JP3468581B2 - Synthetic resin molding 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 synthetic resin molding device for injecting a synthetic resin liquid into a hollow portion and curing it to produce a synthetic resin molded product having a predetermined shape.

[0002]

2. Description of the Related Art Generally, when a synthetic resin plate, an electrical component, a synthetic resin molded product such as a plastic model, is manufactured, it is heated to a predetermined temperature or a synthetic resin liquid which is polymerized and cured by irradiation with light. A state in which a synthetic resin liquid that is polymerized and hardened by is injected from one of the hollow mold parts formed by the upper mold and the lower mold and the other of the hollow mold parts is released to the atmosphere,
Alternatively, when the hollow space is filled with the synthetic resin liquid under a negative pressure, the synthetic resin liquid filled in the hollow mold portion is irradiated with light, or the synthetic resin liquid is cured by heating to a predetermined temperature. 2. Description of the Related Art A synthetic resin molding device having a structure in which an upper mold and a lower mold are separated and a synthetic resin molded product is taken out is used.

An operator manually removes a product from the above-mentioned synthetic resin molding apparatus.

[0004]

In the method of manually removing the synthetic resin molded product cured in the hollow mold part as described above by the operator, when the synthetic resin molded product is taken out from the mold part, the pouring spout is used. There is a problem that the cured resin in the holes remains on the mold side and a part of the synthetic resin molded product is broken.

An object of the present invention is to solve the above problems and to provide a synthetic resin molding device which can easily take out a synthetic resin molded product from a mold part.

[0006]

In order to solve the above-mentioned problems, a synthetic resin molding apparatus of the present invention comprises a spout hole for injecting a synthetic resin liquid, which is made to communicate with the hollow mold part in an upper mold or a lower mold,
A synthetic resin liquid supply hole, a compressed air supply hole, and a drain discharge hole are provided, and passage switching valve means is provided at the intersection of the holes.

Further, in the synthetic resin molding device of the present invention, a spout hole for injecting a synthetic resin liquid and a synthetic resin liquid supply hole which are communicated with one end of the hollow mold portion in the upper die or the lower die as claimed in claim 2. And a compressed air supply hole and a drain discharge hole,
A first valve means for switching the passage is provided at the intersection of the holes, and a negative pressure hole, a compressed air supply hole, and a drain discharge hole which are communicated with the other end of the hollow mold portion are formed. A second valve means for switching the passage is provided at the intersection of the holes.

[0008]

The synthetic resin liquid is supplied to the pouring spout hole through the valve means, and when the supply of the synthetic resin liquid is stopped, the synthetic resin liquid in the valve means is sent out from the drain discharge hole to form a synthetic resin molded product. At the time of taking out, the compressed air is supplied to the sprue hole for injection through the valve means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the construction of a synthetic resin molding apparatus according to the present invention
1 is a schematic cross-sectional view showing an embodiment, FIG. 2 is a view taken along the line II of FIG. 1, FIG. 3 is a view taken along the line II-II of FIG. 1, and FIG. 4 is a view taken along the line III-III of FIG. The synthetic resin molding device includes a lower mold 1 attached to a machine frame (not shown).
And an upper mold 2 provided so as to come into contact with and separate from the lower mold 1.

The lower mold 1 described above has a base member 3 mounted horizontally on a machine frame (not shown), and a pattern plate 4 mounted on a recess 3a formed in the base member 3 with a screw 5. A first valve means 6 for liquid supply mounted on the base member 3 so as to be located at one end side of the pattern plate 4, and mounted on the base member 3 so as to be located at the other end side of the pattern plate 4. It is constituted by the second valve means 7 for negative pressure.

A recess 3a is provided on the upper surface of the base member 3 for mounting the pattern plate 4, and a hole 3b for mounting the first valve means 6 is provided on one side surface of the base member 3. A hole 3c for mounting the second valve means 7 is provided on the other side surface portion, and a synthetic resin liquid supply hole 3d, a drain hole 3e, and a compressed air supply hole 3f are provided on the bottom surface portion on the hole 3b side. A suction hole 3g, a drain hole 3h, and a compressed air supply hole 3j are formed on the bottom surface on the hole 3c side.

The bottoms of the holes 3b and 3c are formed into conical holes 3b 'and 3c' for the valve seat, and the conical holes 3b 'are formed.
The above-mentioned synthetic resin liquid supply hole 3d, drain hole 3e,
The compressed air supply hole 3f is connected to the conical hole 3c ', and the suction hole 3g, the drain hole 3h, and the compressed air supply hole 3j are connected to each other.

Further, a sprue hole 3k is formed on the upper die side of the conical hole 3b 'of the base member 3, and a negative pressure hole 3m is formed on the upper die side of the conical hole 3c' so that they communicate with each other. Has been done.

One end of the concave portion 3a for mounting the pattern plate formed on the base member 3 and the sprue hole 3k are connected by a pouring portion 3n which is fan-shaped in the horizontal direction and is inclined in the vertical direction. The other end of the recess 3a and the negative pressure hole 3m are connected to each other by an outflow portion 3p formed so as to fan out in the horizontal direction and incline in the vertical direction.

It is preferable that the sprue hole 3k and the negative pressure hole 3m are provided with a draft so that the hardened synthetic resin can be easily separated.

The above-mentioned pattern plate 4 is provided with a concave portion 4a forming a mold portion so as to communicate with the injection portion 3n and the outflow portion 3p formed in the base member 3. The pattern plate 4 is replaced depending on the shape of the synthetic resin molded product.

The above-mentioned first valve means 6 has a valve body 8 fitted in a hole 3b formed in a side portion of the base member 3, and the valve body 8
It is composed of a plurality of disc springs 9 that press the conical valve portion 8a against the conical hole 3b ', and a retainer 10 that presses the disc springs 9.

A passage hole 8b is formed in the valve portion 8a, and a flange 11 is integrally attached to an end portion of a shaft portion 8c to rotate the valve body 8 by a predetermined angle. (Not shown) are connected. Then, when the valve body 8 is rotated by the rotation drive device (not shown), the valve portion 8
The synthetic resin liquid supply hole 3d and the sprue hole 3 are formed by the hole 8b of a.
k is the hole 8b and the drain hole 3e, and the hole 8b allows the compressed air supply hole 3f and the sprue hole 3k to communicate with each other in this order.

The above-mentioned second valve means 7 also has the same structure as the first valve means 6, and the valve body 12 fitted in the hole 3c formed in the side portion of the base member 3 and the valve body 12 are inserted. 12 conical valve parts 1
Plural disc springs 13 for pressing 2a against the conical hole 3c '
And a retainer 14 for pressing the disc spring 13.

A passage hole 12b is formed in the valve portion 12a, and a flange 15 is integrally attached to the shaft portion 12c to rotate the valve body 12 by a predetermined angle (not shown). No) is connected. Then, when the valve body 12 is rotated by the rotary drive device (not shown), the hole 12b of the valve portion 12a causes the suction hole 3g and the negative pressure hole 3m.
However, the hole 8b and the drain hole 3h, and the compressed air supply hole 3j and the negative pressure hole 3m are sequentially connected by the hole 8b in this order.

The above-mentioned upper mold 2 has a frame body 16 rotatably attached to a machine frame (not shown), and a retainer 1 for the frame body 16.
Transparent glass 17 attached by 8 and a base material 19 for peeling attached along the lower surfaces of the frame 16 and the transparent glass 17 by the suction force acting on the negative pressure holes 16a provided in the frame 16. It is composed by.

As the base material 19, a transparent plate of acrylic resin, polyester resin or the like, a transparent film or the like can be used, and it can also be attached to the frame body 16 by an adhesive, a holding frame or the like.

A synthetic resin liquid supply pipe (not shown) having an electromagnetic switching valve, a liquid feed pump, etc. is provided in the synthetic resin liquid supply hole 3d, and the synthetic resin liquid is discharged into the drain holes 3e, 3h. A suction pipe (not shown) has an electromagnetic switching valve in the suction hole 3g, and a suction pipe (not shown) whose end is connected to a vacuum pump or the like is provided in the compressed air supply holes 3f, 3j. A compressed air supply pipe (not shown) having an electromagnetic switching valve and an end connected to a compressor or the like is connected to each.

The above-mentioned switching operation of each electromagnetic switching valve, rotation operation of the valve element, opening / closing operation of the upper die, etc. are manually performed by an operator,
Automatically based on a signal from a control device such as a microcomputer.

In the above-mentioned synthetic resin molding apparatus, the joining surface of the lower die 1 and the upper die is located in the horizontal direction, but the joining surface may be located in the vertical direction.

When the synthetic resin liquid is polymerized and cured by heating, an electric heating element such as a sheath heater is attached to at least one of the lower mold 1 and the upper mold 2, or a heating medium such as heating oil or heating steam is used. A jacket room for supply is provided.

In the above-mentioned synthetic resin molding apparatus, the lower mold 1 is provided with the pattern plate 4, but the pattern plate 4 is provided in the upper mold 2, or both the upper mold 2 and the lower mold 1. You can also

Further, the hollow mold part formed by the base material 19 of the upper mold 2 and the concave portion 4a of the pattern plate 4 of the lower mold 1 is put in a negative pressure state and is filled with the synthetic resin liquid without forming voids. However, it is also possible to form a hole communicating with the atmosphere in the outflow portion 3p of the upper mold 2 so that when the synthetic resin liquid is supplied, the air in the hollow mold portion is discharged from the hole.

According to the synthetic resin molding apparatus of the present invention, when the supply of the synthetic resin liquid is stopped, the synthetic resin liquid in the hole 8b of the valve body 8 and the hole 12b of the valve body 12 is delivered from the drain holes 3e, 3h. Therefore, the synthetic resin liquid does not harden in the holes 8b and 12b.

When the cured synthetic resin molded product is taken out, a pressing force acts on the synthetic resin-cured member in the gate hole 3k and the negative pressure hole 3m by the compressed air supplied to the gate hole 3k and the negative pressure hole 3m. Therefore, the synthetic resin molded product can be taken out without damage.

[0031]

According to the synthetic resin molding apparatus of the present invention, there is provided a spout hole for injecting a synthetic resin liquid, which is communicated with the hollow mold portion in the upper mold or the lower mold, a synthetic resin liquid supply hole, and a compressed air supply hole. ,
Since the drain discharge hole is formed and the passage switching valve means is provided at the intersection of the holes, the synthetic resin liquid is supplied to the injection portion by the valve body, and the synthetic resin liquid When the supply is stopped, the synthetic resin liquid in the hole of the valve means is sent out from the drain discharge hole, and when the synthetic resin molded product is taken out, compressed air can be supplied to the sprue hole by the hole of the valve means,
The synthetic resin molded product can be reliably taken out from the mold part, and when the synthetic resin liquid is supplied, the synthetic resin liquid is discharged from the hole of the valve means, so that the synthetic resin liquid is hardened in the hole of the valve means. Can be prevented.

Further, in the synthetic resin molding apparatus of the present invention, a spout hole for injecting a synthetic resin solution and a hole for supplying a synthetic resin solution, which are communicated with one end of the hollow mold part in the upper mold or the lower mold as in claim 2, are provided. And a compressed air supply hole and a drain discharge hole,
A first valve means for switching the passage is provided at the intersection of the holes, and a negative pressure hole, a compressed air supply hole, and a drain discharge hole which are communicated with the other end of the hollow mold portion are formed. Since the second valve means for switching the passage is provided at the intersection of the holes, the synthetic resin liquid is supplied to the injection part by the valve body, and when the supply of the synthetic resin liquid is stopped, the inside of the hole of the valve means is stopped. The synthetic resin liquid of is sent out from the drain discharge hole, and when the synthetic resin molded product is taken out, the compressed air is blown by the hole of the valve means,
The synthetic resin liquid can be supplied to the negative pressure hole and the synthetic resin molded product can be reliably taken out from the mold part. When the synthetic resin liquid has been supplied, the synthetic resin liquid in the hole of the valve means is discharged to the drain discharge hole. Therefore, it is possible to prevent the synthetic resin liquid from hardening in the hole of the valve means.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the configuration of a synthetic resin molding device of the present invention.

FIG. 2 is a view on arrow I-I in FIG.

FIG. 3 is a view on arrow II-II in FIG.

FIG. 4 is a view on arrow III-III in FIG.

[Explanation of symbols]

1 Lower mold 2 Upper mold 3 Base member 4 pattern plates 5 screw body 6 First valve means 7 Second valve means 8, 12 valve body 9, 13 Disc spring 10, 14, 18 Presser foot 11, 15 flange 16 frame 17 Transparent glass 19 Base material 3a recess 3b, 3c, 8b, 12b holes 3d synthetic resin liquid supply hole 3e, 3h Drain hole 3f, 3j Air pressure supply hole 3g suction hole 3k spout hole 3m negative pressure hole 3n injection part 3p outflow section 3b ', 3c' conical holes 8a, 12a valve part 8c, 12c shaft

Claims (2)

(57) [Claims] 1. An apparatus for injecting a synthetic resin liquid into a hollow mold part formed by an upper mold and a lower mold to mold a synthetic resin molded product having a predetermined shape, wherein the hollow mold part is formed on the upper mold or the lower mold. A synthetic resin solution injection hole, a synthetic resin solution supply hole, a compressed air supply hole, and a drain discharge hole, which are communicated with each other, are formed, and a passage switching valve means is provided at the intersection of the holes. A synthetic resin molding device characterized by being provided. 2. A predetermined shape for injecting a synthetic resin liquid from one of the hollow mold parts formed by an upper mold and a lower mold and sucking the synthetic resin liquid from the other of the hollow mold parts to fill the hollow mold part with the synthetic resin liquid. In the apparatus for molding the product, a spout hole for injecting a synthetic resin solution, a synthetic resin solution supply hole, a compressed air supply hole, and a drain discharge hole, which communicate with one end of the hollow mold part in the upper mold or the lower mold. And a first valve means for switching the passage at the intersection of the holes, and a negative pressure hole, a compressed air supply hole, and a drain discharge hole that communicate with the other end of the hollow mold part. And a second valve means for switching the passage is provided at the intersection of the holes, the synthetic resin molding device.