JP2013221174A - Casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting apparatus capable of suppressing corrosion of a wall surface of a cooling channel formed in a mold while maintaining cooling efficiency by cooling water under a high temperature environment at the time of casting.SOLUTION: This casting apparatus 1 at least includes a die 10 wherein a cooling channel 11 through which cooling water L passes is formed, and a storage container 12 for storing the cooling water L supplied to the cooling channel 11. In the storage container 12, a sacrifice corrosion part 18 made of a less noble metal than the metal of the wall surface of the cooling channel 11 formed in the die 10 is so arranged as to be brought into contact with the cooling water L stored in the storage container 12, and the wall surface of the cooling channel 11 is electrically connected to the sacrifice corrosion part 18.

Description

  The present invention relates to a casting apparatus including a mold in which a cooling water channel is formed.

  Conventionally, when casting a cast product, the cast product is manufactured by introducing a molten metal (molten metal) into a cavity formed in a mold and cooling the molten metal. Here, since the mold in which the cavity is formed is heated by the molten metal, a cooling water channel is generally formed in the mold. When casting, the cooling water stored in the storage container is circulated in the cooling water channel via the pump, and as a result, the mold is cooled by the cooling water.

  At this time, the cooling water is heated through the mold by the heat of the molten metal. Due to this heated cooling water, the wall surface of the cooling water channel formed in the mold is likely to corrode, and a scale may be generated on the wall surface of the cooling water channel. Generally, since such a scale is an oxide of a metal that forms the wall surface of the cooling water channel of the mold, the thermal conductivity is lower than that of the base metal that forms the mold. For example, when JIS standard: SKD61 is used as a base metal, the thermal conductivity is 23 W / mK, while the oxide is 0.9 to 2.3 W / mK.

  As a result, the mold in which the scale is formed on the wall surface of the cooling water channel may have a lower cooling efficiency than the mold in which the scale is not formed. Furthermore, as the wall surface of the cooling water channel is oxidized, the scale peels off from the wall surface, which may contaminate the cooling water itself.

  Thus, in an apparatus that uses cooling water to cool, it is important to suppress corrosion due to the cooling water, and in view of such points, a rust preventive coating or Techniques for forming a sacrificial corrosion layer have been proposed.

  For example, Patent Document 1 discloses a technique in which a sacrificial corrosion layer made of a zinc alloy is formed on the inner wall of a metal tank. According to this technology, by providing a sacrificial corrosion layer, the metal of the sacrificial corrosion layer is corroded before the metal of the base metal of the tank corrodes (oxidizes), thereby suppressing the corrosion (oxidation) of the base material. can do.

Japanese Patent Laid-Open No. 2001-116489

  However, when the technique described in Patent Document 1 is applied to the above-described casting apparatus, the sacrificial corrosion layer is exposed to a high temperature environment at the time of casting. Therefore, the progress of the corrosion is faster than that in a normal temperature environment. For this reason, when the sacrificial corrosion layer is no longer corroded (it has been oxidized), the sacrificial corrosion layer must be coated again on the wall surface of the cooling water channel. Furthermore, since the sacrificial corrosion layer is directly coated on the wall surface of the cooling water channel, the cooling efficiency of the cooling water channel may be lowered depending on the material.

  The present invention has been made in view of such points, and the object of the present invention is to provide cooling formed in a mold while maintaining cooling efficiency with cooling water in a high temperature environment during casting. It is providing the casting apparatus which can suppress the corrosion of the wall surface of a water channel.

  As a result of intensive studies, the inventor has found that the wall surface of the cooling water channel formed in the mold of the casting apparatus is in a harsh environment that is exposed to the cooling water at a high temperature. While considering efficiency, we thought it was not a good idea to form a sacrificial corrosion layer. That is, the inventors can maintain the cooling efficiency without corroding the cooling water channel by separating the sacrificial corrosion metal from the cooling water channel and performing sacrificial corrosion at a location different from the cooling water channel. I thought.

  The present invention is based on such an idea of the inventors, and a casting apparatus according to the present invention includes a mold in which a cooling water channel through which cooling water passes is formed, and cooling water supplied to the cooling water channel. A casting apparatus including at least a storage container that stores a sacrificial corrosion portion made of a metal that is lower than a metal on a wall surface of a cooling water channel formed in the mold. It arrange | positions so that the cooling water accommodated in the inside may be contacted, and the wall surface of the said cooling water channel and the said sacrificial corrosion part are electrically connected, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, the metal mold | die heated at the time of casting can be cooled by supplying the cooling water accommodated in the storage container to the cooling water channel formed in the metal mold | die (mold | template). At this time, the sacrificial corrosion portion made of metal that is lower than the metal on the wall surface of the cooling water channel of the mold is electrically connected to the wall surface of the cooling water channel and is in contact with the cooling water in the container. The wall surface of the cooling water channel does not corrode, and a current flows through the connection portion electrically connected to the sacrificial corrosion portion, so that the metal in the sacrificial corrosion portion is preferentially corroded.

  As a result, even if the cooling water passes through the surface of the cooling water channel formed in the mold exposed to a high temperature environment due to the heat of the molten metal, the wall surface of the cooling water channel is almost Does not corrode (scale is difficult to form). Thereby, while being able to maintain the cooling efficiency of a metal mold | die, the quality of a cooling water can also be maintained.

  Here, the `` metal that is lower than the metal on the wall of the cooling water channel formed on the mold '' according to the present invention has a higher ionization tendency than the metal on the wall of the cooling water channel formed on the metal mold, That is, it refers to a metal that easily becomes an ion.

  Moreover, the wall surface of the cooling water channel may be the metal itself of the mold material (base material), and a metal film may be formed on the wall surface. However, as a more preferable aspect, the wall surface of the cooling water channel is a wall surface coated with a metal film, and the metal of the sacrificial corrosion portion is made of a metal that is lower than the metal of the metal film, The metal is made of a metal that is baser than the metal of the mold base material.

  According to this aspect, due to the same phenomenon as described above, the metal in the sacrificial corrosion portion is made of a metal that is baser than the metal in the metal coating, so that the sacrificial corrosion portion is present before the metal coating on the wall surface of the cooling channel. Corrosion. In addition, even if the corrosion of the sacrificial corrosion portion may be hindered, the metal of the metal film is made of a metal that is baser than the metal of the mold base material, so The metal coating will corrode first. As a result, corrosion of the mold base material can be reduced.

  As a more preferred embodiment, the container and the cooling water channel of the mold are connected via a cooling pipe, and the metal coating is formed on at least a wall surface of the cooling pipe on the mold side. It is covered.

  According to this aspect, among the cooling pipes connecting the container and the cooling water channel of the mold, the cooling pipe on the mold side is exposed to a higher temperature than the other cooling pipes. By coating the inner wall surface with the above-described metal coating, corrosion of the wall surface in the pipe can be reduced. In particular, in the cooling pipe on the discharge side from which cooling water is discharged from the mold, the cooling water into which the heat from the mold is input passes through the cooling pipe on the discharge side. It is preferable that the metal coating is coated on the wall surface in the cooling pipe on the mold side.

  As a still more preferable aspect, the wall surface of the cooling water channel and the sacrificial corrosion portion are electrically connected via an ammeter. According to this aspect, when the sacrificial corrosion portion corrodes, as described above, a current flows through the electrically connected connection portion. Therefore, by measuring this current with an ammeter, the sacrificial corrosion portion is corroded. The degree of progress can be grasped.

  ADVANTAGE OF THE INVENTION According to this invention, the corrosion of the wall surface of the cooling water channel formed in the metal mold | die can be suppressed, maintaining the cooling efficiency by cooling water in the high temperature environment at the time of casting.

The typical conceptual diagram of the casting apparatus which concerns on embodiment of this invention. The flowchart of the management method of the casting apparatus which concerns on this embodiment.

  Hereinafter, a casting apparatus according to an embodiment of the present invention will be described with reference to the following drawings.

  FIG. 1 is a schematic conceptual diagram of a casting apparatus according to an embodiment of the present invention. The casting apparatus 1 according to the present embodiment is a casting apparatus for casting, for example, an aluminum or iron casting.

  As shown in FIG. 1, the casting apparatus 1 is provided with a mold (mold) 10. Although details are not shown in FIG. 1, the mold 10 is composed of an upper mold and a lower mold. When the upper and lower molds are clamped, the mold 10 has a cavity (in accordance with the shape of the casting ( (Not shown) is formed. When casting, a molten aluminum or iron is injected into the cavity. Further, a cooling water passage 11 through which the cooling water L passes is formed in the mold 10 in the mold 10.

  In addition, the casting apparatus 1 is provided with a storage container 12 that stores the cooling water L supplied to the cooling water channel 11 of the mold 10. The storage container 12 and the cooling water channel 11 of the mold 10 are cooled. It is connected via a pipe 13 for use. A pump 15 for pumping the cooling water L to the cooling water passage 11 is connected to the cooling pipe 13, whereby the cooling water L in the storage container 12 can be circulated to the mold 10.

  Here, the mold 10 is made of an iron-based or copper-based metal, and the wall surface of the cooling water channel 11 is a wall surface coated with a metal coating 16. Further, a metal coating 17 made of the same metal as the metal coating 16 is formed on the inner wall surface of the cooling pipe 13 on the mold 10 side, and the metal coating 16 of the cooling water channel 11 and the inner wall surface of the cooling pipe 13 are formed. The metal film 17 is in a contacted state (a state in which conduction is possible). Such metal coatings 16 and 17 can be coated on these wall surfaces by a generally known plating process.

  Further, a sacrificial corrosion block (sacrificial corrosion portion) 18 is disposed in the storage container 12, and the sacrificial corrosion block 18 is disposed so as to contact the cooling water L stored in the storage container 12. . That is, at least a part of the sacrificial corrosion block 18 is immersed in the cooling water L.

  Further, the wall surface of the cooling water channel 11 (specifically, the metal coating 17) and the sacrificial corrosion block 18 are electrically connected via the ammeter 30 by a wiring 31 made of a metal having a low electrical resistance such as a copper wire. Yes.

  Further, the sacrificial corrosion block 18 is provided with a filter 19 so that sludge or the like generated by corrosion of the sacrificial corrosion block 18 (described later) does not flow near the supply port of the storage container 12 to which the cooling water L is supplied to the mold 10. Is provided. However, if such a function can be provided, for example, a partition plate is provided between the sacrificial corrosion block 18 and the supply port so that the cooling water L in the vicinity of the sacrificial corrosion block 18 overflows. Also good.

  Here, the sacrificial corrosion block 18 is made of a metal that is lower than the metal constituting the wall surface of the cooling water channel 11 formed in the mold 10. Specifically, since the wall surface of the cooling water channel 11 is a wall surface coated with the metal film 16 described above, the metal of the sacrificial corrosion block 18 is made of a metal that is baser than the metal of the metal films 16 and 17. Become. Further, the metal of the metal coating 16 is made of a metal that is lower than the base metal of the mold 10.

  The following is a brief description of such metal combinations. In general, examples of the material of the mold 10 include iron-based materials such as steel, and copper-based materials such as copper or copper alloys. For example, when an iron-based material is selected as the base material of the mold 10, the metal coatings 16, 17 are made of a metal that is baser than iron, that is, a metal that has a higher ionization tendency than iron, such as chromium, zinc, Select calcium, magnesium, aluminum, or titanium.

  Further, as the material of the sacrificial corrosion block 18, a base metal (a metal having a high ionization tendency) is selected as compared with the metal of the selected metal coatings 16 and 17. For example, when chromium is selected as the material of the metal coatings 16 and 17, zinc, calcium, magnesium, aluminum, or titanium, which is a metal having a higher ionization tendency than chromium, is selected as the material of the sacrificial corrosion block 18. It will be.

  On the other hand, when a copper-based material is selected as the base material of the mold 10, as the material of the metal coatings 16 and 17, a metal that is baser than copper, that is, a metal that has a higher ionization tendency than copper, nickel, Cobalt, iron, chromium, zinc, calcium, magnesium, aluminum, or titanium can be selected.

  Further, as the material of the sacrificial corrosion block 18, a base metal (a metal having a high ionization tendency) is selected as compared with the metal of the selected metal coatings 16 and 17. For example, when tin is selected as the material of the metal coatings 16 and 17, the material of the sacrificial corrosion block 18 is nickel, cobalt, iron, chromium, zinc, calcium, which is a metal having a higher ionization tendency than tin. Either magnesium, aluminum, or titanium can be selected.

  According to this embodiment, the cooling water L accommodated in the container 12 is supplied to the cooling water channel 11 formed in the mold (mold) 10, thereby cooling the mold 10 heated during casting. be able to.

  At this time, the sacrificial corrosion block 18 made of a metal lower than the metal of the metal coating 16 constituting the wall of the cooling water channel 11 of the mold 10 is electrically connected to the metal coating 16 constituting the wall of the cooling water channel 11. And since it is in the state which contacted the cooling water L in the storage container 12, the metal film 16 which comprises the wall surface of the cooling water channel 11 does not corrode, but it is an electric current to the connection part electrically connected with the sacrificial corrosion block 18. And the metal of the sacrificial corrosion block 18 is preferentially corroded.

  As a result, even if the cooling water L passes through the metal coating 16 of the cooling water channel 11 formed on the mold by being exposed to a high temperature environment due to heat from the molten metal, the cooling water channel The metal coating 16 hardly corrodes (scale is difficult to be formed). Thereby, while being able to maintain the cooling efficiency of the metal mold | die 10, the water quality of the cooling water L can also be maintained.

  Even if sludge adherence and corrosion may be hindered on the surface of the sacrificial corrosion block 18, the metal of the metal coating 16 is made of a metal that is baser than the metal of the base material of the mold 10. The metal coating 16 is corroded preferentially over the base material. As a result, corrosion of the base material of the mold 10 can be reduced.

  Furthermore, when the cooling pipe on the mold 10 side is exposed to a higher temperature than the other cooling pipes, a metal film 17 is also formed on the inner wall surface of the cooling pipe on the mold 10 side. Since they are in contact with each other, corrosion of the cooling pipe in this portion can be reduced.

  In addition, since the metal coating 16 constituting the wall surface of the cooling water channel 11 and the sacrificial corrosion block 18 are electrically connected via the ammeter 30, when the sacrificial corrosion block 18 corrodes, As described above, a current flows through the electrically connected wiring 31. By measuring this current with the ammeter 30, the degree of progress of the corrosion of the sacrificial corrosion block 18 can be grasped.

  FIG. 2 is a flowchart of the management method of the casting apparatus according to the present embodiment. First, in step S <b> 201, it is confirmed whether a current whose current value detected by the ammeter 30 is equal to or greater than a predetermined value flows during casting by the casting apparatus 1. Here, if the current detected by the ammeter 30 is greater than or equal to the predetermined value, the process proceeds to step S202, and it is considered that the sacrificial corrosion block 18 is sacrificing. For this reason, it can grasp | ascertain that the corrosion prevention of the wall surface of the cooling water channel 11 in the metal mold | die 10 is performed (corrosion prevention establishment).

  On the other hand, if the current value detected by the ammeter 30 is less than the predetermined value, the process proceeds to step S203, and the corrosion condition (sacrifice) of the sacrificial corrosion block 18 is confirmed. At this time, if it can be determined that the sacrificial corrosion block 18 has been oxidized (corroded), the process proceeds to step S204, and the sacrificial corrosion block 18 is replaced. After the replacement, the process returns to step S201 to check the ammeter 30.

  If it can be determined in step S203 that the sacrificial corrosion block 18 is not corroded, the process proceeds to step S205, and the wiring 31 connecting the wall surface (specifically, the metal coating 17) of the cooling water channel 11 and the sacrificial corrosion block 18 is connected. Is disconnected, or the connection of the wiring 31 is considered to be defective. Therefore, the replacement of the wiring 31 or the connection of the wiring 31 is confirmed. After performing this operation, the process returns to step S201, and the current value detected by the ammeter 30 is confirmed.

  Thus, by measuring the current of the ammeter 30, the state of the sacrificial corrosion block 18 can be managed, and thereby the corrosion of the wall surface of the cooling water channel 11 can be suppressed.

  Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and even if there is a design change within a scope not departing from the gist of the present invention, they are not limited to this embodiment. It is included in the invention.

  In this embodiment, the wall surface of the cooling water channel is a wall surface on which a metal film is formed. However, the wall surface of the cooling water channel formed on the mold is the base metal of the mold, and the metal of the sacrificial corrosion block is If the base metal is lower than the base metal, the sacrificial corrosion block is preferentially corroded over the wall surface of the cooling water channel, so that the metal coating does not necessarily have to be formed.

  1: casting apparatus, 10: mold (mold), 11: cooling water channel, 12: container, 13: piping for cooling, 15: pump, 16: metal coating, 17: metal coating, 18: sacrificial corrosion block (sacrificial) Corrosion part), 19: filter, 30: ammeter, 31: wiring, L: cooling water

Claims (4)

A casting apparatus comprising at least a mold in which a cooling water passage through which cooling water passes is formed, and a storage container that contains the cooling water supplied to the cooling water passage,
In the storage container, a sacrificial corrosion portion made of a metal lower than the metal on the wall surface of the cooling water channel formed in the mold is disposed so as to contact the cooling water stored in the storage container. ,
The casting apparatus, wherein a wall surface of the cooling water channel and the sacrificial corrosion portion are electrically connected. The wall surface of the cooling water channel is a wall surface coated with a metal coating,
The metal of the sacrificial corrosion portion is made of a base metal rather than the metal of the metal coating,
The casting apparatus according to claim 1, wherein the metal of the metal coating is made of a metal that is baser than the metal of the base material of the mold.   The container and the cooling water channel of the mold are connected via a cooling pipe, and at least the wall surface in the cooling pipe on the mold side is covered with the metal coating. The casting apparatus according to claim 2.   The casting apparatus according to any one of claims 1 to 3, wherein the wall surface of the cooling water channel and the sacrificial corrosion part are electrically connected via an ammeter.

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