JP2003011151A - Expanded resin molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously manufacture two expanded polystyrene products by using a single expanded resin molding machine. SOLUTION: This expanded resin molding machine comprises a cavity side die G1 to be fitted to a die plate D1 on the cavity side and a movable die G2 fitted to a movable side die plate D2, a support frame F which bridges between the movable side die plate D2 and the cavity side die plate D1, a third intermediate die G3 which is arranged between the cavity side die G1 and the movable side die G2 through the support frame F and transferred following the reciprocating movement of the movable side die plate D2 and a positioning shaft 6 of a specified length which is arranged between the cavity side die G1 and the intermediate die G3 and regulates an intermediate position for the third intermediate die G3 when the cavity side die G1 and the movable die G2 are opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed resin molding machine for molding a foamed resin product used as a packaging filler, a cushioning material, or the like.

[0002]

2. Description of the Related Art Conventionally, foamed resin products have been widely used as packaging fillers, cushioning materials and the like for packaging and transporting electric products and electronic devices. Typical examples of foamed resin products are expanded polystyrene, which is polystyrene formed by expanding bubbles, but various types such as expanded polyethylene made by foaming polyethylene resin and urethane foam made by adding a blowing agent to polyisocyanate. Are being developed. Styrofoam is molded as a product with a predetermined shape by forming expanded beads in advance by using polystyrene as a main raw material and supplying the expanded beads into a mold and supplying steam to expand the expanded beads.

A conventional foamed resin molding machine is provided with a pair of molds including a fixed-side mold attached to a fixed-side die plate and a movable-side mold attached to a movable-side die plate. A foam bead (foam resin material) is supplied between a female mold for molding the outside and a male mold for molding the inside of the product, and the product is expanded by steam and then cooled to manufacture a product having a predetermined shape.

[0004]

However, the conventional foamed resin molding machine has a pair of molds including a fixed side mold attached to the fixed side die plate and a movable side mold attached to the movable side die plate. Since it is equipped with one, it was possible to manufacture only one Styrofoam product from one foaming resin molding machine.

Therefore, it is conceivable to introduce two or more conventional foaming resin molding machines to improve the manufacturing efficiency. However, since a foaming resin molding machine is a large device and expensive, a plurality of machines are introduced. Doing is not an easy matter in terms of cost and location.

Therefore, an object of the present invention is to provide a foamed resin molding machine which is capable of simultaneously producing two foamed polystyrene products while being one foamed resin molding machine.

[0007]

According to a first aspect of the present invention, there is provided a foamed resin molding machine in which a fixed-side die attached to a fixed-side die plate, a movable-side die attached to a movable-side die plate, and a movable-side die. A support frame that is bridged between the die plate and the fixed-side die plate, and is arranged between the fixed-side mold and the movable-side mold via the support frame, and moves with the reciprocating movement of the movable-side die plate. A third intermediate mold, and an intermediate position of the third intermediate mold when the fixed side mold and the movable side mold are opened, provided between the fixed side mold and the third intermediate mold. And a positioning shaft having a predetermined length that regulates

According to the present invention, the third intermediate die is constructed so as to be movable between the fixed side die plate and the movable side die plate via the support frame. Therefore, when the movable die plate is moved in the direction of closing the movable die, first, the movable die plate comes into contact with the third intermediate die via the support frame to move the movable die and the third die. When the intermediate die is closed and then the movable die plate is further moved, the movable die plate and the third intermediate die come into contact with the fixed die plate through the support frame to move the third die. The intermediate mold and the stationary mold are closed. Therefore, by supplying the foamed resin material between the third intermediate mold and the fixed-side mold and supplying the foamed resin material between the third intermediate mold and the movable-side mold, It is possible to mold individual foamed resin products at the same time.

On the other hand, when the movable die plate is moved in the direction in which the movable die is opened, first, the movable die plate moves along with the third intermediate die through the support frame, so The intermediate mold and the fixed mold will be opened. When the movable die plate is further moved in the opening direction, the movable die plate is provided with a positioning shaft having a predetermined length that regulates the intermediate position of the third intermediate die. Even if moved, the third intermediate mold cannot move in the opening direction beyond the intermediate position between the fixed side mold and the movable side mold, and the third intermediate mold and the movable side mold do not move. Will be opened. Therefore,
After the third intermediate mold and the fixed mold are opened,
Subsequently, the mold opening between the third intermediate mold and the movable mold is performed.

In the foamed resin molding machine according to a second aspect of the present invention, four tie bars are bridged at four corners between the movable side die plate and the fixed side die plate, and the support frame has four. Four support frames are laid along the inside of the tie bar, and the four support frames are slidably attached to the through holes of the fixing plate that is provided so as to project to the outer periphery of the third intermediate mold. It is characterized by being

According to the present invention, since the support frame has the four-piece structure arranged along the inner side of the four tie bars, the third intermediate mold is stably supported, and the movable-side die plate. It will move smoothly with the movement of. Further, since the support frame is slidably attached to the through hole of the fixing plate provided so as to project to the outer periphery of the third intermediate mold, the weight of the third intermediate mold (self-weight). Acts on the support frame and moves smoothly as the movable die plate moves.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIGS. 1 to 3, in addition to the fixed side mold G1 attached to the fixed side die plate D1 and the movable side mold G2 attached to the movable die plate D2, And a third intermediate mold G3 arranged between them. The fixed die plate D1 and the movable die plate D2 are supported by four tie bars B arranged on the base 2 and the side wall 3 standing upright from the base 2. The mold clamping cylinder P is mounted on the side wall 3, and the tip of the piston rod Pa of the mold clamping cylinder P is fixed to the movable die plate D2. Therefore, when the piston rod Pa of the mold clamping cylinder P is driven, the movable die plate D2 reciprocates with respect to the fixed side die plate D1, and mold clamping and mold opening are possible.

The third intermediate mold G3 has four tie bars B.
Are attached via four support frames F arranged along the inner side of. Each of the four support frames F is
The base end side Fb is attached to the movable side die plate D2, and the tip end side Fa penetrates the fixed side die plate D1 and is bridged between the two die plates D1 and D2. That is, the fixing plate 5A for penetrating the support frame F is provided at four locations on the outer periphery of the third intermediate mold G3 so as to project, and the fixing plate 5A for penetrating the support frame F on the outer periphery of the fixed side die G1 is fixed. The plate 5B is provided so as to project. Each of the support frames F has a round bar shape made of aluminum, and penetrates the through holes 8a and 8b of the fixed plates 5A and 5B and the through holes 8c of the four corners of the fixed die plate D1. Are distributed. It can be said that such four support frames F are mold side tie bars arranged along the inside of the four tie bars B. Therefore, when the movable die plate D2 is moved in the mold clamping direction, the front end side Fa of the support frame F is projected to the rear (the left side in FIG. 2) of the fixed side die plate D1 for a long time (FIG. 2). ). The movable side mold G2 is also provided with a fixed plate 5C corresponding to the position of the fixed plate 5A of the third intermediate mold G3. However, the base end side Fb of the support frame F is connected to the movable side mold G2. It is fixed (Fig. 6).

The third intermediate mold G3 is a rectangular frame made of aluminum together with the fixed mold G1 and the movable mold G2. The size of the third intermediate mold G3 of the present embodiment is 1050 mm in length (height), 1280 mm in width, and 150 mm in width, and the weight thereof is about 250 kg. Fixing plates 5A are provided at four locations on the outer circumference of the third intermediate mold G3, and a shaft fixing portion 7 for fixing the positioning shaft 6 is provided. The support frame F of the round bar has a diameter of 60 mm.

Two positioning shafts 6 are provided between the fixed side mold G1 and the third intermediate mold G3.
The positioning shaft 6 regulates the intermediate position of the third intermediate mold G3 when the fixed-side mold G1 and the movable-side mold G2 are opened, and the base end side 6b is the fixed part 7 for the shaft. Is fixed to the front end side 6a and the fixed side die plate D1
Penetrates through. Restricting rings 9A and 9B for restricting the movement of the third intermediate mold G3 are mounted on the distal end side 6a and the proximal end side 6b of the positioning shaft 6, respectively. The distance H between the fixed side mold G1 and the movable side mold G2 according to the present embodiment when the molds G1 and G2 are opened to the maximum extent (the state of FIG. 3)
1 is set to about 1600 mm, and the distance H2 between the two dies G1 and G3 in a state where the fixed side die G1 and the intermediate die G3 are opened to the maximum (state of FIG. 3) is set to about 800 mm. .

Molding dies K1, K2, K3a, and K3b are attached to the fixed-side mold G1, the movable-side mold G2, and the third intermediate mold G3, respectively, as shown in FIGS. There is. The molding dies K1, K2, K3a, K3b form the outer peripheral shape of the foamed resin product (styrofoam product) S into a predetermined shape, and are exchangeably attached corresponding to the desired foamed resin product (foamed polystyrene product) S. . On both sides of the third intermediate mold G3, a molding mold K3 as a male mold is formed.
a and K3b are attached, and the fixed-side mold G1 and the movable-side mold G2 are respectively attached with molding dies K1 and K2 as female dies. Molds K1, K2, K3a, K3
At the time of attaching b, it is attached via the setup jigs U1, U2, U3 provided on the outer periphery of each mold G1, G2, G3 (FIGS. 2 and 3).

Next, a case will be described in which the box-shaped foamed resin product S is actually molded using the mold structure 1 for the foamed resin product of the present embodiment. Here, a case will be described in which a Styrofoam product (foamed resin product) S is manufactured as a cushioning material that is housed in a cardboard box that carries electronic devices. The Styrofoam product (foamed resin product) S manufactured in the present embodiment has an outer circumference S as shown in FIG.
It is a cushioning material in which b is a rectangular shape and an octagonal opening Sa is formed in the center of the inside.

First, as shown in FIG. 2, when the movable die plate D2 is moved by the mold clamping cylinder P in the direction of closing the movable die G2, the movable die plate D2 is moved through the support frame F. The movable side die G2 and the third intermediate die G3 are closed (integrated) by abutting on the intermediate die G2 of No. 3, and then the movable side die plate D2.
Is moved, the movable movable die plate D2 and the third intermediate die G3, which are integral with each other via the support frame F, come into contact with the fixed die plate D1, and the third intermediate die G3 and the fixed die G1 and will be closed.

Therefore, foam beads (foam resin material) are filled between the fixed side mold G1 and the third intermediate mold G3 and between the third intermediate mold G3 and the movable side mold G2, respectively. Let me
When each of the molds is heated by supplying steam to promote foaming of the foam bead, the molding dies K1, K2, K3a,
The foamed resin product S following the shape of K3b is molded.

On the other hand, when performing mold opening, first, when the movable die plate D2 is moved in the direction of opening the movable die G2, the movable die plate D is moved through the support frame F.
2 moves with the third intermediate mold G3. That is,
The support frame F has a predetermined weight (about 250 kg) of the third
Since the load due to the own weight of the intermediate mold G3 of
The third intermediate mold G3 moves along with the movement of the support frame F, and the fixed side mold G1 and the third intermediate mold G3.
Mold opening is performed.

Next, when the movable die plate D2 is further moved in the opening direction, the third intermediate mold G3 is moved in the opening direction beyond the intermediate position between the fixed mold G1 and the movable mold G2. Therefore, the third intermediate mold G3 and the movable mold G2 are opened. That is, since the positioning shaft 6 for positioning the intermediate position of the third intermediate mold G3 is provided, it is longer than the predetermined length of the positioning shaft 6 (which is set so as not to be longer than about 800 mm). When the movable die plate D2 is moved, the third intermediate mold G is moved through the support frame F.
With 3 left behind, only the movable die plate D2 moves in the opening direction. Therefore, the third intermediate mold G3 and the movable side mold G2 are opened.

With the molds opened in this way (after mold release),
If the product S is taken out between the fixed side mold G1 and the third intermediate mold G3, and between the third intermediate mold G3 and the movable side mold G3, two foamed resin products S, It becomes possible to mold S at the same time.

Although not shown, the foamed resin material is filled by a supply means (supply gun), and the foamed resin material S is supplied through this supply means. The mold release is performed while supplying air (gas) between each of the molds G1, G2, G3 and the product S.

As described above, in the present embodiment, the case where the third intermediate mold G3 is the male mold and the fixed mold G1 and the movable mold G2 are the female molds has been described. Well, on the front and back surfaces of the third intermediate mold G3, different molds are used for the male mold and the female mold, while molds corresponding to the fixed mold G1 and the movable mold G2 are used. Of course, it is possible to do. Needless to say, the foamed resin product (foamed polystyrene product) S manufactured by the foamed resin molding machine 1 of the present invention is not limited to the above example.

[0026]

According to the foamed resin molding machine of the present invention, the fixed-side mold and the movable-side mold are interposed between the movable-side die plate and the fixed-side die plate via the support frame. With the configuration in which the third intermediate mold is arranged, it becomes possible to simultaneously mold two foamed resin products with one foamed resin molding machine. Further, since it suffices to provide the support frame, the third intermediate mold, and the positioning shaft between the movable side die plate and the fixed side die plate, it is only necessary to add these members and the foamed resin of the conventional configuration is obtained. It is possible to install the molding machine as it is at low cost.

[0027]

[Brief description of drawings]

FIG. 1 is a perspective view showing a foamed resin molding machine having a mold structure for a foamed resin product according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the mold of the foamed resin molding machine of the one embodiment is closed.

FIG. 3 is a cross-sectional view showing a state in which the mold of the foamed resin molding machine of the one embodiment is opened.

FIG. 4 is a perspective view showing a third intermediate mold and a molding mold therefor according to the one embodiment.

FIG. 5 is a perspective view showing the relationship between the product of the one embodiment and a molding die.

FIG. 6 is a perspective view showing a movable die and a molding die according to the one embodiment.

[Explanation of symbols]

1 foaming resin molding machine, B tie bar, D1 Fixed side die plate, D2 Movable die plate, F support frame, Fa support frame tip side, Fb support frame base end side, G1 fixed side mold, G2 Movable mold, G3 Third intermediate mold, 5A, 5B, 5C fixed plate, K1, K2, K3a, K3b molding dies, U1, U2, U3 setup jig, 6 Positioning shaft, 7 shaft fixing part, 9A, 9B restriction ring, S Foam resin products (foam resin materials),

Claims (2)

[Claims] 1. A fixed-side die attached to a fixed-side die plate, a movable-side die attached to a movable-side die plate, a support frame bridged between the movable-side die plate and the fixed-side die plate, and a support. A third intermediate mold that is arranged between the fixed-side mold and the movable-side mold via the frame and moves with the reciprocating movement of the movable-side die plate, and the fixed-side mold and the third intermediate mold. And a positioning shaft having a predetermined length, which is provided between the mold and the fixed side mold and the movable side mold and regulates an intermediate position of the third intermediate mold. Foam resin molding machine. 2. Four tie bars are bridged at four corners between the movable die plate and the fixed die plate, and four support frames are bridged along the inside of the four tie bars. 2. The foam according to claim 1, wherein the four support frames are slidably attached to through holes of a fixing plate that is provided so as to project to the outer periphery of the third intermediate mold. Resin molding machine.