JP2020067108A - Resin component fixation method - Google Patents

Abstract

To provide a resin component fixation method enabling a first component as a resin component to be easily temporally fixed to a second component before thermal caulking.SOLUTION: The resin component fixation method is provided in which a first thermoplastic resin component 11 having a projecting part 13 with a rib 14 and a protruding part 18, and a second component 20 having a through-hole 21 into which the projecting part 13 can be inserted, are fixed to each other. The method comprises: a temporal fixation step of temporarily fixing the first component 11 and the second component 20 to each other by inserting the projecting part 13 into the through-hole 21 to sandwich the second component 20 between the rib 14 and the protruding part 18; and a thermal caulking step of fusing the tip end side extending from the protruding part 18 of the projecting part 13 to thereby form a caulking head part larger than the through-hole 21.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method of fixing a resin component by thermal crimping.

  Conventionally, as a fixing method of this kind of resin component, for example, a fixing structure for vehicle interior parts disclosed in Patent Document 1 is known. Such a fixing structure for a vehicle interior component includes a plate-shaped first vehicle interior component integrally formed with a convex fixing member and a plate-shaped second vehicle having a through hole into which the convex fixing member can be inserted. And interior items for. The convex fixing member includes a cylindrical boss integrally protruding from the first vehicle interior component and four ribs formed on the outer peripheral surface of the base end portion of the boss at equal intervals in the circumferential direction. I have it.

  Then, in a state where the boss of the convex fixing member of the first vehicle interior product is inserted into the through hole of the second vehicle interior product, the tip protruding from the through hole in the boss to the opposite side of the second vehicle interior product. The second vehicle interior component is fixed to the first vehicle interior component by performing thermal caulking that melts the portion and forms a caulking head portion that is larger than the through hole.

JP, 2008-69873, A

  By the way, in the fixing structure for the vehicle interior component as described above, thermal caulking is performed in a state where the boss of the convex fixing member of the first vehicle interior component is simply inserted into the through hole of the second vehicle interior component. There is. Therefore, depending on how to handle the interior parts for the first vehicle and the interior parts for the second vehicle before thermal caulking, the boss may come out of the through hole due to gravity or the like. It is necessary for the person to handle the second vehicle interior parts while supporting them. As a result, there is a problem that the handling work before the second vehicle interior component is thermally crimped to the first vehicle interior component becomes a burden on the operator.

  The present invention has been made paying attention to the problems existing in such conventional techniques. An object of the present invention is to provide a fixing method for a resin component, which can easily temporarily fix the first component, which is a resin component, to the second component before the heat caulking.

Hereinafter, the means for solving the above-mentioned problems and the effects thereof will be described.
A method of fixing a resin component that solves the above-mentioned problem is a resin component that fixes a first component made of a thermoplastic resin having a cylindrical protruding portion and a second component having a through hole into which the protruding portion can be inserted. A fixing method, wherein a rib is provided at a base end portion of the outer peripheral surface of the protruding portion, and a rib is provided at a position between the rib and the tip portion of the protruding portion on the outer peripheral surface of the protruding portion. Protrusions are provided so as to form a gap therebetween, the protrusion is inserted into the through hole, and the rib and the protrusion sandwich the second component, whereby the first component and the second component. And a thermal crimping step of melting the tip side from the convex portion of the protruding portion to form a crimping head larger than the through hole.

  With this configuration, it is possible to carry out the manipulating work in a state where the first component is temporarily fixed to the second component. That is, the handling work can be performed without supporting the first component. Therefore, the first component, which is the resin component, can be easily temporarily fixed to the second component before the heat crimping.

  According to the present invention, the first component, which is a resin component, can be easily temporarily fixed to the second component before the heat caulking.

The perspective view which shows the principal part of the 1st component in one embodiment. The perspective view which shows the principal part of a 2nd component. The perspective view which shows the state after performing a temporary fixing process. Sectional drawing of FIG. The perspective view which shows the state after performing a heat crimping process.

Hereinafter, one embodiment of a method for fixing a resin component will be described with reference to the drawings.
As shown in FIG. 1, a first component 11 made of a thermoplastic resin, which is a resin component such as an interior trim of a vehicle, includes a plate-shaped main body 12 and a plurality of cylinders integrally formed on one surface of the main body 12. And a protruding portion 13 having a shape (only one protruding portion 13 is shown in FIG. 1). The protrusion 13 extends perpendicularly to the main body 12. A plurality of (four in this example) plate-shaped ribs 14 are provided at the base end portion of the outer peripheral surface of the protrusion 13 at equal intervals in the circumferential direction of the protrusion 13. Each rib 14 is integrally formed with both the protrusion 13 and the main body 12.

  The four ribs 14 are composed of two pairs of ribs 14 that face each other with the protruding portion 13 interposed therebetween. Of the two pairs of ribs 14, one is a first rib pair 15 and the other is a second rib pair 16. The first rib pair 15 and the second rib pair 16 are arranged so as to be displaced from each other by an angle of 90 degrees in the circumferential direction of the protrusion 13. A pair of slits 17 extending in the axial direction (longitudinal direction) of the protrusion 13 are provided on the tip side of the protrusion 13 with respect to the first rib pair 15 so as to face each other in the radial direction.

  The pair of slits 17 has a position in the circumferential direction of the protruding portion 13 that matches the first rib pair 15, and extends straight from the first rib pair 15 in the protruding portion 13 to the tip of the protruding portion 13. That is, the pair of slits 17 are opposed to each other with the central axis of the protrusion 13 interposed therebetween. In other words, the pair of slits 17 are formed at positions that divide the protrusion 13 into two equal parts. The width of the pair of slits 17 in this embodiment is the same as the thickness of the ribs 14 forming the first rib pair 15.

  A pair of protrusions 18 is provided on the outer peripheral surface of the protrusion 13 at a position between the second rib pair 16 and the tip of the protrusion 13 so as to form a gap between the second rib pair 16 and the second rib pair 16. Has been. That is, the convex portions 18 are provided so as to form a pair on both sides of the outer peripheral surface of the protruding portion 13 with the pair of slits 17 interposed therebetween.

  In other words, in the pair of convex portions 18, the circumferential position of the projecting portion 13 matches the second rib pair 16, and the angle of 90 degrees in the circumferential direction of the projecting portion 13 with respect to the pair of slits 17. It is arranged so that the position is shifted by an amount. The surface of each protrusion 18 on the tip side of the protrusion 13 is a sliding surface 19 that is inclined such that the protrusion height from the outer peripheral surface of the protrusion 13 gradually decreases toward the tip of the protrusion 13. ing.

  As shown in FIGS. 2 and 4, the second component 20 has a plate shape and is made of, for example, synthetic resin or metal. The second component 20 has a plurality of circular through holes 21 into which the protrusions 13 can be inserted. Each through hole 21 is arranged so as to correspond to each protrusion 13 of the first component 11. The peripheral edge portion 22 of each through hole 21 on the side where the protruding portion 13 is inserted is R-chamfered.

  The diameter of the through hole 21 is larger than the outer diameter of the protruding portion 13, and is slightly smaller than the sum of the outer diameter of the protruding portion 13 and the protruding height of the pair of protrusions 18 from the outer peripheral surface of the protruding portion 13. Is set. The thickness of the second component 20 is set to be slightly thinner than the gap between the second rib pair 16 and the pair of convex portions 18 in the first component 11.

Next, a method of fixing the first component 11 configured as described above to the second component 20 will be described.
When fixing the first component 11 and the second component 20, first, the protrusions 13 of the first component 11 are inserted into the through holes 21 of the second component 20. Then, the sliding surfaces 19 of the pair of protrusions 18 provided on each protrusion 13 abut on the peripheral edge 22 of each through hole 21. Subsequently, when each protrusion 13 is pushed into each through hole 21, the sliding surfaces 19 of the pair of protrusions 18 provided on each protrusion 13 slide on the inner peripheral surface of the through hole 21 to cause each protrusion. The portion 13 receives a pressing force from the inner peripheral surface of the through hole 21 via the pair of convex portions 18.

  Then, due to this pressing force, each protrusion 13 is elastically deformed so that the width of the pair of slits 17 becomes smaller. Therefore, the portion of each protrusion 13 provided with the pair of protrusions 18 smoothly passes through each through hole 21. Then, as shown in FIGS. 3 and 4, each protrusion 13 returns to its original shape before elastic deformation due to its elastic restoring force, so that each of the pair of protrusions 18 provided on each protrusion 13 is The second part 20 is sandwiched by the second rib pair 16 and the pair of convex portions 18 provided on each of the protrusions 13 while being locked in the through hole 21.

  As a result, the protrusions 13 of the first component 11 do not easily come out of the through holes 21 of the second component 20, and the first component 11 and the second component 20 are temporarily fixed (temporary). Stop process). Subsequently, when all of the tip side from the pair of protrusions 18 in each protrusion 13 (all the portions passing through each through hole 21 in each protrusion 13) is melted by a thermal caulking device (not shown), as shown in FIG. In addition, a disk-shaped crimp head 23 having a diameter larger than that of each through hole 21 is formed at the tip of each protruding portion 13 (thermal crimping step).

  As a result, the second component 20 is firmly sandwiched by the four ribs 14 (first rib pair 15 and second rib pair 16) provided on each protrusion 13 and the crimp head 23, and The component 11 and the second component 20 are fixed.

  As described above, since each protrusion 13 of the first component 11 is provided with the pair of protrusions 18, it exhibits a temporary fixing function between the first component 11 and the second component 20. Therefore, the first component 11 which is a resin component can be easily temporarily fixed to the second component 20 before the heat crimping.

According to the embodiment described in detail above, the following effects are exhibited.
(1) The method of fixing the resin component is to insert the protrusion 13 into the through hole 21 and sandwich the second component 20 between the second rib pair 16 and the pair of protrusions 18 to form the first component 11 and the second component. And a thermal crimping step of melting the tip end side from the pair of convex portions 18 in the projecting portion 13 to form the crimping head portion 23 larger than the through hole 21. According to this configuration, it is possible to carry out the manipulating work in a state where the first component 11 is temporarily fixed to the second component 20. That is, regardless of the postures of the first component 11 and the second component 20, the manipulating work can be performed without supporting the first component 11. Therefore, the first component 11 which is a resin component can be easily temporarily fixed to the second component 20 before the heat crimping.

  (2) In the method of fixing the resin component, a pair of slits 17 extending in the longitudinal direction are provided on the tip side of the ribs 13 in the protruding portion 13 so as to face each other in the radial direction. According to this configuration, the protrusion 13 is elastically deformed so that the diameter of the protrusion 13 becomes smaller (so that the width of the slit 17 becomes smaller), so that the protrusion 13 can be easily inserted into the through hole 21. You can

  (3) In the method of fixing the resin component, the convex portions 18 are provided so as to form a pair on both sides of the outer peripheral surface of the protruding portion 13 with the pair of slits 17 interposed therebetween. According to this configuration, the pair of protrusions 18 in the protrusion 13 is provided by elastically deforming the protrusion 13 so that the diameter of the protrusion 13 becomes smaller (so that the width of the slit 17 becomes smaller). The part can be easily inserted into the through hole 21.

  (4) In the method of fixing resin parts, a plurality of ribs 14 (four in this example) are provided at intervals in the circumferential direction of the protrusion 13. According to this structure, the strength of the protrusion 13 can be increased.

(Example of change)
The above embodiment may be modified as follows.
-The number of ribs 14 in the first component 11 may be arbitrarily changed as long as it is one or more.

The plurality (four) of ribs 14 need not be provided at equal intervals in the circumferential direction with respect to the outer peripheral surface of the protruding portion 13.
-Any one of the pair of convex portions 18 of the first component 11 may be omitted.

The pair of slits 17 in the first component 11 may be omitted.
-The length of the slit 17 may be changed appropriately.
The shape of the protrusion 13 may be a polygonal cylinder or an elliptic cylinder. In this case, it is preferable to change the shape of the through hole 21 in accordance with the shape of the protruding portion 13.

  Reference numeral 11 ... First component, 13 ... Projection portion, 14 ... Rib, 17 ... Slit, 18 ... Convex portion, 20 ... Second component, 21 ... Through hole, 23 ... Caulking head.

Claims (4)

A method of fixing a resin component, comprising: fixing a first component made of a thermoplastic resin having a cylindrical protrusion and a second component having a through hole into which the protrusion is insertable,
A rib is provided on the base end portion of the outer peripheral surface of the protrusion,
A protrusion is provided at a position between the rib and the tip of the protrusion on the outer peripheral surface of the protrusion so as to form a gap between the rib and the protrusion,
A temporary fixing step of temporarily fixing the first component and the second component by inserting the protrusion into the through hole and sandwiching the second component between the rib and the protrusion;
A thermal caulking step of melting the tip side from the convex portion of the protruding portion to form a caulking head larger than the through hole,
A method for fixing a resin component, comprising:   The resin component fixing method according to claim 1, wherein a pair of slits extending in the longitudinal direction are provided so as to face each other on the tip side of the rib in the protruding portion.   The method of fixing a resin component according to claim 2, wherein the protrusions are provided so as to form a pair on both sides of the outer peripheral surface of the protrusion with the pair of slits sandwiched therebetween.   The resin component fixing method according to claim 1, wherein a plurality of the ribs are provided at intervals in the circumferential direction of the protruding portion.