JPH08142101A - Method and apparatus for injection molding - Google Patents

Abstract

PURPOSE: To mold two or more kinds of molded bodies alternately or continuously by one vertical type injection molding machine by using one or more kinds of dies by selectively combining a plurality of upper dies, which are fixed to the rocking plate of a movable board, and a plurality of lower dies, which are fixed to the rotary table on a fixed board. CONSTITUTION: A plurality of lower dies 4 and 4A, whose shapes of cavities 4a are different to each other, are provided on a rotary table 3 on a fixed board 1. A movable board 7 is provided on three tie bars 5, which are vertically provided on the fixed board 1, so that the movable board 7 is freely moved up and down. The movable board 7 has a rocking plate 20 having a plurality of upper dies 6 and 6A, wherein the shapes of the cavities 6a are different to each other, at a lower surface 7a. Each of the upper dies 6 and 6A, which are provided on the rocking plate 20, can be reciprocated along the rocking direction of the rocking plate 20. Then, a plurality of the upper dies 6 and 6A, which are fixed to the rocking plate 20 of the movable board 7, and a plurality of the lower dies 4 and 4A, which are fixed to the rotary table 3 on the fixed board 1, are selectively combined, and the molded bodies are alternately or continuously molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method and apparatus, and more particularly to molding a plurality of types of molded products alternately or continuously by using a plurality of types of molds by one vertical injection molding machine. For new improvements for.

[0002]

2. Description of the Related Art As a vertical injection molding machine of this type that has been generally adopted in the past, for example, the structure shown in FIG. 3 can be cited. That is, the reference numeral 1 in FIG. 3 is a fixed plate provided on the bed 2, and the lower die 4 is arranged on the rotary table 3 on the fixed plate 1.

A movable plate 7 having an upper die 6 on a lower surface 7a is provided on three tie bars 5 which are vertically provided on the fixed plate 1.
Is provided so as to be movable up and down along the arrow A.
The injection cylinder 8 is attached to the nozzle receiving portion 7b formed in the center of the
The nozzle 8a is configured to be able to contact.

Next, the operation will be described. In the above configuration, the movable platen 7 is lowered, and the upper mold 6 and the lower mold 4 are clamped, and then the molten resin is injected into the cavities 4a, 6a between the molds 6 and 4 by the injection cylinder 8 and cooled. A molded product can be obtained by solidifying.

[0005]

Since the conventional vertical injection molding machine is configured as described above, the following problems exist. That is, since the upper mold is fixed to the movable plate and the lower mold is directly provided on the rotary table or on the fixed plate, in order to alternately or continuously form a plurality of types of molded products, a plurality of units are required. It is necessary to use an injection molding machine or replace the mold with a single injection molding machine for molding, which complicates the molding work.
In particular, as in recent years, when it comes to production of a wide variety of products in a small lot, such a conventional method takes time for molding work, makes it difficult to reduce the cost of the molded product, and increases the equipment cost, It was a heavy burden on the molding company.

The present invention has been made to solve the above problems, and in particular, a plurality of types of molded articles are alternately or continuously used by using one type of vertical injection molding machine and a plurality of types of molds. It is an object of the present invention to provide an injection molding method and apparatus that are designed to be molded.

[0007]

In the injection molding method according to the present invention, the upper mold on the movable platen side is lowered, the lower mold on the fixed platen side is clamped, and injection molding is performed by an injection cylinder. In the method, a plurality of upper molds fixed to a swing plate of the movable plate and a plurality of lower molds fixed to a rotary table on the fixed plate are selectively combined to perform alternating or continuous molding. .

In the injection molding apparatus according to the present invention, the upper mold on the movable platen side is lowered and clamped to the lower mold on the fixed platen, and injection molding is performed by an injection cylinder. And a rotary table provided on the fixed plate and having a plurality of lower molds.

More specifically, the rotary table is configured to be repeatedly rotated by 180 °.

[0010]

In the injection molding method and apparatus according to the present invention, a plurality of upper molds having cavity shapes different from each other are attached to the rocking plate provided on the lower surface of the movable plate, and further, on the rotary table of the fixed plate, The lower mold corresponding to each of the upper molds is attached, the rocking plate and the rotary table are rotationally moved to select the corresponding upper mold and lower mold, and the movable plate is lowered to perform mold clamping, and the injection cylinder is removed. The injection molding of the molded article can be performed by performing the injection of. Further, continuous injection molding can be performed by continuously using the upper mold and the lower mold selected once, and alternate injection molding can be performed by moving the upper mold and the lower mold each time. Further, the lower die can be replaced by repeatedly rotating the rotary table by 180 °.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the injection molding method and apparatus according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example are designated by the same reference numerals for description. In FIG. 1 and FIG. 2, reference numeral 1 is a fixed plate provided on the bed 2. On the rotary table 3 on the fixed plate 1, a plurality of lower molds 4 having different cavities 4a are formed. , 4A are provided. It should be noted that this rotary table 3 is
It is configured in an 80 ° repetitive rotation type. In addition, this 180
As described above, the configuration of the repeated rotation type is a case where the molds are two sets of upper and lower sets, and for example, when there are three sets of molds, it is a 120 ° repeated rotation type and can be arbitrarily changed.

On the three tie bars 5 provided vertically on the fixed platen 1, a movable platen having a lower plate 7a having a rocking plate 20 having a plurality of upper molds 6 and 6A having different cavities 6a. 7 is provided so as to be vertically movable along the arrow A, and the nozzle 8a of the injection cylinder 8 can be brought into contact with a nozzle receiving portion 7b formed at the center of the movable plate 7.

Upper molds 6, 6 provided on the rocking plate 20
As shown in FIG. 1, A is a pinion gear provided on a shaft 31 of a hydraulic motor 30 provided on the movable plate 7 so as to be capable of reciprocating along an oscillating direction C indicated by an arrow C on the oscillating plate 20. 32 is configured to swing the swing plate 20 by driving the swing plate drive gear 35 of the swing plate 20, so that the hydraulic motor 30 (which may be an electric motor) is reciprocally rotated. Is configured. The oscillating plate 20 is swingably provided in the direction of arrow C by a bearing 40 provided on the tie bar 5 provided at the center of each tie bar 5.

Next, the operation will be described. First, FIG.
When the upper mold 6 and the lower mold 4 face each other at the mold clamping position K (shown in FIG. 1) and the movable platen 7 is lowered by a well-known driving means (not shown) in the mold open state shown in FIG. The mold 4 is clamped, and injection molding is performed by injecting and supplying molten resin from the injection cylinder 8 into the cavities 6a and 4a.

Thereafter, the movable platen 7 is lifted and the mold is opened to take out the molded product. By repeating this operation, continuous injection molding can be carried out using the same mold. Also, in the mold open state described above,
By moving the oscillating plate 20 and the rotary table 3, the same injection molding operation as described above is performed with the upper mold 6A and the lower mold 4A having the cavities 4a and 6a different in shape from the above, being opposed to each other. Thus, it is possible to perform alternate molding in which a molded product having a shape different from that described above is injection-molded.

The swinging and rotating operations and configurations of the rocking plate 20 and the rotary table 3 described above are merely examples, and similar operations may be performed using other known mechanisms. It is possible to obtain the same effect as the above.

[0017]

The injection molding method and apparatus according to the present invention are
Since it is configured as described above, the following effects can be obtained. That is, since the upper mold and the lower mold can be freely moved and replaced, a plurality of types of molded products can be molded alternately or continuously by one injection molding machine, so that the increase in the equipment cost of the injection molding machine can be suppressed. At the same time, the productivity of injection molding in high-mix low-volume production can be significantly improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an injection molding apparatus according to the present invention.

FIG. 2 is a configuration diagram showing a mold open state seen from the Y direction in FIG.

FIG. 3 is a configuration diagram showing a mold open state of a conventional injection molding apparatus.

[Explanation of symbols]

 1 Fixed plate 3 Rotary table 4, 4A Lower mold 6, 6A Upper mold 7 Movable plate 8 Injection cylinder 20 Swing plate

Claims (3)

[Claims] 1. An upper mold (6) on the movable plate (7) side is lowered and clamped to a lower mold (4) on the fixed plate (1) side, and injection molding is performed by an injection cylinder (8). In the injection molding method described above, the plurality of upper molds (6, 6A) fixed to the rocking plate (20) of the movable plate (7) and the plurality of fixed to the rotary table (3) on the fixed plate (1). 2. An injection molding method, characterized in that the lower mold (4, 4A) is selectively combined and alternately or continuously molded. 2. An upper mold (6) on the movable plate (7) side is lowered and clamped to a lower mold (4) on the fixed plate (1) side, and injection molding is performed by an injection cylinder (8). In the injection molding device described above, a rocking plate provided on the movable plate (7) and having a plurality of the upper molds (6, 6A).
(20), and a plurality of the lower molds (4,
An injection molding device comprising: a rotary table (3) having 4A). 3. The rotary table (3) is 180 °
The injection molding apparatus according to claim 2, wherein the injection molding apparatus is configured to rotate repeatedly.