JP2007301576A - Stud joining method of component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of effectively suppressing or preventing occurrence of burrs to be discharged outwardly from an abutted part (a joined interface) of a component to be joined and a member to be joined when joining the component to a predetermined flat joining surface of the member by the plastic flow caused by the friction heat generation, and achieving the effective joining of the component with the member. <P>SOLUTION: When a screw member 2 to be joined is joined to the joining surface of a plate 6 by using the plastic flow caused by the friction heat generation, a clamp cylinder 8 is arranged closely around the screw member 2 to be joined, and the joining operation is performed in a state that the joining surface of the plate 6 is pressed by the clamp cylinder 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for joining parts to a stud, and in particular, by using plastic flow caused by frictional heat generation on a flat surface of a member to be joined such as a screw (bolt) or a nut. The present invention relates to a method for joining.

  Conventionally, in applications such as automobiles, various vehicles, building materials, etc., parts such as screws (bolts) and nuts are attached to a predetermined flat surface of a member to be joined, and are connected to other members via those parts. The structure has been adopted. For example, attaching a screw or nut as a boss to a plate material and fastening it to other members is often performed in a steel monocoque body of a steel plate, where there is stud welding or projection welding. Screws and nuts are attached.

  Thus, stud welding is a method in which a protrusion is formed on the bottom surface of the screw and an arc is blown between the plate materials to be joined and melted and pressed. ing. In particular, when the material of the plate material is aluminum, the amount of burrs increases because the material is soft. In addition, projection welding is a type of resistance welding in which protrusions are provided on the bottom surfaces of screws and nuts, brought into contact with the plate material to be joined, and current is passed to melt at the contact point with the highest current density. However, when aluminum is used as the material, a large current is required for a short time because of its good electrical and thermal conductivity, so that projection welding is extremely difficult. -ing

  On the other hand, as one method for joining such parts such as screws and nuts to a flat surface of a predetermined member, a technique using friction stir welding is disclosed in Japanese Patent Application Laid-Open No. 2002-153969 (Patent). It is made clear in the literature 1). In this case, the nut material made of aluminum is rotated and brought into contact with the base material made of aluminum, and friction stir is generated in the contact portion, so that the friction between the nut and the base material does not occur. Stir welding is possible. And, in addition to short-time bonding, ensuring the required bonding strength, heat input, distortion reduction, flatness, surface roughness, material strength before bonding can be maintained, stable bonding conditions It has been clarified that advantages such as being obtained can be enjoyed.

  However, when joining a nut and a plate using such a friction stir welding method, the nut and rotating tool rotate at the same time. In addition to deteriorating the aesthetics of the product, in some cases, burrs may fall off and cause problems during handling or use of the resulting bonded product. In addition, since the agitated metal is discharged as burrs, the plastic flow region in the base material (plate material) is reduced, and there is a limitation in obtaining sufficient bonding strength. Therefore, when joining parts such as screws and nuts to a plate-shaped base material, it is necessary to minimize the occurrence of such burrs.

Japanese Patent Laid-Open No. 2002-153979

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is that a predetermined component to be bonded is subjected to predetermined flow of a member to be bonded by plastic flow due to frictional heat generation. It is an object of the present invention to provide a stud joining method for advantageously joining a flat joining surface of a metal, and another object of the present invention is to provide a contact between a component to be joined and a member to be joined. To effectively suppress or prevent the generation of burrs discharged outward from the contact area (bonding interface), and to provide a technique that enables effective bonding between these parts and the member to be bonded. There is also.

  In the present invention, in order to solve the above-described problem, a predetermined part to be joined is constrained by a rotary tool and rotated around the center line of the part, while the predetermined part of the member to be joined is restrained. Abutting against and pressing against the flat joining surface of the member, frictional heat is generated, and plastic flow is induced in the part joining part of the joined member, and the part is inserted into the joined member, When joining the member to be joined, an annular or cylindrical pressing member is arranged so as to be close to the parts to be joined, and the joining surface of the member to be joined is arranged by the pressing member. A component stud joining method characterized by suppressing burrs discharged outward from the joining interface between the parts and the members to be joined by performing the joining operation in a pressed state. , That It is an gist.

  According to one of the preferred embodiments of the component stud joining method according to the present invention, a backing jig is disposed on the back side of the part joining portion of the member to be joined, and the backing jig and the pressing member The member to be joined is configured to be sandwiched between them, whereby the member to be joined can be fixed and the part joining portion can be easily positioned.

  According to another preferred embodiment of the method according to the present invention, a stirring protrusion is provided on the joining surface of the parts to be joined, and the plastic flow at the part joining site of the joined member is The friction stir action by the stirring protrusion can be further increased. In other words, such a stirring protrusion is inserted into the member to be joined to impart a friction stirring action, thereby causing a more effective plastic flow.

  In the present invention, as the parts to be joined, generally, a bolt-like (screw-like) or nut-like article is a target, and such an article is a predetermined member of a member to be joined such as a plate material or a profile. It can be advantageously bonded to the flat bonding surface.

  According to one of the other desirable embodiments according to the present invention, the parts to be joined are nut-shaped articles, and the stirring rod penetrates the central hole of the nut-shaped articles and protrudes from the nut-shaped articles. Is provided integrally with the rotating jig, and at the time of joining, the tip part of the stirring rod part protruding from the nut-like article is inserted into the part joining part of the member to be joined. A plastic flow based on the friction stir action by the stir rod portion is caused to occur at the component joining portion. Such a stirrer rod provided integrally with the rotating jig is inserted into the part joining part of the member to be joined at the same time by the forward operation of the rotating jig, and a friction stir action is applied. Thus, the plastic flow at the part joining site can be more effectively performed, and the joining of the nut-like article to the member to be joined can be performed effectively.

  Furthermore, according to another one of the other desirable modes according to the present invention, the parts to be joined are nut-like articles, and the parts joining sites of the joined members to which the nut-like articles are joined are as follows: While a through-hole is provided corresponding to the central hole of the nut-shaped article, the center of the nut-shaped article passes through the through-hole with respect to a backing jig disposed on the back side of the component joining portion. An inner presser rod portion that is inserted into the hole is provided integrally, and the joining operation is performed under the condition that the inner presser rod portion is inserted from the through hole into the central hole. Due to the presence of the inner pressing rod portion, it is possible to exert an effective suppressing effect against burrs that enter the center hole of the nut-shaped article.

  In addition, according to the present invention, advantageously, after the joining operation is finished, the pressing member is retracted so that the pressure on the joining surface of the joined member is released, and the joining surface is removed from the joining surface. Then, the rotary tool is retracted to release the pressing action of the component against the bonding surface of the bonded member by the rotating tool, and the component is fixed and remains on the bonding surface of the bonded member. The configuration to be made will be adopted. Thus, the pressing member can be prevented from adhering, and the pressing member can be advantageously detached from the component joining portion of the member to be joined.

  In the present invention, as the member to be joined, an aluminum material is advantageously used, and specifically, an aluminum plate or an aluminum shape is targeted.

  Therefore, according to the stud joining method for parts according to the present invention as described above, a tubular or cylindrical pressing member is used, and in such a state that the bonding surface of the member to be bonded is pressed with such a pressing member, The parts to be joined are accommodated in the inner space of the pressing member and are rotated by a rotary tool while being brought into contact with the member to be joined. Since the joining between the members to be joined is performed, the burrs discharged outward from the contact portions between the parts and the members to be joined are placed on the pressing member positioned so as to surround the periphery thereof. Therefore, the presence of burrs in the resulting bonded product is reduced, so that the aesthetics of the bonded product can be improved as well as such a bonded product. During product handling and use, also the problem that is caused by the falling of burrs from the product, effectively avoided or are became a fact that may reduce.

  Moreover, in the stud joining method according to the present invention, as described above, the generation of burrs from the joining interface between the part and the member to be joined can be effectively suppressed. The reduction of the metal at the joining portion can be advantageously suppressed or prevented, and therefore, the plastic flow region generated in the joined member can be effectively reduced or prevented. A bonded product having sufficient bonding strength, that is, a product in which a target component is bonded to a predetermined portion of a member to be bonded can be advantageously obtained.

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

  First, FIG. 1 shows the arrangement state of each member in the process in an example of the stud joining method according to the present invention in a cross-sectional form, where (a) shows a state before the start of a joining operation due to frictional heat generation, Further, (b) shows a state immediately before the end of the joining operation, and (c) clarifies an example of a constraint form between the parts to be joined and the rotary tool. In these drawings, the screw member 2 as a component to be joined is made of aluminum or the like made of aluminum or an alloy thereof as a member to be joined while being rotated in a state of being restrained by the rotary tool 4. A clamp which is a tubular or cylindrical pressing member so as to be in contact with the plate member 6 to be pressed and further pressed against the plate member 6 and to be positioned in the vicinity of the screw member 2 constrained by the rotary tool 4 A cylindrical body 8 is arranged so as to press the plate surface of the plate material 6, and the plate material 6 is sandwiched and fixed between a thick plate-shaped backing jig 10 arranged on the back side of the plate material 6. It has become possible to squeeze.

  Specifically, as shown in the drawing, the screw member 2 is positioned in the clamp cylinder 8 in a form in which the screw portion 2a is on the top and the head portion 2b is on the bottom. Further, as is apparent from FIG. 1C, four locking recesses 2c are respectively provided in the circumferential direction with a phase difference of 90 ° on the screw portion 2a side of the head portion 2b of the screw member 2. They are arranged at a predetermined interval. Furthermore, a stirring protrusion 12 having a short columnar shape is integrally provided at the front end surface (the lower surface in the drawing) of the head portion 2b facing the plate member 6 at the center.

  Further, the rotary tool 4 has a rotating cylinder part 4a that can be rotated at a high speed around an axis by a rotation drive mechanism (not shown), and a tip part of the rotating cylinder part 4a (in the drawing) As shown in FIG. 1 (c), four locking protrusions 4 b positioned at a predetermined distance in the circumferential direction with a phase difference of 90 ° are formed on the lower portion of the screw member 2. It is arranged in such a size that it can be fitted into the locking recess 2c provided in the portion 2b.

  Then, the locking projection 4b provided at the tip of the rotary cylinder 4a of the rotary tool 4 is fitted into the locking recess 2c provided at the head 2b of the screw member 2, and the rotary cylinder 4a. In the state where the screw member 2 is constrained at, the screw member 2 is also rotated at a high speed around its axis (center line) by rotating the rotating cylinder 4a around the axis at a high speed. It is possible to be harassed.

  Further, here, the clamp cylinder 8 is made of a material harder than the screw member 2 and the plate member 6, for example, iron and the like, and between the outer peripheral surface of the head 2 b having the maximum outer diameter of the screw member 2. In addition, it is arranged as close as possible with a gap that does not contact even at high speed rotation, that is, with an inner diameter slightly larger than the outer diameter of the head 2b, which is the maximum outer diameter of the screw member 2. At the same time, the surface of the plate member 6 is pressed by a predetermined pressing mechanism (not shown), and the bonding interface between the screw member 2 and the plate member 6, that is, the lower surface of the head 2 b of the screw member 2 and the upper surface of the plate member 6. It is possible to suppress or prevent burrs from being discharged outwardly from the (surface).

  Therefore, when the screw member 2 is joined to the predetermined joining portion of the plate 6 on the head 2b side, the clamp cylinder 8 is lowered (advanced) as shown in FIG. In the state where the plate member 6 is held between the backing cylinder 10 and the position of the plate member 6 is fixed by being brought into contact with the plate member 6 and fixed in position, the rotary tool 4 The screw member 2 restrained and held by the rotating cylinder 4a is rotated at a high speed by the rotary tool 4, and the screw member 2 is rotated around its axis, while the rotary tool 4 moves forward (moves downward in the figure). ) To abut against the surface (joint surface) of the plate material 6 and further press the frictional heat generation action between the stirring projection 12 and further the top surface (lower surface) of the head 2b and the plate material 6, Friction stir zone 14 plastically flowing to plate 6 In addition, by inserting the head 2b of the screw member 2 into the friction stir zone 14 thus formed to a predetermined depth, a good joint between the screw member 2 and the plate member 6 can be obtained. However, it will be realized.

  In such a joining operation between the screw member 2 and the plate member 6, the screw member 2 can be rotated as close as possible to the periphery of the head 2b of the screw member 2 rotated about the axis. Since no clamp cylinder 8 is disposed and pressing the plate surface of the plate member 6, burrs discharged outward from the joint interface between the screw member 2 and the plate member 6 are effectively suppressed or As a result, the product aesthetics may be impaired, and the generated burrs may fall off during handling or use of the joined product (screw member 2 + plate material 6), causing problems. It can be effectively eliminated. In addition, since the discharge of burrs from the bonding interface between the screw member 2 and the plate material 6 can be suppressed or prevented, the plastic flow region (14) in the plate material 6 can be reduced. In other words, it is possible to advantageously avoid such a situation that it is possible to avoid such a problem and to limit the securing of sufficient bonding strength in the bonded product.

  In addition, in the screw member 2 to be joined to the plate material 6, the plasticity formed by the frictional heat generation between the head portion 2 b and the plate material 6 by providing the stirring protrusion 12 on the head portion 2 b. The flow region (14) becomes a larger plastic flow region by such a stirring action by the stirring protrusion 12, and thereby, the bonding strength between the screw member 2 and the plate member 6 can be further increased. It is like that.

  2 (a) to 2 (c), a nut 16 is used as a part to be joined in the form corresponding to FIGS. 1 (a) to 1 (c), and this is used as a predetermined joining portion of the plate member 6. Another example of a stud joining method according to the invention for joining to is schematically shown.

  In this case, the nuts 16 to be joined to the plate member 6 are provided with four members provided on the upper outer peripheral portion thereof with a phase difference of 90 ° in the circumferential direction, as is apparent from FIGS. 2 (a) to 2 (c). An annular stirring protrusion 18 having a predetermined width and continuously extending in the circumferential direction is lower than the plate thickness of the plate member 6 on the bottom surface facing the plate member 6 while having a recess. It is integrally provided at a height. And the latching protrusion 4b provided in the front-end | tip part of the rotary cylinder part 4a of the rotary tool 4 is fitted and latched with respect to the latching recess 16a of this nut 16, and, thereby, a nut In a state where the rotary tool 4 is constrained by the rotary tool 4, the rotary cylinder 4 a of the rotary tool 4 is rotated at a high speed around its axis so that the nut 16 is rotated integrally with the surface of the plate 6 ( The upper surface) and can be further pressed. As a result, as shown in FIG. 2 (b), frictional heat is generated between the nut 16 and the plate material 6 to induce plastic flow in the plate material 6, which is further stirred and flowed by the stirring protrusion 18. Thus, the effective friction stir zone 14 is formed to have an annular shape in plan view, so that the nut 16 can be effectively joined to the plate member 6.

  In addition, when the nut 16 and the plate material 6 are joined, the clamp cylinder 8 is placed around the nut 16 as close as possible so that the plate material 6 is sandwiched between the backing jig 10. , The burrs discharged outward from the joint interface between the nut 16 and the plate member 6 can be effectively suppressed or prevented. The occurrence of various problems due to the above can be advantageously avoided.

  Furthermore, FIG. 3 shows one embodiment of the present invention using a rotating tool different from the previous example. That is, the rotary tool 22 has a cylindrical rotary shaft portion 22a that is rotated at high speed around the axis by a rotary drive mechanism (not shown), and is concentrically arranged at the tip of the rotary shaft portion 22a. In addition, a small-diameter columnar stirring pin portion 22b having an outer diameter slightly smaller than the inner diameter of the screw hole 16b of the nut 16 is integrally formed. In addition, the stirring pin part 22b in this rotating shaft part 22a is comprised with the material whose hardness is higher than the board | plate material 6 in the front-end | tip part inserted in the board | plate material 6 at least.

  Then, the rotary tool 22 is fitted to the upper inner peripheral portion of the nut 16 to be joined at the outer peripheral end of the rotary shaft portion 22a in the same structure as in FIG. Constrained by the tool 22 and rotated about the axis integrally with the rotation around the axis of the rotary shaft portion 22a. On the other hand, the stirring pin portion 22b extending from the rotating shaft portion 22a passes through the screw hole 16b serving as the inner hole of the nut 16, and is configured to protrude downward from the bottom surface of the nut 16 by a predetermined length. The nut 16 constrained by the rotary tool 22 is rotated around its axis while being brought into contact with the plate material 6 and further pressed to generate frictional heat, and by the stirring pin portion 22b inserted. By causing an effective plastic flow by the friction stir action so that a large friction stir zone 24 is formed, the nut 16 is advantageously joined to the plate material 6.

  In addition, in another different embodiment of the present invention shown in FIG. 4, the backing jig 10 has a rod-like insertion pin portion 10 a having an outer diameter slightly smaller than the screw hole 16 b of the nut 16. It is erected integrally at a predetermined length. Then, in a form in which the insertion pin portion 10 a is inserted through the through hole 6 a provided in the plate material 6 and the screw hole 16 b of the nut 16, the nut 16 is restrained by the rotating cylinder portion 4 a of the rotary tool 4. In the state, while being rotated around the axis, the plate 6 is brought into contact with the plate 6 and further pressed, so that frictional heat is generated, and the plate 6 has the friction stir joint 20 similar to the embodiment of FIG. It is designed to be formed.

  Even in the case of the embodiment shown in FIGS. 3 and 4, the clamp cylinder 8 is arranged so as to be positioned near the nut 16 to be joined to the plate 6, and presses the plate 6. Therefore, it is possible to effectively suppress or prevent the burrs from being discharged outward from the joint interface between the nut 16 and the plate member 6. In addition, in the screw hole 16b of the nut 16, the stirring pin part 22b extending integrally from the rotating shaft part 22a and the insertion pin part 10a extending integrally from the backing jig 10 are provided on the inner periphery of the screw hole 16b. The insertion of the plasticized material from the friction stir zones 24 and 20 can be advantageously suppressed or prevented by being placed in an insertion position without forming a large gap between the surfaces. Thus, the discharge of burrs inside and outside the nut 16 can be effectively suppressed or prevented.

  In the illustrated embodiment of the present invention, the screw member 2 and the nut 16 are constrained by the rotary tools 4 and 22, and the screw member 2 and the nut 16 are brought into contact with the plate member 6, and further, the clamp cylinder. The order of operations such as pressing on the plate material 6 is not particularly limited, and is appropriately selected and adopted. For example, while the clamp cylinder 8 is pressed against the plate material 6, the rotary tools 4 and 22 constraining the screw member 2 and the nut 16 are rotated and inserted into the clamp cylinder 8 so as to contact and press against the plate material 6. In addition to the above method, after pressing and setting the clamp cylinder 8 against the plate member 6, the screw member 2 and the nut 16 are inserted or inserted into the clamp cylinder 8, and then the rotary tools 4 and 22 are installed. By inserting, locking, restraining and rotating the screw member 2 and the nut 16, the screw member 2 and the nut 16 are brought into contact with the surface of the plate 6 together with the method of performing the intended joining and the clamp cylinder 8. In the arranged state, it is possible to appropriately adopt a method of performing the intended joining by inserting the rotary tools 4 and 22 and locking, restraining and rotating the screw member 2 and the nut 16. Is possible.

  In the present invention, if the rotation of the rotary tools 4 and 22 is stopped after the joining operation as shown in FIGS. 1 to 4 is completed, the rotary tool 4 is removed from the screw member 2 and the nut 16. Further, the clamp cylinder 8 is brought into contact with the plate material 6 simultaneously with or before the release of the restraint of the screw member 2 and the nut 16 from the rotary tools 4 and 22. The clamp cylinder 8 is moved relative to the upper side of the plate 6 so that the pressure is released. In particular, in the present invention, as shown in FIG. It is desirable that the clamp cylinder 8 is released from the pressing of the plate material 6 prior to the retraction of 4.

  That is, FIG. 5 shows the form of detachment of the clamp cylinder 8 from the state shown in FIG. 1B in the embodiment shown in FIG. 1, in which the operation of joining the screw member 2 to the plate 6 is performed. Is finished, the clamp cylinder 8 is moved upward (retracted) and separated from the joining surface of the plate member 6 to release the pressure on the joining surface of the plate member 6. By retreating, the pressing action of the screw member 2 against the joining surface of the plate member 6 is released, so that the screw member 2 is fixed and left on the joining surface of the plate member 6. The rotation of the screw member 2 by the rotary tool 4 can be stopped after the clamp cylinder 8 is retracted. However, in order to enhance the effect of suppressing the generation of burrs, the clamp cylinder 8 is retracted. It is desirable to stop it in advance. The release of the clamp cylinder 8 prior to the release of the pressing action of the screw member 2 enables the clamp cylinder 8 to be detached from the plate material 6 more effectively.

  Although several embodiments of the present invention have been described in detail above, it is merely an example, and the present invention is not limited in any way by specific descriptions according to such embodiments. It should be understood that the interpretation is not intended.

  For example, as the parts to be joined, which are targeted in the present invention, in addition to the screw member 2 and the nut 16 as illustrated, bolts and the like can be rotated around a center line perpendicular to the joining surface. Any of these can be employed, and any member to be joined to such a component can be used as long as it has a flat joining surface in addition to the plate member 6 as illustrated. For example, it is possible to join a target part according to the present invention to a flat surface of an extruded profile.

  Moreover, as materials for the parts (2, 16) to be joined and the member (6) to be joined, various known materials can be adopted. In particular, in the present invention, aluminum is used. Alternatively, a relatively soft metal material such as an alloy thereof, copper, or an alloy thereof is advantageously used. 1 to 5, the bottom lines of the screw member 2 and the nut 16 and the outlines of the stirring protrusions 12 and 18 are shown by clear solid lines in the state where the friction stirring regions 14, 20 and 24 are formed. However, when the parts to be joined (2, 16) and the members to be joined (6) are made of materials having the same degree of hardness, such a clear solid line does not appear. A joining region in which these parts and the member to be joined are integrated is formed, and such a form is advantageously employed in the present invention.

  By the way, the clamp cylinder 8 which is a pressing member is pressed against the bonding surface of the plate member 6 which is a member to be bonded without being rotated as illustrated, while the rotating tool 4 is in the inner space. Since the screw member 2 and the nut 16 are rotated while being constrained with each other and the plate member 6 is joined, the pressing members such as the clamp cylinder 8 are joined to each other. It is desirable to be made of a material having higher hardness than the screw member 2, the nut 16 and the plate material 6 to be fastened, and the backing jig 10 is similarly made of a metal material having high hardness. It is supposed to be.

  Further, even if the parts (2, 16) to be joined are constrained by the rotary tool (4, 22), the screw member 2 and the nut 16 are connected to the rotary tool 4 in the concavo-convex fitting structure as illustrated. In addition to the structure in which the screw member 2 and the nut 16 that are to be joined are rotated by rotating the rotary tool 4 in addition to the structure in which the screw member 2 and the nut 16 are joined together. It is also possible to adopt a structure in which the cylindrical body portion 4a or the rotating shaft portion 22a is fixed and restrained.

  In addition, although not enumerated one by one, the present invention can be implemented in a mode to which various changes, modifications, improvements, and the like are added based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the present invention.

  In the following, typical examples of the present invention will be shown, and the present invention will be clarified more specifically. However, the present invention is subject to any restrictions by the description of such examples. Not to mention that it is also a matter of course.

<Example 1>
First, a screw (2) as shown in FIG. 1 was prepared as a part to be joined. That is, it is an M8 screw made of an aluminum alloy (2011-T6) in which the diameter of the head (2b) is 10 mm, the diameter of the stirring protrusion (12) is 3 mm, and the height is 0.3 mm. As a joining member, a 6000 series aluminum plate material (6016-T4) having a thickness of 1 mm was prepared.

  Then, in the same manner as in FIG. 1, the backing jig (10) is brought into contact with the lower surface serving as the back side of the aluminum plate material, while the outer surface has an outer diameter of 20 mm × inner diameter of 10.5 mm. After abutting the ring-shaped clamp (8) and sandwiching the load so that the load becomes 2 kN, the prepared screw (2) is attached to the tip of the rotary cylinder (4a) of the rotary tool (4) at its head. While gripping on the back side of the part and rotating at 2000 rpm, the head (2b) of the screw (2) is pressed against the aluminum plate (6) to generate heat by friction to cause plastic flow, while the head (2b ) Was controlled by pressing the load so as to be buried in the aluminum plate (6) at a depth of 0.1 mm, and the screws (2) and the aluminum plate (6) were joined.

  After the joining operation, the rotary tool (4) is retracted, the ring-shaped clamp (8) is further retracted, and they are removed. As a result, the screw (2) is effective against the aluminum plate (6). In addition, it was possible to obtain a bonded product that was bonded and hardly generated burrs around the head (2b) of the screw (2).

  In addition, in the screw-aluminum plate joint product thus obtained, the head (2b) of the screw (2) is subjected to a pressing force of a load of 2 kN in the surface direction of the aluminum plate (6). The joint interface between the screw and the aluminum plate was not broken at all, and the leg (2a) portion of the screw (2) was only bent 45 ° or more.

<Example 2>
As the member to be joined, the same aluminum plate (thickness: 1 mm) as in the case of Example 1 is used, and as the parts to be joined, the outer diameter is 15 mm, the inner diameter is 8 mm, and the length (height) is 10 mm. An M8 nut (16) made of an aluminum material (2011-T6) was prepared.

  Then, as shown in FIG. 2, the aluminum plate (6) is pressed by abutting and pressing the ring-shaped clamp (8) having an outer diameter: 25 mm and an inner diameter: 15.5 mm against the aluminum plate (6). The clamp (8) and the backing jig (10) are clamped and fixed, while the prepared nut is put into the clamp (8), and the nut is further inserted into the locking recess (16a). The locking projection (4b) provided at the tip of the rotating cylindrical body (4a) of the rotary tool (4) is fitted and rotated around the axis, whereby the nut (16) and the aluminum plate (6) The nut (16) and the aluminum plate (6) were joined together by forming a ring-shaped plastic flow region (20) by causing frictional heat generation therebetween.

  In the joined product thus obtained, almost no burrs were observed, and it was confirmed that the nut was firmly joined to the aluminum plate.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing which shows an example of the stud joining method of the components according to this invention, Comprising: (a) is sectional explanatory drawing which shows the state just before joining start, (b) is a cross section which shows the state just before completion | finish of joining. It is explanatory drawing, (c) is a disassembled perspective explanatory drawing which shows the latching restraint structure between the rotation cylinder part of a rotary tool, and a screw member. It is a schematic explanatory drawing which shows another example of the stud joining method of the components according to this invention, Comprising: (a) is sectional explanatory drawing which shows the state just before the joining operation start, (b) is just before completion | finish of joining operation. It is sectional explanatory drawing which shows a state, (c) is a disassembled perspective explanatory drawing which shows the latching restraint structure of a nut and the rotary cylinder part 4a of the rotary tool 4. FIG. It is sectional explanatory drawing corresponding to FIG.2 (b) which shows the further different example of the stud joining method of the components according to this invention. FIG. 8 is a cross-sectional explanatory view corresponding to FIG. 2B, showing still another example of a method for joining parts to a stud according to the present invention. In FIG.1 (b), it is cross-sectional explanatory drawing which shows an example of the press release of a clamp cylinder.

Explanation of symbols

2 Screw member 2a Screw part 2b Head 2c Locking recess 4 Rotating tool 4a Rotating cylinder part 4b Locking protrusion 6 Plate material 8 Clamp cylinder 10 Backing jig 12 Stirring protrusion 16 Nut 16a Locking recess 16b Screw hole 18 Stirring protrusions 20, 24 Friction stir joint 22a Rotating shaft 22b Stirring pin

Claims (8)

A predetermined part to be joined is constrained by a rotary tool and rotated around the center line of the part, while abutting against and pressing against a predetermined flat joining surface of a member to be joined, thereby generating frictional heat. Inducing the plastic flow in the part joining portion of the member to be joined, and inserting the part into the member to be joined to join the part and the member to be joined.
An annular or cylindrical pressing member is disposed so as to be positioned in the vicinity of the parts to be joined, and the joining is performed in a state where the joining surface of the joined member is pressed by the pressing member. A stud joining method for parts which is characterized by suppressing burrs discharged outward from the joining interface between the parts and the member to be joined by performing an operation.   A backing jig is disposed on the back side of the part joining portion of the member to be joined, and the member to be joined is sandwiched between the backing jig and the pressing member. The method for joining studs of parts according to claim 1.   Stirring protrusions are provided on the joint surfaces of the parts to be joined, and the plastic flow at the parts joining portion of the member to be joined is further increased by the friction stir action by the stirring protrusions. The method for joining studs of parts according to claim 1 or 2.   The method for joining parts according to any one of claims 1 to 3, wherein the parts to be joined are bolt-shaped or nut-shaped articles.   The part to be joined is a nut-shaped article, and a stirring rod portion that protrudes from the nut-shaped article through the center hole of the nut-shaped article is provided integrally with the rotating jig, At the time of joining, the tip portion of the stirring rod portion protruding from the nut-like article is inserted into the component joining portion of the member to be joined, and the plasticity based on the friction stir action by the stirring rod portion is inserted into the component joining portion. The method of joining a part according to any one of claims 1 to 4, wherein flow is induced.   The part to be joined is a nut-like article, and a through-hole is provided at a part joining portion of the member to be joined to which the nut-like article is joined, corresponding to the central hole of the nut-like article. On the other hand, an inner presser rod portion that is inserted into the center hole of the nut-like article through the through-hole is integrally provided with the backing jig disposed on the back side of the component joining portion, 5. The component stud joining method according to claim 1, wherein the joining operation is performed in a state in which a presser rod portion is inserted from the through hole into the central hole. .   After the joining operation is completed, the pressing member is retracted so as to release the pressure on the joining surface of the member to be joined, separated from the joining surface, and then the rotary tool is retracted to perform the rotation. 2. The pressing action of the part against the joining surface of the member to be joined by a tool is released, and the part is fixed and left on the joining surface of the member to be joined. Item 7. The method for joining studs of parts according to any one of Items 6 to 7. 8. The method for joining a part to a stud according to claim 1, wherein the member to be joined is made of an aluminum material.