JP3106677B2 - Flat blow 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 flat blow molding apparatus suitable for obtaining a flat product, and more particularly to a novel flat blow molding apparatus capable of changing the width of a flat parison extruded from the apparatus.

[0002]

2. Description of the Related Art In recent years, attempts have been made to manufacture thin flat products such as heat collecting plates for solar water heaters, casings, panels, furniture, and interiors for OA equipment by blow molding.

In this case, as shown in FIG. 7, a cylindrical parison a is extruded downward like a normal blow molding machine, and is sandwiched between thin molds b and c from right and left to inject air. The parison a, which expands due to the injection of air, is fixed at a portion a1 which _first comes into contact with the inner wall of the mold and extends right and left therefrom, so that a molded product having a uniform thickness cannot be obtained.

Accordingly, the present applicant does not extrude the cylindrical parison a first, but instead of extruding the hollow parison a through the gap between the flat core and the flat die surrounding the hollow core, the hollows matching the inner walls of the thin molds b and c. extruding a parison of the flat shape, the wall thickness of the aligned hollow shaped article has developed a flat blow molding machine capable of molding (Tokuoyake Sho 63-38285, etc.).

[0005]

However, in the conventional flat blow molding machine, the function of changing the width of the extruded parison was not provided. There is no choice but to perform burring molding with a mold. That is, the burr rate increases,
It is uneconomical.

An object of the present invention, which has been made in view of the above circumstances, is to provide a flat blow molding apparatus capable of changing the width of a flat parison extruded from the apparatus.

[0007]

In order to achieve the above object, the present invention provides a flat blow molding apparatus for extruding a hollow flat parison from a gap between a flat core and a flat die surrounding the flat core. The invention is characterized in that both ends of the die are slidably provided in the width direction with respect to the center thereof, and the core is replaceable in accordance with expansion and contraction of the die in the width direction.

[0008] The flat core is composed of a flat plate-like exchange portion arranged at the center and a curved non-exchange portion arranged at both ends, and only this exchange portion is adapted to the expansion and contraction of the die in the width direction. May be replaced.

[0009]

According to the above construction, both ends of the die are slid in the width direction, and the core is appropriately replaced according to the expansion and contraction of the die in the width direction, whereby the die is extruded from the gap between the core and the die. The width change of the hollow flat parison is achieved.

[0010] Further, the flat core is composed of a flat exchange part and a curved non-exchange part, and if only this exchange part is replaced, only the flat exchange part which requires no processing cost can be lengthened. Since it is sufficient to prepare a plurality of pieces with different sizes, the cost is reduced.

[0011]

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

FIG. 2 is a front view of the flat blow molding apparatus 1.
FIG. 3 shows a side view thereof. As shown in the figure, a flat accumulator chamber 3 having a width X and a thickness Y is formed in a flat main body 2. In this accumulator chamber 3, two accumulator chambers 3 are provided on the left and right in the thickness Y direction. Extruders 4a,
The plasticized resin is supplied from 4b. The extruders 4a and 4b may be provided as a single unit, and the resin may be distributed to the accumulator chamber 3 through a distribution valve (not shown).

In the accumulator chamber 3, a flat plunger 5 which is freely slidable in the vertical direction is accommodated. The plunger 5 is connected via an intermediate member 6 to a hydraulic cylinder 7 provided above the main body 2. According to this configuration, by expanding and contracting the hydraulic cylinder 7, the plunger 5 slides vertically in the accumulator chamber 3 to compress the resin.

A flat hole 8 is formed in the plunger 5 in a vertical direction, and a flat mandrel 9 is inserted into the hole 8. The upper end of the mandrel 9 is connected via an intermediate member 10 to an actuator 11 above the main body.
(Cylinder mechanism), and a flat core 12 is attached to the lower end of the mandrel 9. A flat die 13 is provided around the flat core 12 at predetermined intervals so as to surround the die. This die 1
3 is attached to the lower end of the main body 2 by a plate 15 via a holder 14.

According to this configuration, when the plunger 5 compresses the resin in the accumulator chamber 3, the pressurized resin is pushed out as a flat parison 16 from the gap between the flat die 13 and the flat core 12. At this time, if the gap between the core 9 and the die 13 is adjusted by operating the actuator 11 in the vertical direction, the thickness of the extruded flat parison 16 in the extrusion direction can be controlled.

Next, the flat die 13 which is the gist of the present embodiment is described.
The details of the flat core 12 will be described with reference to FIG. 1A is a front sectional view of the flat die 13 and the flat core 12, FIG. 1B is a side sectional view, and FIG. 1C is a bottom view.

As shown in FIG. 1C, the flat die 13
Consists of a central straight portion 13a and corner portions 13b at both ends. The straight portion 13a is configured by arranging two flat blocks 17 in parallel at a predetermined interval, and the corner portion 13b is formed by a slide piece 18 slidably sandwiched between the flat blocks 17. Has become. The slide piece 18 has a concave curved portion 18 a, and the actuator 1 supported by the die holder 14.
It is slid in the width direction by 9 (hydraulic cylinder).
In this embodiment, a hydraulic cylinder is employed as the actuator 19, but the actuator 19 is not limited to this, and may be a step motor or a feed screw mechanism 19a as shown in FIG. In either case, the slide piece 18 is freely moved in the width direction by the actuator 19 and is fixed at an arbitrary position.

On the other hand, as shown in FIGS. 1 (a) and 1 (c), the core 12 comprises a flat exchange part 12b arranged at the center and a curved non-exchange part 12a arranged at both ends. Have been. The exchange part 12b is a plate-shaped member formed to have the same thickness as the thickness of the plate-shaped mandrel 9, and the non-exchange part 12a has a convex curved part 12c corresponding to the concave curved part 18a of the slide piece 18. It is a member. The exchange portion 12b and the non-exchange portion 12a are attached to the lower end of the flat mandrel 9 from below by bolts 20, respectively. This is shown in FIG. As shown
The connecting portion 21 between the lower end of the flat plate-shaped mandrel 9 and the upper end of the core 12 (exchange portion 12b and non-exchange portion 12a) is formed with an intaglio groove so that the positioning thereof can be performed accurately. Instead of the usual hexagonal head bolt 20, a hexagonal hole bolt may be used.

In this embodiment, the flat die 13
Non-exchange portion 12a between the slide piece 18 and the flat core 12
Are formed with the concave curved portion 18a and the convex curved portion 12c, respectively.
In consideration of the swelling of the swelling 6, it may be a wavy curved portion with a concave center as shown in FIG. 6. According to this configuration,
When air is injected, the recessed central portion swells appropriately and the outer surface of the parison 16 comes into contact with the inner wall of the mold almost simultaneously, so that the thickness of the molded product can be made uniform.

The operation of this embodiment having the above configuration will be described.

According to the present apparatus 1, the flat parison 16 is extruded from the gap between the flat die 13 and the flat core 12, as shown in FIGS.

When narrowing the width of the flat parison 16, first, the flat core 12 is attached to the tip of the flat mandrel 9.
(The exchange part 12b and the non-exchange part 12a) are removed, and the exchange part 12b and the non-exchange part 12 are removed.
a is removed from the mandrel 9. Next, one or both of the right and left slide pieces 18 of the flat die 13 are slid by the actuator 19 so as to approach each other, and the width of the flat die 13 is reduced. Then, a new replacement part 12b matching the width of the narrowed flat die 13 is attached to the tip of the plate-shaped mandrel 9 with a bolt 20,
The non-replacement portion 12a previously removed on both sides is
Attach by. To expand the width of the flat parison 16 from this state, the opposite operation may be performed.

By this operation, the width of the hollow flat parison 16 extruded from the gap between the flat die 13 and the flat core 12 can be changed.

In the present embodiment, the core 12
Is composed of a central replacement part 12b and non-replacement parts 12a at both ends, and only this replacement part 12b is replaced, so that only the linear (plate-like) replacement part 12b, which does not require machining cost, has a different length. It is only necessary to prepare a plurality of them, and the cost is low.

If the flat core 12 is moved up and down through the mandrel 9 by moving the actuator 11 forward and backward by a signal from a gap setting device (not shown) during the injection of the flat parison 16, the gap between the core 12 and the die 13 is increased. gap)
And the thickness profile of the flat parison 16 in the injection direction (longitudinal direction) can be adjusted. Similarly, during the injection of the flat parison 16, the width profile of the flat parison 16 can be adjusted by moving the actuator 19 forward or backward by another signal of the gap setting device to appropriately move the slide piece 18. Becomes

[0026]

As described above, according to the present invention, the width of the hollow flat parison extruded from the gap between the flat core and the flat die can be changed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a main part of a flat blow molding apparatus as one embodiment of the present invention, in which (a) is a front sectional view, (b) is a side sectional view, and (c) is a bottom view.

FIG. 2 is a partially sectional front view of the flat blow molding apparatus.

FIG. 3 is a partial sectional side view of the flat blow molding apparatus.

FIG. 4 is a view showing a state in which a flat core is attached to a tip of a mandrel.

FIG. 5 is a view showing a modification of an actuator for sliding a slide piece of a flat die.

FIG. 6 is a view showing a modified example of both ends of a flat core and a flat die.

FIG. 7 is an explanatory view of a flat blow molding apparatus showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat blow molding apparatus 12 Flat core 12a Non-exchange part 12b Exchange part 13 Flat die 13a Straight part 13b as a center part 13b Corner part as both ends

Continuation of the front page (72) Inventor Yoshiharu Shitara 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the Technical Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd. Ishikawajima-Harima Heavy Industries, Ltd. Technical Research Institute (56) References JP-U 4-113911 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 49/00-49/80 B29B 11/00-11/14 B29C 33/76

Claims (2)

(57) [Claims] 1. A flat blow molding apparatus in which a hollow flat parison is extruded from a gap between a flat core and a flat die surrounding the flat core. Wherein the core is replaceable in accordance with expansion and contraction of the die in the width direction. 2. The flat core according to claim 1, wherein the flat core is composed of a plate-shaped exchange portion disposed at the center and a curved non-exchange portion disposed at both ends. 2. The flat blow molding apparatus according to claim 1, wherein the flat blow molding apparatus is replaced when necessary.