JP3926130B2 - Tapered thread rolling head for pipes - Google Patents

Tapered thread rolling head for pipes Download PDF

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Publication number
JP3926130B2
JP3926130B2 JP2001318422A JP2001318422A JP3926130B2 JP 3926130 B2 JP3926130 B2 JP 3926130B2 JP 2001318422 A JP2001318422 A JP 2001318422A JP 2001318422 A JP2001318422 A JP 2001318422A JP 3926130 B2 JP3926130 B2 JP 3926130B2
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lever
screw
cam ring
thread rolling
roller
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JP2001318422A
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JP2003126937A (en
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昌昭 円山
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Rex Industries Co Ltd
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Rex Industries Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は管用テーパーねじ転造用ヘッドに関する。詳しくは、外周に樹脂が被覆された被加工管をねじ転造加工する場合、樹脂被覆の予め除去する部分を少なくすることができ、且つ、ねじ転造加工後、被加工管を逆転させずに取り出し可能とした管用テーパーねじ転造用ヘッドに関する。
【0002】
【従来の技術】
従来、水道配管用の鋼管を管継手を用いて接続する場合には、鋼管の端部に管用テーパーねじを加工する必要があるが、その場合、テーパーねじの加工には切削形成する方法と、塑性加工による方法とがある。
【0003】
塑性加工による方法には、1例としてねじ転造用ヘッドが用いられている。図6〜図9はテーパーねじ転造用ヘッドの1例を示す図で、図6は正面図、図7は図6のA−A線における断面図、図8は裏蓋を除いた状態を示す図、図9は要部分解斜視図である。各図において、符号1はハウジングであり、該ハウジング1は、円筒状の中間部材2と、該中間部材2にねじ5にて固定された表蓋3と裏蓋4とよりなる。そして、該ハウジング1の中には図7及び図8に示すように中間部材2の内周に接して回動できるロータ6と、複数個のねじ転造用ローラ7が収容されている。
【0004】
そして、ねじ転造用ローラ7は、表蓋3及び裏蓋4にそれぞれ保持された偏心軸受8に軸9を介して回動自在に且つ同一円周上に等間隔に配置されており、該偏心軸受8は表蓋3または裏蓋4に支持される円板部8aに偏心して軸孔8bが設けられ、且つ先端にピン8cを有するレバー8dが形成されている。
【0005】
また、ロータ6は、前記偏心軸受8のピン8cに係合する複数の溝6aが形成されている。さらに該ロータ6には図6に示すように表蓋3に形成された窓3aを通してロータ駆動用のアーム10がねじ11により取り付けられている。そして該アーム10によりロータ6を回動することにより、溝6a、ピン8cを介して偏心軸受8を回動し、ねじ転造用ローラ7をハウジング1の半径方向に移動できるようになっている。また該ロータ駆動用アーム10には図7に示すように偏心ピン12aを有する調節つまみ12bが設けられている。
【0006】
また、裏蓋4には図7及び図9の如く、被加工管13とほぼ同径で且つハウジング1の中心軸方向に摺動可能な当て金14と、該当て金14に設けられたピン14aに係合して駆動されるレバー15がピン16に軸支されて設けられている。また、裏蓋4と中間部材2を挿通してブッシユ17が挿入された底付き孔18が穿設され、該底付き孔18にはばね19により付勢されたカムロッド20が挿入され、該カムロッド20は前記レバー15に係合し押圧駆動されるようになっている。
【0007】
カムロッド20にはカムとなる斜面20aが形成されており、該斜面20aに当接するカム従動面21aを一端に有し他端にピン21bを有し、且つ中央部をピン22で軸支された従動レバー21が中間部材2と裏蓋4との間に設けられている。
【0008】
また、中間部材の扇形部分にはハウジング1の中心を中心とする円弧状の2本の案内溝23,23′が形成され、該案内溝23,23′に案内されて摺動可能な摺動部材24が設けられている。そして図9の如く、該摺動部材24の一方の面には前記従動レバー21のピン21bに係合するカム溝25が形成され、上部には、ピン26に軸支された偏心ピン係合用レバー27が設けられ、前記ロータ駆動用のアーム10に設けられた偏心ピン12aに係脱自在に係合されており、該偏心ピン12a及び調節つまみ12bと前記偏心ピン係合用レバー27とでねじ径調節機構12を構成している。また、前記摺動部材24はばね28により矢印F方向に付勢されている。
【0009】
そして、図7の如く前方から被加工管13を挿入した状態から、該被加工管13を回転させながら押し込むと、該被加工管13はねじ転造用ローラ7によりねじを転造されながら矢印B方向に引き込まれる。同時に当て金14も被加工管13により押し出されてレバー15を矢印C方向に回動させる。
【0010】
レバー15が回動すると図9の如く、該レバー15の先端でカムロッド20を押圧しばね19の付勢力に抗して矢印D方向に移動させる。カムロッド20が矢印D方向に移動すると、その斜面20aに当接している従動レバー21のカム従動面21aがカムロッド20の斜面20aをすべり降り該従動レバー21を矢印E方向に回動させ、ピン21bを上方へ移動させる。
【0011】
ピン21bが上方へ動くと、該ピン21bに係合している摺動部材24のカム溝25の斜面25aがピン21bの拘束から開放される。これにより摺動部材24はばね28の引っ張り力により矢印F方向に移動する。そして該摺動部材24の偏心ピン係合用レバー27に係合している偏心ピン12aを介してロータ駆動用アーム10も該摺動部材24と共に移動しロータ6を回動させ、図10の如く該ロータ6の溝6aに係合している偏心軸受8のピン8cを矢印G方向に移動しレバー8dを(a)図の状態から(b)図の状態に回動させ、転造用ローラ7を被加工管13から隔離させる。これにより被加工管13を回転させることなく引き出すことができる。
【0012】
なお、ねじ径調節機構12は、つまみ12bを回転して偏心ピン12aの位置を調節することにより、摺動部材24とロータ駆動アーム10との相対位置を変化させ、ロータ6の初期位置を調整することができる。これにより偏心軸受8を介して転造用ローラ7の半径方向の位置を調整し、転造するねじのねじ径を調節することができる。
【0013】
【発明が解決しようとする課題】
上記従来の管用テーパーねじ転造用ヘッドにおいては、防錆用樹脂が被覆された樹脂被覆管にねじ転造加工を行う場合、予めねじ加工部分の樹脂被覆を除去するが、偏心軸受の外径が大きいため、表蓋の内径が小さくなり樹脂被覆が当たるため、ねじ加工部分より余分に樹脂被覆を除去する必要がある。このため実際の配管時に、樹脂被覆を余分に除去した部分に多量の防錆用のテープを巻回しなければならないという問題がある。また、ねじ長さ調整機構部の各摺動部分(符号20a,30a,34aで示す部分)には大きな力が掛かり磨耗が大きいという問題がある。
【0014】
本発明は上記従来の問題点に鑑み、樹脂被覆管のねじ転造前の樹脂被覆を除去する量が少なくてすみ、且つねじ長さ調整機構部の摺動部分の磨耗を少なくした管用テーパーねじ転造用ヘッドを実現することを目的とする。
【0015】
【課題を解決するための手段】
上記目的を達成するため、本発明の請求項1は、表蓋32と裏蓋33と、該表蓋32と裏蓋33とを結合する円筒状の中間部材34とよりなるハウジング30と、前記中間部材34の内側を回動するカムリング35と、中心にローラ軸36が挿通された複数個のねじ転造ローラ31と、前記ローラ軸36の両端をそれぞれ支持し、且つ表蓋32と裏蓋33の内側に放射状に形成された凹溝38に摺動可能に挿入された矩形板状の軸受板37とを具備し、前記軸受板37の長手方向の一方の辺は傾斜して形成されると共に該辺の近傍にピン37bが植設され、前記カムリング35の内側には前記軸受板37の傾斜面37aに対応して傾斜したカム面35a及び傾斜した長溝35bが形成され、該長溝35bに前記軸受板37に植設されたピン37bが係合してなり、前記カムリング35を回動させることによりねじ転造ローラ31がカムリング35の半径方向に移動することを特徴とする。
【0016】
この構成を採ることにより、樹脂被覆管にねじ加工するとき、偏心軸受を用いていないため、予め除去する樹脂被覆の量を少なくすることができる。
【0017】
また、請求項2は、ねじ転造された被加工管39により押圧移動される当て金40と、該当て金40により回動される第1レバー41と、該第1レバー41により回動される第2レバー42と、該第2レバー42により押圧されて移動し、且つ、先端にローラ44を有し、後端にねじ長さ調節ねじ45を有するロッド46とが前記裏蓋33に設けられ、前記カムリング35に固定されて該カムリング35を回動させることができるアーム47と、該アーム47に設けられて前記ローラ44に接触する偏心カム48とを具備した自動切上げ兼ねじ長さ調整機構及びねじ径調整機構が設けられて成ることを特徴とする。
【0018】
この構成を採ることにより、ねじ長さの調整およびねじ径の調整が可能であり、且つ、ねじ転造後にねじ転造ローラを自動的に退避させることができ、被加工管を回転させずにヘッドより取り出すことができる。
【0019】
また、請求項3は、前記第1レバー41が扇形をなし、所定角度回動すると当て金40との係合が離脱する安全機構が設けられて成ることを特徴とする。この構成を採ることにより、もし被加工管のねじ加工が長くなり、当て金を押圧し過ぎても、第1レバーとの係合が外れねじ長さ調整機構の損傷を防止することができる。
【0020】
また、請求項4は、前記表蓋32の前部中央に被加工管39の外径を切削することができる外径切削部52が移動可能にアーム51により支持されて設けられ、該外径切削部52は、ハウジング30の側方に退避し、さらにその状態から後方に退避できるように前記アーム51に折れ曲り可能部が設けられて成ることを特徴とする。この構成を採ることにより、外径切削部が邪魔にならず、ヘッドを使用する装置が小型のもので可となる。
【0021】
【発明の実施の形態】
図1乃至図4は本発明の管用テーパーねじ転造用ヘッドの実施の形態を示す図で、図1は正面図、図2は図1のB−B線における断面図、図3は内部構成図、図4は自動切上げ機構及び被加工管外径切削部を示す図である。本実施の形態は、ねじ転造機構の他に、自動切上げ兼ねじ長さ調整機構、ねじ径調整機構、及び被加工管外径切削機構の各機構部を有する。
【0022】
前記ねじ転造機構部は、図2及び図3に示す如く、ハウジング30と、複数個のねじ転造ローラ31とを具備しており、ハウジング30は、表蓋32と裏蓋33と、該表蓋32と裏蓋33とを結合する円筒状の中間部材34とよりなり、該中間部材34の内側には該中間部材34の内側に接して回動するカムリング35が設けられている。そして、前記ねじ転造ローラ31は中心にローラ軸36が挿通され、該ローラ軸36の両端はそれぞれ矩形板状の軸受板37に支持されており、該軸受板37は表蓋32及び裏蓋33の内側に放射状に形成された凹溝38に摺動可能に挿入されている。なお、ローラ軸36は成形する転造ねじのリード角に応じて傾斜して支持されている。
【0023】
また図3の如く、前記軸受板37の一方の辺(カムリングに対向する辺)は傾斜して傾斜面37aが形成され、前記カムリング35の内側には前記軸受板37の傾斜面37aに対応したカム面35aと、該カム面35aに平行した長溝35bが形成され、前記軸受板37の傾斜した辺の近傍には前記長溝35bに係合したピン37bが植設されている。
【0024】
また、自動切上げ兼ねじ長さ調整機構及びねじ径調整機構は図2の如く、ねじ転造中の被加工管39により押圧移動され且つ裏蓋33に摺動自在に設けられた当て金40と、該当て金40により回動されピン41aで回動自在に支持された扇形の第1レバー41と、該第1レバー41により回動されピン42aにより回動自在に支持された第2レバー42と、該第2レバー42により押圧されて案内筒43内を移動し、且つ、先端にローラ44を有し、後端にねじ長さ調節ねじ45を有するロッド46とが前記裏蓋33に設けられている。また、前記カムリング35には該カムリング35を回動させるよとができるアーム47が固定されて、該アーム47には図4(a)の如く前記ローラ44に接触する偏心カム48がつまみ48aにより回動可能に設けられている。
【0025】
また、被加工管外径切削機構は図1、2及び図4に示すように、表蓋32の側部にヘッドの中心線に平行に形成された孔49にシャフト50が回動自在に支持され、該シャフト50にはヒンジピン50aにより支持されたアーム51に円筒形の外径切削部52が設けられ、該外径切削部52は表蓋32の前部中央に位置することができるようになっている。なお、外径切削部52には被加工管39の外径を切削することができる図示なき刃が設けられている。
【0026】
このように構成された本実施の形態は、図2の状態で被加工管39を回転させながら外径切削部52に挿入させることによりその外径を切削することができる。次いで、図1の如く、外径切削部52を軸50を中心にしてヘッドの側方に回転させ、次いで図4の如く、ヒンジピン50aを中心にして回動して後方に退避させた後、被加工管39を回転させながら図2の矢印A方向に進めて、ねじ転造ローラ31間に挿入させることによりその外径にテーパーねじを転造することができる。
【0027】
さらに転造が進み、被加工管39が当て金40を押圧移動させると、第1レバー41が矢印B方向に回動し、第2レバー42が矢印C方向に回動され、さらに第2レバー42によりロッド46が矢印D方向に移動する。そして、ロッド46の先端に設けられたローラ44が偏心カム48からはずれると、図3に示すアーム47がカムリング35と共にばね35cにより引っ張られ矢印E方向に回動する。同時に図5(a)の状態から図5(b)のようにカムリング35のカム面35aの移動により複数の軸受板37はそのピン37bが長溝35bにより案内されて拡開する方向に移動する。これにより複数のねじ転造ローラ31が外方に移動するため、ねじ転造ローラ31のねじと被加工管39のねじとの噛み合いが外れ、被加工管39を回転させずに取り出すことができる。
【0028】
このようなねじ転造加工の際、当て金40が被加工管39により押圧された場合、第1レバー41及び第2レバー42には摺動部分がなく、またロッド46は先端にローラ44が設けられているため、軽く動くようになっている。従って磨耗は少ない。また、ねじ長さ調節ねじ45を進退させることにより前記ローラ44が偏心ピン48から離脱する時期を調節でき、ねじ長さを調節することができる。また偏心カム48を回動しアーム47を介してカムリング35の初期位置を調節することにより、軸受板37の位置を調節し、これによりねじ径を調節することができる。
【0029】
また、当て金40が何らかの原因で過度に移動した場合でも、第1レバー41が、所定角度回動すると該第1レバー41は当て金40の先端から外れるため、それ以上は回動しない。そのため第1レバー41以下の機構は動かず従って機構には過度な力は掛からず安全である。
また、被加工管外径切削部は、ヘッドのそ側方からさらに後方に退避させることができるため、へッドを装着するねじ転造機を小型にできる。
【0030】
【発明の効果】
本発明の管用テーパーねじ転造用ヘッドに依れば、従来の如くねじ転造用ローラの軸受に偏心軸受を用いず板状の軸受を用いたため、該軸受板は軸受部分を小さくでき樹脂被覆管の外径に干渉しないため、予め樹脂被覆を除去する部分が少なくてすむ。また、自動切上げ機構兼ねじ長さ調節機構の磨耗部を少なくしたため磨耗が少なくなり信頼性の向上が得られる。さらに、被加工管外径切削部をヘッドの側方且つ後方に退避できるようにしたため装着するねじ切り装置を大型化する必要がない。
【図面の簡単な説明】
【図1】本発明の管用テーパーねじ転造用ヘッドの実施の形態を示す正面図である。
【図2】図1のB−B線における断面図である。
【図3】本発明の管用テーパーねじ転造用ヘッドの実施の形態の内部構成図である。
【図4】本発明の管用テーパーねじ転造用ヘッドの実施の形態を示す図で、(a)は図2のZ矢視図、(b)は被加工管外径切削部を示す図である。
【図5】本発明の管用テーパーねじ転造用ヘッドの実施の形態の作用を説明するための図である。
【図6】従来の管用テーパーねじ転造用ヘッドを示す正面図である。
【図7】図6のA−A線における断面図である。
【図8】従来の管用テーパーねじ転造用ヘッドの裏蓋を除去した状態を示す図である。
【図9】従来の管用テーパーねじ転造用ヘッドの要部分解斜視図である。
【図10】従来の管用テーパーねじ転造用ヘッドの作用を説明するための図である。
【符号の説明】
30…ハウジング
31…ねじ転造ローラ
32…表蓋
33…裏蓋
34…中間リング
35…カムリング
36…ローラ軸
37…軸受板
38…凹溝
39…被加工管
40…当て金
41…第1レバー
42…第2レバー
43…案内筒
44…ローラ
45…ねじ長さ調節ねじ
46…ロッド
47…アーム
48…偏心カム
49…孔
50…シャフト
51…外径切削部支持アーム
52…外径切削部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a taper thread rolling head for pipes. Specifically, when threading a tube to be processed whose outer periphery is coated with a resin, it is possible to reduce the portion of the resin coating to be removed in advance, and after the thread rolling process, the tube to be processed is not reversed. The present invention relates to a taper thread rolling head for a pipe that can be removed.
[0002]
[Prior art]
Conventionally, when connecting a steel pipe for water pipe using a pipe joint, it is necessary to process a taper screw for the pipe at the end of the steel pipe. There is a method by plastic working.
[0003]
For example, a screw rolling head is used in the plastic working method. 6 to 9 are diagrams showing an example of a taper thread rolling head, FIG. 6 is a front view, FIG. 7 is a cross-sectional view taken along line AA in FIG. 6, and FIG. FIG. 9 is an exploded perspective view of the main part. In each figure, reference numeral 1 denotes a housing. The housing 1 includes a cylindrical intermediate member 2, and a front cover 3 and a back cover 4 fixed to the intermediate member 2 with screws 5. As shown in FIGS. 7 and 8, the housing 1 accommodates a rotor 6 that can rotate in contact with the inner periphery of the intermediate member 2 and a plurality of screw rolling rollers 7.
[0004]
The thread rolling rollers 7 are arranged on the eccentric bearings 8 respectively held on the front cover 3 and the back cover 4 so as to be rotatable via a shaft 9 and at equal intervals on the same circumference. The eccentric bearing 8 is eccentrically formed in a disc portion 8a supported by the front lid 3 or the back lid 4 and is provided with a shaft hole 8b, and a lever 8d having a pin 8c at the tip is formed.
[0005]
The rotor 6 is formed with a plurality of grooves 6 a that engage with the pins 8 c of the eccentric bearing 8. Further, as shown in FIG. 6, the rotor driving arm 10 is attached to the rotor 6 with a screw 11 through a window 3 a formed in the front cover 3. By rotating the rotor 6 by the arm 10, the eccentric bearing 8 is rotated through the groove 6 a and the pin 8 c, and the screw rolling roller 7 can be moved in the radial direction of the housing 1. . The rotor driving arm 10 is provided with an adjustment knob 12b having an eccentric pin 12a as shown in FIG.
[0006]
Further, as shown in FIGS. 7 and 9, the back cover 4 has an approximately the same diameter as the work tube 13 and a slidable metal 14 in the direction of the central axis of the housing 1, and corresponding pins provided on the gold 14. A lever 15 that is engaged with and driven by 14 a is pivotally supported by a pin 16. Further, a bottomed hole 18 through which the bush 17 is inserted is inserted through the back cover 4 and the intermediate member 2, and a cam rod 20 biased by a spring 19 is inserted into the bottomed hole 18. 20 is engaged with the lever 15 and is driven to be pressed.
[0007]
The cam rod 20 is formed with a slope 20a serving as a cam. A cam driven surface 21a that contacts the slope 20a is provided at one end, a pin 21b is provided at the other end, and a central portion is pivotally supported by a pin 22. A driven lever 21 is provided between the intermediate member 2 and the back cover 4.
[0008]
In addition, two arc-shaped guide grooves 23 and 23 'centering on the center of the housing 1 are formed in the fan-shaped portion of the intermediate member, and the slide is slidable while being guided by the guide grooves 23 and 23'. A member 24 is provided. As shown in FIG. 9, a cam groove 25 that engages with the pin 21b of the driven lever 21 is formed on one surface of the sliding member 24, and an eccentric pin that is pivotally supported by the pin 26 is engaged at the upper part. A lever 27 is provided and is detachably engaged with an eccentric pin 12a provided on the arm 10 for driving the rotor. The eccentric pin 12a and the adjustment knob 12b and the eccentric pin engaging lever 27 are screwed together. A diameter adjusting mechanism 12 is configured. The sliding member 24 is biased in the direction of arrow F by a spring 28.
[0009]
Then, when the work tube 13 is pushed in from the state in which the work tube 13 is inserted from the front as shown in FIG. 7, the work tube 13 is rotated by the screw rolling roller 7 while the screw is being rolled. It is pulled in the B direction. At the same time, the metal stopper 14 is also pushed out by the work tube 13 to rotate the lever 15 in the direction of arrow C.
[0010]
When the lever 15 rotates, the cam rod 20 is pressed at the tip of the lever 15 and moved in the direction of arrow D against the urging force of the spring 19 as shown in FIG. When the cam rod 20 moves in the direction of the arrow D, the cam driven surface 21a of the driven lever 21 that is in contact with the inclined surface 20a slides down the inclined surface 20a of the cam rod 20 and rotates the driven lever 21 in the direction of arrow E, so that the pin 21b Is moved upward.
[0011]
When the pin 21b moves upward, the inclined surface 25a of the cam groove 25 of the sliding member 24 engaged with the pin 21b is released from the restraint of the pin 21b. As a result, the sliding member 24 moves in the direction of arrow F by the pulling force of the spring 28. Then, the rotor driving arm 10 also moves together with the sliding member 24 via the eccentric pin 12a engaged with the eccentric pin engaging lever 27 of the sliding member 24 to rotate the rotor 6, as shown in FIG. The pin 8c of the eccentric bearing 8 engaged with the groove 6a of the rotor 6 is moved in the direction of the arrow G, and the lever 8d is rotated from the state shown in FIG. 7 is isolated from the work tube 13. Thereby, the to-be-processed pipe | tube 13 can be pulled out without rotating.
[0012]
The screw diameter adjusting mechanism 12 adjusts the initial position of the rotor 6 by changing the relative position between the sliding member 24 and the rotor driving arm 10 by adjusting the position of the eccentric pin 12a by rotating the knob 12b. can do. Thereby, the radial position of the rolling roller 7 can be adjusted via the eccentric bearing 8, and the screw diameter of the screw to be rolled can be adjusted.
[0013]
[Problems to be solved by the invention]
In the above conventional taper thread rolling head for pipes, when thread rolling is performed on a resin-coated pipe coated with a rust preventive resin, the resin coating of the threaded part is removed in advance, but the outer diameter of the eccentric bearing Since the inner diameter of the front cover is reduced and the resin coating is applied, it is necessary to remove the resin coating more than the threaded portion. For this reason, at the time of actual piping, there is a problem that a large amount of rust prevention tape must be wound around the portion where the resin coating has been removed excessively. In addition, there is a problem that a large force is applied to each sliding portion of the screw length adjusting mechanism portion (portions indicated by reference numerals 20a, 30a, 34a) and wear is large.
[0014]
In view of the above-described conventional problems, the present invention can reduce the amount of resin coating before screw rolling of a resin-coated tube, and can reduce the wear of the sliding portion of the screw length adjusting mechanism portion. The purpose is to realize a rolling head.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 of the present invention comprises a housing 30 comprising a front cover 32, a back cover 33, and a cylindrical intermediate member 34 that connects the front cover 32 and the back cover 33, A cam ring 35 that rotates inside the intermediate member 34, a plurality of thread rolling rollers 31 with a roller shaft 36 inserted through the center, and supports both ends of the roller shaft 36, and a front cover 32 and a back cover 33 has a rectangular plate-like bearing plate 37 slidably inserted in a concave groove 38 formed radially inside, and one side in the longitudinal direction of the bearing plate 37 is formed to be inclined. In addition, a pin 37b is planted in the vicinity of the side, and an inclined cam surface 35a and an inclined long groove 35b corresponding to the inclined surface 37a of the bearing plate 37 are formed on the inner side of the cam ring 35. Pin 3 planted on the bearing plate 37 b is engaged, thread rolling roller 31 by rotating the cam ring 35 is thus being moved in the radial direction of the cam ring 35.
[0016]
By adopting this configuration, since the eccentric bearing is not used when threading the resin-coated tube, the amount of the resin coating to be removed in advance can be reduced.
[0017]
Further, according to the second aspect of the present invention, the metal fitting 40 pressed and moved by the threaded tube 39, the first lever 41 rotated by the gold 40, and the first lever 41 are rotated. The back cover 33 is provided with a second lever 42 and a rod 46 which is pressed and moved by the second lever 42 and has a roller 44 at the front end and a screw length adjusting screw 45 at the rear end. And an arm 47 that is fixed to the cam ring 35 and can rotate the cam ring 35, and an eccentric cam 48 that is provided on the arm 47 and contacts the roller 44. A mechanism and a screw diameter adjusting mechanism are provided.
[0018]
By adopting this configuration, the screw length and the screw diameter can be adjusted, and the thread rolling roller can be automatically retracted after thread rolling, without rotating the work tube. It can be taken out from the head.
[0019]
A third aspect of the present invention is characterized in that the first lever 41 has a sector shape and is provided with a safety mechanism that disengages from the stopper 40 when the first lever 41 is rotated by a predetermined angle. By adopting this configuration, if the threaded processing of the pipe to be processed becomes long and the presser is pressed too much, the engagement with the first lever is released and damage to the screw length adjusting mechanism can be prevented.
[0020]
Further, according to a fourth aspect of the present invention, an outer diameter cutting portion 52 capable of cutting the outer diameter of the pipe to be processed 39 is provided at the center of the front portion of the front cover 32 so as to be movable and supported by the arm 51. The cutting portion 52 is retracted to the side of the housing 30, and further, a bendable portion is provided on the arm 51 so as to be retracted backward from the state. By adopting this configuration, the outer diameter cutting portion does not get in the way, and the apparatus using the head can be small.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 are diagrams showing an embodiment of a taper thread rolling head for pipes according to the present invention. FIG. 1 is a front view, FIG. 2 is a cross-sectional view taken along line BB in FIG. 1, and FIG. FIGS. 4A and 4B are diagrams showing an automatic rounding mechanism and a machined pipe outer diameter cutting portion. In addition to the thread rolling mechanism, the present embodiment includes each mechanism part of an automatic rounding and screw length adjusting mechanism, a screw diameter adjusting mechanism, and a machined pipe outer diameter cutting mechanism.
[0022]
As shown in FIGS. 2 and 3, the screw rolling mechanism includes a housing 30 and a plurality of screw rolling rollers 31. The housing 30 includes a front cover 32, a back cover 33, A cylindrical intermediate member 34 that joins the front lid 32 and the back lid 33 is formed. A cam ring 35 that rotates in contact with the inner side of the intermediate member 34 is provided inside the intermediate member 34. A roller shaft 36 is inserted in the center of the thread rolling roller 31, and both ends of the roller shaft 36 are supported by a rectangular plate-shaped bearing plate 37. The bearing plate 37 includes a front cover 32 and a back cover. 33 is slidably inserted into concave grooves 38 formed radially inside 33. The roller shaft 36 is supported in an inclined manner according to the lead angle of the rolling screw to be formed.
[0023]
Further, as shown in FIG. 3, one side of the bearing plate 37 (side facing the cam ring) is inclined to form an inclined surface 37a, and the inner side of the cam ring 35 corresponds to the inclined surface 37a of the bearing plate 37. A cam surface 35a and a long groove 35b parallel to the cam surface 35a are formed, and a pin 37b engaged with the long groove 35b is implanted in the vicinity of the inclined side of the bearing plate 37.
[0024]
Further, as shown in FIG. 2, the automatic rounding and screw length adjusting mechanism and the screw diameter adjusting mechanism are pressed and moved by the work tube 39 during the thread rolling and are slidably provided on the back cover 33. The fan-shaped first lever 41 that is rotated by the gold 40 and supported by the pin 41a, and the second lever 42 that is rotated by the first lever 41 and supported by the pin 42a. And a rod 46 which is pressed by the second lever 42 and moves in the guide tube 43, has a roller 44 at the front end, and has a screw length adjusting screw 45 at the rear end. It has been. Further, an arm 47 capable of rotating the cam ring 35 is fixed to the cam ring 35, and an eccentric cam 48 that contacts the roller 44 as shown in FIG. It is provided so that rotation is possible.
[0025]
Further, as shown in FIGS. 1, 2 and 4, the machined pipe outer diameter cutting mechanism is supported by a shaft 49 rotatably in a hole 49 formed in a side portion of the front cover 32 in parallel with the center line of the head. The shaft 50 is provided with a cylindrical outer diameter cutting portion 52 on an arm 51 supported by a hinge pin 50a so that the outer diameter cutting portion 52 can be positioned at the front center of the front cover 32. It has become. Note that the outer diameter cutting portion 52 is provided with an unillustrated blade capable of cutting the outer diameter of the tube 39 to be processed.
[0026]
In the present embodiment configured as described above, the outer diameter can be cut by inserting the tube 39 into the outer diameter cutting portion 52 while rotating the tube to be processed 39 in the state of FIG. Next, as shown in FIG. 1, the outer diameter cutting part 52 is rotated to the side of the head around the shaft 50, and then rotated around the hinge pin 50a as shown in FIG. A taper screw can be rolled to the outer diameter by advancing in the direction of arrow A in FIG.
[0027]
When the rolling progresses further and the work piece 39 presses and moves the stopper 40, the first lever 41 rotates in the arrow B direction, the second lever 42 rotates in the arrow C direction, and the second lever 42 causes the rod 46 to move in the direction of arrow D. When the roller 44 provided at the tip of the rod 46 is removed from the eccentric cam 48, the arm 47 shown in FIG. 3 is pulled together with the cam ring 35 by the spring 35c and rotates in the direction of arrow E. At the same time, as shown in FIG. 5 (b), the plurality of bearing plates 37 are moved from the state shown in FIG. 5 (a) in a direction in which the pin 37b is guided by the long groove 35b to expand. As a result, the plurality of thread rolling rollers 31 move outward, so that the threads of the thread rolling roller 31 and the threads of the work tube 39 are disengaged, and the work tube 39 can be taken out without rotating. .
[0028]
In such a thread rolling process, when the contact metal 40 is pressed by the work tube 39, the first lever 41 and the second lever 42 have no sliding portion, and the rod 46 has a roller 44 at the tip. Because it is provided, it moves lightly. Therefore, there is little wear. Further, when the screw length adjusting screw 45 is advanced and retracted, the timing at which the roller 44 is detached from the eccentric pin 48 can be adjusted, and the screw length can be adjusted. Further, by rotating the eccentric cam 48 and adjusting the initial position of the cam ring 35 via the arm 47, the position of the bearing plate 37 can be adjusted, and thereby the screw diameter can be adjusted.
[0029]
Further, even when the stopper 40 moves excessively for some reason, when the first lever 41 is rotated by a predetermined angle, the first lever 41 is disengaged from the tip of the stopper 40, so that it is not further rotated. Therefore, the mechanism below the first lever 41 does not move, and therefore the mechanism is safe without applying excessive force.
In addition, since the outer diameter cutting portion of the work tube can be retracted further rearward from the side of the head, the thread rolling machine for mounting the head can be reduced in size.
[0030]
【The invention's effect】
According to the taper thread rolling head for pipes of the present invention, a plate-shaped bearing is used instead of an eccentric bearing as a bearing for a thread rolling roller as in the prior art. Since there is no interference with the outer diameter of the tube, there are fewer parts to remove the resin coating in advance. Further, since the wear part of the automatic rounding mechanism and screw length adjusting mechanism is reduced, wear is reduced and reliability is improved. Further, since the outer diameter cutting portion of the pipe to be processed can be retracted to the side and rear of the head, it is not necessary to enlarge the threading device to be mounted.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a taper thread rolling head for pipes of the present invention.
FIG. 2 is a cross-sectional view taken along line BB in FIG.
FIG. 3 is an internal configuration diagram of an embodiment of a taper thread rolling head for pipes of the present invention.
4A and 4B are diagrams showing an embodiment of a taper thread rolling head for pipes according to the present invention, where FIG. 4A is a view taken along the arrow Z in FIG. 2, and FIG. is there.
FIG. 5 is a view for explaining the operation of the embodiment of the taper thread rolling head for pipe according to the present invention.
FIG. 6 is a front view showing a conventional taper thread rolling head for pipes.
7 is a cross-sectional view taken along line AA in FIG.
FIG. 8 is a view showing a state where a back cover of a conventional taper thread rolling head for a pipe is removed.
FIG. 9 is an exploded perspective view of a main part of a conventional taper thread rolling head for pipes.
FIG. 10 is a view for explaining the operation of a conventional taper thread rolling head for pipes.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 30 ... Housing 31 ... Screw rolling roller 32 ... Front cover 33 ... Back cover 34 ... Intermediate ring 35 ... Cam ring 36 ... Roller shaft 37 ... Bearing plate 38 ... Groove 39 ... Workpiece pipe 40 ... Metal 41 ... First lever 42 ... second lever 43 ... guide cylinder 44 ... roller 45 ... screw length adjusting screw 46 ... rod 47 ... arm 48 ... eccentric cam 49 ... hole 50 ... shaft 51 ... outer diameter cutting part support arm 52 ... outer diameter cutting part

Claims (3)

表蓋(32)と裏蓋(33)と、該表蓋(32)と裏蓋(33)とを結合する円筒状の中間部材(34)とよりなるハウジング(30)と、前記中間部材(34)の内側を回動するカムリング(35)と、中心にローラ軸(36)が挿通された複数個のねじ転造ローラ(31)と、前記ローラ軸(36)の両端をそれぞれ支持し、且つ表蓋(32)と裏蓋(33)の内側に放射状に形成された凹溝(38)に摺動可能に挿入された矩形板状の軸受板(37)とを具備し、前記軸受板(37)の長手方向の一方の辺は傾斜して形成されると共に該辺の近傍にピン(37b)が植設され、前記カムリング(35)の内側には前記軸受板(37)の傾斜面(37a)に対応して傾斜したカム面(35a)及び傾斜した長溝(35b)が形成され、該長溝(35b)に前記軸受板(37)に植設されたピン(37b)が係合してなり、前記カムリング(35)を回動させることによりねじ転造ローラ(31)がカムリング(35)の半径方向に移動し、
前記表蓋(32)の前部中央に被加工管(39)の外径を切削することができる外径切削部(52)が移動可能にアーム(51)により支持されて設けられ、該外径切削部(52)は、ハウジング(30)の側方に退避し、さらにその状態から後方に退避できるように前記アーム(51)に折れ曲り可能部が設けられて成ることを特徴とする管用テーパーねじ転造用ヘッド。
A housing (30) comprising a front cover (32), a back cover (33), and a cylindrical intermediate member (34) for joining the front cover (32) and the back cover (33), and the intermediate member ( 34) supporting a cam ring (35) rotating inside, a plurality of thread rolling rollers (31) having a roller shaft (36) inserted in the center, and both ends of the roller shaft (36), And a rectangular plate-like bearing plate (37) slidably inserted in a concave groove (38) formed radially inside the front lid (32) and the back lid (33), the bearing plate One side in the longitudinal direction of (37) is formed to be inclined, and a pin (37b) is planted in the vicinity of the side, and the inclined surface of the bearing plate (37) is provided inside the cam ring (35). (37a) corresponding to an inclined cam surface (35a) and an inclined long groove (35b) are formed, A pin (37b) implanted in the bearing plate (37) is engaged with the groove (35b), and the cam ring (35) is rotated to turn the thread rolling roller (31) into the cam ring (35). Move in the radial direction of
An outer diameter cutting portion (52) capable of cutting the outer diameter of the work tube (39) is movably supported by the arm (51) at the front center of the front cover (32). The diameter cutting portion (52) is retracted to the side of the housing (30), and further, the arm (51) is provided with a bendable portion so that it can be retracted rearward from the state . Tapered thread rolling head.
ねじ転造された被加工管(39)により押圧移動される当て金(40)と、該当て金(40)により回動される第1レバー(41)と、該第1レバー(41)により回動される第2レバー(42)と、該第2レバー(42)により押圧されて移動し、且つ、先端にローラ(44)を有し、後端にねじ長さ調節ねじ(45)を有するロッド(46)とが前記裏蓋(33)に設けられ、前記カムリング(35)に固定されて該カムリング(35)を回動させることができるアーム(47)と、該アーム(47)に設けられて前記ローラ(44)に接触する偏心カム(48)とを具備した自動切上げ兼ねじ長さ調整機構及びねじ径調整機構が設けられて成ることを特徴とする請求項1記載の管用テーパーねじ転造用ヘッド。  By means of a metal pad (40) that is pressed and moved by a thread-rolled tube (39), a first lever (41) that is rotated by the corresponding gold (40), and the first lever (41). The second lever (42) to be rotated, moved by being pressed by the second lever (42), and has a roller (44) at the front end and a screw length adjusting screw (45) at the rear end. A rod (46) having an arm (47) provided on the back cover (33), fixed to the cam ring (35) and capable of rotating the cam ring (35); and the arm (47) 2. The pipe taper according to claim 1, further comprising an automatic rounding and screw length adjusting mechanism and a screw diameter adjusting mechanism provided with an eccentric cam (48) provided and in contact with the roller (44). Screw rolling head. 前記第1レバー(41)が扇形をなし、所定角度回動すると当て金(40)との係合が離脱する安全機構が設けられて成ることを特徴とする請求項2記載の管用テーパーねじ転造用ヘッド。  The taper screw thread for pipes according to claim 2, wherein the first lever (41) has a sector shape and is provided with a safety mechanism that disengages from the stopper (40) when the first lever (41) rotates by a predetermined angle. Building head.
JP2001318422A 2001-10-16 2001-10-16 Tapered thread rolling head for pipes Expired - Lifetime JP3926130B2 (en)

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JP4484463B2 (en) * 2003-07-16 2010-06-16 レッキス工業株式会社 Tapered thread rolling head for self-releasing pipes
US10464119B2 (en) 2012-10-08 2019-11-05 Shanghai Pan-China Fastening System Co., Ltd. Rolling head for rolling pipe threads, apparatus and pipe column blank machined by the apparatus
CN103223453A (en) 2013-03-31 2013-07-31 上海泛华紧固系统有限公司 Method and device for directly rolling steel pipe standard outer diameter to form taper pipe external thread, and product of taper pipe external thread
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JP6732273B2 (en) 2016-12-13 2020-07-29 上海氾華緊固系統有限公司Shanghai Pan−China Fastening System Co.,Ltd. Pipe male screw rolling processing method, rolling head, equipment, module and pipe male screw production line and its products
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