JP2958050B2 - How to join resin parts - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for joining resin parts, and more particularly, to a method for joining two parts formed of resin while holding a strainer such as a nonwoven fabric or a wire mesh between the two parts. And a method of joining resin parts together.

[Prior art and its problems]

In general, as shown in FIG. 5, the two cases 21 and 22 are sandwiched between two parts formed of resin, for example, between an upper case 21 and a lower case 22 with a strainer 23 made of a nonwoven fabric or a wire mesh. In the case where the two are integrally joined, a horizontal vibration is applied between the two cases 21 and 22 while the strainer 23 is held between the upper case 21 and the lower case
In addition to generating frictional heat between 21, 22, both cases 21,
The two cases 21 and 22 are joined by so-called vibration welding in which pressure is applied from above and below between the two cases and the two cases 21 and 22 are joined together.

However, when the shape of the joint between the two cases 21 and 22 is complicated, or when the strainer 23 is formed into a bag shape and is sandwiched between the two cases 21 and 22, the joint state becomes unstable and the joint is formed. The sealing performance of the part is not perfect.

In addition, when vibration is applied between the two cases 21 and 22, the strainer 23 slides relatively to the two cases 21 and 22, so that the fibers of the strainer 23 are detached or the burrs 24 are formed on the strainer 23. Or the like, the performance of the strainer 23 is deteriorated, and the joint state between the two cases 21 and 22 becomes unstable, resulting in a problem that the sealing performance is deteriorated.

The present invention solves the above-mentioned problems of the prior art, and when two parts are integrally joined while a strainer such as a nonwoven fabric or a wire mesh is sandwiched between the two parts, the present invention is applied to a strainer. It is an object of the present invention to provide a method of joining resin parts, which can securely join between both parts without generating burrs and the like and can completely seal between both parts. .

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention holds a peripheral portion of a strainer between two resin-made parts, and in this state, vibration-welding the two parts to integrally join them. In the method of joining parts, between the one part and the peripheral part of the strainer, a burr stop that covers the peripheral part of the strainer during vibration welding and prevents one part from contacting the peripheral part of the strainer A means is employed in which a guide is interposed and the peripheral edge of the strainer is sandwiched between the two components via the deburring guide when the two components are integrally joined. In addition, while providing a hole in the peripheral portion of the strainer and the deburring guide,
Means in which a part of the other component is inserted into the hole is adopted.

[Action]

According to the present invention, since the peripheral portion of the strainer is covered with the burr stopper guide by employing the above-described means, one of the components is prevented from contacting the peripheral portion of the strainer during vibration welding.

〔Example〕

Hereinafter, embodiments of the present invention shown in the drawings will be described.

1 and 2 show a first embodiment of a method for joining resin parts according to the present invention. FIG. 1 is a schematic sectional view showing a state before joining, and FIG. It is a schematic sectional drawing which shows the state of.

That is, the method of joining resin parts shown in this embodiment is performed between two parts formed of resin, for example, the upper case 1.
And between the lower case 2 and a strainer 3 made of a nonwoven fabric or a wire mesh via a burr stopper guide 4,
Vibration in the horizontal direction is applied between the two cases 1 and 2 to generate frictional heat between the two cases 1 and 2. The space is joined together.

In this case, a projection 8 projecting downward in the figure is formed integrally at the center of the lower surface of the upper case 1, and two steps 9 and 10 are formed on the upper surface of the lower case 2. The two cases 1 and 2 are formed continuously in the upper step 9 in the figure.
The projection 8 of the upper case 1 comes into contact with the upper case 1 at the time of joining, and the peripheral portion of the strainer 3 is provided on the lower step 10 in FIG. Has become.

At both ends of the burr stopper guide 4, a projection 5 for adjusting the amount of crushing of the strainer 3 bent downward in the figure and a projection 6 for preventing burr occurrence bending upward in the figure are provided respectively. .

The strainer 3 provided between the cases 1 and 2
Can be provided between the two cases 1 and 2 as they are, or can be folded and formed into a bag shape,
Or between two.

To sandwich the strainer 3 between the upper case 1 and the lower case 2 configured as described above via the deburring guide 4, first, the burr is inserted into the lower step 10 of the lower case 2. The strainer 3 which is folded back via the stopper guide 4 to form a bag-like shape with a double peripheral edge is positioned.

In this case, the protruding portion 5 bent below the burr stopper guide 4
The outer peripheral surface contacts the lower side of the step 10 on the lower case 2, the inner peripheral surface contacts the outer peripheral edge of the strainer 3, and the lower surface of the deburring guide 4 contacts the upper surface of the strainer 3. To do.

In this way, by positioning the strainer 3 via the deburring guide 4 in the lower step 10 of the lower case 2, the upper step 9 of the lower case 2 A concave portion 11 is formed between the burr stopper guide 4 and the projecting portion 6 that is bent upward, and the concave portion 11 adjusts a stroke during vibration.

Next, the projection 8 on the lower surface of the upper case 1 is brought into contact with the step 9 on the upper side of the lower case 2, and in this state, horizontal vibration is applied between the upper case 1 and the lower case 2 to apply both vibrations. By generating frictional heat between the cases 1 and 2, and further applying pressure between the upper case 1 and the lower case 2 from above and below, and applying vibration and pressure in this way, the two cases 1, 2 As shown in FIG. 2, the strainer 3 is integrally joined along the shape of the recess 11 and the strainer 3 is sandwiched between the two cases 1 and 2 via the deburring guide 4.

In this case, since the upper surface and the outer peripheral edge of the strainer 3 are protected (enclosed) by the deburring guide 4, even when vibration is applied between the two cases 1, 2, the strainer 3 is relatively opposed to the two cases 1, 2. It is possible to completely prevent the fibers from slipping off or causing burrs or the like due to sliding.

The amount of crushing of the strainer 3 when pressurizing between the two cases 1 and 2 can be adjusted by the length of the protrusion 5 for adjusting the amount of crushing of the burr stopper guide 4. , A desired amount of crushing can be obtained. Therefore, even if the sheet-like strainer 3 is used in a single or double form, the two cases 1 and 2 can be surely used.
It can be sandwiched between two.

Further, since the welding margin A between the two cases 1 and 2 can be adjusted by the length of the protrusion 8 provided at the center of the lower surface of the upper case 1, it is necessary to change the length of this protrusion. Accordingly, the joining strength between the two cases 1 and 2 can be adjusted, and therefore, a perfect joining state can always be obtained without being affected by the shape of the joining portion between the two cases 1 and 2.

Therefore, if the method for joining resin parts according to this embodiment is used, the performance of the strainer is reduced due to the occurrence of scratches or burrs on the strainer as in the related art, or the joining state between the two parts is stabilized. Without any deterioration in the sealing performance, without being affected by the shape of the resin parts or the shape of the strainer, ensuring that the strainer is always securely sandwiched between the two parts. It can be joined.

FIGS. 3 and 4 show a second embodiment of the method of joining resin parts according to the present invention. The embodiment shown in FIG. In addition, holes 14 and 13 are provided in the deburring guide 4 and the strainer 3 corresponding to the projection 12, respectively, and the positioning of the strainer 3 is performed by inserting the projection 12 into the holes 14 and 13. Since the other configuration has the same configuration as that of the first embodiment, the same parts as those of the first embodiment are the same as those of the first embodiment. Numbers are given and detailed description of the configuration is omitted.

Also, in the method of joining resin parts shown in this embodiment, similarly to the method shown in the first embodiment, the lower step of the upper case 1 is formed on the upper step 9 of the lower case 2. In this state, a horizontal vibration is applied between the upper case 1 and the lower case 2 to generate frictional heat between the upper case 1 and the lower case 2.
By applying pressure from above and below in the vertical direction, and thus applying vibration and pressure, the two cases 1 and 2 are integrally joined along the shape of the concave portion 11 as shown in FIG. At the same time, the strainer 3 is held between the two cases 1 and 2 via the deburring guide 4.

In this case, since the upper surface and the outer peripheral edge of the strainer 3 are protected (enclosed) by the deburring guide 4, even when vibration is applied between the two cases 1, 2, the strainer 3 is relatively opposed to the two cases 1, 2. It is possible to completely prevent the fibers from slipping off or causing burrs or the like due to sliding.

The amount of crushing of the strainer 3 when pressurizing between the two cases 1 and 2 can be adjusted by the length of the protrusion 5 for adjusting the amount of crushing of the burr stopper guide 4. , A desired amount of crushing can be obtained. Therefore, even if the sheet-like strainer 3 is used in a single or double form, the two cases 1 and 2 can be surely used.
It can be sandwiched between two.

Further, the welding margin between the two cases 1 and 2 can be adjusted by the length of the protrusion 8 provided at the center of the lower surface of the upper case 1. Thus, the joint strength between the two cases 1 and 2 can be adjusted, so that a perfect joint can always be obtained without being affected by the shape of the joint between the two cases 1 and 2.

The lower case 2 is provided with a positioning projection 12, and the burr stopper guide 4 and the strainer 3 are provided with holes through which the projection 12 of the lower case 2 is inserted.
Since the holes 14 and 13 are provided, the strainer 3 is reliably positioned at a predetermined position between the upper case 1 and the lower case 2.

Therefore, even in the method of joining resin parts according to this embodiment, as in the conventional case, scratches or burrs are generated on the strainer, and the performance of the strainer is reduced, or the joining state between the two parts is stable. Without any deterioration in the sealing performance, without being affected by the shape of the resin parts or the shape of the strainer, ensuring that the strainer is always securely sandwiched between the two parts. Can be joined to

〔The invention's effect〕

As described above, according to the present invention, a burr stopper is provided between one component and the peripheral portion of the strainer to cover the peripheral portion of the strainer during vibration welding and prevent one component from contacting the peripheral portion of the strainer. With the guide interposed, the peripheral part of the strainer is sandwiched between the two parts via the deburring guide when the two parts are joined together, so that one part becomes the peripheral part of the strainer during vibration welding. As a result, the strainer is free from scratches, burrs and the like during vibration welding. Therefore, the fibers of the strainer do not come off or burrs do not occur on the strainer, and both parts can be integrally joined while maintaining the initial performance of the strainer. Also, since no burrs or the like are generated on the strainer, the joining state between the two parts does not become unstable due to the presence of the burrs or the like, and the sealing property between the two parts can be improved. Furthermore, by inserting a part of the joint part of the other component into the hole provided in the peripheral part of the strainer and the deburring guide, the peripheral part of the strainer is prevented from falling off between the joint part of the two parts. Therefore, it is possible to provide a stable performance without the strainer falling off.

[Brief description of the drawings]

1 and 2 show a first embodiment of a method for joining resin parts according to the present invention. FIG. 1 is a schematic sectional view showing a state before joining, and FIG. 2 is a schematic sectional view showing a state after joining. Figure, third
FIGS. 4 and 5 show a second embodiment of the method for joining resin parts according to the present invention. FIG. 3 is a schematic sectional view showing a state before joining, FIG. 4 is a schematic sectional view showing a state after joining, and FIG. FIG. 1 is a schematic sectional view showing a conventional method of joining resin parts. 1, 21 ... upper case 2, 22 ... lower case 3, 23 ... strainer 4 ... deburring guide 5 ... protrusion (for adjusting the amount of crushing) 6 ... protrusion (for preventing burr generation) 8, 12 Projection 9, 10 Step 11 Recess 13, 14 Hole 24 Burr

Claims (2)

(57) [Claims] 1. A method for joining resin parts, wherein a peripheral portion of a strainer is sandwiched between two resin parts, and the two parts are vibration-welded and joined together in this state.
A burr stop guide is interposed between the one component and the peripheral edge of the strainer to cover the peripheral edge of the strainer during vibration welding and prevent one component from contacting the peripheral edge of the strainer. A method of joining resin parts, characterized in that a peripheral part of the strainer is sandwiched between the two parts via the deburring guide when the parts are joined together. 2. The method for joining resin parts according to claim 1, wherein holes are provided in a peripheral portion of said strainer and said burr stopper guide, and a part of said other part is inserted into said holes.