JP2017217686A - Joining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method capable of easily removing a burr.SOLUTION: A joining method includes a preparation process of preparing a wall member 10 having a through-hole 11 and a cylindrical member 20 having a flange part 22 on one end side, an arrangement process of forming an overlapping part J1 by overlapping a surface 22a of the flange part 22 and a surface 10a of the wall member 10 by inserting the other end side of the cylindrical member 20 into the through-hole 11, a joining process of executing frictional agitation joining to the overlapping part J1 by relatively moving a joining rotary tool F along the peripheral edge of the flange part 22 in a state of contacting only an agitation pin F2 of the joining rotary tool F with only the flange part 22 or with both of the flange part 22 and the wall member 10 by inserting the joining rotary tool F from a reverse surface 22b of the flange part 22 and a removal process of cutting off an outside excess piece part of the flange part 22 together with a burr V with a recessed groove formed in a plasticization area W1 by the joining process with a boundary.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a joining method.

  There is known a wall member provided with a through hole and a joining method in which a tubular member with a flange portion is inserted into the through hole to join them together (Patent Document 1). In this joining method, the overlapped portion in which the surface of the wall member and the surface of the flange portion are overlapped is friction stir welded with a rotary tool.

Japanese Patent Laid-Open No. 10-15684

  In the conventional joining method, since burrs are generated after friction stir welding, there is a problem that the work of removing burrs using a cutting tool or the like becomes complicated.

  Then, this invention makes it a subject to provide the joining method which can remove a burr | flash easily.

In order to solve such a problem, the present invention provides a step of preparing a wall member having a through hole, a cylindrical member having a flange portion on one end side, and the other end side of the cylindrical member in the through hole. And inserting the rotating tool from the back surface of the flange portion, and placing only the stirring pin of the rotating tool. A joining step of performing friction stir welding on the overlapping portion by relatively moving the rotary tool along the periphery of the flange portion in a state where only the flange portion or both the flange portion and the wall member are in contact with each other. And a removing step of cutting off an excess piece portion on the outside of the flange portion together with burrs, with a concave groove formed in the plasticizing region in the joining step as a boundary.
Further, the present invention provides a preparation step of preparing a wall member having a through hole, a cylindrical member having a flange portion on one end side, and inserting the other end side of the cylindrical member into the through hole to form the flange portion. An arrangement step in which the surface of the wall member and the surface of the wall member are overlapped to form an overlapped portion, a rotating tool is inserted from the surface of the wall member, and only the stirring pin of the rotating tool is only the flange portion or the flange A step of friction stir welding to the overlapped portion by relatively moving the rotary tool along the periphery of the flange portion in a state where both the portion and the wall member are in contact with each other, and plasticity in the joining step And a removal step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the forming region as a boundary.
In addition, the present invention provides the flange member while communicating the wall member having the through hole, the preparation step of preparing the cylindrical member having the flange portion on one end side, and the hollow portion of the cylindrical member. A placement step of overlapping the back surface of the part and the surface of the wall member to form a superposed part, and inserting a rotating tool from the surface of the flange part, and only the stirring pin of the rotating tool only the flange part, or the A joining step of performing friction stir welding on the overlapping portion by relatively moving the rotary tool along a peripheral edge of the flange portion in a state where both the flange portion and the wall member are in contact with each other, and plasticity in the joining step And a removal step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the forming region as a boundary.
In addition, the present invention provides the flange member while communicating the wall member having the through hole, the preparation step of preparing the cylindrical member having the flange portion on one end side, and the hollow portion of the cylindrical member. A placement step of overlapping the back surface of the part and the surface of the wall member to form an overlapped part, and inserting a rotating tool from the surface of the wall member, and only the stirring pin of the rotating tool is only the flange part, or the A joining step of performing friction stir welding on the overlapping portion by relatively moving the rotary tool along a peripheral edge of the flange portion in a state where both the flange portion and the wall member are in contact with each other, and plasticity in the joining step And a removal step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the forming region as a boundary.

  According to such a joining method, the burr can be easily removed together with the surplus piece portion by bending the surplus piece portion outside the flange portion with the concave groove as a boundary.

  Moreover, it is preferable to set joining conditions so that a burr | flash generate | occur | produces on the outer side of the said flange part at the said joining process.

  According to this joining method, since the burrs can be concentrated on the surplus piece part, the removing step can be performed more easily.

  According to the joining method according to the present invention, burrs can be easily removed.

It is a perspective view which shows the wall member and cylindrical member of the joining method which concern on 1st embodiment of this invention. It is sectional drawing which shows the arrangement | positioning process which concerns on 1st embodiment. It is a perspective view which shows the joining process which concerns on 1st embodiment. It is sectional drawing which shows the joining process which concerns on 1st embodiment. It is sectional drawing which shows the removal process which concerns on 1st embodiment. It is a perspective view which shows the removal process after 1st embodiment. It is sectional drawing which shows the removal process after 1st embodiment. It is a perspective view which shows the joining process of the modification which concerns on 1st embodiment. It is sectional drawing which shows the arrangement | positioning process which concerns on 2nd embodiment. It is a perspective view which shows the joining process which concerns on 2nd embodiment. It is sectional drawing which shows the joining process which concerns on 2nd embodiment. It is sectional drawing which shows the removal process which concerns on 2nd embodiment.

[First embodiment]
A joining method according to a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the joining method according to the present embodiment joins the wall member 10 and the tubular member 20 by friction stirring. In the joining method according to the present embodiment, a preparation process, an arrangement process, a joining process, and a removing process are performed. In the following description, “front surface” means a surface opposite to the “back surface”.

  The preparation step is a step of preparing the wall member 10 and the cylindrical member 20. The wall member 10 is a plate-like member provided with a through hole 11 having a circular shape in plan view. The wall member 10 is made of an aluminum alloy in this embodiment. The material of the wall member 10 is appropriately selected from metals capable of friction stirring such as aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, and magnesium alloy.

  The tubular member 20 includes a tubular portion 21 and a flange portion 22. Although the cylindrical member 20 should just be a metal which can be friction-stirred, in this embodiment, it is formed with the same metal as the wall member 10. The cylinder portion 21 has a cylindrical shape. The outer diameter of the cylindrical portion 21 is substantially the same as the inner diameter of the through hole 11. The flange portion 22 protrudes outward from the tube portion 21 at the end of the tube portion 21 and has a plate shape.

  An arrangement | positioning process is a process of arrange | positioning the cylindrical member 20 in the wall member 10, as shown in FIG. In the placement step, the cylindrical portion 21 of the cylindrical member 20 is inserted into the through hole 11 of the wall member 10, and the overlapping portion J1 is formed by superimposing the surface 10a of the wall member 10 and the surface 22a of the flange portion 22. . The overlapping portion J1 is formed in a ring shape around the through hole 11.

  A joining process is a process of carrying out friction stir welding of the superposition | polymerization part J1 using the rotation tool F for joining, as shown in FIG.3 and FIG.4. 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 the rotating shaft of the friction stirrer. The connecting part 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 is tapered as it is separated from the connecting portion F1. The length of the stirring pin F <b> 2 is larger than the plate thickness of the flange portion 22. 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 wall member 10 and the cylindrical member 20) can be decreased.

  In the joining step, the joining rotation tool F rotated to the right is inserted into the back surface 22b of the flange portion 22 and is rotated once along the overlapping portion J1 (along the outer peripheral edge of the flange portion 22) to join the overlapping portion J1. . As shown in FIG. 4, in the joining step, friction stir welding is performed in a state where the connecting portion F1 is not in contact with the flange portion 22, that is, in a state where the proximal end side of the stirring pin F2 is exposed. That is, in this embodiment, the insertion depth of the joining rotary tool F is set so that the stirring pin F2 contacts both the wall member 10 and the flange portion 22. In the joining step, joining may be performed to such an extent that the stirring pin F2 does not reach the wall member 10, that is, only the stirring pin F2 is in contact with only the flange portion 22. In this case, the overlapping portion J1 is plastically fluidized and joined by frictional heat between the stirring pin F2 and the flange portion 22.

  A plasticized region W1 is formed in the movement locus of the welding rotary tool F. In the joining process, the joining rotary tool F is relatively moved so that the plasticized region W1 is a closed loop having a circular shape in plan view. The joining rotary tool F may be moved in any direction, but in this embodiment, the joining rotary tool F is moved so as to be counterclockwise with respect to the central axis X.

  In the present embodiment, the joining rotary tool is arranged such that the shear side (advancing side: the side where the moving speed of the rotating tool is added to the tangential speed on the outer periphery of the rotating tool) is inside the flange portion 22. The movement direction and rotation direction of F are set. 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 compared with 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). However, since the temperature of the plastic fluidized material is likely to rise, a groove is formed on the shear side in the plasticized region W1, and a large number of burrs V tend to be generated on the shear side outside 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 a concave groove is generated on the flow side in the plasticizing region W1 due to the high rotational speed. However, many burrs V tend to be generated on the flow side outside the plasticized region W1.

  In the present embodiment, since the rotational speed of the joining rotary tool F is set high, as shown in FIG. 5, a concave groove D is generated on the flow side in the plasticizing region W1, and the outside of the plasticizing region W1. There is a tendency that many burrs V are generated on the flow side. The concave groove D is a part that is deeper in the plasticized region W1. 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 joining process, which side of the traveling direction of the joining rotary tool F the burr V is generated differs depending 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, the material of the wall member 10 and the cylindrical member 20, the wall member 10 And a combination of these elements such as the thickness of the flange portion 22 and the like. If the side where the burr V is generated or the side where a lot of burr V is generated is set on the outer edge side of the flange portion 22 according to the joining conditions, the concave groove D formed in the plasticized region W1 is also the flange portion 22. Since the removal process mentioned later can be performed easily, it is preferable.

  In the joining process, the joining rotary tool F is made to make a round and the joining rotary tool F is detached in the plasticizing region W1. In the joining step, the start end and the rear end of the plasticized region W1 are overlapped.

  As shown in FIG. 5, the removing step is a step of cutting off the surplus piece portion 23 that is a part of the flange portion 22. The surplus piece portion 23 is a portion of the flange portion 22 that is cut off with the plasticized region W1 as a boundary. In the present embodiment, a portion outside the concave groove D formed in the flange portion 22 is used as the surplus piece portion 23.

  In the removing step, the excess piece portion 23 is removed by bending it while turning up the end portion. Thereby, as shown in FIG.6 and FIG.7, the outer periphery of the flange part 22 is edged by the plasticization area | region W1. In the removing step, the surplus piece portion 23 may be bent using an apparatus, but in the present embodiment, it is manually bent and excised. As described above, the wall member 10 and the tubular member 20 are joined.

  According to the joining method described above, the burr V can be easily removed together with the surplus piece portion 23 by bending the surplus piece portion 23 outside the flange portion 22. Further, as shown in FIGS. 6 and 7, since the outer peripheral edge of the flange portion 22 is trimmed in the plasticized region W1, it is possible to finish it finely without performing a separate burr removal process using a cutting tool or the like. it can.

  Moreover, as shown in FIG. 5, according to this embodiment, the ditch | groove D is formed in the plasticization area | region W1 and the outer side (outside with respect to the flange part 22) of the joining centerline C. As shown in FIG. Further, since the burrs V are formed outside the plasticized region W1 and outside the bonding center line C, the burrs V can be efficiently cut out together with the surplus piece portion 23. Thereby, while the surplus piece part 23 to cut off can be made small and a junction part (plasticization area | region W1) can remain large, joining strength can be raised.

  Further, in the joining process, friction stir welding is performed by relatively moving along the overlapping portion J1 while only the stirring pin F2 is in contact with the wall member 10 and the flange portion 22, or only the flange portion 22 is in contact. Since the friction stir welding is performed by relatively moving along the overlapping portion J1, the overlapping portion J1 at a deep position can be joined without applying a large load to the friction stirrer.

  Further, in the joining step, friction stir welding is performed in a state where only the stirring pin F2 is in contact with the wall member 10 and the flange portion 22, or friction stir welding is performed in a state where only the stirring portion F2 is in contact with the shoulder portion. The width of the plasticized region W1 can be reduced as compared with the case where the plastic member is pushed into the wall member 10 and the flange portion 22. Thereby, even if it does not enlarge the width | variety (overhang | projection length) of the flange part 22, a joining margin can be ensured. Thereby, the freedom degree of design of the cylindrical member 20 (flange part 22) can be raised.

  FIG. 8 is a perspective view showing a joining process of a modification according to the first embodiment. As shown in FIG. 8, in the joining process of the modification, the start position Sp of the joining rotary tool F is set on the surface 10 a of the wall member 10. In the joining step, after inserting the joining rotation tool F rotated to the right at the start position Sp, the joining rotation tool F is inserted into the flange portion 22, and the joining rotation tool F is relatively moved along the overlapping portion J1.

  Further, the slit 25 may be formed at the edge of the flange portion 22. The slit 25 extends from the edge of the flange portion 22 toward the center. When performing the joining process, the moving route of the joining rotary tool F is set so that a part of the plasticizing region W1 comes into contact with the slit 25. When performing the removal process, the removal process can be more easily performed by bending the slit 25 so as to be turned. In the modified example, the other steps are the same as those in the first embodiment, and thus description of common parts is omitted.

[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, a preparation process, an arrangement process, a joining process, and a removing process are performed. In the joining method according to the second embodiment, the arrangement step is mainly different from the first embodiment.

  The placement step is a step of placing the tubular member 20 on the wall member 10 as shown in FIG. In the arranging step, the back surface 22b of the flange portion 22 is overlapped with the front surface 10a of the wall member 10 while the through hole 11 of the wall member 10 and the hollow portion of the cylindrical portion 21 of the cylindrical member 20 are communicated. The overlapping portion J2 is formed by superimposing the front surface 10a of the wall member 10 and the back surface 22b of the flange portion 22.

  As shown in FIGS. 10 and 11, the joining step is a step of friction stir welding the superposed portion J <b> 2 using the joining rotary tool F. In the joining step, as shown in FIG. 10, after inserting the rotating tool F for joining rotated to the start position Sp set on the surface 10 a of the wall member 10, the tool is plunged into the flange portion 22 to enter the overlapping portion J <b> 2. It is made to make a round around the cylinder part 21 along. In this embodiment, in order to rotate the welding rotary tool F counterclockwise, the welding rotary tool F is relatively moved so as to be counterclockwise with respect to the cylindrical portion 21. A plasticized region W2 is formed on the movement locus of the welding rotary tool F. In the present embodiment, in order to rotate the welding rotary tool F counterclockwise, the spiral groove of the stirring pin F2 is formed so as to rotate clockwise from the proximal end side toward the distal end side.

  As shown in FIG. 11, in the joining step, the friction stir welding is performed in a state where the connecting portion F1 is not in contact with the flange portion 22, that is, in a state where the proximal end side of the stirring pin F2 is exposed. That is, in this embodiment, the insertion depth of the joining rotary tool F is set so that the stirring pin F2 contacts both the wall member 10 and the flange portion 22. In the joining step, joining may be performed to such an extent that the stirring pin F2 does not reach the wall member 10, that is, only the stirring pin F2 is in contact with only the flange portion 22. In this case, the overlapping portion J2 is plastically fluidized and joined by frictional heat between the stirring pin F2 and the flange portion 22.

  The removal step is a step of cutting off the surplus piece portion 23 that is a part of the flange portion 22, as shown in FIG. The surplus piece portion 23 is a portion of the flange portion 22 that is cut off with the plasticized region W2 as a boundary. In the present embodiment, a portion outside the concave groove D formed in the flange portion 22 is used as the surplus piece portion 23.

  In the removing step, the excess piece portion 23 is removed by bending it while turning up the end portion. Thereby, the outer periphery of the flange part 22 is edged by the plasticization area | region W2. In the removing step, the surplus piece portion 23 may be bent using an apparatus, but in the present embodiment, it is manually bent and excised. As described above, the wall member 10 and the tubular member 20 are joined. Note that, as in the above-described modification, a slit may be provided in the flange portion 22, and the excess piece portion 23 may be removed by turning up the excess piece portion 23 starting from the slit.

  The bonding method according to the second embodiment described above can achieve the same effects as the first embodiment. In the joining process of the second embodiment, the joining rotary tool F may be directly inserted into the surface 22a of the flange portion 22.

  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, prior to the joining step, a temporary joining step of temporarily joining the overlapping portion J1 may be included. The temporary joining step may be welding or may be performed by friction stirring using a rotating tool. Thereby, the opening of the superposition | polymerization part J1, J2 in the case of a joining process can be prevented.

  Moreover, in this embodiment, although the cylinder part 21 was made into the cylinder, it is good also as a cylinder shape of a cross-sectional elliptical shape or a cross-sectional polygonal shape. In that case, the through-hole 11 is also changed according to the shape of the cylinder part 21. Moreover, you may perform a joining process in the state which inclined the rotation center axis | shaft of the rotation tool F for joining to the outer side (outside with respect to the central axis X). Thereby, while being able to avoid contact with connecting part F1 and a friction stirrer, and cylinder part 21, the width of flange part 22 can also be made small. At this time, the joining rotary tool F is preferably attached to an arm robot provided with a driving means such as a spindle unit at the tip. Thereby, the rotation center axis | shaft of the rotation tool F for joining can be inclined easily.

DESCRIPTION OF SYMBOLS 10 Wall member 10a Front surface 10b Back surface 11 Through-hole 20 Cylindrical member 21 Cylindrical part 22 Flange part 22a Front surface 22b Back surface 23 Surplus piece part D Concave groove F Joining rotary tool (rotary tool)
J1 superposition part V burr W1 plasticization region

Claims (6)

A preparation step of preparing a wall member having a through-hole and a cylindrical member having a flange portion on one end side;
An arrangement step of inserting the other end side of the tubular member into the through hole and overlapping the surface of the flange portion and the surface of the wall member to form a superposed portion;
A rotating tool is inserted from the back surface of the flange portion, and only the stirring pin of the rotating tool is in contact with only the flange portion or both the flange portion and the wall member, along the periphery of the flange portion. A joining step for performing friction stir welding on the overlapping portion by relatively moving the rotary tool;
And a removing step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the plasticizing region in the joining step as a boundary. A preparation step of preparing a wall member having a through-hole and a cylindrical member having a flange portion on one end side;
An arrangement step of inserting the other end side of the tubular member into the through hole and overlapping the surface of the flange portion and the surface of the wall member to form a superposed portion;
A rotating tool is inserted from the surface of the wall member, and only the stirring pin of the rotating tool is in contact with only the flange portion or both the flange portion and the wall member, along the periphery of the flange portion. A joining step for performing friction stir welding on the overlapping portion by relatively moving the rotary tool;
And a removing step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the plasticizing region in the joining step as a boundary. A preparation step of preparing a wall member having a through-hole and a cylindrical member having a flange portion on one end side;
An arrangement step of overlapping the back surface of the flange portion and the surface of the wall member to form a superposed portion while communicating the through hole and the hollow portion of the cylindrical member,
A rotary tool is inserted from the surface of the flange portion, and only the stirring pin of the rotary tool is in contact with only the flange portion or both the flange portion and the wall member, and along the periphery of the flange portion. A joining step of performing a friction stir welding on the overlapping portion by relatively moving a rotary tool;
And a removing step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the plasticizing region in the joining step as a boundary. A preparation step of preparing a wall member having a through-hole and a cylindrical member having a flange portion on one end side;
An arrangement step of overlapping the back surface of the flange portion and the surface of the wall member to form a superposed portion while communicating the through hole and the hollow portion of the cylindrical member,
A rotating tool is inserted from the surface of the wall member, and only the stirring pin of the rotating tool is in contact with only the flange portion, or both the flange portion and the wall member, and along the periphery of the flange portion. A joining step of performing a friction stir welding on the overlapping portion by relatively moving a rotary tool;
And a removing step of cutting off an excess piece portion outside the flange portion together with burrs, with a concave groove formed in the plasticizing region in the joining step as a boundary.   The joining method according to any one of claims 1 to 4, wherein in the joining step, joining conditions are set so that burrs are generated outside the flange portion.   The joining method according to claim 1, wherein the through hole has a circular shape, and the cylindrical portion of the cylindrical member has a cylindrical shape.

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