JP2005046846A - Method and device for cooling die and the like in die casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the cooling effect to a die etc., in die casting. <P>SOLUTION: The cooling method for die etc., in the die casting comprises storing a prescribed amount of cooling water in cooling water piping 6 communicatably connected with a cooling device 14 separately arranged with cooling water paths 4, 5 and the die 1, to the cooling water paths 4, 5 provided in the die 1, and supplying the cooling water with high pressure together with pressurized air at preset timing when molten metal is cast into the die 1 to cool prescribed cooling portions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to cooling of a die casting mold and the like, and more particularly, to a cooling method and apparatus for a core disposed in a die casting mold.
[0002]
[Prior art]
In general, cooling of die-casting dies, etc., prevents the cast molten metal from welding to the dies and cores (core pins), smoothing the mold release action, and improving product quality When cooling with cooling water supplied at the normal water pressure (tap water pressure), cooling water supplied to, for example, a thin core pin (core pin) or a high-temperature part is essential. The phenomenon of boiling in the cooling path (hole) and flowing back to the supply source occurs. In order to prevent this phenomenon, it is sufficient to supply high-pressure cooling water. In that case, however, the cooling device is overcooled, and various adverse effects are caused. In addition, the cooling device becomes complicated and large, and the equipment cost increases. Was.
As a means for cooling by combining cooling water and high-pressure air, for example, a means has been devised for cooling by continuously supplying cooling water and high-pressure air to the cooling water passage alternately during the cooling (for example, , See Patent Document 1).
Similarly, a means for alternately pumping cooling water and high-pressure air from a pumping unit of a mold cooling device has been devised (for example, see Patent Document 2).
Also, a means has been devised in which the cooling water remaining in the cooling water passage is drained with high-pressure air after flowing the cooling water through the cooling water passage for a predetermined time (see, for example, Patent Document 3). .
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-52161 (2nd page, FIG. 1)
[Patent Document 2]
JP2002-172455 (5th page, FIG. 2)
[Patent Document 3]
Japanese Patent Laid-Open No. 11-57977 (second page, FIG. 2)
[0004]
[Problems to be solved by the invention]
However, the means for alternately feeding the cooling water and the high-pressure air requires a built-in high-pressure pump to send the cooling water itself to the cooling part at a high pressure, and the cooling device is complicated, large and expensive. There was a problem of becoming a thing. Further, even in the means for draining the cooling water remaining in the cooling water passage with high-pressure air, the air does not act directly on the cooling water (liquid) during actual cooling, and the above-mentioned problem is solved. It did not lead to.
Therefore, in view of the above-described conventional problems, the object of the present invention is to improve the cooling effect on a die-casting die and the like, and to cool the die-casting die and the like that can be made cheaper, simpler and smaller, and To provide an apparatus.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is a cooling method for a die-casting die or the like, wherein the cooling water channel and the die are provided separately from the cooling water channel provided in the mold. A predetermined amount of cooling water is stored in a cooling water pipe that is connected to the cooling device of the machine so that the cooling water can be communicated, and this cooling water is supplied with high pressure together with pressurized air at a preset timing when casting into the mold. The gist is that the predetermined cooling part is cooled.
[0006]
According to this configuration, at the time of cooling after the start of casting into the mold, a predetermined amount of cooling water is stored in the cooling water conduit communicated with the cooling water channel, and the cooling water is pressurized air. Effectively applying a pressure and supplying cooling water to which the pressure (pressure higher than the water pressure of the cooling water supply source) is applied to a predetermined cooling part at a preset timing makes the cooling part effective. Can be cooled. This prevents the cast molten metal from being welded to the mold, smoothing the mold release action, and improving the quality of the product.
[0007]
The invention according to claim 2 is a cooling method for a die-casting die or the like, wherein the cooling water channel and the mold are provided separately from the cooling water channel of the core disposed in the metal mold. A predetermined amount of cooling water is stored in a cooling water pipe that is connected to the cooling device so as to communicate with the cooling device, and this cooling water is supplied at high pressure together with pressurized air at a preset timing when casting into the mold. The gist is that the core is cooled.
[0008]
According to this configuration, similarly to the first aspect, the pressure by the pressurized air is positively applied, and the cooling water to which the pressure (pressure higher than the water pressure of the cooling water supply source) is applied is set in advance. The core can be effectively cooled by supplying it to the cooling water channel of the core at the same timing. This prevents the cast molten metal from being welded to the core, smoothing the mold releasing action of the core, and improving the quality of the product.
[0009]
The invention according to claim 3 is a cooling device such as a die-casting die, and is connected to a cooling water pipe connected to be able to communicate with a cooling water passage provided in the die, and a cooling water supply source. And a cooling water supply passage for supplying cooling water to the cooling water conduit, and a pressurized air supply passage connected to a pressurized air supply source and supplying pressurized air to the cooling water conduit, and into the mold The gist of the present invention is that a predetermined amount of cooling water in the cooling water conduit is supplied into the cooling water passage with high pressure at a preset timing at the time of casting.
[0010]
According to this configuration, as a cooling device, a predetermined amount of cooling water is stored in the cooling water conduit communicated with the cooling water channel during cooling after the start of casting into the mold, and the cooling water is By positively applying pressure by pressurized air and supplying cooling water to which the pressure (pressure higher than the water pressure of the cooling water supply source) is applied to a predetermined cooling part at a preset timing, The cooling part can be effectively cooled.
This prevents the cast molten metal from being welded to the mold, smoothing the mold release action, and improving the quality of the product.
[0011]
Furthermore, the invention according to claim 4 is a cooling device such as a die-casting die, a cooling water pipe connected to be able to communicate with a cooling water channel of a core disposed in the die, and a cooling water supply A cooling water supply path that is connected to a source and supplies cooling water to the cooling water pipe; and a pressurized air supply path that is connected to a pressurized air supply source and supplies pressurized air to the cooling water pipe; A gist of the present invention is that a predetermined amount of cooling water in the cooling water conduit is supplied into the cooling water channel with high pressure at a preset timing when casting into the mold.
[0012]
According to the invention of claim 4, as in the case of claim 3, as the cooling device, the pressure by the pressurized air is positively applied, and the pressure (pressure higher than the water pressure of the cooling water supply source) is applied. By supplying the cooled water to the core cooling path at a preset timing, the core can be effectively cooled. This prevents the cast molten metal from being welded to the core, smoothing the mold releasing action of the core, and improving the quality of the product.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, as shown in FIG. 1, the case where the core pin 2 disposed in the die casting mold 1 is cooled will be described. The core pin 2 is disposed facing the mold of the die casting mold 1. The core pin 2 has a cooling pipe 3 integrally connected to a rear end portion thereof by screwing means or the like.
[0014]
Inside the core pin 2 and the cooling pipe 3, a cooling path 4 is formed in the axial direction so that the cooling water circulates to the tip of the core pin 2, and the cooling path 4 The guide path 5 for guiding the cooling water to the tip end side of the core pin 2 is partitioned in the axial direction. The cooling water channel referred to in the present invention is mainly composed of the cooling channel 4 and the guide channel 5 in the cooling pipe 3.
[0015]
A connection port 7 to which a cooling water pipe 6 to be described later is connected is formed on the inlet side of the guide path 5, and the entire outlet on the outlet side of the cooling path 4 is connected to a drain pipe 9 on the drain tank 8 or the like side. An outlet-side connection port 10 is formed.
[0016]
The cooling water pipe 6 formed to have a predetermined length is connected so that one side can communicate with the inlet side of the guide path 5 in the cooling pipe 3 and the other side is connected to the cooling water supply path 11 and the pressurized air supply path 12. It is connected so that it can communicate with the confluence | merging part 13 of this. The cooling water supply path 11 and the pressurized air supply path 12 are mainly used to constitute a cooling device 14 that is provided separately from the mold 1 referred to in the present invention. Therefore, the cooling water pipe 6 is a cooling water path for the core pin 2. And the cooling device 14 are connected to be able to communicate with each other.
[0017]
The cooling water supply path 11 is connected to a faucet or the like using, for example, a general water supply as a cooling water supply source, and the supply path 11 allows communication from the cooling water supply source to the cooling water pipe 6. A solenoid valve 15 that can be switched between a position to perform communication and a position to cut off the communication is incorporated. Between the solenoid valve 15 and the cooling water pipe 6, a backflow of cooling water to the solenoid valve 15 side and a later-described A check valve 16 for preventing the flow of pressurized air is incorporated.
[0018]
The pressurized air supply path 12 connected to the pressurized air supply source is connected to the connection site between the cooling water supply channel 11 and the cooling water pipe 6 so as to communicate therewith. Regulator 17, pressure gauge 20, solenoid valve 18 that can be switched from a supply source of pressurized air to a position that allows communication of cooling water pipe 6 and a position that blocks the communication, pressurization to the solenoid valve 18 side A check valve 19 for preventing the back flow of air and the flow of cooling water from the cooling water supply path 11 is incorporated.
[0019]
In FIG. 1, broken lines branched from the cooling water supply path 11 and the pressurized air supply path 12 are configured in the same manner as described above in order to correspond to a large number of core pins 2 arranged in the mold 1. The cooling water supply path 11a and the pressurized air supply path 12a are respectively shown.
[0020]
Then, the cooling method is demonstrated with the effect | action of the cooling device in embodiment mentioned above.
[0021]
When casting into the mold 1, first, the electromagnetic valve 15 is switched from a cooling water supply source to a position that allows communication with the cooling water pipe 6, and a predetermined amount of cooling water is stored in the cooling water pipe 6. To do. After storing a predetermined amount of cooling water, the solenoid valve 15 is switched to a position where the communication is cut off.
[0022]
In this state, the solenoid valve 18 of the pressurized air supply path 12 is switched to a position where the communication of the cooling water pipe 6 is cut off from the pressurized air supply source. The supply of pressurized air is shut off.
[0023]
Therefore, casting into the mold 1 is started, and a predetermined timing after the casting, for example, the temperature of the core pin 2 is appropriately detected by detecting means (not shown), and the temperature of the core pin 2 is detected. When the solenoid valve 18 of the pressurized air supply path 12 is switched from the pressurized air supply source to a position that allows communication of the cooling water pipe 6 in accordance with a command from the detection means, Pressurized air having a predetermined pressure is supplied to the cooling water stored in a predetermined amount in the cooling water pipe 6 described above. The predetermined pressure of the pressurized air is higher than the water pressure of the tap water, for example, depending on various conditions such as a mold corresponding to the product to be obtained, but is preferably set to about 0.4 to 0.7 MPa.
[0024]
By the action of the supplied pressurized air, the cooling water is higher than the pressure (water pressure) of the supply source, together with the pressurized air, from the cooling pipe 3 and the guide path 5 in the core pin 2 through the cooling water pipe 6. It is supplied to the cooling path 4 and then reaches the drainage tank 8 via the drainage pipe 9.
[0025]
As a result, the core pin 2 is effectively and optimally cooled by the cooling water having a pressure higher than the water pressure of the supply source supplied from the cooling pipe 3 to the cooling path 4 inside. Become.
[0026]
Then, with the end of the casting operation, the electromagnetic valve 18 of the pressurized air supply path 12 is switched to a position where the communication of the cooling water pipe 6 is cut off from the pressurized air supply source, and the electromagnetic valve 15 of the cooling water supply path 11 is switched. The cooling water supply source is switched again to a position that allows communication with the cooling water pipe 6, a predetermined amount of cooling water is stored in the cooling water pipe 6, and the core pin 2 is cooled in the next casting operation. It corresponds to.
[0027]
As described above, the core pin 2 is effectively and optimally cooled by the high-pressure cooling water supplied together with the pressurized air having a predetermined pressure as described above. The metal is prevented from being welded to the core pin 2 so that the releasing action of the core pin 2 is smoothed, and the quality of the product is improved.
[0028]
In the above-described embodiment, the cooling of the core pin 2 has been described. However, the same can be applied to the case of cooling the die casting die 1.
[0029]
Further, in the present embodiment, since the cooling device 14 is small, there is an upper limit to the flow rate of cooling water for one casting, but a long and thick cooling water pipe 6 is used or cooling is performed. It is possible to secure a necessary amount of cooling water by increasing the thickness of the cooling water supply pipe 11 that connects the water supply source and the cooling device 14, and when the number of core pins 2 to be cooled is large. It is also possible to secure a flow rate by using a plurality of cooling devices 14 at the same time.
[0030]
In the above-described embodiment, the timing of supplying the cooling water from the cooling water pipe 6 to the cooling pipe 3, that is, the pressurized air supply timing is set by the temperature of the core pin 2 at the time of casting. However, it may be set by other means, for example, the time from the start of casting. And, the timing of supplying the cooling water was set to a state in which the temperature of the core pin 2 reached about 200 ° C. At this set temperature, the type, amount, temperature, amount of release agent of the molten metal, It varies depending on conditions such as the number and position of the cooling pipes 3.
[0031]
Furthermore, the cooling water supply path 11 and the pressurized air supply path 12 can be variously modified without departing from the gist of the present invention.
[0032]
【The invention's effect】
In invention of Claim 1 and 2, the said cooling site | part (the said core) can be cooled effectively.
This prevents the cast molten metal from welding to the mold, smoothing the mold release action, improving the quality of the product, and eliminating the need for a built-in pump, making the cooling device more complex and larger The increase in the equipment cost can be eliminated as much as possible.
[0033]
In the third and fourth aspects of the invention, the cooling part (the core) can be effectively cooled as the cooling device, similarly to the first and second aspects.
This prevents the cast molten metal from being welded to the mold, facilitating the release action, improving the quality of the product, eliminating the need for a built-in pump, making the cooling device itself more complex and large And increase in equipment cost can be eliminated as much as possible.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a core and a cooling pipe (cooling water channel).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Die-casting die 2 Core pin 3 Cooling pipe 5 Guide path 6 Cooling water pipe 11 Cooling water supply path 12 Pressurized air supply path 14 Cooling device

Claims (4)

A cooling method for die-casting molds, etc., wherein a predetermined amount is provided in a cooling water conduit that connects the cooling water channel and a cooling device that is separate from the die to the cooling water channel provided in the mold. The die-casting die is characterized in that the cooling water is stored and the cooling water is supplied with high pressure at a preset timing when casting into the mold at a high pressure to cool a predetermined cooling portion. Cooling method for molds. A cooling method for a die-casting die or the like, wherein a cooling water pipe is connected to a cooling water channel of a core disposed in the die so that the cooling water channel and a cooling device provided separately from the die can communicate with each other A predetermined amount of cooling water is stored in the passage, and the cooling water is supplied at a preset timing when casting into the mold with high pressure to cool the core. Cooling method for die casting molds. A cooling device such as a die-casting die, which is connected to a cooling water passage provided in the die so as to communicate with the cooling water passage, and is connected to a cooling water supply source and supplies the cooling water to the cooling water passage. A cooling water supply path and a pressurized air supply path that is connected to a pressurized air supply source and supplies pressurized air to the cooling water pipe line are pressurized at a preset timing when casting into the mold. A cooling device such as a die-casting die, which is configured to supply a predetermined amount of cooling water in the cooling water pipe along with air into the cooling water channel at a high pressure. A cooling device such as a die-casting die, which is connected to a cooling water channel of a core arranged in the die so as to be able to communicate with the cooling water channel, connected to a cooling water supply source and cooled to the cooling water channel A cooling water supply path for supplying water and a pressurized air supply path connected to a pressurized air supply source and supplying pressurized air to the cooling water pipe line are preset when casting into the mold. A cooling device such as a die-casting die, which is configured to supply a predetermined amount of cooling water in the cooling water pipe along with pressurized air at a high pressure into the cooling water channel at a timing.

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