JP2018020363A - Joint method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint method capable of enhancing joint accuracy.SOLUTION: A joint method includes: an overlapping step of overlapping a surface 1a of a first metal member 1 and a rear face 2b of a second metal member 2 to form an overlapping portion J1; a first friction stirring step of inserting a rotating rotary tool F for joint from a surface 2a of the second metal member 2, relatively moving the rotary tool F for joint along the overlapping portion J1 in a state in which only a stirring pin F2 is brought into contact only with the second metal member 2 or in a state in which only the stirring pin F2 is brought into contact with both the first metal member 1 and the second metal member 2, and performing friction stirring joint; and a welding step of welding the overlapping portion J1 from at least one of a rear face 1b of the first metal member 1 and a surface 2a of the second metal member 2 along a plasticized region W1 formed by the first friction stirring step by MIG welding, TIG welding or laser welding.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a joining method for joining metal members together by friction stirring.

  For example, in Patent Document 1, after superposing a surface of a first metal member and a back surface of a second metal member to form a superposed portion, welding (arc welding, from the surface of the second metal member to the superposed portion is performed. Technology for performing laser welding or the like is disclosed.

JP 2007-253210 A

  In the conventional joining method, the first metal member and the second metal member are deformed by heat input during welding, and a gap is generated between the first metal member and the second metal member, thereby lowering the joining accuracy. There is a fear. In particular, when the thickness of the first metal member and the second metal member is thin, the first metal member and the second metal member are greatly deformed, so that the joining accuracy may be further reduced.

  Then, this invention makes it a subject to provide the joining method which can improve a joining precision.

  In order to solve the above-mentioned problem, the present invention provides a joining method for joining a first metal member and a second metal member using a rotary tool having a stirring pin, the surface of the first metal member and the surface of the first metal member An overlapping step of overlapping the back surface of the second metal member to form a superposition part, and the rotating tool rotating from the surface of the second metal member are inserted, and only the stirring pin is only in the second metal member A first friction stirring step of performing friction stir welding by relatively moving the rotary tool along the overlapping portion in a contact state or in a state of contact with both the first metal member and the second metal member; The superposed part is formed by performing MIG welding, TIG welding or laser welding from at least one of the back surface of the first metal member and the surface of the second metal member along the plasticized region formed by the first friction stirring step. A welding step of welding, characterized in that it comprises a.

  According to this joining method, since the first metal member and the second metal member are temporarily fixed by performing the first friction stirring process, the first metal member and the second metal member are separated from each other during the welding process. Can be prevented. Thereby, joining accuracy can be raised.

  Moreover, it is preferable to include the 1st removal process of removing the 1st surplus piece part in which the burr | flash was formed among said 2nd metal members on the boundary of the plasticization area | region formed at said 1st friction stirring process. According to such a joining method, burrs can be easily removed.

  In the first removal step, it is preferable that the first surplus piece is removed with a concave groove formed in the plasticized region as a boundary. According to this joining method, burrs can be removed more easily.

  In the first friction stirring step, it is preferable to set the joining conditions so that burrs generated in the friction stir welding are formed in the first surplus piece. According to such a joining method, the burrs can be concentrated on the surplus pieces, so that the burrs can be more easily removed.

  Moreover, this invention is a joining method which joins a 1st metal member and a 2nd metal member using the rotary tool provided with the stirring pin, Comprising: The surface of the said 1st metal member, and the back surface of the said 2nd metal member And a superposition step of superposing and forming a superposition part, the rotating tool rotating from the surface of the second metal member is inserted, and only the stirring pin is in contact with the second metal member, or A first friction stirring step of performing friction stir welding by relatively moving the rotary tool along the overlapping portion in a state of being in contact with both the first metal member and the second metal member; and the first metal member The rotating tool that rotates from the back surface of the first metal member is inserted, and only the stirring pin is in contact with only the first metal member, or in a state in which both the first metal member and the second metal member are in contact with each other. Along the superposition part A second friction stir step of performing friction stir welding rolling tool are relatively moved, characterized in that it comprises a.

  According to this joining method, since joining is performed with friction stirrer having a lower heat input temperature than welding, deformation of the first metal member and the second metal member is suppressed. Moreover, since the first metal member and the second metal member are temporarily fixed by performing the first friction stirring step, the first metal member and the second metal member are separated during the second friction stirring step. Can be prevented. Thereby, joining accuracy can be raised.

  Further, between the plasticized region formed in the first friction stirring step and the plasticized region formed in the second friction stirring step, the back surface of the first metal member and the surface of the second metal member It is preferable to include a welding step of welding the overlapped portion by performing MIG welding, TIG welding or laser welding from at least one.

  According to such a joining method, the first metal member and the second metal member are temporarily fixed by performing the first friction stirring step and the second friction stirring step. It is possible to prevent the two metal members from separating. Thereby, joining accuracy can be raised.

  According to the joining method according to the present invention, the joining accuracy can be increased.

It is a perspective view which shows the superimposition process of the joining method which concerns on 1st embodiment of this invention. It is a perspective view which shows the 1st friction stirring process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the 1st friction stirring process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the welding process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows the 1st removal process of the joining method which concerns on 1st embodiment. It is sectional drawing which shows after the 1st friction stirring process of the joining method which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the 1st removal process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the 2nd friction stirring process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the 2nd removal process of the joining method which concerns on 2nd embodiment. It is sectional drawing which shows the welding process of the joining method which concerns on 2nd embodiment.

[First embodiment]
Embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in the joining method according to the present embodiment, the first metal member 1 and the second metal member 2 are overlapped and joined. In the joining method according to the present embodiment, an overlaying process, a first friction stirring process, a welding process, and a first removal process are performed. In the following description, “front surface” means a surface opposite to the “back surface”.

  The superimposing step is a step of superposing the first metal member 1 and the second metal member 2 as shown in FIG. The first metal member 1 and the second metal member 2 are metal plate-like members. The material of the first metal member 1 and the second metal member 2 is not particularly limited as long as it is a metal capable of friction stir. For example, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy, etc. May be selected as appropriate. The plate | board thickness of the 1st metal member 1 and the 2nd metal member 2 is equivalent. The plate thicknesses of the first metal member 1 and the second metal member 2 may be set as appropriate. A slit 5 is formed at the end of the second metal member 2 in parallel with the end surface 2 c of the second metal member 2. The slits 5 may be provided at both end portions of the second metal member 2.

  In the overlapping step, a part of the front surface 1a of the first metal member 1 and a part of the back surface 2b of the second metal member 2 are overlapped to form the overlapping portion J1. In the overlapping step, the end surface 1c on the left side of the first metal member 1 (left side with respect to the traveling direction of the joining rotary tool F (see FIG. 2)) is positioned below the back surface 2b of the second metal member 2, The right end surface 2 c of the second metal member 2 is positioned on the surface 1 a of the first metal member 1. The superposed first metal member 1 and second metal member 2 are fixed to a gantry (not shown) with a jig.

  As shown in FIG. 2, the first friction stirring step is a step of friction stir welding the overlapping portion J <b> 1 using the rotating tool F for bonding. The joining rotary tool F includes a connecting portion F1 and a stirring pin F2. The joining rotary tool F corresponds to a “rotary tool” in the claims. The joining rotary tool F is made of, for example, tool steel. The connecting part F1 is a part connected to a rotating shaft (not shown) of the friction stirrer. The connecting portion F1 has a cylindrical shape.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 has a tapered truncated cone shape as it is separated from the connecting portion F1. A spiral groove is formed on the outer peripheral surface of the stirring pin F2. In the present embodiment, the spiral groove is formed in a counterclockwise direction from the proximal end toward the distal end in order to rotate the joining rotary tool F to the right.

  In addition, when rotating the rotation tool F for joining counterclockwise, it is preferable to form a spiral groove clockwise as it goes to a front-end | tip from a base end. By setting the spiral groove in this way, the metal plastically fluidized during friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the quantity of the metal which overflows to the exterior of a to-be-joined metal member (the 1st metal member 1 and the 2nd metal member 2) can be decreased. The spiral groove may be omitted.

  In the first friction stirring step, the rotating tool F for rotation rotated to the right is inserted into the start position Sp set on the surface 2a of the second metal member 2, and the rotating tool F for bonding is relatively moved along the overlapping portion J1. . In the first friction stirring step, the friction stirring is performed so that the connecting portion F1 does not come into contact with the metal member to be joined, that is, the base end side of the stirring pin F2 is exposed. The traveling direction of the joining rotary tool F is set so that the end surface 2c of the second metal member 2 is positioned on the right side of the joining rotary tool F. A plasticized region W1 is formed in the movement locus of the welding rotary tool F. In the first friction stirring step, it is preferable to set the start position Sp so that the plasticized region W1 and the slit 5 overlap.

  As shown in FIG. 3, the insertion depth of the stirring pin F2 of the joining rotary tool F may be set as appropriate, but in this embodiment, only the stirring pin F2 is both the first metal member 1 and the second metal member 2. Is set to touch. The insertion depth of the stirring pin F2 of the welding rotary tool F may be set so that only the stirring pin F2 contacts only the second metal member 2. In this case, the overlapping portion J1 is plastically fluidized by frictional heat between the stirring pin F2 and the second metal member 2.

  As shown in FIGS. 3 and 4, in this embodiment, the shear side (advancing side: the side on which the moving speed of the rotating tool is added to the tangential speed on the outer periphery of the rotating tool) is the bonding center. The movement direction and the rotation direction of the welding rotary tool F are set so as to be opposite to the end face 2c of the second metal member 2 with respect to the line X. The rotation direction and the traveling direction of the joining rotary tool F are not limited to those described above, and may be set as appropriate.

  For example, when the rotational speed of the welding rotary tool F is low, the shear side is more plastic flow than the flow side (retreating side: the side where the moving speed of the rotary tool is subtracted from the tangential speed on the outer periphery of the rotary tool). Since the temperature of the material is likely to rise, a large number of burrs V are generated on the shear side outside the plasticized region W1, and a concave groove tends to be formed on the shear side in the plasticized region W1. The concave groove is a portion that is particularly deeply drilled during friction stir welding, and is formed along the plasticized region W1. On the other hand, for example, when the rotational speed of the rotating tool F for joining is high, the temperature of the plastic fluidized material increases on the shear side, but there are more burrs V on the flow side outside the plasticizing region W1 due to the higher rotational speed. It is generated and tends to form a ditch on the flow side in the plasticized region W1.

  In the present embodiment, since the rotation speed of the joining rotary tool F is set high, as shown in FIG. 4, many burrs V are generated on the flow side outside the plasticization region W1, and the rotation within the plasticization region W1. A concave groove D tends to be formed on the flow side. Moreover, the moving speed (feeding speed) of the joining rotary tool F can be increased by setting the rotational speed of the joining rotary tool F faster. Thereby, a joining cycle can be shortened.

  In the first friction stirring step, on which side of the traveling direction of the welding rotary tool F the burr V is generated depends on the joining conditions. The joining conditions include the rotational speed, rotational direction, moving speed (feed speed) of the rotating tool F for joining, the inclination angle (taper angle) of the stirring pin F2, and the metal members to be joined (first metal member 1 and second metal). It is determined by each element such as the material of the member 2), the thickness of the metal member to be joined, and the combination of these elements. If the side where the burr V is generated or the side where the burr V is generated is set to be the first surplus piece 10 side described later according to the joining condition, the first removal step can be easily performed. preferable.

  As shown in FIG. 4, the welding process is a process of welding the overlapping portion J1 from the surface 2a of the second metal member 2 along the plasticized region W1 formed by the first friction stirring process. In the welding process, the type of welding is not particularly limited, but for example, MIG welding, TIG welding, or laser welding is performed. In the welding process according to the present embodiment, the welding torch H is brought close to the surface 2a of the second metal member 2 to weld the overlap portion J1. A welding mark R is formed on the movement trajectory of the welding torch H. The welding process may be performed from at least one of the back surface 1b of the first metal member 1 and the surface 2a of the second metal member 2.

  As shown in FIG. 5, the first removal step is a step of removing the first surplus piece portion 10 in which the burr V is formed from the second metal member 2. The 1st surplus piece part 10 is a site | part removed from the 2nd metal member 2 on the boundary of the plasticization area | region W1 after joining. In the first removal step, in the present embodiment, the first surplus piece portion 10 is cut and bent in a direction away from the first metal member 1 with the groove D as a boundary. In the first removal step, when the first surplus piece 10 is bent starting from the slit 5 shown in FIG. 2, it can be easily removed.

  As described above, according to the joining method according to this embodiment, the first metal member 1 and the second metal member 2 are temporarily fixed by performing the first friction stirring step. The one metal member 1 and the second metal member 2 can be prevented from separating. Thereby, joining accuracy can be raised. Further, in the first friction stirring step, the joining conditions are set so that the concave groove D is formed on the flow side in the plasticizing region W1 (on the end surface 2c side with respect to the joining center line X). Of these, the vicinity of the bonding center line X and the shear side can be firmly bonded with little metal shortage.

Further, since the first surplus piece portion 10 in which the burr V is formed in the second metal member 2 is removed from the plasticized region W1 formed in the first friction stirring step, the burr V is easily removed. can do. Moreover, the 1st surplus piece part 10 can be removed more easily by removing the 1st surplus piece part 10 on the boundary of the ditch | groove D formed in the plasticization area | region W1.

  Further, in the first friction stirring step, the burr V is formed in the first surplus piece portion 10 by setting the joining conditions so that the burr V generated in the friction stir welding is formed in the first surplus piece portion 10. Can be aggregated. Thereby, the burr | flash V can be removed more easily.

[Second Embodiment]
Next, the joining method according to the second embodiment of the present invention will be described. In the joining method according to the second embodiment, an overlapping process, a first friction stirring process, a first removing process, a second friction stirring process, a second removing process, and a welding process are performed. The overlapping process and the first friction stirring process are the same as those in the first embodiment.

  As shown in FIGS. 6 and 7, in the first removal step, the first surplus piece 10 is removed with the groove D as a boundary in the same manner as in the first embodiment. If the 1st surplus piece part 10 is removed, the front and back of the 1st metal member 1 and the 2nd metal member 2 will be turned over, and it will again fix to a mount frame (illustration omitted) with a jig | tool.

  As shown in FIG. 8, the second friction stirring step is a step of inserting the joining rotary tool F from the back surface 1 b side of the first metal member 1 and friction stir welding the overlapping portion J1. In the second friction stirring step, the rotation direction and the traveling direction of the bonding rotary tool F are set so that the end surface 1c side of the first metal member 1 is the flow side. That is, in the second friction agitation step of the present embodiment, the welding rotary tool F is relatively moved from the near side to the far side in FIG. A plasticized region W2 is formed on the movement locus of the welding rotary tool F.

  As shown in FIG. 9, a concave groove D is formed on the flow side in the plasticized region W2 with respect to the joining center line X by the second friction stirring step. Further, burrs V are formed on the flow side outside the plasticized region W2.

  As shown in FIG. 9, the second removal step is a step of removing the second surplus piece portion 20 in which the burr V is formed from the first metal member 1. The second surplus piece portion 20 is a portion of the first metal member 1 that is removed after joining at the plasticized region W2. In the second removal step, in the present embodiment, the second surplus piece portion 20 is cut and bent in a direction away from the second metal member 2 with the concave groove D as a boundary. As in the first embodiment, a slit (not shown) is provided in advance at the end of the first metal member 1, and in the second removal step, the second surplus piece 20 is formed starting from the slit. When folded, it can be easily excised.

  As shown in FIG. 10, the welding process is performed between the plasticized region W1 formed in the first friction stirring step and the plasticized region W2 formed in the second friction stirring step. In this process, welding is performed from the back surface 1b to weld the overlapping portion J1. In the welding process, the type of welding is not particularly limited, but for example, MIG welding, TIG welding, or laser welding is performed. In the welding process according to the present embodiment, the welding torch H is brought close to the back surface 1b of the first metal member 1 to weld the overlap portion J1. A welding mark R is formed on the movement trajectory of the welding torch H. The welding process may be performed from at least one of the back surface 1b of the first metal member 1 and the surface 2a of the second metal member 2.

  Even with the bonding method according to the second embodiment described above, the same effects as those of the first embodiment can be obtained. In particular, according to the second embodiment, the first metal member 1 and the second metal member 2 are firmly temporarily fixed by performing the first friction stirring step and the second friction stirring step. In addition, the first metal member 1 and the second metal member 2 can be more reliably prevented from separating. Thereby, joining accuracy can be raised.

  Although the embodiments of the present invention have been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the second embodiment, the welding process may be omitted. That is, in the modified example of the present invention, the superposition process, the first friction stirring process, the first removal process, the second friction stirring process, and the second removal process are performed. Each process is common to the second embodiment. According to the modified example, the first metal member 1 and the second metal member 2 are prevented from being deformed because they are joined by friction stir that has a lower heat input temperature than welding. Thereby, since it can prevent separating the 1st metal member 1 and the 2nd metal member 2 during joining, joining accuracy can be raised.

DESCRIPTION OF SYMBOLS 1 1st metal member 1a Surface 1b Back surface 2 2nd metal member 2a Surface 2b Back surface 10 1st surplus piece part 20 2nd surplus piece part F Rotating tool for rotation (rotary tool)
F1 connecting part F2 stirring pin J1 overlapping part D concave groove V burr W1 plasticizing region

Claims (12)

A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A superposition step of superposing the front surface of the first metal member and the back surface of the second metal member to form a superposed portion;
Inserting the rotating tool that rotates from the surface of the second metal member and contacting only the stirring pin with only the second metal member, or contacting both the first metal member and the second metal member A first friction stirring step of performing friction stir welding by relatively moving the rotary tool along the overlapping portion in the state of being,
Performing MIG welding, TIG welding or laser welding from at least one of the back surface of the first metal member and the surface of the second metal member along the plasticized region formed by the first friction stirring step, And a welding process for welding.   The method further comprises a first removal step of removing the first surplus piece portion formed with burrs in the second metal member, with the plasticized region formed in the first friction stirring step as a boundary. Item 2. The joining method according to Item 1.   3. The joining method according to claim 2, wherein, in the first removing step, the first surplus piece portion is removed with a concave groove formed in the plasticized region as a boundary.   The joining condition is set in the first friction stirring step so that burrs generated in the friction stir welding are formed in the first surplus piece part. Joining method. A joining method for joining the first metal member and the second metal member using a rotary tool equipped with a stirring pin,
A superposition step of superposing the front surface of the first metal member and the back surface of the second metal member to form a superposed portion;
Inserting the rotating tool that rotates from the surface of the second metal member and contacting only the stirring pin with only the second metal member, or contacting both the first metal member and the second metal member A first friction stirring step of performing friction stir welding by relatively moving the rotary tool along the overlapping portion in the state of being,
Insert the rotating tool that rotates from the back surface of the first metal member, and contact only the stirring pin with only the first metal member, or contact both the first metal member and the second metal member And a second friction stirring step of performing friction stir welding by relatively moving the rotary tool along the overlapping portion in a state of being put.   At least one of the back surface of the first metal member and the surface of the second metal member between the plasticized region formed in the first friction stirring step and the plasticizing region formed in the second friction stirring step. The joining method according to claim 5, further comprising a welding step of welding the overlapped portion by performing MIG welding, TIG welding, or laser welding.   The method further comprises a first removal step of removing the first surplus piece portion formed with burrs in the second metal member, with the plasticized region formed in the first friction stirring step as a boundary. Claim | item 5 or the joining method of Claim 6.   The joining method according to claim 7, wherein, in the first removing step, the first surplus piece portion is removed with a concave groove formed in the plasticized region as a boundary.   9. The welding condition according to claim 7, wherein in the first friction stirring step, the joining condition is set so that burrs generated in the friction stir welding are formed in the first surplus piece portion. Joining method.   The method further comprises a second removal step of removing the second surplus piece portion in which the burr is formed in the first metal member, with the plasticized region formed in the second friction stirring step as a boundary. The joining method according to any one of claims 5 to 8.   11. The joining method according to claim 10, wherein, in the second removing step, the second surplus piece portion is removed with a concave groove formed in the plasticized region as a boundary.   The joining condition is set in the second friction stirring step so that burrs generated in the friction stir welding are formed in the second surplus piece part. Joining method.

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