JP6768255B2 - Molding mold - Google Patents

Description

The present invention relates to, for example, an insert molding die for manufacturing a composite part by integrating a first part and a second part by molding, and a molded product formed by the insert molding die.

Multicolor molding and insert molding are known as methods for manufacturing a composite part by integrating a plurality of parts, but Patent Document 1 describes a multicolor molding die for manufacturing a composite part by multicolor molding. As shown in FIG. 6, the one shown in FIG. 6 has been proposed.

That is, FIG. 6 is a vertical sectional view of the multicolor molding die proposed in Patent Document 1, and the multicolor molding die 101 is a secondary molding die, which is not shown by a primary molding die. With the preformed primary molded product (lens) 111 set, the cavity 106 formed around the primary molded product 111 by the fixed mold 102 and the movable mold 103 is filled with molten resin to solidify the molten resin. As a result, the composite part (product) 110 in which the primary molded product (lens) 111 and the secondary molded product (resin part) 112 around the primary molded product (lens) 111 are integrated is manufactured.

By the way, at the time of secondary molding, if the gas generated from the molten resin filled in the cavity 106 accumulates in the cavity 106, a dent is generated in the secondary molded product 112, which causes molding defects. Therefore, in the multicolor molding die 101 shown in FIG. 6, an air vent 105 for venting gas is provided between the fixed mold 102, the primary molded product 111, the secondary molded product (molten resin) 112, and the movable mold 103. , A configuration is adopted in which gas is removed from the air vent 105.

Further, for insert molding, for example, the insert molding die 201 shown in FIG. 7 is used.

That is, FIG. 7 is a vertical cross-sectional view of a conventional insert molding die, and the illustrated insert molding die 201 includes a fixed mold 202 in which the insert component 211 is loaded and an insert component 211 loaded in the fixed mold 202. It is provided with a movable type 203 that forms a cavity 206 between the two.

Thus, with the preformed insert component 211 loaded in the fixed mold 202, the molten resin is filled into the cavity 206 of the movable mold 203 from the gate 202b formed in the fixed mold 202, and the filled cavity 206 is melted. If the resin is solidified by cooling to form the resin component 212, a composite component 210 in which the resin component 212 and the insert component 211 are integrated can be obtained. According to such insert molding, the insert component 211 and the resin component 212 can be assembled at the molding stage, so that the process can be made more efficient.

Japanese Unexamined Patent Publication No. 2012-218331

However, in the case where the product surface of the movable die 203 is all the design surface like the insert molding die 201 shown in FIG. 7, degassing between the fixed die 202 and the insert component 211, the resin component 212 and the movable die 203. There is a problem that the vent cannot be formed and the resin component 212 is unavoidably defective in molding. In particular, when the insert component 211 is an optical component such as a lens and the mating surface 13 of the insert component 211 with the movable mold 203 is textured, the fixed mold 202 and the movable mold 203 are formed. It is not possible to form a vent for degassing between the two because it is necessary to bring them into close contact with each other with a strong force.

Further, since there is no mating surface with the movable mold 203 in the portion where the gate 202b of the fixed mold 202 is formed, it is impossible to form a vent for venting gas in this portion.

The present invention has been made in view of the above problems, and an object of the present invention is a molding die capable of preventing molding defects of resin parts by securing a degassing passage for secondary molding, and molding by this. The purpose is to provide molded products.

In order to achieve the above object, the invention according to claim 1 includes a fixed mold in which a first component is arranged and a movable mold in which a cavity is formed between the first component arranged in the fixed mold. With the first component arranged in the fixed mold, the molten resin filled in the movable cavity is solidified to form the second component, whereby the second component and the first component are formed. In a molding die for manufacturing an integrated composite part, a through hole for communicating the movable cavity and the atmosphere is formed in the fixed mold and the first part arranged therein, and the through hole is formed. It is characterized in that a pin is inserted into the space and the gap between the two is configured as a gas vent passage.

The invention according to claim 2 is the invention according to claim 1, wherein the gap constituting the degassing passage is set to a size that allows the passage of gas and blocks the passage of molten resin. It is a feature.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the first component is an optical component, and the through hole is formed in an optically unnecessary portion. ..

According to the invention of claim 1, since the movable cavity communicates with the atmosphere through the gas vent passage, the gas generated from the molten resin filled in the cavity during molding passes through the gas vent passage. It is not released into the atmosphere and accumulates in the cavity. Therefore, molding defects such as dents due to gas do not occur in the resin parts, and high quality is ensured for the resin parts.

According to the second aspect of the present invention, only the gas passes through the degassing passage to ensure the required degassing, and the molten resin does not flow into the degassing passage and solidify, so that the resin component is formed. High quality is ensured for the resin parts without burrs and the like.

According to the invention of claim 3, since a through hole is formed in an optically unnecessary portion of the optical component, the optical function of the optical component is not impaired by the through hole, and the optical component is expensive. Optical performance is ensured.

It is a vertical sectional view of the first part. It is a vertical sectional view which shows the state which the 1st part was loaded in the fixed mold of the molding die which concerns on this invention. It is a vertical cross-sectional view which shows the state at the time of molding the 2nd part of the molding die which concerns on this invention. It is an enlarged detailed view of part A of FIG. It is a vertical sectional view of the composite part manufactured by the molding die which concerns on this invention. It is a vertical sectional view of the multicolor molding die proposed in Patent Document 1. It is a vertical cross-sectional view of the conventional insert molding die.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical cross-sectional view of the first component, FIG. 2 is a vertical sectional view showing a state in which the first component is arranged in a fixed mold of the molding die according to the present invention, and FIG. 3 is a second component of the molding die. A vertical cross-sectional view showing a state at the time of molding, FIG. 4 is an enlarged detailed view of part A of FIG. 3, and FIG. 5 is a vertical cross-sectional view of a composite part manufactured by the molding die.

The molding die 1 according to the present embodiment manufactures the composite part 10 shown in FIG. 5 by molding, and in the present embodiment, the composite part 10 is a self-illuminating panel. The self-illuminating panel 10 is installed in the vehicle interior of a vehicle, and the transparent light guide lens 11 which is the first component and the opaque base plate 12 which is the second component are integrated by insert molding. It is configured.

The light guide lens 11, which is an optical component, is formed in an inverted dish shape by a transparent resin such as acrylic or polycarbonate having high light guide properties, and as shown in FIG. 1, a light source is not provided at the center thereof. A circular hole 11a for accommodating the illustrated LED (light emitting diode) is formed. Further, a vertical peripheral wall 11A that covers the outer periphery of the base plate 12 from the outside is integrally formed on the outer peripheral edge of the light guide lens 11.

Non-circular grooves 11b as reflection / refraction means are formed at two locations on the upper surface of FIG. 1 of the light guide lens 11, respectively. The groove 11b controls the light distribution around the groove 11b by reflection / refraction on the outer circumference thereof. The inside of the groove 11b is configured as a space having a refractive index different from that of the light guide lens 11. The optical action occurs at the interface between the light guide lens 11 and the groove 11b, and there is no optical action only inside the groove 11b. Here, the portion of the light guide lens 11 in which each groove 11b is formed (the portion of the region X in FIG. 1) is an optically unnecessary portion, and a circular hole-shaped vertical through hole 11c is formed in this portion. Is formed, and each through hole 11c is opened in each groove 11b.

Further, the base plate 12 is integrally molded into a plate shape by an opaque resin, and its outer peripheral edge is covered from the outside by the peripheral wall 11A integrally formed on the outer peripheral edge of the light guide lens 11. With this configuration, the light guide lens 11 can emit light except for a certain region of the base plate 12, which is a second component.

By the way, as shown in FIGS. 2 and 3, the insert molding die 1 according to the present embodiment includes an immovable fixed die 2 and a movable die 3 that can move up and down with respect to the fixed die 2. The fixed mold 2 is formed with a recess 2A for loading the light guide lens 11. Further, in the central portion of the fixed mold 2, a columnar protrusion 2a that fits into the circular hole 11a formed in the central portion of the light guide lens 11 is projected toward the concave portion 2A, and the protrusion 2a is formed. A gate 2b for injecting the molten resin is formed in the portion where the molten resin is injected.

Further, at two locations of the fixed mold 2, circular hole-shaped vertical through holes 2c are formed coaxially with the through holes 11c of the light guide lens 11 loaded in the recess 2A, respectively, as shown in FIG. In a state where the light guide lens 11 is loaded in the recess 2A of the fixed mold 2, each through hole 2c of the fixed mold 2 and each through hole 11c of the light guide lens 11 are formed in the light guide lens 11. They are coaxially communicated with each other via 11b.

Then, in the present embodiment, as shown in FIG. 2, when the light guide lens 11 is loaded in the recess 2A of the fixed mold 2, each of the through holes 2c of the fixed mold 2 and the light guide lens 11 communicating with each other. Cylindrical pins 4 are inserted into the through holes 11c, and each pin 4 is fixed to the fixed mold 2 by engaging the head 4a with the fixed mold 2. Here, as shown in detail in FIG. 4, the inner diameters of the two through holes 11c and 2c formed in the light guide lens 11 and the fixed mold 2 respectively are slightly smaller than the outer diameters of the pins 4 inserted through them. A large gap is set, and a minute (for example, about 0.2 mm) gap formed between each of the through holes 11c and 2c and each pin 4 constitutes a gas vent passage 5 together with the groove 11b of the light guide lens 11. ing.

Next, a manufacturing process by insert molding of the cup holder 10 as a composite part shown in FIG. 5 will be described.

When the self-illuminating panel 10 shown in FIG. 5 is manufactured by insert molding, the light guide lens 11 shown in FIG. 1 which has been molded in advance is loaded into the recess 2A of the fixed mold 2 as shown in FIG. When the movable mold 3 is moved upward from this state and aligned with the fixed mold 2 as shown in FIG. 2, the cavity 6 along the outer shape of the base plate 12 (see FIG. 3), which is a resin component, becomes a light guide lens. It is formed by 11 and the movable mold 3. In this case, one end (lower end of FIG. 2) of each through hole 11c formed in the light guide lens 11 is opened in the cavity 6, and one end (upper end of FIG. 2) of each through hole 2c formed in the fixed mold 2 is open. It is open to the atmosphere. Therefore, the cavity 6 communicates with the atmosphere through the degassing passage 5.

Next, from the state shown in FIG. 2, the molten resin is filled into the cavity 6 from the gate 2b formed in the fixed mold 2 as shown in FIG. 3, and the filled molten resin is cooled and solidified. The light guide lens 11 and the base plate 12 are coupled and integrated to manufacture the self-illuminating panel 10 shown in FIG. Here, since the cavity 6 of the movable mold 3 communicates with the atmosphere through the gas vent passage 5, the gas generated from the molten resin filled in the cavity 6 at the time of insert molding passes through the gas vent passage 5. It is not released into the atmosphere and accumulated in the cavity 6. Therefore, molding defects such as dents due to gas do not occur in the base plate 12 which is a resin component, and high quality is ensured in the base plate 12.

Further, in the present embodiment, the gap between the through holes 2c and 11c constituting the gas vent passage 5 and the pin 4 is set to a size that allows the passage of gas and blocks the passage of the molten resin. Therefore, only the gas passes through the degassing passage 5 to ensure the required degassing, and the molten resin does not flow into the degassing passage 5 and solidify, so that burrs and the like are generated on the base plate 12. High quality is ensured in the base member 12 without any trouble.

Further, in the present embodiment, since the through hole 11c is formed in the optically unnecessary portion (the portion of the region X in FIG. 1) of the light guide lens 11 which is an optical component, the light guide lens 11 is formed by the through hole 11c. High optical performance is ensured for the light guide lens 11 without impairing the optical function. In the self-illuminating panel 10 shown in FIG. 5, light from an LED (not shown) travels inside the light guide lens 11, and this light is finally emitted from the end surface of the peripheral wall 11A of the light guide lens 11. The outer peripheral edge of the base plate 12 shines brightly, and the position of the self-illuminating panel 10 can be visually recognized by the occupant even at night.

In the above embodiment, the insert molding die when the composite part is an in-vehicle self-illuminating panel has been described, but the molding die according to the present invention is a two-color molding die in addition to the insert molding die. Of course, it can be applied to molds, and it can be applied to those for manufacturing any other composite parts as well.

1 Insert molding mold 2 Fixed mold 2A Fixed mold recess 2a Fixed mold protrusion 2b Fixed mold gate 2c Fixed type through hole 3 Movable 4 pin 4a Pin head 5 Degassing passage 6 Cavity 10 Self-illuminating panel ( Composite parts)
11 Light guide lens (first part)
11A Peripheral wall of the light guide lens 11a Circular hole of the light guide lens 11b Groove of the light guide lens 11c Through hole of the light guide lens 12 Base plate (second part)
13 Alignment surface (textured surface)
X Optically unnecessary area of the light guide lens

Claims (3)

A movable mold that forms a cavity between a fixed mold in which the first component is arranged and the first component arranged in the fixed mold is provided, and the first component is arranged in the fixed mold. In a molding die for manufacturing a composite part in which the second part and the first part are integrated by solidifying the molten resin filled in the movable cavity and molding the second part.
A through hole for communicating the movable cavity and the atmosphere is formed in the fixed mold and the first component arranged therein, a pin is inserted through the through hole, and a gap between the two is used as a gas vent passage. A molding die characterized by being constructed. The molding die according to claim 1, wherein the gap constituting the gas vent passage is set to a size that allows the passage of gas and blocks the passage of molten resin. The molding die according to claim 1 or 2, wherein the first component is an optical component, wherein the through hole is formed in an optically unnecessary portion.

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