JP3618134B2 - Resin molded product and method for producing the same - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a resin molded product in which two plate-shaped resin components facing each other are joined together with a plate-shaped reinforcing component interposed between the two components, and a method for manufacturing the same.
[0002]
[Prior art]
As an example of the resin molded product as described above, there is an automobile glove box lid. This is a plate-shaped reinforcing component sandwiched between a resin lid inner and a resin lid outer. In such a lid, a screw is generally used to connect the three parts of the lid inner, the reinforcing component, and the lid outer.
[0003]
On the other hand, a method of joining resin parts by vibration welding (friction welding) is known. For example, Japanese Patent Application Laid-Open No. 5-77320 describes a case in which upper and lower resin cases are joined by vibration welding and a screen is sandwiched between the two cases. In other words, in this case, a coupling portion that is coupled to both cases by vibration welding and a clamping portion that sandwiches the screen are separately provided, and the portions are obtained by relatively vibrating while pressing the coupling portions of both cases. At this time, the screen is sandwiched between the two cases.
[0004]
[Problems to be solved by the invention]
However, the vibration welding method can eliminate the need for screws, but when the resin parts such as the two cases are relatively vibrated, the sandwiching portion of one resin part is not like the screen. Since the intermediate intermediate product slides, there is a problem that the intermediate intermediate product is displaced.
[0005]
As a means for preventing such a positional shift, it is conceivable to hold the intermediate interposed product from the outside or to position and hold the intermediate product on the resin part itself. However, even if the intermediate interposed article is to be held from the outside, the intermediate holding article positioning and holding means may not be inserted between the resin parts. In addition, even if the intermediate product is positioned and held on the resin component itself, a means for that purpose, for example, a positioning projection must be provided on the back surface of the resin component, and this projection is formed on the surface when molding the resin component. It causes the closing of.
[0006]
That is, an object of the present invention is to provide a resin component in which a plate-shaped reinforcing component is interposed between two opposing plate-shaped resin components and the two components are coupled by vibration welding. An object of the present invention is to enable the reinforcing component to be positioned and held on the resin component without separately adding a positioning-dedicated means.
[0007]
[Means for Solving the Problem and Action]
The present inventor has found that the above-described problems can be solved by using the vibration welding portion of the resin component as a positioning means for the reinforcing component, and has completed the present invention. Hereinafter, the invention according to each claim of the claims will be specifically described.
[0008]
<Invention according to Claim 1>
The present invention is a resin molded product in which two plate-like resin parts facing each other are joined with a plate-like reinforcing part interposed between the two parts,
One resin part is provided with a coupling rib protruding toward the other resin part,
The other resin part is provided with a protrusion protruding toward the one resin part,
The reinforcing part is formed with a fitting portion into which the coupling rib of the one resin part is fitted,
A part of the protrusion of the other resin part is coupled by vibration welding to the coupling rib of the one resin part fitted in the fitting part of the reinforcing part, and the reinforcing part is connected to the remaining part of the protrusion It is characterized by being sandwiched by one resin part.
[0009]
(Function)
In the present invention, the coupling rib of one resin part is coupled by vibration welding with the projection of the other resin part. The coupling rib is fitted to the fitting part of the reinforcement part to thereby reinforce the reinforcement part. Is also positioned and held on the one resin part. Therefore, a dedicated protrusion or the like for positioning and holding the reinforcing component is not necessary for the resin component. In addition, since the reinforcing component is sandwiched between the protrusion of the other resin component vibration-welded to the coupling rib and the one resin component, the play is prevented.
[0010]
<Invention according to Claim 2>
This invention is the resin molded product described in claim 1 above,
The protrusion of the other resin part extends so as to intersect the coupling rib of the one resin part,
The substantially central portion of the coupling rib is recessed over the entire width of the rib,
The substantially central portion of the projection fits into the recess of the coupling rib and is welded to vibration throughout the entire surface including the bottom surface of the recess and the opposing inner surface.
The resin molded product is characterized in that portions on both sides of the projection excluding the substantially central portion are in contact with the reinforcing component so as to sandwich the reinforcing component together with the one resin component.
[0011]
(Function)
In the case of the present invention, the projection of the other resin part fits into the recess of the coupling rib of one resin part and is vibration welded not only to the bottom surface of the recess but also to the opposite inner surfaces of the recess. Since the vibration welding surfaces between the ribs and the protrusions are widened, the connection between the two resin parts becomes strong. Moreover, since the protrusion is fitted in the recess of the coupling rib, the relative displacement movement in the direction perpendicular to the vibration direction between the two resin parts is mechanically prevented by the fitting.
[0012]
<Invention according to claim 3>
This invention is the resin molded product described in claim 1 or claim 2,
Next to the coupling rib of the one resin part, a contact rib having a lower height than the coupling rib is provided integrally with the coupling rib,
In the resin molded product, the reinforcing component is sandwiched between the contact rib and the protrusion of the other resin component.
[0013]
(Function)
In the case of the present invention, the abutment rib reinforces the coupling rib of one of the resin parts so as not to fall sideways, particularly when the vibration direction is a direction perpendicular to the coupling rib. It is effective for increasing the rigidity of the rib.
[0014]
<Invention according to claim 4>
This invention is the resin molded product according to any one of claims 1 to 3,
A peripheral rib extending in the circumferential direction protruding to the side of the other resin part is provided at the peripheral part of the one resin part,
A resin molded product, wherein the peripheral rib is bonded to the other resin component by vibration welding.
[0015]
(Function)
In the present invention, since the peripheral rib of one resin part is vibration welded to the other resin part, coupled with the vibration welding of the coupling rib and the protrusion described above, the two resin parts are further bonded. It will be solid.
[0016]
<Invention according to claim 5>
This invention is the resin molded product according to any one of claims 1 to 4,
The reinforcing component is a molded resin product characterized in that it is made of a hard material that is different in material from the two resin components and does not weld to the resin component.
[0017]
(Function)
Even if the reinforcing part is not vibration welded to the resin part, the protrusion of the other resin part is vibration welded to the coupling rib of one resin part, and the reinforcing part is connected to the one resin part. Since they are sandwiched between them, backlash of the reinforcing parts is prevented.
[0018]
<Invention according to claim 6>
This invention is the resin molded product according to any one of claims 1 to 5,
The one resin part is a lid inner of a glove box of an automobile, and the other resin part is a lid outer of the glove box.
[0019]
(Function)
The lid of the glove box is required to have a certain level of strength in consideration of the occupant's knees and the like being hit, but the reinforcing component gives the lid the necessary strength. In addition, since the lid is provided in the passenger compartment, it is necessary to manufacture the lid in consideration of its appearance, but as described above, the connecting rib also serves as a positioning function for the reinforcing part, and an extra protrusion is provided on the outer lid. Since it is not necessary to provide it, it is advantageous for preventing the surface from being closed and thus improving the appearance of the lid.
[0020]
<Invention according to claim 7>
The present invention is a method suitable for manufacturing the resin molded product according to each of the first to sixth aspects of the present invention, that is, two plate-shaped resin parts facing each other are plate-shaped between the two parts. A method for producing a resin molded product bonded with a reinforcing part of
One resin part is provided with a connecting rib protruding toward the other resin part, and the other resin part is provided with a protrusion protruding toward the one resin part. The reinforcing part is provided with a fitting part into which the coupling rib of the one resin part is fitted,
The coupling rib of the one resin part is fitted into the fitting part of the reinforcing part and protrudes from the fitting part to the other resin part side,
The tip surface of the protrusion of the other resin part is brought into contact with the tip surface of the coupling rib;
While applying pressure to the contact surface between the coupling rib and the protrusion, either one of the two resin parts is vibrated in a direction parallel to the contact surface to thereby frictionally heat the contact surface between the coupling rib and the protrusion. Melt in
The vibration is stopped when the projection comes into contact with the reinforcing component and the reinforcing component is pressed against the one resin component, and the molten portion of the projection and the connecting rib is cooled and solidified. And
[0021]
(Function)
By fitting the fitting part of the reinforcing part into the coupling rib of one resin part, the reinforcing part is positioned and held with respect to the one resin part. Therefore, even when the protrusion of the other resin part is pressed against the coupling rib protruding from the fitting part of the reinforcing part and vibrated, the reinforcing part will not move even if the protrusion slides on the reinforcing part. There is no movement. Due to this vibration, the contact surfaces of the protrusion and the coupling rib are melted by frictional heat, but the melted resin fills the gap between the fitting part of the reinforcing component and the coupling rib, and around the fitting part of the reinforcing component. Therefore, the connection between the reinforcing component and one resin component and the sandwiching of the reinforcing component by both resin components become strong, and the reinforcing component can be securely fixed.
[0022]
In the present invention, the vibration is stopped at the timing when the protrusion comes into contact with the reinforcing part, presses the reinforcing part against the one resin part, and the tip of the protrusion rubs against the reinforcing part and melts slightly. This includes the time when the state is reached.
[0023]
【The invention's effect】
According to the first aspect of the present invention, the reinforcing component is fitted into the coupling rib of one resin component, the protrusion of the other resin component is vibration welded to the coupling rib, and the one resin component In addition, since the reinforcing parts are sandwiched together, the connecting rib performs a function of connecting the resin parts and a function of positioning and holding the reinforcing parts, and the protrusion for positioning the reinforcing parts is not necessary. This is advantageous in preventing the occurrence of shrinkage, and the reinforcing component can be reliably held between the two resin components.
[0024]
According to a second aspect of the present invention, in the resin molded product according to the first aspect, the substantially central portion of the connecting rib is recessed over the entire width of the rib, and the substantially central portion of the protrusion is the recessed portion. The joint rib intersects with the coupling rib and the substantially central portion is vibration welded over the entire inner surface including the bottom surface of the recess and the opposite inner surface, so that the vibration welding surface between the coupling rib and the protrusion is wide. In addition, the fitting between the protrusion and the recess of the coupling rib mechanically prevents the relative displacement movement in the direction perpendicular to the vibration direction between the two resin parts. The parts can be firmly joined, and the number of joining ribs and protrusions for obtaining the required joining strength can be reduced, which is advantageous in preventing the above-mentioned shrinkage.
[0025]
According to a third aspect of the present invention, in the resin molded product according to the first or second aspect, a low-side contact rib is connected to the side of the coupling rib of the one resin part. Since the reinforcing part is sandwiched between the rib and the protrusion of the other resin part, the connecting rib is reinforced by the contact rib, which is advantageous for vibration welding with the protrusion.
[0026]
According to a fourth aspect of the present invention, in the resin molded product according to any one of the first to third aspects, the peripheral side of the one resin part is on the side of the other resin part. Since the peripheral rib protruding in the circumferential direction is provided and the peripheral rib is coupled to the other resin component by vibration welding, the coupling between the two resin components is further strengthened.
[0027]
According to a fifth aspect of the present invention, in the resin molded product according to any one of the first to fourth aspects, the reinforcing component is different in material from the two resin components. The resin part is formed of a hard material that is not welded by vibration. Even in this case, it is possible to prevent the reinforcing part from rattling.
[0028]
According to the invention of claim 6, one resin part of the resin molded product described in any one of claims 1 to 5 is a lid inner of a glove box of an automobile, and the other The resin part is the lid outer of the glove box, but the reinforcing part can give the lid the necessary strength, and can prevent the shrinkage and enhance the appearance of the lid.
[0029]
According to the invention according to claim 7, since the fitting portion of the reinforcing component is fitted to the coupling rib of one resin component to perform vibration welding between the coupling rib and the projection of the other resin component. Even if the protrusion slides on the reinforcing component, the reinforcing component can be prevented from shifting, and the resin melted during the vibration welding can be prevented between the fitting portion of the reinforcing component and the coupling rib. Since the gap is filled and further flows around the fitting part of the reinforcing part and solidifies, it is possible to securely fix the reinforcing part to both resin parts while reliably vibrating and welding both resin parts. This is advantageous for the production of a resin molded product according to each of the first to sixth aspects of the invention.
[0030]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0031]
In this embodiment, the present invention is applied to a lid of a glove box incorporated in an instrument panel of an automobile, and a glove box 1 is shown in FIG. In this glove box 1, 3 is a box portion for storing articles, 5 is a lid provided on the front surface of the box portion, and the glove box 1 is pivotally supported by the instrument panel at the lower end of the box portion 3. It is of the type which exposes the box part 3 by rotating and pulling out.
[0032]
<Structure of lid 5>
As shown in FIG. 2, the lid 5 includes a plate-like lid inner (one resin part) 7 integrally molded with the box portion 3 by a thermoplastic resin, and a plate-like lid also molded by a thermoplastic resin. It consists of an outer (other resin part) 9 and a plate-shaped iron reinforcing part 11, and these parts 7, 9, 11 are all formed in a rectangular shape.
[0033]
The lid inner 7 includes coupling ribs 13 and contact ribs 15 that cross each other in the vicinity of each of the four corners and project outward (on the lid outer side). That is, the coupling rib 13 extends in the vertical direction, and the abutment rib 15 is integrally provided on both sides of the coupling rib 13 and extends in the lateral direction. The abutment rib 15 is lower in height than the coupling rib 13. Yes. A peripheral rib 17 that protrudes outward and extends in the circumferential direction is provided on the peripheral edge of the lid inner 7 over the entire periphery. Further, an operation unit 19 for pulling out the glove box 1 from the instrument panel is provided at the upper center of the lid inner 7.
[0034]
The lid outer 9 is provided with protrusions 21 projecting inward (lid inner side) in the vicinity of each of the four corners. That is, the protrusion 21 extends in the lateral direction so as to be in a positional relationship intersecting with the coupling rib 13. Further, a peripheral rib 23 is provided on the outer periphery of the lid outer 9 so as to project inwardly at the outer periphery of the peripheral rib 17 of the lid inner 7. Further, an operation hole 25 corresponding to the operation portion 19 of the lid inner 7 is provided in the upper center of the lid outer 9.
[0035]
The reinforcing component 11 has four slits: slit-like upper cuts (fitting parts) 27, 27 having upper ends opened upward, and slit-like lower cuts (fitting parts) 29, 29 having lower ends opened downwards. Are provided in the vicinity of each of the four corners. As shown in FIG. 3, these notches 27 and 29 are fitted into the coupling rib 13 of the lid inner 7 to position and hold the reinforcing component 11 on the lid inner 7. In addition, a notch 31 for an operation portion opened upward is formed in the upper center of the reinforcing component 11.
[0036]
As shown in FIGS. 4 to 6, the connecting rib 13 of the lid inner 7 is passed through the notches 27 and 29 of the reinforcing component 11, and the substantially central portion of the connecting rib 13 and the substantially center of the protrusion 21 of the lid outer 9. The parts are connected by vibration welding. The reinforcing component 11 is sandwiched between the abutment rib 15 of the lid inner 7 and the protrusion 21 of the lid outer 9. Further, the peripheral rib 17 of the lid inner 7 is coupled to the flat portion inside the peripheral rib 23 of the lid outer 9 over the entire periphery by vibration welding.
[0037]
The coupling structure of the coupling rib 13 and the projection 21 will be described in detail. As shown in FIG. 7, the substantially central portion of the coupling rib 13 is recessed in a U shape over the entire width of the rib. The coupling rib 13 and the protrusion 21 intersect with each other. The protrusion 21 has a substantially central tip end surface which is vibration welded to the bottom surface 14 a of the U-shaped recess 14, and the upper and lower side surfaces of the approximately central portion of the protrusion 21 are the upper and lower sides of the U-shaped recess 14. These are vibration welded to the inner side surfaces 14b, 14b. That is, the protrusion 21 is vibration welded to the entire inner surface of the recess 14.
[0038]
<Method for manufacturing lid 5>
The lid inner 7 provided with the coupling rib 13, the abutment rib 15, the peripheral rib 17 and the like is integrally formed with the box portion 3 with a thermoplastic resin, and the lid outer 9 provided with the projections 21 and the like is also formed with the thermoplastic resin. . In this case, with respect to the lid inner 7, the height difference between the coupling rib 13 and the abutting rib 15 is made larger than the plate thickness of the reinforcing component 11, and the tip of the coupling rib 13 and the tip of the protrusion 21 of the lid outer 9 are made. The connecting ribs 13 and the peripheral ribs 17 are formed so that the tips of the peripheral ribs 17 are in contact with the flat portion on the inner side of the peripheral ribs 23 of the lid outer 9. The reinforcing component 11 is formed by pressing an iron plate.
[0039]
The lid inner 7 is held by a jig, and the cuts 27 and 29 of the reinforcing component 11 are fitted into the connecting rib 13. Thereby, the reinforcing component 11 is held at a predetermined position with respect to the lid inner 7. The lid outer 9 is covered with the lid outer 9, and the front end surface of the substantially central portion of the projection 21 is brought into contact with the front end surface of the central portion of the coupling rib 13 of the lid inner 7 in an intersecting state. At this time, it contacts the lid outer 5 of the peripheral rib 17 of the lid inner 7 at the same time.
[0040]
In the contact state, while pressing the lid outer 9 against the lid inner 7 with a predetermined pressure, the lid outer 9 is moved to the left and right with a stroke of about 1.5 mm to the arrow A shown in FIG. Vibrate in the direction. By this vibration, the mutual contact surfaces of the lid inner 7 and the lid outer 9 are melted by frictional heat. Since the coupling rib 13 and the projection 21 intersect each other and the vibration direction is perpendicular to the coupling rib 13, the coupling rib 13 is melted and dented only at the substantially central portion where the projection 21 slides. . The protrusion 21 hits the reinforcing component 11 and the reinforcing component 11 is pressed against the abutment rib 15 of the lid inner 7 or the tip of the protrusion 21 is in friction with the reinforcing component 11 and slightly melted. At that time, the vibration is stopped, and the melted portions of the connecting rib 13, the peripheral rib 17 and the protrusion 21 are cooled and solidified. At this time, since the protrusion 21 and the reinforcing component 11 are made of different materials, they are not welded.
[0041]
<Advantages of the above structure and manufacturing method>
As is clear from the above, the reinforcing component 11 is positioned and held on the coupling rib 13 of the lid inner 7, so that it is not necessary to provide the positioning inner projection on the lid inner 7 or the lid outer 9. That is, when such a protrusion is provided on the lid outer 9, it becomes easy to cause a shrinkage on the surface opposite to the surface on which the protrusion is provided at the time of molding, that is, the surface of the lid outer 9, but such a problem is eliminated. .
[0042]
Since the lid inner 7 and the lid outer 9 are coupled not only by the vibration welding of the coupling rib 13 and the protrusion 21 but also by the vibration welding of the peripheral rib 17, the coupling is strong. In particular, the projection 21 fits into the recess 14 of the coupling rib 13 and the projection 21 is vibration welded to the entire surface of the recess 14 of the coupling rib so that the vibration welding surface is wide. 13 and the projection 21 are very strong.
[0043]
The fact that a strong bond is obtained between the coupling rib 13 and the projection 21 in this way means that the desired coupling strength can be achieved even if the number of the coupling rib 13 and the projection 21 provided on the lid inner 7 or the lid outer 9 is reduced. This also means that it is possible to reduce the number of places where the lid inner 7 and the lid outer 9 are closed, and this works favorably in improving the appearance of the glove box 1.
[0044]
Further, in the process of vibration welding, since the resin melted from the coupling rib 13 and the protrusion 21 enters the gap between the coupling rib 13 and the notches 27 and 29 of the reinforcing component, the lid inner 7 and the reinforcing component 11 are coupled. This is advantageous for preventing the reinforcing component 11 from rattling.
[0045]
Further, the abutting ribs 15 provided on the left and right sides of the coupling rib 13 support the coupling rib 13 so as not to fall from the left and right during the vibration welding, which is advantageous in preventing the occurrence of poor welding. .
[0046]
In addition, it cannot be overemphasized that this invention is applicable also to resin molded articles other than the said glove box, and it replaces with the said notches 27 and 29 with which the one end of the longitudinal direction was open | released as a fitting part of the said reinforcement component 11. FIG. Various modifications such as a long and narrow hole closed at both ends are also possible. Furthermore, it goes without saying that the connecting rib 13 and the protrusion 21 can be formed in various shapes such as a circular shape in addition to an elongated shape.
[Brief description of the drawings]
FIG. 1 is a perspective view of a glove box (resin molded product) of an automobile. FIG. 2 is an exploded perspective view of the glove box. FIG. 3 is a front view showing a relationship between a connecting rib and a contact rib of a lid inner and reinforcing parts. FIG. 4 is a cross-sectional view of the glove box. FIG. 5 is a cross-sectional view of the upper part of the lid of the glove box vertically cut at a connecting rib. FIG. FIG. 7 is a cross-sectional view of the rib portion cut laterally. FIG. 7 is an enlarged vertical cross-sectional view of the connecting portion between the connecting rib and the protrusion.
1 Glove box 3 Box part 5 Lid 7 Lid inner (one plastic part)
9 Lid outer (other plastic parts)
DESCRIPTION OF SYMBOLS 11 Reinforcement part 13 Coupling rib 14 Recess 14a Bottom surface 14b Inner side surface 15 Contact rib 17 Peripheral rib 21 Protrusion 27 Cutting (fitting part)
29 Cutting (Fitting part)

Claims (7)

A resin molded product in which two plate-shaped resin parts facing each other are joined with a plate-shaped reinforcing part interposed between the two parts,
One resin part is provided with a coupling rib protruding toward the other resin part,
The other resin part is provided with a protrusion protruding toward the one resin part,
The reinforcing part is formed with a fitting portion into which the coupling rib of the one resin part is fitted,
A part of the protrusion of the other resin part is coupled by vibration welding to the coupling rib of the one resin part fitted in the fitting part of the reinforcing part, and the reinforcing part is connected to the remaining part of the protrusion A resin molded product characterized by being sandwiched by one resin component. In the resin molded product described in claim 1,
The protrusion of the other resin part extends so as to intersect the coupling rib of the one resin part,
The substantially central portion of the coupling rib is recessed over the entire width of the rib,
The substantially central portion of the projection fits into the recess of the coupling rib and is welded to vibration throughout the entire surface including the bottom surface of the recess and the opposing inner surface.
A resin molded product characterized in that portions on both sides of the protrusion except for the substantially central portion are in contact with the reinforcing component so as to sandwich the reinforcing component together with the one resin component. In the resin molded product described in claim 1 or claim 2,
Next to the coupling rib of the one resin part, a contact rib having a lower height than the coupling rib is provided integrally with the coupling rib,
A resin molded product, wherein the reinforcing component is sandwiched between the contact rib and the protrusion of the other resin component. In the resin molded product according to any one of claims 1 to 3,
A peripheral rib extending in the circumferential direction protruding to the side of the other resin part is provided at the peripheral part of the one resin part,
A resin molded product, wherein the peripheral rib is bonded to the other resin component by vibration welding. In the resin molded product according to any one of claims 1 to 4,
A resin molded product, wherein the reinforcing component is formed of a hard material which is different in material from the two resin components and does not vibrate with the resin component. In the resin molded product according to any one of claims 1 to 5,
One of the resin parts is a lid inner of an automobile glove box, and the other resin part is a lid outer of the glove box. A method of manufacturing a resin molded product in which two plate-shaped resin parts facing each other are joined with a plate-shaped reinforcing part interposed between the two parts,
One resin part is provided with a connecting rib protruding toward the other resin part, and the other resin part is provided with a protrusion protruding toward the one resin part. The reinforcing part is provided with a fitting part into which the coupling rib of the one resin part is fitted,
The coupling rib of the one resin part is fitted into the fitting part of the reinforcing part and protrudes from the fitting part to the other resin part side,
The tip surface of the protrusion of the other resin part is brought into contact with the tip surface of the coupling rib;
While applying pressure to the contact surface between the coupling rib and the protrusion, either one of the two resin parts is vibrated in a direction parallel to the contact surface to thereby frictionally heat the contact surface between the coupling rib and the protrusion. Melt in
The vibration is stopped when the projection comes into contact with the reinforcing component and the reinforcing component is pressed against the one resin component, and the molten portion of the projection and the connecting rib is cooled and solidified. A method for producing a resin molded product.

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