JPH0939018A - Foamed resin molding machine and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the contact of the cavity surface of an upper mold with that of a lower mold when the upper mold is opened. SOLUTION: A moving base 70 is raised by driving a cylinder to raise an upper mold 90 and a piston rod 84 is extended by driving a cylinder 80 to revolve the upper mold 90 to open the same. Since the upper mold 90 is opened after raised, the contact of the cavity surface of the upper mold 90 with the cavity surface (protruding part) of a lower mold 50 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to foaming for cooling a cavity formed between an upper mold and a lower mold with water from inside the mold and discharging cooling water accumulated inside the upper mold and the lower mold. The present invention relates to a resin molding machine and a foamed resin molding method.

[0002]

2. Description of the Related Art Conventionally, foaming resin molding has been carried out in the following steps using a foaming resin molding machine shown in FIG. In the case of insert molding of metal fittings, etc., FIG.
As shown in (b), the positioning pin 120 inserted in the male mold 100 is inserted through the metal fitting 110 to perform the operation. First,
The male mold 100 is horizontally moved toward the female mold 200 by operating the mold opening / closing cylinder 300 to perform mold clamping. Subsequently, a cavity 360 formed on the mating surface of the male mold 100 and the female mold 200 is filled with a foamed resin molding material (beads) 310. Subsequently, heated steam flows into the male mold 100 and the female mold 200 from the inflow pipe 330 to heat the mating surface, thereby melting the foamed resin molding raw material 310 in the cavity 360. Subsequently, cooling water is introduced from the inflow pipe 330 to supply the male mold 100 and the female mold 2.
The above-mentioned mating surface is cooled by jetting from a plurality of jet nozzles 350 formed inside the inside of the nozzle. Next, the male mold 100 is moved horizontally by operating the mold opening / closing cylinder 300 to open the mold. Subsequently, the ejector 320 is moved so that the ejector pin 370 protrudes from the inside of the female mold 200 into the cavity 360, and the cavity 36
The mold for the foamed resin molded product solidified within 0 is released.

However, when the male mold 100 is moved and the mold is clamped, there is a problem that the positioning pin 120 comes off due to the vibration during the movement and the metal fitting 110 is easily dropped. In order to increase the positioning accuracy of the metal fitting 110, as shown in FIG.
However, during repetition of molding, there is a problem in that the magnetic force is weakened due to conduction of heat during molding and the metal fitting 110 cannot be accurately positioned. Therefore, as shown in FIG.
00 and the female mold (lower mold) 200 are in a horizontal posture, and the male mold 100 is manually rotated in the direction of the arrow about the fulcrum 400 to open, thereby preventing the fitting 110 from dropping and displacing. Is used.

[0004]

The above-mentioned male mold 1
00 is rotated to open the corners 1 of the male mold 100.
As shown in FIG. 9, the male mold 100 and the female mold 20 do not come into contact with the inner wall surface 210 of the female mold 200.
0, the gap L1 is formed between the contact surfaces of the male mold 100 and the female mold 200 when the male mold 100 and the female mold 200 are joined.
It is necessary that the corner 140 of 00 is removed.
Here, as a result of casting the male mold 100 and the female mold 200 according to the shape of the foamed resin molded product to be manufactured,
When the length L2 of the gap L1 in the up-down direction is increased, the radius drawn by the corner 140 of the male mold 100 becomes large, so that it is necessary to further widen the gap L1.

[0005] However, since it is necessary to maintain airtightness in the cavity so that the foamed resin molding material filled in the cavity does not leak, the gap L1 is limited (for example, L1 = 0. 2mm to 0.5m
m). Therefore, in the conventional case, the male mold 10 is used.
There is a problem that the shapes of the 0 and the female mold 200 are limited. That is, there is a problem that the shape and size of the foamed resin molded product to be manufactured are limited. Means for lifting the upper mold 100 upward to take out the foamed resin molded product is also conceivable, but since the cooling water accumulated in the internal space 101 of the upper mold 100 cannot be completely drained,
The residual water impedes the filling of the foamed resin molding material, or causes uneven heating, resulting in poor fusion of the foamed resin molding material.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to limit the shape and size of a foamed resin molded product to be manufactured. An object of the present invention is to provide a foamed resin molding machine and a foamed resin molding method.

[0007]

According to the present invention, in order to achieve the above-mentioned object, according to the first aspect of the present invention, a foamed resin molding material is filled in a cavity formed on a mating surface of an upper mold and a lower mold. Then, the two molds are heated to fuse the foamed resin molding material in the cavity, and the mating surfaces of the two molds are each water-cooled from the inside of the mold, and foaming is performed to release the foamed resin molded body in the cavity. In a resin molding machine, the upper mold and the lower mold are separated from each other by a predetermined distance between mating surfaces, and one of the upper mold and the lower mold is centered on one end of the upper mold and the lower mold. Technical means that mold opening means for rotating in the direction away from the mold is provided.

[0008] According to the invention described in claim 2, in the foamed resin molding machine according to claim 1, the mold opening means is configured such that the upper mold and the lower mold are separated from each other by a predetermined distance between their mating surfaces. In addition, a technical means is adopted in which the upper mold is rotated about one end thereof in a direction away from the lower mold.

According to a third aspect of the present invention, in the foamed resin molding machine according to the first aspect, the mold opening means raises the upper mold from the lower mold to a predetermined height and raises the upper mold. With the upper mold around its one end,
A technical means of rotating in a direction away from the lower mold is adopted.

According to a fourth aspect of the present invention, in the foamed resin molding machine according to the third aspect, the mold opening means is provided below the lower mold and is supported so as to be able to move up and down. Technical means is adopted in which a moving base, elevating means for moving the moving base up and down, and rotating means attached to the moving base and rotatably supporting the upper die are provided. .

According to the fifth aspect of the present invention, a foamed resin molding material is filled in a cavity formed on a mating surface of an upper mold and a lower mold, and the molds are heated to heat the foamed resin molding material in the cavity. In a foamed resin molding method of water-cooling the mating surfaces of the two molds from the inside of the mold and releasing the foamed resin molded body in the cavity, the water-cooled upper mold and lower mold are joined together. A technique of providing a state in which a predetermined distance is maintained between the surfaces and rotating one of the upper mold and the lower mold in a direction away from the other mold about one end thereof. Employ strategic means.

[0012]

According to the first to fifth aspects of the present invention, the upper mold and the lower mold are separated from each other by a predetermined distance between the mating surfaces, and one of the upper mold and the lower mold is moved to the other. With one end as the center, it can be rotated in the direction away from the other mold, such as the one that rotates the upper mold and the lower mold without placing a predetermined distance between the mating surfaces, The protrusion of one of the upper mold and the lower mold can be prevented from contacting the inner wall surface of the other mold. That is, the upper and lower dies do not become unrotatable due to the shapes of the upper and lower dies, and thus the shape and size of the foamed resin molded product to be manufactured are not limited.

[0013] In particular, in the invention according to claim 4, the upper die is attached to the movable base supported by the elevating means so as to be movable up and down. Can be raised and lowered. Since the upper mold is attached to the rotating means for rotating the upper mold on the moving base, the upper mold can be rotated by the rotating means. That is, the upper die can be opened by rotating from the raised state.

According to the fifth aspect of the present invention, the water-cooled upper mold and the lower mold are separated from each other by a predetermined distance between their mating surfaces, and one of the upper mold and the lower mold is formed. Is rotated about its one end in a direction away from the other mold, so that the upper mold and the lower mold are rotated without placing a predetermined distance between their mating surfaces. Like the one, it is possible to prevent the protrusion of one of the upper mold and the lower mold from coming into contact with the inner wall surface of the other mold. That is, since the mold does not become unrotatable due to the shapes of the upper mold and the lower mold, the foamed resin molded product is manufactured without being limited by the shape and size of the foamed resin molded product to be manufactured. be able to.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings. First, the structure of the foamed resin molding machine of the present invention will be described with reference to FIGS. 1 is an explanatory right side view showing the configuration of the foamed resin molding machine, FIG. 2 is a front elevational view of the foamed resin molding machine shown in FIG. 1, and FIG. 3 is a foamed resin molding machine shown in FIG. It is a plane explanatory view of a machine. In the present embodiment, a drain pan that receives drain water, such as an air conditioner and a cooler, will be described as a representative example of a foamed resin molded product to be manufactured.

The foaming resin molding machine 10 includes a flat base 20 for installation, a lower mold (male mold) 50, and an upper mold (female mold) 90. In addition, the base 20
A movable base 70 that can be moved up and down is provided on the top. As shown in FIG. 1, columns 30 and 40 are attached to the upper surface of the base 20 in a direction perpendicular to the upper surface of the base 20. Although not shown, in FIG. 1, on the other side of the columns 30, 40, the same columns as the columns 30, 40 are mounted at symmetrical positions. The bottom surface of the lower mold 50 is supported on the upper ends of the columns 30 and 40.

As shown in FIG. 2, two air-driven cylinders 60 are mounted on the upper surface of the base 20 in a direction perpendicular to the upper surface of the base 20. The cylinders 60 are fixed to the upper surface of the moving base 70, and the lower ends of the piston rods 64 are fixed to the upper surface of the base 20, respectively.
That is, when the cylinders 60 are driven to extend their piston rods 64 (when the piston rods 64 extend from the lower surface of the moving base 70),
The moving base 70 is raised, and the piston rods 64, 6
When 4 contracts, the moving base 70 descends.

The bases 8 of the two air-driven cylinders 80 are provided on both sides of the center of the moving base 70.
2 and 82, respectively, as shown in FIG. 1, the piston rods 84 of the cylinders 80 and 80,
The upper end of the upper die 84 is attached to the side surface of the upper die 90 (the state where two cylinders 80 are attached is shown in FIG.
Shown). Bases 82, 82 of the cylinders 80, 80
Is rotatably fixed to the side surface of the moving base 70 by a retaining pin 86, and the upper ends of the piston rods 84, 84 are rotatable by the pin 88 on the side surface of the upper die 90. It is fixed to the shaft.

A pipe-shaped guide member 22 for supporting the front end of the movable base 70 is inserted between the bottom surface of the lower die 50 and the upper surface of the base 20. Although not shown, in FIG. 1, the same guide member as the guide member 22 is inserted at the symmetrical position of the front end of the moving base 70 beyond the guide member 22. On the upper surface of the rear end of the movable base 70, a pipe-shaped guide member 24 is attached in a vertical direction with respect to the upper surface of the movable base 70. The bottom surface of the rear end is supported. The upper end of the guide member 24 is rotatably fixed to the bottom surface of the rear end of the upper die 90 by a pin 26 so as to be rotatable. That is, the pin 26 serves as a fulcrum when the upper die 90 rotates.

At the rear of the side surface of the lower die 50, the upper die 9 is provided.
A stopper member 42 that passes through the side of the upper die 90 and protrudes above the upper die 90 is attached. This stopper member 4
Above the cylinder 2, an air-driven cylinder 44 is attached, and its piston rod (not shown) is perpendicular to the side surface of the upper die (the direction in which the piston rod comes off from the top of the paper of FIG. 1 to the back of the paper). It is designed to protrude. Although not shown, another stopper member identical to the stopper member 42 to which the cylinder 44 is attached is mounted on the other side of the stopper member 42 (left side surface of the upper die 90).

That is, when the upper die 90 is rotated to the position indicated by A in FIG. 1, the upper die 90 is erroneously closed by projecting the piston rods of the piston cylinders 44 respectively. Even in this case, the upper die 90 can be blocked at the position indicated by B in FIG. 1 by the two piston rods. As shown in FIGS. 2 and 3, an air-driven cylinder type auto-lock mechanism fixed to the lower die 50 and holding the pressure inside the die is provided at the lower end of the front surface of the upper die 90. 92, 9
On the back surface of the upper die 90, air-driven cylinder type auto lock mechanisms 99, 99 are respectively attached. Further, the auto-lock mechanism 99 is attached to both side surfaces of the upper die 90, respectively.

Next, the internal structure of the upper mold 90 and the lower mold 50 will be described with reference to FIG. FIG. 4A is a schematic cross-sectional view showing the internal structure of the upper die 90 and the lower die 50, and FIG. 4B is a view of the insert molding metal fitting 52 attached to the cavity surface of the lower die 50. FIG. 4 is a partially enlarged explanatory view showing an attached state. As shown in FIG. 4A, a chamber 9 inside the mold is provided in front of the upper mold (female mold) 90.
A plurality of steam inlet holes 9 for flowing steam for heating into 4;
1 and a plurality of cooling water inlet holes 96 for flowing cooling water.
Are formed. In the chamber 94, a plurality of spray nozzles 95 for spraying the flowed cooling water to the back surface of the cavity 93 are provided.
Further, on the back surface of the upper die 90, the chamber 94 is provided.
A plurality of discharge holes 9 for discharging the cooling water W accumulated in the inside
7 are formed.

On the other hand, a plurality of cooling water inflow holes 56 for flowing cooling water and a plurality of cooling water inflow holes for heating into the chamber 54 inside the mold are provided in front of the lower mold (male mold) 50. A vapor inflow hole 58 is formed in the chamber 54.
A plurality of injection nozzles 55 for injecting cooling water are formed therein. A plurality of discharge holes 57 for discharging the cooling water accumulated in the chamber 54 are formed on the bottom surface of the lower mold 50. Further, the lower mold 50 has a convex portion 53 passing through the chamber 54 from the bottom surface.
A raw material injection pipe 501 for injecting a foamed resin molding raw material into the cavity 93 is formed on the upper surface of the substrate. As shown in FIG. 5B, plate-like metal fittings 52 for insertion are placed on the front and back of the upper surface of the convex portion 53 of the lower mold 50. Metal fittings for insert 5
Reference numerals 2 and 52 are respectively attached by inserting positioning pins 51 and 51 projecting from the upper surface of the convex portion 53.

If the metal fittings 52 are warped and cannot be in close contact with the upper surface of the convex portion 53,
As shown in FIG. 5B, a magnet 59 is embedded under the upper surface of the convex portion 53, and the metal fitting 52 is attracted to the upper surface by the magnetic force. Then, when the upper mold 90 is joined to the lower mold 50 by a foaming resin molding method described later, a foam is formed in a space between the cavity 93 of the upper mold 90 and the convex portion 53 of the lower mold 50. A resin molded product is molded.

Next, the operation of the foamed resin molding machine 10 having the above configuration will be described with reference to FIG. FIG. 5 is a schematic diagram of the right side surface of the foamed resin molding machine 10. First, when the piston rods 64, 64 of the cylinders 60, 60 shown in FIG. 2 are extended (the cylinders 60, 60 are raised), the moving base 70 fixed to the bottom surfaces of the cylinders 60, 60 is moved by the guides. It rises along the member 22. At this time, the cylinder 8 attached to the moving base 70
0, 80 and the guide member 24 also rise, so that the upper dies 90 supported by the piston rods 84, 84 of the cylinders 80, 80 and the upper end of the guide member 24 rise (FIG. 5 (a)).

The rising height of the upper mold 90 depends on the shape of the cavity 93 of the upper mold 90 and the convex portions 5 of the lower mold 50.
3, which is determined by the shape of the foamed resin molded product to be manufactured (for example, 100 mm). Specifically, in FIG. 4, the upper mold 90 is replaced by the lower mold 50.
When the upper mold 90 is raised and rotated from the joined state, the lower mold 50 is placed on the inner wall surface 98 of the cavity 93 of the upper mold 90.
Is set to a sufficient height so that the corners 531 of the convex portions 53 do not come into contact with each other. Next, with the upper die 90 raised, the piston rods 84, 8 of the cylinders 80, 80 are moved.
When each of the extension members 4 is extended, the extension force causes the upper mold 90 to move upward, that is, in a direction away from the lower mold 50, at a fixed angle about the pin 26 of the guide member 24 (for example, as shown by a dashed line in FIG. 85 ° at the position of the upper die 90)
Rotate.

As described above, the foamed resin molding machine 1 of this embodiment
0, the upper mold 90 can be raised and then pivoted about one end (rear end) of the upper mold 90 in a direction away from the lower mold 50. Type 90
The corner 531 of the convex portion 53 of the lower mold 50 does not contact the inner wall surface 98 of the cavity 93. Therefore,
Since there is no restriction on the shape of the upper die 90 and the lower die 50, there is no restriction on the shape or size of the foamed resin molded product. When closing the upper die 90, the piston rods 84, 8 of the cylinders 80, 80 are closed.
4 is contracted, and then the piston rods 64, 64 of the cylinders 60, 60 are contracted (cylinders 60, 6).
0 is moved down).

Next, the foamed resin molding method of the present invention will be described with reference to FIGS. 5 and 6, based on FIG. FIG. 6A shows the upper mold 90 and the lower mold 50 shown in FIG.
FIG. 6B is a schematic cross-sectional view of the upper mold 9 shown in FIG.
FIG. 7 is a schematic cross-sectional view of a lower mold 50 and a lower mold 50. FIG. 7 is a process diagram of the foamed resin molding method. First, the upper mold 90 is closed, and the auto lock mechanisms 92 and 9 shown in FIGS.
According to 2, 99, 99, the upper mold 90 is replaced with the lower mold 50.
(Step 100). Next, the foamed resin molding raw material is injected from a raw material injection pipe 501 formed in the lower mold 50, and the foamed resin molding raw material is injected into a cavity 93 formed on a mating surface between the upper mold 90 and the lower mold 50. Fill (step 200). As this raw material, for example, beads obtained by combining a styrene monomer or polyethylene and a foaming agent are used.

Subsequently, the heated steam flows into the chamber 94 from the steam inlet 91 of the upper mold 90 and the chamber 54 from the steam inlet 58 of the lower mold 50.
Then, the inside of the cavity 93 is heated, and the foamed resin molding material in the cavity 93 is fused (step 300). Next, the cooling water flows into the cooling water inflow holes 96 of the upper mold 90 and the cooling water inflow holes 56 of the lower mold 50, and the cooling water flows from the injection holes 95 and 55 in the chambers inside the molds. By spraying, the inside of the cavity 93 is cooled and the foamed resin molding material in the cavity 93 is solidified (step 400).

Subsequently, the cylinders 60 are driven to raise the moving base 70, and the upper die 90 is raised (step 500). Subsequently, the cylinder 80,
80 to rotate the upper die 90 (step 60).
0) The cooling water accumulated in the chamber 94 of the upper die 90 is discharged from the discharge hole 97. Then, the cavity 93
The inside of the foamed resin molded product is released from the mold to complete one process (process 700). As described above, according to the foamed resin molding method of the present embodiment, the steps 500 and 600 of raising the water-cooled upper mold 90 and then rotating the raised upper mold 90 away from the lower mold 50. Therefore, the inner wall surface 98 of the upper die 90 does not come into contact with the corner 531 of the lower die 50 (see FIG. 6). Therefore, a foamed resin molded product can be manufactured without being limited by the shape and size of the foamed resin molded product to be manufactured.

In the above embodiment, the means for raising and rotating the upper die 90 is used. However, the lower die 50 may be lowered before the upper die 90 is rotated. Good. Further, after lowering the lower mold 50, the lower mold 50 may be rotated.

In the above embodiment, the moving base 7 is used as means for raising and rotating the upper die 90.
0, the cylinders 60, 60, the cylinders 80, 80 and the guide member 24 are used, but the bases 82, 82 of the cylinders 80, 80 are fixed to the base 20 and the cylinders 8
The 0, 80 piston rods 84, 84 may be operated to extend a certain height in the vertical direction, and then may be operated to extend in the rotating direction.

In addition, a hydraulically driven cylinder may be used in place of each of the above-mentioned air-driven cylinders.
The lower die 50 or the moving base 70 moves up and down, and the upper die 90
May be performed using a motor.

In the above embodiment, the moving base 70, the cylinders 60, 60, the cylinders 80, 80, the guide member 24,
The pin member 26, the pin member 86, and the pin member 88 correspond to the mold opening means of the present invention. Also, cylinders 60 and 6
0 and the moving base 70 serve as the lifting / lowering means,
Reference numerals 80 each correspond to a rotating means.

[0035]

As described above, according to the present invention, the upper mold and the lower mold are separated from each other by a predetermined distance, and one of the upper mold and the lower mold is moved to the other. Since one end can be rotated in the direction away from the other mold, the cavity surfaces of both molds come into contact when one of the upper mold and the lower mold is rotated. Can be prevented. Therefore, since the shapes of the upper mold and the lower mold are not limited, it is possible to manufacture a foamed resin molded product without being limited by the shape and the size. In addition, it is possible to prevent the cavity surfaces of the upper mold and the lower mold from being damaged.

[Brief description of drawings]

FIG. 1 is a right side explanatory view of a foamed resin molding machine of the present invention.

FIG. 2 is an explanatory front view of the foamed resin molding machine shown in FIG.

FIG. 3 is an explanatory plan view of the foamed resin molding machine shown in FIG. 1;

4A is a cross-sectional explanatory view showing an internal structure of an upper die and a lower die, and FIG. 4B is a mounting portion of an insert fitting provided on the lower die shown in FIG. FIG.

FIG. 5 (a) is a schematic right side view showing a foamed resin molding machine in which an upper mold is raised, and FIG. 5 (b) is a schematic right side view showing a foamed resin molding machine in which an upper mold is rotated. .

FIG. 6 (a) is a schematic right side view showing an upper mold that has been raised, and FIG. 6 (b) is a schematic right side view showing a rotated upper mold.

FIG. 7 is a process diagram showing a foamed resin molding method of the present invention.

FIG. 8 (a) is a schematic view showing a conventional horizontal foamed resin molding machine, and FIG. 8 (b) is an enlarged view of a mounting part of a metal fitting for insert provided on the male mold of FIG. 8 (a). FIG.

FIG. 9 is a schematic diagram showing an upper mold and a lower mold of a conventional vertical foam resin molding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Foam resin molding machine 20 Base 30, 40 Prop 50 Lower die 60, 80 Cylinder 65, 84 Piston rod 70 Moving base 90 Upper die

Claims (5)

[Claims] 1. A foaming resin molding material is filled into a cavity formed on a mating surface of an upper mold and a lower mold, and the molds are heated to fuse the foaming resin molding material in the cavity. In a foaming resin molding machine that water-cools the mating surfaces of the mold from the inside of the mold and releases the foamed resin molded body in the cavity, the upper mold and the lower mold are separated from each other by a predetermined distance between the mating surfaces. And a mold opening means for rotating one of the upper mold and the lower mold about one end thereof in a direction away from the other mold. Machine. 2. The mold opening means sets the upper mold and the lower mold at a predetermined distance between the mating surfaces of the upper mold and the lower mold, and moves the upper mold to the lower mold around one end thereof. 2. The foamed resin molding machine according to claim 1, wherein the machine is rotated in a direction away from the mold. 3. The mold opening means raises the upper mold from the lower mold to a predetermined height, and moves the raised upper mold in a direction away from the lower mold around one end thereof. The foamed resin molding machine according to claim 1, wherein the machine is rotated. 4. The mold opening means includes a moving base provided below the lower mold and supported so as to be able to move up and down, an elevating means for moving the moving base up and down,
4. The foamed resin molding machine according to claim 3, further comprising a rotating unit attached to the moving base and rotatably supporting the upper die. 5. A foaming resin molding material is filled in a cavity formed on a mating surface of an upper mold and a lower mold, and the molds are heated to fuse the foaming resin molding material in the cavity. In a foaming resin molding method of water-cooling the mating surfaces of the mold from the inside of the mold and releasing the foamed resin molded body in the cavity, the water-cooled upper mold and the lower mold are separated by a predetermined distance between the mating surfaces. A foamed resin molding method, comprising a step of rotating the one of the upper mold and the lower mold about one end thereof in a direction away from the other mold while keeping the molds separated from each other. .