WO2021124871A1

WO2021124871A1 - Vehicle opening/closing body and method for manufacturing same

Info

Publication number: WO2021124871A1
Application number: PCT/JP2020/044717
Authority: WO
Inventors: 倫之吉田; 義博津田; 太希枝元
Original assignee: 昭和電工マテリアルズ株式会社
Priority date: 2019-12-17
Filing date: 2020-12-01
Publication date: 2021-06-24
Also published as: JP7272466B2; JPWO2021124871A1

Abstract

Provided is a vehicle opening/closing body including at least a lock portion and containing a thermoplastic resin, wherein a fiber resin layer containing fibers and a resin is provided in a region including the lock portion.

Description

Manufacturing method of opening / closing body for vehicles and opening / closing body for vehicles

This disclosure relates to a vehicle opening / closing body and a method for manufacturing a vehicle opening / closing body.

In recent years, weight reduction of automobile parts has been required for the purpose of improving the fuel efficiency of automobiles and reducing the environmental load. In order to meet this demand, there are an increasing number of cases where the material of parts is changed from metal to resin. For example, resinification is widespread in members constituting a vehicle opening / closing mechanism such as a back door installed at the rear of an automobile.

Resin members have higher specific rigidity than steel sheet products (that is, they are lighter when comparing steel sheet products and bending rigidity), and it is relatively easy to form complex shapes that are difficult to sheet metal with steel sheet products, and the product cost is low. Although it is expensive, it has advantages such as being suitable for small-quantity products because the mold cost is low. On the other hand, since resin has a lower rigidity than a steel sheet, a technique for suppressing deformation due to the low rigidity is being promoted.

For example, a resin back door is generally held toward the vehicle body by a hinge installed at the upper part and a lock set at the center of the lower part, and is held and opened / closed on both sides when the back door is opened. A damper is set to assist the operation of the time. Since the mounting position of the damper and the mounting position of the hinge are set apart from each other, the force of the damper is applied to the back door, and the back door may be easily deformed.

As a method of suppressing the above deformation while making the back door made of resin, for example, in Patent Document 1, a resin outer panel and a resin inner panel are formed by laminating, and the inside of a portion where a hinge of the inner panel is attached. Also disclosed are back doors for automobiles, in which reinforcing metal plates are arranged inside the locations where the dampers of the inner panels are attached.

Patent Document 1: Japanese Unexamined Patent Publication No. 2015-39996

Vehicle opening / closing bodies containing thermoplastic resin have advantages such as being lighter in weight and being able to easily form complicated shapes than steel plate products. On the other hand, a vehicle opening / closing body containing a thermoplastic resin has a problem that it is liable to be deformed or broken due to its low rigidity. In particular, in a vehicle opening / closing body having a lock portion and containing a thermoplastic resin, stress due to deformation or the like is likely to be concentrated on the lock portion, and it is required to prevent cracks and breakage in the lock portion. However, from the viewpoint of weight reduction of automobile parts, it is desirable to minimize the use of metal members such as reinforcing metal plates for use in reinforcement.

In view of the above circumstances, it is an object of the present disclosure to provide a vehicle opening / closing body and a method for manufacturing a vehicle opening / closing body that achieves both a reduction in mass of the entire vehicle opening / closing body and an improvement in strength at a lock portion.

The means for solving the above problems include the following embodiments.

<1>
A vehicle opening / closing body having at least a lock portion and containing a thermoplastic resin.
A vehicle opening / closing body having a fiber resin layer containing fibers and a resin in a region including the lock portion.
<2>
The vehicle opening / closing body according to <1>, wherein the fiber is an inorganic fiber.
<3>
The vehicle opening / closing body according to <2>, wherein the fiber is glass fiber.
<4>
The vehicle opening / closing body according to any one of <1> to <3>, wherein the fiber is a continuous fiber woven fabric.
<5>
The vehicle opening / closing body according to any one of <1> to <4>, wherein the vehicle opening / closing body is a back door.
<6>
Equipped with an inner panel and an outer panel,
The vehicle opening / closing body according to any one of <1> to <5>, which has the fiber resin layer in the region including the lock portion of the inner panel.
<7>
The vehicle opening / closing body according to any one of <1> to <6>, wherein the fiber resin layer and the thermoplastic resin are held on a surface.
<8>
The fiber resin layer is described in any one of <1> to <7>, which is a layer integrated with the thermoplastic resin by insert molding of a fiber reinforced resin sheet containing the fiber and the resin. Opening and closing body for vehicles.
<9>
The vehicle opening / closing body according to any one of <1> to <8>, wherein the fiber resin layer is a preliminary shaped body of a fiber reinforced resin sheet containing the fiber and the resin.
<10>
The method for manufacturing a vehicle opening / closing body according to any one of <7> to <9>.
To install a fiber reinforced resin sheet containing the fiber and the resin in the mold,
Molding the thermoplastic resin in the mold on which the fiber reinforced resin sheet is installed,
A method for manufacturing an opening / closing body for a vehicle including.
<11>
The method for manufacturing a vehicle opening / closing body according to <10>, wherein the fiber-reinforced resin sheet installed in the mold is preheated.

According to the present disclosure, there is provided a method for manufacturing a vehicle opening / closing body and a vehicle opening / closing body that achieves both a reduction in mass of the entire vehicle opening / closing body and an improvement in strength at a lock portion.

It is a schematic diagram which shows an example of the state which the upper end of the back door for an automobile is held in the rear part of an automobile. It is a schematic diagram which shows the surface of the inner panel shown in FIG. 1 on the outer panel side. It is an enlarged schematic view around the lock part of the bottom wall in the inner panel shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG.

Hereinafter, the mode for implementing the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiments. In the following embodiments, the components (including element steps and the like) are not essential unless otherwise specified. The same applies to the numerical values and their ranges, and does not limit this disclosure.

In the present specification, the term "process" includes not only a process independent of other processes but also the process if the purpose of the process is achieved even if the process cannot be clearly distinguished from the other process. Is done.
In the numerical range indicated by using "-" in the present specification, the numerical values before and after "-" are included as the minimum value and the maximum value, respectively.
In the numerical range described stepwise in the present specification, the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described stepwise. Good. Further, in the numerical range described in the present specification, the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
In the present specification, each component may contain a plurality of applicable substances. When a plurality of substances corresponding to each component are present in the composition, the content of each component means the total content of the plurality of substances present in the composition unless otherwise specified.
In the present specification, the term "layer" refers to the case where the layer is formed in the entire region when the region is observed, and the case where the layer is formed only in a part of the region. Is also included.
When the embodiment is described in the present specification with reference to the drawings, the configuration of the embodiment is not limited to the configuration shown in the drawings. Further, the size of the members in each figure is conceptual, and the relative relationship between the sizes of the members is not limited to this.

[Vehicle closure]
The vehicle opening / closing body according to the embodiment of the present disclosure is a vehicle opening / closing body having at least a lock portion and containing a thermoplastic resin. Then, a fiber resin layer containing the fiber and the resin is provided in the region including the lock portion.
The vehicle opening / closing body according to an embodiment of the present disclosure may be a vehicle opening / closing body including an inner panel and an outer panel, and having the fiber resin layer in a region including the lock portion in the inner panel. Good.
Here, the vehicle opening / closing body is a member that is attached to a vehicle body such as an automobile and opens / closes among the members constituting the vehicle. Examples of the opening / closing body for vehicles having a lock portion include automobile doors such as back doors and side doors, bonnets, trunk lids, sunroofs, fuel lid covers, and the like.
Hereinafter, a back door for an automobile will be described as an example of a vehicle opening / closing body having a lock portion, but the present invention is not limited to this.

<Backdoor>
The automobile back door according to the present embodiment is a door arranged at the rear portion of the vehicle body of the automobile, and is held at the rear portion of the vehicle body in a state where it can be opened and closed by using a hinge, for example.
FIG. 1 is a schematic view showing an example of a state in which the upper end of a back door for an automobile is held at the rear part of the automobile. The back door 2 shown in FIG. 1 is configured by laminating and integrating the edge portion of the outer panel 3 containing the thermoplastic resin and the edge portion of the inner panel 4 containing the thermoplastic resin.
Here, the outer panel refers to a member that becomes the exterior of an automobile in the configuration of the back door, and the inner panel refers to a member that becomes the interior of the automobile in the configuration of the back door.

A hinge 8 is attached to the upper portion of the side wall 13 of the inner panel 4, and a damper 10 is attached to the central portion. The upper end of the back door 2 is held by the hinge 8 and the damper 10 at the upper end of the rear portion of the vehicle body 1 so that the lower end of the back door 2 can be opened and closed around the upper end of the back door 2.
Further, a lock portion 5 is provided on the bottom wall 14 of the inner panel 4. When the back door 2 is closed, the bottom wall 14 of the back door 2 is held at the lower end of the rear portion of the vehicle body 1 by a lock mechanism (not shown) provided in the lock portion 5.
Hereinafter, each of the inner panel 4 and the outer panel 3 will be described.

-Inner panel-
FIG. 2 is a schematic view showing a surface of the inner panel 4 on the outer panel 3 side. An opening 12 for installing a window is provided on the upper side of the central portion of the inner panel 4. The edge 6 of the inner panel 4 and the edge 9 of the opening 12 have an adhesive surface with the edge of the outer panel 3 (not shown) and the edge of the opening in the outer panel 3 (not shown), respectively. It has become.
The central portion of the inner panel 4 excluding the edge portion 6 and the edge portion 9 has a convex shape on the opposite side to the outer panel 3 and a concave shape on the outer panel 3 side. As a result, the inner panel 4 has a side wall 13 and a bottom wall 14, and a space portion (not shown) is formed between the inner panel 4 and the outer panel 3.
A hinge mounting portion 17 for mounting the hinge 8 is provided on the upper portion of the side wall 13, and a damper mounting portion 16 for mounting the damper 10 is provided on the central portion of the side wall 13. Further, a lock portion 5 for attaching a lock mechanism is provided at the central portion of the bottom wall 14.

FIG. 3 is an enlarged schematic view of the periphery of the lock portion 5 of the bottom wall 14 of the inner panel 4, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 3 and 4, a lock hole 5A is provided in the lock portion 5 at the center of the bottom wall 14. The bottom wall 14 has a fiber resin layer 18 on the inner surface side (that is, the outer panel 3 side) of the inner panel 4 around the lock hole 5A.
In the lock portion 5, the fiber resin layer 18 is provided so as to be in contact with the lock hole 5A and surround the lock hole 5A, but the present invention is not limited to this, and the fiber resin layer 18 is not in contact with the lock hole 5A. It may be provided so as to surround the lock hole 5A in the state. Hereinafter, the region having the fiber resin layer 18 is also referred to as a “fiber resin region”. As shown in FIG. 4, the regions other than the outer surface side of the inner panel 4 (that is, the side opposite to the outer panel 3) and the fibrous resin region of the bottom wall 14 in the fibrous resin region of the bottom wall 14 are thermoplastic resins. It is a thermoplastic resin layer 20 composed of.

Since the back door 2 has the fiber resin layer 18 in the lock portion 5 of the inner panel 4, the strength of the lock portion 5 is improved as compared with the case where the back door 2 does not have the fiber resin layer 18. Further, the back door 2 having the fiber resin layer 18 on the lock portion 5 of the inner panel 4 has a strength in the lock portion 5 while reducing the mass of the entire back door as compared with the back door in which the lock portion 5 is reinforced with a metal member. Is high.
When the lock portion 5 is reinforced with a metal member, the metal member is usually held by the lock portion 5 by using a bolt or the like, so that the metal member is held by the lock portion at the "point" where the bolt exists. On the other hand, in the inner panel 4 having the fiber resin layer 18 in the lock portion 5, the fiber resin layer 18 and the thermoplastic resin layer 20 are integrated on the surface. That is, the fiber resin layer 18 and the thermoplastic resin layer 20 are held by surfaces rather than points or lines. Therefore, the strength transmission is better than when reinforced with a metal member, and further strength improvement is realized. In particular, since the lock portion 5 is likely to be subjected to tensile stress in addition to stress due to deformation, the fibrous resin layer 18 and the thermoplastic resin layer 20 are surface-integrated to obtain durability against those stresses. Therefore, the strength of the lock portion 5 is further improved.

The size of the fibrous resin region may include at least the lock portion 5, and is not particularly limited. The larger the fibrous resin region, the higher the strength of the lock portion 5, while the cost of the material used for forming the fibrous resin layer 18 increases. Therefore, from the viewpoint of low cost, the fibrous resin region is preferably small. The fiber size resin region of the locking portion 5, from the viewpoint of compatibility between strength increase and cost of the lock portion 5 ^is preferably 200 cm 2 ~ 3000 cm ^{^2,} more preferably ^{^{500cm 2 ~ 2800cm 2, 800cm 2}} ~ 2500cm 2 Is even more preferable. Here, the "size of the fiber resin region" means the area of the main surface of the fiber resin layer.
The fiber resin region in the lock portion 5 may be a region having a plurality of fiber resin layers 18. When the fibrous resin region has a plurality of fibrous resin layers 18, the size of the fibrous resin region means the total area of each main surface of the plurality of fibrous resin layers 18.

The thickness of the fiber resin layer 18 is not particularly limited, and examples thereof include a range of 0.1 mm to 6 mm, preferably a range of 0.3 mm to 2 mm from the viewpoint of formability, preferably 0.5 mm to 1 mm. The range is more preferred.
From the viewpoint of moldability, the thickness of the fiber resin layer 18 is preferably 5% to 40%, more preferably 10% to 30%, based on the thickness of the entire bottom wall 14 of the lock portion 5. It is more preferably 15% to 25%. The thickness of the entire bottom wall 14 of the lock portion 5 means the total thickness of the fiber resin layer 18 and the thermoplastic resin layer 20.

The fiber resin layer 18 is a layer containing fibers and a resin.
Examples of the fiber material contained in the fiber resin layer 18 include inorganic fibers such as glass fibers, carbon fibers, metal fibers and ceramic fibers; and organic fibers such as aramid fibers and cellulose fibers. From the viewpoint of improving strength, the fiber material is preferably inorganic fiber, more preferably glass fiber, carbon fiber, and metal fiber among the inorganic fibers, and further preferably glass fiber.

Examples of the type of fiber include single fiber, long fiber, continuous fiber and the like, and among these, continuous fiber is preferable from the viewpoint of improving strength. Here, the continuous fiber is a fiber that is continuous from one end to the other end of the fiber resin layer 18. For example, when the fiber resin layer 18 is formed by using the fiber reinforced resin sheet as described later, the fiber resin layer containing the continuous fibers is formed by using the fiber reinforced resin sheet containing the continuous fibers. That is, by using a fiber-reinforced resin sheet containing fibers continuous from one end to the other end, a fiber resin layer containing fibers continuous from one end to the other end is formed. When a plurality of fiber resin layers 18 are included in the fiber resin region, it is preferable that all the fiber resin layers 18 contain continuous fibers.

Examples of the form of the fiber include non-woven fabric, UD material (Uni Direction material) aligned in one direction, woven fabric, and the like, and among these, woven fabric is preferable from the viewpoint of improving strength. By using the fibers contained in the fiber resin layer 18 as the woven fabric, the strength of the lock portion 5 can be improved even if the fiber resin region is made smaller. In particular, since the lock portion 5 is likely to be subjected to stress from all directions such as stress due to deformation and tensile stress, the fiber may be a continuous fiber woven fabric from the viewpoint of obtaining durability against these stresses. preferable.

Examples of the type of resin contained in the fiber resin layer 18 include polyolefins such as polyethylene and polypropylene, thermoplastic resins such as polycarbonate, polyester, polyamide, polyvinyl chloride, polyurethane and acrylic resin; epoxy resin, oxazine resin and bismaleimide resin. Examples thereof include thermosetting resins such as phenol resins, unsaturated polyester resins, and silicone resins. Among these, the type of resin contained in the fiber resin layer 18 is preferably a thermoplastic resin, more preferably polyolefin, and even more preferably polypropylene, from the viewpoint of adhesiveness to the thermoplastic resin layer 20.
The resin contained in the fiber resin layer 18 is preferably a resin of the same type as the thermoplastic resin contained in the thermoplastic resin layer 20 from the viewpoint of adhesiveness to the thermoplastic resin layer 20. Here, the same type means that the main skeleton of the resin is the same, and specific examples of the same type of resin include polypropylenes and the like.

The fiber resin layer 18 may be formed by using, for example, a fiber reinforced resin sheet containing the above fibers and the above resin. As will be described later, the inner panel 4 may be, for example, an insert molded body manufactured by insert molding using a fiber reinforced resin sheet as an insert member. That is, the fiber resin layer 18 may be a layer integrated with the thermoplastic resin 20 by insert molding of a fiber reinforced resin sheet containing the fibers and the resin.
As shown in FIG. 3, when the lock portion 5 has a step and the fiber resin layer 18 is separated by the step, the fiber resin layer 18 is formed by using a preformed fiber reinforced resin sheet. May be good. That is, the fiber resin layer 18 may be a preliminary shaped body of the fiber reinforced resin sheet containing the fiber and the resin.

Examples of the type of thermoplastic resin contained in the thermoplastic resin layer 20 include those exemplified as the thermoplastic resin contained in the fibrous resin layer 18, and among them, polyolefin is preferable from the viewpoint of weight reduction and appearance. Polypropylene is more preferred.
The thermoplastic resin layer 20 may contain components other than the thermoplastic resin. Examples of components other than the thermoplastic resin include inorganic fillers, mold release agents, flame retardants, colorants and the like. The thermoplastic resin layer 20 is preferably made of a thermoplastic resin as a main component, and more preferably made of a thermoplastic resin. The fact that the thermoplastic resin is the main component means that the content of the thermoplastic resin in the entire thermoplastic resin layer 20 is 50% by mass or more. The content of the thermoplastic resin with respect to the entire thermoplastic resin layer 20 is preferably 70% by mass or more, more preferably 80% by mass or more, further preferably 90% by mass or more, and 95% by mass. The above is particularly preferable.

The inner panel 4 shown in FIG. 2 has the fiber resin layer 18 only in the lock portion 5 and its periphery, but the present invention is not limited to this, and the fiber resin layer may be further provided at other positions. Other positions include a hinge mounting portion 17 on the side wall 13, a damper mounting portion 16 on the side wall 13, and the like. In addition to the lock portion 5, the hinge mounting portion 17 and the damper mounting portion 16 also have a fiber resin layer, so that the mass of the entire inner panel 4 is reduced, and the strength of the lock portion 5 is improved and the back door is used. The deformation of 2 is also suppressed.
The fibrous resin region is preferably 80% or less with respect to the entire surface of the inner panel 4 on the outer panel 3 side from the viewpoint of low cost, and 5% or more and 50% from the viewpoint of achieving both strength improvement and low cost. It is more preferably 10% or more and 40% or less.

-Outer panel-
The outer panel 3 contains at least a thermoplastic resin.
Examples of the type of thermoplastic resin contained in the outer panel 3 include those exemplified as the thermoplastic resin contained in the fiber resin layer 18, among which polyolefin is preferable from the viewpoint of weight reduction and appearance, and polypropylene is preferable. More preferable. The thermoplastic resin contained in the outer panel 3 is preferably a resin of the same type as the thermoplastic resin contained in the thermoplastic resin layer 20 of the inner panel 4 from the viewpoint of adhesion to the inner panel 4. , A component other than the thermoplastic resin may be contained. Examples of components other than the thermoplastic resin include mold release agents, flame retardants, colorants and the like. The outer panel 3 is preferably made of a thermoplastic resin as a main component, and more preferably made of a thermoplastic resin. The fact that the thermoplastic resin is the main component means that the content of the thermoplastic resin in the entire outer panel 3 is 50% by mass or more. The content of the thermoplastic resin with respect to the entire outer panel 3 is preferably 70% by mass or more, more preferably 80% by mass or more, further preferably 90% by mass or more, and 95% by mass or more. It is particularly preferable to have.

-Other parts-
The back door 2 may have other members in addition to the inner panel 4 and the outer panel 3. As long as the mass of the back door 2 as a whole can be reduced, a metal member for reinforcing the hinge mounting portion 17, the damper mounting portion 16, the lock portion 5, and the like of the inner panel 4 may be further used. Further, the back door 2 may have a hinge, a damper, a lock mechanism, a window, or the like as other members.

-Manufacturing method of backdoor-
The method of manufacturing the back door 2 includes a step of preparing an inner panel 4 having a fiber resin layer 18 in a region including a lock portion 5, a step of preparing an outer panel 3, and the obtained inner panel 4 and outer panel 3. Has a step of laminating.

The inner panel 4 containing the thermoplastic resin is formed, for example, by insert molding using a fiber reinforced resin sheet and a thermoplastic resin.
In the inner panel 4, for example, a step of installing a fiber reinforced resin sheet in a mold and a thermoplastic resin are molded by a mold in which the fiber reinforced resin sheet is installed, and the fiber reinforced resin sheet and the thermoplastic resin are integrated. It is manufactured through the process of converting. As a result, the inner panel 4 having the fiber resin layer 18 and the thermoplastic resin layer 20 in the thickness direction in the fiber resin region can be obtained. That is, the method of manufacturing the inner panel 4 is to install a fiber reinforced resin sheet containing the fiber and the resin in the mold and to have the thermoplasticity in the mold in which the fiber reinforced resin sheet is installed. It may include molding a resin.

The fiber reinforced resin sheet is generally flat, and when the shape of the mold at the position where the fiber reinforced resin sheet is installed has irregularities, it is difficult to make the fiber reinforced resin sheet follow the irregularities in a normal molding process. Therefore, before installing the fiber-reinforced resin sheet in the mold, the operation of preheating the fiber-reinforced resin sheet to lower its hardness and the pre-shaping of the fiber-reinforced resin sheet into a shape warped by unevenness are performed. It is desirable to perform preliminary operations such as operations. The fiber reinforced resin sheet installed in the mold may be a preheated one or a preformed body. That is, when manufacturing the inner panel 4, a step of heating the fiber reinforced resin sheet before installing it in the mold, a step of preforming the fiber reinforced resin sheet before installing it in the mold, and the like are further performed. May pass.

The heating temperature in the step of preheating the fiber-reinforced resin sheet before it is installed in the mold is not particularly limited, and examples thereof include a range of 180 ° C. to 240 ° C., and the followability and moldability of the fiber-reinforced resin sheet are easy. From the viewpoint of the above, the range of 190 ° C. to 210 ° C. is preferable.
The step of preliminarily shaping the fiber-reinforced resin sheet before installing it in the mold is not particularly limited, and a known shaping method such as a method of pressing the mold against the fiber-reinforced resin sheet to shape the uneven shape is used. Can be done. The temperature at the time of preforming is not particularly limited and is appropriately set according to the type of fiber and resin constituting the fiber reinforced resin sheet. For example, the temperature is in the range of 160 ° C. to 230 ° C., and is 180 from the viewpoint of appearance. The range of ° C. to 200 ° C. is preferable. The pressure at the time of preforming is not particularly limited, and examples thereof include a range of 0.1 MPa to 10 MPa, and a range of 2 MPa to 8 MPa is preferable from the viewpoint of appearance. The preliminary shaping time is not particularly limited, and examples thereof include a range of 30 seconds to 2 minutes, and a range of 30 seconds to 1 minute is preferable from the viewpoint of improving the production cycle.

The molding method when molding the thermoplastic resin with the mold on which the fiber reinforced resin sheet is installed is not particularly limited, and examples thereof include press molding and injection molding.
The molding conditions for molding the thermoplastic resin in the mold on which the fiber reinforced resin sheet is installed are not particularly limited. The temperature at which the thermoplastic resin is molded in the mold on which the fiber reinforced resin sheet is installed is appropriately set according to the type of the thermoplastic resin, and for example, the range of 210 ° C to 250 ° C can be mentioned to improve the manufacturing cycle. From the viewpoint, the range of 230 ° C to 250 ° C is preferable.

The outer panel 3 containing the thermoplastic resin is formed, for example, by a general method for molding a thermoplastic resin using a mold.
The molding method for molding the thermoplastic resin with the mold is not particularly limited, and examples thereof include press molding and injection molding.
The molding conditions for molding the thermoplastic resin with the mold are not particularly limited. The temperature at which the thermoplastic resin is molded in the mold on which the fiber reinforced resin sheet is installed is appropriately set according to the type of the thermoplastic resin, and for example, the range of 210 ° C to 250 ° C can be mentioned to improve the manufacturing cycle. From the viewpoint, the range of 230 ° C to 250 ° C is preferable.

In the step of laminating and integrating the inner panel 4 and the outer panel 3, for example, the adhesive surface of the inner panel 4 (that is, the edge portion 6 and the edge portion 9) and the adhesive surface of the outer panel 3 are bonded to each other with an adhesive or the like. Adhesion is performed by a method of bonding by heating, a method of heating and fusing, or the like. Examples of the adhesive include urethane-based adhesives.

Although an example of a back door for an automobile has been described above as an example of a vehicle opening / closing body having a lock portion, the vehicle opening / closing body according to the embodiment of the present disclosure is not limited to this, and the side door, etc. It may be an opening / closing body for other vehicles such as a bonnet, a trunk lid, a sunroof, and a fuel lid cover.

Hereinafter, the above-described embodiment will be specifically described with reference to Examples, but the above-mentioned Embodiment is not limited to these Examples.

<Example 1>
A fiber reinforced resin sheet (Lanxess, TEPEX, glass / polypropylene impregnated sheet) was prepared. The prepared fiber-reinforced resin sheet was a sheet obtained by impregnating a woven fabric of glass fiber, which is a continuous fiber, with polypropylene, and had a sheet thickness of 0.5 mm and a sheet area of 2400 cm ² .

The prepared fiber reinforced resin sheet was preliminarily shaped as follows.
Specifically, a press die was prepared only for the lock portion of the inner panel, and the heated fiber reinforced resin sheet was preformed by a cooling press. The sheet temperature at the time of preliminary shaping was 200 ° C., the press pressure was 7 MPa, and the preliminary shaping time was 30 seconds.

A preformed fiber reinforced resin sheet was installed at a position corresponding to the lock portion of the inner panel mold.
A polypropylene resin containing glass fibers is used as the thermoplastic resin for the inner panel, and injection molding is performed under the conditions of a resin temperature of 240 ° C. and an injection pressure of 100 MPa using a mold for the inner panel on which a fiber reinforced resin sheet is installed. An inner panel integrated with a fiber reinforced resin sheet was obtained.
The thickness of the fibrous resin layer in the obtained inner panel was 0.5 mm, and the thickness of the entire bottom wall was 3 mm. The size of the fibrous resin region was 2400 cm ² , which was 20% of the total area of the inner panel on the outer panel side. The content of the thermoplastic resin in the entire thermoplastic resin layer of the bottom wall was 100%.

An outer panel was obtained by using a polypropylene resin as the thermoplastic resin for the outer panel and performing injection molding with a mold for the outer panel under the conditions of a resin temperature of 240 ° C. and an injection pressure of 100 MPa.
The adhesive surface of the obtained inner panel and the adhesive surface of the outer panel were bonded together with a urethane-based adhesive at 25 ° C. to integrate them to obtain a back door.

<Example 2>
The same fiber-reinforced resin sheet as in Example 1 was prepared.
A fiber-reinforced resin sheet heated to 200 ° C. was installed at a position corresponding to the lock portion of the inner panel mold. Using the same thermoplastic resin for inner panel as in Example 1, an inner panel integrated with a fiber reinforced resin sheet was obtained in the same manner as in Example 1.
The thickness of the fibrous resin layer in the obtained inner panel, the thickness of the entire bottom wall, the size of the fibrous resin region, the ratio to the total area on the outer panel side of the inner panel, and the heat of the bottom wall with respect to the entire thermoplastic resin layer. The content of the plastic resin was the same as in Example 1.
An outer panel was obtained in the same manner as in Example 1. The inner panel and the outer panel obtained in the same manner as in Example 1 were integrated to obtain a back door.

<Comparative example 1>
An inner panel was obtained in the same manner as in Example 1 except that the fiber reinforced resin sheet was not used.
An outer panel was obtained in the same manner as in Example 1. The inner panel and the outer panel obtained in the same manner as in Example 1 were integrated to obtain a back door.

<Comparative example 2>
As a metal member, a metal plate made of a steel plate having a thickness of 1.5 mm and an area of 1500 cm ^{2 was prepared.}
An inner panel was obtained in the same manner as in Example 1 except that the fiber reinforced resin sheet was not used.
A metal plate was fixed to the lock part of the inner panel by bolting.
An outer panel was obtained in the same manner as in Example 1. The inner panel and the outer panel obtained in the same manner as in Example 1 were integrated to obtain a back door.

<Evaluation>
-mass-
The mass of the back door was weighed on a digital scale.
Table 1 shows the difference from the mass of the back door of Comparative Example 1. Specifically, Table 1 shows a positive number when the mass is larger than that of Comparative Example 1 and a negative number when the mass is smaller than that of Comparative Example 1.

-Confirmation of destruction mode-
The destruction mode of the lock part at the back door was confirmed as follows.
Specifically, a constant load was applied around the lock of the back door fixed to the jig in the direction in which the lock portion was pulled out, and the breaking mode of the lock peripheral portion was visually confirmed. The results are shown in Table 1.

-Twist test-
The torsional rigidity (torsional displacement amount) of the lock portion of the back door was measured as follows.
Specifically, a test was conducted in which a couple was applied to both sides of the back door with the back door attached to the vehicle body half-opened. The displacement of the back door before and after the test was measured at that time. Table 1 shows the magnitudes of the displacements of Examples 1 and 2 and Comparative Example 2 with respect to the displacement of Comparative Example 1 as indexes.

As can be seen from the results shown in Table 1, in the examples, as compared with the comparative example, it can be seen that the reduction of the mass of the entire back door and the improvement of the strength of the lock portion are compatible.

The disclosure of Japanese Patent Application No. 2019-227067, filed December 17, 2019, is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards described herein are to the same extent as if the individual documents, patent applications, and technical standards were specifically and individually stated to be incorporated by reference. Incorporated herein.

1 body, 2 back door, 3 outer panel, 4 inner panel, 5 lock, 5A lock hole, 6 edge, 8 hinge, 9 edge, 10 damper, 12 opening, 13 side wall, 14 bottom wall, 16 damper Mounting part, 17 hinge mounting part, 18 fiber resin layer, 20 thermoplastic resin layer

Claims

A vehicle opening / closing body having at least a lock portion and containing a thermoplastic resin.
A vehicle opening / closing body having a fiber resin layer containing fibers and a resin in a region including the lock portion.
The vehicle opening / closing body according to claim 1, wherein the fiber is an inorganic fiber.
The vehicle opening / closing body according to claim 2, wherein the fiber is glass fiber.
The vehicle opening / closing body according to any one of claims 1 to 3, wherein the fiber is a continuous fiber woven fabric.
The vehicle opening / closing body according to any one of claims 1 to 4, wherein the vehicle opening / closing body is a back door.
Equipped with an inner panel and an outer panel,
The vehicle opening / closing body according to any one of claims 1 to 5, wherein the fiber resin layer is provided in a region of the inner panel including the lock portion.
The vehicle opening / closing body according to any one of claims 1 to 6, wherein the fiber resin layer and the thermoplastic resin are held on a surface.
The method according to any one of claims 1 to 7, wherein the fiber resin layer is a layer integrated with the thermoplastic resin by insert molding of a fiber reinforced resin sheet containing the fibers and the resin. Opening and closing body for vehicles.
The vehicle opening / closing body according to any one of claims 1 to 8, wherein the fiber resin layer is a preliminary shaped body of a fiber reinforced resin sheet containing the fiber and the resin.
The method for manufacturing a vehicle opening / closing body according to any one of claims 7 to 9.
To install a fiber reinforced resin sheet containing the fiber and the resin in the mold,
Molding the thermoplastic resin in the mold on which the fiber reinforced resin sheet is installed,
A method for manufacturing an opening / closing body for a vehicle including.
The method for manufacturing a vehicle opening / closing body according to claim 10, wherein the fiber-reinforced resin sheet installed in the mold is preheated.