JPH0752194A - Resin product and method for molding it - Google Patents

Abstract

PURPOSE:To prevent generation of a sink mark in a molding process on an opposite side face of a main body caused by molding of other member, in a resin product whose main body and the other member are integrally molded with different resin materials. CONSTITUTION:A split piece 1 as a resin product is molded integrally with a louver main body 2, a slender louver edge 3 molded integrally along the upper edge of the main body 2, and a plurality of band-like buffer sections 4 which are continuously branched from the louver edge 3 on the rear face side of the louver main body 2. Throttle sections 10 are formed between the louver edge 3 and each buffer section 4. Further, the louver main body 2, the louver edge 3, the throttle sections 10 and the buffer sections 4 are molded with different resin materials. Accordingly, as a cavity for molding the buffer sections 4 is filled with the resin material through a passage for molding the throttle sections 10, the pressure of the resin material to be filled for molding the buffer sections 4 is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin product obtained by integrally molding a plate-shaped main body and its associated parts with different resin materials, and a molding method thereof.

[0002]

2. Description of the Related Art Conventionally, for integrally molding different resin materials using a mold device, for example, Japanese Patent Publication No. 63-4404.
The technique disclosed in Japanese Patent No. 6 can be adopted. In the technique of this publication, the slide core is provided on one of the two molds to be clamped. Then, different resin materials are injected into the cavity formed between the two molds and the slide core by mold clamping before and after the slide core is moved, whereby one resin product is integrally molded.

Here, it is conceivable to manufacture the cowl louver top for automobiles as a resin product by adopting the above technique. That is, FIG. 15 shows the cowl louver top 4
1 is a part of a sectional view obtained by cutting 1 in the width direction. The cowl louver top 41 is a plate-shaped louver body 4
2 and a louver edge portion 43 integrally formed with the louver body portion 42. Here, the louver main body portion 42 is formed of a hard resin material, and the louver edge portion 43 is joined to the windshield, and thus is formed of a soft resin material. That is, in the cowl louver top 41, the louver main body portion 42 and the louver edge portion 43 are integrally formed of different resin materials. In such a cowl louver top 41, it is conceivable to provide a cushioning material on the back surface side of the louver body portion 42 for cushioning with the body. It is conceivable to integrally form a buffer portion 44 made of the same resin material as that of the louver edge portion 43 with the louver body portion 42, as shown in FIG. This buffer portion 44 is the louver body portion 4
The back side of 2 is formed into a band shape. Such a cushioning section 44 is preferable in manufacturing because it can save the labor of retrofitting the cushioning material.

[0004]

However, in the cowl louver top 41 having the cushioning portion 44 integrally formed therein, after the louver body portion 42 having a plate shape is formed, the louver edge portion 43 and the cushioning portion 44 are attached to the louver body. The part 42 is integrally formed. At that time, as shown by the chain double-dashed line in FIG.
There was a possibility that a so-called sink mark H might occur on the design surface side of the louver body portion 42 corresponding to the position of No. 4. This is because after molding the louver main body 42, a part of the louver main body 42 is pulled toward the buffer 44 by the pressure when filling the cavity for molding the buffer 44 with the soft resin material. It is presumed that this is due to that. Therefore, when a sink mark H is generated on the design surface side of the louver body portion 42, the appearance of the louver body portion 42 is impaired, which may impair the merchantability of the cowl louver top 41.

The present invention has been made in view of the above-mentioned circumstances, and is premised on a resin product in which another member is integrally formed on one side surface of a plate-shaped main body with different resin materials. Then, an object of the invention is to provide a resin product and a molding method thereof capable of preventing generation of a sink mark on the opposite side surface of the main body due to the molding of another member. It is in.

[0006]

In order to achieve the above object, in a first aspect of the present invention according to claim 1, a plate-shaped main body formed of a first resin material, and a first In a resin product having an auxiliary part integrally formed with the main body by a second resin material different from the resin material, the auxiliary product is continuously branched from the auxiliary part and is integrally formed on one side surface of the main body with the second resin material. It is intended to include a branched portion formed in the above and a narrowed portion formed between the auxiliary portion and the branched portion.

In order to achieve the above object, in the second invention according to claim 2, a slide core is provided in one of the two molds, and the two molds and the slide are closed by mold clamping. For the cavity formed between the core and
In the molding method in which different resin materials are injected from the runner before and after moving the slide core to integrally mold one resin product, two molds are clamped and the first mold is placed between the mold and the slide core. First step of forming the first cavity, second step of molding the plate-shaped main body by injecting the first resin material into the first cavity from the runner, and moving the slide core And a third step of molding a second cavity between the two dies, the slide core and the main body, and a second resin material for the second cavity is passed from the runner to the second cavity. It is intended to include a fourth step of molding the second resin material integrally with the main body by squeezing and injecting the flow path at the portion.

[0008]

According to the structure of the first invention, when the resin product is molded using the mold, the first resin material is injected into the cavity formed in the mold, so that The body is molded. Then, by injecting the second resin material into another cavity formed adjacent to the body portion, the accessory portion is integrally molded with the body portion. At this time,
A second resin material filled in another cavity forms a narrowed portion and a branched portion that are continuously branched from the auxiliary portion.

Therefore, since the other cavity for molding the branch portion is filled with the resin material through the flow path for molding the narrowed portion, the resin material filled for molding the branch portion is filled with the resin material. The pressure is reduced.

According to the structure of the second invention, the first cavity is formed between the two molds and the slide core by mold clamping, and the first resin material is injected into the first cavity. Thus, the plate-shaped main body is molded. or,
After the main body is molded, the slide core is moved to form a second cavity between the two molds, the slide core, and the main body. Then, by injecting the second resin material into the second cavity from the runner at a portion communicating with the second cavity, a separate member is integrally molded with the main body.

Therefore, the second cavity is filled with the second resin material injected through the narrowed flow path, so that the filling pressure of the resin material is reduced.

[0012]

【Example】

(First Embodiment) A first embodiment in which the resin product and the molding method thereof according to the first and second inventions are embodied in a cowl louver top for automobiles will be described in detail below with reference to FIGS. 1 to 9. .

FIG. 1 is a plan view of a split piece 1 of a cowl louver top, which is a resin product manufactured in this embodiment, and shows a state immediately after molding by a mold.
That is, in this embodiment, the cowl louver top is composed of two left and right symmetrical split pieces 1 (only one of which is shown in FIG. 1), and the split pieces 1 are connected to each other. The cowl louver top composed of the two divided pieces 1 is arranged so as to be interposed between the lower edge of the windshield of the automobile and the body. The divided piece 1 includes a louver main body 2 having a horizontally long plate shape, and an elongated louver edge 3 as an auxiliary portion integrally formed along the upper edge of the main body 2.
It has and. Further, on the back surface side of the louver body portion 2, two belt-shaped buffer portions 4 are formed integrally with the louver body portion 2 as branch portions which are continuously branched from the louver edge portion 3. In FIG. 1, a large number of ventilation holes 5 are vertically and horizontally formed on the left side in the longitudinal direction of the louver body portion 2.
Nets are arranged in the. Further, on the right side in the longitudinal direction of the louver body portion 2, another buffer portion 6 which is continuously branched from the louver edge portion 3 and is made of the same resin material as that of the louver edge portion 3 is provided. The split piece 1 is supported by the body by the buffer portion 6. Further, on the right side of the louver body 2 in the longitudinal direction, another two belt-shaped buffer portions 7 made of the same resin material as the louver edge portion 3 and having the same function as the buffer portion 4 are provided. There is. Incidentally, FIG.
In addition, what is attached to the lower side of the louver body 2 is
The molded piece 8 of the runner and the gate, which is produced when the main body 2 is molded, is cut before being commercialized. Also, attached to one end of the louver edge portion 3 and each buffer portion 7 is a molded piece 9 of the runner and gate, which is also produced at the time of molding, and is cut before commercialization.

FIG. 2 is a plan view showing a part of the back surface side of the louver body 2 and the buffer portion 4 there. As is clear from the figure, the narrowed portion 10 is formed between the louver edge portion 3 and the buffer portion 4. That is, the louver edge 3 and the buffer 4
The narrowed portion 10 is narrow in the width direction. Here, the width of the buffer portion 4 is set to “w1”, and the diaphragm portion 10
If the width is “w2”, in this embodiment, “w2 / w”
"1" is set to "50%" or less.

FIG. 3 is a sectional view taken along the line AA of FIG. In the figure, the upper side is the design surface of the split piece 1.
Further, in the figure, the right end of the divided piece 1 is a louver edge portion 3 integrally formed with the louver body portion 2. The windshield 11 is fitted on the back side of the louver edge portion 3. Further, in the figure, a buffer portion 4 continuously extending from the louver edge portion 3 is formed on the back surface side of the louver body portion 2. In addition, the narrowed portion 10 is between the buffer portion 4 and the louver edge portion 3. In this embodiment, the narrowed portion 10 is formed narrow even in the thickness direction thereof. In this embodiment, when the thickness of the buffer portion 4 is "d1" and the thickness of the throttle portion 10 is "d2", "d2 / d1" is set to "2/3" or less. . With this configuration, the narrowed portion 10 has the buffer portion 4 in both the width direction and the thickness direction.
Is narrower than the width.

The louver body 2, the louver edge 3 and the buffers 4, 6 and 7 are made of different resin materials. That is, the louver body 2 is made of a relatively hard first resin material 12 such as polypropylene (f-PP). On the other hand, since the louver edge 3 is bonded to the windshield 11, it is made of a relatively soft second resin material 13 such as styrene-ethylene-butylene-styrene copolymer (SEBE). Therefore,
The buffer portion 4 is made of the same second resin material 13 as the louver edge portion 3, and the other buffer portions 6, 7 are also made of the same second resin material 13 as the louver edge portion 3.

In the divided piece 1 thus constructed,
The buffer portions 4 and 7 formed on the back side of the louver body 2
Since is molded from the soft second resin material 13, it functions as a cushioning material when the cowl louver top is mounted on the body.

Next, a mold apparatus for manufacturing the above-mentioned cowl louver top divided piece 1 will be described.
FIG. 4 is a cross-sectional view showing a part of the mold device, and shows a portion corresponding to the line AA in FIG. This mold device includes a first mold 14 on the lower side and a second mold 15 on the upper side, and the molds 14 and 15 are clamped and opened with respect to each other. The first mold 14 is provided with a first slide core 16, a second slide core 17, and a third slide core 18, which are vertically movable, adjacent to each other.

The first slide core 16 includes two molds 14,
It is for dividing the cavity formed between 15 into two with time. That is, as shown by the solid line in FIG. 4, both molds 14 and 15 are clamped, and the first slide core 16
The front end surface 16a of the
In a state where the tip surface 17a of the second slide core 17 and the tip surface 18a of the third slide core 18 are arranged flush with the die surface of the first mold 14, the louver body 2 of the split piece 1 is placed.
Forming a first cavity 19 for molding.
In addition, the second mold 15 has the first cavity 19 with the first
The runner and the gate for injecting the resin material 12 are formed. On the other hand, as shown by the chain double-dashed line in FIG. 4, the first slide core 16 and the second slide core 1
A second cavity 20 for molding the louver edge portion 3, the buffer portion 4, and the narrowed portion 10 is formed adjacent to the first cavity 19 in a state where the seventh and third slide cores 18 are moved backward. It In the second cavity 20, the resin material flow path for molding the louver edge portion 3 is relatively narrow and long. Further, the above-mentioned runner and gate for injecting the second resin material 13 into the second cavity 20 are formed in the second mold 15.

FIG. 8 is a sectional view showing a part of the mold apparatus, showing a part corresponding to the line BB in FIG.
As shown in FIG. 8, when the two molds 14 and 15 are clamped, the above-described second cavity 20 for molding the louver edge body portion 3 of the split piece 1 is formed. Also, the second
Adjacent to the cavity 20 of the
The above-described runner 21 having a trapezoidal cross section for injecting the resin material 13 is formed. And that runner 21
A diaphragm 22 is formed in a portion communicating with the second cavity 20. That is, the diaphragm 22 forms a part of the runner 21, but the inner diameter of the portion of the diaphragm 22 is set smaller than that of the other portions.

FIG. 9 is a sectional view showing a part of the mold apparatus, and shows a portion corresponding to the line CC of FIG.
In this portion, a fourth slide core 23 for molding the buffer portion 7 is provided so as to be vertically movable. Then, as shown in FIG. 9, when the molds 14 and 15 are clamped, the above-described first cavity 19 for molding the louver body 2 of the split piece 1 is formed. In addition, after the louver body 2 is molded, in the state where the tip end surface 23a of the fourth slide core 23 is moved backward as shown by the chain double-dashed line in FIG. A cavity 24 is formed in communication with the runner 21. Further, the diaphragm 25 is also formed in a portion of the runner 21 which communicates with the cavity 24. That is, the diaphragm 25 forms a part of the runner 21, but the inner diameter of the portion of the diaphragm 25 is set smaller than that of the other portions. Here, if the inner diameter of the diaphragm 22 is "a" and the inner diameter of the diaphragm 24 is "b", the setting is such that "a>b".

Next, a method of manufacturing the divided piece 1 which is performed by using the above-mentioned mold device will be described. Split piece 1
For molding, in the first step, as shown by the solid line in FIG. 4, the first mold 14 and the second mold 15 are clamped. Further, in this state, the tip surface 16a has the second mold 15
The first slide core 16 is arranged so as to abut.
Further, the second slide core 17 and the third slide core 18 are arranged so that the front end surface 17a and the front end surface 18a are flush with the mold surface of the first mold 14. Further, as shown by the solid line in FIG. 9, the tip surface 23a of the fourth slide core 23 is arranged so as to be flush with the mold surface of the first mold 14. By this process, both molds 14 and 15 and each slide core 16 to
A first cavity 19 for molding the louver body 2 is formed between the first cavity 19 and the cavities 18.

Then, in the second step, as shown in FIG. 5, the first resin material 12 is injected into the first cavity 19 through the gate and the runner. By this process,
The plate-shaped louver body 2 is molded. Also, as shown in FIG. 9, the louver body 2 is molded.

Then, in the third step, as shown in FIG. 6, the first and second slide cores 16 and 17 are moved backward so that both tip surfaces 16a and 17a are flush with each other. To do. Further, the third slide core 18 is moved backward so that the tip end surface 18a thereof has the tip end surfaces 16a and 17a.
Place it so that it is lower than. Through this process, the louver body 2, the molds 14 and 15, and the slide cores 16 are formed.
Second for obtaining the louver edge 3 and the buffer 4 between ~ 18
Cavity 20 is formed. Further, in this step, another cavidi 24 for obtaining the buffer portion 7 is formed as shown in FIG.

Then, in the fourth step, as shown in FIG. 7, the second resin material 13 is injected into the second cavity 20 through the gate and the runner 21. By this step, the louver edge portion 3 is joined to the louver body portion 2 and integrally molded. At the same time, the buffer portions 4 are joined to the back surface side of the plate-shaped louver body portion 2 and integrally molded.
In addition, in this step, another cavity 24 shown in FIG.
Is filled with the second resin material 13, and each buffer portion 7 is joined to the back surface side of the louver body portion 2 and integrally molded.

Then, in the final fifth step, after the molded product is cooled and solidified from the above state, both molds 14, 1 are formed.
5 is opened and the molded product is taken out. By this step, as shown in FIG. 1, the louver body 2, the louver edge 3, and the buffers 4, 6, 7 are integrally molded, and the molded pieces 8, 9 are formed.
A segmented piece 1 with is attached. Then, after cutting the molded pieces 8 and 9 and connecting the left and right divided pieces 1, one cowl louver top is obtained.

As described above, according to the split piece 1 of the cowl louver top in this embodiment, the louver edge portion 3 integrally formed with the louver body portion 2 to the respective cushioning portions 4, 6 are formed.
Are continuously branched, and the buffer portions 4 and 6 are integrally formed with the louver body portion 2 by the same second resin material 13 as the louver edge portion 3. Further, the other buffer portion 7 is formed integrally with the louver body portion 2 by the same second resin material 13 as the louver edge portion 3.

That is, when the divided piece 1 is molded by the two molds 14 and 15, the first resin material 12 is injected into the first cavity 19 formed in the two molds 14 and 15, so that the hard resin is hardened. The louver body 2 is molded. Then, by injecting the second resin material 13 into the second cavity 20 formed adjacent to the louver body portion 2, the soft louver edge portion 3 is integrally joined to the louver body portion 2 and molded. To be done. At this time, the buffer portions 4 and 6 continuously branched from the louver edge portion 3 are integrally joined and molded to the louver body portion 2 by the second resin material 13 injected into the second cavity 20. It Further, the other buffer portion 7 is integrally joined to the louver body portion 2 by the second resin material 13 directly injected from the runner 21 to be molded.

Therefore, at the time of molding the louver edge portion 3, the filling speed and pressure of the second resin material 13 flowing through the second cavity 20 are dispersed for molding the buffer portions 4, 6, 7. The filling rate and pressure will not be unnecessarily high. That is, even if the flow path for molding the louver edge portion 3 in the second cavity 20 is relatively narrow and long as in this embodiment, the filling of the second resin material 13 flowing in the second cavity 20 is prevented. Speed and pressure are moderately moderated. As a result, the second resin material 13 becomes
Into the gap between the mating surfaces of the first mold 14 and the first mold 14.
It is possible to suppress the occurrence of burrs at the louver edge portion 3 without intruding into the gap with the slide core 16. Therefore, it is possible to omit the step for removing burrs on the louver edge 3.

In addition, in this embodiment, the second resin material 13 is filled in the cavity for molding each buffer portion 4 through the flow path for molding the narrowed portion 10, so that each buffer portion is formed. The pressure of the second resin material 13 filled for molding No. 4 is reduced. As a result, it is possible to prevent the occurrence of a sink mark on the design surface side of the louver body 2 having a plate shape due to the molding of the buffer portion 4. That is, when the soft second resin material 13 is injected into the second cavity 20 to mold the louver edge portion 3 and each buffer portion 4 after molding the louver main body portion 2, the louver is caused by the pressure. There is a risk that a part of the main body portion 2 will be pulled toward the buffer portion 4 side, and "sink" will occur on the design surface side of the louver main body portion 2. However, in this embodiment, by providing the narrowed portion 10 as described above, a "sink" in molding is obtained.
Can be prevented. Therefore, the appearance of the design surface side of the louver body 2 is not impaired, and the commerciality of the cowl louver top is not impaired.

In addition, in this embodiment, as shown in FIG. 8, a diaphragm 22 is formed between the runner 21 and the second cavity 20 for molding the louver edge portion 3 and the buffer portions 4, 6. To be done. Therefore, the second cavity 20 is filled with the second resin material 13 through the diaphragm 22, and the second resin material 13 with respect to the second cavity 20 is filled.
The filling pressure itself is reduced. From that meaning, it is possible to suppress the occurrence of burrs at the louver edge portion 3 and further to prevent the occurrence of a sink mark on the design surface side of the louver main body portion 2 due to the molding of each buffer portion 4. It can be effectively suppressed.

In addition, in this embodiment, as shown in FIG. 9, another cavity 24 for molding another buffer portion 7 is formed.
A diaphragm 25 is formed between the runner 21 and the runner 21. Therefore, the cavity 24 is filled with the second resin material 13 through the throttle 25, and the filling pressure of the resin material 13 is reduced. As a result, similarly to the case of molding the buffer portion 4 described above, it is possible to prevent the occurrence of a sink mark on the design surface side of the louver body portion 2 due to the molding of the other buffer portion 7. be able to.

In the above manufacturing method, when the different resin materials 12 and 13 are integrally molded, both molds 14 and 1 are molded.
The slide cores 16 to 18 are simply moved after the mold 5 is clamped once. Therefore, unlike the case where two molds are exchanged and used to integrally mold different resin materials, the mold apparatus as a whole can be downsized, and the molding cycle for obtaining the divided piece 1 can be reduced. Can be shortened.

Further, since the buffer pieces 4 and 7 are formed integrally with the louver body 2 in the divided piece 1 of this embodiment and they function as a cushioning material, a special cushioning material is used. There is no need to paste it on the back side of. Therefore, it is possible to omit the work of attaching the special cushioning material later.

(Second Embodiment) Next, a second embodiment embodying the resin product of the first invention will be described with reference to FIGS.
Follow the instructions below. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Particularly, different points will be mainly described.

FIG. 10 is a sectional view showing a part of the divided piece 31 according to FIG. 3 in the first embodiment, in which the upper side is the design surface. In the figure, the divided piece 31 includes a louver body portion 32 having a plate shape, and a louver edge portion 33 as an accessory portion is integrally formed at the right end thereof. In the same figure, what is molded on the back surface side of the louver body portion 32 is a buffer portion 34 as a branch portion that continuously extends from the louver edge portion 33. A thin portion 32a, which is thinner than other portions, is formed on the tip end side of the louver body portion 32.
The thickness of the thin portion 32a is about half that of other portions of the louver body 32. Two step portions 35 are formed between the louver edge portion 33 and the buffer portion 34 so as to correspond to the lower side of the thin portion 32 a, and a thin throttle portion 36 is formed corresponding to each of the step portions 35. Has been done. In this embodiment, the louver edge portion 33 and the buffer portion 34 are provided with respective step portions 35.
It has the same thickness except for. Since the thickness of each step portion 35 is smaller than that of the other portions, each throttle portion 3
6 is formed. In this embodiment, the thickness of the throttle portion 36 is set to be about half the thickness of the buffer portion 34. With this configuration, each narrowed portion 36 is formed narrower than the cushioning portion 34 in the thickness direction thereof.

In this embodiment, as in the first embodiment, the louver body 32 is made of the relatively hard first resin material 12, and the louver edge 33 and the buffer 34 are relatively soft second. It is made of a resin material 13. In this embodiment as well, the cushioning portion 34 functions as a cushioning material when the cowl louver top made of the divided pieces 31 is mounted on the body.

Next, a mold apparatus for manufacturing the above-mentioned divided piece 31 will be described. FIG. 11 is a sectional view showing a part of the mold device. This mold device includes an upper and lower first mold 14 and a second mold 15, and the first mold 14 has an integral slide core 37 that is vertically movable.
Is provided.

This slide core 37 is composed of both molds 14, 1.
It is intended to divide the cavity formed between the two into two over time, and the upper end side thereof is formed in a multi-stage shape. That is, as shown by the solid line in FIG.
In a state in which 15 is clamped and the tip end surface 37a of the slide core 37 is arranged in contact with the second mold 15, the first cavity 38 for molding the louver main body 32 including the thin portion 32a is formed. It is formed. The second mold 15 is also provided with a runner and a gate (not shown) for injecting the first resin material 12 into the first cavity 38. On the other hand, as shown by the chain double-dashed line in FIG. 11, when the slide core 37 is moved backward, the second cavity 39 for molding the louver edge portion 33, the buffer portion 34, and the narrowed portion 36 has the first cavity 39. Formed adjacent to the cavity 38. Further, the second mold 15 is provided with a runner and a gate (not shown) for injecting the second resin material 13 into the second cavity 39.

Next, a method of manufacturing the divided piece 31 which is performed by using the above-described mold device will be described. In order to mold the divided piece 31, in the first step, as shown by the solid line in FIG. 11, the first mold 14 and the second mold 15 are clamped. Further, in this state, the slide core 37 is arranged so that the front end surface 37 a contacts the second mold 15.
By this process, both molds 14 and 15 and the slide core 37 are
A first cavity 38 for molding the louver body portion 32 including the thin portion 32a is formed between and.

Subsequently, in the second step, as shown in FIG. 12, the first resin material 12 is injected into the first cavity 38 through the gate and the runner. Through this step, the plate-shaped louver main body 32 is molded, and the thin portion 32a is formed on the tip side thereof.

Then, in the third step, as shown in FIG. 13, the slide core 37 is moved backward and arranged so that its tip surface 37a is flush with the mold surface of the first mold 14. . By this step, the louver edge portion 3 is provided between the louver body portion 32, the molds 14 and 15, and the slide core 37.
3, the second cavity 39 for obtaining the buffer portion 34 and the throttle portion 36 is formed.

Then, in the fourth step, as shown in FIG. 14, the second resin material 13 is injected into the second cavity 39 through the gate and the runner. By this step, the louver edge portion 33 is joined to the louver body portion 32 and integrally molded. At the same time, the buffer portion 34 is joined to the back surface side of the plate-shaped louver body portion 32 and integrally molded. Further, between the louver edge portion 33 and the louver main body portion 32, two narrowed portions 36 are formed together with the two step portions 35 corresponding to the thin portion 32a.

Then, in the final fifth step, after the molded product is cooled and solidified from the above state, both molds 14, 1 are
5 is opened and the molded product is taken out. By this step, as shown in FIG. 10, the louver body portion 32 and the louver edge portion 33 are formed.
The divided piece 31 in which the cushioning portion 34 and the cushioning portion 34 are integrally formed is obtained. Then, one cowl louver top is obtained by connecting the left and right divided pieces 31.

As described above, in this embodiment, when the divided piece 31 is molded, the first resin material 12 is injected into the first cavity 38 formed in both molds 14 and 15, The hard louver body 32 is molded. Then, the second formed adjacent to the louver body 32
By injecting the second resin material 13 into the cavity 39, the soft louver edge portion 33 is integrally joined to the louver body portion 32 to be molded. At this time, the buffer portion 34 continuously branched from the louver edge portion 33 is integrally joined to the louver body portion 32 and molded by the second resin material 13 injected into the second cavity 39.

Therefore, when the louver edge 33 is formed, the second
The filling speed and pressure of the second resin material 13 flowing in the cavity 39 of the
The filling rate and pressure will not be unnecessarily high. That is, in this embodiment, the second cavity 39
Even if the flow path for molding the louver edge portion 33 is relatively narrow and long, the filling speed and pressure of the second resin material 13 flowing through the second cavity 39 are moderately moderated. As a result, the second resin material 13 does not enter the gap between the mating surfaces of the two molds 14 and 15 or the gap between the first mold 14 and the slide core 37, and the louver edge is prevented. The occurrence of burrs in the portion 33 can be suppressed. Therefore, it is possible to omit the step for removing burrs at the louver edge 33.

Moreover, in this embodiment, since the cavity for molding the buffer portion 34 is filled with the second resin material 13 through the flow path for molding each throttle portion 36, the buffer portion 34 is formed. The pressure of the second resin material 13 filled for molding is reduced. As a result, the buffer 34
It is possible to prevent the occurrence of a sink mark on the design surface side of the plate-shaped louver main body portion 32 due to the molding. That is, after molding the louver body 32,
When the second resin material 13 is injected into the second cavity 39 to mold the louver edge portion 33 and the buffer portion 34, part of the louver body portion 32 is pulled toward the buffer portion 34 due to the pressure. "Sink" on the design surface side of the louver body 32.
May occur. However, in this embodiment, by providing each of the throttle portions 36 as described above, it is possible to prevent the occurrence of "sink" in the molding. for that reason,
The appearance of the design surface side of the louver main body 32 is not impaired, and the commerciality of the cowl louver top is not impaired.

The present invention is not limited to the above-described embodiments, but may be implemented as follows with a part of the configuration appropriately modified without departing from the spirit of the invention. (1) In the first embodiment, the narrowed portion 10 is formed to be narrower than the buffer portion 4 in both the width direction and the thickness direction, but the narrowed portion in which the width direction or the thickness direction is narrower than the buffer portion is used. You may form.

(2) In each of the embodiments described above, the belt-shaped buffer portions 4, 34 and the like are provided as the branch portions, but the belt-shaped buffer portions are limited as long as they are continuously branched from the auxiliary portion. Not a thing.

(3) In each of the above-mentioned embodiments, as the resin materials different from each other, the hard first resin material 12 and the soft second resin material 12 are used.
Although it was embodied when using the resin material 13 of
It can be embodied in other cases as long as a different resin material is used regardless of the soft property.

(4) In each of the above embodiments, the cowl louver top divided pieces 1 and 31 are embodied as resin products.
It may be embodied as an exterior product such as an automobile garnish or a back panel, or an interior product such as an instrument panel.

[0052]

As described in detail above, according to the first aspect of the present invention, one side surface of the plate-shaped main body is made of a different resin material, and is continuously branched from the auxiliary portion. In the resin product in which the branch portion formed by the above is integrally formed, the narrowed portion is formed between the accessory portion and the branch portion. Therefore, another cavity for molding the branch portion is filled with the resin material through the flow path for molding the narrowed portion, and the pressure of the resin material filled for molding the branch portion is reduced. As a result, the excellent effect that it is possible to prevent the occurrence of a "sink" in the molding on the opposite side surface of the main body portion due to the molding of the branch portion is exhibited.

According to the second aspect of the present invention, a resin product molding die is formed by integrally molding another member made of a different resin material on one side surface of the plate-shaped main body. It is based on the device. Then, when injecting the second resin material into the second cavity formed between the two molds, the slide core, and the main body, the flow passage should be narrowed and injected from the runner at a portion communicating with the second cavity. Thus, the separate member is formed integrally with the main body. Therefore,
The second cavity is filled with the second resin material injected through the narrowed flow path, and the filling pressure of the resin material is reduced. As a result, the excellent effect that it is possible to prevent the occurrence of a sink mark on the opposite side surface of the main body portion due to the molding of the separate member is exhibited.

[Brief description of drawings]

FIG. 1 is a plan view showing a divided piece of a cowl louver top in a first embodiment embodying the first and second inventions.

FIG. 2 is a plan view showing a buffer portion on the rear surface side of the divided piece in the first embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 1 in the first embodiment.

FIG. 4 is a cross-sectional view showing a part of the mold device corresponding to the line AA in FIG. 1 in the first embodiment.

FIG. 5 is a cross-sectional view showing a part of a mold device for explaining the manufacturing process of the divided pieces in the first embodiment.

FIG. 6 is a cross-sectional view showing a part of a mold device for explaining the manufacturing process of the divided piece in the first embodiment.

FIG. 7 is a cross-sectional view showing a part of the mold device for explaining the manufacturing process of the divided piece in the first embodiment.

FIG. 8 is a cross-sectional view showing a part of the mold device corresponding to the line BB in FIG. 1 in the first embodiment.

FIG. 9 is a cross-sectional view showing a part of the mold device corresponding to the line CC of FIG. 1 in the first embodiment.

FIG. 10 is a cross-sectional view showing a split piece of a cowl louver top according to a second embodiment of the first invention.

FIG. 11 is a cross-sectional view showing a part of a mold device according to the second embodiment.

FIG. 12 is a cross-sectional view showing a part of a mold device for explaining a manufacturing process of divided pieces in the second embodiment.

FIG. 13 is a cross-sectional view showing a part of the mold device for explaining the manufacturing process of the split piece in the second embodiment.

FIG. 14 is a cross-sectional view showing a part of the mold device for explaining the manufacturing process of the divided piece in the second embodiment.

FIG. 15 is a cross-sectional view showing a conventional cowl louver top.

[Explanation of symbols]

1, 31 ... Divided pieces as a resin product, 2, 32 ... Louver main body portion, 3, 33 ... Louver edge portion as an accessory portion, 4, 3
4 ... Buffer part as branch part, 7 ... Buffer part, 10, 36 ...
Drawing part, 12 ... 1st resin material, 13 ... 2nd resin material, 14 ... 1st metal mold, 15 ... 2nd metal mold, 16 ... 1st
Slide core, 17 ... second slide core, 18 ... third slide core, 19 ... first cavity, 20 ... second cavity, 21 ... runner, 22, 25 ... diaphragm, 2
3 ... 4th slide core, 24 ... Cavity, 37 ... Drawing part.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koji Nakao 1 Ochiai, Nagachi, Kasuga-cho, Nishikasugai-gun, Aichi Toyota Gosei Co., Ltd. Toyoda Gosei Co., Ltd.

Claims (2)

[Claims] 1. A plate-shaped main body (2, 32) molded from a first resin material (12), and a second resin material (13) different from the first resin material (12). A resin product having an auxiliary part (3, 33) integrally formed with the main body part (2, 32), wherein the auxiliary part (3, 33) is continuously branched, and the second resin material ( 13) a branch part (4, 34) integrally formed on one side surface of the main body part (2, 32), and between the accessory part (3, 33) and the branch part (4, 34). A resin product having a narrowed portion (10, 36) to be formed. 2. A slide core (16-18, 23) is provided in one of the two molds (14, 15), and the two molds (14, 15) and the slide core (16) are clamped. ~ 18,23) to the cavity (19,20) formed between the slide core (16 ~ 1).
(8, 23) before and after moving different resin materials (12,
13) is injected from a runner (21) to integrally mold one resin product (1), the two molds (14, 15) are clamped, and the two molds (14, 15) are clamped. ) And the slide core (16-18, 2)
3) to form a first cavity (19) with the first
And a second step of molding a plate-shaped main body (2) by injecting a first resin material (12) into the first cavity (19) from the runner, The slide cores (16-18, 23) are moved to move the molds (14, 15) and the slide cores (16-1).
8, 23) and a third step of molding a second cavity (20) between the main body (2), and a second resin material (13) for the second cavity (20). The second resin material (13) is integrally molded with the main body (2) by squeezing and injecting a flow path from the runner (21) to a portion communicating with the second cavity (20). And a fourth step, which is a method for molding a resin product.