JPH01249301A - Mold for cast-in molding of slurry - Google Patents
Mold for cast-in molding of slurryInfo
- Publication number
- JPH01249301A JPH01249301A JP7612988A JP7612988A JPH01249301A JP H01249301 A JPH01249301 A JP H01249301A JP 7612988 A JP7612988 A JP 7612988A JP 7612988 A JP7612988 A JP 7612988A JP H01249301 A JPH01249301 A JP H01249301A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- mold
- molded body
- wall surface
- hole
- 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
- 239000002002 slurry Substances 0.000 title claims abstract description 29
- 238000000465 moulding Methods 0.000 title description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000007711 solidification Methods 0.000 claims abstract description 5
- 230000008023 solidification Effects 0.000 claims abstract description 5
- 238000007582 slurry-cast process Methods 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 abstract description 20
- 239000004945 silicone rubber Substances 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910052602 gypsum Inorganic materials 0.000 abstract description 5
- 239000010440 gypsum Substances 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 3
- 230000008719 thickening Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 16
- 239000000919 ceramic Substances 0.000 description 6
- 239000011358 absorbing material Substances 0.000 description 5
- 239000011505 plaster Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 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
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000002612 dispersion medium Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的コ
（産業上の利用分野）
本発明は、セラミックス成形体の製造工程などにおいて
利用されている泥漿鋳込み成形法に用いられる鋳型に関
する。DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention (Industrial Application Field) The present invention relates to a mold used in a slurry casting method used in the manufacturing process of ceramic molded bodies.
（従来の技術）
泥漿鋳込み成形法は、構造材料や電子部品材料などとし
て各種分野において使用されているセラミックス焼結体
の出発物となるセラミックス成形体の製造工程などにお
いて利用されており、たとえばセラミックス粉末に有機
系バインダや分散媒を添加混合して泥漿化し、このセラ
ミックス泥漿を石こうなどの吸水性を存する部材で作製
された鋳型内に注入し、鋳型による吸水によって所要形
状の成形体を作製する方法である。この成形法は他の成
形法に比べて、金型が不要で設備費が安く、作業が簡単
なため、特に大型製品や複雑な形状の製品などのための
成形法として利用価値が高い方法である。(Prior art) The slurry casting method is used in the manufacturing process of ceramic molded bodies, which are the starting material for ceramic sintered bodies used in various fields such as structural materials and electronic component materials. An organic binder and dispersion medium are added and mixed to the powder to form a slurry, and this ceramic slurry is injected into a mold made of a water-absorbing material such as gypsum, and a molded body of the desired shape is created by the mold absorbing water. It's a method. Compared to other molding methods, this molding method does not require a mold, has low equipment costs, and is easy to work with, so it is especially useful as a molding method for large products or products with complex shapes. be.
しかし、目的とする成形体の形状などによっては、まだ
解決すべき点も多い。However, there are still many issues that need to be resolved, depending on the shape of the desired molded product.
その一つとして、たとえばるつぼのような容器状の成形
体を作製しようとする場合には、たとえば第２図に示す
ように、目的とする成形体の外形に相当する凹部を有す
る下型１とこの四部を閉塞して所要のキャビティ３を形
成するように配置され鋳込み口および押湯部分となる貫
通孔２ａを有する上型２とにより鋳型を構成し、このキ
ャビティ３に泥漿を注入して成形体を作製する。ところ
で、このような鋳型を使用して成形体を作製する場合、
押湯部分となる貫通孔２ａの内壁面や泥漿の着肉固体面
以外の上型２の内壁面２ｂにも着肉層が形成されたり、
また泥漿の着肉固化によって形成される成形体４の端面
と接する上型２の内壁面２ｃからの吸水などによって、
上型２の離型時に成形体４の端部に破損が生じるなどの
問題が生じてしまう。また、成形体４の端面と接する上
型２の内壁面２Ｃからの吸水は、成形体４の端部の肉厚
を変化させるなどの不良発生要因にもなっている。この
ため、離型後に成形体４の端部の加工が必要となる。For example, when trying to produce a container-shaped molded body such as a crucible, for example, as shown in FIG. A mold is constituted by an upper mold 2 which is arranged so as to close these four parts to form a required cavity 3 and has a through hole 2a serving as a pouring port and a feeder part, and a slurry is injected into this cavity 3 to form the mold. Create a body. By the way, when producing a molded body using such a mold,
An ink layer is also formed on the inner wall surface 2b of the upper mold 2 other than the inner wall surface of the through hole 2a which becomes the riser part and the solid surface to which the slurry is attached.
In addition, due to water absorption from the inner wall surface 2c of the upper mold 2 that is in contact with the end surface of the molded body 4 formed by the solidification of the slurry,
Problems such as damage to the ends of the molded body 4 occur when the upper mold 2 is released. In addition, water absorption from the inner wall surface 2C of the upper die 2 that is in contact with the end surface of the molded body 4 also causes defects such as changes in the wall thickness of the end portions of the molded body 4. For this reason, it is necessary to process the ends of the molded body 4 after demolding.
そこで、成形体４の離型面となる端面の後加工を行うこ
となく、良好な成形体４を得るための方策として、上型
２の貫通孔２ａの内壁面や上型２の泥漿と接する内壁面
２ｂおよび得られる成形体４の端面が接する内壁面２Ｃ
に、着肉防止用の非吸水性の塗料を塗布したり、あるい
は上型２自体を非吸水性の素材で作製することが行われ
ている。Therefore, as a measure to obtain a good molded body 4 without performing post-processing on the end face which becomes the mold release surface of the molded body 4, the inner wall surface of the through hole 2a of the upper mold 2 and the slurry of the upper mold 2 are An inner wall surface 2C where the inner wall surface 2b and the end surface of the obtained molded body 4 are in contact with each other.
In addition, a non-water-absorbing paint is applied to prevent ink build-up, or the upper mold 2 itself is made of a non-water-absorbing material.
（発明が解決しようとする課題）
ところで、上述した上型２への着肉防止ための塗料とし
ては、アクリル樹脂系塗料やシリコーン樹脂系塗料が一
般的に使用されているが、これら樹脂系塗料の塗膜では
泥漿の吸水を防止する効果はある程度得られているもの
の、離型性にとぼしく、上型２を離型する際に成形体４
の端部の破損を充分に防止するまでには至っていない。(Problem to be Solved by the Invention) By the way, acrylic resin paints and silicone resin paints are generally used as paints for preventing ink buildup on the upper mold 2 described above. Although the coating film has a certain degree of effect in preventing the water absorption of the slurry, the mold releasability is poor, and when the upper mold 2 is released, the molded body 4
However, it has not yet been possible to sufficiently prevent damage to the ends.
そこで、本発明者らは非吸水系の素材としてアクリル樹
脂やシリコーンゴムなどを使用して上型２を作製するこ
とを試みたところ、シリコーンゴムが最も非吸水性およ
び成形体との離型性に優れ、実用的であることを確認し
た。しかし、シリコーンゴム自体は硬度が小さいため、
鋳型としての剛性が不足し、また価格が高いために製造
コストが増大してしまうなど、解決すべき難点も多い。Therefore, the present inventors tried producing the upper mold 2 using acrylic resin, silicone rubber, etc. as a non-water-absorbing material, and found that silicone rubber had the best non-water-absorbing properties and had the best releasability from the molded product. It was confirmed that it is excellent and practical. However, since silicone rubber itself has low hardness,
There are many problems that need to be resolved, such as the lack of rigidity as a mold and the high price, which increases manufacturing costs.
本発明は、このような事情に対処するべくなされたもの
で、成形体との離型性に優れ、亀裂や破損などのない良
質な成形体、たとえばセラミックス成形体を安価に作製
することを可能にした泥漿鋳込み成形用鋳型を提供する
ことを目的とする。The present invention has been made to address these circumstances, and makes it possible to inexpensively produce high-quality molded bodies, such as ceramic molded bodies, that have excellent mold releasability and are free from cracks and damage. The object of the present invention is to provide a mold for slurry casting molding.
［発明の構成］
（課題を解決するための手段）
すなわち本発明は、所要形状のキャビティを有し、泥漿
の鋳込み口および押湯部分となる貫通孔が前記キャビテ
ィに接続するよう設けられ、吸水性を有する多孔質な部
材により形成された分割可能な泥漿鋳込み成形用鋳型に
おいて、前記貫通孔内壁面における押湯面と前記キャビ
ティの泥漿の着肉固体面以外の内壁面および泥漿の着肉
固化によって形成される成形体の端面に相当する内壁面
とにシリコーンゴム層を形成したことを特徴としている
。[Structure of the Invention] (Means for Solving the Problems) That is, the present invention has a cavity of a desired shape, a through hole serving as a slurry pouring port and a feeder portion is provided so as to be connected to the cavity, and a water absorption In a divisible slurry casting mold formed of a porous member having properties, solidification of the slurry and the inner wall surface other than the riser surface on the inner wall surface of the through hole and the solid surface of the cavity where the slurry is attached. It is characterized in that a silicone rubber layer is formed on the inner wall surface corresponding to the end surface of the molded body formed by.
（作 用）
本発明の泥漿鋳込み成形用鋳型においては、鋳込み口と
なる貫通孔の内壁面における押湯面とキャビティにおけ
る泥漿の着肉固体面以外の内壁面および泥漿の着肉固化
によって形成される成形体の端面に相当する内壁面、す
なわち着肉させたくない面を撥水性を有するシリコーン
ゴム層で形成している。これにより、押湯部分や泥漿の
着肉固体面以外の内壁面では泥漿から吸水されることが
ないため、着肉層は形成されない。また、成形体を鋳型
より離型する際の成形体の端面は、他の箇所と同様に吸
水性を有する素材、たとえば石こうと接している面から
のみ吸水が起こり、着肉層の増加などによる肉厚の不均
一を生じることがないとともに、離型時にこの端面の破
損なども生じない。また、このシリコーンゴム層は、鋳
型の表面部のみに形成されており、全体は吸水性を有す
る部材、たとえば石こうにより形成されているため、鋳
型としての剛性が不足することもなく、大型の成形体を
作製するような場合においても、型が変形することなど
によって信頼性が低下することもない。(Function) In the slurry casting mold of the present invention, the slurry is formed by solidifying the slurry on the inner wall surface other than the feeder surface of the through hole serving as the casting opening and the solid surface on which the slurry is deposited in the cavity. The inner wall surface corresponding to the end surface of the molded body, that is, the surface that is not desired to be inked, is formed of a water-repellent silicone rubber layer. As a result, no water is absorbed from the slurry on the inner wall surface other than the feeder portion or the solid surface to which the slurry is attached, so that no deposited layer is formed. In addition, when the molded product is released from the mold, the end face of the molded product absorbs water only from the surface that is in contact with water-absorbing materials, such as gypsum, like other parts, and due to an increase in the adhesive layer, etc. Nonuniformity in wall thickness does not occur, and the end face is not damaged during mold release. In addition, this silicone rubber layer is formed only on the surface of the mold, and the entire mold is made of a water-absorbing material such as gypsum, so the mold does not lack rigidity and can be used for large molding. Even in the case of manufacturing a body, reliability does not deteriorate due to deformation of the mold.
（実施例）
次に、本発明の実施例について図面を参照して説明する
。(Example) Next, an example of the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例の泥漿鋳込み成形用鋳型を
示す断面図である。同図において、１１は石こうのよう
な吸水性を示す多孔質な部材により形成された上方開口
の凹部を有する下型であり、この下型１１の上部には下
型１１の開口を閉塞して所定形状のキャビティ１４を形
成するように上型１２が配置されており、これら下型１
１と上型１２とから泥漿鋳込み成形用鋳型が構成されて
いる。この上型１２は下型１１と同様な部材で形成され
、泥漿の鋳込み口となるとともに泥漿注入後の押湯部分
となる貫通孔１２ａを存しており、かつキャビティ１４
に面する内壁面、泥漿の着肉固化によって形成される成
形体１５の端面に相当する内壁面および貫通孔１２ａの
内壁面に連続してシリコーンゴム層１３が形成されてい
る。FIG. 1 is a sectional view showing a slurry casting mold according to an embodiment of the present invention. In the figure, reference numeral 11 is a lower mold having a recess with an upward opening formed of a porous material exhibiting water absorption properties such as gypsum. An upper mold 12 is arranged to form a cavity 14 of a predetermined shape, and these lower molds 1
1 and the upper mold 12 constitute a slurry casting mold. This upper mold 12 is made of the same material as the lower mold 11, and has a through hole 12a that serves as a slurry injection port and a riser portion after pouring the slurry, and has a cavity 14.
A silicone rubber layer 13 is formed continuously on the inner wall surface facing , the inner wall surface corresponding to the end surface of the molded body 15 formed by solidification of the slurry, and the inner wall surface of the through hole 12a.
このような表面にシリコーンゴム層１３を有する上型１
２は、たとえば次のようにして形成することができる。Upper mold 1 having such a silicone rubber layer 13 on its surface
2 can be formed, for example, as follows.
すなわちまず、予めシリコーンゴム層が占有する部分を
除いた形状の石こう型を作製し、これをキャビティと同
等形状のマスターとなる型の上に載置し、石こう型とマ
スターとなる型との間の空隙、すなわちシリコーンゴム
層が形成される空隙に、硬化剤を加えて混練、脱泡した
シリコーンゴム液を流し込んで固化させ、マスターとな
る型から離型することによって、必要部分にシリコーン
ゴム層を有する石こう型が得られる。That is, first, a plaster mold with a shape excluding the portion occupied by the silicone rubber layer is prepared in advance, and this is placed on a master mold with the same shape as the cavity, and the space between the plaster mold and the master mold is created. The silicone rubber liquid, which has been kneaded and defoamed with a curing agent, is poured into the voids where the silicone rubber layer will be formed, solidified, and then released from the master mold to form the silicone rubber layer in the required areas. A plaster mold having the following properties is obtained.
このシリコーンゴム層は、１ｍｍ〜３０ｍｍ程度の厚さ
を有するものが適しており、好ましい厚さとしては３ｍ
ａ＋〜１５ｍｍの範囲である。シリコーンゴム層の厚さ
が１ｒＢｍ未満であるとシリコーンゴム層が石こう型か
ら剥離しやすくなり、３０■を超えてもそれ以上の効果
が得られないばかりでなく、全体の大きさにもよるが鋳
型全体としての剛性が不足する。なお、この実施例にお
けるシリコーンゴム層１３の厚さは、５Ｉｌ１ｍに設定
した。Suitably, this silicone rubber layer has a thickness of about 1 mm to 30 mm, with a preferable thickness of 3 m.
The range is from a+ to 15 mm. If the thickness of the silicone rubber layer is less than 1 rBm, the silicone rubber layer will easily peel off from the plaster mold, and if it exceeds 30 cm, not only will no further effect be obtained, but it will depend on the overall size. The rigidity of the mold as a whole is insufficient. The thickness of the silicone rubber layer 13 in this example was set to 5Il1m.
上記構成の本実施例の泥漿鋳込み成形用鋳型をいて、焼
結助剤としてイツトリアおよびアルミナを所定量含有す
る窒化ケイ素調合粉末１００重量部に対して水５０重量
部と適量の分散剤および有機系バインダを加え、１５時
間混合して作製した泥漿を用いて、下記の手順に従い実
際に外径１２０ｍｍＸ高さ １５０１１１Ｉ１１のるつ
ぼ形状のセラミックス成形体を作製した。The slurry casting mold of this example having the above configuration was used, and 50 parts by weight of water and an appropriate amount of a dispersant and an organic compound were added to 100 parts by weight of silicon nitride mixed powder containing a predetermined amount of ittria and alumina as sintering aids. Using a slurry prepared by adding a binder and mixing for 15 hours, a crucible-shaped ceramic molded body having an outer diameter of 120 mm and a height of 150111I11 was actually prepared according to the following procedure.
すなわちまず、上記泥漿を貫通孔１２ａより徐々にこの
貫通孔内に達するまで注入し、次いで所定時間経過させ
、泥漿がキャビティ１４の内壁に着肉固化し所要形状の
成形体１５が形成された後、余分な泥漿を貫通孔１２ａ
より排泥した。この後、上型１２を離型して下型１１よ
り成形体１５を取出すことにより、目的とする成形体を
得た。That is, first, the slurry is gradually injected into the through hole 12a until it reaches the inside of the through hole, and then a predetermined period of time is allowed to adhere and harden on the inner wall of the cavity 14 to form a molded body 15 of the desired shape. , excess slurry is removed from the through hole 12a.
More mud was removed. Thereafter, the upper mold 12 was released and the molded object 15 was taken out from the lower mold 11, thereby obtaining the desired molded object.
得られた成形体は、成形体端部に破損や亀裂なども見ら
れず、また端部の肉厚も他の部分と同一の厚さを有し、
全体の肉厚が均一なものであった。The obtained molded product showed no damage or cracks at the ends of the molded product, and the thickness of the end portion was the same as that of other parts.
The overall thickness was uniform.
［発明の効果］
以上説明したように本発明の泥漿鋳込み成形用鋳型によ
れば、鋳型の離型性不足などに起因する成形体端部の欠
けや亀裂などを発生させることなく、全体の肉厚が均一
な良質な成形体が得られる。[Effects of the Invention] As explained above, according to the slurry casting mold of the present invention, the overall thickness of the molded product can be improved without chipping or cracking at the ends of the molded product caused by insufficient mold releasability. A high-quality molded product with a uniform thickness can be obtained.
また、シリコーンゴム層を必要部分のみに設け、全体は
石こうのような通常鋳型を構成する部材により形成して
いるので、製造コストも安く、鋳型全体としての剛性不
足を生じるようなこともない。Furthermore, since the silicone rubber layer is provided only in the necessary parts and the entire mold is made of a material such as plaster that normally constitutes a mold, manufacturing costs are low and the mold as a whole does not lack rigidity.
第１図は本発明の一実施例の泥漿鋳込み成形用鋳型を示
す断面図、第２図は従来の泥漿鋳込み成形用鋳型を示す
断面図である。
１１・・・・・・・・・下型
１２・・・・・・・・・上型
１３・・・・・・・・・シリコーンゴム層１４・・・・
・・・・・キャビティ
代理人 弁理士 則 近 憲 装
置 湯 山 幸 夫第１図
第２図FIG. 1 is a sectional view showing a slurry casting mold according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional slurry casting mold. 11...Lower die 12...Upper die 13...Silicone rubber layer 14...
... Cavity agent Patent attorney Nori Chika Equipment Yukio Yuyama Figure 1 Figure 2
Claims (1)
よび押湯部分となる貫通孔が前記キャビティに接続する
よう設けられ、吸水性を有する多孔質な部材により形成
された分割可能な泥漿鋳込み成形用鋳型において、 前記貫通孔内壁面における押湯面と前記キャビティの泥
漿の着肉固化面以外の内壁面および泥漿の着肉固化によ
って形成される成形体の端面に相当する内壁面とにシリ
コーンゴム層を形成したことを特徴とする泥漿鋳込み成
形用鋳型。(1) A divisible slurry casting having a cavity of a desired shape, having a through hole connected to the cavity to serve as a slurry inlet and a feeder, and formed of a porous member having water absorption properties. In the mold, silicone is applied to the feeder surface of the inner wall surface of the through hole, the inner wall surface of the cavity other than the surface where the slurry is solidified, and the inner wall surface corresponding to the end surface of the molded body formed by the solidification of the slurry. A slurry casting mold characterized by forming a rubber layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7612988A JPH01249301A (en) | 1988-03-31 | 1988-03-31 | Mold for cast-in molding of slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7612988A JPH01249301A (en) | 1988-03-31 | 1988-03-31 | Mold for cast-in molding of slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01249301A true JPH01249301A (en) | 1989-10-04 |
Family
ID=13596328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7612988A Pending JPH01249301A (en) | 1988-03-31 | 1988-03-31 | Mold for cast-in molding of slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01249301A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04329103A (en) * | 1991-04-30 | 1992-11-17 | Murata Mfg Co Ltd | Molding frame of ceramics and manufacture of ceramic molded product using the same |
| JPH0541716U (en) * | 1991-11-13 | 1993-06-08 | 積水化学工業株式会社 | Molding equipment for hydraulic inorganic moldings |
-
1988
- 1988-03-31 JP JP7612988A patent/JPH01249301A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04329103A (en) * | 1991-04-30 | 1992-11-17 | Murata Mfg Co Ltd | Molding frame of ceramics and manufacture of ceramic molded product using the same |
| JPH0541716U (en) * | 1991-11-13 | 1993-06-08 | 積水化学工業株式会社 | Molding equipment for hydraulic inorganic moldings |
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