JPH04138838A - Facing agent for cast iron casting - Google Patents
Facing agent for cast iron castingInfo
- Publication number
- JPH04138838A JPH04138838A JP25740490A JP25740490A JPH04138838A JP H04138838 A JPH04138838 A JP H04138838A JP 25740490 A JP25740490 A JP 25740490A JP 25740490 A JP25740490 A JP 25740490A JP H04138838 A JPH04138838 A JP H04138838A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- casting
- mold
- powder
- binder
- 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
Links
- 238000005266 casting Methods 0.000 title claims abstract description 26
- 229910001018 Cast iron Inorganic materials 0.000 title claims description 10
- 239000003795 chemical substances by application Substances 0.000 title abstract 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims description 18
- 239000010439 graphite Substances 0.000 abstract description 33
- 229910002804 graphite Inorganic materials 0.000 abstract description 33
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、鋳鉄鋳物を製造する際に、鋳型の侵食や焼着
を防止するための鋳鉄鋳物用塗型剤に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mold coating agent for cast iron castings for preventing mold erosion and seizing during the production of cast iron castings.
［従来の技術］
鋳鉄鋳物の製造において、黒鉛塗型は、溶湯やノロと濡
れ難いため、鋳物と鋳型の剥離を容易にし鋳肌を改善す
る効果が優れていることから多用されている。[Prior Art] In the production of cast iron castings, graphite coated molds are often used because they are difficult to wet with molten metal or slag, and are effective in facilitating peeling between the casting and the mold and improving the casting surface.
ところか、従来の黒鉛塗型は、溶湯注湯時に黒鉛の一部
か酸化消耗するため、鋳型への保護作用が不十分となり
、鋳型の侵食や焼着を生し易い傾向かあった。However, in conventional graphite-coated molds, a portion of the graphite is oxidized and consumed during pouring of molten metal, resulting in insufficient protection for the mold and a tendency to cause corrosion and burning of the mold.
このような黒鉛塗型の問題点を解決するため、黒鉛塗型
にジルコン粉末を配合したり（例えば特開昭６１−１５
０７３９号）、クロマイト粉末等の耐火物を配合しく例
えは特公昭５７−５９０１２号）、黒鉛塗型の耐火性を
増大する方法か提案されている。In order to solve these problems of graphite coating molds, zircon powder was added to graphite coating molds (for example, in Japanese Patent Application Laid-Open No. 61-15
No. 0739), and Japanese Patent Publication No. 57-59012), which incorporates a refractory material such as chromite powder, have been proposed to increase the fire resistance of graphite coated molds.
［発明が解決しようとする課Ｍ］
然しなから、上述の従来技術ては、黒鉛の酸化消耗とい
う本質的な現象を抑制する°ことかてきないため、凝固
まてに時間のかかる大型鋳物や、黒鉛の酸化を促進し易
い高Ｃｒ鋳鉄鋳物等の鋳造時には、鋳型の侵食や焼着な
防止することかてきない。[Problem to be solved by the invention] However, since the above-mentioned conventional technology cannot suppress the essential phenomenon of oxidation consumption of graphite, When casting high Cr cast iron, etc., which easily promotes the oxidation of graphite, it is impossible to prevent corrosion and burning of the mold.
本発明は、黒鉛の耐酸化性及び耐食性を向上し、鋳物の
肌荒れや焼着の発生のない黒鉛系塗型剤を提供すること
を目的とする。An object of the present invention is to provide a graphite-based mold coating agent that improves the oxidation resistance and corrosion resistance of graphite and does not cause surface roughness or burning of castings.
［課題を解決するための手段］
本発明者は、塗型の耐酸化性及び耐食性を改善するため
、種々検討した結果、黒鉛よりも酸化し易い元素、黒鉛
の酸化カスを還元する元素、特にＡＩ２を黒鉛に添加す
ることにより、黒鉛の酸化消耗を抑制できることを認め
た。[Means for Solving the Problems] In order to improve the oxidation resistance and corrosion resistance of the coating mold, the present inventor has conducted various studies and found that an element that is more easily oxidized than graphite, an element that reduces the oxidized residue of graphite, especially It was confirmed that oxidative consumption of graphite can be suppressed by adding AI2 to graphite.
また、更に、粘結剤としてアルミナを主成分として添加
することにより、黒鉛の耐食性を向上てきることを認め
た。Furthermore, it has been recognized that the corrosion resistance of graphite can be improved by adding alumina as a main component as a binder.
即ち、請求項１に記載の本発明は、鋳鉄鋳物用塗型剤に
おいて、黒鉛粉末７０〜９５ｖｔ％とＡβ粉末３０〜５
ｗｔ％からなる基材と、粘結剤と溶剤からなる希釈溶液
とを、混合して構成されるようにしたものである。That is, the present invention as set forth in claim 1 provides a mold coating agent for cast iron castings containing 70 to 95 vt% of graphite powder and 30 to 5 vt% of Aβ powder.
It is made up of a mixture of a base material consisting of wt% and a diluted solution consisting of a binder and a solvent.
また、請求項２に記載の本発明は、前記希釈溶液か、粘
結剤としてアルミナゾルな５〜３０ｗｔ％含有するよう
にしたものである。Further, in the present invention as set forth in claim 2, the diluted solution contains 5 to 30 wt% of alumina sol as a binder.
［作用コ
本発明では、黒鉛粉末にＡＪ２粉末を配合して基材とし
た。即ち、八ρは黒鉛よりも儀化し易いため、注湯時に
は優先的に酸化して黒鉛の酸化を抑制する６また、黒鉛
の酸化か生しても、下式の反応により黒鉛か再析出する
ため黒鉛の消耗を抑制てきる。また、生成した八β２０
３は黒鉛塗型の耐食性を強化する。[Function] In the present invention, AJ2 powder was blended with graphite powder to form a base material. In other words, since 8ρ is easier to form than graphite, it is preferentially oxidized during pouring to suppress the oxidation of graphite.6Also, even if graphite oxidizes, graphite is re-precipitated by the reaction of the following formula. Therefore, consumption of graphite can be suppressed. In addition, the generated 8β20
3 strengthens the corrosion resistance of the graphite coated mold.
２／３ＡＩ２ｔＬ）＋ Ｃｏ ｆｉｔ→１／３／ｌ！
ｔｏｚ（ｓ）” Ｃｔｓ＋−（１）ここで、八で粉末の
配合量が５％未満であると、黒鉛の酸化消耗の抑制効果
か十分てなく、３０％を超えて含有させると効果か飽和
するばかりか、鋳物に肌荒れか生ずるため、Ａρの配合
量は５〜３０重量％に限定した。2/3AI2tL)+Co fit→1/3/l!
toz(s)" Cts+-(1) Here, in step 8, if the amount of powder blended is less than 5%, the effect of suppressing the oxidation consumption of graphite is not sufficient, and if it is contained in more than 30%, the effect is saturated. In addition, the amount of Aρ blended was limited to 5 to 30% by weight because it also caused roughness in the casting.
本発明ては、上述の基材に希釈溶液を添加し、鋳型表面
に塗布する塗型剤とした。希釈溶液は粘結剤と溶剤とか
らなり、粘結剤としては、無機系のものと有機系のもの
どちらも採用てきる。溶剤は、水、アルコール等か採用
てきる。In the present invention, a diluted solution was added to the above-mentioned base material to form a mold coating agent to be applied to the surface of the mold. The diluted solution consists of a binder and a solvent, and both inorganic and organic binders can be used as the binder. The solvent may be water, alcohol, etc.
向、無機系粘結剤としては、粘土、ベントナイト、水ガ
ラス、エチルシリケート等か採用てき、有機系粘結剤と
しては、フェノール系樹脂、アクリル系樹脂等が採用て
きる。As the inorganic binder, clay, bentonite, water glass, ethyl silicate, etc. are used, and as the organic binder, phenolic resin, acrylic resin, etc. are used.
但し、本発明ては、粘結剤としてアルミナゾルを用いる
のか好適である。However, in the present invention, it is preferable to use alumina sol as the binder.
アルミナゾルは、コロイドの大きさを持つアルミナ水和
物の溶液て、チクソトロピックな性状と優れた結合性を
備えるため、良好な粘結剤となる。高温ては横遣水の脱
水反応によりＡρ、０３になるため、黒鉛塗型の耐食性
、熱間強度を向上する。ここで、塗型希釈溶液中のアル
ミナゾル配合量か５％未満であると、塗型の強度が不足
し、また３０％を超えて配合しても効果が飽和するため
、アルミナゾルの配合量は ５〜３０％に限定した。Alumina sol is a solution of hydrated alumina with colloidal size and has thixotropic properties and excellent bonding properties, making it a good binder. At high temperatures, Aρ becomes 03 due to the dehydration reaction of the side water, which improves the corrosion resistance and hot strength of the graphite coated mold. If the amount of alumina sol in the diluted coating solution is less than 5%, the strength of the coating mold will be insufficient, and even if it exceeds 30%, the effect will be saturated, so the amount of alumina sol added is 5%. It was limited to ~30%.
また、本発明において、基材と希釈溶液の混合は、塗型
が３０〜５０ボーメになるように調整するのが好適であ
る。Further, in the present invention, the mixing of the base material and the diluted solution is preferably adjusted so that the coating size is 30 to 50 Baume.
以上のような本発明の黒鉛塗型を鋳型の最表面に塗布し
て鋳造を行なえば、鋳肌か美麗で且つ鋳型の焼着のない
鋳物が得られる。By applying the graphite coated mold of the present invention as described above to the outermost surface of the mold and performing casting, a casting with a beautiful casting surface and no mold burning can be obtained.
［実施例］ 本発明の実施例を比較例と併せて以下に説明する。[Example] Examples of the present invention will be described below along with comparative examples.
表１に示す組成の基材と希釈溶液を（塗型か３５〜４０
ホーメとなるように）混合して塗型剤Ａ〜Ｈな作成した
。The base material with the composition shown in Table 1 and the diluted solution (coating type 35-40
The mold coating agents A to H were prepared by mixing them so as to give a uniform appearance.
そして、表１の塗型剤Ａ−Ｈを砂型内面に塗布し、製品
重量的５ｔｏｎの円筒状高Ｃｒ鋳鉄鋳物を鋳造し、焼着
部の面積、肌荒れ状況を調べ、表２に示す如くの調査結
果を得た。Then, mold coating agents A-H shown in Table 1 were applied to the inner surface of the sand mold, a cylindrical high Cr cast iron casting with a product weight of 5 tons was cast, and the area of the burnt part and surface roughness were examined. We got the survey results.
表２によれば、本発明塗型剤Ａ−Ｅでは、焼着部か少な
く、肌荒れもなく、本発明の有効性が実証された。According to Table 2, mold coating agents A to E of the present invention had fewer burned areas and no rough skin, demonstrating the effectiveness of the present invention.
また、表１に示した塗型剤Ｂをロール鋳造用砂型の最表
面に塗布し、高Ｃｒ鋳鉄ロール（外径８２０ｍｍφ、鋳
込み重量１５．６ｔｏｎ ）を鋳造した結果、鋳物表面
には黒鉛がよく残留しており、焼着のない良好な鋳肌が
得られることを認めた。In addition, as a result of applying coating agent B shown in Table 1 to the outermost surface of a sand mold for roll casting and casting a high Cr cast iron roll (outer diameter 820 mmφ, casting weight 15.6 tons), graphite was well formed on the surface of the casting. It was confirmed that a good casting surface without burning was obtained.
［発明の効果］
以上のように本発明によれば、黒鉛塗型の酸化消耗か抑
制されると共に耐食性か向上するため、鋳造品の肌荒れ
や鋳型焼着等の鋳肌欠陥を防止できる。従って、鋳造時
の型バラシ及び仕上げ工数の大幅低減か可能となる。[Effects of the Invention] As described above, according to the present invention, the oxidative wear and tear of the graphite coating mold is suppressed and the corrosion resistance is improved, so that casting surface defects such as roughening of the surface of the cast product and mold burning can be prevented. Therefore, it is possible to significantly reduce mold break-up and finishing man-hours during casting.
Claims (2)
ｔ％からなる基材と、粘結剤と溶剤からなる希釈溶液と
を、混合して構成される鋳鉄鋳物用塗型剤。(1) Graphite powder 70-95wt% and Al powder 30-5w
A mold coating agent for cast iron foundries, which is composed of a base material consisting of t% and a diluted solution consisting of a binder and a solvent.
〜３０ｗｔ％含有する請求項１記載の鋳鉄鋳物用塗型剤
。(2) The diluted solution contains alumina sol as a binder.
The mold coating agent for cast iron castings according to claim 1, containing ~30 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257404A JP2989240B2 (en) | 1990-09-28 | 1990-09-28 | Coating agent for cast iron castings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2257404A JP2989240B2 (en) | 1990-09-28 | 1990-09-28 | Coating agent for cast iron castings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04138838A true JPH04138838A (en) | 1992-05-13 |
| JP2989240B2 JP2989240B2 (en) | 1999-12-13 |
Family
ID=17305909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2257404A Expired - Lifetime JP2989240B2 (en) | 1990-09-28 | 1990-09-28 | Coating agent for cast iron castings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2989240B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357648A (en) * | 2011-10-13 | 2012-02-22 | 李华山 | Chill coating for casting |
| CN104084530A (en) * | 2014-06-26 | 2014-10-08 | 宁夏共享装备有限公司 | Production method of water-based flow-coating painting for iron casting |
-
1990
- 1990-09-28 JP JP2257404A patent/JP2989240B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357648A (en) * | 2011-10-13 | 2012-02-22 | 李华山 | Chill coating for casting |
| CN104084530A (en) * | 2014-06-26 | 2014-10-08 | 宁夏共享装备有限公司 | Production method of water-based flow-coating painting for iron casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2989240B2 (en) | 1999-12-13 |
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