JPS59159246A - Ceramic shell mold for casting - Google Patents
Ceramic shell mold for castingInfo
- Publication number
- JPS59159246A JPS59159246A JP3380583A JP3380583A JPS59159246A JP S59159246 A JPS59159246 A JP S59159246A JP 3380583 A JP3380583 A JP 3380583A JP 3380583 A JP3380583 A JP 3380583A JP S59159246 A JPS59159246 A JP S59159246A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- ceramic shell
- casting
- shell
- ceramic
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 30
- 238000005266 casting Methods 0.000 title abstract description 10
- 239000011819 refractory material Substances 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 7
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000005495 investment casting Methods 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- XMFOQHDPRMAJNU-UHFFFAOYSA-N lead(ii,iv) oxide Chemical compound O1[Pb]O[Pb]11O[Pb]O1 XMFOQHDPRMAJNU-UHFFFAOYSA-N 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 150000004712 monophosphates Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、造型および取扱いか容易なセラミックシェル
鋳型に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic shell mold that is easy to mold and handle.
鋳造用鋳型には、従来から多くの造型プロセスが用いら
力、ているが、その中でも特に美しい鋳肌が要求さね、
しかも高品質の鋳造品には、ショープロセス、ロストワ
ックス法等の精密鋳造鋳型が用いられている。Many molding processes have traditionally been used to create casting molds, but among them, beautiful casting surfaces are particularly required.
Moreover, precision casting molds such as the Shaw process and the lost wax method are used for high quality castings.
しかしながら、こバーらのプロセスは高温（ショープロ
セスで８００℃〜１２００℃）で焼成する必要があり、
又鋳型材料が高価である等の理由により、限られた範囲
にしか使用さねておらず、その大きさも約１０〜前後ま
でと限界があった。However, Kobar et al.'s process requires firing at high temperatures (800°C to 1200°C for the Shaw process);
Furthermore, due to the high cost of the mold material, it has only been used in a limited range, and its size has also been limited to about 10 mm.
本発明は、手軽に取扱いができ、しかも大型鋳造品にも
適用できるセラミックシェル鋳型を提供するものである
。The present invention provides a ceramic shell mold that is easy to handle and can be applied to large-sized castings.
すなわち本発明は、自硬性スラリー状耐火材を模型に塗
布し７．５〜１０ｔｔａｎ厚さの強固なセラミックシェ
ルを作った後、バックアップ鋳型を調製し、次いで前記
模型を除去してなるセラミックシェル鋳型に関するもの
である。That is, the present invention applies a self-hardening slurry refractory material to a model to create a strong ceramic shell with a thickness of 7.5 to 10 ttan, prepares a backup mold, and then removes the model to create a ceramic shell mold. It is related to.
本発明セラミック鋳型の特徴を列挙すれば次の通シであ
る。The characteristics of the ceramic mold of the present invention are listed as follows.
（イ） ５〜＋ｏｙＸ厚のセラミックシェルを表面層に
用い、バックアップに従来のプロセスを用いる。(a) A ceramic shell with a thickness of 5 to +oyX is used as the surface layer, and a conventional process is used for backup.
（ロ） セラミックシェルは高温焼成が不要で、１００
〜２００℃程度の乾燥のみで使用できる。(b) Ceramic shells do not require high-temperature firing;
It can be used only by drying at ~200°C.
（・→ 本発明セラミックシェル鋳型によれば、従来の
精密鋳造と同程度の高品質鋳造品が得らｊ７る。(・→ According to the ceramic shell mold of the present invention, a high-quality cast product comparable to that of conventional precision casting can be obtained.
←→ 本発明セラミックシェル鋳型は大型鋳造品に適用
できる。←→ The ceramic shell mold of the present invention can be applied to large-sized castings.
（ホ）本発明セラミックシェル鋳型は鋳鋼品、鋳鉄品、
他鋳造品全般に適用できる。(e) The ceramic shell mold of the present invention can be used for cast steel products, cast iron products,
Can be applied to all other cast products.
本発明セラミックシェル鋳型は第１図に示すように、士
ラミックシェル１、バックアップ鋳型２、鋳枠３から構
成される。As shown in FIG. 1, the ceramic shell mold of the present invention is composed of a ceramic shell 1, a backup mold 2, and a flask 3.
本発明セラミックシェル鋳型は次の手順により作成さ力
、る。まず離形剤を塗布した模型表面に、表ＩＫ示した
セラミック材料を表２に示した混合例でスラリー状にし
て５〜１０％厚さに塗布する。The ceramic shell mold of the present invention is made by the following procedure. First, on the surface of the model coated with a mold release agent, the ceramic materials shown in Table IK are made into a slurry using the mixing examples shown in Table 2 and applied to a thickness of 5 to 10%.
表 １
耐火物・・・金属の溶湯熱に耐え得る耐熱性又は熔融温
度を有する物、例えば黒鉛、シリカ、アルミナ、マグネ
シア、ジルコン、クロマイトなどの砂及び粉末を単−又
は二種以上混合しで使用する。Table 1 Refractories: Materials with heat resistance or melting temperature that can withstand the heat of molten metal, such as sand and powder of graphite, silica, alumina, magnesia, zircon, chromite, etc., singly or mixed together. use.
マグネシウム・・・ＭｙＯ分９０％以上の水酸化マグネ
シウム、電融マグネシアなどで、硬化水ｍｇに含まノす
る第１リン酸アルミニウムと混合することによりリン酸
マグネシウムを反応生成し硬化結合させる。Magnesium: Magnesium hydroxide, electrofused magnesia, etc. having a MyO content of 90% or more is mixed with primary aluminum phosphate contained in mg of hardening water to generate magnesium phosphate by reaction and harden and bond.
硬化促進剤・・・四三酸化鉛（ｐｂ３ｏ、）、四三酸イ
ヒ鉄（Ｆｅ３０４ ）などで、第１リン酸アルミニウム
と混合することによシ第１リン酸鉛、第１リン酸鉄など
を生成し硬化する。Hardening accelerator: Trilead tetroxide (PB3O,), triferric tetraoxide (Fe304), etc., which can be mixed with monobasic aluminum phosphate, lead monophosphate, monoferric phosphate, etc. is generated and hardened.
増粘剤・・・粘土類、澱粉類、及びポリビニールアルコ
ールなどで水と容易に溶解又は混合しスラリーに粘性を
与えると共に、低温乾燥で硬化作用を有するもの。Thickeners: Clays, starches, polyvinyl alcohol, etc. that easily dissolve or mix with water, give viscosity to the slurry, and have a hardening effect when dried at low temperatures.
第１リン酸アルミニウム水溶液・・・Ａｌ（Ｈ２ｐｏ４
）３２０〜７０％の水溶液で、粉体に含まれるマグネシ
ウム及び硬化促進剤と反応し２硬化結合する。Aluminum monophosphate aqueous solution...Al(H2po4
) A 320-70% aqueous solution reacts with the magnesium and hardening accelerator contained in the powder to form a 2-hardening bond.
シリカゾル水溶液・・・５ｉｎ２２０〜４０％の高分子
量無水シリカのコロイダル水溶液で加熱による脱水及び
溶湯熱によシ微靭Ｊシリカ粒子が結合し強固なバインダ
ーとなる。特に高温域において、安定した結合を示す。Aqueous silica sol solution: A 5 inch colloidal aqueous solution of 220-40% high molecular weight anhydrous silica, which is dehydrated by heating and bonded with fine J silica particles by the heat of the molten metal, forming a strong binder. Shows stable bonding, especially at high temperatures.
表 ２
塗布さハたセラミック材料は、第２図に示すように、模
型１１表面に接し７に側は微粒子１２が集１りなめらか
な肌となり、バ・ツクアップ側へ行くに従って粗粒子１
３となり、バックアップ側は凹凸のはげしい肌１４とな
る。このことにより鋳型の表面は美しくなり、バンクア
ンプｆｌｌ＋＋は第１図のバックアップ鋳型２と接着し
やすくなる。このセラミック材料１２〜１４＆−１数分
から数時間後に硬化し、強固な（高強度を有する）十ラ
ミックシェル１となる。Table 2 As shown in Fig. 2, the applied ceramic material has a smooth surface with fine particles 12 gathered on the side 7 in contact with the surface of the model 11, and coarse particles 1 as it goes toward the back-up side.
3, and the back-up side has a rough skin 14. This makes the surface of the mold beautiful and makes it easier for the bank amplifier fll++ to adhere to the backup mold 2 shown in FIG. This ceramic material 12 to 14&-1 hardens after several minutes to several hours, forming a strong (high strength) 10 ramic shell 1.
次に、すｊ枠６を十ッ卜し、バンクアップ鋳型２を充填
する。っこのバックアップ鋳型２Ｖ、１、従来からＪｔ
ｉいｒ、八でいる鋳型造型プロセスのフラン砂、水ガラ
ス糸砂、セメント系砂、■プロセス碧のうちいず汎を用
いても良い。バックアップ鋳型２Ｉ／て充分な強度が得
ら力たら、模型と、一体々なつ／ζセラミックシェル１
、およびバック−アップ鋳型２および鋳枠３とを分離す
る。Next, the frame 6 is filled with 100 ml of the bank-up mold 2. This backup mold 2V, 1, conventionally Jt
Any one of the following methods may be used: IR, furan sand, water glass fiber sand, cement-based sand, and 8 process molding processes. Backup mold 2I/Once it has sufficient strength, combine it with the model in one piece/ζ Ceramic shell 1
, and the backup mold 2 and flask 3 are separated.
しかる後、セラミックシェル１を１００〜２００Ｃの熱
風−Ｃ乾燥することにより、本発明上ラミックシェル鋳
型（づ完成する。Thereafter, the ceramic shell 1 is dried with hot air at 100 to 200 C to complete a ramic shell mold according to the present invention.
以トの本発明上ラミックシェル鋳型は、従来の砂型が鋳
肌や耐火性を改善するために表面に塗！、（１，ｊ ｌ
料を塗布するのに対して、バックアップ側に士ラミック
シェルを設けることにより改善を何すなものである。す
なわち従来の塗型では厚く塗６ ＋、’ｉｍけ限界があ
シ（最大１Ｘ程度）、又と′ｈ、１ソ、十に厚く塗ると
鋳型寸法に問題がおこる。The above inventive ramic shell molds are coated on the surface of conventional sand molds to improve casting surface and fire resistance! , (1,j l
What is an improvement by providing a ramic shell on the back-up side, compared to applying a coating material? In other words, with conventional coating molds, there is a limit to coating (maximum 1X), and if the coating is applied too thickly, problems will occur with the mold dimensions.
−方、不発明によれば、模型表面に塗型材料（→こラミ
ックシェル）を塗布するいわゆる逆塗型となるため、鋳
型の寸法精度を全くそこなゎ−ｆＫｓ〜１０％厚の強固
なセラミックシェルが得ら力、るのである。- On the other hand, according to the invention, since it is a so-called reverse coating mold in which the coating material (→coramic shell) is applied to the surface of the model, the dimensional accuracy of the mold is completely degraded. This is due to the ceramic shell.
本発明のセラミックシェルに用いる材料には次の条件が
必要である。The following conditions are required for the material used for the ceramic shell of the present invention.
（１）耐火性にすぐれていること。(1) It has excellent fire resistance.
（２） きわめて強固なシェルが得ら引−ること。(2) An extremely strong shell can be obtained.
（３） 一度に５〜１０Ｘ厚のセラミックシェルが得
らｉｌ、しかもダレが発生しないこと。(3) A ceramic shell with a thickness of 5 to 10X can be obtained at one time, and no sagging occurs.
（４） 自硬性であること。(4) It must be self-hardening.
（５）通気性を有し、ｆ００〜２０Ｃ１℃の低温乾燥で
も使用ｏｌ能であること。(5) It has air permeability and can be used even when drying at a low temperature of f00 to 20C1°C.
以上の条件を満たす材料は、現在使用さｔしているもの
の中から選びだすことはできず、本発明では、前記した
表１１表２の配合の材料を開発したものである。表１の
耐火物の粒度は、通気性を考慮し、粗粒（２咽〜０．０
７４ ｍｍ ）が７０〜９５係、細粒（０，０７４間以
下）が５〜３゜チの範囲で選定する０マグネシウムおよ
び硬化促進剤は、第１リン酸アルミニウムと反応し、耐
火物の粒子を結合硬化させる。増粘剤は所定の厚み（５
％〜１０Ｘ）が得られかつダレが発生しない様に粘性を
調整すると共に熱硬化性を有している。第１リン酸アル
ミニウム水溶液は常温に於いてマグネシウムおよび硬化
促進剤と硬化反応すると共に、セラミックシェルの低温
乾燥による水分の蒸発、脱水によシ耐人物粒子の結合を
よυ強くし、硬化を促進する。シリカゾル水溶液は、溶
湯熱及び溶湯圧に耐えるセラミックシエ／Ｌの高温強度
を発生させる。表２に示す粉末基材と水溶液の配合比は
、セラミツクンエルの厚さによって表２に示す範囲内で
選定する。セラミック材料のスラリー硬化時間の設定−
、マグネシウムと、第１リン酸アルミニウムとの比率と
配合量及び硬化促進剤の配合量の調整により行う。Materials satisfying the above conditions cannot be selected from those currently in use, and in the present invention, materials having the formulations shown in Table 11 and Table 2 described above have been developed. The particle size of the refractories in Table 1 is coarse (2-0.0 - 0.0
Magnesium and hardening accelerator selected in the range of 70 to 95 mm (74 mm) and 5 to 3 mm fine particles (0,074 mm or less) react with monoaluminum phosphate to form refractory particles. bond and harden. The thickener has a predetermined thickness (5
% to 10X), the viscosity is adjusted so as not to cause sag, and it has thermosetting properties. The monoaluminum phosphate aqueous solution undergoes a curing reaction with magnesium and the curing accelerator at room temperature, and also strengthens the bond between the anti-resistance particles through evaporation and dehydration due to low-temperature drying of the ceramic shell, promoting curing. do. The aqueous silica sol solution generates the high-temperature strength of Ceramic Sheer/L that can withstand the heat and pressure of the molten metal. The blending ratio of the powder base material and the aqueous solution shown in Table 2 is selected within the range shown in Table 2 depending on the thickness of the ceramic layer. Setting slurry curing time for ceramic materials
, by adjusting the ratio and blending amount of magnesium and monobasic aluminum phosphate, and the blending amount of the curing accelerator.
第１図は本発明セラミックシェル鋳型の構造を示す図、
第２図は本発明に係るセラミックシェル部の拡大模式図
である。
復代理人 内 １） 明
復代理人 萩 原 亮 、−FIG. 1 is a diagram showing the structure of the ceramic shell mold of the present invention;
FIG. 2 is an enlarged schematic diagram of a ceramic shell portion according to the present invention. Sub-agents 1) Meifuku agent Ryo Hagiwara, -
Claims (1)
Ｊｌさの強固なセラミックシェルを作った後、バックア
ップ鋳型を調製し、次いで前記模型を除去してなるセラ
ミックシェル鋳型。Apply a self-hardening slurry refractory material to the model to a thickness of 5 to 10 mm.
A ceramic shell mold is obtained by making a strong ceramic shell of Jl size, preparing a backup mold, and then removing the model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3380583A JPS59159246A (en) | 1983-03-03 | 1983-03-03 | Ceramic shell mold for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3380583A JPS59159246A (en) | 1983-03-03 | 1983-03-03 | Ceramic shell mold for casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59159246A true JPS59159246A (en) | 1984-09-08 |
Family
ID=12396690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3380583A Pending JPS59159246A (en) | 1983-03-03 | 1983-03-03 | Ceramic shell mold for casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59159246A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5212906A (en) * | 1988-02-10 | 1993-05-25 | Noboru Okuno | Liquid culture apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5131767A (en) * | 1974-09-11 | 1976-03-18 | Sekisui Plastics | HATSUHOSEISUCHIRENKEIJUGOTAIRYUSHI NO SEIZOHOHO |
| JPS5362731A (en) * | 1976-11-16 | 1978-06-05 | Kubota Ltd | Mold molding method |
-
1983
- 1983-03-03 JP JP3380583A patent/JPS59159246A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5131767A (en) * | 1974-09-11 | 1976-03-18 | Sekisui Plastics | HATSUHOSEISUCHIRENKEIJUGOTAIRYUSHI NO SEIZOHOHO |
| JPS5362731A (en) * | 1976-11-16 | 1978-06-05 | Kubota Ltd | Mold molding method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5212906A (en) * | 1988-02-10 | 1993-05-25 | Noboru Okuno | Liquid culture apparatus |
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