JP2018083329A - Heat calking structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat calking structure hardly generating rattle.SOLUTION: There is provide a heat calking structure 1 in which a first joining member 10 having a welding boss 12 and a second joining member 20 having an insertion hole 21 formed, the first joining member 10 has further a weld part 13 formed by heat calking a tip of a welding boss 12 inserted to the insertion hole 21, the insertion hole 21 has a small diameter part 22 formed on a first surface side and a large diameter part 23 having larger inner shape than the small diameter part 22 and formed on a second surface side when a surface in contact with the first joining member 10 is a first surface and a surface in an opposite side to the first surface is a second surface in the second joining member 20, the weld part 13 has a first heat calking part 14 in a space S1 between the welding boss 12 positioned in the insertion hole 21 and the large diameter part 23.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a thermal caulking structure formed by joining two members by thermal caulking.

  Conventionally, a heat caulking structure formed by joining two members by heat caulking is known. For example, in the heat caulking structure described in Patent Document 1, the rod portion (welding boss) of the object to be joined (first joining member) is inserted into the insertion hole provided in the joined member (second joining member). Then, the above-mentioned two members are joined by pressing a heated caulking tool against the tip of the bar portion.

Japanese Patent Laid-Open No. 2006-74126

  By the way, in the heat caulking structure as described above, the hole diameter of the rod part may be made smaller than the hole diameter of the insertion hole in order to easily insert the rod part into the insertion hole. In this case, since a gap is generated between the rod portion of the joining object joined by thermal caulking and the insertion hole of the joined member, the joining object joined by thermal caulking and the joined member are There is a risk of relative movement in a direction orthogonal to the axial direction of the insertion hole. That is, there is a possibility that rattling occurs between the object to be joined and the member to be joined after thermal crimping.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a thermal caulking structure in which rattling is unlikely to occur.

  A thermal caulking structure that solves the above problem is a thermal caulking structure in which a first joining member having a welding boss and a second joining member having an insertion hole are joined, wherein the first joining member is , Further having a fusion part formed by heat caulking the tip of the welding boss inserted through the insertion hole, and in the second joining member, the surface in contact with the first joining member is a first surface, When the surface opposite to the first surface is the second surface, the insertion hole has a small hole portion formed on the first surface side and an inner shape larger than the small hole portion, and the second hole A large hole portion formed on the surface side, and the melting portion includes a heat caulking portion in a space between the welding boss located in the insertion hole and the large hole portion.

  According to the said structure, the fusion | melting part (thermal caulking part) is formed when the welding boss | hub softened by the heat caulking flows into the space between the welding boss | hub and the said large hole part. That is, the space between the welding boss of the first joining member and the large hole portion of the second joining member is filled with the heat caulking portion. As a result, a gap is less likely to be generated between the first joining member and the second joining member, and the first joining member and the second joining member are relatively difficult to move in a direction orthogonal to the axial direction of the insertion hole. Become. Thus, according to the heat caulking structure of this configuration, it is possible to suppress the occurrence of rattling between the first joining member and the second joining member.

  In the thermal caulking structure, when the thermal caulking portion is the first thermal caulking portion, the melting portion is a second thermal caulking portion formed on the front end side of the welding boss by a thermal caulking tool. Furthermore, it is preferable that the second heat caulking portion is formed inside an opening edge in the second surface of the large hole portion.

  When the second caulking portion is formed by pressing the heat caulking tool against the tip of the welding boss, the softened welding boss flows along the heat caulking tool. For this reason, when the 2nd heat crimping part is large, compared with the case where the said 2nd heat crimping part is small, the welding boss | hub softened to the clearance gap between a welding boss | hub and a large hole part becomes difficult to flow. In this regard, according to the above configuration, the second heat caulking portion is formed inside the opening edge on the second surface of the large hole portion, and therefore the second heat caulking portion is formed so as to protrude from the opening edge. In comparison, it becomes easier to form the first heat caulking portion. Therefore, it can suppress that rattling arises in the 1st joining member and the 2nd joining member.

  In the thermal crimping structure, the large hole portion is preferably a tapered hole whose inner shape gradually increases from the first surface toward the second surface.

  According to the above configuration, the welding boss softened by heat caulking easily flows into the space between the welding boss and the large hole portion. That is, it becomes easier to form the heat caulking portion (first heat caulking portion).

  In the thermal caulking structure, it is preferable that at least one of a concave portion and a convex portion is formed on the wall surface of the large hole portion.

  According to the said structure, a heat crimping part (1st heat crimping part) is formed so that it may match the shape of the recessed part and convex part which were formed in the inner wall face of a large hole part. Therefore, it is possible to further suppress the occurrence of rattling between the first bonding member and the second bonding member. In particular, relative rotation of the first bonding member and the second bonding member around the axial direction of the insertion hole can be suppressed.

  In the thermal caulking structure, the large hole portion preferably has a non-circular cross-sectional shape in the axial direction of the insertion hole.

  According to the said structure, a heat crimping part (1st heat crimping part) is formed so that a cross-sectional shape may fit the shape of a non-circular large hole part. Therefore, it can suppress more that shakiness arises in the 1st joining member and the 2nd joining member. In particular, relative rotation of the first bonding member and the second bonding member around the axial direction of the insertion hole can be suppressed.

Sectional drawing before the heat crimping of the heat crimping structure in one Embodiment. Sectional drawing after thermal crimping of the said thermal crimping structure. The perspective view of the 1st junction member concerning the 1st modification. The perspective view of the 1st junction member concerning the 2nd modification. The perspective view of the 1st junction member concerning the 3rd modification. Sectional drawing before the heat crimping of the heat crimping structure which concerns on a 4th modification. Sectional drawing after thermal crimping of the said thermal crimping structure.

  Hereinafter, an embodiment of the heat caulking structure will be described.

  As shown in FIG. 1, the thermal caulking structure 1 includes a first joining member 10 and a second joining member 20.

  As shown in FIG. 1, the first joining member 10 includes a plate-like main body portion 11 and a columnar welding boss 12. Moreover, the 1st joining member 10 is formed with the thermoplastic resin, for example. The welding boss 12 protrudes in the thickness direction of the main body 11. Moreover, the main-body part 11 and the welding boss | hub 12 are integrally molded.

  As shown in FIG. 1, the 2nd joining member 20 has comprised plate shape. Moreover, the 2nd joining member 20 is formed with the metal, resin, or wood, for example. Further, an insertion hole 21 through which the welding boss 12 can be inserted is formed through the second bonding member 20. That is, the inner diameter of the insertion hole 21 is larger than the outer diameter of the welding boss 12. Further, the plate thickness of the insertion hole 21, that is, the depth of the insertion hole 21 is shorter than the length of the welding boss 12.

  The insertion hole 21 has a small diameter portion 22 as an example of a small hole portion having a relatively small inner diameter and a large diameter portion 23 as an example of a large hole portion having a relatively large inner diameter. In the second bonding member 20, when the surface in contact with the first bonding member 10 is the first surface and the surface opposite to the first surface is the second surface, the small-diameter portion 22 is provided on the first surface side and is large. The diameter portion 23 is provided on the second surface side. The small-diameter portion 22 is a round hole whose inner diameter does not change as it proceeds in the direction from the first surface to the second surface, and the large-diameter portion 23 as it proceeds in the direction from the first surface to the second surface. This is a tapered hole whose inner diameter gradually increases. The inner diameter of the large diameter portion 23 on the most first surface side is equal to the inner diameter of the small diameter portion 22. The inner diameter of the second surface of the large diameter portion 23 is larger than the inner diameter of the small diameter portion 22. In this regard, in this embodiment, the area of the hole in the second surface of the large diameter portion 23 is larger than the area of the hole in the small diameter portion 22, and the inner shape of the large diameter portion 23 is larger than the inner shape of the small diameter portion 22. It can be said that it is getting bigger.

  Next, as shown in FIG. 1, an operation when the first joining member 10 and the second joining member 20 are caulked with heat using a thermal caulking tool 50 will be described. In the present embodiment, the heat caulking tool 50 has a dome portion 51 that is a dome-shaped space, and an inner diameter of the opening edge of the dome portion 51 is smaller than an inner diameter of the opening edge 24 of the large diameter portion 23. It has become.

  Further, as shown in FIG. 1, the volume of the space S <b> 1 formed in the second joining member 20 in which the welding boss 12 is inserted into the insertion hole 21 in the volume of the space S <b> 2 of the dome portion 51 of the tool for thermal caulking 50. Is larger than the volume V1 of the welding boss 12 protruding from the second surface of the second joining member 20. Incidentally, the above-described space S <b> 1 is a space between the large diameter portion 23 and the welding boss 12 by inserting the welding boss 12 into the insertion hole 21, and is an annular space formed around the welding boss 12. .

  First, as shown in FIG. 1, the welding boss 12 of the second bonding member is inserted through the insertion hole 21 of the first bonding member 10. That is, the welding boss 12 is projected from the opening edge 24 on the second surface of the second bonding member 20.

  Then, as shown by the solid line arrow shown in FIG. 1, the heated caulking tool 50 is pressed against the tip of the welding boss 12 protruding from the opening edge 24. Then, the tip of the welding boss 12 is softened by being heated by the heat caulking tool 50. Therefore, the softened welding boss 12 flows into the space S <b> 1 along the dome portion 51 of the thermal caulking tool 50.

  Here, since the inner diameter at the opening edge of the dome portion 51 of the thermal caulking tool 50 is smaller than the inner diameter at the opening edge 24 of the large diameter portion 23, the dome portion of the thermal caulking tool 50 is compared with the case where it is not. It is easy to flow along the space 51 between the welding boss 12 that is not melted and the large diameter portion 23, that is, the space S <b> 1. Thereafter, the heat caulking tool 50 abuts on the second surface of the second bonding member 20, so that most of the space between the second bonding member 20 and the heat caulking tool 50, that is, the heat caulking space S <b> 2 is softened. The weld boss 12 is filled.

  Then, by pulling the heat caulking tool 50 away from the welding boss 12, the softened welding boss 12 is solidified and the melted portion 13 is formed. That is, as shown in FIG. 2, the melting portion 13 includes a first frusto-conical frustoconical portion 14 and a second domed second caulking portion 15 so as to surround the unfused welding boss 12. It is formed.

  The first heat caulking portion 14 is formed in the space between the welding boss 12 and the large diameter portion 23 located in the insertion hole 21, that is, the space S <b> 1. In this respect, the first heat caulking portion 14 of the present embodiment corresponds to a “heat caulking portion”. On the other hand, the second heat caulking portion 15 is formed on the second surface side of the second bonding member 20. Thus, the second heat caulking portion 15 is formed on the distal end side of the welding boss 12, and the first heat caulking portion 14 is formed on the proximal end side of the second heat caulking portion 15.

  Here, since the second heat caulking portion 20 is formed in a size corresponding to the dome portion 51 of the heat caulking tool 50, the outer diameter of the second heat caulking portion 15 is the opening edge 24 of the large diameter portion 23. It becomes smaller than the inner diameter. As a result, in the plan view of the thermal crimping structure 1, the second thermal crimping portion 15 is formed inside the opening edge 24 on the second surface side of the large diameter portion 23.

  Thus, in the present embodiment, the first heat-caulking portion 14 and the second heat-caulking portion 15 are formed, so that the first bonding member 10 and the second bonding member 20 are bonded. Since the first heat caulking portion 14 is formed in the space S1 of the large diameter portion 23 so as to be in contact with the peripheral surface of the large diameter portion 23, the first joining is performed in the direction orthogonal to the axial direction of the insertion hole 21. The member 10 and the second joining member 20 are relatively difficult to move. For this reason, even if there is a gap between the small hole portion 23 and the welding boss 12 after heat caulking, it is possible to suppress the occurrence of rattling between the first joining member 10 and the second joining member 20. .

  Moreover, in this embodiment, as shown in FIG.1 and FIG.2, the volume V3 of the 2nd thermal crimping part 15 is equal to the volume of the space S2 of the dome part 51 of the tool 50 for thermal crimping. On the other hand, the volume V2 of the first heat caulking portion 14 is smaller than the volume of the space S1. That is, there is a gap in the space S1. In other words, the welded boss 12 that has been softened beyond the space S1 does not flow into the space S1. Therefore, the softened welding boss 12 does not overflow to the second surface side of the second bonding member 20 when heat caulking, so that a burr as an excess resin portion is not easily formed. For this reason, formation of burrs on the second surface of the second bonding member 20 can be suppressed.

As described above in detail, according to the present embodiment, the following effects are obtained.
(1) The welding boss 12 softened by thermal caulking flows into the space between the welding boss 12 and the large-diameter portion 23 to form the first thermal caulking portion 14. That is, the space between the welding boss 12 of the first joining member 10 and the large diameter portion 23 of the second joining member 20 is filled with the first heat caulking portion 14. As a result, a gap is less likely to be generated between the first bonding member 10 and the second bonding member 20, and the first bonding member 10 and the second bonding member 20 are relative to each other in the direction orthogonal to the axial direction of the insertion hole 21. Difficult to move. Thus, according to the heat caulking structure 1 having this configuration, it is possible to suppress the occurrence of rattling between the first bonding member 10 and the second bonding member 20.
(2) Compared to the case where the second heat caulking portion 15 is formed so as to protrude from the opening edge 24 because the second heat caulking portion 15 is formed inside the opening edge 24 on the second surface of the large diameter portion 23. Thus, the first heat caulking portion 14 can be easily formed. Therefore, it is possible to suppress the rattling between the first bonding member 10 and the second bonding member 20.
(3) In the space between the welding boss 12 and the large-diameter portion 23, the welding boss 12 softened by heat caulking becomes easy to slide. That is, it becomes easier to form the first heat caulking portion 14.
(4) If the outer diameter of the welding boss is set to be equal to or larger than the inner diameter of the insertion hole and the welding boss is press-fitted into the insertion hole, rattling between the first bonding member and the second bonding member can be suppressed. It is necessary to perform a process of press-fitting the welding boss into the insertion hole. In the present embodiment, it is possible to suppress rattling between the first bonding member 10 and the second bonding member 20 without providing such a press-fitting step.

In addition, you may change the said embodiment as shown below.
When heat caulking, first, the welding boss 12 may be heated, and then the heat caulking tool 50 may be pressed to join the first joining member 10 and the second joining member 20 together. In this case, the welding boss 12 is heated with a laser.
-It is good also as a structure which does not provide the small diameter part 22 in the insertion hole 21. FIG. That is, the insertion hole 21 may be a tapered hole so as to gradually increase as it proceeds from the first surface toward the second surface.
The volume obtained by adding the volume of the space S1 formed in the second joining member 20 in which the welding boss 12 is inserted into the insertion hole 21 to the volume of the space S2 of the dome portion 51 of the thermal caulking tool 50 is the second volume. You may make it become equal to the volume V1 of the welding boss | hub 12 which protrudes from the 2nd surface of the joining member 20. FIG. In this case, the first heat caulking portion 14 is formed to fill the space S2.
The cross-sectional shape of the welding boss 12 and the insertion hole 21 may be a polygonal shape. For example, when the cross-sectional shape of the welding boss 12 and the insertion hole 21 is a square, the small hole portion in the insertion hole 21 is a quadrangular columnar hole, and the large hole portion is in a direction from the first surface to the second surface. As it progresses, it becomes a square frustum-shaped hole whose inner shape gradually increases. That is, it can be said that the inner shape of the second surface of the large hole portion is larger than the inner shape of the small hole portion, and the inner shape of the large hole portion is larger than the inner shape of the small hole portion.
The large-diameter portion 23 may be formed in, for example, an R shape or a stepped shape so that the inner shape gradually increases as it proceeds in the direction toward the second surface.
The large diameter portion 23 may be provided so that the inner shape does not change as it proceeds in the direction toward the second surface.
The inner diameter of the dome portion 51 of the heat caulking tool 50 may be the same as the inner diameter of the opening edge 24 of the large diameter portion 23. In this case, the outer diameter of the second heat caulking portion 15 may be the same as the inner diameter of the opening edge 24 of the large diameter portion 23.
-As shown in FIG. 3, you may form the recessed part 225 in the wall surface of the large diameter part 223. FIG. The recesses 225 are formed at positions facing each other across the axis of the insertion hole 221. The recesses 225 may be formed at two locations on the wall surface of the large-diameter portion 223 even if the recesses 225 are not formed at positions facing each other across the axis of the insertion hole 221. Further, the recess 225 may be formed in at least one place.

  Further, as shown in FIG. 4, a convex portion 326 may be formed on the wall surface of the large diameter portion 323. The concave portion 326 may be formed at least in one place on the wall surface of the large diameter portion 323 in the same manner as the concave portion 225 described above. And you may form the recessed part 225 and the convex part 326 in the wall surface of the large diameter parts 223,323.

According to this, the 1st heat crimping part 14 is formed so that the shape of the recessed part 225 or the convex part 326 formed in the inner wall face of the large hole parts 223 and 323 may be met. Accordingly, it is possible to further suppress the occurrence of rattling between the first bonding member 10 and the second bonding members 220 and 320. In particular, relative rotation of the first bonding member 10 and the second bonding members 220 and 320 about the axial direction of the insertion holes 221 and 321 can be suppressed.
As shown in FIG. 5, the large hole portion 423 may have a non-circular cross-sectional shape in the axial direction of the insertion hole 421. The cross-sectional shape of the large hole portion 423 may be, for example, a D shape, a polygon, or an ellipse shown in FIG.

According to this, the 1st heat crimping part 14 is formed so that a cross-sectional shape may match the shape of the large hole part 423 with a non-circular shape. Therefore, it is possible to further suppress the occurrence of rattling between the first bonding member 10 and the second bonding member 420. In particular, relative rotation of the first bonding member 10 and the second bonding member 420 around the axial direction of the insertion hole 421 can be suppressed.
As shown in FIG. 6, a heat caulking tool 550 in which a conical protrusion 552 is provided at the center of a dome portion 551 having a dome-shaped space may be used. When heat caulking is performed with the heat caulking tool, the softened welding boss 512 is likely to flow toward the outside of the space of the heat caulking tool 550 due to the protrusion. Therefore, the softened welding boss 512 easily flows into the space between the welding boss 512 located in the insertion hole 521 and the large hole portion 23. For this reason, the 1st heat crimping part 514 can be easily formed in the space S1 between the welding boss | hub 512 located in the insertion hole 21, and the large hole part 21. FIG. In this case, as shown in FIG. 7, the first heat caulking portion 514 is formed so as to fill the space S1.

DESCRIPTION OF SYMBOLS 1, 501: Thermal caulking structure 10, 510: 1st joining member 11, 511: Main body part 12, 512: Welding boss 13, 513: Melting part 14, 514: 1st thermal caulking part 15, 515: 2nd heat Caulking portions 20, 220, 320, 420: second joining members 21, 221, 321, 421: insertion holes 22, 422: small diameter portions (an example of small hole portions)
23, 223, 323, 423: Large diameter part (an example of a large hole part)
24: Opening edge 225: Concave portion 326: Convex portion 50, 550: Thermal caulking tool 51, 551: Dome portion

Claims (5)

A thermal caulking structure in which a first joining member having a welding boss and a second joining member in which an insertion hole is formed are joined,
The first joining member further has a fusion part formed by heat caulking the tip of the welding boss inserted through the insertion hole,
In the second bonding member, when the surface in contact with the first bonding member is the first surface and the surface opposite to the first surface is the second surface, the insertion hole is formed on the first surface side. An inner shape larger than the small hole portion and a large hole portion formed on the second surface side,
The fusion part is a thermal crimping structure having a thermal crimping part in a space between the welding boss located in the insertion hole and the large hole part. When the heat caulking portion is the first heat caulking portion,
The fusion part further has a second heat caulking part formed on the tip side of the welding boss by a tool for heat caulking,
The thermal caulking structure according to claim 1, wherein the second thermal caulking portion is formed inside an opening edge in the second surface of the large hole portion. The thermal caulking structure according to claim 1, wherein the large hole portion is a tapered hole having an inner shape that gradually increases from the first surface toward the second surface. The heat caulking structure according to any one of claims 1 to 3, wherein at least one of a concave portion and a convex portion is formed on a wall surface of the large hole portion. The thermal caulking structure according to any one of claims 1 to 4, wherein the large hole portion has a non-circular cross-sectional shape in the axial direction of the insertion hole.

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