforementioned exterior body forming plate material 1, and a plurality of plate surface portions 13a to 13e that are connected via the bent portions 12a to 12d. . Here, the exterior body 11 includes a plurality of plate surface portions 13a to 13e existing along the extending direction X of the electric wire 4, is formed surrounded by the plate surface portions 13a to 13e, and accommodates the electric wire 4. It has a accommodating part S. In this way, since the exterior body 11 is made of the above-mentioned exterior body forming plate material 1, the exterior body forming plate material 1 can be bent in both directions to easily form the bent portion of the exterior body 11. Since parts and the like do not appear on the surface of the exterior body 11, it becomes difficult to damage members (components) located around the exterior body 11, so while improving workability when forming the exterior body 11, The electric wire 4 and surrounding members (components) can be appropriately protected by the exterior body 11. In addition, in FIG. 3, the electric wire 4 is shown as a single cylindrical shape, but the electric wire 4 may be a bundle of two or more electric wires, such as a wire harness, or may be branched as necessary. It may be something like that.

As shown in FIG. 3, the exterior body 11 forms a housing portion S for accommodating the electric wire 4 by bending the exterior body forming plate material 1 at a plurality of bending portions 12a to 12d. At this time, from the viewpoint of protecting the electric wire 4, it is preferable that the exterior body 11 is configured so that the entire circumference of the electric wire 4 is surrounded by the plate material 1 for forming the exterior body. On the other hand, the exterior body 11 may be configured to partially surround the electric wire 4 since the bent portions 12a to 12d are difficult to deform. At this time, the cross-sectional shape of the exterior body 11 can be an open cross-sectional shape, for example, a U-shape or an L-shape.

Moreover, the exterior body 11 can be formed by bending one sheet of the exterior body forming plate material 1, thereby making it possible to manufacture the exterior body 11 more efficiently.

In addition, the exterior body 11 may be fixed by wrapping a portion of the exterior body forming plate material 1 in a valley-fold manner with the first recess 21 or the second recess 31 as a valley (not shown) or the like. On the other hand, after the plate material 1 for forming the exterior body 11 is folded in a valley fold with the first recess 21 or the second recess 31 as a valley, when the bending force is released, it returns to its original state. The bent portion may open due to the force acting on it, but fixing with tape or the like is not necessarily required.

3. Regarding Wire Harness with Exterior Body The above-mentioned exterior body 11 can constitute a wire harness with an exterior body provided with the exterior body 11. Here, the wire harness with an exterior body includes a wire harness 40 constituted by the electric wires 4 and the above-mentioned exterior body 11, and the exterior body 11 is attached to the outer periphery of one or more electric wires 4. It is something. As a result, at least a portion of the wire bundle constituting the wire harness 40 or the wire assembly consisting of a plurality of divided wire bundles that further branch from the wire bundle and extend can be protected by the exterior body 11.

4. Regarding the manufacturing method of the plate material for forming the exterior body The method for manufacturing the plate material 1 for forming the exterior body is not particularly limited, and examples thereof include punching using a Thomson die, compression processing using a press, and the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all aspects included in the concept of the present invention and the scope of the claims. It can be modified to .

Next, in order to further clarify the effects of the present invention, examples of the present invention will be described, but the present invention is not limited to these examples.

[1] Production of plate material for forming the exterior body [Invention Examples 1 to 3]
A foamed resin board made of foamed polypropylene resin with a density of 480 kg/m ³ and a thickness t of 1.5 mm was used. By punching this foamed resin board using a Thomson die consisting of a full cutting blade and a push-rule blade, the first recess 21 and the second recess 31 are formed at opposing positions on both sides, and the exterior A plate material 1 for body formation was obtained.

When the obtained plate material 1 for forming an exterior body was observed in a cross section including the thickness direction perpendicular to the direction in which the first recess 21 and the second recess 31 extend, the result was as shown in FIG. . More specifically, the obtained plate material 1 for forming an exterior body has a pair of recess opening end portions 22a, 22b and a recess bottom portion 23 formed into circular arcs having curvatures convex in opposite directions, The pair of recess opening end portions 32a, 32b and the recess bottom portion 33 are formed by circular arcs having curvatures convex in opposite directions, and the entirety of both surfaces forms a smooth curved shape.

[Comparative example 1]
Using the same foamed resin board as that used in Examples 1 to 3 of the present invention, a punching process was performed in which cuts were made up to half the sheet thickness using a cutting blade instead of the first recess 21 and the second recess 31. An easy-to-bend line consisting of a cut with a depth of 0.75 mm was formed to obtain a plate material for forming an exterior body.

[Comparative example 2]
Using the same foamed resin board as that used in Examples 1 to 3 of the present invention, the first recess 21 and the second recess 31 were not formed, and the board was used as a board for forming an exterior body.

[2] Shape of the plate material for forming the exterior body Regarding the shape of the obtained plate material 1 for forming the exterior body, the radius of curvature of the recess bottom portion 23 of the first recess 21 is R ₁₁ [mm], and the recess opening end portion of the first recess 21 is 22a, 22b radius of curvature R ₁₂ and its average value [mm], radius of curvature R ₂₁ [mm] of the recess bottom portion 33 of the second recess 31, radius of curvature R of the recess opening end portions 32a, 32b of the second recess 31 ₂₂ and its average value [mm], the maximum depth d ₁ [mm] of the first recess 21, the maximum depth d ₂ [mm] of the second recess 31, and the minimum thickness t ₁ [mm] of the thin portion are: It was as shown in Table 1. Also, the ratio of the radius of curvature R ₂₁ to the radius of curvature R ₁₁ , the ratio of the average radius of curvature R ₂₂ to the average of the radius of curvature R ₁₂ , and the ratio of the maximum depth d ₂ to the maximum depth d ₁ , which are determined from these values. were as shown in Table 1. In addition, each numerical value regarding the shape of the obtained plate material 1 for forming the exterior body is based on the minimum thickness t of the thin part of the plate material ₁ for forming the exterior body, and the thickness t of the plate material 1 for forming the exterior body is 100%. Sometimes, 50 samples with a range of 10% to 70% are randomly selected, each numerical value is measured on each of these samples, and the average value of the measured values obtained for each measurement location is calculated as the respective value. did.

[3] Measurement of tensile strength of the plate material for forming the exterior body For the obtained plate material 1 for forming the exterior body, the tensile strength of the portion where the first recess 21 and the second recess 31 are formed was measured in accordance with JIS K6251. did. More specifically, the test is carried out from the plate material 1 for forming the exterior body so that the direction perpendicular to the bottom portions 23 and 33 of the first recess 21 and the second recess 31 is the extending direction of the central axis 51. Piece 5, the dumbbell-shaped test piece No. 3, was cut out, and the tensile strength [N/mm ² ] was measured. The tensile strength was measured five times, and the average value of the five measurements was taken as the measured value of the tensile strength. The results are shown in Table 1.

Furthermore, a graph showing the relationship between the minimum thickness t ₁ [mm] of the thin portion and the tensile strength [N/mm ² ] for the plate materials for forming the exterior body of Examples 1 to 3 of the present invention and Comparative Examples 1 and 2 is shown. 6. The graph in FIG. 6 has the horizontal axis representing the minimum thickness of the thin portion and the vertical axis representing the tensile strength.

[4] Measurement of the bending strength of the plate material for forming the exterior body The bending strength of the plate material 1 for forming the exterior body was measured in the arrangement shown in FIG. 7 for the plate material 1 for forming the exterior body obtained. More specifically, a jig J ₂ is used to measure the range from a distance L ₁ on one side of the plate material 1 for forming the exterior body from the bottom part 33 of the second recess 31 to one end. At the same time, the jig _J1 attached to the head of the tensile tester is vertically lowered from above at a distance _L2 from the bottom part 33 of the second recess 31 to the other side. When the plate material 1 for forming the exterior body is bent so that the other surface 3 faces inward (when the second recess 31 is made into a valley fold), the maximum value of the load F is measured, and the value is calculated. The bending strength was defined as [N]. Here, the dimension along the extending direction of the first recess 21 and the second recess 31 of the plate material 1 for forming the exterior body was 30 mm. Further, the distance _L1 was 1 mm, and the distance _L2 was 10 mm. The bending strength was measured five times, and the average value of the five measurements was taken as the measured value of the bending strength. The results are shown in Table 1.

Further, FIG. 8 shows a graph showing the relationship between the minimum thickness t ₁ [mm] of the thin portion and the bending strength [N] for the plate materials for forming the exterior body of Examples 1 to 3 of the present invention and Comparative Example 1. In the graph of FIG. 8, the horizontal axis represents the minimum thickness of the thin portion, and the vertical axis represents the bending strength.

From the evaluation results in Table 1, it can be seen that the plate materials for forming the exterior body of Examples 1 to 3 of the present invention, in which the first recess 21 and the second recess 31 were formed at opposing positions on both sides, had a tensile strength of 15 [N/mm]. ² ] or more was confirmed. In addition, the plate materials for forming the exterior body of Examples 1 to 3 of the present invention have a measured bending strength of 20 [N] or less, and can be easily bent at the locations where the first recess 21 and the second recess 31 are formed. It was confirmed that it can be bent. In particular, it was confirmed from the graph in FIG. 8 that the plate materials for forming the exterior body of Examples 1 to 3 of the present invention had a measured bending strength of 20 [N] or less.

On the other hand, in the plate material for forming the exterior body of Comparative Example 1, when easy bending lines consisting of notches were formed instead of the first recess 21 and the second recess 31, the measured value of the tensile strength was 10 [N/mm]. ² ]. The graph of FIG. 6 also shows that the measured tensile strength of the plate material for forming the exterior body in Comparative Example 1 is significantly lower than the measured tensile strength of Inventive Examples 1 to 3. In this regard, in Comparative Example 1, the cross-sectional area of the cross section perpendicular to the tensile direction at the position of the score line formed as the easy-to-bend line was approximately 50% of the cross-sectional area at other positions where the score line was not formed. Furthermore, it is thought that the tensile strength decreased because the tip of the cut, that is, the deepest part of the cut, created a notch effect and was more likely to be torn.

In addition, in Comparative Example 2, when the plate material for forming the exterior body was used as it was without forming the first recess 21 and the second recess 31, it could not be bent at the position where it was intended to be bent. It was not possible to measure comparable bending strengths.

Furthermore, the plate material 1 for forming an exterior body obtained under the same conditions as in Invention Example 2 is bent so that the other surface 3 faces inward by making the second recess 31 into a valley and making it a valley fold. Ta. When the plate material 1 for forming the exterior body after bending was observed in a cross section including the thickness direction perpendicular to the direction in which the first recess 21 and the second recess 31 extend, as shown in FIG. It was possible to bend the first recess 21 and the second recess 31 at the bent portions without destroying them.

Therefore, the plate materials for forming the exterior body of Examples 1 to 3 of the present invention can be easily bent in both directions to form a bent part without damaging surrounding members (components). It was possible to increase the tensile strength of the part.

On the other hand, the plate material of Comparative Example 1 has a small cross-sectional area perpendicular to the tensile direction at the position of the cut line formed on the surface of the part that becomes the bent part, and furthermore, due to the notch effect at the tip of the cut, Since it was easily torn, the tensile strength of the bent portion was low. Further, since the plate material of Comparative Example 2 did not have the first recess and the second recess, it was difficult to bend the plate material to form a bent portion.

1 Sheathing body forming plate material 10 Wire sheathing body 11 Exterior body 12a to 12d Bent parts 13, 13a to 13e Plate surface portion 2 One surface of the sheathing body forming plate material 21 First recessed part 22a, 22b Recessed opening end of the first recessed part Part 23 Bottom portion of the first recess 3 Other surface of the plate material for forming the exterior body 31 Second recess 32a, 32b Open end portion of the second recess 33 Bottom portion of the second recess 4 Electric wire 40 Wire harness d _1st 1 Maximum depth of the recess d ₂ Maximum depth of the second recess R ₁₁ Radius of curvature of the bottom of the first recess R ₁₂ Radius of curvature of the opening end of the first recess R ₂₁ Radius of curvature of the bottom of the second recess Radius of curvature R ₂₂ Radius of curvature of the opening end of the second recess t ₁ Minimum thickness of the thin part of the plate material for forming the exterior body

Claims (9)

A plate material for forming an exterior body made of a plastically deformable resin material,
The plate material has a first recess and a second recess, respectively, at opposing positions on both surfaces corresponding to the bent portion of the exterior body,
The cross-sectional shapes of the first recess and the second recess are each formed by a circular arc having a curvature in which a pair of recess opening end portions and a recess bottom portion are convex in opposite directions, and the overall shape is a smooth curve. Board material for forming the exterior body. According to claim 1, when the thickness of the plate material is 100%, the minimum thickness of the thin portion of the plate material where the first recess and the second recess are located is in the range of 10% to 70%. The plate material for forming the exterior body described above. The plate material for forming an exterior body according to claim 1, wherein the maximum depth of the first recess is in a range of 25% or more and 85% or less when the thickness of the plate material is 100%. The plate material for forming an exterior body according to claim 1, wherein the maximum depth of the second recess is in a range of 3% or more and 40% or less when the thickness of the plate material is 100%. In the first recess and the second recess, when the maximum depth of the first recess is 1.00, the maximum depth of the second recess is 0.04 or more and 1.00 or less. 1. The plate material for forming an exterior body according to 1. When the bent portion of the exterior body is formed by bending the plate material, the opening end portions of the recessed portions of the first recessed portion and the second recessed portion located on the side to be bent inward are in contact with each other. The plate material for forming an exterior body according to claim 1. at least one bent portion formed by bending the plate material for forming an exterior body according to any one of claims 1 to 6;
An exterior body including a plurality of plate surface portions that are connected via the bent portion. The exterior body according to claim 7, wherein the exterior body is an electric wire exterior body attached to the outer periphery of the electric wire. A wire harness with an exterior body, comprising the exterior body according to claim 7.

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