JPH0952251A - Manufacture of air outlet grill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the smooth rotating operation of a wind direction deflecting plate. SOLUTION: A plurality of longitudinal blades 3 are resin molded in a parallel state in the first step. At this time, the recess 11 of a circular sectional shape extended in the direction parallel to the axial direction of the blades 3 is molded by the protrusion 23a of a first slide core 23, and a small-diameter hole 12 of the recess 11 and shaft holes 7a, 7b are molded by the pins 25a to 25c of the cores 23, 24. In such a case, the holes 7a, 7b and the recess 11 of the blade 3 molded by the cores 23, 24 are not deformed due to the positional deviation of a mold, and the sites are always molded in a true circular state. Thereafter, in the second step after the blades 3 are molded, a barrel 2 and a coupling rod 8 are resin molded. At this time, the disc part 14 (and the central shaft 15) of the rod 14 in the recess 11 is molded with the support shafts 6a, 6b of the barrel 2 in the holes 7a, 7b.

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 an outlet grill made of a thermoplastic resin.

[0002]

2. Description of the Related Art In this type of outlet grille, a plurality of wind direction deflecting plates are pivotally supported by a main body case, and the plurality of wind direction deflecting plates are integrally connected by a connecting member. FIG. 8 shows a configuration of a wind direction deflecting plate (blade) and a connecting member (connecting rod) in the prior art. That is,
As shown in FIG. 8, the wind direction deflecting plate 41 has a pair of upper and lower support shafts 42 coaxially formed, and a connecting pin 43 extending in a direction parallel to the axial direction of the support shaft 42. The head of the connecting pin 43 is formed by bulging into a spherical shape. The connecting pin 43 is inserted into the through hole 45 formed in the connecting rod 44, so that the wind direction deflecting plate 41 is integrally operable.

Further, as a method of forming a series of wind direction deflecting plates as described above, for example, JP-A-63-282450 is known. That is, according to the above publication, a cavity is formed by using a split mold that is divided along the axial direction of the support shaft 42 of the wind direction deflecting plate 41 or the connecting pin 43, and the melted thermoplastic resin is injected into the cavity. It And
After the molten resin is solidified, the movable part of the mold device is replaced, another thermoplastic resin is injected into the cavity of the mold device, and the connecting rod 44 is formed to connect the series of connecting pins 43. . In addition, as described in the above publication, a method of resin-molding different members by two injection moldings is as follows.
It is generally called a two-color molding method.

[0004]

However, in the air outlet grill of the above-mentioned conventional publication, when the connecting pin 43 is resin-molded, the cross-sectional shape of the connecting pin 43 is not a perfect circle due to the positional deviation on the mating surface of the split mold. (See Figure 9),
Due to this, there is a problem that a smooth turning operation of the wind direction deflecting plate 41 cannot be obtained. In addition, burrs (protruding resin) on the mating surfaces of the split molds also hinder smooth rotation.

The present invention has been made in view of the above problems, and an object of the invention is to provide a method for manufacturing an outlet grill which can realize a smooth rotating operation of a wind direction deflecting plate. To do.

[0006]

In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of wind direction deflecting plates in a parallel state are injection-molded by a first thermoplastic resin.
And a second step of injection-molding a connecting member for integrally rotating the plurality of wind direction deflecting plates with the second thermoplastic resin after the resin is solidified in the first step. A method for manufacturing an outlet grill having the method, wherein in the first step, a rotation direction of the wind direction deflection plate is provided, which has a protrusion having a circular cross section that protrudes in a direction parallel to a rotation axis direction of the wind direction deflection plate. The concave portion of the wind direction deflecting plate is formed by using the first slide core that is slidable in parallel to the axial direction, and in the second step, the molten resin is filled in the cavity formed by the concave portion and the second slide core. The gist is to fill and mold the fitting portion of the connecting member.

According to a second aspect of the present invention, in the first aspect of the invention, the protrusion of the first slide core is
It has a tapered surface that expands in diameter as it approaches the tip. Claim 3
According to the invention described in claim 1, in the invention described in claim 1 or 2, a shaft pin having a perfect circular cross section projects from the shaft center of the projection of the first slide core.

[0008] In the invention described in claim 4, claims 1 to 3 are provided.
In any one of the above aspects, in the second step, the connection member is resin-molded, and at the same time, the main body case that pivotally supports the plurality of wind direction deflection plates in a parallel state is resin-molded.

(Operation) According to the invention described in claim 1,
In the first step, a plurality of wind direction deflecting plates are injection-molded in parallel with the first thermoplastic resin. At this time, the first slide core that has a protrusion having a circular cross section that projects in a direction parallel to the rotation axis direction of the wind direction deflection plate and is slidable parallel to the rotation axis direction of the wind direction deflection plate is used. As a result, the concave portion of the wind direction deflecting plate is formed. In addition, after the resin has been solidified in the first step, in the second step, a connection member for integrally rotating the plurality of wind direction deflecting plates is injection-molded with the second thermoplastic resin. At this time, the cavity formed by the concave portion of the wind direction deflecting plate and the second slide core is filled with the molten resin, and the fitting portion of the connecting member is molded.

In other words, the concave portion of the wind direction deflecting plate formed by the first slide core is always formed in a perfect circular shape without any deformation or burrs occurring due to the displacement of the mold device. In addition, the fitting part of the connecting member is also molded into a perfect circle,
As a result, a smooth turning operation of the wind direction deflecting plate is realized.

According to the second aspect of the present invention, the concave portion of the wind direction deflecting plate is formed in an inversely tapered cross section, and the connecting member is formed in the concave portion. In this case, the taper surfaces of the concave portion of the wind direction deflecting plate and the fitting portion of the connecting member that face each other prevent the connecting member from falling off.

According to the third aspect of the present invention, the hole corresponding to the axial pin of the slide core is formed at the center of the recess of the wind direction deflecting plate, and the connecting member is formed in the recess including the hole. Will be. As a result, the fitting portion of the connecting member is rotated around the center of the recess, and the rotation operation of the wind direction deflecting plate is further smoothed.

According to the fourth aspect of the present invention, in the second step, the connecting member is resin-molded, and at the same time, the main body case that pivotally supports the plurality of wind direction deflecting plates in parallel is resin-molded. In this case, the blowout port grill is manufactured by a series of resin molding steps without requiring the work of assembling each member, and the workability can be improved and the manufacturing cost can be reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in an air-conditioning outlet grille assembled to an instrument panel of an automobile will be described with reference to the drawings.

FIGS. 1 to 4 are views showing the overall construction of the outlet grill in the present embodiment. 1 is a front view of the outlet grille, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 4 is a bottom view of the outlet grille ( However, FIGS. 3 and 4 show a state in which the wind direction is slightly changed). In each drawing, the outlet grill 1 is arranged in a blower duct, and the air blown from the air conditioner is from the rear (left side in FIG. 2) to the front (right side in FIG. 2) of the outlet grill 1. Is blown out to.

The outlet grille 1 is composed of a barrel 2 through which air from a blower duct passes, and a plurality of (in the present embodiment, five) wind direction deflecting plates (hereinafter, referred to as "barrel 2") arranged in parallel on the rear side of the barrel 2. A vertical blade) 3 and a connecting rod (connecting member) 4 that connects the braces 3 so that they can be integrally operated. The vertical blade 3 is made of ABS (acrylonitrile styrene butadiene) as the first thermoplastic resin, and the barrel 2 and the connecting rod 4 are made of PP (polypropylene) as the second thermoplastic resin. There is.

The structure of each member 2 to 4 will be described in detail below. The barrel 2 is formed with a plurality of wind direction deflecting plates (hereinafter referred to as horizontal blades) 5 extending in the left-right lateral direction, and a semi-circular cutout 5a is formed at the rear end of the horizontal blade 5 (FIG. 3).
Shown). Support shafts 6a and 6b for supporting the vertical blade 3 are coaxially projectingly formed at vertically symmetrical positions on the inner surface of the barrel 2. The barrel 2 is rotatably supported in the up-down direction by support shafts (not shown) on both left and right sides.

The structure of the vertical blade 3 will be described with reference to FIGS. 2 and 5 (however, FIG. 5 shows the vertical blade 3 upside down). Shaft holes 7a and 7b are coaxially formed in the upper and lower surfaces of the front end of the vertical blade 3. Further, at the front end portion of the vertical blade 3, stepped portions 8 having a circular cross section are formed coaxially with the shaft holes 7a and 7b at four upper and lower positions. The step portion 8 has a completely circular cross section so that it can be uniformly contracted during resin molding. The vertical blade 3 located at the center is integrally formed with an operating lever 9 that protrudes forward of the barrel 2. A recess 10 extending rearward from the front end of the blade is formed near the shaft hole 7b.

Behind the shaft hole 7b, there is formed a recess 11 having a circular planar shape and a tapered surface whose diameter increases toward the bottom. A small diameter hole 12 is formed in the center of the recess 11. There is. In this embodiment, the tapered surface of the recess 11 is formed at an angle of about 10 ° with respect to the axial direction of the vertical blade 3.

Next, the structure of the connecting rod 4 is shown in FIGS.
This will be described with reference to FIG. The connecting rod 4 has a long plate-shaped rod portion 13 and a disc portion (fitting portion) 14 formed at the same intervals as the support shafts 6a and 6b of the barrel 2, and the center of the disc portion 14 is formed. A central shaft 15 is formed in the. The vertical cross-sectional shape of the disk portion 14 matches the vertical cross-sectional shape of the concave portion 11 of the vertical blade 3, and the disk portion 14 has a tapered surface whose diameter increases toward the central axis 15.

In the outlet grill 1 constructed as described above, the vertical blades 3 are moved relative to the barrel 2 by the engagement between the support shafts 6a, 6b of the barrel 2 and the shaft holes 7a, 7b of the vertical blades 3. It is rotatably supported. In such a case, the disc portion 14 of the connecting rod 4 may be the concave portion 11 of the vertical blade 3.
When the vertical blade 3 group is fitted to the shaft hole 7a,
7b operate | moves simultaneously centering on 7b as a rotation center (rotation axis).

On the other hand, the outlet grill 1 is manufactured by a two-color molding method using a synthetic resin, and the manufacturing process of the outlet grill 1 will be described below with reference to FIGS. 7 (a) and 7 (b). To do.

In FIG. 7A, the blade cavity 31 includes a fixed mold 21, a movable mold 22 movable in the vertical direction in the figure, and a first left and right movable mold in the horizontal direction in the figure.
And the slide cores 23 and 24 of FIG. The first slide core 23 located on the left side of the drawing is provided with a substantially columnar protrusion 23a protruding in a direction parallel to the axial direction of the vertical blade 3 (extending direction of the support shafts 6a and 6b). ing.
Further, pins (shaft pins) 25a, 25b processed into a perfect circle in cross section are embedded in the first slide cores 23, 24, and the tips thereof project into the blade cavity 31. In this case, one pin 25a projects from the central position of the protrusion 23a.

Also, a pin 25c having a perfect circular cross section is embedded in the first slide core 24 located on the right side in the drawing so as to be parallel to the axial direction of the vertical blade 3, and the pin 25c is The tip projects into the blade cavity 31. The movable mold 22 is provided with a gate portion 26 that communicates with the blade cavity 31. Although the gate portion 26 is open at the position of the step portion 8 of the vertical blade 3, its opening width is shorter than the width of the step portion 8. This prevents the resin from squeezing out from both end surfaces of the stepped portion 8.

Molten resin (ABS) is injected into the blade cavity 31 through the gate portion 26.
After that, when the vertical blade 3 is solidified and molded in the cavity 31, first, the movable mold 22 moves downward,
Following that, the left and right first slide cores 23, 24 move to the left and right sides. At this time, the depression 10 of the vertical blade 3
The vicinity of the vertical blade 3 is flexibly deformed to some extent, so that the concave portion 11 of the vertical blade 3 is projected to the projection 23 of the first slide core 23.
There is no loss of a and the edge portion near the recess 11 is not damaged.

After the vertical blade 3 is molded, as shown in FIG. 7 (b), the fixed mold 21, the movable mold 27, and the left and right second molds are formed.
The slide cores 28 and 29 form a barrel cavity 32 and a rod cavity 33. And
Molten resin (PP) is injected into the cavities 32 and 33 from a gate portion (not shown), and the barrel 2 and the connecting rod 4 are molded by solidifying the resin. The melting temperature of ABS injected first is 210 ° C, and the temperature of PP injected later is PP.
Has a melting temperature of 170 ° C. Then, when each mold is removed, the outlet grille 1 shown in FIGS. 1 to 4 is obtained.

The following effects can be obtained in the outlet grill 1 of the present embodiment configured as described above. That is, in the present embodiment, as the first step, the plurality of vertical blades 3 are resin-molded in a parallel state. At this time, the first slide core 23 is used to form the circular recess 11 extending in the direction parallel to the axial direction of the vertical blade 3, and further the pins 25a to 25c of the first slide cores 23 and 24 are formed. The small diameter hole 12 and the shaft holes 7a and 7b of the recess 11 are formed by using the above. Then, as a second step after the formation of the vertical blade 3, the mold is exchanged and the barrel 2 and the connecting rod 4 are replaced.
Was resin molded. At this time, the connecting rod 4 is inserted into the recess 11.
The disk portion 14 (and the central shaft 15) of the above is formed with the support shafts 6a and 6b of the barrel 2 in the shaft holes 7a and 7b.

In short, since the shaft of the wind direction deflecting plate (the support shaft 42 and the connecting pin 43 in FIG. 8) has been conventionally molded by the split mold, the positional deviation and burrs of the mold device on the mating surface of the split mold are vertical. Although it hinders the smooth rotation of the blade 3, this problem can be solved by the configuration of the present embodiment. That is, the first slide cores 23, 24
In the axial holes 7a, 7b and the recess 11 of the vertical blade 3 formed in step 1, there is no problem due to misalignment of the mold device or burrs, and these axial holes 7a, 7b and the recess 11 are formed.
Is always rounded. In such a case, the shaft holes 7a, 7
The support shafts 6a and 6b of the barrel 2 and the disc portion 14 of the connecting rod 4, which are formed by using b and the recess 11 as cavities, are also formed into perfect circles. As a result, the contact surface of each member slides smoothly, and the vertical blade 3 can be smoothly rotated.

Further, the protrusion 23 of the first slide core 23
a is expanded toward the tip, and the slide core 23
Thus, the concave portion 11 of the vertical blade 3 was formed into a tapered cross section. In this case, the concave portion 11 of the vertical blade 3 and the connecting rod 4
With the tapered surfaces facing the disk portion 14, the connecting rod can be prevented from falling off.

Further, since the barrel 2 and the connecting rod 4 are formed by resin molding at the same time, the work of assembling each member individually becomes unnecessary, and the workability can be improved and the manufacturing cost can be reduced.

The present invention can be embodied as follows in addition to the above embodiment. (1) In the above embodiment, the first slide cores 23, 2
Although the shaft holes 7a and 7b of the vertical blade 3 and the central shaft 15 of the recess 11 are formed by the pins (shaft pins) 25a to 25c embedded in the shaft 4, the shaft pins are replaced by the first shaft pins 25a to 25c. It may be molded integrally with the slide core 23. Further, the shaft pin can be omitted in the protrusion 23a of the first slide core 23.

(2) In the above-described embodiment, the horizontal blade 5 is fixed to the barrel 2 and the vertical blade 3 can be integrally operated with the connecting rod 4, but it is of course possible to reverse this. (3) In the above-described embodiment, the barrel 2, the vertical blade 3, and the connecting rod 4 are formed of two different thermoplastic resins. However, as long as they can be rotated with respect to each other,
You may make it shape | mold with the same resin.

The technical idea which is not described in each claim of the claims and which is understood from the above-described embodiment will be described below together with its effect. 5. The method for manufacturing an outlet grill according to claim 4, wherein the first slide cores (23, 24) on both the left and right sides extend on the axis of the rotating shaft of the wind direction deflecting plate (3) and have a cavity (3).
1) A shaft pin (25b, 25) having a perfect circular cross-section protruding inward
c) is provided, and in the second step, the cavity (32) formed by the shaft pin (25b, 25c).
A method for manufacturing an outlet grill in which molten resin is injected or injected. In this case, in the first step, the wind direction deflecting plate is formed with a concave shaft portion at a portion corresponding to the shaft pin.
In the second step, the main body case is formed with a convex shaft portion that engages with the shaft portion of the wind direction deflecting plate. According to the above configuration, the rotation axis of the wind direction deflection plate is always a perfect circle, and a smooth rotation operation of the wind direction deflection plate can be obtained.

[0034]

According to the invention described in claim 1, the excellent effect that the smooth rotation operation of the wind direction deflecting plate can be realized at the connecting portion between the wind direction deflecting plate and the connecting member. .

According to the second aspect of the invention, it is possible to prevent the connecting member from falling off. According to the third aspect of the invention, the rotating operation of the wind direction deflecting plate can be further smoothed.

According to the fourth aspect of the invention, it is possible to improve workability and reduce manufacturing cost.

[Brief description of drawings]

FIG. 1 is a front view of an outlet grill according to an embodiment.

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

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a bottom view of the outlet grill.

FIG. 5 is a perspective view of a vertical blade as viewed from below.

FIG. 6 is a perspective view showing a connecting rod.

FIG. 7 is a cross-sectional view of a mold showing a manufacturing process of an outlet grill.

FIG. 8 is a perspective view showing a wind direction deflecting plate and a connecting member according to a conventional technique.

FIG. 9 is a cross-sectional view for explaining problems in the conventional technique.

[Explanation of symbols]

1 ... Outlet grille, 2 ... Barrel as body case, 3
... vertical blades as wind direction deflecting plates, 4 ... connecting rods as connecting members, 11 ... recesses, 14 ... disk parts as fitting portions, 15 ... central axis, 23 ... first slide core, 23a
... protrusion, 25 ... pin, 28 ... second slide core, 33
…cavity.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuji Ina 1 Ochiai, Nagachi, Kasuga-cho, Nishikasugai-gun, Aichi Toyota Gosei Co., Ltd. Within Toyoda Gosei Co., Ltd. (72) Inventor Shigeru Yabuya 1 No. 1 Nagahata Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture Within Toyoda Gosei Co., Ltd. Ceremony company Tani Die Mold (72) Inventor Hiroyasu Sahara 2511-9 Washizu, Kosai City, Shizuoka Prefecture Hamana Plastic Co., Ltd.

Claims (4)

[Claims] 1. A first step of injection-molding a plurality of wind direction deflection plates (3) in a parallel state with a first thermoplastic resin, and the plurality of wind direction deflection after resin solidification in the first step. A method for manufacturing an outlet grill, comprising a second step of injection-molding a connecting member (4) for integrally rotating the plate (3) with a second thermoplastic resin, the method comprising: In the step of (3), there is a protrusion (23a) having a circular cross-section that protrudes in a direction parallel to the rotation axis direction of the wind direction deflection plate (3), and it is parallel to the rotation axis direction of the wind direction deflection plate (3). The recess (11) of the wind direction deflecting plate (3) is molded using the slidable first slide core (23), and in the second step, the recess (11) and the second slide core (28) are formed. Cavity formed in (33)
A method for manufacturing an outlet grill, characterized in that the fitting portion (14) of the connecting member (4) is molded by filling molten resin into the. 2. The method for manufacturing an outlet grill according to claim 1, wherein the projection (23a) of the first slide core (23) has a tapered surface whose diameter increases toward the tip. 3. A shaft pin (25) having a perfect circular cross section at the shaft center of the protrusion (23a) of the first slide core (23).
The method for manufacturing an outlet grill according to claim 1, wherein a) is projected. 4. The connecting member (4) in the second step.
At the same time that the resin is molded, the plurality of wind direction deflection plates (3)
The method for manufacturing an outlet grill according to any one of claims 1 to 3, wherein the main body case (2) axially supporting the blades is formed by resin molding.