JP2004009708A - Welded structure of resin molded member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the joint strength of a first member and a second member and prevent a part of a welded rib from flowing into a groove part formed in a joint area. <P>SOLUTION: Regulating ribs 30 and 30A which extend to an adjacent region properly spaced from the welded ribs 24 and 24A protruding from a second joint area 22 formed at the second member 20, are formed protruding at a specified position on a first joint area l6 formed at the first member l2. The tips of the regulating ribs 30 and 30A come into contact with the second joint area 22 in an appropriate timely manner after the start of vibratory welding and the spread of the welded ribs 24 and 24A which melt out into between both joint areas l6 and 22 is controlled by the regulating ribs 30 and 30A. Consequently, the welded ribs 24 and 24A are properly pressurized and the degree of compatibility between the welded ribs 24 and 24A and each of the joint areas l6 and 22 is increased. In addition, the regulating rib 30A prevents the molten welded rib 24A from flowing into the groove part 26. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a welded structure of a resin molded member, and more specifically, a first joint surface provided on a first member made of a resin material, a second joint surface provided on a second member made of a resin material, A welding rib protruding from a required position on the joining surface, and applying vibration while abutting the welding rib on the first joining surface, so that the welding rib melted by frictional heat is interposed between the two joining surfaces. The present invention relates to a welded structure of a resin molded member which is spread to join both members.
[0002]
[Prior art]
2. Description of the Related Art In recent years, automobiles manufactured as standard are equipped with an airbag device for a driver's seat occupant and an airbag device for a passenger seat occupant in order to protect the occupant from an impact due to a collision or the like. Of these, the airbag device for a passenger in the passenger seat is housed inside an instrument panel as a vehicle interior member attached to the front of the passenger compartment while being fixed to a vehicle body component. For this reason, the instrument panel is provided with an airbag door at a portion corresponding to the airbag device for the passenger on the front passenger seat. It opens to the room side.
[0003]
The instrument panel is mainly composed of a synthetic resin panel member injection-molded into a required shape, and is a single-layer type composed of only the panel member, or a two-layer type in which a skin material is adhered to an outer surface of the panel member. And a three-layer type in which a skin material is applied to the outer surface of the panel member via a cushion material. Here, since the panel member is formed of a relatively hard resin material such as PP (polypropylene) or ASG, the airbag door, which is a part of the panel member, is always attached to the airbag door at a low temperature. When a strong pressing force is applied to the airbag, the airbag may be damaged or scattered by the impact, and there is a problem from the viewpoint of strength and safety. Therefore, as shown in FIG. 7, the insert member 20 which is connected and supported by the airbag device 40 is joined to the back surface of the airbag door 14 provided on the panel member 12, and the airbag door 14 and the surrounding area are damaged. And measures to prevent scattering due to this.
[0004]
Conventionally, the insert member 20 has been mainly made of metal. However, in order to reduce the weight, reduce the cost and improve the recyclability, the insert member 20 has recently been made of an olefin-based thermoplastic elastomer (TPO) or the like. Is being adopted (FIG. 8). For this reason, since the panel member 12 (airbag door 14) made of a resin material and the insert member 20 made of a resin material are both made of synthetic resin and are compatible with each other, welding joining is performed based on a known vibration welding technique. Often done. Here, as is well known, the vibration welding is such that the panel member 12 and the insert member 20 are brought into contact with each other at the portions to be joined (joining surfaces 16 and 22) using a vibration welding machine (not shown), and the respective members are joined. For example, by vibrating the insert member 20 in the horizontal direction in a state in which the members 12 and 20 are pressed with a required pressing force, the joint surfaces 16 and 22 are separated from each other by frictional heat generated on the joint surfaces 16 and 22 of the members 12 and 20. Are melted and adhered.
[0005]
[Problems to be solved by the invention]
In the above-described vibration welding, for example, when a plurality of welding ribs (welding margins) 24 are protruded from the joining surface 22 of the insert member 20, the joining surface 16 of the panel member 12 (airbag door 14) comes into contact. Since the welding ribs 24 that have come into contact with each other are melted by frictional heat and melt out between the joining surfaces 16 and 22, the degree of compatibility increases, and the welding strength of the members 12 and 20 can be improved. It is known (FIG. 9). In addition, if the panel member 12 and the insert member 20 are appropriately pressed in a direction approaching each other, the welding ribs 24 formed by melting and melting the respective joint surfaces 16, 22 of the two members 12, 20 can be obtained. , And the degree of compatibility is further increased, so that the joining strength between the two members 12 and 20 can be improved.
[0006]
However, in practice, when the panel member 12 and the insert member 20 are pressed toward each other at the time of vibration welding, the welding rib 24 that has melted and melted out between the two joining surfaces 16 and 22 forms the welding rib 24 of the insert member 20. It is pushed out from the edge (FIG. 10). That is, since the movement (flow) of the welding rib 24 that has melted between the joining surfaces 16 and 22 of both members 12 and 20 is hardly restricted, when the pressing force on both members 12 and 20 is increased, Only by increasing the amount of the welding rib 24 extruded from the edge of the insert member 20, it is not possible to press the joining surfaces 16, 22 against the welding rib 24 with an appropriate pressing force. Therefore, there is a problem that the compatibility between the joining surfaces 16 and 22 cannot be increased and the joining strength between the members 12 and 20 cannot be improved.
[0007]
On the other hand, in the airbag door 14 provided integrally with the panel member 12, a tear line 18 is extended along the outer edge contour line, and the pressing force of the airbag 42 when the airbag device 40 is activated. When the airbag door 14 is actuated, the expected tear line 18 is broken, and the opening of the airbag door 14 is allowed (FIG. 7). The cleavage line 18 was made thin by forming a groove 26 along the outer edge line of the airbag door 14 from the back side of the panel member 12 by integral molding or laser processing based on the mold structure of the mold. The groove 26 is open on the joint surface 16 because of being a part (FIG. 9). Therefore, at the time of the vibration welding, as shown in FIG. 10, the welding rib 24 (24A) protruding adjacent to the groove 26 melts between the joining surfaces 16 and 22 of the panel member 12 and the insert member 20. When it comes out, part of it flows into the groove 26 and solidifies as it is.
[0008]
Therefore, when the airbag device 40 is actuated and the pressing force of the airbag 42 is applied, there is a fear that the planned tearing line 18 may not be appropriately broken, and the smooth opening of the airbag door 14 is hindered. There was a possibility that the inflation and deployment of the bag 42 would be hindered. Also, when the resin solidified in the groove 26 adheres to the open end 14a of the airbag door 14 when the airbag door 14 is opened after the predetermined cleavage line 18 is broken, the airbag 42 in the inflation process is opened. When the resin comes into contact with the open end 14a, the resin is dissociated from the airbag door 14 and scatters as resin fragments, and when this collides with an occupant, there is a fear that a secondary disaster may occur.
[0009]
[Object of the invention]
The present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed to appropriately solve the problem, and has been melted out between the joining surfaces of the first member and the second member. By controlling the spread (flow) of the welding rib, the joining strength of both members can be improved, and a part of the molten welding rib can be prevented from flowing into the groove formed on the joining surface. An object of the present invention is to provide a welding structure for a resin molded member as described above.
[0010]
[Means for Solving the Problems]
In order to solve the above problems and achieve the intended object, the present invention provides a first joining surface provided on a first member made of a resin material, a second joining surface provided on a second member made of a resin material, (2) a welding rib protruding from a required position on the joining surface, and by applying vibration while bringing the welding rib into contact with the first joining surface, the welding rib melted by frictional heat is interposed between the two joining surfaces. In the welded structure of the resin molded member, the two members are joined by spreading
At a required position of the first joining surface, a regulating rib is provided to protrude toward an adjacent portion appropriately spaced from the welding rib,
By causing the tip of the regulating rib to abut on the second joining surface at an appropriate timing after the start of melting of the welding rib, the spread of the welding rib melted out between both joining surfaces is appropriately regulated by the regulating rib. It is characterized by being constituted so that it can be performed.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a welding structure of a resin molded member according to the present invention will be described below with reference to the accompanying drawings by taking a preferred embodiment. The welding structure of the resin molded member according to the present invention can be adopted for all members made of a resin material that are compatible and can be subjected to vibration welding. Therefore, in the embodiment, the panel member 12 of the instrument panel 10 will be exemplified as the first member made of the resin material, and the insert member 20 will be explained as the second member made of the resin material. Therefore, in describing the related art, the same members and portions as those already described will be denoted by the same reference numerals.
[0012]
FIG. 1 is a schematic cross-sectional view showing a panel member as a first member and an insert member as a second member adopting a welding structure of a resin molded member according to the present embodiment in a state before joining. Here, the panel member 12 integrally formed with the airbag door 14 is a resin molded member made of a synthetic resin such as PP (polypropylene) or ASG, and the insert member 20 is made of olefin-based heat. It is a resin molded member made of a plastic elastomer (TPO) or the like, and both members 12 and 20 have compatibility.
[0013]
In the panel member 12, a back surface of a portion where the airbag door 14 is formed and a peripheral portion thereof serve as a joining surface 16 (a first joining surface for convenience of explanation) which is a portion to be welded. Further, in the insert member 20, the upper surface corresponding to the first joint surface 16 provided on the panel member 12 has a joint surface 22 (a second joint surface for convenience of explanation) which is a welding scheduled portion. Has become.
[0014]
The plurality of welding ribs 24 project from the outer surface of the second joint surface 22 to a required amount of protrusion H at a required interval in the vertical and horizontal directions on the second joint surface 22 provided on the insert member 20. (Fig. 2). These welding ribs 24 come into contact with the first joint surface 16 provided on the panel member 12 when performing the vibration welding, and each of them melts due to frictional heat and melts out between the two joint surfaces 16 and 22. After that, it is solidified so that the panel member 12 and the insert member 20 are welded and joined.
[0015]
In the welding structure of the resin molded member of the embodiment, a plurality of regulating ribs 30 are provided at required positions of the first joint surface 16 provided on the panel member 12 so as to have a required projection from the outer surface of the first joint surface 16. It protrudes in the quantity h (FIG. 2). When the first bonding surface 16 of the panel member 12 and the second bonding surface 22 of the insert member 20 are aligned at the time of vibration welding, the regulating ribs 30 protrude from the second bonding surface 22. It extends toward an adjacent part which is appropriately spaced from the base member 24. The restricting ribs 30 are projected, for example, in a lattice shape, and extend so as to surround the respective welding ribs 24.
[0016]
Here, the protrusion amount h of each of the control ribs 30 is set to be smaller than the protrusion amount H of the welding rib 24, and the protrusion amount h of the control rib 30 is approximately の of the protrusion amount H of the welding rib 24. It has been. Therefore, at the start of the vibration welding, only the respective welding ribs 24 come into contact with the first bonding surface 16 of the panel member 12, and the tip of the regulating rib 30 is connected to the second bonding surface 22 of the insert member 20. (FIG. 3). When vibration welding is started with the panel member 12 and the insert member 20 pressed appropriately in a direction in which the two members approach each other, the respective welding ribs 24 begin to melt due to frictional heat. Gradually decreases, and the two members 12 and 20 gradually come close to each other (FIG. 4). Thus, at an appropriate timing after the vibration welding progresses and the welding ribs 24 start melting, the tips of the respective regulating ribs 30 come into contact with the second joining surface 22 of the insert member 20. (FIG. 5).
[0017]
In the welding structure of the resin molded member of such an embodiment, the expansion (flow) of the welding rib 24 that has melted out between the joining surfaces 16 and 22 of the panel member 12 and the insert member 20 at the time of vibration welding is controlled by the regulating rib 30. , So as to be appropriately regulated. With such a configuration, even when the panel member 12 and the insert member 20 are pressed in a direction approaching each other during vibration welding, the welding rib 24 that has melted out between the joint surfaces 16 and 22 causes the insert member 20 to melt. Of the welding rib 24 and the joining surfaces 16 and 22 can be increased in degree of compatibility. Further, as described later, by providing a regulating rib 30 (30A) between the groove 26 recessed in the first joint surface 16 and the welding rib 24 (24A), a part of the fused welding rib 24A is provided. Can be prevented from flowing into the groove 26 (FIG. 6).
[0018]
Operation of the embodiment
Next, the operation of the welding structure of the resin molded member of the embodiment configured as described above will be described with reference to FIGS.
[0019]
Prior to performing the vibration welding, the first bonding surface 16 provided on the panel member 12 and the second bonding surface 22 provided on the insert member 20 are aligned, and each welding rib 24 protruding from the second bonding surface 22 is aligned. Is brought into contact with the first joint surface 16 (FIG. 3). At this time, as described above, the respective regulating ribs 30 provided on the first joint surface 16 have not yet contacted the second joint surface 22.
[0020]
When the positioning between the panel member 12 and the insert member 20 is completed, the panel member 12 and the insert member 20 are appropriately pressed in a direction in which the two members approach each other, and for example, vibration is applied to the insert member 20 so that a predetermined Start vibration welding. As a result, frictional heat is generated at the distal end of each welding rib 24 that is in contact with the first joining surface 16, so that the welding rib 24 starts melting gradually from the distal end (FIG. 4). At this time, the molten portion at the tip end of each welding rib 24 gradually spreads around the welding rib 24 while contacting the first bonding surface 16. Since the panel member 12 and the insert member 20 are appropriately pressed in the direction in which they approach each other, the members 12 and 20 gradually move close to each other as the amount of protrusion of each welding rib 24 decreases as melting proceeds. I will do it.
[0021]
After the vibration welding has proceeded and the welding ribs 24 have begun to melt, the leading ends of the respective regulating ribs 30 are brought into contact with the second joining of the insert members 20 as the panel member 12 and the insert members 20 approach. It comes into contact with the surface 22 (FIG. 5). As a result, the welding rib 24 that is melting is placed in the space 32 closed by the first joining surface 16 of the panel member 12, the second joining surface 22 of the insert member 20, and the regulating ribs 30, 30 adjacent to itself. It is in a confined state, and the flow between the joining surfaces 16 and 22 is restricted from spreading.
[0022]
When the vibration welding further proceeds and the tip of each regulation rib 30 is appropriately softened or melted, the pressed panel member 12 and insert member 20 are allowed to move closer. Along with this, an appropriate pressure is applied from the first joint surface 16 and the second joint surface 22 to the welding rib 24 which is almost completely melted and fills the space 32 (FIG. 5). The welding rib 24 and the first bonding surface 16 and the second bonding surface 22 are in pressure contact with each other, and the welding rib 24 and the first bonding surface 16 and the second bonding surface 22 are in contact with each other. The degree of compatibility increases. Therefore, when the welding rib 24 is solidified under the pressure-contact state, the welding strength between the panel member 12 and the insert member 20 is preferably improved.
[0023]
On the other hand, in FIG. 5, in the regulating ribs 30A protruding at portions adjacent to both sides of the groove portion 26 formed on the first joint surface 16, the welding ribs 24A protruding at positions adjacent thereto are provided. Even if is melted, it is regulated that it flows toward the groove 26 and spreads. Therefore, since a part of the molten welding rib 24A can be prevented from flowing into the groove 26, the inconvenience of solidifying the part of the welding rib 24A in the groove 26 can be suitably prevented.
[0024]
Thereby, when the airbag device 40 is actuated and the pressing force of the airbag 42 is applied, the planned tearing line 18 is appropriately broken, so that the opening of the airbag door 14 is not hindered and the airbag There is no hindrance to the expansion and deployment of 42. Further, when the airbag door 14 is opened after the rupture line 18 is broken, even if the inflating airbag 42 contacts the open end 14a of the airbag door 14, the resin adheres to the open end 14a. Since this is not done, the occurrence of a secondary disaster due to the scattering of resin fragments is also suitably prevented.
[0025]
As described above, in the welding structure of the resin molded member according to the present embodiment, the degree of compatibility between the molten welding rib 24 and the first bonding surface 16 and the second bonding surface 22 can be increased. Can be suitably improved in welding strength. Further, since a part of the molten welding rib 24 can be prevented from flowing into the groove 26 provided on the first joining surface 16, the opening of the airbag door 14 is not hindered, and the resin fragments are scattered. Secondary disasters can also be prevented.
[0026]
In the above embodiment, the welding rib 24 is protruded from the second joining surface 22 provided on the insert member 20 as the second member, and the regulating rib is provided on the first joining surface 16 provided on the panel member 12 as the first member. The case where 30 is protruded is illustrated. However, even if the welding rib 24 is projected from the first joining surface 16 provided on the panel member 12 and the regulating rib 30 is projected from the second joining surface 22 provided on the insert member 20, the same as in the above embodiment. An equivalent effect can be obtained.
[0027]
Further, in the welding structure of the embodiment, as described above, it is possible to prevent a part of the molten welding rib 24 from flowing into the groove 26 provided in the first joint surface 16 of the panel member 12 and, of course, to insert the insert member. Even when a groove is provided on the second joint surface 22 of the joint 20, or when the groove 26 is provided on both joint surfaces 16 and 22, a part of the molten welding rib 24 flows into the groove 26. Can be prevented.
[0028]
The number and location of the welding ribs 24 and the number and location of the regulating ribs 30 adjacent thereto are not limited to those illustrated in the embodiment, and the first joining The size and shape of the surface 16 and the second bonding surface 22 are appropriately changed.
[0029]
In the above-described embodiment, the panel member 12 of the instrument panel 10 is illustrated as the first member, and the insert member 20 is illustrated as the second member. However, the first member and the second member may be any other resin-molded members that are compatible with each other by vibration welding, as well as other components constituting a vehicle interior member and various members.
[0030]
【The invention's effect】
As described above, according to the welding structure of the resin molded member according to the present invention, the degree of compatibility between the molten welding rib and the first bonding surface and the second bonding surface can be increased. There is a beneficial effect that the welding strength with the member can be improved. Further, there is an advantage that a part of the molten welding rib can be prevented from flowing into the groove provided on the first molding surface and / or the second molding surface. Therefore, when the first member and the second member are the panel member provided with the airbag door and the insert member which is vibration-welded to the back side of the airbag door, the opening of the airbag door is not hindered. At the same time, it is possible to prevent occurrence of a secondary disaster due to scattering of resin fragments.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a panel member as a first member and an insert member as a second member adopting a welding structure of a resin molded member according to a preferred embodiment of the present invention in a state before joining.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is an explanatory cross-sectional view showing a process of vibration welding the panel member and the insert member, wherein a first joint surface provided on the panel member and a second joint surface provided on the insert member are aligned; 2 shows a vibration welding preparation state in which welding ribs protruding from the two joining surfaces are brought into contact with the first joining surface.
FIG. 4 is an explanatory cross-sectional view showing a process of vibration-welding the panel member and the insert member, wherein the panel member and the insert member are appropriately pressed in a direction in which both members approach each other, and the vibration is applied to the insert member. , The state in which the distal end portion of each welding rib has begun to melt.
FIG. 5 is an explanatory cross-sectional view showing a process of vibration welding the panel member and the insert member, and each of the regulating ribs protruding from the first joint surface of the panel member by the vibration welding progresses appropriately; The molten welding rib which abuts on the bonding surface is confined in the space closed by the first bonding surface, the second bonding surface and the regulating rib, and is pressurized. This shows that it is prevented from flowing into a groove recessed in the joint surface.
FIG. 6 is a partial cross-sectional view showing a panel member and an insert member welded to each other by the completion of vibration welding.
FIG. 7 is a partial cross-sectional view of an instrument panel formed by vibration welding of a panel member and an insert member at a portion where an airbag door is formed.
FIG. 8 is a cross-sectional view showing the panel member and the insert member shown in FIG. 7 before vibration welding.
FIG. 9 is an explanatory cross-sectional view showing a conventional welding structure when the panel member and the insert member are welded by vibration, and the vibration welding is performed while appropriately pressing the panel member and the insert member toward each other. By starting, the state in which the tip portion of each welding rib has begun to melt is shown.
FIG. 10 is an explanatory cross-sectional view showing a conventional welding structure when a panel member and an insert member are welded by vibration, wherein a molten welding rib flows out between a joining surface of the panel base material and a joining surface of the insert member. When it spreads, it is pushed out from the edge of the insert member, and the appropriate welding and joining of both members is not performed, or a part of the welding rib flows into the groove recessed in the joining surface of the panel member. It also shows that inconvenience occurs.
[Explanation of symbols]
12 panel member (first member), 16 first joining surface 20 insert member (second member), 22 second joining surface 24, 24A welding rib, 26 groove portion 30, 30A regulating rib

Claims (4)

A first joining surface (16) provided on a first member (12) made of a resin material, a second joining surface (22) provided on a second member (20) made of a resin material, and the second joining surface (22) And welding ribs (24, 24A) protruding at required positions of the first joining surface (16), and by applying vibration while abutting the welding ribs (24, 24A) on the first joint surface (16), frictional heat is generated. In a welding structure of a resin molded member, the molten welding ribs (24, 24A) are spread between both joining surfaces (16, 22) to join the two members (12, 20).
A regulating rib (30, 30A) protruding from a required position of the first joining surface (16) toward an adjacent portion appropriately spaced from the welding rib (24, 24A) is provided.
The leading ends of the regulating ribs (30, 30A) are brought into contact with the second joint surface (22) at an appropriate timing after the fusion of the welding ribs (24, 24A) is started, so that the two joint surfaces (16, 22) are brought into contact. 3) The structure for welding a resin molded member, wherein the expansion of the welding ribs (24, 24A) that have melted out between them can be appropriately regulated by the regulating ribs (30, 30A). The welding ribs (24, 24A) regulated by the regulating ribs (30, 30A) are pressurized as the first member (12) and the second member (20) move close to each other, whereby the welding is performed. The welding structure for a resin molded member according to claim 1, wherein the degree of compatibility between the rib (24, 24A) and each of the joining surfaces (16, 22) can be increased. The restricting rib (30A) is located between the groove (26) recessed in the first member (12) and / or the second member (20) and the welding rib (24A), and The welding structure for a resin molded member according to claim 1 or 2, wherein the restricting rib (30A) can prevent the welding rib (24A) from flowing into the groove (26). The first member (12) is a panel member that constitutes an instrument panel for a vehicle, and the second member (20) is an insert member that is vibration-welded to the back side of an airbag door provided on the panel member. The welded structure for a resin molded member according to claim 1, wherein:

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