JPS63115649A - Molding method for hollow core - Google Patents
Molding method for hollow coreInfo
- Publication number
- JPS63115649A JPS63115649A JP26097186A JP26097186A JPS63115649A JP S63115649 A JPS63115649 A JP S63115649A JP 26097186 A JP26097186 A JP 26097186A JP 26097186 A JP26097186 A JP 26097186A JP S63115649 A JPS63115649 A JP S63115649A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- mixture
- core
- sand
- cavity
- 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 14
- 238000000465 moulding Methods 0.000 title claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000004576 sand Substances 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 10
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 2
- 239000003110 molding sand Substances 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 4
- 239000011347 resin Substances 0.000 abstract description 4
- 229920001187 thermosetting polymer Polymers 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005187 foaming Methods 0.000 abstract description 3
- 239000012258 stirred mixture Substances 0.000 abstract 3
- 239000012257 stirred material Substances 0.000 description 7
- 239000012190 activator Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 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
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 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） 本発明は内部に空胴を有する中子の造型方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for molding a core having a cavity inside.
（従来の技術）
シェルモールド法やコールドボックス法で中子を造型す
る場合、（１）造型時における硬化時間を短縮する、（
２）注湯時のガス発生量を少なくすると共にガス抜きを
容易にする、（３）型ばらし時の砂出しを容易にする、
（４）軽量化する、等の目的から中子の内部に空胴を設
けることが多い。(Prior art) When molding a core using the shell mold method or cold box method, (1) shortening the curing time during molding;
2) Reduces the amount of gas generated during pouring and facilitates degassing; (3) Easily removes sand when demolding.
(4) A cavity is often provided inside the core for the purpose of reducing weight.
中空中子の造型方法としては、シェル中子の場合は主と
して、反転排砂方式（加熱金型にシェル砂を吹込み充填
して所定時間経過後、該金型を反転して内部の未硬化砂
を排出するもの）が用いられ、コールドボックス中子及
び一部のシェル中子については、マンドレル方式（模型
箱又は金型内に中子の中空部に相当する芯部材 （マン
ドレ）Ｌ）を配置するもの）が用いられている。In the case of shell cores, the main method for molding hollow cores is the inversion sand evacuation method (shell sand is blown into a heated mold and filled, and after a predetermined period of time has elapsed, the mold is turned over to remove the unhardened interior of the mold). For cold box cores and some shell cores, a mandrel method (a core member (mandre) L corresponding to the hollow part of the core is placed inside a model box or mold) is used. ) are used.
（発明が解決しようとする問題点）
しかしこれらの方式は適用可能な中子の形状に制約があ
り、例えば第２図に示すような、（びれ部（Ｒ）を有す
る中子（Ｃ）や砂吹込孔部が極度に狭い中子等ｌこは適
用が困難である。その結果これらの中子（Ｃ）について
は内部に空胴が形成されず、注湯時に多量のガスが発生
する等、種々のトラブルが生じている。(Problems to be Solved by the Invention) However, these methods have restrictions on the shape of the core that can be applied.For example, as shown in FIG. It is difficult to apply this method to cores with extremely narrow sand blowing holes.As a result, no cavity is formed inside these cores (C), and a large amount of gas is generated during pouring. , various troubles have occurred.
本発明は上記のような事情に鑑みてなされたものであり
、どのような形状の中子でもその内部に空胴を形成でき
ろ方法を提供せんとするものである。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method by which a cavity can be formed inside a core of any shape.
（問題点を解決するための手段）
本発明は上記の目的を達成するため、鋳°物砂に界面活
性剤を添加し、金型内に充填した鋳物砂を該界面活性剤
の発泡作用により金型の壁面方向に押しつけ、以て中子
の内部に空胴を形成するようにしたものである。即ち本
発明は、珪砂と該珪砂の結合剤とから成る末硬化状態の
鋳物砂に界■活性剤の水溶液を添加して撹拌し、以て該
混合物を泡立てる工程と、該混合物を所定量加熱金型へ
注入する工程と、該注入物を前記加熱金型内に所定時間
保持する工程とから成っている。(Means for Solving the Problems) In order to achieve the above object, the present invention adds a surfactant to foundry sand, and uses the foaming action of the surfactant to fill the foundry sand in a mold. It is pressed against the wall of the mold to form a cavity inside the core. That is, the present invention includes a step of adding an aqueous solution of a surfactant to partially hardened foundry sand consisting of silica sand and a binder for the silica sand, stirring the mixture to foam the mixture, and heating the mixture by a predetermined amount. It consists of a step of injecting into a mold, and a step of holding the injected material in the heated mold for a predetermined period of time.
以下、本発明を実施例に基づき詳細に説明する。Hereinafter, the present invention will be explained in detail based on examples.
第１実施例
まず珪砂（フラタリーサンド）１００部と熱硬化性樹脂
（水溶性フェノール樹脂）３部を均一に混合する。次に
該混合物に界面活性剤（アルキルエーテル硫酸エステル
ナトリウム）の３％水溶液を５部添加し、十分泡立つま
で撹拌する。そして該撹拌物を２１０°Ｃに加熱された
金型のキャビティ内へ注入し、注入後直ちに注入口を閉
鎖する。なお該撹拌物の金型への注入量は、通常のシェ
ルモールド法におけるシェル砂の金型への充填量の約８
０％であることが造型後の中子重量を測定した結果分っ
た。First Example First, 100 parts of silica sand (flattery sand) and 3 parts of a thermosetting resin (water-soluble phenolic resin) are uniformly mixed. Next, 5 parts of a 3% aqueous solution of a surfactant (sodium alkyl ether sulfate) is added to the mixture, and the mixture is stirred until it becomes sufficiently foamy. The stirred material is then injected into the cavity of a mold heated to 210°C, and the injection port is immediately closed after the injection. The amount of the stirred material injected into the mold is about 8 times the amount of shell sand filled into the mold in the normal shell mold method.
As a result of measuring the weight of the core after molding, it was found that it was 0%.
前記撹拌物中の泡は金型内で加熱されて膨張し、その圧
力で珪砂と熱硬化性樹脂との混合物は金型のキャビテイ
壁面方向に押しつけられ、金型の熱により硬化する。そ
して前記撹拌物を金型内で１〜２分間焼成した後金型を
開（と、第１図に示す如（、表面側が緻密化すると共に
内部に空胴（Ｓ）を形成したシェル中子（Ｃ）が得られ
た。The bubbles in the stirred material are heated and expanded in the mold, and the pressure thereof forces the mixture of silica sand and thermosetting resin toward the cavity wall of the mold, whereupon it is hardened by the heat of the mold. After baking the stirred material in the mold for 1 to 2 minutes, the mold was opened (as shown in Fig. (C) was obtained.
第２実施例
まず珪砂（フラタリーサンド）１００部と水ガラス（Ｊ
Ｉ８２号）５部を均一に混合する。次に該混ｌに界面活
性剤（アルキルベンゼンスルフオン酸マグネシウム）の
１％水溶液を３部添加し、十分泡立つまで撹拌する。そ
して該撹拌物を１４０°Ｃに加熱した金型のキャビティ
内へ注入し、注入後直ちに注入口を閉鎖する。Second Example First, 100 parts of silica sand (flattery sand) and water glass (J
Mix 5 parts of No. I82) uniformly. Next, 3 parts of a 1% aqueous solution of a surfactant (magnesium alkylbenzenesulfonate) is added to the mixture, and the mixture is stirred until it becomes sufficiently foamy. The stirred material is then injected into the cavity of a mold heated to 140°C, and the injection port is immediately closed after the injection.
なお第２実施例における撹拌物の金型への注入量も、一
般の吹込み造型法における鋳物砂の模型箱又は金型への
充填量の約８０％であることが造型後の中子重量を測定
した結果分った。It should be noted that the amount of the agitated material injected into the mold in the second example is also about 80% of the amount of molding sand filled into the model box or mold in the general blow molding method, which is the weight of the core after molding. It was found as a result of measuring.
また前記金型には、キャビティ内で発生する蒸気を大気
へ放出するための通気孔が複数個設けられている。Further, the mold is provided with a plurality of vent holes for releasing steam generated within the cavity to the atmosphere.
前記撹拌物中の泡は金型内で加熱されて膨張し、その圧
力で珪砂と水ガラスとの混合物は金型のキャビテイ壁面
方向へ押しつけられ、金型の熱で含有水分が飛ばされる
ことにより硬化する。そして前記撹拌物を金型内に１〜
２分間保持した後金型を開くと、表面側が緻密化すると
共に内部が空胴化した中子が得られた。The bubbles in the stirred material are heated and expanded in the mold, and the pressure forces the mixture of silica sand and water glass toward the cavity wall of the mold, and the heat of the mold evaporates the water content. harden. Then, put the stirred material into the mold for 1~
When the mold was opened after holding for 2 minutes, a core was obtained whose surface side was densified and the inside was hollow.
（作用及び効果）
以上の説明から明らかなように、本発明は珪砂と該珪砂
の結合剤とから成る末硬化状態の鋳物砂に界面活性剤の
水溶液を添加して撹拌し、以て該混合物を泡立てる工程
と、該混合物を所定量加熱金型内へ注入する工程と、該
注入物を前記金型内に所定時間保持する工程とから成る
ものである。(Functions and Effects) As is clear from the above description, the present invention involves adding an aqueous solution of a surfactant to partially hardened foundry sand made of silica sand and a binder for the silica sand, and stirring the mixture. The process consists of a step of foaming the mixture, a step of injecting a predetermined amount of the mixture into a heating mold, and a step of holding the injected material in the mold for a predetermined period of time.
このような本発明によれば、金型内へ注入された混合物
中に含まれる泡は金型内で熱膨張し、その圧力で末硬化
状態の鋳物砂は金型キャビティの壁面方向に押しつけら
れる。このような状態で該鋳物砂を加熱硬化させること
により、表向が緻密化されると共に内部が空胴化された
中子を得ることができる。According to the present invention, the bubbles contained in the mixture injected into the mold undergo thermal expansion within the mold, and the resulting pressure forces the partially hardened molding sand toward the wall of the mold cavity. . By heating and hardening the foundry sand in such a state, a core whose surface is densified and whose interior is hollow can be obtained.
本発明は上記のようにして中子を造型するため、中子の
形状いかんに拘らず内部に空胴を形成することができ、
その結果として注湯時に多量のガスが発生する等のトラ
ブルを解消することができる。Since the present invention molds the core as described above, a cavity can be formed inside regardless of the shape of the core.
As a result, problems such as generation of a large amount of gas during pouring can be eliminated.
なお実施例では陰イオン活性剤を使用しているが、陽イ
オン活性剤（例えば第４アンモニウム塩）を使用しても
同様の効果が得られる。Although anionic activators are used in the examples, similar effects can be obtained by using cationic activators (for example, quaternary ammonium salts).
第１図は本発明方法によって造型したシェル中子の断面
図、第２図は従来方法によって造型した寥１図
〉２唱Figure 1 is a cross-sectional view of a shell core molded by the method of the present invention, and Figure 2 is a cross-sectional view of a shell core molded by the conventional method.
Claims (1)
界面活性剤の水溶液を添加して撹拌し、以て該混合物を
泡立てる工程と、該混合物を所定量加熱金型内へ注入す
る工程と、該注入物を前記加熱金型内に所定時間保持す
る工程とから成ることを特徴とする中空中子の造型方法
。A step of adding an aqueous solution of a surfactant to a partially hardened foundry sand consisting of silica sand and a binder for the silica sand and stirring the mixture to foam the mixture, and injecting a predetermined amount of the mixture into a heating mold. A method for molding a hollow core, comprising: a step of holding the injection material in the heating mold for a predetermined time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26097186A JPS63115649A (en) | 1986-10-31 | 1986-10-31 | Molding method for hollow core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26097186A JPS63115649A (en) | 1986-10-31 | 1986-10-31 | Molding method for hollow core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63115649A true JPS63115649A (en) | 1988-05-20 |
| JPH0532148B2 JPH0532148B2 (en) | 1993-05-14 |
Family
ID=17355294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26097186A Granted JPS63115649A (en) | 1986-10-31 | 1986-10-31 | Molding method for hollow core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63115649A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007058254A1 (en) | 2005-11-21 | 2007-05-24 | Sintokogio, Ltd. | Process for making molds |
| CN100333857C (en) * | 2005-11-29 | 2007-08-29 | 辽宁省轻工科学研究院 | Methd for preparing core of hollow ceramic |
| JP2011500330A (en) * | 2007-10-30 | 2011-01-06 | アッシュランド−ズードケミー−ケルンフェスト ゲゼルシャフト ミット ベシュレンクテル ハフツング | Molding material mixture with improved flowability |
| US8490677B2 (en) | 2003-09-02 | 2013-07-23 | Sintokogio, Ltd. | Method for forming molds and core for casting metal |
| WO2020246538A1 (en) * | 2019-06-07 | 2020-12-10 | 日油株式会社 | Surfactant composition for foaming sand |
-
1986
- 1986-10-31 JP JP26097186A patent/JPS63115649A/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8490677B2 (en) | 2003-09-02 | 2013-07-23 | Sintokogio, Ltd. | Method for forming molds and core for casting metal |
| US8528626B2 (en) | 2003-09-02 | 2013-09-10 | Sintokogio, Ltd. | Method for forming molds and a core for casting metal |
| WO2007058254A1 (en) | 2005-11-21 | 2007-05-24 | Sintokogio, Ltd. | Process for making molds |
| CN100333857C (en) * | 2005-11-29 | 2007-08-29 | 辽宁省轻工科学研究院 | Methd for preparing core of hollow ceramic |
| JP2011500330A (en) * | 2007-10-30 | 2011-01-06 | アッシュランド−ズードケミー−ケルンフェスト ゲゼルシャフト ミット ベシュレンクテル ハフツング | Molding material mixture with improved flowability |
| US10232430B2 (en) | 2007-10-30 | 2019-03-19 | Ask Chemicals Gmbh | Mould material mixture having improved flowability |
| WO2020246538A1 (en) * | 2019-06-07 | 2020-12-10 | 日油株式会社 | Surfactant composition for foaming sand |
| JPWO2020246538A1 (en) * | 2019-06-07 | 2020-12-10 | ||
| CN113905837A (en) * | 2019-06-07 | 2022-01-07 | 日油株式会社 | Surfactant composition for foamed sand |
| EP3981525A4 (en) * | 2019-06-07 | 2022-07-20 | NOF Corporation | Surfactant composition for foaming sand |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0532148B2 (en) | 1993-05-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |