JP2727722B2 - 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, a first aspect of the present invention is a method for molding a multicolor molded article, which comprises sequentially injecting and molding a resin into a cavity formed between a fixed mold and a movable mold.
A plurality of fixed side molds are sequentially fitted to and removed from the fixed mold,
The resin is injected into a space formed between the product surface of each of the fixed molds and the product surface of the movable mold.

According to a second aspect of the present invention, there is provided a mold for forming a multicolor molded product, in which a resin is sequentially injected into a cavity formed between a fixed mold and a movable mold to form the molded article. A plurality of fixed-side molds are provided in the through holes so as to be freely detachable, and an exchange mechanism for exchanging each of the fixed-side molds fitted in the fixed-type through-holes is provided.

[Action]

In the method for molding a multicolor molded article and the molding die according to the present invention, the plurality of fixed-side molds fitted into the fixed mold are sequentially exchanged, and the product surface of these fixed-side molds and the movable mold are changed. A resin is injected into each of the spaces formed with the product surface to form a multicolor 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 mold plate. The fixed mold plate 10 forms an end surface of the large cylindrical portion 1a and separates the molded product from the fixed mold plate 10 at the time of release. A stripper plate 11 to be molded is provided. A bush 12 forming the inner peripheral surface of the large cylindrical portion 1a is fitted into the fixed-side template 10 and the stripper plate 11, and the fixed-side template 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. In the movable mold plate 14, a passage 16 for supplying a primary injection material (resin for molding the cylinder 1) is formed up to the side surface of the movable mold plate 14, and an entrance 16 of the passage 16 is formed.
The tip of the nozzle of the injection molding machine comes into contact with a. The movable mold plate 14 is provided with a movable receiving plate 17, and a movable mounting plate 18 is attached to the movable receiving plate 17.

Inside the bush 12 and the fixed-side receiving plate 13, a small cylinder
Inner peripheral surface of 1b, back surface of receiving portion 1c (collar portion 2d of convex lens 2)
The first fixed side insert 19 forming the convex curved surface 2b of the convex lens 2 and the second fixed side insert 20 forming the concave curved surface 3b of the concave lens 3 and the annular surface of the flange 3d connected thereto. Are configured so that they can be alternately fitted. The bush 12 and the fixed side receiving plate 13 are separated from each other by a predetermined distance.
In the three places, the fixed side receiving plate 13, the fixed side template 10, the stripper plate 11, the movable side template 14, and the movable side receiving plate 17 are penetrated, and A hole 21 (the evacuation hole 21 for the first fixed-side insert 19 is not shown in FIG. 1) is formed. Also, each fixed side insert
Insertion receiving plates 22 and 23 are attached to 19 and 20, respectively. Inside these fixed-side inserts 19 and 20 and the receiving plates 22 and 23, respectively, the secondary injection material ( Conveyor lens 2 molding resin) supply and tertiary injection material (concave lens 3 molding resin)
Supply passages 24 and 25 are respectively formed. A fixed-side mounting plate 26 is disposed at a predetermined distance from the fixed-side receiving plate 13, and the fixed-side mounting plate 26 has a passage 24, 25 for each of the nesting receiving plates 22, 23. Opposite to the inlet portions (nozzle touch portions) 24a, 25a, through holes 27, 28 for inserting a long nozzle of the injection molding machine are formed, respectively. Further, the fixed side inserts 19, 2
0, an operating mechanism (hydraulic cylinder) for moving the insert receiving plates 22 and 23 in the mold opening and closing direction is attached, and the distal ends of the operating rods 29 and 30 of the operating mechanism are attached to the insert receiving plates 22 and 23, respectively. , 23 are mounted inside the respective fixed-side inserts 19, 20. Then, in a state where the fixed side inserts 19, 20 and the insert receiving plates 22, 23 are in contact with the fixed side mounting plate 26 by the operating rods 29, 30 of the operating mechanism, each fixed side insert 19 , 20 and the nesting receiving plates 22, 23 are rotated by a predetermined angle around the center lines l, m of the entrances 24a, 25a of the passages 24, 25 by a rotating mechanism (not shown). Has become. Accordingly, in the fixed side inserts 19, 20 and the insert receiving plates 22, 23, arc-shaped grooves 31, 32 centered on the center lines l, m for the operating rods 29, 30 are formed. 33 and 34 are formed. Further, a support block 35 is movably provided along the fixed side mounting plate 26, and the first fixed side insert 19 is completely inserted into the bush 12 so that the first set A predetermined gap is formed between the child receiving plate 22 and the support block 35.

Although not shown, when the space between each fixed side insert 19, 20 and the insert receiving plates 22, 23 is opened to remove the solidified resin of each passage 24, 25 when the mold is opened, A well-known runner lock pin for adhering the solidified resin to the nesting receiving plates 22 and 23 and a well-known runner protruding pin for pushing the adhered solidified resin away from the nesting receiving plates 22 and 23 include each nesting pin. Receiving plate 2
Not equipped on 2,23. Also, in FIGS. 1 to 4, the mold opening / closing direction is shown in the vertical direction.
Actually, this injection molding die is arranged such that the opening and closing direction of the die is horizontal and the entrance 16a of the passage 16 is directed to the top side (upward).

In the case of integrally molding the compound lens using the injection mold having the above-described configuration, first, as shown in FIG. In the state where the side insert 19 is completely fitted, the entrance portion 16a
The cylinder 1 is molded by contacting the nozzle of the injection molding machine with the nozzle 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 24. Further, since the lower surface of the first fixed-side insert 19 and the upper surface of the movable-side insert 15 are in close contact at the annular portion,
The resin does not penetrate into the central space formed by the two.

In this way, when the primary molding is completed and the cylindrical body 1 is molded, the first fixed side insert 19 and the first insert receiving plate 22 are fixed using the operating rod 29 of the operating mechanism. It is moved to the side mounting plate 26 side, and the first nesting receiving plate 22 is brought into contact with the support block 35. In this state, the entrance 24a of the passage 24
Then, the long nozzle of the injection molding machine is brought into contact through the through hole 27 of the fixed-side mounting plate 26. Next, using the above-described passage 24, the secondary injection material is supplied with the first fixed side insert 19 and the movable side insert 19.
The convex lens 2 is formed by supplying it into the space between the cylindrical body 1 and the cylindrical body 1 formed by primary molding (see FIG. 3).

Next, when the secondary molding is completed and the convex lens 2 is molded, the support block 35 is moved and retracted along the fixed-side mounting plate 26, and then the first insertion member is moved by the operation rod 29 of the operation mechanism. The receiving plate 22 and the first fixed side insert 19 are fixed to the fixed side mounting plate 26.
Side, and pull out the first fixed side insert 19 from the bush 12 and the fixed side receiving plate 13. Then, by the rotation mechanism,
The first fixed side insert 19 and the first insert receiving plate 22 are positioned at the center line l.
After rotating a predetermined angle around the
29, a first fixed side insert 19 and a first insert receiving plate 22 are provided.
Is pushed out to the fixed-side receiving plate 13 side, and the first fixed-side insert 19 is inserted into the evacuation hole (not shown). In this case, the long nozzle of the injection molding machine for the secondary injection material is retracted to the fixed side mounting plate 26 side.

On the other hand, the operating rod 30 pulls the second fixed side insert 20 and the second insert receiving plate 23 toward the fixed side mounting plate 26 side,
After pulling out the second fixed side insert 20 from the evacuation hole 21,
The second fixed side insert 20 and the second insert receiving plate 23 are rotated by a predetermined angle about the center line m by a rotation mechanism, and the second fixed side insert is rotated by the operating rod 30. 20 and the second insert receiving plate 23 are pushed out to the fixed receiving plate 13 side, and the second fixed insert 20 is inserted into the bush 12. Then
After the support block 35 is interposed between the second nest receiving plate 23 and the fixed-side mounting plate 26, the inlet 25a of the passage 25 passes through the through hole 28 of the fixed-side mounting plate 26, and Contact the long nozzle. Subsequently, using the passage 25, the tertiary injection material is mixed with the already molded cylinder 1 and the convex lens 2 and the second injection material.
The space formed by the fixed side insert 20 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, a state in which the space between the fixed side inserts 19 and 20 and the insert receiving plates 22 and 23 is opened, and the solidified resin in the passages 24 and 25 is adhered to the insert receiving plates 22 and 23 side. Then, the fixed side inserts 19 and 20 are separated. Next, when the space between the stripper plate 11 and the movable mold plate 14 is opened, the product is attached to the fixed mold side. Then, the solidified resin attached to the insert receiving plates 22 and 23 is protruded by a runner protruding pin and released from the mold, and the stripper plate 11 is moved to the movable mold plate 14.
By moving the product to the side by a predetermined distance, the product adhering to the fixed mold side is released 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 embodiment, when the fixed side inserts 19 and 20 and the insert receiving plates 22 and 23 are brought into contact with the fixed side mounting plate 26 side, they are rotated in an arc by the rotation mechanism. However, it may be moved linearly along the fixed side mounting plate 26. Further, in this embodiment, the composite lens in which the cylindrical body 1 is combined with the convex lens 2 and the concave lens 3 by the first and second fixed side inserts 19 and 20 has been described, but more fixed side inserts are provided. Thus, it is needless to say that three or more lenses can be superimposed.

〔The invention's effect〕

As described above, according to the method for molding a multicolor molded article and the molding die of the present invention, a plurality of fixed-side molds that are fitted into the fixed mold are sequentially replaced, and these fixed-side molds are replaced. By injecting resin into each space formed by the product surface and the product surface of the movable mold, it is possible to manufacture molded products such as compound lenses at low cost and easily, and to obtain good quality products. Can be.

[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. 10 …… Fixed side template, 11 …… Stripper plate, 12…
... bush, 13 ... fixed-side receiving plate, 14 ... movable-side mold plate, 15
... movable side insert, 19 ... first fixed side insert (fixed side body), 20 ... second fixed side insert (fixed side body), 29, 30
...... Actuating rod (exchange mechanism).

Claims (2)

(57) [Claims] 1. A method of molding a multicolor molded product by sequentially injecting resin into a cavity formed between a fixed mold and a movable mold to form a plurality of fixed molds in the fixed mold. A method for molding a multicolor molded article, wherein the resin is injected into a space formed between a product surface of each of the fixed mold bodies and a product surface of the movable mold. 2. A molding die for a multicolor molded product, which is formed by sequentially injecting resin into a cavity formed between a fixed die and a movable die, wherein a plurality of through holes are formed in the fixed die. Wherein the fixed-side mold body is provided so as to be detachable, and an exchange mechanism for exchanging each of the fixed-side mold bodies fitted into the through holes of the fixed mold is provided. Mold.