JPH10314837A - Helical deformed tube, method for forming and device therefor - Google Patents
Helical deformed tube, method for forming and device thereforInfo
- Publication number
- JPH10314837A JPH10314837A JP5690298A JP5690298A JPH10314837A JP H10314837 A JPH10314837 A JP H10314837A JP 5690298 A JP5690298 A JP 5690298A JP 5690298 A JP5690298 A JP 5690298A JP H10314837 A JPH10314837 A JP H10314837A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- pipe
- forming
- roll
- deformed
- 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.)
- Withdrawn
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、管軸方向に関して螺旋
状のウネリを付けた管壁をもつ異形管とその成形方法及
び成形装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deformed pipe having a pipe wall provided with undulation spiraled in the pipe axis direction, and a method and apparatus for forming the same.
【0002】[0002]
【従来の技術】意匠性,識別性を付与した異形管とし
て、円周方向に凹凸を付けた管壁をもつ異形管が一部で
使用されている。管壁の凹凸は、配管用途等では流路抵
抗を調節する役目も果たす。管壁に凹凸を付けた異形管
の製造には、生産性の良いことからロール成形法が一部
で採用されている。たとえば、管軸と平行な方向に延び
る凹部dを円周方向に関して8個設けた管壁tをもつ異
形管P(図1)をロール成形法で製造する場合、図2に
示すように所定のカリバーを付けた成形ロールr1 〜r
4 を四方に配置した成形スタンドを用い、成形ロールr
1 〜r4 で囲まれた成形空間Rに丸管等の素管を送り込
んでいる。このとき、異形管Pの管軸方向に延びた凹部
dを形成することから、各成形ロールr1 〜r4 の回転
軸を管軸に直交する方向に設定している。ところで、ニ
ーズが多様化する昨今、管軸と平行な凹部dを付けた異
形管では意匠性,識別性が薄くなってきている。また、
配管用途で使用する場合にも、異形管Pの内部を流れる
流体の流動方向に凹部dが延在するため、凹部dを形成
したにも拘らず予期する流路抵抗が得られないことがあ
る。このようなことから、管軸を中心とする螺旋状の凹
部dが管軸方向に成形されている異形管に対する要求が
ある。2. Description of the Related Art A deformed tube having a tube wall with irregularities in the circumferential direction is partially used as a deformed tube provided with design and distinctiveness. The unevenness of the pipe wall also plays a role of adjusting the flow path resistance in piping applications and the like. In the production of a deformed pipe having irregularities on the pipe wall, a roll forming method is partially adopted because of good productivity. For example, when manufacturing a deformed pipe P (FIG. 1) having a pipe wall t in which eight concave portions d extending in a direction parallel to the pipe axis are provided in the circumferential direction by a roll forming method, as shown in FIG. Forming rolls r 1 to r with caliber attached
Forming roll r using a forming stand with 4 arranged on all sides
And by feeding raw tube round tube or the like in the molding space R surrounded by 1 ~r 4. At this time, since the forming recesses d extending in the tube axis direction of the profiled pipe P, it is set to a direction orthogonal to the rotation axis of each forming roll r 1 ~r 4 to the tube axis. By the way, in recent years when needs are diversified, the design and the discriminability of a deformed pipe having a concave portion d parallel to the pipe axis have been reduced. Also,
Even when used in a piping application, since the recess d extends in the flow direction of the fluid flowing inside the deformed pipe P, an expected flow path resistance may not be obtained despite the formation of the recess d. . For this reason, there is a demand for a deformed pipe in which a helical recess d centered on the pipe axis is formed in the pipe axis direction.
【0003】[0003]
【発明が解決しようとする課題】螺旋状管壁をもつ異形
管を成形するためには、丸管の造管ラインの出側に専用
の成形スタンドを組み込んだインライン成形,造管ライ
ンで成形された丸管を別ラインで異形管に成形するオフ
ライン成形が考えられる。インライン成形では、少なく
とも2段以上の成形スタンドを配置し、上流側と下流側
とで管軸を中心として素管を相対的に回転させながら、
管壁を螺旋状に成形する必要がある。オフライン成形で
は、一旦管軸方向に平行な断面形状(図1)をもつ異形
管を生成した後、所定長さに切断した異形管を管軸方向
にねじることによって螺旋状異形管が製造される。すな
わち、インライン成形及びオフライン成形共に、管軸方
向に平行な断面形状をもつ異形管に直接ネジリを加える
ことにより、管軸方向に関して螺旋状に管壁を成形す
る。このような方法では、必要以上に工数が増加する。
また、異形管を直接ねじるために大掛かりな設備が必要
になるばかりでなく、表面処理を施した素管を使用する
場合等ではネジリに起因する表面損傷が発生する虞れも
ある。更には、溶接ビードも螺旋状になるため、異形管
を装飾部材として使用したとき表側に溶接ビードが来る
ことが避けられず、見映えを悪くする。In order to form a deformed pipe having a spiral pipe wall, it is formed by in-line molding or a pipe forming line incorporating a dedicated forming stand on the outlet side of a round pipe forming line. Off-line molding for forming a round pipe into a deformed pipe on a separate line is conceivable. In the in-line molding, at least two or more molding stands are arranged, and the base tube is relatively rotated around the tube axis on the upstream side and the downstream side,
The tube wall must be formed in a spiral shape. In off-line molding, a helical deformed pipe is manufactured by first forming a deformed pipe having a cross-sectional shape (FIG. 1) parallel to the pipe axis direction and then twisting the deformed pipe cut to a predetermined length in the pipe axis direction. . That is, in both in-line molding and off-line molding, a tube wall is formed in a spiral shape in the tube axis direction by directly applying a twist to a deformed tube having a cross-sectional shape parallel to the tube axis direction. In such a method, the number of steps increases more than necessary.
In addition, not only large-scale equipment is required for directly twisting the deformed pipe, but also in the case of using a surface-treated raw pipe, there is a possibility that surface damage due to torsion may occur. Furthermore, since the weld bead also has a spiral shape, it is inevitable that the weld bead comes to the front side when the deformed pipe is used as a decorative member, and the appearance is deteriorated.
【0004】[0004]
【課題を解決するための手段】本発明は、このような問
題を解消すべく案出されたものであり、管軸に直交する
面に対しロール回転軸を傾斜させることにより、大きな
設備変更を伴うことなく、管軸方向にうねった形状の管
壁をもつ異形管を得ることを目的とする。本発明の螺旋
状異形管は、その目的を達成するため、管軸を中心とす
る螺旋状のウネリが付けられた管壁をもち、管軸と平行
な方向に溶接ビードが延びていることを特徴とする。こ
の螺旋状異形管は、管軸に直交する面に対してロールシ
ャフトを傾斜させた成形ロールで素管を成形することに
より製造される。成形装置は、素管の周囲に複数の成形
ロールを配置し、個々の成形ロールを回転可能に支持す
るロールチョックとを備えている。ロールチョックに
は、管軸に直交する面に対して傾斜させてロールシャフ
トを支持するカラーが設けられている。SUMMARY OF THE INVENTION The present invention has been devised in order to solve such a problem, and a large equipment change can be made by inclining a roll rotation axis with respect to a plane perpendicular to a pipe axis. It is an object of the present invention to obtain a deformed pipe having a pipe wall undulating in the pipe axis direction without accompanying. In order to achieve the object, the spiral shaped pipe of the present invention has a pipe wall provided with a spiral undulation centered on the pipe axis, and has a weld bead extending in a direction parallel to the pipe axis. Features. This spiral shaped pipe is manufactured by forming a raw pipe with a forming roll in which a roll shaft is inclined with respect to a plane perpendicular to the pipe axis. The forming device includes a plurality of forming rolls arranged around the raw tube, and a roll chock rotatably supporting each forming roll. The roll chock is provided with a collar that supports the roll shaft while being inclined with respect to a plane perpendicular to the tube axis.
【0005】[0005]
【実施の形態】本発明に従った成形装置は、造管ライン
から独立して、或いは造管ラインに組み込んだ形態で使
用される。複雑形状の異形管を製造する場合には、目標
形状に応じて複数の成形スタンドを直列配置する。成形
スタンドを複数段配置するとき、各段の加工量が少なく
なることからロールに対する負荷が減少し、また良好な
形状精度での加工も可能になる。造管ラインから独立し
た成形装置は、たとえば図3に示すように成形スタンド
10の入側に押込み装置11を配置し、出側に矯正スタ
ンド12を配置する。押込み装置11は、油圧シリンダ
13に設けられているチャック(図示せず)で丸管P0
(素管)を把持し、成形スタンド10に丸管P0 を押し
込む。成形スタンド10で丸管P0 が成形されている
間、丸管P0 を回転可能に支持するためのベアリング1
4が油圧シリンダ13に設けられている。管軸方向にう
ねった形状に管壁が成形された異形管Pは、成形スタン
ド10から送り出された後、矯正スタンド12で形状修
正される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A molding apparatus according to the present invention is used independently of a pipe production line or in a form incorporated in a pipe production line. When manufacturing a deformed tube having a complicated shape, a plurality of molding stands are arranged in series according to a target shape. When the forming stand is arranged in a plurality of stages, the amount of processing in each stage is reduced, so that the load on the roll is reduced, and the processing can be performed with good shape accuracy. For example, as shown in FIG. 3, the molding device independent of the pipe-making line has a pushing device 11 disposed on the entrance side of the molding stand 10 and a correction stand 12 disposed on the exit side. The pushing device 11 uses a chuck (not shown) provided on the hydraulic cylinder 13 to rotate the round pipe P 0.
(Primary tube) is gripped and the round tube P 0 is pushed into the molding stand 10. While round tubes P 0 in the molding station 10 is molded, the bearing 1 for rotatably supporting a round tube P 0
4 is provided on the hydraulic cylinder 13. The deformed pipe P in which the pipe wall is formed in a undulating shape in the pipe axis direction is sent out from the forming stand 10 and then corrected in shape by the correction stand 12.
【0006】造管ラインに組み込まれたインライン型の
成形装置は、たとえば図4に示すように造管機15の出
側に成形スタンド10を配置している。ペイオフリール
16から払い出された素板Sは、造管機15で丸管P0
に造管された後、成形スタンド10に送り込まれる。こ
の場合、丸管P0 の回転が許されない条件下で成形され
ることから、成形スタンド10をベアリング14で支持
し、成形スタンド10自体を回転させる方式が採用され
る。成形スタンド10で管壁が螺旋状に成形された異形
管Pは、矯正スタンドを経て送り出される。[0006] In an in-line type molding apparatus incorporated in a pipe forming line, for example, as shown in FIG. The blank S paid out from the payoff reel 16 is rounded by the tube forming machine 15 into a round tube P 0.
After that, it is sent to the molding stand 10. In this case, since the rotation of the round pipe P 0 is molded under conditions which are not allowed, the shaped stand 10 is supported by bearings 14, a method of rotating is adopted molded stand 10 itself. The deformed pipe P whose pipe wall is formed in a spiral shape by the forming stand 10 is sent out through the straightening stand.
【0007】成形スタンド10は、図5に示すように、
目標とする異形管Pの断面形状に応じた個数の成形ロー
ル20,20・・を備えている。各成形ロール20を回
転可能に支持するロールチョック21は、円周方向に等
間隔でスタンドフレーム22に設けられ、圧下スクリュ
ー23によって中心方向に付勢される。ロールチョック
21には、図6に示すように成形ロール20を収容する
空間部24が形成されており、成形ロール20のロール
シャフト25が嵌め込まれるカラー26が設けられてい
る。カラー26は、成形中の丸管P0 の管軸方向に対し
て成形ロール20が傾くように、傾斜角度θを付けてロ
ールチョック21に取り付けられている。傾斜角度θ
は、異形管Pの管壁に付ける螺旋のピッチに応じて適宜
の角度に設定される。ただし、あまり大きな傾斜角度θ
で成形ロール20を装着すると、成形ロール20の回転
や素管P0 又は異形管Pの走行ができなくなるので、4
5度以下の傾斜角度θに設定される。[0007] As shown in FIG.
The number of forming rolls 20, 20,... According to the cross-sectional shape of the target deformed pipe P is provided. Roll chocks 21 rotatably supporting each forming roll 20 are provided on a stand frame 22 at equal intervals in a circumferential direction, and are urged in the center direction by a screw down screw 23. As shown in FIG. 6, the roll chock 21 has a space 24 for accommodating the forming roll 20, and is provided with a collar 26 into which a roll shaft 25 of the forming roll 20 is fitted. The collar 26 is attached to the roll chock 21 at an inclination angle θ so that the forming roll 20 is inclined with respect to the tube axis direction of the round tube P 0 being formed. Tilt angle θ
Is set at an appropriate angle in accordance with the pitch of the helix attached to the tube wall of the deformed tube P. However, too large inclination angle θ
When the forming roll 20 is mounted in the above, the rotation of the forming roll 20 and the running of the raw tube P 0 or the deformed tube P cannot be performed.
The inclination angle θ is set to 5 degrees or less.
【0008】回転軸が傾けられた成形ロール20,20
・・は、図5(a)に示すように素管P0 の周囲に複数
個配置される。たとえば、円周方向に8個の凹凸を付け
た異形管Pを製造する場合には、8個の成形ロール2
0,20・・を円周方向に等間隔で配置する。各成形ロ
ール20は、図7(a)に示すように素管P0 に押し当
てられ、成形ロール20のプロフィールに対応した形状
に素管P0 を成形する。その結果、図7(b)に示すよ
うに凹部dが管軸方向に関して螺旋状にうねった管壁t
をもつ異形管Pが製造される。[0008] Forming rolls 20, 20 whose rotation axes are inclined.
... is a plurality disposed around the base pipe P 0 as shown in Figure 5 (a). For example, when manufacturing a deformed pipe P having eight irregularities in the circumferential direction, eight forming rolls 2
Are arranged at equal intervals in the circumferential direction. Each forming roll 20 is pressed against the base tube P 0 as shown in FIG. 7A to form the base tube P 0 into a shape corresponding to the profile of the forming roll 20. As a result, as shown in FIG. 7 (b), the concave portion d has a tube wall t spirally undulating in the tube axis direction.
Is produced.
【0009】得られた異形管Pは、素管P0 をねじるこ
となく、素管P0 の管壁tを塑性変形したものであるた
め、素管P0 に損傷を与えることなく、形状安定性に優
れている。因みに、素管P0 をねじりながら成形した異
形管では、ネジリによるモーメントが応力となって異形
管Pに残留し、異形管Pを変形させる原因になりやす
い。また、表面処理鋼板から作られた素管P0 を成形す
る場合には、めっき層等に欠陥を発生させ、或いは密着
性を低下させる原因となる。造管工程で形成された溶接
ビードwは、素管P0 をねじりながら成形した異形管と
異なり、螺旋状になることなく管軸方向と平行に延びて
いる。そのため、たとえば装飾用建材として使用する場
合等においては、溶接ビードwがある面を裏側に配置す
ることによって、意匠性,識別性の高い施工ができる。[0009] The resulting variant pipe P without twisting the base pipe P 0, since the tube wall t of the base pipe P 0 is obtained by plastic deformation, without damaging the base tube P 0, shape stability Excellent in nature. Incidentally, the profiled tube was molded twisting the base pipe P 0, remaining deformed pipe P by the moment due to torsion is a stress, likely to cause deformation of the profiled pipe P. Further, in the case of forming the raw tube P 0 made of surface-treated steel sheet, plating layer or the like to generate a defective or causes a reduction in the adhesiveness. Weld bead w formed pipe making process, unlike the deformed tube shaped twisting the base pipe P 0, which extends parallel to the tube axis direction without being helically. For this reason, for example, when used as a decorative building material, by arranging the surface on which the weld bead w is located on the back side, it is possible to perform construction with high designability and distinctiveness.
【0010】プロフィールが異なる成形ロール20を使
用するとき、螺旋形状を種々異ならせた異形管を製造す
ることもできる。たとえば、成形ロール20としてフラ
ットロールを組み込んだ成形スタンド(図8a)では、
フラットロールのロール周面で丸管P0 が成形されるの
で、得られた異形管Pには平坦面fが形成される(図8
b)。平坦面fも、図7の異形管Pと同様に、管軸方向
に螺旋状にうねっている。また、一つの成形スタンド1
0でプロフィールが異なる成形ロール20を組み合わせ
て使用するとき、円周方向に異なった螺旋状態のウネリ
を付けた異形管が製造される。なお、異形管Pの円周方
向に関する凹部d,平坦面f等の個数は、ニーズに応じ
て適宜定められる。When forming rolls 20 having different profiles are used, it is also possible to produce deformed tubes having various helical shapes. For example, in a molding stand incorporating a flat roll as the molding roll 20 (FIG. 8A),
Since a round pipe P 0 is molded by a roll circumferential surface of the flat roll, flat surface f is formed on the resultant deformed pipe P (FIG. 8
b). The flat surface f also undulates spirally in the pipe axis direction, similarly to the deformed pipe P in FIG. Also, one molding stand 1
When a combination of 0 and different forming rolls 20 is used, a profiled tube with undulations of different spiral states in the circumferential direction is produced. The number of concave portions d, flat surfaces f, and the like in the circumferential direction of the deformed pipe P is appropriately determined according to needs.
【0011】[0011]
【実施例】外径54.0mm,肉厚1.6mmの鋼管S
TKM13Bを丸管P0 (素管)として使用し、図6,
7に示すように8個の成形ロール20,20・・を組み
込んだ成形スタンド10で異形管Pを製造した。成形ロ
ール20としては、外径150mm,幅20mm,先端
半径2.5mmのロールを使用し、傾斜角度θ=5度で
ロールチョック21に装着させた。丸管P0 を押込み装
置10で成形スタンド10に押し込み、最大外径48.
5mmの異形管Pに成形した。次いで、異形管Pの形状
精度を向上させるため、矯正スタンド12に送り、異形
管Pの管壁tを押圧加工した。得られた異形管Pには、
成形ロール20のプロフィールに対応した深さ4.0m
mの凹部dが円周方向に8個形成されていた。凹部d
は、異形管Pの管軸方向長さ0.55mで異形管Pを一
周するように、管軸方向に関して螺旋状になっていた。
他方、溶接ビードwは、異形管Pの管軸方向と平行にな
っていた。EXAMPLE A steel pipe S having an outer diameter of 54.0 mm and a wall thickness of 1.6 mm.
Using TKM13B as a round tube P 0 (base tube), FIG.
As shown in FIG. 7, the deformed pipe P was manufactured using the forming stand 10 in which eight forming rolls 20, 20,. As the forming roll 20, a roll having an outer diameter of 150 mm, a width of 20 mm, and a tip radius of 2.5 mm was used, and was attached to the roll chock 21 at an inclination angle θ of 5 degrees. The round tube P 0 is pushed into the molding stand 10 by the pushing device 10 and has a maximum outer diameter of 48.
It was formed into a 5 mm shaped pipe P. Next, in order to improve the shape accuracy of the deformed pipe P, it was sent to the correction stand 12 and the pipe wall t of the deformed pipe P was pressed. In the obtained deformed pipe P,
4.0 m depth corresponding to the profile of the forming roll 20
Eight concave portions d were formed in the circumferential direction. Recess d
Had a spiral shape with respect to the tube axis direction so as to make a round around the deformed tube P with a length of 0.55 m in the tube axis direction of the deformed tube P.
On the other hand, the weld bead w was parallel to the pipe axis direction of the deformed pipe P.
【0012】[0012]
【発明の効果】以上に説明したように、本発明において
は、管軸方向に対して回転軸を傾斜させた成形ロールで
素管を成形することにより、管壁に螺旋状のウネリを付
けた異形管を製造している。この異形管は、素管をネジ
リながら成形したものと異なり、表面状態及び形状安定
性に優れている。しかも、溶接ビードが管軸方向と平行
になっているので、装飾用建材等として使用する場合に
溶接ビードを裏側に配置した見映えのよい施工が可能に
なる。As described above, according to the present invention, a spiral pipe is formed on a pipe wall by forming a raw pipe with a forming roll whose rotation axis is inclined with respect to the pipe axis direction. Manufactures deformed tubes. This deformed tube is excellent in surface condition and shape stability, unlike a tube formed by twisting a raw tube. In addition, since the weld bead is parallel to the pipe axis direction, when used as a decorative building material or the like, a good-looking construction in which the weld bead is disposed on the back side can be performed.
【図1】 従来の異形管Fig. 1 Conventional deformed pipe
【図2】 従来使用されている異形管製造用ロール配置
の模式図FIG. 2 is a schematic view of a conventional roll arrangement for manufacturing a deformed pipe.
【図3】 造管ラインから独立して設けられた異形管成
形装置FIG. 3 A deformed pipe forming device provided independently of a pipe forming line
【図4】 造管ラインに組み込まれた異形管成形装置Fig. 4 Deformed pipe forming device incorporated in pipe making line
【図5】 成形ロールを組み込んだ成形スタンドを管軸
方向(a)及び側面から見た図(b)FIG. 5 is a view (b) of a forming stand incorporating a forming roll as viewed from the tube axis direction (a) and from the side.
【図6】 成形ロールが装着されるロールチョックの断
面図(a)及び側面図(b)FIG. 6 is a cross-sectional view (a) and a side view (b) of a roll chock to which a forming roll is mounted.
【図7】 螺旋状の凹部を付ける成形ロールと丸管又は
異形管との関係を示した模式図(a)及び得られた異形
管(b)FIGS. 7A and 7B are schematic diagrams showing the relationship between a forming roll for forming a spiral recess and a round tube or a deformed tube, and the obtained deformed tube (b).
【図8】 螺旋状にうねった平坦面を付ける成形ロール
と丸管又は異形管との関係を示した模式図(a)及び得
られた異形管(b)FIG. 8 is a schematic view showing the relationship between a forming roll for forming a spirally undulating flat surface and a round pipe or a deformed pipe (a), and the obtained deformed pipe (b).
10:成形スタンド 11:押込み装置 12:矯
正スタンド 13:油圧シリンダ 14:ベアリン
グ 15:造管機 16:ペイオフリール 20:成形ロール 21:ロールチョック 22:
スタンドフレーム 23:圧下スクリュー 24:ロール収容空間 2
5:ロールシャフト 26:カラー P:異形管 P0 :丸管(素管) S:素板
t:管壁 d:凹部 f:平坦面 w:溶接ビード θ:成形ロールの傾
斜角度10: Forming stand 11: Push-in device 12: Straightening stand 13: Hydraulic cylinder 14: Bearing 15: Tube forming machine 16: Payoff reel 20: Forming roll 21: Roll chock 22:
Stand frame 23: Screw down 24: Roll storage space 2
5: Roll shaft 26: Color P: Deformed tube P 0 : Round tube (base tube) S: Base plate
t: pipe wall d: concave portion f: flat surface w: weld bead θ: inclination angle of forming roll
Claims (3)
られた管壁をもち、管軸と平行な方向に溶接ビードが延
びている螺旋状異形管。1. A spiral shaped pipe having a pipe wall provided with a spiral undulation centered on the pipe axis and having a weld bead extending in a direction parallel to the pipe axis.
トを傾斜させた成形ロールで素管を成形し、管軸を中心
とする螺旋状のウネリを管壁に付けることを特徴とする
螺旋状異形管の成形方法。2. A spiral characterized in that a base tube is formed by a forming roll in which a roll shaft is inclined with respect to a plane perpendicular to the tube axis, and a spiral undulation centered on the tube axis is attached to the tube wall. Method for forming irregular shaped pipes.
ルと、個々の成形ロールを回転可能に支持するロールチ
ョックとを備え、管軸に直交する面に対して傾斜させて
ロールシャフトを支持するカラーがロールチョックに設
けられている螺旋状異形管の成形装置。3. A roll shaft, comprising a plurality of forming rolls arranged around a raw pipe and a roll chock rotatably supporting each forming roll, and supporting the roll shaft by inclining with respect to a plane perpendicular to the pipe axis. A device for forming a spiral shaped pipe in which a collar is provided on a roll chock.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5690298A JPH10314837A (en) | 1997-03-12 | 1998-03-09 | Helical deformed tube, method for forming and device therefor |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9-74654 | 1997-03-12 | ||
JP7465497 | 1997-03-12 | ||
JP5690298A JPH10314837A (en) | 1997-03-12 | 1998-03-09 | Helical deformed tube, method for forming and device therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10314837A true JPH10314837A (en) | 1998-12-02 |
Family
ID=26397901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5690298A Withdrawn JPH10314837A (en) | 1997-03-12 | 1998-03-09 | Helical deformed tube, method for forming and device therefor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10314837A (en) |
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A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050510 |