Method for joining metal member and resin member and joining structure

Abstract

According to the present invention, when joining a metal member and a resin member by butting side surfaces of the metal member and resin member together, side surfaces of a metal member (1) and a resin member (2) having an equal plate thickness are butted together at a butt interface 3; a metal thin plate (4) is placed over one of flat surfaces formed by the butted metal member (1) and resin member (2); and a rotating rotary tool (7) is pushed in from the front surface side of the metal thin plate (4) with a probe portion (8) of the rotary tool (7) disposed on the metal member (1) side at an offset from the butt interface (3), and the rotating rotary tool (7) is moved along the butt interface (3) to join the metal member (1), the resin member (2), and the metal thin plate (4) to each other.

Description

Technical Field

[0001] The present invention relates to a method and a structure for joining a metal member and a resin member.

Background Art

[0002] Conventionally, for weight reduction and the like, in products in various fields such as home appliances and automobiles, it has been common to use a combination of a metal material and a resin material, and the demand for joining a metal member and a resin member has also been increasing.

[0003] When joining a metal member and a resin member in this way, conventionally, in addition to a method using an adhesive and a mechanical coupling method such as bolting, friction stir welding (FSW) that can locally apply heat is also used as a new technique (see, for example, Patent Document 1).

[0004] In this friction stir welding for overlapping and joining a metal material and a resin material, at least a part of the metal member and the resin member are overlapped with each other, and a tool is press-fitted from the resin member side toward the metal member.

[0005] In addition, in Patent Document 2, one end of thin metal plates is overlapped with each other on a backing plate by a predetermined length, and a butt joint of the thin metal plates is formed by frictional heat and pressing force by a rotating tool.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] In mechanical joining methods such as those using conventional adhesives, there were problems with the reliability of the joint part and the like.

[0008] Also, in the case of the one in Patent Document 1, it was possible to join by overlapping a metal material and a resin material, but in the case of butting joint, there were problems such as the joint area being small and the required joint strength not being obtained, or the resin surface contacted by the tool being damaged by frictional heat or pressing force.

[0009] Furthermore, in the case of the one in Patent Document 2, it was possible to form a butted joint by friction joining by overlapping a part of metal materials, but the application of the same joining method to metal materials and resin materials was difficult due to the same problems as above.

[0010] The present invention has been made in view of such points, and the object thereof is to obtain the necessary joint strength while preventing the resin surface from being damaged by frictional heat or pressing force.

Means for Solving the Problems

[0011] In order to achieve the above object, in this invention, from above the metal thin plate overlapped on the butting interface of the metal member and the resin member, the probe part of the rotary tool is shifted from the butting interface to the metal member side and press-fitted so as to move along the butting interface.

[0012] Specifically, in the first invention, a butting step of butting the side surfaces of a metal member and a resin member having the same plate thickness at the butting interface, a superimposing step of superimposing a metal thin plate on one flat surface formed by the butted metal member and resin member, a joining step in which the metal member, the resin member, and the metal thin plate are joined to each other by press-fitting a rotating rotary tool while shifting the probe part of the rotary tool from the surface side of the metal thin plate to the metal member side more than the butting interface and moving along the butting interface, and the configuration includes these steps.

[0013] According to the above configuration, a metal thin plate is superimposed on the butting interface formed between a metal member and a resin member having the same thickness with their sides butted against each other. With the metal thin plate shifted toward the metal member side, a rotary tool is press-fitted from the metal thin plate side and moves along the butting interface to perform friction stir welding. As a result, at the bonding interfaces between the metal member and the metal thin plate, the metal member and the resin member, and the resin member and the metal thin plate, they are bonded by the stirring effect, frictional heat, and the pressure of the tool. Thereby, the bonding is performed without damaging the resin surface. Note that "the same plate thickness" means that there may be a slight difference in plate thickness, such as a manufacturing error.

[0014] In the second invention, in the first invention, With the tip outer periphery of the probe portion being shifted from the butting interface of the rotary tool so as not to exceed the vicinity of the butting interface between the metal member and the resin member, the rotary tool is press-fitted and moved along the butting interface.

[0015] According to the above configuration, by approaching the butting interface as close as possible without exceeding the butting interface, it is possible to prevent the resin surface from being damaged while obtaining the necessary bonding strength.

[0016] In the third invention, in the first or second invention, With the tip outer periphery of the probe portion being shifted from the butting interface of the rotary tool so as to coincide with the butting interface between the metal member and the resin member, the rotary tool is press-fitted and moved along the butting interface.

[0017] According to the above configuration, even if the probe diameter changes, it is easy to position, and while preventing the resin surface from being damaged, the necessary bonding strength can be obtained. In addition, since a large amount of heat can be applied to the resin while suppressing excessive contact between the side surface of the probe portion and the resin, the workability is improved by increasing the bonding speed.

[0018] In the fourth invention, in any one of the first to third inventions, In the above joining process, while pressing and supporting the flat surface of the backing metal from the back side of the butting interface, the rotary tool is press-fitted and moved along the butting interface, In the metal member and the resin member after the above joining process, at least the opposite side of the metal thin plate is configured to be flat.

[0019] According to the above configuration, at least one side surface is flat and has a nice finish.

[0020] In the fifth invention, in any one of the first to fourth inventions, A configuration is adopted in which the metal thin plate thinner than the plate thicknesses of the metal member and the resin member is used.

[0021] According to the above configuration, while preventing the resin member from being broken, the metal member and the resin member can be appropriately friction stir-welded.

[0022] In the sixth invention, in any one of the first to fifth inventions, The resin member is a thermoplastic resin. In the joining process, at least a part of the resin member is melted, and the plastically deformed metal thin plate is joined to the metal member. After flowing into the resin member side, it is cured and joined.

[0023] According to the above configuration, since the resin member is not directly stirred but is joined to the metal thin plate that has melted by heat, plastically deformed, and flowed in, the resin member is not broken.

[0024] In the seventh invention, in any one of the first to sixth inventions, In the above joining process, with the tip surface of the probe portion penetrating into the range from 0.15 mm or less on the metal thin plate side to 0.30 mm or less on the metal member side with respect to the interface between the metal thin plate and the metal member, the metal member, the resin member, and the metal thin plate are joined to each other.

[0025] When the tip surface of the probe part penetrates shallowly more than 0.15 mm on the metal thin plate side from the interface between the metal thin plate and the metal member, sufficient joining strength cannot be obtained due to insufficient stirring of the metal thin plate. When it penetrates deeper than 0.30 mm on the metal member side from the interface between the metal thin plate and the metal member, there is a risk that defects are likely to occur due to the simultaneous stirring of the metal member and the metal thin plate. Therefore, when the tip surface of the probe part penetrates to an appropriate position, the metal member and the resin member can be friction stir joined appropriately.

[0026] In the eighth invention, in any one of the first to seventh inventions, The length of the probe part is configured to be the same as the thickness of the metal thin plate.

[0027] According to the above configuration, it is easy to control the penetration depth of the probe part and the penetration depth of the shoulder part.

[0028] In the ninth invention, in any one of the first to eighth inventions, In the joining step, the rotation speed of the probe part is 1500 rpm or more and 2000 rpm or less, and the joining speed is 100 mm / min or more and 300 mm / min or less.

[0029] If the rotation speed of the probe part is slower than 1500 rpm, the heat input is too small and it becomes difficult to press-fit the probe part. If it is faster than 2000 rpm, the heat input is too large and there is a risk that the surface of the resin member is destroyed by heat. Even if the joining speed is slower than 100 mm / min, the heat input may be too large and there is a risk that the surface of the resin member is destroyed by heat. If it is faster than 300 mm / min, the heat input amount becomes small. As a result, it has an adverse effect on the joining structure. However, according to the above configuration, while preventing the destruction of the resin member, the metal member and the resin member can be friction stir joined appropriately.

[0030] In the tenth invention, the side surfaces of a metal member and a resin member having the same plate thickness are butted against each other at an interface, and while a thin metal plate is overlapped on one flat surface formed by the metal member and the resin member, a rotating rotary tool is press-fitted from the surface side of the thin metal plate and moved along the butting interface, targeting a joining structure of a metal member and a resin member in which the metal member, the resin member, and the thin metal plate are joined to each other. The joining structure is as follows. The thin metal plate plastically deformed by the rotary tool flows into and is joined to the resin member side where at least a part is melted. The amount of the thin metal plate flowing into the resin member side is larger than the amount of the metal member plastically deformed by the rotary tool flowing into the resin member side.

[0031] According to the above configuration, since the plastically deformed thin metal plate is joined so as to flow into the melted resin member side, after the resin member is cured, it is surely joined, and since the resin surface is not broken, a high joining strength is obtained, and a joining structure with a good appearance can be obtained.

[0032] In the eleventh invention, in the tenth invention, At least the opposite side of the thin metal plate of the joining portion between the metal member and the resin member is flat.

[0033] According to the above configuration, a joining structure with a good appearance and a high joining strength can be obtained where one side of the joining portion is flat.

Effect of the Invention

[0034] As described above, according to the present invention, even when the side surfaces of a metal member and a resin member are butted and joined, the necessary joining strength can be obtained while preventing the resin surface from being broken by frictional heat or pressing force.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0037] FIG. 1 and FIG. 2 show a method of joining a metal member 1 and a resin member 2 according to an embodiment of the present invention. In this joining method, from above a metal thin plate 4 stacked on the butting interface 3 of the metal member 1 and the resin member 2, the probe portion 8 of the rotary tool 7 is shifted from the butting interface 3 to the metal member 1 side and press-fitted and moved along the butting interface 3.

[0038] The specific joining method will be described with reference to the drawings.

[0039] First, metal members 1 and resin members 2 having the same plate thickness are prepared. Also, a metal thin plate 4 thinner than the plate thicknesses of the metal member 1 and the resin member 2 is prepared. Here, "having the same plate thickness" means that there may be a slight difference in plate thickness, such as manufacturing error.

[0040] For example, the metal member 1 is made of a light metal plate member such as a magnesium alloy or an aluminum alloy that can be friction stir welded. The resin member 2 is made of a thermoplastic resin material having the same plate thickness as the metal member 1. The thin metal plate 4 is made of a thin plate member of a light metal such as a magnesium alloy or an aluminum alloy that can be friction stir welded, and has a thickness that is at least thinner than that of the metal member 1 and the resin member 2. The metal member 1 and the thin metal plate 4 may be made of the same material or different materials. Furthermore, the materials of the metal member 1 and the thin metal plate are not particularly limited as long as they are metals that can be friction stir welded even if they are not light metals. The resin member 2 can be applied even if it is a thermosetting resin because it undergoes some plastic deformation, but a thermoplastic resin is preferred because the melting process can be utilized.

[0041] Next, in the butting step, the side surfaces of the metal member 1 and the resin member 2 are butted against each other at the butting interface 3 and placed on a flat base (for example, the backing plate 11).

[0042] Next, in the overlapping step, the thin metal plate 4 is overlapped on one flat surface (hereinafter referred to as the upper surface 5) formed by the butted metal member 1 and the resin member 2. Since the metal member 1 and the resin member 2 basically have the same plate thickness, it is easy to place the thin metal plate 4. It should be noted that the position of the butting interface 3 should be made visible even when the thin metal plate 4 is placed.

[0043] Next, as shown in FIG. 1, in the joining step, first, after positioning so that the probe portion 8 of the rotary tool 7 is disposed by shifting from the surface side of the thin metal plate 4 to the side of the metal member 1 with respect to the butting interface 3, the rotary tool 7 that rotates at a predetermined speed is press-fitted and moved along the butting interface 3 at a predetermined speed.

[0044] At this time, it is desirable to position the rotary tool 7 so that the outer periphery of the tip of the probe portion 8 is near and does not exceed the butting interface 3 of the metal member 1 and the resin member 2, that is, while bringing the outer peripheral end of the probe portion 8 as close as possible to the butting interface 3 without exceeding the butting interface 3.

[0045] As a result, as shown in FIG. 2, the metal member 1, the resin member 2, and the metal thin plate 4 are joined to each other by friction stir welding.

[0046] In the method of the present embodiment, the rotating tool 7 is press-fitted from the side of the metal thin plate 4 in a state of being shifted from the butting interface 3 toward the metal member 1 side and friction stir welded, so that the probe portion 8 of the rotating tool 7 contacts only the metal thin plate 4 and the metal member 1. At each joining interface 12 between the metal member 1 and the metal thin plate 4, the metal member 1 and the resin member 2, and the resin member 2 and the metal thin plate 4 in the joining structure 10, they are joined by the stirring effect, frictional heat, and the pressure of the tool. As a result, joining is performed without damaging the resin surface. In addition, since a large amount of heat can be applied to the resin while suppressing excessive contact between the side surface of the probe portion 8 and the resin, workability is improved by increasing the joining speed.

[0047] In particular, as shown in FIG. 1, the rotating tool 7 may be press-fitted in a state of being shifted from the butting interface 3 so that the outer periphery of the tip of the probe portion 8 coincides with the butting interface 3 between the metal member 1 and the resin member 2. Then, even if the outer diameter of the probe portion 8 changes, it is easy to position, and by approaching the butting interface 3 as much as possible, the necessary joining strength can be obtained while preventing damage to the resin surface.

[0048] Further, in the above joining step, the rotating tool 7 is press-fitted while pressing and supporting the flat surface of the backing metal 11 from the lower surface 6 side which is the back side of the butting interface 3, so that at least the lower surface 6 on the opposite side of the metal thin plate 4 becomes flat in the metal member 1 and the resin member 2 after the joining step. As a result, at least the lower surface 6 side has a flat and neat finish.

[0049] - Example - The metal member 1 is, for example, a magnesium alloy (AXS620) having a plate thickness of 2.0 mm × 75 mm × 150 mm.

[0050] The resin member 2 is, for example, a carbon fiber reinforced thermoplastic resin (CFRTP) with a plate thickness of 2.0 mm × 75 mm × 150 mm, and this carbon fiber reinforced thermoplastic resin is composed of 80% PA6 (polyamide 6) and 20% CF (carbon fiber).

[0051] The metal thin plate 4 is a magnesium alloy (AZ31) with a plate thickness of 1.0 mm × 75 mm × 150 mm.

[0052] The rotary tool 7 is, for example, a columnar shoulder part 9 formed of SKD (die steel), with an outer diameter of 15 mm, an outer diameter of the probe part 8 of 6 mm, and a length of the probe part 8 of 1.0 mm.

[0053] In this way, when the length of the probe part 8 is the same as the thickness of the metal thin plate 4, there is an advantage that it is easy to control the penetration depth of the probe part 8 and the penetration depth of the shoulder part 9.

[0054] The joining conditions are, for example, the rotational speed of the rotary tool 7 is 1000 - 3000 rpm, the joining speed is 100 - 300 mm / min, the penetration depth of the probe part 8 is 1.1 mm, and the penetration depth of the shoulder part 9 is 0.1 mm.

[0055] The position of the rotary tool 7 is moved so that the center of the rotary tool 7 is on the side of the metal member 1. That is, in the embodiment, by offsetting 3 mm, the outer periphery of the lower end of the probe part 8 coincides with the butting interface 3. The probe part 8 that rotates along the butting interface 3 is moved while maintaining an offset amount of 3 mm from the butting interface 3.

[0056] Figure 3 shows the joining conditions regarding the rotational speed and the joining speed of the rotary tool 7. When the rotational speed of the rotary tool 7 is high, the heat input becomes large, and when the joining speed is high, the heat input becomes small. Appropriate conditions are determined from this relationship. This is because if the heat input is too small, poor joining occurs in the metal member 1 and the resin member 2 and between the metal thin plate 4 and the resin member 2 joined by heat, and if the heat input is too large, the surface of the resin member 2 is destroyed by heat. Also, when the rotational speed of the rotary tool 7 is 1000 rpm, there is a problem that the heat input is too small and it becomes difficult to press-fit the probe portion 8. When the joining speed becomes as slow as 100 mm / min, a good joining state is achieved only when the rotational speed of the rotary tool 7 is 1500 rpm. When the rotational speed is 2000 rpm, since the joining speed is slow despite the very large heat input, the surface of the resin member 2 is destroyed by heat.

[0057] As described above, it was confirmed that a good joining structure can be obtained by setting the rotational speed of the rotary tool 7 to 1500 - 2000 rpm and the joining speed to 100 - 300 mm / min.

[0058] Photographs of Example 1, Example 2, and the comparative example are shown and explained below.

[0059] Example 1 Joining was performed with a shoulder diameter of 15 mm, a probe diameter of 6 mm, a probe length of 1 mm, a rotational speed of 2000 rpm, a joining speed of 300 mm / min, and an intrusion depth of 1.1 mm. The results are shown in FIGS. 5 to 7.

[0060] Example 2 Joining was performed with a shoulder diameter of 15 mm, a probe diameter of 6 mm, a probe length of 1 mm, a rotational speed of 1500 rpm, a joining speed of 300 mm / min, and an intrusion depth of 1.1 mm. The results are shown in FIG. 8.

[0061] As shown in the enlarged view in Fig. 6, the pointed portion on the right surface of the thin metal plate 4 is the contact portion of the shoulder portion 9. Due to the pressing force of the shoulder portion 9, the thin metal plate 4 is recessed into the resin member 2. Looking at Fig. 7, there is no such pointed portion on the left surface. When the diameter of the shoulder portion 9 is increased, its shape changes. Also, although it is not easy to see in the drawing, the molten resin member 2 may enter the slight gap between the back surface of the metal member 1 and the backing plate 11.

[0062] Fig. 8 is a cross-section regarding Example 2 in which the rotational speed is decreased from 2000 rpm to 1500 rpm. Also in this case, good joining results were obtained as in Example 1.

[0063] Fig. 4 shows the tensile test results of the joint in the joining parameters where a good joint was obtained. As shown in Fig. 5(a), the test piece was a rod-shaped one with a width of 15 mm centered on the joint in the joined material.

[0064] The maximum tensile test force of the joining structure was the highest at 1685 N when the rotational speed of the rotary tool 7 in Example 1 was 2000 rpm and the joining speed was 300 mm / min. This corresponds to 64% of the CFRTP base material strength in a test piece with a width of 15 mm and a plate thickness of 2.0 mm.

[0065] In the joining structure 10 shown in Figs. 5 to 7, the thin metal plate 4 plastically deformed by the rotary tool 7 flows at least partially into the resin member 2 side where it is at least partially melted.

[0066] The amount of the thin metal plate 4 flowing into the resin member 2 side is larger than the amount of the metal member 1 plastically deformed by the rotary tool 7 flowing into the resin member 2 side.

[0067] The metal member 1 and the resin member 2 have no particular problem even if the plate thickness is other than 2 mm, as long as the tool scanning conditions are changed. Even if the plate thickness of the thin metal plate 4 is other than 1 mm, there is no particular problem if the length of the probe portion 8 is changed according to the plate thickness or the scanning conditions are changed. In the above example, AXS620 is used as the metal member 1, but the same AZ31 as the thin metal plate 4 may be used.

[0068] In this way, the interface between the metal member 1 and the thin metal plate 4 is joined mainly by the stirring effect of the rotating tool 7, the interface between the resin member 2 and the thin metal plate 4 is joined mainly by the frictional heat of the shoulder portion 9 of the rotating tool 7 and the pressing force of the rotating tool 7, and the butt interface 3 between the metal member 1 and the resin member 2 is joined mainly by the stirring effect and frictional heat, resulting in a structure in which at least the underside 6 of the outer surfaces of the butted resin member 2 and metal member 1 has a flat surface without any irregularities.

[0069] Furthermore, since the probe portion 8 is press-fitted into the metal member 1, it does not have an excessive thermal effect on the resin member 2, and therefore the resin member 2 can be joined without being damaged.

[0070] In this embodiment, the plastically deformed thin metal plate 4 is joined in such a way that it flows into the molten resin member 2. This ensures a reliable joining after the resin member 2 hardens, and also provides a high joining strength that does not destroy the resin member 2, resulting in a joining structure that looks good.

[0071] Comparative Example 1 Welding was performed with a shoulder diameter of 15 mm, a probe diameter of 6 mm, a probe length of 2.5 mm, a rotation speed of 1000 rpm, a welding speed of 100 mm / min, an penetration depth of 2.6 mm, and the center position of the rotating tool 7 as the butt interface 3. The results are shown in FIG. 9. In the joint structure 110 according to this comparative example, a surface groove-like defect 112 exists in the surface photograph of FIG. 9. For this reason, the maximum joint tensile strength was significantly reduced. It was found that this is because the probe part 8 comes into direct contact with the resin member 2, and the resin member 2 is drawn into the surface of the thin metal plate 4 due to the stirring effect, which adversely affects the joint structure 110.

[0072] Comparative Example 2 Shoulder diameter: 15 mm, probe diameter: 6 mm, probe length: 2.5 mm, rotation speed: 1250 rpm, joining speed: 500 mm / min, penetration depth: 2.6 mm. The center position of the rotary tool 7 was offset 3 mm from the butting interface 3 toward the metal member side, the same as in Examples 1 and 2, and joining was performed. The results are shown in FIGS. 10 and 11. In the joining structure 110 according to this comparative example, surface groove-like defects 112 are present in the surface photograph of FIG. 10, and internal defects 113 are present in the cross-sectional photograph of FIG. 11. For this reason, the maximum joint tensile strength was significantly reduced. It was found that the heat input becomes small because the joining speed is too fast, and defects are likely to occur because the metal member 1 and the metal thin plate 4 are simultaneously agitated due to the influence of the penetration depth, which has an adverse effect on the joining structure 110.

[0073] Also, it is desirable that the metal member 1, the resin member 2, and the metal thin plate 4 are joined to each other in a state where the tip surface of the probe portion 8 penetrates in the range from 0.15 mm or less to 0.30 mm or less on the metal thin plate 4 side than the interface between the metal thin plate 4 and the metal member 1.

[0074] That is, when the tip surface of the probe portion 8 penetrates shallowly, separated by more than 0.15 mm from the interface between the metal thin plate 4 and the metal member 1 on the metal thin plate 4 side, sufficient joining strength cannot be obtained due to insufficient agitation of the metal thin plate 4. When the tip surface of the probe portion 8 penetrates deeper than 0.30 mm on the metal member 1 side than the interface between the metal thin plate 4 and the metal member 1, there is a risk that defects are likely to occur because the metal member 1 and the metal thin plate 4 are simultaneously agitated. Therefore, when the tip surface of the probe portion 8 penetrates to an appropriate position, the metal member and the resin member can be friction stir joined appropriately.

[0075] In the present embodiment, by approaching the butting interface 3 as close as possible without exceeding the butting interface 3, the resin surface can be prevented from being broken while obtaining the necessary joining strength.

[0076] Also, since the metal thin plate 4 thinner than the plate thicknesses of the metal member 1 and the resin member 2 is used, the metal member 1 and the resin member 2 can be friction stirred appropriately while preventing the resin member 2 from being broken.

[0077] Furthermore, since the resin member 2 is a thermoplastic resin, in the joining step, at least a part of the resin member 2 melts, and the plastically deformed metal thin plate 4 is joined to the metal member 1. After flowing into the resin member 2 side, it hardens and is joined.

[0078] As described above, according to the present invention, even when the side surfaces of the metal member 1 and the resin member 2 are butted and joined, it is possible to obtain the necessary joining strength while preventing the resin surface from being damaged by frictional heat or pressing force. In addition, a joining structure with a flat one side of the joining portion, good appearance, and high joining strength can be obtained.

[0079] Note that the above embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or uses.

Explanation of Reference Numerals

[0080] 1 Metal member 2 Resin member 3 Butting interface 4 Metal thin plate 5 Upper surface 6 Lower surface 7 Rotating tool 8 Probe portion 9 Shoulder portion 10 Joining structure 11 Backing metal 12 Joining interface 110 Joining structure 112 Surface groove-like defect 113 Internal defect

Claims

1. A butting step of butting the side surfaces of a metal member and a resin member having the same plate thickness against each other at an interface; A superimposing step of superimposing a thin metal plate on one flat surface formed by the butted metal member and resin member; A joining step in which a rotating rotary tool is press-fitted and moved along the butting interface by shifting the probe portion of the rotary tool from the surface side of the thin metal plate to the metal member side beyond the butting interface, whereby the metal member, the resin member, and the thin metal plate are joined to each other. A method for joining a metal member and a resin member, characterized by the above.

2. A method for joining a metal member and a resin member according to Claim 1, wherein the rotary tool is press-fitted and moved along the butting interface with the tip outer periphery of the probe portion shifted from the butting interface so as to be in the vicinity of and not exceeding the butting interface between the metal member and the resin member. A method for joining a metal member and a resin member, characterized by the above.

3. A method for joining a metal member and a resin member according to Claim 1 or 2, wherein the rotary tool is press-fitted and moved along the butting interface with the tip outer periphery of the probe portion shifted from the butting interface so as to coincide with the butting interface between the metal member and the resin member. A method for joining a metal member and a resin member, characterized by the above.

4. A method for joining a metal member and a resin member according to any one of Claims 1 to 3, wherein in the joining step, the rotary tool is press-fitted and moved along the butting interface while pressing and supporting the flat surface of a backing metal from the back side of the butting interface, whereby at least the opposite side of the thin metal plate is made flat in the metal member and the resin member after the joining step. A method for joining a metal member and a resin member, characterized by the above.

5. A method for joining a metal member and a resin member according to any one of Claims 1 to 4, wherein a thin metal plate thinner than the plate thicknesses of the metal member and the resin member is used. A method for joining a metal member and a resin member, characterized by the above.

6. A method for joining a metal member and a resin member according to any one of Claims 1 to 5, The resin member is a thermoplastic resin. In the joining step, at least a part of the resin member melts, and the plastically deformed metal thin plate is joined to the metal member. After flowing into the resin member side, it hardens and is joined. A method for joining a metal member and a resin member, characterized in that.

7. A method for joining a metal member and a resin member according to any one of Claims 1 to 6, in the joining step, the tip surface of the probe part penetrates into the range from 0.15 mm or less on the metal thin plate side to 0.30 mm or less on the metal member side from the interface between the metal thin plate and the metal member, and the metal member, the resin member, and the metal thin plate are joined to each other. A method for joining a metal member and a resin member, characterized in that.

8. A method for joining a metal member and a resin member according to any one of Claims 1 to 7, the length of the probe part is the same as the thickness of the metal thin plate A method for joining a metal member and a resin member, characterized in that.

9. A method for joining a metal member and a resin member according to any one of Claims 1 to 8, in the joining step, the rotation speed of the probe part is 1500 rpm or more and 2000 rpm or less, and the joining speed is 100 mm / min or more and 300 mm / min or less. A method for joining a metal member and a resin member, characterized in that.

10. The side surfaces of a metal member and a resin member having the same plate thickness are butted against each other at the interface. With a metal thin plate overlapped on one flat surface formed by the metal member and the resin member, a rotating tool is press-fitted from the surface side of the metal thin plate and moved along the butted interface, whereby the metal member, the resin member, and the metal thin plate are joined to each other. A joined structure of a metal member and a resin member, the metal thin plate plastically deformed by the rotating tool flows into and is joined to at least a part of the melted resin member side, the amount of the metal thin plate flowing into the resin member side is larger than the amount of the metal member plastically deformed by the rotating tool flowing into the resin member side. A joined structure of a metal member and a resin member, characterized in that.

11. A joined structure of a metal member and a resin member according to Claim 10, the joined part of the metal member and the resin member is flat at least on the opposite side of the metal thin plate. A joined structure of a metal member and a resin member, characterized in that.

Images