JPH08117877A - Method for forming branch pipe and forming head - Google Patents

Method for forming branch pipe and forming head

Info

Publication number
JPH08117877A
JPH08117877A JP26039894A JP26039894A JPH08117877A JP H08117877 A JPH08117877 A JP H08117877A JP 26039894 A JP26039894 A JP 26039894A JP 26039894 A JP26039894 A JP 26039894A JP H08117877 A JPH08117877 A JP H08117877A
Authority
JP
Japan
Prior art keywords
pipe
branch
forming
head
mother
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.)
Granted
Application number
JP26039894A
Other languages
Japanese (ja)
Other versions
JP3489598B2 (en
Inventor
Yasuhiro Nonaka
康広 野中
Masayoshi Hashiura
雅義 橋浦
Hideaki Kikuchi
英明 菊地
Satoru Shirata
悟 白田
Sho Inagaki
捷 稲垣
Naohiro Tsukao
直弘 塚尾
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.)
Hitachi Setsubi Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Setsubi Engineering Co Ltd
Hitachi 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 Hitachi Setsubi Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Setsubi Engineering Co Ltd
Priority to JP26039894A priority Critical patent/JP3489598B2/en
Publication of JPH08117877A publication Critical patent/JPH08117877A/en
Application granted granted Critical
Publication of JP3489598B2 publication Critical patent/JP3489598B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces
    • B21C37/298—Forming collars by flow-drilling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

PURPOSE: To form branch pipe parts with a uniform thickness and high accuracy while preventing the formation of flaws on burring inside surfaces if the material of a base pipe is a soft material (aluminum alloy, etc.). CONSTITUTION: This forming head 1 is designed to move vertically and rotationally. The forming head 1 is circumferentially provided with plural bar- shaped pipe expanding pins 4 which project to incline at a sharp angle with the axis of rotation and are rotated by friction with the branch pipe forming inside surfaces (burring inside surfaces) of the base pipe 2 around the forming head 1. These pipe expanding pipes 4 successively expand the prepared holes 3 of the base pipe while collars 4a in contact with the branch pipes before rising of the branch pipes rotate along the burring inside surfaces at the time of expanding the prepared holes 3 of the base pipe 3. The final forming of the branch pipes is executed by the collars 4b in contact with the branch pipe parts at the time of rising of these parts. Since the respective collars rotate in correspondence to the contact state, the contact resistance is decreased and the flaws formed on the burring inside surfaces before rising of the branch pipes and at the time of rising are prevented and the thicknesses of the branch pipe parts are made uniform.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、母管に分岐管部を成形
加工する方法、特に母管の分岐部成形内面に傷の発生を
防止し、分岐管部分の肉厚を均一にする分岐管成形加工
方法及びそれに利用する成形ヘッドに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a branch pipe portion on a mother pipe, and more particularly to a branch pipe for preventing the occurrence of scratches on the inner surface of the mother pipe at the branched portion and for making the wall thickness of the branch pipe portion uniform. The present invention relates to a pipe forming method and a forming head used for the method.

【０００２】[0002]

【従来の技術】変電施設の一つであるガス絶縁開閉装置
は、母管から枝分かれした分岐部をそれぞれ連結した構
造となっており、母管同士を連結するために必要な分岐
部分を成形する方法としてバーリング加工が行なわれて
いる。2. Description of the Related Art A gas-insulated switchgear, which is one of substation facilities, has a structure in which branch portions branched from a mother pipe are connected to each other, and a branch portion required for connecting the mother pipes is formed. Burring is performed as a method.

【０００３】ここで、従来の技術におけるバーリング加
工方法を図８に示す。成形ヘッド３１を構成する拡管ピ
ン３２の形状が円形状あるいは楕円形状になっており、
成形ヘッド３１本体は昇降及び回転運動を行なう構造と
なっている。この成形ヘッドの昇降及び回転運動を制御
することによりバーリング加工を行なっており、成形ヘ
ッド３１を母管２の下穴３に挿入して、拡管ピン３２を
突き出させ回転させながら成形ヘッド３１を引き上げて
分岐管の成形を行なう。この公知例として、例えば特開
昭５７−１１５９２１号公報等がある。この加工方法に
よる場合、加工の際に摩擦摺動によってバーリング内面
に傷が発生しやすい。このため、バーリング内面と拡管
ピン３２との接触部分の摺動を円滑にするためにノズル
３７から潤滑剤を吐出供給することが行なわれている。
また、成形後は母管内面に潤滑剤が付着しているため洗
浄作業を行なっている。Here, a conventional burring method is shown in FIG. The shape of the pipe expanding pin 32 forming the molding head 31 is circular or elliptical,
The main body of the molding head 31 has a structure that moves up and down and rotates. Burring is performed by controlling the up-and-down movement and the rotational movement of the forming head, and the forming head 31 is inserted into the prepared hole 3 of the mother tube 2 and the expanding pin 32 is projected and rotated to pull up the forming head 31. To form a branch pipe. As a known example of this, there is, for example, JP-A-57-115921. With this processing method, scratches are likely to occur on the inner surface of the burring due to frictional sliding during processing. Therefore, in order to smooth the sliding of the contact portion between the inner surface of the burring and the tube expanding pin 32, the lubricant is discharged and supplied from the nozzle 37.
In addition, since the lubricant adheres to the inner surface of the mother pipe after the molding, cleaning work is performed.

【０００４】また、図９に示す加工方法は、母管２を母
管クランプ台３５に固定し、母管内部に円錐形状の加工
ヘッド３３を挿入し、母管下穴３より主軸３４を挿入し
て加工ヘッド３３に連結固定し、主軸３４により加工ヘ
ッド３３を回転させながら母管２より外部に引き抜くこ
とによりバーリング加工を行なっている。この公知例と
して特開昭５４−１３７４７２号公報がある。In the machining method shown in FIG. 9, the mother pipe 2 is fixed to the mother pipe clamp base 35, the conical machining head 33 is inserted into the mother pipe, and the main shaft 34 is inserted from the mother pipe prepared hole 3. Then, the burring process is performed by connecting and fixing it to the processing head 33 and pulling it out from the mother tube 2 while rotating the processing head 33 by the main shaft 34. As a known example of this, there is JP-A-54-137472.

【０００５】[0005]

【発明が解決しようとする課題】上記従来技術による加
工方法では、成形ヘッドにより回転駆動されている拡管
ピンまたは円錐形状拡管ヘッドとバーリング内面との接
触抵抗により、バーリング内面に傷が発生したり応力集
中により加工割れ３６が起き易かった。そのため、従来
の加工方法では、バーリング内面と拡管ピン等との接触
部分の摺動を円滑するためバーリング加工の際、潤滑剤
を吐出して傷の発生を防止していた。しかし、バーリン
グ加工を行なう母管の材質が軟材（アルミ合金材など）
である場合、従来の技術では加工が困難であり傷の発生
を防止することができず、また加工分岐管部分の真円度
も低く、精度が悪くて製品の品質上に問題があった。In the processing method according to the above-mentioned prior art, the inner surface of the burring is scratched or stressed due to the contact resistance between the inner surface of the burring and the expanding pin or the conical pipe expanding head which is rotationally driven by the forming head. Due to the concentration, processing cracks 36 were likely to occur. Therefore, in the conventional processing method, in order to smooth the sliding of the contact portion between the inner surface of the burring and the tube expanding pin, the lubricant is discharged during the burring processing to prevent the occurrence of scratches. However, the material of the mother tube for burring is soft material (such as aluminum alloy material).
In such a case, the conventional technique is difficult to process and it is not possible to prevent the occurrence of scratches, and the roundness of the processed branch pipe portion is low, resulting in poor accuracy and a problem in product quality.

【０００６】本発明の目的は、バーリング内面に発生す
る傷を防ぎ分岐管部分における板厚の均一化を図り、品
質を向上させることにある。An object of the present invention is to prevent scratches generated on the inner surface of the burring, to make the plate thickness uniform in the branch pipe portion, and to improve the quality.

【０００７】[0007]

【課題を解決するための手段】上記目的は、バーリング
内面と成形ヘッドとの接触摩擦抵抗を無くし傷の発生を
抑制するため、分岐管部分を成形するための回転または
公転する成形ヘッドのバーリング内面と接触する接触面
を接触摩擦力によって自転させながら加工するようにし
たことによって達成される。In order to eliminate the contact frictional resistance between the inner surface of the burring and the forming head and suppress the occurrence of scratches, the inner surface of the rotating or revolving forming head for forming the branch pipe portion is provided. This is accomplished by processing the contact surface that comes into contact with the object while rotating it by the contact frictional force.

【０００８】また、上記目的は、回転する成形ヘッドの
周りに回転軸と鋭角に傾斜して突出し母管のバーリング
内面との摩擦力により自転する複数の棒状の拡管ピンを
設けたことによって達成される。Further, the above-mentioned object is achieved by providing a plurality of rod-shaped expanding pins around the rotating molding head which project at an acute angle with respect to the rotation axis and which rotate by the frictional force with the inner surface of the burring of the mother tube. It

【０００９】また、上記目的は、公転する主軸中心に母
管のバーリング内面との摩擦力により自転する円錐形状
面を有する柱状の拡管ヘッドを設けたことによって達成
される。Further, the above object is achieved by providing a columnar pipe expanding head having a conical surface which rotates by the frictional force with the inner surface of the burring of the mother tube at the center of the revolving main shaft.

【００１０】また、上記目的は、回転する主軸により回
転駆動される径の異なる複数の分割拡管ヘッドを積重し
て数次段階加工を行なうようにしたことによって達成さ
れる。Further, the above object can be achieved by stacking a plurality of split tube-expanding heads having different diameters, which are rotationally driven by a rotating main shaft, so as to perform several-order stage processing.

【００１１】[0011]

【作用】上記本発明によれば、自転拡管ピンを用いるこ
とによって、バーリング内面との間の接触摩擦抵抗を減
少させることができるので、摩擦なしにバーリング加工
ができる。これによりバーリング内面に発生する傷を防
ぐことができ、製品の品質を向上させることができる。
また、母管の下穴を拡げていく際に、材料の伸び率が限
界を越えない範囲で母管の下穴を局部的に順次成形させ
ることにより、加工割れを防止することができる。ま
た、分岐管部分の真円度を向上させるために、最終成形
加工の際にスプリングバックを考慮した拡管ヘッド形状
とすることにより、高精度なバーリング加工が行なえ
る。また、潤滑剤を必要としないため加工後の洗浄作業
が不要となり、作業時間を短縮することができる。According to the present invention, since the contact friction resistance with the inner surface of the burring can be reduced by using the rotating expansion pin, the burring can be performed without friction. This can prevent scratches on the inner surface of the burring and improve the quality of the product.
Further, when the prepared hole of the mother tube is expanded, the prepared hole of the mother tube is locally and sequentially formed within the range in which the elongation rate of the material does not exceed the limit, so that work cracking can be prevented. In addition, in order to improve the roundness of the branch pipe portion, the pipe expanding head shape in consideration of the spring back at the time of the final forming process enables highly accurate burring process. Further, since no lubricant is required, the cleaning work after processing is unnecessary, and the working time can be shortened.

【００１２】[0012]

【実施例】以下、本発明の一実施例を図面に従って説明
する。変電施設の一つであるガス絶縁開閉装置は、完全
に密閉された圧力容器であり、分岐管部分の板厚が均一
でないと内部圧力などの影響により破損してしまう恐れ
がある。したがって、圧力容器の分岐管部分には傷など
による板厚の減少があってはならない。そこで、実施例
は分岐管部分の板厚を均一に成形できる管のバーリング
加工方法及びそれに使用する成形ヘッドについて説明す
る。An embodiment of the present invention will be described below with reference to the drawings. The gas-insulated switchgear, which is one of the substation facilities, is a completely sealed pressure vessel, and if the thickness of the branch pipe portion is not uniform, it may be damaged due to the influence of internal pressure. Therefore, the branch pipe portion of the pressure vessel must not have a decrease in plate thickness due to scratches or the like. Therefore, in this embodiment, a burring method of a pipe and a molding head used therefor capable of uniformly forming the plate thickness of the branch pipe portion will be described.

【００１３】図１に成形ヘッド１の拡管ピン４の構造及
び分岐管成形時の状態図を示す。本実施例による拡管ピ
ン４を用いたバーリング加工装置は、従来の技術同様、
成形ヘッド本体１が昇降及び回転運動を行なう構造とな
っている。しかし、拡管ピン４は、成形ヘッド１の周り
に回転軸と鋭角に突出した複数の棒状体で、母管２の下
穴３を拡管する際に、分岐管の立上り前に接触するカラ
ー４ｂがバーリング内面に沿って自転しながら母管の下
穴を拡げていき（ｂ）、分岐管部分の立上り時には先端
部のカラー４ａが接触して自転しながら分岐管の最終成
形を行なう（ａ）。この様に拡管ピン４には互に独立し
て自転するカラー４ａ，４ｂを有し、分岐管部分の内面
に沿って自転させることにより接触摩擦抵抗を減少させ
ることができる。図において、５はスラストベアリン
グ、６はラジアルベアリング、７はナットである。FIG. 1 shows a structure of the expanding pin 4 of the molding head 1 and a state diagram at the time of molding a branch pipe. The burring machine using the pipe expanding pin 4 according to this embodiment is similar to the conventional technology.
The molding head body 1 has a structure that moves up and down and rotates. However, the pipe expanding pin 4 is a plurality of rod-shaped members that project around the molding head 1 at an acute angle to the rotation axis, and when the pilot hole 3 of the mother pipe 2 is expanded, the collar 4b that comes into contact before the branch pipe rises. The prepared hole of the mother pipe is expanded while rotating along the inner surface of the burring (b), and at the time of rising of the branch pipe portion, the collar 4a at the tip portion comes into contact with the branch pipe to perform final molding of the branch pipe while rotating (a). As described above, the pipe expanding pin 4 has the collars 4a and 4b that rotate independently of each other, and the contact frictional resistance can be reduced by rotating along the inner surface of the branch pipe portion. In the figure, 5 is a thrust bearing, 6 is a radial bearing, and 7 is a nut.

【００１４】また、傷の発生は分岐管の立上り時に多く
見られるため、特に拡管ピン４の先端部分を独立した短
いカラー４ａに分割し、独立して支持軸にベアリング結
合することによって分岐管の内面に沿って自転させ易く
摩擦抵抗を軽減する構造とした。これによって、分岐管
の立上り時に発生する傷を確実に抑制させることができ
る。分岐管の立上り時以外に発生する傷に対しては、拡
管ピン４のカラー部分を複数（４ｂ…）に分割させるこ
とによって、それぞれのカラーが接触状態に対応して独
立した自転をするので、分岐管の立上り前及び立上り時
においてバーリング内面に発生する傷を防止することが
でき、かつ分岐管部分の板厚を均一に成形することがで
きる。Since the occurrence of scratches is often seen at the time of rising of the branch pipe, in particular, the tip end portion of the pipe expanding pin 4 is divided into independent short collars 4a and the bearing shafts are independently connected to the support shaft to form a branch pipe. It has a structure that easily rotates along the inner surface and reduces frictional resistance. As a result, it is possible to reliably suppress the damage that occurs when the branch pipe rises. With respect to scratches that occur when the branch pipe is not rising, by dividing the collar portion of the pipe expanding pin 4 into a plurality (4b ...), each collar rotates independently in response to the contact state. It is possible to prevent scratches occurring on the inner surface of the burring before and when the branch pipe rises, and it is possible to uniformly form the plate thickness of the branch pipe portion.

【００１５】また、本実施例では２分割方式（４ａ，４
ｂ）による自転拡管ピン４について述べているが、分岐
管の径によっては自転拡管ピン４のカラー部分をさらに
多くに分割する必要がある。また、分割カラーにより成
形ヘッドの回転負荷抵抗を小さくすることができるの
で、また自転拡管ピン４の個数も分岐管の径等によって
変更させる。Further, in this embodiment, the two-division method (4a, 4
Although the rotation expanding pin 4 according to b) is described, the collar portion of the rotation expanding pin 4 needs to be divided into more parts depending on the diameter of the branch pipe. Further, since the rotational load resistance of the molding head can be reduced by the divided collars, the number of the rotation expanding pipe pins 4 is also changed according to the diameter of the branch pipe and the like.

【００１６】次に、本発明による自転拡管ピン４を用い
たバーリング加工方法について説明する。図２は本発明
によるバーリング加工方法の一実施例で、母管２に空け
られた下穴３に成形ヘッド１を挿入する（ａ）。挿入時
には拡管ピン４は成形ヘッド１本体内に入っていて、挿
入後、拡管ピン４を突き出させ（ｂ）、成形ヘッド１を
回転させながら母管２により外に引き抜いてバーリング
加工を行なう（ｃ）（ｄ）。このとき、自転拡管ピン４
と分岐管内面との間では接触摩擦抵抗が減少しているの
で潤滑剤を吐出する必要はなく、傷の発生がなく、肉厚
を均一に真円度を高く高精度の分岐部成形ができる。Next, a burring method using the rotary expansion pin 4 according to the present invention will be described. FIG. 2 shows an embodiment of the burring method according to the present invention, in which the molding head 1 is inserted into the prepared hole 3 formed in the mother tube 2 (a). At the time of insertion, the pipe expanding pin 4 is inside the main body of the molding head 1. After the insertion, the pipe expanding pin 4 is projected (b), and while the molding head 1 is rotated, it is pulled out by the mother pipe 2 to perform burring (c). ) (D). At this time, the rotation expanding pin 4
Since the contact frictional resistance between the pipe and the inner surface of the branch pipe is reduced, it is not necessary to discharge the lubricant, no scratch is generated, the wall thickness is uniform, and the roundness can be formed with high precision. .

【００１７】次に、本発明の他の実施例のバーリング加
工方法及びそれに使用する成形ヘッドについて説明す
る。図３は自転拡管ピン８の構造及び分岐管成形時の状
態図を示す。図３の（ａ）は平面図、（ｂ）は側断面図
である。成形ヘッド本体は回転運転することなく主軸９
がＸ−Ｙの平面上を公転運転する構造となっており、こ
の主軸９に円錐形状面を有する柱状の拡管ヘッド８が自
転可能にベアリング１０支持されている。１１は固定ナ
ットである。母管２の下穴３を拡管する際、主軸９は下
穴中心より編心した公転運動を行ない、この公転運動の
範囲を拡げていきながら主軸９を引き上げることにより
バーリング加工を行なう。バーリング加工時、拡管ヘッ
ド８は母管内面との摩擦力を受け自転する構造であるた
め、加工時における母管内面との接触摩擦抵抗を減少さ
せることができる。Next, a burring method and a molding head used therefor according to another embodiment of the present invention will be described. FIG. 3 shows a structure of the rotation expanding pin 8 and a state diagram at the time of forming the branch pipe. 3A is a plan view and FIG. 3B is a side sectional view. The forming head body does not rotate and the main shaft 9
Has a structure in which it revolves around an XY plane, and a columnar pipe expanding head 8 having a conical surface is rotatably supported by a bearing 10 on the main shaft 9. Reference numeral 11 is a fixing nut. When expanding the pilot hole 3 of the mother tube 2, the main shaft 9 makes an orbital motion centered from the center of the pilot hole, and the main shaft 9 is pulled up while expanding the range of this orbital motion to perform burring. At the time of burring, the pipe expanding head 8 has a structure which rotates by receiving a frictional force with the inner surface of the mother tube, so that the contact friction resistance with the inner surface of the mother tube at the time of working can be reduced.

【００１８】図４にその加工方法を示す。母管２に空け
られた下穴３に柱状拡管ヘッド８を挿入し（ａ）、主軸
９をＺ方向に送りながらＸ−Ｙの平面上を公転させる
（ｂ，ｃ，ｄ）。このとき、拡管ヘッド８は円錐形状面
と母管内面との摩擦力により自転しながらバーリング加
工を行ない、加工完了により引抜き上昇する（ｅ）。こ
の場合も接触摩擦抵抗の減少によって高精度の分岐管成
形ができる。FIG. 4 shows the processing method. The columnar tube expanding head 8 is inserted into the prepared hole 3 formed in the mother tube 2 (a), and the spindle 9 is revolved on the XY plane while feeding in the Z direction (b, c, d). At this time, the tube expanding head 8 performs burring processing while rotating by the frictional force between the conical surface and the inner surface of the mother tube, and pulls up when the processing is completed (e). Also in this case, highly accurate branch pipe molding can be performed by reducing the contact friction resistance.

【００１９】図５は、本発明のさらに他の実施例成形ヘ
ッドを示し、成形ヘッド１２は一次拡管用ヘッド１３・
二次拡管用ヘッド１４・（ｎ次拡管用ヘッド…）・最終
拡管ヘツド１５を順次積重して形成されており、それぞ
れの拡管ヘッドにより母管２の下穴３を局部的に順次数
次段階で拡げていき、最終拡管ヘッド１５により分岐管
部分の最終バーリング加工を行なう。また、一次拡管用
ヘッド１３・二次拡管用ヘッド１４・（ｎ次拡管用ヘッ
ド…）の形状は、それぞれ長円形状、最終拡管ヘッド１
５は、楕円形状となっている。なお、図５の（ａ）は側
断面、（ｂ）は正面図、（ｃ）は平面図である。FIG. 5 shows a molding head according to still another embodiment of the present invention, in which the molding head 12 is a primary pipe expanding head 13.
The secondary pipe expanding head 14, the (n-th pipe expanding head ...), and the final pipe expanding head 15 are sequentially stacked and formed, and the pilot holes 3 of the mother pipe 2 are locally and sequentially formed by each pipe expanding head. The diverging is performed in stages, and the final blasting head 15 performs the final burring process on the branch pipe portion. Further, the shapes of the primary pipe expanding head 13, the secondary pipe expanding head 14, and the (n-th pipe expanding head ...) are oval and the final pipe expanding head 1 is the same.
5 has an elliptical shape. 5A is a side cross-sectional view, FIG. 5B is a front view, and FIG. 5C is a plan view.

【００２０】図６に本実施例による加工方法を示し、ま
た、図７に下穴の加工状態および加工ヘッドの状態を示
す。下穴３加工された母管２をセッティング台１７に固
定し、母管２の内部にマテハン１８によって加工ヘッド
１２を挿入する（ａ）。主軸１６を下穴３から挿入し加
工ヘッド１２に結合固定する（ｂ）。しかる後、主軸１
６を回転し、母管内部から外への引き抜き運動を与え
（ｃ）、一次拡管ヘッド１３、二次拡管用ヘッド１４、
…による加工を順次段階的に行なう（ｄ）。最終加工は
分岐管部分を拘束しながら、楕円形状になっている最終
拡管ヘッド１５を引き抜きバーリング加工を完了する
（ｅ）。FIG. 6 shows a working method according to this embodiment, and FIG. 7 shows a working state of a prepared hole and a working head. The mother pipe 2 processed by the pilot hole 3 is fixed to the setting table 17, and the machining head 12 is inserted into the mother pipe 2 by the material handling 18 (a). The main shaft 16 is inserted from the prepared hole 3 and fixed to the machining head 12 (b). After that, spindle 1
6 is rotated to give a pulling motion from the inside of the mother tube to the outside (c), the primary pipe expanding head 13, the secondary pipe expanding head 14,
.. are sequentially processed step by step (d). In the final processing, the elliptical final expansion head 15 is pulled out while restraining the branch pipe portion, and the burring processing is completed (e).

【００２１】このように径の異なる一次拡管ヘッド１
３、二次拡管用ヘッド１４、ｎ次拡管ヘッド、及び最終
拡管ヘッド１５を順次外径が大きくなるよう積重した加
工ヘッド２１により、母管下穴３を局部的に順次数次段
階的に拡大して加工し、最終的に所要寸法形状に加工す
ることによって、材料の伸び率が限界を越えない範囲で
加工でき、割れを発生させないで加工できる。Primary expansion heads 1 having different diameters as described above
3, the secondary pipe expanding head 14, the n-th pipe expanding head, and the final pipe expanding head 15 are sequentially stacked in order of increasing outer diameter by the processing head 21 to locally and sequentially form the master pipe prepared hole 3 in several steps. By expanding and working, and finally working into the required size and shape, it is possible to work within the range where the elongation rate of the material does not exceed the limit, and it is possible to work without causing cracks.

【００２２】また、母管２の下穴３の加工状態は図７に
示すように始め楕円形（ａ）、（ｂ）であるが、一次拡
管ヘッド１３により楕円中央部分が膨らむように加工さ
れ（ｃ）、次に二次拡管ヘッド１４により更に膨らまさ
れ（ｄ）、数次段階加工により次第に円形加工され、最
終的に拡管ヘッド１５により円形に加工される（ｂ）。
一次拡管ヘッド１３、二次拡管ヘッド１４等の前加工ヘ
ッドは加工面が長円形状に形成されているから、長軸面
で母管２の下穴部分が少しづつしごくように拡大され、
数次段階で順次拡管され、摩擦力を少なく小さい力で無
理なく成形されるから傷、割れを防止した加工が行なわ
れ、最終拡管ヘッド１５では楕円形状面で真円成形され
る。この最終拡管ヘッド１５の楕円は、短軸長がφｄの
とき長軸長はφｄ＋φｄ×０．３％程度の楕円形状にす
ることによって、スプリングバックを考慮した真円度の
高い高精度のバーリング加工をすることができる。The prepared state of the pilot hole 3 of the mother tube 2 is initially elliptical (a) or (b) as shown in FIG. 7, but is processed by the primary expansion head 13 so that the central part of the ellipse swells. (C) Next, it is further expanded by the secondary pipe expanding head 14 (d), gradually circularly processed by several stages of processing, and finally circularly processed by the pipe expanding head 15 (b).
The pre-processing heads such as the primary pipe expanding head 13 and the secondary pipe expanding head 14 have the machining surfaces formed in an oval shape, so that the prepared hole portion of the mother pipe 2 is gradually enlarged in the major axis surface,
The pipes are successively expanded in several stages, and are easily molded with a small friction force and a small force, so that processing is performed to prevent scratches and cracks, and the final pipe expanding head 15 is formed into a perfect circle with an elliptical surface. The final pipe expanding head 15 has an elliptical shape in which the major axis length is about φd + φd × 0.3% when the minor axis length is φd, so that a high-precision burring process with high roundness considering springback is performed. You can

【００２３】[0023]

【発明の効果】以上のように本発明によれば、バーリン
グ内面と成形ヘッドとの間の接触摩擦抵抗が減少するの
で、母管の材質が軟材（アルミ合金材など）であって
も、バーリング内面を傷付けたりすることなく分岐管部
分を高精度に成形することができ、製品の品質向上がで
きる。また成形ヘッドの回転負荷抵抗が小さくなり駆動
部を小型化ができる。また、バーリンク加工部に潤滑剤
を供給する必要がないので、作業効率を向上させること
ができる。As described above, according to the present invention, since the contact frictional resistance between the inner surface of the burring and the molding head is reduced, even if the material of the mother tube is a soft material (such as an aluminum alloy material), The branch pipe can be molded with high precision without damaging the inner surface of the burring, and the quality of the product can be improved. Further, the rotational load resistance of the molding head is reduced, and the drive unit can be downsized. Moreover, since it is not necessary to supply the lubricant to the bar link processing portion, the work efficiency can be improved.

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

【図１】本発明の一実施例成形ヘッドの構造及び分岐管
成形時の状態図である。FIG. 1 is a structure diagram of a molding head according to an embodiment of the present invention and a state diagram at the time of branch pipe molding.

【図２】本発明の一実施例バーリング加工方法の説明図
である。FIG. 2 is an explanatory diagram of a burring method according to an embodiment of the present invention.

【図３】本発明の他の実施例成形ヘッドの構造及び分岐
管成形時の状態図である。FIG. 3 is a structure diagram of a molding head according to another embodiment of the present invention and a state diagram at the time of molding a branch pipe.

【図４】本発明の他の実施例バーリング加工方法の説明
図である。FIG. 4 is an explanatory view of a burring method according to another embodiment of the present invention.

【図５】本発明の他の実施例成形ヘッドの構成図であ
る。FIG. 5 is a configuration diagram of a molding head according to another embodiment of the present invention.

【図６】本発明の他の実施例バーリング加工方法の説明
図である。FIG. 6 is an explanatory diagram of a burring method according to another embodiment of the present invention.

【図７】図６の補足説明図である。FIG. 7 is a supplementary explanatory diagram of FIG.

【図８】従来のバーリング加工方法の説明図である。FIG. 8 is an explanatory diagram of a conventional burring method.

【図９】従来の他のバーリング加工方法の説明図であ
る。FIG. 9 is an explanatory diagram of another conventional burring method.

【符号の説明】[Explanation of symbols]

１…成形ヘッド、２…母管、３…下穴、４…拡管ピン、
４ａ、４ｂ…分割カラー、５、６…ベアリング、７…ナ
ット、８…拡管ヘッド、９…主軸、１２…加工ヘッド、
１３…一次拡管ヘッド、１４…二次拡管ヘッド、１５…
最終拡管ヘッド、１６…主軸。1 ... Molding head, 2 ... Mother tube, 3 ... Prepared hole, 4 ... Expansion pin,
4a, 4b ... Split collars, 5, 6 ... Bearings, 7 ... Nuts, 8 ... Tube expanding heads, 9 ... Spindles, 12 ... Machining heads,
13 ... Primary tube expanding head, 14 ... Secondary tube expanding head, 15 ...
Final tube expansion head, 16 ... Spindle.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 菊地 英明 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 白田 悟 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 稲垣 捷 茨城県日立市国分町一丁目１番１号 株式 会社日立製作所国分工場内 (72)発明者 塚尾 直弘 茨城県日立市会瀬町二丁目９番１号 日立 設備エンジニアリング株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideaki Kikuchi 1-1-1, Kokubun-cho, Hitachi-shi, Ibaraki Hitachi Kokubun factory (72) Inventor Satoru Shirata 1-1-Kokubun-cho, Hitachi-shi, Ibaraki No. 1 Inside the Kokubun Plant of Hitachi, Ltd. (72) Inventor Kage Inagaki 1-1-1 Kokubun-cho, Hitachi City, Ibaraki Prefecture Inside the Kokubun Plant of Hitachi, Ltd. (72) Naohiro Tsukao 2-chome, Aise-cho, Hitachi City, Ibaraki Prefecture No. 9-1 within Hitachi Equipment Engineering Co., Ltd.

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 母管の下穴に成形ヘッドを挿入し、該成
形ヘッドの主軸回転と母管内部から外部への引き抜きに
よって分岐部の成形加工を行なう分岐管成形加工方法に
おいて、上記成形ヘッドの母管分岐部成形内面と接触す
る接触面を接触摩擦力により自転させながら加工するよ
うにしたことを特徴とする分岐管成形加工方法。1. A branch pipe forming method, wherein a forming head is inserted into a prepared hole of a mother tube, and a branch portion is formed by rotating the forming head on a main shaft and pulling it out from the inside of the mother tube. The branch pipe forming method, wherein the contact surface that comes into contact with the forming inner surface of the mother pipe branch portion is processed while rotating by a contact friction force. 【請求項２】 母管の下穴に成形ヘッドを挿入し、該成
形ヘッドの公転と母管内部から外部への引き抜きによっ
て分岐部の成形加工を行なう分岐管成形加工方法におい
て、上記成形ヘッドの母管分岐部成形内面と接触する接
触面を接触摩擦力により自転させながら加工するように
したことを特徴とする分岐管成形加工方法。2. A branch pipe forming method in which a forming head is inserted into the prepared hole of the mother pipe, and the branch portion is formed by revolving the forming head and pulling it out from the inside of the mother pipe. A method for forming a branched pipe, characterized in that a contact surface that comes into contact with an inner surface of the mother pipe branching portion is rotated while being rotated by a contact frictional force. 【請求項３】 母管の下穴に挿入し、主軸回転と母管内
部から外部への引き抜きによって分岐部の成形加工を行
なう分岐管成形ヘッドにおいて、上記回転する主軸の周
りに軸と鋭角に傾斜して突出し母管分岐部成形内面との
摩擦力により自転する複数の棒状の拡管ピンを設けたこ
とを特徴とする分岐管成形ヘッド。3. A branch pipe forming head, which is inserted into a prepared hole of a mother pipe and performs a forming process of a branch portion by rotating the main shaft and pulling it out from the inside of the mother pipe, wherein an acute angle is formed around the rotating main shaft. A branch pipe forming head comprising a plurality of rod-shaped pipe expanding pins which are inclined and protrude to rotate by a frictional force with an inner surface of a mother pipe branch forming portion. 【請求項４】 互に独立して自転する分割カラーを有す
る拡管ピンを設けたことを特徴とする請求項３記載の分
岐管成形ヘッド。4. The branch pipe molding head according to claim 3, further comprising a pipe expanding pin having a split collar that rotates independently of each other. 【請求項５】 母管の下穴に挿入し、主軸の公転と母管
内部から外部への引き抜きによって分岐部の成形加工を
行なう分岐管成形ヘッドにおいて、上記公転する主軸を
中心に母管分岐部成形内面との摩擦力により自転する円
錐形状面を有する柱状の拡管ヘッドを設けたことを特徴
とする分岐管成形ヘッド。5. A branch pipe forming head, which is inserted into a prepared hole of a mother pipe to revolve the main shaft and to form a branched portion by drawing from the inside of the mother pipe to the outside, in which the mother pipe is branched around the revolving main shaft. A branch pipe forming head, characterized in that a columnar pipe expanding head having a conical surface that rotates by friction with the inner surface of the partial pipe is provided. 【請求項６】 母管の下穴に挿入し、主軸回転と母管内
部から外部への引き抜きによって分岐部の成形加工を行
なう分岐管成形ヘッドにおいて、回転する主軸により回
転駆動される径の異なる複数の分割拡管ヘッドを積重し
て数次段階加工するようにして成ることを特徴とする分
岐管成形ヘッド。6. A branch pipe forming head, which is inserted into a prepared hole of a mother pipe to form a branched portion by rotating the main shaft and pulling it out from the inside of the mother pipe, and has different diameters driven to rotate by the rotating main shaft. A branch pipe forming head, characterized in that a plurality of divided pipe expanding heads are stacked and processed in several stages. 【請求項７】 上記複数の分割拡管ヘッドは、楕円形状
のもの、長円形状のもの、またはその組合せとしたこと
を特徴とする請求項６記載の分岐管成形ヘッド。7. The branch pipe forming head according to claim 6, wherein the plurality of split pipe expanding heads are elliptical, oval, or a combination thereof.
JP26039894A 1994-10-25 1994-10-25 Branch pipe forming method and forming head Expired - Fee Related JP3489598B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26039894A JP3489598B2 (en) 1994-10-25 1994-10-25 Branch pipe forming method and forming head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26039894A JP3489598B2 (en) 1994-10-25 1994-10-25 Branch pipe forming method and forming head

Publications (2)

Publication Number Publication Date
JPH08117877A true JPH08117877A (en) 1996-05-14
JP3489598B2 JP3489598B2 (en) 2004-01-19

Family

ID=17347370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26039894A Expired - Fee Related JP3489598B2 (en) 1994-10-25 1994-10-25 Branch pipe forming method and forming head

Country Status (1)

Country Link
JP (1) JP3489598B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100426205B1 (en) * 2001-06-18 2004-04-28 주식회사 대호기공 rollers of connection pipes forming apparatus
US7219933B2 (en) 2000-06-02 2007-05-22 Toyota Jidosha Kabushiki Kaisha Hollow product, fluid processing system and joining method of hollow members
EP1869297B1 (en) * 2005-04-15 2011-03-23 EMCON Technologies LLC Spun extrusion side entry muffler
JP2012055965A (en) * 2010-09-13 2012-03-22 Osamu Sugisawa Drum can re-curling machine
CN114833247A (en) * 2021-02-02 2022-08-02 偃师东方管件有限公司 Production process of hydrogenation mixer tee joint
US11415031B2 (en) * 2017-07-21 2022-08-16 Bosal Emission Control Systems Nv Method for forming a collar in a muffler housing

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7219933B2 (en) 2000-06-02 2007-05-22 Toyota Jidosha Kabushiki Kaisha Hollow product, fluid processing system and joining method of hollow members
KR100426205B1 (en) * 2001-06-18 2004-04-28 주식회사 대호기공 rollers of connection pipes forming apparatus
EP1869297B1 (en) * 2005-04-15 2011-03-23 EMCON Technologies LLC Spun extrusion side entry muffler
JP2012055965A (en) * 2010-09-13 2012-03-22 Osamu Sugisawa Drum can re-curling machine
US11415031B2 (en) * 2017-07-21 2022-08-16 Bosal Emission Control Systems Nv Method for forming a collar in a muffler housing
CN114833247A (en) * 2021-02-02 2022-08-02 偃师东方管件有限公司 Production process of hydrogenation mixer tee joint

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