JP3377547B2 - Multi-layer injection press molding equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer injection press molding apparatus capable of laminating resin molding layers in multiple layers such as two layers or three layers by a so-called injection press molding method.

[0002]

2. Description of the Related Art Conventionally, for molding a resin molded article in which two or three resin molded layers are laminated by a so-called injection press molding method, for example, an automobile instrument panel, as shown in FIG. A so-called laminate sheet 7 in which the foam layer 7b is lined on the skin layer 7a is located between the cavity mold 2 and the core mold 3 of the injection press mold 1, and then the cavity mold 2 is directed toward the core mold 3. Down
During the descent of the cavity mold 2, the gate valve 4 provided in the core mold 3 is opened to inject the molten resin 5 onto the core mold 3, and subsequently the cavity mold 2 is moved to the core mold 3.
As shown in FIG. 2, the laminated sheet 7 and the molten resin 5 are pressed to simultaneously press the laminated sheet 7 to form the instrument panel 6 shown in FIG.

The laminated sheet 7 is as follows.
A vinyl chloride sheet is used as the skin layer 7a, and a PP foam sheet serving as the foam layer 7b is attached to the back surface thereof. Examples of the PP foam sheet 7b include Toray Pef (“Toray Pef” is a registered trademark of Toray Industries, Inc.) manufactured by Toray Industries, Inc.

[0004]

However, in the conventional molding method as described above, when the instrument panel 6 which is a molded product has large unevenness and deep drawing is required, the laminate sheet 7 is It is deeply squeezed by 2 and 3, and wrinkles are generated at the corners of the instrument panel 6, and wrinkles are likely to occur due to the complicated shape, or the corners that are deeply squeezed by the molds 2 and 3 are not deeply squeezed. Since the amount of return of the foamed layer 7b after pressing is different between the flat portion and the flat portion, there is a drawback that the outer shape is deformed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional drawbacks, and does not use a laminate sheet, and is a cavity mold of an injection press mold,
A molding device for sequentially injecting a resin material from either one of the core molds or from both molds, thereby molding the second layer on the first layer and sequentially molding the next layer on the molding layer. The purpose is to provide.

Therefore, according to the present invention, even when the instrument panel, which is a molded article, has a large unevenness or has a complicated shape, the laminated sheet is not used and the next layer is formed on the molding layer. Since the thermoplastic elastomer material is sequentially injected and press-molded, for example, since it can be molded as the mold shape without wrinkles at the corners as the instrument panel, product defects due to wrinkles do not occur, A multi-layer molded product of good quality can be obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in FIG.

4 to 6 show a first embodiment of the present invention. In this embodiment, a core mold 11 is installed on a table 12 of an injection press molding apparatus 10, and the core mold 11 is installed. The cavity mold 13 corresponding to is a mold clamper 14
And is fixed to the press ram 15 via the mold clamper 14. This press ram 15
When the hydraulic unit 16 is operated, the hydraulic unit 16 is moved up and down along the four columns 18 of the press mechanism 17.

A core mold 11 installed on the table 12
5, a sprue 19 is provided in the sprue 19, and a gate valve 20 is installed in the sprue 19. The gate valve 20 is an injection unit for injecting a molten resin material through a hot runner 21 or the like. It is connected to 22. Therefore,
When the gate valve 20 is opened, the molten resin material is supplied from the nozzle portion 23 of the injection unit 22 into the cavity between the molds 11 and 13. The molten resin material is cooled and solidified to form the core of the product. The material layer 24 is formed.

A mixing head 25 is installed in the cavity mold 13, and the mixing head 25 has a reactive solution A (polyol) and B.
Liquid (isocyanate) is supplied,
The liquids A and B are disturbed and mixed in the mixing head 25 and then injected from the sprue 26 into the cavity between the molds 11 and 13, which solidifies to form a skin layer 27 (see FIG. 6). It is a thing. It should be noted that the solvent-state paint may be injected from the pipe 26 in place of the mixed solution of the liquid A and the liquid B, which is a reactive solution.

Next, the molding operation in the molding apparatus will be described.

The nozzle unit 23 is operated by operating the injection unit 22.
The core mold 11 as shown in FIG.
Connect to. Next, the cavity mold 13 is lowered along the four columns 18 of the press mechanism 17. Cavity mold 13
When is close to the core mold 11, the gate valve 20 is opened and the molten resin material from the injection unit 22 is supplied into the cavity between the molds 11 and 13. The molten resin material supplied from the gate valve 20 into the cavity between the molds 11 and 13 is pressed by the descending cavity mold 13 to be molded into the core material layer 24.

Next, when the core material layer 24 is cooled and solidified, as shown in FIG. 6, the cavity mold 13 is lifted by the thickness dimension of the skin layer 27 to raise the cavity mold 13 and the core material layer 24.
A cavity for molding the skin layer 27 is formed between and. When this cavity is formed, the mixing head 25 is operated to supply the reactive resin material into the cavity formed between the cavity mold 13 and the core layer 24. As a result, the skin layer 27 is formed on the core material layer 24.

FIGS. 7 to 9 show a second embodiment of the present invention. In this embodiment, most of the construction is shown in FIG.
Since it is the same as the first embodiment of the present invention shown in FIG. 6, those portions are given the same reference numerals as those of the first embodiment, and the description thereof will be omitted. Differences will mainly be explained.

That is, a rail 28 is fixed to the press ram 15, and a template 29 is supported on the rail 28 so as to be movable in the horizontal direction. As shown in FIG.
9 is a first actuating member set at the left end of the press ram 15.
(For example, a hydraulic cylinder) 30 is operated to move in the horizontal direction.

The mold plate 29 includes a first cavity mold 13
a and the second cavity mold 13b are installed, and the first cavity mold 13a performs the first operation between the position shown by the solid line and the position shown by the chain double-dashed line in FIG.
The mold plate 29 is moved by the movement of a member (for example, a hydraulic cylinder) 30. At the same time, by moving the same mold plate 29, the second cavity mold 13b becomes
It moves to the position of the first cavity mold 13a shown by the solid line. Reference numeral 31 denotes a balancer bracket. The balancer bracket 31 adjusts the weight applied to the mold plate 29 so as to balance the weight left and right. The lower end of the balancer bracket 31 moves up and down, that is, as the mold plate 29 moves up and down. Has become.

As shown in FIG. 8, another sprue 32 is added to the second core type 11a in addition to the sprue 19,
A gate valve 33 is installed on the other sprue 32. The gate valve 33 is provided with a nozzle portion 36 of an injection unit 35 for injecting a molten resin material through a hot runner 34 or the like.
Connected with. Therefore, the molten resin material is supplied from the nozzle portion 36 of the injection unit 35 onto the second core mold 11 a that opens the gate 33.

The first cavity mold 13a has a structure shown in FIG.
As shown in FIG. 3, the stopper 37 is urged and attached by a spring 38 so as to always move downward.
When the two molds 11a and 13a are clamped, the opening of the other sprue 32 provided in the second core mold 11a in the cavity is closed. As a result, when the core layer 24 is molded, the molten resin material supplied from the nozzle portion 23 of the injection unit 22 is sprinkled by the sprue 3
It is designed not to flow into 2. Reference numeral 39 denotes a feeder, and the feeder 39 supplies the injection unit 35 with a resin material 40 which will be a skin layer 41, which will be described later, with respect to the injection unit 35.

The second cavity mold 13b is different from the first cavity mold 13a as shown in FIG.
Is not provided.

Next, the molding operation according to the second embodiment will be described. First, when molding, as shown in FIG.
The first cavity mold 13a is lowered with respect to the second core mold 11a, and the gate valve 20 is opened during this descent to open the sprue 19a.
Molten resin material is injected into the cavity from the core material layer 24
To mold.

When the molding of the core material layer 24 is completed in this way, the first cavity mold 13a is raised to a position separated from the second core mold 11a, and then the first actuating member (example
For example, the hydraulic cylinder 30 is operated to move the first cavity mold 13a from the position shown by the solid line in FIG. 7 to the position shown by the chain double-dashed line. At the same time, the second cavity mold 13b
Is moved to the position of the first cavity mold 13a shown by the solid line in FIG. In this state, the second cavity mold 13b is lowered to move the second cavity mold 13b to the second cavity mold 13b as shown in FIG.
The core mold 11a is clamped.

When this mold clamping is completed and the gate valve 33 is opened, the molten resin material 40 is supplied from the injection unit 35 into the cavity between the molds 11a and 13b, and as a result, the core layer 24 is covered with the skin layer. 41 is molded.

Next, a third embodiment of the present invention will be described.
It In the third embodiment, the spring 38 of the first cavity mold 13a of the second embodiment shown in FIG. 8 is replaced with the second work.
MEMBER (e.g., solenoid) 42 was installed, the second
The stopper 43 is fixed to the tip of the operating rod of the operating member 42, and the second work
The operation of the moving member 42 moves the plug 43 to close / open the opening of the sprue 32 provided in the second core mold 11a in the cavity. As a result, not only can the core material layer 24 be formed, but the skin layer 41 can be formed on the core material layer 24 simply by using the second core mold 11a and the first cavity mold 13a. .

10 to 13 show a fourth embodiment of the present invention . In this embodiment, as shown in FIG. 10 , a third cavity mold 13c and a second cavity mold 13b are provided. In addition, these cavity molds 13c, 1
The fourth cavity mold 13d is placed on the mold plate 29 so as to be located between the molds 3b. The third cavity mold 13c, as shown in FIG.
In FIG. 10 , the first actuating member is provided between three positions, that is, the position indicated by the solid line, the position indicated by the chain double-dashed line, and the position indicated by the dotted line.
(For example, hydraulic cylinder) The template 2 accompanying the operation of 30
The same template 2 can be moved by moving 9
With the movement of 9, the fourth cavity mold 13d and the second cavity mold 13b also move between the three positions.

As shown in FIG. 11 , a sprue 44 is further added to the third core type 11b in addition to the sprue 19 and the sprue 32. A gate valve 45 is installed in the sprue 44, The valve 45 is an injection unit 47 that injects a thermoplastic elastomer material via a sprue 46 or the like.
It is connected to the nodule part 48. Therefore, the gate valve 45
Open the inside of the cavity between the two molds 11b and 13d,
A thermoplastic elastomer material is supplied from the nodule portion 48 of the injection unit 47, and this elastomer material is used for both molds 11 and 11.
The cushion layer 49 of the product is formed by injection cooling and solidification in the cavity between b and 13d. The injection unit 47 is not shown in FIG. 10 because it is installed behind the third core mold 11b in FIG.

Next, the molding operation according to the fourth embodiment will be described. First, in the third cavity mold 13c, as shown in FIG.
As shown in FIG. 1 , the plug 37 is attached by being biased by the spring 38 so as to always move downward, and the plug 50 is further attached by being biased by the spring 51 so as to always move downward. And when the molds 11b and 13c are clamped, the sprue 4 provided on the third core mold 11b
4, the opening in the cavity is closed. As a result, when molding the core layer 24, the molten resin material supplied from the injection unit 22 is sprinkled by the sprue 4
It is designed not to flow into 4.

To form the core material layer 24, as shown in FIG. 11 , both the molds 11b and 13c are clamped to form the core material layer 24, and thereafter, as shown in FIG. In place of the third cavity mold 13c, the fourth cavity mold 13d is clamped to the third core mold 11b,
A thermoplastic elastomer material is supplied from the injection unit 47 into the cavity between b and 13d, and this elastomer material is injected into the cavity between the molds 11b and 13d to form the cushion layer 49. Then, as shown in FIG. 13 , instead of the fourth cavity mold 13d, the second cavity mold 13b is clamped to the third core mold 11b, and both molds 11b, 1b
The molten resin material is supplied from the injection unit 35 into the cavity between the 3b, and the molten resin material is solidified to form the skin layer 41 of the product.

According to the present invention as described above, the conventional laminated sheet 7 is used when the multilayer molding layers are molded by the conventional injection press molding method. The resin material is sequentially injected from either one of the cavity mold and the core mold of the mold, or from both molds, whereby the second layer is molded on the first layer, and the next layer is sequentially formed on the molding layer. Since it is molded, multilayer injection press molding can be performed without using the conventional laminate sheet 7 at all.

[0029]

Therefore, according to the present invention, even when the instrument panel, which is a molded product, has a complicated shape with large unevenness and deep narrowing, a laminated sheet is used without using a laminate sheet. Next, resin material is sequentially injected into the next layer and press molding is performed, so that wrinkles do not occur at the corners of the instrument panel and product defects due to these wrinkles do not occur and each layer has a suitable texture. The effect of being able to do is obtained.
In addition, multiple cavity molds attached to the press
Horizontal direction by the first actuating member (eg hydraulic cylinder)
Since it can be reciprocally moved in any direction, it is an extremely simple device.
The effect of being able to efficiently perform multi-layer resin molding in a short time
The fruit is obtained. Also, because the cavity mold is provided with a stopper
Therefore, the molten resin material does not flow into the sprue
The effect is obtained. In addition, a second actuating member (eg
If, the stopper is fixed to the tip of the solenoid), the second actuating unit
By installing the material so that it can move in and out,
Type as it is, not only molding of the core layer but also core material
The effect that the skin layer can be formed on the layer is obtained.
Be done.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional multilayer injection press molding method.

FIG. 2 is an explanatory view of a conventional multilayer injection press molding method.

FIG. 3 is a perspective view of a molded product manufactured by a conventional multilayer injection press molding method.

FIG. 4 is a front view of the device according to the first embodiment of the present invention.

FIG. 5 is an explanatory view of molding of the first embodiment of the present invention.

FIG. 6 is an explanatory view of molding of the first embodiment of the present invention.

FIG. 7 is a front view of the device according to the second embodiment of the present invention.

FIG. 8 is an explanatory view of molding of the second embodiment of the present invention.

FIG. 9 is a cross-sectional explanatory view of the essential parts of the second embodiment of the present invention.

FIG. 10 is a front view of the device according to the fourth embodiment of the present invention.

FIG. 11 is a molding explanatory view of the fourth embodiment of the present invention.

FIG. 12 is a molding explanatory view of the fourth embodiment of the present invention.

FIG. 13 is a molding explanatory view of the fourth embodiment of the present invention.

[Explanation of symbols]

10 ... Molding device 11 ... Core mold 11a ... Second core mold 11b ... Third core mold 12 ... Table 13 ... Cavity mold 13a ... First cavity mold 13b ... Second cavity mold 13c ... Third cavity mold 13d ... Fourth cavity Mold 14 ... Mold clamper 15 ... Press ram 16 ... Hydraulic unit 17 ... Press mechanism 18 ... Strut 19 ... Sprue 20 ... Gate valve 21 ... Runner 22 ... Injection unit 23 ... Nozzle part 24 ... Core layer 25 ... Mixing head 26 ... Tube 27 ... Skin layer 28 ... Rail 29 ... Template 30 ... First actuating member 31 ... Balancer bracket 32 ... Other sprue 33 ... Gate valve 34 ... Hot runner 35 ... Injection unit 36 ... Nozzle part 37 ... Plug 38 ... Spring 39 ... Feeder 40 ... Resin material 41 ... Skin layer 42 ... Second operating member 43 ... Plug 44 ... Sprue 45 ... Gate valve 46 ... Sprue 47 ... Injection unit 48 ... Nozzle part 49 ... Cushion layer 50 ... Plug 51 ... Spring

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (5)

(57) [Claims] 1. A press machine that moves up and down toward a core mold by the operation of an elevating member disposed on a machine frame, and allows a plurality of cavity molds to move horizontally and reciprocates by the operation of a first operation member. And a plurality of injection units for injecting a resin material into the core mold are connected to each other. 2. A multilayer structure comprising a core mold having a sprue and a plug for closing the sprue provided in the cavity mold so that the resin material does not flow into the sprue when molding the first layer. Injection press molding equipment. 3. A core mold is provided with a plurality of sprues,
The multilayer injection press molding apparatus according to claim 2, wherein a plurality of stoppers for closing the sprue are provided in the cavity mold. Wherein said plug, multilayer injection press forming apparatus according to claim 2 or 3, wherein it has been urged to protrude constantly by the pressing member. Wherein said plug, according to claim 2, characterized in that installed such infested moved by actuation of the second actuating member
Alternatively, the multi-layer injection press-molding apparatus according to item 3.