JP2992934B2 - Media path device for mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold temperature adjusting medium path device for supplying a medium to a mold in order to maintain the mold at a predetermined molding temperature. And a mold medium path device capable of exchanging a medium even during molding.

[0002]

2. Description of the Related Art When molding a predetermined product using a mold, it is necessary to maintain the mold at a predetermined appropriate temperature, and the temperature of the mold is adjusted using a medium such as a heat medium oil or cooling water. It is carried out. More specifically, a normal mold is composed of a movable mold and a fixed mold, and each mold has a medium passage penetrating therethrough. For example, a mold temperature controller, which is a heat medium source, is connected to a connecting hose. −
If the mold is heated by circulating a heat medium by directly connecting it to the medium path of the mold via a heat sink, and if you want to suppress the temperature rise of the mold due to the heat of the molding resin, The connection hose of the heat medium is removed from the medium passage of the mold, and the connection hose of the cooling water is attached to the medium passage of the mold.

However, according to such conventional means, when the medium supplied to the medium path provided in the mold changes, the connection hose is changed for each connection hose, so that the connection hose is removed from the mold. When the medium is removed and replaced, the remaining medium in the medium path of the connection hose or the mold spills and adheres to the operator's hand or soils the machine. There is a danger of danger. In addition, not only when the medium needs to be replaced, but also when the mold is frequently changed in small lots, the connection hole is changed from the mold every time.
Since it is necessary to remove the connection hose, there is a similar problem that the residual medium is spilled, and there is also a trouble that the connection hose is frequently replaced.

Further, when a medium is supplied to a mold, the connection hose is directly connected to a medium passage provided in the mold. Therefore, when the molding machine is operating, the connection hose is connected. The media could not be removed and the media could not be changed. Conventionally, the medium sent from the mold temperature controller to the mold is heated when passing through the mold heated by the heat of the resin injected into the mold, and may rise above a set temperature. In addition, since the operation is performed while cooling the medium in the medium storage tank of the mold temperature controller with water (referred to as a cooling operation), unnecessary costs have occurred. In this case, if the medium can be removed or changed during the operation of the molding machine, it is considered that other means for continuing the molding without performing the cooling operation of the mold temperature controller can be taken.

On the movable mold side, as the mold moves, a connection hose connected to the mold and a machine body,
If the tie bar, the shooter, and the like are rubbed and left unattended, the connection hose may be damaged, leading to leakage of the medium, which is dangerous especially when the medium is at a high temperature.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a first object of the present invention is to make it possible to remove a medium in a medium path satisfactorily. It is in. A second object of the present invention is to make it possible to remove a medium from a medium path and to exchange a medium even when a molding machine is in operation. A third object of the present invention is to prevent friction between a connection hose for supplying a medium and a machine body, a tie bar, a shutter, or the like.

[0007]

Means for solving the problems The technical means adopted by the present invention is a mold for adjusting the temperature of a mold by supplying a medium to a medium path provided in the mold. In the medium path device, the device includes a medium sending port, at least one or more medium inlets, a medium sending block in which a medium outlet is fluidly connected to each other, a medium returning port, at least one or more medium outlets, and a medium. A return medium block in which the discharge ports are in fluid communication with each other, a medium supply path that fluidly connects the medium supply port and the mold medium inlet, and a fluid communication connection between the return medium port and the mold medium outlet. And a medium return path, wherein at least one of the medium inlet and the medium outlet is connected to an appropriately selected medium source. Other technical means adopted by the present invention include a medium sending port, a medium sending block having at least two or more medium inlets in fluid communication with each other, and a medium returning port, at least two or more medium outlets in fluid communication with each other. And a return block formed as described above.

[0008] By connecting the medium source and the mold through a mold medium path device having a medium sending block and a medium returning block, the medium can be exchanged even when the molding machine is operating. It has become possible. The medium means a fluid that heats or cools the mold by passing through the inside of the mold to bring the mold to a desired temperature, such as cooling water or mold temperature. Refers to the known heat transfer oil supplied by the regulator. The medium source has a function of controlling the mold temperature, such as a mold temperature controller, a cooling water device attached to the molding machine, and a chiller.

Since the mold and the medium supply source are connected via the medium path device, the medium supply path and the return medium path can be permanently provided on the mold side. If the path and the return path are mounted beforehand so as not to come into contact with the machine body, tie bar, shutter, etc., the medium path (the transfer path C and the return path D) may be damaged. There is no.

To remove the medium from the medium path, the medium inlet and the medium outlet are closed, and the medium outlet is opened. Then, air is introduced from one medium outlet and the remaining medium is discharged from the other medium outlet. However, in this case, the position of the discharge port needs to be lower than that of the molding machine mold.
When the cooling medium and the heating medium are of the same type,
The medium outlet may not be used.

To efficiently remove the medium, it is preferable to close the medium inlet and force the compressed air into the medium path. First, by introducing the compressed air into the medium path, most of the medium remaining in the medium path can be discharged from the medium outlet. (The medium discharged from the medium outlet is close to the medium outlet and has a check valve. It is only necessary to prevent backflow of the discharged medium by providing the.). Then, by closing the medium outlet and the medium inlet, opening the medium outlet, and introducing compressed air, the remaining medium is discharged from the medium outlet. Further, if an air intake cock is provided at an appropriate portion of the medium path to introduce air, a medium removal similar to the use of compressed air can be performed. Further, the residual medium in the medium path may be forcibly sucked and discharged by using a vacuum device.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a mold medium path device. The device includes a medium feeding port, at least one or more medium inlets 2 (2a, 2b), and a medium discharging port 3 which communicate with each other. Block A, a medium return port 4, at least one or more medium outlets 5 (5a, 5b), and a medium return block B having a medium discharge port 6 communicated with each other. The ports constituting the blocks A and B may be connected to each other and be in fluid communication. However, as a preferred embodiment in the drawing, the block A for medium transfer and the block B for medium return are respectively connected to the manifold for medium transfer, This figure shows a structure constituted by a medium manifold.
Further, the medium-transmitting block A and the medium-returning block B may be mounted on the mold side, may be mounted on the medium source side (for example, a mold temperature controller), or may be mounted on the mold. Or a medium source may be provided separately.

The molding die 7 is usually composed of a movable die and a fixed die, but only one die is shown for convenience. The die 7 has a die medium path 7a penetrating therethrough. One end of the die medium path 7a is a die medium inlet 7b, and the other end is a die medium outlet 7c. The mold medium inlet 7b at one end of the medium passage 7a penetrating the medium supply port 1 and the mold 7 is
The mold medium outlet 7c at the other end of the medium path 7a and the medium return port 4 are connected by a medium return path D. A plurality of medium transfer paths C and return medium paths D may be provided in a branched manner, so that the medium is supplied from one block A, B to a plurality of molds (for example, a pair of movable molds and a fixed mold). can do. Further, the medium feeding path C and the return medium path D
Is a common medium supply path irrespective of the type of medium, and is preferably formed from a material that can be used for all possible mediums.

Preferably, the medium feeding path C and the medium returning path D are permanently provided in the molding machine mold in a detachable manner. In particular, the medium path on the movable mold side is a medium path mounted on the movable mold that reciprocates using a medium path holder or a device such as a combination of fixed metal piping and a hose. It is mounted in such a manner that contact with tie bars, shooters, etc. is restricted.

The medium inlet 2 and the medium outlet 5 are connected to
Or multiple locations. Preferably, the media inlet 2 is
A heat medium inlet 2a is connected to a mold temperature controller as a heat medium source, and a cooling medium inlet 2b is connected to a cooling water supply port. It comprises a heat medium outlet 5a connected to the machine and a cooling medium outlet 5b connected to the cooling water outlet. In the figure, reference numeral 8 denotes a tray, which accommodates the medium discharged from the medium discharge ports 3 and 6.

Block A for feeding medium and block B for returning medium
Are preferably provided with compressed air inlets 9, 10, respectively.
Appropriate connection hoses are connected to the medium inlets 2a and 2b, the medium outlets 5a and 5b, the medium outlets 3 and 6, and the compressed air inlets 9 and 10, respectively. Yes, the supply and discharge of fluid can be controlled freely. Specifically, the compressed air inlets 9 and 10 have valves 11a and 11e, the medium inlet 2a has valves 11b and
A valve 11c is provided at the medium inlet 2b, a valve 11f is provided at the medium outlet 5a, a valve 11g is provided at the medium outlet 5b, valves 11d and 11h are provided at the medium outlets 3 and 6, and a medium supply port 1 and a return medium port 4 are provided. Valves 11k and 11l are provided. The valve is preferably provided in the vicinity of the connection portion, but the mounting portion is not limited as long as it can control the flow of the medium or compressed air into and out of the mold medium path device.

It is preferable to provide an air intake cock in at least one of the mold medium inlet 7b and the mold medium outlet 7c. It is preferable to provide at least one or more air intake cocks 11j at appropriate locations of the medium feeding path C and the return medium path D. In the drawing, the air inlet cocks 11i and 11j are provided in the mold medium inlet 7b and the return medium path D. As shown in FIG. 6, a plurality of in-mold medium paths 7a are formed inside the mold 7, and when each of the in-mold medium paths 7a is connected by the connection pipe M, The mold medium inlets are 7b and 7b ', and the mold medium outlets are 7c and 7c'. Regarding this, it is preferable to provide the air intake cock 11i in the same manner as described above. Note that an air intake cock 11m may be provided in the middle of the connection pipe M.

At the time of normal molding, the mold is provided with a magnet attraction type thermometer (not shown). By confirming the mold temperature at the time of molding, a mold temperature controller, a cooling water valve and the like are operated. The mold temperature is controlled by operation. Also,
The temperature sensor 12 is attached to the mold 7 and the medium inlet 2
a, a solenoid valve 13 operated by a signal from a temperature sensor 12 provided in a mold 7 at the medium inlet 2b or the medium feeding port 1
a, 13b and 13c may be provided. That is, the mold 7
A temperature sensor 12 is provided at at least one of the medium inlet 2 and the medium feeding port 1, and solenoid valves 13a, 13b, 13c are provided at the temperature sensor 12.
The solenoid valve is opened and closed by the signal of In this apparatus, a temperature sensor 12 is attached to a mold 7, and a signal from the temperature sensor 12 activates a solenoid valve provided at the medium inlets 2a, 2b or the medium feeding port 1, thereby enabling precise temperature control of the mold. still,
The solenoid valve may be detachably connected, for example, by connecting a coupler, and only a valve necessary for molding may be mounted as needed.

The operation method of such an apparatus will be described. In the case where there is one medium inlet 2 and one medium outlet 5, first, the medium inlet 2, the medium outlet 5, the medium outlet 3,
6. Close the connection port of 6, and then the medium required for mold temperature control,
For example, cooling water for cooling the mold, heat medium oil from a mold temperature controller for warming the mold, and the like are connected to the medium inlet 2 from the medium source. The medium outlet 5 is connected to a cooling water outlet for cooling water or a mold temperature controller for heat medium oil, so that the medium circulates through the medium path 7a of the mold 7.

When the medium inlet 2 and the medium outlet 5 are opened, the medium enters from the medium inlet 2, passes through the mold medium path 7 a of the mold 7, flows to the medium outlet 5, and flows through the mold 7. Mold temperature control is performed. To discharge the medium in the medium path (C, 7a, D), the medium inlet 2 and the medium outlet 5 are closed, and the medium outlets 3 and 6 are opened. Then, since the medium outlets 3 and 6 are provided below the position of the molding machine mold, air enters the medium path from one medium outlet, and the medium escapes from the other medium outlet. Also, when the medium path or the medium source is replaced or the mold is replaced, the residual medium in the medium path does not spill and adhere to the hands of the workers, and does not stain the machine.

Next, an operation method in which a plurality of medium inlets 2 and medium outlets 5 are provided, and compressed air inlets 9 and 10 are provided in a medium sending block A and a medium returning block B will be described. Here, the cold mold before the start of work is warmed by a mold temperature controller, and when the molding work is started, the mold temperature rises with the lapse of time due to the heat of the resin injected into the mold, and water cooling is performed. Let us consider a case where the set mold temperature can be maintained.

First, all the connection ports are closed. The medium inlet 2a is connected to a medium transfer hose of a mold temperature controller, and the medium inlet 2b is connected to a supply hole for supplying water for mold cooling.
Succession. A medium outlet 5a is provided with a medium return outlet of the mold temperature controller.
And a connection hose for discharging the cooling water to the medium outlet 5b. Next, when the medium inlet 2a and the medium outlet 5a to which the mold temperature controller is connected are opened, the heat medium circulates while flowing in the mold.

When the temperature of the mold rises to the set temperature by the mold temperature controller, the molding operation is started. Here, mold 7
When the mold temperature rises over time due to the heat of the resin injected into the mold and the mold temperature controller is turned off, if the mold temperature starts to rise above the set temperature, the mold temperature controller is stopped. And
The medium inlet 2a is closed. The compressed air inlet 9 is slowly opened slightly while the medium outlet 5a remains open. By doing so, air enters the medium path (C, 7a, D) and the medium in the medium path is returned to the medium tank from the medium return port of the mold temperature controller.

Next, the compressed air inlet 9 is closed, and the medium outlet 5 is closed.
When the medium inlet 2a is opened and the compressed air inlet 10 is slowly opened, the medium remaining in the medium path is returned to the medium feeding pump from the medium feeding port of the mold temperature controller. Compressed air inlet 10,
The medium inlet 2a is closed. Check that all connections are closed. Most of the media is now returned to the mold temperature controller. Next, the medium path of the mold medium path apparatus is cleaned again. When the medium outlet 6 is opened and the compressed air inlet 9 is slowly opened, the remaining medium is discharged from the medium outlet 6. The compressed air inlet 9 is closed, and the medium outlet 6 is also closed. Media outlet 3
Then, when the compressed air inlet 10 is opened, the remaining medium is discharged from the medium discharge port 3, and preparation for flowing the next medium through the medium path is completed.

Here, a description will be given of a method of removing the medium only from the mold medium path device without returning the medium to the mold temperature controller. First, make sure that all ports are closed.
When the medium outlets 3 and 6 are opened, since the medium outlets 3 and 6 are below the molding die, air enters from one of the medium outlets, and the medium in the medium path is approximately more than the other medium outlet. Get out. Next, when the medium outlet 3 is closed and the compressed air inlet 9 is slightly opened, the remaining medium in the medium path exits from the medium outlet 6. Next, when the compressed air inlet 9 is closed and the medium outlet 6 is also closed, the medium outlet 3 is opened, and the compressed air inlet 10 is slowly opened, the remaining medium is discharged from the medium outlet 3. It is assumed that the discharged medium is taken in the tray 8. This completes the preparation for flowing the next medium.

Next, when it is confirmed that all the connection ports are "closed" and the medium inlet 2b and the medium outlet 5b are opened for cooling the mold, a mold cooling medium path using water as a medium is completed. The medium passing through the mold 7 is changed to water to form a cooling water circuit,
The temperature of the mold is controlled while adjusting the amount of cooling water by operating the cooling water valve 11c. The mold temperature is measured while observing a magnet adsorption type thermometer (not shown) attached to the mold. Here, the method of discharging the medium in the cooling water circuit will be described again. First, the medium outlet 5b is kept open, the medium inlet 2b is closed, the compressed air inlet 9 is slowly opened, and compressed air is introduced into the medium path. Then, the medium in the medium path (C, 7a, D) is pushed out from the medium outlet 5b.

The medium discharged from the medium outlet 5b is discharged while pushing down the floats of the check valve 18 and the flow meter 18a. The pressed-down float becomes less viscous when the amount of discharged medium decreases and the compressed air and the medium start to mix, and the position of the pressed-down float becomes unstable. When this occurs, the residual medium in the medium passages (C, 7a, D) has disappeared. Normally, pressure is applied to the cooling water outlet 5b to send the cooling water back to the cooling tower.
8, the cooling water does not flow backward even if the closing of the medium outlet 5b is delayed.

Next, when it is desired to further clean the inside of the medium path due to the use of different types of media, all the valves are closed, the medium outlet 6 is opened, and the compressed air inlet 9 is slowly opened. Is discharged. Next, the compressed air inlet 9 is closed, and the medium outlet 6 is also closed. When the medium outlet 3 is opened and the compressed air inlet 10 is opened, the remaining medium is discharged from the medium outlet 3, and there is no remaining medium in the medium path (C, 7a, D). As described above, the medium in the medium path connected to the mold can be changed even during the operation of the molding machine, and the mold temperature controller does not need to be moved by the cooling operation unnecessarily as in the related art.

The method of discharging the medium in the case where the air intake cocks 11i and 11j are provided will be described. First, when the medium outlets 3 and 6 are opened, air enters from one of the medium outlets, and the medium exits from the other medium outlet. Comes out. Next, when one of the air intake cocks 11i and 11j is opened, the remaining medium is removed. In this case, the medium can be removed from the compressed air inlets 9 and 10 in a manner similar to the case where compressed air is used. Alternatively, compressed air may be introduced from an air intake cock. Also, as shown in FIG. 6, when there are a plurality of in-mold medium paths 7a inside the mold 7 and they are connected by the connection pipe M, the air intake cock 11
m, the same medium can be removed using the air intake cock 11i provided at the mold medium inlets 7b, 7b 'or the mold medium outlets 7c, 7c'. Further, instead of the connection pipe, the cover 7c 'and 7b' may be covered by a cover (not shown). In this case, an air intake cock may be provided on the cover.

When scales or the like accumulate at the connection between the medium inlet 2 and the medium outlet 5 and the valves (11b, 11c, 11f, 11g) connected thereto, the blocks A and B for sending and returning the medium are returned. The valves (including the valves 11k and 11l) are all closed and the media discharge valves on the side of the block to be cleaned are opened and connected to the media inlet valves 2a and 2b and the media outlet valves 5a and 5b. Compressed air is introduced from a valve to discharge a scale or the like from a medium discharge port.

FIGS. 2 and 3 show a mold medium path device connected to a mold temperature controller 14 and a cooling water supply port and a cooling water discharge port (not shown), respectively. It is possible to remove the medium in the medium path, to allow each medium to flow without mixing, and to flow separate media to adjust the mold temperature. FIG. 2 shows a mold temperature controller 14.
In this figure, the block A for medium transfer and the block B for medium return of the mold medium path device are used for the medium transfer port and the medium return port.

In FIG. 2, the temperature of the mold is controlled by the temperature sensor 12 provided on the mold 7 using one of the solenoid valves 13a and 13b. For example, the mold 7 is warmed by the mold temperature controller 14 to start molding, and the temperature of the mold rises over time due to the heat of the injected resin, and the mold temperature controller 14 performs the cooling operation. , The temperature controller 14 is turned off, the medium is drained from the medium path, then cooling water is flown, and the temperature sensor 12 provided on the mold 7 turns the solenoid valve 13b “ON” / “O”.
The temperature of the mold is adjusted by adjusting the amount of the cooling water in the FF. That is, the amount of cooling water is adjusted not by operating the cooling water inlet valve 11c but by operating the solenoid valve 13b based on a signal from the temperature sensor 12. During this time, there is no need to stop the molding machine.

For example, in the case of severe molding at a mold temperature of 80 ° C. as a molding condition, the mold temperature is raised to 80 ° C. by a mold temperature controller, but the mold temperature controller is turned off. In this case, the mold temperature may not be maintained at 80 ° C. only by the heat of the injected resin. When the mold temperature is raised to 80 ° C. and molding is started, the heat of the injected resin also acts over time, and the mold temperature gradually increases from 80 ° C., so the set temperature of the mold temperature controller is reduced. Gradually lower the mold temperature to 80 ° C. Therefore, when the solenoid valve 13a operated by a signal from the sensor 12 provided in the mold 7 is turned "ON", the medium from the mold temperature controller 14 is cut off, and when the mold temperature falls, the solenoid valve 13a is turned "OFF". So that the medium flows and the solenoid valve 13a is turned "ON" / "O".
FF "controls the mold temperature. In FIG. 2, the control unit of the solenoid valve is provided in the mold temperature controller 14. The connection between the temperature controller and the solenoid valve can be switched by a changeover switch. When connected to the solenoid valve 13b, the valve 11b of the mold temperature controller is "closed" and the cooling water valve is closed. 11
c is used in an “open” state. On the other hand, the solenoid valve 13
a, the valve 11b of the mold temperature controller
Is "open" and the cooling water valve 11c is "closed".

In FIG. 3, the control section of the solenoid valve is controlled by a temperature controller 15 separate from the mold temperature controller 14, and further, the operation of the solenoid valves 13a and 13b in FIG. The operation is performed by one solenoid valve 13c provided near the mouth 1. Further, the compressed air inlets 16 and 17 are provided at the medium supply port and the medium return port of the mold temperature controller 14, and the medium in the medium path can be returned to the tank satisfactorily by introducing the compressed air. ing.

When the medium is discharged from the medium outlet to the temperature controller 14, since the temperature controller is stopped, no pressure is applied to the discharge side, and no check valve is required. Further, a medium supply path and a medium recovery path between a medium supply source (for example, a mold temperature controller and a cooling water tank) and a mold medium path device may be branched, so that one medium supply source is provided. Can supply the medium to a plurality of mold medium path devices. The mold temperature controller 14 of FIG. 2 may be a similar one having a function of controlling the mold temperature, such as a mold cooling circulator.

FIG. 4 shows another embodiment of the medium-transmitting block A and the medium-returning block B, in which the ports of the medium-transmitting block A and the medium-returning block B are inserted in the block. They are in communication with one another via directional valves provided. Medium supply port 1,
The medium inlets 2a and 2b and the medium outlet 3 are a block A for medium feeding.
Are connected to each other via a switching valve 11A provided therein. The medium return port 4, the medium outlets 5a and 5b, and the medium discharge port 6 are connected to each other via a switching valve 11B provided in the medium return block B. Each connection port (medium inlets 2a, 2b, medium outlets 5a, 5a,
b, the medium outlets 3 and 6) are opened and closed, and FIG. 4 shows a state in which the medium inlet 2a and the medium outlet 5a are "open", and the medium inlet 2b and the medium outlet 5b are "closed". Switching valves 11A, B
The medium inlet 2a and the medium outlet 5a are "closed", the medium inlet 2b and the medium outlet 5b are "open", or in the neutral position (the medium outlets 3 and 6, the medium feeding port 1, and the medium returning port 4 Communication) can be selected.

Medium inlets 2a, 2b, medium outlets 5a, 5b
Are connected to switching valves 30 and 31 for reversing the medium flow path, and the switching valves 30 and 31 periodically reverse the flow path of the medium flowing in the medium paths (C, 7a, D), thereby The temperature difference between the medium inlet side of the mold and the medium outlet side of the mold is eliminated. The switching valves 30 and 31 are in communication with the respective medium sources, and are connected to the medium feeding side of the medium source and the switching valves 30 and 31.
Switching valves 13 a ′ and 13 b ′ for opening and closing the flow path of the medium liquid for adjusting the temperature of the mold 7 by a signal from the sensor 12 are connected between the pressure side ports. Having multiple types of media connection ports, media can be removed from the media path, each media can be flowed without being mixed, separate media can be flowed, mold temperature can be adjusted, and variation in mold temperature can be prevented. It is a device that can do.

The controller 20 is provided with a temperature controller for controlling the temperature of the mold, and is connected to the sensor 12 for transmitting a signal from the mold 7, and receives the output of the temperature controller.
It has a function of operating the switching valves 13a 'and 13b' for controlling the medium sent from each medium source to the medium passage in the mold for mold temperature adjustment. Further, it has a switch for reversing the medium flow path, and is used when it is desired to reverse the medium flow path flowing to the mold. In order to reverse the flow path of the medium sent from each medium source to the medium path in the mold, and to eliminate the variation in the temperature of the mold, the switching valves 30 and 3 are set in accordance with the set time of the timer.
1 has the function of operating This switch can also operate the solenoids of the switching valves 30 and 31 separately.

When the control valve is at the neutral position, the switching valves 30 and 31 cut off the supply of the medium to the medium paths (G, H, K, and L), and are switched by the excitation of the solenoids 30b and 31b. When the controller moves, the medium paths G and K are connected to the medium supply ports of the medium source, and the medium paths H and L are connected to the medium return ports of the medium source. Further, when the other solenoids 30a and 31a are excited, the medium paths G and K, the medium return ports, the medium paths H and L
And the medium supply port of the medium source are connected. Thus, the switching valve 3
The positions of the output ports are changed by the operations of 0 and 31, and the flow of the medium for adjusting the temperature of the mold is reversed. The solenoids (30a, 30a) of the switching valves 30, 31
b, 31a, 31b) is provided with a timer circuit, and when the medium path reversing switch is turned on, the timer circuit causes the solenoids 30a, 30b or 31a, 31b to be periodically "ON" in a cycle of a predetermined time. "OFF" is repeated. The switching valves 13 a ′ and 13 b ′ transmit signals from the sensor 12 connected to the mold to the control device 20.
And controls the temperature of the mold by operating the medium from each medium source according to the instruction.

Medium inlets 2a, 2b, medium outlets 5a, 5b
Switching valves 30, 3 for periodically reversing the flow of the medium
A mold temperature controller 14 and a cooling medium source 19 (a cooling device attached to the molding machine, a chiller, etc.) are connected via the first heating device 1. Switching valves 30 and 31, mold temperature controller 14, and cooling medium source 19
A switching valve 13a 'operated by a signal of the sensor 12 during
13b 'is connected.

The method of using this device will be described.
Here, the cold mold before the start of work is warmed, and when the molding work is started, the temperature of the mold rises with the lapse of time due to the heat of the resin injected into the mold, and the optimum temperature of the mold is cooled by water cooling. Think about where you can keep

First, the mold temperature controller 1 is connected to the medium inlet 2a.
And a cooling medium source 19 at the medium inlet 2b.
A connection hose for cooling the mold from the mold, a medium return 5a is a return hose from the mold temperature controller 14, and a medium outlet 5b is a hose for discharging cooling water from a cooling medium source. Then, each medium source is connected via the switching valves 30, 31, 13a ', 13b'. Then, if the medium inlet 2a and the medium outlet 5a of the mold temperature controller are opened, the heat medium circulates in the mold. I do.

When the temperature of the mold rises with the lapse of time due to the heat of the resin injected into the mold and the appropriate temperature for molding can be maintained by water cooling, the mold temperature controller 14 is stopped and the medium inlet 2a Is closed (the flow path switching valve 11A in the manifold A is in the neutral position). When the compressed air inlet 9 is slowly opened with the medium outlet 5a kept open, the compressed air is introduced into the medium path, and the residual medium passes through the medium outlet 5a from the medium paths C, 7a, and D, and the switching valve from the medium path H. After passing through the central position of 30, the medium returns to the medium return port.

Next, the compressed air inlet 9 is closed and the medium outlet 5 is closed.
a is also closed. Next, the medium inlet 2a is opened, and the compressed air inlet 1 is opened.
When 0 is opened, the remaining medium passes through the medium paths D, 7a, C, and G, passes through the center position of the switching valve 30, and is returned to the medium source and the medium return port. Further, when it is desired to clean the medium path, the flow path switching valves 11A and 11B of the manifolds A and B are set to the neutral position, the medium discharge valve 11h is opened, and the compressed air inlet 9 is opened. It is discharged from the outlet 6.

After confirming that all the connection ports are "closed" and opening the medium inlet 2b and the medium outlet 5b for cooling the mold, a mold cooling medium path using water as a medium is completed. A cooling water circuit is formed by replacing the medium passing through the mold 7 with water, and the amount of the cooling water is determined by operating a flow path switching valve, operating a medium sending valve for the cooling water medium, or the like. Thus, the medium in the medium path connected to the mold can be changed even during the operation of the molding machine, and the mold temperature controller does not need to be moved by the cooling operation unnecessarily as in the conventional case. Therefore, it is possible to freely change the heating medium and the cooling medium.

For example, when the mold is large and the medium path in the mold is long (when the medium path is provided in the mold multiple times), the temperature of the mold at the medium inlet and the medium outlet of the mold medium path is increased. A difference occurs and the temperature of the mold becomes non-uniform, so the expansion rate of the mold changes, and the union of the elaborate molds becomes fragile, and excessive force acts on the mold, making it unsuitable for molding work. When the user feels that the mold may not be clamped at low pressure, the switching valves 30 and 31 are activated by turning on the medium path reversing switch of the control device 20, and the flow of the medium flowing through the mold is changed. The temperature distribution of the mold is also reversed, the distortion due to the temperature change of the mold is reduced, and the combination of the molds can be made smooth, so that the mold can be prevented from being damaged due to "galling" of the mold. Also in the molded product, the distortion is reduced because the temperature distribution of the mold is averaged. In this connection, conventionally, since the medium always flows in a fixed direction in the mold, a temperature difference occurs in the mold, and the expansion rate of the mold becomes nonuniform. When the mold and the fixed mold are united, there are cases where the mold cannot be closed with a low mold clamping pressure. Along with this, excessive force has occurred in the sliding portions such as the united portions (guide pins and guide bushes) of the mold and the slide core.

How to use the switching valves 13a 'and 13b' will be described. As shown in FIG. 4, a heating medium source 14 is provided at the medium inlet 2a and the medium outlet 5a, a cooling medium source 19 is provided at the medium inlet 2b and the medium outlet 5b, and switching valves 30, 31, and 13 are provided.
a ', 13b'. For example, the molding conditions are not so severe, and the mold temperature of the natural body at the start of molding is 20 mm.
If you want to perform molding at a mold temperature of up to 40 degrees using water for cooling, first set the temperature controller of the control device 20 to 40 degrees, and excite one of the solenoids 31a, 31b of the switching valve 31. In this case, the medium flow path does not reverse.

First, the mold temperature control switch of the control device 20 is turned "ON", the medium inlet 2b and the medium outlet 5b of the cooling medium source 19 are opened, and molding is started. The temperature of the mold rises due to the heat of the resin.
The switching valve 13a 'is operated by the output of the temperature controller within 0, and the mold temperature is maintained at 40 degrees while "ON" and "OFF" the cooling medium flowing to the mold. Also, for example, when molding at a mold temperature of 80 degrees as a severe molding condition, the mold temperature is raised to 80 degrees by a mold temperature controller, but the injection is performed when the mold temperature controller is turned off. If the mold temperature cannot be maintained at 80 degrees by the heat of the resin alone, first, the temperature controller of the control device 20 is set to 80 degrees, and one of the solenoids 30a and 30b of the switching valve 30 is excited. In this case, the medium flow path does not reverse. Medium inlet 2a, medium outlet 5
a, the medium from the heating medium source 14
When it is time, start the molding operation. As the operation continues, the mold temperature rises slightly due to the heat of the injected resin. Upon receiving a signal from the sensor 12, the switching valve 13 a ′ is operated by the output of the temperature controller in the control device 20, and the heat medium flowing to the mold is turned “ON” and “OFF” to reduce the mold temperature to 80 degrees. keep.

Although the switching valves 30 and 31 for reversing the medium flow path and the switching valves 13a 'and 13b' for controlling the mold temperature have been described separately, they may be used together. In addition, the directional control valves 11A, 1A in the manifolds A, B
1B may be an automatic valve.
B, 13a ', 13b', 30, 31 may be linked. The type of the switching valve is not particularly limited, and may be a spool moving type or a rotating type (such as a ball valve).

As still another embodiment, a method for discharging the medium remaining in the pocket portion when the mold medium path has a pocket portion will be described. As shown in FIG. 5, for the purpose of improving the molding cycle, holes are vertically and horizontally formed in the mold 7 in order to improve the cooling of the mold core and the like, and the mold 7 is closed with an airtight stopper 700 from the outer surface, and the core is closed. Formed,
Therefore, a pocket is formed in the medium passage in the mold. Pocket portions 70a, 70b, 70c, 70 of the media path in the mold
If cooling water is stored in d, the part of the sealing plug will be eroded,
If the management is poor, the cooling water may ooze out and damage the mold. Therefore, when the mold is removed from the molding machine after the completion of the molding operation, it is necessary to sufficiently discharge the residual water in the pocket of the medium passage in the mold. In the present embodiment, the residual water in the pocket is discharged by alternately introducing compressed air into the mold medium path entrance 7b and the mold medium path exit 7c.

A cooling medium source 19 (a cooling device attached to a molding machine in the present embodiment) is connected to the medium inlet 2b of the medium feeding block A and the medium outlet 5b of the medium feeding block B. When the medium outlet 5b is opened, a cooling water circuit is formed, and the cooling water circulates between the mold 7 and the medium source 19. When the molding machine is removed from the mold after the molding operation is completed, first, the medium inlet 2b is closed, the compressed air inlet 9 is slowly opened, and the medium in the medium path (C, 7a, D) is compressed by the compressed air to the medium outlet 5b. The medium is returned to the medium source 19, and the medium outlet 5b is closed. Thus, the medium in the medium path (C, 7a, D) was almost discharged.

When the medium discharge port 6 is opened and the compressed air inlet 9 is opened, the compressed air that has entered the medium path enters the in-mold medium path 7a through the mold medium inlet 7b, and pockets in the flow direction of the compressed air flow. The residual water 70a, 70b is discharged from the mold medium outlet 7c through the medium discharge port 6. When the compressed air inlet 9 and the medium outlet 6 are closed, then the medium outlet 3 is opened, and the compressed air inlet 10 is opened, the compressed air introduced into the medium path is transferred from the mold medium outlet 7c to the medium path 7a in the mold. Then, the residual water in the pockets 70c and 70d in the direction of the flow of the compressed air is pushed out from the mold medium inlet 7b to the medium discharge port 3 and discharged. This operation may be repeated again depending on the state of the pocket in the medium path in the mold.

[0053]

The present invention described above has the following effects in particular. Since the medium in the medium path can be pulled out by introducing air into the medium path, when removing the medium path from the mold,
No residual media in the media path is spilled and the machine is not soiled. Furthermore, if compressed air is used or an air intake cock is provided, the medium in the medium path can be more efficiently removed. Since the connection to the mold is performed by the permanent medium path, the medium transmission path and the return medium path, it is not necessary to connect an appropriate medium directly to the mold from each medium source. It is convenient to connect to a mold medium path device. Since the medium can be removed freely and a plurality of media can be connected, it is easy to change the medium to cooling water by a temperature controller in the case of trial molding (molding temperature is undecided). it can. Also, for example, a mold that has been cooled before the start of work is warmed by a temperature controller, and the work is started, and as time elapses, the mold temperature rises due to heat of the resin injected into the mold, and is set by water cooling. When the mold temperature can be maintained, the temperature controller normally operates in the cooling operation.However, when the temperature controller starts the cooling operation, the temperature controller is stopped, the injection molding machine remains operating, and the medium path is stopped. If the medium is neatly drained and then the cooling water is flown, the temperature controller will not be used in the cooling operation unnecessarily. Since the mold medium path device can freely remove the medium from the medium path, the medium path can be set as a permanent medium path. . In addition, it is clear from the description of the specification that the effects of the present invention are not limited to these.

[Brief description of the drawings]

FIG. 1 is a block diagram of a mold medium path device.

FIG. 2 is a block diagram of a mold medium path device showing a state connected to a mold temperature controller.

FIG. 3 is a block diagram according to another embodiment of a mold medium path device in a state where it is connected to a mold temperature controller.

FIG. 4 is a block diagram according to another embodiment of a mold medium path device.

FIG. 5 is a diagram illustrating a method of discharging a medium remaining in a pocket when a mold medium path has a pocket.

FIG. 6 is a view showing a case where there are a plurality of in-mold medium paths according to another embodiment of the mold medium path apparatus.

[Explanation of symbols]

 Reference Signs List A block for medium transfer B block for medium return C medium transfer path D medium return path 1 medium transfer port 2 medium inlet 3 medium discharge port 4 return medium port 5 medium outlet 6 medium discharge port 7 mold 7a medium path in mold 7b Mold media inlet 7c Mold media outlet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 33/04 B29C 45/73 B29C 45/78

Claims (10)

(57) [Claims] 1. A mold medium path apparatus in which a medium is supplied to a medium path 7a provided in a mold 7 to adjust the temperature of the mold 7, the apparatus includes a medium feeding port 1, at least one medium feeding port. A medium feeding block A in which the medium inlet 2 and the medium outlet 3 are in fluid communication with each other, and a return medium in which the medium returning port 4, at least one or more medium outlets 5 and the medium outlet 6 are in fluid communication with each other. A medium block B, a medium supply path C that fluidly connects the medium supply port 1 and the mold medium inlet 7b, a return medium port 4 and a mold medium outlet 7
c. and a return medium path D for fluidly connecting the medium path c and at least one of the medium inlet 2 and the medium outlet 5 to a suitably selected medium source. 2. A mold medium path apparatus in which a medium is supplied to a medium path 7a provided in the mold 7 to adjust the temperature of the mold 7, the apparatus comprises a medium feed port 1, at least two A medium sending block A in which the above medium inlets 2a and 2b are in fluid communication with each other, a medium returning port 4, and at least two or more medium outlets 5;
a, 5b in fluid communication with each other
A fluid path C that fluidly connects the medium port 1 and the mold medium inlet 7b, and a medium path D that fluidly connects the medium return port 4 and the mold medium outlet 7c. Connecting at least one medium inlet and medium outlet to a heating medium source, connecting at least one medium inlet and medium outlet to a cooling medium source, and transferring a medium selected by opening and closing a valve to a mold medium path 7a. A mold medium path device, characterized in that it is supplied. 3. The apparatus according to claim 1, wherein at least one of the medium inlet and the medium outlet is provided with at least one of the medium inlet and the medium outlet, and at least one of the medium inlet and the medium outlet is connected to the cooling medium. 2. The mold medium path device according to claim 1, wherein the medium is connected to a source, and the medium selected by opening and closing the valve is supplied to the mold medium path 7a. 4. The medium sending block A and the medium returning block B.
3. The mold medium path device according to claim 2, wherein the medium outlets 3 and 6 are provided respectively. 5. A block A for transmitting a medium and a block B for returning a medium.
The mold medium path device according to any one of claims 1 to 4, wherein each of said mold medium paths is constituted by a manifold. 6. The medium sending block A and the medium returning block B.
At least one of the compressed air intakes 9, 10
The mold medium path device according to any one of claims 1 to 5, further comprising: 7. The mold medium path device according to claim 1, wherein each of the ports is selectively opened and closed by a valve provided in each of the ports. 8. The apparatus according to claim 1, wherein said ports are communicated via a switching valve provided in a block, and are selectively opened and closed by said switching valve. Mold media path device. 9. The mold medium path device according to claim 1, wherein said medium supply path C and said medium return path D are permanently provided on the mold side. 10. A flow direction of a medium in a medium flow path including a medium path 7a, a medium transfer block A, a medium block B, a medium transfer path C, and a return path D provided in a mold 7 can be reversed. The mold medium path device according to any one of claims 1 to 9, wherein: