JP2000210979A - Injection molding machine for composite materials - Google Patents

Abstract

(57) [Problem] To provide an injection molding machine for composite materials which can be obtained at a low cost and in a short time from a standard injection molding machine. SOLUTION: In a standard injection molding machine provided with a first injection device (1) corresponding to a fixed platen (31) of a mold clamping device (30), a bed ( 4
A cantilever-like mount (25) extending backward from the space above 0)
And a second injection device (1) is mounted on the pedestal (25).
0) is provided. Further, a bracket (21) provided with a seat for an unloader or the like is attached to the upper surface of the fixed board (31).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping device comprising a fixed plate fixed to a bed, a movable plate forming a pair with the fixed plate, a heating cylinder, and an axial direction and a rotational direction in the heating cylinder. And a standard injection molding machine in which the injection device is provided corresponding to the fixed plate of the mold clamping device, and another injection device. The present invention relates to a composite material injection molding machine additionally provided.

[0002]

2. Description of the Related Art Injection molding machines are well known in the art, not to mention the name of the literature, and are generally composed of a mold clamping device and an injection device. The mold clamping device is composed of a fixed plate fixed to the bed, a fixed die mounted on the fixed plate, a movable plate forming a pair with the fixed plate, a movable die mounted on the movable plate, and the like. The injection device includes a heating cylinder, a screw provided in the heating cylinder so as to be drivable in the axial direction and the rotation direction, a hydraulic or electric motor for driving the screw, and the like. The injection device is provided on the bed so as to be movable in the axial direction. In a standard injection molding machine including such a mold clamping device and an injection device, one injection device is provided corresponding to a fixed plate of the mold clamping device. Therefore, the molding material can be kneaded and melted by rotating and driving the screw of the injection device and measured in the accumulation chamber in front of the heating cylinder. Next, the screw is driven in the axial direction to inject the measured molten molding material into the mold cavity of the mold clamping device, and after cooling and solidification, the movable platen is opened to obtain a molded product.

[0003] By the way, various injection molding methods for molding a complicated molded product by applying the above standard injection molding method have been proposed. For example, a core back method is known as one of the molding methods of molded articles made of different materials such as hard materials and soft materials or different materials. As a method of forming a hollow molded article by primary molding and secondary molding, a die slide method is known.

[0004] The core back method comprises primary molding and secondary molding. At the time of the primary molding, a part of the cavity is closed with a moving core, and a vacant cavity is injected and filled with a molten resin. A method of molding a primary semi-molded product, retracting the moving core at the time of the secondary molding, and injecting the molten resin into the retracted space to obtain a molded product integrated with the primary semi-molded product. A molded article of a material or a different color material can be obtained. According to the same principle, a multilayer or multicolor molded article can be obtained by multiple injections. A die slide method is also well known in the art, and a fixed die and a slide die are used for implementing this method, as proposed by the present applicant, for example, in Japanese Patent Application Laid-Open No. 62-87315. Then, for example, one primary semi-hollow molded product is molded on the upper parting line surface of these dies, and the other primary semi-hollow molded product is molded on the lower parting line surface. ing. Therefore, in the primary molding, the slide mold is set to the first position, and a pair of primary semi-hollow molded articles are molded by these molds so as to have an abutting portion around the opening, and after being solidified, the slide is formed. When the mold is opened, one primary semi-hollow molded article remains on the stationary mold and the other primary semi-hollow molded article remains on the slide mold. Then, when the slide mold is slid to the second position and the butted portions of the pair of primary semi-hollow molded products are butted, and then the molten resin for joining is injected into the butted portions in the secondary molding, a pair of primary semi-hollow moldings is formed. The molded products are joined at the abutting portion to form a hollow molded product.

[0005] As is clear from the above description, the injection molding method for molding such a complicated molded product requires the following:
For example, since the two-color molding method requires two injection devices corresponding to each color, standard injection molding in which one injection device is provided corresponding to the fixed plate of the mold clamping device. The machine cannot be used as it is. Therefore, a dedicated injection molding machine in which two injection devices are mounted on one bed is provided. However, a dedicated injection molding machine has to be specially designed from the beginning, and the production cost is high. Therefore, a second injection device is added to an existing standard injection molding machine. ing. That is, as shown in FIG. 2A, the second injection device B is set at a predetermined angle with respect to the existing first injection device A provided at the center of the axis of the bed d. It is also being expanded. Note that, in FIG. 2A, other symbols C, C
Denotes a heating cylinder, K and K denote hydraulic or electric drive units, respectively, and other symbols d, e, f and h
Indicates a bed, a fixed plate, a fixed mold, a movable mold, and a movable plate, respectively. Further, a portion D indicated by hatching indicates a new bed provided for adding the second injection device B.

Further, as shown in FIG. 2B, the existing first injection device A provided at the center of the bed d is moved to the side, and the moved first injection device A is moved. The second injection device B is also arranged in parallel with the injection device A. Note that members similar to those shown in FIG. 2A are denoted by the same reference numerals, and will not be described repeatedly.

[0007]

Problems to be solved by the invention FIG.
As shown in (b), when the second injection device B is provided in an existing injection device or a standard injection device, the cost can be reduced to some extent as compared with the case of designing and manufacturing a completely new device. And the delivery time of the product can be shortened. However, in terms of cost,
Also, the delivery date is not always satisfactory. That is, in the example shown in FIG. 2A, the bed D must be newly designed and manufactured. However, since this bed D is provided on the same plane as the existing bed d,
The design and manufacturing costs for securing that space are high. Further, in the example shown in FIG. 2B, the moving cost of the existing first injection device A,
The cost of piping or wiring associated with the movement is large, and the cost is not necessarily reduced as compared with the case of newly designing and manufacturing. The present invention seeks to provide a composite material injection molding machine that has solved the above-described problems such as the conventional high cost or the number of production days.
It is an object of the present invention to provide an injection molding machine for a composite material which can be obtained inexpensively and in a short time from an existing injection molding machine or a designed standard injection molding machine.

[0008]

According to the present invention, in order to achieve the above-mentioned object, a cantilever-like base extending rearward in the space above the bed is mounted on a fixed plate, and an injection device for expanding is provided on the base. Is provided so as to be movable in the axial direction. That is, the present invention, in order to achieve the above object,
A mold clamping device comprising a fixed plate fixed to the bed and a movable plate forming a pair with the fixed plate; a heating cylinder; and a screw provided in the heating cylinder so as to be driven in the axial direction and the rotational direction. An injection molding machine comprising: a standard injection molding machine in which the injection device is provided corresponding to the fixed platen of the mold clamping device; and another injection device is additionally provided. In the fixed plate, a cantilever-like base extending rearward in the space above the bed is attached, and the other injection device is provided on the mount so as to be movable in an axial direction. I have. The invention according to claim 2 is a mold clamping device including a fixed plate fixed to the bed and a movable plate that forms a pair with the fixed plate, a heating cylinder, and an axial direction and a rotational direction in the heating cylinder. A standard injection molding machine, comprising an injection device comprising a drivable screw and two injection devices corresponding to the fixed plate of the mold clamping device. An injection molding machine further provided with an apparatus, wherein the fixed platen is provided with a cantilever-like base extending rearward in a space above the bed, and the additional injection apparatus is provided. , Are provided on the gantry so as to be movable in the axial direction. According to a third aspect of the present invention, an upper portion of the fixing plate according to the first or second aspect further includes:
The invention according to claim 4, wherein a bracket provided with a seat for the unloader is mounted, and the additionally provided injection device is arranged so that a tip end portion thereof goes under the bracket. The bracket according to claim 3 is integrated with the gantry.

[0009]

Embodiments of the present invention will be described below. FIG. 1 is a side view showing an embodiment of the present invention. As shown in FIG. 1, an injection molding machine for a composite material according to the present embodiment is mounted on a table 41 of a bed 40 in an axial direction. 1st injection device 1 movably provided in
And a second injection device 10 is added to a standard injection molding machine or an existing injection molding machine including a mold clamping device 30 provided corresponding to the first injection device 1. It is composed of shapes. In the present embodiment, the second
The injection device 10 is provided above the first injection device 1 at a predetermined interval.

As is well known, the first injection device 1 includes a heating cylinder 2, an injection nozzle 3 provided in front of the heating cylinder 2, a driving device 4 disposed behind the heating cylinder 2, and the like. It is configured. Then, a screw provided in the heating cylinder 2 is driven in an axial direction and a rotating direction by a driving device 4 including a hydraulic pressure or an electric motor. As is well known in the art, the mold clamping device 30 also includes a fixed platen 3 fixed on a bed 40.
1. a movable plate 34 provided to be drivable in the mold opening direction and the mold closing direction with respect to the fixed plate 31; and fixed molds 3 attached to the fixed plate 31 and the movable plate 34, respectively.
2. It comprises a movable mold 33 and the like.

According to the present embodiment, a plurality of female screws are formed on the upper surface of the fixed platen 31 of the mold clamping device 30 of the basic or standard injection molding machine as described above by tapping. It is formed. The support member 20 including the bracket 21 and the pedestal 25 is attached using these female screws. The bracket 21 has a gate shape when viewed from the front. The two legs 22 (22) are fixed to the upper surface of the fixed platen 31 by bolts 23, 23,. As described above, since the bracket 21 has a gate shape, the distal end of the second injection device 10 is
Below and touch the fixed mold 32.
According to the present embodiment, the fixed platen 3 for attaching the unloading machine for unloading the molded product to the bracket 21 is also provided.
A seat similar to the seat formed on the upper surface is formed.

The pedestal 25 of the support member 20 has a boss 26
And an arm 27 extending rearward from the boss 26 at a predetermined upward gradient. Boss part 2
Reference numeral 6 includes a vertically-contact portion having a predetermined length in the vertical direction which presses against the side surface of the fixed platen 31 at the time of mounting, and a support portion which rides on the upper surface of the fixed platen 31. According to the present embodiment, the support portion and, for example, the leg portion 22 of the bracket 21 are integrated in advance by welding or the like. Therefore, when the bracket 21 is mounted on the upper surface of the fixed board 31 as described above, the gantry 25 is also mounted at the same time. The second injection device 10 is provided on the arm 27 via the base 15 so as to be movable in the axial direction. The arm 27 is
As described above, since the slope is raised toward the rear, a predetermined space is secured below the slope, and the first injection device 1 is not obstructed.

The second injection device 10 also includes a heating cylinder 12, an injection nozzle 13 provided in front of the heating cylinder 12, a driving device 14 disposed behind the heating cylinder 12, and the like, as is well known in the art. It is configured. And a driving device 14 comprising a hydraulic or electric motor or the like.
Thereby, the screw in the heating cylinder 12 is driven in the axial direction and the rotation direction. In addition, the second
The injection device 10 is driven in the axial direction by a hydraulic cylinder 16 having one end attached to a support member 20.

Although an example of molding of the injection molding machine for a composite material configured as described above will not be described, the present molding machine is also provided with the first and second injection devices 1 and 10, so that FIG. It is obvious that a two-color molded product or a molded product of a different material can be obtained by attaching predetermined molds 32 and 33, similarly to the conventional injection machine shown in FIG.
It is also apparent that a hollow molded article can be obtained by exchanging the molds 32 and 33.

The present invention can be implemented without being limited to the above embodiment. For example, in the above description, the first injection device 1 and the mold clamping device 30 already exist, and it has been described that the second injection device 10 is provided in this existing standard injection molding machine. The entire injection molding machine for composite materials described can be newly designed and manufactured. Even if it is carried out in this manner, the arm portion 27 is inclined upward toward the rear, so that there is an advantage that the space can be effectively used as compared with the conventional one, and the second injection device 10 is provided. However, since a seat is also formed on the bracket 21, an unloader or the like can be attached to the bracket 21, so that a conventional unloader or the like can be used.
In the above-described embodiment, one second injection device 10 is provided for one first injection device 1.
It is also clear that the number of injection devices is not limited to these numbers. For example, a three-color injection molding machine can be configured by providing a third injection device as described above in a space above a two-color injection molding machine in which two first and second injection devices are arranged in parallel. Is also clear. At this time, it is clear that the injection device can be constituted by a hydraulic injection machine, or an electric injection machine, or can be implemented by appropriately combining these.

[0016]

As described above, according to the present invention, the space above the bed is moved backward on the fixed plate of a standard injection molding machine provided with an injection device corresponding to the fixed plate of the mold clamping device. An extended cantilever-like mount is attached, and an injection device additionally provided on this mount is provided so as to be movable in the axial direction. Therefore, a new injection device is added to a standard injection molding machine. By simply adding, an injection molding machine for composite materials can be provided at low cost. In addition, the delivery time can be shortened because only a new injection device is added to the designed standard injection molding machine. Furthermore, an existing injection molding machine can be easily converted to a composite material injection molding machine.
At this time, since the gantry extends rearward in the space above the bed like a cantilever, there is also obtained an advantage that the space is effectively used. According to the invention in which the bracket provided with the seat for the unloader is mounted on the upper portion of the fixed board, in addition to the above-described effects, there is obtained an advantage that the unloader for unloading the molded product can be mounted on the bracket. . According to the invention in which the bracket is integrated with the gantry, the standard injection molding machine can be easily converted to a composite material injection molding machine at the delivery destination by integrally manufacturing the bracket and the gantry at the factory. An effect that can be modified is obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention in a partial cross section.

FIG. 2 is a view showing a conventional example, and (a) and (b) are plan views showing different conventional examples.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st injection apparatus 10 2nd
Injection device 20 Support member 21 Bracket 25 Mount 30 Mold clamping device 31 Fixing plate

Claims (4)

[Claims] 1. A mold clamping device comprising a fixed plate fixed to a bed and a movable plate forming a pair with the fixed plate, a heating cylinder, and a driving cylinder provided in the heating cylinder so as to be driven in an axial direction and a rotating direction. And a standard injection molding machine in which the injection device is provided corresponding to the fixed platen of the mold clamping device, and another injection device is additionally provided. An injection molding machine, wherein the fixed platen is provided with a cantilever-like base extending rearward in the space above the bed, and the other injection device is
An injection molding machine for a composite material, wherein the injection molding machine is provided on the mount so as to be movable in an axial direction. 2. A mold clamping device comprising a fixed plate fixed to a bed and a movable plate forming a pair with the fixed plate, a heating cylinder, and a driving cylinder provided in the heating cylinder so as to be driven in an axial direction and a rotating direction. And a standard injection molding machine in which two injection devices are provided corresponding to the fixed plate of the mold clamping device, and one injection device is additionally provided. An injection molding machine provided at the fixed platen, a cantilever-like gantry extending backward in the space above the bed is attached to the fixed platen, the additional injection device is mounted on the gantry An injection molding machine for a composite material, wherein the injection molding machine is provided so as to be movable in the axial direction. 3. A bracket provided with a seat for an unloader is attached to an upper portion of the fixed plate according to claim 1 or 2, and a tip of an additional injection device is provided. An injection molding machine for a composite material arranged so as to go under the bracket. 4. An injection molding machine for a composite material, wherein the bracket according to claim 3 is integrated with a gantry.