JP6614205B2 - Method of joining metal member and resin member and metal member or resin member used in the method - Google Patents

Description

  The present invention relates to a method for joining a metal member and a resin member, and a metal member or a resin member used in the method.

  Conventionally, weight reduction has been demanded in the fields of automobiles, railway vehicles, aircraft, and the like. For example, in the field of automobiles, the use of high-tensile materials has made it possible to reduce the thickness of steel sheets, or aluminum alloy materials have been used as substitutes for steel materials, and the use of resin materials has also advanced. In this field, the development of joining technology for metal members and resin members is important not only from the viewpoint of weight reduction, but also from the viewpoint of realizing higher strength and higher rigidity of the joining member and improved productivity. .

  Up to now, as a joining method between a metal member and a resin member, a friction stir welding (FSW) method, a resistance heating joining method (electric heating joining method), an induction heating joining method, an ultrasonic heating joining method, etc. In addition, a hot-pressure bonding method in which heating is performed while applying pressure is known (for example, Patent Documents 1 and 2).

  On the other hand, in the hot-pressure bonding method, in order to prevent the formation of burrs based on the molten resin leaking from between the metal member and the resin member, the molten resin is caused to flow into at least one of the metal member or the resin member. A technique for forming a pool groove is disclosed (Patent Document 3).

JP 2008-023583 A JP 2011-088197 A JP-A-2015-131444

  The inventors of the present invention ensure sufficient bonding strength when a third component such as an adhesive and a sealing material is interposed between the metal member and the resin member by the conventional hot-pressure bonding method. I found it difficult to do. If an adhesive is present in the joining region between the metal member and the resin member, the adhesive inhibits the joining of the two, and it is considered that sufficient joining strength cannot be obtained.

  Therefore, the inventors of the present invention have tried to control the adhesive application area when the metal member 211 and the resin member 212 are overlapped as shown in FIG. 14, for example, in the friction stir welding method. That is, on the surface 2120 of the resin member 212 facing the metal member 211, the adhesive 203 was applied linearly (bead shape) while avoiding the region Q directly below the rotary tool 216, and friction stir welding was performed. However, the flow of the adhesive to the bonding region cannot be sufficiently suppressed, and the bonding strength may also decrease.

  When the inventors of the present invention control the application area of the adhesive by a method similar to the above in other hot-pressure bonding methods other than the friction stir welding method, the bonding strength may still decrease. .

  In this way, when the hot-pressure bonding in which the adhesive is applied between the metal member and the resin member is performed on a member having a limited bonding area such as a flange, the problem of reduction in bonding strength is particularly serious. It was a thing. Specifically, in order to avoid a decrease in bonding strength due to the adhesive, the bonding strength is still decreased because the adhesive cannot be applied sufficiently away from the region immediately below the rotary tool.

  The present invention relates to a method for joining a metal member and a resin member that can provide better joint strength even when an adhesive is applied between the metal member and the resin member, and the metal member used in the method. Alternatively, an object is to provide a resin member.

  The present invention also provides a method of joining a metal member and a resin member that can provide better joint strength even when an adhesive is applied between the metal member and the resin member having a limited joint area, and the method thereof. It aims at providing the metal member or resin member used in a method.

The present invention
A thermo-pressure type in which an adhesive is applied between the metal member and the resin member, and the resin member is melted by applying pressure and heat from the metal member side to melt and joining the metal member and the resin member. A joining method between a metal member and a resin member by a joining method,
At least one of the surface of the resin member facing the metal member or the surface of the metal member facing the resin member is formed with a flow suppression groove that suppresses the flow of the adhesive to the bonding region in the overlapped state. The present invention relates to a method for joining a metal member and a resin member.

  The present invention also relates to a metal member or a resin member used in the joining method.

According to the bonding method of the present invention, in any hot-pressure bonding method, even when an adhesive is applied between the metal member and the resin member, better bonding strength can be obtained.
The joining method of the present invention is excellent in workability, and even when an adhesive is applied between a metal member with a limited joining area, such as a flange, and a resin member, better joining is achieved. Strength is obtained.

It is a typical perspective view which shows an example of a part of friction stir welding apparatus suitable for the joining method of the metal member and resin member concerning this invention. It is a typical perspective view which shows an example of the resin member to which the adhesive agent was apply | coated in this invention. It is a typical perspective view which shows another example of the resin member to which the adhesive agent was apply | coated in this invention. The upper diagram is a schematic top plan view of an example of the resin member used in FIG. 1, and the lower diagram is a schematic sectional view when the AA section of the upper diagram is viewed in the direction of the arrow. It is a schematic sectional drawing for demonstrating the superimposition process and the preheating process in the joining method which concerns on one embodiment of this invention using the resin member of FIG. It is a schematic sectional drawing for demonstrating the pushing stirring process in the joining method which concerns on one embodiment of this invention using the resin member of FIG. 4, a stirring maintenance process, and a holding process. It is a schematic sectional drawing of an example of the resin member used for the joining method of this invention. The upper figure is a schematic top view of an example of a metal member used in the joining method of the present invention, and the lower figure is a schematic sectional view when the AA section of the upper figure is viewed in the direction of the arrow. It is a schematic sectional drawing for demonstrating the superimposition process and preheating process in the joining method which concerns on one embodiment of this invention using the metal member of FIG. It is an enlarged view near the front-end | tip part of an example of the rotary tool used for the joining method of this invention. It is an xy coordinate for demonstrating an example of the inner boundary line which prescribes | regulates the ring shape which a flow suppression groove | channel can have. It is an xy coordinate for demonstrating an example of the inner side boundary line which prescribes | regulates the ellipse shape which a flow suppression groove | channel can have. FIG. 5 is a schematic plan view of a resin member obtained by forcibly peeling a metal member from a joined body obtained by the joining method according to an embodiment of the present invention using the resin member of FIG. 4. It is a graph which shows the result obtained in the Example. It is a typical perspective view of the friction stir welding apparatus for demonstrating the joining method of the metal member and resin member in a prior art.

  The joining method of the present invention softens the resin member by superimposing the metal member and the resin member and applying pressure and heat from the metal member side, preferably locally from the metal member side. The present invention relates to a hot-pressure bonding method for melting and bonding a metal member and a resin member. The joining method employed in the joining method of the present invention is not particularly limited as long as it is a method of heating while applying pressure. For example, a friction stir welding method, a resistance heating joining method (electric heating joining method), induction A heat bonding method, an ultrasonic heat bonding method, or the like may be used. Among these, the friction stir welding method is preferably employed.

In the friction stir welding method, as will be described in detail later, frictional heat generated by overlapping a metal member and a resin member and pressing the metal member while rotating a rotary tool as a pressing member is used. Then, the metal member and the resin member are joined.
In the resistance heating joining method, the metal member and the resin member are joined by using heat generated by passing an electric current through the metal member while being pressed from the metal member side by an electrode (pressing member).
The induction heating joining method is a method in which an induction current is generated in a metal member by electromagnetic induction while pressing from the metal member side by a pressing member, and heat generated by the current is used. The metal member and the resin member are joined.
In the ultrasonic heating joining method, the metal member and the resin member are performed by using frictional heat generated by micro-slip between the plates by applying ultrasonic waves while applying pressure from the metal member side by the pressing member.

  Hereinafter, the joining method of the present invention employing the friction stir welding method will be described with reference to FIGS. With reference to the following description of the friction stir welding method, it is apparent that the same actions and effects as those in the friction stir welding method can be obtained in other hot-pressure welding methods. For example, also in other hot-pressure bonding methods, when a metal member and a resin member are applied with an adhesive between them, they are overlapped, and pressure and heat are applied from the metal member side. A flow suppression groove is formed in advance on at least one of the opposing surfaces. As a result, in the overlapped state, the adhesive flows into the flow suppression groove, and the flow of the adhesive to the joining region is suppressed. As a result, better bonding strength can be obtained. 1 to 13, common reference numerals indicate the same members, parts, dimensions, or regions unless otherwise specified.

[Method of joining metal member and resin member by friction stir welding method]
FIG. 1 is a diagram schematically showing an example of a part of a friction stir welding apparatus suitable for carrying out the joining method of the present invention. A friction stir welding apparatus 1 shown in FIG. 1 is configured as a device for friction stir welding a metal member 11 and a resin member 12, and includes a columnar rotary tool 16 as a pressing member. As shown in the drawing, the rotary tool 16 is applied to the workpiece 10 with the metal member 11 on the top and the resin member 12 on the bottom, as indicated by an arrow A1 by a drive source not shown. While rotating around the central axis X (see FIG. 10), the metal member 11 is pressed downward in the pressing region P (scheduled pressing region) as indicated by an arrow A2. Frictional heat is generated by the pressing of the rotary tool 16 and is conducted to the resin member 12.

  Below the rotary tool 16, a cylindrical receiving member 17 having the same diameter as the rotary tool 16 or a larger diameter than the rotary tool 16 is arranged coaxially with the rotary tool 16. The receiving member 17 is moved upward with respect to the work 10 as shown by an arrow A3 by a driving source (not shown). The upper end surface of the receiving member 17 abuts on the lower surface of the workpiece 10 (more specifically, the lower surface of the resin member 12) by the time the rotating tool 16 starts pressing the workpiece 10 at the latest. The support 17 sandwiches the workpiece 10 between the rotary tool 16 and supports the workpiece 10 from below against the pressing force during a pressing period by the rotary tool 16, that is, during friction stir welding. Note that the receiving tool 17 does not necessarily have to be moved in the direction of the arrow A3, and a method of moving the rotary tool 16 in the direction of the arrow A2 after placing the workpiece 10 on the receiving tool 17 can also be adopted.

  The friction stir welding apparatus 1 is attached to a drive control device (not shown) composed of an articulated robot or the like. The coordinate positions of the rotary tool 16 and the receiving tool 17, the rotational speed (rpm) of the rotary tool 16, the pressure (N), the pressurization time (second), and the like are appropriately controlled by the drive control device. Although not shown in FIG. 1, the friction stir welding apparatus 1 uses a spacer, a clamp, or the like for fixing the work 10 in advance and preventing the metal member 11 from floating when the rotary tool 16 is pressed. A jig is provided.

In the present invention, at least one of the metal member 11 or the resin member 12 has the flow suppression groove 5 on the surface facing the other member. A flow suppression groove | channel is a groove | channel for suppressing the flow of an adhesive agent. In the present invention, “flow” means “moving while flowing”.
For example, as shown in FIGS. 4 and 5, the resin member 12 has the flow suppression groove 5 on the surface 120 facing the metal member 11, and the metal member 11 has the flow suppression groove on the surface 110 facing the resin member 12. May have a planar shape (hereinafter referred to as “Aspect A1”).
Further, for example, as shown in FIGS. 8 and 9, the metal member 11 has the flow suppression groove 5 on the surface 110 facing the resin member 12, and the resin member 12 is flow-suppressed on the surface 120 facing the metal member 11. It may have a planar shape without having a groove (hereinafter referred to as “Aspect A2”).
Further, for example, the resin member 12 has the flow suppression groove 5 on the surface 120 facing the metal member 11 as shown in FIGS. 4 and 5, and the metal member 11 has the resin member 12 as shown in FIGS. 8 and 9. The flow suppressing groove 5 may be provided on the facing surface 110 (hereinafter referred to as “aspect A3”).

  From the viewpoint of further improving the bonding strength and workability, at least the resin member 12 preferably has the flow suppression groove 5. In the preferable embodiment, the above-described aspects A1 and A3 are included. In view of the balance between the same viewpoint and the viewpoint of manufacturing cost, the aspect A1 is more preferable. The shape, size, arrangement, and the like of the flow suppression groove 5 of the metal member 11 and the flow suppression groove 5 of the resin member 12 are common except that the formation surface of the flow suppression groove 5 is different.

  In the present invention, the workability is a performance that can provide better bonding strength even when an adhesive is applied between a metal member with a limited bonding area such as a flange and a resin member. That is. In particular, when the flow suppression groove 5 has a ring shape as described later as a plan view shape, the workability is better even if the inner area (that is, the area defined by the inner boundary line 51) is relatively small. It is the performance that can achieve the bonding strength. The fact that the bonding area is limited means that when the metal member and the resin member are overlapped, the contact area is relatively small, so that the bonding area is limited. The plan view is a plan view when viewed from above in the axial direction of a pressing member (for example, a rotating tool described later). The cross-sectional view is a cross-sectional view parallel to the axial direction of a pressing member (for example, a rotating tool described later).

  In the present invention, since at least one of the metal member 11 or the resin member 12 has the flow suppression groove 5, as shown in FIG. 5 or FIG. Flow in the direction of arrow F) can be suppressed. Specifically, when the adhesive 3 flows into the flow suppression groove 5, the flow and movement of the adhesive to the joining region are suppressed. Even at the time of joining, the flow and movement of the adhesive to the joining region are suppressed. The joining region is a region in which joining and joining with the metal member 11 are achieved between the metal member 11 and the resin member 12 by melting and solidifying the resin member 12. The joining region includes at least a region directly below the pressing member (for example, a rotating tool) between the metal member 11 and the resin member 12. At the time of joining, the molten resin in the region immediately below the pressing member in the resin member 11 flows radially toward the outer peripheral side direction K, that is, from the center of the immediately lower region 60 toward the outer peripheral region 61 as shown in FIG. And move. For this reason, the joining region includes a region directly below the pressing member (for example, a rotary tool) between the metal member 11 and the resin member 12 and an outer peripheral region thereof.

  The flow suppression groove 5 is positioned at least between the region immediately below the pressing member and the adhesive application region in plan view, and may be positioned in another region.

  For example, as shown in FIGS. 1, 2, 4, and 8, the flow suppression groove 5 has a certain distance around a region (for example, P ′, P ″) immediately below the pressing member in plan view. It may be formed in a ring shape (hereinafter referred to as “aspect B1”). The annular shape is a shape in which a start point and an end point are connected in a straight line, a curved line, or a mixed line thereof, and may have an elliptical shape as shown in FIGS. 1 and 4, or as shown in FIGS. A circular shape may be sufficient, or ring shapes other than these shapes may be sufficient. In the present invention, the oval shape is used as a concept including a circular shape.

  For example, as shown in FIG. 3, the flow suppression groove 5 has a curved shape and a linear shape with a certain distance around a region (for example, P ′, P ″) immediately below the pressing member in plan view. It may be formed in a composite line shape including the following (hereinafter referred to as “aspect B2”).

  Further, for example, the flow suppression groove 5 may be formed in only a curved shape or a linear shape at a certain distance from a region directly below the pressing member in plan view (hereinafter referred to as “aspect B3”).

  Aspects B1 and B3 are preferable from the viewpoint of further improving the bonding strength and workability, and Aspect 1 is more preferable from the balance between the same viewpoint and the viewpoint of manufacturing cost.

  The distance L1 (FIGS. 4 and 8) between the flow suppression groove 5 and the region immediately below the pressing member (for example, P ′, P ″) is usually the maximum width (diameter) D1 of the pressing member (for example, the rotary tool 16). About (mm), it is 0.1 * D1-5 * D1. The distance L1 is preferably 0.2 × D1 to 3 × D1, more preferably 0.25 × D1 to 1 × D1, from the viewpoint of further improving the bonding strength and workability. The distance L1 between the flow suppression groove 5 and the region directly below the pressing member is the shortest distance among the distances between the flow suppression groove 5 and the region directly below the pressing member.

  The maximum width (diameter) D1 of the pressing member (rotating tool 16) is usually in the same range as the diameter of the rotating tool 16 described in detail later.

  The width W1 and the depth t1 (FIGS. 4 and 8) of the flow suppression groove 5 are not particularly limited as long as the flow of the adhesive 3 to the joining region can be suppressed. For example, the flow suppression groove 5 does not necessarily have to accommodate all the adhesive 3 that flows to the joining region. Further, for example, the width W1 and the depth t1 of the flow suppression groove 5 are 0.5 mm and 0.5 mm, respectively, and the flow suppression groove 5 cannot completely accommodate all the adhesive 3 that flows to the joining region. Even if it is a case, the said flow suppression groove | channel 5 will inhibit the flow to the joining area | region of an adhesive agent, and the suppression of the said flow is achieved as a result.

  Accordingly, the width W1 of the flow suppression groove 5 is not particularly limited. For example, the maximum width (diameter) D1 (mm) of the pressing member (for example, the rotary tool 16) is usually 0.01 × D1 or more, particularly preferably 0. 01 × D1 to 0.5 × D1. From the viewpoint of further improving the bonding strength and workability, the width W1 of the flow suppression groove 5 preferably has a width of 0.1 × D1 to 0.5 × D1. The width W1 is normally constant, but may vary within the above range.

  The depth t1 of the flow suppression groove 5 is not particularly limited. For example, the maximum width (diameter) D1 (mm) of the pressing member (for example, the rotary tool 16) is usually 0.01 × D1 or more, particularly 0.01. × D1 to 0.5 × D1. From the viewpoint of further improving the bonding strength and workability, the depth t1 of the flow suppression groove 5 preferably has a width of 0.1 × D1 to 0.5 × D1. The depth t1 is usually constant, but may vary within the above range.

When the flow suppression groove 5 has an elliptical shape in plan view, the elliptical shape defined by the inner boundary line 51 that defines the flow suppression groove 5 has the following dimensions from the viewpoint of further improving the bonding strength and workability. Preferably:
The minor axis ds is 0.5 × D1 to 4.5 × D1, preferably 1 × D1 to 4 × D1, more preferably 1.5 × D1 to 3 × D1;
The major axis dL is 1.5 × D1 to 6.5 × D1, preferably 2 × D1 to 6 × D1, and more preferably 2.5 × D1 to 5 × D1.

  The cross-sectional shape of the flow suppression groove 5 is not particularly limited as long as it is a shape that can suppress the flow of the adhesive. For example, the flow suppression groove 5 may have a substantially rectangular shape as shown in FIGS. The shape may be sufficient, or a substantially triangular shape may be sufficient.

When the flow suppression groove 5 is provided in the resin member 12, the flow suppression groove 5 is preferably formed by integral molding of the resin member 12. After manufacturing the resin member 12 that does not have the flow suppression groove 5, the flow suppression groove 5 may be formed by cutting.
When the flow suppression groove 5 is provided in the metal member 11, it is preferable to form the flow suppression groove 5 by cutting after manufacturing the metal member 11 that does not have the flow suppression groove 5. The flow suppression groove 5 may be formed by integral molding of the metal member 11.

  The adhesive 3 may be applied to any member as long as it is applied between the metal member 11 and the resin member 12. For example, the adhesive may be applied only to the resin member 12 as shown in FIGS. 1 to 3, or may be applied only to the metal member 11, or the metal member 11 and the resin member 12 It may be applied to both. It is preferable that the adhesive is applied only to the resin member 12 from the viewpoint of further improving the bonding strength and workability and the manufacturing cost.

  The application method and application shape of the adhesive 3 are not particularly limited as long as the adhesive can be applied to a desired region. The application method and the application shape of the adhesive 3 may be applied in any shape in any method while ensuring the distance L2 between the flow suppression groove 5 and the application region of the adhesive 3. For example, the adhesive 3 is linear (bead-shaped) (straight, curved or complex linear) by a line coating method, a dot coating method, a surface coating method, or a roll coating method (FIGS. 1 to 3). ), Dot shape, planar shape, or a composite shape thereof.

  The distance L2 between the flow suppression groove 5 and the application region of the adhesive 3 is normally 0.5 × D1 to 10 × D1 with respect to the maximum width (diameter) D1 (mm) of the pressing member (for example, the rotary tool 16). . The distance L2 is preferably 0.5 × D1 to 5 × D1, and more preferably 0.5 × D1 to 3 × D1, from the viewpoint of further improving the bonding strength and workability. The distance L2 between the flow suppression groove 5 and the application region of the adhesive 3 is the shortest distance among the distances between the flow suppression groove 5 and the application region of the adhesive 3.

  The adhesive 3 conventionally includes any material that can contribute to the adhesion between the metal member 11 and the resin member 12. Therefore, the adhesive 3 is used in a concept including not only a material used as an adhesive in the field but also a sealing material used for sealing between the metal member 11 and the resin member 12. . Examples of the material constituting the adhesive 3 include thermosetting resins such as epoxy resins, urethane resins, acrylic resins, and mixtures thereof, synthetic rubber resins, polyvinyl chloride resins, and mixtures thereof. A thermoplastic resin is mentioned. When a thermosetting resin is used as the adhesive 3, a thermosetting resin having a curing temperature lower than the softening point of the resin member 12 is usually used.

The amount of adhesive 3 used (applied amount) is usually such that the thickness of the adhesive layer after bonding is 0.1 to 1.5 mm, particularly 0.2 to 0.5 mm. The use amount (application amount) of the adhesive 3 is usually 10 to 500 mg / m ² , and preferably 50 to 300 mg / m ² from the viewpoint of further improving the bonding strength.

  The adhesive 3 may be made of only the above constituent material, or may contain the above constituent material, an organic solvent, and other additives.

  Hereinafter, preferred embodiments 1 and 2 will be described. Embodiments 1 and 2 are preferable from the viewpoint of further improving the bonding strength and workability, and Embodiment 2 is more preferable from the same viewpoint. Embodiment 1 includes embodiment 2.

(1) Embodiment 1
In the present embodiment, the flow suppression groove 5 is formed in an annular shape around a region immediately below the pressing member 16 with a certain distance. Of the inner boundary line 51 and the outer boundary line 52 that define the annular flow restricting groove 5, the inner boundary line 51 has an annular shape and dimensions that can be represented in the following regions:
For the maximum width (diameter) D1 (mm) of the pressing member, as shown in FIG. 11A, the minor axis = 1.5 × D1 and the major axis = 2.5 × D1, the ellipse Es and the minor axis = 3 × D1, and the major axis = A region formed between the ellipse Es and the ellipse Eb when the 5 × D1 ellipse Eb is represented on the xy coordinates with the midpoint between the two focal points of each ellipse as the origin.
FIG. 11A is an xy coordinate for explaining an example of an inner boundary line that defines an annular shape that the flow suppressing groove 5 may have.

  The ring shape of the inner boundary line 51 may be any ring shape and size that can be represented in the region. However, the ring shape always passes through the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant on the xy coordinates of the region. The slope of the tangent to the ring shape may usually vary continuously. As a specific example of such a ring shape, for example, a ring shape E1 shown in FIG.

  The outer boundary line 52 of the flow suppression groove 5 is usually defined with a distance from the inner boundary line 51 by the width W1 described above.

When at least one of the metal member 11 or the resin member 12 has the annular flow suppression groove 5 defined in this embodiment, the pressing member 16 normally presses the metal member 11 so that the following overlap occurs:
The overlap between the center of the pressing region P (or the region immediately below the pressing member (for example, P ′, P ″)) on the surface of the metal member 11 by the pressing member 16 and the origin of the xy coordinates in plan view. Here, the plan view is a plan view including fluoroscopy.
The overlap does not necessarily have to occur strictly. For example, a deviation of ± 1 × D1 is allowed.

  When the flow suppression groove 5 has a ring shape as in the present embodiment and the adhesive has a coating shape having a main axis as a whole, the major axes of the ellipses Es and Eb on the xy coordinates that define the ring shape The adhesive is preferably applied so that the direction is parallel to the main axis direction of the applied shape. The application shape having the main axis is a linear shape (bead shape) including a linear shape as shown in FIGS. The axial direction of the longest linear portion constituting the coating shape having such a main axis is the main axis direction.

(2) Embodiment 2
In the present embodiment, the flow suppression groove 5 is formed in an annular shape around a region immediately below the pressing member 16 with a certain distance. Of the inner boundary line 51 and the outer boundary line 52 that define the annular flow restricting groove 5, the inner boundary line 51 has an elliptical shape and dimensions that can be represented in the following regions:
For the maximum width (diameter) D1 (mm) of the pressing member, as shown in FIG. 11B, the ellipse Es and the minor axis = 3 × D1 and the major axis = 1.5 × D1 and major axis = 2.5 × D1 A region formed between the ellipse Es and the ellipse Eb when the 5 × D1 ellipse Eb is represented on the xy coordinates with the midpoint between the two focal points of each ellipse as the origin.
FIG. 11B is an xy coordinate for explaining an example of an inner boundary line that defines an elliptical shape that the flow suppressing groove 5 may have.

  The elliptical shape of the inner boundary line 51 may be any elliptical shape and size that can be represented in the region. However, the elliptical shape always passes through the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant on the xy coordinates of the region. Specific examples of such elliptical shapes include, for example, ring shapes E2 to E4 shown in FIG. 11B.

  The outer boundary line 52 of the flow suppression groove 5 is usually defined with a distance from the inner boundary line 51 by the width W1 described above.

When at least one of the metal member 11 or the resin member 12 has the elliptical flow suppression groove 5 defined in this embodiment, the pressing member 16 normally presses the metal member 11 so that the following overlap occurs:
The overlap between the center of the pressing region P (or the region immediately below the pressing member (for example, P ′, P ″)) on the surface of the metal member 11 by the pressing member 16 and the origin of the xy coordinates in plan view. Here, the plan view is a plan view including fluoroscopy.
The overlap does not necessarily have to occur strictly. For example, a deviation of ± 1 × D1 is allowed.

  When the flow suppression groove 5 has an elliptical shape as in this embodiment and the adhesive has a coating shape having a main axis as a whole, the major axis direction of the elliptical shape is parallel to the main axis direction of the coating shape. In addition, the adhesive is preferably applied. The application shape having the main axis is a linear shape (bead shape) including a linear shape as shown in FIGS. The axial direction of the longest linear portion constituting the coating shape having such a main axis is the main axis direction.

(3) Resin member Whether the resin member 12 has the flow suppression groove 5 or not, for example, an injection molding method, a press molding method, an extrusion molding method, a pultrusion molding method, an autoclave It can be produced by any known melt molding method such as a molding method. When the resin member 12 has the flow suppression groove 5, the resin member 12 can be integrally formed with the flow suppression groove 5 by transferring the molding surface of the mold used.

  The resin member 12 is made of a polymer and other desired additives. As the polymer, a thermoplastic polymer may be used, or a thermosetting polymer may be used.

As the thermoplastic polymer constituting the resin member 12, any polymer having thermoplasticity can be used. Of these, thermoplastic polymers used in the field of automobiles are preferably used. Specific examples of such thermoplastic polymers include, for example, the following polymers and mixtures thereof:
Polyolefin resins such as polyethylene and polypropylene;
Polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polylactic acid (PLA));
Polyacrylate resins such as polymethyl methacrylate resin (PMMA);
Polyether resins such as polyether ether ketone (PEEK) and polyphenylene ether (PPE);
Polyacetal (POM);
Polyphenylene sulfide (PPS);
PA6, PA66, PA11, PA12, PA6T, PA9T, MXD6 and other polyamide-based resins (PA);
Polycarbonate resin (PC);
Polyurethane resin;
A fluoropolymer resin; and a liquid crystal polymer (LCP).

  The molecular weight of the thermoplastic polymer is not particularly limited as long as it can be softened and melted at the time of joining. Usually, a thermoplastic polymer having a melt flow rate (MFR) of 2 to 200, preferably 2 to 55, is used.

  In the present specification, MFR is a melt flow rate, and a value (g / 10 minutes) measured at 230 ° C. based on JIS K7210 is used.

As the thermosetting polymer, a thermosetting polymer used in the field of automobiles is preferably used. Specific examples of such thermosetting polymers include, for example, the following polymers and mixtures thereof:
Epoxy resin (EP);
Phenolic resin (PF);
Unsaturated polyester resin (UP);
Melamine resin (MF);
Polyurethane (PUR).

  Examples of the additive contained in the resin member 12 include fillers such as talc, and reinforcing fibers such as carbon fibers and glass fibers.

  As described above, the resin member 12 has been described in which the joining portion has a substantially flat plate shape. However, the present invention is not limited to this, and as long as at least the portion immediately below the pressing member has a substantially flat plate shape, the resin member 12 has any shape. Also good. The thickness t of the resin member 12 is not particularly limited, and is usually 1 mm or more, particularly 1 to 20 mm.

  When the resin member 12 has the flow suppression groove 5, as shown in FIG. 7, it is preferable that the resin member 12 thickens at least the region 60 directly below the pressing member from the viewpoint of improving the strength of the resin member 12. The thickness t2 of the thickened portion may be selected within the same range as the thickness t.

(4) Metal member The metal member 11 can be manufactured by any known forming method such as die casting, but is usually available as a commercial product. When the metal member 11 has the flow suppression groove 5, the flow suppression groove 5 can be formed by cutting.

  The metal member 11 will be described in which the joining portion has a substantially flat plate shape. However, the present invention is not limited to this, and may have any shape as long as at least the portion directly below the pressing member has a substantially flat plate shape. . The thickness T of the metal member 11 is not particularly limited, and is usually about 0.6 to 3.0 mm.

As the metal constituting the metal member 11, any metal having a melting point higher than that of the polymer constituting the resin member 12 can be used. Among these, the following metals and alloys used in the automotive field are preferably used:
Aluminum and aluminum alloys such as 5000 series and 6000 series;
Steel; mild steel, high-strength steel, etc. Magnesium and its alloys;
Titanium and its alloys.

(5) Rotating Tool FIG. 10 is an enlarged view of the vicinity of the tip of the rotating tool 16. In FIG. 10, the right half shows the appearance of the rotary tool 16, and the left half shows a cross section. As shown in FIG. 10, the columnar rotary tool 16 has a pin portion 16 a and a shoulder surface 16 b at the distal end portion (lower end portion in FIG. 10). The shoulder surface 16 b is a circular tip surface of the rotary tool 16. The rotary tool 16 has a pin portion 16a on the shoulder surface 16b. The pin portion 16a is a columnar portion having a smaller diameter than the shoulder surface 16b and projecting outward (downward in FIG. 10) from the circular tip surface of the rotary tool 16 on the central axis X of the rotary tool 16. is there. The pin portion 16a is for positioning the rotating tool 16 when the rotating tool 16 that is rotating is first brought into contact with the workpiece 10 and pressed.

  The material of the rotary tool 16 and the dimensions of each part are mainly set according to the metal type of the metal member 11 pressed by the rotary tool 16. For example, when the metal member 11 is made of an aluminum alloy, the rotary tool 16 is made of tool steel (for example, SKD61), the diameter D1 of the shoulder surface 16b is 10 mm, the diameter D2 of the pin portion 16a is 2 mm, and the pin portion 16a protrudes. The length h is set to 0.5 mm. For example, when the metal member 11 is made of steel, the rotary tool 16 is made of silicon nitride, PCBN (cubic boron nitride sintered body), etc., the diameter D1 of the shoulder surface 16b is 10 mm, and the diameter D2 of the pin portion 16a. Is set to 3 mm, and the protruding length h of the pin portion 16a is set to 0.5 mm. Needless to say, these are merely examples, and the present invention is not limited thereto. For example, the diameter of the rotating tool 16 is usually the diameter D1 of the shoulder surface 16b, and is usually 5 to 100 mm, particularly 5 to 20 mm.

(6) Specific example of joining method of metal member and resin member based on friction stir welding method The joining method based on the friction stir welding method according to the present invention includes at least the following steps:
A first step of applying the adhesive 3 to at least one of the metal member 11 or the resin member 12 and superimposing the metal member 11 and the resin member 12; and the metal member 11 while rotating the rotary tool 16 as a pressing member. A second step of generating frictional heat by pressing, softening and melting the resin member 12 with this frictional heat, and solidifying the resin member 12 to join the metal member 11 and the resin member 12.
The metal member 11 and the resin member 12 obtained in the first step are called “work” 10.

First step:
Since the application of the adhesive 3 in the first step is as described above, a description thereof is omitted here.

  After the application of the adhesive 3, the metal member 11 and the resin member 12 are overlapped so that their facing surfaces 110 and 120 face each other, as shown in FIGS. 5 and 9, for example. At this time, the flow of the adhesive 3 to the joining region is suppressed by the inflow of the adhesive 3 into the flow suppression groove 5.

Second step:
In the second step, as shown in FIG. 6, at least a push-in stirring step C2 in which the rotary tool 16 is pushed into the metal member 11 and entered to a depth that does not reach the joining boundary surface 130 between the metal member 11 and the resin member 12 is performed. Do.

In the present invention, in the second step, the shoulder surface 16b (only the tip portion (pin portion and shoulder surface) only) of the rotary tool 16 is in contact with the surface portion of the metal member 11 before the pushing stirring step. Although it is preferable to perform the preheating process C1 which rotates the rotary tool 16, it does not necessarily have to be performed.
After the indentation stirring step, it is preferable to perform the stirring maintenance step C3 in which the rotation operation of the rotary tool 16 is continued at the position where the rotary tool 16 has entered to a depth that does not reach the joining boundary surface. It doesn't have to be.

  Hereinafter, each step will be described in detail.

(Preheating process C1)
In the preheating step C1, the rotating tool 16 and the receiving member 17 are brought close to each other, so that only the pin portion 16a and the shoulder surface 16b (only the tip portion) of the rotating tool 16 are made of metal as shown in FIGS. In this step, the rotary tool 16 is rotated while being in contact with the surface portion (upper surface portion in the example) of the member 11. In the preheating step C1, the rotary tool 16 is rotated at a predetermined rotation speed (for example, 3000 rpm) for a first pressurizing time (for example, 1.00 seconds) with a first pressure (for example, 900 N). 5 and 9 are schematic cross-sectional views when the ZZ cross-section in FIG. 1 is viewed in the direction of the arrow, and are schematic cross-sectional views for explaining a preheating step in the joining method of the present invention.

  Specifically, in the preheating step C <b> 1, frictional heat is generated at the surface portion (upper surface portion in the illustrated example) of the metal member 11 by pressing of the rotary tool 16. The frictional heat is transmitted to the inside of the metal member 11, and the range of the pressing region P of the metal member 11 and the range in the vicinity of the pressing region P are preheated. Thereby, it becomes easy to push the rotary tool 16 into the metal member 11 in the next pushing and stirring step C2. Even if the flow of the adhesive 3 occurs in this step, the flow of the adhesive 3 to the joining region is suppressed by the flow of the adhesive 3 into the flow suppression groove 5.

  In the preheating step C <b> 1, the frictional heat is conducted to the resin member 12 through the boundary surface between the metal member 11 and the resin member 12. When the adhesive contains a thermosetting resin, thermosetting of the adhesive may occur in this step.

  The first pressurizing force and the first pressurizing time in the preheating step C1 are set from the viewpoint of ease of pushing in the rotary tool 16 and the ease of softening / melting of the resin member 12, and values thereof. Varies depending on, for example, the rotational speed of the rotary tool 16, the thickness of the metal member 11, the type of material, and the like. For example, when the aluminum alloy metal member 11 having a thickness of 1 mm or more and 2 mm or less is used, the first pressure in the preheating step C1 is 700 N or more and less than 1200 N, and the first pressurizing time is 0.5 seconds. A value of not less than 2.0 seconds and a rotation speed of the rotary tool is preferably not less than 500 rotations / minute and not more than 10,000 rotations / minute.

(Indentation stirring step C2)
The pushing agitation step C2 is a step of pushing the rotating tool 16 into the metal member 11 as shown in FIG. 6 by bringing the rotating tool 16 and the receiving member 17 close to each other. When the pushing and stirring step C2 is performed after the preheating step C1, the rotating tool 16 and the receiving member 17 are brought closer to each other, thereby pushing the rotating tool 16 into the metal member 11 as shown in FIG. That is, the rotary tool 16 is advanced to a depth that does not reach the boundary surface 130 between the metal member 11 and the resin member 12. As a result, the molten resin is radiated from the region 60 directly below the rotary tool 16 toward the outer peripheral side in the arrow direction K (FIG. 6), that is, from the center of the region 60 directly toward the outer peripheral region 61 in a plan view. To flow.

  Specifically, in the indentation stirring step C2, the rotary tool 16 is moved at a second pressurizing time (for example, 1500 N) that is larger than the first pressurizing time and shorter than the first pressurizing time (for example, Rotate at a predetermined rotation speed (for example, 3000 rpm) for 0.25 seconds.

  In the indentation stirring step C2, the rotating tool 16 is pushed into the metal member 11 when the applied pressure is larger than that in the preheating step C1. That is, the rotary tool 16 enters deep inside the metal member 11. As shown in FIG. 6, by pressing the rotary tool 16, the joint boundary surface 130 between the metal member 11 and the resin member 12 is placed on the support 17 side (lower side in the illustrated example) in the lower portion 115 of the metal member 11. ), And the immediately lower part 115 is projected and deformed toward the resin member 12 side. Also in this manner, the molten resin in the region 60 immediately below the rotary tool on the joining boundary surface 130 in the arrow direction K from the region 60 directly below the rotary tool 16 toward the outer peripheral side in the arrow direction K, that is, in the region 60 directly below. It flows radially from the center toward the outer peripheral region 61. The molten resin spreads in a substantially circular shape centering on the region 60 directly below the rotary tool. The molten resin that flows may flow into the flow suppression groove 5. Even if the flow of the adhesive 3 occurs in this step, the flow of the adhesive 3 to the joining region is suppressed by the flow of the adhesive 3 into the flow suppression groove 5. When the adhesive contains a thermosetting resin, thermosetting of the adhesive may occur in this step.

  If the rotary tool 16 is pushed further (that is, if the applied pressure is too high and / or the pressurizing time is too long), the shoulder surface 16b of the rotary tool 16 exceeds the joint boundary surface. That is, the rotary tool 16 penetrates the metal member 11 and contacts the resin member 12. Then, the metal member 11 is in a holed state in which the hole through which the rotary tool 16 has passed is opened, resulting in poor bonding.

  Therefore, in the present invention, in the indentation stirring step C2, the indentation of the rotation tool 16 is stopped when the shoulder surface 16b of the rotation tool 16 enters a depth that does not reach the joint boundary surface. In other words, the rotary tool 16 is advanced to a depth that does not reach the joint interface. As a result, in the next agitation maintaining step C3, frictional heat is generated at a reference position close to the resin member 12, a large amount of frictional heat is transmitted to the resin member 12, and the melting and flow (movement) of the resin member 12 is promoted. .

  The second pressing force and the second pressurizing time in the indentation stirring step C2 are set from the viewpoint of avoiding the opening of the metal member 11 as described above and the rotating tool 16 as close to the resin member 12 as possible. The value varies depending on, for example, the number of rotations of the rotary tool 16, the thickness of the metal member 11, the type of material, and the like. For example, when the aluminum alloy metal member 11 having a thickness of 1 mm or more and 2 mm or less is used, the second pressing force in the indentation stirring step C2 is a value of 1200 N or more and less than 1800 N, and the second pressurizing time is 0.1. A value of at least 2 seconds and less than 0.5 seconds, and a rotation speed of the rotating tool is preferably at least 500 rotations / minute and not more than 10,000 rotations / minute.

(Stirring maintenance step C3)
The agitation maintaining step C3 stops the mutual proximity of the rotary tool 16 and the receiving member 17 and, as shown in FIG. This is a step of continuing the rotation operation of the rotary tool 16 at the “position”). In the stirring maintaining step C3, the rotary tool 16 is moved to a third pressurizing time (for example, 5.75) longer than the first pressurizing time with a third pressurizing force (for example, 500 N) smaller than the first pressurizing force. Seconds) at a predetermined rotation speed (for example, 3000 rpm).

  In the stirring maintaining step C3, the rotating tool 16 is maintained at the reference position by the applied pressure being smaller than that of the preheating step C1 (of course, being smaller than that of the pushing stirring step C2). Since the rotary tool 16 continues to rotate at the reference position close to the resin member 12, a large amount of frictional heat is generated, and most of the generated frictional heat moves to the resin member 12. Therefore, the resin member 12 is sufficiently softened and melted in a wide range beyond the range of the region 60 directly below the pressing region P, and more effectively in the arrow direction K in plan view, directly below the rotary tool 16. It flows and moves radially from the region 60 toward the outer peripheral side, that is, from the center of the region 60 directly below to the outer peripheral region 61. Even if the flow of the adhesive 3 occurs in this step, the flow of the adhesive 3 to the joining region is suppressed by the flow of the adhesive 3 into the flow suppression groove 5. When the adhesive contains a thermosetting resin, thermosetting of the adhesive may occur in this step.

  The third pressurizing force and the third pressurizing time in the stirring maintaining step C3 are set from the viewpoint of sufficient softening and melting of the resin member 12 as described above, and the values thereof are, for example, the rotary tool 16. Depending on the number of rotations, the thickness of the metal member 11, the type of material, and the like. For example, when the aluminum alloy metal member 11 having a thickness of 1 mm or more and 2 mm or less is used, the third pressing force in the stirring maintaining step C3 is a value of 100 N or more and less than 700 N, and the third pressurizing time is 1.0. A value of not less than 10 seconds and less than 10 seconds and a rotation speed of the rotary tool are preferably not less than 500 rotations / minute and not more than 10,000 rotations / minute.

(Holding process C4)
After the indentation stirring step C2 or the stirring maintaining step C3, a holding step C4 is performed in which the rotation of the rotary tool 16 is stopped and the rotary tool 16 is held at a predetermined pressure for a predetermined pressurizing time. Also good.
Similarly, as shown in FIG. 6, the holding step C <b> 4 is a step in which the rotation of the rotary tool 16 is stopped and the rotary tool 16 is held for a predetermined time with a predetermined pressure in that state. In the holding step C4, the rotary tool 16 is moved at a fourth pressure force (for example, 1000 N) that is larger than the third pressure force but smaller than the second pressure force and shorter than the third pressurization time but the second pressure force. Hold for a fourth pressurization time (for example, 5.00 seconds) longer than the pressure time.

  In the holding step C4, the rotation of the rotary tool 16 is stopped, whereby the generation of frictional heat is completed. That is, the substantial operation as the friction stir welding is finished, and cooling of the workpiece 10 is started. During the cooling period of the workpiece 10, the rotating tool 16 whose rotation is stopped due to the pressure force being smaller than the indentation stirring step C 2 but larger than the stirring maintaining step C 3 is the metal member 11, the resin member 12, and the receiving member 17. And clamp between. Thereby, the adhesive force during cooling between the metal member 11 and the resin member 12 is increased, and the bonding strength after the completion of cooling and solidification is increased.

  The fourth pressurizing force and the fourth pressurizing time in the holding step C4 are set from the viewpoint of improving the adhesion strength of the pressing region P during the cooling period as described above, and the values thereof are, for example, those of the material of the metal member 11 It varies depending on the type. For example, when the aluminum alloy metal member 11 is used, the fourth pressing force in the holding step C4 is preferably a value of 700 N or more and less than 1200 N, for example. The fourth pressurization time is preferably, for example, a value of 1 second or longer.

  In the present invention, at least through the above-described steps C2, preferably through the above-described steps C1 and C2, more preferably through the above-described steps C1 to C3, and most preferably through the above-described steps C1 to C4, finally. In addition, a joined body 20 of the metal member 11 and the resin member 12 in which the metal member 11 and the resin member 12 are joined with high strength in a wide range is obtained.

  After performing a predetermined process in the second step, cooling is usually performed to solidify the molten resin. The cooling method is not particularly limited, and examples thereof include a standing cooling method.

  After performing the predetermined process in the second step, the adhesive 3 may be thermally cured before or after cooling. The thermosetting temperature may be appropriately determined according to the curing temperature of the adhesive 3.

(7) Bonded Body As shown in FIG. 12, the bonded body of the metal member 11 and the resin member 12 bonded by the bonding method of the present invention is a bonded area in the region 60 directly below the rotary tool of the resin member 12 and its outer peripheral region. The metal member 11 and the resin member 12 are joined to each other. This can be detected by confirming that the melted and solidified region obtained by solidifying the molten resin spreads out in a substantially circular shape centering on the region 60 directly below the rotary tool at the joint interface of the joined body. 12 is a schematic plan view of a resin member obtained by forcibly peeling a metal member from a joined body obtained by the joining method according to one embodiment of the present invention using the resin member of FIG. .

  Specifically, when the metal member 11 is forcibly separated from the joined body, for example, a contact surface 122a of the resin member 12 with the metal member 11 as shown in FIG. 12 can be observed. Such a contact surface 122a (melting and solidifying region) of the resin member 12 is composed of a resin melting region 131A (shaded region) in the region 60 immediately below the rotary tool and a molten resin flow region 132A (lattice region) in the outer peripheral region. ing.

  The resin melting region 131 </ b> A has a concave shape with a diameter substantially equal to the diameter of the rotating tool due to the protruding deformation of the metal member 11 on the surface thereof. Further, since the minute shape on the surface of the metal member 11 is transferred and may be discolored depending on the bonding strength, it is visually confirmed by comparison with the surface properties (surface roughness, color, etc.) of the original resin member 12. Recognition is easily possible.

  Since the fine shape of the surface of the metal member 11 is transferred to the surface of the molten resin flow region 132A and the color may be changed depending on the bonding strength, the surface properties (surface roughness, color, etc.) of the original resin member 12 may be changed. By comparison with others, visual recognition is easily possible.

  As shown in FIG. 12, the adhesive 3 flows into the flow suppression groove 5, and the molten resin may also flow in.

[Example 1]
(Resin member)
With a flow control groove 5 having an elliptical shape as shown in FIG. 4 in a plan view by injection molding using polypropylene pellets (PP-CF40-11; manufactured by Daicel Polymer Co., Ltd.) containing 40% by weight of carbon fiber A resin member 12 was produced. The flow suppression groove 5 was formed by transferring the molding surface of a mold used in the injection molding method.
The dimensions of the resin member 12 were as follows (see FIG. 4):
Overall dimensions: 100mm length x 60mm width
Width W1 (constant) of the flow suppression groove 5 = 1 mm;
The depth t1 of the flow suppression groove 5 = 1 mm;
Major axis dL = 30 mm of the inner boundary line 51 (elliptical shape) of the flow suppression groove 5;
Minor axis ds of inner boundary line 51 (elliptical shape) of flow suppression groove 5 = 30 mm;
Thickness t = 3 mm;
The distance L1 between the flow suppression groove 5 and the region P ′ immediately below the pressing member is 10 mm.

(Metal member)
As the metal member 11, a flat plate member made of 6000 series aluminum alloy was used.
The dimensions of the metal member 11 were as follows:
Overall dimensions: Length 100mm x Width 60mm x Thickness (T) (Junction) 1.2mm

(Rotation tool)
As the rotating tool, a tool tool having dimensions of D1 = 10 mm, D2 = 2 mm, and h = 0.25 mm in each part of FIG. 10 was used.

(Joining method)
The joined body of the metal member 11 and the resin member 12 was manufactured by the following method.
First step:
As shown in FIG. 1 and FIG. 4, the adhesive 3 (epoxy resin; BF9050L; Dow) is formed along the outer boundary line 52 defining the flow suppression groove 5 on the formation surface 120 of the flow suppression groove 5 in the resin member 12. (Chemical Co., Ltd.) was applied in a linear form (bead form) so that the thickness of the adhesive layer 3 after joining was 0.2 mm (application amount 100 mg / m ² ). Distance (constant) between the flow suppression groove 5 and the application region of the adhesive 3 L2 = 5 mm. The metal member 11 and the resin member 12 were superposed as shown in FIG.

Second step:
In plan view, the center of the region P ′ (see FIG. 4) on the surface of the resin member 12 corresponding to the region immediately below the pressing region P (see FIG. 1) of the rotary tool 16 on the metal member 11 is the inner side of the flow suppressing groove 5. The rotating tool 16 was pushed into the metal member 11 so as to overlap with the midpoint of the two focal points in the elliptical shape of the boundary line 51 (= the origin of the xy coordinates).
Specifically, as shown in FIG. 5, the rotary tool 16 is pressed in a state where only the pin portion 16 a of the rotary tool 16 is pushed into the metal member 11 and the shoulder surface 16 b of the rotary tool 16 is in contact with the surface portion of the metal member 11. It was rotated (preheating step C1: pressing force 900 N, pressurizing time 1.00 seconds, tool rotation speed 3000 r).
Next, as shown in FIG. 6, the rotary tool 16 is further pushed into the metal member 11 to a depth that does not reach the joining boundary surface 130 between the metal member 11 and the resin member 12 (pushing stirring step C2: applied pressure 1500 N). , Pressurization time 0.25 seconds, tool rotation speed 3000 rpm).
Next, as shown in FIG. 6, the rotation operation of the rotary tool 16 was continued at a position where the rotary tool 16 was advanced to a depth that did not reach the joining boundary surface 130 (stirring maintenance step C3: pressurizing force 500 N, pressurization) Time 5.75 seconds, tool rotation speed 3000 rpm).
Next, the rotary tool 16 was extracted from the metal member 11 and heated to 80 ° C. to cure the adhesive 3.
Finally, it was left to cool.

(Joint strength)
The joined body in which the metal member and the resin member were joined by a method defined in JIS Z 3136 was pulled in the direction indicated by arrows Y-Y in FIG. 1, and a shear tensile test was performed. Evaluation was based on the shear strength S.
A: 5.0 kN ≦ S (excellent);
○: 3.0 kN ≦ S <5.0 kN (good);
Δ: 1.0 kN ≦ S <3.0 kN (no problem in practical use);
X: S <1.0 kN (problem in practical use).

(Workability)
In the examples, the workability was evaluated according to the following criteria according to the achievement degree of reduction of the area in the inner boundary line defining the flow suppression groove, and the highest rank was shown.
A: ds / D1 ≦ 2 and dL / D1 ≦ 4;
○: ds / D1 ≦ 3 and dL / D1 ≦ 5;
Δ: ds / D1 ≦ 4 and dL / D1 ≦ 6;
X: 4 <ds / D1 or 6 <dL / D1.

(Comprehensive evaluation)
Of the evaluation results of the bonding strength and the evaluation results of workability, the lower evaluation result was used as the comprehensive evaluation result.

[Examples 2 to 8 and Comparative Example 1]
In the resin member, the metal member and the resin member were joined and evaluated by the same method as in Example 1 except that the dimension of the elliptical shape as the planar shape of the flow suppression groove 5 was changed as shown in the table. It was.
The resin member used in Comparative Example 1 does not have a flow suppression groove.

  The evaluation results of the bonding strength and the evaluation results of workability are shown in the graph of FIG. In the graph, the plotted evaluation results are based on the bonding strength, and the results represented by the area with bold lines are based on the workability.

  The joining method according to the present invention is useful for joining a metal member and a resin member in the fields of automobiles, railway vehicles, aircraft, home appliances, and the like.

1: Friction stir welding device 3: Adhesive 5: Flow suppression groove 10: Workpiece 11: Metal member 12: 12 ′: 12 ″: Resin member 16: Rotating tool 17: Receiving tool 20: Joined body 120: Resin member Surface on the joining side with the metal member P: Pressing area (scheduled pressing area) by the rotating tool on the metal member
P ′: a region on the surface of the resin member corresponding to directly below the pressing region P

Claims (20)

A thermo-pressure type in which an adhesive is applied between the metal member and the resin member, and the resin member is melted by applying pressure and heat from the metal member side to melt and joining the metal member and the resin member. A joining method between a metal member and a resin member by a joining method,
At least one of the surface of the resin member facing the metal member or the surface of the metal member facing the resin member is formed with a flow suppression groove that suppresses the flow of the adhesive to the bonding region in the overlapped state. Has been
The pressure is applied by a pressing member,
The flow suppression groove is formed in an annular shape around a region immediately below the pressing member,
The joining method of the metal member and the resin member , wherein the inner boundary line defining the annular flow suppressing groove has a ring shape and dimensions that can be expressed in the following region :
The maximum width (diameter) of the pressing member is D1, and an ellipse Es having a minor axis = 1.5 × D1 and a major axis = 2.5 × D1, and an ellipse Eb having a minor axis = 3 × D1 and a major axis = 5 × D1. , An area formed between the ellipse Es and the ellipse Eb when expressed with the midpoint between the two focal points of each ellipse as the origin on the xy coordinates. A thermo-pressure type in which an adhesive is applied between the metal member and the resin member, and the resin member is melted by applying pressure and heat from the metal member side to melt and joining the metal member and the resin member. A joining method between a metal member and a resin member by a joining method,
At least one of the surface of the resin member facing the metal member or the surface of the metal member facing the resin member is formed with a flow suppression groove that suppresses the flow of the adhesive to the bonding region in the overlapped state. Has been
The pressure is applied by a pressing member,
The flow suppression groove is formed in an annular shape around a region immediately below the pressing member,
The joining method of the metal member and the resin member , wherein the inner boundary line defining the annular flow suppressing groove has an elliptical shape and dimensions that can be expressed in the following region :
The maximum width (diameter) of the pressing member is D1, and an ellipse Es having a minor axis = 1.5 × D1 and a major axis = 2.5 × D1, and an ellipse Eb having a minor axis = 3 × D1 and a major axis = 5 × D1. , An area formed between the ellipse Es and the ellipse Eb when expressed with the midpoint between the two focal points of each ellipse as the origin on the xy coordinates. The pressing member, the center of the pressing area of the surface of the metal member by the pressing member, in plan view, so as to overlap the origin of the x-y coordinate, to press the metal member, according to claim 1 or 2 Joining method of metal member and resin member. The flow suppressing groove has a width of 0.01 × D1~0.5 × D1, method of joining the metal member and the resin member according to any one of claims 1 to 3. The flow suppressing grooves have a depth of 0.01 × D1~0.5 × D1, method of joining the metal member and the resin member according to any one of claims 1 to 4. The hot-pressure bonding method is a friction stir welding method,
The method for joining a metal member and a resin member according to any one of claims 1 to 5 , wherein the friction stir welding method includes the following steps:
A first step of superimposing the metal member and the resin member; and while rotating a rotary tool as a pressing member, the metal member is pressed to generate frictional heat, and the resin member is melted by the frictional heat. And then solidifying and joining the metal member and the resin member. A thermo-pressure type in which an adhesive is applied between the metal member and the resin member, and the resin member is melted by applying pressure and heat from the metal member side to melt and joining the metal member and the resin member. A joining method between a metal member and a resin member by a joining method,
The hot press bonding method is a friction stir welding method,
The friction stir welding method includes the following steps:
A first step of superimposing the metal member and the resin member; and
While rotating the rotary tool as a pressing member, the metal member is pressed to generate frictional heat, the resin member is melted by the frictional heat, and then solidified to join the metal member and the resin member. 2 steps
Including
At least one of the surface of the resin member facing the metal member or the surface of the metal member facing the resin member is formed with a flow suppression groove that suppresses the flow of the adhesive to the bonding region in the overlapped state. A joining method of a metal member and a resin member. The said flow suppression groove | channel is the joining method of the metal member and resin member in any one of Claims 1-7 which suppresses the flow to the joining area | region of the said adhesive agent at the time of the said superimposition and the said joining. The joining method of the metal member and resin member in any one of Claims 1-8 with which the said flow suppression groove suppresses the said flow, when the said adhesive agent flows in into the said flow suppression groove. The pressure is applied by a pressing member,
The flow suppressing grooves is at least in plan view, the region immediately below the pressing member and is positioned between the coating region of the adhesive, and the metal member and a resin member according to any one of claims 1-9 Joining method. The pressure is applied by a pressing member,
The flow suppression groove is formed in an annular shape around a region immediately below the pressing member,
Inner boundary defining the flow suppressing the annular groove has an annular shape and dimensions can be represented within the following ranges, method of joining the metal member and the resin member according to any of claims 7-10:
The maximum width (diameter) of the pressing member is D1, and an ellipse Es having a minor axis = 1.5 × D1 and a major axis = 2.5 × D1, and an ellipse Eb having a minor axis = 3 × D1 and a major axis = 5 × D1. , An area formed between the ellipse Es and the ellipse Eb when expressed with the midpoint between the two focal points of each ellipse as the origin on the xy coordinates. The pressure is applied by a pressing member,
The flow suppression groove is formed in an annular shape around a region immediately below the pressing member,
The method for joining a metal member and a resin member according to any one of claims 7 to 11 , wherein an inner boundary line defining the annular flow suppression groove has an elliptical shape and dimensions that can be expressed in the following region:
The maximum width (diameter) of the pressing member is D1, and an ellipse Es having a minor axis = 1.5 × D1 and a major axis = 2.5 × D1, and an ellipse Eb having a minor axis = 3 × D1 and a major axis = 5 × D1. , An area formed between the ellipse Es and the ellipse Eb when expressed with the midpoint between the two focal points of each ellipse as the origin on the xy coordinates. The pressing member, the center of the pressing area of the surface of the metal member by the pressing member, in plan view, so as to overlap the origin of the x-y coordinate, to press the metal member, according to claim 11 or 12 Joining method of metal member and resin member. The flow suppressing groove has a width of 0.01 × D1~0.5 × D1, method of joining the metal member and the resin member according to any one of claims 11 to 13. The flow suppressing grooves have a depth of 0.01 × D1~0.5 × D1, method of joining the metal member and the resin member according to any one of claims 11 to 14. 8. The metal according to claim 6 , wherein the second step includes a pushing stirring step of pushing the rotating tool into the metal member to enter a depth that does not reach a boundary surface between the metal member and the resin member. A method of joining a member and a resin member. The second step is, before the pushing stirring step, wherein the shoulder surface of the rotary tool to the metal member according to claim 16, in a state in contact with the surface portion further comprises a preheating step of rotating the rotating tool Joining method of metal member and resin member. In the preheating step, the rotary tool is rotated by a first pressurizing time while being pressed with a first pressing force,
Wherein the pushing stirring step of claim 17 is rotated only between the rotary tool is shorter than between the pressed while the first pressurization in the first pressure is greater than the second pressure second pressurization A method of joining a metal member and a resin member. The second step further comprises an agitation maintaining step of continuing the rotation operation of the rotary tool at a position where the rotary tool has entered to a depth that does not reach the boundary surface,
Wherein the agitation maintains process of claim 18 which rotates only between the rotating the tool first longer than between the first pressurization while pressing under a pressure less than the third pressure third pressurization A method of joining a metal member and a resin member. The said 2nd step is further equipped with the holding process which stops rotation of the said rotation tool after a stirring maintenance process, and hold | maintains the said rotation tool with a predetermined pressurizing force for a predetermined pressurization time in the state. 19. A method for joining the metal member and the resin member according to 19 .

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