JP2015030026A - Casting method and casting mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting method capable of properly cooling molten metal.SOLUTION: A casting method, for pouring molten metal into a casting mold 1 configured by filling sand in frames 15 and 19, cools the molten metal in a casting part 11 by supplying gas between sand grains at a lower part, a lateral part, and an upper part of the casting part 11 which is a gap where a casting is formed at these parts.

Description

  The present invention relates to a casting method and a mold.

  In a casting (gravity casting) method in which a molten metal (a molten metal) is poured into a mold, a technique for actively cooling the molten metal poured into the mold is known (for example, Patent Documents 1 and 2). Patent Document 1 discloses a technique for supplying air or a mixed airflow of air and water to a flow path provided in a mold. Patent Document 2 discloses a technique for infiltrating water into sand constituting a mold.

Japanese Examined Patent Publication No. 4-45264 JP-A-9-225621

  However, the technique of Patent Document 1 is for locally cooling a casting (a molten metal to be formed), and does not contribute to the efficiency of casting. Moreover, since patent document 2 permeate | transmits water to sand, a various inconvenience arises. For example, it is difficult to reuse the mold for a long time. Further, since the molten metal is rapidly cooled, cooling can be performed only until just before the A1 transformation temperature in order to suppress the occurrence of casting defects.

  Therefore, it is desirable to provide a casting method and mold that can cool the molten metal suitably.

  A casting method according to an aspect of the present invention is a casting method in which molten metal is poured into a mold configured by filling sand into a frame, and is below, on a side, and above a casting part that is a void in which a casting is formed. The molten metal in the casting is cooled by supplying gas between the sand grains.

  Preferably, the gas is supplied between the sand grains until the temperature of the molten metal reaches a room temperature from a temperature higher than the A1 transformation temperature.

  Preferably, the amount of gas supplied between the sand grains is reduced before the temperature of the molten metal reaches the A1 transformation temperature.

  Preferably, the mold has a pair of plate-like members facing each other with a gap and facing the casting portion side, and at least of the pair of plate-like members on the casting portion side. The plate-like member is in contact with the sand and has a plurality of holes, and gas is supplied between the plurality of holes between the sand particles by supplying gas between the pair of plate-like members. .

  Preferably, the pair of plate-like members are embedded in the sand.

  Preferably, the mold has a tubular member embedded in the sand, and the tubular member has a plurality of holes penetrating from an inner peripheral surface to an outer peripheral surface, and sand particles are formed from the plurality of holes. Gas is supplied between them.

  A casting method according to an aspect of the present invention is a casting method in which a molten metal is poured into a mold configured by filling sand into a frame, and the temperature of the molten metal is increased from a temperature higher than the A1 transformation temperature to normal temperature. Gas is supplied to cool the molten metal in the casting part.

  A mold according to an aspect of the present invention is a frame, sand that forms a casting part that is a gap formed in the frame and in which a casting is formed, and is opposed to each other through a gap, and faces the casting part side. A pair of plate-like members, and among the pair of plate-like members, at least the plate-like member on the casting part side is in contact with the sand and has a plurality of holes formed therein. .

  A mold according to an aspect of the present invention includes a frame, sand that forms a casting portion that is packed in the frame and in which a casting is formed, and is embedded in the sand and penetrates from an inner peripheral surface to an outer peripheral surface. And a tubular member having a plurality of holes formed therein.

  According to the present invention, the molten metal can be suitably cooled.

1 is a schematic cross-sectional view showing a configuration of a mold according to a first embodiment of the present invention. The perspective view which shows the plate-shaped member of the casting_mold | template of FIG. The figure explaining the cooling process in the casting_mold | template of FIG. The typical sectional view showing the composition of the mold concerning the 2nd embodiment of the present invention. The perspective view which shows the tubular member of the casting_mold | template of FIG.

<First Embodiment>
FIG. 1 is a cross-sectional view showing a configuration of a mold 1 according to the first embodiment of the present invention. FIG. 1 is schematic and does not necessarily show the same cross section.

  The mold 1 includes, for example, a lower mold 3, an upper mold 5 disposed on the lower mold 3, a core 7 disposed therebetween, and a sump 9 disposed on the upper mold 5. have. Between these members or between the members, for example, a cast portion 11 which is a void portion in which a casting is formed, and a gate system 13 for guiding the molten metal to the cast portion 11 are configured.

  The mold 1 is a so-called sand mold. That is, the lower mold 3 has a frame 15 and a sand portion 17 disposed in the frame 15. Similarly, the upper mold 5 includes a frame 19 and a sand portion 21 disposed in the frame 19. The core 7 consists of a sand part. The hot water reservoir 9 has a frame 23 and a sand portion 25 disposed in the frame 23.

  The frames 15, 19 and 23 are made of metal or wood, for example. The sand parts 17, 21, and 25 and the core 7 are made of, for example, sand and a binder that binds the sand. The sand is, for example, silica sand. The binder is, for example, clay, resin, or water glass. Although not particularly illustrated, as is well known, in the sand portions 17, 21 and 25 and the core 7, gaps are formed between the sand grains, and gas can flow in.

  The casting part 11 is constituted by a gap surrounded by the sand part 17 of the lower mold 3 and the sand part 21 (and the core 7) of the upper mold 5. In addition, the shape of the casting part 11 may not require the core 7. FIG. 1 schematically shows a cast part 11 having a simple shape in which a recess is formed only in the lower mold 3 and a core 7 is arranged in the recess. Naturally, in each of the lower mold 3, the upper mold 5 and the core 7, a concave portion and / or a convex portion may be appropriately formed according to the specific shape of the actual casting.

  The gate system 13 is configured by, for example, a gap formed in the sand portion 17 and the sand portion 21 and / or a gap between the sand portion 17 and the sand portion 21. In addition, tubular members, such as a ceramic pipe, are to be embed | buried in the sand part 17 or 21, and a part of the gate system 13 may be comprised. The shape of the gate system 13 may be appropriately configured, and FIG. 1 illustrates a so-called push-up system gate system.

  The mold 1 has a plurality of flow paths 27 through which a gas for cooling the molten metal flows. For example, the plurality of flow paths 27 are provided above, below, and laterally (for example, all four sides) with respect to the casting part 11, and a total of six channels 27 are provided. In addition, the some flow path 27 may be connected suitably.

  Each flow path 27 includes, for example, a passage portion 29 that guides gas from the outside of the mold 1 to the inside of the mold 1 (more specifically, the inside of the sand portions 17 and 21), and the guided gas inside the sand portions 17 and 21. And a dispersing portion 31 for dispersing at.

  The passage portion 29 opens to the outside of the mold 1 and extends to the inside of the mold 1 (more specifically, the inside of the sand portions 17 and 21). The passage part 29 may be configured similarly to the gate system 13 or the like. For example, the passage portion 29 may be configured by forming a gap in the sand portions 17 and 21, or may be configured by embedding a tubular member such as a ceramic pipe in the sand portion 17 or 21. . In FIG. 1, the case where the tubular member is comprised by being embed | buried under the sand part 21 is illustrated.

  FIG. 2 is a schematic perspective view showing the configuration of the dispersing unit 31.

  The dispersion part 31 has a first plate-like member 33A and a second plate-like member 33B that are opposed to each other with a gap (hereinafter, simply referred to as “plate-like member 33” without distinguishing both). doing. As shown in FIG. 1, the pair of plate-like members 33 faces the casting portion 11. The first plate member 33A is located on the casting part 11 side, and the second plate member 33B is located on the opposite side to the casting part 11.

  As shown in FIG. 2, a plurality of holes 35 are formed in the first plate-like member 33A. Further, the passage portion 29 communicates the gap between the pair of plate-like members 33 and the outside of the mold 1. Therefore, when gas is supplied to the passage portion 29 from the outside of the mold 1, the gas is sent from the plurality of holes 35 to the casting portion 11 side. The delivered gas flows through the gap between the sand grains of the sand portions 17 and 21. Thereby, the sand parts 17 and 21 are cooled. Further, the gas that has passed through the sand parts 17 and 21 and reached the casting part 11 touches the molten metal to cool the molten metal.

  The shape, area, thickness, distance between the plates, the number of pairs, the arrangement, and the like of the pair of plate members 33 may be set as appropriate. For example, in FIG. 1, six pairs of plate-like members 33 are provided so that a rectangular parallelepiped box surrounding the casting part 11 is generally configured. That is, a pair of plate-like members 33 is constituted by a substantially rectangular plate-like plate-like member 33, and six pairs of plate-like members 33 are arranged in the six directions above, below and four sides of the casting portion 11. They are arranged so as to be substantially orthogonal. Further, the five pairs of plate-like members 33 arranged on the lower side and the four sides are in contact with each other. Further, for example, the five pairs of plate-like members 33 positioned on the lower side and the four sides are provided on the lower die 3, and the upper pair of plate-like members 33 are provided on the upper die 5. In addition, in the upper mold 5, it is possible to provide a plate-like member 33 (flow path 27) on the side of the casting part 11 to further increase the area surrounding the casting part 11.

  The outer peripheries of the pair of plate-like members 33 may be closed by other members, or gas may be supplied to the sand portions 17 and 21 without being closed. Further, when the member is closed by another member, the member may have a plurality of holes for supplying gas to the sand portions 17 and 21. In FIG. 1, the case where it is blocked is illustrated.

  The opening area, shape, number, arrangement range, arrangement method, and the like of the plurality of holes 35 may be set as appropriate. The plurality of holes 35 may have the same opening area, shape, or the like, or may be different from each other. For example, in FIG.1 and FIG.2, the several hole 35 of the same shape is distributed uniformly over the whole 1st plate-shaped member 33A.

  The material of the plate-like member 33 may be any material that is not burned out or melted by heat during casting. For example, the plate-like member 33 is formed of a metal such as steel or a ceramic.

  The connection position between the passage portion 29 and the dispersion portion 31 may be set as appropriate. For example, the passage portion 29 communicates with a gap between the pair of plate-like members 33 through an opening formed in the second plate-like member 33B (a surface of the dispersion portion 31 on the side opposite to the casting portion 11). . This opening may be formed at an appropriate position such as the center of the second plate-shaped member 33B or near the corner. Moreover, the number of the passage parts 29 connected to the one dispersion | distribution part 31 may be set suitably. In FIG. 1, the case where the two channel | path parts 29 are connected per one dispersion | distribution part 31 is illustrated.

  The gas flow in the mold 1 using the passage portion 29 and the dispersion portion 31 may be set as appropriate.

  For example, the gas may be supplied to all the passage portions 29 at a predetermined pressure. In this case, all the dispersion parts 31 send out gas from the plurality of holes 35. The delivered gas passes between (the gaps between) the sand grains of the sand portions 17 and 21 and is discharged to the outside of the mold 1 from the portion where the sand portions 17 and 21 such as the upper surface of the mold 1 are exposed to the outside. In order to suitably discharge gas from the sand portions 17 and 21, openings for exposing the sand portions 17 and 21 may be appropriately formed in the frames 15 and 19.

  Further, for example, gas may be supplied at a predetermined pressure only to some of the passage portions 29 among the plurality of passage portions 29 connected to the respective dispersion portions 31. In this case, basically, all the dispersing portions 31 send gas to the sand portions 17 and 21 as described above. However, the pressure at which gas is delivered to the sand parts 17 and 21 decreases. On the other hand, the gas whose temperature has risen inside the dispersion part 31 can be discharged early from the passage part 29 to which no gas is supplied, and the gas having a lower temperature can be supplied to the sand parts 17 and 21. The discharge passage portion 29 preferably has a smaller cross-sectional area perpendicular to the flow than the supply passage portion 29.

  Further, for example, gas may be supplied to only a part of the plurality of flow paths 27 (passage section 29 and dispersion section 31). In this case, some of the flow paths 27 send gas to the sand portions 17 and 21, and the other flow paths 27 discharge the gas from the sand portions 17 and 21. Thereby, for example, an arbitrary gas flow can be generated in the sand portions 17 and 21.

  The gas may be air or another gas such as an inert gas (such as nitrogen). Moreover, although it is preferable that gas does not contain mist from a viewpoint of avoiding rapid cooling etc., it may contain mist. The means for supplying the gas to the mold 1 (passage 29) may be appropriately configured. For example, in a factory, equipment for sending air for cooling equipment or driving equipment is always available, and this may be used for supplying air to the mold 1. Of course, a pump or the like may be provided only for supplying gas to the mold 1.

  FIG. 3 is a diagram for explaining the procedure of a casting method (cooling step) using the mold 1.

  The horizontal axis represents time, and the vertical axis represents the temperature of the molten metal (casting) and the amount of gas supplied to the flow path 27. A line Lt indicates a change in the temperature of the molten metal during casting, and a line Lw indicates a change in the amount of gas supplied to the flow path 27 during casting. This diagram schematically shows an outline of a change mode (pattern) of the temperature and the supply amount, and the change amount and change rate of the temperature and supply amount shown in the line Lt and the line Lw are not necessarily actual. Does not match.

  First, molten metal is supplied to the mold 1. Then, immediately after the molten metal is supplied to the mold 1 (for example, within 5 minutes from the completion of the molten metal supply), the supply of gas to the flow path 27 is started (time t1). At this time, the gas supply amount is set to a relatively large V1. Therefore, the molten metal is cooled relatively rapidly.

  Next, when the temperature of the molten metal approaches the A1 transformation temperature (A1 in the figure), the gas supply amount is set to V2, which is relatively small. Thereby, the temperature change of a molten metal becomes loose. However, compared with the case where no gas is supplied at all (when the mold 1 is naturally cooled in the atmosphere), the temperature decrease rate of the molten metal is faster.

  Thereafter, the temperature of the molten metal becomes lower than the A1 transformation temperature, and further reaches room temperature RT (normal temperature). The room temperature RT is, for example, a room temperature of 20 ° C. ± 15 ° C. (5 ° C. or more and 35 ° C. or less) defined by Japanese Industrial Standards.

  In addition, after the temperature of a molten metal becomes lower than A1 transformation temperature, as shown by the dotted line Lwm, you may enlarge the supply amount of the gas to the flow path 27 again. In this case, the temperature of the molten metal reaches the room temperature RT sooner.

  The adjustment of the air flow rate according to the temperature of the molten metal as described above may be performed based on the detected temperature by detecting the temperature of the molten metal with a temperature sensor, or based on experiments and experience, It may be performed based on time.

  As described above, in this embodiment, the casting method in which the molten metal is poured into the mold 1 configured by filling the frames 15 and 19 with sand is below, to the side, and above the casting portion 11 that is a void in which the casting is formed. And it has the process of cooling the molten metal in the casting part 11 by supplying gas between sand grains.

  Therefore, the casting (molten metal) can be cooled as a whole, and the casting can be made efficient. Moreover, since it is air cooling, compared with water cooling, for example, reuse of the casting_mold | template 1 is facilitated and it is suppressed that a molten metal is cooled rapidly.

  Since the molten metal is suppressed from being cooled rapidly, for example, in the temperature region below the A1 transformation temperature, it is possible to suppress the occurrence of defective dimensions or deformation or cracking of the casting. That is, cooling can be performed immediately after pouring is completed until the temperature of the molten metal reaches room temperature. In another aspect, the gas supply between the sand grains can be continued until the temperature of the molten metal is changed from a temperature higher than the A1 transformation temperature to a lower temperature. Therefore, it is expected that the entire casting until the casting is taken out from the pouring will be more efficient than water cooling.

  Moreover, in this embodiment, before the temperature of a molten metal reaches | attains A1 transformation temperature, the supply amount of the gas between sand grains is made small.

  Therefore, before the temperature of the molten metal reaches the A1 transformation temperature, the molten metal can be rapidly cooled to increase the efficiency of casting. On the other hand, when the molten metal temperature passes the A1 transformation temperature, It is possible to suppress the occurrence of defects by slowing the cooling rate.

  Moreover, in this embodiment, the casting_mold | template 1 has a pair of plate-shaped member 33 which faces each other via a clearance gap, and faces the casting part 11 side. Of the pair of plate-like members 33, at least the plate-like member 33 on the casting part 11 side is in contact with sand and has a plurality of holes 35. In the cooling step, gas is supplied between the sand grains from the plurality of holes 35 by supplying gas between the pair of plate-like members 33.

  Therefore, gas can be supplied in a wide range to the sand portions 17 and 19 with a simple configuration, and the casting portion 11 can be efficiently cooled as a whole. In addition, since the pair of plate-like members 33 are embedded in the sand, it is expected to contribute to the reinforcement of the sand portions 17 and 19.

  In addition, this inventor implemented the casting method (cooling) of this embodiment in casting of a large sized casting of several dozen tons. Conventionally, in casting of this large casting, the mold is allowed to stand for 2 days (natural cooling) immediately after pouring, and then the upper mold is removed and the casting and the lower mold are allowed to stand for 5 days to bring the casting temperature to room temperature. I was doing. That is, it took 7 days in total from pouring to taking out the casting. However, when the casting method of this embodiment (or the second embodiment described later) was carried out, the period from pouring to removal of the casting could be 4 days or 4 and a half days.

<Second Embodiment>
FIG. 4 is a cross-sectional view similar to FIG. 1 showing the configuration of the mold 201 according to the second embodiment. In the mold 201, the same or similar configuration as the configuration of the mold 1 of the first embodiment may be denoted by the same reference numeral as that of the first embodiment, and description thereof may be omitted.

  As in the first embodiment, the mold 201 is configured to be able to cool the molten metal of the casting portion 11 by supplying gas to the sand portions 17 and 21. However, the configuration of the flow path 227 for that purpose is different from the configuration of the flow path 27 of the first embodiment. Specifically, it is as follows.

  The flow path 227 of the mold 201 is configured, for example, by embedding a tubular member 229 in the sand portions 17 and 21. The cross-sectional shape, cross-sectional area, planar shape, length, thickness, number, arrangement interval, arrangement range, and the like of the tubular member 229 may be appropriately set.

  For example, in FIG. 4, the tubular member 229 has a circular cross section, extends linearly, and has a length extending over the casting portion 11. The plurality of tubular members 229 are provided in six directions (six surfaces) surrounding the casting portion 11. On each surface, the plurality of tubular members 229 are arranged over the entire casting portion 11. That is, the casting part 11 is surrounded by a plurality of tubular members 229.

  The material of the tubular member 229 may be any material that is not burned out or melted by the heat during casting, like the plate-like member 33. For example, the tubular member 229 is made of metal such as steel or ceramic.

  Although not particularly illustrated, the inside of the tubular member 229 communicates with the outside of the mold 201, and gas can be supplied from the outside of the mold 201. For example, one end or both ends of the tubular member 229 protrude from the frames 15 and 19.

  The plurality of tubular members 229 (the plurality of flow paths 227) may be communicated with each other. For example, the ends of the plurality of tubular members 229 may be alternately communicated to form a zigzag flow path, or one or both ends may be sequentially communicated to form a manifold-shaped flow path. In this case, only a part of the plurality of tubular members 229 needs to communicate directly with the outside of the mold 1.

  FIG. 5 is a schematic perspective view showing the tubular member 229.

  The tubular member 229 is formed with a plurality of holes 235 penetrating from the inner peripheral surface to the outer peripheral surface. Therefore, when a gas is supplied to the tubular member 229, the gas is sent out from the plurality of holes 235. Thereby, gas can be supplied between the sand grains of the sand portions 17 and 21 as in the first embodiment.

  The opening area, shape, number, arrangement range, arrangement method, and the like of the plurality of holes 235 may be set as appropriate. For example, FIG. 5 illustrates a case where the plurality of holes 235 are provided in one row along the longitudinal direction of the tubular member 229 on the casting part 11 side.

  The gas flow in the flow path 227 (tubular member 229) may be set appropriately as in the first embodiment. For example, the tubular member 229 may be supplied with gas from the other end with one end closed, or supplied with gas from both ends, and only supplied with gas. Further, for example, the tubular member 229 may be supplied with gas from one end and discharge the gas heated by the tubular member 229 from the other end. Further, for example, some of the plurality of tubular members 229 may be used for supplying gas, and others for discharging gas.

  The procedure of the casting method (cooling step) may also be the procedure described with reference to FIG. 3 as in the first embodiment.

  As described above, the casting method of the present embodiment also supplies gas between the sand grains below, on the side, and above the casting portion 11 that is a gap in which the casting is formed, as in the first embodiment. The process which cools the molten metal in the casting part 11 by this. Accordingly, as in the first embodiment, effects such as improved casting efficiency, easy reuse of the mold 201, and suppression of rapid quenching of the molten metal are exhibited.

  Moreover, in this embodiment, the casting_mold | template 201 has the tubular member 229 embed | buried under sand. The tubular member 229 is formed with a plurality of holes 235 penetrating from the inner peripheral surface to the outer peripheral surface. In the cooling step, gas is supplied from the plurality of holes 235 between the sand grains.

  Therefore, similarly to the case where the plate-shaped member 33 is provided, gas can be supplied in a wide range to the sand portions 17 and 19 with a simple configuration, and the casting portion 11 can be efficiently cooled as a whole. Can do. It is also expected that the sand portions 17 and 19 are reinforced by the pair of tubular members 229.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The overall configuration of the mold shown in FIG. 1 is merely an example. The shape of the casting part and the shape of the gate system, and the division of roles of the lower mold, the upper mold and the core related to the formation thereof may be appropriately changed. For example, a receiving port may be provided instead of the hot water reservoir. A parting line gate may be employed instead of the boost gate. A hot water may be provided.

  The molten metal may be a metal (for example, pure iron) whose A1 transformation temperature is not defined.

  The supply amount of gas may be constant from the start of supply to the stop of supply. When the supply amount is changed, the change may be stepped as in the embodiment or may be asymptotic.

  Further, the present invention makes it possible to continue cooling the molten metal even when the temperature of the molten metal is near the A1 transformation temperature. However, the gas supply is stopped before the molten metal reaches the A1 transformation temperature. Also good. In this case, after the temperature of the molten metal is lower than the A1 transformation temperature, the gas supply may be started again or may not be started again.

  The flow path for supplying gas between the sand grains above, on the side and below the casting part may be appropriately configured, and is not limited to the one configured by embedding a plate-like member or a tubular member in the sand. For example, as in the case of the gate system, the gap may be formed only in the sand portion as a flow path communicating with the outside of the mold. Since the inner peripheral surface of the flow path is made of sand, if gas is supplied to the flow path, the gas is naturally supplied between the sand grains.

  However, if a plate-like member or a tubular member is arranged as in the present embodiment, various effects are achieved.

  For example, the flow path can be formed over a wide range surrounding the casting portion without impairing the strength of the sand portion. For example, it is difficult to form a box-shaped gap surrounding the casting part as in the first embodiment without embedding the plate-like member from the viewpoint of securing the strength of the sand part.

  Further, for example, by changing the sizes of the plurality of holes formed in the plate-like member or the tubular member, or changing the density of the distribution of the plurality of holes, the inflow side and the outflow side in the flow path Regardless of the pressure difference (for example, the pressure difference between both ends of the tubular member), the gas is supplied uniformly between the sand grains over a wide range, or conversely, the cooling rate is changed according to the shape of the casting part. can do.

  The pair of plate-like members may not be embedded in the sand but may also be used as a frame. However, as long as it is embedded in sand, the design of the frame is not changed, and it is easily realized. Further, in the pair of plate-like members embedded in the sand, a plurality of holes may be provided in the plate-like member on the side opposite to the casting part. The plate-like member is not limited to a flat plate shape, and may be a curved shape. The plurality of holes of the plate-like member may be closed with a net that prevents sand from entering.

  The tubular member may be formed with a plurality of holes not only on the casting part side but also on the opposite side of the casting part and in other directions. Further, the tubular member is not limited to one extending linearly, and may be bent appropriately.

  The first embodiment and the second embodiment may be appropriately combined. For example, a tubular member may be provided at a portion that is particularly desired to be cooled while the plate-like member is provided so as to surround the casting portion to cool the casting portion as a whole. Further, the plate-like member and the tubular member need not be provided in six directions with respect to the casting part.

  DESCRIPTION OF SYMBOLS 1 ... Mold, 11 ... Casting part, 15 ... Frame, 17 ... Sand part, 19 ... Frame, 21 ... Sand part.

Claims (9)

A casting method in which molten metal is poured into a mold configured by filling sand into a frame,
A casting method in which the molten metal in the casting part is cooled by supplying a gas between sand grains below, on the side and above the casting part which is a void in which the casting is formed. The casting method according to claim 1, wherein the gas is supplied between the sand grains until the temperature of the molten metal reaches a room temperature from a temperature higher than the A1 transformation temperature. The casting method according to claim 2, wherein the gas supply amount between the sand grains is reduced before the temperature of the molten metal reaches the A1 transformation temperature. The mold has a pair of plate-like members facing each other with a gap and facing the casting part side,
Of the pair of plate-like members, at least the plate-like member on the casting part side is in contact with the sand and has a plurality of holes formed therein.
The casting method according to any one of claims 1 to 3, wherein gas is supplied between the plurality of holes by supplying gas between the pair of plate-like members. The casting method according to claim 4, wherein the pair of plate-like members are embedded in the sand. The mold has a tubular member embedded in the sand,
The tubular member is formed with a plurality of holes penetrating from the inner peripheral surface to the outer peripheral surface,
The casting method according to any one of claims 1 to 5, wherein gas is supplied between sand grains from the plurality of holes. A casting method in which molten metal is poured into a mold configured by filling sand into a frame,
A casting method in which a gas is supplied between sand grains until the temperature of the molten metal is higher than the A1 transformation temperature to room temperature to cool the molten metal in the casting part. Frame,
Sand that forms a casting part that is a gap formed in the frame and in which a casting is formed, and
A pair of plate-like members facing each other through a gap and facing the casting part side;
Have
Of the pair of plate-like members, at least the plate-like member on the casting part side is in contact with the sand and has a plurality of holes formed therein. Frame,
Sand that forms a casting part that is a gap formed in the frame and in which a casting is formed, and
A tubular member embedded in the sand and formed with a plurality of holes penetrating from the inner peripheral surface to the outer peripheral surface;
Having a mold.

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