JP2007160373A - Method of fitting member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of fitting a member free from concern about the bulging, loosening, falling or the like of projections constraining designing. <P>SOLUTION: Into a fitting hole 3 of a first material 1, the distal end side of a bolt 5 provided with a flange part having an external diameter larger than that of the same at the proximal end side is inserted. A second material 2 is superimposed on the first material 1. A welding tool having a reverse U-shaped cross section provided with a recessed part 7 having an internal diameter larger than that of the flange part 4 is pressed against the second material 2 while being rotated. The second material 2 around the flange part 4 in a solid phase state is locally softened by the friction heat and the welding tool 8 is sank therein, and the welding tool 8 is pressed also against the first material 1; thus the first material 1 is softened, and further, the boundary part 9 between the first material 1 and the second material 2 is stirred. Further, the second material 2 in the recessed part 7 is softened by the whole of the inside face in the recessed part 7 of the welding tool 8 to bury the flange part 4 in the softened part. After that, the welding tool 8 is pulled out, and the boundary part 9 is hardened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for attaching a member.

  In recent years, in the automobile industry, lightweight materials such as aluminum have been actively adopted from the viewpoint of reducing the weight of vehicles with the aim of improving fuel efficiency, etc., which makes it difficult to weld different materials such as aluminum and iron. The importance of attaching and fixing each other is increasing.

  For example, as shown in FIG. 5, conventionally, when an iron (steel) bolt b is to be attached to an aluminum base material a, the bolt b is welded to an iron (steel) setting plate c. In addition, it was necessary to take measures such as fastening the setting plate c to the aluminum base material a with bolts d and nuts e.

In addition, there exists following patent document 1 etc. as prior art document information relevant to the attachment method of the member of this invention mentioned later.
JP 2004-136365 A

  However, when the bolt fastening with the setting plate c as described above is adopted, the bolts d and nuts elongate as projections on the front and back surfaces of the base material a, so the space occupied by these projections is designed. In addition, there is a restriction that it must be secured above, and there are also concerns about loosening and dropping off when fastening with bolts d and nuts e.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for attaching a member that does not have to worry about overhanging projections, loosening, dropping off, or the like, which is a design constraint.

  The present invention inserts the distal end side of a mounted member having a flange portion having an outer diameter larger than the mounting hole on the base end side with respect to the mounting hole previously drilled in the first material, A second material is overlapped so as to cover the flange portion, and a reverse U-shaped cross-section joining tool provided with a recess having an inner diameter larger than the flange portion on the opposite surface to the second material side is concentric with the flange portion. The second material around the flange portion is locally softened in a solid state by frictional heat generated between the second material and the welding tool while being rotated and placed on the second material. The joining tool is allowed to settle until it reaches the first material, and the joining tool is pressed against the first material to locally soften the first material in a solid state by frictional heat, thereby While stirring the boundary portion with the second material, the joining tool The second material in the recess is softened in a solid state by frictional heat on the entire inner surface of the recess of the recess to bury the flange, and then the joining tool is pulled out to harden the boundary portion. Then, the member to be attached is fixed to the first material and the second material.

  Thus, in this way, the second material around the flange portion is friction stir welded (abbreviated as FSW) to the first material. The flange part buried in between is firmly clamped to achieve good fixing of the mounted member to the first material and the second material, while the tip side of the mounted member projects from the mounting hole of the first material. It becomes a usable state.

  At this time, the flange portion of the mounted member is buried and fixed between the first material and the second material, and projections such as bolts and nuts in the case of bolt fastening are the first material and the first material. Because it does not overhang from two materials, there are no design restrictions such as securing the space occupied by this type of protrusion, and there is a concern about loosening and falling off when using bolt fastening. Also disappear.

  In the present invention, it is preferable that a projection is formed in advance on the surface facing the first material of the flange portion, and the projection is fitted on the first material side softened by frictional heat. If so, the movement of the flange portion around the shaft center is restricted by the insertion of the protruding portion on the first material side, and the effect of preventing rotation of the attached member is exerted on the first material and the second material. become.

  According to the above-described member mounting method of the present invention, the following various excellent effects can be obtained.

  (I) According to the invention described in claim 1 of the present invention, since there is no protrusion of a projection such as a bolt or a nut in the case of bolt fastening, design restrictions can be relieved greatly, and the bolt It is possible to eliminate concerns about loosening and dropping off as in the case of fastening.

  (II) According to the invention described in claim 2 of the present invention, the fixed member can be reliably prevented from rotating with respect to the first material and the second material. Even if it exists, sufficient torque intensity | strength can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show an example of an embodiment for carrying out the present invention. In this embodiment, the first material 1 and the second material 2 made of aluminum are used as a base material, and the two-layer base material is made of iron. The case where the bolt 5 (attached member) of (made of steel) is attached is illustrated.

  As shown in FIG. 1, the first material 1 is provided with a mounting hole 3 penetrating in the thickness direction, and a bolt 5 having a flange portion 4 having an outer diameter larger than the mounting hole 3 on the base end side. The distal end side is inserted into the mounting hole 3, and the second material 2 is overlaid on the first material 1 so as to cover the flange portion 4. On the material 2 side, a jig 6 having a pit portion 6a capable of accommodating the tip end side of the bolt 5 is disposed.

  In the example shown here, a plurality of protrusions 5a are formed on the lower surface (facing surface facing the first material 1) of the flange portion 4 of the bolt 5 at predetermined intervals in the circumferential direction. ing.

  Further, on the upper side of the second material 2, a joining tool 8 having an inverted U-shaped cross section in which a concave portion 7 having an inner diameter larger than that of the flange portion 4 of the bolt 5 is formed on the lower surface (opposite surface to the first material 1 side). It arrange | positions concentrically with the said flange part 4, and is rotatably supported by the joining apparatus which is not shown in figure so that raising / lowering is possible.

  And in attaching the bolt 5 with respect to the 1st material 1 and the 2nd material 2 which were piled up in this way, it descends, rotating the joining tool 8 as shown in FIG. 2 from the state of FIG. The welding tool is pressed against the second material 2 and locally softened in the solid state while the second material 2 around the flange portion 4 is caused by frictional heat generated between the second material 2 and the welding tool 8. 8 is allowed to settle until it reaches the first material 1.

  Next, as shown in FIG. 3, when the first material 1 is locally softened in a solid state by frictional heat by pressing the lower end portion of the welding tool 8 against the first material 1, 1 and the second material 2 are agitated at the boundary portion 9, and at the same time, the second material 2 in the concave portion 7 is in a solid state by frictional heat on the entire inner surface of the concave portion 7 of the welding tool 8. The flange portion 4 is buried by being softened as it is, and the protrusions 5a on the lower surface of the flange portion 4 are inserted into the first material 1 side softened by frictional heat.

  Thereafter, as shown in FIG. 4, when the joining tool 8 is pulled upward to cure the boundary portion 9, the second material 2 around the flange portion 4 is friction-stir welded to the first material 1 (Friction Stir). Welding: Abbreviated as FSW), the flange portion 4 buried between the first material 1 and the second material 2 is firmly held, and the bolt 5 is good against the first material 1 and the second material 2 On the other hand, the front end side of the bolt 5 protrudes from the mounting hole 3 of the first material 1 and can be used.

  At this time, the flange portion 4 of the bolt 5 is buried and fixed between the first material 1 and the second material 2, and projections such as bolts and nuts in the case of bolt fastening are used as the first material. Since it does not overhang from the first material 2 and the second material 2, there is no restriction on the design such as securing the space occupied by this kind of protrusion, and the looseness and the bolt fastening are not applied. There is no need to worry about dropping out.

  Further, the protrusions 5 a on the lower surface of the flange portion 4 are fitted on the first material 1 side, so that the movement of the flange portion 4 around the axis is restricted, and the bolts with respect to the first material 1 and the second material 2 are bolted. The effect of detent of 5 is exhibited.

  Therefore, according to the above-described embodiment, since there is no protrusion of a bolt or nut in the case of bolt fastening, the design restrictions can be greatly eased, and the looseness or drop-off as in the case of bolt fastening can be achieved. In addition, since the bolt 5 can be reliably prevented from rotating with respect to the first material 1 and the second material 2, sufficient torque strength can be imparted to the bolt 5. Can do.

  In addition, the attachment method of the member of this invention is not limited only to the above-mentioned example, The 1st material and the 2nd material do not necessarily need to be the same kind material, and a different material may be sufficient, Further, the attached member does not necessarily have to be a bolt and may be a socket type nut or the like, and the first material and the second material are locally softened in a solid state by frictional heat. Of course, a polymer material or the like can be appropriately employed in addition to the metal material, and various modifications can be made without departing from the scope of the present invention.

It is sectional drawing which shows an example of the form which implements this invention. It is sectional drawing which shows the state which descended, rotating the joining tool of FIG. It is sectional drawing which shows the state which further lowered | hung the welding tool from the state of FIG. It is sectional drawing which shows the state which pulled up the joining tool from the state of FIG. It is sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st material 2 2nd material 3 Mounting hole 4 Flange part 5 Bolt (attachment member)
5a Protruding part 6 Jig 6a Pit part 7 Recessed part 8 Joining tool 9 Boundary part

Claims (2)

  With respect to the mounting hole previously drilled in the first material, the distal end side of the mounted member provided with a flange portion having an outer diameter larger than the mounting hole on the proximal end side is inserted, and the flange portion is inserted into the first material. The second material is overlapped so as to cover, and a welding tool having an inverted U-shaped cross section provided with a concave portion having an inner diameter larger than that of the flange portion on the opposite surface to the second material side is arranged concentrically with the flange portion. The second tool is pressed against the second material while rotating, and the second material around the flange portion is locally softened in a solid state by frictional heat generated between the second material and the welding tool. The material is allowed to settle until it reaches one material, and the first material is locally softened in a solid state by frictional heat by pressing the joining tool against the first material. And stir the boundary part of the The second material in the recess is softened in a solid phase state by frictional heat on the entire inner surface of the inner surface, so that the flange portion is buried, and then the joining tool is pulled out to harden the boundary portion. A mounting method for a member, wherein the mounting member is fixed to the first material and the second material.   The member according to claim 1, wherein a protrusion is formed in advance on a surface facing the first material side of the flange portion, and the protrusion is fitted on the first material side softened by frictional heat. Mounting method.

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