JP2009113085A - Method for producing joined product, and joined structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily producing a joined product having increased joining reliability, and to provide a joined structure having increased joining reliability. <P>SOLUTION: The edge part to be joined in a hollow joining member B (rib-fitted hollow extruded shape 14) in which a plurality of ribs 24a, 24b are formed is inserted into a space between planar flange parts 16a, 16b parallelly elongating so as to be confronted each other in a joining member A (flange-fitted extruded shape 12), the flange parts 16a, 16b in the joining member A and the upper and lower face sheet parts 20a, 20b in the hollow joining member B are mutually lapped, thereafter, the probes of a friction stir joining tool are inserted into the respective projecting parts 30 provided at the outer surfaces of the parts disposed with the ribs 24a, 24b in the upper and lower face sheet parts 20a, 20b through the flange parts 16a, 16b, and are moved along the respective projecting parts 30, and the joining member A and the hollow joining member B are subjected to lap friction stir joining, so as to produce a joined product 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a bonded product and a bonded structure, and in particular, a bonded product that is advantageously used as a rigid structural member, for example, an automobile frame, by bonding a bonded member such as an extruded profile. And a joining structure that is advantageously employed in a frame structure of an automobile.

  Conventionally, in the automobile industry, low fuel consumption has been demanded from the viewpoint of protecting the global environment and saving energy. In order to satisfy the demand for lower fuel consumption, it is essential to reduce the weight of automobiles.

  For example, in recent years, a space frame structure using a hollow extruded profile made of an aluminum alloy has been adopted as a frame structure of an automobile. When manufacturing such a space frame, it is necessary to join extruded shapes, and various studies have been made on the joining structure and joining method between the extruded shapes. For example, in Patent Document 1, a notch for fitting is provided in at least one of a metal member such as a hollow extruded shape member, and the two metal members are crossed by fitting the metal members in the notch. And the two hollow extrusion shape members are joined by carrying out friction stir welding of the butt | matching part of a metal member from the outside.

  However, in the method of Patent Document 1, for the inherent reason of the friction stir welding method in which the joining tool cannot be applied to the corner portion, the cross fitting portion of the portion that is in a butt state is used. There is a problem that only friction stir welding can be performed and sufficient strength cannot be ensured. For this reason, in Patent Document 2, in order to solve this problem, the core is arranged inside the cross fitting portion, and the fitted members are friction stir joined to the core, respectively. The method of joining both members through the above has been clarified. However, in the case where the core is arranged and joined to the hollow extruded shape member in this way, the operation of inserting the core into the extruded shape member is extremely complicated, the work man-hour is increased, and the productivity is remarkably lowered. There's a problem.

  Patent Document 3 discloses a technique in which square pipes are brought into contact with each other and the abutting portions are friction stir welded. However, in the method described in Patent Document 3, the place where the square pipes can be friction stir welded is limited to the butted portion, so it is difficult to increase the joint reliability by further increasing the joint reliability. there were.

  Furthermore, in Patent Document 4, when the first member and the second member are joined by friction stir welding, a plate member is used as the first member and an extruded shape member having a rib portion is used as the second member. Then, from the surface side of the first member, the probe of the friction stir welding tool is inserted into the portion where the rib portion of the second member is formed so as to be in a predetermined insertion position, and overlap friction It has been clarified that by performing stir welding, a bonded product in which generation of defects due to buckling or the like is advantageously prevented can be obtained. However, in this patent document 4, only the joining structure of the 1st member which has one plate-shaped part, and the 2nd member which has a rib part is clarified, A pair of flange part extended in parallel There is no clarification about the joining of the member having the shape and the hollow member or the joining of the member intersected in the T-shape or L-shape. Further, in Patent Document 4, the plate material is overlaid on the extruded shape member in which the rib portion is formed, and the friction stir welding tool is inserted from the plate material so that the friction stir welding is performed. If there is distortion or unevenness on the outer surface of the extruded shape, there is a possibility that the joining becomes incomplete, and a sound joint cannot be obtained, and the flatness of the shape is affected. In addition, since the rib portion formed in the extruded shape member cannot be visually recognized from the outside, some mark indicating a portion to be joined (rib portion forming portion) on the outer surface of the plate material prior to joining. It was necessary to put on, which was the cause of significantly reducing the production efficiency.

JP-A-9-323179 Japanese Patent Laid-Open No. 11-59484 JP 2003-236683 A JP 2005-329453 A

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is to provide a method for easily manufacturing a bonded product with improved bonding reliability. In addition, an object of the present invention is to provide a joint structure with improved joint reliability.

  In order to solve this problem, the gist of the present invention is that the flat plate-like flange portions extending in parallel to face each other are opposed to the joining member A having a structure in which the plate-like flange portions are integrally formed. In the method of manufacturing the joining product which consists of these 2 types of joining members by fitting the edge part of the hollow joining member B which has a faceplate part located mutually opposite in parallel between the flange parts to perform, and friction stir welding In addition, as the hollow joint member B, the face plate portions are integrally connected by a plurality of ribs provided between the opposing surfaces of the face plate portion, and the ribs of the face plate portion are An end portion to which the hollow joint member B is to be joined is formed on the outer surface of the disposed portion using a shape member in which convex portions whose tip portions are flattened are integrally formed along the plurality of ribs. Is inserted between the flange portions of the joining member A. Then, after overlapping the flange portion of the joining member A and the face plate portion of the hollow joining member B, the probe of the friction stir welding tool is passed through the flange portion of the joining member A under high speed rotation. By inserting into each of the convex portions of the joining member B and moving along each of the convex portions, the joining member A and the hollow joining member B are subjected to overlap friction stir welding, and the hollow joining member B The present invention resides in a method for manufacturing a bonded product, wherein a plurality of bonded portions extending in the longitudinal direction are formed.

  In addition, according to the preferable aspect of the manufacturing method of the bonded product according to the present invention, each of the convex portions provided on the face plate portion of the hollow bonding member B has a rectangular cross section or a trapezoidal cross section, The width of the tip portion of each convex portion is 2 mm or more larger than the diameter of the probe and not more than the thickness of the rib, while the width of the base portion of each convex portion is the same as the width of the tip portion or not. Larger than.

  Moreover, according to one of the other preferable aspects in the manufacturing method of the joining product according to this invention, the thickness of each rib of the said hollow joining member B is 2 mm or more larger than the diameter of the said probe, and the sum total of these each rib The thickness is set to ½ or less of the distance between the outer wall portions connecting the face plate portions of the hollow joint member B.

  Furthermore, according to one of the desirable aspects in the manufacturing method of the bonded product according to the present invention, the hollow bonding member B formed with the convex portions is fitted between the flange portions of the bonding member A, and the bonding member is inserted. When the A flange portion and the face plate portion of the hollow joint member B are overlapped, the gap between the flange portion of the joint member A and the convex portion of the hollow joint member B is set to 0.05 to 0.5 mm. The

  In addition, according to one of the other desirable embodiments in the method for manufacturing a joined product according to the present invention, the joining member A is obtained by chamfering a corner portion located on the inner side in the opposing direction of the flange portion. Used.

  Furthermore, according to one of the other preferable aspects in the manufacturing method of the joined product according to the present invention, a chamfering angle formed between the end surface of the flange portion and the surface formed by the chamfering process is 15 ° to 45 °. In addition, by the chamfering process, the thickness of the front end portion of the flange portion is made 80% or less of the original thickness.

  And in this invention, with respect to the joining member A of the structure in which the flat-plate-shaped flange part extended mutually and parallelly is formed integrally, between the opposing flange parts, it mutually opposes and is parallel. It is the joining structure formed by fitting the end part of the hollow joining member B which has a face plate part located, and carrying out friction stir welding, Comprising: As said hollow joining member B, several provided respectively between the opposing surfaces of the said face plate part The face plate portions are integrally connected to each other by the ribs, and a plurality of convex portions whose tip portions are flattened on the outer surface of the portion of the face plate portion where the plurality of ribs are disposed. The members formed integrally along the ribs are used, and the hollow joint member B is fitted between the flange portions of the joint member A at the end to be joined. Of the flange part and the hollow joint member B In a state in which the plate portions are overlapped with each other, the joining member A and the hollow joining member B are overlapped and friction stir welded along the convex portion of the hollow joining member B, so that a plurality of joining portions are hollow. The gist of the joining structure is characterized by being formed so as to extend in the longitudinal direction of the joining member B.

  As described above, in the method for manufacturing a bonded product according to the present invention, a flat flange portion extending in parallel and facing each other is integrally formed as one bonding member to be bonded. While the member A is used, the other joining member has face plate portions that face each other and are parallel to each other, and each face plate portion is integrally formed by a plurality of ribs provided between the facing surfaces. And a convex portion whose tip is flattened on the outer surface (surface opposite to the surface on which the ribs are formed) of each face plate portion where the plurality of ribs are disposed. However, the hollow joining member B integrally formed along each of the plurality of ribs is used. For this reason, when the friction stir welding is carried out by fitting the hollow joint member B between the flange parts of the joint member A and superimposing the flange parts of the joint member A and the face plate parts of the hollow joint member B, respectively. The surface pressure at the time of joining concentrates on each convex part of the flattened front-end | tip part, and it can join without being influenced by the flatness of each faceplate part. As a result, a joined product having a sound joint can be advantageously produced.

  In the present invention, the probe of the friction stir welding tool is inserted through the flange portion of the joining member A into each convex portion formed on the surface of the hollow joining member B opposite to the surface on which the rib is formed. Thus, even if the core is not disposed in the hollow portion of the hollow joint member B, the rib plays the role of a backing jig such as the core, and the occurrence of buckling can be advantageously prevented. It has become. Therefore, the operation of inserting the core into the hollow portion becomes unnecessary, and the friction stir welding can be easily performed.

  And in this invention, each convex part formed in the outer surface of the faceplate part of the hollow joining member B becomes a mark, and the site | part in which the rib was arrange | positioned can be confirmed easily also from the outside. Benefits are also enjoyed.

  In addition, in the present invention, each face plate portion arranged opposite to each other is formed with a plurality of convex portions, so that each face plate portion and each flange portion overlapped with each face plate portion are respectively at a plurality of locations. It is designed to be joined together. As a result, it is possible to manufacture a strong bonded product with further improved bonding reliability.

  Moreover, in the joining structure according to this invention, since the face plate part which the hollow joining member B opposes is overlapped and joined to the flange part of the joining member A in each of a plurality of places, the above-described effects are obtained. It is enjoyed and the bonding reliability is improved.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, in FIG. 1 and FIG. 2, one embodiment of a joined product manufactured according to the present invention is schematically shown in a perspective form and a planar form, respectively. As is apparent from these drawings, the bonded product 10 is formed by joining the extruded member 12 with the flange, which is the joining member A, and the hollow extruded member 14 with the rib, which is the hollow joining member B, to each other. It has the structure formed.

  More specifically, the flanged extruded section 12 has a longitudinal square pipe-shaped base portion 13 as a whole, and outward (rightward in FIG. 1) from one side surface plate 18 c of the base portion 13. A pair of flat-plate-shaped flange portions 16a and 16b that extend in parallel to face each other so as to protrude toward each other are extruded shapes having a structure in which they are integrally provided with a predetermined interval in the vertical direction. Here, the thicknesses of the flange portions 16a and 16b are the same as the thicknesses of the upper and lower face plates 18a and 18b of the base portion 13, respectively, and the flange portion 16a and the upper surface plate 18a, and the flange portion 16b and the lower surface plate 18b are formed. , Respectively, are considered to be the same.

  The thickness and the protruding length of the flange portions 16a and 16b can be set as appropriate and are not particularly limited. However, the thickness is at least a friction stir welding from the viewpoint of performing lap joining. It is necessary to make it smaller than the length of the probe of the friction stir welding tool used for this, and here it is about 1 to 5 mm. Moreover, since the protrusion length of the flange parts 16a and 16b is too short, since the joining length of a joining part cannot fully be ensured and there exists a possibility that joining strength may fall, here, It is about 10-50 mm.

  On the other hand, the hollow extruded shape 14 with the ribs joined to the extruded shape 12 with the flange is an extruded shape having a hollow structure having a rectangular cross section as a whole. More specifically, a cross-sectional view of the bonded product 10 is shown in FIG. 3, but the hollow extruded profiles 14 with ribs are positioned parallel to each other at a predetermined interval in the vertical direction. A pair of flat face plate portions (upper surface plate portion 20a, lower surface plate portion 20b) and flat outer walls that respectively connect the end portions in the width direction (left and right direction in FIG. 3) of the upper and lower surface plate portions 20a and 20b. A plurality of (two in this case) connecting the upper and lower surface plate portions 20a and 20b provided substantially perpendicularly between the opposing surfaces of the portion (the left outer wall portion 22a and the right outer wall portion 22b) and the upper and lower surface plate portions 20a and 20b. Ribs 24a, 24b. Further, the ribs 24a and 24b are provided with a predetermined interval between the left and right outer wall portions 22a and 22b. Therefore, the hollow extruded profile 14 with ribs has two inner wall-shaped ribs. 24a and 24b are in a state of being partitioned into three parts, and the cross-sectional shape thereof is substantially a “eye” shape (in FIG. 3, the “eye” character is rotated by 90 °). .

  In the present embodiment, the thicknesses of the ribs 24a and 24b: Ta and Tb are set to be 2 mm or more larger than the probe diameter R of the friction stir welding tool used in the friction stir welding, respectively. . As a specific example, when the diameter of the probe to be used is 2.5 mm, the thicknesses of the ribs 24a and 24b: Ta and Tb are set to be 4.5 mm (= 2.5 mm + 2 mm) or more. It is. This is because the stirring region by friction stir welding is generally 2 mm or more than the diameter of the probe: R. For example, when the thickness of the ribs 24a and 24b is less than R + 2 mm, the stirring region is the rib. When reaching 24a and 24b, the friction-stirred metal swells or protrudes to each connecting portion (corner portion) 26 between the ribs 24a and 24b of the ribbed hollow extruded member 14 and the upper and lower plate portions 20a and 20b. As a result, a metal shortage occurs in the joint portion 28, thereby forming an incomplete joint portion by forming a porosity or a cavity inside the joint portion 28, and achieving a desired sufficient joint strength. This is because there is a risk of not. Further, even when the stirring region does not reach the ribs 24a and 24b, if the ribs 24a and 24b are too thin, the load applied at the time of joining cannot be endured and there is a possibility of buckling.

  Furthermore, in the present embodiment, from the viewpoint of reducing the weight of the bonded product 10, the total thickness (Ta + Tb) of the ribs 24a and 24b is equal to or less than ½ of the distance D between the opposing surfaces of the left and right outer wall portions 22a and 22b. It is set to become.

  The rib-shaped hollow extruded member 14 has two convex portions (projections) 30 on the outer surfaces of the upper and lower surface plate portions 20a and 20b corresponding to the portions where the ribs 24a and 24b are formed. , Which are integrally provided so as to extend along the ribs 24a and 24b in the longitudinal direction (the direction perpendicular to the paper surface in FIG. 3 and the left-right direction in FIG. 2). Each of the linear joints 28 is formed by inserting a probe of the friction stir welding tool. As for each convex part 30 provided in this hollow extrusion-shaped member 14 with a rib, the front-end | tip part 31 is planarized so that it may expand and show in FIG. For this reason, during the friction stir welding, the pressing force from the friction stir welding tool can be advantageously received by the flattened projecting end surface, and the surface pressure at the time of joining is concentrated on each convex portion 30 and the profile is flat. It becomes possible to join without depending on the degree (flatness of the upper and lower plate portions 20a, 20b), and as a result, a joined product having a sound joined portion is manufactured.

  Note that the shape and size of each convex portion 30 is appropriately set according to the probe of the friction stir welding tool to be used. Here, the surface pressure during friction stir welding is set to each convex portion. From the point which concentrates on 30, the shape of each convex part 30 is made into the cross-sectional square shape, especially cross-sectional rectangular shape. Further, the widths Wa and Wb in the cross section of each convex portion 30 are set to be 2 mm or more larger than the diameter R of the probe of the friction stir welding tool used in the friction stir welding. This is because the stirring region by friction stir welding is generally 2 mm or more than the probe diameter: R. When the widths Wa, Wb in the cross section of each convex portion 30 are less than R + 2 mm, The friction-stirred metal escapes toward the gaps 32 formed between the face plates 20a and 20b and the flanges 16a and 16b of the flanged extruded profile 12 to cause meat leakage, As a result, a shortage of metal occurs in the joints 28, thereby forming incomplete joints by forming porosity and cavities in the joints 28, and a desired sufficient joint strength. This is because it may not be obtained.

  Further, it is desirable that the widths Wa and Wb of the respective protrusions 30 are equal to or smaller than the corresponding rib thicknesses Ta and Tb in order to obtain a sound joint. Because, if the width: Wa, Wb of each convex portion 30 is too large compared to the rib thickness: Ta, Tb, the probe of the friction stir welding tool can be inserted with the convex portion 30 as a mark. The insertion position of the probe of the friction stir welding tool may deviate from the position where the ribs 24a and 24b are disposed. As a result, the load at the time of joining cannot be supported by the ribs 24a and 24b, and the ribbed hollow This is because the extruded shape member 14 is buckled, and there is a possibility that a sound joint cannot be obtained.

  Furthermore, here, the protruding height H of each convex portion 30 provided on the same face plate portion prevents rattling after fitting, and the hollow extruded shape member 14 with ribs is formed of the extruded shape member 12 with flange. Both are set to the same height so that they can be stably disposed between the flange portions 16a and 16b. Although this protrusion height: H is not particularly limited, it is generally desirable that the protrusion height is about 0.15 to 0.5 mm in order to obtain the effect of the convex portion 30 advantageously.

  Note that the flanged extruded shape 12 and the ribbed hollow extruded shape 14 may be of the same material or different materials. Further, the material of these shapes is not particularly limited, and examples thereof include known materials capable of friction stir welding such as aluminum, aluminum alloy, magnesium, magnesium alloy, copper, and copper alloy. The materials are appropriately selected and used. Among them, particularly when an aluminum alloy is employed, Al—Cu—Mg (2000 series), Al—Mg—Si (6000 series), Al, which can increase strength by aging treatment. -Zn-Mg (7000 series) heat-treatable Al alloy can be advantageously used.

  Thus, in order to manufacture the joined product 10 according to the present embodiment using the flanged extruded shape 12 and the ribbed hollow extruded shape 14 as described above, for example, the following method is used. .

  First, an extruded profile 12 with a flange and a hollow extruded profile 14 with a rib are prepared, and as shown in FIG. 5, the opposing directions of the flange portions 16a and 16b are in the vertical direction. The flanged extruded shape 12 and the rib-shaped hollow extruded shape 14 are arranged so that the upper and lower surface plate portions 20a, 20b on which the convex portions 30 are formed are positioned vertically. Then, either one or both of them are moved relatively so that the cut surface 34 has an end portion to be joined of the hollow extruded shape member 14 with ribs between the flange portions 16a, 16b of the extruded shape member 12 with flange. The flanged extruded shape 12 and the hollow extruded shape 14 with ribs are assembled by being fitted until they are brought into contact with the side plate 18c of the flanged extruded shape 12 (see FIG. 6). Here, the cut surface 34 of the rib-shaped hollow extruded member 14 is perpendicular to any of the upper and lower plate portions 20a and 20b and the left and right outer wall portions 22a and 22b. When the cut surface 34 of the profile 14 is brought into contact with the side plate 18c of the flanged extruded profile 12, the hollow extruded profile 14 with ribs is arranged at a right angle with respect to the extruded profile 12 with flange. It has become. Further, by inserting the hollow extruded shape member 14 with ribs between the flange portions 16a and 16b arranged above and below, as shown in FIG. 6, the flange portion 16a, the upper surface plate portion 20a, and the lower surface plate portion 20b. And the flange portion 16b are overlapped with each other in the fitted portion. At this time, the upper and lower surface plate portions 20a and 20b of the inserted hollow extruded profile 14 with ribs are provided with a plurality of convex portions 30 at predetermined intervals in the width direction. Unlike the case where only one is provided, the ribbed hollow extruded section 14 is advantageously prevented from rattling between the flange portions 16a, 16b.

  When the hollow extruded profile 14 with ribs is fitted, the distance between the opposing surfaces of the flange portions 16a and 16b is such that the hollow extruded profile 14 with ribs can be easily inserted. It is desirable to be larger than the outer dimension (the distance from the tip portion 31 of the convex portion 30 provided on the upper surface plate portion 20a to the tip portion 31 of the convex portion 30 provided on the lower surface plate portion 20b). More specifically, when the ribbed hollow extruded shape 14 is fitted between the flange portions 16a and 16b of the flanged extruded shape 12, the inner surface of the flange portion 16a and the convex portion 30 of the upper surface plate portion 20a. The size of the gap (clearance) between the projecting end faces: G (see FIGS. 7 and 8) is desirably 0.05 to 0.5 mm, more preferably 0.05 to 0.3 mm. The reason is that if the gap size G is less than 0.05, it is difficult to fit the ribbed hollow extruded shape 14 between the flange portions 16a and 16b, and 0.5 mm. This is because the friction stir metal escapes from the gap at the time of friction stir welding, and there is a risk of insufficient metal.

  Then, the upper and lower surface plate portions 20a and 20b are fitted between the flange portions 16a and 16b of the flanged extruded shape member 12, and the flange portions 16a and 16b and the upper and lower surface plate portions 20a and 20b are overlapped with each other. It fixes with fixing means (not shown), such as a clamp, so that 12 and the hollow extrusion shape member 14 with a rib may not move mutually. Next, the friction stir welding is performed in the same manner as in the past using the friction stir welding tool 36 similar to the conventional one. Here, as the friction stir welding tool 36, a tool provided with a pin-shaped probe 40 having a predetermined length coaxially and integrally provided at the tip of a rod-shaped shoulder member 38 is used. As shown in FIGS. 7 and 8, the friction stir welding tool 36 is moved toward the ribs 24a and 24b of the hollow extruded profile 14 with ribs while rotating at high speed around its axis. By doing so, the probe 40 of the friction stir welding tool 36 is pressed from the outer surface side of the flange portions 16a, 16b of the extruded shape member 12 with flange, and the front end surface (shoulder surface) of the shoulder member 38 is the flange portions 16a, 16b. It is inserted until it comes into contact with the outer surface. As a result, the probe 40 was formed in the upper and lower surface plate portions 20a and 20b of the hollow extruded profile 14 with ribs through the flange portions 16a and 16b in the thickness direction as shown in an enlarged view in FIG. It will be inserted into each convex part 30. At this time, the convex portions 30 of the portions superimposed on the flange portions 16a and 16b cannot be visually recognized due to the presence of the flange portions 16a and 16b. However, the convex portions 30 are arranged in the longitudinal direction of the hollow extruded profile 14 with ribs. From the portion that is formed over the entire length, each convex portion 30 can be visually recognized with respect to a portion that is not fitted between the flange portions 16a and 16b, and this serves as a mark, and the outside of the flange portions 16a and 16b. The probe 40 can be easily inserted into the convex portions 30 through the flange portions 16a and 16b without marking on the surface.

  Then, by inserting the probe 40, the contact portion between the probe 40 rotated at high speed and the flange portions 16a, 16b and the convex portions 30, and the shoulder surface of the shoulder member 38 rotated at high speed and the shoulder surface are pressed. Friction heat is generated at the contact portions with the flange portions 16a and 16b, and the surroundings are plasticized and plastically flowed. On the other hand, the two shapes overlapped by the stirring action accompanying the high-speed rotation of the probe 40. The structure of the material is mixed and mixed, and the friction stir zone 42 is formed around the probe 40. Subsequently, with the probe 40 inserted, the friction stir welding tool 36 (probe 40) is moved along each convex portion 30. Relatively moving in the extending direction of each protrusion 30 (longitudinal direction of the hollow extruded profile 14 with ribs), the friction stir zone 42 is By forming so as to extend in the extending direction of the convex portion 30, and the extruded shape member 12 with flange and ribbed hollow extruded shape member 14 is of being a line joining. By such a friction stir welding operation, the extruded shape 12 with flange and the hollow extruded shape 14 with ribs are lap-joined at the fitted portion, and the desired joining as shown in FIGS. The product 10 is manufactured.

  In the joined product 10 manufactured in this way, a plurality of (two) joining portions 28 extending in the longitudinal direction of the hollow extruded profile 14 with ribs are formed above and below the flange portions 16a and 16b. Therefore, the reliability of the bonding is improved extremely advantageously.

  Therefore, the joining product and joining structure of the present invention obtained by friction stir welding the joining member A and the hollow joining member B as described above are, for example, automobile space frames, railway vehicles, building panel frames, and the like. It is advantageously used for structural members that require rigidity.

  By the way, the present invention is not construed as being limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention. The form is shown in FIGS. 10 to 14, members and parts having the same structure as those in the above embodiment are given the same reference numerals as those in the above embodiment, and detailed descriptions thereof are given. Omitted.

  First, FIG. 10 schematically shows another embodiment of a bonded product manufactured in accordance with the present invention in perspective form. As is apparent from FIG. 10, the joined product 45 is a rib that is a hollow joint member B between the flange portions 46a and 46b of the flanged extruded member 44 that is the joint member A, as in the above embodiment. One end of the hollow extruded profile 48 is fitted, and the flanges 46a, 46b and the hollow extruded profile 48 with ribs are overlapped, and friction stir welding is applied to the overlapped portion. It has a structure.

  Here, as is apparent from FIG. 10, as the flanged extruded shape 44, the flanges 46a and 46b project outward from the side plates 18c of the long square pipe-shaped base 13 at the front ends in the projecting direction. Among the positioned corners, the corners on the inner side in the opposing direction of the flanges 46a and 46b are chamfered. For this reason, the insertion operation at the time of inserting the edge part of the hollow extrusion shape member 48 with a rib between the flanged extrusion shape members 44 flange part 46a, 46b can be performed very easily.

  As shown in FIG. 11, the chamfering of the corner is performed by the chamfering angle: θ of 15 ° between the end surface on the front end side in the protruding direction of the flange portions 46a and 46b and the surface formed by the chamfering. It is desirable to be performed so as to be ˜45 °. The reason for this is that when θ exceeds 45 °, the machining allowance is large, cutting becomes difficult, and the flange portions 46a and 46b are deeply cut off in the protruding direction (left and right direction in FIG. 11). This is because the joint length of the friction stir welding is shortened by the amount of the chamfering process, and the joint strength is reduced. If the angle is less than 15 °, the effect cannot be obtained even if chamfering is performed. That is, there is no influence on the ease of fitting the ribbed hollow extruded shape 48 between the flange portions 46a and 46b. This is because it is the same as the state where chamfering is not performed. Further, it is desirable that the chamfering is performed so that the thickness P of the tips of the flange portions 46a and 46b is 80% or less (substantially more than 0%) of the original thickness Q. This is because even when the thickness of the tip: P exceeds 80% of the original thickness: Q, the effect cannot be obtained even if chamfering is performed as in the case where θ is less than 15 °. .

  Further, in the present embodiment, as shown in FIG. 12, the rib extruded hollow 48 is formed on the outer surface of the upper and lower plate portions 20a, 20b provided with the ribs 24a, 24b with the rectangular cross section of the above embodiment. Unlike the convex part 30 having a shape, a structure in which a convex part 50 having a trapezoidal cross section is provided. Also in this embodiment, the tip of the convex portion 50 is flattened, and the surface pressure at the time of joining is concentrated on each convex portion 50 as in the above-described embodiment, and is affected by the flatness of the profile. Thus, friction stir welding can be performed.

The size of each convex portion 50 is also set for the same reason as in the above embodiment, and the upper base (width of the tip portion): Wa ₁ and Wb ₁ in the trapezoidal cross section is the friction used in the friction stir welding, respectively. The diameter of the probe of the stir welding tool is 2 mm or more larger than R, and the corresponding rib thickness is equal to or smaller than Ta and Tb.

Further, the lower bottom (base width): Wa ₂ , Wb ₂ is made larger than the upper bottom: Wa ₁ , Wb _{1 in} order to receive the surface pressure from the upper bottom side advantageously. This is because if the lower base (the width of the base): Wa ₂ , Wb ₂ is trapezoidal and smaller than the upper base: Wa ₁ , Wb ₁ , poor bonding may occur. . Furthermore, the lower base (the width of the base): The upper limit of Wa ₂ and Wb ₂ is the width of the base of the plurality of convex portions 50 in each of the face plate portions 20a and 20b, similarly to the upper limit of the thickness of the ribs 24a and 24b described above. (W ₂ + Wb ₂ ) is set to be equal to or less than ½ of the distance D between the opposing surfaces of the left and right outer wall portions 22a and 22b.

  In the present embodiment, in addition to the outer surface portions of the upper and lower surface plate portions 20a and 20b corresponding to the portions where the ribs 24a and 24b are formed, the upper and lower portions corresponding to the portions where the left and right outer wall portions 22a and 22b are formed. Convex portions 52 having a trapezoidal cross section extending in the longitudinal direction of the ribbed hollow extruded member 48 are respectively formed on the outer surface portions of the face plate portions 20a and 20b. Thereby, in the hollow extruded shape member 48 with ribs, four convex portions are formed on each face plate portion (20a, 20b). Further, the protruding height H of each of the convex portions 50 and 52 is set to the same height (about 0.15 to 0.5 mm) in order to prevent rattling.

  Then, in order to obtain the joined product 45 shown in FIG. 10 by friction stir welding of the flanged extruded shape 44 and the ribbed hollow extruded shape 48, the friction stir welding is performed in the same manner as in the above embodiment. However, in this embodiment, after fitting the hollow extruded profile 48 with the rib into the extruded profile 44 with the flange, prior to performing the friction stir welding operation, they do not move relative to each other. In addition, temporary fixing is performed by TIG welding, MIG welding, or the like. By this temporary fixing, it is possible to effectively prevent the flanged extruded profile 44 and the ribbed hollow extruded profile 48 from relatively moving, and the friction stir welding can be performed more advantageously. It is. In this embodiment, as shown in FIG. 10, the temporary fixing is performed by performing spot welding on the overlapping portion of the tip portions of the flange portions 46 a and 46 b and the convex portions 50 and 52. The welding part 54 is formed in that part.

  In this embodiment as well, the hollow extruded shape member 48 with ribs is inserted between the flange portions 46a and 46b of the extruded shape member 44 with flange in a part in the longitudinal direction. The protrusions 50 and 52 of the hollow extruded profile 48 with ribs that are not fitted between 46a and 46b serve as marks, and the protrusions 50 and 52 (the ribs 24a and 24b and the left and right outer walls) through the flanges 46a and 46b. The probe 40 of the friction stir welding tool 36 is inserted toward the portions 22a and 22b), and the friction stir welding can be easily performed.

  Moreover, in this embodiment, the friction stir welding is performed not only in the portions corresponding to the ribs 24a and 24b but also in the portions corresponding to the left and right outer wall portions 22a and 22b. Is enhanced even more effectively.

  On the other hand, FIG. 13 schematically shows still another embodiment of a joined product manufactured according to the invention in a planar form. As apparent from FIG. 13, the joined product 56 is a rib that is a hollow joining member B between the flange portions 16 a and 16 b of the flanged extruded member 12 that is the joining member A, as in the above embodiment. The hollow extruded profile 58 has a structure in which one end portion of the hollow extruded profile 58 is fitted and is subjected to overlap friction stir welding. Here, the ribbed hollow extruded profile 58 is an extruded profile with a flange. The twelve flange portions 16a and 16b are joined in a state of being inserted obliquely rather than at a right angle.

  More specifically, in this embodiment, a hollow extruded member that is cut obliquely at a predetermined angle is used as the hollow joint member B. In other words, the angle formed by the cut surface 60 and the surfaces of the upper and lower surface plate portions 20a and 20b is a right angle, the angle formed by the cut surface 60 and the left outer wall portion 22a is an obtuse angle, and the cut surface 60 and the right outer wall portion 22b. A hollow extruded section that has been cut so that the angle between the surface and the surface is an acute angle is used. For this reason, when the cut surface 60 of the hollow extruded profile 58 with ribs is brought into contact with the side plate 18c of the extruded profile 12 with flange, as shown in FIG. The rib-shaped hollow extruded shape member 58 is disposed in an obliquely inclined state.

  Also in this embodiment, since the hollow extruded shape member 58 with ribs is fitted between the flange portions 16a and 16b of the extruded shape member 12 with flange in a part in the longitudinal direction, the flange portions 16a and 16b Each convex part 30 of the hollow extruded shape member 58 with ribs not fitted between 16b serves as a mark, and the probe 40 is easily inserted into each convex part 30 through the flange parts 16a and 16b, and friction stir welding is performed. It has been implemented. Also in the present embodiment, since a plurality of joining portions 28 extending in the longitudinal direction of the hollow extruded shape member 58 with ribs are formed above and below the flange portions 16a and 16b, the reliability of joining. Is raised very advantageously.

  Furthermore, FIG. 14 schematically shows another embodiment of a bonded product manufactured according to the invention in a planar form. 14 also has a ribbed hollow extruded member 14 as a hollow joint member B between the flange portions 16a and 16b of the flanged extruded member 12 as a joining member A in the longitudinal direction. Friction stir welding is performed in a state where a part is inserted and overlapped, and here, the hollow extruded profile 14 with ribs is arranged in parallel to the extruded profile 12 with flange. More specifically, in the present embodiment, friction is caused in a state where the left outer wall portion 22a of the hollow extruded profile 14 with the ribs is in contact with the side plate 18c of the extruded profile 12 with the flanges, not the cut surface 34. Stir welding is applied.

  Also in the present embodiment, the rib-shaped hollow extruded member 14 is inserted between the flange portions 16a and 16b of the flange-shaped extruded member 12 in a part in the longitudinal direction thereof. , 16b, the protrusions 30 of the hollow extruded profile 14 with ribs are marks, and the probe 40 is easily inserted into the protrusions 30 (ribs 24a, 24b) through the flanges 16a, 16b. Thus, friction stir welding is performed. Further, since the joining portions 28 extending in the longitudinal direction of the hollow extruded shape member 58 with ribs are formed on the upper and lower sides of the flange portions 16a and 16b, respectively, the joining reliability is also advantageously improved. is there.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, as the joining member A, the plate-like flange portions 16a and 16b are integrally provided so as to protrude outward from the one side plate 18c of the long square pipe-like base portion 13. Extruded profiles with the following structure were used, but in addition to wrought materials such as extruded profiles, castings can be used as long as they have a structure with flat flanges that extend in parallel to face each other. There is no problem even if it is made of wood. Further, the shape of the joining member A is not limited to the above example. For example, it is possible to adopt a member having an H-shaped cross section, for example.

  Moreover, in the said embodiment, although the square pipe-shaped hollow extrusion shape (extrusion shape by which the cross-sectional shape of the outer wall part was a rectangular shape) was employ | adopted as a hollow joining member B as a whole, it mutually opposes If the face plate portions positioned in parallel are integrally connected by a plurality of ribs, the overall shape is not limited to a rectangular shape, and the left and right outer wall portions However, even if it has a curved surface (the outer wall has a substantially oval cross-sectional shape), or the left and right side walls have a cross-section “<” shape (the outer wall has a substantially cross-sectional shape). Of course, even hexagonal ones can be used.

  Further, the number of ribs 24a and 24b is not limited in any way. If at least two or more ribs 24a and 24b are formed, a plurality of joint portions corresponding to the number of ribs can be formed. Therefore, it is possible to manufacture a bonded product with higher reliability than in the past. When n ribs are provided (n is an integer of 2 or more), the total thickness of the n ribs is the distance between the opposing surfaces of the left and right outer wall portions (or the inner width of the upper and lower surface plate portions): It is desirable to set it so that it is 1/2 or less of D. This is because, if it exceeds 1 / 2D, the merit of using a hollow shape may be lost, and in particular, when the total thickness is about the same as D, it is the same as adopting a solid shape. Because it will end up.

  Furthermore, in the above example, the flange portions 16a and 16b of the extruded shape member 12 with the flange and the upper and lower surface plate portions 20a and 20b of the hollow extruded shape portion 14 with the rib are overlapped in the vertical direction. The hollow extruded shape member 14 with ribs is inserted horizontally between the disposed flange portions 16a and 16b. However, the extruded shape member 12 with flange is set so that the opposing direction of the flange portions 16a and 16b is the horizontal direction. Of course, it is possible to place the rib-shaped hollow extruded shape member 14 in the vertical direction and fit it. Even in this case, the gap G between the inner surface of the flange portion and the protruding end surface of the convex portion is 0.05 to 0.5 mm, more preferably 0.05 to 0.3 mm, respectively. It is desirable.

  In addition, in the above example, the probe 40 is inserted without marking on the outer surfaces of the flange portions 16a and 16b with the respective convex portions 30 of the portions not inserted between the flange portions 16a and 16b as marks. Although the friction stir welding is performed, it is possible to perform the friction stir welding by marking on the outer surfaces of the flange portions 16a and 16b. In the present invention, unlike the conventional one, such a mark can be attached very easily, and as a result, the lap friction stir welding can be carried out with extremely good workability.

  Also, as the friction stir welding tool 36, any of various known rotary tools used for friction stir welding can be appropriately selected and used. In addition, in addition to the shoulder member 38 and the probe 40 having an integral structure, the shoulder member 38 and the probe 40 are configured separately, and each is separately movable in the axial direction. Even in a double-acting rotary tool having a coaxially combined structure, it can be advantageously used. As such a double-acting rotary tool, various known tools are appropriately selected and used.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

  Several examples of the present invention will be shown below to clarify the present invention more specifically. However, the present invention is not limited by the description of such examples.

  In Examples 1 to 3 and Comparative Example 1 below, as a friction stir welding tool, a probe having a probe diameter of 2.5 mm and a probe length of 5 mm is provided at the tip of a shoulder member (shoulder diameter: 8 mm). While using a concentric rotating tool, friction stir welding was performed under the conditions of a rotational speed of 1000 rpm and a feed rate of 500 mm / min.

First, an extruded profile made of an aluminum alloy (6063-T4) having a substantially “H” cross section as shown in FIG. In addition, each dimension of the joining member A was as follows.
<Joint member A>
Projection length of upper flange part (a): 24.5 mm
Projection length of the lower flange (b): 24.5 mm
Distance between opposing surfaces of upper and lower flanges (c): 49.5 mm
Upper and lower flange width (d): 48.5 mm
Thickness (total thickness including upper and lower flanges): 3 mm

  On the other hand, a hollow extruded member made of an aluminum alloy (6063-T4) having two ribs (inner walls) and having a substantially “mesh” cross section was prepared as the hollow joining member B. Specifically, in Examples 1 to 3, as the hollow bonding member B, the trapezoid (Examples 1 and 2) or the rectangle (Example 3) are respectively formed on the outer surfaces of the portions where the ribs of the upper and lower plate portions are disposed. ) In which a convex portion having a cross-sectional shape was formed, while in Comparative Example 1, a shape member in which no convex portion was formed was prepared. The dimensions of the hollow joint member B according to Examples 1 to 3 and Comparative Example 1 are shown in Table 1 below.

  And as FIG. 15 shows, one end part of the hollow joining member B which concerns on Examples 1-3 and Comparative Example 1 is inserted between the flange parts of the said joining member A, and the flange of the joining member A And the face plate portion on which the convex portions of the hollow joining member B were formed were overlapped. Then, after fixing them so that the joining member A and the hollow joining member B do not move each other, the probe of the friction stir welding tool that rotates at high speed is inserted into each convex part through the flange part. Friction stir welding was performed by moving along the extending direction.

  As a result, in Examples 1 to 3 using the hollow joint member B in which the convex portion is formed, the convex portion is used as a mark and the friction is generated along the rib without marking the outer surface of the flange portion. In contrast to Comparative Example 1 using the hollow joint member B having no protrusions, while the stir welding was able to be performed, if the mark was not added, the formation site of the rib was not known, and a considerable amount of time was taken for the friction stir welding. It cost.

  Moreover, the joining products according to Examples 1 to 3 using the hollow joining member B formed with the convex portions have a sound joint portion without causing defects such as buckling and incompletely joined portions. The bonding reliability was extremely high. On the other hand, in the joined product according to Comparative Example 1 using the hollow joining member B having no convex portion, the contact portion is unevenly affected due to the flatness of the hollow joining member B, and therefore, there is a gap in the joining portion. A portion with a large (clearance) is likely to occur, and the friction-stirred metal escapes from the gap, causing a shortage of metal.

Further, the corner portion located on the inner side in the opposite direction of the flange portion of the joining member A employed in the above embodiment is chamfered as shown in the following 1) to 5) and used in the above embodiment 2. The hollow joint member B was inserted and the ease of insertion was evaluated.
1) Chamfering angle θ: 45 °, thickness of tip after chamfering: 2.4 mm (80% of the original)
2) Chamfering angle θ: 45 °, thickness of tip after chamfering: approximately 0 mm (approximately 0% of the original)
3) Chamfering angle θ: 15 °, thickness of tip after chamfering: 2.4 mm (80% of the original)
4) Chamfering angle θ: 45 °, thickness of tip after chamfering: 2.55 mm (85% of the original)
5) Chamfering angle θ: 50 °, thickness of tip after chamfering: 1.5 mm (50% of the original)

  As a result, in the above cases 1) to 3), the hollow joining member B could be inserted more smoothly than when chamfering was not performed. On the other hand, the cases 4) and 5) were not much different from the case where chamfering was not performed.

It is perspective explanatory drawing which shows partially an example of the joining product manufactured according to this invention. It is a plane explanatory view in FIG. FIG. 3 is an explanatory view taken along the line III-III in FIG. 2. It is a partial expanded sectional explanatory view of the hollow joining member B used for manufacture of the joining product shown by FIG. FIG. 2 is a perspective explanatory view showing an example of a manufacturing process of the joined product shown in FIG. 1, and shows a state before the end portion of the hollow joint member B is fitted between the flange portions of the joint member A. FIG. 5 is a perspective explanatory view showing another example of the manufacturing process of the joined product shown in FIG. 1, and shows a state in which the end of the hollow joint member B is fitted between the flange portions of the joint member A. It is front explanatory drawing which shows another example of the manufacturing process of the joining product shown by FIG. 1, Comprising: The state before the probe of a friction stir welding tool is inserted with respect to the overlap part of a flange part and a faceplate part. Show. It is VIII-VIII cross-section explanatory drawing in FIG. It is a partial expanded sectional explanatory view which shows another example of the manufacturing process of the joining product shown by FIG. 1, Comprising: The state where the probe of the friction stir welding tool was inserted is shown. It is a perspective explanatory view partially showing other examples of the joined product manufactured according to the present invention. It is a partial expanded sectional explanatory view which shows the front-end | tip of the flange part shown by FIG. It is a partial expanded sectional explanatory view of the hollow joining member B used for manufacture of the joining product shown by FIG. It is a plane explanatory view partially showing another example of the joined product manufactured according to the present invention. It is a perspective explanatory view partially showing still another example of the joined product manufactured according to the present invention. It is an isometric view explanatory drawing which shows the joining product manufactured in the Example.

Explanation of symbols

10, 56, 62 Joined product 12, 44 Extruded profile with flange 13 Base 14, 48, 58 Hollow extruded profile with rib 16a, 16b, 46a, 46b Flange 18a, 18b, 18c Base face plate 20a, 20b Upper and lower plate Portions 22a, 22b Left and right outer wall portions 24a, 24b Rib 26 Corner portion 28 Joint portion 30, 50, 52 Convex portion 31 Tip portion 32 Cavity portion 34, 60 Cut surface 36 Friction stir welding tool 38 Shoulder member 40 Probe 42 Friction stir zone 54 welded part

Claims (7)

A hollow member having a face plate portion that is located opposite and parallel to each other between the opposing flange portions, with respect to the joining member A having a structure in which flat plate-like flange portions that extend in parallel and face each other are integrally formed. The end of the joining member B is fitted, friction stir joined, and a method for producing a joined product composed of these two kinds of joining members,
As the hollow joint member B, the face plate portions are integrally connected by a plurality of ribs provided between the opposing surfaces of the face plate portion, and the ribs of the face plate portion are disposed. On the outer surface of the above-mentioned part, using the shape member in which the convex part whose tip part is flattened is integrally formed along the plurality of ribs, the end part to be joined of the hollow joining member B is After being fitted between the flange portions of the joining member A and overlapping the flange portion of the joining member A and the face plate portion of the hollow joining member B, the probe of the friction stir welding tool is moved under high speed rotation. Through the flange portion of the joining member A, it is inserted into each of the projecting portions of the hollow joining member B and moved along each of the projecting portions, whereby the joining friction member of the joining member A and the hollow joining member B is friction stir welded. The length of the hollow joint member B is Method for producing a bonded product and forming a plurality of joints extending direction.   Each of the convex portions provided on the face plate portion of the hollow joining member B has a rectangular cross section or a trapezoidal cross section, and the width of the tip portion of each convex portion is 2 mm larger than the diameter of the probe. 2. The method for manufacturing a joined product according to claim 1, wherein the width of the base portion of each convex portion is equal to or larger than the width of the tip portion while being larger than the thickness of the rib. .   The thickness of each rib of the hollow joint member B is 2 mm or more larger than the diameter of the probe, and the total thickness of each rib is 1 of the distance between the outer wall portions connecting the face plate portions of the hollow joint member B. The manufacturing method of the joining product of Claim 1 or Claim 2 made into / 2 or less.   When the hollow joint member B formed with the convex portions is inserted between the flange parts of the joint member A, and the flange part of the joint member A and the face plate part of the hollow joint member B are respectively overlapped, The manufacturing of the joined product according to any one of claims 1 to 3, wherein a gap between the flange portion of the joining member A and the convex portion of the hollow joining member B is 0.05 to 0.5 mm. Method.   The manufacturing method of the joining product of any one of Claim 1 thru | or 4 which uses what gave the chamfering to the corner | angular part located in the opposing direction inner side of the said flange part as said joining member A.   The chamfering angle formed between the end face of the flange part and the surface formed by the chamfering process is 15 ° to 45 °, and the chamfering process allows the thickness of the front end part of the flange part to be the original thickness. The method for manufacturing a joined product according to claim 5, which is 80% or less. A hollow member having a face plate portion that is located opposite and parallel to each other between the opposing flange portions, with respect to the joining member A having a structure in which flat plate-like flange portions that extend in parallel and face each other are integrally formed. A joining structure formed by fitting the end of the joining member B and performing friction stir welding,
As the hollow joining member B, the face plate portions are integrally connected by a plurality of ribs respectively provided between opposing faces of the face plate portion, and the ribs of the face plate portion are disposed. On the outer surface of the formed portion, a shape member in which convex portions whose tip portions are flattened are integrally formed along the plurality of ribs is used, and the hollow joining member B is an end to be joined. In the state where the flange portion of the joining member A and the face plate portion of the hollow joining member B are overlapped with each other in a state where the joining member A and the hollow joining member are overlapped with each other. B is overlapped and friction stir welded along the convex portion of the hollow joint member B, and a plurality of joint portions are formed to extend in the longitudinal direction of the hollow joint member B. Construction.

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