JP2007111738A - Method for producing mold for casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a mold for casting where, even to a product shape requiring a complicated removal pattern such as a loose piece, pattern removal can be easily performed, and a mold having high dimensional precision can be efficiently produced. <P>SOLUTION: When a mold for casting is produced using a heat resistant aggregate and a removal pattern, a structure comprising an organic fiber, an inorganic fiber and a thermosetting resin is arranged in such a manner that at least a part is contacted with a casting product forming part in the removal pattern, further, the heat resistant aggregate is packed around the removal pattern with the structure arranged, thereafter, only the removal pattern is removed, and the structure is made to remain in the mold, so as to produce a mold for casting. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a casting mold used for manufacturing a casting, and a casting manufacturing method using the mold.

  Casting is generally produced by pouring molten metal (molten metal) into a mold in which a heat-resistant aggregate such as sand is used and a cavity having a target product shape is formed therein and solidifying. In general, molds are manufactured by filling a model made of wood or resin into the desired product shape with heat-resistant aggregates such as sand to which a binder is added, and after the binder has hardened, A cavity is formed by extracting (referred to as a "extracting mold") (hereinafter, models for forming a cavity by extracting a mold are collectively referred to as a sampling model).

  The mold manufacturing method using a sampling model is preferably performed once in terms of work efficiency. However, when the shape of a cast product is perpendicular to the sampling model's sampling direction and has a protrusion or a hole, the main sampling is performed. A method of forming a cavity having a complicated protrusion shape by attaching a sampling model called “retain” in combination with a model (main model) is used. In the mold manufacturing method to which “Oteikoi” is applied, since it is necessary to first extract the main model and then to remove “Okeoi”, the operation becomes complicated. In addition, “Kitekoi”, which has been used repeatedly, is difficult to manage the sampling model because defects such as dimensional defects are likely to occur in the casting if a misalignment such as wear occurs on the connection surface with the main model. Non-patent document 1).

As a technique for solving such a problem, a method using a sampling model in which a main model and a “retainer” are fixed with a magnet and a complicated connection structure such as a dovetail is simplified (see Patent Document 1 below). And a method of integrally molding a target product shape including “retained” with a foaming material, filling sand or the like in the same manner as the extraction model, and then tearing out the foaming material (see Patent Document 2 below), Etc. are known.
Casting terms and explanation (P53), Yoshinori Matsui, New Japan Foundry Forging Association (Sho 45) Japanese Patent Laid-Open No. Sho 62-203637 Japanese Patent Laid-Open No. 48-22318

  These technologies improve the overall dimensional accuracy of the sampling model, and have some effects in reducing dimensional defects in castings. The work is complicated because it is necessary, and 2) the special die-cutting work of tearing a model made of foamed material is complicated. Therefore, a means that can improve these problems has been strongly desired.

  The present invention has been made in view of the above-described problems, and an object of the present invention is a casting mold that is formed using a heat-resistant aggregate and a sampling model, For a product shape that requires a complicated sampling model, a method for producing a casting mold capable of efficiently producing a mold having a high dimensional accuracy that can be easily drawn, and a casting with a high dimensional accuracy using the mold. It is to provide a manufacturing method.

  The present inventors have arranged a structure containing organic fibers, inorganic fibers and a thermosetting resin as a part of a sampling model that usually requires “retaining”, and further has a heat-resistant aggregate. After filling around the extraction model in the mold, it was found that only the extraction model was extracted and the structure was left in the mold to achieve the above object.

  The present invention has been made on the basis of the above knowledge, and is a method for producing a casting mold that is molded using a heat-resistant aggregate and a sampling model, and includes organic fiber, inorganic fiber, and thermosetting resin. Arrange the contained structure so that it is at least partially in contact with the extraction model, and after filling the periphery of the extraction model in which the structure is arranged with heat-resistant aggregate, only the extraction model is extracted. Thus, a method for manufacturing a casting mold for leaving the structure in the mold is provided.

  Moreover, this invention provides the manufacturing method of a casting using the casting_mold | template for casting manufacture obtained by the manufacturing method of the said invention.

According to the present invention, the following effects are exhibited.
1. The method for producing a casting mold according to the present invention comprises a casting product shape that normally requires “retain” among molds manufactured using heat-resistant aggregates and sampling models. It is possible to manufacture a mold with a sampling model that does not use "", and to reduce the number of manufacturing steps of the mold.

2. The method for producing a casting mold according to the present invention does not require the use of “retainer”. Therefore, the mold resulting from wear of the connection surface between the “retainer” and the main model caused by repeated use. Dimensional defects and casting dimensional defects can be fundamentally solved.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
The structure used in this embodiment contains organic fibers, inorganic fibers, and a thermosetting resin.

  The compounding ratio of the organic fiber, the inorganic fiber, and the thermosetting resin is the organic fiber / the inorganic fiber / the thermosetting resin = 1-50 / 1-40 / 2-50 (mass ratio). Is preferred.

  The structure preferably contains inorganic particles from the viewpoints of heat resistance and economy. In that case, the blend ratio of the organic fibers, the inorganic fibers, the inorganic particles, and the thermosetting resin is the organic fibers. / Inorganic fiber / Inorganic particle / Thermosetting resin = 1 to 50/1 to 40/10 to 95/2 to 50 (mass ratio), and further 2 to 40/2 to 30/20 to 90/4. It is preferable that it is -40 (mass ratio), especially 4-30 / 4-20 / 30-85 / 6-30 (mass ratio).

  The blending ratio of the organic fibers is preferably determined from the viewpoint of the moldability of the structure and the normal temperature strength at the lower limit, and the upper limit from the viewpoint of casting surface defects accompanying an increase in the amount of gas generated from the structure during casting. The

  In addition, the blending ratio of the inorganic fibers is preferably determined in terms of the lower limit from the viewpoint of shape retention during casting of the structure, and the upper limit from the viewpoint of moldability of the structure and structure removal after casting. Is done.

  Furthermore, the upper limit of the blending ratio of the inorganic particles is determined from the viewpoint of heat resistance during casting of the structure, and from the viewpoint of formability of the structure and shape retention during casting.

  Furthermore, the blending ratio of the thermosetting resin is such that the lower limit is the normal temperature strength of the structure and the shape retention or surface smoothness during casting, and the upper limit is the amount of gas generated from the structure during casting. From the viewpoint of casting surface defects accompanying the increase, a preferable range is determined.

  The organic fiber is a component that forms a skeleton in a state before being used for casting in the structure, contributes to maintaining strength at room temperature, and improves the moldability of the structure.

  Examples of the organic fibers include paper fibers, fibrillated synthetic fibers, and recycled fibers (for example, rayon fibers). These organic fibers can be used alone or in combination of two or more. Among these, it is particularly preferable to use paper fibers because they can be formed into various forms by papermaking and sufficient strength can be obtained after dehydration and drying.

  Examples of the paper fiber include wood pulp, cotton pulp, linter pulp, bamboo straw and other non-wood pulp. As the paper fiber, these virgin pulp or waste paper pulp can be used alone or in combination of two or more. The paper fiber is particularly preferably used paper pulp from the viewpoints of easy availability, environmental protection, and reduction of manufacturing costs.

  The organic fiber preferably has an average fiber length of 0.3 to 2.0 mm, particularly 0.5 to 1.5 mm in consideration of moldability of the structure, surface smoothness, and impact resistance.

  The inorganic fiber is a component that maintains its shape without being burned by the heat of the molten metal when used mainly for casting.

  Examples of the inorganic fibers include artificial mineral fibers such as carbon fibers and rock wool, ceramic fibers, and natural mineral fibers. These inorganic fibers can be used alone or in combination of two or more. Among these, it is preferable to use pitch-based or polyacrylonitrile (PAN) -based carbon fibers having high strength even at high temperatures from the viewpoint of effectively suppressing shrinkage associated with carbonization of the thermosetting resin, and in particular, PAN-based carbon. Fiber is preferred.

  The inorganic fiber has an average fiber length of 0.2 to 10 mm, particularly 0.5 to 8 mm from the viewpoint of dewaterability when paper is formed and dehydrated, moldability of the structure, and uniformity. Is preferred.

  The inorganic particles are components that are softened by the heat of the molten metal to form a dense refractory film and improve the heat resistance of the structure.

  Examples of the inorganic particles include inorganic particles having a fire resistance of 800 to 2000 ° C., preferably 1000 to 1700 ° C. such as silica, alumina, mullite, magnesia, zirconia, mica, graphite, obsidian, and the like. From the viewpoint of forming a dense refractory film, obsidian and mullite powder are preferable. These inorganic particles may be used alone or in combination of two or more. The inorganic particles preferably have a particle diameter of 200 μm or less. In particular, inorganic particles having a fire resistance of ± 300 ° C., particularly ± 200 ° C. with respect to the casting temperature of the molten metal to be cast are preferable. Here, the fire resistance of the inorganic particles is measured by a measuring method (JIS R2204) using a Zeger cone.

Examples of the thermosetting resin include thermosetting resins such as phenol resins, epoxy resins, and furan resins. The thermosetting resin is a component that improves the strength of the structure at room temperature and the strength during hot, that is, shape retention during casting. Moreover, it is thermally decomposed by the heat at the time of casting, and the resulting carbon film imparts smoothness to the surface of the structure, resulting in the effect of improving the surface smoothness (casting surface) of the casting.
The thermosetting resin has particularly low generation of combustible gas, has a combustion suppressing effect, has a high residual carbon ratio of 25% or more after pyrolysis (carbonization), and is good for forming a carbon film during casting. It is preferable to use a phenol-based resin from the viewpoint that a smooth casting surface can be obtained. The residual carbon ratio can be determined from the residual mass after heating to 1000 ° C. in a reducing atmosphere (under a nitrogen atmosphere) by an analytical thermal analysis.

  Examples of the phenolic resin include novolak phenol resins, resol type phenol resins, modified phenol resins modified with urea, melamine, epoxy, and the like, preferably novolak phenol resins or modified resins thereof.

  The thermosetting resins may be used alone or in combination of two or more, and may be used in combination with an acrylic resin, a polyvinyl alcohol resin, or the like.

  As the addition form of the thermosetting resin, the organic fiber, the inorganic fiber or the inorganic particles are coated, powdered or emulsified and added to the raw material slurry, and after the paper making and dry-molded, Improves the strength of the structure by impregnating the organic fiber, the inorganic fiber and the inorganic particle, making the molded body after making, drying or curing, and maintaining the strength by carbonizing with the heat of the molten metal at the time of casting And what to do. In any case, a carbon film is formed by carbonization by the heat applied from the molten metal at the time of casting, and it is added if it can contribute to maintaining the strength of the structure and the like and improving the surface smoothness of the casting. May be either.

  Since the curing agent required when the novolak phenol resin is used is easily dissolved in water, it is preferably applied after dehydration of the molded body, particularly in the case of wet papermaking. It is preferable to use hexamethylenetetramine or the like as the curing agent.

  In the structure of the present embodiment, in addition to the organic fiber, the inorganic fiber, the inorganic particle, and the thermosetting resin, paper such as polyvinyl alcohol, carboxymethyl cellulose (CMC), and polyamidoamine epichlorohydrin resin is used as necessary. Other components such as a force-strengthening material, a polyacrylamide-based flocculant, and a colorant can be added at an appropriate ratio.

  The thickness of the structure according to the present embodiment can be set as appropriate according to the portion to be used, but at least the portion in contact with the molten metal has a thickness of 0.2 to 5 mm, particularly 0.4 to 2 mm. Is preferred. If it is too thin, the strength required to mold the mold by filling with heat-resistant aggregate will be insufficient, and if it is too thick, the amount of gas generated will increase during casting and surface defects of the casting will occur more easily. May become long and the manufacturing cost may be high. However, the thickness of the structure means a portion excluding a structure (concave, protrusion, etc.) for providing a bond strength with a reinforcing rib or a heat-resistant aggregate exclusively for imparting mechanical strength to the structure. Point to.

  The structure of this embodiment has a stronger bond with the heat-resistant aggregate by providing a structure and / or an adhesive layer for bonding to the heat-resistant aggregate on the surface of the structure that contacts the heat-resistant aggregate. Thus, the dimensional accuracy of the mold can be further improved. Examples of the structure for bonding with the heat-resistant aggregate include a concave portion, a convex portion, a protrusion, and a combination thereof. FIGS. 1 and 2 show an example in which a protrusion is provided (protrusion B in the figure). When providing a protrusion, the protrusion height is preferably 5 to 20 mm with respect to the adjacent portion. If it is too low, the bonding effect is reduced, and if it is too high, the mold strength is reduced due to edge breakage.

  For the adhesive layer, acrylate-based, vinyl butyral-based, vinyl alcohol-based, vinyl acetate-based, phenol-based adhesives, etc., alone or as a mixture of two or more water-based emulsions, diluted with water or alcohol-based organic solvents Can be formed by applying to the surface of the structure in contact with the heat-resistant aggregate, or by applying a double-sided tape-like material made of these adhesives. Among these, from the viewpoint of the working environment, it is preferable to apply a water-based emulsion or a water-diluted one, or to apply a double-sided tape-like one. The adhesive is a substance used for bonding two objects together, but includes an adhesive that can be used for temporary adhesion and can be peeled off later.

  When the structure of the present embodiment is manufactured through a paper making process using a raw material slurry using water as a dispersion medium, from the point of suppressing the amount of gas generation during casting as much as possible, in a state before being used for casting, The moisture content (mass moisture content) is preferably 10% or less, particularly preferably 8% or less.

  The structure of the present embodiment preferably has a specific gravity of 1.0 or less and 0.8 or less in the state before being used for modeling from the viewpoint of ease of modeling work due to lightness. Is more preferable.

  The mold indicated by the method for manufacturing a casting mold according to the present embodiment refers to all molds formed using heat-resistant aggregates and sampling models and having a cavity in the shape of a cast product on the inner surface. By applying it to a complex mold that cannot be shaped without applying “Welcome”, it is possible to reduce the number of extractions of the extraction model and reduce the number of manufacturing steps.

  Next, the manufacturing method of the structure of the present invention will be described based on the manufacturing method of the mold or the like of the above-described embodiment as a preferred embodiment thereof.

  As an example of the method for producing the structure of the present embodiment, a molding method using a wet papermaking method can be given. In the wet papermaking method, a raw material slurry containing the organic fiber, the inorganic fiber, the inorganic particles, and the thermosetting resin in the predetermined mixing ratio is prepared, and a fiber having a predetermined shape is formed by a wet papermaking method using the raw material slurry. The laminated body is made, dehydrated and dried to produce a structure.

  Examples of the dispersion medium of the raw material slurry include water, white water, and solvents such as ethanol and methanol. Among these, from the viewpoints of papermaking / dehydration stability, quality stability, cost, ease of handling, etc. Water is particularly preferable.

  The total ratio of the fibers and inorganic particles to the dispersion medium in the raw slurry is preferably 0.1 to 10% by mass, particularly 0.5 to 6% by mass. If the total proportion of the fibers and particles in the raw slurry is too large, uneven thickness tends to occur. Conversely, if the amount is too small, a local thin portion may occur.

  If necessary, additives such as the paper strength reinforcing material, the flocculant, and the preservative can be added to the raw material slurry at an appropriate ratio.

  In the papermaking process of the fiber laminate, for example, a papermaking mold having a shape substantially corresponding to the shape of the structure is provided with a number of communication holes communicating with the back of the mold, and has a mesh on the papermaking surface of the mold. Cover with a net. In the paper making, the raw material slurry may be poured and deposited with the paper making surface facing up, or the paper making mold may be immersed in the raw material slurry and sucked and deposited from the back of the paper making mold.

  When a fiber laminate having a predetermined thickness is formed on the papermaking net, the fiber laminate is dehydrated to a predetermined moisture content by passing air through the fiber laminate as necessary.

  Next, the fiber laminate is dry-molded. In this dry molding step, any method may be used as long as the desired structure shape can be obtained. For example, the fiber laminate is sandwiched between a set of heated drying molds that are manufactured in accordance with the intended shape of the structure, and dry molding is performed. The drying temperature (mold temperature) of the drying mold is preferably 180 to 250 ° C., particularly preferably 200 to 240 ° C., from the viewpoint of drying time at the lower limit and surface property deterioration due to scorching.

  Further, if the desired structure shape is obtained in the state of the fiber laminate, it may be dried as it is with a hot air dryer or the like. In this case, the lower limit of the atmospheric temperature is preferably 160 to 240 ° C., particularly preferably 180 to 220 ° C., from the viewpoint of drying time as the lower limit and thermal decomposition of the organic fiber.

  If necessary, the obtained structure can be impregnated partially or entirely with a binder, and heated and thermally cured. Examples of the binder include colloidal silica, ethyl silicate, and water glass.

  Moreover, it is preferable to heat-treat the structure to promote curing of the thermosetting resin. By performing such heat treatment, a structure having more excellent shape retention can be obtained. Such heat treatment may be performed in combination with the drying molding step or may be performed separately using a hot air dryer or the like. The degree of cure of the thermosetting resin obtained by such heat treatment is preferably 30% or more, particularly 80% or more in terms of the amount of acetone insoluble in the following thermosetting resin.

Specifically, the insoluble content of the thermosetting resin is determined as follows.
That is, about 5 g of a sample is taken from the structure, pulverized with a mill, and the mass (a) is precisely weighed. The ground sample is added to a container together with acetone and shaken sufficiently, and then left at room temperature. Next, the pulverized sample is sufficiently filtered with a filter paper (mass (c)) so that the pulverized sample does not remain in the container, and the filtered pulverized sample is dried together with the filter paper to obtain them (crushed sample and filter paper). ) (B) is precisely weighed. And based on each obtained mass (a)-(c) and the theoretical mass (d) of components other than the said thermosetting resin in the said grinding | pulverization sample, the insoluble content amount of the said thermosetting resin (( %).
Insoluble content% = 100− (a− (b−d)) × 100 / (ad)

  In the above description, the method of dry-molding into the shape of the target structure at the time of wet papermaking was explained. However, the fiber laminate is made into a sheet at the time of wet papermaking, and the object is a wet sheet-like fiber laminate. Dry molding may be performed by sandwiching between a pair of heated and dry molds manufactured according to the shape of the structure. Still further, the fiber laminate that has been made into a sheet is dried in the form of a sheet, and the dried fiber laminate is appropriately cut, bent, and bonded to obtain the desired shape of the structure. You may get. For the bonding, an adhesive, a pressure-sensitive adhesive tape, a metal fitting such as a pin / claw can be used, and a method using an adhesive is preferable, and an adhesive made of a thermosetting resin is more preferable.

  Next, the manufacturing method of the casting casting mold of the present invention will be described based on its preferred embodiment.

  In the method for producing a casting mold according to the present embodiment, a predetermined structure (for example, FIG. 1) obtained as described above is arranged so that at least a part thereof is in contact with a predetermined position of the sampling model (FIG. 2) The heat-resistant aggregate is filled around the extraction model placed in a predetermined formwork (FIG. 3), and the extraction model is extracted and at the same time the structure is left in the mold (FIG. 3). 4) A casting mold can be manufactured by assembling a mold into a predetermined shape (FIG. 5). In addition, from the viewpoint of being used as an alternative to “retaining”, it is preferable that the structure of the present invention has a concave portion in which the convex portion of the manufactured casting is formed. In addition, the structure of the present invention is preferably arranged so as to be in contact with the sampling model at a site where “retaining” is required.

  When the present invention is not used, the sampling model having the shape as shown in FIG. 2 is forced to apply “keep away”, and is forced to perform a plurality of punching operations (FIG. 9). For example, only a single die-cutting operation is required, and the number of manufacturing steps can be reduced.

  As the heat-resistant aggregate, normal ones conventionally used for producing this type of casting, including foundry sand, can be used without particular limitation. If it is necessary to cure the heat-resistant aggregate with a binder, a normal one can be used without any particular limitation.

  Further, a casting production method using the casting production mold produced according to the present invention will be described based on its preferred embodiment.

  For example, a mold assembled as shown in FIG. 5 is poured by pouring molten metal from a pouring gate (FIG. 6). At this time, the inorganic particles are softened by the heat of the molten metal to form a dense refractory film, and further, the cast skin improvement effect by the carbon film generated by the thermal decomposition of the thermosetting resin, Due to the hot shape retention effect and the like, the cast product portion in contact with the structure can obtain a healthy casting with fewer defects and a retained shape.

  The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

〔Example〕
<Preparation of raw material slurry>
After preparing a slurry of about 1% by mass in which the following organic fibers, inorganic fibers and inorganic particles were dispersed in water, the following thermosetting resin powder and an appropriate amount of the following flocculant were added to the slurry to prepare a raw material slurry. . In addition, it prepared in the ratio of organic fiber / inorganic fiber / inorganic particle / thermosetting resin powder = 25/10/45/20 (parts by mass).
Organic fiber: used newspaper (average fiber length 1mm, freeness (CSF, the same applies below) 150cc)
Inorganic fiber: PAN-based carbon fiber (“Toray Chop” manufactured by Toray Industries, Inc., fiber length 3 mm, shrinkage 0.1%)
Inorganic particles: Obsidian (“Nice catch” manufactured by Kinsei Matec Co., Ltd., average particle size 30 μm)
Thermosetting resin: Novolac phenolic resin ("SP1006LS" manufactured by Asahi Organic Materials Co., Ltd., residual charcoal rate 38%)
Flocculant: Polyacrylamide flocculant (“A110” manufactured by Mitsui Cytec)

<Paper forming molding of structure>
For the papermaking mold, a mold having a papermaking surface corresponding to the structure shown in FIG. 1 is used, a net having a predetermined mesh is arranged on the papermaking surface, and a large number of communication holes communicating the papermaking surface and the back surface are provided. The formed one was used. Furthermore, the papermaking mold was set with a frame for slurry introduction with the papermaking surface facing up. Then, the raw material slurry was circulated by a Mono pump, and while a predetermined amount of slurry was put into the frame on the papermaking mold, it was drained through the communication hole, and a predetermined fiber laminate was deposited on the surface of the net. . After completing the introduction of a predetermined amount of raw material slurry, a negative pressure of 0.05 MPa was applied from the back of the papermaking mold on which the fiber laminate was deposited, and air was vented for about 30 seconds to dehydrate the fiber laminate. A liquid in which a 15% (mass ratio) curing agent (hexamethylenetetramine) of the thermosetting resin was dispersed in water was uniformly applied to the entire surface of the obtained fiber laminate. The fiber laminate was then removed from the papermaking mold and transferred to a dry mold heated to 220 ° C. As the dry mold, there was used a set of inside and outside corresponding to the structure shown in FIG. In the dry molding process, the fiber laminate was sandwiched between a pair of inner and outer dry molds, and the fiber laminate was dried while transferring the shape of the target structure. After performing pressure drying for a predetermined time (180 seconds), the obtained molded body was taken out of the drying mold and cooled to obtain a structure having a thickness of 1.2 mm in the form shown in FIG.

<Manufacture of mold>
The structure shown in FIG. 1 is arranged at a predetermined position of the sampling model as shown in FIG. 2, and heat-resistant aggregate (flattery sand + furan resin / hardening agent) is filled around the sampling model as shown in FIG. After the heat-resistant aggregate has hardened, the extraction model is removed as shown in FIG. 4 and the structure is left in the mold and assembled into a predetermined shape as shown in FIG. did.

<Manufacture of castings>
A molten metal (molten metal) having a casting material FC-300 and a casting temperature of 1380 ° C. was poured into the mold of FIG. 5 and solidified, then the mold was broken and the casting was taken out (FIG. 6).

<Result>
A casting having a predetermined shape shown in FIG. 6 was obtained. The extraction work of the extraction model was simple and simple. Also, the projection B shown in FIGS. 1 and 2 did not shift the structure during die cutting, and the dimensional accuracy was good.

[Comparative example]
A casting having the same shape as that of the example was manufactured by a mold manufacturing method according to the “retain” method.

<Manufacture of mold>
As shown in FIG. 7, using the main model and “retained”, as shown in FIG. 8, filled with heat-resistant aggregate (flattery sand + furan resin / hardener) and molded, the heat-resistant bone After the material was cured, the extraction model and “retained” were extracted as shown in FIG. 9, and the mold was assembled into a predetermined shape as shown in FIG.

<Manufacture of castings>
The molten metal was poured into the mold of FIG. 10 under the same conditions as in the example, and the casting was taken out.

<Result>
A casting having a predetermined shape shown in FIG. 11 was obtained. As shown in Fig. 9, the extraction of the sampling model requires one time for the main model and two times for the "retaining". The "retracting" is a complicated procedure in which it is extracted sideways and then extracted to the front. Forced. In addition, the larger the mold, the greater the risk of the “collapse” being extracted, but the risk of collapse of the mold increases. In the case of the present invention, the “collapse” is not necessary, so it is very safe. It is excellent.

It is a figure which shows typically one Embodiment of the structure used for the manufacturing method of the casting_mold | template of this invention. It is a figure which shows typically one Embodiment of the extraction model in which the structure of FIG. 1 is arrange | positioned. It is the schematic which shows a mode that a casting_mold | template is shape | molded using the extraction model of FIG. It is the schematic which shows a mode that the extraction model is extracted from the casting_mold | template shape | molded by FIG. It is a figure which shows typically the casting_mold | template obtained using the casting_mold | template (upper mold | type) of FIG. It is the schematic which shows the method of manufacturing a casting using the casting_mold | template of FIG. It is the schematic which shows an example of the conventional model which used "remaining". It is the schematic which shows a mode that a casting_mold | template is shape | molded using the model of FIG. It is the schematic which shows a mode that the main model and a "retaining" are extracted from the casting_mold | template shape | molded by FIG. It is a figure which shows typically the casting_mold | template obtained using the casting_mold | template (upper mold | type) of FIG. It is the schematic which shows the method of manufacturing a casting using the casting_mold | template obtained by FIG.

Claims (5)

  A method for producing a casting mold that is formed using a heat-resistant aggregate and a sampling model, wherein a structure containing organic fibers, inorganic fibers, and a thermosetting resin is at least partly with respect to the sampling model. Is placed in contact with each other, and further filled with heat-resistant aggregate around the extraction model on which the structure is arranged, then only the extraction model is extracted, and the structure is left in the mold. Mold manufacturing method.   The manufacturing method of the casting mold for casting according to claim 1, wherein the structure further contains inorganic particles.   The method for producing a casting mold according to claim 1 or 2, wherein the structure has a structure and / or an adhesive layer for bonding to the heat-resistant aggregate on a surface in contact with the heat-resistant aggregate.   The said structure is obtained by the manufacturing method which comprises the papermaking process using the raw material slurry which contains the said organic fiber, the said inorganic fiber, and the said thermosetting resin at least in any one of Claims 1-3. The manufacturing method of the casting mold for description.   A casting production method using the casting production mold obtained by the production method according to claim 1.

Images