JPH11188473A - Die cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die cooling device which surely carries out mixing of a compressed air and a liquid coolant without difficulty of regulation of a pressure regulating valve and surely supplies the liquid coolant to a cooling pipe even in a little amount. SOLUTION: The air from a compressed air source 19 is supplied to a cooling pipe 5 via a tube 17, a first selector valve 8, an air supply tube 16a, and an outer tube of a double tube 50. The cooling water from a water tank 15 is supplied to the pipe 5 via a tube 16c, a flow volume control valve 13, a liquid coolant supply tube 16b, and an inner tube of the double tube 50 by the action of the pressure from the source 19 regulated by a pressure regulating valve 12. Inside the pipe 5, the liquid coolant is mixed with the air and ejected in a mist form from an ejection nozzle 5a so as to cool a die 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold cooling device, and more particularly to a mold cooling device capable of introducing a sufficient cooling liquid into a cooling hole having a small diameter.

[0002]

2. Description of the Related Art As a conventional mold cooling device, for example, there is one disclosed in Japanese Patent No. 2538376. This will be described with reference to FIG.

[0003] A cavity 3 is defined on the divided surface of the molds 1 and 2, and a cooling hole 4 is formed in the mold 1 in the vicinity thereof. A cooling pipe 5 having a small diameter is inserted into the cooling hole 4, and one end of the cooling pipe 5 forms an injection port 5a. Drain pipe 6
And one end thereof faces the cooling hole 4 and the other end is connected to a drainage receiving portion (not shown). The cooling pipe 5 and the drain pipe 6 are fixed to a metal fitting 7 screwed and fixed to an inlet of the cooling hole 4.

[0004] The other end 5b of the cooling pipe 5 is provided with a cooling liquid (water).
And connected to the pipe 116 through which the compressed air passes,
6 is a first and second branch pipe 116 at a branch point 116d.
a and 116b. The first branch pipe 116a is connected to an output port of a first switching valve (electromagnetic valve) 8, and an input port of the first switching valve 8 is connected to a compressed air source 19 via a pipe 17. The first switching valve 8 has a solenoid 8a and a spring 8b, and the solenoid 8a is connected to a line 30a.
Is connected to the control unit 30 via the. The spring 8
b is provided for maintaining the first switching valve 8 at the valve closing position 8X, and disconnects the connection between the compressed air source 19 and the pipe 116. The solenoid 8a is provided to switch the first switching valve 8 to the valve opening position 8Y against the urging force of the spring 8b in response to a compressed air supply signal S1 from the control unit 30. The pipe 116 is in communication. As described above, the pipe 116, the first branch pipe 116a, the first switching valve 8, the pipe 17, the compressed air source 19, and the line 30a constitute a means for supplying compressed air to the cooling pipe 5.

Next, the coolant supply means will be described. The second branch pipe 116b is connected to the output port of a second switching valve (electromagnetic valve) 9 via a flow control valve 13, and the input port thereof is connected to a pipe 116c. Is connected to a sealed coolant tank 15 (hereinafter referred to as a water tank 15).
The second switching valve 9 has a solenoid 9a and a spring 9b, and the solenoid 9a is connected to the control unit 3 via a line 30b.
0 is connected. The spring 9b is connected to the second switching valve 9
Is maintained at the valve closing position 9X, and the connection between the water tank 15 and the pipe 116 is cut off. Further, the solenoid 9a opens the second switching valve 9 in the valve opening position 9 against the urging force of the spring 9b in response to the water supply signal S2 from the control unit 30.
It is provided for switching to Y, whereby the water tank 15 and the pipe 116 communicate. At this time, the second branch pipe 11
The amount of water flowing through 6b is controlled by the flow control valve 13.

The cooling liquid supply means further comprises a pressure regulating valve 12 for controlling the internal pressure of the water tank 15 and a third switching valve (electromagnetic valve) 10.
And That is, the pipe 17 a branches from the pipe 17 and is connected to the input port of the third switching valve 10 via the pressure adjusting valve 12. The output port of the third switching valve 10 is a pipe 17
b, it is connected to the space inside the water tank 15. The third switching valve 10 includes a solenoid 10a and a spring 10b.
And the solenoid 10a is connected to the control unit 30 via a line 30c. The spring 10b is the third
The switching valve 10 is provided to maintain the valve closing position 10X, and disconnects the connection between the water tank 15 and the compressed air source 19. The solenoid 10a is provided to switch the third switching valve 10 to the valve opening position 10Y against the urging force of the spring 10b in response to an air pressure signal S3 from the control unit 30. Source 19
Communicates with At this time, the air flowing through the pipe 17 a is subjected to pressure control by the pressure regulating valve 12, and the adjusted pressure acts on the water surface in the water tank 15 so that the water in the water tank 15 is removed from the pipe 1 a.
It is derived in 16 directions.

In this mold cooling device, a means for injecting water into the water tank 15 is further provided. That is, in the water tank 15, a lower limit detector 14a for detecting a lower limit water level in the water tank.
And an upper limit detector 14b for detecting an upper limit water level,
These detectors 14a and 14b are connected to the control unit 30 via lines 30e and 30f. Further, the input port of the switching valve (solenoid valve) 11 for water injection is connected to the water source 2 via the pipe 18a.
0, and the output port is connected to the water tank 15 via the pipe 18b. The switching valve 11 for water injection has a solenoid 11a and a spring 11b.
a is connected to the control unit 30 via a line 30d. The spring 11b is provided to maintain the water injection switching valve 11 at the valve closing position 11X, and cuts off the connection between the water tank 15 and the water source 20. Also, the solenoid 11a
Is the spring 1 by the water injection signal S4 from the control unit 30.
The switching valve 11 for water injection is opened to the valve opening position 11 against the biasing force of 1b.
It is provided for switching to Y, whereby the water tank 15 and the water source 20 communicate. The water injection signal S4 is issued in response to a detection signal indicating that the lower limit detector 14a has detected the lower limit water level.

Next, the operation will be described. First, the first, second and third switching valves 8, 9 and 10 are in the valve closing positions 8X, 9X and 10X, respectively.
Is in a state where the connection with the compressed air source 19 and the water tank 15 is cut off. At this time, the inside of the water tank 15 is opened to the atmosphere via the pipe 17b and the third switching valve 10. From this state, the control unit 30 sends the solenoid 10a of the third switching valve 10
When the pneumatic action signal S3 is output to the third switching valve 10
Is switched to the valve opening position 10Y, and the compressed air source 19 is
Pipe 17, pipe 17a, pressure regulating valve 12, third switching valve 10,
The water tank 1 is connected to the water tank 15 through a pipe 17b.
The water surface in 5 is pressurized.

After a predetermined time has elapsed, the control unit 30 simultaneously outputs the compressed air supply signal S1 and the water supply signal S2 to the solenoids 8a, 9a of the first and second switching valves 8, 9, respectively.
The first and second switching valves 8 and 9 are opened at positions 8Y and 9Y, respectively.
Is switched to. Therefore, the water tank 15 is
c, second switching valve 9, flow control valve 13, second branch pipe 116
b, connected to the cooling pipe 5 via the pipe 116; At the same time, the compressed air source 19 is connected to the cooling pipe 5 via the pipe 17, the first switching valve 8, the first branch pipe 116a, and the pipe 116. Therefore, the cooling liquid whose water amount has been adjusted by the flow control valve 13 and the pressure adjusting valve 12 is injected from the injection port 5a to the bottom of the cooling hole 5 together with the compressed air. Then, the water that has not been vaporized is discharged from the cooling hole 4 through the drain pipe 6.

When the output of the compressed air supply signal S1 and the water supply signal S2 is stopped after a certain period of time, the spring 8
The first and second switching valves 8, 9 are returned to the valve closing positions 8X, 9X by the biasing forces b, 9b. Therefore, the supply of water and air to the cooling pipe 5 is stopped. Next, the output of the pneumatic signal S3 from the control unit 30 is stopped, and the third switching valve 1
By returning 0 to the valve closing position 10X by the urging force of the spring 10b, the water tank 15 is shut off from the compressed air source 19, and the action of the air pressure on the water surface in the water tank 15 is stopped.

The lower limit water level in the water tank 15 is the lower limit detector 1
4a, the lower limit water level signal is output to the controller 30 via the line 30e. In response to this signal, the water injection signal S4 is output to the solenoid 11a of the water injection switching valve 11, and as a result, the water injection switching valve 11 at the valve closing position 11X is switched to the open position 11Y, and the water source 20 Is supplied to the water tank 15 via the pipe 18a, the water supply switching valve 11, and the pipe 18b. When the supplied water reaches the upper limit water level, the upper limit detector 14b detects that fact and outputs an upper limit water level signal to the controller 30 via the line 30f. In response to this signal, the output of the water injection signal S4 from the control unit 30 is stopped, and as a result, the water injection switching valve 11
1b is returned to the valve closing position 11X by the urging force of the water source 20b.
And the connection with the water tank 15 is disconnected. The control unit 30
Is configured to prevent the output of the water injection signal S4 while the pneumatic action signal S3 is being output to the third switching valve 10. When the third switching valve 10 is open, the water supply switching valve 11
Is opened, the switching valve 11 for water injection is actuated by compressed air pressure.
This is because compressed air flows into the water tank 15 and a predetermined air pressure on the water surface in the water tank 15 cannot work.

According to the mold cooling apparatus disclosed in Japanese Patent No. 2538376, since the cooling liquid itself is conveyed by air pressure, it is not necessary to consider the relationship between the cross-sectional areas of the cooling pipe and the cooling liquid supply pipe. The cooling pipe with a small diameter can be cooled by the cooling pipe.

Further, since the cooling liquid and the air are conveyed by the pressure from the same compressed air source, the air pressure and the water pressure are substantially the same, and there is no need to individually adjust the pressure.

Further, the first to third switching valves are controlled at appropriate timing, and the flow rate of the coolant and the pressure of the compressed air to the coolant tank are optimally adjusted by the flow control valve and the pressure regulating valve. It is possible to precisely control the mold temperature, and it is possible to stably produce a molded product having no variation in quality. Furthermore, by releasing the inside of the coolant tank to the atmosphere, the coolant can be smoothly supplied to the coolant tank.

[0015]

However, the mold cooling device described in the above publication has a drawback that if the flow control valve 13 is excessively throttled, a desired amount of cooling liquid cannot be supplied to the mold 2 smoothly. Was done. That is, if the flow control valve 13 is excessively throttled, there is a problem that the pressure on the discharge side of the flow control valve 13 becomes extremely low. Therefore, fine adjustment of the pressure adjustment valve 12 must be performed, but this involves difficulty. In particular, when cooling inside a fine pin such as a cast pin, the injection port 5a
When the internal pressure of the cooling pipe 5 rises, the internal pressure also acts inside the pipe 116, and
Also increase the internal pressure. Due to this effect, the flow control valve 1
3 becomes lower than the pressure at the branch point 116d, and as a result, the cooling liquid flows from the second branch pipe 116b to the pipe 116d.
Not only is no longer delivered to the second branch pipe 116b, but also the coolant flows backward in the second
Air will also flow into 16b. Therefore, there is a problem that water and air cannot be mixed only by adjusting the flow control valve 13 and the pressure control valve 12.

It is also possible to extend the branch pipes 116a and 116b to the vicinity of the mold and to carry the coolant and the air by two pipes. In this case, however, the number of pipes increases.
In the vicinity of a narrow mold, not only is it very disturbing, but the connection is troublesome.

Accordingly, the present invention provides a mold for reliably mixing compressed air and a cooling liquid without difficulty in adjusting a pressure regulating valve, and for reliably sending a small amount of cooling liquid to a cooling pipe. It is an object to provide a cooling device.

In the conventional mold cooling method, the temperature of the mold is adjusted only by controlling the timing of starting and stopping the ejection of the cooling liquid. Therefore, when cooling a mold having a small heat capacity, such as a cast pin, even if the cooling liquid is not ejected, heat is taken from the mold by vaporization of the remaining cooling liquid, resulting in overcooling. I was

It is another object of the present invention to provide a mold cooling method which can prevent such supercooling.

[0020]

In order to achieve the above object, the present invention provides a compressed air source, a cooling liquid supply source provided separately from the compressed air source, and a compressed air source. An air supply pipe 16a that is connected and supplies air, a cooling liquid supply pipe 16b that supplies a cooling liquid of the cooling liquid supply source 15 by the action of the pressure of the compressed air source 19, and is provided in the molds 1 and 2. , The air supply pipe 16a and the coolant supply pipe 16b
Injection unit 5 for discharging a mixture of the cooling liquid and the air in communication with the
In the mold cooling device including: a double pipe 50 having an outer pipe 50a and an inner pipe 50b is provided between the injection unit 5 and the air supply pipe 16a and the coolant supply pipe 16b;
The air supply pipe 16a is connected to either the outer pipe 50a or the inner pipe 50b, and the coolant supply pipe 16b provides a mold cooling device connected to the other.

According to the present invention, one end 5a of a cooling pipe 5 is inserted into a cooling hole 4 formed in a mold 2, and the inserted one end 5a forms an injection port for injecting a cooling liquid. The other end 5b of the pipe 5 is connected to one end of a pipe, and the other end of the pipe is connected to an air supply pipe 16a connected to a compressed air supply means and a coolant connected to a coolant supply means. Supply pipe 1
6b, the compressed air supply means is provided with a first switching valve 8 and a compressed air source 19, and when the first switching valve 8 is opened, the compressed air from the compressed air source 19 is supplied to the cooling pipe. 5, the coolant supply means includes a flow control valve 13, a second switching valve 9, a closed coolant tank 15 connected to the second switching valve 9, Compressed air source 19
Pressure regulating valve 1 provided between the
2 and a third switching valve 10 that can be opened to the atmosphere. The flow rate of the coolant is adjusted by the flow rate control valve 13 and the coolant level of the coolant tank 15 is adjusted by the pressure adjustment valve 12. The pressure of the compressed air to be actuated is formed so as to be adjustable, and the compressed air whose pressure is adjusted by the opening operation of the third switching valve 10 is caused to act on the coolant surface. In the mold cooling apparatus for supplying the cooling liquid whose water volume has been adjusted by the opening operation of the second switching valve 9 to the cooling pipe 5, the pipe connected to the other end 5b of the cooling pipe 5 is an outer pipe 50a. The outer pipe 50a and one end of the inner pipe 50b communicate with the cooling pipe 5, and the air supply pipe 16a is connected to the outer pipe 5a.
0a or the other end of the inner pipe 50b, and the coolant supply pipe 16b provides a mold cooling device connected to the other.

In order to prevent overcooling of the mold, a mold cooling method of injecting a coolant and air into the molds 1 and 2 and adjusting the temperature of the mold by utilizing heat of vaporization of the coolant is provided. There is provided a mold cooling method in which after cooling a mold by injecting a cooling liquid, only air is finally ejected to remove a residual cooling liquid.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mold cooling apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
In these drawings, the same reference numerals as those in FIG. 3 indicate the same members and devices, and a description thereof will be omitted. The main difference from the configuration of FIG. 3 is that the pipe connected to the end of the cooling pipe 5 is constituted by a double pipe 50 having an inner pipe 50b and an outer pipe 50a. One end communicates with the cooling pipe 5, the air supply pipe 16a is connected to the other end of the outer pipe 50a, and the coolant supply pipe 16b is connected to the other end of the inner pipe 50b. Is a point where air and water are not merged at a portion corresponding to the branch point 116d. That is, in the conventional apparatus shown in FIG. 3, the pipe 116 is not constituted by a double pipe, and the branch point 116d
In the mold cooling apparatus according to the present embodiment, a double pipe 50 for separately transporting the coolant and the air is installed in a portion corresponding to the pipe 116 of the related art, and the cooling is performed. The liquid and the air are configured to be mixed at the end 5b of the cooling pipe.

FIG. 2 shows a main part of a mold cooling device used in the embodiment of the present invention.
Are drilled. A cooling pipe 5 having a small diameter is inserted into the cooling hole 4, and an injection needle 5c is attached to a tip of the cooling pipe 5. The tip of the injection needle 5c constitutes an injection port 5a for jetting a mixture of a cooling liquid and air. A drain pipe 6 is fitted in the cooling hole 4 so as to match the inner diameter of the cooling hole 4 and concentrically with the cooling pipe 5, and the air and water in the cooling hole are taken in from the tip of the drain pipe 6. And is discharged from the other end (not shown).

The rear end 5b of the cooling pipe 5 is located outside the mold 1, and is connected to the front end (one end) of the double pipe 50 via a joint 41. Here, the double pipe 50 has a concentric structure composed of an outer pipe 50a and an inner pipe 50b, and the front end of the outer pipe 50a and the inner pipe 50b opens to the joint 41 and communicates with the rear end of the cooling pipe 5. ing.

The rear end (the other end) of the double pipe 50 is connected to the air supply pipe 16a and the coolant supply pipe 16 through a joint 40.
b. Specifically, the joint 40 has an insertion hole 40a communicating with the other end of the outer tube 50a and the inner tube 50b.
An insertion hole 40b communicating with the other end of the cooling liquid supply pipe 16b is formed in the insertion hole 40a.
Are connected to the insertion hole 40b. The air supply pipe 16a and the coolant supply pipe 16b correspond to the first branch pipe 116a and the second branch pipe 116b shown in FIG. 3, respectively.
The compressed air source 19 communicates with the outer tube 50a of the double tube 50, and the water tank 15 communicates with the inner tube 50b of the double tube 50.

In the above configuration, the air from the compressed air source 19 is supplied to the pipe 17, the first switching valve 8, the air supply pipe 16a,
The water is supplied to the cooling pipe 5 through the insertion hole 40 a of the joint 40, the outer pipe 50 a, and the joint 41,
From the pipe 16c, the second switching valve 9, the flow control valve 1
3. Coolant supply pipe 16b, insertion port 40 of joint 40
b, cooling pipe 5 via inner pipe 50b and joint 41
Supplied to That is, the air and the cooling liquid are not mixed in the double pipe 50, and the air and the cooling liquid
In 1, it is discharged substantially parallel to the axial direction of the cooling pipe 5. That is, the cooling liquid is always injected into the cooling pipe 5. Then, in the cooling pipe 5, the cooling liquid is mixed with air and injected in a mist form from the injection port 5a to cool the mold 1. Then, the mixture of the cooling liquid and the air passes through the drain pipe 6 and the cooling hole 4.
Is discharged from

According to the mold cooling device according to the above-described embodiment, the air supply pipe 16a is connected to the outer pipe 50a, the coolant supply pipe 16b is connected to the inner pipe 50b, Since the coolant flows through different paths,
The cooling liquid can be supplied to the cooling pipe 5 regardless of the pressure difference between the air supply pipe 16a and the cooling liquid supply pipe 16b. When the cooling liquid and air are introduced into the cooling pipe 5, the pressure inside the cooling pipe 5 increases, but since the injection port 5a is open to the atmosphere through the cooling hole 4 and the drain pipe 6, the cooling pipe 5 The air and coolant in the lower pressure,
That is, it is guided toward the injection port 5a. Therefore, when the supply amount of the cooling liquid is small, that is, the cooling liquid supply pipe 16b and the pipe 16
Even when the internal pressure of the inner pipe 50b connected to the inner pipe 50b is low, air or the like does not flow backward through the cooling pipe 5 and enters the inner pipe 50b, so that the backflow of the cooling liquid can be prevented.

Further, air is introduced into the outer tube 50a of the double tube 50, and cooling fluid is introduced into the inner tube 50b, and both flow in the same direction. At the end 5b, the cooling liquid can be conveyed in the direction of the cooling pipe 5 by the urging force of the air flow.

The mold cooling device according to the present invention is not limited to the above embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the cooling liquid is not limited to water but may be oil or the like.

In this embodiment, the flow rate is controlled by the flow control valve 13 and the pressure control valve 12, but the water flow is controlled by keeping the pressure of the pressure control valve 12 constant and adjusting the flow control valve 13. It is also possible to adjust the pressure regulating valve 12 while keeping the flow control valve 13 constant.

Further, an insertion hole 40a connected to the outer tube 50a is provided.
The air supply pipe 16a is connected to the inner pipe 50b, and the coolant supply pipe 16b is connected to the inner pipe 50b.
a may be connected to the coolant supply pipe 16b, and 40b may be connected to the air supply pipe 16a. However, by supplying the coolant through the inner pipe 50b as in the present embodiment, the flow of air from the outer pipe 50a at the cooling pipe end 5b is reduced.
It is possible to scoop out the cooling liquid flowing out from 0b from the surroundings and to convey the cooling liquid to the cooling pipe 5 without delay.

Further, in the present embodiment, the injection port 5a is formed by attaching the injection needle 5c to the tip of the cooling pipe as shown in FIG. The injection needle 5c need not be attached.

In the above embodiment, the coolant and the air are mixed and injected at the same time. However, the coolant and the air can be injected separately with a time difference. In this case, first, only the coolant is injected into the cooling holes 4 to cool the mold to a desired temperature. Next, the supply of the cooling liquid is stopped, and only the air is jetted to remove the cooling liquid remaining in the cooling holes 4. Such an operation is possible by adjusting the timing of transmitting and stopping the signals S1 to S4. According to this method, since the cooling liquid remaining in the cooling hole 4 is immediately removed after cooling the mold to a desired temperature, heat is not removed from the mold due to vaporization of the remaining cooling liquid. In this way, it is possible to prevent overcooling when cooling a mold having a small heat capacity such as a cast pin. Also, the temperature of the mold starts to decrease with the start of the injection of the cooling liquid, but the cooling liquid in the mold is removed immediately after the injection of the cooling liquid is stopped. Stops. By utilizing such a phenomenon, the mold can be immediately cooled when the mold is cooled to a desired temperature, so that the mold can be cooled to a desired temperature without strictly adjusting the pressure of the coolant supply. Cooling can be performed, and adjustment of mold cooling can be easily performed.

In the supercooling prevention method in which the cooling liquid and the air are separately injected at different times, the use of the double pipe 50 as shown in FIGS. Preferably, 50 is used. That is, the double pipe 50
The cooling pipe 5 is located in front of the cooling pipe 5 (downstream direction), so that when only the cooling liquid is injected, the cooling liquid injected into the cooling hole 4 communicates with the air supply pipe 16a.
0a can be prevented. If a double tube is used, a cooling method in which only the cooling liquid is injected and then the remaining cooling liquid is removed by air, and a cooling liquid is injected in a mist-like mixture with air to cool the mold, and then the remaining cooling is performed. The cooling method for removing the liquid by air can be selected according to the type of the mold and the shape of the product.

[0036]

According to the mold cooling device of the present invention, since the air supply pipe and the coolant supply pipe are connected to the double pipe, the mold supply apparatus is independent of the pressure difference between the air supply pipe and the coolant supply pipe. The mixture of cooling liquid and air is introduced into the cooling pipe without increasing the number of pipes that interfere in the vicinity of the narrow mold and without troublesome connection of the pipes. Can be supplied efficiently.

Further, since air is introduced into one of the inner tube and the outer tube of the double tube and the other flows in the same direction, even when the supply amount of the cooling liquid is very small, the cooling liquid can be cooled. At the pipe end, the cooling liquid can be conveyed in the direction of the cooling pipe by the urging force of the air flow. Further, since the coolant can be smoothly supplied to the cooling pipe without being hindered by the air supply pressure, the responsiveness of the control related to the supply of the coolant is improved, and the mold can be cooled very accurately.

According to the mold cooling method of the third aspect, the temperature of the mold starts decreasing when the injection of the cooling liquid is started, but the cooling liquid is removed immediately after the injection of the cooling liquid is stopped. Almost simultaneously with the stop, the temperature drop of the mold stops. By utilizing such a phenomenon, the mold can be immediately cooled when the mold is cooled to a desired temperature, so that the mold can be cooled to a desired temperature without strictly adjusting the pressure of the coolant supply. Cooling can be performed, and adjustment of mold cooling can be easily performed. By this effect, even when cooling a mold having a small heat capacity such as a cast pin or the like, the influence of the heat of vaporization of the remaining coolant can be eliminated, and overcooling of the mold can be favorably prevented. Further, it is not always necessary to mix the cooling liquid and the air, and the cooling liquid and the air may be separately supplied at different times, so that a double pipe is not required and the piping equipment can be simplified. Since fine adjustment of the relative pressure between the cooling liquid and the air is not required, the operability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a mold cooling device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a double tube and its peripheral members used in the mold cooling device according to the embodiment of the present invention.

FIG. 3 is a schematic view showing a conventional mold cooling device.

[Explanation of symbols]

 2 Mold 4 Cooling Hole 5 Cooling Pipe 5a Injecting Port 5b Injecting Portion 5b Other End of Cooling Pipe 5 8 First Switching Valve 9 Second Switching Valve 10 Third Switching Valve 12 Pressure Control Valve 13 Flow Control Valve 15 Coolant Tank 16a Air supply pipe 16b Coolant supply pipe 19 Compressed air source 50 Double pipe 50a Outer pipe 50b Inner pipe

Claims (3)

[Claims] 1. A compressed air source, a coolant supply source provided separately from the compressed air source, an air supply pipe connected to the compressed air source to supply air, and a pressure action of the compressed air source. A cooling liquid supply pipe for supplying a cooling liquid from the cooling liquid supply source, and an injection for discharging a mixture of the cooling liquid and air provided in the mold and communicating with the air supply pipe and the cooling liquid supply pipe. A double pipe having an inner pipe and an outer pipe is provided between the injection section, the coolant supply pipe and the air supply pipe, and the air supply pipe is The mold cooling device is connected to one of the inner pipe and the outer pipe, and the coolant supply pipe is connected to the other pipe. 2. One end of a cooling pipe is inserted into a cooling hole formed in a mold, the inserted one end forms an injection port for injecting a cooling liquid, and the other end of the cooling pipe has a pipe. The other end of the pipe is connected to an air supply pipe connected to compressed air supply means and a cooling liquid supply pipe connected to cooling liquid supply means. The means is provided with a first switching valve and a compressed air source, and is configured to be able to supply compressed air from the compressed air source to the cooling pipe by opening the first switching valve. A flow control valve, a second switching valve,
A closed cooling liquid tank connected to the second switching valve, a pressure regulating valve provided between the compressed air source and the cooling liquid tank, and a third switching valve capable of releasing to atmosphere; The flow rate control valve is formed so that the flow rate of the coolant can be adjusted,
The pressure of the compressed air acting on the coolant surface of the coolant tank can be adjusted by the pressure adjusting valve, and the compressed air whose pressure has been adjusted on the coolant surface by the valve opening operation of the third switching valve. A cooling liquid whose flow rate has been adjusted by opening the first switching valve and the second switching valve after a lapse of a predetermined time to the cooling pipe, and connected to the other end of the cooling pipe. The formed pipe is constituted by a double pipe having an inner pipe and an outer pipe, one end of the inner pipe and the outer pipe communicates with a cooling pipe, and the air supply pipe is connected to the inner pipe or the outer pipe. The mold cooling device is connected to one of the ends, and the coolant supply pipe is connected to the other. 3. A mold cooling method in which a cooling liquid and air are injected into a mold and the temperature of the mold is adjusted by utilizing heat of vaporization of the cooling liquid. And finally, removing only the remaining coolant by injecting air only.