JPH0470125B2 - - Google Patents

Info

Publication number
JPH0470125B2
JPH0470125B2 JP6027489A JP6027489A JPH0470125B2 JP H0470125 B2 JPH0470125 B2 JP H0470125B2 JP 6027489 A JP6027489 A JP 6027489A JP 6027489 A JP6027489 A JP 6027489A JP H0470125 B2 JPH0470125 B2 JP H0470125B2
Authority
JP
Japan
Prior art keywords
inner diameter
sink
extrusion
drum
extruder
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
Application number
JP6027489A
Other languages
Japanese (ja)
Other versions
JPH02238906A (en
Inventor
Yutaka Inoe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to JP6027489A priority Critical patent/JPH02238906A/en
Publication of JPH02238906A publication Critical patent/JPH02238906A/en
Publication of JPH0470125B2 publication Critical patent/JPH0470125B2/ja
Granted legal-status Critical Current

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  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は中空碍子のような中空セラミツクス体
を押出成形するために使用される押出機に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an extruder used for extrusion molding a hollow ceramic body such as a hollow insulator.

(従来の技術) 上記のような中空セラミツクス体を押出成形す
るには、押出ドラムの内部に流し金と呼ばれる内
径成形用の棒状金具を取付けた押出機が用いられ
ている。この流し金は基端がスクリユー軸の先端
に取付けられ、その先端は押出ドラムの先端の口
金の内部に達するものであつて、径に比較して長
さが極めて長い棒状体であり、スクリユー軸によ
つて押出される坏土の流れの中に支持され、その
周囲の圧力バランスによつて押出ドラムの中心に
位置するものである。ところがこのような棒状の
流し金は押出推力によつて位置がずれて中空体が
偏肉となることがあり、特に内径の大きい製品を
成形するための流し金の径を大きくした場合に流
し金に作用する抵抗が大きくなり、偏肉を生じ易
い欠点があつた。そこで流し金の形状や材質を変
えてその剛性を高めることにより位置ずれを防止
する試みもなされたが、好ましい効果が得られな
かつた。
(Prior Art) In order to extrude the hollow ceramic body as described above, an extruder is used in which an extrusion drum is equipped with a rod-shaped fitting for forming the inner diameter called a sink metal inside the extrusion drum. This sink is a rod-shaped body whose base end is attached to the tip of the screw shaft, and whose tip reaches the inside of the mouthpiece at the tip of the extrusion drum. It is supported in the flow of clay extruded by the drum, and is located at the center of the extrusion drum due to the pressure balance around it. However, such a rod-shaped sinker may be misaligned due to extrusion thrust, resulting in uneven thickness of the hollow body, especially when the diameter of the sinker is increased to mold a product with a large inner diameter. This has the disadvantage that the resistance acting on the material becomes large and uneven thickness tends to occur. Attempts have been made to prevent the misalignment by changing the shape and material of the sink metal to increase its rigidity, but no desired effect has been achieved.

(発明が解決しようとする課題) 本発明はこのような従来の問題を解決して、内
径の小さい中空セラミツクス製品を正確に押出成
形できることは勿論、内径の大きい中空セラミツ
クス製品を成形する場合にも偏肉が生じるおそれ
のない押出機を提供するために完成されたもので
ある。
(Problems to be Solved by the Invention) The present invention solves these conventional problems and not only enables accurate extrusion molding of hollow ceramic products with a small inner diameter, but also enables extrusion molding of hollow ceramic products with a large inner diameter. This was completed in order to provide an extruder that does not cause uneven thickness.

(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
は、坏土押出用の二次軸の先端に内径成形用の流
し金を取付けた押出機において、流し金が複数個
に分解された部分からなり、各部分の相互間がユ
ニバーサルジヨイントにより屈曲自在に連結され
たものであることを特徴とするものである。
(Means for Solving the Problems) The present invention, which has been made to solve the above problems, provides an extruder in which a sink for inner diameter forming is attached to the tip of a secondary shaft for extruding clay. It is characterized in that it consists of a plurality of disassembled parts, and each part is connected to each other in a flexible manner by a universal joint.

(実施例) 以下に本発明を図示の実施例によつて更に詳細
に説明する。
(Example) The present invention will be described in more detail below with reference to illustrated examples.

第1図において、1はホツパー2から投入され
た坏土を押出すためのスクリユー軸の一次軸、3
は坏土中からガスや空気を排除するための真空
室、4は脱気された坏土を押出成形するためのス
クリユー型の二次軸、5は押出ドラムである。押
出ドラム5は大径製品を押出成形する場合には図
示のように先端を次第に拡径させておくものとす
る。
In Fig. 1, 1 is the primary shaft of the screw shaft for pushing out the clay charged from the hopper 2;
Reference numeral 4 indicates a vacuum chamber for removing gas and air from the clay, numeral 4 indicates a screw-type secondary shaft for extruding the degassed clay, and numeral 5 indicates an extrusion drum. When extrusion molding a large-diameter product, the extrusion drum 5 has its tip gradually expanded in diameter as shown in the figure.

6はこの押出ドラム5の内部に設けられる流し
金であり、その基端7は従来のものと同様に二次
軸4の先端に取付けられている。本発明において
は、この流し金6は従来のように一体型のもので
はなく、複数個の部分8,9,10に分割されて
いる。そして部分8,9間、9,10間はそれぞ
れユニバーサルジヨイント11,12につて屈曲
自在に連結されている。ユニバーサルジヨイント
11,12は互いに垂直な2本のピンを介して2
つの部材を接続するために常用される機構であつ
て、本発明においては流し金6の複数個の部分
8,9,10を任意の方向に屈曲自在に連結する
ことができるものであれば、任意の型式のユニバ
ーサルジヨイントを用いることができる。なお先
端の部分10には内径口金13がボルト14によ
つて取付けられている。この内径口金13は中空
製品の内径を正確に成形するためのものであつ
て、部分10から突設された取付軸15にねじ込
まれるボルト14により、押え金具16を介して
固定されている。このような構造としておけば、
成形しようとする中空製品の内径に合わせて内径
口金13のみを容易に交換することができるが、
先端の部分10と内径口金13とが一体化したも
のを用いてもよいことは言うまでもない。
Reference numeral 6 denotes a sink provided inside this extrusion drum 5, and its base end 7 is attached to the tip of the secondary shaft 4 as in the conventional one. In the present invention, the sink 6 is not integrally formed as in the past, but is divided into a plurality of parts 8, 9, and 10. The portions 8 and 9 and the portions 9 and 10 are connected in a flexible manner by universal joints 11 and 12, respectively. Universal joints 11 and 12 are connected to each other via two pins perpendicular to each other.
It is a mechanism commonly used for connecting two members, and in the present invention, as long as it is possible to connect the plurality of parts 8, 9, 10 of the sink metal 6 in any direction, Any type of universal joint can be used. Note that an inner diameter cap 13 is attached to the tip portion 10 with a bolt 14. This inner diameter cap 13 is used to accurately shape the inner diameter of a hollow product, and is fixed via a presser fitting 16 by a bolt 14 screwed into a mounting shaft 15 protruding from the portion 10. If you have a structure like this,
Although only the inner diameter cap 13 can be easily replaced according to the inner diameter of the hollow product to be molded,
It goes without saying that a device in which the tip portion 10 and the inner diameter cap 13 are integrated may be used.

(作 用) このように構成されたものは、従来の押出機と
同様に真空室3において脱気された坏土を二次軸
4によつて押出ドラム5の内部から押出し、外径
が押出ドラム5の内径に等しく、内径が流し金6
の内径口金13の外径に等しい中空セラミツクス
製品を押出成形するものである。しかし本発明に
おいては、従来のものとは異なり流し金6が複数
個の部分8,9,10に分割されて相互にユニバ
ーサルジヨイントで屈曲自在に連結されているた
め、流し金6は各部分が周囲の圧力分布に応じて
自由に押出ドラム5内で押出ドラム5の軸線に対
して垂直方向に動くことができる。この結果、従
来の常識に反して、流し金6の先端の部分10及
び内径口金13は却つて正しく押出ドラム5の中
心に位置することになり、押出された中空製品に
偏肉が発生することが確実に防止される。この理
由は、押出ドラム5内で発生する圧力のアンバラ
ンスが流し金6の途中の部分の動きによつて吸収
されてしまい、先端の部分10に変位を生じさせ
ないためであると考えられる。
(Function) As in the conventional extruder, the extruder extrudes degassed clay in the vacuum chamber 3 from the inside of the extrusion drum 5 by means of the secondary shaft 4. The inner diameter of the drum 5 is equal to that of the sink metal 6.
A hollow ceramic product having an outer diameter equal to the inner diameter of the die 13 is extruded. However, in the present invention, unlike the conventional one, the sink metal 6 is divided into a plurality of parts 8, 9, and 10 and are connected to each other with a universal joint so that each part can be bent. can move freely within the extrusion drum 5 in a direction perpendicular to the axis of the extrusion drum 5 depending on the surrounding pressure distribution. As a result, contrary to conventional common sense, the tip portion 10 of the sinker 6 and the inner diameter mouthpiece 13 are incorrectly positioned at the center of the extrusion drum 5, causing uneven thickness in the extruded hollow product. is definitely prevented. The reason for this is thought to be that the pressure imbalance generated within the extrusion drum 5 is absorbed by the movement of the intermediate portion of the sink 6, and the distal end portion 10 is not displaced.

このように、本発明によれば流し金6の先端の
部分10や内径口金13を正確に押出ドラム5の
中心に位置させることができ、内径口金13を大
径のものとした場合にもこの作用効果は維持され
るから、内径の大きい中空セラミツクス製品を偏
肉を生じさせることなく押出成形することができ
る。なお実施例では流し金6を3つの部分に分割
したが、複数であればその分割個数は自由であ
る。
As described above, according to the present invention, it is possible to accurately position the tip portion 10 of the sinker 6 and the inner diameter mouthpiece 13 at the center of the extrusion drum 5, and even when the inner diameter mouthpiece 13 is made to have a large diameter, this Since the function and effect are maintained, hollow ceramic products with a large inner diameter can be extruded without causing uneven thickness. In the embodiment, the sink money 6 is divided into three parts, but the number of parts can be freely divided as long as the number of parts is plural.

(発明の効果) 本発明は以上に説明したとおり、従来の常識に
反して流し金を屈曲自在とすることによつて流し
金の先端を正確に押出ドラムの中心に位置させた
ものであり、内径の大きい中空セラミツクス製品
をも変肉を生じさせることなく押出成形すること
ができる。
(Effects of the Invention) As explained above, the present invention, contrary to conventional wisdom, allows the tip of the sink to be accurately positioned at the center of the extrusion drum by making the sink freely bendable. Even hollow ceramic products with a large inner diameter can be extruded without causing wall thickness changes.

よつて本発明は従来の問題点を一掃した押出機
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 greatly contributes to the development of industry as an extruder that eliminates the problems of the conventional extruder.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例を示す一部切欠正面
図、第2図はその要部の拡大断面図である。 4:二次軸、6:流し金、8,9,10:流し
金の分割された部分、11,12:ユニバーサル
ジヨイント。
FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main part thereof. 4: Secondary axis, 6: Sink metal, 8, 9, 10: Divided parts of sink metal, 11, 12: Universal joint.

Claims (1)

【特許請求の範囲】[Claims] 1 坏土押出用の二次軸4の先端に内径成形用の
流し金6を取付けた押出機において、流し金6が
複数個に分解された部分8,9,10からなり、
各部分8,9,10の相互間がユニバーサルジヨ
イント11,12により屈曲自在に連結されたも
のであることを特徴とする押出機。
1 In an extruder in which a sinker 6 for forming the inner diameter is attached to the tip of a secondary shaft 4 for extruding clay, the sinker 6 is composed of parts 8, 9, and 10 that are disassembled into a plurality of parts,
An extruder characterized in that each part 8, 9, 10 is connected to each other in a flexible manner by universal joints 11, 12.
JP6027489A 1989-03-13 1989-03-13 Extruding machine Granted JPH02238906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6027489A JPH02238906A (en) 1989-03-13 1989-03-13 Extruding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6027489A JPH02238906A (en) 1989-03-13 1989-03-13 Extruding machine

Publications (2)

Publication Number Publication Date
JPH02238906A JPH02238906A (en) 1990-09-21
JPH0470125B2 true JPH0470125B2 (en) 1992-11-10

Family

ID=13137398

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6027489A Granted JPH02238906A (en) 1989-03-13 1989-03-13 Extruding machine

Country Status (1)

Country Link
JP (1) JPH02238906A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5291650B2 (en) * 2010-03-23 2013-09-18 日本碍子株式会社 Extrusion method of clay

Also Published As

Publication number Publication date
JPH02238906A (en) 1990-09-21

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