JPH048528A - Blow molding die - Google Patents

Abstract

PURPOSE:To retain the shape of a separated unset flask without letting said crosshead fall at the time of moving a blow molding die out of a molding machine after the end of closing by providing a parison-retaining part at the top of a divided die. CONSTITUTION:Open divided dies 10a, 10b are opened and a parison 13 is extruded from a molding machine head H and positioned between the divided dies 10a and 10b. The divided dies 10a and 10b are closed with the parison 13 held between. Simultaneously with said closing, a parison-retaining part 20 comes in contact with the periphery of a flask 14, in which state air is blown into the parison 13 which is then stuck to the wall surfaces of the divided dies 10a and 10b of a cavity 1 and molded into a hollow body. The flask 14 is separated from the molding machine head H in the upper part of the parison- retaining part 20. The flask 14 is retained in a raised state by the parison- retaining part 20. A blow molding die 10 is moved, as it is in the closed state, out of a molding machine and cooled for a given period of time. After cooling, a fetching machine 30 holds blow molded body F, opens the divided dies 10a, 10b and takes out the blow molded body F.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The second invention relates to a blow molding die used in a molding machine.

[Prior Art] Conventionally, a method of blow molding a molded product using a blow molding die (mold) 1 has been known.

This blow molding method is carried out using a molding machine (
A pair of split molds 1a and 1b fixed with bolts or the like to a mold clamping plate 2 (not shown) are placed in an open state in which they are separated from each other, and a parison (cylindrical molten resin) 4 is opened from the molding machine head 3.
After extruding and disposing between the split molds 1a and lb (see FIG. 12(a)), the split molds 1a and lb are closed to form a space in a clamped state for molding. Air is blown into the parison 4 while being sandwiched between the split metal molds fila and lb, and the parison 4 is brought into close contact with the split molds 1a and lb in the space, and the split metal molds 1a and 1b are tightly attached to each other.

(b) By being cooled from the wall surface, it is formed into a predetermined shape and becomes a hollow molded body 5, an upper burr 5a, and a lower burr 5b (
(See FIG. 12(b)).

The hollow molded body 5 is then automatically taken out by a take-out machine 6 shown in FIG.

This take-out machine 6 has a structure in which it moves back and forth along a rail 7 and a pair of arms 8, 8 at its tip open and close.

After the mold is clamped, wait for the upper burr 5a to solidify while the upper burr 5a is connected to the molding machine head 3, and after the take-out machine 6 moves forward (direction A shown in FIG. 13(b)), both arms 8 8 is closed (direction B shown in FIG. 13(a)) and the upper burr 5 is closed.
a, and after opening the mold, it is moved backward (direction C shown in FIG. 13(b)) and the hollow molded body 5 is taken out.

For this reason, the mold 1 had to be placed and fixed within the molding machine substantially directly below the molding machine head 3.

[Problems to be Solved by the Invention] However, when molding is performed using a plurality of molds 1 in a molding machine with two tables, the mold 1 after mold clamping is moved outside the molding machine and the next mold is moved. However, if the molding machine head 3 is also separated and the mold 1 is moved before the upper burr 5a held by the take-out machine 6 is solidified, the unsolidified upper burr 5a will have a different shape. There was a problem that the hollow molded body 5 could not be taken out because it could not be held and fell down and could not be held between the arms 8, 8.

This invention was made in view of the above problems, and
The purpose of this is to create a hollow mold that can maintain its shape without falling over when the hollow molding die is moved out of the molding machine after mold clamping is completed. Our goal is to provide molds.

[Means for Solving the Problems] In order to achieve the above object, the hollow molding die according to the present invention has the following features: A parison extruded from a molding machine head is clamped and molded between a pair of split molds. A hollow molding die that forms a hollow molded body between the split molds, and forms an upper part between the split molds that is integral with the hollow molded body and is held by a clamping member of a take-out machine, When the split mold is clamped, the upper part is held in an upright state by contacting the periphery of the upper part, even after the upper part is separated from the molding machine head, and is maintained in the upright state. The present invention is characterized in that a parison holding part is provided on the upper part of the split mold, which allows the split mold to be opened while the upper paris is held between the holding members.

[Function] With the hollow molding die according to the present invention, the parison holding part contacts the periphery of the upper paris during mold clamping, and holds the upper paris in an upright state even after the upper paris is separated from the molding machine head. Furthermore, the hollow molding die can be opened while the upper part held in an upright position is held between the holding members.

[Example] Hereinafter, an example of a blow molding die according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the hollow molding mold 10 is composed of a pair of split molds 10a and Job that are separated into left and right sides, and the split molds 10a and 10b are clamped to close the split molds 10a and 10b. A hollow part 11 whose upper and lower ends are closed is formed in the part. The split mold 10a and the lob each have mold clamping plates 12a.

12b with bolts or the like.

This hollow molding die 10 is disposed below the molding machine head H of a molding machine (not shown) and at a position spaced apart from the molding machine head H, and has a cavity 11 approximately directly below the molding machine head H. is located. Also, it is placed on trolley C,
It can be moved freely on the floor FL screen using wheels C (see Fig. 3).

After the parison (cylindrical molten resin) 13 extruded from the molding machine head H is positioned between the split molds 10a and 10b (see FIG. 2(a)), the split molds 10a and 1
The parison 13 is sandwiched from both sides by closing the mold 0b. In this state, air is blown into the inside of the parison 13,
By cooling the parison 13 in close contact with the split molds 10a and 10b, a hollow molded body F along the peripheral wall of the cavity 11 is formed. At this time, since the parison 13 located above and below the cavity 11 is pressed by the contact surfaces of the split molds 10a and 10b, the boundary portion with the hollow mold 10 is sandwiched in a flat shape, and the hollow An upper burr 14 connected to the molding machine head H is formed above the molding die 10, and a lower burr 15 is formed below the hollow molding die IO (Fig. 2(b)).
reference).

At the upper part of the hollow molded metal ff1lo, there is a parison holding part 20.
is formed.

The parison holding part 20 has a - side that is divided into gold filOaJOb.
It is formed into a cubic shape that is flush with the contact surface of the split mold LOa, and three pieces are protruded from the upper part of the split mold LOa and lob at equal intervals, and the parison holding part 20 of the split mold LOa Parison holding part 20 of divided money ff 10b
are placed facing each other (see Figure 1).
. Therefore, the parison holding part 20 is attached to the hollow mold 10.
It comes into contact with the periphery of the upper burr 14 when the mold is clamped.

Further, a claw 33, which will be described later, can be inserted into the gap d1 between each parison holding part 20.

As shown in FIG. 3, a take-out machine 30 is arranged on the side and above the molding machine.

The takeout machine 30 includes a substrate 32 supported by a support member 31;
It has four L-shaped claws 33 protruding from the back surface of the substrate 32 (see FIG. 6), and can be freely raised and lowered by a lifting means (not shown) such as a cylinder device, for example.

The four claws 33 are arranged in pairs with their tips 33a facing each other and spaced apart, and the two pairs are arranged side by side.

The winter melon 33 is provided so that the opposing claws 33 can approach and separate from each other (the directions are indicated by arrows in FIG. 6).

Next, the operation of the hollow molding die according to this embodiment will be explained.

2 to 5 show a system for molding a hollow molded body F using a hollow molding die 1o.

First, as shown in FIG. 2(a), the installment amount filoa,
With the mold 10b in an open state, the libarithon 13 is pushed out from the molding machine head H and positioned between the split molds 10a and 10b.

Subsequently, as shown in FIG. 2(b), the parison 13 is sandwiched and the split metals TJI 10a, 10b are tightened to create a mold-clamped state. At this time, the upper burr 14 on the upper part of the hollow mold Wxo has the shape-retaining force to form a cylindrical body, but is in a displaceable state, and because it is connected to the molding machine head H, it maintains the shape when the mold is clamped. Maintains a certain standing position. Also,
Simultaneously with the mold clamping, the parison holding portion 2o comes into contact with the periphery of the upper burr 14.

In this state, air is blown into the inside of the parison 13, and the parison 13 located in the cavity 11 is
iloa, 10b are molded into a hollow body shape in close contact with the wall surface.

Then, the upper burr 14, which is in a displaceable state, is separated from the molding machine head H at the upper part of the parison holding part 20. The separated upper burr 14 cannot maintain its upright state and tries to fall to the side, but the parison holding section 20 holds it in its upright state even after it is separated from the molding machine head H (
(See Figure 1).

Thereafter, as shown in FIG. 3, the hollow molding die 10 in the clamped state is moved to the outside of the molding machine together with the cart C and positioned below the take-out machine 30, thereby forming the split mold 10a.

It is cooled for a certain period of time via the wall surface of 10b.

After cooling, as shown in FIG.
Approach from above, insert the winter melon 33 into the gap d between the parison holding parts 20 and remove the upper burr 14.
The split molds 10a and 10b are opened with the winter melon 33 sandwiching the upper burr 14 so that the take-out machine 30 grips the hollow molded body F, and as shown in FIG. 5, the take-out machine 30 is moved upward and the hollow molded body F is taken out.

6 to 9 show a series of movements of the take-out machine 30 when taking out the hollow molded body F. Here, FIG. 6 corresponds to FIG. 3, FIG. 7 corresponds to FIG. 4, and FIG. 9 corresponds to FIG. 5.

FIG. 6 shows a state in which the hollow molding die 10 has been moved outside the molding machine. FIG. 7 shows a state in which the take-out machine 3o has descended, closed the claws 33, and has the tip 33a clamping the upper burr 14 from both sides. FIG. 8 shows a state in which the split molds 10a and 10b are opened while the take-out machine 3o holds the hollow molded body F.

FIG. 9 shows a state in which the take-out machine 3o holds the hollow molded body F and is raised.

As described above, with the hollow mold 1° according to the above embodiment, the parison holding section 20 can hold the upper burr 4 in the upright state even after the upper burr 14 is separated from the molding machine head H. It is possible to prevent the upper burr 14 from falling down when the hollow molding die 10 is moved.

Further, another example of the parison holding section 20 is shown in FIG. 10.

The hollow molding die 15 shown in FIG.
5. The parison holding part 25 is formed of an L-shaped columnar body having a short piece 26 and a long piece 27. When the mold is clamped, the dividing metal TJ 15a is attached so that the short piece 26 and the long piece 27 face each other as a pair. , 15b are arranged in parallel above each other. The tip of this short piece 26 is divided into fi15 pieces.
The long pieces 27 are fixed to the upper surfaces of the members a and 15b, and the long pieces 27 are spaced apart from and parallel to each upper surface. Therefore, a gap d2 is formed between the upper surface of the hollow molding die 15 and the long piece 27. In addition, both parison holding parts 25.2
5 is formed flush with the contact surfaces of the split molds 15a and 15b, and when the hollow molding mold 15 is clamped, both parison holding parts 25 and 25 are placed around the upper burr 14. come into contact with

Both arms 36 and 36 at the tip of the extractor 35 can be inserted into this gap d2.

The take-out machine 35, which is placed on the side of the hollow mold 15, has two arms 36.3 at its tips that are made of rod-shaped bodies that can be opened and closed freely.
6, and can hold the hollow molded body F from both sides (see FIG. 11(a)). Further, the take-out machine 35 is movably mounted on a rail 37, and moves toward and away from the hollow molding die 15.

When holding the hollow molded body F, the take-out machine 35 approaches the hollow mold 15 with both arms 36 and 36 open (the 11th
(direction A shown in Figure 11(b)) and position it on the side of the upper burr 14, then close both arms 36, 36 (direction B shown in Figure 11(a)) and insert the upper burr into the gap d2. 14 from the side. With both arms 36 and 36 sandwiching the upper burr 14 so that the take-out machine 35 holds the hollow molded body F, the hollow mold 15 is opened and the take-out machine 35 is moved (Fig. 11(b)
) and take out the hollow molded body F.

[Effects of the Invention] The hollow molding die according to the present invention: A parison extruded from a molding machine head is clamped and molded between a pair of split molds, thereby forming a hollow molded body between the split molds. In addition, in a hollow molding die which forms an upper part between the split molds, which is integral with the hollow molded body and which is held by a holding member of a take-out machine, when the pair of split molds is clamped, the upper part is By abutting around the periphery of the molding machine head, the upper pad is held in an upright state even after it is separated from the molding machine head, and the upper pad held in the upright state is held between the clamping members. The present invention is characterized in that a parison holder is provided on the upper part of the divided mold to enable the divided mold to be opened.

Therefore, when the hollow molding die is moved out of the molding machine after mold clamping is completed, the shape of the unsolidified upper part, which is separated from the molding machine head, can be maintained without falling over. After the molded body is moved to a position away from the molding machine head, the molded body can be automatically taken out from the hollow molding die, and molding can be performed using a plurality of hollow molding molds with a single molding machine.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing a hollow molding die according to the present invention. FIG. 2 shows the state of molding using a hollow mold, in which (a) is an explanatory diagram when the mold is opened, and (b) is an explanatory diagram when the mold is closed. 3 to 5 show the state in which the hollow molded body is taken out by the take-out machine, FIG. 3 is an explanatory diagram of the state in which the mold is located below the take-out machine, and FIG. FIG. 5 is an explanatory view of the state in which the upper part is held, and FIG. 5 is an explanatory view of the state in which the take-out machine takes up the hollow molded body above the mold. Figures 6 to 9 show how the hollow molded body is taken out by the take-out machine from other directions, with Figure 6 being an explanatory diagram corresponding to Figure 3, and Figure 7 corresponding to Figure 4. Explanatory diagram, No. 8
The figure is an explanatory diagram showing a state in which the hollow molding die is opened after the take-out machine holds the hollow molded body, and FIG. 9 is an explanatory diagram corresponding to FIG. 5. FIG. 10 is a partial perspective view of a hollow molding die showing another example of the parison holding portion. FIG. 11 shows the state in which the hollow molded body is taken out by the take-out machine from the blow molding die shown in FIG.
) is an explanatory view seen from above, and (b) is an explanatory view seen from the side. FIG. 12 and FIG. 13 show a conventional example. FIG. 12 shows the state of molding using a hollow mold, in which (a) is an explanatory diagram when the mold is opened, and (b) is an explanatory diagram when the mold is closed. FIG. 13 shows the state in which the hollow molded body is taken out, with (a) being an explanatory view seen from above, and (b) being an explanatory view seen from the side. 10.15...Blow molding molds 10a, 10b, 15a, 15b=・Divided mold 13...
・Parison 14... Upper burr 20.25... Parison holding part 30.35... Takeout machine F... Hollow molded body H... Molding machine head No. (a) Figure (b) H... - Molding machine head Fig. 1O...Blow molding die 10a, Job...Divided mold 13...Parison 14...Upper burr 20...Parison holding part Fig. Fig. Fig. Fig. Figure Figure Figure 36... Arm (pinching member) (b) Figure (a) (b) Figure (a) (b)

Claims (1)

[Claims] By clamping and molding the parison extruded from the molding machine head between a pair of split molds, a hollow molded body is formed between the split molds, and the parison is integrally formed with the hollow molded body. Further, in a hollow molding die in which an upper burr held by a clamping member of a take-out machine is formed between the split molds, the upper burr is formed by abutting around the upper burr when the pair of split molds is clamped. The upper burr is held in an upright state even after the burr is separated from the molding machine head, and the divided mold is opened with the upper burr held in the upright state being held between the holding members. A hollow molding mold, characterized in that a parison holding part is provided on the upper part of the split mold.