JP2018065165A - Manufacturing method of cylindrical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a cylindrical member which prevents metal shortage of a welding part from occurring and can cause a cross-section to resemble to a circular shape.SOLUTION: A manufacturing method of a cylindrical member includes: a butting process of forming a cylindrical member 1A to be welded by rounding a flat planar metal plate 1 and, at the same time, forming a butting part J1 by butting end surfaces to each other; an auxiliary member arrangement process of arranging a curved surface part K1 formed on a backing fixture K onto the outer circumferential surface side of the butting part J1 and, at the same time, arranging an auxiliary member 10 so as to run along the butting part J1 on an inner circumferential surface of the cylindrical member 1A to be welded; and a friction stir process of relatively moving a welding rotary tool F along the butting part J1 and performing friction stir welding of the butting part J1 while inserting a rotary stirring pin F2 from the surface 10a side of the auxiliary member 10 and bringing only the stirring pin F2 into contact with the cylindrical member 1A to be welded and the auxiliary member 10.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing a cylindrical member.

  For example, Patent Document 1 discloses a joining method in which two metal members having a substantially arc-shaped cross section are joined by friction stirring. In the conventional joining method, as shown in FIG. 11, a butting process of joining the metal members 52 and 52 and a friction stirring process of joining with the rotary tool 61 are performed. In the butting process, the end surfaces of the metal members 52 and 52 are butted together to form the butting portion 54. Further, a backing jig 60 is disposed on the back side of the butting portion 54. In the friction stirring process, the stirring pin 61a of the rotating rotary tool 61 is inserted into the abutting portion 54, and the shoulder portion 61b is pushed into the abutting portion 54 by about several millimeters to perform friction agitation.

  Flat end portions 56 and 65 are respectively formed in portions of the inner peripheral surfaces of the metal members 52 and 52 corresponding to the abutting portion 54. In the butting process, when the metal members 52 and 52 are butted together, one flat portion (flat surface) is formed on a part of the inner peripheral surface, and the end faces are butted together without a gap. As a result, the metal that is plastically fluidized can be reliably pressed by the shoulder portion 61b of the rotary tool 61, and the joining portion can be prevented from becoming insufficient in metal.

JP-A-11-267858

  Here, for example, with reference to the above-described prior art, it is conceivable to manufacture a cylindrical member by rounding one plate-shaped metal member. In this case, it is conceivable that a flat portion is provided on the end portion side of the inner peripheral surface of the plate-shaped metal member, and one end portion (flat surface) is formed on the inner peripheral surface when the end surfaces are brought into contact with each other. . However, the manufacturing method has a problem that the inner peripheral surfaces of the joined cylindrical members are not circular.

  On the other hand, without forming a flat portion on the inner peripheral surface, it is conceivable that the metal plates are rolled into a cylindrical shape, end surfaces are butted together, and the butted portions are friction stir welded. However, in this case, a V-shaped gap that gradually separates toward the outer peripheral surface side is inevitably formed in the abutting portion. Thereby, when performing a friction stirring process, there exists a problem that a junction part becomes metal shortage.

  Then, this invention makes it a subject to provide the manufacturing method of the cylindrical member which can make an inner peripheral surface and an outer peripheral surface approximate circularly while preventing the metal shortage of a junction part.

  In order to solve the above-mentioned problem, the present invention is a method of manufacturing a cylindrical member using a rotary tool provided with a stirring pin, and rounds a flat metal plate to form a cylindrical member to be joined. A butting step of butting the end surfaces together to form a butting portion and a curved surface portion formed on the backing jig on the outer circumferential surface side of the butting portion, and on the inner circumferential surface of the cylindrical member to be joined An auxiliary member arranging step of arranging the auxiliary member along the abutting portion, the rotating stirring pin is inserted from the surface side of the auxiliary member, and only the stirring pin is inserted into the cylindrical member to be joined and the auxiliary member. And a friction stir process in which the rotating tool is relatively moved along the abutting portion and the abutting portion is friction stir welded.

According to this manufacturing method, in the friction stirring step, the backing jig having the curved surface portion is arranged on the outer peripheral surface of the cylindrical member to be joined, and the butt portion is friction stir welded. Further, since the rotary tool is relatively moved while only the stirring pin is in contact with the cylindrical member to be joined and the auxiliary member, there is no need to provide a flat portion on the inner peripheral surface of the cylindrical member to be joined. Thereby, the inner peripheral surface and outer peripheral surface of a cylindrical member can be approximated to a circle.
In addition, although a V-shaped gap is formed in the butt portion, in order to perform friction stir welding with a stirring pin from the inner peripheral surface side in a state where the auxiliary member is arranged on the inner peripheral surface of the cylindrical member to be joined, It is possible to prevent the joint from becoming insufficient in metal. Further, in the friction stirring step, since only the stirring pin is joined in contact with the cylindrical member to be joined and the auxiliary member, the load on the friction stirring device can be reduced.

  Moreover, it is preferable to include the removal process which removes the said auxiliary member in which the burr | flash was formed from the said cylindrical to-be-joined member. According to this manufacturing method, the burr can be easily removed together with the auxiliary member.

  In the friction stirring step, it is preferable to set the joining conditions so that burrs generated in the friction stir welding are formed on the auxiliary member. According to this manufacturing method, the burr can be easily removed together with the auxiliary member.

  Further, in the auxiliary member arranging step, the auxiliary member is arranged on one side with the butting portion interposed therebetween, and slightly protrudes on the other side so that the auxiliary member does not remain on the other side after the friction stirring step. In the friction stir step, it is preferable to set the joining conditions so that burrs generated in the friction stir welding are formed in the auxiliary member on the one side.

  According to this manufacturing method, it is possible to prevent the metal shortage of the joint portion in a well-balanced manner, and it is only necessary to remove the auxiliary member remaining only on one side with respect to the joint portion. it can.

  According to the manufacturing method of the cylindrical member which concerns on this invention, while preventing the metal shortage of a junction part, an inner peripheral surface and an outer peripheral surface can be approximated circularly.

It is a perspective view which shows the preparatory process of the manufacturing method of the cylindrical member which concerns on 1st embodiment of this invention. It is a perspective view which shows the butt | matching process of the manufacturing method of the cylindrical member which concerns on 1st embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the manufacturing method of the cylindrical member which concerns on 1st embodiment. It is a perspective view which shows the tab material arrangement | positioning process of the manufacturing method of the cylindrical member which concerns on 1st embodiment. It is a perspective view which shows the friction stirring process of the manufacturing method of the cylindrical member which concerns on 1st embodiment. It is sectional drawing which shows the friction stirring process of the manufacturing method of the cylindrical member which concerns on 1st embodiment. It is sectional drawing which shows the removal process of the manufacturing method of the cylindrical member which concerns on 1st embodiment. It is sectional drawing which shows the auxiliary member arrangement | positioning process of the manufacturing method of the cylindrical member which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the friction stirring process of the manufacturing method of the cylindrical member which concerns on 2nd embodiment. It is sectional drawing which shows the removal process of the manufacturing method of the cylindrical member which concerns on 2nd embodiment. It is sectional drawing for demonstrating the manufacturing method of the cylindrical member of patent document 1. FIG.

[First embodiment]
The manufacturing method of the cylindrical member which concerns on 1st embodiment of this invention is demonstrated in detail with reference to drawings. In the joining method according to the present embodiment, a preparation process, a butting process, an auxiliary member arranging process, a tab material arranging process, a friction stirring 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 metal plate 1 and the backing jig K as shown in FIG. The metal plate 1 is a rectangular plate member. The material of the metal plate 1 is not particularly limited as long as it is a metal capable of friction stir, but may be appropriately selected from, for example, aluminum, aluminum alloy, copper, copper alloy, titanium, titanium alloy, magnesium, magnesium alloy and the like.

  The backing jig K is a jig that is arranged as a backing for the joint during the friction stirring step. The backing jig K is a member longer than the metal plate 1 and has a curved surface portion K1 having an arcuate cross section on the upper surface. The curvature radius of the curved surface portion K1 may be appropriately set according to the curvature radius on the outer peripheral side of the manufactured cylindrical member, but is formed substantially equal to the curvature radius on the outer peripheral side of the manufactured cylindrical member. It is preferable.

  As shown in FIG. 2, the butting process is a process of forming a butting portion J <b> 1 by butting the end surfaces 1 a and 1 b of the metal plate 1 while rolling the metal plate 1. A member formed by rolling the metal plate 1 is referred to as a cylindrical member 1A. In the butting process, the backing jig K is disposed so as to contact the lower outer peripheral surface of the cylindrical member 1A, and the butting part J1 is positioned along the curved surface portion K1 of the backing jig K. . A gap S having a V-shaped cross section is unavoidably formed in the longitudinal direction in the butting portion J1, and the gap S is positioned along the curved surface portion K1. In addition, you may perform temporary joining with respect to the butt | matching part J1 by welding or friction stirring. By performing the temporary joining, it is possible to easily perform the friction stirring step and to prevent the opening of the butt portion J1.

  As shown in FIGS. 2 and 3, the auxiliary member arranging step is a step of arranging the auxiliary member 10 so as to cover the butt portion J <b> 1 on the inner peripheral surface of the cylindrical member 1 </ b> A. The auxiliary member 10 is a long plate-like member. The auxiliary member 10 is curved and formed with the same radius of curvature as the inner periphery of the cylindrical member 1A. The auxiliary member 10 may be made of a metal that can be frictionally stirred, but in the present embodiment, the auxiliary member 10 is formed of the same material as the cylindrical member 1A. By the auxiliary member arranging step, the back surface 10b of the auxiliary member 10 is in surface contact along the inner peripheral surface of the cylindrical member 1A. The plate | board thickness of the auxiliary member 10 is suitably set to such an extent that a metal shortage does not occur in the joint portion (plasticization region W) after the friction stirring step.

  As shown in FIG. 4, the tab material arranging step is a step of arranging the tab materials T and T at both ends of the butt portion J1. The tab material T is a short plate-like member formed in a curved shape, and is formed with the same plate thickness as the plate thickness of the cylindrical member 1A. The curvature radius of the tab material T is formed to be the same as the curvature radius of the cylindrical member 1A. The tab material T is formed of the same material as the cylindrical member 1A. In the tab material arranging step, the tab material T is arranged on the curved surface portion K1 of the backing jig K, and the end surface of the tab material T is brought into contact with the end surface of the cylindrical member 1A. The tab member T and the cylindrical member 1A are temporarily joined by welding or friction stirring. The surface of the tab member T and the inner peripheral surface of the cylindrical member 1A are flush with each other.

  As shown in FIG. 5, the friction stirring step is a step of performing friction stir welding from the inner peripheral surface of the cylindrical member 1 </ b> A to the butted portion J <b> 1 using the welding rotary tool F. 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 is tapered 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 the spiral groove of the stirring pin F2 in the clockwise direction from the proximal end toward the distal 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 outside the to-be-joined metal member (1A of cylindrical to-be-joined members and the auxiliary member 10) can be decreased. The spiral groove may be omitted. For example, the joining rotary tool F is attached to a robot arm having a rotation driving means such as a spindle unit at the tip. By attaching the joining rotary tool F to the tip of the robot arm, the joining rotary tool F can be relatively moved even in a narrow place such as the inside of the cylindrical member 1A.

  In the friction agitation step, the agitation pin F2 of the welding rotary tool F rotated to the right at the start position SP set on one of the tab members T is inserted and moved relatively to the auxiliary member 10 side. After entering the auxiliary member 10, the joining rotary tool F is relatively moved by tracing the butting portion J <b> 1 as it is. In the friction stirring step, as shown in FIG. 6, the connecting portion F1 is not brought into contact with the auxiliary member 10, and the friction stir welding is performed with the base end side of the stirring pin F2 exposed. The insertion depth of the stirring pin F2 may be set as appropriate, but is preferably set so that the entire depth direction of the butt portion J1 is friction stir welded. When the joining rotary tool F reaches the other tab member T, the joining rotary tool F is detached from the tab member T.

  As shown in FIG. 7, after the friction stirring step, a plasticized region W is formed along the movement locus of the welding rotary tool F. Further, burrs V are formed on the surface 10 a of the auxiliary member 10. When the friction stirring step is completed, the tab members T and T and the backing jig K are removed from the cylindrical member 1A.

  The removing step is a step of removing the auxiliary member 10 from the inner peripheral surface of the cylindrical member 1A. In the removing step, the auxiliary member 10 remaining on both sides of the plasticized region W is cut and bent. In the removal process, a cutting device or the like may be used, but in this embodiment, the removal process is performed manually.

  According to the manufacturing method of the cylindrical member according to this embodiment described above, the backing jig K provided with the curved surface portion K1 is arranged on the outer peripheral surface of the cylindrical member 1A to stir the butt portion J1. Since the friction stir welding is performed only by F2, the cross section of the cylindrical member can be made close to a circle. That is, since only the stirring pin F2 is inserted into the abutting portion J1 and friction stir welding is performed, it is not necessary to provide a flat end portion on the inner peripheral surface side of the cylindrical member to be joined. For this reason, the inner peripheral surface and outer peripheral surface of the cylindrical member after friction stir welding can be made close to a circle.

  In addition, a V-shaped gap S is formed in the butt portion J1 in the butt process, but the friction stir welding is performed in a state where the auxiliary member 10 is arranged on the inner peripheral surface of the cylindrical member 1A. It is possible to prevent the (plasticization region W) from becoming a metal shortage. Further, according to the present embodiment, the inner peripheral surface and the outer peripheral surface of the cylindrical member can be made close to a circular shape without increasing the thickness of both ends of the metal plate 1 or changing the shape of the end surfaces. .

  Further, in the friction stirring step, since only the stirring pin F2 is joined in contact with the cylindrical member 1A and the auxiliary member 10, the load on the friction stirring device can be reduced. Further, since the burr V is removed together with the auxiliary member 10 in the removing process, the burr V can be easily removed, and the inner peripheral surface of the cylindrical member can be finished cleanly without performing a separate burr cutting process. it can.

  Further, by performing the friction stir process using the tab materials T and T, the friction stir welding can be performed over the entire length of the butt portion J1. Further, by using the tab materials T and T, the start position and the end position of the welding rotary tool F can be easily set in the friction stirring process.

[Second Embodiment]
Next, the manufacturing method of the cylindrical member which concerns on 2nd embodiment of this invention is demonstrated. In the manufacturing method of the cylindrical member according to the second embodiment, the arrangement position of the auxiliary member 10 is mainly different from the first embodiment. In the method for manufacturing a cylindrical member according to the second embodiment, a preparation process, a butting process, an auxiliary member arranging process, a tab material arranging process, a friction stirring process, and a removing process are performed. In the second embodiment, the description will focus on the parts that are different from the first embodiment.

  Since the preparation process and the matching process are the same as those in the first embodiment, description thereof is omitted. As shown in FIG. 8, the auxiliary member arranging step is a step of arranging the auxiliary member 10 on the inner peripheral surface of the cylindrical member 1A. In the auxiliary member placement step, the contact areas between the back surface 10b of the auxiliary member 10 and the inner peripheral surface of the cylindrical joined member 1A are different from each other with the joining center line X (vertical line passing through the butted portion J1) as a boundary. To do. That is, in the auxiliary member arranging step, the contact area between the back surface 10b of the auxiliary member 10 and the inner peripheral surface of the cylindrical member 1A to be joined is one side as compared to the other side (left side from the joining center line X). Arrange so that becomes larger. In other words, in the auxiliary member arranging step, the end surface 10c of the auxiliary member 10 is arranged so as to slightly protrude with respect to the joining center line X to the other side (left side of the joining center line X). The distance from the joining center line X to the end face 10c of the auxiliary member 10 is such that no metal shortage occurs in the joining portion (plasticization region W) and the auxiliary member 10 remains on the other side after the friction stirring step described later. It is preferable to set it to such an extent that it does not occur. Since the tab member arranging step is the same as that in the first embodiment, the description thereof is omitted.

  In the friction stirring step, as shown in FIG. 9, the butt joint J1 is friction stir welded using the welding rotary tool F. In the friction stirring step, the welding rotation tool F rotated to the right is relatively moved so that the bonding center line X and the rotation center axis C of the bonding rotation tool F overlap. In the present embodiment, the bonding rotary tool F is relatively moved from the front side to the back side in FIG.

  That is, in this embodiment, 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 the other side (the left side of the connecting center line X). The movement direction and the rotation direction of the welding rotary tool F are set so that 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, many burrs V tend to be generated on the shear side outside the plasticized region W. 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 the burr V increases on the flow side outside the plasticizing region W because the rotational speed is fast. Tend to occur.

  In the present embodiment, since the rotational speed of the joining rotary tool F is set high, there is a tendency that many burrs V are generated on the flow side outside the plasticizing region W as shown in FIG. In other words, the burrs V can be concentrated on the auxiliary member 10 on one side (the side on which the auxiliary member 10 is in surface contact with the cylindrical member 1A with respect to the bonding center line X). 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 friction stirring step, which side of the traveling direction of the welding 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 (feeding speed) of the rotating tool F for joining, the inclination angle (taper angle) of the stirring pin F2, the material of the cylindrical joined member 1A and the auxiliary member 10, and auxiliary It is determined by each element such as the thickness of the member 10 and a combination of these elements. Depending on the joining conditions, the side where the burr V is generated or the side where a lot of burr V is generated is the side where the auxiliary member 10 is in surface contact with the cylindrical joined member 1A with respect to the joining center line X. If set, it is preferable because the removal step described later can be easily performed.

  The removing step is a step of removing the auxiliary member 10 from the inner peripheral surface of the cylindrical member 1A as shown in FIG. In the removing step, the auxiliary member 10 remaining on one side across the joining center line X is cut out so as to be bent. In the removal process, a cutting device or the like may be used, but in this embodiment, the removal process is performed manually.

  The manufacturing method of the cylindrical member according to the second embodiment can provide substantially the same effect as that of the first embodiment. Further, since the burrs V can be collected on the remaining auxiliary members 10 in the friction stirring step, the burrs V can be easily removed together with the auxiliary members 10 in the removal step. In the second embodiment, since the auxiliary member 10 is disposed so as to slightly protrude to the other side with respect to the bonding center line X, the bonding portion (plasticization region W) can be bonded with a good balance. In addition, since the auxiliary member 10 remaining only on one side with respect to the bonding center line X may be removed, the removing process can be performed more easily.

  Although the manufacturing method of the cylindrical member of the present invention has been described above, design changes can be made as appropriate without departing from the spirit of the present invention. For example, in the butting step, the end surfaces 1a and 1b may be cut obliquely so that the gap S having a V-shaped cross section is not formed when the end surfaces 1a and 1b are butted. Further, in the present embodiment, the auxiliary member 10 is arranged so that the auxiliary member 10 and the cylindrical member 1A are in contact with each other across the bonding center line X, but only on one side with respect to the bonding center line X. The auxiliary member 10 may be arranged so that the cylindrical member 1A and the auxiliary member 10 are in contact with each other. Further, the tab material arranging step may be omitted.

DESCRIPTION OF SYMBOLS 1 Metal plate 1A Cylindrical to-be-joined member 10 Auxiliary member F Joining rotary tool (rotary tool)
F1 connecting part F2 stirring pin J1 butt part K backing jig K1 curved surface part V burr W plasticizing region

Claims (4)

A method of manufacturing a cylindrical member using a rotary tool equipped with a stirring pin,
While rounding the metal plate to form a cylindrical member to be joined, the butting step of butting the end faces together to form a butting portion;
Auxiliary member arrangement in which a curved surface portion formed in a backing jig is arranged on the outer peripheral surface side of the abutting portion and an auxiliary member is arranged along the abutting portion on the inner peripheral surface of the cylindrical member to be joined Process,
The rotating tool is relatively moved along the abutting portion while the rotating stirring pin is inserted from the surface side of the auxiliary member and only the stirring pin is in contact with the cylindrical member to be joined and the auxiliary member. And a friction stir process for friction stir welding the butt portion.   The method for manufacturing a cylindrical member according to claim 1, further comprising a removing step of removing the auxiliary member on which the burr is formed from the cylindrical member to be joined.   3. The method for manufacturing a cylindrical member according to claim 2, wherein in the friction stirring step, a joining condition is set so that burrs generated in the friction stir welding are formed in the auxiliary member. In the auxiliary member arranging step, the auxiliary member is arranged on one side with the butting portion interposed therebetween, and is arranged so as to slightly protrude on the other side so that the auxiliary member does not remain on the other side after the friction stirring step. And
3. The method for manufacturing a cylindrical member according to claim 2, wherein in the friction stirring step, the joining condition is set so that burrs generated in the friction stir welding are formed in the auxiliary member on the one side. .

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