JP2007319936A - Casting device and casting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a casting device where the whole of the device is effectively miniaturized, also, a desired casting operation can be efficiently performed, and further, the setup change of a die can be facilitated. <P>SOLUTION: The casting device 20 is provided with: a die 21 for casting molding; and a metal particulate generation mechanism 22 and a high temperature gas generation mechanism 24 directly connected to the die 21 freely attachable/detachable, respectively. The metal particulate generation mechanism 22 is provided with: a metal holding part 30 to be stored with magnesium 26; a cylindrical part 32 for feeding the magnesium 26 with gaseous argon; a gaseous argon flow rate control part 34 for controlling the flow rate of the gaseous argon fed to the cylindrical part 32; and a gaseous argon heating control part 36 for heating the gaseous argon fed to the cylindrical part 32 to a prescribed temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a casting apparatus for pouring molten metal into a mold cavity to obtain a cast product.

  For example, various aluminum parts are cast widely by pouring a molten aluminum or aluminum alloy (hereinafter simply referred to as aluminum) into a cavity in a casting mold.

  By the way, in the casting process of aluminum parts, an oxide film is easily generated on the surface of the molten aluminum poured into the cavity. For this reason, it has been pointed out that the surface tension of the molten aluminum increases, the fluidity of the molten metal decreases, and various casting defects occur.

  Therefore, for example, a reduction casting mold disclosed in Patent Document 1 is used. Specifically, as shown in FIG. 8, the mold 1 is provided with a molding cavity 1 a, and the molten aluminum 3 stored in the pouring tank 2 is poured into the cavity 1 a through the hole 4. Hot water is free.

  A nitrogen gas cylinder 6 is connected to the mold 1 via a pipe 5, while an argon gas cylinder 7 is connected to a heating furnace 9 via a pipe 8. The argon gas cylinder 7 is connected to a tank 11 in which magnesium powder is used via a pipe 10, and the tank 11 is connected to a pipe 8 via a pipe 12.

  The heating furnace 9 is configured to be able to heat the furnace temperature to a predetermined temperature via a heater 13, and the heating furnace 9 communicates with the cavity 1 a via a pipe 14 and a pipe 15.

  In such a configuration, first, nitrogen gas is injected from the nitrogen gas cylinder 6 into the cavity 1a of the mold 1 through the pipe 5, and the air in the cavity 1a is purged with the nitrogen gas. For this reason, the cavity 1a has a substantially non-oxygen atmosphere. On the other hand, argon gas is injected into the heating furnace 9 from the argon gas cylinder 7 through the pipe 8. Therefore, the inside of the heating furnace 9 is in an oxygen-free state.

  Next, argon gas is supplied into the tank 11 from the argon gas cylinder 7 through the pipe 10, and the magnesium powder in the tank 11 is sent into the heating furnace 9 from the pipe 8. In that case, in the heating furnace 9, it is heated by the heater 13 to the furnace temperature more than the temperature which magnesium powder sublimates. Thereby, the magnesium powder sent to the heating furnace 9 is sublimated to become magnesium gas, and this magnesium gas is injected into the cavity 1 a from the pipe 14 through the pipe 15. Further, nitrogen gas is injected from the nitrogen gas cylinder 6 into the cavity 1a.

For this reason, in the cavity 1a, magnesium gas and nitrogen gas react to produce magnesium nitride (Mg ₃ N ₂ ). This magnesium nitride is deposited as powder on the inner wall surface of the cavity 1a.

  Therefore, the molten aluminum 3 in the pouring tank 2 is poured from the hole 4 into the cavity 1a. Magnesium nitride is an active substance, and oxygen is removed from the oxide film on the surface of the molten aluminum 3 when the molten aluminum 3 comes into contact with the magnesium nitride in the cavity 1a. Thereby, the surface of the molten aluminum 3 is reduced to pure aluminum.

JP 2001-321920 A

  However, the above-described prior art includes the heating furnace 9 provided with the heater 13, and there is a problem that the entire apparatus is considerably large. Therefore, there is a possibility that the amount of heat required for the reaction of magnesium gas increases. Moreover, in order to inject the magnesium gas generated in the heating furnace 9 into the cavity 1a, a relatively long pipe 14 is required. Furthermore, pipes 5 and 14 and a pipe 15 are connected to the mold 1. Thereby, there are many setup change processes at the time of exchange of metallic mold 1, and there is a problem that work is complicated.

  The present invention solves this type of problem, and it is possible to effectively reduce the size of the entire apparatus, efficiently perform a desired casting operation, and easily change the mold setup. The purpose is to provide.

  In the casting apparatus according to the present invention, a metal particle generating mechanism that directly introduces the metal fine particles into the cavity immediately after generating the metal fine particles in a mold for supplying a molten metal to the cavity to obtain a cast product, and the metal fine particles; A reactive gas supply mechanism that supplies a reactive gas for generating an active substance (hereinafter also referred to as an oxidizable substance) that is more active against oxygen than the molten metal to the cavity, Directly connected to different supply sites.

  Therefore, first, metal fine particles immediately after generation are introduced into the cavity from the fine particle generation mechanism, and a reactive gas is supplied from the reactive gas supply mechanism so that the metal fine particles react with the reactive gas. An active substance is produced. Next, when the molten metal is poured into the cavity, the active substance is preferentially combined with oxygen in the cavity, and oxidation of the molten metal surface can be effectively suppressed. Therefore, it becomes possible to maintain the fluidity of the molten metal, and a good casting operation can be performed smoothly.

  In addition, since the fine particle generation mechanism is directly connected to the mold, a pipe for metal fine particles is not required, and a conventional large heating furnace is not required. As a result, the entire apparatus can be easily reduced in size and simplified, and the amount of heat required for the reaction can be reduced. Furthermore, by attaching / detaching the fine particle generation mechanism and the reactive gas supply mechanism to / from the mold, for example, the step change process at the time of replacing the mold is effectively reduced, and the work efficiency is improved.

Here, for example, the molten metal is molten aluminum, the fine metal particles are fine magnesium particles, the reactive gas is nitrogen gas, and the active substance is magnesium nitride (Mg ₃ N ₂ ). The reaction results in Mg ₃ N ₂ fine particles. These Mg ₃ N ₂ fine particles are a substance that is easily oxidized, and are preferentially bonded to oxygen rather than the molten aluminum used for aluminum casting, and can effectively suppress oxidation of the molten aluminum.

  In addition, a reaction unit is directly connected to a mold for supplying a molten metal to the cavity to obtain a cast product, and the reaction unit includes a fine particle generation mechanism for generating metal fine particles, and a reaction with the metal fine particles to A reactive gas supply mechanism that supplies a reactive gas that generates an active substance more active than oxygen than the molten metal is connected.

  Therefore, first, the metal fine particles immediately after generation are introduced into the reaction unit from the fine particle generation mechanism, and the reactive gas is supplied from the reactive gas supply mechanism, and the metal fine particles and the reactive gas react with each other. An active substance is produced. Then, the active substance is supplied from the reaction unit to the cavity, and molten metal is poured into the cavity. For this reason, the active substance is preferentially combined with oxygen in the cavity, and it becomes possible to effectively suppress the oxidation of the surface of the molten metal and maintain the fluidity of the molten metal, thereby smoothly performing a good casting operation. It can be carried out.

  Furthermore, an active substance is generated by directly introducing the active substance into the cavity immediately after generating an active substance that is more active against oxygen than the molten metal in a mold for supplying a molten metal to the cavity to obtain a cast product. The mechanism is directly connected. At that time, the molten metal is a molten aluminum, and the active substance is at least one of magnesium nitride and magnesium fine particles.

  The magnesium fine particles are a substance that is more easily oxidized than the molten aluminum, and the oxidation of the molten aluminum can be effectively prevented. Therefore, when a molten aluminum is used, a good casting operation is performed reliably and efficiently.

  In the casting apparatus according to the present invention, the metal fine particles and the reactive gas immediately after generation are supplied to the cavity, and an active substance that is a substance that is easily oxidized is generated. For this reason, an active substance couple | bonds preferentially with the oxygen in a cavity, and can suppress the oxidation of the molten metal surface poured into the said cavity effectively. Therefore, it becomes possible to maintain the fluidity of the molten metal, and a good casting operation can be performed smoothly.

  In addition, since the fine particle generation mechanism is directly connected to the mold, a pipe for metal fine particles is not required, and a conventional large heating furnace is not required. As a result, the entire apparatus can be easily reduced in size and simplified, and the amount of heat required for the reaction can be reduced. Further, by attaching / detaching the fine particle generation mechanism and the reactive gas supply mechanism to / from the mold, for example, the step change process at the time of mold replacement is effectively reduced, and the work efficiency is improved.

  In addition, a reaction unit is directly connected to the mold, and after the active metal is generated by supplying the metal fine particles and the reactive gas immediately after generation to the reaction unit, the active substance is directly in the cavity of the mold. be introduced. Therefore, a desired active substance can be reliably supplied to the cavity, and oxidation of the surface of the molten metal poured into the cavity can be satisfactorily suppressed.

  Furthermore, the active substance is directly introduced into the cavity immediately after generating the active substance more active against oxygen than the molten metal. Thereby, the oxidation of the surface of the molten metal poured into the cavity is efficiently suppressed, and the apparatus can be downsized.

  FIG. 1 is an explanatory diagram of a schematic configuration of a main part of a casting apparatus 20 according to the first embodiment of the present invention.

  The casting apparatus 20 includes a casting mold 21, a metal fine particle generation mechanism 22 and a high-temperature gas generation mechanism (reactive gas supply mechanism) 24 that are individually detachably connected to the mold 21. The metal fine particle generation mechanism 22 includes a metal holding unit 30 in which a powdered metal, for example, magnesium 26 is accommodated via filters (porous bodies) 28a and 28b made of, for example, SUS material (stainless steel), A cylindrical part 32 that is provided in the metal holding part 30 and passes through the filter 28a and supplies an inert gas, for example, argon gas, to the magnesium 26, and a flow rate of the argon gas supplied to the cylindrical part 32 And an argon gas heating control unit 36 provided in the cylindrical part 32 and for heating the argon gas supplied to the magnesium 26 to a predetermined temperature.

  The metal holding part 30 is detachable from the mold 21 and communicates with the cavity 40 in the mold 21. The metal holding part 30 is formed in a substantially box shape that penetrates, and a molten metal backflow prevention mechanism 42 is attached to the hole 40a side of the mold 21 as necessary.

  As shown in FIGS. 1 and 2, the molten metal backflow prevention mechanism 42 includes a stay 43 fixed to the mold 38 and a slide key 44 slidable with respect to the stay 43. The stay 43 is formed with a hole 43a coaxially with the hole 40a, and the slide key 44 is formed with a hole 44a capable of opening and closing the hole 40a and the hole 43a. In addition, when the metal fine particle generation mechanism 22 is disposed at a portion where there is no possibility of generating a backflow of the molten metal, the molten metal backflow prevention mechanism 42 may not be employed.

  For example, the cartridge 46 is accommodated in the metal holding unit 30 in a replaceable manner. As shown in FIG. 2, the cartridge 46 includes a substantially cylindrical case 48, and a filter 28 a is inserted into the case 48 while sitting on the bottom 48 a on one end side. In the case 48, the powdered magnesium 26 is sealed between the filter 28a and the filter 28b. A thread groove 50 is formed on the inner periphery of the case 48 on the other end side, and a set screw 51 is screwed into the thread groove 50.

  The metal holding unit 30 is provided with a lid 30a that can be opened and closed in order to attach and detach the cartridge 46. For example, the lid 30 a may be configured to be swingable with respect to the metal holding unit 30 via a hinge (not shown), or may be configured to be slidable with respect to the metal holding unit 30. .

  One end of a cylindrical portion 32 is attached to the metal holding portion 30. A heating element, for example, a heating wire 54 is disposed in the cylindrical portion 32, and the heating wire 54 is connected to a power source 58 via a current / voltage controller 56 outside the cylindrical portion 32. The argon gas heating control unit 36 is configured (see FIG. 3).

  A pipe line 60 is connected to the end of the cylindrical part 32, and an argon gas cylinder 62 constituting the argon gas flow rate control unit 34 is connected to the pipe line 60. The argon gas cylinder 62 can communicate with the cylindrical portion 32 via the on-off valve 64 and the flow rate control valve 65.

  The high-temperature gas generation mechanism 24 is configured in substantially the same manner as the metal fine particle generation mechanism 22, and includes a cylindrical portion 66 detachable from the mold 21, a nitrogen gas flow rate control unit 68, and a nitrogen gas heating control unit 70. I have. The nitrogen gas heating control unit 70 includes a heating wire 74 disposed in the cylindrical portion 66, a current / voltage controller 76, and a power source 78. The nitrogen gas flow rate control unit 68 includes a pipe line 80 that communicates with the other end of the cylindrical part 66, and the pipe line 80 is connected to the nitrogen gas cylinder 82 via an on-off valve 84 and a flow rate control valve 86.

  The operation of the casting apparatus 20 configured as described above will be described below.

  First, the metal holding unit 30 holds the powdered magnesium 26 held by the cartridge 46. Specifically, outside the metal holding part 30, the case 48 constituting the cartridge 46 is arranged with the bottom part 48a facing downward, and the filter 28a is inserted while sitting on the bottom part 48a. Next, after powdery magnesium 26 is appropriately put on the filter 28a, the filter 28b is inserted. Further, the set screw 51 is screwed into the thread groove 50 of the case 48, and the magnesium 26 is sealed in the cartridge 46 (see FIG. 2).

  In the metal holding part 30, the lid 30a is rocked or slid in the opening direction, and after the cartridge 46 is inserted into the metal holding part 30, the lid 30a is rocked or slid in the closing direction. As a result, the cartridge 46 is loaded into the metal holding unit 30.

  Therefore, in the state where the hole 43a and the hole 40a of the stay 43 are opened via the hole 44a of the slide key 44 constituting the molten metal backflow prevention mechanism 42, the argon gas heating is performed prior to the argon gas flow rate control unit 34. The control unit 36 is driven (see FIG. 1). In the argon gas heating control unit 36, current / voltage is controlled by the controller 56, the heating wire 54 generates heat, and the inside of the cylindrical part 32 is heated. When the inside of the cylindrical part 32 reaches a predetermined temperature, the argon gas flow rate control part 34 is driven.

  In the argon gas flow rate control unit 34, the argon gas led out from the argon gas cylinder 62 is introduced into the cylindrical portion 32 from the pipe line 60 while the flow rate is controlled by the flow rate control valve 65. The argon gas is heated to a predetermined temperature via the heating wire 54 when passing through the cylindrical portion 32, and the heated argon gas passes through the filter 28 b constituting the metal holding unit 30 and is blown to the magnesium 26. It is done.

  For this reason, the magnesium 26 is evaporated and magnesium gas is generated, and this magnesium gas is supplied into the cavity 40 of the mold 21 along the flow of the argon gas. At that time, high-temperature nitrogen gas is supplied to the cavity 40 via the high-temperature gas generation mechanism 24.

  In the high temperature gas generation mechanism 24, as in the metal fine particle generation mechanism 22, first, the nitrogen gas heating control unit 70 is driven to heat the inside of the cylindrical portion 66 to a predetermined temperature, and then the nitrogen gas flow rate control is performed. The unit 68 is driven. Therefore, a predetermined amount of nitrogen gas supplied from the nitrogen gas cylinder 82 to the cylindrical portion 66 is heated to a desired temperature and then supplied from the cylindrical portion 66 into the cavity 40.

Thereby, in the cavity 40, a part of the magnesium gas is aggregated to be changed into magnesium fine particles, and the unaggregated magnesium gas and the high-temperature nitrogen gas are reacted (3Mg + N ₂ → Mg ₃ N ₂ ) Fine particles of (Mg ₃ N ₂ ) are generated. Further, Mg ₃ N ₂ fine particles are also generated when magnesium fine particles react with high-temperature nitrogen gas.

Next, the slide key 44 constituting each molten metal backflow prevention mechanism 42 slides, the hole 44a moves, and the hole 43a and the holes 40a, 40b of the stay 43 are closed. In this state, for example, molten aluminum (not shown) is poured into the cavity 40 of the mold 38. At that time, Mg ₃ N ₂ fine particles and magnesium fine particles are present in the cavity 40, and the Mg ₃ N ₂ fine particles are preferentially bonded to oxygen in the cavity 40, thereby effectively oxidizing the molten aluminum. To suppress. For this reason, it is possible to maintain the fluidity of the molten aluminum and to perform a good casting operation.

  On the other hand, magnesium fine particles are a substance (active substance) that is more easily oxidized than aluminum. Therefore, the magnesium fine particles are combined with oxygen in the cavity 40 and can effectively prevent oxidation of the molten aluminum.

  In this case, in the first embodiment, the metal holding part 30 constituting the metal fine particle generation mechanism 22 is directly attached to the mold 21 and the powdered magnesium 26 is accommodated in the metal holding part 30. Yes. A predetermined amount of argon gas is introduced into the cylindrical portion 32 maintained at a predetermined temperature via the argon gas heating control unit 36 via the argon gas flow rate control unit 34.

  Thereby, the magnesium 26 hold | maintained at the metal holding | maintenance part 30 is heated by the argon gas controlled by the predetermined amount and predetermined temperature, and can generate desired magnesium particulates (and magnesium gas) reliably. In addition, the magnesium fine particles generated by the metal holding unit 30 are directly supplied to the cavity 40 in the mold 21.

  Accordingly, a conventional relatively large heating furnace and a long pipe for metal fine particles are not required, and the entire casting apparatus 20 is effectively reduced in size and simplified, and magnesium fine particles (and magnesium gas). It is possible to obtain the effect that the reaction control can be carried out easily and economically with a low heat quantity.

Further, nitrogen gas, which is a reactive gas controlled to a predetermined amount and a predetermined temperature, is supplied into the cavity 40 via the high temperature gas generation mechanism 24. For this reason, magnesium gas and nitrogen gas react satisfactorily in the cavity 40, and it becomes possible to produce Mg ₃ N ₂ fine particles satisfactorily.

  Furthermore, the metal fine particle generation mechanism 22 and the high temperature gas generation mechanism 24 are detachable from the mold 21. Thereby, the setup change process at the time of metal mold | die exchange is reduced effectively, the work efficiency is achieved, and the casting apparatus 20 can be easily applied to various metal molds other than the above-mentioned metal mold 21. There is an advantage that it is excellent in versatility.

  In the first embodiment, the powdered magnesium 26 is held by the cartridge 46 so as to be detachable from the metal holding portion 30, but the present invention is not limited to this. For example, the magnesium 26 may be directly filled into the metal holding unit 30 or, for example, a long magnesium 26a such as a wire or a band may be held by the cartridge 46 as shown in FIG. It may be arranged in the metal holding part 30.

  FIG. 4 is a schematic diagram for explaining a main part of a casting apparatus 100 according to the second embodiment of the present invention. In addition, the same referential mark is attached | subjected to the component same as the casting apparatus 20 which concerns on 1st Embodiment, and the detailed description is abbreviate | omitted. The same applies to the third to fifth embodiments described below.

  The casting apparatus 100 includes a mold 21 and an active substance generating mechanism 102 that is directly and detachably connected to the mold 21. The active substance generating mechanism 102 includes a metal holding part 30, a cylindrical part 32 attached to the metal holding part 30, a nitrogen gas flow rate control part 68 for supplying a predetermined amount of nitrogen gas to the cylindrical part 32, A nitrogen gas heating control unit 70 is provided in the cylindrical portion 32 and heats the nitrogen gas to a predetermined temperature.

  In the casting apparatus 100 configured as described above, the powdery magnesium 26 (or long magnesium) is accommodated in the metal holding unit 30, and after the nitrogen gas heating control unit 70 is first driven, The gas flow rate control unit 68 is driven. For this reason, the inside of the cylindrical part 32 is heated to a predetermined temperature, and a predetermined amount of nitrogen gas supplied from the nitrogen gas cylinder 82 into the cylindrical part 32 is heated to a desired temperature.

Accordingly, the magnesium 26 (or long magnesium) accommodated in the metal holding part 30 evaporates when nitrogen gas having a predetermined amount and a desired temperature is supplied through the filter 28b, and at least a part thereof is evaporated. It reacts with nitrogen gas to produce Mg ₃ N ₂ fine particles. As a result, Mg ₃ N ₂ fine particles and magnesium fine particles are introduced into the cavity 40 of the mold 21 and are preferentially combined with oxygen in the cavity 40 to effectively suppress oxidation of the molten aluminum. It becomes possible.

As described above, in the second embodiment, the entire apparatus can be easily downsized and simplified, and the reaction can be easily controlled to generate desired Mg ₃ N ₂ fine particles. The same effect as in the first embodiment can be obtained.

  FIG. 5 is a schematic diagram for explaining a main part of a casting apparatus 120 according to the third embodiment of the present invention.

  The casting apparatus 120 includes a mold 21 and an active substance generating mechanism 122 that is directly and detachably connected to the mold 21. The active substance generating mechanism 122 includes a metal holding unit 30, a cylindrical part 32 attached to the metal holding part 30, an argon gas flow rate control unit 34 for supplying a predetermined amount of argon gas to the cylindrical part 32, An argon gas heating control unit 36 is provided in the cylindrical portion 32 and heats the argon gas to a predetermined temperature.

  In the casting apparatus 120 configured as described above, a predetermined amount is added to the cylindrical portion 32 via the argon gas flow rate control unit 34 while the inside of the cylindrical portion 32 is heated via the argon gas heating control unit 36. Argon gas is supplied.

  For this reason, the magnesium 26 accommodated in the metal holding part 30 is supplied with a predetermined amount and a predetermined temperature of argon gas, and the magnesium 26 is evaporated to generate magnesium gas. Then, this magnesium gas is changed into magnesium fine particles and supplied into the cavity 40.

  Thereby, in the cavity 40, magnesium fine particle couple | bonds with oxygen, The effect that it becomes possible to make the inside of this cavity 40 into a low oxygen state, and to prevent the oxidation of molten aluminum effectively is acquired. In addition, the configuration of the entire apparatus can be simplified and miniaturized at a time, and can be applied to various molds 21.

  FIG. 6 is a schematic configuration explanatory diagram of a main part of a casting apparatus 140 according to the fourth embodiment of the present invention.

  The casting apparatus 140 is equipped with the casting mold 142, the metal fine particle generation mechanism 22, the high temperature gas generation mechanism 24, the metal fine particle generation mechanism 22 and the high temperature gas generation mechanism 24, and the mold 142. And a reaction unit 144 directly connected to

The reaction unit 144 is provided with a hole 146a in which the metal holding part 30 constituting the metal fine particle generating mechanism 22 is mounted and a hole 146b in which the cylindrical part 66 forming the high temperature gas generating mechanism 24 is mounted. The holes 146a and 146b are provided relatively close to each other, and the reaction unit 144 reacts magnesium gas and / or magnesium fine particles and nitrogen gas in the reaction chamber 148 to generate Mg ₃ N ₂ fine particles. It has a function to make it.

  The reaction unit 144 can be attached to and detached from the hole 150 side of the mold 142 via the molten metal backflow prevention mechanism 42 and can communicate with the cavity 152 in the mold 142. The metal holding unit 30 may be integrated with the reaction unit 144.

  The operation of the casting apparatus 140 configured as described above will be schematically described below.

  In the metal fine particle generation mechanism 22, a predetermined amount of argon gas is supplied to the cylindrical portion 32 via the argon gas flow rate control unit 34 while the inside of the cylindrical portion 32 is heated via the argon gas heating control unit 36. Is done. For this reason, magnesium 26 accommodated in the metal holding unit 30 reacts to generate magnesium gas, and the magnesium gas is changed into magnesium fine particles and supplied into the reaction chamber 148 of the reaction unit 144.

  On the other hand, in the high temperature gas generation mechanism 24, as in the metal fine particle generation mechanism 22, first, the nitrogen gas heating control unit 70 is driven to heat the inside of the cylindrical portion 66 to a predetermined temperature, and then the nitrogen gas flow rate. The control unit 68 is driven. Accordingly, a predetermined amount of nitrogen gas supplied from the nitrogen gas cylinder 82 to the cylindrical portion 66 is supplied to the reaction chamber 148 after being heated to a desired temperature.

As a result, in the reaction chamber 148, part of the magnesium gas is aggregated and changed into magnesium fine particles, and the magnesium fine particles and / or unreacted magnesium gas reacts with high-temperature nitrogen gas (3Mg + N ₂ → Mg ₃ N ₂ ), Mg ₃ N ₂ fine particles are produced. The Mg ₃ N ₂ fine particles generated in the reaction chamber 148 are directly introduced into the cavity 152 of the mold 142 in which the reaction unit 144 is mounted, through the molten metal backflow prevention mechanism 42.

Next, after the molten metal backflow prevention mechanism 42 is closed, for example, molten aluminum (not shown) is poured into the cavity 152 of the mold 142. At this time, the cavity 152, Mg ₃ N ₂ and fine particles are present, the Mg ₃ N ₂ fine particles are preferentially binds with oxygen in the cavity 152, effectively inhibit the oxidation of the molten aluminum. For this reason, it is possible to maintain the fluidity of the molten aluminum and to perform a good casting operation.

In this case, in the fourth embodiment, magnesium gas and / or magnesium fine particles and nitrogen gas are reacted in advance in the reaction chamber 148 of the reaction unit 144 to generate Mg ₃ N ₂ fine particles, and the desired Mg ₃ N ₂ fine particles can be reliably supplied to the cavity 152 of the mold 142. Therefore, oxidation of the molten aluminum poured into the cavity 152 can be effectively suppressed, and there is an effect that a good casting operation can be performed while maintaining the fluidity of the molten aluminum.

  FIG. 7 is a schematic configuration diagram for explaining a main part of a casting apparatus 160 according to the fifth embodiment of the present invention. In addition, the same referential mark is attached | subjected to the component same as the casting apparatus 140 which concerns on 4th Embodiment, and the detailed description is abbreviate | omitted.

  The casting apparatus 160 includes a reaction unit 162, in which the metal fine particle generation mechanism 22 and the high temperature gas generation mechanism 24 incline the axis of each other by a predetermined angle θ ° (θ ° <90 °). Is installed.

As a result, in the reaction chamber 164 of the reaction unit 162, magnesium gas and / or magnesium fine particles and nitrogen gas react well, and the desired Mg ₃ N ₂ fine particles are easily and reliably produced. .

  In the first to fifth embodiments, argon gas is used as the inert gas and nitrogen gas is used as the reactive gas. However, other inert gases and reactive gases can be used. It is.

It is principal part schematic structure explanatory drawing of the casting apparatus which concerns on the 1st Embodiment of this invention. It is a principal part disassembled perspective explanatory view of a particulate generator. It is principal part schematic structure explanatory drawing of the said casting apparatus of the state with which the elongate magnesium was loaded. It is principal part schematic structure explanatory drawing of the casting apparatus which concerns on the 2nd Embodiment of this invention. It is principal part schematic structure explanatory drawing of the casting apparatus which concerns on the 3rd Embodiment of this invention. It is principal part schematic structure explanatory drawing of the casting apparatus which concerns on the 4th Embodiment of this invention. It is principal part schematic structure explanatory drawing of the casting apparatus which concerns on the 5th Embodiment of this invention. It is schematic structure explanatory drawing of the shaping | molding die for reduction casting based on a prior art.

Explanation of symbols

20, 100, 120, 140, 160 ... casting apparatus 21, 142 ... mold 22 ... metal fine particle generation mechanism 24 ... high temperature gas generation mechanism 26, 26a ... magnesium 28a, 28b ... filter 30 ... metal holding part 32, 66 ... cylinder 34: Argon gas flow controller 36 ... Argon gas heating controller 40, 152 ... Cavity 42 ... Molten backflow prevention mechanism 43 ... Stay 43a, 44a ... Hole 44 ... Slide key 46 ... Cartridge 54, 74 ... Heating wire 56 76 ... Controller 58, 78 ... Power source 62 ... Argon gas cylinder 68 ... Nitrogen gas flow rate control unit 70 ... Nitrogen gas heating control unit 102, 122 ... Active substance generation mechanism 144, 162 ... Reaction unit 148, 164 ... Reaction chamber

Claims (5)

A mold for supplying a molten metal to a cavity to obtain a casting,
A fine particle generation mechanism that is directly connected to the mold and that directly introduces the metal fine particles into the cavity immediately after producing the metal fine particles;
A reactive gas that is directly connected to the mold corresponding to a site different from the fine particle generation mechanism and that reacts with the metal fine particles to generate an active substance that is more active against oxygen than the molten metal, A reactive gas supply mechanism for supplying the cavity;
A casting apparatus comprising: A mold for supplying a molten metal to a cavity to obtain a casting,
A fine particle generation mechanism for generating metal fine particles;
A reactive gas supply mechanism for supplying a reactive gas that reacts with the metal fine particles to generate an active substance that is more active against oxygen than the molten metal;
The active substance is directly connected to the mold, and the active substance is generated immediately after the fine particle generation mechanism and the reactive gas supply mechanism are connected to react the metal fine particles with the reactive gas to generate the active substance. A reaction unit introduced directly into the cavity;
A casting apparatus comprising:   3. The casting apparatus according to claim 1, wherein the molten metal is a molten aluminum, the fine metal particles are magnesium fine particles, the reactive gas is nitrogen gas, and the active substance is magnesium nitride. Casting equipment. A mold for supplying a molten metal to a cavity to obtain a casting,
An active substance generating mechanism that is directly connected to the mold and that directly introduces the active substance into the cavity immediately after generating an active substance that is more active against oxygen than the molten metal;
A casting apparatus comprising:   5. The casting apparatus according to claim 4, wherein the molten metal is a molten aluminum, and the active substance is at least one of magnesium nitride and magnesium fine particles.

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