JPH0761905B2 - Ceramic tube manufacturing method - Google Patents
Ceramic tube manufacturing methodInfo
- Publication number
- JPH0761905B2 JPH0761905B2 JP2227850A JP22785090A JPH0761905B2 JP H0761905 B2 JPH0761905 B2 JP H0761905B2 JP 2227850 A JP2227850 A JP 2227850A JP 22785090 A JP22785090 A JP 22785090A JP H0761905 B2 JPH0761905 B2 JP H0761905B2
- Authority
- JP
- Japan
- Prior art keywords
- thick
- ceramic tube
- firing
- molded body
- walled
- 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 - Lifetime
Links
- 239000000919 ceramic Substances 0.000 title claims description 37
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 238000010304 firing Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910000873 Beta-alumina solid electrolyte Inorganic materials 0.000 description 2
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Secondary Cells (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、寸法精度の優れた有底直筒状のセラミックス
管を高い歩留り率で効率よく生産することができるセラ
ミックス管の製造方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a ceramic tube which is capable of efficiently producing a bottomed straight cylindrical ceramic tube having excellent dimensional accuracy and a high yield rate. is there.
（従来の技術） 一端が閉じられ、他端が開口した有底直筒状のセラミッ
クス管はナトリウム−硫黄電池やSOxセンサー用の固体
電解質管等に広く使用されているが、厳しい真円度や真
直度等の高い寸法精度が要求されているために、その製
造方法として有底直筒状のセラミックス管成形体を焼成
治具上に他端の開口をもって倒立させて焼成後開口端か
ら所定長さを切断除去して有底直筒状のセラミックス管
とするという方法が採られていた。(Prior Art) A bottomed straight cylindrical ceramics tube with one end closed and the other end open is widely used for solid electrolyte tubes for sodium-sulfur batteries and SOx sensors, etc., but it has severe roundness and straightness. Since high dimensional accuracy such as degree is required, as a manufacturing method thereof, a bottomed straight cylindrical ceramic tube molded body is inverted with an opening at the other end on a firing jig, and after firing, a predetermined length is provided from the opening end. A method of cutting and removing it to form a bottomed straight cylindrical ceramics tube has been adopted.
ところが、従来の方法においてはセラミックス管成形体
はその開口部が胴部径と同一径でストレートに延びた形
状となっているものであり、開口部における強度が十分
でなく焼成時において開口部がラッパ状に拡開したり管
体が傾斜したりして所定範囲内の真円度や真直度が得ら
れず不良品の発生が非常に多いという問題点があり、ま
た、焼成後に切断除去する部分の長さも多く必要で非効
率的な生産になるという問題点もあった。However, in the conventional method, the ceramic tube molded body has a shape in which the opening portion extends straight with the same diameter as the body portion diameter, and the strength of the opening portion is not sufficient and the opening portion during firing is There is a problem that the roundness and straightness within the prescribed range cannot be obtained due to the flared shape being expanded or the pipe body is inclined, and defective products are very often generated. There is also a problem that the length of the part is large and the production becomes inefficient.
（発明が解決しようとする課題） 本発明は上記のような従来の問題点を解決して、焼成中
におけるセラミックス管成形体の開口部の拡開やセラミ
ックス管成形体の傾斜等を防止して寸法精度の優れた有
底直筒状のセラミックス管を歩留りよく生産できるとと
もに、焼成後に切断除去する部分の長さも極力短くして
効率よく生産することができるセラミックス管の製造方
法を提供することを目的として完成されたものである。(Problems to be Solved by the Invention) The present invention solves the above conventional problems and prevents the expansion of the opening of the ceramic tube molded body and the inclination of the ceramic tube molded body during firing. An object of the present invention is to provide a ceramic tube manufacturing method capable of efficiently manufacturing a bottomed straight cylindrical ceramic tube with excellent dimensional accuracy, and efficiently manufacturing by shortening the length of the portion to be cut and removed after firing. It was completed as.
（課題を解決するための手段） 上記の課題を解決するためになされた本発明のセラミッ
クス管の製造方法は、一端が底部により閉じられた有底
の直筒状主体部の他端に外径のみが拡径される厚肉筒部
を続かせたセラミックス管成形体を成形し、これを焼成
治具上に前記厚肉筒部の開口端をもって倒立させて焼成
後前記厚肉筒部を切断除去して有底直筒状のセラミック
ス管とすることを特徴とするものである。(Means for Solving the Problem) The method for manufacturing a ceramics tube of the present invention made to solve the above-mentioned problems is such that only the outer diameter is provided at the other end of the bottomed straight tubular main body whose one end is closed by the bottom. Of the thick-walled cylinder part is formed to form a ceramic tube molded body, which is inverted on a firing jig with the open end of the thick-walled cylinder part to cut and remove the thick-walled cylinder part after firing. Then, a ceramic tube having a bottomed straight cylindrical shape is characterized.
本発明においては、第１段階として図面に示されるよう
な一端が底部（１）により閉じられ、他端が開口とされ
ているセラミックス管成形体（２）をドライバック成形
機などによって成形する点は従来と同様であるが、本発
明ではこのセラミックス管成形体（２）が有底の直筒状
主体部（３）の他端の開口側に外径のみが拡径される厚
肉筒部（４）を続かせたものとして一体成形される。厚
肉筒部（４）はその開口端より直筒状主体部（３）に向
かって徐々に肉厚が薄くなるように成形されており、こ
の直筒状主体部（３）における厚みt0に対し、最大厚み
t1は1.2t0≦t1≦4.5t0の範囲、好ましくは1.5t0≦t1≦
2.5t0の範囲とするのが実用的である。その理由はt1が
1.2t0よりも小さい場合には後述するように焼成時にお
ける厚肉筒部（４）の十分な補強作用が得られず、一
方、t1が4.5t0よりも大きい場合には後工程で切断除去
する量が増大して非経済的となるからである。また、厚
肉筒部（４）の開口端からの距離L1の実用的な長さはセ
ラミックス管成形体（２）の全長L0に対して0.02L0≦L1
≦0.15L0の範囲好ましくは0.04L0≦L1≦0.1L0の範囲と
し、その理由はL1が0.02L0よりも小さい場合には厚肉筒
部（４）の十分な補強作用が得られず、一方L1が0.15L0
よりも大きい場合には切断除去する量が増えて非経済的
となるからである。なお、厚肉筒部（４）の形状は第１
図に示されるものに限定されないことはもちろんであ
り、例えば第２図や第３図に示されるものであってもよ
い。In the present invention, as a first step, a ceramic tube molded body (2) having one end closed by a bottom portion (1) and the other end opened as shown in the drawing is formed by a dry back molding machine or the like. Is the same as the conventional one, but in the present invention, this ceramic pipe molded body (2) is a thick-walled cylinder portion (outer diameter only expanded to the opening side of the other end of the bottomed straight cylindrical main body portion (3) ( It is integrally molded as a continuation of 4). Thick tubular portion (4) is shaped so as to gradually thickness becomes thinner toward the straight cylindrical main body portion (3) from its open end, with respect to the thickness t 0 of the straight tubular main portion (3) , Maximum thickness
t 1 is in the range of 1.2t 0 ≤t 1 ≤4.5t 0 , preferably 1.5t 0 ≤t 1 ≤
It is practical to set the range to 2.5t 0 . The reason is that t 1
If it is smaller than 1.2t 0 , sufficient reinforcement action of the thick-walled cylinder portion (4) at the time of firing cannot be obtained as described later, while if t 1 is larger than 4.5t 0 , it will be post-processed. This is because the amount to be cut and removed increases and it becomes uneconomical. Further, the practical length of the distance L 1 from the opening end of the thick-walled cylinder part (4) is 0.02L 0 ≦ L 1 with respect to the total length L 0 of the ceramic tube molded body (2).
≦ 0.15 L 0 ranges preferably from a range of 0.04L 0 ≦ L 1 ≦ 0.1L 0 , is because sufficient reinforcing effect of the thick tubular portion when L 1 is less than 0.02 L 0 (4) Not obtained, while L 1 is 0.15 L 0
If it is larger than this, the amount to be cut and removed increases, which is uneconomical. The shape of the thick-walled cylinder portion (4) is the first
Of course, it is not limited to those shown in the drawings, and may be those shown in FIGS. 2 and 3, for example.
次に、得られたセラミックス管成形体（２）を通常の焼
成炉内で1200〜1400℃まで昇温して焼成するが、この
時、セラミックス管成形体（２）が自重によって変形し
ないようにするため底部（１）が上になるよう焼成治具
上に厚肉筒部（４）の開口端をもって倒立させた状態で
焼成し、更に必要であればセラミックス管成形体（２）
を他のセラミックス製保護管等で覆って焼成する。この
ようにして焼成を行えばこの焼成段階において十分な強
度を有する厚肉筒部（４）が焼成治具上でセラミックス
管成形体（２）をしっかりと支えた状態を保持している
ので、従来のように開口部がラッパ状に拡開したりセラ
ミックス管成形体（２）の全体が傾斜することも確実に
防止できることとなる。このようにしてセラミックス管
成形体（２）の焼成が終了したならば、これを取り出し
て焼結されたセラミックス管の厚肉筒部（４）を含む所
定長さを切断除去することにより最終製品である有底筒
状のセラミックス管を得るが、この場合、前述のとおり
焼結時における開口部の拡開や管体の傾斜が防止されて
いるので切断除去する部分の長さは極力短くすることが
でき無駄を少なくすることができる。なお、切断除去す
る部分の開口端からの距離L2は前記厚肉筒部（４）の長
さL1に対して1.1L1≦L2≦2.5L1の範囲とすることが好ま
しい このようにして得られた有底直筒状のセラミックス管は
焼成時における成形体の傾斜等が確実に防止されている
ので肉薄のものでも真円度、真直度等の寸法精度に優れ
たものであり、また、最終工程で切断除去する部分の長
さも極力短いもので無駄なく生産されるものである。Next, the obtained ceramic tube molded body (2) is heated in a normal firing furnace at a temperature of 1200 to 1400 ° C. and fired so that the ceramic tube molded body (2) is not deformed by its own weight. In order to do so, the bottom part (1) is fired in an inverted state on the firing jig with the open end of the thick-walled cylinder part (4) so that the bottom part (1) faces upward, and if necessary, the ceramic tube molded body (2).
Is covered with another ceramic protective tube or the like and fired. If the firing is performed in this way, the thick-walled cylinder portion (4) having sufficient strength in this firing step holds the ceramic tube molded body (2) firmly supported on the firing jig. It is possible to reliably prevent the opening from expanding into a trumpet shape and the inclination of the entire ceramic tube molded body (2) as in the conventional case. When the firing of the ceramic tube molded body (2) is completed in this way, it is taken out and the predetermined length including the thick-walled cylindrical portion (4) of the sintered ceramic tube is cut and removed to obtain the final product. A bottomed cylindrical ceramics tube is obtained, but in this case, the length of the portion to be cut and removed should be as short as possible because the expansion of the opening and the inclination of the tube body are prevented during sintering as described above. It is possible to reduce waste. The distance L 2 from the opening end of the portion to be cut and removed is preferably in the range of 1.1L 1 ≦ L 2 ≦ 2.5L 1 with respect to the length L 1 of the thick-walled tubular portion (4). The bottomed straight cylindrical ceramics tube obtained in this way is excellent in dimensional accuracy such as roundness and straightness even if it is thin, since inclination of the molded body during firing is reliably prevented. In addition, the length of the portion to be cut and removed in the final step is as short as possible, and it is produced without waste.
（実施例） 第１図に示されるような管外径40mmのβ−アルミナから
なる有底の直筒状主体部の他端に外径のみが拡径される
厚肉筒部を続かせたセラミックス管成形体〔L0＝460、L
1＝30、L2＝40、t0＝2.15、t1＝5.15（単位:mm）〕を成
形後、これを常法により焼成炉内で焼成治具に倒立させ
て本焼成し、冷却後厚肉筒部から僅かに直筒状主体部側
に入り込んだ一点鎖線で示される線に沿って余分な部分
を切断除去し、有底直筒状のナトリウム−硫黄電池用の
β−アルミナ管を製造した。この製品のスペックは真円
度±0.5％以内、真直度0.6mm以内という厳しいものであ
るが、90％以上の高い良品歩留り率（500本中の良品が4
55本）で生産を行なうことができ、従来の厚肉筒部のな
いストレートタイプでは平均歩留り率約30％に比べて著
しく生産性が向上したことが確認できた。(Example) A ceramic in which a thick tubular portion whose outer diameter is expanded is connected to the other end of a bottomed straight tubular main body made of β-alumina having an outer diameter of 40 mm as shown in FIG. Tube molding [L 0 = 460, L
1 = 30, L 2 = 40, t 0 = 2.15, t 1 = 5.15 (unit: mm)], and then this is inverted by a conventional method in a firing jig in a firing jig for main firing, and after cooling The excess portion was cut off along the line indicated by the alternate long and short dash line slightly entering the straight tubular main body side from the thick-walled tubular portion, and a bottomed straight tubular β-alumina tube for a sodium-sulfur battery was manufactured. . The specifications of this product are such that the roundness is within ± 0.5% and the straightness is within 0.6mm, but the yield rate is 90% or higher.
It was confirmed that the productivity was significantly improved compared to the average yield rate of about 30% in the conventional straight type without a thick-walled cylinder part.
（発明の効果） 以上の説明からも明らかなように、本発明においては、
寸法精度の優れた有底直筒状のセラミックス管を高い歩
留り率で生産できるとともに焼成後に切断除去する部分
も極力少なくして効率的な生産を行なうことができるも
のであり、また、セラミックス管成形体の成形手段や焼
成手段は従来法と殆ど変わることがないので、従来の製
造装置等に大きな変更を加えることなくそのまま使用す
ることができるという利点もある。(Effects of the Invention) As is apparent from the above description, in the present invention,
It is possible to produce a bottomed straight cylindrical ceramic tube with excellent dimensional accuracy at a high yield rate, and also to perform efficient production by reducing the portion cut and removed after firing as much as possible. Since the molding means and the firing means of (1) are almost the same as those of the conventional method, there is also an advantage that they can be used as they are without making a large change to the conventional manufacturing apparatus.
よって、本発明は有底直筒状のセラミックス管を製造す
るうえでの従来の問題点を一掃したセラミックス管の製
造方法として、産業の発展に寄与するところは極めて大
である。Therefore, the present invention is a method of manufacturing a ceramic tube that eliminates the conventional problems in manufacturing a bottomed straight cylindrical ceramic tube, and it greatly contributes to industrial development.
第１図は本発明において第１段階として成形されるセラ
ミックス管成形体の実施例を示す断面図、第２図および
第３図はセラミックス管成形体の厚肉筒部の他の実施例
を示す拡大断面図である。 （１）：底部、（２）：セラミックス管成形体、
（３）：有底の直筒状主体部、（４）：厚肉筒部。FIG. 1 is a cross-sectional view showing an embodiment of a ceramics tube molded body formed as a first step in the present invention, and FIGS. 2 and 3 show another embodiment of a thick-walled cylinder portion of the ceramics tube molded body. It is an expanded sectional view. (1): bottom part, (2): ceramic tube molded body,
(3): bottomed straight tubular main body portion, (4): thick-walled tubular portion.
Claims (1)
主体部の他端に外径のみが拡径される厚肉筒部を続かせ
たセラミックス管成形体を成形し、これを焼成治具上に
前記厚肉筒部の開口端をもって倒立させて焼成後前記厚
肉筒部を切断除去して有底直筒状のセラミックス管とす
ることを特徴とするセラミックス管の製造方法。1. A ceramic tube molded body in which a bottomed straight tubular main body whose one end is closed by a bottom is followed by a thick-walled tubular part whose outer diameter is expanded, is formed and fired. A method for manufacturing a ceramics tube, which comprises inclining an open end of the thick-walled cylinder part on a jig and firing and cutting the thick-walled cylinder part to remove the thick-walled cylinder part to form a bottomed straight cylinder-shaped ceramics tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2227850A JPH0761905B2 (en) | 1990-08-28 | 1990-08-28 | Ceramic tube manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2227850A JPH0761905B2 (en) | 1990-08-28 | 1990-08-28 | Ceramic tube manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04108670A JPH04108670A (en) | 1992-04-09 |
| JPH0761905B2 true JPH0761905B2 (en) | 1995-07-05 |
Family
ID=16867355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2227850A Expired - Lifetime JPH0761905B2 (en) | 1990-08-28 | 1990-08-28 | Ceramic tube manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0761905B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009241400A (en) * | 2008-03-31 | 2009-10-22 | Ngk Insulators Ltd | Calcined ceramic body and manufacturing method of the same |
| JP5499104B2 (en) * | 2012-06-21 | 2014-05-21 | 日本碍子株式会社 | Method for manufacturing ceramic molded body, method for manufacturing ceramic fired body, and ceramic fired body |
-
1990
- 1990-08-28 JP JP2227850A patent/JPH0761905B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04108670A (en) | 1992-04-09 |
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