JPH0319823A - Molding method of blow boot sealing lip - Google Patents

Molding method of blow boot sealing lip

Info

Publication number
JPH0319823A
JPH0319823A JP15383389A JP15383389A JPH0319823A JP H0319823 A JPH0319823 A JP H0319823A JP 15383389 A JP15383389 A JP 15383389A JP 15383389 A JP15383389 A JP 15383389A JP H0319823 A JPH0319823 A JP H0319823A
Authority
JP
Japan
Prior art keywords
blow
lip
boot
roller
rollers
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.)
Pending
Application number
JP15383389A
Other languages
Japanese (ja)
Inventor
Toshikatsu Maeda
利勝 前田
Hirotomo Nakabayashi
中林 宏友
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.)
Nippon Mektron KK
Original Assignee
Nippon Mektron KK
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 Nippon Mektron KK filed Critical Nippon Mektron KK
Priority to JP15383389A priority Critical patent/JPH0319823A/en
Publication of JPH0319823A publication Critical patent/JPH0319823A/en
Pending legal-status Critical Current

Links

Landscapes

  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

PURPOSE:To enable recessed and protruded lip parts to be formed in a sealing end inner peripheral surface simply and cheaply by holding the sealing end of a molded blow boot between a roller having a pressing surface in its outer periphery and roller having a lip molding surface in its outer periphery, and making the rollers rotate each other in an opposite direction in a heated state. CONSTITUTION:The outer surface 12 of an outside pressing roller 11 is a smooth pressing surface. An inner lip molding roller is generally adapted with a plurality of rollers, for example, three same diameter rollers 13, 14, 15 which are radially arranged at intervals on a circumference R wherein axes C1, C2, C3 parallel the rotating axis C0 of the roller and the center is identical with the center line C in the sealing end 2 of a blow boot 1 to be held thereby. The sealing end 2 of the blow boot 1 is held between the lip molding surface 16 of the roller 13 and the pressing surface 12 of the pressing roller 11. These rollers are rotated each other in the opposite direction while being heated at 70-180 deg.C in accordance with materials. Thus the mold of a high accurate sealing lip can be performed generalizedly.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は,ブローブーツシールリップの戊形方法に関す
る。更に詳しくは、ブローブーツのシール用端部内局面
にシールリップを形成させたブローブーツシールリップ
の成形方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for shaping a blow boot seal lip. More specifically, the present invention relates to a method of forming a blow boot seal lip in which a seal lip is formed on the inner surface of the sealing end of the blow boot.

〔従来の技術〕[Conventional technology]

ブローブーツは,主に自動車用のステアリングビニオン
、等速ジョイント、ドライブシャフト、チェンジレバー
、インジェクションポンプ、カーヒーターなどの保護を
目的としたフレキシブルダストシールとして使用されて
いる. このような用途に用いられているブローブーツは,蛇腹
状の雌型部を有するブロー戒形金型内に円筒状パリソン
をセットし,一方側からのエア吹込みによって蛇腹部を
形成させるブロー成形法によって成形されている。
Blow boots are mainly used as flexible dust seals to protect automotive steering binions, constant velocity joints, drive shafts, change levers, injection pumps, car heaters, etc. Blow boots used for such purposes are made by blow molding, in which a cylindrical parison is set in a blow mold with a bellows-shaped female part, and the bellows part is formed by blowing air from one side. shaped by law.

かかるブロー成形法によって得られるブローブーツは、
第3図に示されるような形状を有している。シャフト部
材などに嵌合されて使用されるブローブーツのシールは
、ブローブーツ1のシール用端部(大径側口元)2の内
周面に形成されたフラットな内周面3によって行われる
が,このシール面によって行われるシールは満足される
ものではない。
The blow boots obtained by this blow molding method are
It has a shape as shown in FIG. The sealing of the blow boot that is used while being fitted to a shaft member is performed by a flat inner circumferential surface 3 formed on the inner circumferential surface of the sealing end (large diameter side opening) 2 of the blow boot 1. , the seal provided by this sealing surface is not satisfactory.

そこで、第5図に示される如く、このシール面に1条以
上、好ましくは複数条の凹凸状リップ部4,4′・・・
・を形成させ、シール性を向上させることが強く求めら
れている.しかしながら、単なるブロー成形法によった
のでは、ブローブーツの戊形時にそのシール端部内周面
にリップ部を同時に成形させることはできない. このように、l工程の成形ではシール端部内周面にリッ
プ部を成形させたブローブーツは成形し得ないが、連続
した2工程よりなるインジェクションブロー成形法を用
いれば,ブローブーツのシール端部内局面にリップ部を
形威させることが可能である。
Therefore, as shown in FIG. 5, this sealing surface has one or more, preferably multiple, uneven lip portions 4, 4'...
There is a strong need to improve sealing performance by forming . However, if a simple blow molding method is used, it is not possible to simultaneously mold a lip portion on the inner peripheral surface of the seal end when the blow boot is formed. In this way, it is not possible to mold a blow boot with a lip molded on the inner circumferential surface of the seal end in the first step of molding, but if the injection blow molding method, which consists of two consecutive steps, is used, the inside of the seal end of the blow boot can be molded. It is possible to form a lip part on the curved surface.

この成形法では、まず第4図に示される如く、射出成形
法によりリップ部4,4′・・・・を端部内周面に形威
させた円筒体5を成形した後、射出戊形金型から離型さ
せたリップ付き円筒体を蛇腹状の雌型部を有するブロー
成形金型内にセットし、エアー吹込みによってブロー成
形して、第5図に示される如く、円筒体中央部に蛇腹部
6.6’,・・・・を形威させている. しかしながら、このインジェクションブロー成形法は、
合理的で成形サイクルも短くできるが,成形工程数の増
加に伴う設備投資によってコスト高になるばかりではな
く,ブロー成形時に蛇腹部をふくらませるための型温の
設定維持が難かしく、ブロー成形を通して得られる目的
物に不良品発生率が高いという不具合がみられる。こう
した理由により,戊形法によるブローブーツの成形は,
部の特定の製品において実用化されているだけである。
In this molding method, first, as shown in FIG. 4, a cylindrical body 5 having lip portions 4, 4', . The cylindrical body with a lip released from the mold is set in a blow molding mold having a bellows-shaped female mold part, and blow molding is performed by blowing air, so that the central part of the cylindrical body is molded as shown in FIG. The bellows part has a 6.6'... shape. However, this injection blow molding method
Although it is reasonable and can shorten the molding cycle, it not only increases the cost due to equipment investment due to the increased number of molding processes, but also makes it difficult to maintain the mold temperature setting to inflate the bellows part during blow molding. There is a problem in that there is a high incidence of defective products in the target products. For these reasons, blow boots are formed using the cylindrical method.
It has only been put into practical use in some specific products.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

本発明の目的は,ブロー成形法によって成形されたブロ
ーブーツを用い、そのシール端部内周面に凹凸状のリッ
プ部を形或させるブローブーツシールリップの成形方法
を提供することにある。
An object of the present invention is to provide a method for forming a blow boot seal lip, which uses a blow boot formed by a blow molding method and forms an uneven lip portion on the inner circumferential surface of the seal end thereof.

〔課題を解決するための手段〕[Means to solve the problem]

本発明方法によるブローブーツシールリップの戒形は,
ブロー成形法によって成形されたブローブーツのシール
用端部を,外周に押え面を有する外側押えローラと外周
にリップ成形面を有する内側リップ成形ローラとの間に
挟着し、これらのローラを加熱状態で互いに反対方向に
回転させ、シール用端部の内周面にリップ部を形威させ
ることによって行われる. 次に,図面の第1〜2図を参照しながら,本発明方法を
説明する.第1図は,本発明方法を実施した場合の斜視
図(a)ならびに要部断面図(b)である.また,第2
図は,本発明方法に用いられる成形装置の平面図である
. この成形装置は,外周に押え面を有する外側押えローラ
と外周にリップ成形面を有する内側リップ成形ローラと
からなり、これらの各ローラはすべてモーターで駆動さ
せることができるが、一般には外側押えローラをモータ
ー2lで駆動させ、内側リップ成形ローラをこれに従動
させた状態で用いられる. 外側押えローラ11は、回転自在に軸支されていて、そ
の外周面12は滑らかな押え面として形成されている.
内側リップ成形ローラは,一般に複数個用いられ,図示
された態様では3個の同一径のローラ13, 14, 
15が用いられている.これら3個の同一径ローラは,
それらの回転軸線C,, C,, C,が押えローラの
回転軸線C0に対していずれも平行であり、かつ回転軸
線C1〜C3が挟着されるブロープーツ1のシール用端
部2の中心線Cとその中心を同一にする円周R上に間隔
をおいて,一般には等間隔をおいて放射状に配置され、
その内の1個のローラl3は、そのリップ成形面16と
押えローラ11の押え面12との間に、プロー成形法に
よって成形されたブローブーツ1のシール用端部2を挾
着させる. なお、複数個のリップ成形ローラとしては、それぞれ径
の異なるものを用いることもでき、この場合には、それ
らの回転軸線はシール用端部と中心を同一にする円周上
には配置されず,シール用端部の内周面に当接する位置
に放射状に配置される. シール用端部2の内周面へのリップ部の形成は、それぞ
れ温度調節計22に接続されたヒーター23,23′お
よび熱電対24, 24’が押えローラおよびリップ成
形ローラに取付けられており、このような加熱手段によ
ってブローブーツを形成する熱可塑性樹脂やゴムの種類
に応じて約70−180℃に加熱しながら、これらのロ
ーラを互いに反対方向に回転させることにより行われ、
そこに凹凸状,波形などのシール部を形成させる。なお
、ローラの加熱は、湯浴その他任意の手段で行うことが
できる.更に、ブローブーツのシール用端部の内周面に
より正確な形状、寸法のシールリップ部を形威させるた
めには、図面の第6図に示されるように、ブロー戊形法
によって成形されたブローブーツ31として,そのシー
ル用端部32の外周面にセレーションまたは角スプライ
ンなどの歯形形状33を形威させたものを用い、また外
側押えローラ34として外周にそれに対応するセレーシ
ョンまたは角スプラインなどの歯形形状35を形成させ
たものを用い、これらのセレーションまたは角スプライ
ンなどの歯形同士を互いに噛み合せた状態で回転させる
と、押えローラの軸線方向への回転位置のずれによる2
重押しリップの形成などといった事態を避けることがで
き,その結果としてより正確な形状、寸法のシールリッ
プ部を押圧されたシール用端部の内周面側に形成させる
ことができる。
The shape of the blow boot seal lip according to the method of the present invention is as follows:
The sealing end of the blow boot formed by the blow molding method is sandwiched between an outer pressing roller having a pressing surface on the outer periphery and an inner lip forming roller having a lip forming surface on the outer periphery, and these rollers are heated. This is done by rotating the seals in opposite directions and forming a lip on the inner circumferential surface of the sealing end. Next, the method of the present invention will be explained with reference to FIGS. 1 and 2 of the drawings. FIG. 1 is a perspective view (a) and a sectional view (b) of essential parts when the method of the present invention is implemented. Also, the second
The figure is a plan view of the molding device used in the method of the present invention. This forming device consists of an outer presser roller that has a presser surface on its outer periphery and an inner lip forming roller that has a lip forming surface on its outer periphery.All of these rollers can be driven by a motor, but generally the outer presser roller It is used with the inner lip forming roller driven by a motor 2l and the inner lip forming roller following this. The outer pressing roller 11 is rotatably supported, and its outer peripheral surface 12 is formed as a smooth pressing surface.
Generally, a plurality of inner lip forming rollers are used, and in the illustrated embodiment, three rollers 13, 14, of the same diameter are used.
15 is used. These three rollers with the same diameter are
Those rotational axes C,, C,, C, are all parallel to the rotational axis C0 of the presser roller, and the rotational axes C1 to C3 are the center line of the sealing end 2 of the blowpoot 1 to which they are clamped. They are generally arranged radially at equal intervals on the circumference R that has the same center as C,
One of the rollers l3 clamps the sealing end 2 of the blow boot 1 formed by blow molding between its lip forming surface 16 and the pressing surface 12 of the pressing roller 11. Note that it is also possible to use multiple lip forming rollers with different diameters, and in this case, their rotation axes are not arranged on the circumference whose center is the same as the sealing end. , are arranged radially at positions that contact the inner peripheral surface of the sealing end. Formation of the lip portion on the inner circumferential surface of the sealing end portion 2 is achieved by attaching heaters 23, 23' and thermocouples 24, 24', each connected to a temperature controller 22, to a presser roller and a lip forming roller. , by rotating these rollers in opposite directions while heating the thermoplastic resin or rubber forming the blow boot to approximately 70-180° C. depending on the type of the blow boot by such heating means,
A seal portion having an uneven shape or a wave shape is formed there. The rollers can be heated using a hot water bath or any other suitable means. Furthermore, in order to form a seal lip part with a more accurate shape and dimensions on the inner circumferential surface of the sealing end of the blow boot, as shown in Figure 6 of the drawings, the seal lip part is formed by the blow forming method. As the blow boot 31, a tooth profile 33 such as serrations or square splines is formed on the outer circumferential surface of the sealing end 32, and as an outer pressing roller 34, a corresponding serration or square spline is formed on the outer circumference. If a tooth profile 35 is formed and rotated with the tooth profiles such as serrations or square splines meshing with each other, the rotational position of the presser roller in the axial direction may shift.
A situation such as the formation of a heavy pressing lip can be avoided, and as a result, a sealing lip portion having a more accurate shape and size can be formed on the inner peripheral surface side of the pressed sealing end portion.

〔発明の効果〕〔Effect of the invention〕

本発明方法で用いられる2種類のローラは、それらの形
状からも分かるように、簡単かつ廉価に製作し得るので
、種々の形状および寸法のシール用端部を有するブロー
ブーツに容易に適用することができる.しかも、そこに
形成されたリップ部の形状は正確かつきれいであり、そ
のため不良品の発生率を著しく低下せしめている。
The two types of rollers used in the method of the invention are simple and inexpensive to manufacture, as evidenced by their shape, and can therefore be easily adapted to blow boots with sealing ends of various shapes and dimensions. Can be done. Moreover, the shape of the lip formed therein is accurate and neat, which significantly reduces the incidence of defective products.

従って、今後ブローブーツのシール性の向上対策として
重要視される高精度のシールリップ部の戊形が、ブロー
成形法によって成形されたブローブーツを用いる本発明
方法により汎用的に実施可能となり、それの工業的意義
はきわめて大なるものがある。
Therefore, the highly accurate shaping of the seal lip part, which will be considered important as a measure to improve the sealing performance of blow boots in the future, can be carried out universally by the method of the present invention using blow boots formed by blow molding. has enormous industrial significance.

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

第工図は、本発明方法の基本的態様を実施した場合の斜
視図(a)ならびに要部断面図(b)である。 第2図は,本発明方法に用いられる成形装置の平面図で
ある。第3図は、本発明方法で用いられる従来のブロー
ブーツの部分半裁断面図である。第4図は、インジェク
ションブ口ー成形法の射出成形工程で得られたリップ付
円筒体の部分半裁断面図である。第5図は、インジェク
ションブロー成形法のブロー成形工程あるいは本発明方
法で得られるシールリップ付ブローブーツの部分半裁断
面図である。また、第6図は、本発明方法の他の態様を
実施した場合の斜視図である. (符号の説明) 1・・・・・ブローブーツ 2・・・・・シール用端部 3・・・・・シール用端部内局面 4・・・・・リップ部 6・・・・・蛇腹部 11・・・・・外側押えローラ l2・・・・・外側押えローラ押え面 l3・・・・・リップ成形ローラ 14・・・・・リップ成形ローラ l5・・・・・リップ成形ローラ 16・・・・・リップ成形ローラ成形面31・・・・・
ブローブーツ 32・・・・・シール用端部 33・・・・・セレーション、角スプライン34・・・
・・外側押えローラ
The construction drawings are a perspective view (a) and a sectional view (b) of essential parts when the basic aspect of the method of the present invention is carried out. FIG. 2 is a plan view of a molding apparatus used in the method of the present invention. FIG. 3 is a partial cross-sectional view of a conventional blow boot used in the method of the present invention. FIG. 4 is a partially cut-away sectional view of a cylindrical body with a lip obtained by the injection molding process of the injection vent molding method. FIG. 5 is a partially cut-away sectional view of a blow boot with a seal lip obtained by the blow molding process of the injection blow molding method or the method of the present invention. Further, FIG. 6 is a perspective view of another embodiment of the method of the present invention. (Explanation of symbols) 1...Blow boot 2...Sealing end 3...Sealing end inner curved surface 4...Lip part 6...Bronze part 11...Outer press roller l2...Outer press roller press surface l3...Lip forming roller 14...Lip forming roller l5...Lip forming roller 16... ...Lip forming roller forming surface 31...
Blow boot 32... Seal end 33... Serration, square spline 34...
・Outer presser roller

Claims (1)

【特許請求の範囲】 1、ブロー成形法によって成形されたブローブーツのシ
ール用端部を、外周に押え面を有する外側押えローラと
外周にリップ成形面を有する内側リップ成形ローラとの
間に挟着し、これらのローラを加熱状態で互いに反対方
向に回転させ、シール用端部の内周面にリップ部を形成
させることを特徴とするブローブーツシールリップの成
形方法。 2、ローラの回転軸線を、挟着されるブローブーツシー
ル用端部と中心を同一にする円周上に間隔をおいて配置
した複数個の同一径内側リップ成形ローラが用いられる
請求項1記載のブローブーツシールリップの成形方法。 3、ブロー成形法によって成形され、そのシール用端部
の外周面に歯形形状を形成させたブローブーツが用いら
れ、外側押えローラとして外周にそれに対応する歯形形
状を形成させたものが用いられる請求項1記載のブロー
ブーツシールリップの成形方法。
[Claims] 1. The sealing end of a blow boot formed by a blow molding method is sandwiched between an outer pressing roller having a pressing surface on the outer periphery and an inner lip forming roller having a lip forming surface on the outer periphery. A method for forming a blow boot seal lip, which comprises: attaching the rollers to each other and rotating these rollers in opposite directions in a heated state to form a lip portion on the inner circumferential surface of the sealing end. 2. A plurality of inner lip forming rollers of the same diameter are used, the inner lip forming rollers having the same diameter being arranged at intervals on a circumference whose rotation axis is aligned with the center of the blow boot sealing end to be sandwiched. How to mold the blow boot seal lip. 3. A blow boot that is molded by a blow molding method and has a tooth profile formed on the outer peripheral surface of its sealing end is used, and an outer pressing roller that has a corresponding tooth profile formed on the outer periphery is used. Item 1. A method for forming a blow boot seal lip according to item 1.
JP15383389A 1989-06-16 1989-06-16 Molding method of blow boot sealing lip Pending JPH0319823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15383389A JPH0319823A (en) 1989-06-16 1989-06-16 Molding method of blow boot sealing lip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15383389A JPH0319823A (en) 1989-06-16 1989-06-16 Molding method of blow boot sealing lip

Publications (1)

Publication Number Publication Date
JPH0319823A true JPH0319823A (en) 1991-01-29

Family

ID=15571089

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15383389A Pending JPH0319823A (en) 1989-06-16 1989-06-16 Molding method of blow boot sealing lip

Country Status (1)

Country Link
JP (1) JPH0319823A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002254500A (en) * 2001-03-06 2002-09-11 Keeper Co Ltd Method for molding seal lip on inner peripheral surface of blow molded product

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150721A (en) * 1983-02-18 1984-08-29 Yoshida Kogyo Kk <Ykk> Method and apparatus for forming corrugations on barrel part of cylindrical container

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150721A (en) * 1983-02-18 1984-08-29 Yoshida Kogyo Kk <Ykk> Method and apparatus for forming corrugations on barrel part of cylindrical container

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002254500A (en) * 2001-03-06 2002-09-11 Keeper Co Ltd Method for molding seal lip on inner peripheral surface of blow molded product
JP4695767B2 (en) * 2001-03-06 2011-06-08 キーパー株式会社 Method of forming a seal lip on the inner peripheral surface of a blow molded product

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