JP2019076947A - Jointing method and manufacturing method for composite rolling material - Google Patents

Abstract

To provide a jointing method which enables a suitable joint of different kinds of metal members, and a manufacturing method for a composite rolling material.SOLUTION: This manufacturing method includes a preparation step of preparing a first metal member 1 comprising an end face 1a and a second metal member 2 which comprises an end surface 2a and has a melting point higher than the first metal member 1, a butting step of forming a butting part J1 by butting end faces 1a, 2a of the first metal member 1 and the second metal member 2 with each other, and a joint step of jointing the first metal member 1 and the second metal member 2 by inserting the agitation pin F2 of a rotary tool being rotating only from the surface 1b of the first metal member 1, and by relatively displacing the rotary tool F along the butting part J1 with only the agitation pin F2 in contact with at least the first metal member 1 while the rotary center shaft of the rotary tool F is being inclined on the side of the first metal member 1 with respect to the butting part J1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bonding method and a method of manufacturing a composite rolled material.

  For example, Patent Document 1 discloses a technology in which metal members of different materials are friction-stirred with a rotating tool. In the conventional bonding method, the end surfaces of the metal members are obliquely cut. Therefore, the butt parts formed by abutting the end faces are also oblique. In the bonding step, the rotary tool is inserted into the first metal member having a melting point lower than that of the second metal member, and friction stirring is performed along the abutment portion. In the bonding step, since the inclination angle of the butting portion and the taper angle of the stirring pin are the same, it is avoided that the first metal member and the second metal member of different materials are mixed in the bonding step. be able to.

JP, 2016-150380, A

  In the conventional bonding method, there is a problem that the process of forming the end faces of the first metal member and the second metal member obliquely becomes complicated.

  From such a point of view, it is an object of the present invention to provide a bonding method and a method of manufacturing a composite rolled material which can suitably bond different types of metal members.

  In order to solve such problems, the present invention is a joining method of joining a pair of metal members of different materials using a rotary tool provided with a tapered stirring pin, which comprises a first metal member provided with an end face Providing a second metal member having an end surface and having a melting point higher than that of the first metal member, and forming a butt portion by abutting the end surfaces of the first metal member and the second metal member And inserting the stirring pin of the rotating tool to be rotated from only the surface of the first metal member, and inclining the rotation center axis of the rotating tool toward the first metal member with respect to the butting portion Bonding the first metal member and the second metal member by relatively moving the rotary tool along the abutment portion with only the stirring pin in contact with at least the first metal member; , Characterized in that it contains.

  Further, the present invention is a method for producing a composite rolled material formed of a pair of metal members different in material, comprising: a first metal member provided with an end face; and an end face, which has a melting point than the first metal member. A preparation step of preparing a high second metal member and a rotary tool having a tapered stirring pin, and a butt step of butting the end faces of the first metal member and the second metal member to form a butt portion The stirring pin of the rotating tool to be rotated is inserted from only the surface of the first metal member, and the stirring is performed while the central axis of rotation of the rotating tool is inclined toward the first metal member with respect to the abutment portion. Bonding the first metal member and the second metal member by relatively moving the rotary tool along the abutment portion in a state where at least the pin is in contact with the first metal member; In the process Said metal member to each other, which is engaged, characterized in that it comprises a and a rolling step of rolling the joint line as the rolling direction.

  According to this bonding method, since it is not necessary to form the end faces of the metal members diagonally as in the prior art, the manufacturing cost can be reduced. Further, by inclining the rotation center axis of the rotating tool toward the first metal member, the contact between the rotating tool and the second metal member can be avoided, and the first metal member of a different material is used in the bonding step. It can prevent that a 2nd metal member is mixed. In addition, since the shoulder portion of the rotary tool is not brought into contact with the first metal member and the second metal member, the amount of heat input to the first metal member and the second metal member can be suppressed. Further, for example, if the rotary tool is inserted so as to contact only the first metal member, the joining condition can be adjusted according to the first metal member having a low softening temperature, and the heat input can be suppressed. Therefore, it can suppress that a 1st metal member softens largely and a burr | flash generate | occur | produces excessively, and can prevent the joining defect by metal lack.

  Further, since the shoulder portion of the rotary tool is not in contact with the first metal member and the second metal member, the frictional resistance can be reduced, and the load on the rotary tool or the friction stir device can be reduced. Furthermore, since the shoulder portion of the rotating tool is not in contact with the first metal member and the second metal member, it is possible to prevent the rotating tool from becoming hot. This facilitates material selection of the rotating tool and can prolong the life of the rotating tool.

  When the taper angle between the rotation center axis and the outer peripheral surface of the stirring pin is the angle α, the rotation center axis is an angle α toward the first metal member with respect to the butt joint in the bonding step. It is preferable to make it incline.

  According to this joining method, the outer peripheral surface of the stirring pin and the butting portion can be made as close as possible without contacting each other.

  Further, the first metal member is formed of aluminum or an aluminum alloy, the second metal member is formed of copper or a copper alloy, and in the bonding step, the stirring pin of the rotating tool that rotates is the first metal member. The insert is made only from the surface of the above, and while the central axis of rotation of the rotary tool is inclined toward the first metal member, only the stirring pin is in contact with only the first metal member, It is preferable to move the rotating tool relative to one another.

  According to this bonding method, the metal member made of copper or copper alloy and the metal member made of aluminum or aluminum alloy can be suitably bonded.

  Further, the stirring pin of the rotating tool has a flat surface perpendicular to the central axis of rotation at the tip, and the thickness of the first metal member is made larger than the thickness of the second metal member. It is preferable that the first metal member be placed on the lower surface across the step portion and the second metal member be placed on the higher surface across the step portion on the pedestal provided with the step portion.

  According to this bonding method, since the plasticized region can be increased in the height direction by the increase in the thickness of the first metal member, the bonding strength can be enhanced.

  Further, in the butting step, it is preferable to set so that the surface of the first metal member and the surface of the second metal member are flush with each other.

  According to such a joining method, the rotary tool can be easily inserted.

  Further, in the butting step, the surface of the first metal member is preferably set to be higher than the surface of the second metal member.

  According to the bonding method, it is possible to prevent the generation of the concave groove-like defect of the first metal member at a height position lower than the surface of the second metal member.

  Further, in the joining step, the joining of the rotating tool is performed such that the second metal member side is the shear side and the first metal member side is the flow side in the plasticizing region in which the movement trajectory of the rotating tool is formed. It is preferable to set the conditions.

If the second metal member having a high melting point in the plasticized region is on the flow side, the temperature of the first metal member at the butt joint is lowered, and the mutual diffusion at the interface between different metals is not promoted. May be However, according to such a joining method, by setting the second metal member having a high melting point to be a shear side, the temperature of the first metal member at the butting portion can be kept relatively high, which is different. Interdiffusion at the metal-metal interface is promoted, and bonding failure can be prevented.
The shear side is the side where the relative velocity of the outer periphery of the rotary tool with respect to the joint is a value obtained by adding the magnitude of the moving velocity to the magnitude of the tangential velocity at the outer periphery of the rotary tool. The flow side is the side where the relative velocity of the outer periphery of the rotary tool with respect to the joint is a value obtained by subtracting the magnitude of the movement velocity from the magnitude of the tangential velocity at the outer periphery of the rotary tool.

  When a counterclockwise spiral groove is formed on the outer peripheral surface of the rotary tool from the proximal end toward the tip, the rotary tool is rotated to the right, and the outer peripheral surface of the rotary tool is right as it goes from the base to the distal end Preferably, the rotary tool is turned to the left when the spiral groove is inscribed.

  According to this joining method, the plastically fluidized metal is guided to the spiral groove and flows to the tip side of the rotating tool, so that the generation of burrs can be suppressed.

  According to the bonding method and the method of manufacturing a composite rolled material according to the present invention, different types of metal members can be suitably bonded.

It is sectional drawing which shows the butt | matching process in the manufacturing method of the composite rolling material which concerns on 1st embodiment of this invention. It is a perspective view which shows the bonding process which concerns on 1st embodiment. It is sectional drawing which shows the joining process concerning 1st embodiment. It is sectional drawing which shows the joining process which concerns on 1st embodiment. It is a perspective view showing the rolling process concerning a first embodiment. It is sectional drawing which shows the butt | matching process in the manufacturing method of the composite rolling material which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the joining process concerning 2nd embodiment. It is sectional drawing which shows the joining process concerning 3rd embodiment. It is sectional drawing which shows the joining process which concerns on 3rd embodiment. It is a perspective view which shows the joining process concerning a modification. FIG. 11 is a cross-sectional view taken along line II of FIG.

First Embodiment
A method of manufacturing a composite rolled material according to an embodiment of the present invention will be described in detail with reference to the drawings. The manufacturing method of the composite rolling material which concerns on this embodiment rolls, after joining a pair of metal members with the rotation tool F, and obtains a composite rolling material. The "surface" in the following description means the surface opposite to the "back side".

  As shown in FIG. 1, the first metal member 1 has a plate shape. The first metal member 1 includes a front surface 1b, a back surface 1c, and an end surface 1a perpendicular to the front surface 1b and the back surface 1c. The first metal member 1 is formed of an aluminum alloy in the present embodiment, but may be formed of a friction stirtable metal material such as aluminum, copper, a copper alloy, titanium, a titanium alloy, magnesium, or a magnesium alloy.

  The second metal member 2 has a plate shape. The second metal member 2 includes a front surface 2b, a back surface 2c, and an end surface 2a perpendicular to the front surface 2b and the back surface 2c. The second metal member 2 has a melting point higher than that of the first metal member 1 and is formed of a material that can be frictionally stirred. The second metal member 2 is formed of copper (Cu 1020) in the present embodiment. In addition, as long as the shape of the 1st metal member 1 and the 2nd metal member 2 is provided with the end surface at least, another shape may be sufficient as it.

  By the way, since it is considered safe to assume that the softening temperature (K) of the metal member is approximately proportional to the melting point (K) of the metal member, in this specification, a metal member having a high softening temperature is a metal member having a high melting point As a metal member with a low softening temperature, it shall be handled as a metal member with a low melting point.

  The manufacturing method of the composite rolling material which concerns on this embodiment performs a preparatory process, a butt | matching process, a joining process, and a rolling process. The preparation step is a step of preparing the first metal member 1, the second metal member 2 and the rotating tool F. When the bonding method is performed, a preparation step, a butt step, and a bonding step are performed.

  The rotation tool F is comprised by the connection part F1 and the stirring pin F2, as shown in FIG.2 and FIG.3. The rotating tool F is formed of, for example, a tool steel. The connection part F1 is a part connected with the rotating shaft (illustration omitted) of a friction stirring apparatus. The connecting portion F1 has a cylindrical shape, and a screw hole (not shown) in which a bolt is fastened is formed.

  The stirring pin F2 is suspended from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 is tapered as it separates from the connecting portion F1. When viewed from the side, the taper angle α between the rotation center axis C and the outer peripheral surface of the stirring pin F2 is set to about 20 ° in the present embodiment. The taper angle α is appropriately set in the range of 10 to 30 °. If the taper angle α is less than 10 °, burrs may be discharged from the outer peripheral surface of the stirring pin F2 at the time of bonding, which may cause a bonding defect, which is not preferable. If the taper angle α exceeds 30 °, it becomes difficult to incline the rotary tool F. A flat surface F3 perpendicular to the central axis of rotation C is formed at the tip of the stirring pin F2.

  A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In the present embodiment, in order to rotate the rotation tool F to the right, the spiral groove is formed in the counterclockwise direction from the proximal end toward the distal end. In other words, the spiral groove is formed counterclockwise as viewed from above when the spiral is traced from the proximal end to the distal end.

  In addition, when rotating the rotation tool F to the left, it is preferable to form a spiral groove rightward as it goes to a tip from a base end. In other words, the spiral groove in this case is formed clockwise as viewed from above when the spiral groove is traced from the proximal end to the distal end. By setting the spiral groove in this manner, the plastically fluidized metal is guided to the tip side of the stirring pin F2 by the spiral groove during friction stirring. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (1st metal member 1, 2nd metal member 2) can be decreased. The rotary tool F is preferably attached to a robot arm provided at its tip with a rotary drive means such as a spindle unit. Thereby, the rotation center axis C of the rotating tool F can be easily inclined.

  The butting step is a step of butting the end portions of the first metal member 1 and the second metal member 2 as shown in FIG. In the butting step, the end surface 1a of the first metal member 1 and the end surface 2a of the second metal member 2 are surface-contacted to form a butt portion J1. Further, the front surface 1b of the first metal member 1 and the front surface 2b of the second metal member 2 are made flush, and the back surface 1c of the first metal member 1 and the back surface 2c of the second metal member 2 are made flush. . When the first metal member 1 and the second metal member 2 are butted, each member is restrained immovably by a clamp (not shown) provided on the mount. In the butting step, the vertical surface and the butting portion J1 are arranged in parallel.

  The bonding step is a step of bonding the first metal member 1 and the second metal member 2 using the rotary tool F. As shown in FIG. 2, in the bonding step, the stirring pin F2 of the rotary tool F is rotated to the start position Sp set on the surface 1 b of the first metal member 1 and near the butting portion J1 while rotating the stirring pin F2 right. Insert the tool F. Then, the rotation tool F is relatively moved in parallel with the extension direction of the butt portion J1. A plasticized region W is formed on the movement trajectory of the rotary tool F.

  In the bonding step, as shown in FIG. 3, friction stirring is performed in a state in which the rotation center axis C is inclined toward the first metal member 1 with respect to the abutment portion J1. In the present embodiment, since the taper angle α between the rotation center axis C and the outer peripheral surface of the stirring pin F2 is set to 20 °, in the bonding step, the rotation center axis C is a first metal member against the butting portion J1. Frictional stirring is performed in a state of being inclined at 20 ° to one side. Moreover, when performing friction stirring, only the stirring pin F2 which rotated to the to-be-joined metal member is inserted, and the to-be-joined metal member and the connection part F1 are made to move apart. In other words, friction stirring is performed in a state where the base end of the stirring pin F2 is exposed.

  In the bonding step, the second metal member 2 side (the side closer to the second metal member 2) in the plasticized region W is a shear side, and the first metal member 1 side (the side separated from the second metal member 2) is The bonding conditions of the rotary tool F are set to be on the flow side. That is, in the bonding step according to the present embodiment, the first metal member 1 is disposed on the right side in the traveling direction, and the rotation tool F is rotated to the right. In addition, when arrange | positioning so that the 2nd metal member 2 may be located in the advancing direction right side, the 1st metal member 1 side becomes the flow side among plasticization area | region W by rotating the rotation tool F left-handed.

  As shown in FIG. 3, the insertion depth of the stirring pin F2 may be set appropriately, but in the present embodiment, the depth to which the flat surface F3 reaches about 90% of the thickness of the first metal member 1 is set. ing. Further, in the bonding step of the present embodiment, the rotation tool F does not contact the second metal member 2, and the start position Sp is such that the first metal member 1 and the second metal member 2 are diffusion bonded by friction stirring. The position of is set.

  Here, when the outer peripheral surface of the rotary tool F and the second metal member 2 are largely separated, the first metal member 1 and the second metal member 2 do not mutually diffuse at the butt portion J1, and the first metal member 1 and the second metal member 1 The second metal member 2 can not be joined firmly. On the other hand, when the rotary tool F is brought into contact with the second metal member 2 and friction stirring is performed in a state in which the overlap margin between the two is increased, the welding conditions are adjusted to soften the second metal member 2. Needs to be large, and there is a defect in bonding. Therefore, the outer peripheral surface of the rotary tool F and the second metal member 2 are slightly in contact with each other so that the first metal member 1 and the second metal member 2 mutually diffuse and join at the butt portion J1. It is preferable to join or to join in the state which closely approached without making the outer peripheral surface of rotation tool F, and the 2nd metal member 2 contact, as much as possible.

  In addition, as in the present embodiment, when the first metal member 1 is an aluminum alloy member and the second metal member 2 is a copper member, the outer peripheral surface of the rotary tool F and the second metal member 2 in the bonding step It is preferable to join in the state brought close as much as possible without contacting (copper member). Incidentally, if the outer peripheral surface of the rotary tool F is brought into contact with the second metal member 2 (copper member) under joining conditions where the amount of heat input becomes large, a small amount of copper member is stirred into the aluminum alloy member, The interdiffusion of Al / Cu is promoted, the Al-Cu phase dispersed in the aluminum alloy member becomes a liquid phase, and a large amount of burrs are generated from the aluminum alloy member side, resulting in a bonding failure.

  As shown in FIG. 4, a burr V is formed on the upper surface of the plasticized region W, and a recessed groove Q is formed along the abutting portion J1. The plasticized area W and the second metal member 2 are adjacent to each other. That is, the plasticized area W is not formed on the second metal member 2 side beyond the butt portion J1. The recessed groove Q is a groove formed along the abutting portion J1 by the metal overflowing to the outside by friction stirring. After the bonding process is completed, it is preferable to perform a burr removal process for removing the burrs V.

  The rolling step is a step of rolling the joined first metal member 1 and second metal member 2. As shown in FIG. 5, in the rolling process, cold rolling is performed using a rolling mill equipped with rollers R and R. In the rolling step, the bonding line (plasticizing region W) in the bonding step is set in the rolling direction and rolled. Composite rolling material 10 is formed of the above. The rolling reduction in the rolling process may be appropriately set according to the materials of the first metal member 1 and the second metal member 2 and the use of the composite rolled material 10.

  According to the manufacturing method and joining method of the composite rolling material described above, since it is not necessary to form the end faces of the metal members diagonally as in the prior art, the manufacturing cost can be reduced. Further, by inclining the rotation center axis C of the rotating tool F toward the first metal member 1, it is possible to avoid the contact between the rotating tool F and the second metal member 2, and the material in the bonding step. It is possible to easily prevent the mixture of the first metal member 1 and the second metal member 2 different from each other.

  Further, the inclination angle of the rotation center axis C of the rotary tool F in the bonding step may be set appropriately, but in the present embodiment, the taper angle α of the outer peripheral surface of the stirring pin F2 and the rotation center axis C with respect to the butt joint portion J1 The inclination angle is the same. Thereby, as shown in FIG. 3, since the outer peripheral surface of the agitating pin F2 and the butting portion J1 are parallel to each other, the outer peripheral surface of the rotary tool F and the second metal member 2 are not in contact with each other. Work becomes easy.

  Further, since the shoulder portion of the rotary tool is not brought into contact with the first metal member 1 and the second metal member 2, the amount of heat input to the first metal member 1 and the second metal member 2 can be suppressed. Further, for example, if the rotary tool F is inserted so as to contact only the first metal member 1, the bonding conditions can be adjusted according to the first metal member 1 having a low softening temperature, and the heat input can be suppressed. it can. Therefore, it can suppress that the 1st metal member 1 softens largely, and it can suppress that the burr | flash V generate | occur | produces excessively, and can prevent the joining defect by metal lack.

  Further, since the shoulder portion of the rotary tool F is not in contact with the first metal member 1 and the second metal member 2, the frictional resistance can be reduced, and the load applied to the rotary tool F or the friction stirring device can be reduced. . Furthermore, since the shoulder portion of the rotary tool F is not in contact with the first metal member 1 and the second metal member 2, it is possible to prevent the rotary tool F from becoming hot. Thereby, the material selection of the rotating tool F is facilitated, and the life of the rotating tool F can be extended.

  Further, as in the present embodiment, when the first metal member 1 is an aluminum alloy member and the second metal member 2 is a copper member, the outer peripheral surface of the rotary tool F and the second metal member 2 ( It is preferable to join in a state where it does not contact with the copper member) and as close as possible. In this way, the mutual diffusion of the first metal member 1 and the second metal member 2 is promoted and firmly joined at the butt portion J1 without excessive generation of the burrs V from the aluminum alloy member side.

  When the second metal member 2 having a high melting point in the plasticized region W is on the flow side, the temperature of the first metal member 1 at the butt joint portion J1 is reduced, and mutual diffusion at the interface between different metals is not promoted. There is a risk of poor bonding. Therefore, if the bonding conditions are adjusted to increase the heat input, burrs are generated excessively from the side of the first metal member 1 on the shear side, resulting in bonding defects. However, as in the present embodiment, the temperature of the first metal member 1 at the butted portion J1 is compared by setting the second metal member 2 side having the high melting point in the plasticized region W to be the shear side. It is possible to keep the temperature as high as possible, to promote interdiffusion at the interface between different metals, and to prevent a junction failure.

  The outer peripheral surface of the rotary tool F may be slightly in contact with the second metal member 2, but in the present embodiment, the first metal is set so as not to contact the rotary tool F with the second metal member 2. It can prevent that the member 1 and the 2nd metal member 2 are mixed and stirred, and it can prevent more reliably that the burr | flash V generate | occur | produces excessively and becomes a joining defect.

Second Embodiment
Next, a second embodiment of a method of manufacturing a composite rolled material and a method of bonding according to the present invention will be described. The method of manufacturing a composite rolled material according to the second embodiment is different from the first embodiment in that the plate thicknesses of the metal members are different. In the method of manufacturing a composite rolled material according to the second embodiment, a preparation step, a butt step, a joining step, and a rolling step are performed.

  As shown in FIG. 6, the thickness of the first metal member 1 </ b> X is larger than that of the second metal member 2. The rack K is a member that restrains the first metal member 1X and the second metal member 2 so as not to move. The gantry K includes a first surface K1 on which the first metal member 1X is mounted, and a second surface K2 which is higher than the first surface K1 and on which the second metal member 2 is mounted. A stepped portion is formed by the first surface K1 and the second surface K2.

  In the butting step, the end surface 1a of the first metal member 1X and the end surface 2a of the second metal member 2 are surfaces while the back surface 1c and the end surface 1a of the first metal member 1X are in contact with the first surface K1 and the step surface K3. Make contact. The surface 1b of the first metal member 1X and the surface 2b of the second metal member 2 are flush with each other.

  In the bonding step, as shown in FIG. 7, friction stirring is performed in substantially the same manner as in the first embodiment. In the present embodiment, the insertion depth of the rotary tool F is set so that the flat surface F3 is at substantially the same height position as the back surface 2c of the second metal member 2.

Here, as shown in FIG. 3, the tip of the rotating tool F is provided with a flat surface F3 in order to be broken or broken due to material resistance. However, in the bonding process of the first embodiment, since there is the flat surface F3, it becomes difficult to perform friction stirring over the entire length of the butt portion J1, and an unbonded portion is generated.
On the other hand, in the method of manufacturing a composite rolled material according to the second embodiment, as shown in FIG. 7, the first metal member 1X side is made thicker than the second metal member 2, and the flat surface F3 is made in the bonding step. It inserts to the height position of the back surface 2c of the 2nd metal member 2. As shown in FIG. Thereby, since the whole of the height direction of the butt portion J1 can be frictionally stirred, the bonding strength can be enhanced. Therefore, the crack etc. which originate in the unjoined part can be prevented. Further, since the surface 1b of the first metal member 1X and the surface 2b of the second metal member 2 are flush with each other, the rotary tool F can be easily inserted.

Third Embodiment
Next, a third embodiment of the method of manufacturing a composite rolled material and the method of bonding according to the present invention will be described. The method of manufacturing a composite rolled material according to the third embodiment is different from the first embodiment in that the plate thicknesses of the metal members are different. In the method of manufacturing a composite rolled material, a preparation step, a butt step, a joining step, and a rolling step are performed.

  As shown in FIG. 8, in the method of manufacturing a composite rolled material according to the third embodiment, the thickness of the first metal member 1Y is made larger than that of the second embodiment. That is, in the butt joint process of the third embodiment, the first metal member 1Y and the second metal member 2 are placed on the gantry K in the same manner as the butt joint process of the second embodiment. Further, the end face 1a of the first metal member 1Y and the end face 2a of the second metal member 2 are butted to form a butt portion J1. At that time, the thickness of the first metal member 1Y is set such that the surface 1b of the first metal member 1Y is at a higher position than the surface 2b of the second metal member 2. The said plate | board thickness is suitably set according to the magnitude | size etc. of the ditch | groove generated in a joining process.

  In the bonding step, friction stirring is performed in the same manner as in the second embodiment. That is, as shown in FIG. 8, the insertion depth of the rotary tool F is set so that the flat surface F3 of the rotary tool F is at substantially the same height position as the back surface 2c of the second metal member 2 to perform friction stirring. Do.

  Here, for example, in the first embodiment shown in FIG. 4, the concave groove Q tends to be generated on the surface 1 b of the first metal member 1. However, according to the third embodiment shown in FIG. 9, since the height position of the surface 1b of the first metal member 1Y is higher than the surface 2b of the second metal member 2, the recessed groove Q is formed. Even if it does, it can prevent that the ditch | groove Q is formed below the position of the surface 2b of the 2nd metal member 2. As shown in FIG. For example, when the surface 1b of the first metal member 1Y is aligned with the height position of the surface 2b of the second metal member 2, a flat surface can be formed. Further, according to the third embodiment, as in the second embodiment, since the entire height direction of the butt joint portion J1 can be frictionally stirred, the bonding strength can be enhanced. Therefore, the crack etc. which originate in the unjoined part can be prevented.

[Modification]
Next, a modification of the present invention will be described. FIG. 10 is a perspective view showing a bonding process according to a modification. As shown in FIG. 10, in the butt process according to the modification, a plurality of sets (three sets in FIG. 10) consisting of the first metal member 1 and the second metal member 2 are provided side by side and clamps provided on a gantry Restrain the movement impossible (not shown).

  In this modification, a first set of the first metal member 1A and the second metal member 2A, a second set of the first metal member 1B and the second metal member 2B, a first metal member 1C, and a A third set of two metal members 2C is juxtaposed. The first set, the second set, and the third set of butting portions J1 are butted in parallel with each other.

  Further, the end face of the first metal member 1A and the end face of the second metal member 2B are butted to form a butt portion J2. Further, the first metal member 1B and the second metal member 2C are butted to form a butt portion J3.

  In the bonding step, friction stirring is performed using the rotary tool F in the same manner as in the above-described embodiment, and the respective abutting portions J1 are bonded. Further, in the bonding step, friction stirring is performed on the butt joint portion J2 and the butt joint portion J3 using the rotary tool F in the same manner as the embodiment described above.

  That is, in the bonding step according to the modification, the rotating tool F rotating right is inserted into the surface 1b of the first metal member 1A in the vicinity of the abutting portion J2, and the rotating tool F is inserted along the abutting portion J1. The metal member 1A is moved from the back side to the front side. At this time, the rotary tool F is inclined toward the first metal member 1A while setting the first metal member 1A to be positioned on the right side in the traveling direction.

  That is, in the butted portion J2, the bonding conditions (rotational direction, movement direction, etc.) of the rotary tool F are set such that the second metal member 2B side in the plasticized region W is on the shear side. Also in the butt portion J3, friction stirring is performed in the same manner as in the butt portion J2. As shown in FIGS. 10 and 11, in the present modification, the plasticized region W is not formed in the second metal member 2 (2A, 2B, 2C), and the first metal member 1 (1A, 1B, 1C) The plasticized region W is formed only in

  Since the first metal member 1 and the second metal member 2 are formed of different materials, their hardness is also different. When rolling the first metal member 1 formed of aluminum alloy and the second metal member 2 formed of copper as in this embodiment, the hardness of the aluminum alloy member is lower than that of the copper member, The first metal member 1 is largely deformed. Therefore, the composite rolled material obtained after rolling is curved in an arc shape in plan view such that the first metal member 1 is on the outside and the second metal member 2 is on the inside.

  However, according to the bonding process according to the modification, since the sets of the adjacent metal members are movably restrained in a state where they are juxtaposed, it is possible to suppress that each metal member is deformed into an arch shape in plan view can do. In addition, since the friction stir can be continuously performed on the plurality of butting portions J1, J2, and J3 in one clamping operation, the manufacturing cycle can be enhanced.

DESCRIPTION OF SYMBOLS 1 1st metal member 2 2nd metal member 10 composite rolling material F rotation tool F1 connection part F2 stirring pin F3 flat surface W plasticization area | region

Claims (9)

A joining method of joining a pair of metal members of different materials using a rotary tool provided with a tapered stirring pin, comprising:
A first metal member with an end face,
Preparing a second metal member having an end face and having a melting point higher than that of the first metal member;
Butting step in which the end faces of the first metal member and the second metal member are butted to form a butt portion;
Only the stirring pin is inserted while inserting the stirring pin of the rotating tool to be rotated from only the surface of the first metal member and inclining the rotation center axis of the rotating tool toward the first metal member with respect to the abutment portion. Joining the first metal member and the second metal member by relatively moving the rotary tool along the abutment portion in a state where at least the first metal member is in contact with the first metal member. Characteristic bonding method. When the taper angle between the rotation center axis and the outer peripheral surface of the stirring pin is an angle α:
2. The bonding method according to claim 1, wherein in the bonding step, the rotation central axis is inclined at an angle α to the first metal member side with respect to the butt joint portion. The first metal member is formed of aluminum or an aluminum alloy, and the second metal member is formed of copper or a copper alloy.
In the bonding step, the stirring pin of the rotating tool to be rotated is inserted only from the surface of the first metal member, and the central axis of rotation of the rotating tool is inclined toward the first metal member while only the stirring pin is The bonding method according to claim 1 or 2, wherein the rotating tool is relatively moved along the butting portion in a state of being in contact with only the first metal member. The stirring pin of the rotating tool has at its tip a flat surface perpendicular to the central axis of rotation,
Making the thickness of the first metal member larger than the thickness of the second metal member,
In the butting step, the first metal member is placed on the lower surface across the stepped portion, and the second metal member is placed on the higher surface across the stepped portion on the gantry having the stepped portion. The bonding method according to any one of claims 1 to 3, wherein:   The bonding method according to claim 4, wherein in the butting step, a surface of the first metal member and a surface of the second metal member are set to be flush with each other.   The bonding method according to claim 4, wherein in the butting step, the surface of the first metal member is set to be higher than the surface of the second metal member.   In the joining step, the joining condition of the rotating tool is set so that the second metal member side is the shear side and the first metal member side is the flow side in the plasticizing region in which the movement trajectory of the rotating tool is formed. The bonding method according to any one of claims 1 to 6, wherein setting is performed. When a counterclockwise spiral groove is formed on the outer peripheral surface of the rotary tool from the proximal end toward the distal end, the rotary tool is rotated to the right,
8. The rotary tool according to any one of claims 1 to 7, wherein when the outer circumferential surface of the rotary tool is engraved with a clockwise spiral groove from the proximal end toward the distal end, the rotary tool is rotated to the left. Bonding method described. A method of manufacturing a composite rolled material formed of a pair of metal members different in material, comprising:
A first metal member with an end face,
Preparing a second metal member having an end surface and having a melting point higher than that of the first metal member, and a rotary tool having a tapered stirring pin;
Butting step in which the end faces of the first metal member and the second metal member are butted to form a butt portion;
Only the stirring pin is inserted while inserting the stirring pin of the rotating tool to be rotated from only the surface of the first metal member and inclining the rotation center axis of the rotating tool toward the first metal member with respect to the abutment portion. Bonding the first metal member and the second metal member by relatively moving the rotary tool along the butting portion in a state where at least the first metal member is in contact with the first metal member;
And a rolling step of rolling the metal members joined in the joining step with a joining line as a rolling direction.

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