JP2770535B2 - Molding method and molding die for multicolor molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a molding method and a molding method of a multicolor molded article in which a resin is sequentially injected into a cavity formed between a fixed mold and a movable mold and molded. For molds.

[Conventional technology]

Conventionally, as a composite lens made of resin, for example, as shown in FIG. 5, there is known a composite lens in which a single convex lens 2 and a concave lens 3 are fitted and overlapped inside a cylindrical body 1. Have been.

[Problems to be solved by the invention]

However, in the above-mentioned conventional resin composite lens, since it is composed of three parts, ie, the cylindrical body 1, the convex lens 2 and the concave lens 3, it takes time and effort to assemble, and the cost is increased. It is difficult to join them with a sufficient degree of adhesion, and a space is easily created at the interface between the two lenses 2 and 3, which reduces the lens performance and causes moisture to enter the space due to the moisture entering this space. There was a problem that it was easy.

Then, as a result of intensive studies, the present inventors have found that the problems of the above-mentioned conventional compound lens can be solved all at once by applying the multicolor molding technique to perform integral molding.

The present invention has been made on the basis of the above findings, and it is an object of the present invention to provide a molded product such as a compound lens at low cost and easily, and to obtain a good quality product. An object of the present invention is to provide a molding method and a molding die for a color molded product.

[Means for solving the problem]

In order to achieve the above object, according to the first aspect of the present invention, a resin is sequentially injected into a cavity formed between a fixed mold and a movable mold to form a cylindrical body and formed inside the cylindrical body. In a molding method for molding a multicolor molded article comprising a plurality of molding portions, the fixed mold forms an inner peripheral surface of the cylindrical body, and the movable mold forms an outer peripheral surface of the cylindrical body. And the fixed mold includes a plurality of fixed molds, and the movable mold product surface is opposed to the product surface of the first fixed mold body of the fixed mold bodies. The cylindrical body is formed by injecting a resin into the space, and then the first fixed-side mold body is separated from the movable mold by a predetermined distance, and the product surfaces of these movable molds and the first fixed-side mold are separated. The resin is injected into the product surface of the body and the space between the cylinders to perform secondary molding in the cylinder, and then Moving the mold and mounted on a tubular body inside adhering the remaining fixed mold body sequentially to the movable mold of the fixed die member, in which each resin is injected into the space of the cylindrical body.

According to a second aspect of the present invention, a resin is sequentially injected into a cavity formed between a fixed mold and a movable mold, and a resin is formed from a cylindrical body and a plurality of molded portions formed inside the cylindrical body. A molding die for molding a multicolor molded article, wherein the fixed mold is configured to form an inner peripheral surface of the cylindrical body, and the movable mold is configured to form an outer peripheral surface of the cylindrical body. Are provided with a plurality of fixed-side molds, and a moving mechanism is provided in the movable mold to make the product surface of the movable mold face the product surface of these fixed-side molds. An operating mechanism for moving the first fixed-side mold body toward and away from the movable mold is provided in the fixed mold.

[Action]

In the method for molding a multicolor molded article and the molding die according to the present invention, the product surface of the movable mold is opposed to the product surface of the first fixed mold body, and the space formed by these product surfaces is Resin is injected to form a cylindrical body, and then the first fixed mold is separated from the movable mold by a predetermined distance, and resin is injected into a space created thereby to form a secondary in the cylindrical body. The molding is performed, and then, the movable mold is moved so that the product surface of the movable mold and the product surface of the remaining fixed mold in the fixed mold are sequentially opposed to each other. A multi-color consisting of the cylindrical body and a plurality of molded portions formed inside the cylindrical body by sequentially mounting the resin in the cylindrical body attached to the movable mold and injecting resin into the space in the cylindrical body. Mold the molded product.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an injection molding die according to an embodiment of the present invention. First, a composite lens formed by the injection molding die will be described in detail as shown in FIG. The cylindrical body 1 has a large cylindrical portion 1a and a small cylindrical portion 1b connected thereto.
And a ring-shaped receiving portion 1c formed at the tip of the small cylindrical portion 1b. The convex lens 2 has a convex lens portion 2c composed of a pair of convex curved surfaces 2a and 2b, and a convex lens portion 2c. A flange 2d provided on the outer edge of 2c and closely contacting the inner peripheral surface of the small cylindrical portion 1b and the receiving portion 1c; a flange 2d and a convex curved surface;
2a and a ring-shaped dent 2e formed therebetween. The concave lens 3 has a pair of concave curved surfaces 3.
a, 3b, and a concave lens portion 3c
The concave curved surface 3a of the concave lens 3 and the annular surface and the outer peripheral surface of the flange 3d connected thereto are formed on the upper surface of the convex lens 2 and the small cylindrical portion 1b of the cylindrical body 1, respectively. Is formed in close contact with the inner peripheral surface of the.

Next, an example of the injection molding die of the present invention for integrally molding the composite lens configured as described above will be described with reference to FIG. In FIG. 1, reference numeral 10 denotes a fixed-side mold plate. The fixed-side mold plate 10 forms the end surface of the large cylindrical portion 1a, and separates the molded product from the fixed-side mold plate away from the fixed-side mold plate 10. A stripper plate 11 to be molded is provided. The fixed mold plate 10 and the stripper plate 11 have a pair of bushes forming the inner peripheral surface of the large cylindrical portion 1a.
The fixed-side mold plate 10 is provided with a fixed-side receiving plate 13.

Opposite to the stripper plate 11, a movable mold plate 14 forming the outer surface of the cylindrical body 1 is provided so as to be close to and away from the movable mold plate 14. The movable mold plate 14 faces the bush 12. The inner peripheral surface of the receiving portion 1c and the convex curved surface 2a of the convex lens 2
And the movable side insert 15 forming the recess 2e is fitted. A passage 16 for supplying a primary injection material (resin for molding the cylindrical body 1) is formed in the movable mold plate 14.
Of the passage 16
The tip of the long nozzle of the injection molding machine comes into contact with 16a. A movable mounting plate 17 is disposed at a predetermined distance from the stripper plate 11. The movable mounting plate 17 has a drive mechanism (a hydraulic cylinder) for moving the movable mold plate 14 in the mold opening and closing direction. ) Is installed. And the tip of the drive rod 18 of this drive mechanism is
Mounted inside the movable mold plate 14, the movable mold plate 14 is in contact with the movable mounting plate 17 by the drive rod 18 of the drive mechanism, and the movable mold plate 14 is
The two bushes 12, 12 'are rotated by a rotation mechanism (not shown).
It can rotate by a predetermined angle about a center line 1 between them. Therefore, an arc-shaped groove 19 centered on the center line 1 is formed in the movable mold plate 14 for the drive rod 18. Further, a support block 20 is provided movably along the movable side mounting plate 17.

Inside the bushes 12, 12 'and the fixed-side receiving plate 13, the inner peripheral surface of the small cylindrical portion 1b and the back surface of the receiving portion 1c (the convex lens 2)
The first fixed side insert 21 which forms the convex curved surface 2b of the convex lens 2 and the second fixed surface which forms the concave curved surface 3b of the concave lens 3 and the annular surface of the flange 3d connected thereto. Side inserts 22 are fitted respectively. The fixed side inserts 21 and 22 are respectively provided with insert receiving plates 23 and 24, and these fixed side inserts 21 and 22 and the insert receiving plates 23 and
Passages 25 and 26 for supplying a secondary injection material (resin for molding the convex lens 2) and supplying a tertiary injection material (resin for molding the concave lens 3) are formed in the inside of the tube 24, respectively.
Further, the second nesting receiving plate 24 is provided with a fixed side mounting plate 27, and this fixed side mounting plate 27 and the first nesting receiving plate 24 are provided.
A predetermined interval is provided between the device and the device. And, in the fixed side mounting plate 27, the passages 25,
Facing the inlets 25a, 26a of the 26, through holes 28, 29 for inserting the nozzle of the injection molding machine are formed respectively. Further, a movable mechanism for moving the fixed side insert 21 and the insert receiving plate 23 in the mold opening and closing direction is attached to the fixed side mounting plate 27, and a tip of a movable rod 30 of the movable mechanism is It penetrates through the insert receiving plate 23 and is mounted inside the fixed insert 21.

Although not shown, when the space between each fixed side insert 21 and 22 and the insert receiving plates 23 and 24 is opened in order to remove the solidified resin of each passage 25 and 26 when the mold is opened, A well-known runner lock pin for attaching the solidified resin to the insert receiving plates 23 and 24 and a well-known runner protruding pin for pushing the attached solidified resin away from the insert receiving plates 23 and 24 are provided for each insert. Receiving plate 23,2
4 is equipped. 1 to 4, the mold opening / closing direction is shown in the vertical direction. However, in actuality, the mold opening / closing direction is horizontal and the entrance 16
This injection mold is arranged with a facing upward (upward).

When a pair of the composite lenses is formed by using the injection mold having the above-described configuration, first, as shown in FIG. When the side insert 21 is completely inserted, the entrance 16a
The cylindrical body 1 is molded by bringing the long injection nozzle of the injection molding machine into contact therewith and filling the cavity with the primary injection material through the passage 16 (see FIG. 2). In this case, no resin is supplied to the passage 25. Further, since the lower surface of the first fixed-side insert 21 and the upper surface of the movable-side insert 15 are in close contact with each other at the annular portion, the resin does not enter the space formed at the center of the two.

In this way, when the primary molding is completed and the cylindrical body 1 is molded, the first fixed side insert 21 and the first insert receiving plate 23 are fixed using the movable rod 30 of the movable mechanism. It is moved to the side mounting plate 27 side, and the first nesting receiving plate 23 is brought into contact with the fixed side mounting plate 27. In this state, the entrance 25a of the passage 25
Then, the nozzle of the injection molding machine is brought into contact through the through hole 28 of the fixed-side mounting plate 27. Next, the secondary injection material is supplied into the space between the first fixed-side insert 21, the movable-side insert 15, and the cylindrical body 1 formed by the primary molding by using the passage 25 to form a convex lens. 2 (see FIG. 3).

Next, when the secondary molding is completed and the convex lens 2 is molded, the support block 20 is moved and retracted along the movable-side mounting plate 17, and then the movable-side mold plate 14 is moved by the drive rod 18 of the drive mechanism. The movable side insert 15 is drawn together with the movable side insert 15 toward the movable side mounting plate 17. At this time, at the same time as the movable mold plate 14 moves,
Since the stripper plate 11 is separated from the fixed mold plate 10 by a predetermined distance and follows the movable mold plate 14, the already molded cylinder 1 and the convex lens 2 remain in the movable mold plate 14, and the movable mold plate 14 is removed. Move with.

When the movable mold plate 14 comes into contact with the movable mounting plate 17, the movable mechanism rotates the movable mold plate 14 by a predetermined angle about the center line 1 by the rotating mechanism, thereby moving the movable insert 15 to the second position. It is made to face the fixed side insert 22. Then, the drive rod of the drive mechanism
The movable mold plate 14 is pressed against the stripper plate 11 by 18. Subsequently, the support block 20 is interposed between the movable mold plate 14 and the movable mounting plate 17 and the entrance
With the nozzle of the injection molding machine in contact with the nozzle 26 of the injection molding machine through the through hole 29 of the fixed-side mounting plate 27, the tertiary injection material is filled with the already molded cylinder 1 and convex lens 2 using the passage 26. The space formed by the second fixed-side insert 22 is filled to form the concave lens 3 (see FIG. 4).

After the composite lens is formed in this way, the operation proceeds to the mold opening operation. That is, first, the space between each fixed side insert 21 and 22 and each insert receiving plate 23 and 24 is opened, and the solidified resin in the passages 25 and 26 is attached to each insert receiving plate 23 and 24 side. Then, the fixed side inserts 21 and 22 are pulled apart. Next, when the space between the stripper plate 11 and the movable mold plate 14 is opened, the product adheres to the inside of the movable mold plate 14. Then, the solidified resin adhered to the insert receiving plates 23 and 24 is protruded by a runner protruding pin and released from the mold, and the protruding mechanism provided in the movable side mold plate 14 causes the inside of the movable side mold plate 14 to be released. Release the product smoothly.

In the composite lens formed in this way, since the cylindrical body 1, the two lenses 2, 3 are fused and joined, there is no gap between the lenses 2, 3, and the lens performance is improved. In addition to the improvement, it is possible to completely prevent problems such as clouding at the interface between the lenses 2 and 3.

In the above-described embodiment, when the movable mold plate 14 is brought into contact with the movable mounting plate 17, it is rotated in an arc by the rotating mechanism, but linearly along the movable mounting plate 17. You may move it. In the present embodiment, the
1, a cylindrical body 1, a convex lens 2
Although the description has been given of the compound lens having the combination of the concave lens 3 and the concave lens 3, it is needless to say that three or more lenses can be overlapped by providing more fixed side inserts.

〔The invention's effect〕

As described above, according to the method for molding a multicolor molded product and the molding die of the present invention, the product surface of the movable mold is opposed to the product surface of the first fixed mold body, and A cylindrical body is formed by injecting a resin into the formed space, and then the first fixed mold body is separated from the movable mold by a predetermined distance,
Resin is injected into the space created by this, and secondary molding is performed in the cylindrical body. Subsequently, the movable mold is moved to move the product surface of the movable mold and the remaining fixed mold of the fixed mold of the fixed mold. By sequentially facing the product surface of the body, these fixed-side molds are sequentially mounted in a cylinder attached to the movable mold, and a resin is injected into each space in the cylinder, such as a compound lens. In addition to being able to manufacture molded products at low cost and easily,
Good quality products can be obtained. In addition, by sequentially mounting the fixed mold on the inner surface of the cylinder molded at the time of the primary molding, the center lines of the cylinder and the movable mold to which the cylinder is attached and the fixed mold can be easily formed. And the center of each molded part can be smoothly and surely matched with the cylindrical body of the multi-color molded product. In addition, by moving the first fixed-side mold body away from the movable mold by a predetermined distance, the movable mold and the first fixed-side mold body can perform up to secondary molding. Thus, the size of the distribution mold can be reduced.

[Brief description of the drawings]

1 to 4 show one embodiment of the present invention.
1 is a sectional view of an injection molding die, FIG. 2 is a sectional view at the time of primary molding, FIG. 3 is a sectional view at the time of secondary molding, FIG. 4 is a sectional view at the time of tertiary molding, FIG. FIG. 3 is a cross-sectional view illustrating an example of a compound lens. 1 ... cylindrical body, 2 ... convex lens, 3 ... concave lens, 10 ...
Fixed side template, 11 ... Stripper plate, 12, 12 '...
... bush, 13 ... fixed-side receiving plate, 14 ... movable-side mold plate, 15
…… Moveable side insert, 18… Drive rod (moving mechanism), 21…
... First fixed-side insert (fixed-side mold), 22... Second fixed-side insert (fixed-side mold), 30... Movable rod (operating mechanism).

Claims (2)

(57) [Claims] 1. A multi-color molded product comprising a cylindrical body and a plurality of molded portions formed inside the cylindrical body by sequentially injecting resin into a cavity formed between a fixed mold and a movable mold. In the molding method, the fixed mold is configured to form an inner peripheral surface of the cylindrical body, and the movable mold is configured to form an outer peripheral surface of the cylindrical body, respectively, and the fixed mold includes a plurality of fixed side dies. And the movable product surface is made to face the product surface of the first fixed-side mold member among these fixed-side mold members, and resin is injected into a space between these product surfaces to form the cylindrical body. Molding, and then the first fixed-side mold body is separated from the movable mold by a predetermined distance, and the product surface of these movable molds, the product surface of the first fixed-side mold body, and the space between the cylindrical body are formed. A resin is injected to perform secondary molding in the cylinder, and then the movable mold is moved to move the fixed mold body. The remaining was attached to the cylindrical body attached to the fixed mold body sequentially to the movable mold, the molding process of the multicolor molded article characterized by injecting each resin into the space of the cylindrical body. 2. A multi-color molded article comprising a cylindrical body and a plurality of molded portions formed inside the cylindrical body by sequentially injecting resin into a cavity formed between the fixed mold and the movable mold. In the molding die for molding, the fixed mold is formed so as to form the inner peripheral surface of the cylindrical body, and the movable mold is formed so as to form the outer peripheral surface of the cylindrical body, respectively. A mold is provided, and a moving mechanism is provided on the movable mold so that a product surface of the movable mold faces a product surface of the fixed mold, and a first fixed member of the plurality of fixed molds is provided. An operating mechanism for moving the side mold body toward and away from the movable mold is provided in the fixed mold.