Metal-resin composite and method and apparatus for manufacturing the same

Abstract

To achieve both high bond strength and high rigidity with a simple structure.SOLUTION: A metal-resin composite 1 includes: a metal plate 10; at least one locking member 30 which is joined to the metal plate 10 and has a locking surface 31 facing a surface 11 of the metal plate 10 with a gap G; and a resin material 20 which enters into the gap G and is cured in a state where at least the one locking member 30 is embedded, and is integrated with the metal plate 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a metal-resin composite and a method and apparatus for producing the same. [Background technology]

[0002] BACKGROUND ART Methods for producing a metal resin composite by press-molding a metal plate and a thermosetting resin material are known (for example, Patent Documents 1 to 3).

[0003] In a metal-resin composite, a metal plate and a resin material need to be joined with high joining strength. In Patent Documents 1 to 3, through holes are formed in a metal plate, a resin material is poured into the through holes, the metal plate is sandwiched between the resin materials, and the resin material is thermally cured to integrate the metal plate and the resin material. This ensures high joining strength between the metal plate and the resin material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2014 / 142189 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-97531 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-87924 Summary of the Invention [Problem to be solved by the invention]

[0005] Providing through holes in the metal plate as in Patent Documents 1 to 3 may reduce the rigidity of the metal-resin composite. Furthermore, the shape of the joint requiring the through holes may become complex. Furthermore, the resin material may slip out of the through holes, causing the joint between the metal plate and the resin material to break. Therefore, there is room for improvement in terms of rigidity, structural complexity, and joint strength.

[0006] An object of the present invention is to provide a metal-resin composite and a method and apparatus for producing the same that achieve both high bonding strength and high rigidity with a simple structure. [Means for solving the problem]

[0007] A first aspect of the present invention is A metal plate; at least one locking member joined to the metal plate and having a locking surface facing a surface of the metal plate with a gap therebetween; a resin material that has entered the gap and embedded the at least one locking member therein, and that has hardened and is integrated with the metal plate; The present invention provides a metal-resin composite comprising:

[0008] According to this configuration, the resin material penetrates the gap and hardens while embedding at least one locking member, making it difficult for the resin material to peel off from the metal plate, ensuring high joint strength for integration. Furthermore, since complex processing such as drilling through holes in the metal plate is not required, the rigidity of the metal plate is not reduced and the structure can be simplified. Therefore, in a metal-resin composite, both high joint strength and high rigidity can be achieved with a simple structure.

[0009] The resin material may be disposed on only one side of the metal plate.

[0010] With this configuration, the resin material is placed on only one side of the metal plate, which reduces the number of layers from two to one compared to when the resin material is placed on both sides. This not only simplifies the structure but also reduces the thickness of the resin material. This prevents the thickness of the metal plate from being reduced due to cross-sectional dimension restrictions, ensuring high rigidity of the metal-resin composite.

[0011] The at least one locking member may be a disc spring that is annular when viewed from a direction perpendicular to the surface of the metal plate and has a tapered shape that tapers away from the metal plate. Alternatively, the at least one locking member may be a disc spring that is annular when viewed from a direction perpendicular to the surface of the metal plate and has a tapered shape that tapers toward the metal plate.

[0012] With this configuration, since at least one locking member is made of a disc spring, the metal-resin composite can be easily produced at low cost. Furthermore, since the disc spring is annular, the bonding strength against the force that tries to peel the resin material in any shear direction on the surface of the metal plate can be equalized.

[0013] The at least one locking member may be a rivet having a cap-shaped head.

[0014] According to this configuration, at least one of the locking members is formed by a rivet, so that the metal-resin composite can be easily realized at low cost.

[0015] The at least one locking member may include a plurality of locking members.

[0016] According to this configuration, the plurality of locking members ensures even higher joining strength, and also prevents the resin material from rotating on the surface of the metal plate and peeling off.

[0017] The at least one locking member may have a corner when viewed from a direction perpendicular to the surface of the metal plate.

[0018] According to this configuration, the resin material is caught on the corners, and therefore can be prevented from rotating on the surface of the metal plate and peeling off.

[0019] The metal plate may have a hat shape in a cross section perpendicular to the longitudinal direction, The at least one locking member may be bonded to a flat surface of the metal plate.

[0020] This configuration makes the hat-shaped metal plate highly versatile and useful. In addition, since at least one locking member is bonded to the flat surface, a stable bond between the metal plate and at least one locking member can be achieved.

[0021] A second aspect of the present invention is A method for producing a metal-resin composite by press-molding a metal plate and a resin material, comprising: At least one locking member is joined to the metal plate so as to have a locking surface facing a surface of the metal plate with a gap therebetween; The uncured resin material is allowed to fill the gap on the surface of the metal plate, and the at least one locking member is disposed so as to be embedded therein; The metal plate and the resin material are sandwiched between an upper mold and a lower mold, and the resin material is hardened to integrate the metal plate and the resin material. The present invention provides a method for detecting a temperature difference between a plurality of electrodes.

[0022] A third aspect of the present invention is An apparatus for producing a metal-resin composite by press-molding a metal plate and a resin material, a joining machine that joins at least one locking member to the metal plate so that the locking member has a locking surface that faces a surface of the metal plate with a gap therebetween; an upper mold and a lower mold that sandwich the metal plate and the resin material in a state where the uncured resin material is allowed to enter the gap on the surface of the metal plate and the at least one locking member is disposed in an embedded state, and then harden the resin material to integrate the metal plate and the resin material; An apparatus is provided, comprising: [Effects of the Invention]

[0023] According to the present invention, a metal-resin composite and a method and apparatus for producing the same can achieve both high bonding strength and high rigidity with a simple structure. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view of a metal-resin composite body according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of the metal-resin composite. [Figure 3] FIG. 2 is a cross-sectional view showing a first step of the method for producing a metal resin composite according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing a second step of the method for producing a metal resin composite according to the first embodiment. [Figure 5] FIG. 4 is a cross-sectional view showing a third step of the method for producing a metal resin composite according to the first embodiment. [Figure 6] FIG. 4 is a cross-sectional view showing a fourth step of the method for producing a metal resin composite according to the first embodiment. [Figure 7] FIG. 4 is a cross-sectional view showing a fifth step of the method for producing a metal resin composite according to the first embodiment. [Figure 8] FIG. 4 is a cross-sectional view showing a sixth step of the method for producing a metal resin composite according to the first embodiment. [Figure 9] FIG. 3 is a plan view of a locking member according to the first embodiment. [Figure 10] FIG. 10 is a plan view showing a modified example of the locking member in the first embodiment. [Figure 11] FIG. 10 is a perspective view showing a modified example of the resin material in the first embodiment. [Figure 12] FIG. 10 is a cross-sectional view perpendicular to the longitudinal direction of a metal-resin composite according to a second embodiment. [Figure 13] FIG. 10 is a plan view of a locking member according to a second embodiment. [Figure 14] FIG. 10 is a plan view showing a modified example of the locking member in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A metal-resin composite and a method and apparatus for producing the same will be described below as embodiments of the present invention with reference to the accompanying drawings.

[0026] (First embodiment) 1 and 2, a metal resin composite 1 according to the first embodiment includes a metal plate 10, a resin material 20, and a locking member 30. The metal resin composite 1 has a hat shape in a cross section perpendicular to the longitudinal direction. In Fig. 2, the portion indicated by the dashed circle is shown enlarged.

[0027] The metal-resin composite 1 has a bottom wall 2 extending horizontally, a side wall 3 rising from an end of the bottom wall 2, and a flange 4 extending horizontally outward from the side wall 3. The bottom wall 2 is made of a metal plate 10, a resin material 20, and a locking member 30, the side wall 3 is made of a metal plate 10, a resin material 20, and a locking member 30, and the flange 4 is made of only the metal plate 10. Partway along the side wall 3 from the bottom wall 2 toward the flange 4, the resin material 20 terminates at an end surface 20a.

[0028] The metal plate 10 has a hat shape in a cross section perpendicular to the longitudinal direction. The metal plate 10 does not have any processed parts such as through holes, notches, or irregularities, and is formed by bending a flat plate into a hat shape. However, the shape of the metal plate 10 is not limited to a hat shape.

[0029] The locking member 30 is a disc spring that has an annular shape when viewed perpendicularly to the surface 11 of the metal plate 10 and a tapered shape that tapers away from the metal plate 10 (see FIG. 9 , which will be described later). The locking member 30 has a locking surface 31 that faces the surface 11 of the metal plate 10 with a gap G therebetween. The locking surface 31 is configured as the tapered inner surface of the disc spring and is disposed at a slight incline rather than parallel to the surface 11 of the joined metal plate 10. The locking member 30 has a circular opening 32 that forms the center hole of the annular disc spring and is surrounded by the locking surface 31 (see FIG. 9 , which will be described later). A gap G is defined between the locking surface 31 of the locking member 30 and the surface 11 of the metal plate 10. The gap G is filled with the resin material 20 that has entered through the opening 32. Furthermore, because the locking surface 31 is inclined, the gap G becomes smaller as it moves away from the opening 32.

[0030] The locking member 30 is joined to only one side of the metal plate 10 (the upper side, or the inner surface of the concave shape, in the illustrated example). This joining is achieved, for example, by welding or adhesive. In the case of welding, the metal plate 10 and the locking member 30 are made of the same metal. Multiple locking members 30 are arranged at equal intervals in the longitudinal direction on the bottom wall portion 2 and side wall portion 3 of the metal-resin composite 1. However, the arrangement and number of the locking members 30 are not particularly limited.

[0031] The resin material 20 is fixed to one side of the metal plate 10 (the upper side, or the inner side of the concave shape in the illustrated example) so as to embed the locking member 30, and is integrated with the metal plate 10. However, the resin material 20 may be fixed to both sides of the metal plate 10. The resin material 20 fills the gap G and hardens.

[0032] 3 to 7, a method and apparatus 50 for manufacturing a metal resin composite 1 according to this embodiment will be described. In the drawings, the horizontal direction is indicated as the X direction, and the vertical direction (up-down direction or height direction) is indicated as the Y direction. Furthermore, the metal resin composite 1 (metal plate 10, resin material 20, and locking member 30) is hatched to indicate a cross section, but hatching is omitted for other components to clarify the illustration.

[0033] In this embodiment, two press forming operations and joining processing of the locking member 30 are performed in the sequence of the first to sixth steps shown in Figures 3 to 7. In detail, the first press forming operation is performed in the first and second steps shown in Figures 3 and 4, the joining processing of the locking member 30 is performed in the third step shown in Figure 5, and the second press forming operation is performed in the fourth and sixth steps shown in Figures 6 to 8.

[0034] In this embodiment, the first and second press moldings are performed using separate dies 90, 100, respectively. However, the first and second press moldings may also be performed using the same die. Alternatively, the metal-resin composites 1 may be produced one by one; that is, the first press molding, the joining of the locking members 30, and the second press molding may be performed consecutively. Alternatively, after repeatedly molding the required number of metal sheets 10 (first press molding), the joining of the locking members 30 may be performed on the required number of metal sheets 10, and then the metal sheets 10 and the resin material 20 may be repeatedly molded together (second press molding). Because it takes time to place the resin material 20 on the metal sheets 10, as will be described in detail later, the latter method is preferable from the viewpoint of shortening this time.

[0035] The configuration of the apparatus 50 that executes the series of steps (see FIGS. 3 to 8) will be described. The apparatus 50 has dies 90 and 100, drive units 91 and 101 that drive the dies 90 and 100, respectively, a heating unit 102 that heats the die 100, and a processing machine 130 that performs joining processing of the locking member 30 to the metal plate 10. Note that the drive units 91 and 101 and the heating unit 102 can be known units that can execute press forming, and are shown only in FIGS. 3 and 6 as conceptual diagrams without showing the details, and are not shown elsewhere.

[0036] 3 and 4, a die 90 is used in the first press-forming. The die 90 is used to press-form a flat metal sheet 10 into a hat shape. The die 90 has an upper die 92 and a lower die 93 that sandwich the metal sheet 10. In this embodiment, the upper die 92 is configured as a punch, and the lower die 93 is configured as a die. The upper die 92 is movable in the vertical direction by a drive unit 91, i.e., is configured to be able to move toward and away from the lower die 93. However, the manner in which the drive unit 91 drives the die 90 is not particularly limited, and the drive unit 91 may move at least one of the upper die 92 and the lower die 93 in the vertical direction.

[0037] The upper mold 92 and the lower mold 93 have shapes complementary to the hat shape of the metal sheet 10. The distance between the upper mold 92 and the lower mold 93 is equal to the thickness t of the metal sheet 10 at any point in the mold clamped state (see FIG. 4).

[0038] 5, the processing machine 130 is used to join the locking member 30. The processing machine 130 places and joins the locking member 30 to the flat surface of the surface 11 of the metal plate 10. For example, the processing machine 130 may be a welding machine that welds the locking member 30 onto the flat surface of the metal plate 10.

[0039] 6 to 8, the mold 100 is used in the second press forming. The mold 100 is used to integrate the metal plate 10 and the resin material 20 by warm press forming to produce a metal-resin composite 1. The mold 100 has an upper mold 110 and a lower mold 120 that sandwich the metal plate 10 and the resin material 20. In this embodiment, the upper mold 110 is configured as a punch, and the lower mold 120 is configured as a die. The upper mold 110 is movable in the vertical direction by a drive unit 101, that is, configured to be able to move toward and away from the lower mold 120. However, the manner in which the drive unit 101 drives the mold 100 is not particularly limited, and the drive unit 101 may move at least one of the upper mold 110 and the lower mold 120 in the vertical direction.

[0040] Upper mold 110 has a first upper molding surface 111 that molds bottom wall portion 2 (see FIGS. 1 and 2), a second upper molding surface 112 that molds side wall portion 3 (see FIGS. 1 and 2), and a third upper molding surface 113 that molds flange portion 4 (see FIGS. 1 and 2). In this embodiment, first upper molding surface 111 and third upper molding surface 113 are configured as horizontal surfaces, and second upper molding surface 112 connects first upper molding surface 111 and third upper molding surface 113 and is configured to be inclined from the vertical direction.

[0041] In this embodiment, a step 112a is provided on the second molding upper surface 112. The step 112a is provided so as to rise one step from the first molding upper surface 111 toward the third molding upper surface 113.

[0042] Lower mold 120 has a first molding lower surface 121 that molds bottom wall portion 2 (see FIGS. 1 and 2), a second molding lower surface 122 that molds side wall portion 3 (see FIGS. 1 and 2), and a third molding lower surface 123 that molds flange portion 4 (see FIGS. 1 and 2). In this embodiment, first molding lower surface 121 and third molding lower surface 123 are configured as horizontal surfaces, and second molding lower surface 122 connects first molding lower surface 121 and third molding lower surface 123 and is configured to be inclined from the vertical direction. First molding lower surface 121 is positioned opposite first molding upper surface 111, second molding lower surface 122 is positioned opposite second molding upper surface 112, and third molding lower surface 123 is positioned opposite third molding upper surface 113.

[0043] In a clamped state in which the upper mold 110 and the lower mold 120 are closed (see FIG. 7 ), the distance d1 between the first upper molding surface 111 and the first lower molding surface 121 is greater than the sum of the thickness t of the metal sheet 10 and the height H of the locking member 30 (d1>t+H). The distance d3 between the third upper molding surface 113 and the third lower molding surface 123 is approximately equal to the thickness t of the metal sheet 10 (d3=t). The distance d21 between the second upper molding surface 112 and the second lower molding surface 122 below the step 112a is greater than the sum of the thickness t of the metal sheet 10 and the height H of the locking member 30 (d21>t+H), and the distance d22 between the second upper molding surface 112 and the second lower molding surface 122 above the step 112a is approximately equal to the thickness t of the metal sheet 10 (d22=t). By making the distances d1 and d21 greater than the sum (t+H) of the thickness t of the metal plate 10 and the height H of the locking member 30, the locking member 30 can be embedded in the resin material 20.

[0044] A series of steps (see FIGS. 3 to 8) executed by the device 50 having the above configuration will be described in order.

[0045] 3, the flat metal sheet 10 before forming is placed on a lower die 93. In this step and the next step, the forming of the metal sheet 10 is performed by cold pressing. However, the forming of the metal sheet 10 may also be performed by warm pressing.

[0046] 4, the upper die 92 is lowered, and the metal plate 10 is sandwiched between the upper die 92 and the lower die 93 and press-formed into a hat shape (first press-forming). In this step, the locking member 30 and the resin material 20 (see FIGS. 6 to 8) have not yet been placed, and only the metal plate 10 is sandwiched between the upper die 92 and the lower die 93.

[0047] 5, the hat-shaped metal plate 10 is removed from the mold 90 and set in a processing machine 130. In this step, the processing machine 130 performs joining processing for the locking member 30. That is, the locking member 30 is joined to the metal plate 10.

[0048] In the fourth step shown in FIG. 6 , a sheet-like resin material 20 (also called prepreg) cut to the required dimensions is placed on the metal plate 10 to which the locking member 30 is bonded for the second press molding. In this embodiment, the thermosetting resin material 20 is cured under high temperature and pressure using a molding method known as the SMC (Sheet Molding Compound) method (see also the fifth step described below). In this embodiment, a fiber-reinforced plastic (FRP) resin impregnated with reinforcing fibers such as glass fiber or carbon fiber is used as the resin material 20. Note that in this step, the resin material 20 has not yet been heated, i.e., has not yet been cured. Note that the resin material 20 does not need to be in a sheet shape and can have any shape.

[0049] In the fifth step shown in FIG. 7, the upper mold 110 is lowered, and the metal plate 10 to which the locking member 30 is joined and the resin material 20 are sandwiched and integrated between the upper mold 110 and the lower mold 120. In this embodiment, a cavity C is formed as a space below a step 112a formed by the sandwiching between the upper mold 110 and the lower mold 120 (specifically, the metal plate 10). The resin material 20 is heated while filled in the cavity C and hardens without leaking out of the cavity C. At this time, the end surface 20a of the resin material 20 abuts against the step 112a, enters the gap G (see FIG. 2), and buries the locking member 30.

[0050] 8, the upper mold 110 is raised. A resin material 20 is adhered to the upper surface (the hat-shaped concave surface) of the metal plate 10, thereby forming a metal-resin composite body 1. Note that the resin material 20 is not adhered to the lower surface of the metal plate 10.

[0051] According to this embodiment, the following advantageous effects are achieved.

[0052] Because the resin material 20 penetrates into the gap G and hardens while embedding the locking member 30, the resin material 20 is less likely to peel off from the metal plate 10, ensuring high bonding strength for integration. Furthermore, because no complex processing such as providing through holes in the metal plate 10 is required, the rigidity of the metal plate 10 is not reduced and the structure can be simplified. Therefore, the metal-resin composite 1 can achieve both high bonding strength and high rigidity with a simple structure.

[0053] Furthermore, because the resin material 20 is disposed on only one side of the metal plate 10, the number of layers of the resin material 20 can be reduced from two to one compared to when the resin material 20 is disposed on both sides. This not only simplifies the structure but also reduces the thickness of the resin material 20. This prevents the thickness of the metal plate 10 from being reduced due to restrictions on the cross-sectional dimensions, ensuring high rigidity of the metal-resin composite 1.

[0054] 9, since the locking member 30 is made of a disc spring, the metal-resin composite 1 can be easily produced at low cost. Furthermore, since the disc spring is annular, the bonding strength against a force that tries to peel off the resin material 20 in any shear direction of the surface 11 of the metal plate 10 can be made uniform. Note that, in FIG. 9, the resin material 20 is not shown for clarity.

[0055] Since the locking members 30 are provided at a plurality of locations, a higher bonding strength can be ensured. Also, the resin material 20 can be prevented from rotating on the surface 11 of the metal plate 10 and peeling off.

[0056] The hat-shaped metal plate 10 is highly versatile and useful. In addition, since the locking member 30 is joined to a flat surface, a stable joining between the metal plate 10 and the locking member 30 can be achieved.

[0057] 10, a modified example of the locking member 30 of this embodiment is a disc spring that is annular when viewed from a direction perpendicular to the surface 11 of the metal plate 10 and has a tapered shape that narrows toward the metal plate 10. In other words, it is arranged upside down compared to the above embodiment. Note that in FIG. 10, the portion indicated by the dashed circle is shown enlarged.

[0058] 11, the resin material 20 does not have to have the same thickness. The resin material 20 may have beam-like portions 21 that protrude like beams. In the example shown, the beam-like portions 21 have a lattice shape in a plan view, protruding upward from the bottom wall portion 2 and extending horizontally to connect the side wall portions 3, 3. The upper mold 110 has a concave shape complementary to the beam-like portions 21.

[0059] (Second embodiment) A metal-resin composite 1 according to a second embodiment will be described with reference to FIGS. 12 and 13. In this embodiment, the shape of the locking member 30 of the metal-resin composite 1 is different from that of the first embodiment. Other configurations are substantially the same as those of the first embodiment. Therefore, descriptions of parts shown in the first embodiment may be omitted. Note that FIG. 12 shows an enlarged view of the part indicated by the dashed circle. Also, in FIG. 13, the resin material 20 is omitted for clarity.

[0060] In this embodiment, the locking member 30 is a rivet. The locking member 30 has a long, thin, cylindrical leg portion 34 that is joined to the surface 11 of the metal plate 10, and a cylindrical head portion 33 that is fixed to the tip of the leg portion 34 and has a larger diameter and is thinner than the leg portion 34. The lower surface of the head portion 33 (the surface facing the surface 11 of the metal plate 10) serves as the locking surface 31. The locking surface 31 is, for example, a surface parallel to the surface 11 of the metal plate 10. The leg portion 34 and the head portion 33 are arranged concentrically when viewed from a direction perpendicular to the surface 11 of the metal plate 10, i.e., they share a central axis.

[0061] According to this embodiment, the locking member 30 is formed of a rivet, so that the metal resin composite 1 can be produced easily and at low cost. The method and apparatus for producing the metal resin composite 1 according to the second embodiment are the same as those of the first embodiment except for the parts relating to the locking member 30.

[0062] 14, a modification of the locking member 30 of this embodiment has a polygonal (hexagonal in the illustrated example) head 33 when viewed from a direction perpendicular to the surface of the metal plate 10. Therefore, the locking member 30 has sharp corners 33b when viewed from this direction. Note that, in FIG. 14, the resin material 20 is omitted for clarity.

[0063] Since the resin material 20 is caught by the corners 33b, it is possible to prevent the resin material 20 from rotating on the surface 11 of the metal plate 10 and peeling off.

[0064] While specific embodiments and modifications of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be implemented with various modifications within the scope of the present invention. For example, an appropriate combination of the contents of the individual embodiments and modifications may be used as an embodiment of the present invention.

[0065] Alternatively, a thermoplastic resin impregnated with reinforcing fibers such as glass fiber or carbon fiber may be used as the resin material 20. In this case, the resin material 20 is heated and softened before being poured into the mold 100. The resin material 20 is then cooled and hardened on the metal plate 10 within the mold 100, thereby producing the metal resin composite 1.

[0066] Furthermore, in the metal resin composite 1, an adhesive layer may be provided between the metal plate 10 and the resin material 20. In this case, by providing the adhesive layer, the metal plate 10 and the resin material 20 can be firmly molded into one piece. [Explanation of symbols]

[0067] 1 Metal resin composite 2 Bottom wall 3 Side wall 4 Flange 10 metal plate 11 Surface 20 Resin material 20a end face 21 Beam-shaped part 30 Locking member 31 Locking surface 32 Opening 33 Head 33a Locking surface 33b Corner 34 Legs 50 equipment 90 Molds 91 Drive unit 92 Upper mold 93 Lower mold 100 molds 101 Drive unit 102 Heating section 110 upper type 111 1st molding top surface 112 Second molding top surface 112a Steps 113 Third molding top surface 120 Lower mold 121 First molding bottom surface 122 Second molding bottom surface 123 Third molding bottom surface 130 Processing machine S Gap C cavity

Claims

1. A metal plate; at least one locking member joined to the metal plate and having a locking surface facing a surface of the metal plate with a gap therebetween; a resin material that has entered the gap and embedded the at least one locking member therein, and that has hardened and is integrated with the metal plate; Equipped with The at least one locking member is a disc spring having a circular ring shape when viewed from a direction perpendicular to the surface of the metal plate and a tapered shape that tapers away from the metal plate.

2. A metal plate, at least one locking member joined to the metal plate and having a locking surface facing a surface of the metal plate with a gap therebetween; a resin material that has entered the gap and embedded the at least one locking member therein, and that has hardened and is integrated with the metal plate; Equipped with The at least one locking member is a disc spring having a circular ring shape when viewed from a direction perpendicular to the surface of the metal plate and a tapered shape that narrows in a direction approaching the metal plate.

3. The metal-resin composite body according to claim 1 , wherein the resin material is disposed on only one surface of the metal plate.

4. The metal-resin composite according to claim 1 , wherein the at least one locking member includes a plurality of locking members.

5. The metal-resin composite according to claim 1 or 2, wherein the at least one locking member has a corner when viewed from a direction perpendicular to the surface of the metal plate.

6. the metal plate has a hat shape in a cross section perpendicular to the longitudinal direction, The metal-resin composite according to claim 1 or 2, wherein the at least one locking member is bonded to a flat surface of the metal plate.

7. A method for producing a metal-resin composite by press-molding a metal plate and a resin material, comprising: At least one locking member is joined to the metal plate so as to have a locking surface facing a surface of the metal plate with a gap therebetween; The uncured resin material is allowed to fill the gap on the surface of the metal plate, and the at least one locking member is disposed so as to be embedded therein; The metal plate and the resin material are sandwiched between an upper mold and a lower mold, and the resin material is hardened to integrate the metal plate and the resin material. This includes: The method, wherein the at least one locking member is a disc spring having an annular shape when viewed from a direction perpendicular to the surface of the metal plate and a tapered shape that tapers away from the metal plate.

8. A method for producing a metal-resin composite by press-molding a metal plate and a resin material, comprising: At least one locking member is joined to the metal plate so as to have a locking surface facing a surface of the metal plate with a gap therebetween; The uncured resin material is allowed to fill the gap on the surface of the metal plate, and the at least one locking member is disposed so as to be embedded therein; The metal plate and the resin material are sandwiched between an upper mold and a lower mold, and the resin material is hardened to integrate the metal plate and the resin material. This includes: The method, wherein the at least one locking member is a disc spring having an annular shape when viewed from a direction perpendicular to the surface of the metal plate and a tapered shape that narrows in a direction approaching the metal plate.

9. An apparatus for producing a metal-resin composite by press-molding a metal plate and a resin material, a joining machine that joins at least one locking member to the metal plate so that the locking member has a locking surface that faces a surface of the metal plate with a gap therebetween; an upper mold and a lower mold that sandwich the metal plate and the resin material in a state where the uncured resin material is allowed to enter the gap on the surface of the metal plate and the at least one locking member is disposed in an embedded state, and then harden the resin material to integrate the metal plate and the resin material; Equipped with The device, wherein the at least one locking member is a disc spring having an annular shape when viewed from a direction perpendicular to the surface of the metal plate and a tapered shape that tapers in a direction away from the metal plate.

10. An apparatus for producing a metal-resin composite by press-molding a metal plate and a resin material, a joining machine that joins at least one locking member to the metal plate so that the locking member has a locking surface that faces a surface of the metal plate with a gap therebetween; an upper mold and a lower mold that sandwich the metal plate and the resin material in a state where the uncured resin material is allowed to enter the gap on the surface of the metal plate and the at least one locking member is disposed in an embedded state, and then harden the resin material to integrate the metal plate and the resin material; Equipped with The device, wherein the at least one locking member is a disc spring having an annular shape when viewed from a direction perpendicular to the surface of the metal plate and a tapered shape that narrows in a direction approaching the metal plate.

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