JP3704756B2 - Manufacturing method of blowout grill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an outlet grill made of a thermoplastic resin.
[0002]
[Prior art]
In this type of air outlet grille, a plurality of wind direction deflecting plates are pivotally supported by the main body case, and the plurality of wind direction deflecting plates are connected by a connecting member so as to be able to operate integrally. FIG. 8 shows the 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 includes a pair of upper and lower support shafts 42 formed on the same axis and a connection pin 43 extending in a direction parallel to the axial direction of the support shaft 42. Have. The head of the connecting pin 43 is formed in a spherical shape. The connecting pin 43 is inserted into a through hole 45 formed in the connecting rod 44 so that the wind direction deflecting plate 41 is connected so as to be able to operate integrally.
[0003]
Further, as a method for forming a series of wind direction deflecting plates as described above, for example, Japanese Patent Laid-Open No. 63-282450 is known. That is, according to the above publication, a cavity is formed using a split mold that is divided along the axial direction of the support shaft 42 or the connecting pin 43 of the wind direction deflecting plate 41, and a molten thermoplastic resin is injected into the cavity. The Then, after the molten resin has solidified, the movable part of the mold apparatus is replaced, and another thermoplastic resin is injected into the cavity of the mold apparatus, and the connecting rod 44 is formed so that a series of connecting pins 43 are connected. Is done. In addition, the method of resin-molding different members by two injection moldings as described in the above publication is generally called a two-color molding method.
[0004]
[Problems to be solved by the invention]
However, in the blowout 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 misalignment of the split mold on the mating surface (see FIG. 9). Thus, there is a problem that the smooth turning operation of the wind direction deflecting plate 41 cannot be obtained. In addition, burrs (extruding resin) on the split mold mating surfaces also hinder smooth rotation.
[0005]
The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a method for manufacturing a blowout grill capable of realizing a smooth turning operation of a wind direction deflecting plate. is there.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a first step of injection-molding a plurality of wind direction deflecting plates that are pivotally supported by the main body case and are in parallel with a first thermoplastic resin, A blowout grill having 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. In the first step, in the first step, the wind direction deflector plate has a shaft pin having a perfectly circular cross section that extends on the axis of the rotating shaft of the wind direction deflecting plate and protrudes into the blade cavity. A wind direction deflecting plate using a first slide core having a projecting portion having a circular cross section projecting in a direction parallel to the rotational axis direction of the deflecting plate and slidable in parallel to the rotational axis direction of the wind direction deflecting plate in the molding of the shaft hole and the recess, the second step, Serial recess and is filled with a molten resin into a rod cavity formed in the second slide core, and summarized in that for molding the engaging portion of the coupling member.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention, the projection of the first slide core has a tapered surface that increases in diameter as it approaches the tip.
According to a third aspect of the present invention, in the first or second aspect of the present invention, a shaft pin having a perfectly circular cross section projects from the axial center of the projecting portion of the first slide core.
[0008]
In the invention according to claim 4, in the invention according to any one of claims 1 to 3, in the second step, the connecting member is resin-molded, and at the same time, the plurality of wind direction deflecting plates are arranged in parallel. The body case to be supported is molded with resin.
[0009]
(Function)
According to the first aspect of the present invention, in the first step, the plurality of wind direction deflecting plates are injection-molded in a parallel state by the first thermoplastic resin. At this time, the wind direction deflector plate has a shaft pin having a perfectly circular cross section extending on the axis of the rotation axis of the wind direction deflecting plate and projecting into the blade cavity, and a direction parallel to the direction of the rotation axis of the wind direction deflector plate A shaft hole and a concave portion of the wind direction deflecting plate are formed using a first slide core that has a projecting portion having a circular cross section projecting in the direction and is slidable in parallel with the rotational axis direction of the wind direction deflecting plate. In addition, after the resin is solidified in the first step, in the second step, a connecting member for integrally rotating the plurality of wind direction deflecting plates is injection-molded with the second thermoplastic resin. At this time, molten resin is filled in the cavity for the rod formed by the concave portion of the wind direction deflecting plate and the second slide core, and the fitting portion of the connecting member is formed.
[0010]
That is, the concave portion of the wind direction deflecting plate formed by the first slide core is always formed in a perfect circle shape without causing deformation or burrs due to the displacement of the mold apparatus. Further, the fitting portion of the connecting member is also formed into a perfect circle, thereby realizing a smooth rotation operation of the wind direction deflecting plate.
[0011]
According to the second aspect of the present invention, the concave portion of the wind direction deflecting plate is formed in a reverse tapered shape in cross section, and the connecting member is further formed in the concave portion. In such a case, the connecting member is prevented from falling off by the opposing tapered surfaces of the concave portion of the wind direction deflecting plate and the fitting portion of the connecting member.
[0012]
According to the third aspect of the present invention, the hole corresponding to the shaft 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. Become. Thereby, the fitting part of the connecting member rotates around the center of the recess, and the rotating operation of the wind direction deflecting plate becomes smoother.
[0013]
According to the fourth aspect of the 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 a parallel state is resin-molded. In this case, the blowout grill is manufactured through a series of resin molding steps without requiring the assembling work of the respective members, so that the workability can be improved and the manufacturing cost can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, 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.
[0015]
1-4 is a whole block diagram of the blower outlet grill in this embodiment. 1 is a front view of the outlet grille, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. However, FIGS. 3 and 4 show a state where the wind direction is slightly changed. In each figure, the blower outlet grill 1 is disposed in the blower duct, and the wind sent from the air conditioner is from the rear (left side of FIG. 2) to the front (right side of FIG. 2). Blown out.
[0016]
The blower outlet grill 1 includes a barrel 2 for passing the wind from the air duct and a plurality (in this embodiment, five) of wind direction deflecting plates (hereinafter referred to as vertical blades) arranged in parallel on the rear side of the barrel 2. ) 3 and a connecting rod (connecting member) 4 for connecting the blades 3 so as to be integrally operable. The vertical blade 3 is molded from ABS (acrylonitrile styrene butadiene) as the first thermoplastic resin, and the barrel 2 and the connecting rod 4 are molded from PP (polypropylene) as the second thermoplastic resin. Yes.
[0017]
Hereinafter, the structure of each member 2-4 is explained in full detail. A plurality of wind direction deflecting plates (hereinafter referred to as horizontal blades) 5 extending in the horizontal direction are formed in the barrel 2, and a semicircular notch 5a is formed at the rear end of the horizontal blade 5 (FIG. 3). To show). Further, support shafts 6a and 6b for supporting the vertical blade 3 are formed on the inner surface of the barrel 2 so as to be symmetrical with respect to the vertical direction. The barrel 2 is supported so as to be pivotable in the vertical direction on both left and right support shafts (not shown).
[0018]
The configuration 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 7 a and 7 b are formed coaxially on 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 coaxially with the shaft holes 7a and 7b are formed at four locations on the upper and lower sides. The step portion 8 has a full cross section so that it can shrink evenly during resin molding. An operating lever 9 that projects forward of the barrel 2 is integrally formed with the vertical blade 3 located at the center. In the vicinity of the shaft hole 7b, a recess 10 extending rearward from the blade front end is formed.
[0019]
On the rear side of the shaft hole 7 b, a concave portion 11 having a circular planar shape and having a tapered surface whose diameter is increased toward the bottom is formed, and a small diameter hole 12 is formed in the center of the concave portion 11. In the present 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.
[0020]
Next, the configuration of the connecting rod 4 will be described with reference to FIGS. The connecting rod 4 has a long plate-like rod portion 13 and a disc portion (fitting portion) 14 formed at the same interval as the support shafts 6 a and 6 b of the barrel 2. A central shaft 15 is formed on the inner surface. 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 is increased toward the central axis 15.
[0021]
And in the blower outlet grill 1 comprised as mentioned above, the vertical blade 3 can rotate with respect to the barrel 2 by engagement with the spindles 6a and 6b of the barrel 2 and the shaft holes 7a and 7b of the vertical blade 3. It is supported by. In such a case, the disk portion 14 of the connecting rod 4 is fitted into the recess 11 of the vertical blade 3, so that a series of the vertical blades 3 group can simultaneously use the shaft holes 7a and 7b as rotation centers (rotation shafts). Operate.
[0022]
On the other hand, the air outlet grill 1 is manufactured by a two-color molding method using a synthetic resin, and the manufacturing process of the air outlet grill 1 will be described below with reference to FIGS. 7 (a) and 7 (b).
[0023]
7A, the blade cavity 31 includes a fixed mold 21, a movable mold 22 movable in the vertical direction in the figure, and left and right first slide cores 23 movable in the horizontal direction in the figure. 24. The first slide core 23 located on the left in the figure is formed with a substantially cylindrical protrusion 23a that protrudes in a direction parallel to the axial direction of the vertical blade 3 (the extending direction of the support shafts 6a and 6b). ing. The first slide cores 23 and 24 are embedded with pins (shaft pins) 25 a and 25 b processed into a perfect circle in cross section, and their tips protrude into the blade cavity 31. In this case, one pin 25a protrudes from the center position of the protrusion 23a.
[0024]
In addition, a pin 25c having a perfectly 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 tip of the pin 25c is a blade. It protrudes into the cavity 31 for use. The movable mold 22 is provided with a gate portion 26 communicating with the blade cavity 31. The gate portion 26 opens at the position of the step portion 8 of the vertical blade 3, but the opening width is shorter than the width of the step portion 8. Thereby, the protrusion of the resin at both end faces of the step portion 8 is prevented.
[0025]
Then, molten resin (ABS) is injected into the blade cavity 31 through the gate portion 26. Thereafter, when the vertical blade 3 is solidified in the cavity 31, the movable mold 22 first moves downward, and then the left and right first slide cores 23, 24 move to the left and right sides. At this time, the vicinity of the recess 10 of the vertical blade 3 is somewhat bent and deformed, so that the protrusion 23a of the first slide core 23 is removed from the recess 11 of the vertical blade 3, and the edge near the recess 11 is lost. There is no.
[0026]
After forming the vertical blade 3, as shown in FIG. 7B, the barrel cavity 32 and the rod cavity 33 are formed by the fixed mold 21, the movable mold 27, and the left and right second slide cores 28 and 29. It is formed. Then, 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 formed by solidification of the resin. Note that the melting temperature of ABS injected earlier is 210 ° C., and the melting temperature of PP injected later is 170 ° C. Then, when each metal mold | die is removed, the blower outlet grill 1 shown in the said FIGS. 1-4 is obtained.
[0027]
In the blower outlet grill 1 of the present embodiment configured as described above, the following effects are obtained. That is, in the present embodiment, as a first step, a plurality of vertical blades 3 are resin-molded in a parallel state. At this time, a circular recess 11 extending in a direction parallel to the axial direction of the vertical blade 3 is formed using the first slide core 23, and the pins 25 a to 25 c of the first slide cores 23 and 24 are further formed. The small-diameter hole 12 and the shaft holes 7a and 7b of the concave portion 11 were formed by using this. And as a 2nd process after shaping | molding of the vertical blade 3, the metal mold | die was replaced | exchanged and the barrel 2 and the connecting rod 4 were resin-molded. At this time, the disk portion 14 (and the central shaft 15) of the connecting rod 4 was formed in the recess 11, and the support shafts 6a and 6b of the barrel 2 were formed in the shaft holes 7a and 7b.
[0028]
In short, since the axis of the wind direction deflecting plate (support shaft 42 and connecting pin 43 in FIG. 8) is conventionally formed by the split mold, the positional deviation and burrs of the mold device on the mating surface of the split mold are Although this has hindered a smooth rotation operation, according to the configuration of the present embodiment, this problem can be solved. In other words, the shaft holes 7a and 7b and the recess 11 of the vertical blade 3 formed by the first slide cores 23 and 24 are free from defects due to misalignment or burrs of the mold apparatus, and these shafts are not affected. The holes 7a and 7b and the recess 11 are always formed into a perfect circle. In such a case, the support shafts 6a and 6b of the barrel 2 formed with the shaft holes 7a and 7b and the concave portion 11 as cavities and the disk portion 14 of the connecting rod 4 are also formed into a perfect circle. As a result, the contact surface of each member slides smoothly, and the smooth rotation operation of the vertical blade 3 can be realized.
[0029]
In addition, the diameter of the protrusion 23a of the first slide core 23 was increased toward the tip, and the recess 11 of the vertical blade 3 was formed into a tapered cross section by the slide core 23. In this case, the connecting rod can be prevented from coming off by the tapered surfaces of the concave portion 11 of the vertical blade 3 and the disk portion 14 of the connecting rod 4 that face each other.
[0030]
In addition, since the barrel 2 and the connecting rod 4 are molded simultaneously with resin, it is not necessary to individually assemble each member, and it is possible to improve workability and reduce manufacturing costs.
[0031]
In addition to the above-described embodiment, the present invention can also be embodied as follows.
(1) In the above embodiment, 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 first slide cores 23 and 24. Instead of these pins 25a to 25c, shaft pins may be formed integrally with the first slide core 23. Further, the shaft pin can be omitted from the protrusion 23a of the first slide core 23.
[0032]
(2) In the above 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. However, 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. You may make it shape | mold.
[0033]
The technical idea which is not described in each claim of the claims and is grasped from the above embodiment will be described below together with the effects thereof.
In the blower grill manufacturing method according to claim 4, 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 are formed in the cavity (31). ) Are provided with shaft pins (25b, 25c) having a perfectly circular cross section, and in the second step, molten resin is introduced into the cavities (32) formed by the shaft pins (25b, 25c). A method of manufacturing an outlet grill to be injected or injected. In this case, in the first step, the wind direction deflector 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 rotational axis of the wind direction deflecting plate is always a perfect circle, and a smooth rotational operation of the wind direction deflecting plate is obtained.
[0034]
【The invention's effect】
According to the first aspect of the present invention, an excellent effect that a 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 is exhibited.
[0035]
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 present invention, the turning operation of the wind direction deflecting plate can be further smoothed.
[0036]
According to the fourth aspect of the present invention, it is possible to improve workability and reduce manufacturing costs.
[Brief description of the drawings]
FIG. 1 is a front view of an outlet grill according to an embodiment.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
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 in the prior art.
FIG. 9 is a cross-sectional view for explaining problems in the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Air outlet grill, 2 ... Barrel as main body case, 3 ... Vertical blade as wind direction deflecting plate, 4 ... Connecting rod as connecting member, 11 ... Recessed part, 14 ... Disc part as fitting part, 15 ... Central axis, 23 ... first slide core, 23a ... projection, 25 ... pin, 28 ... second slide core, 33 ... cavity.

Claims (4)

A first step of injection-molding a plurality of wind direction deflecting plates (3) pivotally supported by the main body case (2) with a first thermoplastic resin;
A second step of injection-molding the connecting member (4) for integrally rotating the plurality of wind direction deflecting plates (3) with the second thermoplastic resin after the resin is solidified in the first step. A method of manufacturing a blowout grill having
In the first step, the wind direction deflector plate (3) has an axial pin (25b) having a perfectly circular cross section that extends on the axis of the rotation shaft of the wind direction deflecting plate (3) and protrudes into the blade cavity (31). It has a projecting part (23a) having a circular cross section projecting in a direction parallel to the rotational axis direction of the wind direction deflecting plate (3) and is slidable parallel to the rotational axis direction of the wind direction deflecting plate (3). Using the first slide core (23), the shaft hole (7b) and the recess (11) of the wind direction deflecting plate (3) are formed,
In the second step, the cavity for the rod (33) formed by the concave portion (11) and the second slide core (28) is filled with molten resin, and the fitting portion of the connecting member (4) (14) The shaping | molding method of the blower outlet grille characterized by the above-mentioned. The protrusion (23a) of a said 1st slide core (23) is a manufacturing method of the blower outlet grill of Claim 1 which has a taper surface which diameter-expands as it approaches a front-end | tip. The method for manufacturing a blowout grill according to claim 1 or 2, wherein a shaft pin (25a) having a perfectly circular cross section protrudes from the axial center of the protrusion (23a) of the first slide core (23). The said 2nd process WHEREIN: The main body case (2) which pivotally supports the said several wind direction deflecting plate (3) in a parallel state is resin-molded simultaneously with resin-molding the said connection member (4). The manufacturing method of the blower outlet grill in any one.

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