JP2001232442A - Composition for sweeping molding, and forming method for sweeping mold - Google Patents
Composition for sweeping molding, and forming method for sweeping moldInfo
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- JP2001232442A JP2001232442A JP2000047256A JP2000047256A JP2001232442A JP 2001232442 A JP2001232442 A JP 2001232442A JP 2000047256 A JP2000047256 A JP 2000047256A JP 2000047256 A JP2000047256 A JP 2000047256A JP 2001232442 A JP2001232442 A JP 2001232442A
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Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、造型性に優れ、し
かも、注湯時に多量の有機ガスを発生する事なく、作業
環境が良好で、且つ、鋳物のガス欠陥が減少し、砂再生
率が極めて高い掻型造型用組成物と掻型造型用鋳型形成
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is excellent in moldability, does not generate a large amount of organic gas at the time of pouring, has a good working environment, reduces gas defects in castings, and has a sand recycle rate. And a method for forming a mold for a scrap mold.
【０００２】[0002]
【従来の技術】鋳型造型法の一つとして掻型造型法があ
る。これは、船舶のプロペラや曲がり管のような製品の
鋳型の造型法であり、掻板を製品断面の中心を軸として
回転させ、余分な混練砂を掻き取って鋳型を造型する方
法であり、製作個数が少なく、大型製品の鋳造方法とし
て好適である。そして、この掻型造型法は、積み重ね性
及び切れ性が要求される。積み重ね性とは、枠に対して
砂を積み重ねて行く際に、上部の砂の重みにより下部の
砂が崩れない性質である。一方、切れ性とは、掻板で掻
いた際、砂の表面を平滑に仕上げる事が出来る性質を言
う。この様な要求に応えるものとして、骨材である砂に
水ガラス及び水を添加し、ダイカルシウムシリケートを
硬化剤として造型する方法、又、骨材である砂にエステ
ル硬化フェノールホルムアルデヒド樹脂（以下、フェノ
ール樹脂と称す）及び水を添加し、エステル類を硬化剤
として造型する方法（特開平７−２６５９９５）があ
る。2. Description of the Related Art As one of mold molding methods, there is a scrap molding method. This is a method of molding a mold of a product such as a ship's propeller or bent pipe, and a method of rotating a scraping plate around the center of the product cross section, scraping excess kneading sand, and molding a mold. Since the number of manufactured products is small, it is suitable as a casting method for large products. In addition, this scrap molding method requires a stacking property and a cutting property. The stacking property is a property that the lower sand does not collapse due to the weight of the upper sand when the sand is stacked on the frame. On the other hand, the cutting property refers to a property that the surface of sand can be finished smoothly when scratched with a scraping plate. In response to such demands, a method of adding water glass and water to sand as an aggregate and molding using dicalcium silicate as a curing agent, and an ester-cured phenol formaldehyde resin (hereinafter, referred to as “aggregate sand”) There is a method of adding phenol resin (hereinafter referred to as phenolic resin) and water, and molding using an ester as a curing agent (JP-A-7-265959).
【０００３】[0003]
【発明が解決しようとする課題】骨材である砂に無機系
粘結剤である水ガラス及び水を添加し、ダイカルシウム
シリケートを硬化剤として造型した鋳型は、粘結剤であ
る水ガラスの添加量を多くしないと鋳型を造型する事が
出来ず、鋳込み後の型バラシ及び砂再生が非常に困難で
ある。又、骨材である砂に有機系粘結剤であるフェノー
ル樹脂及び水を添加し、エステル類を硬化剤として造型
した鋳型は、鋳造後の型バラシ及び砂再生も良好である
が、注湯時に多量の有機ガスを発生し、船舶のプロペラ
等の大型銅合金では、ガス欠陥が発生し易い。SUMMARY OF THE INVENTION A mold obtained by adding water glass and water as an inorganic binder to sand as an aggregate and molding dicalcium silicate as a hardener is used to form water glass as a binder. If the addition amount is not increased, the mold cannot be formed, and it is very difficult to regenerate the mold and sand after casting. In addition, a mold in which phenol resin and water as an organic binder are added to sand as an aggregate, and a mold is formed using an ester as a curing agent has good mold dispersion and sand regeneration after casting. Occasionally, a large amount of organic gas is generated, and large copper alloys such as propellers of ships are likely to generate gas defects.
【０００４】[0004]
【課題を解決するための手段】本発明は、これら問題点
に鑑みなされたもので、積み重ね性と切れ性（以下、掻
型特性と称す）が良好で、しかも、作業環境が良く、鋳
物のガス欠陥が大幅に低減する掻型造型用組成物及び形
成方法を提供する事に関するものである。つまり、ガス
欠陥等のフェノール樹脂に由来する鋳造欠陥が発生し易
い部位、欠陥の基となる部位、及び、掻型特性を要求さ
れる部位（主に溶湯に接触する鋳型の肌面）には、骨材
である砂に水ガラス及び水を添加した掻型造型用組成物
を使用し、エステル類又は、ダイカルシウムシリケート
を硬化剤とし、必要に応じて炭酸ガスを併用する。一
方、鋳型強度、掻型特性の要求される部位（鋳型の肌面
の一部と溶湯の接触しない大部分を占める鋳型の裏面）
には、骨材である砂にフェノール樹脂及び水を添加した
掻型造型用組成物を使用し、エステル類を硬化剤とし鋳
型を形成する事にある。ここで使用されるフェノール樹
脂は、固形分濃度が２０〜８０重量％のエステル硬化フ
ェノールホルムアルデヒド樹脂で、砂に対し０．５〜４
重量％添加する。水は、砂に対して、０．２５〜４重量
％添加する。エステル類を硬化剤とし、砂に対し０．０
８〜１．６重量％添加させる。一方、ここで使用される
水ガラスは、固形分濃度２０〜７０重量％、モル比１．
６〜４（ＳｉＯ２／Ｍ、Ｍ＝Ｋ２Ｏ、Ｎａ２Ｏ）、ボー
メ度３４〜５８（２０℃）の水ガラスで、砂に対し１〜
８重量％添加する。水は、砂に対して、０．２５〜４重
量％添加する。エステル類の硬化剤は、砂に対し０．０
８〜１．６重量％添加する。ダイカルシウムシリケート
は、砂に対し０．５〜５重量％添加する。DISCLOSURE OF THE INVENTION The present invention has been made in view of these problems, and has a good stacking property and a good cutting property (hereinafter referred to as scraping characteristics), a good working environment, and a good casting environment. The present invention relates to providing a composition for forming a mold by which gas defects are significantly reduced, and a method for forming the composition. In other words, parts where casting defects derived from phenol resin such as gas defects are likely to occur, parts that are the base of the defects, and parts that require scraping characteristics (mainly the skin surface of the mold that comes into contact with the molten metal) Using a composition for scraping molding in which water glass and water are added to sand as an aggregate, using an ester or dicalcium silicate as a curing agent, and using carbon dioxide gas as needed. On the other hand, parts requiring mold strength and scraping characteristics (the back of the mold that occupies most of the surface of the mold and does not come into contact with the molten metal)
Is to use a composition for scraping molding in which phenol resin and water are added to sand as an aggregate, and to form a mold using esters as a curing agent. The phenol resin used here is an ester-cured phenol formaldehyde resin having a solid content of 20 to 80% by weight, and is 0.5 to 4 wt.
% By weight. Water is added in an amount of 0.25 to 4% by weight based on sand. Esters are used as hardeners and 0.0
8 to 1.6% by weight is added. On the other hand, the water glass used here has a solid content of 20 to 70% by weight and a molar ratio of 1.
6-4 (SiO 2 / M, M = K 2 O, Na 2 O), water glass with a Baume degree of 34-58 (20 ° C.), 1 to sand
Add 8% by weight. Water is added in an amount of 0.25 to 4% by weight based on sand. Ester hardener is 0.0
8 to 1.6% by weight is added. The dicalcium silicate is added to the sand in an amount of 0.5 to 5% by weight.
【０００５】（作用）有機系粘結剤の主剤であるフェノ
ール樹脂は、水溶性であるため所定量の水に分散させる
事が出来、造型時に樹脂の優れた接着性と、砂に添加し
た水の持つ表面張力による結合力により、少ない粘結剤
量で、掻型造型に要求される掻型特性良好な掻型造型用
組成物を得ることが出来る。しかも、粘結剤量が少なく
て済む為、鋳込み後の崩壊性、砂再生（再生率；９０％
以上）が良好となる。一方、無機系粘結剤の主剤である
水ガラスも、水溶性であるため所定量の水に分散させる
事が出来、エステル類、又は、ダイカルシウムシリケー
トを硬化剤（必要に応じ炭酸ガスを併用）にする事によ
り、掻型特性良好な掻型造型用組成物を得る事が出来
る。そして、水ガラス使用の鋳型は、フェノール樹脂使
用の鋳型と比較して、鋳型強度、造型効率、砂再生率に
劣るため、高鋳型強度、良好な造型効率と高砂再生率を
維持する為には、フェノール樹脂との併用が必要不可欠
となる。因みに、ダイカル法では、新砂を一度使用すれ
ば、砂を廃棄処理するか、８０％以下の再生率で再生さ
れた砂を古砂として再使用し、その後、廃棄処理とな
る。(Function) The phenol resin, which is the main component of the organic binder, is water-soluble and can be dispersed in a predetermined amount of water. Due to the binding force due to the surface tension of the composition, it is possible to obtain a composition for scrap molding that has good scraping properties required for scrap molding with a small amount of binder. In addition, since the amount of the binder is small, disintegration after casting and sand regeneration (regeneration rate: 90%
Above) is good. On the other hand, water glass, which is the main component of the inorganic binder, is also water-soluble and can be dispersed in a predetermined amount of water. Ester or dicalcium silicate is used as a curing agent (optionally using carbon dioxide gas if necessary). ), It is possible to obtain a composition for mold making with good scraping properties. And since the mold using water glass is inferior to the mold using phenolic resin in mold strength, molding efficiency and sand recycling rate, in order to maintain high mold strength, good molding efficiency and high sand recycling rate, , A combination with phenol resin is indispensable. By the way, according to the Dikal method, once fresh sand is used, the sand is discarded, or the sand regenerated at a regeneration rate of 80% or less is reused as old sand, and thereafter, is discarded.
【０００６】粘結剤であるフェノール樹脂が、砂の重量
に対して０．５重量％未満では、硬化した後の鋳型の強
度が過小となる為、すくわれ、差し込み等の鋳造欠陥が
生じるおそれがある。一方、４重量％を越えると強度が
過大となり、鋳造後の崩壊性、砂再生が悪化する。又、
水の添加量が０．２５重量％未満では、造型性が向上せ
ず、一方、４重量％を越えると造型性は大きく改善され
るものの、乾燥後の強度不足が顕著となる。If the phenolic resin as a binder is less than 0.5% by weight based on the weight of the sand, the strength of the mold after curing becomes too low, and casting defects such as scooping and insertion may occur. There is. On the other hand, if it exceeds 4% by weight, the strength becomes excessive, and the disintegration after casting and the sand regeneration deteriorate. or,
If the amount of water is less than 0.25% by weight, the moldability is not improved, while if it exceeds 4% by weight, the moldability is greatly improved, but the strength shortage after drying becomes remarkable.
【０００７】粘結剤である水ガラスが、砂の重量に対し
て１重量％未満では、硬化した後の鋳型の強度が過小と
なる為、すくわれ、差し込み等の鋳造欠陥が生じるおそ
れがあり、一方、８重量％を越えると強度が過大とな
り、鋳造後の崩壊性、砂再生が悪化する。又、水の添加
量が０．２５重量％未満では、造型性が向上せず、一
方、４重量％を越えると造型性は大きく改善されるもの
の、乾燥後の強度不足が顕著となる。If the water glass as a binder is less than 1% by weight based on the weight of the sand, the strength of the mold after hardening is too low, so that casting defects such as scooping and insertion may occur. On the other hand, if it exceeds 8% by weight, the strength becomes excessive, and the disintegration after casting and the sand regeneration deteriorate. When the amount of water is less than 0.25% by weight, the moldability is not improved. On the other hand, when the amount exceeds 4% by weight, although the moldability is greatly improved, the insufficient strength after drying becomes remarkable.
【０００８】[0008]
【発明の実施の形態】以下に具体例を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples are shown below.
【０００９】[0009]
【実施例】本発明の掻型造型用組成物は、骨材を構成す
る砂と粘結剤と水からなり、前述粘結剤は、フェノール
樹脂及び水ガラス、それらを硬化させる硬化剤を主成分
とするものである。前述骨材となる砂は、珪砂、アルミ
ナ砂、ムライト砂、ジルコン砂、クロマイト砂、オリビ
ン砂などが使用出来る。砂の粒径は、通常、砂再生を考
慮して、ＡＦＳ粒度指数２０〜７０、より好ましくは、
３５〜６０程度のものが使用される。粒度指数が２０未
満では造型性に劣り、一方、７０を越えると砂再生が悪
化するようになる。粒度指数が大きい（平均粒度が小さ
い）程、造型性は向上するので、高い造型性を要求され
る場合は、粒度指数の大きい、即ち、細かい砂を使用す
れば良い。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The composition for mold making of the present invention comprises sand, a binder and water constituting an aggregate. The binder mainly comprises a phenol resin and water glass, and a curing agent for curing them. Component. As the sand serving as the above-mentioned aggregate, silica sand, alumina sand, mullite sand, zircon sand, chromite sand, olivine sand and the like can be used. The particle size of the sand is generally set to an AFS particle size index of 20 to 70, more preferably, in consideration of sand regeneration.
Those having about 35 to 60 are used. If the particle size index is less than 20, the moldability is inferior, while if it exceeds 70, the sand regeneration becomes worse. The larger the particle size index (the smaller the average particle size), the better the moldability. Therefore, when high moldability is required, a sand having a large particle size index, that is, fine sand may be used.
【００１０】有機系粘結剤の主剤であるフェノール樹脂
は、フェノール類としてフェノール、ビスフェノールＡ
等があるが、いずれを使用して良く、又、２種類以上の
混合物であっても良い。アルデヒド類として、ホルマリ
ン、パラホルムアルデヒド等があるが、いずれを使用し
て良く、又、２種類以上の混合物であっても良い。アル
カリ性触媒として、水酸化カリウム、水酸化ナトリウ
ム、水酸化リチウム等のアルカリ水和物があるが、いず
れを使用してよく、又、２種類以上の混合物であっても
よい。更に、前述のフェノール樹脂の有効固形分は、２
０〜８０％、好ましくは、４０〜７０％のものが良い。
又、フェノール樹脂の硬化剤として、プロピレンカーボ
ネート、γ−ブチロラクトン、エチレングリコールジア
セテート、トリアセチン、二塩基酸エステル等が挙げら
れ、その他のエステル類も使用可能である。これらのエ
ステルが砂に対して０．０８〜１．６重量％、好ましく
は、０．２〜０．９重量％使用される。０．０８重量％
未満では、硬化不足による鋳型強度低下が生じ、一方、
１．６重量％を越えると過剰の硬化剤による溶剤効果で
硬化障害を起こすからである。Phenol resins, which are the main components of organic binders, are phenols such as phenol and bisphenol A.
Any of these may be used, and a mixture of two or more types may be used. Aldehydes include formalin and paraformaldehyde, and any of them may be used, or a mixture of two or more types may be used. Examples of the alkaline catalyst include alkali hydrates such as potassium hydroxide, sodium hydroxide, and lithium hydroxide. Any of these may be used, or a mixture of two or more kinds may be used. Further, the effective solid content of the above-mentioned phenol resin is 2
0-80%, preferably 40-70%.
Examples of the curing agent for the phenol resin include propylene carbonate, γ-butyrolactone, ethylene glycol diacetate, triacetin, and dibasic acid esters, and other esters can also be used. These esters are used in an amount of 0.08 to 1.6% by weight, preferably 0.2 to 0.9% by weight, based on the sand. 0.08% by weight
If less, the mold strength is reduced due to insufficient curing, while
If the amount exceeds 1.6% by weight, the curing effect is caused by the solvent effect of the excessive curing agent.
【００１１】無機系粘結剤の主剤である水ガラスは、代
表的な物として珪酸ソーダ、又は、珪酸カリウムを用
い、２種類以上の混合物でもよい。それらの水ガラスの
固形分濃度が２０〜７０重量％、モル比１．５〜４（Ｓ
ｉＯ２／Ｍ、Ｍ＝Ｋ２Ｏ、Ｎａ ２Ｏ）、ボーメ度３４〜
５８（２０℃）の物を使用する。又、水ガラスの硬化剤
として、プロピレンカーボネート、γ−ブチロラクト
ン、エチレングリコールジアセテート、トリアセチン、
二塩基酸エステル等が挙げられ、その他のエステル類も
使用可能である。これらのエステルが、砂に対して、
０．０８〜１．６重量％、好ましくは、０．１５〜１．
２重量％使用される。０．０８重量％未満では、硬化不
足による鋳型強度低下が生じ、一方、１．６重量％を越
えると過剰の硬化剤による溶剤効果で硬化障害を起こす
からである。ダイカルシウムシリケートは、砂に対し
て、０．５〜５重量％使用される。０．５重量％以下だ
と硬化不足による鋳型強度低下が生じ、一方、５重量％
を越えると、鋳型強度向上は見込めず、添加量増による
コスト高となる。Water glass, which is the main component of the inorganic binder, is
Use sodium silicate or potassium silicate as a representative
Or a mixture of two or more. Of those water glasses
Solid content concentration is 20 to 70% by weight, molar ratio is 1.5 to 4 (S
iO2/ M, M = K2O, Na 2O), Baume degree 34 ~
Use 58 (20 ° C.). Also, hardener for water glass
, Propylene carbonate, γ-butyrolact
, Ethylene glycol diacetate, triacetin,
Dibasic acid esters and the like, and other esters
Can be used. These esters, on the sand,
0.08 to 1.6% by weight, preferably 0.15 to 1.
Used at 2% by weight. If it is less than 0.08% by weight, curing is
Decrease in mold strength due to feet, while exceeding 1.6% by weight
Causes curing failure due to the solvent effect of excess curing agent
Because. Die calcium silicate against sand
And 0.5 to 5% by weight. Less than 0.5% by weight
And 5% by weight
Above, the strength of the mold cannot be improved,
The cost is high.
【００１２】掻型造型用組成物中の水は、砂に対して、
０．２５〜４重量％配合されるが、予め、粘結剤に添加
するか、混練時に添加してもよく、その他、混合の仕方
は自由である。[0012] The water in the composition for shaping mold is
It is added in an amount of 0.25 to 4% by weight, but it may be added to the binder in advance or added at the time of kneading.
【００１３】（実施例１）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を２重量％、硬
化剤（エチレングリコールジアセテート）を０．４重量
％、水を０．７重量％添加混合して掻型造型用組成物を
調整し、角度４５°、５０×１００ｃｍの、木製の板の
上に厚さ３０ｃｍに積み重ねた。又、鋳型強度測定の
為、５０φ×５０ｍｍの圧縮強さ測定用木型に約３／４
の高さまで充填した。次に、砂１００部に対して、水ガ
ラス（モル比２．５、ボーメ度４８）を３重量％、硬化
剤（エチレングリコールジアセテート）を０．４５重量
％、水を０．７重量％添加混合して掻型造型用組成物を
調整した。そして、先に積み重ねた掻型造型用組成物の
上に厚さ１０ｃｍに積み重ねた。そして、角度４５°の
三角形の板を両脇に置き、掻板で掻型造型用組成物を掻
き、掻型特性を確認した。これとは別に、５００φ×１
００ｍｍの鋳物作製用木型（Ｓ／Ｍ比、３．０）の廻り
に約５０ｍｍの厚さに掻型造型用組成物を充填し、その
上に、先のフェノール樹脂で混練した掻型造型用組成物
を充填し注湯用試験鋳型を作製した。又、鋳型強度測定
の為、先のフェノール樹脂で充填済みの５０φ×５０ｍ
ｍの圧縮強さ測定用木型に充填し、鋳型試験片を作製し
た。そして、鋳型試験片を２５℃での経時圧縮強さを測
定し、又、注湯試験用鋳型を用いて銅合金（ＣＡＣ−４
０３）の鋳込みを行い鋳物を検証した。得られた結果を
表１に示す。(Example 1) 2 parts by weight of a phenol resin (solid content: 50%, water content: 50%) and 100% by weight of a natural silica sand having an AFS particle size index of 35 (type: Onsen Tsu No. 5 silica sand), and a curing agent (ethylene) Glycol diacetate) and 0.4% by weight of water were added and mixed to prepare a composition for scrap molding, and the thickness was 30 cm on a wooden plate having an angle of 45 ° and 50 × 100 cm. Stacked. Also, to measure the strength of the mold, a wooden mold for measuring the compressive strength of 50φ × 50mm is about 3/4.
Up to the height. Next, 3% by weight of water glass (molar ratio 2.5, degree of Baume 48), 0.45% by weight of hardener (ethylene glycol diacetate), and 0.7% by weight of water, based on 100 parts of sand The composition for scrap molding was prepared by adding and mixing. Then, the composition was stacked to a thickness of 10 cm on the composition for shaping mold previously stacked. Then, a triangular plate having an angle of 45 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately, 500φ × 1
A composition for scrap molding is filled to a thickness of about 50 mm around a 00 mm casting mold (S / M ratio, 3.0), and the scrap mold is kneaded with the above phenol resin. The casting composition was filled to prepare a test mold for pouring. Also, for measuring the strength of the mold, 50φ × 50m filled with the phenol resin
m was filled into a mould for measuring compressive strength to prepare a mold test piece. Then, the compressive strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-4) was cast using a casting test mold.
03) was cast to verify the casting. Table 1 shows the obtained results.
【００１４】（実施例２）ＡＦＳ粒度指数３５の天然珪
砂(種類：温泉津５号珪砂)１００部に対して、フェノー
ル樹脂（固形分５０％、水分５０％）を２重量％、硬化
剤（エチレングリコールジアセテート）を０．４重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整し、角度６０°、５０×１００ｃｍの、木製の板の
上に厚さ３０ｃｍに積み重ねた。又、鋳型強度測定の
為、５０φ×５０ｍｍの圧縮強さ測定用木型に約３／４
の高さまで充填した。次に、砂１００部に対して、水ガ
ラス（モル比２．５、ボーメ度４８）を３重量％、硬化
剤（エチレングリコールジアセテート）を０．４５重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整した。そして、先に積み重ねた掻型造型用組成物の
上に厚さ１０ｃｍに積み重ねた。そして、角度６０°の
三角形の板を両脇に置き、掻板で掻型造型用組成物を掻
き、掻型特性を確認した。これとは別に、５００φ×１
００ｍｍの鋳物作製用木型（Ｓ／Ｍ比、３．０）の廻り
に約５０ｍｍの厚さに掻型造型用組成物を充填し、その
上に、先のフェノール樹脂で混練した掻型造型用組成物
を充填し注湯用試験鋳型を作製した。又、鋳型強度測定
の為、先のフェノール樹脂で充填済みの５０φ×５０ｍ
ｍの圧縮強さ測定用木型に充填し、鋳型試験片を作製し
た。そして、鋳型試験片を２５℃での経時圧縮強さを測
定し、又、注湯試験用鋳型を用いて銅合金（ＣＡＣ−４
０３）の鋳込みを行い鋳物を検証した。得られた結果を
表１に示す。(Example 2) 2 parts by weight of a phenol resin (solid content: 50%, water content: 50%) and 100% by weight of a natural silica sand having an AFS particle size index of 35 (type: Onsen Tsu No. 5 silica sand), and a curing agent (ethylene) Glycol diacetate) and 0.4% by weight of water were added and mixed to prepare a composition for scraping molding. The thickness was 30 cm on a wooden plate having an angle of 60 ° and 50 × 100 cm. Stacked. Also, to measure the strength of the mold, a wooden mold for measuring the compressive strength of 50φ × 50mm is about 3/4.
Up to the height. Next, 3% by weight of water glass (molar ratio 2.5, degree of Baume 48), 0.45% by weight of hardener (ethylene glycol diacetate), and 1.4% by weight of water, based on 100 parts of sand. The composition for scrap molding was prepared by adding and mixing. Then, the composition was stacked to a thickness of 10 cm on the composition for shaping mold previously stacked. Then, a triangular plate having an angle of 60 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately, 500φ × 1
A composition for scrap molding is filled to a thickness of about 50 mm around a 00 mm casting mold (S / M ratio, 3.0), and the scrap mold is kneaded with the above phenol resin. The casting composition was filled to prepare a test mold for pouring. Also, for measuring the strength of the mold, 50φ × 50m filled with the phenol resin
m was filled into a mould for measuring compressive strength to prepare a mold test piece. Then, the compressive strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-4) was cast using a casting test mold.
03) was cast to verify the casting. Table 1 shows the obtained results.
【００１５】（実施例３）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を３重量％、硬
化剤（エチレングリコールジアセテート）を０．６重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整し、角度９０°、５０×１００ｃｍの、木製の板の
上に厚さ３０ｃｍに積み重ねた。又、鋳型強度測定の
為、５０φ×５０ｍｍの圧縮強さ測定用木型に約３／４
の高さまで充填した。次に、砂１００部に対して、水ガ
ラス（モル比２．５、ボーメ度４８）を３重量％、硬化
剤（エチレングリコールジアセテート）を０．４５重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整した。そして、先に積み重ねた掻型造型用組成物の
上に厚さ１０ｃｍに積み重ねた。そして、角度９０°の
四角形の板を両脇に置き、掻板で掻型造型用組成物を掻
き、掻型特性を確認した。これとは別に、５００φ×１
００ｍｍの鋳物作製用木型（Ｓ／Ｍ比、３．０）の廻り
に約５０ｍｍの厚さに掻型造型用組成物を充填し、その
上に、先のフェノール樹脂で混練した掻型造型用組成物
を充填し注湯用試験鋳型を作製した。又、鋳型強度測定
の為、先のフェノール樹脂で充填済みの５０φ×５０ｍ
ｍの圧縮強さ測定用木型に充填し、鋳型試験片を作製し
た。そして、鋳型試験片を２５℃での経時圧縮強さを測
定し、又、注湯試験用鋳型を用いて銅合金（ＣＡＣ−４
０３）の鋳込みを行い鋳物を検証した。得られた結果を
表１に示す。(Example 3) 3 parts by weight of a phenolic resin (solid content: 50%, water content: 50%) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (kind: Yunotsu No. 5 silica sand), and a curing agent (ethylene) was used. Glycol diacetate) and 0.6% by weight of water were added and mixed to prepare a composition for scraping molding. The angle was 90 °, 50 × 100 cm, a thickness of 30 cm on a wooden plate. Stacked. Also, to measure the strength of the mold, a wooden mold for measuring the compressive strength of 50φ × 50mm is about 3/4.
Up to the height. Next, 3% by weight of water glass (molar ratio 2.5, degree of Baume 48), 0.45% by weight of hardener (ethylene glycol diacetate), and 1.4% by weight of water, based on 100 parts of sand. The composition for scrap molding was prepared by adding and mixing. Then, the composition was stacked to a thickness of 10 cm on the composition for shaping mold previously stacked. Then, a square plate having an angle of 90 ° was placed on both sides, and the composition for mold making was scraped with a scraper to check the scraping properties. Separately, 500φ × 1
A composition for scrap molding is filled to a thickness of about 50 mm around a 00 mm casting mold (S / M ratio, 3.0), and the scrap mold is kneaded with the phenol resin. The filling composition was filled to prepare a test mold for pouring. Also, for measuring the mold strength, 50φ × 50m filled with the phenol resin
m was filled into a mould for measuring compressive strength to prepare a mold test piece. Then, the compressive strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-4
03) was cast and the casting was verified. Table 1 shows the obtained results.
【００１６】（実施例４）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を２重量％、硬
化剤（エチレングリコールジアセテート）を０．４重量
％、水を０．７重量％添加混合して掻型造型用組成物を
調整し、角度４５°、５０×１００ｃｍの、木製の板の
上に厚さ３０ｃｍに積み重ねた。又、鋳型強度測定の
為、５０φ×５０ｍｍの圧縮強さ測定用木型に約３／４
の高さまで充填した。次に、砂１００部に対して、水ガ
ラス（モル比２．５、ボーメ度４８）を８重量％、硬化
剤ダイカルシウムシリケートを２重量％、水を０．７重
量％添加混合して掻型造型用組成物を調整した。そし
て、先に積み重ねた掻型造型用組成物の上に厚さ１０ｃ
ｍに積み重ねた。そして、角度４５°の三角形の板を両
脇に置き、掻板で掻型造型用組成物を掻き、掻型特性を
確認した。これとは別に、５００φ×１００ｍｍの鋳物
作製用木型（Ｓ／Ｍ比、３．０）の廻りに約５０ｍｍの
厚さに掻型造型用組成物を充填し、その上に、先のフェ
ノール樹脂で混練した掻型造型用組成物を充填し注湯用
試験鋳型を作製した。又、鋳型強度測定の為、先のフェ
ノール樹脂で充填済みの５０φ×５０ｍｍの圧縮強さ測
定用木型に充填し、鋳型試験片を作製した。そして、鋳
型試験片を２５℃での経時圧縮強さを測定し、又、注湯
試験用鋳型を用いて銅合金（ＣＡＣ−４０３）の鋳込み
を行い鋳物を検証した。得られた結果を表１に示す。(Example 4) 2 parts by weight of a phenol resin (solid content: 50%, water content: 50%) and curing agent (ethylene) were added to 100 parts of natural silica sand having an AFS particle size index of 35 (type: Yuzuzu No. 5 silica sand). Glycol diacetate) and 0.4% by weight of water were added and mixed to prepare a composition for scrap molding, and the thickness was 30 cm on a wooden plate having an angle of 45 ° and 50 × 100 cm. Stacked. Also, to measure the strength of the mold, a wooden mold for measuring the compressive strength of 50φ × 50mm is about 3/4.
Up to the height. Next, 8% by weight of water glass (molar ratio 2.5, Baume degree 48), 2% by weight of hardener dicalcium silicate, and 0.7% by weight of water were added to 100 parts of sand and mixed. A composition for molding was prepared. Then, a thickness of 10 c is placed on the previously stacked composition for mold making.
m. Then, a triangular plate having an angle of 45 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately, around a 500 mm × 100 mm casting mold (S / M ratio, 3.0), a composition for scrap molding is filled to a thickness of about 50 mm. A test mold for pouring was prepared by filling the composition for shaping mold kneaded with a resin. In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement which had been filled with the phenol resin. Then, the compression strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 1 shows the obtained results.
【００１７】（実施例５）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を２重量％、硬
化剤（エチレングリコールジアセテート）を０．４重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整し、角度６０°、５０×１００ｃｍの、木製の板の
上に厚さ３０ｃｍに積み重ねた。又、鋳型強度測定の
為、５０φ×５０ｍｍの圧縮強さ測定用木型に約３／４
の高さまで充填した。次に、砂１００部に対して、水ガ
ラス（モル比２．５、ボーメ度４８）を８重量％、硬化
剤ダイカルシウムシリケートを２重量％、水を１．４重
量％添加混合して掻型造型用組成物を調整した。そし
て、先に積み重ねた掻型造型用組成物の上に厚さ１０ｃ
ｍに積み重ねた。そして、角度６０°の三角形の板を両
脇に置き、掻板で掻型造型用組成物を掻き、掻型特性を
確認した。これとは別に、５００φ×１００ｍｍの鋳物
作製用木型（Ｓ／Ｍ比、３．０）の廻りに約５０ｍｍの
厚さに掻型造型用組成物を充填し、その上に、先のフェ
ノール樹脂で混練した掻型造型用組成物を充填し注湯用
試験鋳型を作製した。又、鋳型強度測定の為、先のフェ
ノール樹脂で充填済みの５０φ×５０ｍｍの圧縮強さ測
定用木型に充填し、鋳型試験片を作製した。そして、鋳
型試験片を２５℃での経時圧縮強さを測定し、又、注湯
試験用鋳型を用いて銅合金（ＣＡＣ−４０３）の鋳込み
を行い鋳物を検証した。得られた結果を表１に示す。(Example 5) 2 parts by weight of a phenol resin (solid content: 50%, water content: 50%) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (kind: Yunotsu No. 5 silica sand), and a curing agent (ethylene) was used. Glycol diacetate) and 0.4% by weight of water were added and mixed to prepare a composition for scraping molding. The thickness was 30 cm on a wooden plate having an angle of 60 ° and 50 × 100 cm. Stacked. Also, to measure the strength of the mold, a wooden mold for measuring the compressive strength of 50φ × 50mm is about 3/4.
Up to the height. Next, 8% by weight of water glass (molar ratio 2.5, degree of Baume 48), 2% by weight of hardener dicalcium silicate, and 1.4% by weight of water were added to 100 parts of sand, and the mixture was mixed and scratched. A composition for molding was prepared. Then, a thickness of 10 c is placed on the previously stacked composition for mold making.
m. Then, a triangular plate having an angle of 60 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately, around a 500 mm × 100 mm casting mold (S / M ratio, 3.0), a composition for scrap molding is filled to a thickness of about 50 mm. A test mold for pouring was prepared by filling the composition for shaping mold kneaded with a resin. In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement which had been filled with the phenol resin. Then, the compression strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 1 shows the obtained results.
【００１８】（実施例６）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を３重量％、硬
化剤（エチレングリコールジアセテート）を０．６重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整し、角度９０°、５０×１００ｃｍの、木製の板の
上に厚さ３０ｃｍに積み重ねた。又、鋳型強度測定の
為、５０φ×５０ｍｍの圧縮強さ測定用木型に約３／４
の高さまで充填した。次に、砂１００部に対して、水ガ
ラス（モル比２．５、ボーメ度４８）を８重量％、硬化
剤ダイカルシウムシリケートを２重量％、水を１．４重
量％添加混合して掻型造型用組成物を調整した。そし
て、先に積み重ねた掻型造型用組成物の上に厚さ１０ｃ
ｍに積み重ねた。そして、角度９０°の四角形の板を両
脇に置き、掻板で掻型造型用組成物を掻き、掻型特性を
確認した。これとは別に、５００φ×１００ｍｍの鋳物
作製用木型（Ｓ／Ｍ比、３．０）の廻りに約５０ｍｍの
厚さに掻型造型用組成物を充填し、その上に、先のフェ
ノール樹脂で混練した掻型造型用組成物を充填し注湯用
試験鋳型を作製した。又、鋳型強度測定の為、先のフェ
ノール樹脂で充填済みの５０φ×５０ｍｍの圧縮強さ測
定用木型に充填し、鋳型試験片を作製した。そして、鋳
型試験片を２５℃での経時圧縮強さを測定し、又、注湯
試験用鋳型を用いて銅合金（ＣＡＣ−４０３）の鋳込み
を行い鋳物を検証した。得られた結果を表１に示す。EXAMPLE 6 3 parts by weight of a phenol resin (solid content 50%, water content 50%) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (kind: Yunotsu No. 5 silica sand), and a curing agent (ethylene) was used. Glycol diacetate) and 0.6% by weight of water were added and mixed to prepare a composition for scraping molding. The angle was 90 °, 50 × 100 cm, a thickness of 30 cm on a wooden plate. Stacked. Also, to measure the strength of the mold, a wooden mold for measuring the compressive strength of 50φ × 50mm is about 3/4.
Up to the height. Next, 8% by weight of water glass (molar ratio 2.5, degree of Baume 48), 2% by weight of hardener dicalcium silicate, and 1.4% by weight of water were added to 100 parts of sand, and the mixture was mixed and scratched. A composition for molding was prepared. Then, a thickness of 10 c is placed on the previously stacked composition for mold making.
m. Then, a square plate having an angle of 90 ° was placed on both sides, and the composition for mold making was scraped with a scraper to check the scraping properties. Separately, around a 500 mm × 100 mm casting mold (S / M ratio, 3.0), a composition for scrap molding is filled to a thickness of about 50 mm. A test mold for pouring was prepared by filling the composition for shaping mold kneaded with a resin. In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement which had been filled with the phenol resin. Then, the compression strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 1 shows the obtained results.
【００１９】（比較例１）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を２重量％、硬
化剤（エチレングリコールジアセテート）を０．４重量
％、水を０．７重量％添加混合して掻型造型用組成物を
調整し、角度４５°、５０×１００ｃｍの、木製の板の
上に厚さ４０ｃｍに積み重ねた。そして、角度４５°の
三角形の板を両脇に置き、掻板で掻型造型用組成物を掻
き、掻型特性を確認した。これとは別に、５００φ×１
００ｍｍの鋳物作製用木型（Ｓ／Ｍ比、３．０）に掻型
造型用組成物を充填し、注湯用試験鋳型を作製した。
又、鋳型強度測定の為、５０φ×５０ｍｍの圧縮強さ測
定用木型に充填し、鋳型試験片を作製した。そして、鋳
型試験片を２５℃での経時圧縮強さを測定し、又、注湯
試験用鋳型を用いて銅合金（ＣＡＣ−４０３）の鋳込み
を行い鋳物を検証した。得られた結果を表２に示す。Comparative Example 1 2 parts by weight of a phenol resin (solid content: 50%, water content: 50%) and 100% by weight of a natural silica sand having an AFS particle size index of 35 (type: Yuzuzu No. 5 silica sand), and a curing agent (ethylene) Glycol diacetate) and 0.4% by weight of water were added and mixed to prepare a composition for mold making. The angle was 45 ° and the thickness was 40 cm on a wooden plate of 50 × 100 cm. Stacked. Then, a triangular plate having an angle of 45 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately, 500φ × 1
A 00 mm wooden mold (S / M ratio, 3.0) for casting was filled with the scrap mold composition to prepare a test mold for pouring.
In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement to prepare a mold test piece. Then, the compression strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 2 shows the obtained results.
【００２０】（比較例２）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を２重量％、硬
化剤（エチレングリコールジアセテート）を０．４重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整し、角度６０°、５０×１００ｃｍの、木製の板の
上に厚さ４０ｃｍに積み重ねた。そして、角度６０°の
三角形の板を両脇に置き、掻板で掻型造型用組成物を掻
き、掻型特性を確認した。これとは別に、５００φ×１
００ｍｍの鋳物作製用木型（Ｓ／Ｍ比、３．０）に掻型
造型用組成物を充填し、注湯用試験鋳型を作製した。
又、鋳型強度測定の為、５０φ×５０ｍｍの圧縮強さ測
定用木型に充填し、鋳型試験片を作製した。そして、鋳
型試験片を２５℃での経時圧縮強さを測定し、又、注湯
試験用鋳型を用いて銅合金（ＣＡＣ−４０３）の鋳込み
を行い鋳物を検証した。得られた結果を表２に示す。Comparative Example 2 2 parts by weight of a phenolic resin (solid content 50%, water content 50%) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (type: Yunotsu No. 5 silica sand), and a curing agent (ethylene) was used. Glycol diacetate) and 0.4% by weight of water were added and mixed to prepare a composition for scraping molding. The angle was 60 °, 50 × 100 cm, and the thickness was 40 cm on a wooden plate. Stacked. Then, a triangular plate having an angle of 60 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately, 500φ × 1
A 00 mm wooden mold (S / M ratio, 3.0) for casting was filled with the scrap mold composition to prepare a test mold for pouring.
In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement to prepare a mold test piece. Then, the compression strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 2 shows the obtained results.
【００２１】（比較例３）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、フェノ
ール樹脂（固形分５０％、水分５０％）を３重量％、硬
化剤（エチレングリコールジアセテート）を０．６重量
％、水を１．４重量％添加混合して掻型造型用組成物を
調整し、角度９０°、５０×１００ｃｍの、木製の板の
上に厚さ４０ｃｍに積み重ねた。そして、角度９０°の
四角形の板を両脇に置き、掻板で掻型造型用組成物を掻
き、掻型特性を確認した。これとは別に、５００φ×１
００ｍｍの鋳物作製用木型（Ｓ／Ｍ比、３．０）に掻型
造型用組成物を充填し、注湯用試験鋳型を作製した。
又、鋳型強度測定の為、５０φ×５０ｍｍの圧縮強さ測
定用木型に充填し、鋳型試験片を作製した。そして、鋳
型試験片を２５℃での経時圧縮強さを測定し、又、注湯
試験用鋳型を用いて銅合金（ＣＡＣ−４０３）の鋳込み
を行い鋳物を検証した。得られた結果を表２に示す。(Comparative Example 3) A phenol resin (solid content: 50%, water content: 50%) was added at 3% by weight to a natural silica sand having an AFS particle size index of 35 (type: Yuzuzu No. 5 silica sand), and a curing agent (ethylene) was used. Glycol diacetate) and water at 1.4% by weight were added and mixed to prepare a composition for scraping molding, and an angle of 90 °, 50 × 100 cm, a thickness of 40 cm on a wooden plate. Stacked. Then, a square plate having an angle of 90 ° was placed on both sides, and the composition for mold making was scraped with a scraper to check the scraping properties. Separately, 500φ × 1
A 00 mm wooden mold (S / M ratio, 3.0) for casting was filled with the scrap mold composition to prepare a test mold for pouring.
In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement to prepare a mold test piece. Then, the compression strength over time of the mold test piece at 25 ° C. was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 2 shows the obtained results.
【００２２】（比較例４）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、水ガラ
ス（モル比２．５、ボーメ度４８）を８重量％、硬化剤
（ダイカルシウムシリケート）を２重量％、水を０．７
重量％添加混合して掻型造型用組成物を調整し、角度４
５°、５０×１００ｃｍの、木製の板の上に厚さ４０ｃ
ｍに積み重ねた。そして、角度４５°の三角形の板を両
脇に置き、掻板で掻型造型用組成物を掻き、掻型特性を
確認した。これとは別に、５００φ×１００ｍｍの鋳物
作製用木型（Ｓ／Ｍ比、３．０）に掻型造型用組成物を
充填し、注湯用試験鋳型を作製した。又、鋳型強度測定
の為、５０φ×５０ｍｍの圧縮強さ測定用木型に充填
し、鋳型試験片を作製した。そして、鋳型試験片を２５
℃での経時圧縮強さを測定し、又、注湯試験用鋳型を用
いて銅合金（ＣＡＣ−４０３）の鋳込みを行い鋳物を検
証した。得られた結果を表２に示す。(Comparative Example 4) 8 parts by weight of water glass (molar ratio 2.5, Baume degree 48) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (type: Yuzu No.5 silica sand), and a hardener ( 2% by weight of dicalcium silicate) and 0.7% of water
By weight addition and mixing, the composition for scrap molding was adjusted, and the angle 4 was adjusted.
5 °, 50x100cm, 40c thick on wooden board
m. Then, a triangular plate having an angle of 45 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately from this, a 500 mm × 100 mm wooden mold for casting (S / M ratio, 3.0) was filled with the composition for scrap molding to prepare a test mold for pouring. In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement to prepare a mold test piece. And, the mold test piece is 25
The compressive strength over time at ℃ was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 2 shows the obtained results.
【００２３】（比較例５）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、水ガラ
ス（モル比２．５、ボーメ度４８）を８重量％、硬化剤
（ダイカルシウムシリケート）を２重量％、水を１．４
重量％添加混合して掻型造型用組成物を調整し、角度６
０°、５０×１００ｃｍの、木製の板の上に厚さ４０ｃ
ｍに積み重ねた。そして、角度６０°の三角形の板を両
脇に置き、掻板で掻型造型用組成物を掻き、掻型特性を
確認した。これとは別に、５００φ×１００ｍｍの鋳物
作製用木型（Ｓ／Ｍ比、３．０）に掻型造型用組成物を
充填し、注湯用試験鋳型を作製した。又、鋳型強度測定
の為、５０φ×５０ｍｍの圧縮強さ測定用木型に充填
し、鋳型試験片を作製した。そして、鋳型試験片を２５
℃での経時圧縮強さを測定し、又、注湯試験用鋳型を用
いて銅合金（ＣＡＣ−４０３）の鋳込みを行い鋳物を検
証した。得られた結果を表２に示す。Comparative Example 5 8 parts by weight of water glass (molar ratio: 2.5, Baume degree: 48) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (kind: Yunotsu No. 5 silica sand), and a curing agent ( 2% by weight of dicalcium silicate) and 1.4% of water
% By weight and mixed to prepare a composition for scraping molding.
0 °, 50x100cm, 40c thick on wooden board
m. Then, a triangular plate having an angle of 60 ° was placed on both sides, and the composition for mold making was scraped with a scraper, and the scraping characteristics were confirmed. Separately from this, a 500 mm × 100 mm wooden mold for casting (S / M ratio, 3.0) was filled with the composition for scrap molding to prepare a test mold for pouring. In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement to prepare a mold test piece. And, the mold test piece is 25
The compressive strength over time at ℃ was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 2 shows the obtained results.
【００２４】（比較例６）ＡＦＳ粒度指数３５の天然珪
砂（種類：温泉津５号珪砂）１００部に対して、水ガラ
ス（モル比２．５、ボーメ度４８）を８重量％、硬化剤
（ダイカルシウムシリケート）を２重量％、水を１．４
重量％添加混合して掻型造型用組成物を調整し、角度９
０°、５０×１００ｃｍの、木製の板の上に厚さ４０ｃ
ｍに積み重ねた。そして、角度９０°の四角形の板を両
脇に置き、掻板で掻型造型用組成物を掻き、掻型特性を
確認した。これとは別に、５００φ×１００ｍｍの鋳物
作製用木型（Ｓ／Ｍ比、３．０）に掻型造型用組成物を
充填し、注湯用試験鋳型を作製した。又、鋳型強度測定
の為、５０φ×５０ｍｍの圧縮強さ測定用木型に充填
し、鋳型試験片を作製した。そして、鋳型試験片を２５
℃での経時圧縮強さを測定し、又、注湯試験用鋳型を用
いて銅合金（ＣＡＣ−４０３）の鋳込みを行い鋳物を検
証した。得られた結果を表２に示す。(Comparative Example 6) 8 parts by weight of water glass (molar ratio: 2.5, Baume degree: 48) was added to 100 parts of natural silica sand having an AFS particle size index of 35 (type: Onsen Tsu No. 5 silica sand), and a curing agent ( 2% by weight of dicalcium silicate) and 1.4% of water
By weight addition and mixing, the composition for scrap molding was prepared, and the angle 9
0 °, 50x100cm, 40c thick on wooden board
m. Then, a square plate having an angle of 90 ° was placed on both sides, and the composition for mold making was scraped with a scraper to check the scraping properties. Separately from this, a 500 mm × 100 mm wooden mold for casting (S / M ratio, 3.0) was filled with the composition for scrap molding to prepare a test mold for pouring. In order to measure the mold strength, the mold was filled in a 50 mm × 50 mm wooden mold for compressive strength measurement to prepare a mold test piece. And, the mold test piece is 25
The compressive strength over time at ℃ was measured, and a copper alloy (CAC-403) was cast using a casting test mold to verify the casting. Table 2 shows the obtained results.
【００２５】[0025]
【表１】実施例の試験結果 [Table 1] Test results of Examples
【００２６】[0026]
【表２】比較例の試験結果 [Table 2] Test results of comparative examples
【００２７】[0027]
【発明の効果】前述の実施例で明白な様に、本発明の掻
型造型用組成物を使用すれば、鋳型の崩壊性と砂再生を
重視する鋳型の大部分を有機系粘結剤であるフェノール
樹脂を使用した鋳型とし、その優れた接着性と、砂に添
加した水の持つ表面張力による結合性により、少ない添
加量で、鋳型強度が高く、掻型特性良好な掻型造型用組
成物を得ることが出来る。又、無機系粘結剤である水ガ
ラスを溶湯に接触する肌面に限定使用する事により、有
機系粘結剤のフェノール樹脂の欠点である有機ガスによ
る鋳造欠陥を大幅に低減する事が可能となった。更に、
これらの相乗効果により、高い砂再生率を得る事をも可
能となるのである。そして、この様にして形成された鋳
型は、造型時における作業性低下を招く事なく、ガス欠
陥が発生し易い船舶用の大型銅合金プロペラには、極め
て効果的な造型方法となる。以上の説明からも明らかな
ように、作業環境の改善、鋳物のガス欠陥、砂の回収や
再利用による生産コストの削減、鋳物の歩留向上に効果
的である。As is clear from the above-mentioned examples, when the composition for mold making of the present invention is used, most of the molds which emphasize the disintegration of the mold and the regeneration of sand are made of an organic binder. A mold that uses a certain phenolic resin, and due to its excellent adhesiveness and bondability due to the surface tension of the water added to the sand, a small amount of addition, high mold strength and good scraping properties. You can get things. Also, by using water glass, which is an inorganic binder, only on the skin surface that comes into contact with the molten metal, it is possible to greatly reduce casting defects due to organic gas, which is a drawback of phenol resin as an organic binder. It became. Furthermore,
These synergistic effects also make it possible to obtain a high sand recycling rate. The mold thus formed is an extremely effective molding method for large copper alloy propellers for ships, in which gas defects are likely to occur, without lowering workability during molding. As is clear from the above description, it is effective in improving the working environment, reducing gas costs in castings, reducing production costs by collecting and reusing sand, and improving the yield of castings.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２２Ｃ 9/12 Ｂ２２Ｃ 9/12 Ｚ 9/22 9/22 Ｃ (72)発明者 伊藤 智幸 群馬県高崎市宿大類町700番地 群栄化学 工業株式会社内 Ｆターム(参考） 4E092 AA02 AA11 AA18 AA19 AA26 AA45 BA09 BA11 BA12 BA20 CA03 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) B22C 9/12 B22C 9/12 Z 9/22 9/22 C (72) Inventor Tomoyuki Ito Takasaki City, Gunma Prefecture 700 Shukudaidaicho Gunei Chemical Industry Co., Ltd. F-term (reference) 4E092 AA02 AA11 AA18 AA19 AA26 AA45 BA09 BA11 BA12 BA20 CA03
Claims (9)
て掻型造型を行う方法において、粘結剤として、溶湯と
の接触面に無機系粘結剤を使用し、溶湯との非接触部分
に有機系粘結剤を使用する事を特徴とする、掻型造型用
組成物。Claims: 1. A method for carrying out scraping molding using a composition comprising aggregate, water and a binder, wherein an inorganic binder is used as a binder on a contact surface with the molten metal, and A composition for scrap molding, wherein an organic binder is used in a non-contact portion of the composition.
分濃度２０〜８０重量％のエステル硬化フェノールホル
ムアルデヒド樹脂を、使用する砂に対して、０．５〜４
重量％、水を０．２５〜４重量％添加する掻型造型用組
成物。2. The organic binder according to claim 1, wherein an ester-cured phenol formaldehyde resin having a solid content of 20 to 80% by weight is used in an amount of 0.5 to 4 with respect to the sand used.
A composition for scraping molding, to which 0.25 to 4% by weight of water is added.
分濃度が２０〜７０重量％、モル比１．６〜４（ＳｉＯ
２／Ｍ、Ｍ＝Ｋ２Ｏ、Ｎａ２Ｏ）、ボーメ度３４〜５８
（２０℃）の水ガラスを、使用する砂に対して、１〜８
重量％、水を０．２５〜４重量％添加する掻型造型用組
成物。3. The inorganic binder according to claim 1, which has a solid content of 20 to 70% by weight and a molar ratio of 1.6 to 4 (SiO 2
2 / M, M = K 2 O, Na 2 O), degree Baume 34-58
(20 ° C.) water glass, 1-8
A composition for scraping molding, to which 0.25 to 4% by weight of water is added.
て掻型造型を行う方法において、粘結剤として、溶湯と
の接触面に無機系粘結剤を使用し、溶湯との非接触部分
に有機系粘結剤を使用する事を特徴とする、掻型造型用
鋳型の形成方法。4. A method of performing a mold making using a composition comprising an aggregate, water and a binder, wherein an inorganic binder is used as a binder on a contact surface with the molten metal, and Using an organic binder in the non-contact portion of the mold.
分濃度２０〜８０重量％のエステル硬化フェノールホル
ムアルデヒド樹脂を、使用する砂に対して、０．５〜４
重量％、水を０．２５〜４重量％添加する掻型造型用鋳
型の形成方法。5. The organic binder according to claim 4, wherein an ester-cured phenol formaldehyde resin having a solid content of 20 to 80% by weight is added to the sand to be used in an amount of 0.5 to 4%.
A method for forming a mold for scraping molding, wherein 0.25 to 4% by weight of water and 0.25 to 4% by weight of water are added.
分濃度２０〜７０重量％、モル比１．６〜４（ＳｉＯ２
／Ｍ、Ｍ＝Ｋ２Ｏ、Ｎａ２Ｏ）、ボーメ度３４〜５８
（２０℃）の水ガラスを、使用する砂に対して、１〜８
重量％、水を０．２５〜４重量％添加する掻型造型用鋳
型の形成方法。6. The inorganic binder according to claim 4, wherein the solid content is 20 to 70% by weight and the molar ratio is 1.6 to 4 (SiO 2
/ M, M = K 2 O , Na 2 O), degree Baume 34-58
(20 ° C.) water glass, 1-8
A method for forming a mold for scraping molding, wherein 0.25 to 4% by weight of water and 0.25 to 4% by weight of water are added.
び無機系粘結剤を硬化させる方法にあって、エステル類
を使用する砂に対して、０．０８〜１．６重量％添加す
る掻型造型用鋳型の形成方法。7. The method for curing an organic binder and an inorganic binder according to claim 5 and 6, wherein the binder is used in an amount of 0.08 to 1.6 wt. % A method for forming a mold for scrap molding.
法にあって、ダイカルシウムシリケートを使用する砂に
対して、０．５〜５重量％添加する掻型造型用鋳型の形
成方法。8. The method for curing an inorganic binder according to claim 6, wherein 0.5 to 5% by weight is added to sand using dicalcium silicate. .
法にあって、炭酸ガスで硬化させる事を特徴とする掻型
造型用鋳型の形成方法。9. The method for curing an inorganic binder according to claim 6, wherein the inorganic binder is cured with carbon dioxide gas.
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|---|---|---|---|
| JP2000047256A JP2001232442A (en) | 2000-02-24 | 2000-02-24 | Composition for sweeping molding, and forming method for sweeping mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000047256A JP2001232442A (en) | 2000-02-24 | 2000-02-24 | Composition for sweeping molding, and forming method for sweeping mold |
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|---|---|
| JP2001232442A true JP2001232442A (en) | 2001-08-28 |
Family
ID=18569536
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004283859A (en) * | 2003-03-20 | 2004-10-14 | Toyota Motor Corp | Water-soluble core and its manufacturing method |
| JP2005066634A (en) * | 2003-08-22 | 2005-03-17 | Toyota Motor Corp | Water-soluble core binder, water-soluble core, and method for manufacturing the same |
| JP2014117740A (en) * | 2012-12-19 | 2014-06-30 | Asahi Organic Chemicals Industry Co Ltd | Coated sand production method, coated sand obtained by the same, and cast production method |
| WO2016143051A1 (en) * | 2015-03-09 | 2016-09-15 | 技術研究組合次世代３Ｄ積層造形技術総合開発機構 | Granular material, device for producing three-dimensional-laminate moulding mould, and method for producing three-dimensional-laminate moulding mould |
| CN107127291A (en) * | 2017-04-01 | 2017-09-05 | 东风精密铸造安徽有限公司 | A kind of water-glass sand core formula of moltening mold castings |
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2000
- 2000-02-24 JP JP2000047256A patent/JP2001232442A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004283859A (en) * | 2003-03-20 | 2004-10-14 | Toyota Motor Corp | Water-soluble core and its manufacturing method |
| JP2005066634A (en) * | 2003-08-22 | 2005-03-17 | Toyota Motor Corp | Water-soluble core binder, water-soluble core, and method for manufacturing the same |
| JP2014117740A (en) * | 2012-12-19 | 2014-06-30 | Asahi Organic Chemicals Industry Co Ltd | Coated sand production method, coated sand obtained by the same, and cast production method |
| WO2016143051A1 (en) * | 2015-03-09 | 2016-09-15 | 技術研究組合次世代３Ｄ積層造形技術総合開発機構 | Granular material, device for producing three-dimensional-laminate moulding mould, and method for producing three-dimensional-laminate moulding mould |
| JP6027264B1 (en) * | 2015-03-09 | 2016-11-16 | 技術研究組合次世代３Ｄ積層造形技術総合開発機構 | Granular material, three-dimensional additive manufacturing mold manufacturing apparatus, and three-dimensional additive manufacturing mold manufacturing method |
| CN107127291A (en) * | 2017-04-01 | 2017-09-05 | 东风精密铸造安徽有限公司 | A kind of water-glass sand core formula of moltening mold castings |
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