JPH04133711A - Ejection system - Google Patents

Abstract

PURPOSE:To make ejection of a molded product appropriate at every mold, by a method wherein ejectors are provided by enabling them to correspond to respective ones of a plurality of molds and ejection timing, ejection force and ejection speeds of the ejectors each are made adjustable at every mold. CONSTITUTION:When signals of limit switches L1, L2 are different from each other, a CPU of an NC device 11 makes a shunting signal and operates a driver device 12 and a needle 13 of a linear motor in an ejector 10 is made a shunt position. A shunting movement of the needle 13 is suspended by turning a limit switch ON. Then processes of mold clamping, injection, dwelling and cooling mold breaking are performed in order and then becomes an ejection process under control of the NC device 11. Then an ejection signal is made by the CPU of the NC device and operates a driver device 12 through an output circuit D/0. With this construction, the needle 13 of the linear motor performs ejection of a molded product under an established order and moreover, at ejection force and an ejection speed established respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an eject method in multi-mold molding.

Prior Art In multi-mold molding, in which multiple molds are simultaneously clamped and molding materials such as resin are sometimes injected, ejection operations are performed uniformly, and molded products are ejected from each mold at the same time under the same conditions.

However, in the eject operation, it is generally appropriate for thick-walled products to be ejected slowly with a relatively large force, and for thin-walled small products to be ejected quickly with a light force. Therefore, even in multi-mold molding, if the molded products from multiple molds are not the same, it is impossible to sustainably obtain a good product unless the ejection force and speed are set appropriately for each mold. .

Further, in such a case, the molded products are ejected in a state where they are each finely divided, but if different types of molded products are ejected all at once, it takes time and effort to sort them in a subsequent process.

Problems to be Solved by the Invention It is an object of the present invention to provide an eject method that can eject molded products from each mold individually according to their characteristics in multi-mold molding.

Means for Solving the Problems Eject devices are provided in correspondence with each of a plurality of molds.

The ejection timing, ejection force and ejection speed of each eject device can be adjusted for each mold.

A working ejector device ejects a molded article from each mold.

The means by which the ejection timing, ejection force and ejection speed of each eject device can be adjusted for each mold is as follows:
To make the protrusion of a molded product appropriate for each mold.

Embodiment FIG. 1 shows a mold clamping section 1 in an injection molding machine, which is composed of a fixed platen 2, a movable platen 3, and four tie bars 4 on the front, rear, left, and right sides. The fixed platen 2 is connected to a rear platen (not shown) by the tie bar 4 described above, and the movable platen 3 is attached to the tie bar 4 so as to be slidable in the front and rear directions.

The opposing surfaces of the fixed platen 2 and the movable platen 3, that is,
Each mold mounting surface is multi-molded F5 (a,
b) is installed. The multi-mold 5a is composed of four fixed side molds 7a fixed to a holding plate 6a, and four movable side molds (A, B, C, D) are attached to the holding plate 6b of the multi-mold 5bINiilf/11. Type 7b
(Fig. 2).

Each of the movable side molds 7b has a molding cavity 8 on its bartending surface, and an eject hole 9 communicating with the molding cavity 8 is provided to penetrate from the front and back. Note that the depth, size, and shape of the molding cavity 8 may be the same or different for each mold 7b.

In this mold 7, the runner is connected to the molding cavity 8 through a tunnel gate, and when the mold is opened, the molded products are individually separated from the runner before being ejected.

On the movable platen 3 to which the multi-mold 5b is attached, an eject device 10 is arranged in the front-rear direction in accordance with the back position of each movable mold 7b, and an eject device 10 is connected to an NC device 11 provided in each injection molding machine via a driver device 12. connected.

In this embodiment, the ejecting devices 10 have the same configuration;
It is composed of limit switches LL and L2 that detect the protruding position and retracted position of No. 3. Note that the multi-mold 5b is formed with through holes 15 extending in the front-rear direction and communicating with the eject holes 9 of each of the fixed molds 7b.

The limit switch L1 is turned on only when the movable element 13 is in the protruding position, and the limit switch L2 is turned on only when it is in the retracted position.

In addition, the mover 13 is used as it is as an eject pin for ejecting the product, and the limit switch L mentioned above is used as it is.
The on/off signals of L and L2 are input to the input circuit D of the NC device 11.
/I (Figure 3).

Note that the thrust and speed of the movable element 13 are determined by the voltage and current amount of the supplied electric power.

The driver device 12 is a kind of manual setting device that adjusts the power to the linear motor of each eject device 10 to a preset voltage and current with 1=1.
It is connected to the output circuit D10 of the C device 11, and the NC device 11
The electric power set by the ejection/retraction signal from the ejector 10 is supplied to each ejector 10. This driver device W112 has a simple judgment function, and reverses the direction of the current supplied to each eject device rI110 in the case of an ejection signal and in the case of an ejection signal, and turns on the limit switch L2 in the case of an ejection signal. is ignored, and in the case of the evacuation signal, the ON operation of limit switch L1 is ignored.

The NC device 11 has a well-known configuration, and has a central processing unit (CPU) that stores a control program for injection molding operations, including a RAM 1 that stores temporary data for calculation processes.
nonvolatile memory 16 for storing OM, NC data, etc.;
Manual input device IMDI.

Input circuit D/I that takes in signals from external equipment, CPU
The CPU includes an output circuit D10 for transmitting commands from the CPU to external equipment, and a servo interface 17 for operating the external equipment based on servo commands from the CPU.

In FIG. 1, reference numeral 18 denotes a product take-out conveyor, which is located directly below the mold clamping section 1 and runs in the direction of the arrow at a predetermined speed while the molding machine is in operation.

For multi-mold molding, make the following preparations in particular.

The four selected molds (A, B, C, D) 7 (a
.

Divide b) into a fixed side and a movable side and attach the holding plate 6 (a, b
) and make it a multi-mold 5 (a, b).

This is fixed to the mold mounting surfaces of the fixed platen 2 and movable platen 3 of the mold clamping part 1 with clamps, respectively.

At this time, the movable element 13 (eject pin) of the linear motor in the eject device 9 is in the retracted position. Also,
The multi-mold 5b on the movable platen 3 side
To attach the mold A, move the movable element 13 of each ejector 9 protruding from the surface through the through hole 15 of the holding plate 6.
Fit them into the eject holes 9 of B, C, and D, respectively, and then clamp them.

By manually operating the driver device 12, the voltage and current of the power supplied to each eject device 10 are set to values appropriate for ejecting the molded product of each mold, and the order of ejecting the products (the order of operation of the eject device 10) is set. ).

The molding operation takes place as follows, particularly with regard to the ejecting operation.

At the start of the molding operation, the CPU of the NC device 11 checks whether the limit switch L2 of the eject device 9 is on and the limit switch L1 of the eject device 9 is off, along with other check items, by checking the limit switches LL and LL stored through the D/I. Examine the L2 signal. If the difference is found, the CPU of the NC device 11 issues an evacuation signal, operates the driver device 12 via the output circuit D10, sets the movable element 13 of the linear motor in the ejector device 10 to the evacuation position, and satisfies the above conditions. . The retreat movement of the movable element 13 is stopped when the limit switch L2 is turned on.

Then, under the control of the NC device 11, mold clamping, injection, pressure holding,
The cooling mold opening process is performed sequentially, followed by the ejecting process. Then, the CPU of the NC device 11 issues an ejection signal and operates the driver device 12 through the output circuit D10. As a result, the movers 13 of the linear motors in each ejector 10 are moved in the set order, and
The product is ejected using the ejection force and ejection speed set for each.

When the movable element 13 reaches the product ejection completion position, the limit switch L1 is turned on and the movable element 13 stops.

When the signal from the limit switch L1 is confirmed by the CPU via the input circuit D/1, the CPU issues a save signal to the driver 12. Then, the movable element 13 of the linear motor moves backward until the limit switch L2 is turned on, and stops when the switch is turned on.

This position is the retracted position. When the CPU confirms that the limit switch L2 is on through the input circuit D/I, it ends the eject operation.

The operation of returning the mover 13 may be performed simultaneously in each ejector device 10.

As a result of the eject operation, the ejected products fall onto the product take-out conveyor in the order in which they were ejected, and are transported to the next process.

As mentioned above, in multi-mold molding, each mold 5
(a, b) Product ejection is performed that is most suitable for each product characteristic. Further, the products that have been pushed down are placed on the take-out conveyor one after another.

In addition, as another example, a program or an NC device may be used to set the voltage, current, and ejection order settings for the linear motor of each ejector 10 in the NC device 11.
The settings may be made through a manual input device MDI (shown by a broken line in FIG. 3).

In this case, the data previously input from MDI is
The table is stored in a table set in the non-volatile memory 16 at a location corresponding to each eject device 10, or is read out from the program and stored, and in the ejection process, the CPU first selects the table for each eject device 10 from the table. The data is read out, necessary pulse processing is performed, and the value is transmitted to the section corresponding to each eject device 10 of the driver device 12 via the servo interface 17, and the voltages and the like mentioned above are sequentially set. The subsequent operations are similar to those described above. However, it is not necessary to set various values for the driver device 12 until the next mold exchange.

The above is an example.

Linear motors are not limited to direct current types.

The ejecting device 10 may be a small motor and a ball screw mechanism or a fluid actuator capable of adjusting flow rate and pressure. Moreover, a small servo motor can also be used.

The ejecting device 10 can also be mounted on a fixed platen.

Effects of the Invention In the eject operation of multi-mold molding, there is less damage to the product when ejecting the product.

Since the products sent out from the molding machine are lined up in the order in which they were knocked down, it is easy to sort them in the subsequent process.

In addition, mold management in multi-mold molding becomes easier, such as determining the order of products and determining which mold was used to produce defective products.

[Brief explanation of drawings]

FIG. 1 is a schematic front view partially shown in cross section, FIG. 2 is a perspective view, and FIG. 3 is a block diagram of the control mechanism. DESCRIPTION OF SYMBOLS 1... Mold clamping part, 5 (a, b)... Multi-mold, 7 (a, b)... Mold, 9... Eject device, 10... Driver device, 12... Mover, 1
3...Stator.

Claims (1)

[Claims] In multi-mold molding, in which multiple molds are simultaneously clamped and molded, eject devices are provided in correspondence with each of the multiple molds, and the ejection timing, ejection force, and ejection speed of each eject device are adjusted for each mold. The eject method is characterized by being adjustable.