JP2998142B2 - Multicolor molding die 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 mold apparatus for multicolor molding, and more particularly to a mold apparatus for multicolor molding having an improved nozzle touch portion.

[0002]

2. Description of the Related Art As an example of a conventional two-color molding die,
This will be described with reference to FIG. As shown in FIG. 1, the mold 1 includes a fixed mold member 2 and a movable mold member 3 that move in the vertical direction in the figure to open and close, and a mold member for forming a different color part in a molded product. And a cavity 5 in the shape of a molded product is formed between the fixed mold member 2, the movable mold member 3 and the slide core 4. Note that a plurality of cavities 5 are formed for multi-cavity production. The fixed-side mold member 2 is mounted on a fixed-side mounting plate 9 for mounting to a fixed-side platen of an injection molding machine main body via receiving plates 6 and 7 and a spacer block 8. A manifold 10 having a built-in heater (not shown) is provided between the receiving plate 7, the spacer block 8, and the fixed-side mounting plate 9. The movable mold member 3 includes:
Through the receiving plates 11, 12, 13 and the spacer block 14,
It is mounted on a movable side mounting plate 15 for mounting the injection molding machine body on a movable side platen. The slide core 4 includes the movable mold member 3 and the receiving plate 11,
A movable unit 16 is mounted on the receiving plate 13 so as to be movable in a predetermined range in the vertical direction in the figure, and is driven by a driving device 16 such as a hydraulic or electromagnetic cylinder device incorporated in the receiving plate 13. When the fixed mold member 2 and the movable mold member 3 are clamped, and the slide core 4 is lifted up and contacts the fixed mold member 2, the fixed mold member 2 and the movable mold member 3 A first cavity filled with a first resin is formed between the mold member 3 and the slide core 4, and the slide core 4 after the first resin is solidified in the first cavity is illustrated. In the lowered state, a second cavity filled with a second resin is formed between the fixed mold member 2, the slide core 4, and the solidified first resin. A projecting plate 17 is supported between the receiving plate 13, the spacer block 14, and the movable-side mounting plate 15 so as to be movable in the vertical direction in the figure relative to the projecting plate 17. A projecting pin 18 for projecting a molded product when the mold is opened is fixed.

The fixed side mounting plate 9 is connected to a first sprue bush 21 to which a nozzle of a first cylinder of an injection molding machine body is connected and a nozzle of a second cylinder of the injection molding machine body. The second sprue bush 22 is aligned and integrally assembled in a penetrating state. The inside of the first sprue bush 21 is the first sprue 23, and the inside of the second sprue bush 22 is the second sprue bush 22. 2
The sprue is 24. Also, the fixed side mounting plate 9
Locating rings 25 and 26 are provided on the upper surface of the drawing in correspondence with the sprue bushes 21 and 22, respectively.
Further, band heaters 27 and 28 are provided on the outer peripheral portions of the sprue bushes 21 and 22, respectively. Further, in the manifold 10, a first runner 29 communicating with the first sprue 23 and a second runner 30 communicating with the second sprue 24 are formed independently of each other. Further, the stationary mold member 2 and the receiving plates 6, 7
A first gate bush 31 and a second gate bush 32 are respectively assembled to each of the cavities 5. The inside of the first gate bush 31 communicates with the first runner 29, and the inside of the second gate bush 32 communicates with the second runner 30. A first gate 33 that opens to the first cavity is formed at the tip of the first gate bush 31, and the second cavity is formed at the tip of the second gate bush 32. A second gate 34 having an opening is formed. A gate is provided in each of the bushes 31 and 32.
Valves 35 and 36 for opening and closing 33 and 34 are supported so as to be movable in the vertical direction in the figure. These valves 35, 36 are connected to hydraulic or pneumatic cylinder devices 37, 38 mounted on the fixed-side mounting plate 9 through the manifold 10, and are driven by the cylinder devices 37, 38. . The fixed mounting plate 9 is also provided with guide pins 41, bolts 42 for fixing the spacer block 8, a cooling passage 43, and the like.

[0004] With the above configuration, at the time of molding, first, a first cavity portion is formed between the fixed mold member 2, the movable mold member 3 and the slide core 4, and the first cavity portion is connected to the first sprue bush 21. The first resin is injected from the nozzle of the first cylinder of the main body of the injection molding machine. The first resin is supplied to the first gate through the first sprue 23, the first runner 29 of the manifold 10, and the first gate bush 31.
From 33, it flows into the first cavity and is filled.
After the first resin is solidified in the first cavity,
The slide core 4 is lowered as shown in the figure, and the second mold is placed between the fixed mold member 2, the slide core 4 and the solidified first resin.
And the second resin is injected from the nozzle of the second cylinder of the injection molding machine main body connected to the second sprue bush 22. The second resin flows from the second gate 34 into the second cavity through the second sprue 24, the second runner 30 of the manifold 10, and the second gate bush 32, and is filled. . Further, after the second resin is solidified in the second cavity, the fixed mold member 2 and the movable mold member 3 are opened, and the molded product is protruded by the protruding pin 18 and released. .

[0005]

As described above, in the injection molding machine for two-color molding, there are two cylinders, one for the first resin and the other for the second resin. Two sprue bushes 21 and 22 of a first sprue bush 21 which is a nozzle receiver to which the nozzle of one cylinder is connected and a second sprue bush 22 which is a nozzle receiver to which the nozzle of the second cylinder is connected are formed. is necessary. However, the pitch p between the two nozzles on the injection molding machine body side is
It varies from one injection molding machine body to another. In some cases, the first cylinder and the nozzle at the tip thereof are parallel to the second cylinder and the nozzle at the tip thereof. However, if they are arranged in parallel, they obstruct each other. In some cases, the nozzle and the second cylinder and the nozzle are inclined at an acute angle to each other. However, in the conventional mold 1, since the first sprue bush 21 and the second sprue bush 22 are integrally assembled to the fixed side mounting plate 9, the pitch p of the two nozzles of the main body of the injection molding machine is reduced. There was a problem that could not cope with the difference in angle. That is, conventionally, a dedicated mold 1 has to be used for each injection molding machine body having different pitches p and angles of the two nozzles, and the versatility of the mold 1 for different injection molding machine bodies has been increased. There was no problem. The pitch of the two sprue bushes 21 and 22 on the fixed-side mounting plate 9 is regulated by the pitch p of the two nozzles on the injection molding machine main body side. This allows the fixed-side mounting plate 9 and the manifold 10 to be designed. There were also problems with restrictions. That is, for example, in addition to the sprue bushes 21 and 22, the fixed side mounting plate 9 includes cylinder devices 37 and 38 for driving valves 35 and 36, guide pins 41 and bolts.
Although 42 and the like are provided, a large space is required for the arrangement of the sprue bushes 21 and 22, so that the arrangement of each member on the fixed-side mounting plate 9 is restricted. Further, the sprue bush 2 is attached to the fixed-side mounting plate 9.
Since large holes for assembling 1, 22 are formed side by side, there was also a problem such as a decrease in mold strength.

SUMMARY OF THE INVENTION The present invention is directed to solving the above-described problems. In a multi-color molding die apparatus such as a two-color molding die, injection molding in which the pitches and angles of a plurality of nozzles are different. An object of the present invention is to increase the versatility by reducing the restriction on the design of the fixed-side mounting plate and the manifold by enabling the common use to the machine body.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a multicolor molding die apparatus according to the present invention has a plurality of cavities which are mutually continuous and form a plurality of cavities filled with different color resins. A fixed-side mounting plate having a plurality of possible mold members and a plurality of resin passages that support the fixed-side mold members among these mold members and are attached to the main body of the injection molding machine and communicate with the plurality of cavities, respectively. When,
A plurality of nozzles which are detachably mounted on the outside of the fixed side mounting plate and which respectively inject a different color resin from the injection molding machine main body into the cavity portion are connected, and a plurality of nozzle receivers respectively connected to the respective resin passages. Nozzle attachment.

[0008]

According to the multicolor molding die apparatus of the present invention, a nozzle receiving attachment having a nozzle receiving section which matches a pitch and an angle of a plurality of nozzles of an injection molding machine body to be used is formed on the outer side of the fixed side mounting plate. In advance. At the time of molding, the plurality of nozzles of the injection molding machine body are connected to the plurality of nozzle receivers of the nozzle receiver attachment, respectively, and successive cavity portions are sequentially formed between the mold members. Are sequentially filled with resins of different colors, respectively. At this time, each resin flows from the nozzle receiver to which the nozzle for injecting the resin is connected, into the corresponding cavity through the corresponding resin passage of the fixed-side mounting plate. The same die can be used for an injection molding machine body having a plurality of nozzles having different pitches and angles by exchanging only the nozzle receiving attachment, and the above-described multi-color molding can be performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a two-color molding die apparatus of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. Parts corresponding to those of the conventional mold 1 shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. The lower portion of the drawing than the receiving plate 7 is the same as the conventional mold 1 shown in FIG. In the mold of this embodiment, as shown in FIG.
In addition, a first resin passage 51 and a second resin passage 52 are formed side by side, and a heater is embedded around the resin passages 51 and 52 (not shown).
The first resin passage 51 is provided with a first runner of the manifold 10 substantially similar to the conventional mold 1 shown in FIG.
29 and communicates with the first cavity. On the other hand, the second resin passage 52 communicates with the second runner 30 of the manifold 10 and communicates with the second cavity. Reference numeral 56 denotes a nozzle receiving attachment. The nozzle receiving attachment 56 is detachably attached to the outer surface on the upper side of the fixed side mounting plate 9 by bolts 57 or the like. And the nozzle receiving attachment 56
A first sprue bush 58 serving as a first nozzle receiver and a second sprue bush 59 serving as a second nozzle receiver are integrally incorporated in the through hole. The inside of the first sprue bush 58 is a first sprue 60 connected to the first resin passage 51 of the fixed side mounting plate 9, and the inside of the second sprue bush 59 is The second sprue 61 communicates with the second resin passage 52 of the fixed-side mounting plate 9. The upper part of both sprues 60 and 61 in the figure is a nozzle
a, 61a, the second sprue 61 has a bent portion 61b in the middle part, and the lower part of the drawing shows the second sprue 60a.
Is approaching. Thereby, both nozzle touch parts 60a, 61a
The pitch between the two resin passages 51 and 52 is smaller than the pitch p between them. Although not shown,
A heater is embedded around the two sprue bushes 58, 59. FIG. 2 shows another nozzle receiving attachment 66. This nozzle receiver attachment
66 is also detachably attached to the outer surface of the fixed-side attachment plate 9, and includes a first nozzle receiver as a first nozzle receiver.
Sprue bush 68 and the second nozzle receiver
And the sprue bush 69 are integrally incorporated in a penetrating state. The first sprue bush 68 has a first sprue having a nozzle touch portion 70a at the top in the figure.
The inside of the second sprue bush 69 has a second sprue 71 having a nozzle touch portion 71a at the upper part in the figure.
However, the lower portion of the second sprue 71 in the figure is bent, so that both nozzle touch portions 70a, 71a
Are inclined at an acute angle to each other downward in the figure. Further, in FIG. 1, reference numeral 76 denotes a fixed side platen of the injection molding machine main body to which the fixed side mounting plate 9 is mounted, and 77 denotes a first resin connected to the first sprue bush 58 of the nozzle receiving attachment 56. The first nozzle 78 of the main body of the injection molding machine for injecting the second resin is the second nozzle of the main body of the injection molding machine for injecting the second resin connected to the second sprue bush 59 of the nozzle receiving attachment 56. .

Next, the operation of the above configuration will be described. At the time of molding, the first injection molding machine
Nozzle attachment having sprue bushes 58, 59 that match the pitch and angle between the first and second nozzles
56 and 66 are attached to the fixed-side attachment plate 9 in advance. For example, when using the injection molding machine main body shown by the chain line in FIG. 1, the nozzle receiving attachment 56 shown in FIG. At the time of molding, the mounting plates 9 and 15 of the mold 1 are mounted on the platen 76 of the injection molding machine main body, and the first nozzle 77 and the second nozzle 78 are mounted.
Are connected to the first sprue bush 58 and the second sprue bush 59 of the nozzle receiving attachment 56, respectively. Then, similarly to the conventional mold 1 already described, first, a first cavity portion is formed between the fixed mold member 2, the movable mold member 3, and the slide core 4, and the first nozzle is formed. Inject the first resin from 77. This first resin is used for the first sprue 60 of the nozzle receiving attachment 56,
First resin passage 51 of fixed mounting plate 9, manifold
Through the first runner 29 and the inside of the first gate bush 31, the first gate 33 flows into and fills the first cavity. Next, after the first resin is solidified in the first cavity portion, the slide core 4 is moved, and the second resin is moved between the fixed mold member 2, the slide core 4 and the solidified first resin. Forming a cavity part of
The second resin is injected from the second nozzle 78. This second resin is supplied to the second sprue of the nozzle receiving attachment 56.
61, the second resin passage 52 of the fixed side mounting plate 9, the second runner 30 of the manifold 10, and the second gate bush
Through the interior of the second gate 32, the second gate 34 flows into the second cavity and is filled.

Then, the first nozzle 77 and the second nozzle 78
The same mold 1 can be used by exchanging only the nozzle receiving attachments 56 and 66 for the injection molding machine main body having a different pitch p or angle from the above, and the two-color molding as described above can be performed. . For example, for an injection molding machine body in which the two nozzles 77 and 78 are parallel and the pitch p between them is different, the same as the nozzle receiving attachment 56 shown in FIG.
The pitch p between the nozzle touch portions 60a and 61a is
Nozzle receiving attachment 56 same as pitch p between 7 and 78
Can be replaced with In the case of an injection molding machine main body in which the first nozzle and the second nozzle are inclined with respect to each other, a nozzle receiving attachment 66 as shown in FIG. 2 may be used.

As described above, according to the above-described embodiment, only the nozzle receiving attachments 56 and 66 are replaced, so that the two nozzles 77 and 78 have different pitches and angles with respect to each injection molding machine main body. The mold 1 for color molding can be used in common, and the versatility of the mold 1 is enhanced, and the economic efficiency is enhanced. The pitch between the first resin passage 51 and the second resin passage 52 of the fixed-side mounting plate 9 is determined by the nozzles 77 and 78 on the injection molding machine main body side.
It is not restricted by the pitch between them and can be set independently of this. In particular, since the pitch between the resin passages 51 and 52 can be reduced, the degree of freedom in the arrangement of each member on the fixed-side mounting plate 9 is also improved, and restrictions on the design of the fixed-side mounting plate 9 are reduced. At the same time, restrictions on the design of the manifold 10 are reduced. Furthermore, the fixed side mounting plate 9
Since the resin passages 51 and 52 may be thin, the strength of the fixed-side mounting plate 9 can be improved.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made. For example,
In the above-described embodiment, the two-color molding has been described as an example.

[0014]

According to the present invention, a plurality of nozzles are connected to the outside of the fixed side mounting plate and are respectively formed from the injection molding machine body into the resin cavities of different colors, and a plurality of nozzles formed on the fixed side mounting plate. A nozzle receiving attachment having a plurality of nozzle receivers respectively connected to the resin passages is detachably attached. As a result, the multi-color molding die can be used in common, and the versatility of the die is enhanced, and the economy is enhanced. In addition, since the pitch between the plurality of resin passages of the fixed-side mounting plate can be set without being restricted by the pitch between the nozzles of the injection molding machine main body, the degree of freedom such as the arrangement of each member on the fixed-side mounting plate is also increased. Improved and reduced constraints on the design of fixed-side mounting plates and manifolds.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the vicinity of a fixed-side mounting plate and a nozzle receiving attachment showing an embodiment of a multicolor molding die apparatus of the present invention.

FIG. 2 is a sectional view showing another example of the nozzle receiving attachment.

FIG. 3 is a sectional view showing an example of a conventional multi-color molding die apparatus.

[Explanation of symbols]

 2 Fixed mold member (mold member) 3 Movable mold member (mold member) 4 Slide core (mold member) 9 Fixed mounting plate 51 First resin passage (resin passage) 52 Second resin Passage (resin passage) 56 Nozzle receiver attachment 58 First sprue bush (nozzle receiver) 59 Second sprue bush (nozzle receiver) 66 Nozzle receiver attachment 68 First sprue bush (nozzle receiver) 69 Second sprue bush ( Nozzle receiver) 77 1st nozzle (nozzle) 78 2nd nozzle (nozzle)

Claims (1)

(57) [Claims] 1. A plurality of mutually movable mold members forming a plurality of cavity portions which are continuous with each other and are filled with different color resins, respectively, and a fixed-side mold member among these mold members is supported. A fixed mounting plate having a plurality of resin passages attached to the injection molding machine body and respectively communicating with the plurality of cavities, and a resin of a different color than the injection molding machine body detachably mounted outside the fixed mounting plate. A multicolor molding die apparatus, comprising: a nozzle receiving attachment having a plurality of nozzles respectively connected to the cavity portion and having a plurality of nozzle receivers respectively connected to the resin passages.