JP2009050917A - Gypsum mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gypsum mold in which air permeability and drying ability during the manufacture of a mold are improved while maintaining cost merit of the gypsum mold. <P>SOLUTION: A mold 1 is provided with: a casting cavity 3, which is a hollow part for casting a cast product and is dividedly prepared; a mold main body 2, which is composed of a cavity division wall 4 formed around the casting cavity 3 with a predetermined thickness so that it shapes like the casting cavity 3, a mold outer wall 5 having a predetermined thickness which is prepared in a line with the cavity division wall 4 and forms an outer shell for the mold 1, and a mold hollow part 6 which is a space prepared between the mold outer wall 5 and the cavity division wall 4; and a mold reinforced body 8, which becomes stronger than the mold main body 2 by the solidification of filling material filled inside the mold hollow part 6 in the mold main body 2 to be integrated into the mold main body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gypsum mold that can reduce energy cost and material cost as compared with a ceramic mold, and is excellent in air permeability and drying at the time of mold production as compared with a mold.

The mold is a kind of so-called mold, and various types such as a ceramic mold and a plaster mold have been proposed. Here, the ceramic mold as the material is more expensive than the gypsum powder as the material of the gypsum mold, and the heating temperature for sintering the mold needs to be set to a very high value of about 1500 ° C. was there. In contrast, gypsum molds are less expensive than ceramic molds, and the heating temperature during production is very low at around 200 ° C., greatly increasing energy consumption costs during production. It could be reduced.
JP 2006-247691 A

  However, although gypsum molds have advantages in terms of material cost and energy consumption cost compared to ceramic molds, when they are formed thick, their breathability is low, so molten metal (molten metal) is poured. In this case, there is a problem that the gas generated in this case is not easily diffused out of the casting cavity, and a bubble nest is easily generated in the casting product.

  Moreover, since the gypsum mold material is a gypsum-based material, there is a problem that the dryness of the thick part is particularly bad and a long time is required for the drying process. In addition, if pouring into a gypsum mold that is insufficiently dried during mold production, there is a risk of a steam explosion during the pouring, and therefore a sufficient drying process is indispensable in producing the gypsum mold.

  The present invention has been made to solve the above-described problems, and can further improve the air permeability and the drying property during mold production while maintaining the cost advantage of the gypsum mold. The purpose is to provide a plaster mold.

  In order to achieve this object, the gypsum mold according to claim 1 has a casting cavity, which is a cavity for casting a cast product, provided in the interior thereof, and is shaped like the shape of the casting cavity. And a mold body having a cavity partition wall formed with a predetermined thickness around the casting cavity.

  According to the plaster mold of the first aspect, since the thickness of the cavity partition wall surrounding the casting cavity is formed to be thin, high air permeability is ensured. As a result, the reaction gas generated in the casting cavity at the time of pouring is quickly emitted out of the casting cavity through the cavity partition wall, and the occurrence of bubble voids in the cast product is also suppressed.

  Moreover, since the cavity partition wall of the mold body is formed in a thin shape, the drying property is improved compared to the conventional gypsum mold, and it can be sufficiently dried in a short time, and further, the drying temperature is low. Therefore, the danger of steam explosion during pouring can be easily avoided.

  Furthermore, since the cavity partition wall is formed in a thin wall shape, the amount of material used for the mold body can be reduced and consumed to dry the mold body compared to the conventional gypsum mold described above. Heating energy can be reduced. In addition, since it is a gypsum mold, material costs and energy consumption costs can be reduced compared to the production of ceramic molds.

  A gypsum mold according to claim 2 is the gypsum mold according to claim 1, wherein the gypsum mold according to claim 1 is formed integrally with the mold body around the casting cavity with the cavity partition wall therebetween, and has a higher strength than the mold body. A mold reinforcement body is provided.

  According to the gypsum mold of this second aspect, it operates in the same manner as the gypsum mold of the first aspect, and even if the cavity partition wall of the mold body is formed thin, it is cast by the mold reinforcement integrated with the mold body. Since the periphery of the cavity is reinforced, the mold body is prevented from being destroyed during pouring. Moreover, although it is a gypsum mold, the mold main body is integrally reinforced with the mold reinforcing body, so that the durability strength can be greatly increased as compared with the conventional gypsum mold.

  The gypsum mold according to claim 3 is the gypsum mold according to claim 1 or 2, wherein the mold reinforcement is cured to be integrated with the mold main body so as to have higher strength than the mold main body. A modeling sand such as self-hardening foundry sand.

  According to the gypsum mold of claim 3, it acts in the same manner as the gypsum mold of claim 1 or 2, and in the case of resin-coated sand particles such as RCS (Resin-Coated-Sand), Is bonded and cured to be integrated with the mold body. On the other hand, in the case of self-hardening foundry sand such as self-hardening kneaded sand, the molding sand is hardened by a chemical reaction and integrated with the mold body.

  In this way, the mold reinforcement body that reinforces the mold body uses inexpensive molding sand such as resin-coated sand grains and self-hardening foundry sand. Compared to a ceramic mold manufactured with expensive ceramics, the mold can be manufactured at a very low cost.

  A gypsum mold according to claim 4 is the gypsum mold according to any one of claims 1 to 3, wherein the mold body is manufactured by a rapid-prototyping method.

  According to this gypsum mold of claim 4, since it operates in the same manner as the gypsum mold of any of claims 1 to 3, the mold body is manufactured by the rapid prototyping method, so that the shape and structure of the mold body are complicated. Even so, it can be easily modeled by using a rapid prototyping modeling apparatus.

  For example, three-dimensional data of a mold body is created by a computer from three-dimensional data of a master model of a casting product, and slice data obtained by dividing the three-dimensional data of the mold body into slices at intervals suitable for manufacturing the mold body. The gypsum-based powder is solidified by a rapid prototyping modeling apparatus to which the slice data is input, and the mold body is modeled.

  Moreover, since the cavity wall of the mold body is formed in a thin shape, the amount of gypsum powder used can be reduced compared to the case of manufacturing a conventional ceramic mold or gypsum mold by a rapid prototyping method. The cost required for mold production can be greatly reduced.

  According to the gypsum mold of the present invention, the energy cost and the material cost can be reduced compared with the conventional ceramic mold, and there is an effect that the air permeability and the drying property at the time of mold production can be improved as compared with the conventional gypsum mold. .

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a mold main body 2 used for a mold 1 which is an embodiment of a gypsum mold of the present invention. FIG. 2 is a side view of the mold main body 2 and is a partial cross-sectional view. FIG. 3 is a longitudinal sectional view taken along line III-III in FIG.

  As shown in FIGS. 1 to 3, the mold body 2 has a hollow casting cavity 3 defined therein. The casting cavity 3 mainly includes four cavities: a product cavity 3a for casting a cast product, a gate 3b, a runner 3c, and a feeder 3d, of which a gate 3b and a feeder 3d are provided. Is formed in the upper surface of the mold body 2. Further, the gate 3b is formed to communicate with the lower side surface of the product cavity 3a through the runner 3c, and the feeder 3d is formed to communicate with the upper part of the product cavity 3a.

  The casting cavity 3 configured in this manner is formed by being surrounded by a cavity partition wall 4 that is shaped like the casting cavity 3, and the cavity partition wall 4 includes an upper surface portion and a side surface portion of the mold body 2. Are integrally formed with a mold outer wall 5 which is an outer shell. The cavity partition wall 4 and the mold outer wall 5 are both formed in a thin shape having a predetermined thickness. For example, the thickness is preferably about 2 mm to 5 mm.

  The thicknesses of the cavity partition wall 4 and the mold outer wall 5 can be changed as appropriate according to the shape of the mold body 2 and the type of molten metal. For example, if the thickness of the cavity partition wall 4 and the outer mold wall 5 is in the range of at least about 1 mm to 10 mm, it is presumed that the effects of the present invention are sufficiently exhibited without departing from the spirit of the present invention.

  Further, the entire lower surface of the mold body 2 is open, and the mold hollow portion 6 provided in the mold body 2 communicates with the outside of the mold body 2 through the open portion. The mold hollow portion 6 is a space provided between the cavity partition wall 4 and the mold outer wall 5 and is used to reinforce the mold body 2 by being filled and filled with a filler to be described later.

  Further, referring to the material of the mold body 2, the mold body 2 is made by using rapid prototyping (hereinafter referred to as “gypsum-based powder”) using powder of a material mainly composed of a gypsum-based material (hereinafter “gypsum-based powder”). RP "is also abbreviated.) Manufactured by the method. This gypsum-based powder is relatively inexpensive as compared with ceramic-based powder used for manufacturing a ceramic mold, and greatly contributes to a reduction in material cost in mold manufacturing.

  Further, the mold body 2 has a shell-like shape that is hollowed like the casting cavity 3 and the mold hollow portion 6 except for the cavity partition wall 4 and the mold outer wall 5, and is used for manufacturing the mold body 2. The amount of material used can be greatly reduced. For this reason, the material cost can be greatly reduced as compared with a conventional gypsum mold, that is, a thick gypsum mold in which a material excluding the casting cavity 3 is filled.

  Here, the RP method will be described. The RP method is a kind of modeling method also called additive manufacturing method. From the three-dimensional data (for example, three-dimensional CAD data) on the shape and dimensions of the mold body 2, a three-dimensional solid called slice data is obtained from the mold body 2. In this method, data divided into round slices is obtained by numerical calculation, an actual material is formed into a shape based on the slice data, and these are sequentially stacked to form an actual three-dimensional shape of the mold body 2.

  In addition, various RP methods have been proposed depending on specific modeling methods. For example, an optical modeling method, a powder sintering method, an ink jet method, a sheet lamination method, or an extrusion method can be used. In this embodiment, the mold body 2 is manufactured by an additive manufacturing apparatus (hereinafter also simply referred to as “RP forming apparatus”) using an inkjet RP method.

  In this inkjet type RP modeling apparatus, a layer of powder material corresponding to slice data is laid in a modeling area by a roller, and when the print head passes through the modeling area, an inkjet method is used based on the slice data. By discharging the adhesive, the shape of the layer is formed of a powder material, and this is sequentially repeated to form the actual three-dimensional shape of the mold body 2.

  According to the present embodiment, a 3D printer (trade name: Spectrum Z510-3DPrinter) manufactured by Z Corp. in the United States is used as an inkjet type RP modeling apparatus, and a mold body 2 is manufactured using a gypsum powder as a powder material. As a result, it was confirmed that a cast product of good quality can be cast by the mold 1 using the mold body 2.

  4 to 6 are actual photographs (drawing substitute photographs) of the mold body 2 actually formed by the RP forming apparatus, and FIG. 4 is a plan view of the mold body 2 taken from the upper surface side. FIG. 6 is a bottom view obtained by photographing the mold body 2 from the lower surface side, and FIG. 6 is a bottom view obtained by photographing the mold body 2 from the lower surface side although the photographing direction is slightly different from that in FIG.

  As shown in FIG. 4, the upper surface of the mold body 2 is formed with an opening 3b and a feeder 3d as described above, and the structure inside the casting cavity 3 appears through the opening of the feeder 3d. ing. Further, as shown in FIGS. 5 and 6, a cavity partition wall 4 is formed around the casting cavity 3 on the inner peripheral portion of the mold outer wall 5, and the cavity partition wall 4 and the mold outer wall 5 are connected to each other. A mold hollow portion 6 is provided therebetween. Further, a plate-like or bar-like reinforcing stay 7 for reinforcing the mold body 2 is integrally installed between the cavity partition wall 4 and the mold outer wall 5 in the mold hollow portion 6.

  FIG. 7 is a longitudinal sectional view of a mold 1 manufactured using the mold body 2 shown in FIG. As shown in FIG. 7, the casting mold 1 using the casting mold body 2 is filled with molding sand as a filling material in the casting mold hollow portion 6 of the casting mold body 2 without any gaps. A mold reinforcing body 8 that is integrated with the mold body 2 is formed, and the durability of the mold is reinforced by the mold reinforcing body 8. RCS that is relatively inexpensive compared to the gypsum-based material that is the material of the mold main body 2 is used for the modeling sand that forms the mold reinforcing body 8.

  The mold reinforcing body 8 is formed by heating the mold body 2 filled with RCS, which is a type of modeling sand, in the mold hollow portion 6 at a heating temperature of about 150 ° C. to about 200 ° C. for about several tens of minutes. RCS is bonded and cured in the hollow portion 6, and this RCS bonded cured product exhibits higher durability than the gypsum-based material that is the main component of the mold body 2.

  The gypsum-based powder that is the material of the mold body 2 is approximately 150 ° C., which is the heating temperature for bonding and hardening the RCS, compared to the ceramic-based powder that needs to be heated at approximately 1500 ° C. for sintering. It can be dried at a temperature of about ˜200 ° C., and greatly contributes to the reduction of energy consumption cost in mold production.

  Next, an example of a modeling method for the mold 1 of this embodiment will be described. First, three-dimensional CAD data relating to the shape and dimensions of the casting product is produced from a design drawing of the casting product by an electronic computer such as a computer. Then, the three-dimensional CAD data is imaged and displayed on a display device such as a display to confirm the shape of the cast product.

  If it is difficult to confirm the shape of the cast product from the image of the 3D CAD data, the 3D CAD data of the cast product is input to the RP modeling device, and the master model of the cast product is manufactured by this RP modeling device. The shape of the casting product that is the final product may be confirmed using this master model.

  As a result of confirming the three-dimensional CAD data (hereinafter referred to as “master model data”) of the casting product, if the master model data is appropriate, the three-dimensional CAD data ( (Hereinafter referred to as “reversed model data”) is produced by an electronic computer. Then, by inputting the inverted model data to the RP modeling apparatus, the actual mold body 2 is manufactured by the RP modeling apparatus based on the inverted model data.

  After the mold body 2 is manufactured, the RCS is poured into the mold hollow part 6 from the opening of the lower surface part of the mold body 2, and the mold body 2 is shaken to fill the mold hollow part 6 with the RCS without any gap. Then, the mold body 2 filled with RCS is heated in a heating device at a temperature of about 150 ° C. to 200 ° C. for several tens of minutes (about 20 minutes to about 30 minutes for the small mold 1), The mold body 2 is dried and the RCS is bonded and cured, and the mold 1 in which the mold reinforcement 8 is integrally formed in the mold hollow portion 6 is completed.

  When a cast product was cast using the completed mold 1, specifically, a molten metal obtained by melting the aluminum alloy AC4C at 700 ° C. was poured from the gate 3 b of the mold 1 through the runner 3 c and then cooled for a predetermined time. Then, when the mold 1 was broken and the cast product was taken out, a cast product with good quality could be produced.

  The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be easily made without departing from the spirit of the present invention. It can be guessed.

  For example, a partial space in the mold hollow portion 6 adjacent to a location where a sinkhole is likely to occur in the casting cavity 3 is isolated from the other space by the local partition wall, and the partial space is isolated by the local partition wall. Fill the molding space with high cooling properties (for example, RCS based on zircon sand) and fill the other space with modeling sand with high heat retention (RCS based on dredged sand) to reduce the solidification time of the melt locally. It is also possible to make adjustments. In such a case, the local partition wall may be integrally formed as a part of the mold body 2 together with the cavity partition wall 4 and the mold outer wall 5.

  Further, in the state in which the chiller (cooling gold) is applied to the cavity partition wall 4 adjacent to the portion where the sinkhole is likely to be generated in the casting cavity 3, the molding hollow portion 6 is filled with molding sand and hardened. Also good. Further, the material of the mold body 2 is not necessarily limited to the gypsum-based powder, and may be, for example, a ceramic-based material or a metal material, or using these powders by an RP modeling apparatus. The mold body 2 may be shaped.

  Moreover, although the present Example demonstrated using RCS as modeling sand which forms the mold reinforcement body 8, the kind of modeling sand is not necessarily limited to this, For example, self-hardness, such as self-hardening kneading sand. The casting hollow portion 6 may be filled and hardened for use, or the normal casting sand may be filled into the casting mold hollow portion 6 and hardened for use.

  Further, in the present embodiment, the description has been given mainly using the modeling sand as the filler for forming the mold reinforcing body 8, but the filler for forming the mold reinforcing body 8 is not necessarily limited to the modeling sand, For example, a material having fluidity and a property of being chemically or physically cured (hereinafter referred to as “fluid curable material”) may be used.

  In the present embodiment, the mold 1 for casting a relatively small casting product has been described. However, the mold 1 of the present embodiment may be applied to a part of the mold for casting the cast product. For example, out of a large mold for casting a relatively large casting product, a partial mold to which the mold 1 of this embodiment is applied for a complicated shape portion or a pouring method countermeasure portion is manufactured, and this partial mold is incorporated into the large mold. Anyway.

  Then, since the partial mold to which the mold 1 of this embodiment is applied can be manufactured at low cost by the RP method, the model manufacturing cost can be reduced for the complicated shape part and the pouring method countermeasure part, and a high-quality casting product is manufactured. It can be done.

  Below, the modification of this invention is shown.

  As described above, the mold of the present invention is a mold for casting a cast product. However, the gist of the present invention is not necessarily limited to the mold, and the present invention is not limited to other molds. Of course, it can be inferred that it can be widely applied to molds. That is, in addition to casting, the present invention can be applied to a mold for a product using a fluid curable material such as resin, glass, or rubber.

  For example, when the present invention is applied to all types of molds including molds, such molds have a molding cavity that is a cavity for molding a molded product, A cavity partition wall formed with a predetermined thickness around the molding cavity so as to represent the shape of the molding cavity, a mold outer wall with a predetermined thickness that is connected to the cavity partition wall and forms an outer shell of the mold, and the mold outer wall; The mold main body having a mold hollow portion which is a space provided between the cavity partition walls and the filler filled in the mold hollow portion in the mold main body are solidified, thereby providing higher strength than the mold main body. And a die reinforcement body integrated with the die body.

  The mold includes a local partition that locally separates an arbitrary partial space adjacent to the cavity partition in the mold hollow portion from the other space in the mold hollow portion, and the mold reinforcing body is It is good also as what is formed with a different filler in the said partial space and the said other part space which are isolated by the said local partition. The mold may be formed of a material whose main component is a gypsum-based material. Further, the mold is filled with resin in the mold hollow portion as a filler for forming the mold reinforcement, and is cured with a resin coating that is integrated with the mold body and has higher strength than the mold body. You may use modeling sand, such as a sand grain and self-hardening foundry sand. Further, in the mold, the mold body may be manufactured by an RP method.

  Furthermore, the modified example of the casting_mold | template of this invention is shown below.

  First, in order to achieve the above-described object of the present invention, the casting mold of the first modified example has a casting cavity that is a cavity for casting a casting product, and is formed therein. A cavity partition wall formed in a predetermined thickness around the casting cavity so as to have a shape of the mold, a mold outer wall of a predetermined thickness connected to the cavity partition wall to form an outer shell of the mold, the mold outer wall, and the cavity partition wall A mold body having a mold hollow portion which is a space provided between the mold body and a filler filled in the mold hollow portion in the mold body is solidified, so that the mold has higher strength than the mold body. A mold reinforcement body integrated with the main body is provided.

  According to the mold of the first modified example, a casting cavity is defined by a cavity partition wall having a predetermined thickness inside the mold body, and a mold reinforcing body is provided around the casting cavity with the cavity partition wall therebetween. It is formed integrally with the mold body. Here, the mold reinforcing body is formed by filling a mold hollow portion, which is a space provided between the cavity partition wall and the mold outer wall, and solidifying the filler.

  In addition, as a method of manufacturing the mold according to the first modification, for example, after the mold body is manufactured, the mold hollow portion of the mold body is filled with a filler and solidified, so that the mold body and the mold reinforcing body are separated. Integrated. By adopting such a structure, the thickness of the cavity partition wall surrounding the casting cavity can be formed thin, and high air permeability is ensured. As a result, the gas generated in the casting cavity during pouring can be quickly diffused out of the casting cavity through the cavity partition wall.

  In addition, the mold body has a mold hollow portion between the cavity partition wall and the mold outer wall, and the cavity partition wall and the mold outer wall can be formed thin. For this reason, compared with the conventional mold in which the portion excluding the casting cavity is solid, the drying property is improved and can be sufficiently dried in a short time. Moreover, since it has such a structure, the amount of material used for the mold body can be reduced and the heating energy consumed to dry the mold body can be reduced as compared with the conventional mold described above.

  In addition, even if the cavity partition wall and the outer wall of the mold body are formed thin, the periphery of the casting cavity is reinforced by the mold reinforcement formed in the mold hollow portion, preventing the mold from being destroyed during pouring. Is done.

  The mold according to the second modification is the mold according to the first modification. In the mold body, the mold main body allows any part of the mold hollow portion adjacent to the cavity partition wall to be separated from the other space in the mold hollow portion. A local partition wall that is locally isolated is provided, and the mold reinforcing body has different fillers in the partial space and the other space that are isolated by the local partition wall.

  According to the mold of the second modification example, the mold operates in the same manner as the mold of the first modification example, and, for example, the inside of the mold hollow portion is partially partitioned by the local partition walls. At this time, in the casting cavity, a part of the space in the mold hollow portion adjacent to the cavity partition wall is separated from the other part space by the local partition wall at a position where a sink cavity is easily formed. And one of the partial space or other part space is separated and filled with modeling sand having high cooling property and molding sand having high heat retaining property is separated into the other side.

  In other words, when molten metal is poured into the casting cavity, the solidification time of the molten metal can be shortened at the portion in the casting cavity adjacent to the filling portion of the molding sand with high cooling properties, and modeling with high heat retention. It can be extended for a long time at the site in the modeling cavity adjacent to the sand filling. As a result, since the solidification time of the molten metal in the casting cavity is locally adjusted, it is possible to prevent the formation of a sinkhole locally in the cast product.

  The mold according to the third modification is the mold according to the first or second modification, in which the mold body is formed of a material mainly composed of a gypsum-based material.

  According to the mold of the third modified example, in addition to acting in the same manner as the mold of the first or second modified example, the mold body is formed of a material mainly composed of a gypsum-based material. Compared with manufacturing, material costs and energy consumption costs can be reduced. In addition, since the mold body is reinforced by being integrated with the mold reinforcing body even if the main component is a gypsum-based material, the durability can be greatly increased as compared with the gypsum mold.

  In addition, because the cavity partition of the mold body is made thin, high air permeability can be secured, so that the reaction gas generated when pouring the molten metal can be quickly emitted out of the casting cavity, creating bubble cavities in the cast product. It can also be suppressed. Furthermore, by forming the cavity partition walls and the outer wall of the mold in a thin shape, high drying characteristics can be secured, so that the drying time can be shortened and the drying temperature can be lowered, and the danger of steam explosion during pouring can be avoided easily. it can.

  The mold according to the fourth modified example is the mold according to any one of the first to third modified examples, wherein the filler forming the mold reinforcing body is filled in the mold hollow portion and cured, so that the mold main body It is modeling sand such as resin-coated sand grains and self-hardening foundry sand that are integrated and have higher strength than the mold body.

  According to the mold of the fourth modified example, in addition to acting in the same manner as any of the molds of the first to third modified examples, in the case of resin-coated sand particles such as RCS (Resin-Coated-Sand), the mold hollow portion By being heated after being filled, the particles of the molding sand are bonded and cured to be integrated with the mold body. On the other hand, in the case of self-hardening foundry sand such as self-hardening kneaded sand, a chemical reaction occurs after the hollow portion of the mold is filled, and the modeling sand is hardened and integrated with the mold body.

  In this way, as the filler forming the mold reinforcing body, inexpensive resin-coated sand grains or molding sand such as self-hardening cast sand is used, so the space corresponding to the mold hollow portion is mainly composed of gypsum-based material. Compared to the case of manufacturing a conventional gypsum mold filled with a material to be manufactured or the case of manufacturing a ceramic mold, the mold can be manufactured at a very low cost.

  The mold according to the fifth modification is the mold according to any one of the first to fourth modifications, and the mold body is manufactured by a rapid-prototyping method.

  According to the mold of the fifth modification, the mold body operates in the same manner as any of the molds of the first to fourth modifications, and the mold body is manufactured by the rapid prototyping method. Even if it is complicated, it can be modeled easily by using a rapid prototyping modeling apparatus.

  For example, three-dimensional data of a mold body is created by a computer from three-dimensional data of a master model of a casting product, and slice data obtained by dividing the three-dimensional data of the mold body into slices at intervals suitable for manufacturing the mold body. Then, the rapid prototyping modeling apparatus into which the slice data is input, the powder material is hardened in a laminated form, and the mold body is modeled.

  In addition, since there is a space called the mold hollow part inside the mold body, the amount of powder material used can be reduced compared to the case of producing a conventional ceramic mold or plaster mold by the rapid prototyping method. Therefore, the cost required for mold production can be greatly reduced.

It is a top view of the casting_mold | template main body used for the casting_mold | template which is one Example of this invention. FIG. 3 is a side view of the mold body and is a partial cross-sectional view. It is a longitudinal cross-sectional view in the III-III line of FIG. It is the top view (photograph) which image | photographed the casting_mold | template main body from the upper surface side. It is the bottom view (photograph) which image | photographed the casting_mold | template main body from the lower surface side. It is the bottom view (photograph) which image | photographed the casting_mold | template main body from the lower surface side. It is a longitudinal cross-sectional view of the casting_mold | template manufactured using the casting_mold | template main body shown in FIG.

Explanation of symbols

1 Mold (gypsum mold, mold, mold)
2 Mold body (mold body, mold body)
3 Casting cavity (casting cavity, molding cavity)
4 Cavity partition wall 5 Mold outer wall 6 Mold hollow 7 Reinforcement stay 8 Mold reinforcement (mold reinforcement, mold reinforcement)

Claims (4)

In a gypsum mold in which a casting cavity, which is a cavity for casting a cast product, is provided,
A gypsum mold having a mold body having a cavity partition wall formed with a predetermined thickness around the casting cavity so as to emulate the shape of the casting cavity.   2. A mold reinforcement body is formed around the casting cavity so as to be integrated with the mold main body with the cavity partition wall therebetween, and has a higher strength than the mold main body. The gypsum mold described.   2. The mold reinforcing body is molded sand such as resin-coated sand grains or self-hardening foundry sand which is integrated with the mold body and becomes stronger than the mold body by being cured. Or the gypsum mold of 2.   The gypsum mold according to any one of claims 1 to 3, wherein the mold body is manufactured by a rapid-prototyping method.