JP2006289376A - Method for making mold - Google Patents
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- JP2006289376A JP2006289376A JP2005109425A JP2005109425A JP2006289376A JP 2006289376 A JP2006289376 A JP 2006289376A JP 2005109425 A JP2005109425 A JP 2005109425A JP 2005109425 A JP2005109425 A JP 2005109425A JP 2006289376 A JP2006289376 A JP 2006289376A
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000000203 mixture Substances 0.000 claims abstract description 68
- 239000003232 water-soluble binding agent Substances 0.000 claims abstract description 55
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000004132 cross linking Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 150000007522 mineralic acids Chemical class 0.000 claims abstract description 14
- 150000007524 organic acids Chemical class 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- 238000000465 moulding Methods 0.000 claims description 24
- 239000004576 sand Substances 0.000 claims description 23
- 238000005187 foaming Methods 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 10
- 238000004898 kneading Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 9
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 150000001720 carbohydrates Chemical class 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- GGAUUQHSCNMCAU-ZXZARUISSA-N (2s,3r)-butane-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)C[C@H](C(O)=O)[C@H](C(O)=O)CC(O)=O GGAUUQHSCNMCAU-ZXZARUISSA-N 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 2
- 239000011976 maleic acid Substances 0.000 claims description 2
- 229910052863 mullite Inorganic materials 0.000 claims description 2
- 229910052609 olivine Inorganic materials 0.000 claims description 2
- 239000010450 olivine Substances 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052845 zircon Inorganic materials 0.000 claims description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 2
- 239000006004 Quartz sand Substances 0.000 claims 1
- 239000004615 ingredient Substances 0.000 claims 1
- 230000008016 vaporization Effects 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 10
- 238000010998 test method Methods 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 229920000881 Modified starch Polymers 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 235000000346 sugar Nutrition 0.000 description 4
- 229920001353 Dextrin Polymers 0.000 description 3
- 239000004375 Dextrin Substances 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 235000019425 dextrin Nutrition 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 235000019645 odor Nutrition 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229930006000 Sucrose Natural products 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- -1 aldehyde compound Chemical class 0.000 description 2
- 125000003172 aldehyde group Chemical group 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- 229930182490 saponin Natural products 0.000 description 2
- 150000007949 saponins Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical group CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000013527 bean curd Nutrition 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 150000002016 disaccharides Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 235000021552 granulated sugar Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 125000000185 sucrose group Chemical group 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000008256 whipped cream Substances 0.000 description 1
Abstract
Description
本発明は、水溶性バインダーを粘結剤として粒子状骨材により高強度で耐熱性を有する鋳型の造型方法に関する。 The present invention relates to a method for forming a mold having high strength and heat resistance by a particulate aggregate using a water-soluble binder as a binder.
従来、鋳造後の崩壊性が良いとして、水溶性バインダーを粘結剤として粒子状骨材により造型した鋳型が提案されている。
上記方法による鋳型造型法は粒子状骨材に水溶性バインダーと該水溶性バインダーを架橋させる２つ以上のアルデヒド基を有する多官能アルデヒド化合物及び酸性触媒を必須成分とし、すべてを添加した後混練して、得られた混練物を減圧乾燥することにより鋳型を造型する方法である（特許文献１）。
しかし、粒子状骨材と酸性触媒を同時に混練した場合、充分な鋳型強度、耐湿性、耐熱性が得られない場合があるという問題点があった。
また、アルデヒド基は、人の皮膚や粘膜（目、鼻、気管）を強く刺激し、さらに悪臭を放つという問題点があった。
2. Description of the Related Art Conventionally, molds made of particulate aggregates using a water-soluble binder as a binder have been proposed because of good disintegration after casting.
The mold making method according to the above method is based on a particulate aggregate containing a water-soluble binder, a polyfunctional aldehyde compound having two or more aldehyde groups that crosslinks the water-soluble binder, and an acidic catalyst as essential components. Thus, the obtained kneaded product is dried under reduced pressure to form a mold (Patent Document 1).
However, when the particulate aggregate and the acidic catalyst are kneaded at the same time, there is a problem that sufficient mold strength, moisture resistance, and heat resistance may not be obtained.
In addition, the aldehyde group has a problem in that it strongly stimulates human skin and mucous membranes (eyes, nose, trachea) and gives off a bad odor.
本発明は、粒子状骨材と水溶性バインダー、該水溶性バインダーを架橋させる架橋剤を混練して得られる骨材混合物を鋳型造型用空間に細部まで充填し、かつ充分な鋳型強度、耐湿性、耐熱性が効率よく得られ、不快な臭気や人体に悪影響を及ぼすガスをほとんど発生しない鋳型造型方法を提供することを目的とする。 The present invention fills the mold molding space in detail with an aggregate mixture obtained by kneading a particulate aggregate, a water-soluble binder, and a crosslinking agent that crosslinks the water-soluble binder, and has sufficient mold strength and moisture resistance. An object of the present invention is to provide a mold making method that can efficiently obtain heat resistance and hardly generate unpleasant odors or gases that adversely affect the human body.
上記の問題を解消するために請求項１に記載の鋳型の造型方法は、ｐＨ８より大きい粒子状骨材と、１種類または複数種類の水溶性バインダー、水およびｐＨ６以下の有機酸若しくは無機酸と、を混練し、かつ発泡させて発泡骨材混合物を得る工程と、そのようにして得られた発泡骨材混合物に前記水溶性バインダーと架橋反応を起こす架橋剤を添加する工程と、該発泡骨材混合物を鋳型造型用空間に充填する工程と、充填した該発泡骨材混合物中の水分を蒸発させて発泡骨材混合物を固化させ、鋳型を造型するとともに水溶性バインダーと架橋剤との架橋反応させる工程と、造型された鋳型を鋳型造型用空間から取り出す工程と、を含むことを特徴とする。
また、上記の問題を解消するために請求項１２に記載の鋳型の造型方法は、水溶性バインダーを粘結剤として粒子状骨材を用いて造型する鋳型の造型方法であって、
（１）該粒子状骨材のｐＨを計測する工程と、
（２）該粒子状骨材のｐＨが８より大きい場合には、１種類または複数種類の水溶性バインダー、水およびｐＨ６以下の有機酸あるいは無機酸を混練し、かつ発泡させる工程と、該粒子状骨材のｐＨが８以下の場合には、１種類または複数種類の水溶性バインダー、水を混練し、かつ発泡させる工程と、
（３）そのようにして得られた発泡骨材混合物に水溶性バインダーと架橋反応を起こす架橋剤を添加する工程と、
（４）発泡骨材混合物を鋳型造型用空間に充填する工程と、
（５）充填した骨材混合物中の水分を蒸発させて骨材混合物を固化させ、鋳型を造型するとともに、水溶性バインダーと架橋剤との架橋反応させる工程と、
（６）造型された鋳型を鋳型造型用空間から取り出す工程と、
を含むことを特徴とする。
In order to solve the above problem, the casting mold forming method according to claim 1 includes a particulate aggregate having a pH of more than 8, a one or more types of water-soluble binder, water, and an organic or inorganic acid having a pH of 6 or less. A foamed aggregate mixture obtained by kneading and foaming, a step of adding a crosslinking agent that causes a crosslinking reaction with the water-soluble binder to the foamed aggregate mixture thus obtained, and the foamed bone Filling the mold molding space into the mold molding space, evaporating moisture in the filled foam aggregate mixture to solidify the foam aggregate mixture, molding the mold, and crosslinking reaction between the water-soluble binder and the crosslinking agent And a step of removing the molded mold from the mold molding space.
Further, in order to solve the above-mentioned problem, the mold forming method according to claim 12 is a mold forming method in which a water-soluble binder is used as a binder and a particulate aggregate is used for forming,
(1) a step of measuring the pH of the particulate aggregate;
(2) a step of kneading and foaming one or more types of water-soluble binder, water and an organic acid or inorganic acid having a pH of 6 or less when the pH of the particulate aggregate is greater than 8, and the particles; When the pH of the aggregate is 8 or less, a step of kneading and foaming one or more types of water-soluble binder, water, and
(3) adding a crosslinking agent that causes a crosslinking reaction with the water-soluble binder to the foamed aggregate mixture thus obtained;
(4) filling the foamed aggregate mixture into the mold making space;
(5) evaporating moisture in the filled aggregate mixture to solidify the aggregate mixture, forming a mold, and causing a crosslinking reaction between a water-soluble binder and a crosslinking agent;
(6) a step of removing the molded mold from the mold molding space;
It is characterized by including.
本発明におけるｐＨ８より大きい粒子状骨材とは、ｐＨが８より大きく１４以下のアルカリ性であり、珪砂、アルミナ砂、オリビン砂、クロマイト砂、ジルコン砂、ムライト砂、各種人工骨材等のうち１種類以上を含むものからなる耐熱性粒状物である。
ｐＨ８を超える理由は、珪砂には貝殻が通常０〜４．０％含有されており、貝殻の９５％を占める主成分はアルカリ性を示す炭酸カルシウムＣａＣＯ３（ｐＨ９．５）であるためである（表１）。また、海砂から産出される珪砂に含まれる炭酸カルシウムＣａＣＯ３の含有量は、０．０１〜３．０％といわれている。なお、粒子状骨材に含まれる酸化カルシウムＣａＯ、酸化マグネシウムＭｇＯなども影響する。
ｐＨ８より大きい粒子状骨材として例えばトウチュウ製の商品名フーカーサンド（ｐＨ９．２）、トウチュウ製の商品名山海珪砂（ｐＨ８．５）、山川産業製の商品名サンパール（ｐＨ８．２）などがある。
In the present invention, the particulate aggregate having a pH of greater than 8 is alkaline having a pH of greater than 8 and 14 or less, and is 1 of silica sand, alumina sand, olivine sand, chromite sand, zircon sand, mullite sand, various artificial aggregates, and the like. It is a heat-resistant granular material comprising more than one type.
The reason for exceeding pH 8 is that silica sand usually contains 0 to 4.0% of shells, and the main component occupying 95% of shells is calcium carbonate CaCO 3 (pH 9.5), which shows alkalinity ( Table 1). The content of calcium carbonate CaCO 3 contained in the silica sand produced from the sea sand is said to be 0.01 to 3.0%. In addition, calcium oxide CaO, magnesium oxide MgO, etc. which are contained in a particulate aggregate also influence.
Examples of particulate aggregates having a pH greater than 8 include Tofu's trade name Hooker Sand (pH 9.2), Tochu's trade name Sankai Silica Sand (pH 8.5), and Yamakawa Sangyo's trade name Sun Pearl (pH 8.2). is there.
粒子状骨材のｐＨを測定する方法としては、例えば、日本鋳造技術協会（ＪＡＣＴ）の規定する鋳物砂のｐＨ試験法により測定する。この試験法でなくても粒子状骨材のｐＨを測定することはできる。表２に本発明におけるｐＨ８より大きい粒子状骨材の化学成分の一例を示す。
粒子状骨材には、ＳｉＯ２が７０％以上含まれているものや、ＭｇＯ・ＳｉＯ２が３０％以上含まれているものや、Ｃｒ２Ｏ３が４０％以上含まれているものがある。
またＺｒＯが６０％以上含まれているものや、さらにＳｉＯ２が３０％以上であり、Ａｌ２Ｏ３が６０％以上含まれているものなどもある。このように粒子状骨材の化学成分としては様々なものがあり、鋳造に使用できる粒子状骨材であれば限定されない。
As a method for measuring the pH of the particulate aggregate, for example, it is measured by a pH test method for foundry sand defined by the Japan Foundry Engineering Association (JACT). Even if this test method is not used, the pH of the particulate aggregate can be measured. Table 2 shows an example of the chemical component of the particulate aggregate having a pH value greater than 8 in the present invention.
The granular aggregate, which contains SiO 2 is 70% or more and include those which MgO · SiO 2 is contained 30% or more and, the Cr 2 O 3 is contained more than 40% .
There are also those containing 60% or more of ZrO, and those containing 30% or more of SiO 2 and 60% or more of Al 2 O 3 . As described above, there are various chemical components of the particulate aggregate, and any particulate aggregate that can be used for casting is not limited.
本発明では、ｐＨ６以下の有機酸あるいは無機酸を投入することができるが、よりよい有機酸あるいは無機酸のｐＨの範囲は、ｐＨ３以下である。ｐＨ３を超えると、酸の添加量を増やす必要があり、そのため、発泡骨材混合物内の水分を蒸発させるために時間を要するため、造型時間が長くなる。
ｐＨ３以下に該当する有機酸あるいは無機酸の種類としては、塩酸、硫酸、硝酸、酢酸、蟻酸などであり、ｐＨ３以下の酸であれば特に限定されない。
In the present invention, an organic acid or an inorganic acid having a pH of 6 or less can be added. However, a better organic acid or inorganic acid has a pH range of 3 or less. If it exceeds pH 3, it is necessary to increase the amount of acid added, so that it takes time to evaporate the water in the foamed aggregate mixture, so that the molding time becomes longer.
Examples of the organic acid or inorganic acid corresponding to pH 3 or lower include hydrochloric acid, sulfuric acid, nitric acid, acetic acid, formic acid and the like, and are not particularly limited as long as the acid is pH 3 or lower.
本発明は、ｐＨ８より大きい粒子状骨材に水溶性バインダー、水および上記有機酸あるいは無機酸を添加し、まず混練して、骨材混合物を中和させると、後に添加する架橋剤の効果を阻害しないことを見いだして成されたものである。
一方、粒子状骨材に水溶性バインダー、有機酸あるいは無機酸、水、架橋剤を同時に添加して混合した場合、中和されるのと同時に架橋剤と炭酸カルシウム等が反応してしまい架橋剤としての機能が損なわれ十分な鋳型強度を得ることができない。
有機酸または無機酸を粒子状骨材に添加する量（中和させる量）は、一義的には日本鋳造技術協会（ＪＡＣＴ）の規定する鋳物砂の酸消費量試験法より算出できる。
但し、この方法は水を添加し一時間混練後のろ過液に塩酸を加えて酸性とした後、水酸化ナトリウムで中和して特定する方法であるため、この時間内で溶出する成分の影響のみ検出される。砂中に固溶する成分、あるいは成分の表面を反応生成物が覆われる場合には、一旦中和した部分以外のものが連続的に順次に溶け出すため、中和に要する酸消費量は酸消費量試験法の値よりもはるかに高くなる。
In the present invention, when a water-soluble binder, water, and the above organic acid or inorganic acid are added to a particulate aggregate having a pH greater than 8, and first kneaded to neutralize the aggregate mixture, the effect of the crosslinking agent added later is obtained. It was made by finding out that it does not inhibit.
On the other hand, when a water-soluble binder, an organic or inorganic acid, water, and a crosslinking agent are added to the particulate aggregate and mixed at the same time, the crosslinking agent reacts with calcium carbonate, etc. at the same time as neutralization. As a result, the sufficient mold strength cannot be obtained.
The amount of the organic acid or inorganic acid added to the particulate aggregate (the amount to be neutralized) can be calculated primarily from the acid consumption test method for foundry sand defined by the Japan Foundry Engineering Association (JACT).
However, this method is to add water and acidify the filtrate after kneading for 1 hour, and then neutralize it with sodium hydroxide. Only detected. When the reaction product covers the components that are solid-dissolved in the sand, or the surface of the components, the parts other than the part that has been neutralized will dissolve sequentially and sequentially. Much higher than the value of the consumption test method.
本発明における水溶性バインダーは、常温の水に可溶でありかつ水分を蒸発させることにより固まる粘結剤で、糖類、たんぱく質、樹脂などがある。そして、糖類では、中でも澱粉もしくはその誘導体やサポニンなどの多糖類、または砂糖などの二糖類、ケン化度８０〜９５モル％のポリビニルアルコールもしくはその誘導体を用いる。
また、常温において水溶性である水溶性バインダーは水を添加し発泡骨材混合物を得るときに、水溶性バインダーと水を加熱することなく混合することができるが、常温で水に可溶でない水溶性バインダーは加熱しなければ水と混合できない。しかし、加熱して水に混合した後、常温まで冷却した状態において当該水に溶解している水溶性バインダーであれば用いることができる。
澱粉の例としては、馬鈴薯、とうもろこし、タピオカ、及び小麦粉由来のα化澱粉、デキストリンが挙げられる。澱粉誘導体の例としては、エーテル化澱粉、エステル化澱粉及び架橋澱粉が挙げられる。ポリビニルアルコール誘導体の例としては、酢酸其、カルボキシル基、酪酸基、シラノール基等含有ポリビニルアルコールが挙げられる。また砂糖はショ糖のことでブドウ糖と果糖が一個ずつ結合した糖類である。例としては上白糖、グラニュー糖が挙げられる。本発明に用いる水溶性バインダーは入手が容易である。また、α化澱粉、デキストリン、砂糖等は特に安価である。
ここで、α化澱粉、デキストリンもしくはその誘導体、サポニン、砂糖、ケン化度８０〜９５モル％のポリビニルアルコールもしくはその誘導体は、常温の水に可溶である。
本発明において、水溶性バインダーの含量は、骨材１００重量部に対して、０．１重量部乃至５．０重量部であることが望ましい。水溶性バインダーの量が０．１重量部未満では十分な強度を有する造型鋳型が得られず、水溶性バインダーの量が５．０重量部を超えると得られた鋳型が過剰な強度を有する。
The water-soluble binder in the present invention is a binder that is soluble in water at room temperature and hardens by evaporating water, and includes saccharides, proteins, resins, and the like. And among saccharides, among them, starch or derivatives thereof, polysaccharides such as saponin, disaccharides such as sugar, polyvinyl alcohol having a saponification degree of 80 to 95 mol% or derivatives thereof are used.
In addition, a water-soluble binder that is water-soluble at normal temperature can be mixed without heating the water-soluble binder and water when water is added to obtain a foamed aggregate mixture. The functional binder cannot be mixed with water without heating. However, any water-soluble binder that is dissolved in water after being heated and mixed with water and cooled to room temperature can be used.
Examples of the starch include potato, corn, tapioca, and pregelatinized starch derived from wheat flour and dextrin. Examples of starch derivatives include etherified starch, esterified starch and crosslinked starch. Examples of the polyvinyl alcohol derivative include polyvinyl alcohol containing acetic acid, carboxyl group, butyric acid group, silanol group and the like. Sugar is sucrose and is a saccharide in which glucose and fructose are combined one by one. Examples include fine white sugar and granulated sugar. The water-soluble binder used in the present invention is easily available. In addition, pregelatinized starch, dextrin, sugar and the like are particularly inexpensive.
Here, pregelatinized starch, dextrin or a derivative thereof, saponin, sugar, polyvinyl alcohol having a saponification degree of 80 to 95 mol% or a derivative thereof is soluble in water at normal temperature.
In the present invention, the content of the water-soluble binder is preferably 0.1 to 5.0 parts by weight with respect to 100 parts by weight of the aggregate. When the amount of the water-soluble binder is less than 0.1 parts by weight, a molding mold having sufficient strength cannot be obtained, and when the amount of the water-soluble binder exceeds 5.0 parts by weight, the obtained mold has excessive strength.
本発明の鋳型のように、水溶性バインダーと架橋反応を起こす架橋剤を添加することにより、水溶性バインダーを被覆した粒子状骨材同士の結合が強化され、しかも、水溶性バインダーと水分子との反応が起こりにくくなって、造型した鋳型は高湿度下においても十分な性質を保つことができる。 By adding a cross-linking agent that causes a cross-linking reaction with the water-soluble binder as in the template of the present invention, the bonding between the particulate aggregates coated with the water-soluble binder is strengthened, and the water-soluble binder and water molecules Thus, the molded mold can maintain sufficient properties even under high humidity.
本発明において用いられる架橋剤は、エステル結合による架橋をするシュウ酸、マレイン酸、コハク酸、クエン酸、ブタンテトラカルボン酸等のカルボキシル基を有する化合物及びメチルビニルエーテル−無水マレイン酸共重合体、イソブチレン−無水マレイン酸共重合体のような水溶液になるとカルボキシル基を有する化合物である。また、本発明において用いられる架橋剤は、鋳型の造型時又は注湯時に有害ガスの発生が少ない、エステル結合をする架橋剤、すなわち、カルボキシル基を有する架橋剤の使用が好ましい。 The crosslinking agent used in the present invention is a compound having a carboxyl group, such as oxalic acid, maleic acid, succinic acid, citric acid, butanetetracarboxylic acid, and the like, and methyl vinyl ether-maleic anhydride copolymer, isobutylene, which are crosslinked by an ester bond. -A compound having a carboxyl group in an aqueous solution such as a maleic anhydride copolymer. Further, as the crosslinking agent used in the present invention, it is preferable to use a crosslinking agent having an ester bond, that is, a crosslinking agent having a carboxyl group, which generates little harmful gas when casting a mold or pouring.
本発明において用いられる架橋剤の添加量は、水溶性バインダーに対し５〜３００重量％とする。架橋剤の量が水溶性バインダーに対し５重量％に満たないと架橋反応による効果が十分でなく、造型鋳型が高湿度下におかれた場合、十分な強度を保つことができない。又、架橋剤の量が水溶性バインダーに対し３００重量％を超えると、高湿度下におかれた場合に十分な強度を保つことができるが、その効果は、３００重量％の効果と変わらないため、３００重量％より多い量の架橋剤の添加は経済的でなく好ましくない。
本発明において架橋剤は水溶液として用いられ、例えば、ブタンテトラカルボン酸、クエン酸、メチルビニルエーテル―無水マレイン酸共重合体の場合、１０重量％以上の濃度の水溶液として用いられる。
The addition amount of the crosslinking agent used in the present invention is 5 to 300% by weight based on the water-soluble binder. If the amount of the crosslinking agent is less than 5% by weight based on the water-soluble binder, the effect of the crosslinking reaction is not sufficient, and sufficient strength cannot be maintained when the molding mold is placed under high humidity. Further, when the amount of the crosslinking agent exceeds 300% by weight with respect to the water-soluble binder, sufficient strength can be maintained when placed under high humidity, but the effect is not different from the effect of 300% by weight. Therefore, the addition of a crosslinking agent in an amount of more than 300% by weight is not economical and not preferable.
In the present invention, the crosslinking agent is used as an aqueous solution. For example, in the case of butanetetracarboxylic acid, citric acid, methyl vinyl ether-maleic anhydride copolymer, it is used as an aqueous solution having a concentration of 10% by weight or more.
本発明の鋳型造型法のように骨材混合物内に微細な気泡を多数有することにより、骨材混合物は優れた流動性が得られる。この骨材混合物の気泡率は５０〜８０％が好ましい。気泡率が５０％未満では造型性が悪く、８０％以上では強度が不十分となる。
なお、骨材混合物の発泡空気を均一に分散させることにより、骨材混合物を鋳型造型用空間に加圧充填する際、その流動性を向上させることができる。しかも、この発泡により粒子状骨材はホイップクリーム状に均一に分散される。
ここで、気泡率（％）＝｛（混合物全体の体積）−（粒子状骨材、水溶性バインダー及び水の体積）／（混合物全体の体積）｝×１００で計算できる。
またなお、骨材混合物を発泡させるための攪拌は、混合する攪拌機と同じ攪拌機を用いてもよく、別の攪拌機を用いてもよい。攪拌により、生じた発泡空気を骨材混合物中に均一に分散させることができる。
By having many fine bubbles in the aggregate mixture as in the mold molding method of the present invention, the aggregate mixture can have excellent fluidity. The aggregate ratio is preferably 50 to 80%. If the bubble ratio is less than 50%, the moldability is poor, and if it is 80% or more, the strength is insufficient.
In addition, the fluidity | liquidity can be improved when pressurizing and filling an aggregate mixture in the space for mold making by disperse | distributing the foaming air of an aggregate mixture uniformly. Moreover, the particulate aggregate is uniformly dispersed in the form of whipped cream by this foaming.
Here, it can be calculated by the bubble ratio (%) = {(volume of the whole mixture) − (volume of particulate aggregate, water-soluble binder and water) / (volume of the whole mixture)} × 100.
In addition, the stirring for foaming the aggregate mixture may use the same stirrer as the mixing stirrer, or may use another stirrer. By stirring, the generated foamed air can be uniformly dispersed in the aggregate mixture.
本発明において、発泡させた骨材混合物を鋳型造型用空間に充填する方法は、発泡させた骨材混合物をシリンダ内に入れ直接加圧する固体押圧手段を用いる方法、あるいは、エアにより加圧する気体押圧手段を用いる方法でも可能である。
ここで、固体押圧手段であるシリンダによる直接加圧とは、シリンダ（混合物収納手段）内の混合物を押圧機構のピストンの圧入による直接加圧の圧入方式で金型に圧入することをいう。
気体押圧手段であるエアによる加圧とは、上述の混合物収納手段内の混合物を押圧機構のピストンの圧入する方法において、ピストンの代りに、混合物収納手段の上端開口部を気密に閉鎖しかつ圧縮空気源に接続するカバーを、押圧機構のシリンダのピストンロッドの下端に設けて、混合物の金型への圧入に際しては混合物収納手段内の混合物の上面に圧縮空気（エア）を供給する方法をいう。
In the present invention, the foamed aggregate mixture is filled into the mold making space by using a solid pressing means for directly pressing the foamed aggregate mixture into a cylinder or by gas pressing using air. A method using means is also possible.
Here, the direct pressurization by the cylinder which is the solid pressing means means that the mixture in the cylinder (mixture storage means) is press-fitted into the mold by the direct press-fitting method by press-fitting the piston of the pressing mechanism.
Pressurization with air, which is a gas pressing means, refers to the above-described method of press-fitting the mixture in the mixture storage means with the piston of the pressing mechanism, in which the upper end opening of the mixture storage means is hermetically closed and compressed instead of the piston. A method of providing a cover connected to an air source at the lower end of the piston rod of the cylinder of the pressing mechanism and supplying compressed air (air) to the upper surface of the mixture in the mixture storage means when the mixture is pressed into the mold. .
本発明の鋳型造型方法において、鋳型造型用空間に充填した骨材混合物の水分を蒸発させる方法としては、鋳型造型用空間を構成する金型等を高温に加熱するもの、加熱水蒸気あるいはマイクロ波を骨材混合物に照射するもの、骨材混合物を充填した鋳型造型用空間を真空環境下に放置するもの、必要に応じた鋳型造型用空間内への通気等がある。 In the mold making method of the present invention, as a method for evaporating the moisture of the aggregate mixture filled in the mold making space, a mold or the like constituting the mold making space is heated to a high temperature, heated steam or microwave is used. There are those that irradiate the aggregate mixture, those that leave the mold making space filled with the aggregate mixture in a vacuum environment, and ventilation into the mold making space as necessary.
鋳型造型用空間を構成する高温に加熱された金型による骨材混合物中の水分の蒸発の場合では、攪拌により、骨材混合物中に分散した気泡およびバインダー中の水分が、加熱された金型の熱により鋳型中心部に集まることから、その中心部においては骨材の充填密度が低い鋳型となる。その鋳型を鋳造に用いると、中心部が低充填密度になっていることから結果的に使用する粒子状骨材、バインダーの量の削減、また鋳型の空孔部が多いことからバインダーの分解によるガス等の排出が容易となる。 In the case of evaporation of moisture in the aggregate mixture by the mold heated to a high temperature that constitutes the mold molding space, the bubbles dispersed in the aggregate mixture and the moisture in the binder are heated by the stirring. Since the heat gathers in the center of the mold, the mold has a low aggregate packing density in the center. When the mold is used for casting, the center part has a low packing density, resulting in a reduction in the amount of particulate aggregate and binder used, and because there are many voids in the mold. Emission of gas etc. becomes easy.
本発明の鋳型造型方法は、ｐＨ８より大きい粒子状骨材、１種類または複数種類の水溶性バインダー、水およびｐＨ６以下の有機酸あるいは無機酸を混練し、かつ発泡させる工程と、そのようにして得られた発泡骨材混合物に水溶性バインダーと架橋反応を起こす架橋剤を添加する工程と、発泡骨材混合物を鋳型造型用空間に充填する工程と、充填した骨材混合物中の水分を蒸発させて骨材混合物を固化させ、鋳型を造型するとともに水溶性バインダーと架橋剤との架橋反応させる工程と、造型された鋳型を鋳型造型用空間から取り出す工程と、を含むことから、架橋剤の効果を阻害されることがなく、かつ充分な鋳型強度、耐湿性、耐熱性が得られ、さらに不快な臭気や人体に悪影響を及ぼすガスをほとんど発生しないなど優れた実用効果を奏する。 The mold making method of the present invention comprises a step of kneading and foaming a particulate aggregate having a pH greater than 8, one or more water-soluble binders, water and an organic acid or an inorganic acid having a pH of 6 or less, and so on. A step of adding a crosslinking agent that causes a crosslinking reaction with a water-soluble binder to the obtained foamed aggregate mixture, a step of filling the foamed aggregate mixture into a mold molding space, and evaporating moisture in the filled aggregate mixture The effect of the cross-linking agent includes the steps of solidifying the aggregate mixture, forming the mold and cross-linking the water-soluble binder with the cross-linking agent, and removing the molded mold from the mold forming space. Excellent practical effects such as sufficient mold strength, moisture resistance, and heat resistance, and generation of unpleasant odors and gases that adversely affect the human body. Unlikely to.
本発明の最良の形態は、ｐＨ８より大きい粒子状骨材と、１種類または複数種類の水溶性バインダー、水およびｐＨ６以下の有機酸若しくは無機酸と、を混練し、かつ発泡させて発泡骨材混合物を得る工程と、そのようにして得られた発泡骨材混合物に前記水溶性バインダーと架橋反応を起こす架橋剤を添加する工程と、該発泡骨材混合物を鋳型造型用空間に充填する工程と、充填した該発泡骨材混合物中の水分を蒸発させて発泡骨材混合物を固化させ、鋳型を造型するとともに水溶性バインダーと架橋剤との架橋反応させる工程と、造型された鋳型を鋳型造型用空間から取り出す工程と、を含む。これにより、所望の鋳型を得ることができる。 The best mode of the present invention is a foamed aggregate obtained by kneading and foaming a particulate aggregate having a pH greater than 8 and one or more types of water-soluble binder, water and an organic acid or an inorganic acid having a pH of 6 or less. A step of obtaining a mixture, a step of adding a crosslinking agent that causes a crosslinking reaction with the water-soluble binder to the foamed aggregate mixture thus obtained, and a step of filling the foamed aggregate mixture in a mold making space Evaporating water in the filled foam aggregate mixture to solidify the foam aggregate mixture, molding a mold and crosslinking reaction between a water-soluble binder and a crosslinking agent, and molding the molded mold for mold molding. Removing from the space. Thereby, a desired mold can be obtained.
また、粒子状骨材のｐＨが不明の場合には、予め粒子状骨材のｐＨを測定しておく。ここで、粒子状骨材のｐＨが不明の場合に用いる粒子状骨材のｐＨの測定方法を述べる。粒子状骨材のｐＨを測定する方法としては、日本鋳造技術協会（ＪＡＣＴ）の規定する鋳物砂のｐＨ試験法により測定した。
本鋳物砂のｐＨ試験法は鋳物砂中のＨ＋、ＯＨ−金属イオン等を水中に溶解させ、その水溶液のｐＨを測定して鋳物砂のｐＨとして規定するものである。具体的な試験手順としては、洗浄したビーカーに試料である鋳物砂２０ｇを投入し、次に純水５０ｍｌを追加して、ビーカーに蓋をした後、マグネチックスターラーにて３０分間攪拌する。次いで、攪拌後放置し、上ずみ液の温度をチェックの後、ｐＨメーターの値を読みとる。同時に使用した純水のｐＨも測定する。
なお、この試験法でなくても簡易的に粒子状骨材のｐＨを測定することはできる。従って、造型中でもｐＨを測定することができる。もちろん造型前に予めｐＨを測定してもよい。
When the pH of the particulate aggregate is unknown, the pH of the particulate aggregate is measured in advance. Here, a method for measuring the pH of the particulate aggregate used when the pH of the particulate aggregate is unknown will be described. As a method of measuring the pH of the particulate aggregate, the pH was measured by a casting sand pH test method stipulated by the Japan Casting Technology Association (JACT).
The pH test method of the foundry sand is defined as the pH of foundry sand by dissolving H + , OH - metal ions, etc. in the foundry sand in water and measuring the pH of the aqueous solution. As a specific test procedure, 20 g of casting sand as a sample is put into a cleaned beaker, then 50 ml of pure water is added, the beaker is covered, and then stirred for 30 minutes with a magnetic stirrer. Next, after stirring, the temperature of the supernatant liquid is checked, and then the value of the pH meter is read. The pH of the pure water used at the same time is also measured.
In addition, even if it is not this test method, pH of a particulate aggregate can be measured easily. Therefore, pH can be measured even during molding. Of course, the pH may be measured in advance before molding.
次に、ｐＨ８以下の粒子状骨材であった場合には、この粒子状骨材と、１種類または複数種類の水溶性バインダーと、水と、を混練し、かつ発泡させて発泡骨材混合物を得た。
そして、そのようにして得られた発泡骨材混合物に水溶性バインダーと架橋反応を起こす架橋剤を添加した。
その後、該発泡骨材混合物を鋳型造型用空間に充填する工程と、充填した骨材混合物中の水分を蒸発させて骨材混合物を固化させ、鋳型を造型するとともに、水溶性バインダーと架橋剤との架橋反応させる工程と、造型された鋳型を鋳型造型用空間から取り出した。
Next, when the particulate aggregate has a pH of 8 or less, the particulate aggregate, one or more types of water-soluble binder, and water are kneaded and foamed to obtain a foamed aggregate mixture. Got.
And the crosslinking agent which causes a crosslinking reaction with a water-soluble binder was added to the foamed aggregate mixture thus obtained.
Thereafter, a step of filling the foamed aggregate mixture into the mold molding space, evaporating moisture in the filled aggregate mixture to solidify the aggregate mixture, molding the mold, and forming a mold with a water-soluble binder and a crosslinking agent The cross-linking reaction step and the molded mold were taken out from the mold making space.
なお、粒子状骨材に水溶性バインダー、有機酸あるいは無機酸、水、架橋剤を同時に添加して混合した場合、中和されるのと同時に架橋剤と粒子状骨材に含まれる炭酸カルシウム等が反応してしまい架橋剤としての機能が損なわれ十分な鋳型強度を得ることができなかった。 In addition, when a water-soluble binder, organic acid or inorganic acid, water, and a crosslinking agent are added to and mixed with the particulate aggregate, the calcium carbonate contained in the crosslinking agent and the particulate aggregate is simultaneously neutralized. And the function as a crosslinking agent was impaired, and sufficient mold strength could not be obtained.
以上のように、本発明にかかる鋳型の造型方法は、鋳鉄、鋳鋼の鋳物やアルミニウム、マグネシウムなどの軽金属鋳物の鋳造に使用する中子や主型に用いるのに適している。 As described above, the mold making method according to the present invention is suitable for use in cores and main molds used for casting cast iron, cast steel castings, and light metal castings such as aluminum and magnesium.
Claims (19)
そのようにして得られた発泡骨材混合物に前記水溶性バインダーと架橋反応を起こす架橋剤を添加する工程と、
該発泡骨材混合物を鋳型造型用空間に充填する工程と、
充填した該発泡骨材混合物中の水分を蒸発させて発泡骨材混合物を固化させ、鋳型を造型するとともに水溶性バインダーと架橋剤との架橋反応させる工程と、
造型された鋳型を鋳型造型用空間から取り出す工程と、
を含むことを特徴とする鋳型の造型方法。 a step of kneading and foaming a particulate aggregate having a pH of greater than 8 and one or more types of water-soluble binder, water and an organic acid or an inorganic acid having a pH of 6 or less to obtain a foamed aggregate mixture;
Adding a crosslinking agent that causes a crosslinking reaction with the water-soluble binder to the foamed aggregate mixture thus obtained;
Filling the foamed aggregate mixture into a mold making space;
Evaporating moisture in the filled foam aggregate mixture to solidify the foam aggregate mixture, forming a mold and causing a crosslinking reaction between a water-soluble binder and a crosslinking agent;
Removing the molded mold from the mold molding space;
A method for forming a mold, comprising:
（１）該粒子状骨材のｐＨを計測する工程と、
（２）該粒子状骨材のｐＨが８より大きい場合には、１種類または複数種類の水溶性バインダー、水およびｐＨ６以下の有機酸あるいは無機酸を混練し、かつ発泡させる工程と、
該粒子状骨材のｐＨが８以下の場合には、１種類または複数種類の水溶性バインダー、水を混練し、かつ発泡させる工程と、
（３）そのようにして得られた発泡骨材混合物に水溶性バインダーと架橋反応を起こす架橋剤を添加する工程と、
（４）発泡骨材混合物を鋳型造型用空間に充填する工程と、
（５）充填した骨材混合物中の水分を蒸発させて骨材混合物を固化させ、鋳型を造型するとともに、水溶性バインダーと架橋剤との架橋反応させる工程と、
（６）造型された鋳型を鋳型造型用空間から取り出す工程と、
を含むことを特徴とする鋳型の造型方法。 A mold making method using a particulate aggregate with a water-soluble binder as a binder,
(1) a step of measuring the pH of the particulate aggregate;
(2) when the pH of the particulate aggregate is greater than 8, the step of kneading and foaming one or more types of water-soluble binder, water and an organic acid or inorganic acid having a pH of 6 or less;
When the pH of the particulate aggregate is 8 or less, a step of kneading and foaming one or more types of water-soluble binder and water; and
(3) adding a crosslinking agent that causes a crosslinking reaction with the water-soluble binder to the foamed aggregate mixture thus obtained;
(4) filling the foamed aggregate mixture into the mold making space;
(5) evaporating moisture in the filled aggregate mixture to solidify the aggregate mixture, forming a mold, and causing a crosslinking reaction between a water-soluble binder and a crosslinking agent;
(6) a step of removing the molded mold from the mold molding space;
A method for forming a mold, comprising:
19. The mold making method according to claim 12, wherein the particulate aggregate contains 0.01 to 3.0% calcium carbonate.
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| WO2014002578A1 (en) | 2012-06-25 | 2014-01-03 | 新東工業株式会社 | Device for forming foamed kneaded material and method for forming foamed kneaded material |
| CN104057020A (en) * | 2014-05-28 | 2014-09-24 | 安徽鑫润新型材料有限公司 | Casting molding sand for high-precision casting and preparation method of casting molding sand |
| JP2016179492A (en) * | 2015-03-25 | 2016-10-13 | 株式会社ツチヨシ産業 | Artificial casting sand and manufacturing method for the same |
| JP2019171477A (en) * | 2019-07-03 | 2019-10-10 | 株式会社ツチヨシ産業 | Artificial casting sand and manufacturing method for the same |
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| WO2014002578A1 (en) | 2012-06-25 | 2014-01-03 | 新東工業株式会社 | Device for forming foamed kneaded material and method for forming foamed kneaded material |
| KR20150009598A (en) | 2012-06-25 | 2015-01-26 | 신토고교 가부시키가이샤 | Device for forming foamed kneaded material and method for forming foamed kneaded material |
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| CN104057020A (en) * | 2014-05-28 | 2014-09-24 | 安徽鑫润新型材料有限公司 | Casting molding sand for high-precision casting and preparation method of casting molding sand |
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| JP2016179492A (en) * | 2015-03-25 | 2016-10-13 | 株式会社ツチヨシ産業 | Artificial casting sand and manufacturing method for the same |
| JP2019171477A (en) * | 2019-07-03 | 2019-10-10 | 株式会社ツチヨシ産業 | Artificial casting sand and manufacturing method for the same |
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