JP5492235B2 - Double skin panel assembly and friction stir welding method for double skin panel - Google Patents

Description

  The present invention relates to an assembly of a double skin panel and a friction stir welding method for the double skin panel.

  A double skin panel formed by stacking two metal plates is used as a structure of a railway vehicle, an aircraft, a ship, a civil engineering building structure or the like. For example, as described in Patent Document 1, the double skin panel includes an outer plate, an inner plate, and a support plate interposed between the outer plate and the inner plate. In addition, when joining the double skin panels, after forming the double skin panel assembly by abutting the ends of the outer plates of the adjacent double skin panels and the ends of the inner plates together, a rotating tool is used. It is known that friction stir welding is performed on the abutted portions.

JP 2008-272768 A

  However, since the double skin panel is a thin and long metal member, it is difficult to accurately abut the outer plates and the inner plates of the pair of double skin panels. Further, even if the double skin panel assembly is fixed so as not to be moved by a jig, there is a problem that the double skin panels are separated from each other when the rotary tool is moved and joined.

  From such a point of view, an object of the present invention is to provide an assembly of a double skin panel and a friction stir welding method of the double skin panel that can suitably join the double skin panel.

In order to solve such a problem, the present invention is an assembly of a pair of double skin panels, wherein a collar portion formed at an end of an outer plate of one of the double skin panels and the other double skin panel A flange formed at an end of the outer plate is engaged, and each of the flanges extends from the thick portion of the outer plate, and is continuous with the thin portion in the plate thickness direction. And a pair of the projecting parts engaged with each other, an end surface formed at an end of the inner plate of one of the double skin panels, and the other double skin panel The end face of the inner plate is abutted without being engaged.

According to such a configuration, by engaging the flanges of the outer plates, it is possible to prevent the double skin panels from being separated from each other when they are joined. When the collar is provided on the inner plate, it is difficult to abut the double skin panels. However, in the present invention, the inner plate is not provided with the collar and only the end surfaces are abutted. Thereby, the work of the preparation process which abuts a double skin panel can be labor-saving. Further, the collar portion can be provided with a simple configuration.

  In addition, an overhanging inclined surface is formed on a side portion of the overhanging portion of one of the double skin panels, and the thick wall portion of the other double skin panel is in surface contact with the overhanging inclined surface. It is preferable that a thick inclined surface is formed. According to such a configuration, the inclined surfaces can be slid obliquely, so that the double skin panels can be easily engaged with each other.

  Further, when a support plate is interposed between the outer plate and the inner plate, the length from the support plate to the end surface is c (mm) and the thickness of the thick portion is t (mm). , C ≦ 7.0 × t + 18.5 mm is preferably set. If the distance from the support plate to the end surface is large, the deformation on the end side of the member may increase, but according to such a configuration, the deformation on the end side of the member is small.

  The present invention also relates to a friction stir welding method for a double skin panel in which the ends of a pair of double skin panels are friction stir welded to each other, and the flange formed on the end of the outer plate of one of the double skin panels The end surface formed at the end of the inner plate of one of the double skin panels and the other double skin panel while engaging the flange formed at the end of the outer plate of the other double skin panel A preparatory step for abutting without engaging the end surface of the inner plate, and a joining step for performing friction stir welding on the engaging portion and the abutted abutting portion engaged in the preparatory step. Features.

  According to this method, by engaging the flanges of the outer plates, it is possible to prevent the double skin panels from being separated from each other when they are joined. When the collar is provided on the inner plate, it is difficult to abut the double skin panels. However, in the present invention, the inner plate is not provided with the collar and only the end surfaces are abutted. Thereby, the work of the preparation process which abuts a double skin panel can be labor-saving.

  Moreover, in the said joining process, after joining the said engaging part, it is preferable to join the said abutting part. There is no problem in terms of bonding strength regardless of which of the engaging part or the abutting part is joined first, but if the engaging part is joined first, the amount of angular deformation between the double skin panels after joining can be reduced. it can.

  According to the double skin panel assembly and the double skin panel friction stir welding method according to the present invention, the double skin panel can be suitably joined.

It is the perspective view which showed the double skin panel which concerns on this embodiment. It is the perspective view which showed the friction stirring apparatus which concerns on this embodiment. It is the perspective view which showed the friction stirring apparatus which concerns on this embodiment. It is the side view which showed the bobbin tool which concerns on this embodiment. It is the front view which showed the preparation process of the joining method which concerns on this embodiment. It is the perspective view which showed the 1st joining process of the joining method which concerns on this embodiment. It is the perspective view which showed the 2nd joining process of the joining method which concerns on this embodiment. It is the front view which showed the modification of the engagement form. It is the front view which showed the engagement form or butt | matching form of Example 1, Comprising: (a) is type I, (b) is type II, (c) shows type III. It is the graph which showed the result of the angular deformation of Type I. It is the graph which showed the result of the angular deformation of type II. It is the graph which showed the result of the angular distortion of type III. It is the table | surface which put together the rotation direction of the bobbin tool, the winding direction of the spiral groove, and the engagement form. It is a figure for showing Example 3, Comprising: (a) shows a test body, (b) is the table | surface which put together each condition. 10 is a graph showing the correlation of Example 3.

  Embodiments of the present invention will be described in detail with reference to the drawings. First, the double skin panel used in this embodiment will be described. The vertical and horizontal directions in the description follow the arrows in FIG.

  As shown in FIG. 1, the double skin panel 1 is a thin metal long member, and mainly includes an outer plate 2, an inner plate 3, and support plates 4 and 4. Each support plate 4 is perpendicular to the outer plate 2 and the inner plate 3. The double skin panel 1 is used as a structure such as a railway vehicle, an aircraft, a ship, and a civil engineering structure by joining a plurality of double skin panels 1 in the left-right direction. Although the manufacturing method in particular of the double skin panel 1 is not restrict | limited, In this embodiment, it shape | molds by extrusion molding. The material of the double skin panel 1 is not particularly limited as long as it is a metal capable of friction stirring, but in this embodiment, an aluminum alloy is used.

  The outer plate 2 includes a central portion 5, a right plate-like end portion 10 that extends from the central portion 5 to the right side, and a left-side plate-like end portion 20 that extends from the central portion 5 to the left side. .

  The right plate-shaped end portion 10 includes a first outer plate thick portion 11, a first flange portion 12, and a first build-up portion 13. The first outer plate thick portion 11 is perpendicular to the support plate 4 and extends to the right side. The first flange portion 12 has a hook shape, and includes a first thin portion 14 that extends to the right side and a first overhang portion 15 that protrudes perpendicularly from the first thin portion 14. The first thin portion 14 is about one third of the thickness of the first outer plate thick portion 11.

  The first overhang 15 projects from the tip of the first thin portion 14 toward the inner plate 3 side. Formed on the side of the first overhanging portion 15 is a first overhanging inclined surface 16 that is inclined so as to approach the support plate 4 toward the inner plate 3 side. The first build-up portion 13 is a portion that protrudes upward from the upper surfaces of the first outer plate thick portion 11, the first thin portion 14, and the first overhang portion 15 with a certain thickness and is formed thick.

  The left side plate-like end portion 20 is mainly composed of a second outer plate thick portion 21, a second flange portion 22, and a second build-up portion 23. The second outer plate thick portion 21 is perpendicular to the support plate 4 and extends to the left side. The second flange portion 22 has a hook shape, and is composed of a second thin portion 24 extending to the left side and a second overhang portion 25 extending perpendicular to the second thin portion 24. Yes. The second thin portion 24 is about one third of the thickness of the second outer plate thick portion 21.

  The second projecting portion 25 projects from the tip of the second thin portion 24 toward the side opposite to the inner plate 3. At the left end of the second outer plate thick portion 21, a second thick portion inclined surface 26 that is inclined so as to be separated from the support plate 4 toward the inner plate 3 side is formed. The second thick part inclined surface 26 has the same inclination angle as the first projecting inclined surface 16. The second build-up portion 23 is a portion that protrudes upward from the upper surface of the second outer plate thick portion 21 with a certain thickness and is formed thick.

  The inner plate 3 includes a central portion 6, a right plate-like end portion 30 that extends from the central portion 6 to the right side, and a left-side plate-like end portion 40 that extends from the central portion 6 to the left side. .

  The right side plate-like end portion 30 is composed of a first inner plate thick portion 31, a first built-up portion 32, and a first end surface 33. The first inner plate thick portion 31 is perpendicular to the support plate 4 and extends to the right side. The first built-up portion 32 is a portion that protrudes downward from the lower surface on the tip side of the first inner plate thick portion 31 and is thick.

  The left plate-like end portion 40 includes a second inner plate thick portion 41, a second built-up portion 42, and a second end surface 43. The second inner plate thick portion 41 is perpendicular to the support plate 4 and extends to the left side. The second build-up portion 42 is a portion that protrudes downward from the lower surface on the tip side of the second inner plate thick portion 41 and is thick.

  Next, the friction stirrer used in this embodiment will be described. 2 and 3, the friction stirrer 61 includes an external holder 62, an internal holder 63 disposed inside the external holder 62, a slide shaft 64 inserted into the internal holder 63, and a slide shaft. And a bobbin tool 51 attached to the tip of 64.

  The outer holder 62 is a member having a cylindrical shape, and accommodates the inner holder 63 inside. The external holder 62 is a part fixed to a chuck portion (not shown) of the friction stirrer 61 and rotates around the vertical axis as the friction stirrer 1 is driven to rotate. As shown in FIG. 3, the inner holder 63 is a cylindrical member, and a long hole 63 a penetrating in the radial direction is formed on the outer peripheral surface thereof. The inner holder 63 rotates integrally with the outer holder 62 by being fixed to the outer holder 62.

  The slide shaft 64 is a shaft member that is inserted into the inner holder 63. On the side surface of the slide shaft 64, a protrusion 64a that protrudes outward is formed. When the protrusion 64a and the elongated hole 63a of the internal holder 63 are engaged, the internal holder 63 and the slide shaft 64 rotate integrally. The slide shaft 64 is movable in the vertical direction with respect to the inner holder 63 within the range of the long hole 63a.

  As shown in FIG. 4, the bobbin tool 51 includes a first shoulder 52, a second shoulder 53, and a pin 54 interposed between the first shoulder 52 and the second shoulder 53. Each of the first shoulder 52, the second shoulder 53, and the pin 54 has a substantially cylindrical shape and is coaxial. The bobbin tool 51 is a tool for friction stir welding by moving the pin 54 while rotating the joint portion at high speed.

  The first shoulder 52 includes a large diameter portion 52a, a tapered portion 52b, and a lower end surface 52c. The tapered portion 52b is gradually reduced in diameter toward the lower side. On the lower end surface 52 c of the first shoulder 52, although not shown, a concave groove having a spiral shape in plan view is formed along the periphery of the pin 54.

  The second shoulder 53 is configured to have a groove on the outer peripheral surface. The second shoulder 53 includes a large diameter portion 53a, a tapered portion 53b, and an upper end surface 53c. The tapered portion 53b is gradually reduced in diameter toward the upper side. The outer diameter Y1 of the large diameter portion 53a is smaller than the outer diameter X1 of the large diameter portion 52a. Further, the diameter Y2 of the upper end surface 53c is equal to the diameter X2 of the lower end surface 52c.

  On the outer peripheral surface of the pin 54, a spiral groove 55 formed by a left-hand screw is formed. That is, the spiral groove 55 is wound so as to be counterclockwise from top to bottom. The outer diameter V of the pin 54 is smaller than the diameter X2 and the diameter Y2. The slide shaft 64 is connected to the first shoulder 52 via a nut.

  The distance between the shoulders of the bobbin tool 51 (the length of the pin 54) is the plate thickness of the portion to be joined (in this embodiment, the total thickness of the first outer plate thick portion 11 and the first build-up portion 13). The following is preferable. The depth, pitch, and the like of the spiral groove 55 may be appropriately set according to the material of the metal plate to be frictionally stirred, the thickness of the portion to be joined, the distance between the shoulders, and the like.

  Here, when friction stir welding is performed, the temperature of the joint portion increases due to frictional heat, the plate-like end portions 10 and 20 or the plate-like end portions 30 and 40 warp upward or downward, and the bobbin tool 51 Receives upward or downward force according to warpage. Further, the metal fluidized plastically by friction stirring is guided to the spiral groove 55 and flows, and the bobbin tool 51 receives an upward or downward force according to the flow.

  In the friction stirrer 61 according to the present embodiment, since the slide shaft 64 is formed so as to be movable in the inner holder 63, the plate-like end portions 10, 20 (30, 40) are warped upward, for example, or are plastic. When the fluidized metal is flowing upward, the bobbin tool 51 is configured to move upward by a predetermined distance following the warpage and flow. On the other hand, the friction stirrer 61 follows the warpage or flow when the plate-like end portions 10 and 20 (30, 40) warp downward, for example, or when plastic fluidized metal flows downward. The bobbin tool 51 is configured to move downward by a predetermined distance.

  Note that the metal flow in the vertical direction based on the spiral groove stops in a minute amount compared to the metal flow in the circumferential direction due to the rotation of the pin 54 of the bobbin tool 51. Therefore, the movement in the vertical direction of the bobbin tool 51 based on the plastic fluidized metal is also kept to a very small amount.

  In addition, the friction stirrer 61 of this embodiment is an illustration and may be another form. For example, in this embodiment, a floating bobbin tool in which the bobbin tool 51 is configured to be movable in the vertical direction is used. However, a friction stirrer in which the bobbin tool 51 is configured to be immovable in the vertical direction may be used. Further, instead of the bobbin type tool, a rotating tool including one shoulder and a pin suspended from the shoulder may be used.

  Next, the joining method of the double skin panel which concerns on this embodiment is demonstrated. Here, the case where two double skin panels 1 having the same shape are provided side by side is illustrated. In this joining method, a preparation process and a joining process are performed.

  In the preparation step, as shown in FIG. 5, the double skin panels 1 and 1 are brought into contact with each other to form a double skin panel assembly, and the assembly is restrained so as not to move. In the description, one double skin panel is labeled “1A”, the other double skin panel is labeled “1B”, and “A” and “B” are added to the corresponding elements. Distinguish.

  Specifically, in the preparation step, the first flange portion 12A of the double skin panel 1A and the second flange portion 22B of the double skin panel 1B are engaged, and the first end surface 33A and the second end surface 43B are brought into contact with each other. . Thereby, 12 A of 1st collar parts and the 2nd collar part 22B engage without a clearance gap, and the engaging part M is formed. On the other hand, the first end face 33A and the second end face 43B are abutted to form an abutting portion N. An extension line of a portion where the overhanging portion 15A and the overhanging portion 25B are engaged and a portion where the first end surface 33A and the second end surface 43B are abutted with each other is referred to as a “center line C”.

  The upper surface of the first built-up portion 13A and the upper surface of the second built-up portion 23B are flush with each other, and the lower surface of the first outer plate thick portion 11A and the lower surface of the second outer plate thick portion 21B are flush with each other. It has become. Further, the upper surface of the first inner plate thick portion 31A and the upper surface of the second inner plate thick portion 31B are flush with each other, and the lower surface of the first built-up portion 32A and the lower surface of the second built-up portion 42B are surfaces. It is one. After the double skin panel assembly is formed, the assembly is restrained so as not to move with a jig.

  In the joining step, as shown in FIG. 6, a first joining step for joining the engaging portion M using the bobbin tool 51 and a second joining step for joining the butting portion N are performed.

  In the first joining step, the double skin panel 1A is arranged on the left side in the traveling direction. Then, the center of the pin 54 of the bobbin tool 51 rotated to the right is aligned with the center of the engaging portion M in the height direction on the center line C, and is plunged into the engaging portion M. Then, friction stir welding is performed along the engaging portion M from the front side toward the rear side. Note that a plasticizing region W1 is formed in the engaging portion M along a locus along which the bobbin tool 51 has moved (see FIG. 7).

  In the second joining step, as shown in FIG. 7, when the first joining step is completed, the double skin panel assembly is turned over and the double skin panel assembly is again restrained so as not to move. Then, the center of the pin 54 of the bobbin tool 51 rotated to the right is aligned with the center in the height direction of the abutting portion N on the center line C, and is entered into the abutting portion N. Then, friction stir welding is performed along the abutting portion N from the front side toward the rear side. A plasticized region (not shown) is formed in the abutting portion N along the locus along which the bobbin tool 51 has moved. Thus, the first outer plate 2A and the second outer plate 2B, and the first inner plate 3A and the second inner plate 3B are joined.

  According to the joining method according to the present embodiment described above, when the friction stir welding is performed by engaging the first flange 12A of the first outer plate 2A and the second flange 22B of the second outer plate 2B. It is possible to easily prevent the double skin panels 1A and 1B from separating. On the other hand, the first inner plate 3A and the second inner plate 3B are not provided with a flange, but the first end surface 33A and the second end surface 43B are abutted to save labor in the preparation process and the production of the double skin panel. Can do. When the double skin panels 1A and 1B are long, it is difficult to engage the first inner plate 3A and the second inner plate 3B by providing a collar portion. However, according to the present embodiment, the engagement operation is difficult. Becomes easy.

  In the preparation step, when the first collar portion 12A and the second collar portion 22B are engaged, the first projecting inclined surface 16A and the second main body inclined surface 26B can be engaged while sliding. As a result, the engaging operation is facilitated. Specifically, when the double skin panel 1A is lowered from above the placed double skin panel 1B, the first protruding inclined surface 16A and the second main body inclined surface 26B are simply slid to engage with each other. Can be made.

  Further, by providing the first overhanging portion 15A and the second overhanging portion 25B, they can be engaged with each other with a simple configuration. Moreover, it can prevent that a metal runs short in the case of friction stir welding by providing the build-up part (13A, 23B, 32A, 42B). In the present embodiment, a left-handed spiral groove 55 is formed on the pin 54, and the plastic fluidized metal is introduced into the spiral groove 55 in order to move the bobbin tool 51 from the front side to the rear side while rotating it to the right. There is a tendency to flow toward the second shoulder 53 side. Therefore, the metal on the first shoulder 52 side is provided by providing the build-up portion (13A, 23B, 32A, 42B) on the side facing the first shoulder 52 of the outer plates 2A, 2B and the inner plates 3A, 3B. A shortage can be avoided.

  Moreover, there is no problem in terms of joining strength regardless of which of the engaging portion M or the abutting portion N is joined first, but when the engaging portion M is joined first, the double skin panels 1A and 1B after joining are joined together. The amount of angular deformation can be reduced.

  In addition, the shape and engagement form of the double skin panels 1A and 1B are not particularly limited as long as they are not separated from each other. Like this embodiment, it is preferable to engage so that the edge part of double skin panel 1A, 1B may become flush | planar, and a clearance gap may be eliminated. Moreover, the thing which provided the 1st collar parts 12 and 12 in the both ends of the outer plate 2 of one double skin panel is formed, and the second collar parts 22 and 22 are formed in the both ends of the outer plate 2 of the other double skin panel. May be formed, and these double skin panels may be alternately arranged and engaged and joined together. For example, as shown in FIG. 8, it is good also as a shape which does not provide an inclination in the side part of 15 A of 1st overhang | projection parts and the 2nd overhang | projection part 25B. In the present embodiment, the support plate 4 is formed perpendicular to the outer plate 2 and the inner plate 3, but may be inclined.

<Example 1>
Next, Example 1 of the present invention will be described. FIG. 9 is a front view showing an engagement form or a butting form according to the first embodiment, where (a) shows type I, (b) shows type II, and (c) shows type III. In Example 1, three types of specimens were prepared, and friction stir welding was performed only on the type I, type II, and type III portions, and the respective angular deformations were investigated.

  Types I to III are double skin panels 1A and 1B made of an aluminum alloy 6N01-T5 material. As shown in FIGS. 1 and 5, the outer plate thick portion (first outer plate thick portion 11, The thickness a of the second outer plate thick portion 21) is 3 mm, the thickness dimension b of the build-up portion (build-up portion 13A, 23B, 32A, 42B) is 0.5 mm, from the support plate 4 to the first end surface 33 Length c and the length c from the support plate 4 to the second end face 43 = 15 mm, the length d from the upper surface of the first outer plate 2A to the lower surface of the first inner plate 3A, and the left-right width dimension e = 200 mm. The extension dimension is set to 5000 mm.

  As shown in FIG. 4, the bobbin tool 51 has a diameter X2 of the lower end surface 52c of the first shoulder 52 and a diameter Y2 of the upper end surface 53c of the second shoulder 53 = 10 mm, an outer diameter Y1 = 15 mm of the second shoulder 53, The outer diameter V of the pin 54 is set to 6 mm. The length from the first shoulder 52 to the second shoulder 53 (the length of the pin 54) is set to 2.9 mm. The shape of the concave groove (not shown) formed in the lower end surface 52c of the first shoulder 52 is a spiral shape in plan view, the groove depth is set to 0.3 mm, and the groove pitch is set to 1.2 mm. . The bobbin tool 51 is moved from the front side to the back side in FIGS. 9A to 9C in both types I to III. The rotation speed of the bobbin tool 51 was set to 2000 rpm, and the moving speed was set to 1000 mm / min.

In Type I, as shown in FIG. 9A, the double skin panel 1A is disposed on the left side in the moving direction of the bobbin tool 51, and the double skin panel 1B is disposed on the right side. 22B is engaged.
In Type II, as shown in FIG. 9 (b), the double skin panel 1A is arranged on the right side in the traveling direction of the bobbin tool 51, and the double skin panel 1B is arranged on the left side. 22B is engaged.
In Type III, as shown in FIG. 9C, the double skin panel 1A is arranged on the left side in the traveling direction of the bobbin tool 51, the double skin panel 1B is arranged on the right side, and the first end face 33A and the second end face are arranged. 43B.

  FIG. 10 is a graph showing the result of type I angular deformation. FIG. 11 is a graph showing the result of type II angular deformation. FIG. 12 is a graph showing the result of type III angular deformation. The horizontal axis indicates the length in the width direction from the left end of each joined specimen. The position of the width direction = 200 mm indicates the position of the center line C. The vertical axis represents the height after joining from an arbitrary reference point in each specimen. The height of each point was measured at distances of 50 mm, 200 mm, 400 mm, 600 mm, 800 mm, and 950 mm in the extending direction from the front end of each specimen.

  As shown in FIGS. 10 and 11, in Type I and Type II, the height at the position of width direction = 180 mm is the highest, and the height at the position of width direction = 210 mm is the lowest. That is, it has a shape in which a slight difference occurs in the joint portion. Further, the height difference at the position of the width direction = 180 mm to 210 mm was larger in Type II than in Type I. Further, the height difference from the position of the width direction = 210 mm to the right end of the specimen was larger in Type II than in Type I. In other words, it was found that type II had a larger overall angular deformation than type I.

  As shown in FIGS. 9A and 9B, this is due to the difference in the direction of the force that the double skin panels 1A and 1B receive from the bobbin tool 51 and the engagement form of the double skin panels 1A and 1B. It is thought to be a thing. When the bobbin tool 51 (the spiral groove 55 of the pin 54 is a left screw) according to the present embodiment is rotated rightward and moved from the front side to the back side of the paper surface of FIG. 9, it is considered that the stress F1 acts.

  Therefore, in the case of type II shown in FIG. 9B, the inclination direction of the inclined surface Ma of the engaging portion M is substantially parallel to the direction of action of the stress F1, and the stress F1 is input to the center line C. Since the position and the inclined surface Ma are on the same side, the double skin panel 1B easily moves to the lower right side, and the possibility that the double skin panels 1A and 1B are separated during joining increases.

  On the other hand, in the case of Type I shown in FIG. 9A, the inclination direction of the inclined surface Ma of the engaging portion M intersects with the direction of application of the stress F1, and the input position and inclination of the stress F1 with respect to the center line C Since the surface Ma is on the opposite side, it is possible to effectively prevent the double skin panels 1A and 1B from separating during the joining.

  On the other hand, as shown in FIG. 12, in Type III, the height at the position where the width direction is 180 mm and the position where the width direction is 210 mm are about the same. That is, the height of the joining portion is the highest compared to the left and right ends, and is a mountain shape when viewed from the front. Further, the height difference of type III is larger than the height difference of types I and II. If a plurality of (for example, five) double skin panels are disposed and friction stir welding is performed from the abutting portion N side as in Type III, it is considered that the total angular deformation of the joined double skin panels increases. Therefore, it is preferable to perform friction stir welding from the engaging portion M side before the abutting portion N.

  FIG. 13 is a table summarizing the rotation direction of the bobbin tool, the winding direction of the spiral groove, and the engagement form. In FIG. 13, four patterns of preferable conditions 1 to 4 are shown. As shown in Condition 1 (similar to this embodiment), when the spiral groove 55 rotates the left-handed bobbin tool 51 to the right and moves it from the front side to the back side in FIG. It is preferable to do.

  That is, in condition 1, since the bobbin tool 51 is rotated to the right, the force of the right direction component acts on the center line C from the left side, and the plastic fluidized metal is guided to the spiral groove and flows from top to bottom. . Therefore, in condition 1, the stress F1 acts as shown in the engagement form. Therefore, in Type I, the inclined surface Ma of the second flange portion 12B and the engaging portion M is set so as to face the stress F1, thereby preventing the double skin panels 1A and 1B from being separated during joining. it can.

  Further, as shown in Condition 2, when the spiral groove 55 rotates the right-handed bobbin tool 51 counterclockwise and moves it from the front side to the back side in FIG. 13, the engagement form is preferably type II.

  That is, in condition 2, since the bobbin tool 51 is rotated counterclockwise, the force in the left direction component acts on the center line C from the right side, and the plastic fluidized metal is guided to the spiral groove and flows from top to bottom. . Therefore, under condition 2, the stress F2 acts as shown in the engagement form. Therefore, in Type II, the second flange portion 12B and the inclined surface Ma of the engaging portion M are set so as to face the stress F2, thereby preventing a gap from being generated between the double skin panels 1A and 1B. Can do.

Similarly, as shown in condition 3, when the spiral groove 55 rotates the right-handed bobbin tool 51 to the right and moves it from the front side to the back side in FIG. 13, the engagement form is preferably type IV. .
Similarly, as shown in Condition 4, when the spiral groove 55 rotates the left-handed bobbin tool 51 counterclockwise and moves it from the front side to the back side in FIG. Is preferred.

  Even in the case of conditions 3 and 4, the double skin panel 1A ′ during joining can be obtained by setting the inclined surface Ma ′ and the second flange 12B ′ of the engaging portion M so as to face the stresses F3 and F4. , 1B ′ can be prevented from separating.

  In addition, it is preferable to provide a built-up portion on the first shoulder 52 side in the conditions 1 and 2 and on the second shoulder 53 side in the conditions 3 and 4. Thereby, since metal can be replenished to the side which lacks metal by friction stirring, it can compensate for becoming short of metal.

<Example 2>
In Example 2, friction stir welding was performed using five double skin panels having a size different from that of Example 1. Referring to FIG. 1, the double skin panel of Example 2 has a thickness a = 4.0 mm of the outer plate thick part, a thickness dimension b = 0.5 mm of the built-up part, a left-right width dimension e = 400 mm, and an extension. The dimension is set to 12,500 mm.

  4, the diameter X2 of the lower end surface 52c of the first shoulder 52 is 15 mm, the outer diameter Y1 of the second shoulder 53 is 18 mm, the diameter Y2 of the upper end surface 53c of the second shoulder 53 is 15 mm, The outer diameter V of 54 was set to 9 mm. The length from the first shoulder 52 to the second shoulder 53 (the length of the pin 54) is set to 3.7 mm. The rotation speed of the bobbin tool was set to 1000 rpm. Further, the bobbin tool moving speed was set to 1000 mm / min on the engaging portion M side and 1500 mm / min on the abutting portion N side.

  In Example 2, one double skin panel was set on a table, and the next double skin panel was lowered from above and engaged and butted. After engaging the five double skin panels without any gaps in the same operation, the assembly was restrained so as not to move. In order to prevent the assembly from floating, the assembly was pressed by a lateral pressing clamp arranged at a pitch of 1.5 m in the extending direction. In addition, the four corners of the assembly were clamped easily. Then, friction stir welding was performed in order from the end.

  Even under the conditions of Example 2, it was possible to produce a face material free from poor bonding. Here, generally, when friction stir welding is performed on a metal member, heat shrinkage occurs, and thus the metal member after bonding may be warped. If the friction stir welding is performed on the front and back of the metal member, the friction stir welding is performed on the surface side of the metal member with the same rotation speed, moving speed, and moving length of the rotary tool, and then the friction is applied on the back surface side. When the stir welding is performed, there is a possibility that the back side is warped so as to be concave.

  This is because, after the friction stir welding of the surface side, the metal member is along the concave side on the surface side due to thermal shrinkage, so if the metal member along the surface is placed on a flat table, the table and the metal member The gap between becomes larger. If the back side is friction stir welded in this state, the amount of heat remaining on the metal member increases because the heat from the friction stir does not easily escape to the table. As a result, combined with the heat remaining in the metal member, the back side is greatly warped so as to be concave.

  Therefore, as in the second embodiment, if the moving speed of the bobbin tool on the abutting portion N side is set faster than the engaging portion M side, the heat input at the time of joining to the abutting portion N can be reduced. Thereby, it can prevent that the double skin panel after joining curves.

<Example 3>
In Example 3, a test was conducted to investigate the relationship between the plate thickness and the length of the plate-like end portion. As shown in FIG. 14 (a), the ends of the specimens 101, 101 having a U-shape in cross-sectional view were brought into contact with each other, and friction stir welding was performed on the butt portion N. Each specimen 101 includes a support member 102 and a plate-like end portion 103 extending vertically from the support member 102.

  The height of the specimen 101 was set to 30 mm, and the extension dimension was set to 500 mm. As shown in FIGS. 14 (a) and 14 (b), friction stir welding is performed in each condition using the plate thickness a of the plate-like end portion 103 and the length c from the support member 102 to the tip of the plate-like end portion 103 as parameters. Went. FIG. 14B summarizes the conditions and bonding quality of Example 3 in a table. The dimensions of the bobbin tool are as shown in the table of FIG.

  As shown in FIG. 14B, when the plate thickness a = 3 mm and the length c from the support member 102 to the tip of the plate-like end portion 103 = 50 mm, poor bonding occurred. Further, in the case of the plate thickness a = 6 mm, bonding failure occurred when the length c = 70 mm and 80 mm. Further, in the case of the plate thickness a = 12 mm, bonding failure occurred when the length c = 120 mm. That is, if the length of the plate-like end portion 103 is too long with respect to the support member 102, the tip end side of the plate-like end portion 103 is likely to be deformed, which tends to cause poor bonding.

  FIG. 15 is a graph showing the correlation of Example 3. The horizontal axis in FIG. 15 indicates the plate thickness a, and the vertical axis indicates the length c from the support member to the tip of the plate-like end. From this graph, the length c from the support member to the tip is preferably set so as to satisfy the length c ≦ 7.0 × plate thickness a + 18.5 mm. Under these conditions, deformation of the plate-like end portion 103 can be suppressed, so that poor bonding is unlikely.

DESCRIPTION OF SYMBOLS 1 Double skin panel 2 Outer plate 3 Inner plate 4 Support plate 10 Right side plate-shaped edge part 11 First outer plate thick part 12 First collar part 13 First build-up part 14 First thin part 15 First overhang part 16 First overhanging inclined surface 20 Left side plate-like end portion 21 Second outer plate thick portion 22 Second flange portion 23 Second build-up portion 24 Second thin portion 25 Second overhang portion 26 Thick portion inclined surface 30 Right side Plate-like end portion 31 First inner plate thick portion 32 First build-up portion 33 First end surface 40 Left plate-like end portion 41 Second inner plate thick portion 42 Second build-up portion 42 Second end surface 51 Bobbin tool 52 First shoulder 53 Second shoulder 54 Pin 55 Spiral groove a Plate thickness c Length

Claims (5)

An assembly of a pair of double skin panels,
The flange formed at the end of the outer skin of one of the double skin panels is engaged with the flange formed at the end of the outer skin of the other double skin panel,
Each of the flanges includes a thin part extending from the thick part of the outer plate, and an overhang part that extends continuously in the thickness direction of the thin part,
While the pair of overhanging portions are engaged,
A set of double skin panels, characterized in that an end surface formed at an end portion of the inner plate of one of the double skin panels and an end surface of the inner plate of the other double skin panel are abutted without being engaged with each other. Solid. An overhanging inclined surface is formed on the side of the overhanging portion of one of the double skin panels,
2. The double skin panel assembly according to claim 1 , wherein a thick inclined surface that is in surface contact with the projecting inclined surface is formed in the thick portion of the other double skin panel. Support plate within said plates and front Symbol outer plate is interposed,
When the length from the support plate to the end face is c (mm) and the thickness of the thick part is t (mm),
3. The double skin panel assembly according to claim 1 , wherein the assembly is set so as to satisfy c ≦ 7.0 × t + 18.5 mm. A friction stir welding method for a double skin panel in which the ends of a pair of double skin panels are friction stir welded,
One of the double skin panels is engaged with a flange formed at an end of the outer plate of one of the double skin panels and a flange formed at the end of the outer plate of the other double skin panel. A preparation step of abutting the end face formed at the end of the inner plate and the end face of the inner plate of the other double skin panel without engaging with each other;
A friction stir welding method for a double skin panel, comprising: a friction stir welding for the engaging portion engaged in the preparation step and the butted butted portion. 5. The friction stir welding method for a double skin panel according to claim 4 , wherein, in the joining step, the abutting part is joined after joining the engaging part.

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