JPS62244546A - Mold coating material for chill of cast steel casting - Google Patents

Mold coating material for chill of cast steel casting

Info

Publication number
JPS62244546A
JPS62244546A JP8744186A JP8744186A JPS62244546A JP S62244546 A JPS62244546 A JP S62244546A JP 8744186 A JP8744186 A JP 8744186A JP 8744186 A JP8744186 A JP 8744186A JP S62244546 A JPS62244546 A JP S62244546A
Authority
JP
Japan
Prior art keywords
powder
chill
mold coating
coating material
cast steel
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.)
Granted
Application number
JP8744186A
Other languages
Japanese (ja)
Other versions
JPH0334415B2 (en
Inventor
Yoshio Sasaki
佐々木 慶夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP8744186A priority Critical patent/JPS62244546A/en
Publication of JPS62244546A publication Critical patent/JPS62244546A/en
Publication of JPH0334415B2 publication Critical patent/JPH0334415B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To improve the resistance to cracking and exfoliation of a mold coating material for a chill and to improve the coating performance thereof by using a mixture prepd. by compounding a specific ratio of Al powder with refractory powder as aggregate. CONSTITUTION:The powder mixture prepd. by compounding 5-20wt% Al powder with refractory powder is incorporated as the aggregate into the mold coating material for chilling a caste steel casting. The coated film formed on the chill surface by using such mold coating material is converted to the composite film composed of Al and refractory particles and to form alumina as the Al powder is melted by the heat of a molten metal. The coated film is thereby reinforced and the generation of cracking and exfoliation by the difference in the coefft. of thermal expansion from the chill is obviated; in addition, the welding and seizure of the chill and cast steel product are prevented. Since the Al powder has a deoxidiation effect, the generation of blowholes occurring in red rust is prevented even if the red rust exists on the chill surface.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、鋳鋼品鋳造用砂型のチル(冷し金)に使用さ
れる塗型剤に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold coating agent used for chilling sand molds for casting steel products.

〔従来の技術〕[Conventional technology]

鋳鋼品の鋳造用砂型内には、鋳造方案上、チルが設置さ
れる。チルは、鋳鉄または炭素鋼などからなるメタルブ
ロックであり、砂型内に鋳込まれた鋳鋼溶湯の冷却凝固
過程における指向性凝固を促進し、引は巣などの鋳造欠
陥のない健全な鋳鋼品を得る目的で、鋳鋼品の形状・サ
イズに応じて砂型内の適宜の個所に設置される。
A chill is installed in the sand mold for casting steel products due to the casting method. Chill is a metal block made of cast iron or carbon steel that promotes directional solidification during the cooling and solidification process of molten cast steel cast in a sand mold, producing sound cast steel products without casting defects such as shrinkage cavities. For the purpose of obtaining sand, it is placed at an appropriate location within the sand mold depending on the shape and size of the cast steel product.

その砂型やチルの表面には、一般に塗型剤が塗布される
。塗型剤は、砂型内に鋳込まれる鋳鋼溶湯と砂型・チル
との直接接触を遮断することにより、融着・焼着きを防
止し、鋳鋼品の鋳肌を平滑美麗なものとする役目を有す
るものである。
A mold coating agent is generally applied to the surface of the sand mold or chill. Coating agents prevent direct contact between the molten cast steel that is poured into the sand mold and the sand mold/chill, thereby preventing fusion and seizing, and making the casting surface of cast steel products smooth and beautiful. It is something that you have.

この塗型剤は、ジルコンフラワー、アルミナ、シャモッ
ト、ムライト、クロマイトサンド、溶融けい砂等の耐火
物粉末を骨材とする塗料であり、メタノール、イソプロ
パツール、エタノール等のアルコールにて適当な濃度に
調整され、必要に応じて粘結剤等の添加剤が配合されて
、刷子塗り・スプレー等により塗布される。
This coating agent is a paint whose aggregate is refractory powder such as zircon flour, alumina, chamotte, mullite, chromite sand, and fused silica sand. Additives such as a binder are added as necessary, and the coating is applied by brushing, spraying, etc.

なお、近時有機系の自硬性鋳型用塗型剤として、耐火度
の高い水性のジルコン系塗型剤が、耐焼着き性にすぐれ
ていること等から、上記のアルコール性塗型剤に代わっ
て賞月されつつある。
In recent years, water-based zircon-based coating agents with high fire resistance have been used as organic self-hardening mold coating agents in place of the above-mentioned alcohol-based coating agents due to their excellent seizing resistance. It is being awarded awards.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の塗型剤は、砂型等の耐火物に対する塗型剤として
使用する場合は所期の塗型性能を示すが、チルの塗型剤
として使用した場合の塗型性能は十分と言えない。それ
は、チルが、砂型等の耐火物と異なり、鋳鉄や炭素鋼な
どのブロックであって鋳鋼溶湯との融着・焼着きが生し
易いうえに、チルの表面に塗布された塗型膜との熱膨張
率の差が大きいため、鋳鋼溶湯の鋳込み時に塗型膜に亀
裂・剥離が生じ易いからである。
Conventional mold coating agents exhibit desired mold coating performance when used as mold coating agents for refractory materials such as sand molds, but their mold coating performance cannot be said to be sufficient when used as chill mold coating agents. Unlike refractories such as sand molds, chills are blocks made of cast iron, carbon steel, etc., and are prone to fusion and seizing with molten cast steel. This is because there is a large difference in the coefficient of thermal expansion of the cast steel, so cracks and peeling tend to occur in the coating film during pouring of molten cast steel.

また、耐焼着き性にすぐれているとされる水性のジルコ
ン系塗型剤をチルに使用した場合には、チルに赤錆(F
 e O,、F e2o3、Fe(OH)3など)が発
生するため、これをチル用塗型剤として実用することは
できない。チルに赤錆が発生した状態で、鋳鋼溶湯を砂
型に鋳込むと、溶湯の熱で赤錆のFe01Fe203、
Fe(OH)+等が分解し、生成した02ガスやCOガ
スが鋳鋼鋳造品内に侵入し、ブローホール等の重大な鋳
造欠陥を発生させるからである。
In addition, when a water-based zircon type coating agent, which is said to have excellent seizure resistance, is used for chilling, red rust (F
eO, Fe2o3, Fe(OH)3, etc.), it cannot be put to practical use as a chill mold coating agent. When molten cast steel is poured into a sand mold with red rust occurring in the chill, the heat of the molten metal causes the red rust to form as Fe01Fe203,
This is because Fe(OH)+ etc. decompose and the generated 02 gas and CO gas enter the cast steel product and cause serious casting defects such as blowholes.

本発明は、上記問題点を解決するための改良されたチル
用塗型剤を提供しようとするものである。
The present invention aims to provide an improved chill coating agent to solve the above problems.

〔問題点を解決するための手段および作用〕本発明のチ
ル用塗型剤は、耐火物粉末と5〜20重量%のアルミニ
ウム粉末との混合物を骨材として含有している点に特徴
を有する。
[Means and effects for solving the problems] The chill coating agent of the present invention is characterized in that it contains a mixture of refractory powder and 5 to 20% by weight of aluminum powder as an aggregate. .

本発明の塗型剤を用いてチル表面に塗設された塗型膜は
、鋳tliiI溶湯が鋳込まれると、その溶湯の熱でア
ルミニウム粉末が溶融することにより、アルミニウムと
耐火物粒子との複合皮膜となり、またアルミナ(Anz
Os)が生成する。塗型膜は、この複合皮膜化とアルミ
ナの生成により強化され、チルとの熱膨張率の差に因る
亀裂・剥離を生じることなく、チルと鋳鋼品との融着・
焼着きを未然に防止する。
The coating film applied to the chilled surface using the coating agent of the present invention is formed by melting the aluminum powder by the heat of the molten metal when the molten metal is cast, thereby forming a bond between the aluminum and the refractory particles. It becomes a composite film, and alumina (Anz
Os) is generated. The coating film is strengthened by this composite coating and the formation of alumina, and is able to fuse and bond the chill and cast steel without cracking or peeling due to the difference in thermal expansion coefficient between the chill and the cast steel.
Prevent burn-in.

また、アルミニウム粉末は、強力な脱酸作用を有してい
るので、チルの表面に赤錆が存在していても、赤錆の分
解により生成するガスをA6zO+の形で固定化するこ
とにより、赤錆に起因するブローホールの発生を未然に
防止する効果を併せ有する。
In addition, aluminum powder has a strong deoxidizing effect, so even if red rust is present on the surface of the chiller, the gas generated by the decomposition of the red rust is fixed in the form of A6zO+, thereby eliminating the red rust. It also has the effect of preventing the occurrence of blowholes.

本発明において、耐火物粉末とアルミニウム粉末の混合
粉末からなる骨材におけるアルミニウム粉末の配合量を
5重量%以上とするのは、上記のアルミニウムによる塗
型膜の強化、および脱酸作用に伴うブローホール発生防
止の効果を確保するためである。また、アルミニウム粉
末の配合量の上限ヲ20重量%に規定したのは、それを
超えると、塗型膜の耐火性が低下し、チルに対する塗型
効果が減じることになるからである。
In the present invention, the content of aluminum powder in the aggregate made of a mixed powder of refractory powder and aluminum powder is set to 5% by weight or more to strengthen the coated film with the aluminum described above and to blow the mold due to the deoxidizing effect. This is to ensure the effect of preventing hole generation. The reason why the upper limit of the amount of aluminum powder is set at 20% by weight is that if it exceeds this, the fire resistance of the coating film will decrease, and the coating effect on chilling will be reduced.

アルミニウム粉末が配合される耐火物粉末としては、従
来よりこの種の塗型剤の骨材として知られている各種の
耐火物粉末、例えばジルコンフラワー、アルミナ、シャ
モット、ムライト、クロマイトサンド、溶融けい砂等の
中から選ばれる1種または2種以上の粉末を適宜使用す
ることができる。
The refractory powder to which the aluminum powder is blended includes various refractory powders conventionally known as aggregates for this type of coating agent, such as zircon flour, alumina, chamotte, mullite, chromite sand, and fused silica sand. One or more powders selected from the following can be used as appropriate.

また、溶剤は、エタノール、イソプロハノール、メタノ
ール等のアルコール類はむろんのこと、赤錆によるブロ
ーホールの発生の懸念がないので、水を溶剤とし、水性
の塗型剤として使用することもできる。アルコール性の
塗型剤として用いる場合は、エステル類やキシレン、ミ
ネラルターペン等を溶剤として加えることも可能である
In addition, the solvent can be alcohols such as ethanol, isoprohanol, methanol, etc., and water can also be used as a water-based mold coating agent since there is no concern that blowholes will be generated due to red rust. When used as an alcoholic coating agent, it is also possible to add esters, xylene, mineral turpentine, etc. as a solvent.

更に、溶剤と共に必要に応じて添加される粘結剤も、こ
の種の塗型剤の調製に用いられるものと同じであってよ
く、例えば水を溶剤とする水性塗型剤の場合には、ベン
トナイト、木簡粘土、コロイダルシリカ等が用いられ、
またアルコール類を溶剤とする場合には、フェノールレ
ジン等を用いればよい。
Furthermore, the binder that is optionally added together with the solvent may be the same as that used in the preparation of this type of mold coating; for example, in the case of an aqueous mold coating that uses water as the solvent, Bentonite, wooden clay, colloidal silica, etc. are used.
Furthermore, when alcohol is used as a solvent, phenol resin or the like may be used.

そのほか、例えばチクソトロピー性の付与、骨材の沈降
防止、あるいは塗布性の改善等を目的として、界面活性
剤や増粘剤、その他の添加剤を加えてもよい。
In addition, surfactants, thickeners, and other additives may be added, for example, for the purpose of imparting thixotropy, preventing sedimentation of aggregates, or improving coating properties.

〔実施例〕〔Example〕

〔I〕塗型剤の調製 次の3種の塗型剤(A)、(B)および(C)を調製。 [I] Preparation of coating agent The following three types of coating agents (A), (B) and (C) were prepared.

塗型剤A(アルコール性)および(B)(水性)は本発
明例であり、塗型剤(C)(水性)はアルミニウム粉未
配合量が不足する比較例である。
Coating agents A (alcoholic) and (B) (aqueous) are examples of the present invention, and coating agent (C) (aqueous) is a comparative example in which the amount of aluminum powder is insufficient.

いずれも耐火物粉末は、ジルコンフラワー+ムライトフ
ラワー(粒径:325メソシユ以下)であり、アルミニ
ウム粉末の粒径は0.1 vna (150メソシユ)
以下である。また、配合量を示す%は重量%である。
In both cases, the refractory powder is zircon flour + mullite flour (particle size: 325 mesosci or less), and the particle size of the aluminum powder is 0.1 vna (150 mesos).
It is as follows. In addition, % indicating the blending amount is % by weight.

腫潤測ユ人L〔発明例〕 骨材中のアルミニウム配合量:20重量%熔剤:骨材1
00重量部にエタノール90重量部を添加。
Tumor measurement unit L [Invention example] Aluminum content in aggregate: 20% by weight Solvent: Aggregate 1
90 parts by weight of ethanol was added to 00 parts by weight.

粘結剤:フェノールレジン 5% 界面活性剤ニジアルキルスルホコハク酸ナトリウム0.
02% Pi!H1(B)C発明例〕 骨材中のアルミニウム配合量:5重量%溶剤:骨材10
0重量部に水95重量部添加。
Binder: Phenol resin 5% Surfactant Sodium nidialkylsulfosuccinate 0.
02% Pi! H1(B)C invention example] Aluminum content in aggregate: 5% by weight Solvent: Aggregate 10
95 parts by weight of water was added to 0 parts by weight.

粘結材:ベントナイト    4% コロイダルシリカ 0.5% 塗型剤(C)〔比較例〕 骨材中のアルミニウム配合量:2重量%溶剤:骨材10
0重量部に水95重量部添加。
Caking agent: Bentonite 4% Colloidal silica 0.5% Coating agent (C) [Comparative example] Aluminum content in aggregate: 2% by weight Solvent: Aggregate 10
95 parts by weight of water was added to 0 parts by weight.

粘結材:ベントナイト    4% コロイダルシリカ 0.5% (II)チル表面への塗布および砂型鋳造塗型側(A)
、(B)、(C)のそれぞれを、鋳鋼品鋳造用砂型内に
設置されたチル(鋳鋼ブロック。
Caking material: bentonite 4% colloidal silica 0.5% (II) Application to chilled surface and sand casting mold side (A)
, (B), and (C) are each chilled (cast steel block) installed in a sand mold for casting steel products.

50X50X20. fl)の表面に塗布した。なお、
砂型表面には、アルミニウム粉末を含まない通常の塗型
剤(骨材:ジルコンフラワー)を塗布した。
50X50X20. fl). In addition,
A normal mold coating agent (aggregate: zircon flour) containing no aluminum powder was applied to the surface of the sand mold.

上記砂型内に鋳!1iiI溶湯を注湯しく注湯温度:1
560℃)、鋳鋼品(単重:800kg) (A )、
(B)および(C)を得た。
Cast in the sand mold above! 1iii Pouring molten metal Pouring temperature: 1
560℃), cast steel product (unit weight: 800kg) (A),
(B) and (C) were obtained.

本発明の塗型剤を用いて鋳造された鋳鋼品(A)および
(B)は、チル部分の鋳肌も平滑美麗であり、またブロ
ーホールの発生も皆無であることが確認された。一方、
塗型剤(C)を用いて鋳造された鋳鋼品(C)のチル部
分には軽微であるが、焼着きが生じ、また内部に若干の
ブローホールが認められた。
It was confirmed that the cast steel products (A) and (B) cast using the mold coating agent of the present invention had smooth and beautiful casting surfaces in the chilled portion, and no blowholes were generated. on the other hand,
The cast steel product (C) that was cast using the mold coating agent (C) had some burning, although slight, in the chilled part, and some blowholes were observed inside.

〔発明の効果〕〔Effect of the invention〕

本発明のチル用塗型剤は、耐亀裂・剥離性にすぐれ、ま
たチルにブローホールの原因となる赤錆が存在してもこ
れを無害なものとする等、従来材を凌ぐ塗型性能を有し
ている。
The chill mold coating agent of the present invention has excellent cracking and peeling resistance, and even if red rust that causes blowholes is present in the chill coating, it is harmless, and has coating performance that exceeds that of conventional materials. have.

従って、本発明の塗型剤を使用することにより、チルの
焼着きゃブローホール等の鋳造欠陥を防止し、表面性状
および内部品質ともにすぐれた鋳鋼品を鋳造することが
でき、かつ鋳造歩留りを高めることができる。
Therefore, by using the mold coating agent of the present invention, casting defects such as chill burning and blowholes can be prevented, and cast steel products with excellent surface and internal quality can be cast, and the casting yield can be improved. can be increased.

Claims (1)

【特許請求の範囲】[Claims] (1)耐火物粉末に5〜20重量%のアルミニウム粉末
が配合された粉末混合物を骨材としてなる鋳鋼鋳物のチ
ル用塗型剤。
(1) A mold coating agent for chilling cast steel castings, which is made of a powder mixture containing refractory powder and 5 to 20% by weight of aluminum powder as an aggregate.
JP8744186A 1986-04-15 1986-04-15 Mold coating material for chill of cast steel casting Granted JPS62244546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8744186A JPS62244546A (en) 1986-04-15 1986-04-15 Mold coating material for chill of cast steel casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8744186A JPS62244546A (en) 1986-04-15 1986-04-15 Mold coating material for chill of cast steel casting

Publications (2)

Publication Number Publication Date
JPS62244546A true JPS62244546A (en) 1987-10-24
JPH0334415B2 JPH0334415B2 (en) 1991-05-22

Family

ID=13914943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8744186A Granted JPS62244546A (en) 1986-04-15 1986-04-15 Mold coating material for chill of cast steel casting

Country Status (1)

Country Link
JP (1) JPS62244546A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011251292A (en) * 2010-05-31 2011-12-15 Kao Corp Facing material composition
CN106077444A (en) * 2016-07-15 2016-11-09 江苏迅隆科技发展有限公司 A kind of Quench coating of novel replacement chill usefulness and preparation method thereof
CN107855460A (en) * 2017-11-08 2018-03-30 蚌埠市华鼎机械科技有限公司 A kind of cast paint for lead-acid accumulator cast welding machine surface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011251292A (en) * 2010-05-31 2011-12-15 Kao Corp Facing material composition
CN106077444A (en) * 2016-07-15 2016-11-09 江苏迅隆科技发展有限公司 A kind of Quench coating of novel replacement chill usefulness and preparation method thereof
CN107855460A (en) * 2017-11-08 2018-03-30 蚌埠市华鼎机械科技有限公司 A kind of cast paint for lead-acid accumulator cast welding machine surface

Also Published As

Publication number Publication date
JPH0334415B2 (en) 1991-05-22

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