JP2005021979A - Cooling water circulating apparatus for metallic mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling water circulating apparatus for metallic mold with which clogging and constriction of a cooling water pipe line do not occur and the consumption of the cooling water can drastically be reduced. <P>SOLUTION: A water cooling device 20 for cooling the inside of the metallic mold 10 and a cooling device 30 for cooling high temperature water after cooling the metallic mold are connected through a relief valve 23 controlled according to a forming action, and a temperature adjusting device 40 for adjusting the temperature of the cooled cooling water is connected to the cooling device 30. Further, a water-treating device 50 for removing mineral component and scale, etc., contained in the cooling water is connected to the temperature adjusting device 40, and thus environmental load can be reduced by reducing the consumption of the cooling water at the formation with the metallic mold, and components for clogging and plugging the cooling water line for metallic mold 10 can be removed from the cooling water and the occurrence of a defective formed product can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mold cooling water circulation device for cooling the inside of a mold at the time of die casting or plastic molding.

Conventionally, cooling of the inside of a mold performed at the time of die casting or plastic molding is performed by introducing cooling water into a cooling water channel formed in the mold. Since the cooling water used for cooling the inside of the mold is not contaminated, it is generally drained as it is. Therefore, there is a problem that a large amount of cooling water is consumed for cooling the mold. Therefore, there is an attempt to reduce the environmental load by increasing the use efficiency of the cooling water by using the cooling water as a cooling medium sprayed on the mold surface as an aqueous release agent (for example, Patent Documents). 1). Further, since tap water used for cooling contains mineral components, there is a problem that these components adhere to the cooling water channel of the mold as scales and cause clogging or blockage of the cooling water channel.
JP 60-137541 A

  It is an object of the present invention to provide a mold cooling water circulation device that is free from clogging or constriction of a cooling water channel and that can greatly reduce the amount of cooling water used.

  In order to achieve the above-mentioned object, the present invention connects a water cooling device for cooling the inside of a mold and a cooling device for cooling high-temperature water after cooling the mold through a relief valve controlled in accordance with a molding operation. A mold cooling water circulation device in which a temperature adjusting device for adjusting the temperature of the cooled cooling water is connected to the cooling device, and a water treatment device for removing mineral components and scales contained in the cooling water is connected to the temperature adjusting device. The invention according to claim 1, and in the invention according to claim 1, the mold cooling water circulation device in which the high-pressure water supply mechanism and the low-pressure water supply mechanism that are switched according to the molding operation are connected to the water cooling device is the invention according to claim 2. In the invention of item 1 or 2, the mold cooling water circulation device in which the vacuum device is connected to the water cooling device is the invention of claim 3, and in the inventions of claims 1 to 3, the mold cooling in which the cooling device is provided with a water supply mechanism water The ring device is the invention according to claim 4, and in the invention according to claims 1 to 4, the mold cooling water circulation in which the water treatment device comprises one or multiple stages of filter chambers, activation chambers, mineral component removal chambers, and iron removal chambers. The device is the invention of claim 5.

  As is apparent from the above description, the present invention connects a water cooling device that cools the inside of the mold and a cooling device that cools the high-temperature water after cooling the mold through a relief valve controlled in accordance with the molding operation. By connecting a temperature adjusting device for adjusting the temperature of the cooled cooling water to the cooling device, and connecting a water treatment device for removing mineral components and scales contained in the cooling water to the temperature adjusting device, an enormous amount of cooling water is obtained. Since it can be reused without draining, the environmental load can be reduced, and the clogging and constriction of the cooling channel due to mineral components and scale can be prevented, resulting in molding defects due to variations in mold temperature. Therefore, productivity can be greatly improved and product cost can be reduced.

  Further, as described in claim 2, since the high-pressure water supply mechanism and the low-pressure water supply mechanism that are switched according to the molding operation are connected to the water cooling device, optimal cooling is performed according to the molding operation, and molding is not possible. Generation of non-defective products can be prevented accurately.

  Since the vacuum device is connected to the water cooling device as in claim 3, when cracks occur in the mold, the high pressure cooling water is sucked to prevent the cooling water from entering the molten metal. In addition to preventing explosions from occurring, it is possible to remove the air accumulated in the cooling water channel, so that the cooling water fills the cooling water channel without any gaps, so that the mold can be cooled reliably and the mixed air Since there is no insufficient cooling of the mold, it is possible to accurately prevent the occurrence of defective molding.

  Since the water supply mechanism is provided in the cooling device as in claim 4, the temperature of the cooling water in the cooling device can be stabilized, so the load on the temperature control device can be reduced and the adjustment of the cooling water temperature is facilitated. .

  The scale of mineral components, rust, etc. from the cooling water, as the water treatment device comprises a single or multi-stage filter chamber, an activation chamber, a mineral component removal chamber, and an iron removal chamber. Since the cooling water channel is washed and the mineral component in the cooling water is small, the cooling water channel is not clogged or constricted, so it is possible to prevent molding defects due to insufficient cooling water supply. It has various advantages.

  Therefore, the present invention contributes to the development of the industry as a mold cooling water circulation device that solves the conventional problems, and is extremely large.

  Next, the present invention will be described in detail based on the die casting apparatus shown in FIGS.

  The die casting apparatus of the present invention includes a water cooling device 20 that cools the inside of the mold 10, a cooling device 30 that cools the high-temperature cooling water that has cooled the mold 10, and a temperature control device 40 that adjusts the cooling water temperature after cooling. And a water treatment device 50 for removing mineral components and scales contained in the cooling water. The water cooling device 20, the cooling device 30, the temperature control device 40, and the water treatment device 50 are continuously connected so that cooling water is circulated. Further, a vacuum device 60 is connected to the water cooling device 20 so that when the air accumulated in the pipe is discharged and the mold 10 is cracked, the cooling water enters the molten metal and does not cause a steam explosion. .

  The water cooling device 20 includes a high-pressure water supply mechanism 21 and a low-pressure water supply mechanism 22, and supplies high-pressure water or low-pressure water to the mold 10 according to a molding operation. The high-pressure water supply mechanism 21 sucks up the cooling water in the water storage tank 51 of the water treatment device 50 by the high-pressure pump 21a and supplies it to the mold 10 during die casting. Further, the low-pressure water supply mechanism 22 sucks the cooling water in the water storage tank 51 by the low-pressure pump 22a when the mold is opened, and supplies it to the mold 10. Further, the cooled high-temperature cooling water branched and drained from the mold 10 is sent to the cooling device 30 via each relief valve 23 provided in each branch drain pipe, and is die-casted. Sometimes the relief valve 23 is closed. Reference numeral 24 denotes a suction pipe with a filter for sucking cooling water from the water storage tank 51, and the suction pipe with filter 24 is connected to the piping of the high-pressure water supply mechanism 21 and the low-pressure water supply mechanism 22.

  The high-pressure pump 21a of the high-pressure water supply mechanism 21 supplies 2.0 MPa and 150 L / min of cooling water to the mold 10, and the low-pressure pump 22a of the low-pressure water supply mechanism 22 is 0.4 MPa and 90 L / min. The cooling water is supplied to the mold 10. The high-pressure water supply mechanism 21 performs mold cooling at the time of die-cast molding in which molten metal is injected into the mold 10, and when the cooling with high-pressure cooling water is performed, the relief valves 23 are closed. Since the inside of the water cooling device 20 becomes a high pressure and the boiling temperature of the cooling water rises, it is possible to accurately prevent the cooling water from boiling in the pores of the cooling water passage of the mold 10. The low-pressure water supply mechanism 22 performs mold clamping before die casting and mold cooling when the mold is opened after die casting. When cooling with low-pressure cooling water is performed, the relief valves 23 are opened. Therefore, the cooling water is sent to the cooling device 30.

  Further, the vacuum device 60 comprises a vacuum cylinder 61, a vacuum switching valve 62 for switching the vacuum cylinder 61 to a vacuum mode, and a hot water discharge switching valve 63. The hot water discharge switching valve 63 is connected via check valves 64 connected to a plurality of branch drain pipes, and discharges cooling water mixed when the air is extracted to the drain tank 63a. . Further, the vacuum switching valve 62 switches between a vacuuming operation of the vacuuming cylinder 61 for releasing air in the water cooling device 20 and an exhausting operation for exhausting the air sucked into the vacuuming cylinder 61.

  The cooling device 30 is obtained by immersing a spiral heat exchange pipe 32 in a cooling tank 31 filled with cooling water, and the cooling tank 31 is provided with a water supply mechanism 33. The water supply mechanism 33 includes a circulation pump 34a and a water storage tank 34b. By circulating the cooling water in the cooling tank 31 with the cooling water in the water storage tank 34b, a sudden rise in the temperature of the cooling water in the cooling tank 31 is prevented. It is designed to be stable.

  Further, the temperature control device 40 connected to the cooling device 30 sets the temperature of the cooling water delivered from the cooling device 30 to an optimum temperature for mold cooling and supplies it to the water storage tank 51 of the water treatment device 50. is there.

  Further, the water treatment device 50 divides the inside of the water storage tank 51 into a plurality of parts, a filter chamber 52, an activation chamber 54 in which the cooling water has interfacial activity, and a mineral component removal for removing a mineral component contained in the cooling water. The chamber 55 includes an iron removal chamber 56 that removes iron such as rust contained in the cooling water. The filter chamber 52 has a multi-stage structure including a thread-like filter chamber 52a containing a plurality of thread-like filter bodies and a porous ceramic filter chamber 52b containing a porous ceramic filter body. The thread-like filter chamber 52a cools coarse floating matters. The filtration efficiency is improved by filtering and removing from water and filtering and removing small suspended matters that were not filtered and removed by the thread-like filter body 52a by the porous ceramic filter chamber 52b. The cooling water in the activation chamber 54 filled with countless fine tourmaline particles has an interfacial activity due to an electrolysis reaction occurring between the tourmaline particles serving as electrodes. Since the cooling water channel in the mold is washed by the surface active action of the cooling water, it is possible to prevent clogging or constriction of the cooling water channel due to adhesion of scale etc. to the cooling water channel. Subsequently, electrolysis is performed in the mineral component removal chamber 55, and mineral components such as calcium, sodium, potassium, and magnesium contained in the cooling water are adhered to the electrode and removed. Then, the permanent magnets in the iron removal chamber 56 remove scales such as rust and iron contained in the cooling water.

  Further, as shown in FIG. 2, a cooler pin 70 made of a pipe having a diameter of 3 to 5 mm is inserted into the elongated cooling water channel of the mold 10 so that the cooling water is reliably supplied to the innermost part of the cooling water channel. The boiling of cooling water due to insufficient supply of water is prevented.

  In the structure configured as described above, the temperature adjustment device 40 adjusts the cooling water temperature so as to be optimal for mold cooling before starting the die casting. At this time, the water cooling device 20 drives the low pressure pump 22 a of the low pressure water supply mechanism 22 to suck up the cooling water in the water treatment device 50 through the suction pipe 24 with a filter and supply it to the mold 10. The cooling water is sucked up by the low-pressure pump 22a and circulated through the cooling device 30, the temperature control device 40, and the water treatment device 50. By such circulation of cooling water, the mold 10 is adjusted to a temperature suitable for die casting. When the mold 10 reaches a predetermined temperature, die casting is started.

  In die-casting, first, male and female molds 10 are clamped by a clamping device (not shown), and after mold clamping, a molten metal such as aluminum is injected into the mold of the mold 10. When molten metal is injected into the mold 10, the water cooling device 20 is switched from the low pressure water supply mechanism 22 to the high pressure water supply mechanism 21, the high pressure pump 21a is driven, and the relief valve 23 is closed. Since the high-pressure pump 21a discharges the cooling water at a high pressure, the inside of the mold 10 becomes a high pressure of 2.0 MPa, the boiling temperature of the cooling water becomes high, and the boiling of the cooling water becomes difficult to occur, and a slight amount remaining in the cooling water channel of the mold 10 The air is compressed and crushed, and the cooling water is brought into close contact with the inner wall of the cooling water passage to reliably cool the mold 10. In addition, the cooling water fed into the thin cooling water channel of the mold 10 is prevented from boiling by the cooler pin 70, and the mold 10 is reliably cooled, and it is possible to accurately generate temperature unevenness in the mold 10. It is possible to reduce the occurrence of molding defects that are prevented.

  Further, since the water pressure in the water cooling device 20 is measured by a pressure sensor (not shown), when a crack occurs in the cooling water passage of the mold 10 and the pressure is lowered, the high pressure pump 21a of the high pressure water supply mechanism 21 stops its operation. The low pressure pump 22a of the low pressure water supply mechanism 22 is switched so as to start operation. Simultaneously with switching from the high-pressure water supply mechanism 21 to the low-pressure water supply mechanism 22, the vacuum switching valve 62 is switched to operate the vacuum device 60. At the same time, the hot water discharge switching valve 63 is also switched, so that the cooling water in the water cooling device 20 is sucked by the vacuum device 60 and discharged to the drain tank 63a by the hot water discharge switching valve 63. As a result, the cooling water is prevented from entering the molten metal in the mold 10 from the crack of the mold 10, and the cooling water is accurately prevented from coming into contact with the hot molten metal and causing a steam explosion.

  When the mold 10 is cooled and the molten metal is hardened and die casting is completed, the operation of the high-pressure pump 21a of the high-pressure water supply mechanism 21 is stopped, the low-pressure pump 22a of the low-pressure water supply mechanism 22 is activated, and a relief valve. 23 will be opened. As a result, the mold 10 is cooled by the low-pressure water supply mechanism 22. At this time, since the relief valve 23 is opened, the high-temperature cooling water that has cooled the mold 10 flows into the heat exchange pipe 32 of the cooling device 30.

  The high-temperature cooling water flowing in the spiral heat exchange pipe 32 of the cooling device 30 is cooled by the water in the cooling tank 31. Since the water in the water storage tank 34b is circulated in the cooling tank 31 of the cooling device 30 by the circulation pump 34a of the water supply mechanism 33, the rise in the water temperature in the cooling tank 31 is suppressed and stabilized.

  In this way, the high-temperature cooling water is cooled and sent from the heat exchange pipe 32 to the temperature adjustment device 40. Then, the temperature adjustment device 40 adjusts the water temperature to be optimal for mold cooling. The cooling water adjusted to the optimum water temperature by the temperature control device 40 is first fed into the thread-like filter chamber 52a in which the thread-like filter body of the filter chamber 52 of the water treatment device 50 is housed, and coarse floating substances contained in the cooling water are present. Removed.

  Subsequently, the fine floating matter contained in the cooling water is removed by flowing into the porous ceramic filter chamber 52b in which the porous ceramic filter of the filter chamber 52 is accommodated.

  Further, since the cooling water introduced into the activation chamber 54 filled with tourmaline particulate matter is given a surface activation effect, the inside of the cooling water channel of the mold 10 is washed, so that dirt or the like adheres to the cooling water channel. It is possible to prevent the cooling water passage from being narrowed or blocked.

  Subsequently, since the cooling water flowing into the mineral component removal chamber 55 is removed from the cooling water by electrolysis, mineral components such as calcium, sodium, potassium and magnesium contained in the water are ionized and adhere to the electrode. It is possible to prevent the cooling water channel of the mold 10 from being clogged or narrowed by a mineral component.

  Subsequently, the permanent magnets in the iron removal chamber 56 remove scales such as rust and iron contained in the cooling water. The cooling water thus purified is sucked up by the high-pressure pump 21a of the high-pressure water supply mechanism 21 or the low-pressure pump 22a of the low-pressure water supply mechanism 21 through the suction pipe 24 with a filter and supplied to the mold 10. .

It is a schematic explanatory drawing which shows preferable embodiment of this invention. It is an expanded sectional view which shows the state which attached the cooler pin which cools the elongate cooling water channel of the metal mold | die in preferable embodiment of this invention.

Explanation of symbols

10 Mold
20 Water cooling device
23 Relief valve
30 Cooling device
33 Water supply mechanism
40 Temperature controller
50 Water treatment equipment
60 Vacuum equipment
52 Filter room
54 Activation room
55 Mineral component removal chamber
56 Iron removal chamber

Claims (5)

A water cooling device that cools the inside of the mold and a cooling device that cools the high-temperature water after cooling the mold are connected via a relief valve controlled according to the molding operation, and the cooling water temperature cooled by the cooling device is adjusted. A mold cooling water circulation device, wherein a temperature control device is connected, and a water treatment device is connected to the temperature control device to remove mineral components and scales contained in the cooling water. The mold cooling water circulation device according to claim 1, wherein a high-pressure water supply mechanism and a low-pressure water supply mechanism that are switched according to a molding operation are connected to the water cooling device. The mold cooling water circulation device according to claim 1, wherein a vacuum device is connected to the water cooling device. 4. The mold cooling water circulation device according to claim 1, wherein a water supply mechanism is provided in the cooling device. The mold cooling water circulation device according to any one of claims 1 to 4, wherein the water treatment device comprises a single or multi-stage filter chamber, an activation chamber, a mineral component removal chamber, and an iron content removal chamber.

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