JPS6358082B2 - - Google Patents
Info
- Publication number
- JPS6358082B2 JPS6358082B2 JP6524580A JP6524580A JPS6358082B2 JP S6358082 B2 JPS6358082 B2 JP S6358082B2 JP 6524580 A JP6524580 A JP 6524580A JP 6524580 A JP6524580 A JP 6524580A JP S6358082 B2 JPS6358082 B2 JP S6358082B2
- Authority
- JP
- Japan
- Prior art keywords
- model
- water
- mold
- slurry
- gypsum
- 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
Links
- 229910052602 gypsum Inorganic materials 0.000 claims description 22
- 239000010440 gypsum Substances 0.000 claims description 22
- 239000011505 plaster Substances 0.000 claims description 21
- 239000002002 slurry Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002195 soluble material Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 230000009970 fire resistant effect Effects 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 238000005495 investment casting Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000003756 stirring Methods 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
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Description
【発明の詳細な説明】
本発明は精密鋳造用石膏鋳型の造型法に関する
ものであり、より詳細に述べるならば、水溶性の
模型を用いて石膏鋳型を造型する方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of making a gypsum mold for precision casting, and more specifically, to a method of making a gypsum mold using a water-soluble model.
石膏鋳型は古くから美術装飾品の鋳造に用いら
れており、近年は非鉄鋳物の精密鋳造用鋳型とし
ても用いられるようになつた。石膏を用いて精密
鋳型を造型する一般的な工程としては、枠内にセ
ツトした模型上に水と石膏とを混合撹拌したスラ
リーを流し込みそして硬化させ、模型を除去して
鋳物製品と同形状のキヤビテイを有する石膏鋳型
とし、次に、この石膏鋳型を乾燥する。そして、
模型にワツクスのような消失模型を使用する場合
には、石膏鋳型の乾燥と同時に融出させて模型を
除去し、また、ゴムのようなフレキシブルな模型
を使用する場合には、硬化後に抜きとることで模
型を除去する。 Gypsum molds have been used for casting decorative objects since ancient times, and in recent years they have also come to be used as precision casting molds for non-ferrous castings. The general process for making precision molds using plaster is to pour a slurry made by mixing and stirring water and plaster onto a model set in a frame and harden it, then remove the model and create a mold with the same shape as the cast product. A plaster mold with a cavity is formed, and then this plaster mold is dried. and,
If a disappearing model such as wax is used for the model, it is melted and removed at the same time as the plaster mold dries, and if a flexible model such as rubber is used, it is removed after it hardens. This will remove the model.
模型上に流し込む石膏のスラリーが水を含んで
いるために、模型形成材料として水溶性材料を使
用することはできないとされてきた。これは、水
溶性の模型が石膏のスラリー中の水分によつて溶
けて模型表面ひいては製品肌が荒れてしまうから
である。そのために、模型として好ましい特性
（例えば、ワツクスよりも強度の高い、石膏の水
和凝結時に生じる反応熱に対してもワツクスより
も熱変形の小さい）を有している水溶性樹脂を模
型材料として用いることはできない。そして、こ
のような水溶性樹脂とは、尿素を主体とした混合
物が一例としてあげられる。 It has been argued that water-soluble materials cannot be used as model-forming materials because the plaster slurry that is poured onto the model contains water. This is because the water-soluble model is dissolved by the water in the plaster slurry, causing the surface of the model and, ultimately, the surface of the product to become rough. For this purpose, water-soluble resins are used as model materials because they have properties that are desirable for models (for example, they have higher strength than wax and are less thermally deformed than wax due to the reaction heat generated during hydration and condensation of gypsum). It cannot be used. An example of such a water-soluble resin is a mixture containing urea as a main component.
本発明の目的は、水溶性の模型を用いて精密鋳
造用石膏鋳型を造型する方法を提供することであ
る。 An object of the present invention is to provide a method for molding a gypsum mold for precision casting using a water-soluble model.
上述の目的が、石膏鋳型造型法において、混水
した石膏のスラリーを注ぎ込む前に、水溶性の模
型にバインダと耐火物粉末とからなるスラリーを
浸漬被覆しそして乾燥硬化させて石膏スラリー中
の水分が水溶性の模型に達しないことを、また、
達しても鋳型表面性状が損なれいことを特徴とす
る石膏鋳型造型法によつて達成される。 The above purpose is to apply a slurry of binder and refractory powder to a water-soluble model before pouring the slurry of gypsum mixed with water in the gypsum casting mold manufacturing method, and dry and harden the slurry to remove the moisture in the gypsum slurry. Also, it is assumed that
This is achieved by a plaster mold making method that is characterized by the fact that even if the surface of the mold is reached, the surface quality of the mold is not damaged.
硬化後の石膏鋳型から水溶性の模型を除去する
には、石膏鋳型の加熱乾燥時にその加熱温度にて
模型を融出すればよい。 In order to remove the water-soluble model from the hardened plaster mold, the model may be melted at the heating temperature when the plaster mold is heated and dried.
以下、添付図面に関連した実施例および実施態
様例で本発明をさらに説明する。 In the following, the invention will be further explained by means of examples and exemplary embodiments in connection with the accompanying drawings, in which: FIG.
実施例
高強度でかつ模型成形時に低収縮率である水溶
性樹脂（尿素混合物）を用いて射出成形によつて
模型を形成した。この模型の強度は約30Kg／cm2で
あり、表面粗さは約5Zであつた。この模型を耐
火性バインダと無機質の耐火物粉末とからなるス
ラリーに浸漬して被覆を模型表面に形成した。な
お、スラリーはバインダにエチルシリケート４０
を用いかつ耐火物粉末325メツシユ程度のジルコ
ン砂を用いて混合してつくつた。このスラリーへ
の浸漬、引上げ、乾燥を２回繰返して厚さ約1.5
mmの被覆を形成した。次に、この模型を枠内で定
盤上に配置した。そして、この枠内へ混水した石
膏のスラリーを注ぎ満たした。なお、この石膏ス
ラリーには鋳型の熱伝導性を改善するために添加
剤（けい砂、ジルコサンド等）を加えた。このと
きの状態を第１図の概略断面図に示す。第１図に
おいて、１が水溶性の模型、２が耐火性被覆、３
が石膏、４が枠そして５が定盤である。石膏が硬
化した後に枠および定盤から石膏鋳型を模型と共
に取り出して乾燥炉へ入れた。この乾燥炉で約
500℃の温度で30分間加熱し、その際に石膏鋳型
内の模型が融出した。このようにして精密鋳造用
の石膏鋳型が完成した。Example A model was formed by injection molding using a water-soluble resin (urea mixture) that has high strength and a low shrinkage rate during model molding. The strength of this model was approximately 30 kg/cm 2 and the surface roughness was approximately 5Z. This model was immersed in a slurry consisting of a refractory binder and an inorganic refractory powder to form a coating on the model surface. In addition, the slurry contains ethyl silicate 40 as a binder.
It was made by mixing refractory powder with 325 mesh of zircon sand. The process of dipping into this slurry, pulling up, and drying was repeated twice until the thickness was approximately 1.5 mm.
A coating of mm was formed. Next, this model was placed on a surface plate within the frame. Then, a slurry of gypsum mixed with water was poured into this frame to fill it. Note that additives (silica sand, zirco sand, etc.) were added to this gypsum slurry in order to improve the thermal conductivity of the mold. The state at this time is shown in the schematic sectional view of FIG. In Figure 1, 1 is a water-soluble model, 2 is a fire-resistant coating, and 3 is a water-soluble model.
is plaster, 4 is the frame, and 5 is the surface plate. After the plaster had hardened, the plaster mold was removed from the frame and surface plate along with the model and placed in a drying oven. With this drying oven, approx.
It was heated at a temperature of 500°C for 30 minutes, during which time the model inside the plaster mold melted. In this way, a plaster mold for precision casting was completed.
本発明にしたがつて造型した石膏鋳型の表面粗
さを電気的触針式粗さ測定機で測定したところ
8Zであつた。なお、水溶性の模型表面の粗さは
前述のごとく5Zであつた。比較のために前述し
た水溶性の模型の表面に耐火性被覆を付けること
なく模型の上に直接石膏スラリーを注いで石膏鋳
型を造型した。この場合の石膏鋳型の表面粗さは
電気的触針式粗さ測定機では測定できないほど粗
かつた。 The surface roughness of a gypsum mold made according to the present invention was measured using an electric stylus roughness measuring machine.
It was 8Z. The surface roughness of the water-soluble model was 5Z as described above. For comparison, a gypsum mold was made by pouring gypsum slurry directly onto the water-soluble model described above without applying a fire-resistant coating to the surface. The surface roughness of the gypsum mold in this case was so rough that it could not be measured with an electric stylus roughness meter.
上述の石膏鋳型表面粗さの結果から明らかなよ
うに本発明にしたがつて水溶性の模型表面に耐火
性被覆を施すことによつて、石膏スラリー中の水
分の浸透を防ぐので水溶性の模型表面が浸食、損
傷されず結果として非常に滑らかな鋳型肌が得ら
れる。 As is clear from the results of the surface roughness of the gypsum mold described above, by applying a fire-resistant coating to the surface of the water-soluble model according to the present invention, penetration of water in the gypsum slurry is prevented. The surface is not eroded or damaged, resulting in a very smooth mold skin.
また、高張度の水溶性の模型であるので、従来
のワツクス製模型と比べて変形、破損することな
く容易に取扱うことができ作業性が良くなる。さ
らに、従来は発泡石膏を用いると模型表面に微小
な気泡が付着して鋳型肌を悪くする場合があり、
発泡石膏の取扱いに特に注意を用したが、本発明
の場合には耐火性被覆が模型表面に形成してある
ので容易に発泡石膏を使用することができる。そ
して、耐火性被覆は薄いために発泡石膏鋳型の利
点である良好な通気度を損うこともない。 Furthermore, since it is a water-soluble model with high tension, it can be easily handled without being deformed or damaged, which improves workability compared to conventional wax models. Furthermore, conventionally, when foamed gypsum is used, minute air bubbles may adhere to the surface of the model, which may worsen the surface of the mold.
Particular care was taken in handling the foamed gypsum, but in the case of the present invention, foamed gypsum can be easily used since a fire-resistant coating is formed on the model surface. Furthermore, since the refractory coating is thin, it does not compromise the good air permeability that is an advantage of foamed gypsum molds.
第１図は本発明にしたがつて造型する石膏鋳型
の概略断面図である。
１…水溶性の模型、２…耐火性被覆、３…石
膏、４…枠、５…定盤。
FIG. 1 is a schematic cross-sectional view of a plaster mold formed according to the present invention. 1... Water-soluble model, 2... Fire-resistant coating, 3... Plaster, 4... Frame, 5... Surface plate.
Claims (1)
型法において、模型を水溶性材料で形成し、この
模型にバインダと耐火物粉末とからなるスラリー
を浸漬被覆しそして乾燥硬化させ、前記石膏のス
ラリーを前記模型上に注ぎそして硬化させ、次
に、前記模型を除去することを特徴とする石膏鋳
型造型法。 ２ 前記模型を前記石膏鋳型の加熱乾燥時にその
加熱温度にて融出して除去することを特徴とする
特許請求の範囲第１項記載の石膏鋳型造型法。[Claims] 1. In a gypsum mold making method using a slurry of gypsum mixed with water, a model is formed from a water-soluble material, a slurry consisting of a binder and a refractory powder is dip-coated on the model, and the slurry is dried and hardened. . A method of making a plaster mold, characterized in that the plaster slurry is poured onto the model and allowed to harden, and then the model is removed. 2. The plaster mold making method according to claim 1, wherein the model is melted and removed at the heating temperature when heating and drying the plaster mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6524580A JPS56161106A (en) | 1980-05-19 | 1980-05-19 | Molding method for gyps mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6524580A JPS56161106A (en) | 1980-05-19 | 1980-05-19 | Molding method for gyps mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56161106A JPS56161106A (en) | 1981-12-11 |
| JPS6358082B2 true JPS6358082B2 (en) | 1988-11-15 |
Family
ID=13281327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6524580A Granted JPS56161106A (en) | 1980-05-19 | 1980-05-19 | Molding method for gyps mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56161106A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6038110A (en) * | 1983-08-11 | 1985-02-27 | 株式会社ノリタケカンパニーリミテド | Method of casting and molding ceramic product |
| JPS60259407A (en) * | 1984-06-06 | 1985-12-21 | 株式会社ノリタケカンパニーリミテド | Casting molding method of ceramic product |
| JPS63247002A (en) * | 1987-04-03 | 1988-10-13 | 日本碍子株式会社 | Ceramics casting molding method |
| JP6357972B2 (en) * | 2014-08-25 | 2018-07-18 | 三吉 秀征 | Mold wall surface forming and assembling frame member for molding, and method for assembling the mold member |
-
1980
- 1980-05-19 JP JP6524580A patent/JPS56161106A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56161106A (en) | 1981-12-11 |
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