JP3361389B2 - Injection molding method and apparatus - Google Patents

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.

An upper movable plate 7 having an upper die 6 on a lower surface 7a is provided on the three tie bars 5 vertically provided on the fixed plate 1 so as to be vertically movable along an arrow A. The nozzle 8a of the injection cylinder 8 can be brought into contact with the nozzle receiving portion 7b formed in the center of the movable platen 7.

Next, the operation will be described. In the above-mentioned configuration, the upper movable plate 7 is lowered, 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. A molded product can be obtained by cooling and 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 upper 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. The injection molding machine must be used, or the molds must be replaced by one injection molding machine to perform molding, which complicates the molding operation. In particular, as in recent years, when it comes to production of a wide variety of products and small lots, such a conventional method takes time for molding work, and it becomes difficult to reduce the cost of molded products.
The equipment cost increased, which 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 upper movable platen is lowered and clamped to the lower mold on the fixed platen, and injection molding is performed by an injection cylinder. In the molding method, a plurality of upper molds provided on the slide table of the upper movable platen and a plurality of lower molds provided on the rotary table on the fixed platen are combined to perform alternating or continuous molding.

The injection molding apparatus according to the present invention is an injection molding apparatus in which an upper mold on the upper movable platen is lowered and clamped to a lower mold on the fixed platen, and injection molding is performed by an injection cylinder. The slide table is provided on a movable plate and has a plurality of upper molds, and the rotary table is provided on the fixed plate and has a plurality of lower molds.

[0009]

In the injection molding method and apparatus according to the present invention, the slide table provided on the lower surface of the upper movable plate,
Attach multiple upper molds with different cavity shapes,
On the rotary table of the fixed plate, attach the lower mold corresponding to each upper mold, move the slide table and the rotary table, and select the corresponding upper mold and lower mold,
It is possible to perform injection molding of a molded product by lowering the upper movable platen, performing mold clamping, and performing injection from the injection cylinder. 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.

[0010]

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.

An upper movable plate having a slide table 20 having a plurality of upper molds 6 and 6A having different cavities 6a on the lower surface 7a on three tie bars 5 vertically provided on the fixed plate 1. 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 the nozzle receiving portion 7b formed at the center of the upper movable plate 7.

As shown in FIG. 2, the upper molds 6 and 6A provided on the slide table 20 can move reciprocally along a slide direction C indicated by an arrow C of the slide table 20 so that the upper movable plate 7 can move. It is operated by the rod 21a of the slide table actuator 21 provided on the lower surface 7a. The slide table 20 is slidably provided via a well-known rail (not shown) formed on the upper movable plate 7.

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 and the upper movable platen 7 is lowered through a driving means (not shown) in the mold open state shown in FIG. Injection molding is performed by injecting and supplying the molten resin from the injection cylinder 8 into 6a and 4a.

Thereafter, the upper 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. In addition, by moving the slide table 20 and the rotary table 3 in the mold open state described above, it is possible to move the slide table 20 and the rotary table 3 so that the upper mold 6A and the lower mold 4A having different cavities 4a and 6a are opposed to each other. By performing the same injection molding operation, it is possible to perform alternate molding in which a molded product having a shape different from that described above is injection molded.

The sliding and rotating operations and configurations of the slide table 20 and the rotary table 3 described above are merely examples, and the same operation can be performed by using other well-known mechanisms. It is possible to obtain the same effect as the above.

[0016]

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 configuration diagram showing a mold open state of an injection molding apparatus according to the present invention.

FIG. 2 is a plan view of FIG.

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

[Explanation of symbols]

1 Fixed board 3 rotary table 4,4A lower mold 6,6A upper mold 7 Upper movable plate 8 injection cylinders 20 slide table

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 45/06 B29C 45/12

Claims (2)

(57) [Claims] 1. The upper mold (6) side of the upper movable plate (7) is lowered and clamped to the lower mold (4) side of the fixed plate (1), and injection molding is performed by the injection cylinder (8). In the injection molding method, the plurality of upper molds (6, 6A) provided on the slide table (20) of the upper movable plate (7) and the rotary table (3) on the fixed plate (1) are provided. An injection molding method characterized in that a plurality of lower molds (4, 4A) are combined and alternately or continuously molded. 2. The upper mold (6) side of the upper movable plate (7) is lowered and clamped to the lower mold (4) side of the fixed plate (1), and injection molding is performed by the injection cylinder (8). In the injection molding device described above, a slide table (20) provided on the upper movable plate (7) and having a plurality of the upper molds (6, 6A), and a plurality of the lower tables provided on the fixed plate (1). An injection molding device comprising a rotary table (3) having a mold (4, 4A).