JPH03248740A - Mould molding method - Google Patents
Mould molding methodInfo
- Publication number
- JPH03248740A JPH03248740A JP4095390A JP4095390A JPH03248740A JP H03248740 A JPH03248740 A JP H03248740A JP 4095390 A JP4095390 A JP 4095390A JP 4095390 A JP4095390 A JP 4095390A JP H03248740 A JPH03248740 A JP H03248740A
- Authority
- JP
- Japan
- Prior art keywords
- inorganic binder
- mold
- drying
- binder
- making method
- 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
- 238000000034 method Methods 0.000 title claims description 37
- 238000000465 moulding Methods 0.000 title abstract description 5
- 239000011230 binding agent Substances 0.000 claims abstract description 61
- 238000001035 drying Methods 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 25
- 238000005470 impregnation Methods 0.000 claims description 14
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 239000005416 organic matter Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 229920000592 inorganic polymer Polymers 0.000 claims description 2
- 239000002491 polymer binding agent Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 47
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052681 coesite Inorganic materials 0.000 abstract description 7
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 7
- 229910052682 stishovite Inorganic materials 0.000 abstract description 7
- 229910052905 tridymite Inorganic materials 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000000377 silicon dioxide Substances 0.000 abstract description 6
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 5
- 239000003110 molding sand Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 12
- 239000008119 colloidal silica Substances 0.000 description 10
- 238000010304 firing Methods 0.000 description 6
- 238000005495 investment casting Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 238000005488 sandblasting Methods 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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、鋳型造型法に関し、さらに詳しくは生産性に
優れ、溶湯注入後の砂落ち性が良い鋳型造型法に関する
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold making method, and more particularly to a mold making method that is excellent in productivity and has good sand removal properties after pouring molten metal.
〔従来の技術と発明が解決しようとする課題〕鋳物の生
産性を上げるため、有機系バインダーを使用した鋳型造
型プロセスが有るか（シェルモールド法、コールドボッ
クス法など）、これらの造型法によって作られた鋳型は
、特に中子として使用された場合、有機物によりガス欠
陥が発生し易い問題がある。一方、無機系バインダーに
よる鋳型を使用すれば、生産性が非常に悪く、溶湯注入
後の砂落ちが非常に悪いという問題がある。[Problems to be solved by conventional technology and inventions] In order to increase the productivity of castings, is there a mold making process that uses an organic binder (shell mold method, cold box method, etc.)? Especially when the mold is used as a core, there is a problem that gas defects are likely to occur due to organic matter. On the other hand, if a mold made of an inorganic binder is used, there are problems in that productivity is very low and sand falls off after pouring the molten metal.
従って、本発明の目的は、生産性が良く、鋳型からのガ
ス発生が少なく、溶湯注入後の砂落ち性が良い鋳型造型
法を提供することにある。Therefore, an object of the present invention is to provide a mold making method that has good productivity, generates less gas from the mold, and has good sand removal properties after pouring the molten metal.
ところで、有機系バインダーと無機系バインダーの両方
を利用する方法は既に提案されている（特公昭５１−３
１２０９号、特開昭８３−２４２４３９号及び特開平１
−１４８４３８号）。特に、特公昭５１−３１２０９号
公報及び特開平１−１４８４３８号公報には、耐火砂に
有機質粘結剤を加えて成形し、−旦焼成した多孔質の中
子基体にコロイダルシリカ溶液（特公昭５１−３１２０
９号）又はコロイダルシリカとアミン系有機物とからな
る結合剤（特開平１−１４８４３８号）を含浸させてな
る精密鋳造用中子か記載されている。しかしながら、こ
れらの中子は、ロストワックス法等による精密鋳造用と
して使用される精密鋳造用中子であり、高温に加熱して
鋳湯した場合における高い抗圧力を得ることを狙いとす
るものである。従って、高温での結合強度維持には富む
か、冷却時の抗圧力は特開平１−１４８４３８号の実施
例で報告されているように２〜１２ｋｇ／ｃ−とかなり
低い。これはコロイダルシリカを含浸させたことに起因
するものであり、常温での低圧力を３０〜１００ｋｇ／
ｃ−程度必要とする通常の鋳型としては用いることかで
きない。By the way, a method using both an organic binder and an inorganic binder has already been proposed (Japanese Patent Publication No. 51-3).
No. 1209, JP-A-83-242439 and JP-A-1
-148438). In particular, in Japanese Patent Publication No. 31209/1983 and Japanese Patent Application Laid-open No. 148438/1999, a colloidal silica solution (Japanese Patent Application Publication No. 1987-1988) is proposed to be applied to a porous core substrate formed by adding an organic binder to refractory sand and then fired. 51-3120
No. 9) or a precision casting core impregnated with a binder consisting of colloidal silica and an amine-based organic substance (Japanese Patent Application Laid-Open No. 148438/1999). However, these cores are precision casting cores used for precision casting using the lost wax method, etc., and are intended to obtain high resistance pressure when heated to high temperatures and cast. be. Therefore, the bond strength is well maintained at high temperatures, and the coercive pressure during cooling is quite low at 2 to 12 kg/c as reported in the examples of JP-A No. 1-148438. This is due to the impregnation with colloidal silica, and the low pressure at room temperature is 30 to 100 kg/
It cannot be used as a normal mold requiring c-grade.
本発明は、上記ロストワックス法等による精密鋳造用と
は異なり、常温において充分な強度を有すると共に、溶
湯注入後の砂落ち性が良い鋳型を造型しようとするもの
である。The present invention aims to create a mold that has sufficient strength at room temperature and has good sand removal properties after pouring the molten metal, unlike precision casting molds using the lost wax method and the like.
本発明によれば、上記目的を達成するため、特殊無機粘
結剤を用いることを特徴とする方法と、無機粘結剤含浸
後の乾燥を減圧マイクロ波加熱による乾燥で行なうこと
を特徴とする方法が提供される。According to the present invention, in order to achieve the above object, a method is characterized in that a special inorganic binder is used, and the drying after impregnation with the inorganic binder is performed by drying by vacuum heating with microwaves. A method is provided.
すなわち、本発明の第一発明によれば、鋳物砂に有機質
粘結剤を加えて造型した鋳型に、ＳｉＯ２／Ｎａ２Ｏモ
ル比か４．５〜６．０の無機粘結剤を含浸させ、乾燥後
、大気中高温下で有機物を燃焼させ、無機粘結剤で鋳型
形状を保持するようにしたことを特徴とする鋳型造型法
が提供される。この場合、乾燥は自然乾燥、低温乾燥又
は減圧マイクロ波乾燥のいずれの方法によってもよい。That is, according to the first aspect of the present invention, a mold made by adding an organic binder to foundry sand is impregnated with an inorganic binder at a SiO2/Na2O molar ratio of 4.5 to 6.0, and then dried. There is then provided a mold making method characterized in that the organic matter is burned in the atmosphere at high temperatures and the shape of the mold is maintained with an inorganic binder. In this case, drying may be carried out by any method such as natural drying, low temperature drying or vacuum drying using microwave drying.
本発明の第二発明によれば、鋳物砂に有機質粘結剤を加
えて造型した鋳型に無機粘結剤を含浸させ、減圧マイク
ロ波乾燥を行なった後、大気中高温下で有機物を燃焼さ
せ、無機粘結剤で鋳型形状を保持するようにしたことを
特徴とする鋳型造型法が提供される。According to the second aspect of the present invention, a mold made by adding an organic binder to foundry sand is impregnated with an inorganic binder, and after vacuum drying with microwaves, the organic matter is combusted in the atmosphere at high temperature. Provided is a mold making method characterized in that the shape of the mold is held by an inorganic binder.
なお、上記いずれの方法においても、無機粘結剤の含浸
層の厚さは、無機粘結剤の含浸を真空減圧下で行ない、
圧力と含浸時間により含浸層の厚さを調整するか、ある
いは無機粘結剤に界面活性剤を添加したものを用いて行
ない、含浸時間により含浸層の厚さを調整することかで
きる。In any of the above methods, the thickness of the layer impregnated with the inorganic binder is determined by impregnating the inorganic binder under reduced pressure in a vacuum,
The thickness of the impregnated layer can be adjusted by adjusting the pressure and impregnation time, or by using an inorganic binder with a surfactant added, and the thickness of the impregnated layer can be adjusted by adjusting the impregnation time.
まず、本発明の鋳型造型法について概説すると、シェル
モールド法、コールドボックス法、フラン法等、従来公
知の造型法により鋳物砂と有機質粘結剤（バインダー）
を混練し、鋳型造型を行なう。次いで、無機粘結剤を含
浸させ、乾燥後、大気中高温下で有機物を燃焼させ、無
機粘結剤で鋳型形状を保持させる。すなわち、「従来造
型法による鋳型造型」＝「無機粘結剤含浸」−「乾燥」
−「焼成」という工程から成る。無機粘結剤の含浸層の
厚さは、前記したように減圧含浸の圧力と時間、又は、
浸透剤（界面活性剤）添加により制御できる。First, to outline the mold making method of the present invention, molding sand and an organic binder (binder) are formed using conventionally known molding methods such as the shell mold method, cold box method, and furan method.
Knead and make a mold. Next, the mold is impregnated with an inorganic binder, and after drying, the organic substance is burned in the atmosphere at high temperature, and the mold shape is maintained by the inorganic binder. In other words, "mold molding by conventional molding method" = "impregnation with inorganic binder" - "drying"
- Consists of a process called "firing". The thickness of the inorganic binder impregnated layer depends on the pressure and time of vacuum impregnation as described above, or
It can be controlled by adding a penetrant (surfactant).
本発明の第一発明によれば、含浸させる無機粘結剤とし
て、Ｓ ｉ ０２ ／Ｎａ２０モル比が４．５〜６．０
の無機粘結剤を用いることを特徴としている。本発明者
の研究によれば、用いる無機粘結剤のＳｉＯ２／Ｎａ２
Ｏモル比が４．５〜６，０の範囲に設定されれば、常温
において３０〜１１００）ｃｄｃ−程度の抗折力が得ら
れ、しかも砂落ち性にも優れることが見い出された。従
来用いられているコロイダルシリカ（商品名スノーテッ
クスとして市販されている）は強い浸透性を持ち、乾燥
するとゲル化して無機高分子系粘結剤として働くが、Ｓ
ｉ ０２含有率が極めて高いため、これによって鋳型
形状を保持しようとしても、前記したように常温におけ
る抗折力が極めて低く、鋳型として用いることができな
い。一方、水ガラス（Ｓｉ０２／Ｎａ２０モル比約４．
３）やケイ酸ソーダ（約２．４〜３．３）を用いた場合
、抗折力が高くなり過ぎ、崩壊性の点て問題がある。本
発明の第一発明は、無機粘結剤のＳｉＯ２／Ｎａ２Ｏモ
ル比を４．５〜６．０の範囲に設定することにより、常
温下での抗折力及び砂落ち性の両方を満足させたもので
ある。According to the first aspect of the present invention, the inorganic binder to be impregnated has a Si02/Na20 molar ratio of 4.5 to 6.0.
It is characterized by using an inorganic binder. According to the research of the present inventor, the inorganic binder used is SiO2/Na2
It has been found that when the O molar ratio is set in the range of 4.5 to 6.0, a transverse rupture strength of about 30 to 1100)cdc- can be obtained at room temperature, and the sand removal properties are also excellent. The conventionally used colloidal silica (commercially available under the trade name Snowtex) has strong permeability, turns into a gel when dried, and works as an inorganic polymer binder, but S
Since the i02 content is extremely high, even if an attempt is made to maintain the shape of the mold, the transverse rupture strength at room temperature is extremely low, as described above, and it cannot be used as a mold. On the other hand, water glass (Si02/Na20 molar ratio of about 4.
3) or sodium silicate (approximately 2.4 to 3.3), the transverse rupture strength becomes too high and there is a problem in terms of disintegration. The first invention of the present invention satisfies both the transverse rupture strength and the sand removal property at room temperature by setting the SiO2/Na2O molar ratio of the inorganic binder in the range of 4.5 to 6.0. It is something that
このような特定のＳｉＯ２／Ｎａ２Ｏモル比の無機粘結
剤は、コロイダルシリカに不純物を添加したり、あるい
は水ガラスにコロイダルシリカを添加したりする方法に
よって容易に製造することができる。なお、本発明の第
一発明による鋳型造型法においては、無機粘結剤含浸後
の乾燥は、前記したように自然乾燥（放置乾燥）、５０
〜１５０℃での低温乾燥又は減圧マイクロ波乾燥のいず
れの方法でもよい。Such an inorganic binder having a specific SiO2/Na2O molar ratio can be easily produced by adding impurities to colloidal silica or adding colloidal silica to water glass. In addition, in the mold making method according to the first invention of the present invention, drying after impregnation with an inorganic binder is performed by natural drying (standing drying), 50%
Either low-temperature drying at ~150° C. or reduced-pressure microwave drying may be used.
本発明の第二発明による鋳型造型法においては、無機粘
結剤含浸後の乾燥を減圧マイクロ波乾燥により行なうも
のであり、この場合、無機粘結剤としては上記特定のＳ
ｉＯ２／Ｎａ２Ｏモル比の無機粘結剤の他、コロイダル
シリカなど他の無機粘結剤も用いることができる。すな
わち、無機粘結剤含浸後に減圧マイクロ波乾燥を行なう
ことにより、含浸した無機粘結剤か表面層近くに滲み出
し、水分のみが飛んでしまい、表面近くに粘結剤が多く
析出するため、焼成後に表面強度が高くなると共に、中
央部は結合力が小さくなるため、砂落ち性も良い。また
、水溶液系の無機粘結剤は減圧により沸点が低くなるた
め、短時間の処理で充分であるという利点も得られる。In the mold making method according to the second aspect of the present invention, drying after impregnation with an inorganic binder is performed by vacuum drying using microwave drying, and in this case, the above-mentioned specific S
In addition to the iO2/Na2O molar ratio inorganic binder, other inorganic binders such as colloidal silica can also be used. In other words, when vacuum drying is performed after impregnation with an inorganic binder, the impregnated inorganic binder oozes out near the surface layer, and only moisture evaporates, causing a large amount of the binder to precipitate near the surface. After firing, the surface strength increases and the bonding force in the center area decreases, resulting in good sand removal properties. Furthermore, since the boiling point of an aqueous inorganic binder is lowered by reducing the pressure, there is an advantage that a short treatment time is sufficient.
また、減圧マイクロ波乾燥を行なうので、高温乾燥の場
合の泡が生成して表面かあばた状になるというようなこ
ともない。In addition, since vacuum drying is performed under reduced pressure, there is no possibility that bubbles would form on the surface and cause pock marks during high-temperature drying.
なお、無機粘結剤としてコロイダルシリカを用いる場合
には、前記したように常温において鋳型の強度が出にく
いので、乾燥後の焼成は前記特殊無機粘結剤を用いる場
合に比べて高温で行なうことが望ましい。In addition, when using colloidal silica as an inorganic binder, as mentioned above, the strength of the mold is difficult to obtain at room temperature, so the firing after drying should be performed at a higher temperature than when using the special inorganic binder. is desirable.
以下、実施例を示して本発明について具体的に説明する
が、本発明か下記実施例により限定されるものでないこ
とはもとよりである。The present invention will be specifically described below with reference to Examples, but it goes without saying that the present invention is not limited to the Examples below.
実施例１
耐火物ムライトを使用し、シェルモールド法によりφ５
０ Ｘ ５０ ’ ｉｎの試験片を製作し、また鋳型強
度を試験するために併せて抗折試験片１１０Ｘ１０Ｘ６
０＋ｗの試験片を製作し、表−１に示す各種無機粘結剤
を含浸させ、２５〜３０℃で２４時間放置して乾燥させ
、次いで大気中１０００℃×１時間で焼成し、第１図に
示す方法にて鋳鋼の注入（１５８０℃注入）を行なった
。すなわち、第１図に示すように型１の底部に試験片２
（φ５０Ｘ５０’）を４個セットし、湯道３から注入す
ることにより、焼付テストを行なった。また、砂落ち性
を見るために、第２図に示すように、試験片２から約１
２０１１１１Ｍ間して配置されたノズル４がら空気圧４
ｋｇ ／ ｃｄで吹き付けてサンドブラスト処理する
方法により、砂が落ちる状況を調べた結果、Ｓ ｉ ０
２ ／Ｎａ２０モル比４．９の特殊無機粘結剤（Ｎ ｏ
。Example 1 Using refractory mullite, φ5 by shell molding method
A 0 x 50' inch test piece was prepared, and a bending test piece of 110 x 10 x 6 was also prepared to test the mold strength.
A 0+W test piece was prepared, impregnated with various inorganic binders shown in Table 1, left to dry at 25 to 30°C for 24 hours, and then fired in the air at 1000°C for 1 hour. Cast steel was poured (injected at 1580° C.) using the method shown below. That is, as shown in FIG.
A seizure test was conducted by setting four pieces of (φ50×50′) and injecting them from runner 3. In addition, in order to check the sand removal property, as shown in Figure 2, about 1
Air pressure 4 from nozzle 4 arranged between 201111M
As a result of investigating the situation in which sand falls using the method of sandblasting by spraying at kg/cd, S i 0
2/Na20 molar ratio of 4.9 (N o
.
４）を用いた場合には焼付きもなく、３分のサンドブラ
スト処理で砂は落ちたが、他の無機粘結剤を用いた場合
には焼付きを生じ、砂をこさぎ落すことも困難であった
。１０Ｘ１０Ｘ６０龍の試験片について抗折力を測定し
た結果を表−１に併せて示す。When using 4), there was no seizure and the sand came off after 3 minutes of sandblasting, but when other inorganic binders were used, seizure occurred and it was difficult to scrape off the sand. Met. Table 1 also shows the results of measuring the transverse rupture strength of the 10X10X60 dragon test piece.
表−１
＄１）１０Ｘ１０Ｘ６０ｍ■試験片を１０００”ＣＸ１
時間焼成後の強度
＊２）特開平１−１４８４３８号表１の冷却時の強度に
相当
実施例２
耐火物ムライトを使用し、実施例１と同条件にて試験片
を製作し、コロイダルシリカを含浸させた。試験片の乾
燥方法としては、自然乾燥４８時間と減圧マイクロ波乾
燥をそれぞれ行ない、その後、大気中１５００℃×１時
間で焼成し、実施例１と同様にして鋳鋼を注入し、砂落
ち性を調べた結果、自然乾燥を４８時間行なった場合に
は焼結し、砂は落ちなかったのに対して、減圧マイクロ
波乾燥を行なった場合には、５分のサンドブラスト処理
で内部の砂が落ち、さらに５分処理した結果、表面の砂
も落とすことができた。これは、減圧マイクロ波乾燥で
は含浸した無機粘結剤（コロイダルシリカ）が表面にし
み出し、水分のみが飛んでしまい、表面付近に粘結剤が
多く析出して表面強度は充分となるが、中央部は結合力
か小さくなり、その結果砂落ち性が良くなったためであ
る。抗折力を測定した結果を表−２に示す。Table-1 $1) 10X10X60m■ Test piece 100”CX1
Strength after time firing *2) Corresponds to the strength after cooling in Table 1 of JP-A-1-148438 Example 2 Using refractory mullite, a test piece was produced under the same conditions as Example 1, and colloidal silica was used. Impregnated. The test pieces were dried by natural drying for 48 hours and by vacuum microwave drying, and then fired in the atmosphere at 1500°C for 1 hour. Cast steel was injected in the same manner as in Example 1 to improve sand removal properties. As a result of the investigation, when air drying was performed for 48 hours, sintering occurred and the sand did not fall off, whereas when low-pressure microwave drying was performed, the sand inside fell off after 5 minutes of sandblasting. As a result of processing for an additional 5 minutes, the sand on the surface was also able to be removed. This is because in vacuum microwave drying, the impregnated inorganic binder (colloidal silica) oozes out to the surface, and only water is blown away, and a large amount of binder precipitates near the surface, resulting in sufficient surface strength. This is because the bonding force in the central part was reduced, and as a result, sand removal properties were improved. Table 2 shows the results of transverse rupture strength measurements.
表−２
＊）１０Ｘ１０Ｘ６０ｍｍ試験片を１５００℃×１時間
焼成後の強度
〔発明の効果〕
以上のように、本発明の鋳型造型法は、鋳型造型−無機
粘結剤含浸一乾燥一焼成という一連の工程からなる鋳型
造型法において、無機粘結剤としてＳｉＯ２／Ｎａ２Ｏ
モル比が４，５〜６．０の無機粘結剤を用いるか、ある
いは上記乾燥を減圧マイクロ波乾燥により行なうもので
あるため、得られる鋳型は常温において充分な強度を有
すると共に、焼付きもなく、溶湯注入後の砂落ち性も良
い。また、有機系バインダー使用におけるような鋳型か
らのガス発生も少なく、上記一連の工程により生産性よ
く鋳型造型を行なうことができ、さらに減圧マイクロ波
乾燥を行なうことにより乾燥時間を短縮することもでき
る。Table 2 *) Strength after firing a 10 x 10 x 60 mm test piece at 1500°C for 1 hour [Effects of the invention] As described above, the mold making method of the present invention is a series of mold making - inorganic binder impregnation - drying - firing. In the mold making method consisting of the steps of
Since an inorganic binder with a molar ratio of 4.5 to 6.0 is used or the drying is performed by vacuum microwave drying, the resulting mold has sufficient strength at room temperature and is free from seizure. It also has good sand removal properties after pouring molten metal. In addition, there is less gas generation from the mold, unlike when organic binders are used, and the above series of steps allows for highly productive mold making.In addition, drying time can be shortened by using vacuum microwave drying. .
第１図は実施例において行なった焼付テストの注入方式
を示す概略説明図であり、第１図（Ａ）は焼付テスト装
置の平面図、第１図（Ｂ）はその縦断面図、第２図は砂
落ち評価の試験方法を示す概略説明図である。
第
１
図
（Ａ）
第
図
３・満１
手続補正書（自発）
平成２年６月１１日FIG. 1 is a schematic explanatory diagram showing the injection method for the seizure test conducted in the example, and FIG. 1(A) is a plan view of the seizure test device, FIG. The figure is a schematic explanatory diagram showing a test method for sand drop evaluation. Figure 1 (A) Figure 3, Part 1 Procedural amendment (voluntary) June 11, 1990
Claims (6)
ＳｉＯ＿２／Ｎａ＿２Ｏモル比が４．５〜６．０の無機
粘結剤を含浸させ、乾燥後、大気中高温下で有機物を燃
焼させ、無機粘結剤で鋳型形状を保持するようにしたこ
とを特徴とする鋳型造型法。(1) In a mold made by adding an organic binder to foundry sand,
It was impregnated with an inorganic binder with a SiO_2/Na_2O molar ratio of 4.5 to 6.0, and after drying, the organic matter was burned in the atmosphere at high temperature, and the mold shape was maintained with the inorganic binder. Characteristic mold making method.
ることを特徴とする請求項１記載の鋳型造型法。(2) The mold making method according to claim 1, wherein the inorganic binder is a water glass-based inorganic polymer binder.
燥により行なうことを特徴とする請求項１又は２記載の
鋳型造型法。(3) The mold making method according to claim 1 or 2, wherein the drying is carried out by natural drying, low temperature drying, or vacuum drying using microwaves.
機粘結剤を含浸させ、減圧マイクロ波乾燥を行なった後
、大気中高温下で有機物を燃焼させ、無機粘結剤で鋳型
形状を保持するようにしたことを特徴とする鋳型造型法
。(4) A mold made by adding an organic binder to foundry sand is impregnated with an inorganic binder, and after drying under reduced pressure microwaves, the organic matter is burned in the atmosphere at high temperature, and the inorganic binder is molded into a mold. A mold making method that is characterized by maintaining its shape.
含浸時間により含浸層の厚さを調整することを特徴とす
る請求項１乃至４のいずれかに記載の鋳型造型法。(5) The mold making method according to any one of claims 1 to 4, characterized in that the impregnation with the inorganic binder is carried out under vacuum and reduced pressure, and the thickness of the impregnated layer is adjusted by the pressure and impregnation time.
添加したものを用いて行ない、含浸時間により含浸層の
厚さを調整することを特徴とする請求項１乃至４のいず
れかに記載の鋳型造型法。(6) The impregnation of the inorganic binder is carried out using an inorganic binder to which a surfactant is added, and the thickness of the impregnated layer is adjusted by adjusting the impregnation time. The mold making method described in any of the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040953A JP2579825B2 (en) | 1990-02-23 | 1990-02-23 | Mold making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040953A JP2579825B2 (en) | 1990-02-23 | 1990-02-23 | Mold making method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03248740A true JPH03248740A (en) | 1991-11-06 |
| JP2579825B2 JP2579825B2 (en) | 1997-02-12 |
Family
ID=12594862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2040953A Expired - Lifetime JP2579825B2 (en) | 1990-02-23 | 1990-02-23 | Mold making method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2579825B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017536243A (en) * | 2015-01-20 | 2017-12-07 | ディーアール アクシオン カンパニー リミテッドＤｒ Ａｘｉｏｎ Ｃｏ．，Ｌｔｄ． | Manufacturing method of core and casting using inorganic binder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5131209A (en) * | 1974-09-10 | 1976-03-17 | Matsushita Electric Ind Co Ltd | JIKITEEPUHIKI DASHISOCHI |
| JPS52120225A (en) * | 1976-04-03 | 1977-10-08 | Nakata Giken Kk | Mold manufacturing |
| JPH01148438A (en) * | 1987-12-01 | 1989-06-09 | Mazda Motor Corp | Core for precision casting |
-
1990
- 1990-02-23 JP JP2040953A patent/JP2579825B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5131209A (en) * | 1974-09-10 | 1976-03-17 | Matsushita Electric Ind Co Ltd | JIKITEEPUHIKI DASHISOCHI |
| JPS52120225A (en) * | 1976-04-03 | 1977-10-08 | Nakata Giken Kk | Mold manufacturing |
| JPH01148438A (en) * | 1987-12-01 | 1989-06-09 | Mazda Motor Corp | Core for precision casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017536243A (en) * | 2015-01-20 | 2017-12-07 | ディーアール アクシオン カンパニー リミテッドＤｒ Ａｘｉｏｎ Ｃｏ．，Ｌｔｄ． | Manufacturing method of core and casting using inorganic binder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2579825B2 (en) | 1997-02-12 |
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