JPH0617004B2 - Extrusion molding method and apparatus for ceramic honeycomb structure - Google Patents
Extrusion molding method and apparatus for ceramic honeycomb structureInfo
- Publication number
- JPH0617004B2 JPH0617004B2 JP62178476A JP17847687A JPH0617004B2 JP H0617004 B2 JPH0617004 B2 JP H0617004B2 JP 62178476 A JP62178476 A JP 62178476A JP 17847687 A JP17847687 A JP 17847687A JP H0617004 B2 JPH0617004 B2 JP H0617004B2
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb
- extrusion
- extruded
- ceramic compound
- boss
- 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 28
- 238000001125 extrusion Methods 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 9
- 238000000465 moulding Methods 0.000 claims description 23
- 150000001875 compounds Chemical class 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000004898 kneading Methods 0.000 claims description 2
- 241000264877 Hippospongia communis Species 0.000 description 34
- 239000002184 metal Substances 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 19
- 230000001174 ascending effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はセラミックからなる過給機用ロータ等のハニカ
ム構造体の成形方法とその装置に関する。Description: TECHNICAL FIELD The present invention relates to a method for forming a honeycomb structure made of ceramics such as a rotor for a supercharger and an apparatus therefor.
（従来の技術） セラミックは金属に比べ軽量で腐食しにくい特性を有し
ているため、過給機用ロータセル、排気ガス浄化用の触
媒担体、熱交換器等の複数の隔壁によって区切られたハ
ニカム構造体がセラミックにより形成されている。(Prior art) Since ceramics are lighter in weight and less corrosive than metals, honeycombs separated by a plurality of partition walls, such as a supercharger rotor cell, an exhaust gas purification catalyst carrier, and a heat exchanger. The structure is made of ceramic.
斯かるセラミックハニカム構造体の製造は流動性のある
セラミックコンパウンドをスクリューにて加工混練し、
この加圧したセラミックコンパウンドを成形ヘッドの金
型から押出し、所定寸法に切断した後乾燥し、次いで焼
成するようにしている。Such a ceramic honeycomb structure is manufactured by kneading a fluid ceramic compound with a screw,
The pressurized ceramic compound is extruded from a mold of a molding head, cut into a predetermined size, dried, and then fired.
しかしながら押出し成形によってハニカム構造体を成形
する場合、例えば隔壁の肉厚が異なると特公昭６２−２
０８８１号等に開示されるように金型自体に工夫をこら
す必要がある。However, when a honeycomb structure is formed by extrusion molding, for example, if the wall thickness of the partition walls is different, the Japanese Patent Publication No. 62-2 is used.
It is necessary to devise the mold itself as disclosed in No. 0881 and the like.
（発明が解決しようとする問題点） 従来の押出し成形法にあっては、スクリューを横置きに
セットする関係から側方に成形品を押出すようにしてい
る。このため、成形品に歪み、撓みが生じ、過給機のロ
ータの如き回転部品としては使用に耐え得るものを生産
することができない。(Problems to be Solved by the Invention) In the conventional extrusion molding method, a molded product is extruded laterally because of the setting of the screw horizontally. For this reason, the molded product is distorted and bent, and it is impossible to produce a rotating component such as a rotor of a supercharger that can be used.
一方、プラスチック製品にあっては、成形ヘッドから下
方へ押出す方法があるが、この方法をセラミックハニカ
ム構造体に適用すると、押出された後のセラミックコン
パウンドが自重により伸び、厚みが薄くなるという問題
がある。On the other hand, for plastic products, there is a method of extruding downward from the molding head, but if this method is applied to a ceramic honeycomb structure, the ceramic compound after extrusion will expand due to its own weight and the thickness will become thin. There is.
いずれの場合も所望の形状は得られない。In either case, the desired shape cannot be obtained.
（問題点を解決するための手段） 上記問題点を解決すべく本発明は、セラミックコンパウ
ンドを加圧混練しつつスクリューで成形ヘッドへ送り込
み、セラミックコンパウンドの押出し方向を鉛直上向き
とし、成形ヘッドからの押出しは外側のハニカム部と、
このハニカム部内周面に接触する内側のボス部に分けて
行い、ボス部の押出し速度をハニカム部の押出し速度に
合せるようにした。(Means for Solving the Problems) In order to solve the above problems, the present invention is to press and knead the ceramic compound and send it to the molding head with a screw, and the extrusion direction of the ceramic compound is vertically upward, Extrusion is with the outer honeycomb part,
The inner boss portion that contacts the inner peripheral surface of the honeycomb portion was divided into pieces, and the extrusion speed of the boss portion was adjusted to match the extrusion speed of the honeycomb portion.
また、成形ヘッド内を、ハニカム部を成形する外側流路
と、押出しの際にハニカム部内周面に接触するボス部を
成形する内側流路とに区画した。Further, the inside of the molding head was divided into an outer flow path for molding the honeycomb portion and an inner flow path for molding the boss portion that comes into contact with the inner peripheral surface of the honeycomb portion during extrusion.
更に、内側流路内には芯金を立設し、この芯金にはボス
部の押出しとともに一体的に上昇するガイド部材を係合
した。Further, a cored bar is provided upright in the inner flow path, and a guide member that integrally rises as the boss is pushed out is engaged with the cored bar.
（作用） スクリューによって加圧混練されたセラミックコンパウ
ンドは成形ヘッド下方においてその流動方向が上向きに
なり、成形ヘッド上端に取付けた金型を介してハニカム
状に押出される。また、外側のハニカム部を押出すにあ
たり、その内側のボス部が圧着同調して押出される。(Operation) The ceramic compound kneaded under pressure by the screw has a flow direction that is upward below the molding head and is extruded in a honeycomb shape through a mold attached to the upper end of the molding head. Further, when the honeycomb portion on the outer side is extruded, the boss portion on the inner side thereof is extruded in synchronization with the pressure bonding.
このボス部はガイド部材とともに上昇して押出される。The boss portion is lifted and extruded together with the guide member.
ハニカム部は上方へ押出される際に、その内周面がボス
部の外周面に圧着される。When the honeycomb portion is pushed upward, the inner peripheral surface thereof is pressed against the outer peripheral surface of the boss portion.
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Below, the Example of this invention is described based on an accompanying drawing.
第１図は本発明に係る押出し成形装置の成形ヘッド断面
図である。FIG. 1 is a sectional view of a molding head of an extrusion molding apparatus according to the present invention.
成形ヘッドの下部は筒状金属ブロック１にて構成され、
この金属ブロック１の側端開口は蓋体２にて閉塞され、
また金属ブロック１内には下方から調整芯３が挿入さ
れ、この調整芯３は金属ブロック１に螺合せしめるとと
もに金属ブロック１よりも下方に突出した調整芯３下端
にハンドル４を取付け、ハンドル４を回転操作すること
で、調整芯３が上下動するようにしている。The lower part of the molding head is composed of a tubular metal block 1,
The side end opening of this metal block 1 is closed by a lid body 2,
An adjusting lead 3 is inserted from below into the metal block 1. The adjusting lead 3 is screwed into the metal block 1 and a handle 4 is attached to the lower end of the adjusting lead 3 protruding below the metal block 1 to attach the handle 4 to the handle 4. The adjustment core 3 is moved up and down by rotating.
一方、成形ヘッドの上部には外側均圧管５及び内側均圧
管６が設けられ、外側均圧管５と内側均圧管６との間を
製品となるハニカム部を成形するための外側流路Ｐ１、
内側均圧管６の内方をハニカム部内周面に接触するボス
部を成形するための内側流路Ｐ２としている。On the other hand, an outer pressure-equalizing pipe 5 and an inner pressure-equalizing pipe 6 are provided on the upper part of the molding head, and an outer flow path P1 for molding a honeycomb portion to be a product is provided between the outer pressure-equalizing pipe 5 and the inner pressure-equalizing pipe 6.
The inner side of the inner pressure equalizing pipe 6 serves as an inner flow path P2 for forming a boss portion that contacts the inner peripheral surface of the honeycomb portion.
また、外側均圧管５の上下端にはフランジが形成され、
下のフランジと金属ブロック１上面との間で多孔板７を
挟持している。多孔板７には第２図に示すようにセラミ
ックコンパウンドが通過する孔８…が複数形成されてい
る。そしてこれら孔のうち流量が多くなる部分つまりス
クリュー９に近い部分に形成した孔８ａの径は流量が少
くなる部分つまりスクリューから遠い部分に形成した孔
８ｂの径よりも小さくし、成形ヘッド上端に設けた金型
１０全面に均等な流量でセラミックコンパウンドが押出
されるようにしている。従って、セラミックコンパウン
ドの流れの方向が大きく変化しても、安定した形状の成
形品を得ることができる。Further, flanges are formed on the upper and lower ends of the outer pressure equalizing pipe 5,
The perforated plate 7 is sandwiched between the lower flange and the upper surface of the metal block 1. As shown in FIG. 2, the porous plate 7 is provided with a plurality of holes 8 through which the ceramic compound passes. The diameter of the hole 8a formed in the portion where the flow rate is large, that is, the portion close to the screw 9 is smaller than the diameter of the hole 8b formed in the portion where the flow rate is small, that is, the portion far from the screw, and the upper end of the molding head is formed. The ceramic compound is extruded on the entire surface of the provided die 10 at a uniform flow rate. Therefore, it is possible to obtain a molded product having a stable shape even if the flow direction of the ceramic compound is largely changed.
また、多孔板７の中央には筒状部１１を形成し、この筒
状部１１下方に前記調整芯３の上端を臨ませ、ハンドル
４の操作で調整芯３を上下動させることで内側流路Ｐ２
への流量を変化させる。更に筒状部１１の上半部には中
子ダイス１２を螺着し、この中子ダイス１２に前記内側
均圧管６の下端を螺着し、内側均圧管６の上端を金型１
０内周面に係着せしめている。Further, a tubular portion 11 is formed in the center of the perforated plate 7, the upper end of the adjustment core 3 is exposed below the tubular portion 11, and the handle 4 is operated to move the adjustment core 3 up and down to cause an inward flow. Road P2
Vary the flow rate to. Further, a core die 12 is screwed onto the upper half of the tubular portion 11, the lower end of the inner pressure equalizing pipe 6 is screwed onto the core die 12, and the upper end of the inner pressure equalizing pipe 6 is attached to the mold 1.
0 It is attached to the inner peripheral surface.
ここで金型１０は平面図である第３図にも示すようにハ
ニカム部を成形するための内側部１０ａと製品の外周部
を成形するための外輪１０ｂとからなり、この外輪１０
ｂは金型１０の固定金具１３に径方向に挿入した調整ボ
ルト１４の内端に当接している。而して調整ボルト１４
を締めたり或いは緩めたりすることで外輪１０ｂは径方
向にずれ、製品外周部の肉厚が調整される。As shown in FIG. 3, which is a plan view, the mold 10 is composed of an inner part 10a for molding the honeycomb part and an outer ring 10b for molding the outer peripheral part of the product.
b is in contact with the inner end of the adjusting bolt 14 which is inserted into the fixing metal fitting 13 of the mold 10 in the radial direction. Therefore, adjusting bolt 14
By tightening or loosening, the outer ring 10b is displaced in the radial direction, and the wall thickness of the outer peripheral portion of the product is adjusted.
更に、前記内側均圧管６内には上方から芯金１５を挿入
している。芯金１５は大径の下芯金１５ａと小径の上芯
金１５ｂとからなり、下芯金１５ａはその下端が前記多
孔板７の中央に固着され、上芯金１５ｂは下芯金１５ａ
と連結部材１６を介して下芯金１５ａに着脱可能に連結
され、更に上芯金１５ｂにはフランジ部を有するガイド
部材１７が摺動自在に外嵌されている。Further, a cored bar 15 is inserted into the inner pressure equalizing pipe 6 from above. The core metal 15 is composed of a large-diameter lower core metal 15a and a small-diameter upper core metal 15b, the lower end of the lower core metal 15a is fixed to the center of the porous plate 7, and the upper core metal 15b is the lower core metal 15a.
And a guide member 17 having a flange portion are slidably fitted on the upper core metal 15b.
以上の如き構成からなる成形装置を用いて過給機ロータ
の如きハニカム構造体を成形する方法を以下に述べる。A method of forming a honeycomb structure such as a supercharger rotor using the forming apparatus having the above-described structure will be described below.
セラミックコンパウンドはスクリュー９によって加圧混
練され、金属ブロック１内においてその流動方向を上方
に変化し、その一部は多孔板７の孔８を介して外側流路
Ｐ１に入り、残りは調整芯３と多孔板７の筒状部１１の
隙間を通って内側流路Ｐ２に入る。The ceramic compound is kneaded under pressure by the screw 9, its flow direction is changed upward in the metal block 1, a part of it enters the outer flow path P1 through the holes 8 of the perforated plate 7, and the rest is the adjusting core 3 And through the gap between the cylindrical portion 11 of the perforated plate 7 and the inside flow path P2.
外側流路Ｐ１に入ったセラミックコンパウンドは順次上
方へ押し上げられ、金型１０を通過することで第４図に
示すようにハニカム部Ｗ１として上方へ押出される。一
方内側流路Ｐ２に入ったセラミックコンパウンドはボス
部Ｗ２として上方へ押出される。ここでボス部Ｗ２は上
方へ押出される際にガイド部材１７とともに上昇し、こ
のガイド部材１７は上芯金１５ｂに外嵌しているため、
ボス部Ｗ２が上昇するときにボス部Ｗ２にねじれ、倒れ
等が生じることがない。そして、ハニカム部Ｗ１につい
ては、上方へ押出される際にその内周面がボス部Ｗ２外
周面に圧着し、ボス部Ｗ２によってハニカム部Ｗ１のね
じれ、倒れ等が防止できる。この圧着は、下芯金１５ａ
の径よりも外径の大きな連結部材１６を、第１図に示す
位置に設置することにより、ボス部に生じた、径方向外
向きの圧力に起因する。The ceramic compound that has entered the outer flow path P1 is sequentially pushed upward and passes through the mold 10 to be extruded upward as a honeycomb portion W1 as shown in FIG. On the other hand, the ceramic compound that has entered the inner flow path P2 is extruded upward as the boss portion W2. Here, the boss portion W2 rises together with the guide member 17 when it is pushed upward, and since the guide member 17 is externally fitted to the upper core metal 15b,
When the boss W2 rises, the boss W2 will not be twisted or fallen. The inner peripheral surface of the honeycomb portion W1 is pressed against the outer peripheral surface of the boss portion W2 when the honeycomb portion W1 is extruded upward, so that the boss portion W2 can prevent the honeycomb portion W1 from twisting, falling, and the like. This crimping is performed with the lower core metal 15a.
When the connecting member 16 having an outer diameter larger than the diameter is installed at the position shown in FIG. 1, it is caused by the radially outward pressure generated in the boss portion.
尚、ハニカム部Ｗ１の変形を有効に防止するにはハニカ
ム部Ｗ１の上昇速度とボス部Ｗ２の上昇速度が略々通し
いことが要求される。この上昇速度を調整するにはハン
ドル４を操作して内側流路Ｐ２へのセラミックコンパウ
ンドの流入量をコントロールすればよい。In order to effectively prevent the deformation of the honeycomb part W1, it is required that the ascending speed of the honeycomb part W1 and the ascending speed of the boss part W2 are almost the same. To adjust the rising speed, the handle 4 may be operated to control the inflow amount of the ceramic compound into the inner flow path P2.
以上の如くしてハニカム部Ｗ１とボス部Ｗ２を所定の長
さまで押出したならば、上芯金１５ｂを引き抜きピアノ
線等によりハニカム部Ｗ１とボス部Ｗ２を径方向に切断
し、これを例えばマイクロ波により乾燥せしめる。これ
に加工を施した後、焼成し目的とする過給機用ロータ等
の製品とする。After the honeycomb portion W1 and the boss portion W2 are extruded to a predetermined length as described above, the upper core metal 15b is pulled out and the honeycomb portion W1 and the boss portion W2 are radially cut by a piano wire or the like, and this is cut with, for example, a micro Dry by waves. After this is processed, it is fired to obtain a desired product such as a rotor for a supercharger.
（発明の効果） 以上の発明は以下の如き効果を発揮する。(Effects of the Invention) The above invention exhibits the following effects.
先ず、セラミックハニカム構造体を押出し成形するにあ
たり、セラミックコンパウンドを鉛直上向きに押出すよ
うにしたので、成形体の径方向の歪み、撓み、及び押出
し方向の伸びを抑制できる。また同時に自重による密度
の向上も図れる。First, when the ceramic honeycomb structure is extruded and molded, the ceramic compound is extruded vertically upward, so that it is possible to suppress radial distortion, bending, and elongation in the extruding direction of the molded body. At the same time, the density can be improved due to its own weight.
また、ハニカム部を押出すにあたり、その内側にボス部
を圧着同調して押出すようにしたので、単にハニカム部
を押出す場合に比べ、ハニカム部の歪み、撓み、等の変
形を有効に防止することができる。In addition, when the honeycomb part is extruded, the boss part is pressed in synchronization with the inside of the extruded part so that the honeycomb part is effectively prevented from being deformed such as distortion, bending, etc. as compared with the case of simply extruding the honeycomb part. can do.
更に、成形ヘッド内が、ハニカム部を成形する外側流路
と、押出しの際にハニカム部内周面に接触するボス部を
形成する内側流路とに区画されているので、ハニカム部
が上方へ押出される際にその内周面がボス部の外周面に
圧着し、ボス部によってハニカム部のねじれや倒れ等を
防止できる。Furthermore, since the inside of the molding head is partitioned into an outer flow path for molding the honeycomb portion and an inner flow path for forming a boss portion that contacts the inner peripheral surface of the honeycomb portion during extrusion, the honeycomb portion is extruded upward. The inner peripheral surface of the boss portion is pressed against the outer peripheral surface of the boss portion when the boss portion is pressed, so that the boss portion can prevent the honeycomb portion from being twisted or collapsed.
更にまた、内側流路内に芯金が立設され、この芯金に
は、ボス部の押出しとともに一体的に上昇するガイド部
材が係合しているので、ボス部はガイド部材とともに上
昇して押出されるため、ねじれや倒れ等を防止される。Furthermore, a cored bar is erected in the inner channel, and a guide member that integrally rises as the boss is pushed out is engaged with the cored bar, so the boss is raised together with the guide member. Since it is extruded, twisting, falling, etc. are prevented.
第１図は本発明に係る押出し成形装置の成形ヘッドの断
面図、第２図は多孔板の平面図、第３図は金型の平面
図、第４図は成形過程を説明した断面図である。 尚、図面中、３は調整芯、５は外側均圧管、６は内側均
圧管、７は多孔板、９はスクリュー、１０は金型、１５
は芯金、１７はガイド部材、Ｐ１は外側流路、Ｐ２は内
側流路、Ｗ１はハニカム部、Ｗ２はボス部である。1 is a sectional view of a molding head of an extrusion molding apparatus according to the present invention, FIG. 2 is a plan view of a perforated plate, FIG. 3 is a plan view of a mold, and FIG. 4 is a sectional view illustrating a molding process. is there. In the drawings, 3 is an adjusting core, 5 is an outer pressure equalizing pipe, 6 is an inner pressure equalizing pipe, 7 is a perforated plate, 9 is a screw, 10 is a mold, and 15
Is a core bar, 17 is a guide member, P1 is an outer flow path, P2 is an inner flow path, W1 is a honeycomb portion, and W2 is a boss portion.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮崎 哲也 佐賀県鹿島市大字高津原1195−１ (72)発明者 山口 広司 佐賀県藤津郡塩田町冬野甲1088 (56)参考文献 特開 昭58−197008（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Miyazaki 1195-1 Takatsuhara, Kashima-shi, Saga Prefecture (72) Inventor Koji Yamaguchi 1088 Fuyukou, Shioda-machi, Fujitsu-gun, Saga (56) References JP-A-58- 197008 (JP, A)
Claims (3)
って加圧し、この加圧されたセラミックコンパウンドを
成形ヘッドからハニカム状に押出すようにした成形方法
において、前記セラミックコンパウンドの押出し方向は
鉛直上向きとし、前記成形ヘッドからの押出しは外側の
ハニカム部と、このハニカム部内周面に接触する内側の
ボス部に分けて行い、ボス部の押出し速度をハニカム部
の押出し速度に合せるようにしたことを特徴とするセラ
ミックハニカム構造体の押出し成形方法。1. A molding method in which a ceramic compound is pressed by a screw and the pressed ceramic compound is extruded into a honeycomb shape from a molding head, wherein the ceramic compound is extruded in a vertically upward direction. Is extruded separately for the outer honeycomb portion and the inner boss portion that contacts the inner peripheral surface of the honeycomb portion, and the extrusion speed of the boss portion is adapted to match the extrusion speed of the honeycomb portion. Extrusion molding method for a structure.
クリューと、加圧されたセラミックコンパウンドをハニ
カム状に押出す金型を取付けた成形ヘッドを備える押出
し成形装置において、前記成形ヘッド内は、ハニカム部
を成形する外側流路と、押出しの際にハニカム部内周面
に接触するボス部を形成する内側流路とに区画されてい
ること特徴とするセラミックハニカム構造体の押出し成
形装置。2. An extrusion molding apparatus equipped with a screw for kneading a ceramic compound under pressure, and a molding head equipped with a mold for extruding a pressurized ceramic compound into a honeycomb shape, wherein a honeycomb portion is formed in the molding head. An extrusion molding apparatus for a ceramic honeycomb structure, characterized in that it is divided into an outer flow channel to be molded and an inner flow channel that forms a boss portion that comes into contact with the inner peripheral surface of the honeycomb portion during extrusion.
芯金にはボス部の押出しとともに一体的に上昇するガイ
ド部材が係合していることを特徴とする特許請求の範囲
第２項記載のセラミックハニカム構造体の押出し成形装
置。3. A cored bar is provided upright in the inner flow path, and a guide member that integrally rises with the pushing out of the boss is engaged with the cored bar. An extrusion molding apparatus for a ceramic honeycomb structure according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62178476A JPH0617004B2 (en) | 1987-07-16 | 1987-07-16 | Extrusion molding method and apparatus for ceramic honeycomb structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62178476A JPH0617004B2 (en) | 1987-07-16 | 1987-07-16 | Extrusion molding method and apparatus for ceramic honeycomb structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6422504A JPS6422504A (en) | 1989-01-25 |
| JPH0617004B2 true JPH0617004B2 (en) | 1994-03-09 |
Family
ID=16049160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62178476A Expired - Lifetime JPH0617004B2 (en) | 1987-07-16 | 1987-07-16 | Extrusion molding method and apparatus for ceramic honeycomb structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617004B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11233807B2 (en) | 2018-04-06 | 2022-01-25 | Fujitsu Limited | Effective detection of a communication apparatus performing an abnormal communication |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5552102A (en) * | 1994-12-16 | 1996-09-03 | Corning Incorporated | Method and apparatus for extruding large honeycombs |
| KR100278769B1 (en) * | 1996-04-18 | 2001-02-01 | 모리시타 요이찌 | Cathode ray tube and its manufacturing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58197008A (en) * | 1982-05-11 | 1983-11-16 | 株式会社イナックス | Structure of discharge pipe of extrusion molding device |
| JPS6176320A (en) * | 1984-09-25 | 1986-04-18 | 株式会社アスク | Manufacture of hydraulic inorganic extrusion molded shape |
-
1987
- 1987-07-16 JP JP62178476A patent/JPH0617004B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11233807B2 (en) | 2018-04-06 | 2022-01-25 | Fujitsu Limited | Effective detection of a communication apparatus performing an abnormal communication |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6422504A (en) | 1989-01-25 |
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