JPH04323014A - Vertical injection molder - Google Patents

Abstract

PURPOSE:To obtain a vertical injection molder, in which changing-over between insert molding and normal molding can be executed in a short period of time. CONSTITUTION:The vertical injection molder for insert molding is constituted by connecting a detachable lower mold changer 16 with a single acting vertical injection molder consisting of a mold clamping device 12 and an injection device 14. The lower mold changer 16 consists of a trestle 32, a slide table driving hydraulic cylinder 34 mounted on the trestle 32 and a slide table 36, which connects with the piston rod of the cylinder 34 and on which a lower mold 28 is mounted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical injection molding machine.

0002

2. Description of the Related Art A typical vertical injection molding machine includes a single-acting type as shown in FIG. The single-acting vertical injection molding machine shown here includes a mold clamping device 12 and an injection device 14 provided on a base 10. Mold clamping device 12
A fixed platen 18 fixed to the base 10, four tie bars 20 fixed to this, and an end frame 2 supported by the tie bars 20 at a position facing the fixed platen 18.
2, a movable platen 24 movably fitted to the tie bar 20, and a hydraulic cylinder 26 for driving the movable platen. One end of the piston rod 26a of the movable plate driving hydraulic cylinder 26 is fixed to the movable plate 24. Note that a lower mold 28 is fixed to the fixed platen 18, and an upper mold 30 is fixed to the movable platen 24. The injection device 14 is placed in the cavity of both molds 28 and 30 which are closed.
A molded article can be injection molded by injecting molten resin. However, this type of vertical injection molding machine has the problem that insert molding cannot be performed efficiently. Insert molding is a method in which an insert part is inserted into a mold during each molding process, the mold is closed and clamped, and then molten resin is injected into the mold to form a composite molded product. To do this, after completing the molding and taking out the molded product from the mold which was opened in the mold clamping device 12, the inserted parts are carried into the mold from outside the mold clamping device 12 and placed in a predetermined position. This poses a problem in that the structure of the transport device for transporting the inserted parts becomes complicated and automation becomes difficult. Therefore, for this purpose, a vertical injection molding machine for insert molding (also referred to as a "slide vertical injection molding machine") as shown in FIGS. 9 and 10 is used. A fixed platen 52 fixed to the base 10 extends to the outside of the mold clamping device 54, and has a groove 52a formed in the longitudinal direction thereof. A hydraulic cylinder 56 for driving the slide table is attached to the fixed plate 52 in a groove 52a thereof. A connecting portion 58a of a slide table 58 is connected to a piston rod 56a of a hydraulic cylinder 56 for driving the slide table. Guide fittings 60 for guiding both sides of the slide table 58 are attached to the fixed plate 52. By driving the slide table driving hydraulic cylinder 56, the slide table 58 is moved between the molding position shown in FIG. It is possible to move between A lower mold changer 50 is constituted by a fixed platen 52, a hydraulic cylinder 56 for driving a slide table, a slide table 58, and a guide fitting 60. That is, the fixed platen 52 also serves as a component of the mold clamping device 54 and the lower mold changer 50. This vertical injection molding machine for insert molding operates as follows. That is, as shown in FIG. 9, when the injection molding is completed and the mold is opened, the slide table driving hydraulic cylinder 56 is operated to move the slide table 58 as shown in the figure.
moved to the left. As a result, the lower mold 28 with the composite molded product attached thereto is pulled out of the mold clamping device 54. That is, the composite molded product is taken out at a working position where there are no obstructions such as the tie bars 20, and the inserted parts for the next composite molding are attached. Thereby, automation of insert molding can be facilitated.

0003

[Problems to be Solved by the Invention] However, with the conventional vertical injection molding machine as described above, it is difficult to switch from a single-acting vertical injection molding machine to a sliding vertical injection molding machine, and the molded product It is not possible to respond flexibly to different types and production methods. On the other hand, when designing and manufacturing a vertical injection molding machine, two types of parts are required: a single-acting type and a sliding type, making it impossible to standardize parts, and causing many problems in terms of manufacturing, inventory management, etc. There is a point. The present invention aims to solve these problems.

0004

[Means for Solving the Problems] The present invention solves the above problems by combining a single-acting vertical injection molding machine that performs normal molding with a lower mold changer that can be detached from the machine. That is, the vertical injection molding machine of the present invention includes a vertical mold clamping device (12), an injection device (14), and a lower mold changer (16).
12) is a fixed plate (18) fixed to the base (10).
, a tie bar (20) extending vertically from this, and an end frame (2) fixed to the upper end of the tie bar (20).
2), and a movable platen (2) which is movable guided by tie bars (20) and to which an upper mold (30) can be attached to the lower surface.
4), and a movable plate drive device (26) that is attached to the end frame (22) and can drive the movable platen (24) in the tie bar axial direction, and the lower mold changer (16).
The frame (32) is removably connected to the base (10).
), a hydraulic cylinder (34) for driving the slide table attached to this, and a piston rod (34a) of this
), and the height of the lower surface of the slide table (36) is the same as the height of the upper surface of the fixed platen (18) of the vertical mold clamping device (12). The slide table (36) is driven by a hydraulic cylinder (34) for driving the slide table to move the molding position inside the vertical mold clamping device (12) and the working position outside the vertical mold clamping device (12). If the lower mold changer (16) is connected to the base (10), the lower mold (28) can be moved between the slide table (36) and the lower mold changer (16).
) is installed, and the lower mold changer (1
6) is removed from the base (10),
The lower mold (28) is arranged to be attached to the fixed platen (18). Note that the symbols in parentheses indicate corresponding members in the embodiment.

[0005]

[Operation] When performing insert molding from a state where it was used as a single-acting vertical injection molding machine, by connecting the single-acting vertical injection molding machine and the lower mold changer,
Reconfigured into a vertical injection molding machine for insert molding. That is, remove the upper mold and lower mold for normal molding from both plates, fix the upper mold and lower mold for insert molding to the movable platen and the slide table of the lower mold changer, and then remove the upper mold and lower mold for insert molding from the lower mold changer. Connect the frame to the base of a single-acting vertical injection molding machine. This completes the preparation for insert molding.
Insert molding can be started in a short time. In addition, in order to change from a vertical injection molding machine for insert molding to a single-acting vertical injection molding machine, the mount of the lower mold changer is removed from the base and the upper mold and lower mold are replaced. That is, the upper mold and lower mold for insert molding are removed from the movable platen and the slide table of the lower mold changer, and the upper mold and lower mold for normal molding are attached to both plates. This allows it to be used as a single-acting vertical injection molding machine. In this case, since there is nothing around the base that would obstruct the use of the machine as a single-acting vertical injection molding machine, it is possible to use the standard molded product ejecting device without any problem. In addition, since there is no need to disassemble the mold clamping device, it is possible to reassemble from a single-acting vertical injection molding machine to a vertical injection molding machine for insert molding, and from a vertical injection molding machine for insert molding to a single-acting vertical injection molding machine. Reassembly work to the molding machine can be done in a short time.

[0006]

Embodiment FIGS. 1 to 3 show a first embodiment of the present invention. Figure 1
shows the assembled state as a vertical injection molding machine for insert molding. The lower mold changer 16 is shown in FIGS. 2 and 3. In FIG. 1, a mold clamping device 12 and an injection device 14 are provided on a base 10. The mold clamping device 12 is a base 1
0 fixed platen 18, four tie bars 20 extending vertically from this, an end frame 22 fixed to the upper end of the tie bars 20, a movable platen 24 movably fitted to the tie bars 20, and an end frame 20. It is composed of a hydraulic cylinder 26 for driving a movable platen attached to a frame 22. The end of the piston rod 26a of the movable plate driving hydraulic cylinder 26 is connected to the movable plate 24. An upper mold 30 is attached to the movable platen 24. Note that a lower mold 28 is attached to a slide table 36 of a lower mold changer 16, which will be described later. The movable platen 24 is moved by driving the hydraulic cylinder 26 for movable platen driving.
is movable between the illustrated mold opening position and a mold closing/clamping position below this. Both molds 28 and 30 are closed.
A cavity is formed by this. By injecting molten resin into the cavity from the injection device 14, it is possible to injection mold a molded product. base 1
A pedestal 32 is arranged adjacent to 0. The height of the top surface of the pedestal 32 is made equal to the height of the top surface of the fixed platen 18. The pedestal 32 is connected to the base 10 with a connecting fitting 40. A hydraulic cylinder 34 for driving the slide table is attached to the pedestal 32. The end of the piston rod 34a of the slide table driving hydraulic cylinder 34 is connected to the slide table 36. Frame 3
In FIG. 2, guide fittings 38 are provided on both left and right sides to guide the movement of the slide table 36. The guide fitting 38 extends above the fixed plate 18. By driving the slide table driving hydraulic cylinder 34, the slide table 36 can be moved between the molding position shown in FIG. 1 and the working position shown in FIG. 3 while being guided by the guide fitting 38. Note that in FIG. 1, illustration of the guide fitting 38 is omitted for clarity. Frame 3
2. The lower mold changer 16 is composed of a hydraulic cylinder 34 for driving a slide table, a slide table 36, and the like.

Next, the operation of this first embodiment will be explained. An insertion part (not shown) is attached to the lower mold 28 in advance. From the mold open state shown in FIG.
Mold closing and mold clamping are performed by moving 6a in the downward direction. That is, the upper mold 30 is fitted into the lower mold 28 to form a cavity. The injection cylinder 14a of the injection device 14 moves from the illustrated standby position to the left injection position, and molten resin is injected into the cavity from the nozzle of the injection cylinder 14a. Thereby, a composite molded article can be injection molded. After the molding is completed, the injection cylinder 14
A returns to the position shown in the figure, and the mold is cooled and opened. Next, by driving the slide table driving hydraulic cylinder 34, the slide table 36 and the lower mold 28 are
is moved to the working position shown in FIG. In the working position, the composite molded part is removed and the inserted parts are installed. Next, by driving the slide table driving hydraulic cylinder 34 in the opposite direction to that described above, the slide table 36 and the lower mold 28 are moved to the molding position shown in FIG. By repeating the above operations, composite molded products can be repeatedly molded using a vertical injection molding machine for insert molding. When used as a single-acting vertical injection molding machine, the vertical injection molding machine for insert molding is replaced with a single-acting vertical injection molding machine. That is, the lower mold changer 16 is removed from the vertical injection molding apparatus for insert molding by loosening the connecting fitting 40 from the state shown in FIG. The upper mold and the lower mold are fixed to the movable platen 24 and the fixed platen 18. This completes the preparation for normal molding. In this case, insert molding is not performed. In other words, the mold is closed and clamped without attaching any inserted parts to the lower mold 28. The injection cylinder 14a of the injection device 14 advances to the injection position, and molten resin is injected into the cavity. Thereby, a molded article can be formed. After the molding is completed, the injection cylinder 14 of the injection device 14
A returns to the standby position, and the mold is cooled and opened. The product is removed from the lower mold 28 by a product removal device (not shown). By repeating the above operations, molded products can be repeatedly molded using the single-acting vertical injection molding machine.

FIG. 4 shows a second embodiment of the present invention. Frame 3
Four wheels 40 for running on the floor are attached to the ground contact surface of No. 2. Other configurations are similar to those of the first embodiment. The operation of this second embodiment is as follows:
This is done in the same way as in the first embodiment, except that it can be easily moved when attaching and detaching. FIG. 5 shows a third embodiment of the present invention. This embodiment differs from the first embodiment in that the movement axis of the slide table 36 of the lower mold changer 16 is not parallel to the movement axis of the injection cylinder 14a of the injection device 14, but the two axes are perpendicular to each other. be. In addition, in FIG. 6, the arrangement shown in FIG.
The arrangement is shown when rotated. Thereby, the arrangement of the lower mold changer 16 can be selected depending on the surrounding situation. 5 and 6 show a state in which the slide table 36 is in the working position, and the hydraulic cylinder 26 for driving the movable platen of the mold clamping device 12, the end frame 22, the movable platen 24, and the upper mold 30 have been removed. It shows. FIG. 7 shows a fourth embodiment of the present invention. Two slide tables 36 and 37 are provided connected to each other by a connecting fitting 44. A lower mold 28 is provided on each of the slide tables 36 and 37. As a result, for example, while performing molding work using the lower mold 28 of one slide table 36, the work of taking out a composite molded product from the lower mold 28 of the other slide table 37 and the installation of inserted parts can be performed. It can be performed. Therefore, in this fourth embodiment, the cycle time of composite molding can be shortened.

[0009]

As explained above, according to the present invention, it is possible to switch between insert molding and normal molding in a short time. Since there is no need to separately provide a vertical injection molding machine for insert molding and a single-acting vertical injection molding machine, equipment costs can be reduced. In addition, from the standpoint of manufacturing injection molding machines, there is no need to separately produce vertical injection molding machines for insert molding and single-acting vertical injection molding machines, which shortens delivery times, reduces inventory, and reduces costs. reduction is possible.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing a vertical injection molding machine of the present invention.

FIG. 2 is a left side view of the lower mold changer.

FIG. 3 is a front view of the lower mold changer with the slide table cut in the longitudinal direction.

FIG. 4 is a diagram showing casters attached to the lower mold changer.

FIG. 5 is a diagram showing a different mounting arrangement of the lower mold changer.

6 is a diagram showing a case where the lower mold changer of FIG. 5 is rotated by 180 degrees and arranged; FIG.

FIG. 7 is a top view of a lower mold changer provided with two slide tables.

FIG. 8 is a diagram showing a conventional single-acting vertical injection molding machine.

FIG. 9 is a partial cross-sectional view of a conventional vertical injection molding machine for insert molding.

FIG. 10 is a partial cross-sectional view taken along line 10-10 in FIG. 9;

[Explanation of symbols]

10 Base 12 Mold clamping device 14 Injection device 16 Lower mold changer 18 Fixed platen 20 Tie bar 22 End frame 24 Movable platen 26 Hydraulic cylinder for movable platen drive (movable platen drive device)
28 Lower mold 32 Frame 34 Hydraulic cylinder 36 for driving the slide table
Slide table 37 Slide table 38 Guide fittings 42 Floor running wheels

Claims (4)

[Claims] Claim 1: Consisting of a vertical mold clamping device (12), an injection device (14), and a lower mold changer (16), the vertical mold clamping device (12) is attached to a base (10). It is movable by being guided by the fixed fixed platen (18), the tie bar (20) extending vertically from this, the end frame (22) fixed to the upper end of the tie bar (20), and the tie bar (20). Also, a movable platen (24) to which an upper mold (30) can be attached to the lower surface, and an end frame (22).
The lower mold changer (16) is removably connected to the base (10). It has a pedestal (32), a hydraulic cylinder (34) for driving a slide table attached to this, and a slide table (36) connected to its piston rod (34a). 36)
The height of the lower surface of the fixed platen (18) of the vertical mold clamping device (12) is
), and the slide table (36) is driven by a hydraulic cylinder (34) for driving the slide table to adjust the molding position and the vertical mold clamping position in the vertical mold clamping device (12). It is movable between working positions outside the device (12), and when the lower mold changer (16) is connected to the base (10), the slide table (
36) is arranged so that the lower mold (28) is attached to it,
When the lower mold changer (16) is removed from the base (10), the lower mold (28) is attached to the fixed platen (18).
A vertical injection molding machine that is arranged so that it can be installed. 2. The vertical injection molding machine according to claim 1, wherein the pedestal (32) has a guide fitting (38) for guiding movement of the slide table (36). 3. The vertical injection molding machine according to claim 1, wherein the pedestal (32) has wheels (42) for running on the floor. [Claim 4] Two slide tables (36 and 37
4. The vertical injection molding machine according to claim 1, 2 or 3, wherein the vertical injection molding machines are connected to each other.