JP3344026B2 - Method of manufacturing resin pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin pipe.

[0002]

2. Description of the Related Art Conventionally, as a resin pipe of this kind,
The one disclosed in Japanese Utility Model Publication No. 5-18132 is known and is shown in FIG. Resin pipe 70 shown in FIG.
Has a lower piece 73 having two openings 71 and 72;
The upper piece 74 has no opening, and the dividing line 75 between the lower piece 73 and the upper piece 74 has an endless loop shape that does not appear in the openings 71 and 72.

Here, a method of manufacturing the resin pipe 70 will be briefly described.

First, a lower piece 73 and an upper piece 74
Are respectively formed by injection molding. Then, the lower piece 7
A resin pipe 70 is obtained by superimposing the upper piece 74 on 3 and joining the upper piece 74 to the lower piece 73 by vibration welding. Here, the vibration welding is a kind of friction welding in which the mutually divided surfaces of two materials are rubbed together at a high speed in a compressed state, and the two materials are melt-bonded by the heat generated at this time. Accordingly, in FIG. 8, the lower piece 73 is compressed upward in the figure, and the upper piece 74 is compressed downward in the figure.

[0005]

In the resin pipe 70 described above, as shown in FIGS. 9 and 10, an inclined portion 75a that is inclined with respect to the compression direction at the time of vibration welding is present in the divided line 75. However, as shown in FIG. 9, the angle α between the inclined portion 75a and a plane perpendicular to the compression direction is 45 °.
When it is larger than °, the surface pressure is not ensured at the inclined portion 75a during the vibration welding, and the welding at the inclined portion 75a may be insufficient.

Here, when the lower piece 73 having two openings 71 and 72 is formed by injection molding, the opening 7
The flat portion 75b and the inclined portion 7 of the dividing line 75 are obtained from
Insert a cylindrical core mold up to the point of contact with 5a, and after injection molding, insert the core mold from the above-described position into the opening 71,
It is common to remove via 72. This allows
From the opening 71 to the contact point between the inclined portion 75a and the flat portion 75b, and from the opening 72 to the inclined portion 75a and the flat portion 75b.
The lower piece 73, that is, the resin pipe 70, up to the point of contact with the contact member cannot be formed into a euploid structure. Therefore, FIG.
As shown in FIG. 0, when the angle α between the inclined portion 75a and the plane perpendicular to the compression direction is smaller than 45 °, the inclined portion 75a becomes longer, and as a result, the inclined portion 75a extends from the openings 71 and 72. The distance between the contact point between the flat portion 75a and the flat portion 75b (the portion that cannot be formed into a euphemous structure) becomes long, and the shape of the resin pipe 70 is considerably restricted.

Therefore, an object of the present invention is to shorten the length of the inclined portion of the dividing line and to secure the surface pressure of the inclined portion during vibration welding.

[0008]

The technical means taken in the present invention to solve the above technical problem is that a first divided body having one opening and a second divided body having at least one opening are provided. A body, and a dividing line that divides the first divided body and the second divided body, and is provided so as to avoid openings of the first and second divided bodies, and which one of the first and second divided bodies is provided. A first inclined portion obliquely inclined downward from the vicinity of the opening of one of the first inclined portion, a horizontal portion extending in parallel to the axial direction from a lowermost portion of the first inclined portion, and an end of a horizontal portion furthest away from the lowermost portion And a second inclined portion inclined downward to a position close to the opening of the other of the first and second divided bodies, the first and second divided bodies being formed by injection molding. Each of the two divided bodies is formed, and then the first and second divided bodies are overlapped via a dividing line, Is that which is integrally joined to the first and second divided body by vibration welding in a state of tilting the first and second divided bodies relative to the compression direction and a plane perpendicular during movement welding.

Here, the above-mentioned axial direction means the longitudinal direction of the resin pipe.

[0010]

According to the above-mentioned technical means, the first inclined portion inclined downward from the vicinity of the opening of one of the first and second divided bodies, and the shaft extending from the lowermost portion of the first inclined portion. A horizontal portion extending in parallel with the direction, and an obliquely downward movement from an end of the horizontal portion farthest from the lowermost portion of the first inclined portion to a vicinity of an opening of the other of the first and second divided bodies. The first and second divided bodies divided by the dividing line having the second inclined portion are vibration-welded in a state of being inclined with respect to a plane perpendicular to the compression direction. Angle (45
° or more), the surface pressure at the first and second inclined portions is secured during vibration welding, and as a result, the first and second inclined portions are sufficiently welded.

For the above reasons, the lengths of the first and second inclined portions can be reduced, so that the distance from one opening to the lowermost portion of the first inclined portion and the uppermost portion of the second inclined portion to the other opening are reduced. The distance to the part is also shortened, the part that can be formed into a euploid structure increases, and the degree of freedom in the shape of the resin pipe increases.

[0012]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a resin pipe according to this embodiment, FIG. 2 is a sectional view of FIG. 1, and FIG.
It is -A sectional drawing.

A resin pipe 10 shown in FIG. 1 comprises a resin pipe main body 11 and a flange 12, and the resin pipe main body 11 has a lower piece (first divided body) having one opening 13. 15 and an upper piece (second divided body) 16 having one opening 14. The lower piece 15 and the upper piece 16 are each formed by injection molding in a state of being divided by the division line 17.

As shown in FIG.
The first inclined portion 18 sloping downward from the vicinity of the opening 13 at an angle β of 45 ° or more with respect to the axial direction of the resin pipe 10, that is, the longitudinal direction, and the shaft 18 extends from the lowermost portion 18 a of the first inclined portion 18. A horizontal portion 19 extending in parallel to the horizontal direction, and a second inclined portion 20 sloping downward at an angle β of 45 ° or more with respect to the axial direction from the right end 19 a of the horizontal portion 19 to the vicinity of the opening 14. It is configured.

As shown in FIG. 3, a lower welding flange 21 is formed on the lower piece 15 so as to protrude outward along the dividing line 17, and the upper piece 16 is also provided with the dividing line 1.
An upper welding flange 22 protruding outward along 7 is formed. Therefore, vibration welding is performed by vibrating the lower welding flange 21 and the upper welding flange 22 in the state of being overlapped with each other in the illustrated left and right direction and compressing the lower piece 15 upward and the upper piece 16 downward. .

FIG. 4 is an enlarged sectional view of a main part of a divided portion before vibration welding.

The upper welding flange 22 is provided with a first ridge 23 projecting downward, and the lower welding flange 21 is provided with two grooves 24 and two grooves 2 parallel to each other.
4 and a second ridge 25 protruding upward. Then, at the time of vibration welding, the first ridge 23 and the second ridge 25 are pressed against each other. At this time, welding burrs generated by welding enter the groove 16 and are prevented from being exposed to the outside.

Referring to FIGS. 5 and 6, a method of manufacturing the resin pipe 10 configured as described above will be described. Here, FIG. 5 is a schematic view of a forming apparatus for forming the upper piece 16 with a flange, and FIG. 6 is an explanatory view showing a vibration welding method.

First, as shown in FIG. 5, a cylindrical core mold 30 is divided between an upper mold 27 and a lower mold 28 by a dividing line 17.
The molten thermoplastic resin is injected at a predetermined pressure into the cavity 29 having the shape of the upper piece 16 with the flange 12 in a state of being inserted to a position corresponding to the right end portion 19a of the horizontal portion 19 of FIG. Next, by cooling the upper mold 27 and the lower mold 28, the thermoplastic resin filled in the cavity 29 is solidified to form the upper piece 16 with the flange 12. After that, the core mold 30 is moved to the left in the figure to form the molding device 26.
, And finally the upper piece 16 with the flange 12 is taken out of the molding device 26. On the other hand, since the lower piece 15 with the flange 12 is formed in the same manner as the upper piece 16 with the flange 12, the description is omitted.

Next, the lower piece 15 with the flange 12 and the upper piece 16 with the flange 12 are joined by vibration welding. More specifically, as shown in FIG. 6, a lower piece 15 with a flange 12 and an upper piece 16 with a flange 12
In a state of being overlapped by the dividing line 17 with respect to a plane perpendicular to the compression direction at the time of vibration welding, by a predetermined angle γ. Here, this angle γ is β−45 ° to 45 ° (where β> 45 °)
If the angle is smaller than β−45 °, it is difficult to secure the surface pressure in the first and second inclined portions 18 and 20,
If it is larger than 45 °, it becomes difficult to secure the surface pressure in the horizontal portion 19. In a state where the lower piece 15 with the flange 12 and the upper piece 16 with the flange 12 are inclined by a predetermined angle γ, the lower piece 15 is compressed upward in the drawing, and the upper piece 16 is compressed downward in the drawing while the dividing line 17 is compressed.
To vibrate. At this time, the first and second inclined portions 18 and 2
Even if the angle between 0 and the horizontal portion 19 is set to 45 ° or more, the first and second inclined portions 18 and 20 during vibration welding and the plane perpendicular to the compression direction can be adjusted by adjusting the angle γ described above. Can be made smaller than 45 °. Therefore, surface pressure is secured in the first and second inclined portions 18 and 19, and welding is sufficiently performed. As a result, the division line 17 generates heat and melts, so that the lower piece 15 with the flange 12 and the upper piece 16 with the flange 12 are firmly joined.

As described above, in this embodiment,
A first inclined portion 18 sloping downward from the vicinity of the opening 13,
A horizontal portion 19 extending in parallel with the axial direction from the lowermost portion 18a of the first inclined portion 18 and a downward portion from the end portion 19a of the horizontal portion farthest from the lowermost portion 18a of the first inclined portion 18 to the vicinity of the opening 14. Dividing line 1 having second sloping portion 20 sloping
Since the lower piece 15 with the flange 12 and the upper piece 16 with the flange 12 divided by 7 are vibration-welded in a state of being inclined with respect to a plane perpendicular to the compression direction, the first and second pieces are formed.
Even if the angle between the inclined portions 18 and 20 and the axial direction of the resin pipe 10 is large (45 ° or more), the surface pressure is ensured in the first and second inclined portions 18 and 20 during vibration welding, and as a result, The first and second inclined portions 18 and 20 can be sufficiently welded.

For the above reasons, the first and second inclined portions 18,
Since the angle between the shaft 20 and the axial direction of the resin pipe 10 can be increased, the lengths of the first and second inclined portions can be reduced.
As a result, the lowermost portion 18 of the first inclined portion 18 extends from the opening 13.
2 and the distance from the right end portion 19a of the horizontal portion 19 to the opening portion 14 in FIG. 2 are also reduced, so that a portion that can be formed into a euploid structure increases, and the degree of freedom of the shape of the resin pipe 10 increases.

Further, according to the configuration and the manufacturing method of the resin pipe 40 described above, the portion (inner peripheral surface of the resin pipe 40) that can be formed into a euploid structure is increased, so that the resin pipe 40 is gradually eupled. Becomes possible, and the resin pipe 40
Is applied to a fluid tube such as an intake manifold,
The flow resistance of the working fluid can be reduced.

In this embodiment, the lower piece 15 having one opening 13 and the upper piece 16 having one opening 14 are integrated by vibration welding, but the present invention is not limited to this. There is no necessity, and the present invention can be applied to a case where one of the lower piece 15 and the upper piece 16 has a plurality of openings and the other has one opening as shown in FIG. Here, FIG. 7 shows two openings 4
This is an example in which a lower piece (not shown) having the first and second pieces 42 is integrated with an upper piece 44 having one opening 43.

In this embodiment, when the angle between the first inclined portion 18 and the axial direction of the resin pipe 10 matches the angle between the second inclined portion 20 and the axial direction of the resin pipe 10. However, the present invention is not necessarily limited to this, and can be applied to a case where both are different.

[0027]

The present invention has the following effects.

Even if the angle between the first and second inclined portions and the axial direction is large (45 ° or more), the surface pressure at the first and second inclined portions can be ensured during vibration welding.
The inclined portion can be sufficiently welded.

Also, since the lengths of the first and second inclined portions can be reduced, the distance from one opening to the lowermost portion of the first inclined portion and the distance from the uppermost portion of the second inclined portion to the other opening can be reduced. The distance becomes shorter, more parts can be formed into a euphemous structure, and the degree of freedom of the shape of the resin pipe increases.

[Brief description of the drawings]

FIG. 1 is a perspective view of a resin pipe according to the present embodiment.

FIG. 2 is a sectional view of FIG. 1 showing a dividing line.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view of a main part showing a configuration of a welded portion before vibration welding.

FIG. 5 is a sectional view of a main part of an injection molding apparatus for injection molding an upper piece with a flange.

FIG. 6 is an explanatory diagram showing a vibration welding method according to the present embodiment.

FIG. 7 is a plan view of a modification.

FIG. 8 is a perspective view of a conventional resin pipe.

FIG. 9 shows that the angle between the inclined portion of the dividing line and the axial direction is 4
It is explanatory drawing of the resin pipe which concerns on a prior art in the case of being larger than 5 degrees.

FIG. 10 is an explanatory view of a resin pipe according to the related art when the angle between the inclined portion of the dividing line and the axial direction is smaller than 45 °.

[Explanation of symbols]

Reference Signs List 10 resin pipe 13 opening (opening of one of first and second divided bodies) 14 opening (opening of the other of first and second divided bodies) 15 lower piece (1st divided body) 16 Upper piece (2nd divided body) 17 Dividing line 18 1st inclined part 18a Lowermost part of first inclined part 19 Horizontal part 19a Right end of horizontal part (most from lowermost part of first inclined part) (End of horizontal part that is far away) 20 second inclined part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 65/06 B29L 23:00

Claims (1)

(57) [Claims] A first divided body having one opening; a second divided body having at least one opening; dividing the first divided body and the second divided body into the first divided body;
And a dividing line provided so as to avoid the opening of the second divided body, wherein the dividing line is inclined downward from the vicinity of the opening of one of the first and second divided bodies. A first inclined portion, a horizontal portion extending in parallel in the axial direction from the lowermost portion of the first inclined portion, and the other of the first and second divided bodies from an end of the horizontal portion farthest from the lowermost portion A method of manufacturing a resin pipe, comprising: a second inclined portion that is inclined downward to a position near the opening portion of the resin pipe, wherein the first and second divided bodies are formed by injection molding, respectively.
Thereafter, the first and second divided bodies are overlapped via the dividing line, and the first and second divided bodies are vibration-welded in a state where the first and second divided bodies are inclined with respect to a plane perpendicular to a compression direction at the time of vibration welding. A method for manufacturing a resin pipe, wherein the first and second divided bodies are integrally joined.