JPH07164067A - Manufacture of pipe with uneven thickness - Google Patents
Manufacture of pipe with uneven thicknessInfo
- Publication number
- JPH07164067A JPH07164067A JP5311613A JP31161393A JPH07164067A JP H07164067 A JPH07164067 A JP H07164067A JP 5311613 A JP5311613 A JP 5311613A JP 31161393 A JP31161393 A JP 31161393A JP H07164067 A JPH07164067 A JP H07164067A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- uneven
- wall thickness
- forming
- roll
- 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- Withdrawn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
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は偏肉厚パイプの製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an uneven wall thickness pipe.
【０００２】[0002]
【従来の技術】偏肉厚パイプの製造方法としては、いわ
ゆるスピニング加工が用いられていた。2. Description of the Related Art A so-called spinning process has been used as a method for manufacturing an uneven wall thickness pipe.
【０００３】図６に示すように、マンドレル１にパイプ
（素管）２を嵌合し、パイプ２をマンドレル１とともに
矢印Ａのように回転させながら、ロール３、３を図示左
方に移動させることによって薄くしごいて長くする減肉
加工方法で製造していた。As shown in FIG. 6, a pipe (element pipe) 2 is fitted to a mandrel 1, and the rolls 3 are moved to the left in the drawing while rotating the pipe 2 together with the mandrel 1 as shown by an arrow A. It was manufactured by a thinning method that thins and squeezes it to lengthen it.
【０００４】２ａはパイプの肉厚が素管の肉厚のまゝの
厚肉部、２ｂは素管の肉厚よりも薄肉にスピニング加工
された薄肉部である。Reference numeral 2a denotes a thick wall portion where the wall thickness of the pipe is the same as the wall thickness of the raw pipe, and 2b denotes a thin wall portion formed by a spinning process to be thinner than the wall thickness of the raw pipe.
【０００５】[0005]
【発明が解決しようとする課題】前記従来技術では、薄
肉部２ｂがスピニング加工によって加工硬化するため、
この薄肉部２ｂをその後の後工程で曲げ加工するには偏
肉厚パイプを焼鈍してから曲げ加工しないと、曲げ加工
できないという問題点があった。In the above prior art, since the thin portion 2b is work-hardened by spinning,
In order to bend the thin portion 2b in a subsequent step, the uneven thickness pipe must be annealed and then bent to be bent.
【０００６】また、薄肉部２ｂが長い場合、つまりパイ
プ素管の全長が長くて必要とする厚肉部２ａが短い場合
には、ロール３、３の移動量が大きくなって、製造装置
が大形になるばかりでなく、加工時間やコストが嵩むと
いう問題点があった。Further, when the thin portion 2b is long, that is, when the total length of the pipe tube is long and the required thick portion 2a is short, the movement amount of the rolls 3 is large, and the manufacturing apparatus is large. There is a problem that not only the shape but the processing time and cost increase.
【０００７】そこで、本発明はこれらの問題点を解消で
きる偏肉厚パイプの製造方法を提供することを目的とす
る。Therefore, an object of the present invention is to provide a method for manufacturing an uneven wall thickness pipe which can solve these problems.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
に、本発明の偏肉厚パイプの製造方法では、必要とする
厚肉部をバルジ成形等とスピニング加工の組合わせで形
成するとともに、薄肉部を素管の肉厚のままとして加工
しないようにした。In order to achieve the above object, in the method for manufacturing an eccentric wall thickness pipe of the present invention, a necessary thick wall portion is formed by a combination of bulge molding and spinning. The thin-walled part was not processed with the wall thickness of the raw pipe being left unchanged.
【０００９】すなわち、請求項１の発明は、端部の肉厚
が一般部よりも大きい偏肉厚パイプを製造する方法にお
いて、パイプ端部（２）に内外へ突出する凹凸部（２
Ａ）を形成する第１の工程と、該凹凸部の内面をロール
（５）で平滑面に成形する第２の工程と、パイプ（２）
内にマンドレル（６）を挿入して前記平滑面と嵌合させ
るとともに、パイプ（２）外側の凹凸部（２ｃ）をロー
ル（７）にて平滑に成形して端部の厚肉部（２Ａ′）を
形成する第３の工程とからなることを特徴とする。That is, the invention of claim 1 is a method for manufacturing an eccentric wall thickness pipe in which the wall thickness of the end portion is larger than that of the general portion, and the concavo-convex portion (2) protruding inward and outward is provided at the pipe end portion (2).
A step of forming A), a second step of forming the inner surface of the uneven portion into a smooth surface by a roll (5), and a pipe (2)
The mandrel (6) is inserted into the inside to fit the smooth surface, and the uneven portion (2c) on the outside of the pipe (2) is smoothly formed by the roll (7) to form a thick portion (2A) at the end. ′) Is formed in the third step.
【００１０】そして、請求項２の発明は、更に内側に凹
凸形状を有する外型でパイプ外周を拘束してパイプ端部
の凹凸部（２Ａ）を形成する第１の行程を行ない、パイ
プ端部を外型（４）凹凸部になつかせてパイプ内側から
ローラ（５）でしごき加工して第２の工程を行なうこと
を特徴とする。The invention according to claim 2 further comprises a first step of forming an uneven portion (2A) at the end of the pipe by restraining the outer circumference of the pipe with an outer die having an uneven shape on the inner side. The second step is carried out by squeezing the outer mold (4) with the concave-convex part and ironing it from the inside of the pipe with the roller (5).
【００１１】また、請求項３の発明は、端部の肉厚が一
般部よりも大きい偏肉厚パイプを製造する方法におい
て、パイプ端部に内外へ突出する凹凸部を形成する第１
の工程と、該凹凸部の外面をロールで平滑面に形成する
第２の工程と、パイプの外側の前記平滑面に外型を嵌合
させるともに、パイプ内側の凹凸部をロールにて平滑に
成形して端部の厚肉部を形成する第３の工程とからなる
ことを特徴とする。Further, the invention of claim 3 is a method for manufacturing an uneven wall thickness pipe having a wall thickness of the end portion larger than that of the general portion, in which an uneven portion protruding inward and outward is formed at the pipe end portion.
And the second step of forming the outer surface of the uneven portion into a smooth surface with a roll, and fitting the outer mold to the smooth surface outside the pipe, and smoothing the uneven portion inside the pipe with a roll. And a third step of forming a thick portion at the end by molding.
【００１２】[0012]
【作用】第１工程で形成した凹凸部の内側と外側を、第
２工程又は第３工程でスピニング加工して厚肉部を形成
する。The inner and outer sides of the uneven portion formed in the first step are subjected to the spinning process in the second step or the third step to form the thick portion.
【００１３】他の部分は素管の肉厚のままの薄肉部とな
る。The other portions are thin-walled portions having the same thickness as the raw pipe.
【００１４】[0014]
【実施例】図１〜図４は本発明の第１実施例で、請求項
１と２に対応する。図１（ａ）のように長さＬ1 の円筒
形の金属素管からなるパイプ２を用意し、第１の工程
で、このパイプ２の右端部に周知のバルジ成形等で内外
へ突出する凹凸部２Ａを形成する。凹凸部２Ａは、図２
（ｂ）に示すように、内側の凹凸部２Ｂと外側の凹凸部
２ｃとからなり、凹凸部２Ａを形成した右端部の肉厚
は、素管の肉厚よりも厚くなっている。従って、その分
だけ、パイプの長さＬ2 がＬ1 より短かくなっている。1 to 4 show a first embodiment of the present invention, which corresponds to claims 1 and 2. As shown in FIG. 1 (a), a pipe 2 made of a cylindrical metal tube having a length L 1 is prepared, and in the first step, the right end of the pipe 2 is protruded inward and outward by well-known bulge molding or the like. The uneven portion 2A is formed. The uneven portion 2A is shown in FIG.
As shown in (b), the wall thickness of the right end portion, which is composed of the inner concave and convex portion 2B and the outer concave and convex portion 2c and in which the concave and convex portion 2A is formed, is larger than the wall thickness of the raw pipe. Therefore, the length L 2 of the pipe is shorter than L 1 by that amount.
【００１５】バルジ成形で凹凸部２Ａを形成するには、
パイプ２を外型（メス型）の中でゴム又は液圧によって
ふくらませて変形させる周知の加工方法を使うことがで
きる。To form the uneven portion 2A by bulge molding,
It is possible to use a known processing method in which the pipe 2 is inflated and deformed by rubber or liquid pressure in an outer die (female die).
【００１６】このようにして、凹凸部２Ａを形成したパ
イプ２を図１（ｃ）のように第２工程にかける。この第
２工程では、パイプ２を回転治具３に嵌合し、外側の凹
凸部２Ｃの波形状に合わせた内面形状をもっている外型
４ａ，４ｂを凹凸部２Ａを覆うように被せる。両外型４
Ａ，４Ｂは両者で一組の外型４を構成する。In this way, the pipe 2 having the uneven portion 2A is subjected to the second step as shown in FIG. 1 (c). In the second step, the pipe 2 is fitted to the rotating jig 3, and the outer molds 4a and 4b having an inner surface shape matching the wave shape of the outer uneven portion 2C are covered so as to cover the uneven portion 2A. Both outer type 4
A and 4B together form a pair of outer molds 4.
【００１７】外型４Ａ，４Ｂは、パイプ２の右端面に当
接する段差部（突き当て部）４ａ，４ｂを有し、波形の
内面形状とこの段差部とにより、加工時におけるパイプ
２の長さ方向への伸びを押さえて板厚方向へ増肉させ
る。The outer dies 4A and 4B have step portions (butting portions) 4a and 4b which come into contact with the right end surface of the pipe 2, and the length of the pipe 2 at the time of working is changed by the corrugated inner surface shape and the step portion. The expansion in the thickness direction is suppressed and the thickness is increased in the plate thickness direction.
【００１８】そして、内側の凹凸部２Ｂにロール５を当
て、回転治具３をその軸線の周りに矢印Ａのように回転
させながら、ロール５を軸線の方向に移動させて、パイ
プ２の凹凸部２ｂをスピニング加工する。こうしてスピ
ニング加工した形状を図１（ｃ）の軸線から下半分に示
す。Then, the roll 5 is applied to the uneven portion 2B on the inner side, and the roll 5 is moved in the direction of the axis while rotating the rotating jig 3 around the axis as indicated by the arrow A, so that the unevenness of the pipe 2 is obtained. The part 2b is processed by spinning. The shape thus spun is shown in the lower half from the axis of FIG.
【００１９】図１（ｄ）は、第２工程で加工したパイプ
２の形状で、その右端部内側を符号２Ｄで示す。図１
（ｅ）は第３工程で、回転治具３に嵌合した図１（ｄ）
のパイプ２の右端部にマンドレル６を嵌入し、パイプ２
の外側の凹凸部２Ｃにロール７を当て、回転治具３をそ
の軸線の周りに矢印Ａのように回転させながら、ロール
７を軸線の方向に移動させて、パイプ２の凹凸部２ｃを
スピニング加工する。マンドレル６には、段差部６ａが
形成され、この段差部６ａがパイプ２の右端に当接する
ことで、第３工程におけるパイプ２の長さ方向（図示右
方向）への伸びを押さえ、板厚方向へ増肉させる。又、
マンドレル６は、ワーク（パイプ）２を脱着できるよう
に、図示左右に移動可能である。FIG. 1 (d) shows the shape of the pipe 2 processed in the second step, and the inside of the right end portion thereof is indicated by reference numeral 2D. Figure 1
(E) is a third step, and is shown in FIG.
Insert the mandrel 6 into the right end of the pipe 2
The roll 7 is applied to the uneven portion 2C on the outer side of the, and the rolling jig 3 is moved in the direction of the axis while rotating the rotating jig 3 around the axis line thereof as indicated by the arrow A to spin the uneven portion 2c of the pipe 2. To process. A step portion 6a is formed on the mandrel 6, and the step portion 6a abuts on the right end of the pipe 2 to suppress the extension of the pipe 2 in the length direction (right direction in the drawing) in the third step, thereby reducing the plate thickness. Increase the thickness in the direction. or,
The mandrel 6 is movable left and right in the drawing so that the work (pipe) 2 can be attached and detached.
【００２０】このようにして右端部を増肉加工したパイ
プ２を図１（ｆ）に示す。凹凸部２Ｂと２Ｃが、それぞ
れ符号２Ｄ，２Ｅのように平滑面にスピニング加工され
た厚肉部２Ａ′に形成されている。FIG. 1 (f) shows a pipe 2 whose right end portion is thickened in this way. Concavo-convex portions 2B and 2C are formed in a thick portion 2A 'that is formed by a smooth surface by spinning as indicated by reference numerals 2D and 2E, respectively.
【００２１】図２は、図１（ｃ）の第２工程を説明する
別の図で、図２（ａ）は、パイプの右側からみた図、図
２（ｂ）は要部拡大縦断面図、図２（ｃ）は外型４Ａの
斜視図で、パイプ２の外側凹凸部２ｃの波形状に合わせ
た外型４Ａの内面形状と段差部４ａが明瞭に示されてい
る。FIG. 2 is another view for explaining the second step of FIG. 1C, FIG. 2A is a view seen from the right side of the pipe, and FIG. 2 (c) is a perspective view of the outer die 4A, in which the inner surface shape of the outer die 4A and the step portion 4a which are matched with the corrugated shape of the outer uneven portion 2c of the pipe 2 are clearly shown.
【００２２】図３は、図１（ｅ）の第３工程を説明する
別の図で、（ａ）は要部拡大縦断面図、（ｂ）はマンド
レル６の斜視図である。図４はパイプの外側の凹凸部２
Ｃが図１（ｅ）の第３工程によってスピニング加工され
るときの肉の移動を説明する図で、ハッチングした山部
の肉がハッチングした谷部へ移動し、外周面が平滑化さ
れる。FIG. 3 is another view for explaining the third step of FIG. 1E, in which FIG. 3A is an enlarged vertical sectional view of a main part, and FIG. 3B is a perspective view of the mandrel 6. FIG. 4 shows the uneven portion 2 on the outside of the pipe.
It is a figure explaining movement of meat when C is spinning-processed by the 3rd process of Drawing 1 (e), and meat of a hatched mountain part moves to a valley part which hatched, and an outer peripheral surface is smoothed.
【００２３】パイプ２の全長は素管のときの長さＬ1 か
らＬ2 まで短かくなり、短かくなった分、板厚方向に増
肉されることになる。上述の第１実施例では、パイプ端
部に形成した凹凸部２Ａが、環状であるため、マンドレ
ル６がパイプ２に抜き差し可能とするために、その前の
第２工程で内側の凹凸部２Ｂをスピニング加工するよう
にしたが、図５の第２実施例ではパイプ２の右端部に形
成した内外の凹凸部２Ａをねじ山のような螺線形状にし
ている。The total length of the pipe 2 is shortened from the length L 1 to L 2 in the case of the raw pipe, and the shortened length increases the thickness in the plate thickness direction. In the above-described first embodiment, since the uneven portion 2A formed at the end of the pipe is annular, the mandrel 6 can be inserted into and removed from the pipe 2, so that the uneven portion 2B on the inner side is formed in the second step before that. Although the spinning process is performed, in the second embodiment shown in FIG. 5, the inner and outer uneven portions 2A formed on the right end portion of the pipe 2 have a spiral shape like a screw thread.
【００２４】こうすることで、凹凸部２Ａの外側に当て
る外型（メス型）をナットのような形状とし、凹凸部２
Ａの内側に当てる内外（オス型）をボルトのような形状
とすることが可能となる。こうすると上記第１実施例の
第２工程と第３工程の順序を逆にすることも可能とな
り、請求項３の発明となる。なお、図５の第２実施例で
は、図１の実施例の（ａ）（ｂ）に対応する図面だけを
示し、第２〜第３工程を省略しているが、第２又は第３
工程の型形状が変ることと、第２と第３の工程の順序が
変更可能となることは、これらの説明で明らかである。By doing so, the outer die (female type) to be applied to the outside of the uneven portion 2A is shaped like a nut, and the uneven portion 2 is formed.
The inside and outside (male type) applied to the inside of A can be shaped like a bolt. This makes it possible to reverse the order of the second step and the third step of the first embodiment, which is the invention of claim 3. In the second embodiment of FIG. 5, only the drawings corresponding to (a) and (b) of the embodiment of FIG. 1 are shown, and the second to third steps are omitted, but the second or third embodiment is omitted.
It is clear from these explanations that the mold shape of the process is changed and the order of the second and third processes can be changed.
【００２５】[0025]
【発明の効果】本発明による偏肉厚パイプの製造方法は
上述のように構成されているので、薄肉部が素材の肉厚
のまゝでありかつ端部が増肉法で厚肉部に加工される。
そのため、薄肉部が従来のように加工硬化しないため、
焼鈍させなくても、後加工で曲げ加工ができ、加工性が
よくなる。EFFECT OF THE INVENTION Since the method for manufacturing an eccentric wall thickness pipe according to the present invention is configured as described above, the thin wall portion is equal to the wall thickness of the raw material and the end portion is thickened by the thickening method. Is processed.
Therefore, since the thin part does not work harden as in the past,
Even if it is not annealed, it can be bent as a post process, improving workability.
【００２６】また、素材の全長が長く、必要とする厚肉
部が短い場合、従来の減肉法に比べてロールの移動量が
小さいため、装置が小形化できる利点がある。Further, when the total length of the material is long and the required thick portion is short, the movement amount of the roll is small as compared with the conventional thinning method, so that there is an advantage that the apparatus can be downsized.
【図１】本発明による偏肉厚パイプの製造方法の第１実
施例を段階的に示した図で、（ａ）は素管（パイプ）の
斜視図、（ｂ）は第１工程後のパイプの斜視図、（ｃ）
は第１工程を説明する縦断面図で上半分は加工前の形状
を下半分は加工後の形状を示す。（ｄ）は第２工程後の
パイプの縦断面図、（ｅ）は第３工程を説明する縦断面
図で上半分は加工前の形状を下半分は加工後の形状を示
す。（ｆ）は第３工程後のパイプの縦断面図である。FIG. 1 is a diagram showing stepwisely a first embodiment of a method for manufacturing an uneven thickness pipe according to the present invention, in which (a) is a perspective view of a raw pipe (pipe) and (b) is a diagram after a first step. Perspective view of the pipe, (c)
Is a vertical cross-sectional view for explaining the first step, the upper half shows the shape before processing and the lower half shows the shape after processing. (D) is a vertical cross-sectional view of the pipe after the second step, and (e) is a vertical cross-sectional view illustrating the third step. The upper half shows the shape before processing and the lower half shows the shape after processing. (F) is a longitudinal sectional view of the pipe after the third step.
【図２】本発明の第１実施例で、（ａ）は第２工程の右
側面図、（ｂ）は第２工程の一部を拡大した縦断面図、
（ｃ）は第２工程に使う外型の斜視図である。FIG. 2A is a right side view of the second step in the first embodiment of the present invention, and FIG. 2B is an enlarged vertical sectional view of a part of the second step;
FIG. 7C is a perspective view of an outer die used in the second step.
【図３】本発明の第１実施例で、（ａ）は第３工程の一
部を拡大した縦断面図、（ｂ）は第３工程に使うマイド
レルの斜視図である。FIG. 3A is a longitudinal sectional view in which a part of the third step is enlarged in the first embodiment of the present invention, and FIG. 3B is a perspective view of a middrel used in the third step.
【図４】本発明による偏肉厚パイプの製造方法による肉
流れを説明する図である。FIG. 4 is a diagram illustrating a meat flow by the method for manufacturing an uneven thickness pipe according to the present invention.
【図５】本発明の第２実施例の各段階の一部を示す図
で、（ａ）は素管（パイプ）の正面図、（ｂ）は第１工
程後のパイプの正面図である。FIG. 5 is a diagram showing a part of each stage of the second embodiment of the present invention, (a) is a front view of a raw pipe (pipe), and (b) is a front view of the pipe after the first step. .
【図６】従来技術の製造方法を説明する縦断面図であ
る。FIG. 6 is a vertical cross-sectional view illustrating a conventional manufacturing method.
２ パイプ ２Ａ，２Ａ′ 凹凸部 ２Ｂ 内側の凹凸部 ２Ｃ 外側の凹凸部 ４ 外型 ５，７ ローラ ６ マンドレル 2 Pipes 2A, 2A 'Concavo-convex section 2B Inner concavo-convex section 2C Outer concavo-convex section 4 Outer mold 5,7 Roller 6 Mandrel
Claims (3)
パイプを製造する方法において、 パイプ端部に内外へ突出する凹凸部を形成する第１の工
程と、 該凹凸部の内面をロールで平滑面に成形する第２の工程
と、 パイプ内にマンドレルを挿入して前記平滑面と嵌合させ
るとともに、パイプ外側の凹凸部をロールにて平滑に成
形して端部の厚肉部を形成する第３の工程とからなるこ
とを特徴とする偏肉厚パイプの製造方法。1. A method of manufacturing an uneven wall thickness pipe having a wall thickness of an end portion larger than that of a general portion, the first step of forming an uneven portion protruding inward and outward at an end portion of the pipe, and an inner surface of the uneven portion. The second step of forming a smooth surface with a roll, and inserting the mandrel into the pipe to fit the smooth surface, and the uneven portion on the outside of the pipe is smoothly formed with a roll to increase the thickness of the end portion. And a third step of forming a portion.
周を拘束してパイプ端部の凹凸部を形成する第１の行程
を行ない、パイプ端部を外型凹凸部になつかせてパイプ
内側からローラでしごき加工して第２の工程を行なうこ
とを特徴とする請求項１記載の偏肉厚パイプの製造方
法。2. A first step of forming a concavo-convex portion of a pipe end by constraining the outer periphery of the pipe with an outer die having a concavo-convex shape on the inner side, and letting the pipe end be connected to the outer concavo-convex portion, the pipe inner side 2. The method for manufacturing an eccentric wall thickness pipe according to claim 1, wherein the second step is performed by ironing with a roller.
パイプを製造する方法において、 パイプ端部に内外へ突出する凹凸部を形成する第１の工
程と、 該凹凸部の外面をロールで平滑面に形成する第２の工程
と、 パイプの外側の前記平滑面に外型を嵌合させるともに、
パイプ内側の凹凸部をロールにて平滑に成形して端部の
厚肉部を形成する第３の工程とからなることを特徴とす
る偏肉厚パイプの製造方法。3. A method of manufacturing an uneven wall thickness pipe having an end wall thickness larger than that of a general part, the first step of forming an uneven portion protruding inward and outward at an end portion of the pipe, and an outer surface of the uneven portion. The second step of forming a smooth surface with a roll, and fitting the outer mold to the smooth surface outside the pipe,
A third step of forming an uneven portion on the inside of the pipe with a roll to form a thick portion at an end, and a third step of producing an uneven thickness pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5311613A JPH07164067A (en) | 1993-12-13 | 1993-12-13 | Manufacture of pipe with uneven thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5311613A JPH07164067A (en) | 1993-12-13 | 1993-12-13 | Manufacture of pipe with uneven thickness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07164067A true JPH07164067A (en) | 1995-06-27 |
Family
ID=18019364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5311613A Withdrawn JPH07164067A (en) | 1993-12-13 | 1993-12-13 | Manufacture of pipe with uneven thickness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07164067A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997009135A1 (en) * | 1995-09-07 | 1997-03-13 | Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik | Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends |
| KR100859163B1 (en) * | 2007-03-08 | 2008-09-19 | 이운령 | Screw thread forming apparatus of filler tube for vehichle |
| JP2010534136A (en) * | 2007-07-24 | 2010-11-04 | ファウ・ウント・エム・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Method for manufacturing a hot-finished seamless tube constructed to provide optimum fatigue properties in the welded state |
| CN104874638A (en) * | 2015-06-19 | 2015-09-02 | 左铁军 | Manufacturing process for equal wall thickness variable-diameter copper pipe |
| CN108435870A (en) * | 2018-04-18 | 2018-08-24 | 华中科技大学 | A kind of accumulation of multi-pass spinning thickens manufacturing process |
| CN111389951A (en) * | 2020-03-26 | 2020-07-10 | 燕山大学 | Tubular product rolls bloated forming hydraulic press |
| CN112058937A (en) * | 2020-07-29 | 2020-12-11 | 宁波大学 | Long hollow tube inner wall thinning forming method |
| WO2021152896A1 (en) * | 2020-01-31 | 2021-08-05 | 株式会社キーレックス | Method for molding screw thread of metal pipe |
-
1993
- 1993-12-13 JP JP5311613A patent/JPH07164067A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997009135A1 (en) * | 1995-09-07 | 1997-03-13 | Dynamit Nobel Gmbh Explosivstoff- Und Systemtechnik | Method and device for producing pressure-rolled pipes with thickened inner wall sections at the ends |
| KR100859163B1 (en) * | 2007-03-08 | 2008-09-19 | 이운령 | Screw thread forming apparatus of filler tube for vehichle |
| JP2010534136A (en) * | 2007-07-24 | 2010-11-04 | ファウ・ウント・エム・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Method for manufacturing a hot-finished seamless tube constructed to provide optimum fatigue properties in the welded state |
| CN104874638A (en) * | 2015-06-19 | 2015-09-02 | 左铁军 | Manufacturing process for equal wall thickness variable-diameter copper pipe |
| CN108435870A (en) * | 2018-04-18 | 2018-08-24 | 华中科技大学 | A kind of accumulation of multi-pass spinning thickens manufacturing process |
| WO2021152896A1 (en) * | 2020-01-31 | 2021-08-05 | 株式会社キーレックス | Method for molding screw thread of metal pipe |
| JP2021121446A (en) * | 2020-01-31 | 2021-08-26 | 株式会社キーレックス | Spiral thread molding method of metal pipe |
| CN111389951A (en) * | 2020-03-26 | 2020-07-10 | 燕山大学 | Tubular product rolls bloated forming hydraulic press |
| CN111389951B (en) * | 2020-03-26 | 2020-12-25 | 燕山大学 | Tubular product rolls bloated forming hydraulic press |
| US11679426B2 (en) | 2020-03-26 | 2023-06-20 | Yanshan University | Rolling-bulging forming hydraulic machine for tubular products |
| CN112058937A (en) * | 2020-07-29 | 2020-12-11 | 宁波大学 | Long hollow tube inner wall thinning forming method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010306 |