JP6031966B2 - Welding structure of resin molded products - Google Patents

Description

  The present invention relates to a welded structure of a resin molded product disposed in a vehicle interior.

  Various resin molded products are arranged in the passenger compartment. When the shape is complicated, the resin molded product is divided into a plurality of members and integrated by assembling the members formed by the respective molds. When the divided members are integrated, the welded portions are respectively formed on the members to be joined, and they are integrated by heat welding in a state where both are combined. As for the form of the welded portion, it is general that one is a projection, the other is an opening, a projection is inserted into the opening, and the two are combined for thermal welding. An example of such a heat-welded structure of a resin molded product is Patent Document 1.

JP 2005-88621 A

When a plurality of resin members are integrated by heat welding, the bonding strength is proportional to the resin capacity melted at the welded portion, so it is desirable to secure the molten resin capacity at the welded portion as much as possible. For resin molded products placed in the passenger compartment, the requirement for disposing the joint surface of the product as much as possible to the occupant and the requirements of the disposition trajectory between the members during assembly are limited due to the location of the resin molded product. There is. In this case, in order to satisfy the outfitting trajectory requirements, the total length of the melting portion on the side moving along the outfitting trajectory may be shortened. Of course, even if the total length of the welded portion on the moving side is shortened, for example, the resin capacity of the melted portion can be secured by increasing the thickness. However, even if the thickness is to be increased, the size (thickness) of the joining part on the side to be joined to which the member moving along the outfitting locus is attached and the shrinkage at the time of melting must be taken into consideration, and the thickness is increased. In some cases, it is difficult to satisfy the rigging trajectory requirement and the resin welding requirement.
It is an object of the present invention to provide a welded structure of a resin molded product that satisfies both the mounting trajectory requirements and the resin welding requirements.

To achieve the above object, the welding structure of the resin molded article according to the present invention includes a first joint member made of tree butter, and the second joint members made of outfitting resin capable with respect to the first joint member , respectively formed in the first and the second bonding member and the bonding member, and the first joining member the second joining member comprises a molten portion you integrated by thermal fusion, of the second joint members The melted portion is a protrusion, and the melted portion of the first bonding member is a welded structure of a resin molded product that is an opening into which the protrusion is inserted and assembled, and the opening penetrates the first bonding member The protruding portion penetrates the first bonding member, and the resin guide portion that contacts the protruding portion is formed on the surface of the first bonding member opposite to the surface that contacts the second bonding member . It is characterized by being formed integrally with one joining member .

According to the present invention, the melted portion of the second joining member is a protrusion, and the melted portion of the first joining member is a welded structure of a resin molded product that is an opening into which the protrusion is inserted and assembled. The opening is formed so as to penetrate the first joining member, and the protrusion penetrates the first joining member, and is opposite to the surface of the first joining member that contacts the second joining member. Since the resin guide portion that contacts the protrusion is formed integrally with the first joining member, the resin volume of the melted portion of the first joining member is increased by the capacity of the guide portion. For this reason, even if the fusion part of the second joining member has a reduced capacity due to assembly restrictions, heat welding can be performed in a state in which the resin capacity necessary for heat welding is ensured, and both the mounting trajectory requirement and the resin welding requirement can be satisfied. It is possible to provide a welded structure of the resin molded product to be filled.

The disassembled perspective view which shows the structure of the meter panel to which the welding structure of the resin molded product which concerns on this invention was applied. The exploded view which shows the structure of the 1st joining member of the food | hood part which comprises a meter panel, and a 2nd joining member. The expansion perspective view which shows the structure of the welding part of a 1st joining member. The expansion perspective view which looked at the composition of the welding part of the 1st joined member from the inside. The exploded perspective view which looked at the 1st joined member and the 2nd joined member from the inside. It is an operation | movement figure at the time of the welding part of a 2nd joining member being inserted in the welding part of a 1st joining member, (a) is a side view, (b) is a top view. The expansion perspective view which shows the state by which the welding part of the 2nd joining member was assembled | attached to the welding part of the 1st joining member. The perspective view which shows the assembly completion state of a meter panel. The expansion perspective view which looked at another form of the welding part of the 1st joining member from the inside. The operation | movement figure at the time of the welding part of a 2nd joining member being inserted in the welding part of the 1st joining member shown in FIG. It is a figure which shows another arrangement | positioning form of a guide part, (a) is a side view, (b) is a top view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a meter panel 1 which is a resin molded product. The meter panel 1 includes a panel main body 2, a hood 3 serving as a first joining member, and a bezel 4 serving as a second joining member. The panel main body 2, the hood 3, and the bezel 4 are made of a resin molded as individual parts using the same resin material. The panel body 2 is fixed to an instrument panel 5 provided in the vehicle interior. The hood 3 and the bezel 4 are assembled to each other on a welding jig (not shown) and integrated by heat welding, and then the upper surface so as to cover the panel mounting opening 2b formed on the upper surface 2a of the panel body 2. 2a.

The hood 3 has a U-shaped cross section, and a part of the hood 3 protrudes to form an eaves portion 6. The lower portion of the eaves portion 6 is a mounting portion 7 for the bezel 4, and the bezel 4 is assembled from below.
Openings 8 and 9 serving as welding portions when the hood 3 and the bezel 4 are integrated are respectively provided at the end portions 3C and 3D of the side portions 3A and 3B of the hood 3 that are located on the mounting portion 7 and face each other. Is formed. As shown in FIGS. 3 and 4, the opening 8 and the opening 9 are formed on the flanges 10, 10 formed from the side surfaces 3 </ b> A, 3 </ b> B toward the inside of the hood 3, and from the front surface 10 </ b> A of each flange 10 to the back surface 10 </ b> B. Two portions are formed in the vertical direction so as to penetrate. Each of the openings 8 and 9 has a rectangular front shape, and is formed so that the opening area on the back surface 10B side is smaller than the opening area of the front surface 10A. Each of the openings 8 and 9 is an inclined surface that rises while curving upward at the bottom 8C and 9C from the front surface 10A side to the back surface 10B side. The shapes of the openings 8 and 9 are determined based on the relationship between a mounting locus O of the bezel 4 and a welded portion of the bezel 4 which will be described later.

  As shown in FIG. 1, the whole bezel 4 is formed in a frame shape. The side portions 4A and 4B of the bezel 4 facing each other across the space portion surrounded by the edge are formed to face the end portions 3A and 3B of the hood 3. As shown in FIGS. 2 and 5, projections 11 and 12 serving as melting portions are formed on the side surfaces 4 </ b> A and 4 </ b> B on the side of the joint surfaces 4 </ b> C and 4 </ b> D with the ends 3 </ b> C and 3 </ b> D. The protrusions 11 and 12 protrude outward from the joint surfaces 4C and 4D, and are formed at two locations in the vertical direction. The tips 11A and 12A of the protrusions 11 and 12 have a knife shape that is an inclined surface that rises while curving from the lower part toward the upper part. The protrusions 11 and 12 have shapes and sizes that can be inserted into the openings 8 and 9 as shown in FIG.

  The reason why each of the protrusions 11 and 12 is formed in a knife shape is due to the mounting trajectory O of the bezel 4 with respect to the hood 3. When the bezel 4 is mounted on the mounting portion 7 of the hood 3, first, the upper end 4E of the bezel 4 is mounted on the lower surface 6A of the eaves portion 6 as shown in FIG. After mounting the upper end 4E, the fitting locus O when the joint surfaces 4C and 4D are joined to the flanges 10 and 10 of the end portions 3C and 3D of the hood 3 by swinging clockwise from the mounting portion as a starting point in the figure is an arc. Because it draws. For this reason, the volume of the knife-shaped protrusions 11 and 12 is reduced compared to the rectangular shape. The reason that the bezel 4 is attached to the hood 3 while drawing the arcuate outfitting locus O is to prevent the occupant in the vehicle cabin from seeing the joint portion between the hood 3 and the bezel 4.

  As shown in FIGS. 6A and 6B, each of the openings 8 and 9 is formed such that the opening width W intersecting with the mounting locus O is larger than the width H of the protrusions 11 and 12. Yes. The openings 8 and 9 are formed such that the opening width W2 on the back surface 10B side is narrower than the opening width W1 of the front surface 10A. The opening width W2 is large enough to allow the protrusions 11 and 12 to be inserted. FIG. 6 shows only one of the openings 8 and 9 side.

  As shown in FIGS. 3 and 4, ribs 13 serving as guide portions are respectively formed integrally with the back surface 10 </ b> B side of the flange 10 at the edges 8 </ b> A and 9 </ b> A of the openings 8 and 9. As shown in FIGS. 6A and 6B, each rib 13 has a protrusion 11 of the bezel 4 when the protrusions 11 and 12 of the bezel 4 are assembled to the openings 8 and 9 of the hood 3. And the side surface 13A is disposed at a position where it abuts and is integrally formed with the flange 10. That is, the rib 13 is formed so that the side surface 13 </ b> A serving as a contact surface with the projections 11, 12 is positioned near the center of the opening width W of the openings 8, 9. The size of the rib 13 is set to a capacity that can secure a resin capacity required when the protrusions 11 and 12 and the openings 8 and 9 are welded together. That is, it is set as the capacity | capacitance which supplements the shortage of the resin capacity | capacitance by making the projection parts 11 and 12 into the shape of a knife instead of rectangular shape.

  In such a configuration, in order to integrate the hood 3 and the bezel 4, as shown in FIG. 2, the upper end 4E of the bezel 4 is mounted on the lower surface 6A of the eaves portion 6, and the bezel 4 is illustrated starting from the mounting portion. Swing around the middle clock. Then, as shown in FIG. 7, the protrusions 11 and 12 of the bezel 4 are inserted into the openings 8 and 9 of the hood 3. When the protrusions 11 and 12 are inserted into the openings 8 and 9 of the flanges 10 and 10 of the hood 3, the side surface 13 </ b> A of the rib 13 disposed on the center side of the openings 8 and 9 is formed on the protrusions 11 and 12. Abuts elastically. That is, when the hood 3 and the bezel 4 are integrated (assembled), the ribs 13 function as alignment regulation guides when the projections 11 and 12 of the openings 8 and 9 are inserted on the welding jig. . For this reason, the bezel 4 is held in a state of being mounted on the hood 3.

Bonding surface 4C of the bezel 4 in this holding state, the end portion 3C of the 4D and the hood 3, 3D (see FIG. 5) and in a state where the was no gap contact, projections 11 and 12 is inserted into the opening 8, 9 The part assembled in this manner is sandwiched with a well-known welding tool and heat-melted, and both are heat-welded and integrated. As shown in FIG. 8, the integrated unit is attached to the panel body 2b.

In this embodiment, when the protrusions 11 and 12 that become the melted part of the bezel 4 are assembled to the melted part of the hood 3 and the openings 8 and 9, the resin is formed at the position of the bezel 4 that contacts the protrusions 11 and 12. Each of the ribs 13 was formed. For this reason, even if the resin volume of the welding location is increased by the capacity of each rib 13 and the capacity of the projections 11 and 12 is reduced due to restrictions on the assembly, thermal welding is performed in a state where the resin capacity necessary for thermal welding is secured. Yes.
Since the resin capacity necessary for welding can be secured by the ribs 13, the rigidity of the assembling locations of the protrusions 11, 12 and the openings 8, 9 can be increased even before welding. For this reason, when the hood 3 and the bezel 4 are integrated (assembled), rigidity can be maintained even if the hood 3 and the bezel 4 are attached to a welding jig (not shown), and the finished quality after welding is ensured. Can do. In the present embodiment having such a configuration, it is possible to provide a welded structure of a resin molded product that satisfies both the mounting trajectory requirement and the resin welding requirement.

As shown in FIGS. 9 and 10, the ribs 13 are arranged not on the side edges 8A and 9A on one side of the opening, but on the edges 8A and 8B and the edges 9A and 9B facing each other in the openings 8 and 9, respectively. It may be arranged so that the protrusions 11 and 12 are sandwiched from both sides. With such an arrangement, the protrusions 11 and 12 can further increase the rigidity of the assembly position of the openings 8 and 9 even before welding. Further, the holding force when the projections 11 and 12 are inserted into the openings 8 and 9 and the bezel 4 is mounted on the hood 3 is also increased. Furthermore, the size of one rib can be made smaller than the case where the resin volume of the portion where the protrusions 11 and 12 are inserted and assembled in the openings 8 and 9 is secured by one rib. For this reason, it is easier to form two ribs than when one rib is formed.

In the above embodiment, the ribs 13 are arranged so as to contact the side surfaces of the projections 11 and 12, but as shown in FIG. 11, the ribs 13 are brought into contact with the upper surfaces 11B and 12B of the projections 11 and 12. May be. Even in such an arrangement, the capacity of the projections 11 and 12 is reduced due to restrictions on assembly, but even if the capacity is reduced, the heat welding can be performed in a state in which the resin capacity necessary for the heat welding is ensured.
In the present embodiment, two openings 8 and 9 and two protrusions 11 and 12 serving as melting portions are formed, but the number of these openings 8 and 9 and protrusions 11 and 12 is two. It is not limited to one and may be one or three or more.

DESCRIPTION OF SYMBOLS 1 Resin molded product 3 1st joining member 4 2nd joining member 8, 9 Opening part (melting part)
11, 12 Protruding part (melting part)
13 Guide part О Outfitting locus H Width of melted part of second joining member W, W1, W2 Opening width

Claims (2)

A first joining member made of tree fat,
A second joining member made of resin that can be fitted to the first joining member;
Said first respectively formed in the a joining member second joint members, comprising a molten portion you integrated by thermal fusion and said second joint member and the first bonding member,
The melting part of the second joining member is a protrusion ,
The molten portion of the first joint member is a welded structure of the opening der Ru resin moldings are assembled the projections is inserted,
The opening is formed so as to penetrate the first joining member ;
The protrusion penetrates the first joining member,
A resin guide portion that contacts the protrusion is formed integrally with the first bonding member on a surface of the first bonding member that is opposite to the surface that contacts the second bonding member. Welding structure of resin molded products. The opening is formed with a larger opening width in a direction intersecting the outfitting trajectory than the width of the melted portion of the second joining member,
2. The resin according to claim 1 , wherein the guide portion is formed so that a contact surface with the melted portion of the second bonding member is positioned near the center of the opening width of the opening portion. Molded product welding structure.

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