JP4776372B2 - Mounting method of members - Google Patents

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 provided with a flange portion having an outer shape larger than the mounting hole on the proximal end side with respect to the mounting hole previously drilled in the first material, Friction heat generated between the second material and the welding tool by overlapping the second material so as to cover the flange and pressing the welding tool arranged in correspondence with the flange against the second material while rotating. Then, the second material around the flange portion is locally softened in a solid state to bury the flange portion, and the softened second material around the flange portion is brought into close contact with the surface of the first material. According to the present invention, there is provided a member attaching method, wherein the joining tool is pulled out and the second material around the flange portion is cured to fix the attached member to the first material and the second material.

  Thus, in this way, the second material around the flange portion softened in a solid state by frictional heat is brought into close contact with the first material and pressed under a temperature condition below the melting point, so that the bonding The first material and the second material are diffusion-bonded by the diffusion of atoms generated between the surfaces, and the buried flange portion is firmly held between the first material and the second material, and the first material of the mounted member On the other hand, good fixing to the second material is realized, while the tip end side of the attached member protrudes from the attachment hole of the first material to be usable.

  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.

  Furthermore, in the present invention, a joint hole having a groove on the inner surface is previously drilled at a position surrounding the mounting hole in the first material, and the joint hole in the second material superimposed on the first material is formed in the joint hole. The welding tool is rotated and pressed to a corresponding position, and the second material is locally softened in a solid state by frictional heat generated between the second material and the welding tool, thereby joining the first material. And forming an engaging portion that fits into the groove portion on the second material side that has entered the joining hole, and then pulling out the joining tool to cure the engaging portion and the first material and the second material. It is preferable to join the materials.

  If it does in this way, the second material which entered and hardened in the joint hole of the first material will form an engagement portion between the groove portion on the first material side, and the engagement portion and the groove portion will be fitted. As a result, the first material and the second material are firmly bonded to each other, so that the first material and the second material are firmly bonded at the position surrounding the mounting hole in the first material. If this is achieved, the fixing of the attached member to the first material and the second material will be greatly reinforced.

  In addition, the second material that enters the joint hole of the first material only forms an engaging portion with the first material side, and protrusions such as bolts and nuts project in the case of bolt fastening. Therefore, there are no design restrictions such as securing the space occupied by this type of projection, and there is no concern about loosening or dropping off when bolt fastening is employed.

  In addition, in the joining tool necessary to soften and enter the second material into the joining hole of the first material, the second material around the flange portion of the attached member is softened to the first material. Since it is possible to use also the joining tool for making it closely_contact | adhere, it becomes possible to implement | achieve fixation of the to-be-attached member and its reinforcement continuously, without replacing | exchanging a joining tool.

  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 first material and the second material can be firmly joined at a position surrounding the attachment hole of the first material. Since the fixing to the first material and the second material can be greatly reinforced, the fixing strength of the mounted member can be further improved, and the fixing of the mounted member can be performed without replacing the joining tool. Reinforcement can be realized continuously.

  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 distal end of a bolt 5 having a flange portion 4 having an outer shape larger than the mounting hole 3 on the proximal end side. The second material 2 is superposed on the first material 1 so as to cover the flange portion 4, and the lower surface side of the first material 1 (anti-second material) On the second 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 cylindrical joining tool 7 having an outer shape larger than the flange portion 4 of the bolt 5 is disposed concentrically with the joining hole 9, and is rotated by a joining device (not shown). It is supported so that it can be raised and lowered.

  In this embodiment, a joint hole 9 having a spiral (thread-like) groove portion 8 on the inner surface is previously drilled at a position surrounding the mounting hole 3 in the first material 1. A backing member 10 having a flat upper surface is disposed on the lower surface side of the one material 1 (on the side opposite to the second material 2) so that the lower end portion of the joint hole 9 can be closed.

  In the example shown here, the height dimension corresponding to the thickness dimension of the flange part 4 and the protrusion part 5a of the bolt 5 is located at the position facing the mounting hole 3 on the lower surface of the second material 2. Even when the concave portion 11 having an outer shape larger than the flange portion 4 is formed and the flange portion 4 and the protruding portion 5a are sandwiched between the first material 1 and the second material 2, most of the lower surface of the second material 2 Is in contact with the upper surface of the first material 1 so that no rattling occurs.

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 7 as shown in FIG. 2 from the state of FIG. The welding tool is pressed against the second material 2, and the second material 2 around the flange portion 4 is locally softened in a solid state by the frictional heat generated between the second material 2 and the welding tool 7. As shown in FIG. 3, the flange portion 4 is buried by the softened second material 2 around the flange portion 4 and is softened by frictional heat transmitted from the second material 2 side . Each protrusion 5a on the lower surface of the flange portion 4 is inserted into the one material 1 side.

  Further, the softened second material 2 around the flange portion 4 is brought into close contact with the surface of the first material 1 and is pressed under a temperature condition below the melting point, whereby the first diffusion of atoms generated between the joint surfaces occurs. Since the material 1 and the second material 2 are diffusion-bonded, after that, as shown in FIG. 4, the second material 2 around the flange portion 4 is cured by pulling the joining tool 7 upward. The flange portion 4 buried between the first material 1 and the second material 2 is firmly held, and the bolt 5 is secured to the first material 1 and the second material 2 while the bolt 5 The tip end side of the first material 1 protrudes from the mounting hole 3 of the first material 1 and is ready for use.

  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 embodiment, since there is no projection of a projection such as a bolt or a nut in the case of bolt fastening, the design restrictions can be relieved greatly, 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.

  Moreover, in the example shown here, since the joining hole 9 which provided the groove part 8 in the inner surface is previously drilled in the position surrounding the attachment hole 3 in the 1st material 1, it explains in full detail below. As described above, it is possible to reinforce the fixing of the bolt 5 by using the joint hole 9.

  That is, as shown in FIG. 1, the welding tool 7 is arranged above the position corresponding to the welding hole 9, and the lower end portion is lowered by rotating the welding tool 7 from the state shown in FIG. The material is pressed against the second material 2, and the second material 2 is locally softened in a solid state by frictional heat generated between the second material 2 and enters the bonding hole 9 of the first material 1.

  Next, as shown in FIG. 3, when the joining tool 7 is allowed to sink to a required depth, the second material 2 that has entered the joining hole 9 spreads over the entire area of the joining hole 9 by plastic flow and press-fitting, and the spiral of the joining hole 9. By engaging with the groove 8, a spiral (thread-like) engagement portion 12 is formed on the second material 2 side.

  Thereafter, as shown in FIG. 4, when the joining tool 7 is pulled upward to harden the engaging portion 12, the second material 2 that has entered and hardened into the joining hole 9 of the first material 1 becomes the first material. An engaging portion 12 is formed between the groove portion 8 on the first side, and the engagement between the engaging portion 12 and the groove portion 8 provides a retaining effect.

  Thus, when the second material 2 that has entered the bonding hole 9 of the first material 1 and hardened is engaged with the groove portion 8 on the first material 1 side, the engagement portion 12 is fitted. Therefore, the first material 1 and the second material 2 are firmly joined to each other, so that the first material 1 and the second material are positioned so as to surround the mounting hole 3 in the first material 1 in this way. If the firm joining with 2 is achieved, the fixing of the bolt 5 to the first material 1 and the second material 2 will be greatly reinforced.

  In addition, the second material 2 entering the joint hole 9 of the first material 1 only forms the engaging portion 12 between the first material 1 side, such as a bolt or nut in the case of bolt fastening. Since the protrusions do not overhang, there is no design restriction such as securing the space occupied by this kind of protrusions, and there are concerns about loosening and falling off when using bolt fastening. Nor.

  Further, the second material 2 around the flange portion 4 of the bolt 5 is softened in the joining tool 7 necessary for softening and entering the second material 2 into the joining hole 9 of the first material 1. Thus, since it is possible to use the joining tool 7 for bringing the first material 1 into close contact with each other, it is possible to continuously fix and reinforce the bolt 5 without replacing the joining tool 7.

  In FIG. 1 to FIG. 4, for convenience of explanation, the joining tool 7 softens the second material 2 into the joining hole 9 of the first material 1 and enters the joining tool 7. Although the process of softening the second material 2 around the flange portion 4 of the bolt 5 so as to be in close contact with the first material 1 is illustrated in parallel, each actual process is sequentially performed by one joining tool 7. Of course.

  Moreover, although the example illustrated in FIGS. 1 to 4 illustrates the case where the spiral groove portion 8 is threaded on the inner peripheral surface of the joint hole 9, the groove portion 8 is not necessarily formed in a spiral shape. For example, the ring-shaped groove 8 may be provided with a retaining effect.

  Therefore, if reinforcement using the joining hole 9 as described above is performed, the first material 1 and the second material 2 can be firmly joined at the position surrounding the mounting hole 3 of the first material 1. Thus, the fixing of the bolt 5 to the first material 1 and the second material 2 can be greatly reinforced, so that the fixing strength of the bolt 5 can be further improved and the bolt 5 can be replaced without replacing the joining tool 7. The fixing of 5 and its reinforcement can be realized continuously.

  In the case where the mounting holes 3 and the joining holes 9 in the first material 1 are continuously drilled so as to form a row in a direction perpendicular to the drawing, and a large number of bolts 5 are arranged in a direction perpendicular to the drawing. For example, the welding tool 7 pressed against the second material 2 while being rotated is moved in the direction in which the mounting hole 3 and the joining hole 9 are arranged, so that each flange portion 4 is continuously buried in the second material 2. It is also possible to continuously enter the second material 2 into each joint hole 9.

  In addition, when a large number of bolts 5 are mounted side by side in a direction perpendicular to the drawing in this way, the flange portions 4 of the respective bolts 5 are integrated as a common flange portion 4 extending long in the alignment direction, or the mounting holes 3 It is also possible to form the joint hole 9 in a slit shape extending in a direction perpendicular to the drawing.

  Moreover, 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 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 Projection part 7 Joining tool 8 Groove part 9 Joining hole 12 Engagement part

Claims (2)

  Insert the front end of the mounting member that has a flange with an outer shape larger than the mounting hole into the mounting hole that has been drilled in advance in the first material, and cover the flange with the first material. The second material is overlaid and pressed against the second material while rotating the joining tool arranged corresponding to the flange portion, and the flange portion is caused by frictional heat generated between the second material and the joining tool. The surrounding second material is locally softened in the solid state to bury the flange portion, and after the softened second material around the flange portion is brought into close contact with the surface of the first material, the joining tool is pulled out. A method for attaching a member, wherein the second material around the flange portion is cured to fix the member to be attached to the first material and the second material. A joint hole having a groove on the inner surface is previously drilled at a position surrounding the mounting hole in the first material, and a joint tool is placed at a position corresponding to the joint hole in the second material superimposed on the first material. Pressing while rotating, the second material is softened locally in the solid state by frictional heat generated between the second material and the joining tool, and enters the joining hole of the first material, the joining hole Forming an engagement portion that fits into the groove portion on the second material side that has entered, pulling out the joining tool, curing the engagement portion, and joining the first material and the second material The member mounting method according to claim 1, wherein the member is attached.

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