JPH09285839A - Manufacture of ceramic mold - Google Patents
Manufacture of ceramic moldInfo
- Publication number
- JPH09285839A JPH09285839A JP12627896A JP12627896A JPH09285839A JP H09285839 A JPH09285839 A JP H09285839A JP 12627896 A JP12627896 A JP 12627896A JP 12627896 A JP12627896 A JP 12627896A JP H09285839 A JPH09285839 A JP H09285839A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- ceramic
- model
- ceramic mold
- pattern
- 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
Landscapes
- Casting Devices For Molds (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、アルミニウム合金
材等の金属部品を鋳造するセラミック鋳型の製造方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ceramic mold for casting a metal part such as an aluminum alloy material.
【0002】[0002]
【従来の技術】自動車のトランスミッションやシリンダ
カバー等は軽量化の要求からアルミニウム化されてい
る。これの生産時にはダイキャスト(金型)で鋳造して
いるが、試作時には、製品模型の木型を作り、この木型
から砂型を作って形状固めしてアルミニウムの鋳造試作
品を製造している。2. Description of the Related Art Automotive transmissions, cylinder covers, and the like are made of aluminum because of the demand for weight reduction. At the time of production of this, it is cast by die casting (mold), but at the time of trial manufacture, a wooden model of the product model is made, a sand mold is made from this wooden mold and the shape is solidified to produce an aluminum casting prototype. .
【0003】しかしながら、試作段階での評価は生産時
のものを評価するのが前提であるが、生産時のダイキャ
スト(金型)で鋳造した製品と試作時の上記砂型で鋳造
した製品との間には製品の性質、例えば、製品寸法精
度,材料の強度や鋳物の肌の面粗度が相違して、製品の
評価が合わないことがあった。However, the evaluation at the trial production stage is based on the premise that the evaluation at the time of production is performed. However, a product cast by die casting (mold) at the time of production and a product cast by the sand mold at the time of trial production In the meantime, the properties of the product, for example, the dimensional accuracy of the product, the strength of the material, and the surface roughness of the surface of the casting are different, so that the product may not be evaluated.
【0004】そこで、鋳型模型にセラミックとバインダ
ーを混合したスラリーを流し込み、このスラリーがゲル
化してセラミック鋳型になった後に、鋳型模型から抜型
して焼成し、上型と下型とにセットして給湯を行うよう
にしたセラミック鋳型が用いられている。Therefore, a slurry in which a ceramic and a binder are mixed is poured into a mold model, and after this slurry is gelled into a ceramic mold, the mold is removed from the mold model and fired, and then set in an upper mold and a lower mold. A ceramic mold for hot water supply is used.
【0005】[0005]
【発明が解決しようとする課題】セラミック鋳型は実際
の生産時の鋳造製品が鋳造試作品として得られる利点が
あるが、このセラミック鋳型を鋳型模型で製造する場
合、スラリーがゲル化してセラミック鋳型になり、これ
を鋳型模型から抜型する際に、セラミック鋳型の強度に
対し離型抵抗の方が大きいため、セラミック鋳型が破損
(型落ち)する問題がある。この型破損はセラミック鋳
型と鋳型模型との境界面において、凹凸形状が存在して
いる場合に、セラミック鋳型に造形された凸部の欠損が
多々生じている。The ceramic mold has an advantage that a casting product at the time of actual production can be obtained as a casting prototype, but when this ceramic mold is manufactured by a mold model, the slurry is gelated to form a ceramic mold. When releasing this from the mold model, there is a problem that the ceramic mold is damaged (falls off) because the mold release resistance is larger than the strength of the ceramic mold. This mold breakage is often caused by the loss of the convex portion formed on the ceramic mold when the uneven shape exists at the boundary surface between the ceramic mold and the mold model.
【0006】本発明の目的は、簡単な方法により、鋳型
模型からセラミック鋳型を破損させることなく離型抜型
を可能にしたセラミック鋳型の製造方法を提供すること
である。It is an object of the present invention to provide a method for producing a ceramic mold which enables a mold release from a mold model without damaging the ceramic mold by a simple method.
【0007】[0007]
【課題を解決するための手段】上記の目的を達成するた
めの本発明のセラミック鋳型の製造方法は、鋳型模型に
セラミックとバインダーを混合したスラリーを流し込
み、このスラリーがゲル化してセラミック鋳型になった
後に、このセラミック鋳型と前記鋳型模型との境界面に
沿って高圧空気を送気してセラミック鋳型を鋳型模型よ
り離型抜型することを特徴とする。The method for producing a ceramic mold of the present invention to achieve the above object is to pour a slurry in which a ceramic and a binder are mixed into a mold model, and the slurry is gelated to form a ceramic mold. After that, high-pressure air is blown along the boundary surface between the ceramic mold and the mold model to release the ceramic mold from the mold model.
【0008】[0008]
【発明の実施の形態】以下本発明の実施例を図面に基づ
いて説明する。図1において、1は下型枠、2は上型枠
である。3は前記下型枠1内に装填された下セラミック
鋳型であり、4は前記上型枠2内に装填された上セラミ
ック鋳型である。この下型枠1,上型枠2内に装填され
た下セラミック鋳型3及び上セラミック鋳型4によっ
て、その合わせ面には製品を鋳造する空間部5が形成さ
れ、上セラミック鋳型4には前記空間部5に溶湯を流し
込むための湯口穴6と押し湯部7を有している。また、
図例の下セラミック鋳型3には、鋳造製品に溝を形成す
るための凸起3aが形成されている。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a lower mold and 2 is an upper mold. 3 is a lower ceramic mold loaded in the lower mold 1, and 4 is an upper ceramic mold loaded in the upper mold 2. A space 5 for casting a product is formed on the mating surface of the lower ceramic mold 3 and the upper ceramic mold 4 loaded in the lower mold 1 and the upper mold 2, and the space is formed in the upper ceramic mold 4. The portion 5 has a sprue hole 6 for pouring the molten metal and a riser portion 7. Also,
In the lower ceramic mold 3 shown in the figure, a protrusion 3a for forming a groove in a cast product is formed.
【0009】前記下セラミック鋳型3及び上セラミック
鋳型4は鋳型模型によって造型される。すなわち、上セ
ラミック鋳型4は図2で示すように、例えば、定盤10
の上に載置した枠14内に上セラミック鋳型4の鋳型模
型11を装填し、この鋳型模型11内にセラミックとバ
インダーを混合したスラリーを流し込む。The lower ceramic mold 3 and the upper ceramic mold 4 are molded by a mold model. That is, the upper ceramic mold 4 is, for example, as shown in FIG.
The mold model 11 of the upper ceramic mold 4 is loaded in the frame 14 placed on the top, and the slurry in which the ceramic and the binder are mixed is poured into the mold model 11.
【0010】また、下セラミック鋳型3は図3で示すよ
うに、例えば、定盤10の上に載置した枠14内に下セ
ラミック鋳型3の鋳型模型15を装填し、この鋳型模型
15内にセラミックとバインダーを混合したスラリーを
流し込む。Further, as shown in FIG. 3, the lower ceramic mold 3 is loaded with a mold model 15 of the lower ceramic mold 3 in a frame 14 placed on a surface plate 10, and the mold model 15 is placed in the mold model 15. Pour a slurry that is a mixture of ceramic and binder.
【0011】前記鋳型模型11,15は、成形が容易で
安価な発砲スチロール材が適当であり、製品の設計図面
等に基づいて製作する。The mold models 11 and 15 are preferably foamed polystyrene materials, which are easy to mold and inexpensive, and are manufactured based on design drawings of products.
【0012】セラミックとバインダーを混合したスラリ
ーの配合割合は次のものが適当である。 SiCセラミック粉 :85±5 Vo1% バインダー :15±3 Vo1% 硬化促進材 :0.5±0.2 Vo1%The following mixing ratio is suitable for the slurry in which the ceramic and the binder are mixed. SiC ceramic powder: 85 ± 5 Vo1% Binder: 15 ± 3 Vo1% Curing accelerator: 0.5 ± 0.2 Vo1%
【0013】前記鋳型模型11,15に流し込んだスラ
リーがゲル化(乾燥固化)して上セラミック鋳型4及び
下セラミック鋳型3なった後に、この上下セラミック鋳
型4,3と前記鋳型模型11,15との境界面12に沿
って高圧空気を送気して上下セラミック鋳型4,3を前
記鋳型模型11,15より離型抜型するのである。After the slurry poured into the mold models 11 and 15 is gelled (dried and solidified) to become the upper ceramic mold 4 and the lower ceramic mold 3, the upper and lower ceramic molds 4 and 3 and the mold models 11 and 15 are formed. The upper and lower ceramic molds 4 and 3 are released from the mold models 11 and 15 by sending high-pressure air along the boundary surface 12.
【0014】前記上下セラミック鋳型4,3と鋳型模型
11,15との境界面12に沿って高圧空気を送気する
手段としては、図2及び図3で示しように、鋳型模型1
1,15にエアベント13を設け、このエアベント13
より例えば7Kg/cm2の空気圧を送気する。As a means for supplying high-pressure air along the boundary surface 12 between the upper and lower ceramic molds 4, 3 and the mold models 11, 15, as shown in FIGS. 2 and 3, the mold model 1 is used.
1, 15 is provided with an air vent 13, and the air vent 13
For example, an air pressure of 7 kg / cm 2 is supplied.
【0015】前記エアベント13の設置位置は任意であ
るが、図例のように下セラミック鋳型3に鋳造製品に溝
を形成するための凸起3aを形成する場合には、その鋳
型模型15には図3及び図4で示すように、凸起3aを
形成するための凹部15aが形成されている。この凹部
15aから凸起3aを抜くときに離型抵抗によって欠損
しやすい。従って、このようなセラミック鋳型が離型抜
型の際に破損(型落ち)しやすい部位の鋳型模型15の
凹部15aにエアベント13を設けて凸起3aと凹部1
5aとの境界面に高圧空気を送気することが望ましい。The air vent 13 may be installed at any position, but when a protrusion 3a for forming a groove in a casting product is formed in the lower ceramic mold 3 as shown in the figure, the mold model 15 thereof is As shown in FIGS. 3 and 4, a recess 15a for forming the protrusion 3a is formed. When the protrusion 3a is removed from the recess 15a, it is likely to be damaged due to the release resistance. Therefore, the air vent 13 is provided in the concave portion 15a of the mold model 15 at a portion where such a ceramic mold is easily damaged (mold drop) at the time of releasing from the mold, and the protrusion 3a and the concave portion 1 are formed.
It is desirable to supply high-pressure air to the interface with 5a.
【0016】また、前記鋳型模型11,15の表面に予
めパラフィン系の離型剤を塗布しておくと、前記高圧空
気の送気と相俟ってセラミック鋳型の離型抜型がさらに
円滑に得られる。When a paraffin-based mold release agent is applied to the surfaces of the mold models 11 and 15 in advance, the mold release of the ceramic mold can be obtained more smoothly in combination with the supply of the high pressure air. To be
【0017】前記鋳型模型11,15から離型抜型した
上下セラミック鋳型4,3は第1次焼成を直火で3時間
行い、続いて第2次焼成を300〜400℃で3時間行
って完成する。The upper and lower ceramic molds 4 and 3 released from the mold models 11 and 15 are first fired for 3 hours by direct flame, and then second fired for 3 hours at 300 to 400 ° C. To do.
【0018】上記完成したセラミック鋳型4,3はその
まま鋳型として用いてもよいし、図1で示すように、上
型枠2,下枠型1に装填して入れ子として用いてもよ
い。The above-mentioned completed ceramic molds 4 and 3 may be used as they are as a mold, or as shown in FIG. 1, they may be loaded into an upper mold 2 and a lower frame mold 1 and used as a nest.
【0019】[0019]
【発明の効果】以上述べたように本発明によると、鋳型
模型にセラミックとバインダーを混合したスラリーを流
し込みセラミック鋳型を造形する場合、鋳型模型に流し
込んだスラリーが硬化した後に、セラミック鋳型と鋳型
模型との境界面に沿って高圧空気を送気することにより
セラミック鋳型の離型抜型が極めて円滑に得られ、鋳造
模型からセラミック鋳型を離型抜型するときのセラミッ
ク鋳型の破損(型落ち)が防止する利点を有している。As described above, according to the present invention, when a ceramic mixture is cast by pouring a slurry in which a ceramic and a binder are mixed into a mold model, the ceramic mold and the mold model are cured after the slurry poured into the mold model is cured. By releasing high-pressure air along the boundary surface between the mold and the mold, the mold release of the ceramic mold can be obtained very smoothly, and the damage (falling down) of the ceramic mold when releasing the mold from the cast model is prevented. Have the advantage of
【図1】セラミック鋳型の断面図FIG. 1 is a sectional view of a ceramic mold.
【図2】上セラミック鋳型の造形断面図[FIG. 2] Modeling cross-sectional view of the upper ceramic mold
【図3】下セラミック鋳型の造形断面図[Fig. 3] Modeling cross-sectional view of the lower ceramic mold
【図4】図3のA部拡大図FIG. 4 is an enlarged view of a portion A in FIG. 3;
1 下枠型 2 上枠型 3 下セラミック鋳型 4 上セラミック鋳型 5 空間部 6 湯口穴 7 押し湯部 10 定盤 11 鋳型模型 12 セラミック鋳型と鋳型模型との境界面 13 エアベント 14 枠 15 鋳型模型 1 Lower frame type 2 Upper frame type 3 Lower ceramic mold 4 Upper ceramic mold 5 Space part 6 Gate hole 7 Pushing part 10 Surface plate 11 Mold model 12 Interface between ceramic mold and mold model 13 Air vent 14 Frame 15 Mold model
Claims (1)
合したスラリーを流し込み、このスラリーがゲル化して
セラミック鋳型になった後に、このセラミック鋳型と前
記鋳型模型との境界面に沿って高圧空気を送気してセラ
ミック鋳型を鋳型模型より離型抜型することを特徴とす
るセラミック鋳型の製造方法。1. A slurry containing a mixture of ceramic and a binder is poured into a mold model, and after the slurry is gelated to form a ceramic mold, high-pressure air is blown along the boundary surface between the ceramic mold and the mold model. Then, the ceramic mold is released from the mold model.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12627896A JP3300743B2 (en) | 1996-04-24 | 1996-04-24 | Manufacturing method of ceramic mold |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12627896A JP3300743B2 (en) | 1996-04-24 | 1996-04-24 | Manufacturing method of ceramic mold |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09285839A true JPH09285839A (en) | 1997-11-04 |
JP3300743B2 JP3300743B2 (en) | 2002-07-08 |
Family
ID=14931258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12627896A Expired - Fee Related JP3300743B2 (en) | 1996-04-24 | 1996-04-24 | Manufacturing method of ceramic mold |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3300743B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9863254B2 (en) | 2012-04-23 | 2018-01-09 | General Electric Company | Turbine airfoil with local wall thickness control |
-
1996
- 1996-04-24 JP JP12627896A patent/JP3300743B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9863254B2 (en) | 2012-04-23 | 2018-01-09 | General Electric Company | Turbine airfoil with local wall thickness control |
Also Published As
Publication number | Publication date |
---|---|
JP3300743B2 (en) | 2002-07-08 |
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