JP2021171816A - Friction stir processing tool and flange molding method - Google Patents

Abstract

To provide a friction stir processing tool and a flange molding method, which enable a flange in a shape suitable for positioning to be arranged at an arbitrary position.SOLUTION: The friction stir processing tool comprises: a rotating tool 11 that friction-stirs a work-piece 1 along a movement direction X; and a contact block 31 that has an insertion hole 33 through which the rotating tool 11 is inserted and is contacted with a processed surface 3 of the work-piece 1 and moved in the movement direction X together with the rotating tool 11. The rotating tool 11 has a small-diameter pin part 15 provided at a tip, and a shoulder part 21, provided at a root of the pin part 15, which feeds out a plastic flowing object of the work-piece 1, which is friction-stirred by the pin part 15 to plastically flow, toward an outer periphery side. The contact block 31 has a contact surface 41 that is contacted with the work-piece 1, and one flange molding groove 43, formed on the contact surface 41, which communicates with one place in a circumferential direction of the insertion hole 33 and extended in a tangential direction toward a front side in a rotation direction A of the rotating tool 11.SELECTED DRAWING: Figure 5

Description

The present invention relates to a friction stir welding tool and a flange forming method.

An assembly produced by joining structural members such as plate materials and extruded materials is assembled by joining the structural members by welding or the like. In this way, when the structural members are joined to each other to produce an assembly, the cut ends of the structural members are joined as a joint portion, so that the structural members can be joined with high accuracy. However, considering the degree of freedom in the design of the assembly, there is a requirement to join other structural members not only to the end portion of the structural member but also to the surface portion of the structural member. In this case, a flange for positioning is provided on the surface portion of the structural member. It is desirable to mold.

Patent Document 1 describes a tool for forming a convex portion such as a flange on the surface of a structural member by softening and plastically flowing the work which is a structural member by frictional heat to form the convex portion on the work. There is. Further, Patent Document 2 describes a tool for adjusting the shape of burrs generated by processing by the ridge forming groove of the burr forming member when joining the structural members to each other.

Japanese Unexamined Patent Publication No. 2013-252541 JP-A-2009-190040

In the technique described in Patent Document 1, a material that flows by friction stir welding with a rotary tool is placed between a recessed portion formed at the rear of the rotary tool and a convex portion formed at the side of the rotary tool. It is poured to form a convex portion. As described above, in the technique described in Patent Document 1, since the recessed portion forming portion is arranged behind the rotary tool, for example, the flange (convex portion) cannot be formed at the central portion of the face plate.

The technique described in Patent Document 2 forms burrs generated by processing as ridges that do not have a sharp shape, and eliminates the need for a separate deburring operation, and serves as a flange for positioning structural members. It's not a thing. Further, in the burr forming member, the burr is formed into a convex shape by two convex forming grooves arranged on both sides of the rotating member, and one of the convex forming grooves is the rotation direction (tangential direction) of the rotating member. ) And the tool moving direction are the same as the advancing side, so it is not possible to form a ridge with a shape that can be used as a positioning flange. Further, since the tool is moved while the stopper portion provided on the burr forming member is in contact with the edge portion of the structural member, the position where the tool can be processed is limited to the vicinity of the edge portion.

The present invention solves the above problems and provides a friction stir welding tool and a flange forming method capable of providing a flange having a shape suitable for positioning at an arbitrary position.

The present invention has the following configuration.
(1) A rotary tool that frictionally stirs the work piece along the moving direction by being pressed by a work surface made of the surface of the work piece and moving along the work surface.
A contact block having an insertion hole through which the rotation tool is inserted, abutting against the machined surface of the work piece, and being moved in the moving direction together with the rotation tool.
With
The rotation tool
With a small diameter pin provided at the tip,
A shoulder portion provided at the base of the pin portion, and a shoulder portion that sends out the plastic fluid of the workpiece to be plastically flowed by friction stir welding by the pin portion to the outer peripheral side.
Have,
The contact block is
The contact surface that comes into contact with the work piece,
A flange forming groove formed on the contact surface, communicating with one place in the circumferential direction of the insertion hole and extending in a tangential direction toward the front side in the rotation direction of the rotation tool.
Have,
Friction stirring tool.
(2) A flange forming method for forming a flange on the processed surface of the workpiece using the friction stir welding tool of the above (1).
The rotation tool is rotated so that the extending direction of the flange forming groove is a tangential direction toward the front side in the rotation direction.
The rotated tool is pressed against the work piece so that the pin portion bites into the work piece.
The contact surface of the contact block is brought into contact with the machined surface of the work piece,
The friction stir welding tool is moved to the workpiece in a direction opposite to the extending direction of the flange forming groove.
Flange forming method.

According to the friction stir welding tool and the flange forming method of the present invention, a flange having a shape suitable for positioning can be provided at an arbitrary position.

It is a perspective view which shows the state which the flange is formed by the friction stir welding tool which concerns on this embodiment. It is a perspective view of the state which the friction stirring processing tool is separated from the work. It is a perspective view of the friction stirring processing tool. It is an exploded perspective view of the friction stirring processing tool. It is a perspective view seen from the tip side of the friction stirring processing tool. It is sectional drawing which follows the axial direction of the friction stirring processing tool. It is a perspective view seen from above of a pressing block. It is a perspective view seen from the lower side of a pressing block. It is a top view of the pressing block. It is a back view of the pressing block. It is a perspective view explaining the example of joining structural members with each other using a flange.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a state in which a flange is formed by the friction stir welding tool according to the present embodiment. FIG. 2 is a perspective view of a state in which the friction stirring processing tool is separated from the work.

As shown in FIGS. 1 and 2, the friction stirring tool 100 according to the present embodiment is a tool that performs friction stirring processing on the work 1 which is a workpiece. This friction stirring processing tool 100 is used by being mounted on a friction stirring processing device (not shown). The friction agitation processing tool 100 includes a rotation tool 11 and a contact block 31. In this example, the work 1 is a metal plate material such as aluminum or an aluminum alloy, and the friction stir welding tool 100 processes the machined surface 3 which is the surface of the work 1. Specifically, the friction stir welding tool 100 forms a flange 5 along the moving direction X on the machined surface 3 of the work 1 by friction stir welding. The flange 5 is formed along the reforming portion 7 that has been frictionally agitated by the rotating tool 11.

FIG. 3 is a perspective view of the friction stirring processing tool. FIG. 4 is an exploded perspective view of the friction stirring processing tool. FIG. 5 is a perspective view seen from the tip side of the friction stirring processing tool. FIG. 6 is a cross-sectional view taken along the axial direction of the friction stirring processing tool.

As shown in FIGS. 3 to 6, the rotation tool 11 is formed in a rod shape and is rotated in the rotation direction A which is one direction (see FIG. 5). The rotation tool 11 has a main body portion 13 and a small-diameter pin portion 15 formed at the tip of the main body portion 13. A spiral protrusion 17 is formed on the outer periphery of the pin portion 15. The spiral protrusion 17 is formed in a spiral shape in a direction that advances toward the rear end side in the axial direction of the rotation tool 11 when the rotation tool 11 rotates in the rotation direction A.

Further, the rotation tool 11 has a shoulder portion 21 at the root portion of the pin portion 15 having a small diameter. The shoulder portion 21 is formed to have a smaller diameter than the main body portion 13, and is formed to have a larger diameter than the pin portion 15. The surface of the shoulder portion 21 between the shoulder portion 21 and the pin portion 15 is gradually inclined outward from the pin portion 15 toward the tip end side. As a result, a recess is formed in the shoulder portion 21 at the root portion of the pin portion 15, and this recess is used as the holding recess 23. The holding recess 23 may be provided by projecting an outer edge portion on the surface of the shoulder portion 21 between the pin portion 15 and forming a recess at the root portion of the pin portion 15.

FIG. 7 is a perspective view seen from above of the pressing block. FIG. 8 is a perspective view seen from below the pressing block. FIG. 9 is a plan view of the pressing block. FIG. 10 is a back view of the pressing block.

As shown in FIGS. 7 to 10, the contact block 31 is formed in a substantially cubic shape. The contact block 31 has an insertion hole 33 penetrating the front and back surfaces. The rotation tool 11 is inserted into the insertion hole 33 from the upper side of the contact block 31. An annular locking portion 35 is formed in the insertion hole 33 at the lower edge so as to project in an annular shape in the inner peripheral direction. The inner diameter of the annular locking portion 35 is slightly larger than the outer diameter of the shoulder portion 21 of the rotating tool 11.

The lower surface of the contact block 31 is a contact surface 41, and the contact surface 41 is brought into contact with the machined surface 3 of the work 1 when the work 1 is machined. In the contact block 31, one flange forming groove 43 is formed on the contact surface 41. The flange forming groove 43 is formed in a straight line. One end of the flange forming groove 43 communicates with one place in the circumferential direction of the insertion hole 33, and the other end reaches one side surface of the contact block 31. The flange forming groove 43 extends in a tangential direction toward the front side of the rotation direction A of the rotation tool 11 (see FIG. 5). Then, by communicating the flange forming groove 43 with the insertion hole 33, a notch 37 is formed in the annular locking portion 35 at one place in the circumferential direction.

In the rotary tool 11 inserted into the insertion hole 33 of the contact block 31 from above, the shoulder portion 21 is passed through the inner peripheral side of the annular locking portion 35, and the step between the main body portion 13 and the shoulder portion 21. The portion is locked to the annular locking portion 35. As a result, the rotation tool 11 is arranged in a state in which a part of the pin portion 15 and the shoulder portion 21 protrudes from the contact surface 41 of the contact block 31. The contact block 31 is fixed to the friction stirring processing apparatus by a fixing means (not shown). As a result, in the friction stirring processing tool 100, only the rotation tool 11 is rotated in the rotation direction A with respect to the fixed contact block 31.

Next, a case where the flange 5 is formed on the machined surface 3 of the work 1 by the friction stir welding tool 100 having the above configuration will be described.

The rotation tool 11 is rotated so that the extending direction of the flange forming groove 43 is a tangential direction toward the front side of the rotation direction A.

Next, the friction stirring processing tool 100 is moved toward the processing surface 3 of the work 1, and the rotated rotary tool 11 is pressed against the processing surface 3 of the work 1. As a result, the pin portion 15 of the rotation tool 11 is made to bite into the work 1, and the contact surface 41 of the contact block 31 is brought into contact with the machined surface 3 of the work 1.

In this state, the friction stir welding tool 100 is moved with respect to the work 1 in the moving direction X, which is the direction opposite to the extending direction of the flange forming groove 43 (see FIG. 1).

Then, the work 1 is rubbed and agitated by the pin portion 15 of the rotated rotation tool 11, and a plastic flow is generated. The plastic fluid of the work 1 that plastically flows is temporarily held by the holding recess 23 of the shoulder portion 21 of the rotary tool 11 and sent out to the outer circumference. The plastic fluid sent out to the outer peripheral side is sent from the notch 37 of the annular locking portion 35 to one flange forming groove 43 extending in the tangential direction toward the front side of the rotation direction A of the rotation tool 11. Is done. As a result, on the machined surface 3 of the work 1, one flange 5 protruding along the reforming portion 7 frictionally agitated by the rotary tool 11 is placed on the retreating side by the flange forming groove 43 of the contact block 31. It is molded (see FIG. 1). At this time, the plastic fluid of the work 1 generated by the rotation of the pin portion 15 tends to flow to the retreating side rather than the advancing side. Therefore, by processing the flange forming groove 43 as the retreating side, a reasonably good shape can be obtained. Flange 5 can be smoothly formed.

Here, an example of joining structural members using the formed flange 5 will be described.
FIG. 11 is a perspective view illustrating an example of joining structural members using a flange.
As shown in FIG. 11, when the structural members 1A and 1B are joined, the two flanges 5 are formed on the structural member 1A at intervals by the friction stir welding tool 100 with the joint surface as the machined surface 3. Then, the end portion of the structural member 1B is fitted between the two flanges 5 formed on the joint surface of the structural member 1A. As a result, the structural member 1B is positioned by the flange 5 with respect to the joint surface of the structural member 1A. Therefore, by subsequently joining the structural member 1B to the structural member 1A by welding or the like, the structural members 1A and 1B can be joined in a state of being positioned with each other with high accuracy.

As described above, according to the friction stirring processing tool and the flange forming method according to the present embodiment, the rotated rotary tool 11 is pressed against the processing surface 3 from the direction intersecting the processing surface 3 of the work 1. The contact surface 41 of the contact block 31 is brought into contact with the machined surface 3 of the work 1, and is moved along the machined surface 3 in this state. As a result, the plastic fluid of the work 1 that has been plastically fluidized by the pin portion 15 of the rotary tool 11 is sent into one flange forming groove 43 to form the flange 5 on the retreating side.

Therefore, for example, a flange 5 having a shape suitable for positioning can be easily formed at an arbitrary position in the central portion of the face plate. As a result, the flange 5 can be formed on the face plate, and other structural members can be positioned and joined by the flange 5, to produce an assembly, and the degree of freedom in designing the assembly can be increased.

Further, the rotation tool 11 is formed with a spiral protrusion 17 on the outer circumference of the pin portion 15. Therefore, the spiral protrusion 17 allows the plastic fluid to flow more satisfactorily, and the flange 5 can be formed more smoothly in the flange forming groove 43. That is, when the direction of the spiral of the spiral protrusion 17 is rotated counterclockwise on the base end side of the rotation tool 11, the spiral protrusion 17 (the groove between the adjacent spiral protrusions 17) becomes the axis of the pin portion 15. By making the direction forward toward the rear end side, when the rotation tool 11 rotates in the rotation direction A shown in FIG. 5, the plastic fluid of the work 1 in the semi-molten state is plastically flowed upward. , Can be smoothly sent to the flange forming groove 43.

Moreover, the rotary tool 11 has a holding recess 23 for holding the plastic fluid in the shoulder portion 21. As a result, the plastic fluid of the work 1 plastically fluidized by the pin portion 15 is temporarily held by the holding recess 23 of the shoulder portion 21 and sent out to the flange forming groove 43. Therefore, the plastic fluid can be stably sent out to the flange forming groove 43, and the flange 5 having a uniform shape in the longitudinal direction can be formed on the machined surface 3 of the work 1.

As described above, the present invention is not limited to the above-described embodiment, and can be modified or applied by those skilled in the art based on the combination of the configurations of the embodiments with each other, the description of the specification, and the well-known technique. This is also the subject of the present invention and is included in the scope for which protection is sought.

As described above, the following matters are disclosed in this specification.
(1) A rotary tool that frictionally stirs the work piece along the moving direction by being pressed by a work surface made of the surface of the work piece and moving along the work surface.
A contact block having an insertion hole through which the rotation tool is inserted, abutting against the machined surface of the work piece, and being moved in the moving direction together with the rotation tool.
With
The rotation tool
With a small diameter pin provided at the tip,
A shoulder portion provided at the base of the pin portion, and a shoulder portion that sends out the plastic fluid of the workpiece to be plastically flowed by friction stir welding by the pin portion to the outer peripheral side.
Have,
The contact block is
The contact surface that comes into contact with the work piece,
A flange forming groove formed on the contact surface, communicating with one place in the circumferential direction of the insertion hole and extending in a tangential direction toward the front side in the rotation direction of the rotation tool.
Have,
Friction stirring tool.

According to this friction stirring tool, the contact surface of the contact block is brought into contact with the machined surface of the workpiece so that the extending direction of the flange forming groove is the tangential direction toward the front side in the rotation direction. Is rotated, and the rotated rotation tool is pressed against the work piece so that the pin portion bites into the work piece. Then, the friction stir welding tool is moved to the workpiece in the direction opposite to the extending direction of the flange forming groove. Then, the plastic fluid of the work piece that is frictionally agitated by the pin portion of the rotary tool and plastically flows is sent out to the outer peripheral side by the shoulder portion of the rotary tool. The plastic fluid sent out to the outer peripheral side communicates with one place in the circumferential direction of the insertion hole and is sent to one flange forming groove extending in the tangential direction toward the front side in the rotation direction of the rotation tool. The flange forming groove forms a flange that protrudes along the moving direction of the friction stir welding tool.
As described above, according to the friction stirring processing tool of the present invention, the rotated rotary tool is pressed against the machined surface from the direction intersecting the machined surface of the work piece, and the block abuts on the machined surface of the work piece. The contact surface is brought into contact with the surface, and in this state, the contact surface is moved along the machined surface. As a result, the plastic fluid of the workpiece that has been plastically fluidized by the pin portion of the rotary tool is sent to one flange forming groove to form the flange on the retreating side.
Therefore, for example, a flange having a shape suitable for positioning can be easily formed at an arbitrary position in the central portion of the face plate. As a result, a flange can be formed on the face plate, and other structural members can be positioned and joined by the flange to produce an assembly, which can increase the degree of freedom in designing the assembly.

(2) The friction agitation processing tool according to (1), wherein the rotary tool has a spiral protrusion formed on the outer periphery of the pin portion.

According to this friction stir welding tool, the plastic fluid can be flowed better by the spiral protrusion, and the flange can be formed more smoothly in the flange forming groove.

(3) The friction stir welding tool according to (1) or (2), wherein the rotary tool has a holding recess for holding the plastic fluid in the shoulder portion.

According to this friction stir welding tool, the plastic fluid of the workpiece plastically fluidized by the pin portion is temporarily held by the holding recess of the shoulder portion and sent out to the flange forming groove. Therefore, the plastic fluid can be stably sent out to the flange forming groove, and a flange having a uniform shape in the longitudinal direction can be formed on the machined surface of the workpiece.

(4) The holding recess is formed so that the surface between the shoulder portion and the pin portion gradually inclines outward from the pin portion in the radial direction toward the tip side, according to (3). The described friction agitation processing tool.

According to this friction stirring tool, a dent is formed at the root portion of the pin portion, and this dent serves as a holding recess to define a space for temporarily holding the plastic fluid.

(5) A flange forming method for forming a flange on the processed surface of the workpiece using the friction stir welding tool according to any one of (1) to (4).
The rotation tool is rotated so that the extending direction of the flange forming groove is a tangential direction toward the front side in the rotation direction.
The rotated tool is pressed against the work piece so that the pin portion bites into the work piece.
The contact surface of the contact block is brought into contact with the machined surface of the work piece,
The friction stir welding tool is moved to the workpiece in a direction opposite to the extending direction of the flange forming groove.
Flange forming method.

According to this ridge forming method, the rotated rotary tool is pressed against the machined surface from the direction intersecting the machined surface of the work piece, and the contact surface of the contact block is brought into contact with the machined surface of the work piece. And move along the machined surface in this state. As a result, the plastic fluid of the workpiece that has been plastically fluidized can be sent into one flange forming groove to form a flange on the retreating side.
Therefore, for example, a flange having a shape suitable for positioning can be easily formed at an arbitrary position in the central portion of the face plate. As a result, a flange can be formed on the face plate, and other structural members can be positioned and joined by the flange to produce an assembly, which can increase the degree of freedom in designing the assembly.

1 Work (workpiece)
3 Machining surface 5 Flange 11 Rotating tool 15 Pin part 17 Spiral protrusion 21 Shoulder part 23 Holding recess 31 Abutment block 33 Insertion hole 41 Abutment surface 43 Flange forming groove 100 Friction stirring processing tool A Rotation direction X Movement direction

Claims (5)

A rotary tool that frictionally stirs the workpiece along the moving direction by being pressed against the workpiece made of the surface of the workpiece and moving along the workpiece.
A contact block having an insertion hole through which the rotation tool is inserted, abutting against the machined surface of the work piece, and being moved in the moving direction together with the rotation tool.
With
The rotation tool
With a small diameter pin provided at the tip,
A shoulder portion provided at the base of the pin portion, and a shoulder portion that sends out the plastic fluid of the workpiece to be plastically flowed by friction stir welding by the pin portion to the outer peripheral side.
Have,
The contact block is
The contact surface that comes into contact with the work piece,
A flange forming groove formed on the contact surface, communicating with one place in the circumferential direction of the insertion hole and extending in a tangential direction toward the front side in the rotation direction of the rotation tool.
Have,
Friction stirring tool. The rotation tool has a spiral protrusion formed on the outer periphery of the pin portion.
The friction stirring processing tool according to claim 1. The rotary tool has a holding recess in the shoulder portion that holds the plastic fluid.
The friction stirring tool according to claim 1 or 2. The holding recess is formed so that the surface between the shoulder portion and the pin portion gradually inclines outward from the pin portion in the radial direction toward the tip end side.
The friction stirring processing tool according to claim 3. A flange forming method for forming a flange on the machined surface of the work piece by using the friction stir welding tool according to any one of claims 1 to 4.
The rotation tool is rotated so that the extending direction of the flange forming groove is a tangential direction toward the front side in the rotation direction.
The rotated tool is pressed against the work piece so that the pin portion bites into the work piece.
The contact surface of the contact block is brought into contact with the machined surface of the work piece,
The friction stir welding tool is moved to the workpiece in a direction opposite to the extending direction of the flange forming groove.
Flange forming method.

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