JPH0885130A - Multiple injection molding machine - Google Patents

Abstract

PURPOSE: To simply and simultaneously mold a plurality of kinds of molded products by a general-purpose molding machine wherein the first fixed and movable molds respectively attached to one surface of an intermediate attaching plate, the second fixed and movable molds respectively attached to the other surface of the intermediate attaching plate and a movable attaching plate and first and second injection devices injecting a synthetic resin are provided. CONSTITUTION: Since rods 33 are supported in a slidable manner with respect to fixed and movable molds, a first fixed mold 21 and a first movable mold 25 and a second fixed mold 23 and a second movable mold 27 can be clamped. After the injection nozzle of a first injection device 11 is brought into contact with the sprue of the fixed mold 21 and the injection nozzle of a second injection device 37 is brought into contact with the mold register surface of the second fixed mold 23 and the second movable mold 27, a molten synthetic resin is respectively injected into the molding space of the first fixed and movable molds 21, 25 and the molding space of the second fixed and movable molds 23, 27 by the first and second injection devices 11, 37 to simultaneously mold first and second molded products.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple injection molding apparatus capable of simultaneously molding a plurality of molded products.

[0002]

2. Description of the Related Art A conventional injection molding apparatus is fixed to a main body frame, a fixed side mounting board on which a fixed mold is mounted, and a movable mold supported on a fixed side mounting board so as to be movable relative to the fixed side mounting board. Side mounting board, fixed side mounting board side body frame, injection device mounted so that the axis of the injection screw almost coincides with the machine center, movable side mounting board reciprocating toward the fixed side mounting board What is constituted by a fastening member is generally known.

[0003]

However, the conventional injection molding apparatus described above can mold only one type of molded product in one molding operation. For this reason, in order to mold a plurality of types of molded products, it is necessary to mold using a number of injection molding devices according to the types of molded products, which causes a problem that the molding device becomes expensive and the molding cost becomes high. Have
Also, it is possible to mold multiple types of molded products by exchanging the mold every time the molding work of a predetermined lot is completed, but since the mold itself is extremely heavy, the replacement work Takes time and the molding work efficiency is poor.

The above-mentioned drawback is that a plurality of types of molds are mounted on the fixed side and movable side mounting boards, respectively, and a number of injection devices corresponding to the fixed side molds are mounted on the main body frame to perform one molding operation. This can be solved by making it possible to simultaneously mold multiple types of molded products and by making the injection molding machine itself a dedicated multi-injection molding machine, but there is the problem that the molding machine itself becomes extremely expensive and the molding cost becomes high. ing.
In particular, when one type of molded product is molded using such a multiple injection molding apparatus, the molding cost is extremely high relative to the molding machine cost.

The present invention was invented in order to solve the above-mentioned conventional drawbacks, and an object thereof is to enable simultaneous molding of a plurality of types of molded products easily by using a general-purpose molding device. To provide a multi-injection molding apparatus.

Another object of the present invention is to provide a multiple injection molding apparatus capable of reducing the molding cost by avoiding the molding apparatus itself from being a dedicated machine.

[0007]

Therefore, according to the present invention, a fixed side mounting board and a supporting board, which are arranged so as to face each other at a predetermined interval with respect to the main body frame and on which the tie bar is installed horizontally, and the tie bar are provided. The movable side mounting board, which is slidably supported in the axial direction, the mold clamping member that reciprocates the movable side mounting board in the axial direction, and the tie bar between the fixed side mounting board and the movable side mounting board. And an intermediate mounting board that is supported parallel to the fixed side and movable side mounting boards and is slidable in the axial direction, and mounted on one surface of the fixed side mounting board and the intermediate mounting board facing the fixed side mounting board. At least a first fixed mold and a first movable mold; a second fixed mold and a second movable mold which are respectively mounted on the other side of the intermediate mounting plate facing the movable side mounting plate and the movable side mounting plate; Two
A fixed member, which is slidable in the axial direction with respect to the fixed mold and the second movable mold, is supported in a state where the mold is prevented, and connects the molds with each other at a predetermined interval, and fixed. A first injection device, which is arranged on the main body frame on the side mounting board side so that the axis of the injection screw substantially coincides with the machine center, and injects synthetic resin, and the second fixed mold and the second movable mold that are clamped. The axis of the injection screw is arranged on the side of the main body frame according to the mold matching surface with the mold substantially orthogonal to the machine center, and the synthetic resin is injected into these molds.
And an injection device.

[0008]

Since the present invention is constructed as described above,
For single-color molding, remove the intermediate mounting board from the tie bar, mount the fixed mold on the fixed side mounting board and the movable mold on the movable side mounting board, and then fix the movable mold by the mold clamping member. Molding is performed by clamping the molds and injecting synthetic resin into the molding spaces of these molds by the first injection device.

On the other hand, when molding a plurality of types of molded products at the same time, after mounting the intermediate mounting board to the tie bar, the first fixed mold and the first movable mold are mounted on one surface of the fixed side mounting board and the intermediate mounting board. The second fixed mold and the second movable mold are mounted on the other surface of the intermediate mounting plate and the movable side mounting plate, and the second fixed mold and the second movable mold are connected by a connecting member. Then, the movable side mounting plate is moved by the mold clamping member, first the second fixed mold and the second movable mold are clamped, and then the intermediate mounting plate is moved with this mold clamping to move the first fixed mold. And, the first movable mold is clamped. Next, a synthetic resin is injected into the molding spaces of the clamped first fixed mold and the first movable mold by the first injection device, and the second fixed mold and the second movable mold that are clamped. The first and second synthetic resins are respectively injected from the mold matching surface by the second injection device.
Mold each molded product.

After the molding operation is completed, the mold clamping member is moved back to move the movable side mounting plate to the original position. First, after the second movable mold is separated from the second fixed mold, these are moved. The intermediate mounting board is moved by the connecting member connecting the molds to separate the first movable mold from the first fixed mold.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, a multiple injection molding apparatus 1 is shown.
A fixed side mounting board 5 and a supporting board 7 are arranged on the main body frame 3 of the vehicle so as to be opposed to each other with a predetermined space therebetween, and four tie bars 9 are provided at respective corners of the fixed side mounting board 5 and the supporting board 7. Is crossed over. Further, the first injection device 11 is arranged on the main body frame 3 on the fixed side mounting board 5 side such that the axis of the injection screw (no reference numeral) and the machine center of the main body frame 3 substantially coincide with each other. The first injection device 1
Reference numeral 1 denotes an injection screw rotatably supported in a heating cylinder 11b mounted on a movable base 11a movably supported toward a fixed side mounting board 5, and a synthetic resin melted with the rotation of the injection screw. It has a conventionally known structure in which a nozzle is injected from an injection nozzle at the tip.

A movable side mounting board 13 is supported on each tie bar 9 so as to be slidable in the axial direction in parallel with the fixed side mounting board 5 and the supporting board 7, and the movable side mounting board 13 is mounted on the supporting board 7. The rod of the mold clamping cylinder 15 as the mold clamping member is fixed. And mold clamping cylinder 15
The movable side mounting board 13 is moved to the fixed side mounting board 5 in accordance with the operation of
Is moved toward and away from.

An intermediate mounting board 17 can be attached to and detached from a tie bar 9 located between the fixed side mounting board 5 and the movable side mounting board 13, and is mounted in parallel to the fixed side mounting board 5 and the movable side mounting board 13. . The intermediate mounting board 17 is made of a substantially square-shaped metal block, and shaft supporting portions 19a, 19b, 19c, 19d are integrally formed on the upper and lower side portions. Each of the shaft supporting portions 19a, 19b, 19c, 19d has a semicircular shape whose inner surface substantially coincides with the outer peripheral surface of each tie bar 9, and is slidably supported on the tie bar 9. still,
Notches 17a are formed on both sides of the upper part of the intermediate mounting board 17, and the attachment to the tie bar 9 is enabled by the notches 17a.

Fixed side mounting board 5 and movable side mounting board 13
The first and second fixed molds 21 and 23 are provided on one surface of the intermediate mounting board 17 which faces the fixed mounting die 5, and the other surface of the intermediate mounting board 17 which faces the fixed side mounting board 5 and the first mounting die 13 are provided on the movable side mounting board 13.
And the second movable molds 25 and 27 are attached respectively.
The first fixed mold 21 and the first movable mold 25 have cores and cavities according to the first molded product (no reference numeral), and the second fixed mold 23 and the second movable mold 27 have second cores and cavities. It has a core and cavities according to the molded product (no reference number).

The first movable mold 25 and the second movable mold 2
Each of the protrusions 7 has a protrusion board having a protrusion pin capable of protruding into the cavity movably in the axial direction, and each of the protrusion boards has a cylinder (both mounted on the intermediate mounting board 17 and the movable side mounting board 13). Rods (not shown) are connected.

Bearings 29a, 29b, 31a, 31b are attached to both side surfaces of the first fixed mold 21, the first movable mold 25, the second fixed mold 23, and the second movable mold 27, respectively. 29a and bearing 29b and bearing 31a and bearing 31
Rods 33 and 35 as connecting members are slidable on b, and both ends thereof are attached so as to be prevented from coming off. The axial length of each of the rods 33 and 35 has a first fixed mold 21, a first movable mold 25, a second fixed mold 23, and a second movable mold 2.
The intervals are set so that the first and second molded products can be taken out when the molds 7 are opened.

A second injection device 37 is provided on the side of the main body frame 3 corresponding to the mating surface (parting surface) of the clamped second fixed mold 23 and second movable mold 27. The axis of the screw (no reference numeral) and the axis of the tie bar 9 are arranged so as to be orthogonal to each other. The second injection device 37, like the first injection device 11, rotatably supports an injection screw in a heating cylinder 37b mounted on a movable table 37a movably supported on a frame 39 thereof,
The structure is such that the synthetic resin melted with the rotation of the injection screw is injected from the injection nozzle at the tip.

Next, the operation of the multiple injection molding apparatus 1 configured as described above will be described.

First, when the multiple injection molding apparatus 1 is used as an ordinary single-color molding machine for molding one type of molded product, the intermediate mounting board 17 is removed from the tie bar 9. Then, the fixed mold according to the molded product is attached to the fixed side mounting board 5
After mounting the movable mold on the movable side mounting plate 13, the mold clamping cylinder 15 was operated to clamp the pair of molds, and then the first injection device 11 was operated to perform the mold clamping. A molding process is performed by injecting a synthetic resin into the molding space of a pair of molds.

On the other hand, the case of simultaneously molding two kinds of molded products by the multiple injection molding apparatus 1 will be described. First, each shaft support portion 19a of the intermediate mounting board 17 is mounted on each tie bar 9.
After supporting 19b, 19c, and 19d, the first fixed mold 21 and the first movable mold 25 corresponding to the first molded product are attached to the other surface of the fixed-side mounting board 5 and the intermediate mounting board 17, and the intermediate mounting is performed. After mounting the second fixed mold 23 and the second movable mold 27 according to the second molded product on one surface of the plate 17 and the movable side mounting plate 13, the mold clamping cylinder 15 is operated to move the movable side mounting plate 13. Is moved to the fixed side attachment board 5 side.

At this time, after the second fixed mold 23 and the second movable mold 27 are clamped together with the movement of the movable side mounting plate 13 (see FIG. 4), the movable side mounting plate 13 further moves. The intermediate mounting board 17 is moved by 13 to move the first fixed mold 2
1 and the first fixed mold 23 are clamped (see FIG. 5).
Further, the rod 33 that connects the first fixed mold 21 and the first movable mold 25 and the second fixed mold 23 and the second movable mold 27 includes the first fixed mold 21 and the first movable mold 25. Since the second fixed mold 23 and the second movable mold 27 are slidably supported, the first fixed mold 21, the first movable mold 25, the second fixed mold 23, and the second fixed mold 23 The movable die 27 can be clamped.

The injection nozzle of the first injection device 11 is used for the sprue of the first fixed mold 21, and the injection nozzle of the second injection device 37 is used for the second fixed mold 23 and the second movable mold 27. After abutting against the surface, the first injection device 11 causes the first fixed mold 21 and the first movable mold 25 to be in the molding space, and the second injection device 37 causes the second fixed mold 23 and the second movable mold 25 to move. Mold 27
The first and second molded products are simultaneously molded by injecting the molten synthetic resin into the molding space.

When the mold clamping cylinder 15 is returned after a predetermined curing time has elapsed, the second fixed mold 23 and the second movable mold 23 are first moved along with the return of the movable side mounting plate 13 as shown in FIG. The mold 27 and the mold are opened. At this time, since the second fixed mold 23 and the second movable mold 27 are connected by the rod 35 that is prevented from coming off, as shown in FIG.
When the fixed mold 23 and the second movable mold 27 are opened at a predetermined interval, the intermediate mounting board 17 moves to the movable side mounting board 13 side as the movable side mounting board 13 returns. 1. The fixed mold 21 and the first movable mold 25 are opened.

Next, the first fixed mold 21 and the first movable mold 2
5, the second fixed mold 23 and the second movable mold 27 are opened respectively, and then the intermediate mounting board 17 and the movable side mounting board 13
The first and second molded products held by the first movable mold 25 and the second movable mold 27 are operated by, for example, a molded product automatic take-out machine by operating the cylinders attached to the The molding work is completed by projecting to a position where chucking is possible.

As described above, according to the present embodiment, by mounting the intermediate mounting board 17 on a general-purpose injection molding device, two kinds of molded products can be simultaneously molded by one molding operation, and the injection molding device can be manufactured at a low cost. Molding efficiency can be increased and cost can be reduced while maintaining cost reduction.

In the above description, the rod 33 is attached to the first fixed mold 21 and the first movable mold 25 in addition to the second fixed mold 23 and the second movable mold 27. The rod 33 is not always necessary.

Further, in the above description, one intermediate mounting board 17 is mounted between the fixed side mounting board 5 and the movable side mounting board 13 so that two kinds of molded products can be molded at the same time. Tie bar 9 corresponding to the board 5 and the movable side mounting board 13
Alternatively, two or more intermediate mounting boards 17 may be attached to enable simultaneous molding of three or more types of molded products.

[0029]

Therefore, according to the present invention, a general-purpose molding machine can be used to easily mold a plurality of types of molded products simultaneously.

Further, it is possible to reduce the molding cost by avoiding the molding machine itself from being a dedicated machine.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a multiple injection molding apparatus.

FIG. 2 is a perspective view showing a mounting state of an intermediate mounting board.

FIG. 3 is a plan view of a multiple injection molding device.

FIG. 4 is a plan view showing a state during mold clamping.

FIG. 5 is a plan view showing a mold clamped state.

FIG. 6 is a plan view showing a state during mold opening.

[Explanation of symbols]

 1 Multiple Injection Molding Device 3 Main Frame 5 Fixed Side Mounting Board 7 Support Board 9 Tie Bar 11 First Injection Device 13 Movable Side Mounting Board 15 Clamping Cylinder as Mold Clamping Member 17 Intermediate Mounting Board 21 First Fixed Mold 23 Second Fixed mold 25 First movable mold 27 Second movable mold 33 Rod as connecting member 37 Second injection device

Claims (1)

[Claims] 1. A fixed-side mounting board and a support board, which are arranged so as to face the main body frame with a predetermined space therebetween and on which a tie bar is horizontally mounted, and are supported slidably in the axial direction with respect to the tie bar. The movable side mounting board, the mold clamping member that reciprocates the movable side mounting board in the axial direction, and the tie bar between the fixed side mounting board and the movable side mounting board can be attached to and detached from the fixed side and movable side mounting board. An intermediate mounting board that is parallel and is slidably supported in the axial direction, a fixed side mounting board, and a first fixed mold and a first movable mold that are respectively mounted on one surface of the intermediate mounting board facing the fixed side mounting board. A second fixed mold and a second movable mold which are respectively mounted on the other surface of the intermediate mounting plate facing the movable side mounting plate and the movable side mounting plate, and at least the second fixed mold and the second movable mold. It can slide in the axial direction, The axis of the injection screw is almost coincident with the machine center in the connecting member that is supported in a state where it is held in place and that connects these dies in a state where they are separated from each other at a predetermined interval, and the main body frame on the fixed side mounting board side. Axis of the injection screw on the side of the main body frame corresponding to the mating surfaces of the first injection device for injecting the synthetic resin and the clamped second fixed mold and the second movable mold. And a second injection device for injecting synthetic resin into these molds.