JP6319341B2 - Method of joining metal member and resin member, and joining member set comprising metal member and 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 joining member set including a metal member and a resin member used in the method.

  Conventionally, weight reduction is required in the fields of automobiles, railway vehicles, airplanes, and the like. For example, in the field of automobiles, the use of high-tensile materials has made it possible to make steel sheets thinner, aluminum alloy materials have been used as substitutes for steel materials, and resin materials have also been increasingly used. In these fields, development of joining technology for metal members and resin members is important not only for reducing the weight of the car body, but also for increasing the strength and rigidity of the joining members and improving productivity. is there. So far, a so-called friction stir welding (FSW) method has been proposed as a method for joining a metal member and a resin member. As shown in FIG. 13, the friction stir welding method is a method in which a flat metal member 211 and a flat resin member 212 are overlapped as they are and pressed against the metal member 211 while rotating the rotary tool 216 to generate frictional heat. In this method, the resin member 212 is melted by the frictional heat and then solidified to join the metal member 211 and the resin member 212 (Patent Document 1).

  Moreover, in the friction stir welding method, a technique for bonding with high strength by using a resin member having a functional group as the resin member is disclosed (Patent Document 2).

JP 2010-158885 A JP 2014-208461 A

  In the conventional friction stir welding method, the inventors of the present invention, when a joined body obtained by using a flat metal member and a flat resin member as they are is used as a member in an automobile body, the manufacturing process (paint drying) In the furnace, the maximum temperature is 180 ° C.) and in the severe use environment of the car (for example, extremely cold region and scorching region), as shown in FIG. 14, due to the difference in thermal expansion coefficient between the metal member 211 and the resin member 212, the joint portion It was found that shear stress (211 ′ and 212 ′) was generated in 213, and the joint strength in the shear direction might be insufficient.

  An object of this invention is to provide the joining method of the metal member and resin member which joint strength in a shear direction fully improves.

The present invention
Thermo-pressure bonding in which a metal member and a resin member are superposed, pressure is applied to the resin member by pressing from the metal member side by the pressing member, and the resin member is softened and melted by heat, and then solidified and bonded. A method of joining a metal member and a resin member by a method,
On each of the mutual contact surfaces of the metal member and the resin member, a fitting formation portion for fitting the metal member and the resin member is provided,
The present invention relates to a joining method between a metal member and a resin member, in which the metal member and the resin member are joined together by the fitting forming portion.

  The present invention also relates to a joining member set including a metal member and a resin member used in the joining method of the metal member and the resin member.

  According to the joining method according to embodiments I and II described later of the present invention, the joining strength in the shear direction can be sufficiently improved.

It is a schematic diagram 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 an enlarged view of the front-end | tip part of an example of the rotation tool as a press member used for the joining method of this invention. While showing the schematic sectional drawing of an example of the joining member set which consists of a metal member and resin member used for the joining method concerning embodiment I-1 of the present invention, for explaining an example of the preheating process in the joining method concerned It is a schematic sectional drawing. It is a schematic sectional drawing for demonstrating an example of the pushing stirring process, the stirring maintenance process, and the holding | maintenance process in the joining method which concerns on embodiment I-1 using the joining member set shown to FIG. 3A. While showing the schematic sectional drawing of an example of the joining member set which consists of a metal member and resin member which are used for the joining method concerning embodiment I-2 of the present invention, for explaining an example of the preheating process in the joining method concerned It is a schematic sectional drawing. It is a schematic sectional drawing for demonstrating an example of the pushing stirring process in the joining method which concerns on embodiment I-2 using the joining member set shown to FIG. 4A, a stirring maintenance process, and a holding process. While showing the schematic sectional drawing of an example of the joining member set which consists of a metal member and resin member which are used for the joining method concerning embodiment I-3 of the present invention, for explaining an example of the preheating process in the joining method concerned It is a schematic sectional drawing. It is a schematic sectional drawing for demonstrating an example of the pushing stirring process, the stirring maintenance process, and the holding process in the joining method which concerns on embodiment I-3 using the joining member set shown to FIG. 5A. While showing the schematic sectional drawing of an example of the joining member set which consists of a metal member and resin member used for the joining method concerning embodiment II-1 of the present invention, for explaining an example of the preheating process in the joining method concerned It is a schematic sectional drawing. It is a schematic sectional drawing for demonstrating an example of an indentation stirring process, a stirring maintenance process, and a holding process in the joining method which concerns on embodiment II-1 using the joining member set shown to FIG. 6A. While showing the schematic sectional drawing of an example of the joining member set which consists of a metal member and resin member which are used for the joining method concerning embodiment II-2 of the present invention, for explaining an example of the preheating process in the joining method concerned It is a schematic sectional drawing. It is a schematic sectional drawing for demonstrating an example of the indentation stirring process, stirring maintenance process, and holding process in the joining method which concerns on embodiment II-2 using the joining member set shown to FIG. 7A. While showing the schematic sectional drawing of an example of the joining member set which consists of a metal member and resin member used for the joining method concerning embodiment II-3 of the present invention, for explaining an example of the preheating process in the joining method concerned It is a schematic sectional drawing. It is a schematic sectional drawing for demonstrating an example of the pushing stirring process, the stirring maintenance process, and the holding | maintenance process in the joining method which concerns on embodiment II-3 using the joining member set shown to FIG. 8A. Schematic diagram of a resin member when the metal member is forcibly peeled from the joined body obtained by the joining method according to Embodiment I-1 of the present invention, and the contact surface of the resin member with the metal member is observed from the front. It is. It is a schematic diagram of a resin member when a metal member is forcibly separated from a joined body obtained by an example of a joining method of the present invention, and a contact surface of a resin member with a metal member is observed from the front. It is a schematic diagram of a resin member when a metal member is forcibly separated from a joined body obtained by an example of a joining method of the present invention, and a contact surface of a resin member with a metal member is observed from the front. It is the schematic for demonstrating the measuring method of the joining strength of the shear direction in an Example. It is this schematic sketch for demonstrating the joining method of the metal member and resin member in a prior art. It is a schematic sectional drawing for demonstrating the mechanism in which the joint strength of a shear direction falls in a prior art.

  In the joining method of the present invention, a metal member and a resin member are overlapped, pressure is applied to the resin member by pressing from the metal member side by the pressing member, and the resin member is softened and melted by heat and then solidified. The present invention relates to a hot-pressure bonding method for performing bonding. The joining method employed in the joining method of the present invention is not particularly limited as long as it is a method of joining by applying pressure locally while applying heat. For example, a friction stir welding method, ultrasonic A heat bonding method, a laser heat bonding method, a resistance heat bonding method, an induction heat bonding method, or the like may be used. A method of applying heat and pressure locally from the metal member side is preferable, and a friction stir welding method is more preferably used.

  As will be described in detail later, the friction stir welding method is a method in which a metal member and a resin member are overlapped and a rotating tool as a pressing member is rotated to press the metal member to generate frictional heat. In this method, the resin member is softened and melted by heat and then solidified to join the metal member and the resin member.

  The ultrasonic heating joining method is a resin member / metal member produced by superposing a metal member and a resin member, causing ultrasonic vibrations to the pressing member and the resin member while pressing the metal member with the pressing member, and the vibration. In this method, the resin member is softened and melted by the frictional heat, and then solidified to join the metal member and the resin member.

  The laser heating joining method is a method in which a metal member and a resin member are overlapped, heat is generated by irradiating the metal member with a laser in a state where the metal member is pressed by the pressing member, and the resin member is softened by this heat. Further, after melting, the metal member and the resin member are joined by solidifying. As the laser, a YAG laser, a fiber laser, a semiconductor laser, or the like is used.

  The resistance heating bonding method is a method in which a metal member and a resin member are overlapped, and the resin member is softened by using heat generated by passing a current directly through the metal member in a state where the metal member and the resin member are constrained by pressurization by the pressing member. In this method, after melting, the metal member and the resin member are joined by solidification. The resin member used in this method is preferably a resin member made of carbon fiber reinforced resin.

  The induction heating joining method is a method in which a metal member and a resin member are overlapped, and an induction current is generated in the metal member by electromagnetic induction while the metal member and the resin member are constrained by pressure applied by the pressing member, and heat generated by the current is used. Then, after the resin member is softened and melted, it is solidified to join the metal member and the resin member.

  Hereinafter, the joining method of the present invention employing the friction stir welding method will be described in detail with reference to the drawings. However, as long as the metal member and the resin member described below are used in a fitted state, the other joining methods described above are used. It is clear that the effects of the present invention can be obtained. It should be noted that the various elements shown in the drawings are merely schematically shown for understanding of the present invention, and the dimensional ratio, appearance, and the like may differ from the actual ones. The “vertical direction” used directly or indirectly in this specification corresponds to a direction corresponding to the vertical direction in the drawing. Unless otherwise specified, in these drawings, common reference numerals indicate the same members, parts, dimensions, or regions.

<Method of joining metal member and resin member by friction stir welding method>
The joining method (friction stir welding method) of the present invention will be specifically described with reference to the drawings.

[1] Joining Device First, FIG. 1 is a diagram schematically showing an example of a part of a friction stir welding device 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 that friction stir welds a metal member 11 and a resin member 12, and includes a cylindrical rotary tool 16.

  As shown in the figure, 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, by a drive source (not shown) as indicated by an arrow A1. While rotating around the central axis X (see FIG. 2), the metal member 11 is pressed downward in the pressing area P (scheduled pressing area) as indicated by an arrow A2. Friction heat is generated by the pressing of the rotary tool 16, and the friction heat is conducted to the resin member 12 to soften and melt the resin member 12, and then the molten resin is solidified. As a result, the metal member 11 and the resin member 12 are joined.

  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.

[2] Rotating Tool FIG. 2 is an enlarged view of the tip portion of the rotating tool 16. In FIG. 2, the right half shows the appearance of the rotary tool 16, and the left half shows a cross section. As shown in FIG. 2, the columnar rotary tool 16 has a pin portion 16 a and a shoulder portion 16 b at the distal end portion (lower end portion in FIG. 2). The shoulder portion 16 b is a portion at the tip of the rotary tool 16 including the circular tip surface of the rotary tool 16. The pin portion 16a is a cylindrical portion having a smaller diameter than the shoulder portion 16b, which protrudes outwardly (downward in FIG. 2) 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 portion 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) or the like, the diameter D1 of the shoulder portion 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 D1 of the shoulder portion 16b is usually 5 to 30 mm, preferably 5 to 15 mm, but is not limited thereto.

[3] Metal Member and Resin Member As shown in FIGS. 3A, 4A, 5A, 6A, 7A, and 8A (hereinafter sometimes referred to as “FIG. 3A etc.”), the metal member 11 is a resin member 12. The contact surface 110 with the metal member 11 has a fitting formation portion 111 for fitting with the resin member 12, and the resin member 12 is fitted with the metal member 11 on the contact surface 120 with the metal member 11. It has a combined part 121. A fitting formation part means the member for forming fitting. In this invention, since it joins in the state which made the metal member and the resin member fit by such a fitting formation part, the joining strength of a shear direction improves. The shear direction means any direction in the interface between the metal member and the resin member.

  The metal member fitting formation portion 111 and the resin member fitting formation portion 121 may have any shape as long as they can be fitted to each other. For example, one of the fitting formation portion 111 of the metal member or the fitting formation portion 121 of the resin member has a convex shape, a concave shape, or a composite shape thereof, and the other is in the shape of the one fitting formation portion. It has a corresponding complementary shape. The complementary shape corresponding to the shape of the one fitting formation portion is a shape that can be fitted with the one fitting formation portion, for example, with an appropriate clearance. The clearance is appropriately set to a level at which the members can be overlapped. For example, when one fitting formation part has a convex shape, the other fitting formation part has a concave shape. Specific examples of the convex shape include columnar shapes such as a columnar shape, an elliptical columnar shape, and a polygonal columnar shape (such as a quadrangular columnar shape). The concave shape includes a concave shape that complementarily corresponds to the specific shape of the convex shape.

  Hereinafter, the metal member and the resin member will be described in more detail with reference to Embodiment I and Embodiment II.

(Regarding Embodiment I)
In the embodiment I, the fitting forming portion 111 of the metal member 11 has a convex shape, and the fitting forming portion 121 of the resin member 12 corresponds to the shape of the fitting forming portion 111 of the metal member 11 in a complementary manner. Embodiments having a shape (eg, FIGS. 3A, 4A and 5A). In these drawings, the fitting forming portion 111 of the metal member 11 has a cylindrical convex shape in particular, but is not limited to this as long as it has a convex shape.

  In the embodiment I, the width of the convex fitting formation portion 111 of the metal member 11 (for example, the diameter when the fitting formation portion 111 has a cylindrical convex shape) d and the width of the pressing member (for example, the diameter of the rotary tool 16). ) For D1, when d = D1, this corresponds to embodiment I-1 shown in FIG. 3A, when d> D1, this corresponds to embodiment I-2 shown in FIG. 4A, and when d <D1, FIG. This corresponds to the embodiment I-3 shown in FIG. Unless stated otherwise, embodiment I shall mean including embodiments I-1 to 1-3. Embodiments I-1 to I-3 are the same as each other except that the size of the fitting formation portion of the metal member 11 (the width of the convex portion, particularly the diameter of the cylindrical convex portion) is different.

In the embodiment I, the height h of the fitting forming portion 111 of the metal member 11 is not particularly limited as long as the joining strength in the shear direction is improved. The height h normally satisfies the following relational expression (i-1) for the thickness T of the metal member 11. The height h preferably satisfies the following relational expression (i-2) and more preferably satisfies the following relational expression (i-3) from the viewpoint of resin welding to the lower surface of the metal member convex portion. :
0.1 × T ≦ h ≦ 2 × T (i−1);
0.2 × T ≦ h ≦ 1 × T (i-2);
0.3 * T <= h <= 0.6 * T (i-3). )
In addition, h is generally less than t and 0.5 mm or more while satisfying the above relational expression.

In Embodiment I, the width (for example, the diameter when the fitting formation portion 111 has a cylindrical convex shape) d of the metal member 11 is not particularly limited as long as the joint strength in the shearing direction is improved. The width (for example, diameter) d of the fitting formation portion 111 normally satisfies the following relational expression (ii-1) with respect to the width (for example, the diameter of the rotating tool) D1 of the pressing member. The d preferably satisfies the following relational expression (ii-2) and more preferably satisfies the following relational expression (ii-3) from the viewpoint of further improving the joint strength in the shear direction.
0.4 × D1 ≦ d ≦ 3 × D1 (ii-1);
0.5 × D1 ≦ d ≦ 2 × D1 (ii-2);
1.1 × D1 ≦ d ≦ 1.8 × D1 (ii-3). )
Note that d is generally 5 mm or more while satisfying the above relational expression.

  In the embodiment I, the thickness T of the metal member 11 and the thickness t of the resin member 12 described later are not particularly limited.

(Regarding Embodiment II)
In the embodiment II, the fitting forming portion 121 of the resin member 12 has a convex shape, and the fitting forming portion 111 of the metal member 11 corresponds to the shape of the fitting forming portion 121 of the resin member 12 in a complementary manner. Embodiments having a shape (eg, FIGS. 6A, 7A and 8A). In these drawings, the fitting forming portion 121 of the resin member 12 has a columnar convex shape in particular, but is not limited to this as long as it has a convex shape.

  In the embodiment II, the width (for example, the diameter when the fitting forming portion 121 has a cylindrical convex shape) d ′ and the width of the pressing member (for example, the rotating tool 16 of the rotary tool 16) are formed. For diameter D1, when d ′ = D1, this corresponds to embodiment II-1 shown in FIG. 6A, and when d ′> D1, this corresponds to embodiment II-2 shown in FIG. 7A, and d ′ <D1. Corresponds to embodiment II-3 shown in FIG. 8A. Unless otherwise specified, embodiment II is intended to include embodiments II-1 to II-3. Embodiments II-1 to II-3 are the same except that the dimensions (the width of the convex portion, particularly the diameter of the cylindrical convex portion) of the resin member 12 are different.

In the embodiment II, the height h ′ of the fitting forming portion 121 of the resin member 12 is not particularly limited as long as the bonding strength in the shear direction is improved. The height h ′ normally satisfies the following relational expression (iii-1) for the thickness T of the metal member 11. The height h ′ preferably satisfies the following relational expression (iii-2), and more preferably satisfies the following relational expression (iii-3), from the viewpoint of the amount of indentation of the tool:
0.1 × T ≦ h ′ ≦ T−0.5 (iii-1);
0.2 × T ≦ h ′ ≦ T−1.0 (iii-2);
0.3 * T <= h '<= T-1.5 (iii-3).

In the embodiment II, the width (for example, the diameter when the fitting forming portion 121 has a cylindrical convex shape) d ′ of the resin member 12 is not particularly limited as long as the joining strength in the shear direction is improved. . The width (for example, diameter) d ′ of the fitting forming portion 121 normally satisfies the following relational expression (iv-1) for the width (for example, the diameter of the rotating tool) D1 of the pressing member. The d ′ preferably satisfies the following relational expression (iv-2) and more preferably satisfies the following relational expression (iv-3) from the viewpoint of further improving the joint strength in the shear direction.
0.4 × D1 ≦ d ′ ≦ 3 × D1 (iv-1);
0.5 × D1 ≦ d ′ ≦ 2 × D1 (iv-2);
1.1 × D1 ≦ d ′ ≦ 1.8 × D1 (iv-3). )
Note that d ′ is generally approximately 5 mm or more while satisfying the above relational expression.

  In the embodiment II, the thickness T of the metal member 11 and the thickness t of the resin member 12 described later are not particularly limited.

(About Embodiment I and Embodiment II)
Among the embodiments described above, preferred embodiments from the viewpoint of further improving the joint strength in the shear direction are Embodiment I (Embodiments I-1, I-2, I-3) and Embodiment II-2, Aspects I-1 and I-2. In these embodiments, shear fracture at the fitting forming portion having a convex shape is sufficiently suppressed.

  Preferred embodiments from the viewpoint of further improving the bonding strength in the shear direction and securing the peel direction (welding area) are Embodiment I, particularly Embodiments I-1 and I-2, and more preferably Embodiment I-2. It is. In these embodiments, due to the presence of the fitting forming portion 111 having a convex shape in the metal member 11, the heat capacity of the metal member is increased. For this reason, overheating of the resin on the surface of the resin member in the region immediately below the rotary tool 16 is suppressed, and decomposition of the molten resin is sufficiently suppressed.

  3A, FIG. 4A, FIG. 5A, FIG. 6A, FIG. 7A, and FIG. 8A, the metal member 11 is the same except that the shape and dimensions of the fitting forming portion 111 are different. It is the same as each other except that the shape and size of the combined portion 121 are different.

As the metal constituting the metal member 11, any metal having a melting point higher than that of the thermoplastic 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 wrought materials such as 5000 series, 6000 series and aluminum alloys for casting;
steel;
Magnesium and its alloys;
Titanium and its alloys.

  The metal member 11 can be manufactured in a desired shape by, for example, a die casting method.

  The thickness T of the metal member 11 is not particularly limited, and is usually 1 to 10 mm, preferably 2 to 5 mm. The thickness T of the metal member 11 is the thickness of the overlapping portion with the resin member 12 and the thickness of the substantially flat plate-shaped portion that does not have the fitting formation portion 111.

  The resin member 12 contains a thermoplastic polymer, and may further contain reinforcing fibers.

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 and acid-modified products thereof;
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);
Styrenic resins such as acrylonitrile-butadiene-styrene copolymer resin (ABS) and polystyrene (PS);
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).

  As the thermoplastic polymer constituting the resin member 12, a polyolefin resin, particularly polypropylene, which is inexpensive and excellent in mechanical properties is preferably used.

  The molecular weight of the thermoplastic polymer is not particularly limited. For example, the molecular weight may be such that the MFR (melt flow rate value) at 230 ° C. is 2 to 200 g / 10 minutes, particularly 2 to 55 g / 10 minutes. .

  In this specification, the value measured by JIS K 7210 is used for the MFR of the polymer.

  The reinforcing fibers contained in the resin member 12 are fibers that are uniformly contained and dispersed in the polymer in order to improve strength in the field of polymer-containing composite materials. Reinforcing fibers are generally roughly classified into continuous fibers and discontinuous fibers. In the present invention, reinforcing fibers may be continuous fibers, discontinuous fibers, or a mixture thereof. It may be a fiber. In the present invention, the reinforcing fiber is particularly preferably a discontinuous fiber. The type of reinforcing fiber is not particularly limited, and examples thereof include carbon fiber and glass fiber.

  The content of the reinforcing fiber is not particularly limited, and is usually 50% by weight or less, particularly 10 to 50% by weight, and preferably 20 to 50% by weight with respect to the total amount of the resin member 12.

  The resin member 12 can be manufactured in a desired shape by, for example, an injection molding method.

  The thickness t of the resin member 12 is not particularly limited, and is usually 1 to 10 mm, preferably 2 to 5 mm. The thickness t of the resin member 12 is the thickness of the overlapping portion with the metal member 11 and is the thickness of the substantially flat plate-shaped portion that does not have the fitting formation portion 121.

  The resin member 12 may further contain additives such as a stabilizer, a flame retardant, and a coloring material.

  The embodiment I and the embodiment II have been described above. From the description of such embodiment I and embodiment II, other embodiments (for example, one of the fitting formation portion of the metal member and the fitting formation portion of the resin member has a composite shape of a convex shape and a concave shape). It is clear that the effect of the present invention can be obtained even in an embodiment in which the other has a shape that complementarily corresponds to the shape of the one fitting formation portion.

[4] One embodiment of the joining method according to the present invention (friction stir welding method)
The method of joining the metal member and the resin member by the friction stir welding method according to the present invention is at least the following steps:
A first step in which the metal member 11 and the resin member 12 are fitted together by their fitting forming portions and superimposed; and while the rotary tool 16 is rotated as the pressing member, the metal member 11 is pressed to generate frictional heat. The second step of softening and melting the resin member 12 by this frictional heat and then solidifying it to join the metal member 11 and the resin member 12:
Is included.

First step:
In the first step, for example, as shown in FIGS. 1, 3A, 4A, 5A, 6A, 7A, and 8A, the metal member 11 and the resin member 12 are formed by the fitting formation portions 111 and 121. The member 11 and the resin member 12 are overlapped in a fitted state. Specifically, the metal member 11 and the resin member 12 are overlapped so that the fitting formation portion 111 of the metal member 11 and the fitting formation portion 121 of the resin member 12 are fitted.

  At this time, the metal member 11 and the resin member 12 in the fitted state are preferably a rotary tool so that at least a part of the fitting formation portion 121 of the resin member 12 is located in the melt-solidified region of the resin member 12. 16 and the receiving member 17 for joining in the second step. When at least a part of the fitting forming portion 121 of the resin member 12 is located in the melt-solidified region of the resin member 12, as shown in FIG. 9, when the metal member 11 is peeled from the finally obtained joined body, This means that at least a part of the fitting forming portion 121 of the resin member 12 is located in the melt-solidified region 125 of the resin member 12. The melted and solidified region 125 of the resin member 12 is a region formed by melting and solidifying the resin member 12 at the time of joining on the contact surface 120 with the metal member 11. This is a region where there are steps (steps of several microns) that can be visually discriminated on the outer periphery 126 of the. Specifically, after the metal member 11 is peeled off, when the contact surface 120 of the resin member 12 with the metal member 11 is observed from the front, at least one of the engagement forming portion 121 regions is formed in the outer periphery 126 of the melt-solidified region 125. It is sufficient that the part is included. FIG. 9: is a schematic model of the resin member when the metal member is forcibly separated from the joined body obtained by the joining method according to Embodiment I-1 and the contact surface of the resin member with the metal member is observed from the front. FIG.

  From the viewpoint of further improving the joint strength in the shear direction and improving the joint strength in the thickness direction, as shown in FIG. 10, the fitting formation portion of the resin member 12 on the contact surface 120 of the resin member 12 with the metal member 11. It is only necessary that a part of 121 is located in the melt-solidified region 126 of the resin member 12. From the same viewpoint, preferably, as shown in FIG. 9, the entire fitting formation portion 121 of the resin member 12 is located in the melt-solidified region 126 of the resin member 12. For example, when the convex fitting formation part which the metal member 11 or the resin member 12 has has a cylindrical shape, the whole fitting formation part 121 of the resin member 12 is located in the melt-solidified region 126 of the resin member 12. In this case, the metal member 11 and the resin member 12 in a fitted state may be supplied between the rotary tool 16 and the receiving member 17 so that the columnar shaft is arranged on the axis of the rotary tool 16. .

  In the present invention, at least a part of the fitting forming portion 121 of the resin member 12 does not necessarily have to be located in the melt-solidified region 126 of the resin member 12. For example, as shown in FIG. In the contact surface 120 of the member 12 with the metal member 11, the fitting formation portion 121 of the resin member 12 may be located outside the melt-solidified region 126 of the resin member 12. This is because the effect of improving the joint strength in the shear direction can be sufficiently obtained. The contact surface 120 of the resin member 12 with the metal member 11 is a surface that has been in contact with the metal member 11 until the metal member 11 is peeled off.

Second step:
In the second step, at least a pushing and stirring step C <b> 2 is performed in which the rotary tool 16 is pushed into the metal member 11 to enter a depth that does not reach the boundary surface 13 between the metal member 11 and the resin member 12.

In the second step, it is preferable to perform the preheating step C1 in which the rotating tool 16 is rotated in a state where only the front end portion of the rotating tool 16 is in contact with the surface portion of the metal member 11 before the pushing and stirring step. It doesn't have to be done.
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 a position where the rotary tool 16 has entered to a depth that does not reach the boundary surface 13, but the step is not necessarily performed. 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 to thereby be referred to as FIGS. 3A, 4A, 5A, 6A, 7A, and 8A (hereinafter referred to as “FIG. 3A etc.”). ), The rotating tool 16 is rotated in a state where only the tip of the rotating tool 16 is in contact with the surface portion (upper surface portion in the illustrated example) of the metal 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). 3A and the like are schematic cross-sectional views when the ZZ cross section in FIG. 1 is viewed in the arrow direction.

  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.

  In the preheating step C <b> 1, the frictional heat is also transmitted to the resin member 12 through the boundary surface 13 between the metal member 11 and the resin member 12. The frictional heat is transferred to the inside of the resin member 12, and the range of the Q region immediately below the pressing region P and the range near the Q region on the boundary surface 13 of the resin member 12 are preheated. Thereby, the resin member 12 becomes easy to soften and melt in the next indentation stirring step C2.

  The first pressurizing force and the first pressurizing time in the preheating step C1 are set, for example, from the viewpoint of ease of pushing in the rotating tool 16 as described above and from the viewpoint of softening and melting of the resin member 12, The value 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 or more and 2 A value of less than 0 seconds and a rotation speed of the rotary tool are preferably 500 rpm or more and 10,000 rpm or less.

(Indentation stirring step C2)
In the indentation stirring step C2, the rotary tool 16 and the receiving member 17 are brought close to each other, thereby making it possible to refer to FIGS. 3B, 4B, 5B, 6B, 7B and 8B (hereinafter referred to as “FIG. 3B etc.”). This is a step of pushing the rotary tool 16 into the metal member 11 as shown in FIG. 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. 3B and the like. Thereby, the rotary tool 16 is advanced to a depth that does not reach the boundary surface 13 between the metal member 11 and the resin member 12.

The pushing amount k of the rotary tool 16 is expressed by the following relational expression about the thickness T of the metal member 11 from the viewpoint of improving the bonding strength in the peeling direction by suppressing the decomposition of the molten resin on the surface of the resin member in the region immediately below the rotary tool 16 ( It is preferable to satisfy v-1). The indentation amount k preferably satisfies the following relational expression (v-2) and further satisfies the following relational expression (v-3) from the viewpoint of further improving the bonding strength in the peeling direction (welding area). More preferred:
0.1 × T ≦ k ≦ 0.6 × T (v−1);
0.2 × T ≦ k ≦ 0.5 × T (v-2);
0.3 * T <= k <= 0.4 * T (v-3). )
In Embodiment I, k is generally less than T and 0.5 mm or more while satisfying the above relational expression.
In Embodiment II, k is generally less than Th ′ and 0.5 mm or more while satisfying the above relational expression.

  In Embodiment I-2 shown in FIG. 4B and Embodiment II-2 shown in FIG. 7B, the portion immediately below the rotary tool of the metal member 11 may be protruded and deformed toward the resin member 12 in this step. Thereby, the molten resin on the surface of the resin member melted in the region Q (see FIGS. 4A and 7A) immediately below the rotary tool on the boundary surface 13 may flow to the outer peripheral region of the region Q.

  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. The penetration depth is preferably in the range of the pushing amount k. In the embodiment I-2 shown in FIG. 4B and the embodiment II-2 shown in FIG. 7B, the boundary surface between the metal member 11 and the resin member 12 immediately below the rotary tool of the metal member 11 due to the pressing of the rotary tool 16. 13 may move to the receiving member 17 side (lower side in the illustrated example), and the immediate lower part may project and deform toward the resin member 12 side. Thereby, the molten resin on the surface of the resin member melted in the region Q (see FIGS. 4A and 7A) of the rotary tool on the boundary surface 13 may flow over the region Q and to the outer peripheral region. . At this time, the molten resin spreads in a substantially circular shape centering on the region Q immediately below the rotary tool. As a result, the contact area between the molten resin and the metal member 11 is expanded, and the melted and solidified region (bonding region) formed by solidifying the molten resin by cooling in the obtained bonded body is also expanded. Bonding with the member can be achieved with sufficient strength.

  If the rotary tool 16 is pushed excessively (that is, if the applied pressure is too high and / or the pressurizing time is too long), the shoulder portion 16b of the rotary tool 16 exceeds the 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 pushing and stirring step C2, the pushing of the rotating tool 16 is stopped when the shoulder portion 16b of the rotating tool 16 enters a depth that does not reach the boundary surface. In other words, the rotary tool 16 is advanced to a depth that does not reach the boundary surface. As a result, in the next agitation maintaining step C3, frictional heat is generated at a reference position close to the resin member 12, and a large amount of frictional heat is transmitted to the resin member 12, so that the region Q immediately below the rotary tool on the boundary surface 13 of the resin member 12 is obtained. And the softening and melting of the outer peripheral region are promoted. In some cases, the molten resin in the region Q immediately below may flow to the outer peripheral region.

  The second pressurizing force and the second pressurizing time in the indentation stirring step C2 are set, for example, from the viewpoint of avoiding the opening of the metal member 11 and the rotating tool 16 as close to the resin member 12 as possible. The value 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 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 second or more. The value of less than 0.5 seconds and the rotation speed of the rotary tool are preferably 500 rpm or more and 10,000 rpm or less.

(Stirring maintenance step C3)
In the agitation maintaining step C3, the rotation tool 16 and the receiving member 17 are stopped from approaching each other, and as shown in FIG. This is a step of continuing the rotation operation of the rotary tool 16 at the “position”). In the agitation maintaining step C3, the rotary tool 16 is moved to a third pressurization time (for example, 6.75) longer than the first pressurization time with a third pressurization force (for example, 500 N) smaller than the first pressurization 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 may be sufficiently softened and melted in a wide range beyond the range of the region Q immediately below the pressing region P. In FIG. 3B and the like, “x” marks indicate melting of the resin.

  The third pressurizing force and the third pressurizing time of the stirring maintaining step C3 are set, for example, from the viewpoint of sufficient softening and melting of the resin member 12 as described above, and the values thereof are, for example, rotation It varies depending on the number of rotations of the 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 third pressing force in the stirring and maintaining step C3 is preferably a value of 100 N or more and less than 700 N, particularly a value of 100 N or more and 600 N or less. The third pressurizing time is preferably 1.0 to less than 10 seconds, and the rotation speed of the rotary tool is preferably 500 to 10000 rpm.

(Holding process C4)
Finally, a holding step C4 may be performed in which the rotation of the rotary tool 16 is stopped and the rotary tool 16 is held for a predetermined pressurizing time with a predetermined pressure in that state.
Similarly, as shown in FIG. 3B and the like, the holding step C4 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 has been stopped presses the metal member 11 and the resin member 12 in the pressing region P because the applied pressure is smaller than the indentation agitation step C2 but greater than the agitation maintenance step C3. And clamp with the receiving member 17. 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, for example, from the viewpoint of improving the adhesion strength at least in the region Q during the cooling period as described above, and the values thereof are, for example, the metal member 11 It depends on the type of material. For example, when the aluminum alloy metal member 11 is used, the fourth pressure in the holding step C4 is preferably a value of 700 N or more and less than 1200 N, and the fourth pressurization time is preferably a value of 1 second or more, for example.

  In the present invention, at least through the above-described step C2, preferably through the above-described steps C1 and C2, more preferably through the above-described steps C1 to C3, and then further through step C4 as necessary, finally. As a result, a bonded body with sufficiently improved bonding strength in the shear direction can be 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 and air cooling.

  As described above, the case where the metal member and the resin member are joined in a point shape without moving the rotary tool in the surface direction on the contact surface of the metal member (point joining) has been described. It is clear that the effect of the present invention can be obtained even when the metal member and the resin member are joined linearly while being moved (line joining).

<Experimental example I>
Experimental Example I is an experimental example related to Embodiment I. Specifically, Example A1 relates to embodiment I-1 (FIGS. 3A and 3B), Example B1 relates to embodiment I-2 (FIGS. 4A and 4B), and Example C1 includes embodiment I-3 (FIG. 5A). And FIG. 5B).

[Example A1]
(Metal member)
A metal member 11 shown in FIG. 3A was manufactured by die casting using JIS ADC12. The metal member 11 is a flat plate having an overall shape of width 30 mm × length 100 mm × thickness T (see Table 1) and provided with a convex portion (fitting formation portion) 111 having a columnar shape having the dimensions shown in Table 1. Met.

(Resin member)
A resin member 12 shown in FIG. 3A was manufactured by injection molding using carbon fiber reinforced plastic (CFRP). The resin member 12 includes a flat plate having an overall shape of width 30 mm × length 100 mm × thickness t (see Table 1) and a concave portion (fitting formation portion) 121 having a cylindrical shape having the dimensions shown in Table 1. there were. CFRP was a polypropylene containing 40% by weight of discontinuous carbon fibers.

(Rotation tool)
As the rotating tool, a tool made of tool steel having dimensions of each part in FIG. 2 of D1 = 10 mm, D2 = 2 mm, and h = 0.5 mm 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. 3A, the fitting forming portion 111 of the metal member 11 and the fitting forming portion 121 of the resin member 12 are fitted, and the axis of the fitting forming portion (columnar shape) 111 of the metal member is a rotary tool. The end of the metal member 11 and the end of the resin member 12 were overlapped so as to be arranged on the 16 axes (FIG. 1).

Second step:
First, as shown in FIG. 3A, the rotary tool 16 was rotated in a state where only the tip portion of the rotary tool 16 was in contact with the surface portion of the metal member 11 (preheating step C1: pressure 900N, pressurization time 1.. 00 seconds, tool rotation speed 3000 rpm).

Thereafter, as shown in FIG. 3B, the rotary tool 16 is pushed into the metal member 11 to enter a depth (pushing amount k) that does not reach the boundary surface 13 between the metal member 11 and the resin member 12 (push stirring step C2). : Pressurizing force 1500 N, pressurizing time 0.25 seconds, tool rotation speed 3000 rpm).
Next, as shown in FIG. 3B, 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 boundary surface 13 (stirring maintaining step C3: pressurizing pressure 500N, pressurizing time) 6.75 seconds, tool rotation speed 3000 rpm).
Subsequently, the rotary tool 16 was extracted from the metal member 11 and allowed to cool down to obtain a joined body.

[Comparative Example A1]
The fitting formation portions 111 and 121 were not formed on the metal member 11 and the resin member 12, respectively, and the end portion of the metal member 11 and the end portion of the resin member 12 were directly overlapped in step 1 in the joining method. Except for this, a joined body was obtained in the same manner as in Example A1.

[Example B1]
The material constituting the metal member 11 and the resin member 12 and the dimensions of the fitting formation portion 111 of the metal member 11 and the fitting formation portion 121 of the resin member 12 have been changed as shown in Table 2, as shown in FIG. 4A. Except that the end portion of the metal member 11 and the end portion of the resin member 12 were overlapped and the preheating step C1 was performed, and as shown in FIG. 4B, the indentation stirring step C2 and the stirring maintaining step C3 were performed. A joined body was obtained in the same manner as in Example A1.

[Comparative Example B1]
The fitting formation portions 111 and 121 were not formed on the metal member 11 and the resin member 12, respectively, and the end portion of the metal member 11 and the end portion of the resin member 12 were directly overlapped in step 1 in the joining method. Except for this, a joined body was obtained in the same manner as in Example B1.

[Example C1]
The material constituting the metal member 11 and the resin member 12 and the dimensions of the fitting formation portion 111 of the metal member 11 and the fitting formation portion 121 of the resin member 12 have been changed as shown in Table 3, as shown in FIG. 5A. Except that the end portion of the metal member 11 and the end portion of the resin member 12 were overlapped and the preheating step C1 was performed, and as shown in FIG. 5B, the indentation stirring step C2 and the stirring maintaining step C3 were performed. A joined body was obtained in the same manner as in Example A1.

[Comparative Example C1]
The fitting formation portions 111 and 121 were not formed on the metal member 11 and the resin member 12, respectively, and the end portion of the metal member 11 and the end portion of the resin member 12 were directly overlapped in step 1 in the joining method. Except for this, a joined body was obtained in the same manner as in Example C1.

<Experimental example II>
Experimental Example II is an experimental example related to Embodiment II. Specifically, Example D1 relates to embodiment II-1 (FIGS. 6A and 6B) and Example E1 relates to embodiment II-2 (FIGS. 7A and 7B).

[Example D1]
The metal member 11 and the resin member 12 have been changed to those shown below, and as shown in FIG. 6A, the end of the metal member 11 and the end of the resin member 12 are overlapped and the preheating step C1 is performed. And as shown to FIG. 6B, the joined_body | zygote was obtained by the method similar to Example A1 except having performed the indentation stirring process C2 and the stirring maintenance process C3.

(Metal member)
A metal member 11 shown in FIG. 6A was manufactured by die casting using JIS ADC12. The metal member 11 includes a flat plate having an overall shape of width 30 mm × length 100 mm × thickness T (see Table 4) and a concave portion (fitting formation portion) 111 having a columnar shape having the dimensions shown in Table 4. there were.

(Resin member)
A resin member 12 shown in FIG. 6A was manufactured by injection molding using carbon fiber reinforced plastic (CFRP). The resin member 12 is a flat plate having an overall shape of width 30 mm × length 100 mm × thickness t (see Table 4) provided with a convex portion (fitting forming portion) 121 having a columnar shape having the dimensions shown in Table 4. Met. CFRP was a polypropylene containing 40% by weight of discontinuous carbon fibers.

[Comparative Example D1]
The fitting formation portions 111 and 121 were not formed on the metal member 11 and the resin member 12, respectively, and the end portion of the metal member 11 and the end portion of the resin member 12 were directly overlapped in step 1 in the joining method. Except for this, a joined body was obtained in the same manner as in Example D1.

[Example E1]
The material constituting the metal member 11 and the resin member 12 and the dimensions of the fitting formation portion 111 of the metal member 11 and the fitting formation portion 121 of the resin member 12 have been changed as shown in Table 5, as shown in FIG. 7A. Except that the end of the metal member 11 and the end of the resin member 12 were overlapped and the preheating step C1 was performed, and the indentation stirring step C2 and the stirring maintaining step C3 were performed as shown in FIG. 7B, A joined body was obtained in the same manner as in Example A1.

[Comparative Example E1]
The fitting formation portions 111 and 121 were not formed on the metal member 11 and the resin member 12, respectively, and the end portion of the metal member 11 and the end portion of the resin member 12 were directly overlapped in step 1 in the joining method. Except that, a joined body was obtained in the same manner as in Example E1.

<Joint strength in the shear direction (shear strength)>
As shown in FIG. 12, the shear strength of the joint was measured by pulling the joined body 20 of the metal member 11 and the resin member 12 in the longitudinal direction.
In Examples A1, B1, C1, and E1, the measurement was completed when the base material (main body) itself of the resin member was broken.
In Example D1, the measurement was completed when the convex portion of the resin member itself was broken.
In Comparative Examples A1, B1, C1, D1, and E1, the measurement was completed when the resin at the joint interface between the metal member 11 and the resin member 12 was coherently broken.

<Relationship between resin member fitting forming portion and resin member melting and solidifying region>
In Examples A1, B1, C1, D1, and E1, when the resin member 12 is peeled from the metal member 11, the fitting formation portion 121 of the resin member 12 is in the melt-solidified region 125 of the resin member 12 as shown in FIG. Was located at.

  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 apparatus 10: Work 11: Metal member 12: Resin member 13: Interface between metal member and resin member 16: Rotating tool 17: Receiving tool 110: Contact surface of metal member with resin member 111: Metal Member fitting formation portion 120: Contact surface of resin member with metal member 122: Resin member fitting formation portion

Claims (16)

Thermo-pressure bonding in which a metal member and a resin member are superposed, pressure is applied to the resin member by pressing from the metal member side by the pressing member, and the resin member is softened and melted by heat, and then solidified and bonded. A method of joining a metal member and a resin member by a method,
On each of the mutual contact surfaces of the metal member and the resin member, a fitting formation portion for fitting the metal member and the resin member is provided,
Said metal member and have lines joining in a state where said the resin member is fitted by the fitting formation portion,
The fitting formation part of the metal member has a cylindrical convex shape,
The resin member fitting formation portion has a concave shape corresponding to the shape of the metal member fitting formation portion,
The height h and the diameter d in the cylindrical convex shape of the fitting formation portion of the metal member satisfy the following relational expression for the thickness T of the metal member and the width D1 of the pressing member: Joining method :
0.1 × T ≦ h ≦ 2 × T;
0.4 × D1 ≦ d ≦ 3 × D1 . Thermo-pressure bonding in which a metal member and a resin member are superposed, pressure is applied to the resin member by pressing from the metal member side by the pressing member, and the resin member is softened and melted by heat, and then solidified and bonded. A method of joining a metal member and a resin member by a method,
On each of the mutual contact surfaces of the metal member and the resin member, a fitting formation portion for fitting the metal member and the resin member is provided,
Said metal member and have lines joining in a state where said the resin member is fitted by the fitting formation portion,
The fitting formation part of the resin member has a cylindrical convex shape,
The fitting formation part of the metal member has a concave shape corresponding to the shape of the fitting formation part of the resin member,
A metal member and a resin member in which the height h ′ and the diameter d ′ in the columnar convex shape of the fitting formation portion of the resin member satisfy the following relational expression for the thickness T of the metal member and the width D1 of the pressing member: Joining method :
0.1 × T ≦ h ′ ≦ T−0.5;
0.4 × D1 ≦ d ′ ≦ 3 × D1 .   The hot-pressure bonding method is a friction stir welding method,
  The method for joining a metal member and a resin member according to claim 1 or 2, wherein the friction stir welding method includes the following steps:
  A first step of superimposing the metal member and the resin member while fitting the metal member and the resin member by their fitting forming portions; and
  While rotating the rotary tool as the pressing member, the metal member is pressed to generate frictional heat, the resin member is softened and melted by the frictional heat, and then solidified to join the metal member and the resin member. 2 steps.   4. The metal member according to claim 3, 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. And joining method of resin member.   The said 2nd step is further equipped with the pre-heating process which rotates the said rotation tool in the state which made only the front-end | tip part of a rotation tool contacted the surface part of the metal member before the said pushing stirring process. The joining method of the metal member and resin member of description.   In the preheating step, the rotary tool is rotated by a first pressurizing time while being pressed with a first pressing force,
  The said agitation stirring process rotates only the 2nd pressurization time shorter than the said 1st pressurization time, pressing the said rotation tool with the 2nd pressurization force larger than the said 1st pressurization force. Joining method of metal member and resin member.   The second step further comprises an agitation maintaining step of continuing the rotating operation of the rotating tool at a position where the rotating tool has entered to a depth not reaching the boundary surface,
  The said stirring maintenance process WHEREIN: The said rotating tool is rotated only for the 3rd pressurization time longer than the said 1st pressurization time, pressing with the 3rd pressurization force smaller than the said 1st pressurization force. Joining method of metal member and resin member.   The second step further comprises a holding step of stopping the rotation of the rotary tool after the stirring maintaining step and holding the rotary tool for a predetermined pressurizing time with a predetermined pressure in that state. The joining method of the metal member and resin member of Claim 7. Thermo-pressure bonding in which a metal member and a resin member are superposed, pressure is applied to the resin member by pressing from the metal member side by the pressing member, and the resin member is softened and melted by heat, and then solidified and bonded. A method of joining a metal member and a resin member by a method,
On each of the mutual contact surfaces of the metal member and the resin member, a fitting formation portion for fitting the metal member and the resin member is provided,
Said metal member and have lines joining in a state where said the resin member is fitted by the fitting formation portion,
The hot-pressure bonding method is a friction stir welding method,
The method of joining a metal member and a resin member , wherein the friction stir welding method includes the following steps :
A first step of superimposing the metal member and the resin member while fitting the metal member and the resin member by their fitting forming portions; and
While rotating the rotary tool as the pressing member, the metal member is pressed to generate frictional heat, the resin member is softened and melted by the frictional heat, and then solidified to join the metal member and the resin member. 2 steps .   10. The metal member according to claim 9, wherein the second step includes a pressing and stirring step of pressing the rotating tool into the metal member to enter a depth not reaching a boundary surface between the metal member and the resin member. And joining method of resin member.   The second step further includes a preheating step of rotating the rotary tool in a state where only the tip portion of the rotary tool is in contact with the surface portion of the metal member before the indentation stirring step. The joining method of the metal member and resin member of description.   In the preheating step, the rotary tool is rotated by a first pressurizing time while being pressed with a first pressing force,
  The said agitation process WHEREIN: The said rotating tool is rotated only for the 2nd pressurization time shorter than the said 1st pressurization time, pressing with the 2nd pressurization force larger than the said 1st pressurization force. Joining method of metal member and resin member.   The second step further comprises an agitation maintaining step of continuing the rotating operation of the rotating tool at a position where the rotating tool has entered to a depth not reaching the boundary surface,
  The said stirring maintenance process rotates only the 3rd pressurization time longer than the said 1st pressurization time, pressing the said rotary tool with the 3rd pressurization force smaller than the said 1st pressurization force. Joining method of metal member and resin member.   The second step further comprises a holding step of stopping the rotation of the rotary tool after the stirring maintaining step and holding the rotary tool for a predetermined pressurizing time with a predetermined pressure in that state. The method for joining the metal member and the resin member according to claim 13.   2. The metal member and the resin member in a fitted state are subjected to the joining so that at least a part of a fitting formation portion of the resin member is located in a melt-solidified region of the resin member. The joining method of the metal member in any one of -14, and a resin member.   One of the fitting formation part of the metal member and the fitting formation part of the resin member has a convex shape, a concave shape or a composite shape thereof,
  The other of the fitting formation part of the said metal member and the fitting formation part of the said resin member has a complementary shape corresponding to the shape of said one fitting formation part. A method of joining a metal member and a resin member.

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