JPH0976287A - Method of molding laminated molded article and molding die - Google Patents

Abstract

(57) [Abstract] [Problem] Laminated molded articles can be obtained at low cost.
Provided is a method for molding a laminated molded article. SOLUTION: A fixed mold (1), a movable mold (10), a pair of rotating molds (20, 20 ') rotatably provided in these molds, and a holding device (30, 30). ') Is used. Fixed mold (1) in primary molding
A cavity (4, 5, 23, 35, 35 ') composed of a movable mold (10), a rotary mold (20, 20') and a holding device (30, 30 ') is injected and filled with a hard material. Then, the primary molded product is molded. In the secondary molding, the movable mold (10) is opened while a part of the primary molded product is held by the holding device (30, 30 ′), and the rotary mold (20, 2 ′) is opened.
0 ′) is rotated to secure a cavity (26) for secondary molding on the outside of the primary molded product, and is filled with a soft material.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fixed type, a movable type,
Using a pair of rotating molds rotatably provided in these molds, a mold including a holding device, etc., a method for molding a laminated molded product for molding a laminated molded product and a method for molding the same The present invention relates to a molding die used for practice.

[0002]

2. Description of the Related Art A variety of molded products can be obtained by the injection molding method, but recently, in order to further increase the added value, a laminated molded product, for example, a hard material for imparting strength is surrounded. In addition, a laminated molded product is formed by integrally molding a soft material for giving a soft touch feeling. As a method for molding such a laminated molded article, two molds are prepared and the molds are sequentially replaced while the molds are exchanged. A primary molding insert is embedded in the mold and the surrounding space is formed. There is known an insert molding method and the like obtained by injecting a soft material into.

[0003]

Although a laminated type molded product can be obtained by the conventional molding method as described above, the former method requires two molds to be prepared. There is a drawback that the manufacturing cost of the mold increases and the cost of mechanical equipment for operating the mold increases. In addition, the insert method also has the disadvantage that the mechanical equipment cost is high and the molding method is complicated. Therefore, it is an object of the present invention to provide a method for molding a laminate-molded article and a mold used for carrying out this method, by which a laminate-shaped molded article can be obtained at low cost.

[0004]

In order to achieve the above-mentioned object, a mold for molding a plurality of articles according to the present invention comprises:
Using a movable die, a pair of rotating dies rotatably provided in these dies, and a die comprising a holding device,
In the primary molding, the cavity formed by the fixed mold, the movable mold, the rotary mold and the holding device is injection-filled with the first molten resin to mold the primary molded product, and in the secondary molding, The movable mold was opened while a part of the secondary molded product was held by the holding device, and the rotary mold was rotated to secure the cavity for the secondary molding outside the primary molded product. The cavity is configured to be injection-filled with the second molten resin. According to a second aspect of the invention, the holding member of the holding device according to the first aspect is configured to mold a part of the primary molded product. The invention according to claim 3 is a mold including a fixed mold, a movable mold, a pair of rotary molds rotatably provided in these molds, and a holding device. The mold has a first recess that forms a relatively small first cavity at the first position, and a relatively large second cavity that is rotated by a predetermined angle from the first position. At least two second recesses are provided, and the holding device is composed of a pair of holding members that are movably provided in the fixed mold and the movable mold, respectively, and these holding members are parted from each other. It is urged to move toward the line side. In the invention according to claim 4, recesses are formed at the tip end portions of the pair of holding members according to claim 3, and these recesses form a cavity having substantially the same size as the second cavity. ing.

Therefore, the pair of rotary molds is rotated to the first position where the relatively small first cavity is formed. Then, the movable die is clamped to the fixed die. Then, the movable mold, the fixed mold, the pair of rotary molds, and the holding device form a cavity for primary molding. Therefore,
For example, from a two-head injection molding machine, the measured first injection material is injection-filled into the cavity to perform primary molding. When the primary molded product solidifies, open the movable mold a little. Then, the holding device holds the primary molded product in a state of being separated from the fixed mold, the movable mold, the pair of rotary molds, and the like. While being held, the pair of rotary molds are rotated to the second position where the cavity for secondary molding is secured outside the primary molded product. Then, the movable die is clamped to the fixed die. Then the second
The injection material is injected and filled into the cavity for secondary molding.
After cooling and solidifying, the movable mold is opened and the molded product is taken out.
The same operation is repeated thereafter for molding.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to a mold for molding a handle and a molding method thereof. The handle T is configured as a door handle or a handle for lowering a load, and as shown in FIG. 3, it is composed of a central grip portion N and both end portions S, S of the grip portion N. Assumed to be configured. Further, the entire end portions S, S and the core portion N ′ of the grip portion N are made of a hard material such as acrylic resin A.
, And the perimeter of the grip N is assumed to be molded from elastomer E, which is a soft material.

The mold according to the embodiment of the present invention is shown in FIG.
As shown in FIG. 1, a fixed die 1, a movable die 10 paired with the fixed die 1, a first rotary die 20 rotatably provided inside the fixed die 1, an inside of the movable die 10. Similarly, a second rotary mold 20 ′ that is rotatably provided, and two holding devices 30 that are provided above and below the rotary molds 20 and 20 ′ in FIG. 30 'and the like.

On the parting line P side of the fixed die 1,
First and second recesses 2 and 3 for molding the ends S of the handle T described above with reference to FIG. Also, on the parting line P ′ side of the movable die 10, first and second depressions 12 and 13 that are paired with the first and second depressions 2 and 3 of the fixed die 1 are similarly provided.
Therefore, when the movable die 10 is clamped to the fixed die 1 as shown in FIG.
The two recesses 2, 3 and 12, 13 constitute an upper cavity 4 and a lower cavity 5 for molding the ends S, S and the tips S ′, S ′ of the handle T.
The fixed mold 1 is provided with a first sprue 27 communicating with the first recess 2.

Thus, the fixed die 1 and the movable die 10 are
Upper and lower cavities 4, 5 divided by the first and second recesses 2, 3 and 12, 13 are formed, and the first and second cavities 4, 5 are filled so as to fill the space between them.
The rotary molds 20 and 20 'are rotatably provided.
In order to rotatably support the first and second rotary molds 20 and 20 ′ around an axis perpendicular to the paper surface in FIG. 1B, the fixed mold 1 and the movable mold 10 have rotary molds. Bearing holes 6, 16
Are provided respectively. These rotary mold support holes 6 and 16 are partially open on the parting line P and P ′ sides. Therefore, first and second rotary molds 2 to be described later
The first and second parting surfaces 21, 21 'and 24, 24' of 0, 20 'can be flush with the parting lines P, P'of the fixed mold 1 and the movable mold 10. Also, openings 7 and 17 are opened on the opposite side of these openings, and the first and second rotary molds 2 are opened from these openings 7 and 17.
It is also designed to rotate 0, 20 '.

Since the first and second rotary molds 20 and 20 'have substantially the same structure, hereinafter, mainly the first rotary mold 2 will be described.
0, and for the second rotary mold 20 ',
In the drawings, the same reference numeral is appended with a dash "'" to avoid duplicate description. As shown in FIG. 1B, the first rotary mold 20 is flush with the parting line P when the movable mold 10 is clamped to the fixed mold 1. , Partly chopped off to form a first parting surface 21. The first parting surface 21 is provided with a first rotation recess 22 having a relatively small diameter. The first rotary recess 22 and the second rotary mold 2
The first rotation recess 22 ′ of 0 ′ and the first rotation recess 22 ′ for forming the core portion N ′ of the grip portion N of the handle T shown in FIG.
The cavity 23 is formed. In addition, a second parting surface 24 is also formed at a right angle to the first parting surface 21, and the second parting surface 24 also has a second rotating portion having a diameter larger than that of the first rotating recess 22. A recess 25 is formed. The second rotary recess 25 and the second rotary mold 2
The grip N of the handle T is formed by the second rotary recess 25 'of 0'.
A second cavity 26 for molding the is formed.
The second cavity 26 is shown in FIGS.

The first rotary mold 20 has a structure shown in FIG.
As shown in (b), the second sprue 28 is provided so as to penetrate the first rotary mold 20. One of the second sprues 28 opens into the second rotation recess 25, and when the second rotation recess 25 is rotated to the second position facing the parting line P, the other of the second sprue 28 is fixed. It is located on the side of the opening 7.

Since the holding devices 30 and 30 'provided above and below the rotary molds 20 and 20' have the same structure, the upper holding device 30 will be mainly described below.
The lower holding device 30 'is given the same reference numeral with a dash "'" in the drawings to avoid duplication. Holding device 30
2 is composed of a pair of holding members 31, 31 and spring members 32, 32 as best shown in FIG. These holding members 31, 31 are provided inside the fixed mold 1 and the movable mold 10 so as to be movable in the horizontal direction in the figure, and are biased by the spring members 32, 32 toward the parting lines P, P ′, respectively. ing. Holding member 3
Each of the reference numerals 1 and 31 has a flange portion at its tip end, and its tip end surface is a parting surface 33. The recesses 34, 34 are formed on the parting surfaces 33, 33. The recesses 34, 34 form a cavity 35 for molding the end S of the handle T.

Next, a molding method using the molds 1, 10, 20, 20 'and the holding devices 30, 30' will be described. The first and second rotary molds 20 and 20 'are rotated to the first position to clamp the movable mold 10 to the fixed mold 1 as shown in FIG. Then, the movable mold 10 and the fixed mold 1 constitute upper and lower cavities 4 and 5. Further, the holding members 31, 31 and 31 ', 31' of the holding devices 30, 30 'constitute the cavities 35, 35', and similarly, the first and second rotary molds 20, 20 'make the first.
The cavity 23 is formed. The cavities 4, 5, 35, 35 ', 23 configured in this way are shown in FIG.

For example, from a two-head injection molding machine, the measured hard material is fed from the first sprue 27 to the cavities 4, 5, 35 ,.
35 'and 23 are injection-filled and primary-molded. The partially filled state is shown in FIG. By this primary molding, the ends S, S and the core N ′ of the handle T shown in FIG.
Is molded. When the primary molded product is solidified to some extent, the movable mold 10 is slightly opened. Then, the holding device 30, 30 '
The holding members 31, 31 and 31'31 'of 1 are opened. Therefore, the holding members 31, 31 and 31'3
1'projects to the outside of the parting lines P, P'by the spring members 32, 32, 32, 32 'while holding the ends S, S of the primary molded product. This protruding state is shown in FIG.
Is shown in If the primary molded product is difficult to separate from the upper and lower cavities 4, 5, etc., it can be pushed out by an ejector pin or the like.

The movable mold 10 is slightly opened, and the first and second rotary molds 20 and 20 'are rotated to the second position while the primary molded product is held by the ends S and S thereof. The rotated state to the second position is shown in FIG. In this second position, the second rotary recesses 25, 25 'form a large-diameter second cavity 26. The movable die 20 is clamped to the fixed die 1. Then, the second cavity 26
Thereby, the core portion N ′ of the handle T is surrounded with a predetermined space. From the two-head injection molding machine, the weighed soft material is injected and filled from the second sprue 28 into the cavity 26 for secondary molding. As a result, the soft material E is integrally formed on the outer peripheral portion of the core portion N '. The state in the middle of the secondary molding is shown in FIG. Waiting for cooling and solidification, movable type 2
Open 0 and take out the molded product. The same operation is repeated thereafter for molding.

The present invention is not limited to the above embodiment,
Various forms are possible. For example, in the above-described embodiment, the hard material is injected into the primary molding and the soft material is injected into the secondary molding, but it is also possible to inject in the reverse order to obtain a molded product having a hard outer material. It is also possible to inject the same material, or further to inject materials having different colors, physical or chemical properties of the injection material. At this time, as the injection machine, it is obvious that a two-color injection machine or the like can be applied in addition to the two-head injection molding machine. Further, in the above example, the handle T
Although a molded product other than the handle T can be molded in the same manner as described above, the cross-sectional shape is not limited to a circular shape, and a molded product having an unspecified shape such as an elliptical shape or a polygonal shape can be molded. It is also clear that you can do it. Furthermore, it is also possible to mold a molded product that does not require the ends S, S molded by the holding devices 30, 30 '. In this case, the holding device 3
The portion held by 0 and 30 'is also primary molded, and the retained portion is cut off after the secondary molding. Also, in the embodiment shown in the figures, the holding members 31, 31, 31 ',
31 'is urged by springs 32, 32, 32', 32 ', but it is clear that it can be urged by fluid pressure such as compressed air instead of springs.

In the above embodiment, the first and second rotary molds 2 are used.
The first and second rotary recesses 22, 22 ', 2
Although only 5 and 25 'are provided, a multi-layer molded product can be obtained in the same manner by providing three or more recesses having different diameters. Also, the first and second parting surfaces 21, 24 and 21 ', 2 of the first and second rotary molds 20, 20', 2 '
It is clear that the 4's are at right angles to each other, but they do not necessarily have to be at right angles. Furthermore, the holding device 3
Two pieces of 0 and 30 'are provided to sandwich the first and second rotary molds 20 and 20' for stabilization, but it is clear that one piece may be provided depending on the shape of the molded product. . Also, in the illustrated embodiment, the first sprue 2
7 is provided on the fixed mold 1, but it can be provided on the first rotary mold 20 so as not to short-circuit with the second sprue 28 by forming a hot runner.

[0018]

As described above, according to the present invention, there is provided a fixed die, a movable die, a pair of rotary dies rotatably provided in these dies, and a die including a holding device. In the primary molding, a cavity formed by a fixed mold, a movable mold, a rotary mold and a holding device is injection-filled with a first molten resin to mold a primary molded product, and a secondary molding is performed. In, in the state where a part of the primary molded product is held by the holding device, the movable mold is opened, and the rotary mold is rotated to secure a cavity for secondary molding outside the primary molded product. Since the secured cavity is injection-filled with the second molten resin, it is possible to mold a laminate-molded shaped product with a die having one surface. Therefore, according to the present invention, it is possible to reduce the cost of the mold and the equipment, and to obtain the effect of molding the laminated molding product at low cost. According to the invention as set forth in claim 2, in addition to the above effect, since a part of the primary molded product is molded by the holding member of the holding device, it is effective without cutting off the primary molded product held by the holding member, for example. The effect that can be used is obtained.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a molding die of the present invention,
(A) is a vertical cross-sectional view that schematically shows the mold, and (b)
FIG. 4 is a horizontal cross-sectional view showing a part of it by breaking.

FIG. 2 is a horizontal cross-sectional view showing a part of the molding die according to the embodiment of the present invention in a cutaway manner.

FIG. 3 is a cross-sectional view of a handle molded according to an embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view schematically showing a partially broken state of the primary molding according to the embodiment of the present invention.

FIG. 5 is a horizontal cross-sectional view schematically showing a partially opened state of the movable die after the primary molding according to the embodiment of the present invention.

FIG. 6 shows a first molding after the first molding according to the embodiment of the present invention.
It is a horizontal sectional view which shows a state which rotated the 2nd rotation metallic mold to the 2nd position as a partial section, and is shown typically.

FIG. 7 is a vertical cross-sectional view schematically showing a partially cut state of the secondary molding according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed mold 10 Movable mold 20, 20 'Rotating mold 4, 5, 2335, 35' Cavity for primary molding 26 Cavity for secondary molding 30, 30 'Holding device 31, 31' Holding member

Claims (4)

[Claims] 1. A fixed mold (1), a movable mold (10), a pair of rotary molds (20, 20 ') rotatably provided in these molds, and a holding device (30, 30). 30 ') is used, In the primary molding, the fixed mold (1) and the movable mold (10)
Rotating mold (20, 20 ') and holding device (30, 3)
0 ') and cavities (4, 5, 2)
Injection-fill the first molten resin into 1, 3, 35, 35 ') to
In the secondary molding, the movable mold (10) is opened in a state where a part of the primary molded product is held by the holding device (30, 30 ′), and then the rotary mold (20, Rotate 20 ') to 1
A method for molding a laminate-molded article, characterized in that a cavity (26) for secondary molding is secured outside the next molded article, and the secured cavity (26) is injected and filled with a second molten resin. 2. The holding device (30, 3) according to claim 1.
0 ') holding member (31, 31, 31', 31 '),
A method for molding a laminate-molded article, which comprises molding a part of a primary molded article. 3. A fixed mold (1), a movable mold (10), a pair of rotary molds (20, 20 ') rotatably provided in these molds, and a holding device (30, 30). 30 '), wherein the pair of rotary dies (20, 20') has a first recess (22) in which a relatively small first cavity (23) is formed at a first position. , 22 ') and a relatively large second cavity (26) at a second position rotated from the first position by a predetermined angle.
And at least two second recesses (25, 25 ') each of which is provided, and the holding device (30, 30') is the fixed mold (1).
And a pair of holding members (31, 31, 31 ', 31') movably provided on the movable die (10), respectively, and these holding members (31, 31, 31 ',
31 ') is a molding die for a laminated molded article that is urged so as to move toward the parting line (P, P') side. 4. A pair of holding members (31, 31) according to claim 3.
(31, 31 ', 31') has recesses (34, 3
4, 34 ', 34') are formed and these recesses (3
4, 34, 34 ', 34'), the cavity (35, 35 ') having substantially the same size as the second cavity (26).
A mold for forming a laminate-formed product, which is composed of: