JPH037486B2 - - Google Patents
Info
- Publication number
- JPH037486B2 JPH037486B2 JP2432385A JP2432385A JPH037486B2 JP H037486 B2 JPH037486 B2 JP H037486B2 JP 2432385 A JP2432385 A JP 2432385A JP 2432385 A JP2432385 A JP 2432385A JP H037486 B2 JPH037486 B2 JP H037486B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- slip
- solvent
- resin
- green body
- 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
- 229920005989 resin Polymers 0.000 claims description 40
- 239000011347 resin Substances 0.000 claims description 40
- 239000011230 binding agent Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 239000012046 mixed solvent Substances 0.000 claims description 15
- 239000003960 organic solvent Substances 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 238000007569 slipcasting Methods 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Natural products CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 20
- 239000002904 solvent Substances 0.000 description 18
- 239000002609 medium Substances 0.000 description 14
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 235000019441 ethanol Nutrition 0.000 description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000020 Nitrocellulose Substances 0.000 description 6
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 6
- 229920001220 nitrocellulos Polymers 0.000 description 6
- 229920002689 polyvinyl acetate Polymers 0.000 description 6
- 239000011118 polyvinyl acetate Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000004793 Polystyrene Substances 0.000 description 5
- 229920002223 polystyrene Polymers 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 239000003085 diluting agent Substances 0.000 description 4
- 239000000113 methacrylic resin Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011505 plaster Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 229920001893 acrylonitrile styrene Polymers 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229920002301 cellulose acetate Polymers 0.000 description 3
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- UOCLXMDMGBRAIB-UHFFFAOYSA-N 1,1,1-trichloroethane Chemical compound CC(Cl)(Cl)Cl UOCLXMDMGBRAIB-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000005909 ethyl alcohol group Chemical group 0.000 description 2
- 229920000554 ionomer Polymers 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 239000011800 void material Substances 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)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は例えばセラミツク粒、金属粒などの粒
子のスリツプ（泥しよう）を鋳込んで成形品を造
るスリツプキヤステイング成形法および成形用鋳
型に係り、特に複雑形状の成形品を造るに好適な
成形法および成形用鋳型に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a slip casting molding method in which a molded product is made by casting a slip of particles such as ceramic grains or metal grains, and a mold for molding. In particular, the present invention relates to a molding method and mold suitable for producing molded products with complex shapes.
セラミツクスのスリツプキヤステイングに用い
る鋳型は、通常、割り型とし更に抜き勾配をつけ
ることによつて、スリツプ鋳込後の鋳型を固定後
のスリツプ成形体（以下「グリーンボデイ」と称
す）から分離する。このグリーンボデイを高温で
焼結することにより完成セラミツクス品を得る。
The mold used for slip casting of ceramics is usually a split mold and a draft angle is added to separate the mold after slip casting from the fixed slip molded body (hereinafter referred to as "green body"). . A finished ceramic product is obtained by sintering this green body at high temperature.
外観形状および空洞部の形状が複雑で寸法精度
の高い成形体をスリツプキヤステイングで成形す
る場合には、鋳型、特に中子の形状が複雑になる
ため、こるをグリーンボデイから除くことは容易
ではなく、場合によつては不可能である。 When using slip casting to mold a molded product with a complex external shape and cavity shape and high dimensional accuracy, the shape of the mold, especially the core, becomes complex, so it is not easy to remove this from the green body. In some cases, it is not possible.
すなわち、鋳型を除く前におけるグリーンボデ
イの脱湿過程および主型、中子の取外し過程でグ
リーンボデイに割れが発生しやすい。また、中子
の形状が、固定後のグリーンボデイから引抜くこ
とのできる場合しか適用できない。 That is, cracks are likely to occur in the green body during the process of dehumidifying the green body before removing the mold and during the process of removing the main mold and core. Furthermore, this method is applicable only when the shape of the core allows it to be pulled out from the green body after fixation.
そこで、このような場合にスリツプ鋳込後の鋳
型を除去する方法として、例えば特公昭58―
125658号公報に開示されているように鋳型を組込
んだまま焼結し、その後、鋳型に外力を加え崩壊
除去する方法がある。しかし、この方法は鋳型を
組込んだまま大気中放置などによりグリーンボデ
イを乾燥するため、また鋳型を組込んだまま焼結
するため、形状が複雑なものでは乾燥時および焼
結時に生ずる鋳型およびグリーンボデイの収縮・
変形により成形品に割れが生じる場合がある。ま
た、この引例はさの構成から判断すると、中子の
使用を想定していないと考えられる。 Therefore, as a method for removing the mold after slip casting in such cases, for example,
As disclosed in Japanese Patent No. 125658, there is a method in which the mold is sintered with the mold installed, and then an external force is applied to the mold to cause it to collapse and be removed. However, with this method, the green body is dried by leaving it in the air with the mold installed, and the green body is sintered with the mold installed, so if the shape is complex, mold and Green body contraction/
Cracks may occur in the molded product due to deformation. Also, judging from the structure of the shell, this reference does not assume the use of a core.
一方、特開昭57―176107号公報に開示されるよ
うに温水崩壊性石膏鋳型にスリツプを流し込み、
スリツプが固化しグリーンボデイとなつたのち、
（グリーンボデイ＋鋳型）を約85℃以上の温水に
浸漬して石膏鋳型を除去する方法がある。 On the other hand, as disclosed in JP-A-57-176107, a slip is poured into a hot water-disintegrable plaster mold,
After the slip hardens and becomes a green body,
There is a method to remove the plaster mold by immersing the (green body + mold) in warm water of about 85℃ or higher.
しかし、この方法は浸漬中にグリーンボデイが
吸水により崩壊することを防ぐために、およそ
0.1〜５％の粘結剤をスリツプ中に添加しており、
粘結剤の量によつては焼結品の機械的性質に影響
を与える場合がある。また、鋳型の奥部まで温水
で崩壊させるには長時間を要する場合がある。す
なわち、細長い中子を熱水崩壊性鋳型でつくり周
囲にスリツプを鋳込んだ場合、中子の全表面積に
占める温水接触面積の割合は鋳型の除去時間に反
比例する。 However, in this method, in order to prevent the green body from disintegrating due to water absorption during soaking, approximately
0.1 to 5% binder is added to the slip.
The amount of binder may affect the mechanical properties of the sintered product. Furthermore, it may take a long time to disintegrate the deep part of the mold with hot water. That is, when an elongated core is made with a hot water disintegrable mold and a slip is cast around it, the proportion of the hot water contact area to the total surface area of the core is inversely proportional to the mold removal time.
本発明は上記に鑑み、スリツプの固化直後に鋳
型の除去を可能とすることにより、成形品の割れ
防止を実現すると共に複雑形状品の成形に好適な
スリツプキヤステイング成形法および成形用鋳型
を提供することを目的とする。
In view of the above, the present invention provides a slip casting molding method and a mold that are suitable for molding complex-shaped products and prevent cracking of molded products by making it possible to remove the mold immediately after solidification of the slip. The purpose is to
本発明は鋳型内に有機溶剤を媒液としたスリツ
プを鋳込み、スリツプの固化後に鋳型を除去する
成形法において、前記鋳型をスリツプの媒液とし
ての溶剤に可溶性の粘結剤と骨材の混合物で造型
することを特徴とするものである。
The present invention is a molding method in which a slip with an organic solvent as a medium is cast into a mold and the mold is removed after the slip has solidified. It is characterized by being molded with.
この場合の鋳型骨材にはアルミナ（Al2O3）、
マグネシヤ（MgO）、ジルコンサンド、珪砂など
使用するスリツプの媒液に不溶性もしくは難溶性
の粉粒体であつて適度の粒度のものであれば良
く、樹脂粒子であつても良い。また溶剤可溶性の
粘結材としては有機樹脂を混合溶剤に溶解させた
ものを用いる。 In this case, the mold aggregate is alumina (Al 2 O 3 ),
Any powder or granular material that is insoluble or poorly soluble in the slip medium used, such as magnesia (MgO), zircon sand, or silica sand, and has an appropriate particle size may be used, and resin particles may also be used. Further, as the solvent-soluble binding material, one in which an organic resin is dissolved in a mixed solvent is used.
この場合の有機樹脂とは、スリツプの媒液とし
ての有機溶剤に可溶性のものを選ぶ必要がある。 In this case, the organic resin must be one that is soluble in the organic solvent used as the slip medium.
すなわちスリツプの媒液としての有機溶剤がア
セトンの場合、有機樹脂はアクリロニトリルース
チレンコポリマー、ABS樹脂、メタクリル樹脂、
ポリ酢酸ビニル、酢酸ビニル、酢酸セルローズ系
樹脂、硝酸セルロース系樹脂、酢酸酪酸セルロー
ス系樹脂、ポリ塩化ビニル樹脂、ポリスチレン樹
脂などアセトンに可溶性の樹脂であれば、いずれ
でも良い。 In other words, when the organic solvent used as the slip medium is acetone, the organic resin is acrylonitrile-styrene copolymer, ABS resin, methacrylic resin,
Any resin that is soluble in acetone may be used, such as polyvinyl acetate, vinyl acetate, cellulose acetate resin, cellulose nitrate resin, cellulose acetate butyrate resin, polyvinyl chloride resin, and polystyrene resin.
媒液としての有機溶剤がエチルアルコールの場
合、有機樹脂はアクリロニトリル−スチレンコポ
リマー、メタクリル樹脂、ポリ酢酸ビニル、酢酸
セルロース系樹脂、硝酸セルロース系樹脂、酢酸
酪酸セルロース系樹脂、ポリスチレン樹脂などエ
チルアルコールに可溶性の樹脂であれば、いずれ
でも良い。 When the organic solvent used as a medium is ethyl alcohol, the organic resin is soluble in ethyl alcohol, such as acrylonitrile-styrene copolymer, methacrylic resin, polyvinyl acetate, cellulose acetate resin, cellulose nitrate resin, cellulose acetate butyrate resin, polystyrene resin, etc. Any resin may be used as long as it is a resin.
媒液としての有機溶剤がメチルアルコールの場
合、有機樹脂はポリ酢酸ビニル、メタクリル樹
脂、酢酸セルロース系樹脂、硝酸セルロース系樹
脂、酢酸酪酸セルロース系樹脂、アイオノマーな
どメチルアルコールに可溶性の樹脂であれば、い
ずれでも良い。 When the organic solvent as a medium is methyl alcohol, the organic resin may be a resin soluble in methyl alcohol such as polyvinyl acetate, methacrylic resin, cellulose acetate resin, cellulose nitrate resin, cellulose acetate butyrate resin, ionomer, etc. Either is fine.
媒液としての有機溶剤がトルエンの場合、有機
樹脂は、アクリロニトリルースチレンコポリマ
ー、ABS樹脂、メタクリル樹脂、ポリ酢酸ビニ
ル、ポリカーボネート、硝酸セルロース系樹脂、
ポリ塩化ビニル樹脂、エチレン―酢酸ビニルコポ
リマー、アイオノマー、ポリプロピレン、ポリブ
チレン、ポリスチレンなどトルエンに可溶性の樹
脂であれば、いずれでも良い。 When the organic solvent as a medium is toluene, the organic resin is acrylonitrile-styrene copolymer, ABS resin, methacrylic resin, polyvinyl acetate, polycarbonate, cellulose nitrate resin,
Any resin that is soluble in toluene may be used, such as polyvinyl chloride resin, ethylene-vinyl acetate copolymer, ionomer, polypropylene, polybutylene, and polystyrene.
粘結剤（有機樹脂＋混合溶剤）中の有機樹脂の
添加量は、多ければ鋳型強度が高くなり、鋳型の
表面安定性、鋳型の表面平滑度も向上し取扱いは
容易となる。しかしスリツプの媒液としての有機
溶剤を吸収して鋳型の粘結力を喪失させる本発明
においては、粘結剤の過剰添加は本質的に好まし
くない。また粘結剤中の混合溶剤の量は、鋳型作
成時の作業性に大きい影響を与える。すなわち、
骨材に対して混合溶剤の添加量が少なすぎると鋳
型材は粉粒体に近い状態にあり、多いとスリラー
状に近くなる。したがつて鋳型の作成方式を充墳
法によるか、流し込み法によるかに依つても異な
るが混合溶剤の添加量を選択すべきである。 The larger the amount of organic resin added in the binder (organic resin + mixed solvent), the higher the strength of the mold, the better the surface stability of the mold, the surface smoothness of the mold, and the easier handling. However, in the present invention, excessive addition of a binder is essentially undesirable since the mold loses its binding strength by absorbing the organic solvent as the slip medium. Furthermore, the amount of mixed solvent in the binder has a large effect on workability during mold making. That is,
If the amount of mixed solvent added to the aggregate is too small, the molding material will be in a state close to powder, and if it is too large, the mold material will be in a state close to that of a thriller. Therefore, the amount of mixed solvent to be added should be selected depending on whether the mold is made by the filling method or the pouring method.
以上のように、鋳型材を構成する各要素の配合
割合、すなわち鋳型骨材に対する粘結剤の添加
率、粘結剤中の有機樹脂と混合溶剤の比率など
は、骨材の材質や粒度分布、有機樹脂や混合溶剤
の種類、造ろうとする鋳型の形状・大きさ、鋳型
の作成方式などの諸条件によつて変動するので、
適正値は各々の場合について実験的に求める。概
略、骨材100重量部に対し、粘結剤中の有機樹
脂；５〜30重量部、混合溶剤；５〜30重量部に適
宜な量の稀釈液を加える。この場合の稀釈液は混
合溶剤と同じでも良いが、均一に混じりあい粘結
剤の特性に悪影響を与えないものであれば他でも
良い。たとえばメチルアルコールを混合溶剤とし
たポリ酢酸ビニル樹脂の場合、稀釈液はメチルア
ルコール、エチルアルコール、アセトン、酢酸エ
チルのいずれでも良い。 As mentioned above, the blending ratio of each element constituting the mold material, i.e. the addition rate of the binder to the mold aggregate, the ratio of organic resin and mixed solvent in the binder, etc. are determined by the material quality of the aggregate and the particle size distribution. It varies depending on various conditions such as the type of organic resin and mixed solvent, the shape and size of the mold to be made, and the method of making the mold.
Appropriate values are determined experimentally for each case. Roughly, an appropriate amount of diluent is added to 100 parts by weight of the aggregate, 5 to 30 parts by weight of the organic resin in the binder, 5 to 30 parts by weight of the mixed solvent. The diluent in this case may be the same as the mixed solvent, but may be any other diluent as long as it is uniformly mixed and does not adversely affect the properties of the binder. For example, in the case of polyvinyl acetate resin using methyl alcohol as a mixed solvent, the diluent may be methyl alcohol, ethyl alcohol, acetone, or ethyl acetate.
なお、薄肉の鋳型ではスリツプ中の溶剤のみで
鋳型を崩壊できるが、厚肉のもので崩壊に十分必
要な溶剤量をスリツプから得ることができないも
のでは(1)主型や中子の内部に空洞を設けることに
より鋳型を薄肉化することが望ましい。 Note that in the case of thin-walled molds, the mold can be collapsed using only the solvent in the slip, but in the case of thick-walled molds where it is not possible to obtain enough solvent from the slip for collapse, (1) the inside of the main mold or core may be destroyed; It is desirable to reduce the thickness of the mold by providing a cavity.
さらに、比較的厚肉の場合には、(2)外部より所
定量の溶剤を鋳型に噴霧等により添加し、もつて
崩壊性を助長させると、より効果的である。 Furthermore, in the case of relatively thick walls, it is more effective to (2) add a predetermined amount of solvent to the mold from the outside by spraying or the like to promote disintegration.
上記(1)、(2)の施策を併用すれば、鋳型崩壊の面
でより効果的である。 Combining measures (1) and (2) above will be more effective in preventing mold collapse.
本発明において、溶剤可溶性粘結剤で鋳型骨材
を固めて造型した鋳型にスリツプを鋳込み、鋳型
がスリツプ中の媒液である有機溶剤を吸収して崩
壊容易になる現象により複雑形状品の成形が可能
となる理由は次の通りである。 In the present invention, a slip is cast into a mold made by hardening the mold aggregate with a solvent-soluble binder, and the mold absorbs the organic solvent in the slip and easily disintegrates, thereby forming products with complex shapes. The reason why this is possible is as follows.
第１図ａ，ｂ，ｃに示すように、鋳型骨材粒子
１は未乾燥の状態では溶剤溶解性粘結剤２で被覆
されているが（９参照）、乾燥され硬化した鋳型
では混合溶剤は蒸発して内部に微細な空孔３が多
数形成され、このような鋳型にスリツプを鋳込む
とスリツプ中の溶剤は毛管現象で空孔３内に浸入
して溶剤溶解性粘結剤２の粘結力を喪失させ、
各々の耐火性粒子１を独立させる（ｅ参照）。 As shown in Figures 1a, b, and c, the mold aggregate particles 1 are coated with a solvent-soluble binder 2 in the wet state (see 9), but in the dried and hardened mold, the mold aggregate particles 1 are coated with a solvent-soluble binder 2. evaporates and many fine pores 3 are formed inside. When a slip is cast into such a mold, the solvent in the slip infiltrates into the pores 3 by capillary action and the solvent-soluble binder 2 is dissolved. Loss of cohesive strength,
Each refractory particle 1 is made independent (see e).
この結果、鋳型は強度の極めて低い除去容易な
状態となり、他方スリツプは媒液としての溶剤を
放出して固化してグリーンボデイとなる。 As a result, the mold has extremely low strength and is easily removed, while the slip releases the solvent as a medium and solidifies to form a green body.
したがつて成形品の形状が複雑なために鋳型も
凹凸が激しく複雑な形状の場合や、特に中子を用
いる場合でも奥部まで各部ほぼひとしく、スリツ
プから崩壊に必要な溶剤を吸収するので鋳型各部
は均等に崩壊可能となる。 Therefore, even when the shape of the molded product is complex and the mold has a highly uneven shape, or especially when a core is used, each part is almost the same all the way to the deep part, and the mold absorbs the solvent necessary for disintegration from the slip. Each part can be disintegrated equally.
鋳型の造形は骨材粒子と溶剤可溶性粘結材（有
機樹脂＋混合溶剤）の混練物をつき固めて行なわ
れるが、鋳型材料に流動性を付与すれば造形時間
を短縮できる。 The mold is formed by compacting a mixture of aggregate particles and a solvent-soluble binder (organic resin + mixed solvent), but the molding time can be shortened by imparting fluidity to the mold material.
流動性を付与するには、基本的には混合溶剤の
量を増加すれば良いが、混合溶剤がエチルアルコ
ールでない場合、たとえばアセトンやトルエンの
場合であつてもエチルアルコールを添加すれば良
い。 In order to impart fluidity, basically it is sufficient to increase the amount of the mixed solvent, but if the mixed solvent is not ethyl alcohol, for example, even if it is acetone or toluene, ethyl alcohol may be added.
アセトンやトルエンを増量しても流動性付与の
面からは良いが作業環境を考えた場合にはエチル
アルコールの方が望ましい。 Even if the amount of acetone or toluene is increased, it is good from the viewpoint of imparting fluidity, but when considering the working environment, ethyl alcohol is preferable.
以上のべたように鋳型はスリツプ中の溶剤を吸
収するに従い、スリツプとの界面より徐々に深部
まで崩壊可能な状態に移行するが、他方スリツプ
は溶剤を放出するに従い密度が上昇し、固化し、
遂にはグリーンボデイの生成に至る。 As mentioned above, as the mold absorbs the solvent in the slip, it gradually becomes collapsible from the interface with the slip to a deeper part, but on the other hand, as the slip releases the solvent, its density increases and it solidifies.
Finally, a green body is produced.
このグリーンボデイはその後の脱溶剤過程で収
縮する。反面、鋳型は僅かであるが膨潤する。通
常の石膏鋳型は、スリツプ中の溶剤を吸収しても
強度低下することはないので、グリーンボデイの
収縮、鋳型すなわち主型や中子の膨潤過程で発生
するストレスによりグリーンボデイに割れが発生
し易い。 This green body shrinks during the subsequent solvent removal process. On the other hand, the mold swells, albeit slightly. Ordinary plaster molds do not lose their strength even if they absorb the solvent in the slip, so cracks will occur in the green body due to stress generated during the shrinkage of the green body and the swelling process of the mold, that is, the main mold and core. easy.
しかるに本発明においては、グリーンボデイの
生成過程で発生する収縮・変形を主型や中子は阻
害することなく、溶剤の吸収に伴なつて、スリツ
プとの接触界面より鋳型内部に向つて遂次軟化す
る。このため、グリーンボデイには何らのストレ
スも発生せず、換言すればグリーンボデイは鋳型
（主型や中子）から何らの外力を受けることがな
いので、割れは全く発生しない。 However, in the present invention, the shrinkage and deformation that occur during the green body production process are not inhibited by the main mold or the core, and as the solvent is absorbed, the shrinkage and deformation that occur during the production process of the green body are sequentially carried out from the contact interface with the slip toward the inside of the mold. soften. Therefore, no stress is generated on the green body, in other words, the green body is not subjected to any external force from the mold (main mold or core), so no cracks occur at all.
一度軟化し崩壊容易となつた鋳型は、溶剤が揮
発しない限り再び硬化することはない。 Once softened and easily disintegrated, the mold will not harden again unless the solvent evaporates.
以上のべたように本発明においては鋳型の軟化
はスリツプの固化と同時に進行するから従来は極
めて困難であつた外観形状および空洞部の形状が
複雑な成形品、換言すると凹凸の激しく形状が複
雑な主型や中子を必要とする成形品に割れを発生
させることなく、極めて容易に成形できる。 As mentioned above, in the present invention, the softening of the mold progresses at the same time as the hardening of the slip, so it is possible to produce molded products with complicated external shapes and cavity shapes, which was extremely difficult in the past. It can be molded extremely easily without causing cracks in molded products that require a main mold or core.
以下に本発明の実施例について述べる。 Examples of the present invention will be described below.
実施例 １
アルミナ（250〜325メツシユ）；100重量部、濃
度30％の硝酸セルローズ樹脂（溶媒：アセト
ン）；15重量部、アセトン；15重量部を均一に混
合して鋳型材を調整した。次に別途準備した木型
により第２図に示す中子４を造形し、100℃で充
分乾燥硬化させたのち、別述造形し60℃で乾燥さ
せた石膏製の主型５，６と共に組立て、所定の鋳
型空洞を形成させた。Example 1 A mold material was prepared by uniformly mixing 100 parts by weight of alumina (250 to 325 mesh), 15 parts by weight of cellulose nitrate resin (solvent: acetone) at a concentration of 30%, and 15 parts by weight of acetone. Next, the core 4 shown in Fig. 2 is formed using a wooden mold prepared separately, and after sufficiently drying and hardening at 100°C, it is assembled together with the main molds 5 and 6 made of plaster, which were separately formed and dried at 60°C. , a predetermined mold cavity was formed.
これにエチルアルコールを媒液としたMgO微
粉のスリツプを鋳込んで１時間放置した。 A slip of MgO fine powder using ethyl alcohol as a medium was cast into this and left for one hour.
中子４の粘結剤中の有機樹脂である硝酸セルロ
ーズ樹脂は、媒液としてのエチルアルコールに溶
解し、鋳型は軟化するので中子４は容易に除去で
きると共に、グリーンボデイに割れの発生は全く
認められなかつた。 Cellulose nitrate resin, which is an organic resin in the binder of the core 4, dissolves in ethyl alcohol as a medium and softens the mold, making it easy to remove the core 4 and prevent the occurrence of cracks in the green body. It was not recognized at all.
実施例 ２
Al2O3（250〜325メツシユ）；100重量部にポリ
スチロールの20％トリエタン溶液50重量部を添加
し均一に混練して鋳型材を調整し、別述準備した
木型を用いて第２図における中子４および主型
５，６を造型し、その後70℃の熱風で乾燥硬化さ
せて実施例１と同様に組立てた。Example 2 Al 2 O 3 (250-325 mesh); 50 parts by weight of a 20% triethane solution of polystyrene was added to 100 parts by weight and mixed uniformly to prepare a mold material, and a wooden mold prepared separately was used. The core 4 and main molds 5 and 6 shown in FIG. 2 were molded using the same method, and then dried and hardened with hot air at 70° C., and assembled in the same manner as in Example 1.
SiC微粉；100重量部、無機炭素質添加剤（ガ
スブラツク）；３重量部及び高密化助剤（硼素含
有添加剤）１・５重量部を添加混合した。 100 parts by weight of SiC fine powder, 3 parts by weight of an inorganic carbonaceous additive (gas black), and 1.5 parts by weight of a densification aid (boron-containing additive) were added and mixed.
次にこの混合物を分散媒液である50重量部のア
セトン中に投入し、これに分散剤（モノエタノー
ルアミン）を前記混合物100重量部に対し２重量
部の割合に加えた。 Next, this mixture was poured into 50 parts by weight of acetone as a dispersion medium, and a dispersant (monoethanolamine) was added thereto at a ratio of 2 parts by weight per 100 parts by weight of the mixture.
そしてこの混合物を振動ミルにより均一の状態
に混合してSiCスリツプを作成し、前記鋳型中の
空洞に鋳込んで１時間放置した。 This mixture was mixed uniformly using a vibrating mill to prepare a SiC slip, which was then cast into the cavity of the mold and left for one hour.
鋳型の粘結剤中の有機樹脂であるポリスチロー
ル、は、媒液としてのアセトンに溶解し、鋳型は
粘結力を喪失して軟化したので中子４および主型
５，６は極めて容易に除去でき、割れのない良好
なグリーンボデイが得られた。 Polystyrene, an organic resin in the binder of the mold, was dissolved in acetone as a medium, and the mold lost its binding power and became soft, so the core 4 and main molds 5 and 6 could be easily formed. A good green body with no cracks was obtained.
実施例 ３
珪砂（250〜325メツシユ）；100重量部、メチレ
アルコールを溶媒とした濃度48％のポリ酢酸ビニ
ル樹脂；15重量部、エチルアルコール；15重量部
を均一に混合し実施例１に準じて中子４、および
主型５，６をつくり組立て所定の鋳型空洞を形成
させた。Example 3 Silica sand (250 to 325 mesh); 100 parts by weight, polyvinyl acetate resin with a concentration of 48% using methylene alcohol as a solvent; 15 parts by weight; and ethyl alcohol; 15 parts by weight were uniformly mixed and prepared according to Example 1. A core 4 and main molds 5 and 6 were made and assembled to form a predetermined mold cavity.
これに実施例１と同じセラミツクスリツプを鋳
込み１時間放置したところ中子４は、エチルアル
コールによつて粘結力を失ない極めて容易に除去
でき良好なグリーンボデイが得られた。 When the same ceramic slip as in Example 1 was cast into this and left for 1 hour, the core 4 did not lose its cohesive strength with ethyl alcohol and could be removed very easily, resulting in a good green body.
実施例 ４
実施例３と同じ鋳型の空洞に実施例２のスリツ
プを鋳込んで１時間放置したところ、中子４はス
リツプ中にアセトンによつて粘結力を失ない極め
て容易に除去でき良好なグリーンボデイが得られ
た。Example 4 When the slip of Example 2 was cast into the cavity of the same mold as in Example 3 and left for one hour, the core 4 did not lose its cohesive strength due to the acetone in the slip and could be removed very easily. A green body was obtained.
実施例 ５
第３図ａ，ｂにおいてｂで示すSiC焼結品９と
同一形状の樹脂模型を作り、この模型と別述準備
した枠とによつて鋳型１０および１１を造形し、
これをａのように組立てた。鋳型１０はAl2O3
（250〜320メツシユ）；100重量部、ポリスチロー
ルの20％トリエタン溶液；60重量部、エチルアル
コール；30重量部を混練して調整したスラリを注
入して造型し、その後乾燥したものである。Example 5 A resin model having the same shape as the SiC sintered product 9 shown by b in FIGS.
Assemble this as shown in a. Mold 10 is Al 2 O 3
(250-320 meshes): A slurry prepared by kneading 100 parts by weight, 60 parts by weight of a 20% polystyrene solution in triethane, and 30 parts by weight of ethyl alcohol was poured into a mold, and then dried.
空洞部１２に、実施例２に準じたSiCスリツプ
を鋳込んで１時間放置した。 A SiC slip according to Example 2 was cast into the cavity 12 and left for one hour.
鋳型の粘結剤中の有機樹脂であるポリスチロー
ルは媒液としてのアセトンに容易に溶解し、鋳型
は粘結力を喪失して軟化したので複雑形状の主型
１０，１１は容易に除去できた。 Polystyrene, an organic resin in the binder of the mold, was easily dissolved in acetone as a medium, and the mold lost its binding power and became soft, so the complex-shaped main molds 10 and 11 could be easily removed. Ta.
このグリーンボデイを所定の可熱条件で焼結す
ることにより、高密度で完全なSiC焼結品９が得
られた。 By sintering this green body under predetermined thermal conditions, a highly dense and complete SiC sintered product 9 was obtained.
実施例 ６
アルミナ（250〜325メツシユ）；100重量部、ア
クリル酸エステルの37％水溶液；20重量部、水；
20重量部を均一に混合して実施例５に準じて鋳型
１０，１１を造形し組立て、できた鋳型空洞に、
実施例２と同じSiCスリツプを鋳込み0.5時間放置
した。Example 6 Alumina (250-325 mesh); 100 parts by weight, 37% aqueous solution of acrylic ester; 20 parts by weight, water;
20 parts by weight were mixed uniformly, molds 10 and 11 were formed and assembled according to Example 5, and the resulting mold cavity was filled with:
The same SiC slip as in Example 2 was cast and left for 0.5 hour.
その結果、鋳型は粘結力を大幅に失ない、更に
崩壊を早めるために鋳型外部よりアセトンを噴霧
したところ実施例５と比べて短時間で割れのない
良好はグリーンボデイが得られた。 As a result, the mold did not significantly lose its cohesive strength, and when acetone was sprayed from the outside of the mold to accelerate disintegration, a good green body without cracking was obtained in a shorter time than in Example 5.
以上説明したように、本発明によれば溶剤溶解
性粘結剤を不溶性の粉粒体、たとえばAl2O3微粉
等に混ぜて鋳型を造型し、媒液として有機溶剤を
用いたスリツプを鋳込むので、鋳型は崩壊に必要
な有機溶剤をスリツプから吸収するにつれ徐々に
軟化し、遂に粘結力を喪失して崩壊容易となり、
他方溶剤放出によつて生成したグリーンボデイの
収縮・変形は、軟化した鋳型が吸収するようにし
たので、外観形状および空洞部の形状が複雑かつ
凹凸の激しい成形品を割れの発生がなく容易に得
ることができる。
As explained above, according to the present invention, a mold is formed by mixing a solvent-soluble binder with an insoluble powder such as Al 2 O 3 fine powder, and a slip using an organic solvent as a medium is cast. The mold gradually softens as it absorbs the organic solvent necessary for collapse from the slip, and eventually loses its cohesive strength and collapses easily.
On the other hand, the shrinkage and deformation of the green body caused by solvent release is absorbed by the softened mold, making it possible to easily produce molded products with complex external shapes and cavity shapes and severe irregularities without cracking. Obtainable.
第１図ａ，ｂ，ｃは本発明の成形に用いる鋳型
の原理を示す説明図、第２図は本発明成形法の実
施例の説明図、第３図は本発明成形法の他の実施
例の説明図である。
１……鋳型骨材粒子、２……溶剤溶解性粘結
剤、３……空孔、４……溶剤崩壊性中子、１０，
１１……溶剤崩壊性鋳型、５，６……鋳型、８…
…セラミツクスリツプ、９……セラミツクス焼結
品。
Figures 1 a, b, and c are explanatory diagrams showing the principle of the mold used for molding of the present invention, Figure 2 is an explanatory diagram of an embodiment of the molding method of the present invention, and Figure 3 is another embodiment of the molding method of the present invention. It is an explanatory diagram of an example. 1...Mold aggregate particles, 2...Solvent soluble binder, 3...Void, 4...Solvent disintegrable core, 10,
11... Solvent disintegrating mold, 5, 6... Mold, 8...
... Ceramic slip, 9... Ceramic sintered product.
Claims (1)
込み、スリツプの固化後に鋳型を除去する成形法
において、前記鋳型を前記有機溶剤に可溶性の粘
結剤を用いて造型し、該粘結剤は有機樹脂を混合
溶剤に溶解させたものであることを特徴とするス
リツプキヤステイング成形法。 ２ 鋳型骨材が有機溶剤に不溶性の粒子であるこ
とを特徴とする特許請求の範囲第１項記載のスリ
ツプキヤステイング成形法。 ３ スリツプの媒液である有機溶剤に可溶性の粘
結剤と、該有機溶剤に不溶性の骨材粒子とから造
型され、該粘結剤は有機樹脂を混合溶剤に溶解さ
せたものであることを特徴とするスリツプキヤス
テイング成形用鋳型。[Scope of Claims] 1. A molding method in which a slip using an organic solvent as a medium is cast into a mold and the mold is removed after solidification of the slip, wherein the mold is molded using a binder soluble in the organic solvent. . A slip casting molding method, characterized in that the binder is an organic resin dissolved in a mixed solvent. 2. The slip casting molding method according to claim 1, wherein the mold aggregate is particles insoluble in an organic solvent. 3. It is made from a binder that is soluble in an organic solvent, which is the slip medium, and aggregate particles that are insoluble in the organic solvent, and the binder is made by dissolving an organic resin in a mixed solvent. Features a mold for slip casting molding.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60024323A JPS61185412A (en) | 1985-02-13 | 1985-02-13 | Slip casting molding method and mold for molding |
| KR1019860000682A KR890003502B1 (en) | 1985-02-08 | 1986-02-01 | Method for shaping slip-casting and shaping moulds |
| EP86101459A EP0191409B1 (en) | 1985-02-08 | 1986-02-05 | Slip casting method |
| DE8686101459T DE3667627D1 (en) | 1985-02-08 | 1986-02-05 | SLICK ENERGY PROCESS. |
| US06/827,637 US4871497A (en) | 1985-02-08 | 1986-02-10 | Slip casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60024323A JPS61185412A (en) | 1985-02-13 | 1985-02-13 | Slip casting molding method and mold for molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61185412A JPS61185412A (en) | 1986-08-19 |
| JPH037486B2 true JPH037486B2 (en) | 1991-02-01 |
Family
ID=12134969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60024323A Granted JPS61185412A (en) | 1985-02-08 | 1985-02-13 | Slip casting molding method and mold for molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61185412A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2792714B2 (en) * | 1990-05-09 | 1998-09-03 | 本田技研工業株式会社 | Slip casting method |
| HU220497B1 (en) * | 1997-08-19 | 2002-02-28 | Árpád Kákonyi | Condom with improwed security |
-
1985
- 1985-02-13 JP JP60024323A patent/JPS61185412A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61185412A (en) | 1986-08-19 |
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