JPH02289304A - Manufacture of ceramic parts having hollow part - Google Patents
Manufacture of ceramic parts having hollow partInfo
- Publication number
- JPH02289304A JPH02289304A JP11033589A JP11033589A JPH02289304A JP H02289304 A JPH02289304 A JP H02289304A JP 11033589 A JP11033589 A JP 11033589A JP 11033589 A JP11033589 A JP 11033589A JP H02289304 A JPH02289304 A JP H02289304A
- Authority
- JP
- Japan
- Prior art keywords
- core
- molded body
- ceramic
- ceramic powder
- rubber mold
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 26
- 238000002844 melting Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000005245 sintering Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 238000004421 molding of ceramic Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000000462 isostatic pressing Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は中空管などの中空部を有するセラミック部品
の製造方法に関し、特に静水圧成形（ラバープレス）な
どの方法によってセラミック粉末を加圧して所定の形状
の成形体を得、しかる後にその成形体を焼結するセラミ
ック部品の製造方法に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method of manufacturing ceramic parts having a hollow portion such as a hollow tube, and in particular, a method of manufacturing ceramic parts having a hollow portion such as a hollow tube, and in particular presses ceramic powder into a predetermined shape using a method such as isostatic pressing (rubber press). The present invention relates to a method for manufacturing ceramic parts, which involves obtaining a molded body having the shape of , and then sintering the molded body.
従来の技術
セラミック粉末を原料としてセラミック部品を製造する
基本的な方法は、先ずセラミック粉末を所定の形状に成
形して成形体を得、しかる後にその成形体を焼結づる方
法であるが、その成形体を得る方法としては、プレス成
形や静水圧成形などの方法が知られている。ところで、
得るべき部品が中空部を有する場合、例えば中空管であ
る場合、従来、次のような方法が採用されていた。すな
わち原料であるセラミック粉末をプレス成形などの方法
で円柱状に成形し、これを仮焼結しである程度の強度を
付与し、その状態で機械加工により中心軸線に沿って中
空部を穿孔し、しかる後本焼結を行なっている。しかし
ながらこの方法では、仮焼結を行なうために、工程数が
それだけ多くなり、製造時間が長くなる問題があり、ま
た仮焼結後の成形体は、相当の強度・剛性を有すること
になるために、穿孔のための機械加工に時間を要し、ま
た切削工具の摩耗の進行が速くなるなどの問題がある。Conventional technology The basic method for manufacturing ceramic parts using ceramic powder as a raw material is to first form the ceramic powder into a predetermined shape to obtain a compact, and then sinter the compact. As a method for obtaining a molded body, methods such as press molding and isostatic pressing are known. by the way,
When the part to be obtained has a hollow part, for example, a hollow tube, the following method has conventionally been adopted. That is, the ceramic powder that is the raw material is formed into a cylindrical shape using a method such as press molding, it is temporarily sintered to give it a certain degree of strength, and in this state, a hollow part is bored along the central axis by machining. After that, main sintering is performed. However, this method has the problem of increasing the number of steps and lengthening the manufacturing time due to pre-sintering, and the molded product after pre-sintering has considerable strength and rigidity. Another problem is that machining for drilling takes time and the cutting tool wears out more quickly.
このような問題を解決する方法として心棒などの中子を
用いて中空状の成形体を先ず製造し、これを焼結する方
法が知られている。この方法は、金属製の心棒（中子）
と円筒状のゴム型とを同心状に配置し、その中子の外周
とゴム型の内周との間にセラミック粉末を充填し、これ
を液体中で加圧し、すなわち静水圧成形し、しかる後ゴ
ム型および中子を成形体から取外して円筒状の成形体を
作り、これを焼結する方法である。As a method for solving such problems, a method is known in which a hollow molded body is first manufactured using a core such as a mandrel, and then this is sintered. This method uses a metal mandrel (core)
and a cylindrical rubber mold are arranged concentrically, ceramic powder is filled between the outer periphery of the core and the inner periphery of the rubber mold, and this is pressurized in a liquid, that is, isostatically formed, and then In this method, the rubber mold and core are removed from the molded body to produce a cylindrical molded body, and this is sintered.
発明が解決しようとする課題
上述した中子を使用し、静水圧成形（ラバープレス）を
行なって成形体を得る方法では、成形体が円筒状である
ために、仮焼結および礪械加工による穿孔を省くことが
できる。しかしながら静水圧成形では、２〜３′″ン／
ｃｄ程度の圧力でセラミック粉末を加圧するため、成
形体と中子とが強固に嵌合した状態になり、中子の抜き
取りが困難になる問題があった。このような問題を解決
するために、中子を合成樹脂製とし、成形体の焼結時に
中子を溶融させて除去する方法も考えられているが、合
成樹脂製の中子はそれ自体が弾性を有するために静水圧
成形の完了後に圧力を解除した際に、中子の弾性膨張に
よって成形体に亀裂が入るおそれが多分にあり、また合
成樹脂製の中子は剛性が低いために、パイプ成形用の細
長い中子にあっては所謂センタリングを行ない難い問題
があった。Problems to be Solved by the Invention In the method of obtaining a molded body by using the above-mentioned core and performing isostatic pressing (rubber press), since the molded body is cylindrical, it is difficult to obtain a molded body by pre-sintering and machining. Perforation can be omitted. However, in isostatic pressing, the
Since the ceramic powder is pressurized with a pressure of approximately CD, the molded body and the core are tightly fitted together, making it difficult to remove the core. In order to solve this problem, a method has been considered in which the core is made of synthetic resin and the core is melted and removed when the molded body is sintered, but the synthetic resin core itself is Because of its elasticity, when the pressure is released after isostatic pressing is completed, there is a high risk that the molded product will crack due to the elastic expansion of the core, and since the synthetic resin core has low rigidity, With elongated cores for pipe forming, there is a problem in that it is difficult to perform so-called centering.
この発明は上記の事情に兎みてなされたもので、中空部
を形成するための中子を成形体から容易に抜ぎ取ること
ができ、それに伴って製造作業性を向上させるこができ
るセラミック部品の製造方法を提供で−ることを目的と
するものである。This invention has been made in view of the above circumstances, and provides a ceramic component in which the core for forming the hollow portion can be easily removed from the molded body, thereby improving manufacturing workability. The purpose of this invention is to provide a method for manufacturing the same.
課題を解決するための手段
この発明は、上記の目的を達成するために、円形断面の
中子の外周側にセラミック粉末を充填するとともに、そ
のセラミック粉末を加圧して所定の形状に成形し、得ら
れた成形体を焼結することによってセラミック部品を製
造するにあたり、中子の外表面に螺旋状の凸部もしくは
凹部を形成しておき、セラミック粉末の加圧成形後にそ
の中子を回転させて成形体から抜き取ることを特徴とす
る方法である。Means for Solving the Problems In order to achieve the above-mentioned object, the present invention includes filling the outer peripheral side of a core with a circular cross section with ceramic powder, pressurizing the ceramic powder to shape it into a predetermined shape, When producing ceramic parts by sintering the obtained compact, spiral convex or concave portions are formed on the outer surface of the core, and the core is rotated after pressure molding of the ceramic powder. This method is characterized in that the molded body is extracted from the molded body using the following steps.
またこの発明では、前記中子の外表面に低融点材料を予
め塗布しておくことができる。Further, in the present invention, the outer surface of the core may be coated with a low melting point material in advance.
作 用
この発明の方法においては、成形体は中子の外周側にセ
ラミック粉末を充填し、これを加圧することにより得ら
れる。そしてこの発明では、中子がその外周に螺旋状の
凸部もしくは凹部を備えているため、中子を成形体に対
して回転させれば所謂ネジの作用により中子を成形体か
ら抜き取ることができる。Function: In the method of the present invention, a molded body is obtained by filling the outer peripheral side of a core with ceramic powder and pressurizing the powder. In addition, in this invention, since the core has a spiral convex portion or concave portion on its outer periphery, when the core is rotated relative to the molded body, the core can be pulled out from the molded body by the action of a so-called screw. can.
また中子の外表面に低融点材料を予め塗布しておけば、
加圧成形後に中子を加熱することによりその低融点材料
を溶融し、これにより中子と成形体との間に隙間をあけ
て中子を成形体から容易に抜き取ることができる。In addition, if a low melting point material is applied to the outer surface of the core in advance,
By heating the core after pressure molding, the low melting point material is melted, thereby creating a gap between the core and the molded body, so that the core can be easily extracted from the molded body.
実 施 例 つぎにこの発明を実施例に基づいて説明する。Example Next, the present invention will be explained based on examples.
第１図はこの発明の方法の実施状況の一例を示す模式図
であって、セラミック製の中空管を製造する場合にこの
発明を適用した例を示すものである。すなわち第１図生
得号１は中子（心棒）を小し、この中子１は金Ｒ（ステ
ンレス鋼、銅等）によって丸棒状に形成され、またその
外周面には螺旋状の凸部２が全体に亘って形成されてい
る。また第１図申付号３は円筒状のゴム型を示し、この
ゴム型３と中子１とは同心状に配置され、さらにそのゴ
ム型３の両端部はゴム栓４によって密閉されている。な
お中子１はゴム栓４を貫通してゴム型３の外部に突出し
ている。そして中子１の外周側すなわち中子１とゴム型
３との間の空間部にセラミック粉末５が充填されている
。なお特には図示しないがいずれか一方のゴム栓４には
脱気孔が形成され、その脱気孔からセラミック粉末５中
の残存空気が抜き取られる。FIG. 1 is a schematic diagram showing an example of the implementation status of the method of the present invention, and shows an example in which the present invention is applied to the production of a ceramic hollow tube. In other words, the original number 1 in Figure 1 has a small core (mandrel), and this core 1 is formed into a round bar shape from gold R (stainless steel, copper, etc.), and has a spiral convex part 2 on its outer peripheral surface. is formed throughout. In addition, notice number 3 in Figure 1 shows a cylindrical rubber mold, and this rubber mold 3 and core 1 are arranged concentrically, and both ends of the rubber mold 3 are sealed with rubber stoppers 4. . Note that the core 1 penetrates the rubber stopper 4 and protrudes to the outside of the rubber mold 3. The outer peripheral side of the core 1, that is, the space between the core 1 and the rubber mold 3, is filled with ceramic powder 5. Although not specifically shown, a deaeration hole is formed in one of the rubber plugs 4, and the remaining air in the ceramic powder 5 is extracted from the deaeration hole.
上記のように中子１とゴム型３およびゴム栓４との間に
充填したセラミック粉末５はそのまま圧力容器内の加圧
媒体（液体）（それぞれ図示せず）中に浸漬され、その
状態で所定時間加圧されることにより、粉末粒子同士が
結合して成形体５ａとなる。しかる後圧力容器から取り
出すとともに、ゴム栓４を取外し、ついでゴム型３を抜
き取り、さらにセラミック成形体５ａから中子１を抜き
取る。その場合、中子１を回転させれば、その外周面に
螺旋状の凸部２が形成されているために、中子１はセラ
ミック成形体５ａに対して回転させるに伴ってその軸線
方向に次第に移動して抜き取られる。このようにして得
られた円筒状のセラミック成形体５ａは事後的に焼結さ
れて製品とされる。As described above, the ceramic powder 5 filled between the core 1, the rubber mold 3, and the rubber stopper 4 is immersed as it is in the pressurized medium (liquid) (not shown) in the pressure vessel, and remains in that state. By being pressurized for a predetermined period of time, the powder particles are bonded to each other to form a compact 5a. Thereafter, the ceramic molded body 5a is taken out from the pressure vessel, the rubber stopper 4 is removed, the rubber mold 3 is taken out, and the core 1 is taken out from the ceramic molded body 5a. In that case, when the core 1 is rotated, since the spiral convex portion 2 is formed on the outer circumferential surface, the core 1 will move in the axial direction as it is rotated relative to the ceramic molded body 5a. It gradually moves and is removed. The thus obtained cylindrical ceramic molded body 5a is subsequently sintered into a product.
したがって上記の方法によれば、中子１の抜き取りは、
これを回転させることにより容易に行なうことができ、
その結果、セラミック成形体５ａの製造を迅速にしかも
簡単に行なうことができる。Therefore, according to the above method, the extraction of the core 1 is as follows:
This can be easily done by rotating the
As a result, the ceramic molded body 5a can be manufactured quickly and easily.
また中子１を金属製としておけば、セラミック粉末５が
静水圧加圧時に中子１に食い付くことが防止され、この
点でも中子１の抜き取りを容易に行なうことが可能にな
り、かつ中子１の弾性膨張が殆ど生じないために静水圧
成形完了時にセラミック成形体５ａに亀裂が入るなどの
不都合を未然に防止することができる。Furthermore, if the core 1 is made of metal, the ceramic powder 5 will be prevented from sticking to the core 1 during hydrostatic pressurization, and in this respect, the core 1 can be easily removed. Since almost no elastic expansion of the core 1 occurs, inconveniences such as cracks appearing in the ceramic molded body 5a upon completion of hydrostatic pressing can be prevented.
なおこの発明の方法では、第２図に承り中子１を使用す
ることもできる。すなわち第２図に示す中子１は外周面
に螺旋状の凸部２を形成し、さらにその外周に低融点材
料６、例えば低融点ポリオレフィンを塗布したものであ
る。この第２図に示す中子１を使用して静水圧成形を行
ない、しかる後中子１を抜き取る場合には、中子１もし
くは中子１とセラミック成形体５ａとを低融点材料６の
融点より若干高い温度まで加熱し、これを溶融除去して
中子１とセラミック成形体５ａとの間に隙間を形成し、
その状態で中子１をセラミック成形体５ａから抜き取る
。したがってこのような方法では、中子１がセラミック
成形体５ａに対して遊嵌状態になるので中子１を極めて
容易に抜き取ることができる。また低融材料６を溶融さ
せる温度は低温であるため、特にエネルギコストが高く
なることはない。In addition, in the method of this invention, the core 1 shown in FIG. 2 can also be used. That is, the core 1 shown in FIG. 2 has a spiral protrusion 2 formed on its outer peripheral surface, and further coated with a low melting point material 6, such as a low melting point polyolefin, on the outer periphery. When performing isostatic pressing using the core 1 shown in FIG. heating to a slightly higher temperature and melting and removing it to form a gap between the core 1 and the ceramic molded body 5a,
In this state, the core 1 is extracted from the ceramic molded body 5a. Therefore, in this method, the core 1 is loosely fitted into the ceramic molded body 5a, so that the core 1 can be removed very easily. Furthermore, since the temperature at which the low-melting material 6 is melted is low, the energy cost does not particularly increase.
なお上記の実施例では、中子１の外周面に螺旋状の凸部
２を形成したが、この発明を実施するにあたっては、凸
部２の代りに螺旋状の凹部を外周面に形成した中子を使
用することもできる。またこの発明の方法は、セラミッ
ク製のバイブを製造する場合に限らず、中子によって形
成すべき中空部を有する他の一般のセラミック部品を製
造する場合にも適用することができる。さらに低融点材
料は、高分子有機材料に限らず低融点金属を使用するこ
とができる。そしてまたセラミック粉末を加圧成形する
方法は上述した静水圧成形に限られない。In the above embodiment, the spiral convex portion 2 was formed on the outer circumferential surface of the core 1, but in carrying out this invention, a spiral concave portion was formed on the outer circumferential surface of the core 1 instead of the convex portion 2. You can also use children. Furthermore, the method of the present invention can be applied not only to the production of ceramic vibrators, but also to the production of other general ceramic parts having a hollow portion to be formed by a core. Further, the low melting point material is not limited to a polymeric organic material, but a low melting point metal can also be used. Furthermore, the method of pressure molding the ceramic powder is not limited to the above-mentioned isostatic pressing.
発明の効果
以上の説明から明らかなようにこの発明の方法によれば
、成形体からの中子の抜き取りは、中子を回転させるこ
とにより行なうことができるので、中子を使用して中空
部を有するセラミック成形体を＄ｌ造する作業が簡単に
なり、また製造時間の短縮イヒを図ることができる。さ
らに中子の外周面に低融点材料を予め塗布しておけば、
加熱することによりその低融点材料を溶融除去して中子
をセラミック成形体に対して１１１ｉ！Ｉ！状態にする
ことができるので、中子の抜き取りが更に容易になる。Effects of the Invention As is clear from the above explanation, according to the method of the present invention, the core can be removed from the molded body by rotating the core. This simplifies the process of manufacturing a ceramic molded body having the following properties, and the manufacturing time can be greatly reduced. Furthermore, if a low melting point material is applied to the outer peripheral surface of the core in advance,
By heating, the low melting point material is melted and removed, and the core is attached to the ceramic molded body. I! This makes it easier to remove the core.
第１図はこの発明の一実施状況を示すための模式図、第
２図はこの発明を実施するにあたって使用することので
きる他の中子を示す部分拡大図である。
１・・・中子、 ２・・・凸部、 ３・・・ゴム型、
５・・・セラミック粉末、 ５ａ・・・セラミック成形
体、 ６・・・低融点材料。
出願人 ｉｆ！ｉ色電線株式会社FIG. 1 is a schematic diagram showing one implementation situation of the present invention, and FIG. 2 is a partially enlarged view showing another core that can be used in implementing the invention. 1... Core, 2... Convex portion, 3... Rubber mold,
5... Ceramic powder, 5a... Ceramic molded body, 6... Low melting point material. Applicant if! i Color Electric Wire Co., Ltd.
Claims (2)
するとともに、そのセラミック粉末を加圧して所定の形
状に成形し、得られた成形体を焼結することによってセ
ラミック部品を製造するにあたり、 前記中子の外表面に螺旋状の凸部もしくは凹部を形成し
ておき、前記セラミック粉末の加圧成形後に前記中子を
回転させて成形体から抜き取ることを特徴とする中空部
を有するセラミック部品の製造方法。(1) In manufacturing ceramic parts by filling the outer circumference of a core with a circular cross section with ceramic powder, pressurizing the ceramic powder to form it into a predetermined shape, and sintering the resulting molded body. , A ceramic having a hollow portion, wherein a spiral convex portion or a concave portion is formed on the outer surface of the core, and the core is rotated and extracted from the molded body after pressure molding of the ceramic powder. How the parts are manufactured.
くことを特徴とする請求項１に記載の中空部を有するセ
ラミック部品の製造方法。(2) The method for manufacturing a ceramic component having a hollow portion according to claim 1, characterized in that a low melting point material is applied in advance to the outer surface of the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11033589A JP2724747B2 (en) | 1989-04-28 | 1989-04-28 | Method of manufacturing ceramic part having hollow part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11033589A JP2724747B2 (en) | 1989-04-28 | 1989-04-28 | Method of manufacturing ceramic part having hollow part |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02289304A true JPH02289304A (en) | 1990-11-29 |
| JP2724747B2 JP2724747B2 (en) | 1998-03-09 |
Family
ID=14533142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11033589A Expired - Fee Related JP2724747B2 (en) | 1989-04-28 | 1989-04-28 | Method of manufacturing ceramic part having hollow part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2724747B2 (en) |
-
1989
- 1989-04-28 JP JP11033589A patent/JP2724747B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2724747B2 (en) | 1998-03-09 |
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