JP5937889B2 - Mold manufacturing apparatus, mold manufacturing method, and mold manufacturing apparatus jacket - Google Patents

Description

  The present invention relates to a mold manufacturing apparatus, a mold manufacturing method, and a mold manufacturing apparatus jacket.

  Currently, a mold manufacturing apparatus is provided in accordance with a mold manufacturing method such as a self-hardening mold, a shell mold mold, or an investment mold mold. In a mold manufacturing apparatus using a coated sand coated with a fireproof aggregate with a water-soluble binder, a manufacturing apparatus is provided in which the coated sand is heated and solidified and cured by blowing water vapor into the coated sand filled in the mold. Yes.

  As a mold manufacturing apparatus using such coated sand, there is a mold manufacturing apparatus shown in FIG. 8 (refer to Japanese Patent Laid-Open No. 2009-90334) and a mold manufacturing apparatus shown in FIG. 9 (refer to Japanese Patent Laid-Open No. 2009-244104). It is known.

  The mold manufacturing apparatus shown in FIG. 8 includes a mold 103 having a cavity 103 that can be filled with coated sand, an injection path 104 that is provided in the upper part and communicates with the cavity 103, and a discharge path 106 that is provided in the lower part and communicates with the cavity 103. I have. A net 105 such as a wire net is disposed in the discharge path 106. In addition, the mold manufacturing apparatus includes a storage tank 107 that stores the coated sand 101 as shown in FIG. The storage tank 107 can supply the coated sand 101 to the cavity 103 via the injection path 104.

  Further, as shown in FIG. 8B, the mold manufacturing apparatus includes a water vapor supply unit that supplies water vapor from the injection path 104 after removing the storage tank 107 from the mold 102. The water vapor supply means has an air supply pipe 108 that is branched and matches the three injection paths 104 so as to supply water vapor to the three injection paths 104. Water vapor is supplied to the cavity 103 via the air supply pipe 108 and the injection path 104, and the gas in the cavity 103 is discharged from the discharge path 106.

  In this mold manufacturing apparatus, coated sand 101 prepared by containing a binder and a refractory aggregate is filled into a cavity 103 of a mold 102, steam is blown into the cavity 103, and coating is performed by condensation latent heat of the blown steam. The temperature of the sand 101 is raised, and then the heated gas is blown into the molding die 102 to evaporate the condensed water in the molding die 102 and to a temperature higher than the temperature at which the binder of the coated sand 101 is solidified or cured. Therefore, the temperature rise rate of the cavity 103 is further increased to improve the strength of the manufactured mold.

  The mold manufacturing apparatus shown in FIG. 9 is an apparatus that manufactures a mold by filling the cavity 111 of the mold 110 with the coated sand 109 coated with a water-soluble binder and then drying it. The mold manufacturing apparatus includes a storage tank 112 that stores the coated sand 109 that fills the cavity 111, a coated sand filling unit 113 that fills the cavity 111 with the coated sand 109 stored in the storage tank 112, and the coated sand. Water vapor supply means 114 is provided to wet and dry the coated sand 109 by introducing water vapor into the cavity 111 from when the coated sand 109 is filled by the filling means 113 or after filling. Further, in this mold manufacturing apparatus, the water vapor supply means 114 has a pipe 115 for supplying water vapor, and this pipe 115 is arranged inside the coated sand filling means 113.

JP 2009-90334 A JP 2009-244104 A

  However, the mold manufacturing apparatus shown in FIG. 8 requires an air supply pipe 108 that can be connected to and connected to the injection path 104 of the mold 102, and a dedicated air supply pipe according to the location where the injection path 104 of the mold 102 is formed. It is necessary to prepare 108 in advance. In particular, if the shape of the cavity 103 is changed by changing the shape of the mold to be molded, depending on the shape of the cavity 103, it is necessary to change the position and number of the injection paths 104 to the cavity 103. I need it. For this reason, it is difficult to change the shape of the cavity 103 on site, and the work of changing the air supply pipe 108 in accordance with the shape change of the cavity 103 is complicated, and the connection error in which the air supply pipe 108 is attached by mistake. May occur. In addition, since a dedicated air supply pipe 108 is required for each mold 102, there is a disadvantage that a large installation space for the air supply pipe 108 is required. On the other hand, in order to reduce the types of the air supply pipes 108, a countermeasure such as forming a specific number of injection paths 104 at a certain location is conceivable. In this case, it becomes impossible to blow water vapor or the like, and there is a possibility that inconvenience that unevenness of the mold to be molded easily occurs.

  In the water-soluble mold manufacturing apparatus shown in FIG. 9 as well, it is necessary to arrange the pipe 115 inside the coated sand filling means 113, which restricts the portion of the injection path for supplying water vapor, and changes the shape of the cavity 111. Is extremely difficult. Furthermore, even when the shape of the cavity 111 is changed, it is necessary to change the position and shape of the pipe 115 according to the shape of the mold to be molded, and the switching operation of the apparatus is extremely complicated, and the replacement part There is an inconvenience that a storage place is required. Further, when the position and shape of the pipe 115 are not changed, there is a risk that a deviation occurs depending on the shape of the mold to be molded, and unevenness is likely to occur in the mold to be molded.

  The present invention has been made in view of these disadvantages, and the problem of the present invention is that it is easy and reliable even if the position of the injection path to the cavity needs to be changed based on a change in the shape of the cavity. It is another object of the present invention to provide a mold manufacturing apparatus, a mold manufacturing method, and a mold manufacturing apparatus jacket capable of changing the position or number of injection paths into the cavity and manufacturing a mold without unevenness.

The present invention has been made to solve the above-described problems, and the mold manufacturing apparatus of the present invention includes:
A mold having a cavity capable of being filled with coated sand, and an injection path and a discharge path communicating with the cavity;
Coated sand supply means for supplying the coated sand to the cavity;
A mold manufacturing apparatus comprising gas supply means for supplying gas to the cavity through the injection path,
A jacket configured to have a recess opening on the abutment surface side and a communication path for supplying gas from the gas supply means to the recess, and the recess can be attached to the mold so as to cover the external opening of the injection path. It is characterized by providing.

  In the mold manufacturing apparatus, the gas supplied from the gas supply means is supplied to the concave portion of the jacket via the communication path, and the gas supplied to the concave portion of the jacket is supplied to the cavity via the injection path. . As a result, it is necessary to change the shape of the cavity by changing the shape of the mold, and even if it is desired to form the injection path at a position suitable for the shape of the cavity, it is desired as long as it can be covered by the opening of the recess. Locations and a desired number of injection paths can be formed. Therefore, an injection path that matches the shape of the cavity can be provided, and a mold without unevenness can be manufactured.

  In the mold manufacturing apparatus, it is preferable that the mold has a plurality of injection paths, and the concave portion of the jacket is configured to cover all of the plurality of injection paths. Thereby, the gas can be supplied to the cavity efficiently and in a short time. In addition, since the isobaric gas is supplied from the concave portion of the jacket to the plurality of injection paths, it is possible to always supply a stable gas at the same pressure.

  In the mold manufacturing apparatus, the jacket includes a partition that divides a space formed by the recess into the communication path side and the recess opening side, a through hole formed in the partition, and a communication path side from the periphery of the through hole. It is preferable to have a cylindrical body projecting from. As a result, even when moisture is generated when gas is supplied to the recess of the jacket, the moisture can be prevented from entering the recess opening side by the partition wall and the cylindrical body, so that unnecessary moisture enters the cavity. Can be prevented.

  In the mold manufacturing measure, the gas supply means includes an air supply line, a water vapor supply line, a carbon dioxide supply line, and an opening / closing valve capable of switching and mixing these supply lines, and the air supply line is provided with a heater. It is preferable. Thereby, the gas to supply can be selected by adjusting the on-off valve of each supply line, and multiple types of gas can be mixed. Furthermore, by providing a heater in the air supply line, the heated air can be supplied to the cavity, so that the heated air can be supplied when the coated sand is dried.

  The air supply line, water vapor supply line, and carbon dioxide supply line are preferably provided with a flow meter and a pressure reducing valve. Thereby, while being able to adjust the flow volume, pressure, etc. of the gas supplied to a cavity, multiple types of gas can be mixed by a desired mixing ratio and can be supplied to a cavity.

  The mold manufacturing apparatus includes a storage tank in which the coated sand supply means supplies the coated sand to the cavity via the injection path, and a preheater that is disposed in the storage tank and preheats the coated sand. Preferably it is. Thereby, the coated sand in the storage tank before being supplied to the cavity can be preheated, and moisture adhering to the surface of the coated sand can be removed.

  Preferably, the gas supply means includes a water vapor supply line, and the preheater uses water vapor diverted from the water vapor supply line as a heat source. Thereby, the water vapor supply means of the gas supply means for supplying to the cavity can be used as a heat source, and it is not necessary to prepare a separate heat source, and the cost of the mold manufacturing apparatus can be suppressed.

  When the preheater uses the steam diverted from the water vapor supply line as a heat source as described above, the preheater preferably has a spiral hollow tube through which the water vapor flows. Thereby, the coated sand can be preheated evenly and efficiently by the spiral hollow tube.

  Preferably, the gas supply means includes an air supply line provided with a heater, and the preheater has an air ejection hole for ejecting air diverted from the air supply line after the heater. As a result, the coated sand can be preheated by blowing out heated air, and the coated sand can be prevented from becoming a dull state.

  The mold manufacturing apparatus preferably further includes suction means for sucking the gas discharged from the discharge path. Thereby, the stagnation of the blowing of gas is prevented, and the gas is easily distributed efficiently throughout the cavity.

Furthermore, the method for producing a mold according to the present invention includes:
A filling step of filling the cavity with coated sand;
A steam supply step for supplying steam to the coated sand filled in the cavity;
A drying step of drying the coated sand containing water vapor by the water vapor supply step,
A mold manufacturing method using the mold manufacturing apparatus configured as described above.

  According to the mold manufacturing method, the above-described mold manufacturing apparatus has the advantages. In other words, even when it is desired to change the formation location of the injection path by changing the shape of the cavity, the desired location and the desired number of injection paths can be formed in a range that can be covered by the opening of the concave portion of the jacket. An injection path that matches the shape of the cavity is provided, and a mold without unevenness can be manufactured.

  As the water-soluble binder for covering the refractory aggregate forming the coated sand, it is preferable to use one or more of thermosetting resins, saccharides, proteins, synthetic polymers, salts and inorganic polymers. Thereby, solidification and hardening of the coated sand can be made effective.

  It is preferable to use an alkali phenol resin as a water-soluble binder that covers the fireproof aggregate forming the coated sand. As a result, the quality of the mold can be improved, and the working environment for mold production can be improved.

In addition, the jacket for the mold manufacturing apparatus according to the present invention,
A mounting surface that can be mounted to cover the external opening of the injection path of the mold,
A recess formed in the mounting surface,
And a communication passage that communicates the recess and the outside,
The opening area on the mounting surface side of the recess is larger than the opening area of the communication path.

  The mold manufacturing apparatus jacket is used by being mounted on the mold of the mold manufacturing apparatus so that the concave portion covers the external opening of the injection path of the mold. Then, by connecting the gas supply means of the mold manufacturing apparatus to the communication path, the gas supplied from the gas supply means is supplied to the recess of the jacket through the communication path, and the gas supplied to the recess of the jacket is injected. Supplied to the cavity via the path. For this reason, it is necessary to change the shape of the cavity by changing the shape of the mold, and even when it is desired to form the injection path at a position suitable for the shape of the cavity, the opening of the concave portion of the jacket for the mold manufacturing apparatus is covered. A desired location and a desired number of injection paths can be formed in the mold within a possible range. Therefore, an injection path that matches the shape of the cavity can be provided, and a mold without unevenness can be manufactured.

  As described above, the mold manufacturing apparatus, the mold manufacturing method, and the mold manufacturing apparatus jacket according to the present invention need to change the position of the injection path to the cavity based on the shape change of the cavity, etc. The position or number of injection paths into the cavity can be easily and reliably changed, and a mold without unevenness can be manufactured.

Schematic sectional view showing a mold manufacturing apparatus according to the first embodiment of the present invention. Schematic sectional view showing a reservoir and gas supply means of the mold manufacturing apparatus of FIG. Typical sectional drawing which shows the state before the filling process of the coated sand of the mold manufacturing apparatus of FIG. Schematic cross-sectional view showing the coated sand filling process of the mold manufacturing apparatus of FIG. Schematic sectional view showing a mold manufacturing apparatus according to a second embodiment different from the mold manufacturing apparatus of FIG. Typical sectional drawing which shows the mold manufacturing apparatus which concerns on 3rd embodiment different from the mold manufacturing apparatus of FIG.1 and FIG.5. Schematic diagram showing the gas supply procedure of the present invention Schematic sectional view showing a conventional mold manufacturing apparatus Typical sectional drawing which shows the conventional mold manufacturing apparatus different from the mold manufacturing apparatus of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the configurations of the following embodiments.

<First Embodiment>
The mold manufacturing apparatus according to the first embodiment shown in FIG. 1 includes a molding die 3 having a cavity 7 that can be filled with a coated sand 6, a jacket 4 that is detachably attached to the molding die 3, and a gas supply device 5. 7 is provided with gas supply means for supplying gas to 7 and coated sand supply means for supplying the coated sand 6 to the cavity 7 (see FIG. 2).

(Mold 3)
The mold 3 is a vertically open mold composed of an upper mold 1 and a lower mold 2. The upper mold 1 and the lower mold 2 have a recess that forms a cavity 7, and a gas such as water vapor when the mold is closed. Is closed under pressure to prevent leakage. The mold 3 has an injection path 8 and a discharge path 9 that communicate with the cavity 7. In the upper mold 1, a plurality of the injection paths 8 are formed in the upper part. The lower mold 2 has a plurality of discharge passages 9 formed in the lower part. A mesh 10 such as a wire mesh is disposed in the opening of the discharge path 9 on the cavity 7 side, and the coated sand 6 filled in the cavity 7 is in a state where it is difficult to enter the discharge path 9 and can be ventilated. . In addition, in FIG. 1, although the thing provided with the three injection | pouring paths 8 and the three discharge paths 9 is illustrated, the formation location and formation number of the injection | pouring path 8 and the discharge paths 9 are not specifically limited, It is sufficient to form the injection path 8 and the discharge path 9 in accordance with the shape of the mold to be manufactured.

(Jacket 4)
The jacket 4 has a substantially rectangular box shape as a whole, and has a recess 11 that opens to the mounting surface side of the mold 3. The jacket 4 is mounted on the mold 3 so that the concave openings 11 cover the external openings of the plurality of injection paths 8. The jacket 4 has a contact surface that is in close contact with the side wall of the mold 3 (the upper surface of the upper mold 1) outside the recess 11, and the space portion 12 formed by the recess 11 includes a communication path 14 and a later-described communication path 14. It communicates only with the injection path 8 and is airtight in other parts. Here, the jacket 4 has, for example, a silicon seal ring disposed on the contact surface. In addition, the shape of the jacket 4 is not limited, For example, the shape of a covered cylinder etc. are employable.

  Further, the jacket 4 has a communication passage 14 for supplying gas from the gas supply means to the recess 11. This communication path 14 is formed in the wall surface (upper part of the jacket 4) facing the opening of the said recessed part 11 so that a recessed part and the exterior may be connected. The communication path 14 is provided at one place in the center of the recess 11 in plan view. Furthermore, the opening area on the recess 11 side of the communication passage 14 is provided smaller than the opening area on the mounting surface side of the recess 11. Here, the ratio of the opening area on the mounting surface side of the recess 11 to the opening area on the recess 11 side of the communication path 14 is preferably 3 to 1000 times, more preferably 5 to 500 times, and more preferably 10 times or more. 200 times or less is more preferable. If the ratio of the opening areas is less than the lower limit value, the opening on the mounting surface side of the recess 11 becomes too small, and the region covered by the recess 11 (formation region of the injection path 8) may become too small. On the other hand, if the ratio of the opening areas exceeds the upper limit value, the concave portion 11 becomes too large, and the jacket 4 may become large and difficult to handle. In addition, the formation location etc. of the communication path 14 are not limited, A several communication path 14 can also be provided, it is also possible to provide other than the upper center part of the jacket 4, and also the recessed part 11 is provided. It is also possible to form it on the side surface.

(Gas supply means)
The gas supply means includes the gas supply device 5 and connects the pipe 16 for supplying the gas of the gas supply device 5 to the concave portion 11 of the jacket 4 and the pipe 16 and the communication path 14 of the jacket 4. An on-off valve 17 that opens and closes the flow path is further provided.

  The on-off valve 17 is attached to the jacket 4, specifically, attached to the inlet 13 (upper opening) of the communication path 14 of the jacket 4.

  The gas supply device 5 is a device for supplying a gas such as water vapor to the recess 11 of the jacket 4. As shown in FIG. 2, the gas supply device 5 has a water vapor supply line 20 for supplying water vapor to a pipe 16 connected to the communication path 14 of the jacket 4, and further supplies an air to the pipe 16. 18 and a carbon dioxide supply line 19 for supplying carbon dioxide to the pipe 16.

  The air supply line 18, the carbon dioxide supply line 19 and the water vapor supply line 20 have opening / closing valves 28, 29 and 30, flow meters 21, 24 and 26, and pressure reducing valves 22, 25 and 27, respectively. The supply line has a heater 23.

  The gas supply means includes a mixing part 31 having a space part in which each gas can be mixed, and the on-off valves 28, 29 and 30 can switch the gas supplied to the pipe 16 and adjust the amount of gas. Further, gas can be mixed by the mixing unit 31. The flow meters 21, 24, 26 and the pressure reducing valves 22, 25, 27 are formed so that gas is supplied at a predetermined constant pressure. Furthermore, the heater 23 can heat the air, thereby supplying the heated air to the pipe 16.

  Further, the air supply line 18 and the water vapor supply line 20 are branched and connected to piping (described later) connected to the storage tank 32.

(Coated sand supply means)
The coated sand supply means includes a storage tank 32 as shown in FIGS. 2 to 4, and the storage tank 32 is formed in a cylindrical shape and the lower part is a mortar shape. A discharge path 34 having 33 is formed.

  Further, as shown in FIGS. 3 and 4, the coated sand supply means has a blow head 40 that can be attached to the discharge path 34 of the storage tank 32 when supplying the coated sand 6 to the cavity 7. The blow head 40 has an upper opening connected to the discharge path 34 of the storage tank 32, a storage space part that can store the coated sand 6 discharged from the discharge path 34, and a lower part of the storage space part. And a connection port 41 connectable to the injection path 8 of the mold 3. The number of connection ports 41 of the blow head 40 is the same as the number of injection paths 8 of the mold 3 and is arranged corresponding to the arrangement of the plurality of injection paths 8. The connection port 41 is formed to match the shape of the injection path 8 of the mold 3. When the arrangement of the injection path 8 of the mold 3 is changed, the connection port 41 is replaced with the injection path of the mold 3 by replacing the connection port 41 portion of the blow head 40 of the storage tank 32 or replacing the blow head 40. It is adjusted to 8.

  As shown in FIG. 2, the coated sand supply means has a preheater (not shown in FIGS. 3 and 4) that is disposed in the storage tank 32 and preheats the coated sand. This preheater has a heat exchanger 35 and a flow gas branch pipe 36. The flow gas branch pipe 36 uses the water vapor branched from the water vapor supply line 20 as a heat source, and has a spiral hollow pipe through which the water vapor flows. Specifically, the hollow tube is disposed in a spiral shape so as to surround the axis of the storage tank 32. In addition, the hollow tube of the heat exchanger 35 may be formed in a plurality of middle spaces in tandem, in parallel, or concentrically in order to structurally improve heat exchange capability. Further, as a spiral shape, it may be provided in a conical shape, a cylindrical shape, and a drum shape, may be provided in a plane spiral shape, or may be formed in an elliptical shape or a rectangular shape.

  The hollow tube of the heat exchanger 35 is not particularly limited as long as it has a good thermal conductivity. For example, a metal, ceramic, fiber reinforced plastic, or plastic can be used. More preferred.

  One end of the heat exchanger 35 is connected to a pipe connected to the steam supply line 20, and the other end is extended to the outside of the storage tank 32. The supplied water vapor is discharged to the outside.

  The flow gas branch pipe 36 has an air ejection hole 38 through which the air diverted from the air supply line 18 after the heater 23 is ejected. This flow gas branch pipe 36 is connected to the air supply line 18 and is provided with a straight pipe portion 39 disposed at the axial position of the storage tank 32, and a different diameter formed in a ring shape at the lower end portion of the straight pipe portion 39. The two annular pipe portions 37, the branch pipe branched from the straight pipe portion 39, and the connecting pipe connecting the straight pipe portion 39 and the two annular pipe portions 37. The straight pipe portion 39, the annular pipe portion 37, the branch pipe and the connection pipe are formed by hollow pipes, and are connected to the connection pipe from the branch pipe branched from the straight pipe portion 39, and the air supply line 18. More heated air is supplied. Further, the straight pipe portion 39, the annular pipe portion 37, the branch pipe and the connecting pipe are not particularly limited, but may be any one having good thermal conductivity, for example, using metal, ceramic, fiber reinforced plastic, or plastic. It can be made of copper having a high thermal conductivity.

  A plurality of air ejection holes 38 are formed in the annular pipe portion 37. The air ejection hole 38 is preferably formed on the lower side of the annular tube portion 37, and more preferably formed obliquely below or directly below. As a result, clogging due to the inflow of the coated sand 6 into the pipe or a short path of heated air is less likely to occur. Further, the air ejection holes 38 are provided in the annular pipe portion 37 at equal intervals. Although it does not specifically limit as a hole diameter of the air ejection hole 38, It is preferable that they are 0.3 mm or more and 6 mm or less.

  The shape of the flow gas branch pipe 36 is not particularly limited as long as the gas blowing hole 38 can be ejected from the lower portion of the storage tank 32.

(Coated sand)
The coated sand 6 filled in the cavity 7 is formed of a refractory aggregate and a water-soluble binder that covers the refractory aggregate.

  As the refractory aggregate, various refractory aggregates conventionally used for molds can be used. Specifically, silica sand, chromite sand, zircon sand, olivine sand, alumina sand, synthetic mullite sand and the like can be used. Further, these refractory aggregates may be fresh sand, reclaimed sand or recovered sand that has been used once or a plurality of times for molding as a casting sand, or a mixed sand thereof. As a particle size of the said refractory aggregate, the particle size of 40 or more and 80 or less is preferable in AFS index, More preferably, the particle size of 50 or more and 70 or less is more preferable.

  The water-soluble binder is also called a binder, and as the water-soluble binder, thermosetting resins, saccharides, proteins, synthetic polymers, salts, and inorganic polymers can be used. These may be used alone or in combination of two or more.

  As the thermosetting resin used as the water-soluble binder, a phenol resin such as a resol type, a novolac type or a benzylic ether type, a furan resin, an isocyanate compound, an amine polyol resin, a polyether polyol resin, or the like can be used. As the curing agent added to these resins, isocyanate compounds, organic esters, hexamethylenetetramine and the like can be used, and tertiary amines, pyridine derivatives, organic sulfonic acids and the like can be used as the curing catalyst.

  Moreover, among the said thermosetting resins, a phenol resin is preferable. This phenol resin can be prepared by reacting phenols and formaldehyde in the presence of a reaction catalyst.

  The phenols are phenols or phenol derivatives. For example, in addition to phenol, trifunctional compounds such as m-cresol, resorcinol and 3,5-xylenol, tetrafunctional compounds such as bisphenol A and dihydroxydiphenylmethane, o-cresol, p-cresol, p-ter- Bifunctional o- or p-substituted phenols such as butylphenol, p-phenylphenol, p-cumylphenol, p-nonylphenol, 2,4 or 2,6-xylenol can be used, and chlorine or A halogenated phenol substituted with bromine can also be used. These may be used alone or in combination.

  Formaldehydes may be used in the form of formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, trioxane, tetraoxane, or a part of formaldehyde may be replaced with furfural or furfuryl alcohol. Among these, formaldehydes are optimally used in the form of an aqueous solution, and formalin is mentioned as a suitable one.

  The blending ratio of the above phenols and formaldehydes is preferably such that the molar ratio of phenols to formaldehyde is in the range of 1: 0.6 to 1: 3.5, and 1: 1.5 to 1: 2. A range of 5 is more preferable.

  As a reaction catalyst used for a thermosetting resin, for example, when preparing a novolac type phenol resin, an inorganic acid such as hydrochloric acid, sulfuric acid or phosphoric acid, or an oxalic acid, paratoluenesulfonic acid, benzenesulfonic acid, xylenesulfonic acid, etc. It is preferable to use an organic acid, further zinc acetate or the like. Moreover, when preparing a resol type phenol resin, an oxide or hydroxide of alkali metal and / or alkaline earth metal can be used, and dimethylamine, triethylamine, butylamine, dibutylamine, tributylamine, diethylenetriamine, Use of aliphatic primary, secondary, and tertiary amines such as dicyandiamide, aliphatic amines having an aromatic ring such as N, N-dimethylbenzylamine, aniline, 1,5-naphthalenediamine, etc. It is preferable to use divalent metal naphthenic acid, divalent metal hydroxide, and the like such as aromatic amine, ammonia, hexamethylenetetramine and the like.

  Moreover, when diluting and using a phenol resin, you may use alcohols, ketones, ester, polyhydric alcohol, etc. as a solvent for dilution.

  As an example of the phenol resin, a water-soluble alkali phenol resin (resole resin) can be suitably used. The water-soluble alkaline phenol resin means that in the presence of a large amount of an alkaline substance, for example, in a ratio that the number of moles of the alkaline substance relative to the phenol is about 0.01 to 2.0 times mole, It is an alkaline phenol resin (resole resin) obtained by making it react. Examples of the alkaline substance include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide, and these are used alone or in combination of two or more.

  As the saccharide used as the water-soluble binder, monosaccharides, oligosaccharides, polysaccharides, and the like can be used. From various monosaccharides, oligosaccharides, polysaccharides, one kind can be selected and used alone or in combination. May be used in combination.

  As monosaccharides, glucose (glucose), fructose (fructose), galactose, and the like can be used. As oligosaccharides, disaccharides such as maltose (malt sugar), sucrose (sucrose), lactose (lactose), and cellobiose are used. be able to.

  As the polysaccharide, starch sugar, dextrin, xanthan gum, curdlan, pullulan, cycloamylose, chitin, cellulose, starch and the like can be used. As the starch, raw starch and processed starch can be used. Specifically, potato starch, corn starch, high amylose, sweet potato starch, tapioca starch, sago starch, rice starch, amaranthus starch can be used as raw starch, roasted dextrin, enzyme-modified dextrin, Acid-treated starch, oxidized starch, and dialdehyde-modified starch can be used. In addition, carboxymethyl starch, hydroxyalkyl starch, cationic starch, methylolated starch, etc. can be used as etherified starch. Higher fatty acid esterified starch can be used. Furthermore, cross-linked starch, kraft starch, wet heat-treated starch and the like can also be used.

  In addition to the above, gum arabic, tragacanth gum, xanthan gum, guar gum, locust bean gum, gellan gum, alginic acid, carrageenan, semi-synthetic polymer methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, methylhydroxypropylcellulose, ethylhydroxyethylcellulose, carboxy Gummy gums such as methylcellulose and cationized cellulose may be used.

  Carboxylic acid may be used as a curing agent for saccharides, particularly polysaccharides. The carboxylic acid is not particularly limited, and oxalic acid, maleic acid, succinic acid, citric acid, butanetetradicarboxylic acid, methyl vinyl ether-maleic anhydride copolymer, and the like can be used.

  As the protein used as the water-soluble binder, gelatin, glue or the like can be used.

  Synthetic polymers used as water-soluble binders include polyethylene oxide, poly-α-hydroxyacrylic acid, acrylic acid copolymer, acrylic ester copolymer, methacrylate ester, nonionic polyacrylamide, anionic poly Acrylamide, cationic polyacrylamide, polyaminoalkyl methacrylate, acrylamide / acrylic acid copolymer, polyvinyl sulfonic acid, polystyrene sulfonic acid, sulfonated maleic acid, polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol, polyvinyl methyl ether, polyether modified silicone, Alternatively, these modified products can be used. These may be used alone or in combination.

  Salts used as water-soluble binders include metal chlorides such as lithium, sodium, potassium, magnesium, calcium, zinc, iron, titanium, aluminum, bromides, carbonates, sulfates, borates, phosphates, Inorganic salts such as silicates can be used.

  As the inorganic polymer used as the water-soluble binder, water glass, colloidal silica, alkyl silicate, bentonite, cement and the like can be used.

  The amount of the refractory aggregate and the water-soluble binder is preferably 0.3 to 5 parts by mass in terms of solid content with respect to 100 parts by mass of the refractory aggregate. More preferably, it is blended at a ratio of 5 parts by mass or more and 3 parts by mass or less.

  In addition, the coated sand 6 has a room temperature fluidity by kneading or mixing a refractory aggregate and a water-soluble binder, coating the surface of the refractory aggregate with a water-soluble binder, and then evaporating the water of the water-soluble binder. A dry powdery water-soluble binder-coated refractory aggregate having Such water transpiration of the water-soluble binder needs to be carried out quickly before the water-soluble binder is cured. Generally, the water content is blown off within 5 minutes, preferably within 2 minutes, to dry powder. Water-soluble binder-coated refractory aggregate.

  As one means for rapidly evaporating the water content of the water-soluble binder, there is a method of kneading or mixing a preheated refractory aggregate and a water-soluble binder. By kneading or mixing the preheated refractory aggregate and the water-soluble binder, the water content of the water-soluble binder rapidly evaporates with the heat of the heated refractory aggregate. Thus, the dry coated sand 6 having a normal temperature fluidity can be suitably obtained. The preheating temperature of the refractory aggregate is appropriately selected according to the water content of the water-soluble binder, the blending amount thereof, etc., but is heated to a temperature of 100 ° C. or higher and 140 ° C. or lower. Is preferred. If the preheating temperature is too low, water cannot be effectively evaporated, and if the preheating temperature is too high, the water-soluble binder may be cured.

  The coated sand 6 formed as described above preferably has a moisture content of 0.5% by mass or less, and more preferably 0.3% by mass or less. As a result, it becomes a smooth dry powder, and becomes the coated sand 6 having excellent properties to which room temperature fluidity is imparted.

(Mold manufacturing method)
Next, a method for manufacturing a mold using the mold manufacturing apparatus according to the first embodiment will be described with reference to FIGS.

  A mold manufacturing method using the mold manufacturing apparatus includes a filling step of filling the coated sand 6 into the cavity 7, a water vapor supplying step of supplying water vapor to the coated sand 6 filled in the cavity 7, and a water vapor supplying step. A drying step of drying the wet coated sand 6;

  The filling process will be described. As shown in FIG. 3, before the coated sand 6 built in the storage tank 32 is filled in the cavity 7, the coated sand 6 is preheated by a preheater. The temperature at which the coated sand 6 is preheated by the preheater is preferably 30 ° C. or higher, more preferably 60 ° C. or higher and 80 ° C. or lower. When the preheating temperature is equal to or higher than the above temperature, moisture can be efficiently removed. When the preheating temperature is equal to or lower than the above temperature, strength reduction due to deterioration of the coated sand can be prevented.

  Next, as shown in FIG. 4, after the connecting port 41 of the blow head 40 disposed in the storage tank 32 is matched with the opening of the injection path 8 of the mold 3, the shutter 33 is opened to form the coated sand 6. Fill the cavity 7 of the mold 3. At this time, the inside of the storage tank 32 is sealed, and air is blown into the storage tank 32 or air is blown into the blow head 40 to pressurize the storage tank 32 and the blow head 40, and the coated sand 6 is It may be filled by blowing into the mold 3 with air pressure. Moreover, since the opening of the discharge path 9 is blocked by the net 10, the coated sand 6 is less likely to leak from the discharge path 9.

  Next, the steam supply process and the drying process will be described. After the coated mold 6 is filled with the coated sand 6, the storage tank 32 is removed from the opening of the injection path 8 of the mold 3, and the jacket 4 having the communication path 14 connected to the pipe 16 from the gas supply means is molded. The top of the mold 3 is matched so that the opening of the three injection passages 8 is covered. As a result, the injection path 8 communicates with the space 12 formed by the concave portion of the jacket 4 and the upper surface of the mold 3 in contact with the jacket 4 (see FIG. 1).

  Then, in the state of FIG. 1, the on-off valve 17 is opened, and the gas from the gas supply means is supplied into the mold 3. The gas supplied from the gas supply means is fed into the space portion 12 through the communication passage 14 and blown into the cavity 7 from the space portion 12 through the injection path 8.

  In the water vapor supply process, water vapor is supplied from the gas supply means, and in the drying process, carbon dioxide and heated air are supplied from the gas supply means. The procedure for supplying various gases from the gas supply means will be described below.

  First, as a first stage, water vapor is supplied to the cavity 7 of the mold 3. When supplying water vapor, the open / close valves of the air supply line 18 and the carbon dioxide supply line 19 of the gas supply means (gas supply device 5) shown in FIG. 2 are closed. The coated sand 6 is moistened with water vapor blown into the cavity 7 for a certain time, and as a second stage, the supply of water vapor is stopped and carbon dioxide is supplied to the cavity 7. At that time, the open / close valve 30 of the water vapor supply line 20 is closed, and the open / close valve 29 of the carbon dioxide supply line 19 is opened. Carbon dioxide is supplied for a certain period of time for a neutralization reaction, and in the third stage, the supply of carbon dioxide is stopped and heated air is supplied. At that time, the open / close valve 29 of the carbon dioxide supply line 19 is closed, and the open / close valve 28 of the air supply line 18 is opened. Thereby, the coated sand is heated to be solidified or cured and dried. Further, the supplied gas is discharged from the discharge path 9.

  The above-described procedure for supplying water vapor, carbon dioxide, and heated air is to supply each gas in turn as shown in FIG. On the other hand, the gas may be supplied as a mixed gas. For example, as shown in FIG. 7B, water vapor and carbon dioxide are supplied in the first stage, and carbon dioxide and heated air are supplied in the second stage. It is also possible to supply only heated air in the third stage. Further, as shown in FIG. 7C, water vapor, carbon dioxide and heated air are supplied in the first stage, carbon dioxide and heated air are supplied in the second stage, and heated air is supplied in the third stage. Alternatively, as shown in FIG. 7D, water vapor and carbon dioxide may be supplied in the first stage, carbon dioxide may be supplied in the second stage, and heated air may be supplied in the third stage. Alternatively, as shown in FIG. 7 (e), water vapor may be supplied in the first stage, carbon dioxide and heated air may be supplied in the second stage, and heated air may be supplied in the third stage. As shown in f), water vapor may be supplied in the first stage, carbon dioxide may be supplied in the second stage, heated air may be supplied after a certain time, and heated air may be supplied in the third stage. As shown in (b) to (f) of FIG. 7, by mixing and supplying the respective gases, the action of the respective gases proceeds simultaneously, and the gas supply time can be shortened. As described above, the order of the gases supplied from the gas supply means may be any combination as long as the steam is supplied first, the supply of water vapor is stopped in the middle, and the supply of heated air is finally supplied. Good. Therefore, the water vapor supply step and the drying step may be performed in parallel. Note that, depending on the water-soluble binder used, the coated sand 6 is solidified or cured from the steam supply step to the drying step, or in the drying step.

  In addition, although the coated sand 6 is neutralized by supplying carbon dioxide, and solidification and hardening of the coated sand 6 are promoted, a water-soluble binder that does not require a neutralizing reaction by supplying carbon dioxide is used. In the case of the coated sand 6, the supply of carbon dioxide may be omitted. Moreover, when drying, solidification, and hardening of the coated sand 6 are performed by a method other than heated air, the supply of heated air may be omitted.

  The supply of water vapor by the gas supply means is preferably performed at a pressure of 0.03 Mpa or more and 0.5 Mpa or less, and more preferably 0.05 Mpa or more and 0.15 Mpa or less. The temperature of the supplied water vapor is preferably 80 ° C. or higher and 120 ° C. or lower, and more preferably 95 ° C. or higher and 105 ° C. or lower. In this case, the water supply time in the first stage is preferably 3 seconds or longer and 30 seconds or shorter, and more preferably 5 seconds or longer and 15 seconds or shorter.

  The supply of carbon dioxide by the gas supply means is preferably supplied at a pressure of 0.03 Mpa or more and 0.5 Mpa or less, and more preferably 0.1 Mpa or more and 0.3 Mpa or less. Moreover, the temperature of the carbon dioxide supplied is preferably from room temperature to 60 ° C., more preferably from 40 ° C. to 60 ° C. Thereby, the temperature change in the cavity 7 can be suppressed. The supply amount of carbon dioxide per hour is preferably 100 liters / second or less, and more preferably 5 liters / second or more and 30 liters / second or less. The carbon dioxide supply time at this time is preferably 5 seconds or more and 60 seconds or less.

  Supply of heated air by the gas supply means is preferably performed at a pressure of 0.03 Mpa or more and 0.5 Mpa or less, and more preferably 0.05 Mpa or more and 0.25 Mpa or less. Further, the temperature of the supplied heated air is preferably 60 ° C. or higher and 200 ° C. or lower, and more preferably 120 ° C. or higher and 160 ° C. or lower. Thereby, the coated sand 6 in the cavity 7 can be effectively dried. The supply amount of heated air per hour is preferably 30 liters / second or more and 400 liters / second or less. The supply time of the heated air at this time is preferably 15 seconds or more and 180 seconds or less. These gas conditions are not particularly limited because they vary depending on the size of the mold.

(advantage)
In the mold manufacturing apparatus, the gas supplied from the gas supply means is supplied to the space portion 12 in the jacket 4 through the communication path 14, and the gas supplied to the jacket 4 passes through the plurality of injection paths 8. Via the cavity 7.

  For this reason, when the shape of the cavity 7 is changed by changing the shape of the mold, it is easy to dispose the injection path 8 at a position suitable for the shape of the cavity 7. Therefore, a mold without unevenness can be manufactured by the injection path 8 disposed at a desired position.

  Further, the mold manufacturing apparatus does not need to newly provide a gas flow path in accordance with the opening on the outside of the injection path 8 of the molding die 3 when the position of the injection path 8 is changed. When the arrangement of the injection path of another mold is changed and the jacket 4 is attached to the mold 3 so as to cover the injection path 8 with the concave portion 11 of the jacket 4, the same gas is used in the same jacket 4. Supply can be made. For this reason, the facility for supplying the gas to the injection path 8 only needs to prepare the jacket 4, and it is not necessary to prepare different piping facilities or the like according to the replacement of the mold. In addition, the storage space for parts necessary for mold replacement can be made compact.

  Further, for example, when gas is supplied to the plurality of injection paths 8, the pressure and temperature of the gas may change due to the difference in the length of the pipes to the respective injection paths 8, but in the mold manufacturing apparatus, Since the gas is supplied from the inside of the jacket 4 to each injection path 8 at an isothermal and equal pressure, a stable gas can always be supplied at the same pressure.

  Furthermore, since the gas supply means includes the water vapor supply line 20, the carbon dioxide supply line 19, the air supply line 18, and the switching of each of these supply lines and an on-off valve that can be mixed, the gas of each supply line is switched. Or a plurality of gases can be selected and mixed. Further, since the flow meter 26 and the pressure reducing valve 27 are provided in each supply line, gas can be supplied to the cavity 7 in the mold 3 at a constant pressure.

  Moreover, the mold manufacturing apparatus which is 1st Embodiment has the preheater in the storage tank 32, Therefore The water | moisture content adhering to the surface of the coated sand 6 can be removed, without almost deteriorating the coated sand. And the fluidity of the coated sand can be further enhanced. Moreover, the dew condensation water produced when water vapor | steam is supplied can be decreased. Then, the coated sand 6 around the heat exchanger 35 is subjected to heat exchange evenly and efficiently by the heat exchanger 35 so that preheating to a desired temperature can be smoothly performed, and the heat exchanger formed in a spiral shape. 35 and the preheater composed of the gas branch pipe 36 for flow effectively promotes the downward movement of the coated sand 6 due to its own weight, and adheres and contacts the coated sand 6 to the heat exchanger 35 and the like. The coated sand 6 can be smoothly discharged from the storage tank 32 to the cavity 7 in the mold 3. Further, the heated air blown out by the flow gas branch pipe 36 and the coated sand 6 are heat-exchanged, and further, heat-exchanged with the coated sand 6 in contact with the coated sand 6 flowing by the blown-up heated air, whereby the coated sand 6 6 can be preheated to the desired temperature. Further, since the coated sand 6 is preheated in a fluidized state by blowing out the heated air, there is little possibility that the coated sand 6 will be in a dull state or a preheating bias will occur.

  Moreover, as a water-soluble binder which coat | covers the refractory aggregate which forms the coated sand 6, it coats by using 1 or 2 or more out of a thermosetting resin, saccharides, protein, a synthetic polymer, salts, or an inorganic polymer. The sand 6 can be effectively solidified and cured.

  Furthermore, by using an alkali phenol resin, it is possible to improve the quality of a mold to be produced with few defects, etc., and to improve the working environment of mold production, such as a low odor odor during molding.

Second Embodiment
Next, the mold manufacturing apparatus which is 2nd Embodiment is demonstrated using FIG.

  The mold manufacturing apparatus shown in FIG. 5 includes a jacket having two space portions 54 and 57. The jacket includes an upper body 51 in which a communication path 61 is formed, and a lower body 52 in which a partition wall 56, a through hole 58, and a cylindrical body 59 described later are formed, and the upper body 51 and the lower body 52 are integrated. Are joined together.

  The jacket shown in FIG. 5 has the recessed part 55 formed so that the external opening of the injection path 8 of the shaping | molding die 3 might be covered similarly to 1st Embodiment. The jacket includes a partition wall 56 that divides a space formed by the recess 55 into an upper space 57 on the communication path 61 side and a lower space 54 on the opening side of the recess 55, and a plurality of partitions formed in the partition 56. A through hole 58 and a cylindrical body 59 projecting from the periphery of the through hole 58 toward the communication path 61 are provided. The upper space portion 57 and the lower space portion 54 defined by the partition wall 56 are communicated with each other through a through hole 58, and the lower space portion 54 and the cavity 7 in the mold 3 are connected via a plurality of injection paths 8. Connected. Further, the jacket has a drain hole 60 communicating with the upper space portion 57, and the drain hole 60 is formed at a position lower than the upper end of the cylindrical body 59. Further, the drain hole 60 is connected to a pipe via an on-off valve. The drain hole 60 is formed in the lower body 52 of the jacket.

  The communication path 61 communicates with the gas supply means, and the gas supplied from the gas supply means (the gas supply device 5) is supplied to the upper space portion 57 via the communication path 61 and passes through the through hole 58. It is supplied to the lower space 54. Thereafter, the gas supplied to the lower space 54 is supplied to the cavity 7 in the mold 3 through the injection path 8.

  In addition, a plurality of discharge passages 9 are formed in the lower part of the mold 3, pipes are connected to these discharge passages 9, and these pipes are connected to join one pipe, A suction device 62 is disposed on the discharge side of the junction of these pipes. By this suction machine 62, the gas supplied into the mold 3 is sucked by the suction machine 62. In addition, the suction device 62 may be provided in each pipe connected to each discharge path 9.

  By using the mold manufacturing apparatus of the second embodiment, the water vapor supplied from the communication path 61 is supplied to the upper space portion 57 and then sent to the lower space portion 54 through the through hole 58. The water vapor fed into the lower space portion 54 is supplied to the cavity 7 in the mold 3 through the respective injection paths 8. At this time, excess water droplets of water vapor supplied into the upper space portion 57 are stored at the bottom of the upper space portion 57, and the stored water is discharged from the drain hole 60 to the outside. Thereby, it can prevent that a water droplet penetrate | invades into the cavity 7, and can prevent the nonuniformity of solidification and hardening by the variation in the wet state of the coated sand 6 arising.

  The gas supplied to the cavity 7 is sucked from the discharge path 9 by the suction device 62 and discharged to the outside. Thereby, the stagnation of the blowing of the gas in the cavity 7 can be prevented, the gas can be efficiently distributed throughout the cavity 7, and the gas can be sufficiently ventilated in the poorly ventilated portion in the cavity 7. In particular, since the cavity 7 of the mold 3 for a mold having a complicated shape also has a complicated structure, the ventilation of the cavity 7 having such a structure can be performed without any delay. As a result, molding defects of the mold are unlikely to occur, and a mold having a complicated structure can be formed without modifying the mold.

<Third embodiment>
Next, the mold manufacturing apparatus which is 3rd embodiment of this invention is demonstrated using FIG.

  In the third embodiment, in order to match the shape of the mold to be manufactured, the shape of the cavity in the mold 71 and the shape and number of the injection passages 72 are different from those of the mold manufacturing apparatus of the first embodiment. The gas supply means and the jacket 4 have the same configuration as that of the mold manufacturing apparatus of the first embodiment. Even if the number and shape of the injection paths are changed in this way, the jacket 4 of the present invention can be used without preparing a new gas supply component suitable for the injection paths. That is, the same jacket 4 can be used without newly forming a flow path of water vapor to be supplied to the gas communication path according to the shape of the mold to be manufactured.

<Other embodiments>
In addition, this invention is not limited to the structure of the said embodiment, It also has the following embodiment.

  In the mold manufacturing apparatus, the mold 3 may be configured to be laterally open. Moreover, the jacket 4 may be attached to the side surface side or the lower surface side of the mold 3 depending on the mold, and a plurality of jackets 4 may be disposed on each surface. The communication path 14 is not limited to the shape in which the inflow port 13 and the outflow port 15 are linearly connected, and the communication path branches in the jacket 4, and a plurality of outflow ports serving as openings of the branched communication paths are provided. It may have a configuration. Moreover, the shape which piping protruded from the outflow port 15 to the space part 12 may be sufficient, and the structure where this piping branched in the space part may be sufficient. Further, the jacket 4 may have a drain hole for discharging water droplets. As a result, water droplets accumulated in the space 12 of the jacket 4 can be discharged.

  In addition, the concave portion of the jacket of the above embodiment is illustrated as having a substantially rectangular shape, but the shape of the concave portion is not limited to a rectangular shape, and is, for example, a substantially hemispherical shape or a substantially wide pyramid. Various shapes such as shapes can be employed.

  Moreover, in order to make it easy to mix each gas, the mixing part 31 of a gas supply means may each attach a vent hole diagonally, and the blade | wing for mixing and a static mixer may be arrange | positioned inside the mixing part 31. . Further, as a heat source for the preheater of the storage tank 32, a heater for heating may be used. Moreover, it is preferable to preheat the mixing part 31 and the jacket 4, and it is connected to the mixing part 31 and the jacket 4 from the steam supply line 20 or the air supply line 18 after the heater 23 as a heat source for this preheating. Piping may be provided.

  As described above, the mold manufacturing apparatus of the present invention is suitably used for manufacturing various molds such as molds used for manufacturing automobile parts.

DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3 Mold 4 Jacket 5 Gas supply device 6 Coated sand 7 Cavity 8 Injection path 9 Discharge path 10 Net 11 Recess 12 Space part 13 Inlet 14 Communication path 15 Outlet 16 Pipe 17 On-off valve 18 Air supply Line 19 Carbon dioxide supply line 20 Steam supply line 21 Flow meter 22 Pressure reducing valve 23 Heater 24 Flow meter 25 Pressure reducing valve 26 Flow meter 27 Pressure reducing valve 28 Open / close valve 29 Open / close valve 30 Open / close valve 31 Mixing unit 32 Storage tank 33 Shutter 34 Discharge Path 35 Heat exchanger 36 Flowing gas branch pipe 37 Annular pipe part 38 Air ejection hole 39 Straight pipe part 40 Blow head 41 Connecting port 51 Upper body 52 Lower body 54 Lower space part 55 Recessed part 56 Partition wall 57 Upper space part 58 Through hole 59 Cylindrical body 60 Drain hole 61 Communication path 62 Suction machine 71 Mold 72 Injection path

Claims (13)

A mold having a cavity capable of being filled with coated sand, and an injection path and a discharge path communicating with the cavity;
Coated sand supply means for supplying the coated sand to the cavity;
A mold manufacturing apparatus comprising gas supply means for supplying gas to the cavity through the injection path,
A jacket configured to have a recess opening on the abutment surface side and a communication path for supplying gas from the gas supply means to the recess, and the recess can be attached to the mold so as to cover the external opening of the injection path. equipped with a,
A partition in which the jacket divides a space formed by the recesses into the communication path side and the recess opening side, a through hole formed in the partition wall, and a cylinder protruding from the periphery of the through hole toward the communication path side mold manufacturing apparatus according to claim Rukoto which have a and Jo body. The mold has a plurality of injection paths,
The mold manufacturing apparatus according to claim 1, wherein the concave portion of the jacket is configured to cover all of the plurality of injection paths. The gas supply means includes an air supply line, a water vapor supply line, a carbon dioxide supply line, and an opening / closing valve capable of switching and mixing these supply lines,
Mold manufacturing apparatus according to claim 1 or claim 2 heater is provided in the air supply line. The mold manufacturing apparatus according to claim 3 , wherein a flow meter and a pressure reducing valve are provided in the air supply line, the water vapor supply line, and the carbon dioxide supply line. The coated sand supply means, and the reservoir supplying the coated sand into the cavity through the injection passage is disposed in the storage tank, claim and a preheater for preheating the coated sand 1 or The mold manufacturing apparatus according to claim 2 . The gas supply means includes a water vapor supply line,
The mold manufacturing apparatus according to claim 5 , wherein the preheater uses water vapor diverted from the water vapor supply line as a heat source. The mold manufacturing apparatus according to claim 6 , wherein the preheater has a spiral hollow tube through which the water vapor flows. The gas supply means includes an air supply line provided with a heater,
The mold manufacturing apparatus according to claim 5 , wherein the preheater has an air ejection hole for ejecting air diverted from the air supply line after the heater. The mold manufacturing apparatus according to any one of claims 1 to 8 , further comprising suction means for sucking the gas discharged from the discharge path. A filling step of filling the cavity with coated sand;
A steam supply step for supplying steam to the coated sand filled in the cavity;
A drying step of drying the coated sand containing water vapor by the water vapor supply step,
A mold manufacturing method using the mold manufacturing apparatus according to any one of claims 1 to 9 . As water-soluble binder to coat the refractory aggregate to form the coated sand, a thermosetting resin, saccharide, protein, synthetic polymer, according to claim 10 using one or more from among the salts or inorganic polymer Mold manufacturing method. The manufacturing method of the casting_mold | template of Claim 10 using an alkali phenol resin as a water-soluble binder which coat | covers the refractory aggregate which forms the said coated sand. A mounting surface that can be mounted to cover the external opening of the injection path of the mold,
A recess formed in the mounting surface,
And a communication passage that communicates the recess and the outside,
The opening area of the mounting surface side of the recess, much larger than the opening area of the concave side of the communication passage,
A partition that divides the space formed by the recess into the communication path side and the recess opening side, a through-hole formed in the partition, and a cylindrical body protruding from the periphery of the through-hole to the communication path A jacket for a mold manufacturing apparatus.

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