JP3453461B2 - Mold molding method and mold composition - Google Patents
Mold molding method and mold compositionInfo
- Publication number
- JP3453461B2 JP3453461B2 JP22536195A JP22536195A JP3453461B2 JP 3453461 B2 JP3453461 B2 JP 3453461B2 JP 22536195 A JP22536195 A JP 22536195A JP 22536195 A JP22536195 A JP 22536195A JP 3453461 B2 JP3453461 B2 JP 3453461B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- carbon dioxide
- molding
- resin
- aqueous solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Mold Materials And Core Materials (AREA)
- Biological Depolymerization Polymers (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳造における鋳鋼
の熱間割れの防止（鋳物熱間割れの補修改善）や鋳型の
崩壊性及び砂再生性に優れる鋳型造型方法、及び鋳型組
成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold making method and a mold composition which are excellent in preventing hot cracking of cast steel in casting (improvement of repair of hot cracking in casting), mold collapsibility and sand reclaimability.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】近年、
ガス硬化型有機粘結剤として、作業環境及び鋳物品質の
観点から鋳造業界で炭酸ガス硬化型フェノール樹脂造型
プロセスが注目を集めている。2. Description of the Related Art In recent years,
As a gas-curable organic binder, a carbon dioxide-curable phenol resin molding process has been attracting attention in the casting industry from the viewpoint of work environment and casting quality.
【０００３】その理由として鋳物砂に該粘結剤を混練し
鋳型として造型する場合において毒性の極めて少ない炭
酸ガスを使用することにより作業環境が顕著に良いこと
及び造型速度が極めて速いことが挙げられる。そのた
め、炭酸ガスを通気して鋳型を硬化させる時においても
ホルムアルデヒド臭気が殆どなく、注湯時の環境が極め
て良好である。The reason for this is that when a molding sand is kneaded with the binder and used as a mold, the use of carbon dioxide gas, which has extremely low toxicity, provides a remarkably good working environment and an extremely high molding speed. . Therefore, even when carbon dioxide gas is aerated to cure the mold, there is almost no formaldehyde odor, and the environment during pouring is extremely good.
【０００４】炭酸ガス有機系硬化造型法の中でも特公平
4-76947 号公報にみられるような水溶性フェノール樹脂
タイプのものが造型作業環境、造型生産性が優れ、鋳造
後の鋳物を取り出す場合、鋳型バラシ時の鋳型崩壊性が
非常に良いとの理由により一層普及しつつある。特に、
生型中子に使用されたり、アルカリ性の水溶性フェノー
ル／有機エステル硬化法の主型の中子として汎用的に使
用されている。しかし、その反面通常のフラン造型プロ
セスよりも改善は認められるものの、鋳鋼を鋳造した鋳
物の熱間割れが発生したりする場合があり、決して満足
する造型プロセスではない。Special fairness among carbon dioxide organic curing molding methods
The reason why the water-soluble phenolic resin type as shown in Japanese Patent No. 4-76947 has excellent molding work environment and molding productivity, and when the cast product is taken out after casting, the mold collapse property at the time of separating the mold is very good. Is becoming more popular. In particular,
It is used for green cores and is generally used as the main core for alkaline water-soluble phenol / organic ester curing method. However, on the other hand, although an improvement can be recognized as compared with the usual furan molding process, hot cracking of a cast product of cast steel may occur, which is by no means a satisfactory molding process.
【０００５】一方、無機系粘結剤として水ガラス（珪酸
アルカリ塩の１種）／CO2 硬化法がある。この造型プロ
セスは注湯時のガス発生が少ないことや、造型コストが
極めて少ないことなどの理由から最も汎用的に用いられ
ているものである。しかし、この造型プロセスは水ガラ
スのため鋳造後の鋳型崩壊性が劣るという最大の欠点を
有し、この鋳物砂を再利用できる可能性、つまり砂再生
性が劣るという欠点があった。On the other hand, as an inorganic binder, there is a water glass (a kind of silicic acid alkali salt) / CO 2 curing method. This molding process is most widely used because of the small amount of gas generated during pouring and the extremely low molding cost. However, this molding process has the greatest drawback that the mold collapsibility after casting is inferior because it is water glass, and there is a possibility that this molding sand can be reused, that is, the sand reproducibility is inferior.
【０００６】[0006]
【課題を解決するための手段】本発明者等は鋭意検討の
結果、有機系水溶性フェノール樹脂と無機系バインダー
である珪酸塩の粘結剤を組み合わせた有機−無機ハイブ
リッド型の粘結剤を使用することで、各々の粘結剤の欠
点を互いに補うことを見出し、前記の課題を解決し、本
発明を完成するに至った。Means for Solving the Problems As a result of intensive studies, the present inventors have found an organic-inorganic hybrid type binder in which an organic water-soluble phenolic resin and an inorganic binder, a silicate binder, are combined. It was found that the use of these binders complements the drawbacks of the respective binders with each other, and the above-mentioned problems have been solved and the present invention has been completed.
【０００７】すなわち、本発明は、鋳物砂に対して、
（ａ）アルカリ性水溶性フェノール系樹脂及び（ｂ）珪
酸アルカリ塩からなる粘結剤組成物を混練して（ｃ）炭
酸ガスで硬化させることを特徴とする鋳型造型方法、及
び該方法によって得られる鋳型組成物に関する。That is, the present invention relates to molding sand
A method for molding a mold, which comprises: (a) kneading a binder composition consisting of an alkaline water-soluble phenolic resin and (b) a silicic acid alkali salt and hardening the mixture with carbon dioxide gas; and a mold-forming method obtained by the method. Template composition.
【０００８】本発明に用いる（ａ）アルカリ性水溶性フ
ェノール系樹脂は、フェノール類、ビスフェノール類等
のフェノール系化合物を大量のアルカリ性物質の存在下
で、ホルムアルデヒド等のアルデヒド類と反応させて得
られるものであり、フェノール類・ホルムアルデヒド樹
脂、ビスフェノール類・ホルムアルデヒド樹脂又はフェ
ノール類・ビスフェノール類・ホルムアルデヒド共縮合
樹脂が挙げられる。また、これらの樹脂には、脂肪族ア
ルコールであるメタノール、エタノール、イソプロピル
アルコール、ノルマルプロピルアルコール、ブチルプロ
ピルアルコール等の１価アルコール化合物を共縮重合又
は混合しても良い。さらに、これらの樹脂には、オキシ
アニオン化合物類であるホウ酸や硼砂、ホウ酸エステル
類等のホウ酸化合物、又はアルミン酸ソーダ等のアルミ
ン酸化合物類やスズ酸ソーダ等のスズ酸化合物類の塩類
等を樹脂の縮合反応時、反応終了後又は炭酸ガス硬化型
粘結剤の溶液調整時に添加して使用することができ、ま
た、これらの化合物類を二種以上添加してもよい。The (a) alkaline water-soluble phenolic resin used in the present invention is obtained by reacting phenolic compounds such as phenols and bisphenols with aldehydes such as formaldehyde in the presence of a large amount of alkaline substances. And phenols / formaldehyde resins, bisphenols / formaldehyde resins or phenols / bisphenols / formaldehyde co-condensation resins. Further, monohydric alcohol compounds such as aliphatic alcohols such as methanol, ethanol, isopropyl alcohol, normal propyl alcohol and butyl propyl alcohol may be copolycondensed or mixed with these resins. Further, these resins include boric acid and borax that are oxyanion compounds, boric acid compounds such as borate esters, or aluminate compounds such as sodium aluminate and stannic acid compounds such as sodium stannate. Salts and the like can be added and used during the condensation reaction of the resin, after the reaction is completed, or when the solution of the carbon dioxide-curable binder is prepared, and two or more kinds of these compounds may be added.
【０００９】アルカリ性物質は、フェノール系化合物に
対して 0.7〜5.0 倍モルの範囲が良く、好ましくは 1.0
〜4.0 倍モルが良好である。アルカリ性物質がフェノー
ル系化合物に対して 0.7倍モル未満では硬化速度と鋳型
強度が不充分であり、一方、アルカリ性物質がフェノー
ル系化合物に対して 5.0倍モルを超えるとアルカリ性が
高くなり過ぎて、作業完全上望ましくない。これらのア
ルカリ性水溶性フェノール系樹脂の製造の際に用いられ
る適当なアルカリ性物質は、水酸化ナトリウム、水酸化
カリウム、水酸化リチウム及びこれらの混合物である
が、水酸化カリウムが最も好ましい。The alkaline substance may be used in a range of 0.7 to 5.0 times the molar amount of the phenolic compound, preferably 1.0.
~ 4.0 times mol is good. If the amount of the alkaline substance is less than 0.7 times the mole of the phenolic compound, the curing speed and the mold strength will be insufficient, while if the amount of the alkaline substance exceeds 5.0 times the mole of the phenolic compound, the alkalinity will be too high. Completely undesirable. Suitable alkaline substances used in the production of these alkaline water-soluble phenolic resins are sodium hydroxide, potassium hydroxide, lithium hydroxide and mixtures thereof, with potassium hydroxide being most preferred.
【００１０】アルデヒド類はフェノール系化合物に対し
て 1.0〜6.0 倍モルの範囲が良く、好ましくは 1.1〜5.
5 倍モルが良好である。アルデヒド類がフェノール系化
合物に対して 1.0倍モル未満ではアルデヒド類とフェノ
ール系化合物の共縮合反応が進みにくくなり、 6.0倍モ
ルを超えると未反応アルデヒドの残存量が多くなる。Aldehydes may be used in a range of 1.0 to 6.0 times mol, preferably 1.1 to 5.
5 times mole is good. If the amount of aldehydes is less than 1.0 times the molar amount of the phenolic compound, the cocondensation reaction between the aldehydes and the phenolic compound will not proceed easily, and if it exceeds 6.0 times the molar amount of the unreacted aldehyde will remain.
【００１１】本発明において、フェノール類としてはフ
ェノール、クレゾール、レゾルシンなどが挙げられ、ビ
スフェノール類としてはビスフェノールＡ、ビスフェノ
ールＦ、ビスフェノールＳ、ビスフェノールＺなどが挙
げられる。フェノール系・ホルムアルデヒド樹脂のフェ
ノール原料として一般的にフェノール類やビスフェノー
ル類を単独で用いたフェノール類・ホルムアルデヒド樹
脂やビスフェノール類・ホルムアルデヒド樹脂、或いは
フェノール類とビスフェノール類を同時に用いたフェノ
ール類・ビスフェノール類・ホルムアルデヒド共縮合樹
脂を調整して、所定の水溶性フェノール系樹脂水溶液を
得るが、本発明で用いる粘結剤組成物としてはビスフェ
ノール類・ホルムアルデヒド樹脂やフェノール類・ビス
フェノール類・ホルムアルデヒド共縮合樹脂の粘結剤が
好ましく、その中でもフェノール・ビスフェノールＡ・
クレゾール・イソプロピルアルコール・ホルムアルデヒ
ドの共縮合樹脂が特に好ましい。その理由は、ビスフェ
ノール類・ホルムアルデヒド樹脂やフェノール類・ビス
フェノール類・ホルムアルデヒド共縮合樹脂の方が通常
のフェノール類単独で合成された水溶性フェノール系樹
脂水溶液よりも更に鋳型強度が高く保持されるためであ
る。フェノール類とビスフェノール類を同時に用いた場
合には、ビスフェノール類はフェノール類に対して0.05
〜99.5倍モルの範囲が好ましく、 0.1〜9.0 倍モルが更
に好ましい。本発明においては、鋳型強度を更に高める
ために、添加剤としてセロソルブ、カルビトール、トリ
エチレングリコールエーテル類等のグリコールエーテル
類を樹脂の反応時又は反応終了時に添加することができ
る。In the present invention, the phenols include phenol, cresol, resorcin, and the like, and the bisphenols include bisphenol A, bisphenol F, bisphenol S, bisphenol Z and the like. In general, phenols and bisphenols are used alone as phenolic raw materials for phenol-formaldehyde resins, formaldehyde resins and bisphenols and formaldehyde resins, or phenols and bisphenols that are used simultaneously with phenols and bisphenols. The formaldehyde co-condensation resin is prepared to obtain a predetermined water-soluble phenolic resin aqueous solution, and the binder composition used in the present invention is a bisphenol-formaldehyde resin or a phenol-bisphenol-formaldehyde co-condensation resin Binders are preferred, among which phenol / bisphenol A /
A cresol / isopropyl alcohol / formaldehyde co-condensation resin is particularly preferred. The reason is that the bisphenols / formaldehyde resin and the phenols / bisphenols / formaldehyde co-condensation resin maintain the mold strength higher than the water-soluble phenolic resin aqueous solution synthesized by ordinary phenols alone. is there. When phenols and bisphenols are used at the same time, bisphenols are
The molar ratio is preferably 9 to 99.5 times, more preferably 0.1 to 9.0 times. In the present invention, glycol ethers such as cellosolve, carbitol, and triethylene glycol ethers can be added as additives during the reaction of the resin or at the end of the reaction in order to further enhance the mold strength.
【００１２】本発明に用いる（ｂ）珪酸アルカリ塩とし
ては、通常、珪酸ナトリウム、珪酸カリウム、珪酸リチ
ウム、珪酸カルシウム、珪酸マグネシウム等が使用で
き、これらの中でも、珪酸ナトリウムや珪酸カリウムが
好ましい。珪酸アルカリ塩の形態としては、粉末状でも
良いし、水溶液でも懸濁液、或いは分散液でも良いが、
水ガラスである珪酸ナトリウムや珪酸カリウム水溶液が
好ましい。更に、これらの混合物でも良い。珪酸アルカ
リ塩の中でも珪酸ナトリウムや珪酸カリウムが好まし
く、その場合、モル比（SiO2／Na2O、SiO2／K2O) 2.0〜
3.2 、ボーメ度35〜60の珪酸塩が良く、更に好ましくは
モル比 2.1〜2.8 、ボーメ度40〜50の範囲が良い。As the alkali silicate (b) used in the present invention, sodium silicate, potassium silicate, lithium silicate, calcium silicate, magnesium silicate and the like can be usually used, and among these, sodium silicate and potassium silicate are preferable. The silicate alkali salt may be in the form of powder, an aqueous solution, a suspension, or a dispersion,
An aqueous solution of sodium silicate or potassium silicate which is water glass is preferable. Further, a mixture of these may be used. Among the alkali silicate salts, sodium silicate and potassium silicate are preferable, in which case the molar ratio (SiO 2 / Na 2 O, SiO 2 / K 2 O) 2.0-
3.2, a silicate having a Baume degree of 35 to 60 is preferable, and a molar ratio of 2.1 to 2.8 and a Baume degree of 40 to 50 are more preferable.
【００１３】本発明の鋳型造型方法は、鋳物砂に対し
て、（ａ）アルカリ性水溶性フェノール系樹脂及び
（ｂ）珪酸アルカリ塩からなる粘結剤組成物を混練して
（ｃ）炭酸ガスで硬化させるものであるが、各成分の配
合量としては、鋳物砂 100重量部に対して、（ａ）アル
カリ性水溶性フェノール系樹脂を0.01〜７重量部、
（ｂ）珪酸アルカリ塩を0.01〜７重量部、（ｃ）炭酸ガ
スを0.01〜30重量部好ましくは 0.1〜20重量部使用する
ことが好ましい。（ａ）アルカリ性水溶性フェノール系
樹脂及び（ｂ）珪酸アルカリ塩からなる粘結剤組成物の
混練方法としては、（ａ）アルカリ性水溶性フェノール
系樹脂の水溶液と（ｂ）珪酸アルカリ塩を予め混合また
は配合、或いは（ａ）アルカリ性水溶性フェノール系樹
脂の水溶液の反応時に（ｂ）珪酸アルカリ塩を添加配合
して所定の鋳物砂に混練して炭酸ガスで硬化させること
が好ましい。In the mold making method of the present invention, (a) an alkaline water-soluble phenolic resin and (b) a binder composition comprising an alkali silicate salt are kneaded with foundry sand and (c) carbon dioxide gas is added. The amount of each component to be hardened is 0.01 to 7 parts by weight of (a) an alkaline water-soluble phenolic resin with respect to 100 parts by weight of molding sand.
It is preferable to use 0.01 to 7 parts by weight of (b) an alkali silicate salt and 0.01 to 30 parts by weight, and preferably 0.1 to 20 parts by weight of (c) carbon dioxide gas. As a method for kneading the binder composition comprising (a) an alkaline water-soluble phenolic resin and (b) an alkali silicate salt, (a) an aqueous solution of an alkaline water-soluble phenolic resin and (b) an alkali silicate salt are mixed in advance. Alternatively, it is preferable to mix or mix (a) an alkaline salt of silicate (b) during the reaction of an aqueous solution of an alkaline water-soluble phenolic resin, knead with a predetermined molding sand, and cure with carbon dioxide gas.
【００１４】本発明に用いる鋳物砂の種類としては輸入
珪砂、国産珪砂、アルミナサンド、ジルコンサンド、ク
ロマイトサンド、合成ムライトサンド（セラビーズ）、
オリビンサンド等の新砂や、金属粉末、金属酸化物粉
末、及び水溶性フェノール樹脂、フラン樹脂、フェノー
ル・ウレタン樹脂、水ガラス、ベントナイト等を粘結剤
として用いた鋳物砂から再生された再生砂も用いること
ができる。また、これらの構成する粒度や粒度分布など
は特に限定されるものではない。さらに、本発明の鋳型
造型法はＶＲＨ造型法や吸圧造型法等の減圧造型法に応
用できるものであり限定するものでなく、その他の造型
法を使用してもよい。The types of foundry sand used in the present invention include imported silica sand, domestic silica sand, alumina sand, zircon sand, chromite sand, synthetic mullite sand (Cera beads),
New sand such as olivine sand, metal powder, metal oxide powder, and reclaimed sand reclaimed from foundry sand using water-soluble phenol resin, furan resin, phenol-urethane resin, water glass, bentonite, etc. as a binder Can be used. Further, the particle size and particle size distribution of these constituents are not particularly limited. Further, the mold molding method of the present invention is applicable to the reduced pressure molding method such as the VRH molding method and the pressure absorption molding method, and is not limited. Other molding methods may be used.
【００１５】また、鋳物砂に（ａ）アルカリ性水溶性フ
ェノール系樹脂及び（ｂ）珪酸アルカリ塩からなる粘結
剤組成物を混練する場合において、更にシランカップリ
ング剤を追加しても差し支えない。When kneading the binder composition comprising (a) an alkaline water-soluble phenolic resin and (b) an alkali silicate salt into the molding sand, a silane coupling agent may be added.
【００１６】[0016]
【実施例】以下、本発明を実施例により詳細に説明する
が、本発明はこれらの実施例に限定されるものではな
い。EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited to these examples.
【００１７】実施例１〜５は本発明で用いる粘結剤組成
物を調整し、本発明における方法で鋳型造型を行い、比
較例１は従来法の有機系炭酸ガス硬化法で、比較例２は
従来法である水ガラス／CO2 硬化法で鋳型造型を行っ
た。In Examples 1 to 5, the binder composition used in the present invention was prepared, and molding was carried out by the method of the present invention. Comparative Example 1 was a conventional organic carbon dioxide curing method, and Comparative Example 2 was used. Made a mold by the conventional water glass / CO 2 curing method.
【００１８】＜粘結剤組成物の調整＞
炭酸ガス硬化型フェノール樹脂水溶液調整例１
フェノール94ｇ、50％水酸化カリウム 101ｇを１リット
ルフラスコに投入しパラホルムアルデヒド（純度92％）
65.2ｇを徐々に加え、この溶液を90℃で３時間保持し反
応させた後、35℃に冷却し50％水酸化カリウム 123.4ｇ
と硼砂30ｇ及びγ−アミノプロピルトリエトキシシラン
1.9ｇを加え、炭酸ガス硬化型フェノール樹脂水溶液を
得た。<Preparation of Binder Composition> Preparation Example 1 of Carbon Dioxide-Curable Phenol Resin Aqueous Solution 1 94 g of phenol and 101 g of 50% potassium hydroxide were placed in a 1-liter flask and paraformaldehyde (purity: 92%).
65.2g was gradually added, and this solution was kept at 90 ° C for 3 hours to react, then cooled to 35 ° C and 503.4% potassium hydroxide 123.4g.
And borax 30g and γ-aminopropyltriethoxysilane
1.9 g was added to obtain a carbon dioxide gas-curable phenol resin aqueous solution.
【００１９】炭酸ガス硬化型ビスフェノール樹脂水溶液
調整例２
ビスフェノール 114.2ｇ、50％水酸化カリウム 101ｇを
１リットルフラスコに投入しパラホルムアルデヒド（純
度92％）65.2ｇを徐々に加え、この溶液を90℃で３時間
保持し反応させた後、35℃に冷却し50％水酸化カリウム
123.4ｇと硼砂30ｇ及びγ−アミノプロピルトリエトキ
シシラン 1.9ｇを加え、炭酸ガス硬化型ビスフェノール
樹脂水溶液を得た。Preparation Example 2 of Carbon Dioxide-Curable Bisphenol Resin Aqueous Solution 114.2 g of bisphenol and 101 g of 50% potassium hydroxide were placed in a 1-liter flask, and 65.2 g of paraformaldehyde (purity 92%) was gradually added, and this solution was heated at 90 ° C. Hold for 3 hours to react, cool to 35 ° C, and add 50% potassium hydroxide.
123.4 g, borax 30 g, and γ-aminopropyltriethoxysilane 1.9 g were added to obtain a carbon dioxide-curable bisphenol resin aqueous solution.
【００２０】炭酸ガス硬化型フェノール・ビスフェノー
ル共縮合樹脂水溶液調整例３
フェノール47ｇ、ビスフェノール57.1ｇ、50％水酸化カ
リウム 101ｇを１リットルフラスコに投入しパラホルム
アルデヒド（純度92％）65.2ｇを徐々に加え、この溶液
を90℃で３時間保持し反応させた後、35℃に冷却し50％
水酸化カリウム123.4ｇと硼砂30ｇ及びγ−アミノプロ
ピルトリエトキシシラン 1.9ｇを加え、炭酸ガス硬化型
フェノール・ビスフェノール共縮合樹脂水溶液を得た。Preparation Example of Carbon Dioxide Curing Phenol / Bisphenol Co-Condensation Resin Aqueous Solution 3 47 g of phenol, 57.1 g of bisphenol and 101 g of 50% potassium hydroxide were placed in a 1 liter flask, and 65.2 g of paraformaldehyde (purity 92%) was gradually added. , This solution is kept at 90 ℃ for 3 hours to react, then cooled to 35 ℃ and 50%
123.4 g of potassium hydroxide, 30 g of borax and 1.9 g of γ-aminopropyltriethoxysilane were added to obtain a carbon dioxide curable phenol / bisphenol co-condensed resin aqueous solution.
【００２１】炭酸ガス硬化型フェノール・ビスフェノー
ル共縮合樹脂水溶液調整例４
フェノール47ｇ、ビスフェノール47ｇ、イソプロピルア
ルコール 0.3ｇ、メタクレゾール0.54ｇ、50％水酸化カ
リウム 101ｇを１リットルフラスコに投入しパラホルム
アルデヒド（純度92％）65.2ｇを徐々に加え、この溶液
を90℃で３時間保持し反応させた後、35℃に冷却し50％
水酸化カリウム 123.4ｇと硼砂30ｇ及びγ−アミノプロ
ピルトリエトキシシラン 1.9ｇを加え、炭酸ガス硬化型
フェノール・ビスフェノール共縮合樹脂水溶液を得た。Preparation Example of Carbon Dioxide-Curable Phenol / Bisphenol Co-Condensation Resin Aqueous Solution 4 Phenol 47 g, bisphenol 47 g, isopropyl alcohol 0.3 g, metacresol 0.54 g, and 50% potassium hydroxide 101 g were charged into a 1 liter flask and paraformaldehyde (purity 92%) 65.2 g was gradually added, and this solution was kept at 90 ° C for 3 hours to react, then cooled to 35 ° C and 50%.
123.4 g of potassium hydroxide, 30 g of borax and 1.9 g of γ-aminopropyltriethoxysilane were added to obtain a carbon dioxide curable phenol / bisphenol cocondensation resin aqueous solution.
【００２２】実施例１
鋳型造型用ミキサーで、国産珪砂６号 100kgに対して、
炭酸ガス硬化型フェノール樹脂水溶液調整例１で得られ
た水溶液を３kg及び水ガラス（珪酸ナトリウム、SiO2／
Na2O（モル比）＝ 2.2、45ボーメ度）を３kg混練し、鋳
鋼の熱間割れを評価する木型模型に充填し、次に炭酸ガ
スを送り込み鋳型を得た。この時の硬化に用いた炭酸ガ
スは対樹脂重量で50％使用した。また、炭酸ガスの流量
及びガス圧は流量150L／min.、ガス圧２ kgf／cm2 で３
分間通気した。次に、この鋳鋼用の熱間割れ評価の鋳型
を用いて材質がＳＣＳ−13（注湯温度は1530℃) を鋳造
して、鋳物を製作した。この時の中子の崩壊性と鋳物の
熱間割れ（補修時間）を評価した。結果を表１に示す。Example 1 With a mixer for molding a mold, with respect to 100 kg of domestic silica sand No. 6,
Carbon dioxide gas curable phenol resin aqueous solution 3 kg of the aqueous solution obtained in Preparation Example 1 and water glass (sodium silicate, SiO 2 /
3 kg of Na 2 O (molar ratio) = 2.2, 45 Baume degree) was kneaded and filled in a wooden model for evaluating hot cracking of cast steel, and then carbon dioxide was fed to obtain a mold. The carbon dioxide gas used for curing at this time was 50% based on the weight of the resin. The carbon dioxide flow rate and gas pressure are 150 L / min. And the gas pressure is 2 kgf / cm 2 ,
Aerated for minutes. Next, a casting was produced by casting SCS-13 (the pouring temperature was 1530 ° C.) as a material using the mold for hot cracking evaluation for this cast steel. At this time, the core disintegration property and the hot cracking of the casting (repair time) were evaluated. The results are shown in Table 1.
【００２３】実施例２
炭酸ガス硬化型フェノール樹脂水溶液調整例２で得られ
た水溶液を５kg、及び水ガラス（珪酸ナトリウム、SiO2
／Na2O（モル比）＝ 2.0、45ボーメ度）１kgを用いた以
外は実施例１と同様に鋳型の造型及び鋳物の製作を行っ
た。結果を表１に示す。Example 2 Carbon Dioxide-Curable Phenolic Resin Aqueous Solution 5 kg of the aqueous solution obtained in Preparation Example 2 and water glass (sodium silicate, SiO 2
Mold formation and casting production were carried out in the same manner as in Example 1 except that 1 kg of / Na 2 O (molar ratio) = 2.0, 45 Baume degree) was used. The results are shown in Table 1.
【００２４】実施例３
予め、炭酸ガス硬化型フェノール樹脂水溶液調整例３で
得られた水溶液と水ガラス（珪酸ナトリウム、SiO2／Na
2O（モル比）＝ 2.4、48ボーメ度）を混合（70重量部：
30重量部）しておき、その混合物を７kg用いた以外は実
施例１と同様に鋳型の造型及び鋳物の製作を行った。結
果を表１に示す。Example 3 The aqueous solution and water glass (sodium silicate, SiO 2 / Na) previously obtained in Preparation Example 3 of carbon dioxide-curable phenol resin aqueous solution were prepared in advance.
2 O (molar ratio) = 2.4, 48 Baume degree mixed (70 parts by weight:
30 parts by weight), and molding of a mold and production of a casting were performed in the same manner as in Example 1 except that 7 kg of the mixture was used. The results are shown in Table 1.
【００２５】実施例４
予め、炭酸ガス硬化型フェノール樹脂水溶液調整例３で
得られた水溶液と珪酸カリウム（SiO2／K2O(モル比）＝
2.0、45ボーメ度）を混合（80重量部：20重量部）して
おき、その混合物を７kg用いた以外は実施例１と同様に
鋳型の造型及び鋳物の製作を行った。結果を表１に示
す。Example 4 The aqueous solution obtained in Preparation Example 3 of carbon dioxide-curable phenol resin solution and potassium silicate (SiO 2 / K 2 O (molar ratio) =
2.0, 45 Baume degree) was mixed (80 parts by weight: 20 parts by weight) and 7 kg of the mixture was used to mold a mold and manufacture a casting in the same manner as in Example 1. The results are shown in Table 1.
【００２６】実施例５
炭酸ガス硬化型フェノール樹脂水溶液調整例４で得られ
た水溶液５kgと珪酸カルシウム（SiO2／CaO(モル比）＝
1.0、粉末状、純度98％）２kgを用いた以外は実施例１
と同様に鋳型の造型及び鋳物の製作を行った。結果を表
１に示す。Example 5 Carbon Dioxide-Curable Phenolic Resin Aqueous Solution 5 kg of the aqueous solution obtained in Preparation Example 4 and calcium silicate (SiO 2 / CaO (molar ratio) =
1.0, powder, purity 98%) Example 1 except that 2 kg was used
In the same manner as described above, a mold was made and a casting was produced. The results are shown in Table 1.
【００２７】比較例１
鋳型造型用ミキサーで、国産珪砂６号100kg に対して、
炭酸ガス硬化型フェノール樹脂水溶液調整例１で得られ
た水溶液を６kgを用いて、水ガラスを使用せずに混練し
た以外は実施例１と同様に鋳型の造型及び鋳物の製作を
行った。結果を表１に示す。Comparative Example 1 With a mixer for molding a mold, with respect to 100 kg of domestic silica sand No. 6,
Preparation of carbon dioxide gas type phenolic resin aqueous solution A mold was made and castings were made in the same manner as in Example 1 except that 6 kg of the aqueous solution obtained in Preparation Example 1 was kneaded without using water glass. The results are shown in Table 1.
【００２８】比較例２
鋳型造型用ミキサーで、国産珪砂６号100kg に対して、
炭酸ガス硬化型フェノール樹脂水溶液調整例１で得られ
た水溶液を用いずに水ガラス（珪酸ナトリウム、SiO2／
Na2O（モル比）＝ 2.2、45ボーメ度）６kgを混練した以
外は実施例１と同様に鋳型の造型及び鋳物の製作を行っ
た。結果を表１に示す。Comparative Example 2 With a mixer for molding a mold, with respect to 100 kg of domestic silica sand No. 6,
Carbon dioxide curing type phenol resin aqueous solution Without using the aqueous solution prepared in Example 1, water glass (sodium silicate, SiO 2 /
Molding and casting were performed in the same manner as in Example 1 except that 6 kg of Na 2 O (molar ratio) = 2.2, 45 Baume degree) was kneaded. The results are shown in Table 1.
【００２９】尚、以下に熱間割れの長さ（補修時間）及
び鋳型の崩壊性の測定方法を示す。
・熱間割れの長さ
鋳物を作製した後、磁気探傷法で調べ割れの全長を測定
した。The methods for measuring the length of hot cracking (repair time) and the disintegration property of the mold are shown below. -Length of hot cracking After producing a casting, the length of cracking was measured by magnetic flaw detection.
【００３０】・補修時間
上記の熱間割れを電気溶接法（ガウジング）で鋳物を補
修したトータル時間を示す。Repair time The total time taken to repair the above-mentioned hot cracking of the casting by electric welding (gouging) is shown.
【００３１】・鋳型の崩壊性
鋳造後の鋳型を取り出し、それをクラッシャー（鋳型バ
ラシ機）にかけて14Meの篩をパスする粒度の回収砂にす
るための所要時間によって鋳型崩壊性の良し悪しを以下
のように評価した。
◎ 優れる … 30分以内
○ やや優れる … 30分以上〜45分以内
△ やや劣る … 45分以上〜60分以内
× 劣る … 60分以上Disintegration of the mold The quality of the mold disintegration is determined by the time required to take out the mold after casting and apply it to a crusher (mold disintegrator) to obtain recovered sand having a particle size that passes through a 14 Me sieve. Was evaluated as. ◎ Excellent… Within 30 minutes ○ Somewhat excellent… Within 30 minutes to 45 minutes △ Somewhat inferior… 45 minutes to 60 minutes × Inferior… 60 minutes or more
【００３２】[0032]
【表１】 [Table 1]
【００３３】実施例１〜５は比較例１及び２に較べ熱間
割れ長さ、その補修時間、及び鋳型の崩壊性の性能バラ
ンスが顕著に優れることが明白である。It is clear that Examples 1 to 5 are remarkably excellent in performance balance of hot crack length, repair time thereof, and mold disintegration property as compared with Comparative Examples 1 and 2.
【００３４】[0034]
【発明の効果】本発明の鋳型造型方法によって得られる
鋳型組成物は、鋳鋼での熱間割れの長さ、即ち鋳物熱間
割れの補修改善を可能とするもので、そのうえ水ガラス
／CO2硬化法よりも鋳型崩壊性が優れ、砂再生性の改善
が可能となる。従って、鋳造工程の鋳物の仕上げ行程及
び鋳造作業工程労力の改善を図るものであり、作業環境
等を含め、有益な効果を奏するものである。EFFECT OF THE INVENTION The mold composition obtained by the mold making method of the present invention is capable of improving the length of hot cracking in cast steel, that is, repairing of hot cracking in casting, and also water glass / CO 2 The mold disintegration property is superior to that of the curing method, and sand reproducibility can be improved. Therefore, it is intended to improve the finishing process of the casting in the casting process and the labor of the casting work process, and to exert a beneficial effect including the working environment.
フロントページの続き (56)参考文献 特開 昭49−10115（ＪＰ，Ａ) 特開 平６−210391（ＪＰ，Ａ) 特開 平６−297075（ＪＰ，Ａ) 特開 平７−185731（ＪＰ，Ａ) 特公 昭45−6242（ＪＰ，Ｂ１) 特公 昭47−26932（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B22C 1/00 - 1/26 B22C 9/12 Continuation of the front page (56) Reference JP-A-49-10115 (JP, A) JP-A-6-210391 (JP, A) JP-A-6-297075 (JP, A) JP-A-7-185731 (JP , A) JP-B-45-6242 (JP, B1) JP-B-47-26932 (JP, B1) (58) Fields investigated (Int.Cl. 7 , DB name) B22C 1/00-1/26 B22C 9/12
Claims (4)
性フェノール系樹脂、（ｂ）珪酸アルカリ塩及び（ｄ）
オキシアニオン化合物類からなる粘結剤組成物を混練し
て（ｃ）炭酸ガスで硬化させることを特徴とする鋳型造
型方法。1. With respect to foundry sand, (a) an alkaline water-soluble phenolic resin , ( b) an alkali silicate salt, and (d).
A method for molding a mold, which comprises kneading a binder composition comprising oxyanion compounds and curing (c) carbon dioxide gas.
カリ性水溶性フェノール系樹脂を0.01〜７重量部、
（ｂ）珪酸アルカリ塩を0.01〜７重量部、（ｃ）炭酸ガ
スを0.01〜30重量部使用することを特徴とする請求項１
記載の鋳型造型方法。2. 0.01 to 7 parts by weight of (a) an alkaline water-soluble phenolic resin per 100 parts by weight of molding sand,
2. 0.01 to 7 parts by weight of (b) an alkali silicate salt and 0.01 to 30 parts by weight of (c) carbon dioxide gas are used.
The described mold making method.
スフェノール類・ホルムアルデヒド樹脂又はフェノール
類・ビスフェノール類・ホルムアルデヒド共縮合樹脂で
あることを特徴とする請求項１又は２記載の鋳型造型方
法。3. The template molding method according to claim 1, wherein the alkaline water-soluble phenolic resin is a bisphenol / formaldehyde resin or a phenol / bisphenol / formaldehyde co-condensation resin.
造型方法によって得られる鋳型組成物。4. A mold composition obtained by the mold making method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22536195A JP3453461B2 (en) | 1995-09-01 | 1995-09-01 | Mold molding method and mold composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22536195A JP3453461B2 (en) | 1995-09-01 | 1995-09-01 | Mold molding method and mold composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0966346A JPH0966346A (en) | 1997-03-11 |
| JP3453461B2 true JP3453461B2 (en) | 2003-10-06 |
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ID=16828145
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|---|---|---|---|
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