JP2009242193A - Sleeve molded body and sleeve - Google Patents
Sleeve molded body and sleeve Download PDFInfo
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- JP2009242193A JP2009242193A JP2008092433A JP2008092433A JP2009242193A JP 2009242193 A JP2009242193 A JP 2009242193A JP 2008092433 A JP2008092433 A JP 2008092433A JP 2008092433 A JP2008092433 A JP 2008092433A JP 2009242193 A JP2009242193 A JP 2009242193A
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- 230000007423 decrease Effects 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 8
- 239000011521 glass Substances 0.000 description 5
- 238000009694 cold isostatic pressing Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006060 molten glass Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
- 239000011449 brick Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Powder Metallurgy (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
本発明は、スリーブ成形体及びスリーブに関し、特に管ガラスを成形するための耐火物からなるスリーブ成形体及びスリーブに関する。 The present invention relates to a sleeve molded body and a sleeve, and more particularly to a sleeve molded body and a sleeve made of a refractory material for molding a tube glass.
工業用途において、円筒状のガラス（以下、管ガラスと呼ぶ）を連続成形する方法の一つに、先端を絞り込んだセラミックス管（以下、スリーブと呼ぶ）を用いるダンナー法がある。
このダンナー法は、図４に示すように、スリーブ５０を、ブローパイプを兼ねたシャフト５１に同軸に固定し、先端部を下方に傾斜させて軸周りに回転させる。そして、スリーブ５０の外周面に溶融ガラス５２を巻き付け、ブローパイプから空気を開口５０ａから噴出させると共に、先端部から溶融ガラス５２を引き出して管状に形成するものである。
In industrial applications, one method for continuously forming cylindrical glass (hereinafter referred to as tube glass) is the Danner method using a ceramic tube (hereinafter referred to as a sleeve) with a narrowed tip.
In this Dunner method, as shown in FIG. 4, the
ところで、前記スリーブ５０を形成するための材料としては、耐熱性に優れ、ガラスとの反応が無く、製作性が良いものが求められる。このため、一般には酸化アルミニウムを主体とするセラミックス（多くは焼結レンガ）が用いられている（特許文献１参照）。
By the way, a material for forming the
このスリーブは、ＣＩＰ成形（冷間等方圧加圧法）、鋳込み成形等により成形体を製作し、この成形体を所定の条件下で焼成あるいは焼結することにより製造される。
即ち、ＣＩＰ成形（冷間等方圧加圧法）、鋳込み成形等により耐火物からなるスリーブ成形体６０を成形した後、図５、図６に示すように、前記中子を引き抜くことで、内部空間を有するスリーブ成形体６０を形成する。尚、スリーブ成形体６０の先端付近における、内径が縮径した縮径部６０ｂは、中子７０の先端形状によって形成される。ここで、図５のスリーブ５０（スリーブ成形体６０）は、縮径部６０ｂの形状が凹曲面の場合を示し、図６のスリーブ５０（スリーブ成形体６０）は、縮径部６０ｂがテーパ状に形成された場合を示している。
そして、前記スリーブ成形体６０を所定の条件下で焼成あるいは焼結することによって、スリーブ５０が製造される。
That is, after forming the sleeve molded
And the
しかしながら、従来にあっては、図５、図６に示すようにスリーブ成形体６０の成形後、中子７０を引き抜くと、縮径部６０ｂの付近、特に開口６０ａとスリーブ成形体６０の内部空間とを連通する貫通孔６０ｄの周壁において割れや欠け等の破損部５０ｃが生じ易いという技術的課題があった。
However, conventionally, as shown in FIGS. 5 and 6, when the
本発明は、前記したような事情の下になされたものであり、成形後において中子を引き抜く際に生じる破損を防止し、歩留まりを向上させたスリーブ成形体及びスリーブを提供することを目的とする。 The present invention has been made under the circumstances as described above, and it is an object of the present invention to provide a sleeve molded body and a sleeve that prevent breakage that occurs when the core is pulled out after molding and improve the yield. To do.
前記した課題を解決するために、本発明に係るスリーブ成形体は、円筒状の直胴部と、前記直胴部の先端に形成された円錐台状の頭部と備え、前記円錐台状の頭部には前記直胴部の内部空間と連通する開口が形成された、耐火物からなるスリーブ成形体において、前記直胴部の内壁には、内径は一定な定径部と、前記直胴部の先端側から前記頭部側にかけて、前記内径が漸減縮小する凹曲面状の縮径部が形成され、前記直胴部の前記内径Ｎと前記縮径部の曲率半径Ｒ１との関係が、Ｎ≧３００ｍｍ、かつＲ１＞Ｎであることを特徴としている。 In order to solve the above-described problems, a sleeve molded body according to the present invention includes a cylindrical straight body portion and a truncated cone-shaped head formed at a tip of the straight body portion, and the truncated cone-shaped body. In a sleeve molded body made of a refractory, the head is formed with an opening that communicates with the internal space of the straight body, and the inner wall of the straight body includes a constant diameter portion having a constant inner diameter, and the straight body A concave-curved diameter-reduced portion in which the inner diameter gradually decreases from the tip side of the portion to the head side is formed, and the relationship between the inner diameter N of the straight body portion and the radius of curvature R1 of the reduced-diameter portion is N ≧ 300 mm and R1> N.
このように直胴部における定径部の内径Ｎと縮径部における曲率半径Ｒ１との関係を、Ｎ≧３００ｍｍ、かつＲ１＞Ｎとすることにより、成形体強度よりも中子と縮径部との密着力が小さくなるため、成形後に中子を引き抜いたに生じる縮径部の割れや欠け等を防止することができる。 In this way, by setting the relationship between the inner diameter N of the constant diameter portion in the straight body portion and the curvature radius R1 in the reduced diameter portion to be N ≧ 300 mm and R1> N, the core and the reduced diameter portion have a larger strength than the molded body strength. Therefore, it is possible to prevent cracking or chipping of the reduced diameter portion that occurs when the core is pulled out after molding.
また前記課題を解決するために、本発明に係るスリーブ成形体は、円筒状の直胴部と、前記直胴部の先端に形成された円錐台状の頭部と備え、前記円錐台状の頭部には前記直胴部の内部空間と連通する開口が形成された、耐火物からなるスリーブ成形体において、前記直胴部の内壁には、内径は一定な定径部と、前記直胴部の先端側から前記頭部側にかけて、前記内径が漸減縮小するテーパ状の縮径部と、前記定径部と縮径部とを接続する接続部とが形成され、前記内径Ｎと、前記縮径部のテーパ角θと、前記接続部の曲率半径Ｒ２が、Ｎ≧３００ｍｍ、θ≦３０°、Ｒ２≧２０ｍｍであることを特徴としている。 In order to solve the above-mentioned problem, a sleeve molded body according to the present invention includes a cylindrical straight body portion and a truncated cone-shaped head formed at a tip of the straight body portion, and the truncated cone-shaped body. In a sleeve molded body made of a refractory, the head is formed with an opening that communicates with the internal space of the straight body, and the inner wall of the straight body includes a constant diameter portion having a constant inner diameter, and the straight body A tapered diameter-reducing portion in which the inner diameter gradually decreases from the distal end side of the portion to the head side, and a connecting portion that connects the constant diameter portion and the reduced-diameter portion are formed; the inner diameter N; The taper angle θ of the reduced diameter portion and the radius of curvature R2 of the connecting portion are N ≧ 300 mm, θ ≦ 30 °, and R2 ≧ 20 mm.
このように直胴部の定径部の内径Ｎと、縮径部のテーパ角θと、接続部の曲率半径Ｒ２とをそれぞれ、Ｎ≧３００ｍｍ、θ≦３０°、Ｒ２≧２０ｍｍとすることにより、成形体強度よりも中子と縮径部との密着力が小さくなるため、成形後に中子を引き抜いたに生じる縮径部の割れや欠け等を防止することができる。 In this way, by setting the inner diameter N of the constant diameter portion of the straight body portion, the taper angle θ of the reduced diameter portion, and the curvature radius R2 of the connecting portion to N ≧ 300 mm, θ ≦ 30 °, and R2 ≧ 20 mm, respectively. Since the adhesive force between the core and the reduced diameter portion is smaller than the strength of the molded body, it is possible to prevent cracking or chipping of the reduced diameter portion that occurs when the core is pulled out after molding.
更に、前記スリーブ成形体を焼成あるいは焼結することによって、良好なスリーブを得ることができ、歩留まりを向上させることができる。 Furthermore, by firing or sintering the sleeve molded body, a good sleeve can be obtained and the yield can be improved.
本発明によれば、成形後において中子を引き抜く際に生じる破損を防止し、歩留まりを向上させたスリーブ成形体及びスリーブを得ることができる。 According to the present invention, it is possible to obtain a sleeve molded body and a sleeve that can prevent breakage that occurs when the core is pulled out after molding and improve the yield.
以下、本発明に係るスリーブ成形体及びスリーブにかかる実施形態について図面に基づき説明する。
先ず、図１、図２に基づき本発明に係るスリーブ成形体の第一の実施形態について説明する。図１は本発明に係るスリーブ成形体１の斜視図である。図２はスリーブ成形体１の先端部の断面図である。
Hereinafter, embodiments of a sleeve molded body and a sleeve according to the present invention will be described with reference to the drawings.
First, based on FIG. 1, FIG. 2, 1st embodiment of the sleeve molded object which concerns on this invention is described. FIG. 1 is a perspective view of a sleeve molded
図１に示すスリーブ成形体１は、耐火物（例えば、酸化アルミニウムを主体とするセラミックス）を成形することにより形成される。このスリーブ成形体１は、円筒状の直胴部１ａと、この直胴部１ａの先端に一体形成され円錐台状の頭部１ｂとを有している。この頭部１ｂの先端には開口１ｃが設けられ、前記開口１ｃとスリーブ成形体１の内部空間とを連通する貫通孔１ｈが設けられている。
一方、直胴部１ａの後端には、ブローパイプを兼ねたシャフト（図示せず）を挿入するためのシャフト挿入口１ｄが設けられ、前記シャフト挿入口１ｄ、スリーブ成形体１の内部空間、貫通孔１ｈ、開口１ｃは連通している。
A sleeve molded
On the other hand, the rear end of the straight body portion 1a is provided with a shaft insertion port 1d for inserting a shaft (not shown) that also serves as a blow pipe. The shaft insertion port 1d, the internal space of the sleeve molded
更に、図２の断面図に示すように、スリーブ成形体１の内部空間（内壁）には、内径Ｎが一定な定径部１ｉと、前記直胴部１ａの先端側から前記頭部１ｂ側にかけて、前記定径部１ｉの内径Ｎが漸減縮小する曲率半径Ｒ１の凹曲面状の縮径部１ｅとが形成されている。
Further, as shown in the cross-sectional view of FIG. 2, in the inner space (inner wall) of the sleeve molded
ここで、直胴部１ａの定径部１ｉの内径Ｎと縮径部１ｅにおける曲率半径Ｒ１との関係は、Ｎ≧３００ｍｍ、かつＲ１＞Ｎとなるよう形成されている。
Ｒ１＞Ｎとしたのは、縮径部１ｅにおける曲率半径Ｒ１が内径Ｎ以下となると、縮径部１ｅの先端部分に平面部分（中子の引抜き方向に対して垂直な面）が生じ、縮径部１ｅ内壁と中子との密着力が大きくなる。そして、前記密着力が成形体強度よりも大きくなると、割れや欠けが発生するためである。
また、内径Ｎが大きくなると、縮径部１ｅの先端部分と中子との接触面積が大きくなり、中子と縮径部１ｅとの密着力が成形体強度よりも大きくなる場合もある。特に、縮径部１ｅの先端部分と中子との接触部分が、中子の引抜き方向に対して垂直な面である場合には、中子と縮径部１ｅとの密着力がより大きくなる。
そのため、内径３００ｍｍ以上の場合、縮径部１ｅにおいて漸減縮小する内表面（内壁）の曲率半径Ｒ１を内径よりも大きくすることで（曲率半径Ｒ１は３００ｍｍ以上）、中子と縮径部１ｅとの密着力を小さくし、割れや欠けが発生するおそれを低減したものである。
Here, the relationship between the inner diameter N of the constant diameter portion 1i of the straight body portion 1a and the curvature radius R1 of the reduced diameter portion 1e is formed such that N ≧ 300 mm and R1> N.
The reason why R1> N is set is that when the radius of curvature R1 in the reduced diameter portion 1e is equal to or less than the inner diameter N, a flat portion (a surface perpendicular to the drawing direction of the core) is generated at the distal end portion of the reduced diameter portion 1e. The adhesion between the inner wall of the diameter portion 1e and the core is increased. And when the said contact | adhesion power becomes larger than a molded object strength, it is because a crack and a chip | tip generate | occur | produce.
Further, when the inner diameter N is increased, the contact area between the tip portion of the reduced diameter portion 1e and the core is increased, and the adhesion force between the core and the reduced diameter portion 1e may be larger than the strength of the molded body. In particular, when the contact portion between the tip portion of the reduced diameter portion 1e and the core is a surface perpendicular to the drawing direction of the core, the adhesion force between the core and the reduced diameter portion 1e is increased. .
Therefore, when the inner diameter is 300 mm or more, the radius of curvature R1 of the inner surface (inner wall) that gradually decreases in the reduced diameter portion 1e is made larger than the inner diameter (the curvature radius R1 is 300 mm or more), and the core, the reduced diameter portion 1e, This reduces the risk of cracking and chipping.
次に、本発明に係るスリーブ成形体の第二の実施形態について説明する。尚、第二の実施の形態においては、前記した第一の実施形態とは、その中空部における内表面（内壁）形状のみ異なる。そのため、以下の説明においては、図１及び図３に基づいて説明する。 Next, a second embodiment of the sleeve molded body according to the present invention will be described. In the second embodiment, only the shape of the inner surface (inner wall) in the hollow portion is different from the first embodiment described above. Therefore, in the following description, it demonstrates based on FIG.1 and FIG.3.
図３は、第二の実施の形態におけるスリーブ成形体１の先端部の断面図である。
図３の断面図に示すように、スリーブ成形体１の内部空間（内壁）には、内径Ｎが一定な定径部と、前記直胴部１ａの先端側から前記頭部１ｂ側にかけて、円錐状に漸減縮径する縮径部１ｆが形成されている。
尚、この円錐状の内壁が定径部１ｉの内壁となす角度をテーパ角θという。また、内径Ｎの部分と縮径部１ｆとの接続部１ｇはＲ加工され、凹曲面に形成されている。そして、前記定径部１ｉと縮径部１ｆは滑らかに接続されている。
FIG. 3 is a cross-sectional view of the distal end portion of the sleeve molded
As shown in the cross-sectional view of FIG. 3, the inner space (inner wall) of the sleeve molded
The angle formed by the conical inner wall with the inner wall of the constant diameter portion 1i is referred to as a taper angle θ. Further, a connecting portion 1g between the inner diameter N portion and the reduced diameter portion 1f is R-processed and formed into a concave curved surface. The constant diameter portion 1i and the reduced diameter portion 1f are smoothly connected.
ここで、直胴部１ａの定径部１ｉの内径Ｎと、縮径部１ｆのテーパ角θと、接続部１ｇの曲率半径Ｒ２とはそれぞれ、Ｎ≧３００ｍｍ、θ≦３０°、Ｒ２≧２０ｍｍとなるよう形成されている。
θ≦３０°、Ｒ２≧２０ｍｍという条件を満たす場合には、中子と縮径部１ｅとの密着力を成形体強度よりも小さくすることができ、割れや欠けの発生をする抑制することができる。
Here, the inner diameter N of the constant diameter portion 1i of the straight body portion 1a, the taper angle θ of the reduced diameter portion 1f, and the radius of curvature R2 of the connecting portion 1g are respectively N ≧ 300 mm, θ ≦ 30 °, R2 ≧ 20 mm. It is formed to become.
When the conditions of θ ≦ 30 ° and R2 ≧ 20 mm are satisfied, the adhesion force between the core and the reduced diameter portion 1e can be made smaller than the strength of the molded body, and the generation of cracks and chips can be suppressed. it can.
円錐状に漸減縮径する縮径部１ｆの場合、縮径部１ｅと中子の密着面が斜面となるため、中子引抜き方向の密着力の分力は小さくなる。そして、テーパ角θが３０°以下の場合には、成形体強度よりも中子引抜き方向の密着力の分力が小さくなるため、割れや欠けが防止される。
また、曲率半径Ｒ２が２０ｍｍ未満の場合、接続部１ｇにおいて、成形体強度よりも中子と内壁との密着力が大きく、接続部１ｇに割れや欠け等が発生し易いためである。
In the case of the reduced diameter portion 1f that gradually decreases in diameter in a conical shape, the contact surface between the reduced diameter portion 1e and the core is an inclined surface, so the component force of the close contact force in the core drawing direction is small. And when taper angle (theta) is 30 degrees or less, since the component force of the contact | adhesion power of a core drawing direction becomes smaller than a molded object strength, a crack and a chip | tip are prevented.
In addition, when the radius of curvature R2 is less than 20 mm, in the connection portion 1g, the adhesion between the core and the inner wall is greater than the strength of the molded body, and the connection portion 1g is likely to be cracked or chipped.
このような構成のスリーブ成形体１を製造方法について説明する。
先ず、第一の実施形態にあっては、直胴部１ａにおける定径部１ｉの内径Ｎと縮径部１ｅにおける曲率半径Ｒ１との関係が、Ｎ≧３００ｍｍ、Ｒ１＞Ｎである中子を用意する。
また、第二の実施形態にあっては、直胴部１ａの定径部１ｉの内径Ｎと、縮径部１ｆのテーパ角θと、接続部１ｇの曲率半径Ｒ２とが、Ｎ≧３００ｍｍ、θ≦３０°、Ｒ２≧２０ｍｍである中子を用意する。
尚、前記中子の材質は、石膏である。
A method for manufacturing the sleeve molded
First, in the first embodiment, a core in which the relationship between the inner diameter N of the constant diameter portion 1i in the straight body portion 1a and the curvature radius R1 in the reduced diameter portion 1e is N ≧ 300 mm and R1> N is used. prepare.
In the second embodiment, the inner diameter N of the constant diameter portion 1i of the straight body portion 1a, the taper angle θ of the reduced diameter portion 1f, and the curvature radius R2 of the connecting portion 1g are N ≧ 300 mm, A core satisfying θ ≦ 30 ° and R2 ≧ 20 mm is prepared.
The material of the core is gypsum.
そして、アルミナ（Ａｌ2Ｏ3）を主体とし、シリカ（ＳｉＯ2）および／またはムライト（Ａｌ2Ｏ3?ＳｉＯ2）を所定の配合比率で含む原料粉末を粒度調整して用意する。 A raw material powder containing alumina (Al 2 O 3 ) as a main component and containing silica (SiO 2 ) and / or mullite (Al 2 O 3 —SiO 2 ) at a predetermined blending ratio is prepared by adjusting the particle size.
次いで、前記原料粉末を水に分散させてスラリー状とし、それを中子が配置された鋳型（石膏型等）に鋳込み成形し、硬化状況を確認した後、中子を引き抜き、スリーブ成形体を得る。
ここで、第一の実施形態にかかるスリーブ成形体１にあっては、直胴部１ａにおける定径部１ｉの内径Ｎと縮径部１ｅにおける曲率半径Ｒ１との関係が、Ｎ≧３００ｍｍ、Ｒ１＞Ｎであるため、成形体強度よりも中子と縮径部１ｅとの密着力が小さく、割れや欠け等が生じることなく中子を引き抜くことができる。
また、第二の実施形態にかかるスリーブ成形体１にあっては、直胴部１ａにおける定径部１ｉの内径Ｎが３００ｍｍ以上、テーパ角θが３０°以下、接続部１ｇの曲率半径Ｒ２が２０ｍｍ以上であるため、成形体強度よりも中子と縮径部１ｅとの密着力が小さく、割れや欠け等が生じることなく中子を引き抜くことができる。
Next, the raw material powder is dispersed in water to form a slurry, which is cast into a mold (such as a gypsum mold) in which the core is disposed, and after confirming the curing state, the core is pulled out to form a sleeve molded body. obtain.
Here, in the sleeve molded
Further, in the sleeve molded
そして、前記スリーブ成形体１を乾燥し、大気雰囲気において焼成して焼成体とし、得られた焼成体に対し、外周加工および開口１ｃ、貫通孔１ｈの機械加工を施し、スリーブ１を得る。
Then, the sleeve molded
続いて、本発明に係るスリーブおよびその製造方法について、実施例に基づきさらに説明する。
〔実施例１〕
実施例１では、第一の実施の形態（図２に示した）縮径部１ｅが凹曲面の場合について、内径Ｎと曲率半径Ｒ１の好ましい条件について検証した。
Next, the sleeve and the manufacturing method thereof according to the present invention will be further described based on examples.
[Example 1]
In Example 1, the preferred conditions of the inner diameter N and the radius of curvature R1 were verified when the reduced diameter portion 1e of the first embodiment (shown in FIG. 2) is a concave curved surface.
スリーブ定径部の内径Ｎの条件を１９０ｍｍ、２３０ｍｍ、２５０ｍｍ、３００ｍｍ、３５０ｍｍ、４００ｍｍとし、縮径部１ｅにおける曲率半径Ｒ１の条件を１００ｍｍ、１５０ｍｍ、２００ｍｍ、２５０ｍｍ、２９０ｍｍ、３２０ｍｍ、４００ｍｍ、５００ｍｍ、６００ｍｍとし、表１に示す条件の組み合わせにおいて、それぞれ１０回の施行を行い、スリーブ成形体から中子を取り出し、割れ、欠け等の欠損を調べた。
この実験の結果を前記条件と共に表１に示す。
The conditions of the inner diameter N of the sleeve constant diameter portion are 190 mm, 230 mm, 250 mm, 300 mm, 350 mm, 400 mm, and the condition of the curvature radius R1 in the reduced diameter portion 1e is 100 mm, 150 mm, 200 mm, 250 mm, 290 mm, 320 mm, 400 mm, 500 mm, Each of the combinations of conditions shown in Table 1 was performed 10 times, and the core was taken out from the sleeve molded body and examined for defects such as cracks and chips.
The results of this experiment are shown in Table 1 together with the above conditions.
表１に示すように、スリーブ定径部の内径Ｎは３００ｍｍ以上であって、縮径部の曲率半径Ｒ１が内径Ｎより大きい条件の場合に、１０回の施行中、欠損発生回数は０回であった。 As shown in Table 1, when the inner diameter N of the constant diameter portion of the sleeve is 300 mm or more and the radius of curvature R1 of the reduced diameter portion is larger than the inner diameter N, the number of occurrences of defects is 0 during 10 operations. Met.
〔実施例２〕
実施例２では、第二の実施形（図３に示した）縮径部１ｆが円錐状面（テーパ面）の場合、内径Ｎとテーパ角θおよび接続部１ｇの曲率半径Ｒ２の好ましい条件について検討した。
[Example 2]
In Example 2, when the reduced diameter portion 1f of the second embodiment (shown in FIG. 3) is a conical surface (tapered surface), preferable conditions for the inner diameter N, the taper angle θ, and the radius of curvature R2 of the connecting portion 1g are described. investigated.
スリーブ定径部の内径Ｎの条件を１９０ｍｍ、２３０ｍｍ、２５０ｍｍ、３００ｍｍ、３５０ｍｍ、４００ｍｍとし、テーパ角θの条件を１０°、１５°、２５°、３０°、４０°、５０°とし、接続部１ｇの曲率半径Ｒ２の条件を５ｍｍ、１０ｍｍ、２０ｍｍ、５０ｍｍ、１００ｍｍとし、表２に示す条件の組み合わせにおいて、それぞれ１０回の施行を行い、スリーブ成形体から中子を取り出し、割れ、欠け等の欠損を調べた。
この実験の結果を前記条件と共に表２に示す。
The conditions of the inner diameter N of the sleeve constant-diameter portion are 190 mm, 230 mm, 250 mm, 300 mm, 350 mm, and 400 mm, and the taper angle θ is 10 °, 15 °, 25 °, 30 °, 40 °, and 50 °. The condition of the radius of curvature R2 of 1 g is 5 mm, 10 mm, 20 mm, 50 mm, and 100 mm, and the combination of the conditions shown in Table 2 is performed 10 times, and the core is taken out from the sleeve molded body, and cracks, chips, etc. The defect was examined.
The results of this experiment are shown in Table 2 together with the above conditions.
表２に示すようにスリーブ定径部の内径Ｎは３００ｍｍ以上、テーパ角θは３０°以下、接続部１ｇの曲率半径Ｒ２が２０ｍｍ以上の場合に、欠損は発生しないという結果が得られた。 As shown in Table 2, when the inner diameter N of the sleeve constant-diameter portion is 300 mm or more, the taper angle θ is 30 ° or less, and the radius of curvature R2 of the connecting portion 1g is 20 mm or more, the result that no defect occurs is obtained.
以上の実施例の実験結果から、本発明によれば、成形後、中子を引き抜いても破損を生じさせることなく、歩留まりを向上できることを確認できた。 From the experimental results of the above examples, according to the present invention, it was confirmed that the yield could be improved without causing damage even if the core was pulled out after molding.
１ スリーブ成形体
１ａ 直胴部
１ｂ 頭部
１ｃ 開口
１ｄ シャフト挿入孔
１ｅ 縮径部
１ｆ 縮径部
１ｇ 接続部
１ｈ 貫通孔
１ｉ 定径部
Ｎ 内径
Ｒ１ 曲率半径
Ｒ２ 曲率半径
θ テーパ角
DESCRIPTION OF
Claims (3)
前記直胴部の内壁には、内径は一定な定径部と、前記直胴部の先端側から前記頭部側にかけて、前記内径が漸減縮小する凹曲面状の縮径部が形成され、
前記直胴部の前記内径Ｎと前記縮径部の曲率半径Ｒ１との関係が、Ｎ≧３００ｍｍ、かつＲ１＞Ｎであることを特徴とするスリーブ成形体。 A cylindrical straight body portion and a truncated cone-shaped head portion formed at a tip of the straight body portion, and an opening communicating with the internal space of the straight body portion is formed in the truncated cone-shaped head portion. In a sleeve molded body made of refractory,
On the inner wall of the straight body part, a constant diameter part having a constant inner diameter, and a concave-curved reduced diameter part in which the inner diameter gradually decreases from the tip side of the straight body part to the head side, are formed.
A sleeve molded body characterized in that the relationship between the inner diameter N of the straight body portion and the radius of curvature R1 of the reduced diameter portion is N ≧ 300 mm and R1> N.
前記直胴部の内壁には、内径は一定な定径部と、前記直胴部の先端側から前記頭部側にかけて、前記内径が漸減縮小するテーパ状の縮径部と、前記定径部と縮径部とを接続する接続部とが形成され、
前記内径Ｎと、前記縮径部のテーパ角θと、前記接続部の曲率半径Ｒ２が、Ｎ≧３００ｍｍ、θ≦３０°、Ｒ２≧２０ｍｍであることを特徴とするスリーブ成形体。 A cylindrical straight body portion and a truncated cone-shaped head portion formed at a tip of the straight body portion, and an opening communicating with the internal space of the straight body portion is formed in the truncated cone-shaped head portion. In a sleeve molded body made of refractory,
The inner wall of the straight body portion has a constant diameter portion having a constant inner diameter, a tapered diameter-reducing portion in which the inner diameter gradually decreases from the front end side to the head side of the straight body portion, and the constant diameter portion And a connecting portion that connects the reduced diameter portion,
The sleeve molded body characterized in that the inner diameter N, the taper angle θ of the reduced diameter portion, and the radius of curvature R2 of the connecting portion are N ≧ 300 mm, θ ≦ 30 °, and R2 ≧ 20 mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54118413A (en) * | 1978-03-08 | 1979-09-13 | Tokyo Shibaura Electric Co | Sleeve fixing device |
| JPH0747518A (en) * | 1993-08-06 | 1995-02-21 | Miyagawa Kasei Ind Co Ltd | Production of ceramic hollow product |
| JPH11180724A (en) * | 1997-12-17 | 1999-07-06 | Nippon Electric Glass Co Ltd | Sleeve for forming glass tube |
| JP2007131473A (en) * | 2005-11-09 | 2007-05-31 | Asahi Glass Co Ltd | Cylinder tube for molding molten glass and manufacture method of glass tube |
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2008
- 2008-03-31 JP JP2008092433A patent/JP4945498B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54118413A (en) * | 1978-03-08 | 1979-09-13 | Tokyo Shibaura Electric Co | Sleeve fixing device |
| JPH0747518A (en) * | 1993-08-06 | 1995-02-21 | Miyagawa Kasei Ind Co Ltd | Production of ceramic hollow product |
| JPH11180724A (en) * | 1997-12-17 | 1999-07-06 | Nippon Electric Glass Co Ltd | Sleeve for forming glass tube |
| JP2007131473A (en) * | 2005-11-09 | 2007-05-31 | Asahi Glass Co Ltd | Cylinder tube for molding molten glass and manufacture method of glass tube |
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