JP6662207B2 - Joining method - Google Patents

Description

  The present invention relates to a joining method.

  There is known a joining method in which a wall member having a through hole and a tubular member with a flange portion are inserted into the through hole to join the two members together (Patent Document 1). In this joining method, the overlapped portion where 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 Application Laid-Open No. Hei 10-15677

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

  Therefore, an object of the present invention is to provide a bonding method that can easily remove burrs.

In order to solve such a problem, the present invention provides a wall member having a through hole, a preparation step of preparing a cylindrical member having a flange portion on one end side, and the other end side of the cylindrical member in the through hole. An arrangement step of inserting and superimposing the surface of the flange portion and the surface of the wall member to form an overlapped portion, and inserting a rotating tool from the back surface of the flange portion, and only the stirring pin of the rotating tool is A joining step of performing relative friction stir welding to the overlapped portion by relatively moving the rotating tool along the periphery of the flange portion in a state of being in contact with only the flange portion or both the flange portion and the wall member. And a removing step of cutting off a surplus piece outside the flange together with burrs at a boundary of the groove formed in the plasticized region in the joining step.
Also, the present invention provides a wall member having a through hole, a preparing step of preparing 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 of superimposing the surface of the wall member and the surface of the wall member to form a superimposed portion, and inserting the rotating tool from the surface of the wall member and then protruding into the flange portion, and using only the stirring pin of the rotating tool. Joining in which the rotary tool is relatively moved along the periphery of the flange portion in a state of being in contact with only the flange portion or both the flange portion and the wall member to perform friction stir welding on the overlapped portion. And a removing step of cutting off a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the plasticized region in the joining step.
Also, the present invention provides a wall member having a through hole, a preparation step of preparing a cylindrical member having a flange portion at one end side, and the flange member while allowing the through hole to communicate with the hollow portion of the cylindrical member. An arrangement step of superimposing the back surface of the portion and the surface of the wall member to form an overlapped portion, inserting a rotating tool from the surface of the flange portion, and only stirring the stirring pin of the rotating tool only the flange portion, or A joining step in which the rotary tool is relatively moved along a peripheral edge of the flange portion in a state of being in contact with both the flange portion and the wall member to perform friction stir welding on the overlapped portion; And removing a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the formation region.
Also, the present invention provides a wall member having a through hole, a preparation step of preparing a cylindrical member having a flange portion at one end side, and the flange member while allowing the through hole to communicate with the hollow portion of the cylindrical member. An arrangement step of superimposing the back surface of the portion and the surface of the wall member to form an overlapped portion, and inserting the rotary tool from the surface of the wall member and then protruding into the flange portion, and only the stirring pin of the rotary tool. The friction stir welding is performed on the overlapping portion by relatively moving the rotating tool along the peripheral edge of the flange portion in a state where the flange portion is in contact with only the flange portion or both the flange portion and the wall member. And a removing step of cutting off a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the plasticized region in the joining step.

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

  In the joining step, it is preferable to set joining conditions so that burrs are generated outside the flange portion.

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

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

It is a perspective view showing a wall member and a cylindrical member of a joining method concerning a first embodiment of the present invention. It is sectional drawing which shows the arrangement | positioning process which concerns on 1st embodiment. It is a perspective view showing the joining process concerning a first 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 showing after a removal process concerning a first embodiment. FIG. 4 is a cross-sectional view illustrating a state after a removing step according to the first embodiment. It is a perspective view showing the joining process of the modification concerning a first embodiment. It is sectional drawing which shows the arrangement | positioning process which concerns on 2nd embodiment. It is a perspective view showing the joining process concerning a second 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 bonding method according to the present embodiment, a preparation step, an arrangement step, a bonding step, and a removing step are performed. In the following description, “front surface” means a surface opposite to “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 having a circular through hole 11 in a plan view. The wall member 10 is formed of an aluminum alloy in the present embodiment. The material of the wall member 10 is appropriately selected from friction stirable metals 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. The tubular member 20 may be made of a metal that can be friction-stirred, but is formed of the same metal as the wall member 10 in the present embodiment. The cylindrical portion 21 has a cylindrical shape. The outer diameter of the cylindrical portion 21 is substantially equal to the inner diameter of the through hole 11. The flange portion 22 vertically projects outward from the cylindrical portion 21 at the end of the cylindrical portion 21 and has a plate shape.

  The arranging step is a step of arranging the tubular member 20 on the wall member 10 as shown in FIG. In the arranging step, the tubular portion 21 of the tubular member 20 is inserted into the through hole 11 of the wall member 10, and the surface 10a of the wall member 10 and the surface 22a of the flange portion 22 are overlapped to form the overlapped portion J1. . The overlapping portion J1 is formed in a ring shape around the through hole 11.

  The joining step is a step of friction stir welding the overlapped portion J1 using the joining rotary tool F as shown in FIGS. The joining rotary tool F includes a connecting portion F1 and a stirring pin F2. The joining rotary tool F corresponds to a “rotating tool” in the claims. The joining rotary tool F is made of, for example, tool steel. The connection part F1 is a part connected to the rotating shaft of the friction stirrer. The connecting portion F1 has a columnar shape.

  The stirring pin F2 hangs down from the connecting portion F1 and is coaxial with the connecting portion F1. The stirring pin F2 tapers as it moves away from the connecting portion F1. The length of the stirring pin F2 is larger than the thickness of the flange portion 22. A spiral groove is engraved on the outer peripheral surface of the stirring pin F2. In this embodiment, in order to rotate the joining rotary tool F clockwise, the spiral groove is formed counterclockwise from the base end toward the tip.

  In addition, when rotating the joining rotary tool F counterclockwise, it is preferable to form the spiral groove clockwise from the base end toward the tip end. By setting the spiral groove in this way, the metal plastically fluidized at the time of friction stirring is guided to the tip side of the stirring pin F2 by the spiral groove. Thereby, the amount of metal that overflows to the outside of the metal members to be joined (the wall member 10 and the cylindrical member 20) can be reduced.

  In the joining step, the joining rotating tool F that has been rotated clockwise is inserted into the back surface 22b of the flange portion 22, and is rotated around the overlapped portion J1 (along the outer peripheral edge of the flange portion 22) to join the overlapped 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 base end side of the stirring pin F2 is exposed. That is, in the present embodiment, the insertion depth of the joining rotary tool F is set such that the stirring pin F2 contacts both the wall member 10 and the flange portion 22. In the joining step, the 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 brought into contact with only the flange portion 22. In this case, the overlapping portion J1 is plastically fluidized by friction heat between the stirring pin F2 and the flange portion 22 and joined.

  A plasticizing region W1 is formed on the movement trajectory of the joining rotary tool F. In the joining step, the joining rotary tool F is relatively moved so that the plasticized region W1 becomes a circular closed loop 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 this embodiment, the joining rotary tool F is arranged such that 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) of the joining rotary tool F is located inside the flange portion 22. The moving direction and the rotating 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 rotation speed of the joining rotary tool F is low, the shear side is closer to the flow side of the flange portion 22 (retreating side: the side on which 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 plastic fluidized material tends to rise more easily, a concave groove is formed on the shear side in the plasticized region W1, and a lot of burrs V tend to be generated on the shear side outside the plasticized region W1. On the other hand, for example, when the rotation speed of the joining rotary tool F is high, although the temperature of the plastic flow material increases on the shear side, a groove is generated on the flow side in the plasticization region W1 due to the high rotation speed. However, a large amount of burrs V tend to be generated on the flow side outside the plasticizing region W1.

  In the present embodiment, since the rotation speed of the joining rotary tool F is set to be high, a concave groove D is generated on the flow side in the plasticized region W1 as shown in FIG. Many burrs V tend to occur on the flow side. The concave groove D is a part of the plasticized region W1 that is deepened. Further, by setting the rotation speed of the joining rotary tool F to be high, the moving speed (feeding speed) of the joining rotary tool F can be increased. Thereby, the joining cycle can be shortened.

  In the joining step, on which side in the traveling direction of the joining rotary tool F the burrs V are generated depends on the joining conditions. The joining conditions include the rotation speed, the rotation direction, the moving speed (feed speed) of the joining rotary tool F, 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 It is determined by each element such as the thickness of the flange portion 22 and the combination of these elements. If the side where burrs V occur or the side where many burrs V occur is set to be the outer edge side of the flange portion 22 according to the joining conditions, the concave groove D formed in the plasticized region W1 also This is preferable since it tends to be formed on the outside of the substrate, and the removal step described later can be easily performed.

  In the joining step, the joining rotary tool F is caused to make one round to separate the joining rotary tool F in the plasticized region W1. In the joining step, the start end and the rear end of the plasticized region W1 are made to overlap.

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

  In the removing step, the excess piece portion 23 is removed while being bent while being turned up. Thereby, as shown in FIGS. 6 and 7, the outer peripheral edge of the flange portion 22 is framed in the plasticized region W1. In the removing step, the surplus piece portion 23 may be bent using an apparatus, but in the present embodiment, the surplus piece portion 23 is bent and cut off manually. Thus, 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 23 by bending the surplus piece 23 outside the flange 22. In addition, as shown in FIGS. 6 and 7, since the outer peripheral edge of the flange portion 22 is edged in the plasticizing region W1, it is possible to cleanly finish without performing a step of separately removing burrs using a cutting tool or the like. it can.

  Further, as shown in FIG. 5, according to the present embodiment, the concave groove D is formed in the plasticized region W1 and outside the joining center line C (outside the flange portion 22). Further, since the burrs V are formed outside the plasticized region W1 and outside the joining center line C, the burrs V can be efficiently removed together with the surplus pieces 23. Thereby, the excess piece portion 23 to be cut can be reduced, and the bonding portion (plasticized region W1) can be largely left, so that the bonding strength can be increased.

  In the joining step, 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 in a state where only the flange portion 22 is contacted. The friction stir welding is performed by relatively moving along the overlapping portion J1, so that the overlapping portion J1 at a deep position can be joined without applying a large load to the friction stirrer.

  In addition, 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 in which the stirring pin F2 is in contact only with the flange portion 22. The width of the plasticized region W1 can be reduced as compared with the case where the width is pushed into the wall member 10 and the flange portion 22. Thereby, the joining margin can be ensured without increasing the width (overhang length) of the flange portion 22. Thereby, the degree of freedom in designing the tubular member 20 (flange portion 22) can be increased.

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

  Further, a slit 25 may be formed at the edge of the flange portion 22. The slit 25 extends from the edge of the flange 22 toward the center. When performing the joining step, the movement route of the joining rotary tool F is set such that a part of the plasticized region W1 contacts the slit 25. When performing the removing step, the removing step can be performed more easily by folding the slit 25 so as to turn the slit 25 as a starting point. In the modified example, other steps are the same as those in the first embodiment, and the description of the common parts will be omitted.

[Second embodiment]
Next, a joining method according to a second embodiment of the present invention will be described. In the bonding method according to the second embodiment, a preparation step, an arrangement step, a bonding step, and a removing step are performed. In the joining method according to the second embodiment, an arrangement step is different from that of the first embodiment.

  The arranging step is a step of arranging the tubular member 20 on the wall member 10 as shown in FIG. In the disposing step, the back surface 22b of the flange portion 22 is superimposed on the front surface 10a of the wall member 10 while allowing the through hole 11 of the wall member 10 to communicate with the hollow portion of the cylindrical portion 21 of the cylindrical member 20. The overlapping portion J2 is formed by overlapping the front surface 10a of the wall member 10 and the back surface 22b of the flange portion 22.

  The joining step is, as shown in FIGS. 10 and 11, a friction stir welding of the overlapped portion J2 using the rotating tool F for joining. In the joining step, as shown in FIG. 10, after inserting the joining rotating tool F that has been rotated counterclockwise to the start position Sp set on the surface 10 a of the wall member 10, the joining rotating tool F is inserted into the flange portion 22 to enter the overlapping portion J2. Along the circumference of the cylindrical portion 21. In this embodiment, in order to rotate the joining rotary tool F counterclockwise, the joining rotary tool F is relatively moved so as to turn counterclockwise with respect to the cylindrical portion 21. A plasticizing region W2 is formed on the movement trajectory of the joining rotary tool F. In the present embodiment, the spiral groove of the stirring pin F2 is formed so as to turn clockwise from the base end side to the tip end side in order to rotate the joining rotary tool F counterclockwise.

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

  As shown in FIG. 12, the removing step is a step of cutting off the surplus piece 23 which is a part of the flange 22. The surplus piece portion 23 is a portion of the flange portion 22 that is cut off at the boundary of the plasticized region W2. In the present embodiment, a portion outside the groove D formed in the flange portion 22 is defined as a surplus piece portion 23.

  In the removing step, the excess piece portion 23 is removed while being bent while being turned up. Thereby, the outer peripheral edge of the flange portion 22 is framed in the plasticizing region W2. In the removing step, the surplus piece portion 23 may be bent using an apparatus, but in the present embodiment, the surplus piece portion 23 is bent and cut off manually. Thus, the wall member 10 and the tubular member 20 are joined. As in the above-described modified example, a slit may be provided in the flange portion 22 and the surplus piece 23 may be removed by turning up the surplus piece 23 from the slit as a starting point.

  The bonding method according to the second embodiment described above can also achieve the same effects as the first embodiment. In the joining step 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, before the joining step, a temporary joining step of temporarily joining the overlapped portion J1 may be included. The temporary joining step may be performed by welding or by friction stirring using a rotating tool. Thereby, it is possible to prevent the overlap of the overlapping portions J1 and J2 in the joining step.

  Further, in the present embodiment, the cylindrical portion 21 is a cylinder, but may be a cylindrical shape having an elliptical cross section or a polygonal cross section. In that case, the through hole 11 is also changed according to the shape of the cylindrical portion 21. The joining step may be performed in a state where the rotation center axis of the joining rotary tool F is inclined outward (outward with respect to the center axis X). Thereby, contact between the connecting portion F1 and the friction stirrer and the cylindrical portion 21 can be avoided, and the width of the flange portion 22 can be reduced. At this time, it is preferable that the joining rotary tool F is attached to an arm robot having a driving means such as a spindle unit at the tip. Thus, the rotation center axis of the joining rotary tool F can be easily inclined.

DESCRIPTION OF SYMBOLS 10 Wall member 10a Front surface 10b Back surface 11 Through hole 20 Cylindrical member 21 Cylindrical portion 22 Flange portion 22a Surface 22b Back surface 23 Excess piece D Ditch F Joining rotary tool (rotating tool)
J1 overlapped part V burr W1 plasticized area

Claims (6)

A wall member having a through-hole, a preparation step of preparing 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 superimposing the surface of the flange portion and the surface of the wall member to form an overlapped portion;
Insert the rotating tool from the back of the flange, along the periphery of the flange, with only the stirring pin of the rotating tool in contact with only the flange, or both the flange and the wall member A joining step of relatively moving the rotating tool to perform friction stir welding on the overlapped portion,
A removing step of cutting off a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the plasticized region in the joining step. A wall member having a through-hole, a preparation step of preparing 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 superimposing the surface of the flange portion and the surface of the wall member to form an overlapped portion;
While inserting the rotating tool from the surface of the wall member and then protruding into the flange portion, with only the stirring pin of the rotating tool contacting only the flange portion or both the flange portion and the wall member, A joining step of relatively moving the rotating tool along the periphery of the flange portion to perform friction stir welding on the overlapped portion;
A removing step of cutting off a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the plasticized region in the joining step. A wall member having a through-hole, a preparation step of preparing 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 an overlapped portion while allowing the through-hole and the hollow portion of the tubular member to communicate with each other,
A rotary tool is inserted from the surface of the flange portion, and only the stirring pin of the rotary tool is brought into contact with only the flange portion or both of the flange portion and the wall member along the peripheral edge of the flange portion. A joining step of relatively moving the rotating tool to perform friction stir welding on the overlapped portion,
A removing step of cutting off a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the plasticized region in the joining step. A wall member having a through-hole, a preparation step of preparing 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 an overlapped portion while allowing the through-hole and the hollow portion of the tubular member to communicate with each other,
While inserting the rotary tool from the surface of the wall member and then rushing into the flange portion, 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. A joining step of relatively moving the rotary tool along the periphery of the flange portion to perform friction stir welding on the overlapped portion;
A removing step of cutting off a surplus piece part outside the flange part together with a burr at a boundary of the concave groove formed in the plasticized region in the joining step.   The joining method according to any one of claims 1 to 4, wherein in the joining step, joining conditions are set such that burrs are generated outside the flange portion.   The joining method according to any one of claims 1 to 5, wherein the through-hole has a circular shape, and a tubular portion of the tubular member has a cylindrical shape.

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