JP2011005507A - Method and device for joining metallic members and structure in joined part of metallic members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for joining metallic members and the structure in the joined part which has high mechanical strength without imparting heat energy from the outside and without using parts other than the metallic members to be joined.SOLUTION: By superimposing a first metallic member 11 on a second metallic member 12 having an open hole 12a which is extended from the surface on one side toward the surface on the opposite side, and by pressing a working tool 13 made of stainless steel having a flat surface on the top to the surface of the first metallic member and rotating it, deformation stress of the first metallic member 11 is lowered by utilizing friction stir. By filling the open hole 12a of the second metallic member 12 by plastic flow, the first metallic member 11 and the second metallic member 12 are joined together.

Description

  The present invention relates to a method and a bonding apparatus for bonding metal members to each other by a friction stir process technique, and a metal member connection structure.

  As a method of joining metal members, welding and riveting are widely used when it is not necessary to disengage the joint, and fastening with bolts and nuts is widely used when it is necessary to disengage the joint as necessary. ing. Welding and riveting that are used when it is not necessary to disengage the joint can obtain a highly reliable joint structure with a joint method with a long history, but has the following problems. That is, welding requires a welding rod in addition to the metal member to be joined, and there is a problem that the quality of the joined portion depends on the skill of the operator and that joining takes time. In addition, rivet tightening requires a rivet in addition to the metal member to be joined, and one end or both ends of the rivet must be caulked by mechanical force.

  As a method of joining the two metal members by using a pair of metal members, a metal having a property that deformation resistance is reduced by friction stirring is used as one of the metal members to be joined, and the one metal member protrudes in the center. Friction heat is generated by pressing while rotating the probe provided with, and by this heat, one metal member is plastically flowed into a recess having a cross-sectional area that increases in the depth direction formed on the other metal member. A method of joining both metal members (Patent Document 1) has been proposed. This joining method has the advantage that it requires no parts other than the metal members to be joined and can be joined in a very short time, and is an epoch-making joining method compared to the prior art. However, the coupling method disclosed in Patent Document 1 has the following technical problems to be solved, and its practical application is delayed. The first problem is that a probe used for reducing deformation resistance of one metal member by friction stirring has a pin protruding in the center, and a spherical portion recessed toward one metal member is formed at the base of the pin. Therefore, a pin hole remains in the center of one metal member plastically flowed in the recess of the other metal member, the cross-sectional area of the one metal member in the recess is reduced, and the bonding strength is reduced. It is that it becomes lower. The second problem is that since the probe has the shape described above, the surface of one metal member in the vicinity of the coupling portion has a shape determined by the pin and the spherical portion of the probe, impairing the aesthetic sense, and adhering to dust and moisture. There are problems such as causing corrosion, and there is a problem that requires further finishing to prevent these problems. The third problem is that when one metal member and the other metal member are made of different metals, there is a high possibility that corrosion will occur at the joint depending on the use environment, and how to prevent this. It is.

JP 2004-106037 A

An object of the present invention is to provide a metal member coupling method, a coupling device, and a coupling unit structure that provide a coupling portion having high mechanical strength without using parts other than the metal members to be coupled.
Another object of the present invention is to provide a method of joining metal members, a joining device, and a joining portion structure that provide a joining portion having an aesthetic appearance.
Another object of the present invention is to provide a metal member bonding method, a bonding apparatus, and a bonding portion structure in which corrosion problems do not occur even when different metal members are bonded.
Further objects of the present invention will become apparent from the description of the embodiments.

  A feature of the method of joining the metal members of the present invention is that the step of superimposing the first metal member and the second metal member having an opening, the surface of the first metal member is larger than the opening at the tip. The step of rotating the processing means by pressing the front end of the processing means having a flat surface, the deformation resistance of the first metal member is lowered by the frictional heat caused by the rotation, and the plastic flow is made in the opening of the second metal member. It is in the point provided with a process. When the processing means having a flat surface larger than the opening of the first metal member is pressed to the tip and the processing means is rotated, frictional heat is generated, and the portion of the first metal member that contacts the processing means by this frictional heat. When the temperature of the first metal member rises, plastic flow develops under low stress, and the surrounding area where the plastic flow of the first metal member does not appear serves as a stopper, and the first metal member opens in the opening of the second metal member. A metal member will flow in. At this time, since the tip of the processing means has a flat surface larger than the opening of the first metal member, the dimension of the surface of the first metal member can be reduced by plastic flow, and the joint portion having high mechanical strength can be obtained. And a joint structure having an aesthetic appearance can be obtained. The opening of the second metal member preferably has a shape having a larger cross-sectional area in a direction perpendicular to the pressing direction of the processing means than the side closer to the first metal member in order to increase the bonding strength. The pressing force applied to the surface of the first metal member and the rotational speed of the processing means need to be set to values sufficient to cause plastic flow in the region in contact with the processing means of the first metal member.

  The first metal member used in the method for bonding the metal members of the present invention is not limited to these, but magnesium alloys and aluminum alloys are preferred. Examples of magnesium alloys include magnesium alloys containing at least one kind of aluminum Al, zinc Zn, zirconium Zr, manganese Mn, lithium Li, iron Fe, silicon Si, copper Cu, nickel Ni, calcium Ca, and rare earth elements. Examples of the aluminum alloy include an aluminum alloy containing at least one kind of copper Cu, manganese Mn, silicon Si, magnesium Mg, zinc Zn, nickel Ni, chromium Cr, and titanium Ti.

  Another feature of the method for joining the metal members of the present invention is that the first metal member and the second metal member having an opening and a material different from the first metal member are interposed via the insulating film. A step of superimposing, a step of rotating the processing means by pressing the front end portion of the processing means having a flat surface larger than the opening at the front end on the surface of the first metal member, frictional heat generated by the rotation of the first metal member It is in the point provided with the process of reducing a deformation resistance and carrying out plastic flow in the opening of the 2nd metal member. Bonding the first metal member and the second metal member in an electrically insulated state by using an insulating material having heat resistance that can withstand frictional heat and rigidity and toughness that does not break during plastic flow. In other words, dissimilar metals can be bonded without causing electromigration.

  The feature of the apparatus for joining the metal members of the present invention is that the first metal member and the second metal member having an opening are superposed and held, and the tip of the second metal member is opened at the tip. A processing means having a large flat surface, a means for rotationally driving the processing means, a means for moving at least one of the holding means and the processing means along a line connecting the two means, and a processing means for the surface of the first metal member And a means for pressing. With this configuration, the metal members can be coupled to each other by using the plastic flow of one metal member without applying heat energy from the outside and without using components other than the metal members to be coupled.

The processing means used in the apparatus for joining the metal members of the present invention is required to have low heat resistance, wear resistance, and wettability (does not adhere to the workpiece), and a specific material is stainless steel (for example, SUS steel). ), Tool steel (for example, SK steel), superalloy (Ni-based, Fe-based, Co-based), ceramics (CBN (cubic boron nitride), ZrO ₂ , SiC, Si ₃ N ₄ , SiALON, Al ₂ O ₃ Y ₂ O ₃ and composite materials thereof), and composite materials of metals and ceramics (for example, cermet) can be used.

  The feature of the coupling part structure of the metal member of the present invention is that the first metal member and the second metal member having the opening are partially opened by the second metal member. The surface opposite to the second metal member of the first metal member corresponding to the opening is a flat surface, and the region adjacent to the flat surface is a fine structure as compared with the other. It is in the point. Thus, since the surface opposite to the second metal member of the first metal member corresponding to the opening is a flat surface, it is possible to realize a joint portion that is excellent in aesthetics and does not cause a corrosion problem. Furthermore, since the region adjacent to the flat surface has a fine structure as compared with other regions, a joint having excellent mechanical properties can be realized. This connecting portion is suitable for connecting metal members used in portable information terminals, home appliances, automobile parts, railway vehicles, and the like.

Another feature of the metal member coupling portion structure of the present invention is that the first metal member and the second metal member having an opening and a material different from the first metal member are the first metal. An insulating film is interposed at the place where the member and the second metal member are in contact with each other, and a part of the first metal member is coupled in a state of filling the opening of the second metal member, and corresponds to the opening. The surface of the first metal member opposite to the second metal member is a flat surface, and a region adjacent to the flat surface has a fine structure as compared with other regions. . As a result, it is possible to realize a joint structure that has excellent mechanical properties and does not cause electromigration.

  According to the method for joining metal members of the present invention, the first metal member develops plastic flow using frictional heat and flows into the opening of the second metal member, and the first metal member instantly And the second metal member can be combined. Further, in the connecting structure of the metal member of the present invention, the surface opposite to the second metal member of the first metal member corresponding to the opening is a flat surface, and the region adjacent to the flat surface is compared with other regions. In addition, since it has a fine structure, it is possible to provide a joint structure with excellent aesthetics and high mechanical strength. Furthermore, since the apparatus for joining the metal members of the present invention has the processing means having a flat surface larger than the opening of the second metal member at the tip, the surface of the first metal member that contacts the flat surface of the processing means. Since the region can be flattened and the surface region of the first metal member that is in contact with the flat surface of the processing means has a finer structure than the other regions, a joint having excellent mechanical properties can be realized. .

It is a schematic sectional drawing explaining the method to couple | bond the metal member of this invention. It is a block diagram explaining the process of the method of combining this invention metal member. It is a schematic enlarged view explaining the effect | action of the method of combining this invention metal member. It is a general | schematic cross-sectional degree explaining the point which is excellent in the mechanical characteristic of the coupling | bond part formed by the method of couple | bonding the metal member of this invention. It is a microscope picture which shows the structure | tissue state of the flat part formed in the 1st metal member surface by the method of couple | bonding the metal member of this invention. It is the front view and top view which show the Example which made the opening of the 2nd metal member used for the method of combining this invention metal member circular. It is the front view and top view which show the Example which made the opening of the 2nd metal member used for the method of combining this invention metal member elliptical. It is the front view and top view which show the Example which made the opening of the 2nd metal member used for the method of couple | bonding the metal member of this invention a rectangle. It is a schematic sectional drawing which shows the modification of the opening of the 2nd metal member used for the method of combining this invention metal member. It is a schematic sectional drawing which shows the Example in the case of couple | bonding a dissimilar metal using the method of couple | bonding the metal member of this invention. It is a schematic sectional drawing which shows a different Example in the case of couple | bonding dissimilar metals using the method of couple | bonding this invention metal member. It is the schematic front view and side view which show an example of the coupling | bonding apparatus used in order to implement the method of couple | bonding the metal member of this invention. It is a schematic sectional drawing which shows the modification of the processing jig used for the method of combining this invention metal member.

The best embodiment of the method for joining metal members of the present invention is formed from one surface to the opposite surface, and the cross-sectional area parallel to one surface is larger on the opposite surface than the one surface. The first metal member is superposed on the second metal member having the opening and the stainless steel processing jig having a flat surface at the tip is pressed and rotated on the surface of the first metal member. The first metal member and the second metal member are joined by lowering the deformation resistance of the metal member by frictional stirring and filling the opening of the second metal member by plastic flow. Magnesium and magnesium-based alloys are lightweight metal materials and tend to be widely used as metal parts for portable information terminals, home appliances, automobile parts, railway vehicles, etc., but the method of joining by welding or brazing is not applicable There are points, and the problem to be solved remains in the spread. The present invention can solve this problem.

  1 and 2 are process diagrams showing an embodiment of a method for joining metal members of the present invention. In FIG. 1, 11 is a plate-like first metal member, and 12 is a thickness from one surface to the other surface. A plate-like second metal member having an opening 12a having a shape in which a cross-sectional area in a direction perpendicular to the vertical direction is increased and coupled to the first metal member 11, and a second metal member 13 at the tip. A processing jig having a circular outer cross section having a flat portion 13a having an area larger than the twelve apertures 12a, and a holding jig for rotatably supporting the processing jig 13. The processing jig 13 is rotated by a rotation drive source and has means for pressing the flat portion 13a at the tip with a predetermined pressure in the arrow direction. When the first metal member 11 and the second metal member 12 are joined, the first metal member 11 is placed above the side of the opening 12a of the second metal member 12 where the cross-sectional area is small. A processing jig 13 having a flat portion having a larger area than the opening 12a of the second metal member 12 at the tip is prepared while being placed on a holding table (not shown) (step A in FIG. 2). It is made to oppose the surface of the 1st metal member 11 corresponding to this opening 12a (a of FIG. 1). Next, the flat portion 13a at the tip is pressed against the surface of the first metal member 11 with a predetermined pressure while rotating the processing jig 13 (step B in FIG. 2). When the flat portion 13a at the tip is pressed against the surface of the first metal member 11 while rotating the processing jig 13, the surface of the first metal member 11 in contact with the flat portion 13a at the tip of the processing jig 13 The temperature of the structure of the region rises due to frictional heat, and the first metal member 11 is softened. The first metal member 11 is easily stirred by the rotation of the processing jig 13 under pressure, and is in a high strain processing state. Refine. The microstructure thus refined exhibits a superplastic phenomenon that facilitates plastic deformation at high temperatures. Due to the development of the superplastic phenomenon, plastic flow occurs, and further, even in a non-miniaturized region, it softens and plastically flows under high temperature conditions. As will be described later, the plastic flow flows toward the opening 12a of the second metal member 12 (step C of FIG. 2), and the opening 12a of the second metal member 12 as shown in FIG. 1B. Fill the space inside. Thereafter, pressing and rotation of the processing jig 13 is stopped, and the processing jig 13 is separated from the surface of the first metal member 11 (step D in FIG. 2). As a result, a part of the first metal member 11 as shown in FIG. 1C flows into the opening 12a of the second metal member 12, and the first metal member 11 corresponding to the opening 12a. A combined structure in which a slightly concave flat surface 11a formed by the flat portion 13a at the tip of the processing jig 13 is formed on the surface can be realized.

  The reason why the first metal member 11 and the second metal member 12 are joined by plastic flow will be described with reference to FIG. FIG. 3 is an enlarged view of FIG. 1B, and a superplastic phenomenon occurs in the vicinity of the surface of the region 111 of the first metal member 11 in contact with the flat portion 13 a at the tip of the processing jig 13. The region far from the surface of the region 111 is softened due to the temperature rise due to frictional heat and the deformation resistance is lowered, and the plastic flow in the Y11 direction indicated by the black arrow is generated in the region. A portion where the deformation resistance of the region 111 is lowered is pressed by the processing jig 13 and the holding jig 14 in the directions of the arrows Y13 and Y14, and the side thereof is surrounded by the surrounding region 112 that does not develop a superplastic phenomenon. Surrounded and pressed in the Y12 direction, the direction of the opening 12a of the second metal member 12 becomes the only flow direction. While the friction stirring by the processing jig 13 is continued, the plastic flow is continuously performed until the entire space of the opening 12a is filled.

An important matter in the method for joining the metal members of the present invention is the setting of processing conditions. When processing magnesium, magnesium-based alloy, aluminum, and aluminum-based alloy as a workpiece metal member at room temperature, the rotation speed of the processing jig is 200 to 20000 rpm, preferably 500 to 5000 rpm, and the indentation pressure is preferably 50 kg / cm ² or more. .

  The point that the mechanical property of the joint formed by the method of joining the metal members of the present invention is excellent with reference to FIGS. 4 and 5 will be described. The region of the first metal member 11 frictionally stirred by the processing jig 13, that is, the surface of the first metal member 11 indicated by hatching in FIG. 4 is formed by the flat portion 13 a at the tip of the processing jig 13. The slightly concave flat surface 11a and side surfaces are made finer (expression of dynamic recrystallization or the like) than other regions as shown in FIG. FIG. 5 is a photomicrograph showing the structural state of the first metal member 11 at the portion indicated by the circles in FIG. As the structure is refined, the mechanical properties generally improve. In the region corresponding to the 12 apertures 12 a of the first metal member 11, stress concentration as a coupling portion occurs, and mechanical damage often occurs in this region. When the metal member is bonded by the method of the present invention, the upper surface portion of the region where the stress concentration occurs becomes a refined structure, so that the mechanical strength of the bonded portion can be improved. When the tensile strength of the joint was measured, it was confirmed that the joint had a strength 1.5 times that of the joint shown in Patent Document 1.

  FIG. 6 is a front view and a plan view showing an embodiment in which the opening 12a of the second metal member 12 is circular in order to obtain a rotatable coupling portion. The cross-sectional shape of the opening 12a parallel to the upper surface or the lower surface of the second metal member 12 is a perfect circle in the entire depth direction. For this reason, even if the 1st metal member 11 and the 2nd metal member 12 are combined when the 1st metal member 11 flows into opening 12a, since opening 12a is a perfect circle, the axis of opening 12a Rotation is possible around the heart. When the rotation of the coupling portion is expected, the surface of the opening 12a is mirror-finished or the coefficient of thermal expansion of the first metal member 11 is made larger than that of the second metal member 12, and coupling using frictional heat is used. It is desirable to create a gap between the two after the process.

  FIGS. 7A and 7B are a front view and a plan view showing an embodiment in which the opening 12a of the second metal member 12 is elliptical in order to obtain a joint portion that does not rotate. The cross-sectional shape of the opening 12a that is parallel to the upper surface or the lower surface of the second metal member 12 is elliptical. For this reason, when the first metal member 11 and the second metal member 12 are joined by flowing the first metal member 11 into the opening 12a, the opening 12a is elliptical, and therefore the axis of the opening 12a. Can no longer rotate around the center. The oval shape is an example, and any shape other than a perfect circle may be used. It is conceivable to provide a convex portion, a concave portion, a flat portion, or the like in a part of the perfect circle, or to form a triangle, a quadrangle, or a polygon. Further, it is desirable to form a portion that is not a perfect circle in the entire depth direction of the opening 12a, but if it is formed in a part thereof, rotation can be prevented.

  FIG. 8 is a front view and a plan view showing an embodiment in which the opening 12a of the second metal member 12 is rectangular. One of the two opposite sides of the rectangular opening 12a is formed in parallel with the width direction of the second metal member 12, and the other is formed perpendicular to the width direction. Making the opening 12a rectangular is a preferable shape next to a circle in order to fill the first metal member 11 in the entire area of the opening 12a by plastic flow, and has an effect of increasing the bonding strength. In this embodiment, if the opening 12a is rectangular and the longitudinal direction thereof is arranged in the width direction of the second metal member 12, the first metal member 11 and the second metal member are in a direction perpendicular to the width direction. There is an advantage that the strength when pulling 12 can be increased.

  FIG. 9 is a schematic sectional view showing a modification of the shape of the opening 12a of the second metal member 12. As shown in FIG. (A) gives a curvature to the end portion of the opening 12a indicated by a circle on the first metal member 11 side so that the first metal member 11 easily flows into the opening 12a by plastic flow. . In order to realize a high-strength joint portion, it is desirable that the first metal member 11 is filled in the opening 12a without any gap, and this modification realizes a high-strength joint portion. In (b), the opening 12a is not a through hole but a bottomed opening.

  FIG. 10 is a schematic front view and a side view showing an embodiment in the case where different metals are bonded using the method for bonding metal members of the present invention. When dissimilar metals are brought into contact, there is a problem that corrosion occurs at the contact portion due to the electromigration phenomenon and it progresses to the whole, and when dissimilar metals are bonded using the method for bonding metal members of the present invention, electromigration is caused. Countermeasures are required. In this embodiment, the second metal member 12 made of, for example, iron and the first metal member 11 made of, for example, aluminum are overlapped with a fluorocarbon resin film 15 such as polytetrafluoroethylene interposed therebetween ( a) The state in which the fluorocarbon resin film 15 is interposed between the second metal member 12 and the first metal member 11 by pressing and rotating the processing jig 13 from the first metal member 11 side. While maintaining, the first metal member 11 is guided and filled into the opening 12a of the second metal member 12 by plastic flow, and the first metal member 11 and the second metal member 12 are filled with the fluorocarbon resin film 15. (B) realizes a coupling part structure that is electrically insulated by the above. In this embodiment, the fluorocarbon resin film 15 is used for electrical insulation between the first metal member 11 and the second metal member 12, but this is heat resistant to withstand frictional heat and does not break during plastic flow. Since this is a preferable material as an insulating material having rigidity and toughness, the present invention is not limited to this, and other organic materials can also be used. Further, it is sufficient that the fluorocarbon resin film 15 is disposed at a place where at least the first metal member 11 and the second metal member 12 overlap each other. In this case, it is preferable to provide a curvature to the end of the opening 12a of the second metal member 12 on the first metal member 11 side in order to prevent the fluorocarbon resin film 15 from being damaged.

  FIG. 11 is a schematic cross-sectional view showing a different embodiment when different metals are bonded using the method for bonding metal members of the present invention. An insulating film 16 is formed in advance on the entire surface including the opening 12a of the second metal member 12, and the first metal member 11 is overlaid and bonded using plastic flow to thereby form the first metal. The member 11 and the second metal member 12 are coupled in an electrically insulated state. As the insulating film 16, a material selected from an organic insulator having heat resistance and an inorganic insulator can be used. As a method of forming the insulating film 16, for example, in the case of an organic insulator, it is immersed in an organic insulating liquid, or by spraying the organic insulating liquid, and in the case of an inorganic insulator, it is placed in an oxidizing atmosphere. It is conceivable to form a film by a CVD method or to apply a liquid inorganic mixture.

  FIG. 12 is a schematic front view and a side view showing an example of a connecting device used for executing the method for connecting the metal members of the present invention. In the figure, 51 is a base on which the apparatus is installed, 52 is a frame fixed to the base 51, 53 is a work holding head supported by the frame 52 so as to be movable in the XY direction on a horizontal plane, and 531 is a work holding head 53. A temperature / pressure sensor 54 embedded in the vicinity of the surface is driven by a drive motor (not shown) with a drive shaft that moves the work holding head 53 in the vertical direction. 55 is a work holder supported by the work holding head 53, 56 is a rotary tool composed of the processing jig 13 and the holder 14 having the flat portion 13a at the tip shown in FIG. 1, 57 is a tool holder for holding the rotary tool 56, 58 is a tool holder driving motor for supporting the tool holder 57 and moving the tool holder 57 in the vertical direction, 581 is a constant speed / low load control device supported by the tool holder driving motor, 59 is supported by the frame 52, This is a tool rotation motor that supports the holder drive motor 58 and drives the rotation tool 56 to rotate. The rotary tool 56 may be only the processing jig 13 of FIG.

  When the first metal member 11 and the second metal member 12 are coupled using the coupling device having such a configuration, the second metal member 12 is placed on the work holder 55 with the first metal member 11 facing up. The first jig corresponding to the opening 12a of the second metal member 12 is moved in the XY direction by attaching the processing jig 13 having the flat portion 13a at the tip to the work holding head 53. The surface position of the metal member 11 is opposed to the rotary tool 56. Next, the tool holder 57 is moved downward by the tool holder drive motor 58 while rotating the rotary tool 56 by the tool rotation motor 59, and the rotary tool 56 is brought into contact with the surface of the first metal member with a predetermined pressure. As a result, a plastic flow occurs due to the occurrence of a superplastic phenomenon on the surface of the first metal member 11 due to frictional heat, and softening occurs at a location away from the surface under high temperature conditions. The plastic flow is generated from the first metal member 11 toward the opening 12 a, and the opening 12 a is filled with the first metal member 11. When the opening 12a is filled with the first metal member 11, the tool holder 57 is moved upward by the tool holder drive motor 58 to separate the rotary tool 56 from the first metal member 11, and the tool rotation motor 59 is stopped. Then, the rotation tool 56 is stopped.

  Pressure control and position control can be used as a control method for bringing the rotary tool 56 into contact with the surface of the first metal member at a predetermined pressure. Although pressure control has the advantage that stable boss height control is possible by a constant load, there is a drawback that the system configuration is complicated. Specifically, it is realized by mounting a strain gauge and a load cell on a stage and a rotating shaft. In addition, a change in the load applied during boss molding can be considered due to thermal effects, and this countermeasure is necessary. Position control can be realized by controlling the stage and the rotation axis with a servo motor or the like, and has an advantage that the control is relatively easy.

  FIG. 13 is a schematic cross-sectional view showing a modified example of the processing jig 13 used in the method for joining metal members of the present invention. An annular protruding portion 13 a 1 is formed around the flat portion 13 a at the tip of the processing jig 13. The ring-shaped protruding portion 13a1 has a portion in which the deformation resistance is reduced in the peripheral direction when superplasticity develops in a portion that contacts the flat portion 13a at the tip of the processing jig 13 of the first metal member 11 due to frictional heat. It is intended to prevent the flow. As a result, since all the portions with reduced deformation resistance can be used to fill the openings 12a of the second metal member 12, the flat surface 11a that is slightly concave formed by the flat portion 13a of the first metal member 11 is used. The amount of the dent is reduced, the appearance of the joint becomes beautiful, and there are effects such as measuring the improvement of the mechanical strength of the joint. If the height of the protruding portion 13a1 is large, the strength of the coupling portion is lowered, so that it is preferably about 0.1 to 0.2 mm.

  The method and apparatus for joining the metal members of the present invention and the joint structure of the metal members manufactured thereby are not limited to the methods and configurations described in the embodiments, but are within the scope of the technical idea of the present invention. Various modifications are possible.

  DESCRIPTION OF SYMBOLS 11 ... 1st metal member, 11a ... Flat part, 12 ... 2nd metal member, 12a ... Open hole, 13 ... Processing jig, 13a ... Flat part, 14 ... Holding jig.

Claims (7)

  A step of superimposing a first metal member and a second metal material having an opening; pressing a tip of a processing means having a flat surface larger than the opening at the tip on the surface of the first metal member; A step of rotating the processing means, and a step of plastically flowing into the opening of the second metal member by reducing a deformation resistance of the first metal member by frictional heat generated by the rotation. A method of joining metal members.   A step of superimposing a first metal member and a second metal member having an opening and having a material different from the first metal member through an insulating film, on a surface of the first metal member, at a tip; A step of rotating the processing means by pressing the tip of the processing means having a flat surface larger than the opening; and the second metal by reducing the deformation resistance of the first metal member by frictional heat generated by the rotation. A method of joining metal members, comprising the step of plastically flowing into the openings of the members.   The opening of the second metal member has a shape having a larger cross-sectional area in a direction perpendicular to the pressing direction of the heating means than a side closer to the first metal member. Or the method of couple | bonding the metal member of 2.   The pressing force applied to the surface of the first metal member and the rotational speed of the processing means are values that cause plastic flow in a region in contact with the processing means of the first metal member. A method for joining metal members according to item 1.   Means for superimposing and holding the first metal member and the second metal member having an opening, processing means having a flat surface larger than the opening at the tip, means for rotationally driving the processing means, A metal member comprising: means for moving at least one of the holding means and the processing means along a line connecting the means; and means for pressing the processing means against the surface of the first metal member. Device to join.   A first metal member and a second metal member having an opening are coupled in a state where a part of the first metal member fills the opening of the second metal member, and the opening is formed in the opening. The surface of the corresponding first metal member opposite to the second metal member is a flat surface, and a region adjacent to the flat surface has a fine structure as compared with other regions. A metal part connection structure characterized by that.   The first metal member and the second metal member having an opening and a material different from the first metal member are in contact with the first metal member and the second metal member. An insulating film is interposed, and the first metal member is partly joined in a state in which the opening of the second metal member is filled, and the second of the first metal member corresponding to the opening. The metal member connecting portion structure characterized in that a surface opposite to the metal member is a flat surface, and a region adjacent to the flat surface has a fine structure as compared with other regions.

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