JP2007290036A - Backing jig for friction stir processing, and method for manufacturing product using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backing jig which is applied to the surface opposite to a surface of a workpiece in which a stirring tool is inserted, and is used to sustain a pressure by the stirring tool in friction stir processing and which is manufactured easily at a low cost even when processing a workpiece having a three-dimensional curved surface. <P>SOLUTION: The invented backing jig 10 for friction stir processing is composed of inorganic hardened compacts obtained by hardening a hardenable inorganic composition, particularly cement compacts. The backing jig having further strength can be obtained by reinforcing the cement compacts with fibers mixed dispersively into the cement compacts or with woven-fabric-reinforced or fiber-reinforced plastic layer formed in the cement compacts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the friction stir processing, the present invention uses a backing jig that is applied to the surface of the workpiece opposite to the surface on which the stirring tool is embedded and is used to support the pressing by the stirring tool, and the same. The present invention relates to a method of manufacturing a friction stir processed product.

  When joining materials to be joined such as an aluminum alloy plate, a rod-like joining rotary tool (with a large diameter shoulder portion and a high-diameter shoulder) is attached to one end of a joining line formed by abutting the joining surfaces of the materials to be joined together. Press the probe of a tool (made of hard tool steel etc. having a probe at its tip) with a strong force, plasticize the material to be joined by the generated frictional heat, insert the probe, and the shoulder part applies pressure to the material to be joined. This tool is moved along the joining line in a state where it is rubbed by rotating while being added, and the vicinity of the tool is plasticized by frictional heat generated by the rotation of the tool, and in a solid state, the joining surfaces of the materials to be joined The method of joining is called Friction Stir Welding (FSW) and is widely known (for example, Patent Document 1).

  According to the friction stir welding described above, the frictional heat between the tool and the material to be joined is used for joining, so that the highest temperature does not reach the melting point and the joining is performed in a solid state. There are advantages such as low strength reduction at joints, no joint defects such as pores and cracks, and flat joint surfaces, which have already been put to practical use in the fields of railway vehicles, ships, civil engineering structures, automobiles, etc. Yes.

  In friction stir welding, the tool is pressed with a strong force along the joining line of the material to be joined. Therefore, a large load is applied to the material to be joined by the pressing force of the tool, and the material to be joined is caused by this large load. Will be deformed, distorted, displaced, etc., the strength of the seam will be reduced, and problems such as poor appearance will occur, making it difficult to achieve good bonding. The pressure applied to the material to be joined varies depending on the material and thickness of the material to be joined, but when joining a material to be joined having an aluminum alloy thickness of about 3 to 6 mm, it is usually about 2,500 to 5,000 N. It is.

  For this reason, usually, a method of arranging and fixing a backing jig for restraining the bonded portion of the bonded material along the back side surface of the bonded portion of the bonded material is employed. This type of backing jig requires high rigidity so that it can withstand strong pressure from the shoulder of the tool in the normal direction and does not buckle. Generally, a hard steel backing jig is used. (For example, Patent Documents 2 and 3).

  However, in the case of a conventional steel backing jig, in the case of linear joining or simple two-dimensional curved joining, the jig shape can be a simple flat plate, so that the jig can be manufactured. There is no problem, but if the material to be joined has a three-dimensional curved surface and joins the joining line on the curved surface, just bending the plate-shaped steel material corresponding to the curved shape will serve as a backing. Insufficient strength is not possible because the material to be joined is deformed during processing. For this reason, a large steel block must be used, and the hard surface must be manufactured by cutting into a desired three-dimensional curved surface shape with a great deal of labor, resulting in a significant increase in manufacturing cost. is there.

  On the other hand, Friction Stir Processing (FSP), in which a rotating probe is embedded in the surface of a workpiece to modify the surface, is also widely known (for example, Patent Document 4). It is possible to improve the toughness, ductility, etc. by reducing the crystal grain size from the surface of the workpiece to a certain depth by plasticizing the shoulder of the tool and the workpiece near the probe by the generated frictional heat it can. If the workpiece is flat in the friction stir modification, it can be processed with a conventional jig. However, when the workpiece is a thin plate and has a three-dimensional shape, the backing jig has the same problem as the friction stir welding.

Furthermore, a point joining process has been developed in which the tool is pressed against the workpiece, but is pulled out after a certain time without being moved laterally.
Welding or Friction Spot Bonding
Joining). Even in this case, the backing jig has the same problem as that of ordinary friction stir welding.

Japanese Patent No. 2712838 JP-A-11-267858 JP 2005-20596 A JP 2003-64458 A

  The present invention has been made in view of the above problems, and its object is to push a rotating tool such as friction stir welding, friction stir reforming, or friction spot welding against a workpiece with a strong force. In friction stir processing, in which the workpiece is plasticized by the generated frictional heat and processed in a solid state, even if the processed portion of the workpiece has a three-dimensional curve or curved surface, A low-cost backing tool for friction stir processing and a friction stir work using the same can be manufactured in a short period of time without the need for any deformation of the material to be joined due to the applied pressure. It is to provide a manufacturing method.

The above object can be achieved by a friction stir processing backing jig having the following characteristics.
The friction stir processing backing jig according to claim 1 of the present invention is applied to the surface of the workpiece opposite to the surface where the stir tool is embedded in the friction stir processing, and is pressed by the stir tool. A backing jig used for supporting, comprising an inorganic cured product molded body obtained by curing a curable inorganic composition.

  The backing jig for friction stir processing according to claim 2 of the present invention is characterized in that, in claim 1, the inorganic cured product molded body is a cement molded body.

  The friction stir processing backing jig according to claim 3 of the present invention is the friction stir processing backing jig according to claim 1 or 2, wherein the inorganic cured product is made of woven fabric or fiber reinforced plastic. It is characterized by being reinforced by.

  The friction stir welding backing jig according to claim 4 of the present invention is the friction stir welding backing jig according to any one of claims 1 to 3, wherein the workpiece stirring tool is embedded. The backing jig surface applied to the surface opposite to the surface to be inserted is formed in a three-dimensional curved surface.

  The friction stir processing backing jig according to claim 5 of the present invention is the friction stir processing backing jig according to any one of claims 1 to 4, wherein the workpiece stirring tool is embedded. It is obtained by producing a curing mold having a surface opposite to the surface to be inserted as one surface of the mold, and injecting and curing a curable inorganic composition into the mold. .

  The friction stir welding backing jig according to claim 6 of the present invention is the friction stir welding backing jig according to claim 5, wherein the workpieces to be friction stir welded are temporarily fixed to each other at the joint and cured. It is used for producing a mold for use.

  According to a seventh aspect of the present invention, there is provided a friction stir processed product obtained by performing friction stir processing using the friction stir processing backing jig according to any one of the first to sixth aspects. It is a manufacturing method.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an example of a backing jig for friction stir processing according to the present invention. In FIG. 1, reference numeral 10 denotes a backing jig. The backing jig 10 has a semi-spherical three-dimensional curved surface portion 11 and a hemispherical three-dimensional shape that gently bulges from the curved surface portion 11. It consists of a cement molded body having a curved surface portion 12. Reference numeral 13 denotes a rib for fixing the end of the material to be joined to a surface plate or the like of the friction stirrer. A bolt hole or the like may be formed in this rib by embedding a nut or the like. Various fixing methods can be adopted as a method for fixing the materials to be joined, but such ribs may be omitted when fixing by other methods.

  The backing jig 10 can be obtained by curing and molding an inorganic curable composition. The material and curing method of the inorganic curable composition are not particularly limited, but are selected in consideration of strength, shape stability, heat resistance, and the like. As the material of the inorganic curable composition, an inorganic hydratable curable composition such as cement is particularly preferable because it can be easily cured. Further, for example, gypsum and ceramics (ceramic products using clay as a main material such as fired bricks and tiles) can be used by appropriately performing reinforcement or the like. Moreover, the shape of the backing jig 10 is not limited to the illustrated three-dimensional curved surface, and may be a desired shape according to the overall shape of the workpiece or the shape of the portion to be joined including the joining line. Molded. Further, the shape is not limited to a three-dimensional curved surface shape, and may be a flat plate-like simple shape used for linear joining or simple two-dimensional curved joining.

As the backing jig 10 made of such a cement molded body and the backing jig made of other inorganic cured product molded bodies, those having a compressive strength of approximately 100 N / mm ² or more are preferably used. If the compressive strength is insufficient, depending on the material and thickness of the material to be joined, it may not be able to withstand the strong pressure applied from the tool in the normal direction, and may crack or buckle. For example, it becomes difficult to perform good bonding.

  The backing jig 10 made of the above-mentioned cement molded body is obtained by using cement and mixing aggregates and the like with a conventional method, kneading with water, molding and curing. For example, portland cement, blast furnace cement, silica cement, fly ash cement, etc. and aggregates used in concrete such as fine sand, water and cement admixture (AE agent, water reducing agent, trade name Denka Σ2000, etc.) A curable inorganic water kneaded product obtained by kneading an appropriate amount of the agent) is formed into a desired shape, for example, a kamaboko-shaped three-dimensional curved surface shape shown in the figure and cured. The backing jig 10 made of the cement molded body thus obtained has a sufficient compressive strength. In addition, when exposed to high temperature at the time of friction stirring processing, it is preferable to use heat-resistant cement.

  In order to further improve the strength, the backing jig 10 made of the cement molded body is reinforced by dispersing a proper amount of short fibers and / or long fibers such as aramid fibers, carbon fibers, glass fibers, and polypropylene fibers. It is preferable to do this.

  The backing jig 10 made of the cement molded body has a woven fabric or fiber made of long fibers such as aramid long fibers, carbon long fibers, glass long fibers, and polypropylene long fibers in order to further improve the strength thereof. It is preferable to reinforce by placing at least one layer of reinforcing plastic (FRP) in layers. By installing such a woven fabric or fiber reinforced plastic (FRP) in layers, the compressive strength is improved. For installation, a fiber reinforced plastic layer may be formed in advance and adhered to the cement molded body, or may be adhered to the cement molded body in a prepreg state in which a woven fabric is impregnated with an epoxy resin or the like. The plastic layer may be placed by placing or embedding when the cement is uncured. The resin for fiber-reinforced plastic and the adhesive may be thermosetting, but are preferably two-component and room temperature curing.

In the present invention, it is preferable to arrange at least one layer of these woven fabrics or fiber reinforced plastics (FRP) in a layered manner on the side opposite to the surface of the backing jig in contact with the back surface of the workpiece. This is because a compressive force is applied to the side of the backing jig that contacts the workpiece.
By arranging in this way, the effect of preventing the strength of the backing jig from becoming higher than the softening temperature of the reinforcing woven fabric or FRP due to the heat transmitted from the workpiece to the friction stir processing. There is also.

  Next, an example of the manufacturing method of the backing jig 10 made of the above-mentioned cement molded body will be described. FIG. 2 is a schematic cross-sectional view for explaining an example of a manufacturing method of a friction stir welding backing jig used for friction stir welding as the friction stirring working backing jig shown in FIG. First, using the plate-like materials 21 and 22 having a three-dimensional curved surface to be joined, the joined portions of the plate-like materials 21 and 22 are abutted with each other at mutual positions to be joined (see FIG. In the middle, the butt portion of the materials to be joined 21 and 22 is indicated by reference numeral 23), and is temporarily fixed with an adhesive tape 32, etc. Assemble the mold 30 with the bottom face. In addition, it is preferable to affix the peelable removable adhesive film 33 to the materials 21 and 22 to facilitate mold separation from the cement molded body. Further, it is preferable that a peelable removable adhesive film 33 is attached to the surface of the materials to be bonded 21 and 22 opposite to the surface on which the cement comes into contact in order to prevent contamination, scratching, etc. due to sand described later.

  Here, since the plate-like materials 21 and 22 are usually about 3 to 6 mm in thickness and relatively thin, they may be displaced and cannot be set reliably. Also, a cement water paste 35 to be injected later is used. May be deformed with the weight of. In that case, it is preferable to temporarily reinforce the materials 21 and 22 by filling sand 34 or the like below the materials 21 and 22 to be bonded which become the bottom of the mold 30. Alternatively, a wooden mold or plastic mold having the same three-dimensional curved surface may be produced without using the plate-shaped workpieces 21 and 22, and this wooden mold or plastic mold may be used as the bottom of the mold 30.

  Thereafter, a hardened cement water kneaded product 35 obtained by kneading an appropriate amount of cement, aggregate, water, cement admixture, etc. is poured into the mold 30 and the surface is leveled. It dries and hardens | cures with humidity and time, Then, the to-be-joined materials 21 and 22 of the mold 30 and a bottom face are removed, and also it cures with appropriate temperature, humidity, and a period. Thus, a backing jig 10 made of a cement molded body having desired three-dimensional curved surface portions 11 and 12 as shown in FIG. 1 is obtained. To attach the backing jig to a surface plate or the like during friction stir processing, or to fix a fastener for fixing the object to be joined to the backing jig, for example, to form a bolt hole, The temporarily screwed nut may be provided by being embedded at the time of cement injection.

  When the cement molded body is reinforced with fibers, an appropriate amount of fibers may be mixed and dispersed in advance in the curable cement water paste 35. When the cement molded body is reinforced with woven fabric or fiber reinforced plastic (FRP), a fiber reinforced plastic layer may be formed in advance and adhered to the cement molded body, or an epoxy resin or the like may be attached to the woven fabric. It may be adhered to the cement molded body in a prepreg state impregnated with a fiber, or a fiber-reinforced plastic layer may be placed or embedded in a layer form when the cement is uncured.

  In this way, as shown in FIG. 1, the friction stir welding backing jig 10 of the present invention made of a cement molded body having desired three-dimensional curved surface portions 11 and 12 is obtained.

  Next, a method for performing friction stir welding using the friction stir welding backing jig 10 shown in FIG. 1 will be described. FIG. 3 is a perspective view for explaining an example of friction stir welding using the friction stir welding backing jig 10 shown in FIG.

  In FIG. 3, first, the above-described backing jig 10 is fixed to the surface plate of the friction stir welding apparatus, and two plate-like materials 21 and 22 having a three-dimensional curved surface are butted on the backing jig 10. It arrange | positions in the state which faced at the part 23, and it fixes with the fixing metal fitting 40 and the bolt 41. FIG. As a method for fixing the material to be bonded to the backing jig 10, other than the above method, a method of fastening with an appropriate fixing band may be employed. Moreover, it can also temporarily wear using a double-sided adhesive tape. In addition, if the plate-shaped to-be-joined materials 21 and 22 do not shift | deviate at the time of joining, it is not necessarily necessary to fix the to-be-joined materials 21 and 22 with a fixing tool.

  In the above example, the backing jig 10 having a shape larger than that of the materials to be joined 21 and 22 is used, and the entire back side surfaces of the materials to be joined 21 and 22 are in contact with a part of the surface of the backing jig 10. However, the backing jig 10 having the same size as the materials to be joined 21 and 22 may be used. The backing jig 10 should just exist in the back side surface of the to-be-joined materials 21 and 22 of the part containing the butt | matching part 23 formed at least by joining a joining surface mutually. In short, it is only necessary that the backing jig 10 exists in a necessary portion so that the materials 21 and 22 are not deformed, distorted, or displaced due to the strong pressing force of the tool during the bonding.

  After that, as shown in FIG. 3, a joining rotary tool 50 (a shoulder portion 52 having a large diameter and a probe at the tip thereof) A tool 50) made of hard tool steel 51 is pressed and inserted with a strong force while rotating the probe 51 at a high speed, and the tool 50 is moved along the butt 23 while applying pressure by the shoulder 52 to generate frictional heat. It is moved to the other end, and the vicinity of the tool is plasticized by frictional heat and joined in a solid state. It should be noted that the tool is inserted from the substantially normal direction of the surface in the vicinity of the joint portion of the material to be joined and is moved while maintaining the substantially normal direction.

  As the materials 21 and 22 to be joined, plate-like materials to be joined mainly made of an aluminum alloy, a magnesium alloy, a titanium alloy, or the like are used, but are not limited as long as they can be friction stir processed. These materials to be joined may be flat, simple plate-like or plate-like having a simple two-dimensional curved surface. However, the present invention particularly provides a backing having a three-dimensional curved surface. This is useful when a jig 10 is used to join a plate-shaped workpiece having a three-dimensional curved surface corresponding thereto.

  The joining rotary tool (tool) 50 has a shoulder portion 52 having a large diameter and a probe 51 at its tip, and is harder than the material of the materials 21 and 22 to be joined, such as SK or SKD tool steel such as SKD61 or PCBN. (polycrystalline cubic boron nitride) and the like. The probe 51 can be either one that is not threaded or one that is not threaded.

  Further, the surface of the shoulder portion 52 needs to press the materials 21 and 22 to be joined along the butt portion 23. Usually, the shoulder surface in contact with the material to be joined is a flat surface, or the one having a slightly conical shape with the probe 51 as the center is used. In some cases, the one having a slightly conical shape with the probe 51 as the center is used. Can also be used. The length of the probe 51 is usually about 0.2 mm shorter than the thickness of the materials 21 and 22 to be joined so as not to contact the backing jig 10. The rotation speed of the tool 50 is generally several hundred to several thousand rotations / minute, and the joining speed is generally several tens to several hundreds mm / minute, but may be 1 to 2 m / minute depending on conditions.

  The tool 50 includes, for example, a platen axis (X), a transverse axis (Y), a lifting axis (Z), three machine axes, a swing axis (A), and a swivel axis (C) as shown in FIG. It is used by being attached to a known 5-axis frame type friction stir welding apparatus comprising two tools. Further, it can be used by being attached to a machine head mounted at the tip of a known robot arm having three joint axes and two rotation axes, but is not limited thereto.

As a method of moving the tool 50 along the abutting portions 23 of the materials 21 and 22 having a three-dimensional curved surface shape, for example, a method in which the operation of the tool 50 is previously learned and stored in a computer and is performed by computer control. Although suitably adopted, it is not limited to this. Thus, a joined body of the materials 21 and 22 having a three-dimensional curved surface is obtained.
In the above description, the friction stir welding (FSW) has been described. However, the present invention can be similarly applied to friction stir reforming and friction spot welding.

  The backing jig for friction stir processing of the present invention comprises an inorganic cured product molded body obtained by curing a curable inorganic composition, particularly a cement molded body. Such a cured molded body is, for example, three-dimensional. Assembling a formwork with the back side of the material to be joined having a curved surface, and pouring a curable inorganic composition, especially cement, fine sand, water and various cement admixtures into the formwork Since it can be obtained simply by hardening and then curing, it is extremely easy to manufacture, and cutting the surface of a steel block with a large wall thickness into a three-dimensional solid curved surface as in the past. There is an advantage that a backing jig having a three-dimensional curved surface can be easily manufactured at a low cost in a short period of time without the need for processing. It is particularly useful as a simple backing jig for high-mix low-volume production.

  In addition, the obtained inorganic cured product molded body, in particular, the cement molded body, has heat resistance and high strength, and can sufficiently withstand the strong welding pressure from the normal direction received from the tool of the friction stir welding apparatus. No cracking or buckling. Further, a friction stir welding backing jig comprising a cement molded body reinforced by dispersing and containing fibers and a cement molded body reinforced by placing at least one layer of woven fabric or fiber reinforced plastic in a layer form, , Have higher strength.

  Therefore, when the friction stir processing of a plate-shaped workpiece having a three-dimensional curved surface such as an aluminum alloy, a magnesium alloy, a titanium alloy, or the like is performed using the friction stir processing backing jig of the present invention. As with conventional hard steel backing jigs and hard steel backing jigs obtained by cutting a steel block, it is sufficient for the processing pressure received from the tool of the friction stir welding equipment. Therefore, the work material is not deformed and good friction stir processing can be performed.

  Specific examples of the present invention will be given below. The present invention is not limited to these examples.

(Production of backing jig)
Water was mixed at a ratio of 240 cc to 1.8 kg of “super strength concrete repair material” manufactured by Home Chemical Industry Co., Ltd., in which aggregate was previously mixed with cement to prepare a water kneaded product.

  A backing jig made of a thick plate-like cement molded body (width 17 cm, length 21 cm, thickness 2 cm) was prepared using the above-mentioned cement water paste. The backing jig was used for the friction stir welding test after curing.

(Friction stir welding)
Two pieces of materials to be joined made of rectangular aluminum alloy plates (A6061 T6) having a thickness of 3 mm, a width of 14 cm, and a length of 18 cm are brought into contact with each other and placed on a backing jig made of the cement molded body in this state. The material to be joined was fixed with a fixing bracket so that the material to be joined was not displaced.

  Next, in a friction stir welding apparatus having an X axis, a Y axis, and a Z axis, the tool made of tool steel is rotated at 1800 rpm and moved from one end to the other along the butt portion at a feed rate of 400 mm / min. Then, friction stir welding was performed to prepare a joined body. The applied pressure of the tool was 4,700N. No abnormalities such as cracks were found in the backing jig.

  No deformation was observed in the joined body obtained by the friction stir welding.

  In Example 1, about 0.076% by weight of an aramid short fiber (“AK-40 / 40” manufactured by Fivex Corporation) was further mixed to produce a backing jig. Then, friction stir welding was performed using the obtained backing jig to produce a joined body. No abnormality such as cracking was observed in the backing jig, and no deformation was observed in the joined body.

(Production of backing jig)
A prepreg obtained by impregnating a woven fabric made of aramid long fibers with epoxy resin (“E-810LS” manufactured by Konishi Co., Ltd.) on one side of a thick plate-like cement molded body obtained in the same manner as in Example 1 was placed. Then, a backing jig made of a fiber-reinforced plastic reinforced cement molding was produced by curing at room temperature. The backing jig was used for the friction stir welding test after curing.

(Friction stir welding)
The material to be joined was placed on the surface opposite to the exposed surface of the FRP on the backing jig, and friction stir welding was performed in the same manner as in Example 1. No deformation was observed in the bonding material obtained by friction stir welding.

(Production of backing jig)
In Example 1, a fiber reinforced plastic (FRP) obtained by impregnating a woven fabric made of aramid long fibers with epoxy resin (“E-810LS” manufactured by Konishi Co., Ltd.) and curing at room temperature when producing a backing jig. The layer was embedded in the middle of the cement layer, and the cement was cured to produce a backing jig. The backing jig was used for the friction stir welding test after curing.

(Friction stir welding)
A material to be joined was placed on the backing jig and friction stir welding was performed in the same manner as in Example 1. No deformation was observed in the bonding material obtained by friction stir welding.

(Production of backing jig)
A prepreg obtained by impregnating a woven fabric made of aramid long fibers with epoxy resin (“E-810LS” manufactured by Konishi Co., Ltd.) on one side of a thick plate-like cement molded body obtained in the same manner as in Example 1 was placed. Then, it is cured at room temperature and a backing jig made of a fiber reinforced plastic reinforced cement molded body is produced, and then a fiber reinforced plastic layer is similarly produced on the other side of the cement molded body, thereby reinforcing both sides. A backing jig made of a fiber-reinforced plastic-reinforced cement molded body was produced. The backing jig was used for the friction stir welding test after curing.

(Friction stir welding)
Friction stir welding was performed in the same manner as in Example 1 except that the backing jig was used, and a joined body was produced. No deformation was observed in the bonding material obtained by friction stir welding.

(Production of backing jig)

(Workpiece production)
An aluminum (6061Al) plate having a long side of 285 mm, a short side of 150 mm, and a plate thickness of 3 mm was bent so as to form an arc having a curvature radius (inner diameter) of 150 mm parallel to the short side to obtain a workpiece having a cylindrical side-like shape. .
(Curing mold production)
With a removable film attached to both sides of the workpiece, a curable mold with a rectangular parallelepiped shape with a dimension that fits the workpiece exactly, with the convex surface of the workpiece facing down, is produced by combining transparent plastic plates did.
(Production of backing jig)

  As shown in FIG. 5, with the work placed in a curing mold, alumina cement (DRYSIC-85 castable) dissolved in water was poured and cured to a depth of about 100 mm. At this time, the nut for attaching the workpiece to the backing jig with the bolt and the nut for attaching the backing jig to the surface plate with the bolt were hardened in a state of being embedded in advance. After curing, the curable mold, the removable film, and the workpiece were removed to obtain a back jig having a cross-sectionally kamaboko shape having a fixing nut length of 240 mm, a width of 150 mm, and a height of 100 mm. A photograph of the completed backing jig is shown in FIG. In FIG. 6, two backing jigs are shown, and bolts are inserted into some nut holes in order to show that bolt nuts are respectively embedded.

(Attaching the backing jig to the surface plate)
The backing jig was fixed with bolts to a fixing plate provided with screw through holes corresponding to the positions of the nut holes embedded in the planar bottom of the backing jig. Next, the fixing plate on which the backing jig was fixed was fixed to the platen of the three-dimensional friction stir welding apparatus shown in FIG. 4 with the jig.

(Attaching the workpiece to the backing jig)
A cylindrical material obtained by bending an aluminum (6061Al) plate made of the same material as the workpiece and having a long side of 285 mm, a short side of 200 mm, and a plate thickness of 3 mm so as to form an arc having a curvature radius (inner diameter) of 150 mm parallel to the short side. Bolt holes were drilled in positions corresponding to the positions of the nut holes embedded in the kamaboko-shaped curved surface of the backing jig in the side-like workpiece.
A work having a bolt hole was placed on the backing jig fixed to the surface plate and fixed with a bolt. FIG. 7 shows the state.

(Friction stir processing 1)
A tool steel tool with a shoulder diameter of 12 mm, a probe diameter of 4 mm, and a probe length of 2.9 mm and a screwed probe is attached to a three-dimensional friction stirrer while rotating the tool at 1,800 rpm with a pressure of 4,900 N Friction stir processing was performed by moving in an arc along a curved surface parallel to the long side direction of the workpiece at a feed rate of 400 mm / min.

(Friction stir processing 2)
A tool steel tool with a shoulder diameter of 12 mm, a probe diameter of 4 mm, and a probe length of 2.9 mm and a screwed probe is attached to a three-dimensional friction stirrer while rotating the tool at 1,500 rpm with a pressure of 3,900 N The friction stir processing was performed by moving in an arc along the curved surface parallel to the long side direction of the workpiece at a feed rate of 600 mm / min in parallel with the locus of the friction stir processing 1.

(Result of friction stir processing)
The workpieces subjected to the friction stir processing 1 and the friction stir processing 2 were removed from the backing jig and visually observed. No cracking or buckling of the backing jig due to friction stir processing was observed.

It is a perspective view which shows an example of the backing jig | tool for friction stirring process of this invention. It is a schematic cross section for demonstrating an example of the manufacturing method of the backing jig | tool for friction stir welding. It is a perspective view for demonstrating an example of the friction stir welding using the backing jig | tool for friction stir welding. It is a perspective view which shows an example of a three-dimensional friction stir processing apparatus. 6 is a photographic drawing substitute photograph using a workpiece in Example 5. FIG. 6 is a drawing-substituting photograph of a friction stirring working backing jig obtained in Example 5. FIG. It is a drawing substitute photograph showing the state of attachment of the backing jig to the surface plate and attachment of the workpiece in Example 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Backing jig | tool 11 Three-dimensional curved surface part of backing jig | tool 12 Three-dimensional curved surface part of backing jig | tool 13 Rib 21 To-be-joined material 22 To-be-joined material 23 Butt part of to-be-joined material 30 Formwork 32 Adhesive tape 33 Removable Adhesive film 34 Sand 35 Cement water paste 40 Fixing bracket 41 Bolt 50 Tool 51 Tool probe 52 Tool shoulder

Claims (7)

  In friction stir processing, a backing jig that is applied to the surface of the workpiece opposite to the surface on which the stir tool is embedded and is used to support pressing by the stir tool, and is a curable inorganic composition A backing jig for friction stir processing, characterized in that it comprises an inorganic cured product molded body obtained by curing.   The backing jig for friction stir processing according to claim 1, wherein the inorganic cured product formed body is a cement formed body.   The backing jig for friction stir processing according to claim 1 or 2, wherein the inorganic cured product molded body is reinforced with a woven fabric or a fiber reinforced plastic.   The backing jig | tool surface applied to the surface on the opposite side to the surface where the stirring tool of the workpiece is embedded is formed in the shape of a three-dimensional curved surface. The backing jig for friction stir processing according to item 1.   It was obtained by making a curing mold with one surface of the mold opposite to the surface where the stirring tool of the work material was embedded, and injecting and curing a curable inorganic composition into the mold. The backing jig for friction stir processing according to any one of claims 1 to 4, wherein the jig is for friction stir processing.   6. The backing jig for friction stir processing according to claim 5, wherein materials to be joined to be friction stir bonded are temporarily fixed to each other at a joint portion and used for producing a curing mold. A method for producing a friction stir product, wherein the friction stir processing is performed using the backing jig for friction stir processing according to any one of claims 1 to 6.