JPS6359365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding machine for thermosetting resin, and in particular, a plurality of mold devices mounted on a rail formed in a closed circuit, and a a plurality of work stations provided; a working medium supply device provided at the work station for locking the mold device in a working position and supplying a working medium thereto; and a transfer cylinder for transporting the mold device. This relates to an injection molding machine consisting of.

In general, injection molding machines for thermosetting resins tend to take a long time to harden the resin, resulting in a lingering time after the injection process, resulting in a reduction in work efficiency. For this reason, the mold is moved from the injection process work location to another location while the mold is still in the mold clamped state, and the resin is cured during this time to eliminate the above-mentioned waiting time. Generally, a plurality of molds are arranged in the mold, and each mold is equipped with a mold clamping cylinder, so that the mold can be rotated and exited from the injection process position while the mold is in the clamped state. It is true.

By the way, in the conventional technology using such a rotary table, the number of molds is limited due to the structure of the rotary table, and the time required for resin curing is also restricted. The disadvantage is that the table becomes larger and the overall structure becomes more complicated, resulting in higher costs.

In addition, because the range of movement of the mold is restricted, workers are grouped together in one place, which worsens work efficiency. Another disadvantage was that the installation space was limited.

The purpose of this invention is to make it possible to move a mold equipped with a mold clamping device on a rail formed in a closed circuit, in view of the problems caused by the structural limitations of the injection molding machine for thermosetting resin based on the above-mentioned conventional technology. The object is to provide an excellent injection molding machine for thermosetting resin that not only eliminates the above-mentioned drawbacks and eliminates the disadvantages but also eliminates the disadvantages and has extremely good workability by adopting a structure in which the machine is mounted on a rack. It is.

The configuration of the present invention in accordance with the above object is such that during injection molding work, a mold device mounted on a rail forming a closed circuit is sequentially moved to exit from an injection position,
The purpose of this invention is to shorten the waiting time until the resin hardens, and to improve workability by transporting the mold device to a location suitable for other work.

Next, embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 5, reference numeral 1 indicates a rail forming a closed circuit, and is supported by a support 2. In FIG.
Reference numeral 3 denotes a mold device, which consists of an upper mold 4, a lower mold 5, and a mold clamping cylinder 6. The upper mold 4 is attached to the lower surface of the upper mold plate 7, and the lower mold 5 and the mold clamping cylinder 6 are attached to the upper and lower surfaces of the lower mold plate 8, respectively. 9
is connected to the mold clamping cylinder 6 by a cross plate and to the upper mold plate 7 via tie bars 10, and moves the upper mold plate 7 up and down by the operation of the mold clamping cylinder 6. A wheel 11 is attached to the lower part of the lower template 8, and the wheel 11 is attached to the rail 1.
The mold device 3 is mounted on the rail 1. Reference numeral 12 denotes a working medium supply pipe, one end of which is connected to the mold clamping cylinder 6, and the other end connected to a communication port 13 formed in the lower mold plate 8. Note that 14 is an opening for an index stopper.

Reference numeral 15 denotes a working medium supply device, which includes a guide table 16, a connecting cylinder 17, and a pressure source 18. The guide table 16 is supported by a support 19 and is located at a position where it substantially contacts the lower surface of the lower mold plate 8 of the mold device 3. 20 is connected to the connecting cylinder 17 by an index stopper, and a carriage 21 is fixed at an intermediate position thereof, and the carriage 21 is connected to the guide table 1.
It is supported by a guide rod 22 suspended from the lower surface of 6 so as to be movable up and down. 23 is a port connector disposed resiliently on the carriage 21, and is connected to the pressure source 18.
is connected to. In addition, 24 is an index stopper guide hole, and 25 is a port connector guide hole, into which the port connector 23 is fitted, and the pressure source 18 can be communicated with the cylinder 6 via the working medium supply pipe 12. It is.

In FIG. 5, 26 is a heating cylinder, and 27 is a nozzle at the tip, which descends during the injection process and is brought into contact with the upper mold 4 of the mold device 3.

In addition, A and B in the figure indicate work stations, and A
B is a mold opening/closing station, and B is a mold clamping (injection) station. The working medium supply device 15 is fixedly installed at each of the work stations A and B, respectively.

FIG. 6 is a plan view showing the whole, and the rail 1 forming the open circuit consists of a pair of horizontal rails 1a, 1a' and a pair of longitudinal rails 1b, 1b'.

3a, 3b, 3c...3x, 3y, 3z are the first
The mold apparatus 3 is shown in FIGS. 5 to 5, and the number thereof is arbitrary.

Pallets 28 and 28' are mounted on longitudinal rails 1b and 1b', respectively, by wheels (not shown), and on their upper surfaces are auxiliary rails 29, which are flush with the transverse rails 1a and 1a'. 29' is provided. Reference numerals 30 and 30' designate mold device transfer cylinders, which are provided facing in the same direction as the lateral rails 1a and 1a', respectively.

In the above configuration, the mold device 3 shown in FIG. and through the openings 14 in the lower mold plate 8 of the mold device 3, whereby the mold device 3 is locked in the working position of the mold opening/closing station A.

At the same time, the port connector 23 is also guided to the guide hole 25, fitted therein, and elastically connected to the communication port 13 of the lower mold plate 8, and finally connected to the working medium supply pipe 12 via this. be done.

Then, the working medium is supplied from the pressure source 18 to the mold clamping cylinder 6 through the working medium supply pipe 12, and the cross plate 9 is pulled up, the upper mold plate 7 is raised, and the upper mold 4 is opened. As shown in the figure.

In this mold open state, various necessary operations are performed, such as a molded product removal operation, a cull removal operation, an insert insertion operation, and the like.

After each of the above operations is completed, the direction of action of the working medium in the mold clamping cylinder 6 is changed in response to a command signal from an appropriate control device (not shown), and the upper mold plate 7 and The upper mold 4 is lowered to close the mold.

Next, as shown in FIG. 3, the connecting cylinder 17 in the working medium supply device 15 is operated,
The index stopper 20 is lowered and pulled out from the index stopper opening 14 of the lower mold plate 8 of the mold device 3, and the mold device 3 is unlocked.

Incidentally, at this time, the port connector 23 is also pulled down at the same time, and the connection with the communication port 13 is released.

In this state, the mold device 3 is pushed to the left by the driving source via the subsequent mold device 3' as shown in FIG. ) Move to station B.

When the mold device 3 reaches the mold clamping (injection) station B, a command signal is given to the connecting cylinder 17 of the working medium supply device 15, as shown in FIG. 5, the index stopper 20 rises, and the lower mold The mold assembly 3 is locked in the working position of the station B by engaging the opening 14 in the plate 8.

At this time, the port connector 23 is also connected to the communication port 13, and the pressure source 18 and the mold clamping cylinder 6 are communicated with each other.

Thus, the mold clamping cylinder 6 is operated by the working medium from the pressure source 18, and both molds 4 and 5 are clamped. Then, the injection process begins, the heating cylinder 26 is lowered, the tip nozzle 27 is brought into contact with the upper mold 4, and injection into the mold is performed.

During this time, the subsequent mold apparatus 3' is at the mold opening/closing station A, and the above-mentioned operations are performed.

After the injection process is completed, the heating cylinder 26 moves upward to disengage from the mold device, and the index stopper 20 is pulled out downward to unlock the mold device 3 and remove the mold. Mold device 3 moves to mold clamping (injection) station B while maintaining the mold clamping state.
The non-working stations are separated from the mold opening/closing station A and the mold clamping (injection) station B.
be transported to another area.

The mold then goes around the closed circuit of the rail 1, during which time the resin in the mold hardens, and then returns to the mold opening/closing station shown in FIG. 1, where the same operations as described above are performed.

Next, the operation of the mold clamping cylinder during the opening/closing and holding operations of the mold of the mold apparatus 3 described above will be explained in more detail as follows.

FIG. 7 is a block diagram showing the internal structure of the mold clamping cylinder 6, in which the working medium supply pipe 12 is connected to the electromagnetic switching valve 6b through the check valve 6a, and the valve 6
From b, working medium supply branch pipes 6c and 6d are connected to the upper chamber 6f of the pneumatic/hydraulic conversion cylinder 6e, respectively.
and the lower chamber 6g, and a discharge pipe 6h extends from the valve 6b.

An upper piston 6i is vertically movably inserted into the upper chamber 6f of the pneumatic/hydraulic conversion cylinder 6e.
A lower piston 6j is also inserted into the lower chamber 6g so as to be vertically movable, and an upper piston 6j is also inserted into the lower chamber 6g.
Hydraulic piston 6k protruding downward from i
is inserted into a small-diameter intermediate chamber 6l provided so as to communicate the upper chamber 6f and the lower chamber 6g. The space between the lower piston 6j and the hydraulic piston 6k is filled with hydraulic oil.

6m is a drive rod, which connects the lower piston 6j and the cross plate 9.

Now, when the electromagnetic switching valve 6b is de-energized to the connected state shown in the figure and air is forcefully fed through the working medium supply pipe 12, the air is guided to the upper chamber 6f through the working medium supply branch pipe 6c, and the air is hydraulically connected together with the upper piston 6i. Since the piston 6k is lowered, the intermediate chamber 6
High pressure acts on the hydraulic oil filled in the tank 1, causing the lower piston 6j to descend under high pressure. This lowering movement lowers the cross plate 9 under high pressure via the drive rod 6m, thereby enabling mold clamping.

At this time, the air in the lower chamber 6g reaches the electromagnetic switching valve 6b through the working medium supply branch pipe 6d, and is discharged into the atmosphere from the discharge pipe 6h.

Then, when the mold clamping work is completed, the port
When the connector 23 is disconnected from the communication port 13 to stop the air pressure feeding, the air in the upper chamber 6f is confined within the upper chamber 6f by the blocking action of the check valve 6a.

As the air in the upper chamber 6f is compressed and reduced, even after the air pressure is stopped, the air in the intermediate chamber 6l remains
This makes it possible to maintain the hydraulic pressure within the mold at a high pressure value approximately equal to the mold clamping pressure, thereby continuously maintaining the mold clamping state.

On the other hand, when the electromagnetic switching valve 6b is energized to switch the connection relationship between the working medium supply pipe 12 and the working medium supply branch pipes 6c and 6d to forcefully feed air, the air is guided to the lower chamber 6g, and the lower piston 6j, The upper piston 6i is raised together. At this time, the upper chamber 6f
The air is exhausted from the exhaust pipe 6h.

In the above embodiment, the pneumatic/hydraulic conversion cylinder 6e is used, but it is optional to use a hydraulic cylinder instead.

In that case, an accumulator is connected to a part of the working medium supply branch pipe 6c, and the discharge pipe 6h is
may also be extended to the hydraulic oil source via another communication port and port connector, and the hydraulic oil may be conveyed through the working medium supply pipe 12, the branch pipes 6c and 6d, and the discharge pipe 6h.

Next, the transfer operation of the mold device 3 will be explained as follows.

The mold opening/closing and holding operations described with reference to FIGS. 1 to 5 are performed on a closed circuit rail 1 as shown in FIG. 6.

In FIG. 6A, predetermined operations are performed on the mold device 3a in the mold opening/closing station A and the mold device 3b in the mold clamping (injection) station B. During this time, the longitudinal rails 1b, 1b' The upper pallets 28, 28' are connected to the lower transverse rail 1a.
A mold device 3y is placed on the pallet 28 on the right side.

After the above prescribed work is completed, both mold devices 3a, 3
After the lock b is released, as shown in FIG. 6B, the lower transfer cylinder 30 operates, contacts the mold device 3Y, pushes it to the left, and removes it from the auxiliary rail 29 of the pallet 28. Transfer to the lateral rail 1a.

At this time, each mold device on the horizontal rail 1a moves to the left, and the mold device 3b that has completed the injection process
remains in the mold clamping state at mold clamping (injection) station B
The mold device 3a, which has exited from the mold and has been closed, enters the mold clamping (injection) station B, and the subsequent mold device 3z enters the mold opening/closing station A.

The leftmost mold device 3c has a horizontal rail 1.
a to the auxiliary rail 29' of the left pallet 28'.

Next, as shown in FIG. 6C, both pallets 28, 28' are moved on the longitudinal rails 1b, 1b' by an appropriate drive source (not shown), and aligned with the upper horizontal rail 1a'. At this time, it is convenient to synchronize the movements of both pallets 28, 28'.

Then, as shown in FIG. 6D, the upper transfer cylinder 30' is actuated to push the mold assembly 3c on the pallet 28' onto the transverse rail 1a'. During this time, each mold device on the lateral rail 1a' is sequentially transferred to the right, and the rightmost mold device 3x is moved onto the pallet 28.

In this state, when both pallets 28, 28' are moved downward and aligned with the lower transverse rail 1a, the state shown in FIG. 6A is restored.

It goes without saying that during the operations shown in FIGS. 6C and 6D, predetermined operations are performed at each of the work stations A and B.

In this way, the mold device that has completed the injection process is sequentially transferred on the rail 1 with the mold clamped, and the above operation is repeated several times until the resin in the mold reaches the mold opening/closing station. It has been completely cured.

It is needless to say that the embodiments of the present invention are not limited to the above-mentioned embodiments. For example, it is not necessary to arrange the above-mentioned work stations A and B adjacently, and the position of the mold apparatus 3z shown in FIG. 6A may be changed. may be used as a mold opening/closing station, or may be placed in the upper horizontal rail 1a' in consideration of the surrounding work environment.If the position of each station is determined in consideration of workability, good.

Furthermore, the mold opening operation and the mold closing operation can be separated, for example, the position of the mold device 3a in FIG. 6A can be used as the mold closing station, and the position of the mold device 3z can be used as the mold opening station.

In addition, the number of mold devices is limited to mold clamping (・
It is determined in relation to the transport time from the injection station to the mold opening/closing station and the curing time of the resin.

As described above, according to the present invention, a plurality of work stations are arranged in a rail forming a closed circuit,
By mounting a plurality of mold devices consisting of upper and lower molds and mold clamping cylinders on the rail, the number of mold devices can be selected arbitrarily, which eliminates the need for long heat curing. It has the excellent effect of being able to accurately correspond to the curing time of the plastic resin, eliminating the waiting time for the heating cylinder, and not having a complicated structure unlike conventional rotary tables.

In addition, each work station can be placed at any location on the rail, so by setting it at an appropriate position taking into consideration the surrounding work environment, workers will not be grouped together and will be able to This has the advantage that work can be done in locations with good workability.

Furthermore, according to the present invention, the upper and lower molds 4 and 5 of the mold device 3 are not only opened and closed by receiving the working medium supplied from outside the mold device, but also by receiving the supply of the medium and molding. A mold clamping cylinder 6 is provided, which continues to maintain the mold clamped state (holding pressure) when the supply and discharge of the medium is cut off, and is fixed to a mold clamping station B provided in the rail 1. A working medium is supplied to the mold device 3 located at the mold clamping station B from the working medium supply device 15 disposed at the mold clamping station B via the port connector 23 fitted into the port connector guide hole 25 of the mold device 3. , for the mold device 3 that clamps the molds 4 and 5, and after that, leaves the mold clamping station B and is transferred to a non-working station (an area other than mold opening/closing station A and mold clamping station B). is arranged integrally within the mold device 3 by cutting off the supply and discharge of the working medium through the port connector guide hole 25 and holding the molds 4 and 5 in a clamped state. The mold clamping cylinder 6 itself aims to maintain the mold clamping state continuously, and is based on the prior art (Japanese Patent Publication No.
Unlike the configuration proposed in No. 8346), the mold clamping state is not maintained continuously using an auxiliary cylinder such as a mold opening/closing booster, so when the mold clamping state is continuously maintained (holding pressure), the mold 4 , 5 can be maintained at a high pressure value approximately equal to the mold clamping pressure, and thus can be used for injection molding operations of a wide range of thermosetting resins. There are also some effects.

Moreover, when the mold device 3 located at the mold clamping station B performs mold clamping, the mold device 3 does not operate by receiving a force transmitted from the outside by mechanical displacement; By being configured to operate in response to the force transmitted by the movement of the working medium, typically air or oil, supplied from the working medium supply device 15 located at the tightening station B via the port connector 23. , the same prior art (Special Public Interest Publication 1977-
Unlike the configuration proposed in No. 8346), there is no need to bury the mold clamping cylinder itself in the foundation 7 in the mold clamping station B, and the ram 10 of the mold clamping cylinder buried there and the ram's There is no need to pay special attention to mechanical alignment (in particular, securing a joint plane) with the movable seat plate 11 that is subject to displacement, and the port connector 23 from the working medium supply device 15 is connected to the port of the mold device 3. Connector hole 25
It is sufficient that the working medium supply device 15 can be fitted into the mold clamping station B.
The mold clamping station B can be freely selected without being subject to any restrictions, and it also has the advantage of being able to flexibly deal with changes in the position of the mold clamping station B in the existing equipment.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIGS. 1 to 3 are front views of the mold opening/closing station, in which FIG. 1 is a diagram in the mold opening state, FIG. 3 is a diagram of the unlocked state, FIG. 4 is a diagram of the transfer state of the mold device, FIG. 5 is a front view of the mold clamping/injection station, FIG. 6 is a plan view illustrating the movement of the mold device on the rail, and FIG. FIG. 7 is a block diagram showing the internal structure of the mold clamping cylinder. 1...Rail, 3...Mold device, 4...Upper mold, 5
... lower mold, 6 ... mold clamping cylinder, 7 ... upper mold plate, 8 ... lower mold plate, 9 ... cross plate, 15
... Working medium supply device, 16 ... Guide table,
17... Connection cylinder, 18... Pressure source, 20
...Index stopper, 23...Port connector, 26...Heating tube, 28, 28'
...Pallet, 30,30'...Transfer cylinder,
A... Mold opening/closing station, B... Mold clamping/injection station.

Claims (1)

[Claims] 1. A rail 1 formed in a closed circuit, and a mold opening/closing station A provided in the rail 1.
A mold clamping station B provided in the rail 1; A mold device 3 movably mounted on the rail 1 and equipped with upper and lower molds 4 and 5 disposed opposite each other so as to be able to open and close the mold and clamp the mold. , a working medium supply device 1 fixedly disposed separately at mold opening/closing station A and mold clamping station B;
5, and transfer means 30, 30' for transferring the mold device 3 along the rail 1, and the mold device 3 is supplied with working medium from the working medium supply device 15 at the mold opening/closing station A. Then, the upper and lower molds 4 and 5 are opened and closed, and the mold clamping station B receives the working medium from the working medium supply device 15 and clamps the upper and lower molds 4 and 5. After the mold is clamped, the supply and discharge of the working medium from the working medium supply device 15 is cut off, and the clamping cylinder 6 continues to maintain the clamped state of the mold, and the working medium supply pipe supplies the working medium to the cylinder 6. A port connector guide hole 25 connected to one end of the mold opening/closing station A is disposed, and the working medium supply device 15 provided at the mold opening/closing station A has a port connector of the mold device 3 located at the mold opening/closing station A. A port connector 23 is provided that fits into the guide hole 25 and allows the working medium from the pressure source 18 to be supplied to the mold clamping cylinder 6 of the mold device 3, and is connected to the working medium supply provided in the mold clamping station B. The device 15 includes a port that fits into the port connector guide hole 25 of the mold device 3 located at the mold clamping station B, and allows the working medium from the pressure source 18 to be supplied to the mold clamping cylinder 6 of the mold device 3. An injection molding machine characterized by being provided with a connector 23.