JPH05104198A - Method for decomposing mold - Google Patents
Method for decomposing moldInfo
- Publication number
- JPH05104198A JPH05104198A JP29835191A JP29835191A JPH05104198A JP H05104198 A JPH05104198 A JP H05104198A JP 29835191 A JP29835191 A JP 29835191A JP 29835191 A JP29835191 A JP 29835191A JP H05104198 A JPH05104198 A JP H05104198A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- steam
- water
- calcium carbonate
- time
- 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
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は主としてロストワックス
法によって製造された鋳型の解体方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method for disassembling a mold produced by the lost wax method.
【０００２】[0002]
【従来の技術】ロストワックス法とは、幹状のスプルー
形成部と、該スプルー形成部から樹枝状に分岐した目的
製品形状を有する製品形状部とからなるツリーと呼ばれ
る模型をワックスによって作成し、該模型の周囲に通常
コロイダルシリカを水に分散させたスラリーを塗布し、
その上からスタッコ材と云われる耐火物粒子を付着させ
乾燥するスタッコイングを行ない、再びスラリー塗布、
スタッコイングを行ない、このような工程を数回繰返し
て生型を作成し、該生型を加熱してワックスを除去した
後焼成することによって製造される鋳型を使用して鋳造
を行なう方法であり、特に精密な鋳造物の製造に適した
ものである。2. Description of the Related Art The lost wax method is a wax-made model called a tree consisting of a stem-shaped sprue forming part and a product shape part having a target product shape branched from the sprue forming part in a dendritic form, A slurry in which colloidal silica is usually dispersed in water is applied around the model,
On top of that, stuccoing is performed by adhering refractory particles called stucco material and drying, and slurry is applied again.
This is a method of performing stuccoing, repeating such steps several times to create a green mold, heating the green mold to remove wax, and then firing the mold to make a casting. , Especially suitable for the production of precision castings.
【０００３】上記ロストワックス法における鋳型による
鋳造物は上記したように精密形状を有するものが多く、
したがって鋳造後に鋳型を容易に崩壊することが出来る
ことが要求される。Many of the castings by the mold in the above lost wax method have a precise shape as described above,
Therefore, it is required that the mold can be easily collapsed after casting.
【０００４】従来はスタッコ材としてシャモットサンド
やムライトサンドが使用されていたが、鋳型の崩壊性を
改良するためにスタッコ材として炭酸カルシウム粒を用
い、これを一層以上に適用した鋳型が提案されている
（特願平３−３３４２号）。Conventionally, chamotte sand or mullite sand was used as a stucco material, but in order to improve the disintegration property of the mold, calcium carbonate particles were used as a stucco material, and a mold in which this was further applied was proposed. (Japanese Patent Application No. 3-3342).
【０００５】上記改良においては、鋳型焼成時にスタッ
コ材である炭酸カルシウムＣaＣＯ3がＣaＯに熱分解
し、その際に発生するＣＯ2 によって鋳型はポーラスに
なる。鋳造後、該鋳型を解体して製品を取出すのである
が、解体の方法としては該鋳型を水に浸漬するかまたは
鋳型に撒水することによって水と接触させる。このよう
にして鋳型に水を接触させるとポーラス状の鋳型に水が
浸透してＣaＯと反応してＣa(ＯＨ)2が生成し、この際
の膨張力によって鋳型に亀裂を生ずるかまたは完全に崩
壊する。更に水接触時に高温状態におくと、鋳型内の空
孔に侵入した水が急激に蒸気化するために膨張力以外に
爆裂力も発生して鋳型は更に崩壊し易くなる。In the above improvement, the calcium carbonate CaCO 3 which is a stucco material is thermally decomposed into CaO during firing of the mold, and CO 2 generated at that time causes the mold to become porous. After casting, the mold is disassembled and the product is taken out. As a disassembling method, the mold is soaked in water or sprinkled on the mold to bring it into contact with water. When water is brought into contact with the mold in this way, water permeates into the porous mold and reacts with CaO to produce Ca (OH) 2 , and the expansive force at this time causes the mold to crack or completely Collapse. Further, if the mold is kept in a high temperature state during contact with water, the water that has entered the pores in the mold is rapidly vaporized, and explosive force is also generated in addition to the expansion force, and the mold is more likely to collapse.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記鋳
型解体方法では鋳型を水に浸漬したり、鋳型に撒水する
時間の的確なコントロールが重要であり、浸漬または撒
水の時間が短かすぎる場合はＣaＯ層での水蒸気発生が
不充分であるために鋳型が崩壊しにくゝ、反面長過ぎる
場合はＣaＯがＣa(ＯＨ)2に変化するために必要な水以
上に過剰の水が鋳型に含浸され、Ｃa(ＯＨ)2生成にとも
なう膨張力が低下してやはり鋳型が崩壊しにくゝなる。
また鋳型を解体して取出した製品に付着している鋳型の
砂を除去するためにサンドブラストやショットブラスト
による砂落としを行なうが、鋳型に過剰の水が含浸され
ている場合には砂落とし前の乾燥が必要になる。However, in the above method of disassembling the mold, it is important to precisely control the time of immersing the mold in water or watering the mold, and when the time of dipping or watering is too short, CaO is used. Insufficient water vapor generation in the layer causes the mold to collapse. On the other hand, if the mold is too long, CaO changes to Ca (OH) 2 and the mold is impregnated with excess water. , Ca (OH) 2 formation reduces the expansive force, and the mold does not collapse easily.
In addition, sand is removed by sand blasting or shot blasting in order to remove the sand of the mold adhering to the product taken out by disassembling the mold, but if the mold is impregnated with excess water, dry before sand removal Will be required.
【０００７】[0007]
【課題を解決するための手段】本発明は上記従来の課題
を解決するための手段として、炭酸カルシウム粒を含む
鋳型の解体を行なう場合、１Kg／cm2 以上の圧力の水蒸
気に接触せしめるものである。[Means for Solving the Problems] As a means for solving the above-mentioned conventional problems, the present invention comprises contacting with steam having a pressure of 1 kg / cm 2 or more when disassembling a mold containing calcium carbonate particles. is there.
【０００８】本発明において、炭酸カルシウム粒を含む
鋳型を製造するには、スラリー中に炭酸カルシウム粒を
混合する方法、炭酸カルシウム粒からなるスタッコ材を
一層以上に適用する方法、炭酸カルシウム粒と従来のス
タッコ材であるシャモットサンド、シリカサンド、ムラ
イトサンド、ジルコンサンド等に混合した混合スタッコ
材を一層以上に適用する方法、上記方法を二つ以上組合
わせた方法等が適用されるが、炭酸カルシウム粒と従来
のスタッコ材とを混合した混合スタッコ材を用いる場合
には、炭酸カルシウム粒を１０〜８０重量％、望ましく
は２０〜５０重量％含むものが望ましい。In the present invention, to produce a mold containing calcium carbonate particles, a method of mixing calcium carbonate particles in a slurry, a method of applying stucco material composed of calcium carbonate particles in one or more layers, calcium carbonate particles and conventional methods are used. The method of applying a mixed stucco material mixed with chamotte sand, silica sand, mullite sand, zircon sand, etc., which are stucco materials of 1 or more, a method of combining two or more of the above methods, etc. In the case of using a mixed stucco material in which particles and a conventional stucco material are mixed, it is desirable to contain calcium carbonate particles in an amount of 10 to 80% by weight, preferably 20 to 50% by weight.
【０００９】本発明においては、上記鋳型は鋳造後解体
されるが、この場合上記鋳型に１Kg／cm2 以上の圧力の
水蒸気を接触せしめる。具体的には上記鋳型を圧力容器
内に入れ、該圧力容器に１Kg／cm2 以上の圧力の水蒸気
を圧入する。上記水蒸気との接触によって鋳型に含まれ
る酸化カルシウムは水酸化カルシウムとなり、この際の
膨張力によって鋳型は崩壊する。In the present invention, the mold is dismantled after casting, but in this case, steam having a pressure of 1 kg / cm 2 or more is brought into contact with the mold. Specifically, the above mold is placed in a pressure vessel, and water vapor having a pressure of 1 kg / cm 2 or more is pressed into the pressure vessel. Upon contact with the steam, the calcium oxide contained in the mold becomes calcium hydroxide, and the expanding force at this time causes the mold to collapse.
【００１０】[0010]
【作用】本発明では鋳型を解体する際に１Kg／cm2 以上
の圧力の水蒸気を接触させることにより、酸化カルシウ
ムを水酸化カルシウムとし、この際の膨張力によって鋳
型を崩壊せしめるのであるが、水蒸気圧力が１Kg／cm2
以上では処理時間が長くても鋳型内における水蒸気の凝
縮による液相の生成がなく、したがって鋳型内に過剰の
水が含まれることがなくなる。そして鋳型の崩壊の程度
も従来の水浸漬または撒水と比べて同等またはそれ以上
である。In the present invention, when the mold is dismantled, by contacting steam with a pressure of 1 kg / cm 2 or more, calcium oxide becomes calcium hydroxide, and the expansive force at this time causes the mold to collapse. Pressure is 1 kg / cm 2
As described above, even if the treatment time is long, there is no generation of a liquid phase due to condensation of water vapor in the mold, and therefore, excess water is not contained in the mold. The degree of collapse of the mold is also equal to or higher than that of the conventional water immersion or sprinkling.
【００１１】[0011]
【実施例】下記スタッコ材を使用してワックス模型の周
りに生型を形成する。 １〜３層：ジルコンサンド ４，５層：炭酸カルシウム粒 ６〜８層：シャモットサンド 使用したスラリーは従来のコロイダルシリカ分散スラリ
ーである。上記生型を加熱してワックスを溶解除去した
後１０００℃で２時間焼成して鋳型を製造した。EXAMPLE A green mold is formed around a wax model using the following stucco material. 1-3 layers: zircon sand 4,5 layers: calcium carbonate particles 6-8 layers: chamotte sand The slurry used is a conventional colloidal silica dispersion slurry. The raw mold was heated to dissolve and remove the wax, and then baked at 1000 ° C. for 2 hours to manufacture a mold.
【００１２】このようにして得られた鋳型を用いて減圧
吸引鋳造法によって溶鋼を鋳込んだ。鋳造後に鋳型温度
２００℃および６００℃で水浸漬（従来法）およびオー
トクレーブ中で７Kg／cm2 の水蒸気を作用させて（本発
明の方法）、鋳型の解体を行なった。この場合の鋳型の
崩壊状況と水酸化カルシウム層での過剰水の生成の有無
も表１に示す。Molten steel was cast by the vacuum suction casting method using the mold thus obtained. After casting, the mold was disassembled by immersing it in water at a mold temperature of 200 ° C. and 600 ° C. (conventional method) and by applying 7 kg / cm 2 of water vapor in the autoclave (method of the present invention). Table 1 also shows the state of template collapse and the presence or absence of excess water formation in the calcium hydroxide layer.
【００１３】[0013]
【表１】 ＊崩壊度合：◎ 鋳型全体が完全に崩壊 ○ 鋳型の一部が崩壊 △ 鋳型に大亀裂が生成するも崩壊には至らず[Table 1] * Collapse level: ◎ The entire mold completely collapsed ○ Part of the mold collapsed △ Even though a large crack was generated in the mold, it did not collapse
【００１４】表１をみれば、従来法では水処理時間によ
り鋳型の崩壊度合が影響されまた長時間の場合は過剰水
の生成がみられるが、本発明の方法では処理時間によら
ず良好な鋳型の崩壊がみられまた過剰水の生成もみられ
ない。As shown in Table 1, in the conventional method, the degree of mold disintegration was affected by the water treatment time, and excess water was generated in the case of a long time. However, the method of the present invention is good regardless of the treatment time. No mold collapse and no excess water formation.
【００１５】[0015]
【発明の効果】したがって本発明においては、処理時間
の厳密なコントロールの必要なく、解体時に鋳型の良好
な崩壊性が得られ、また過剰水の生成もないので製品を
乾燥することなくそのまゝショットブラストやサンドブ
ラスト等の次工程に流すことが出来る。Therefore, in the present invention, it is not necessary to strictly control the treatment time, a good disintegration property of the mold is obtained at the time of dismantling, and excess water is not generated, so that the product can be maintained without being dried. It can be passed to the next process such as shot blasting or sand blasting.
Claims (1)
Kg／cm2以上の水蒸気に接触せしめることによって解体
を行なうことを特徴とする鋳型の解体方法1. A pressure of 1 after casting calcium carbonate particles into a mold.
A method for disassembling a mold, characterized in that disassembling is carried out by bringing it into contact with steam of Kg / cm 2 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03298351A JP3136708B2 (en) | 1991-10-16 | 1991-10-16 | Mold dismantling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03298351A JP3136708B2 (en) | 1991-10-16 | 1991-10-16 | Mold dismantling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05104198A true JPH05104198A (en) | 1993-04-27 |
| JP3136708B2 JP3136708B2 (en) | 2001-02-19 |
Family
ID=17858561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03298351A Expired - Lifetime JP3136708B2 (en) | 1991-10-16 | 1991-10-16 | Mold dismantling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3136708B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0890146A (en) * | 1994-06-09 | 1996-04-09 | Masaru Nemoto | Casting method using synthetic resin core and synthetic resin core |
| US6901989B1 (en) | 1997-08-28 | 2005-06-07 | General Motors Corporation | Removing lost foam pattern coating residue from a casting |
-
1991
- 1991-10-16 JP JP03298351A patent/JP3136708B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0890146A (en) * | 1994-06-09 | 1996-04-09 | Masaru Nemoto | Casting method using synthetic resin core and synthetic resin core |
| US6901989B1 (en) | 1997-08-28 | 2005-06-07 | General Motors Corporation | Removing lost foam pattern coating residue from a casting |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3136708B2 (en) | 2001-02-19 |
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