JPH04262819A - Method for bulging metallic extruded tube - Google Patents
Method for bulging metallic extruded tubeInfo
- Publication number
- JPH04262819A JPH04262819A JP3022122A JP2212291A JPH04262819A JP H04262819 A JPH04262819 A JP H04262819A JP 3022122 A JP3022122 A JP 3022122A JP 2212291 A JP2212291 A JP 2212291A JP H04262819 A JPH04262819 A JP H04262819A
- Authority
- JP
- Japan
- Prior art keywords
- extruded
- tube
- extrusion
- extruded tube
- platen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 20
- 238000001125 extrusion Methods 0.000 claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000000071 blow moulding Methods 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 238000000137 annealing Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Landscapes
- Extrusion Of Metal (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、自動車部品、機械、
建築部品等の用途に用いられるアルミニウム（その合金
を含む、以下同じ）その他の金属押出管の成形加工方法
に関する。[Industrial Application Field] This invention is applicable to automobile parts, machinery,
This invention relates to a method for forming extruded pipes of aluminum (including its alloys, the same shall apply hereinafter) and other metals used for applications such as building parts.
【０００２】0002
【従来の技術】自動車、機械、建築等の技術発展に伴い
、部品等として用いられる金属押出管に対してもニーズ
の多様化に応じて種々の形状にこれらを成形加工するこ
とが求められている。例えばアルミニウム中空押出管で
は、その長さ方向の中間部に膨出部を有する形状のもの
に塑性変形することが求められる場合がある。[Prior Art] With the technological development of automobiles, machinery, architecture, etc., there is a demand for extruded metal tubes used as parts etc. to be molded into various shapes to meet diversifying needs. There is. For example, an aluminum hollow extruded tube may be required to be plastically deformed into a shape that has a bulge in the middle of its length.
【０００３】従来、上記のような金属押出管の塑性変形
を伴う成形加工は、押出工程終了後に別工程として行わ
れるものであった。例えばアルミニウム中空押出材を、
長さ方向の中間部において膨出部を有する形状に成形す
る場合は、押出工程終了後に押出管をＴ１ 処理したの
ち焼鈍し、次いでブロー成形またはバルジ成形により外
力を付与して所期する部位を膨出状に塑性変形せしめる
。
そして、その後溶体化処理と時効処理とを順次的に実施
することにより行っていた。[0003] Conventionally, the above-described forming process involving plastic deformation of an extruded metal tube was performed as a separate process after the extrusion process was completed. For example, aluminum hollow extrusion material,
When molding into a shape with a bulge in the middle part in the length direction, after the extrusion process is finished, the extruded tube is subjected to T1 treatment and then annealed, and then an external force is applied by blow molding or bulge molding to form the desired part. It is plastically deformed into a bulging shape. Thereafter, solution treatment and aging treatment were sequentially performed.
【０００４】0004
【発明が解決しようとする課題】ところが、このような
方法では、押出工程終了後に成形加工を行うため、押出
から成形加工終了に至るまで長時間を要し、生産性が悪
くひいてはコストアップにつながるという欠点があった
。しかも、変形を容易にするための焼鈍、溶体化等の熱
処理工程が多くならざるを得ず、生産性の悪化、コスト
増に益々拍車をかけていた。しかもまた、塑性変形のた
めのブローまたはバルジ成形に際して、押出管の変形抵
抗が大きく、このため設備が大型化せざるを得ないとい
うような問題もあった。[Problems to be Solved by the Invention] However, in this method, since the molding process is performed after the extrusion process is completed, it takes a long time from extrusion to the end of the molding process, resulting in poor productivity and increased costs. There was a drawback. In addition, heat treatment steps such as annealing and solution treatment to facilitate deformation have to be required, further accelerating deterioration of productivity and increase in costs. Moreover, during blowing or bulge forming for plastic deformation, the deformation resistance of the extruded tube is large, and as a result, there is a problem in that the equipment has to be enlarged.
【０００５】この発明は、かかる技術的背景に鑑みてな
されたものであって、膨出成形工程を簡略化しうるとと
もに、小さな力で大きな変形を可能にして設備の大型化
を招くことのない金属押出管の膨出成形方法の提供を目
的とする。[0005] The present invention was made in view of the above technical background, and it is possible to simplify the expansion molding process, and to create a metal that can be deformed to a large extent with a small force without causing an increase in the size of the equipment. The purpose of the present invention is to provide a method for blow molding an extruded tube.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、押出の際の熱を利用し、押出直後の塑
性変形容易な高温状態のうちに、管内部に流体圧力を導
入して膨出成形加工を実施しようというものである。[Means for Solving the Problems] In order to achieve the above object, the present invention uses heat during extrusion to introduce fluid pressure into the inside of the tube while it is in a high temperature state where plastic deformation is easy immediately after extrusion. The idea is to carry out the bulge molding process.
【０００７】即ちこの発明は、押出機から押出された金
属押出管を、押出直後の高温状態のうちに、管内部へ導
入した流体圧力によって径大方向へ変形させることを特
徴とする金属押出管の膨出成形方法を要旨とする。That is, the present invention provides an extruded metal tube characterized in that the extruded metal tube extruded from an extruder is deformed in the direction of increasing diameter by fluid pressure introduced into the tube while it is in a high temperature state immediately after extrusion. The gist of this paper is the expansion molding method.
【０００８】[0008]
【作用】押出直後の高温状態においては、押出管はその
熱によりそれ自体変形容易な状態となっている。この状
態を利用して、管内部へ導入した流体圧力によって径大
方向へ膨出変形させるから、押出工程と並行して成形加
工が行われる。また、変形を容易化するための焼鈍処理
も必要ないし、成形後そのまま冷却すれば通常の押出管
と同じ性質のものが得られるから、溶体化処理も省略で
きる。また、高温状態のうちに変形を行うから、小さな
外力で大きな変形を付与することができ、設備も小型の
もので済む。[Operation] In the high temperature state immediately after extrusion, the extruded tube itself is easily deformed due to the heat. Utilizing this state, the fluid pressure introduced into the tube causes it to expand and deform in the radial direction, so that the molding process is performed in parallel with the extrusion process. Furthermore, annealing treatment to facilitate deformation is not required, and a product with the same properties as a normal extruded tube can be obtained by cooling as is after molding, so solution treatment can also be omitted. Furthermore, since the deformation is performed while the material is at high temperature, a large deformation can be applied with a small external force, and the equipment can be small.
【０００９】[0009]
【実施例】次に、この発明をアルミニウム押出管の成形
に適用した実施例に基いて説明する。EXAMPLE Next, the present invention will be explained based on an example in which the present invention is applied to the molding of an extruded aluminum tube.
【００１０】図１は、この発明を実施する第１の装置を
示すものである。これらの図において（１）はコンテナ
、（２）はステム、（３）はアルミニウムビレット（こ
の実施例ではＡ６０６３合金の５００℃、７インチビレ
ットを用いている）であり、該ビレット（３）はコンテ
ナ（１）に装填されるとともにステムの前進によって出
側への加圧力（この実施例では１８００トン）が付与さ
れるものとなされている。（４）はコンテナ（１）の前
端に配置された中空押出ダイスであり、このダイス（４
）はダイス雄型（４１）とダイス雌型（４２）との組合
せからなる。さらにダイス（４）の出側には、ブロー成
形金型（５）が近接配置されており、該金型のさらに出
側にはプラテン（６）が配置されている。従って、コン
テナ（１）のビレットはダイス（４）から押出管（Ａ）
（この実施例では外径５０ｍｍ、肉厚１ｍｍ）に押出さ
れたのち、ブロー成形金型（５）さらにプラテン（６）
を通過して送られるものとなされている。また、プラテ
ン（６）は図示しない加圧装置によってコンテナ（１）
側への加圧力を解除可能に付与されている。FIG. 1 shows a first apparatus for implementing the invention. In these figures, (1) is a container, (2) is a stem, and (3) is an aluminum billet (in this example, a 500°C, 7-inch billet of A6063 alloy is used). As the container (1) is loaded, a pressing force (1800 tons in this example) is applied to the exit side by advancing the stem. (4) is a hollow extrusion die placed at the front end of the container (1);
) consists of a combination of a male die (41) and a female die (42). Further, a blow molding mold (5) is arranged close to the exit side of the die (4), and a platen (6) is arranged further on the exit side of the mold. Therefore, the billet in the container (1) is extruded from the die (4) into the extruded tube (A).
(In this example, the outer diameter is 50 mm and the wall thickness is 1 mm.) After extrusion, the blow molding mold (5) and the platen (6) are
It is assumed that the data will be sent through the . In addition, the platen (6) is pressed against the container (1) by a pressurizing device (not shown).
It is applied so that the pressing force on the side can be released.
【００１１】前記ブロー成形金型（５）は、上下金型単
位（５１）（５１）からなる２分割式のもので、各金型
単位（５１）（５１）はプラテン（６）による加圧力の
解除を条件にそれぞれ上下に進退移動可能となされてい
る。かつ各金型単位（５１）（５１）の内側対向面中央
部には半球状の凹部が設けられており、両金型単位（５
１）（５１）が最接近した状態では図１に示すように、
金型（５）の内部において押出管（Ａ）を取巻く球状の
膨出用空間（７）が形成されたものとなされている。The blow molding mold (5) is a two-piece type consisting of upper and lower mold units (51) (51), and each mold unit (51) (51) receives pressure from the platen (6). It is possible to move forward and backward, respectively, on the condition that the above is released. In addition, a hemispherical recess is provided in the center of the inner facing surface of each mold unit (51) (51), and both mold units (51)
1) When (51) is closest, as shown in Figure 1,
A spherical expansion space (7) surrounding the extruded tube (A) is formed inside the mold (5).
【００１２】また、前記雄型ダイス（４１）及びコンテ
ナ（１）には、該コンテナ（１）を肉厚方向に貫通しか
つ雄型ダイス（４１）を外周面から中心部へと半径方向
に貫通しさらにそこから肉厚方向に貫通して雄型ダイス
（４１）の出側端面に開口するブロー成形用流体の導入
孔（８）が形成されている。かかる構成によりダイス（
４）から押出されるアルミニウム押出管（Ａ）に内部か
ら流体を圧送して押出管の径大方向への膨出成形が可能
となされている。ここに、流体としては気体、液体いず
れでも良いが、取扱いの簡易性の点から気体を用いるの
が良く、この実施例ではエアーを用いている。[0012] The male die (41) and the container (1) also have a shape that penetrates the container (1) in the thickness direction and extends the male die (41) from the outer peripheral surface to the center in the radial direction. A blow molding fluid introduction hole (8) is formed which penetrates through the male die (41) in the thickness direction and opens at the exit end surface of the male die (41). With this configuration, the dice (
4) By pumping fluid from inside to the extruded aluminum tube (A), it is possible to expand the extruded tube in the direction of increasing its diameter. Here, the fluid may be either gas or liquid, but from the viewpoint of ease of handling, it is preferable to use gas, and in this embodiment, air is used.
【００１３】さらに、前記プラテン（６）の内側には、
押出管（Ａ）の該プラテン通過部分を冷却する図示しな
い冷却装置が設けられている。この冷却装置は押出管（
Ａ）のプラテン通過部分を冷却してその降伏応力を大と
しておくことにより、押出管（Ａ）の膨出成形に際して
プラテン通過部分における押出管の変形を防止し、ブロ
ー成形金型（５）においてのみ変形させる役割を果たす
。Furthermore, inside the platen (6),
A cooling device (not shown) is provided to cool the portion of the extrusion tube (A) that passes through the platen. This cooling device is an extruded tube (
By cooling the platen passing portion of A) to increase its yield stress, deformation of the extruded tube at the platen passing portion is prevented during expansion molding of the extruded tube (A), and the blow molding die (5) It only serves to transform the body.
【００１４】次に、図１に示した装置を用いたアルミニ
ウム押出管（Ａ）の膨出成形方法を説明すると、まずス
テムを前進させて押出管（Ａ）を押出したのちその先端
部（Ａ１ ）を密封加工する。なお、押出に先立ってブ
ロー成形金型（５）は金型単位（５１）（５１）相互の
最接近位置まで前進させておく。押出管（Ａ）を所定長
さ押出したのち押出を一旦停止する。次いでプラテン（
６）内の冷却装置を作動させて、押出管（Ａ）のプラテ
ン通過部分を冷却する。この冷却により、押出管（Ａ）
のプラテン通過部分は降伏応力が大となり変形抵抗が増
大して変形しにくくなる。一方、押出管（Ａ）のうちブ
ロー成形金型（５）の通過部分は押出直後でいまだ高温
状態を維持しており、変形容易となっている。そして、
この状態でブロー成形用流体の導入孔（８）の導入口（
８ａ）から押出管（Ａ）へとエアーを圧送する。すると
、図２に示すように変形容易な押出管（Ａ）のブロー成
形金型部分がブロー成形金型（５）の膨出用空間（７）
の内部形状に沿って径大方向に膨出変形する。[0014] Next, a method of extrusion molding an extruded aluminum tube (A) using the apparatus shown in FIG. ) is sealed. Note that, prior to extrusion, the blow molding die (5) is advanced to a position where the die units (51) (51) are closest to each other. After extruding the extrusion tube (A) for a predetermined length, extrusion is temporarily stopped. Next, the platen (
6) Activate the cooling device to cool the portion of the extrusion tube (A) that passes through the platen. By this cooling, the extruded tube (A)
The portion passing through the platen has a large yield stress, increases deformation resistance, and becomes difficult to deform. On the other hand, the portion of the extruded tube (A) that passes through the blow molding die (5) still maintains a high temperature state immediately after extrusion, and is easily deformed. and,
In this state, the inlet of the blow molding fluid inlet (8) (
Air is pumped from 8a) to the extrusion tube (A). Then, as shown in Fig. 2, the blow molding mold part of the extruded tube (A), which is easily deformed, moves into the expansion space (7) of the blow molding mold (5).
It bulges and deforms in the radial direction along the internal shape of.
【００１５】変形後プラテン（６）の加圧力を解除して
、金型単位（５１）（５１）を図３のように後退離間せ
しめたのち、再び押出を遂行する。そして、押出管（Ａ
）の次の膨出予定部位がブロー成形用金型（５）の位置
まで押出された時点で押出を停止し、プラテン（６）の
加圧力解除、金型単位（５１）（５１）の前進、プラテ
ン内の押出管冷却、膨出の各工程を順次的に行い、以後
同様の動作を繰返す。こうして得られた押出管（Ａ）は
、長さ方向に複数の膨出部（Ａ２ ）を間隔的に有する
ものとなるから、押出後における別途の変形工程はもは
や不要となる。After the deformation, the pressing force of the platen (6) is released and the mold units (51) (51) are moved back and away as shown in FIG. 3, and then extrusion is performed again. Then, the extruded tube (A
) extrusion is stopped when the next bulging area is extruded to the position of the blow molding die (5), the pressurizing force of the platen (6) is released, and the die units (51) (51) are moved forward. , cooling of the extrusion tube in the platen, and expansion are performed in sequence, and the same operations are repeated thereafter. Since the extruded tube (A) thus obtained has a plurality of bulges (A2) at intervals in the length direction, a separate deformation step after extrusion is no longer necessary.
【００１６】図４はこの発明を実施する他の装置を示す
ものである。この装置では、ダイス（４）の出側直後に
プラテン（６）が配置され、プラテンの外側にブロー成
形用金型（５）がその金型単位（５１）（５１）をプラ
テンと無関係に接近離間自在に配置されている。また、
ダイス（４）におけるエア導入孔の先端開口部に連通し
てステンレス製のエアー導入管（９）が設けられ、この
導入管（９）の先端はブロー成形金型（５）の膨出用空
間（７）の位置まで延出している。なお、図４において
図１に示した装置と同一構成部分については同一の符号
を付し、その説明を省略する。FIG. 4 shows another apparatus for implementing the invention. In this device, a platen (6) is placed immediately after the exit side of the die (4), and a blow molding mold (5) is placed outside the platen to approach its mold units (51) (51) independently of the platen. They are arranged so that they can be separated freely. Also,
A stainless steel air introduction tube (9) is provided in communication with the tip opening of the air introduction hole in the die (4), and the tip of this introduction tube (9) is connected to the expansion space of the blow molding die (5). It extends to position (7). In FIG. 4, the same components as those in the apparatus shown in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.
【００１７】図４に示した装置では、押出管（Ａ）の先
端を密封したのち、金型単位（５１）（５１）を最接近
位置まで移動させて押出管（Ａ）を図５に示すように金
型単位（５１）（５１）の押出方向端部において縮径状
態に圧潰する。次いで、エアー導入孔（８）の導入口（
８ａ）から導入管（９）を介して押出管（Ａ）のブロー
成形金型部分にエアーを圧送する。押出管（Ａ）は押出
直後の高温状態を維持しているから変形容易であり、従
ってこのエアー圧力により図６に示すようにブロー成形
金型（５）内において押出管（Ａ）がブロー成形金型（
５）の膨出用空間（７）に沿って径大方向に膨出変形す
る。In the apparatus shown in FIG. 4, after the tip of the extruded tube (A) is sealed, the mold units (51) (51) are moved to the closest position to form the extruded tube (A) as shown in FIG. The mold units (51) are crushed into a diameter-reduced state at the ends in the extrusion direction. Next, the inlet of the air inlet (8) (
Air is pumped from 8a) through the introduction pipe (9) to the blow molding mold part of the extrusion pipe (A). Since the extruded tube (A) maintains a high temperature state immediately after extrusion, it is easily deformed. Therefore, the extruded tube (A) is blow molded in the blow molding die (5) by this air pressure as shown in FIG. Mold(
5) is bulged and deformed in the radial direction along the bulging space (7).
【００１８】次いで、図７に示すように金型単位（５１
）（５１）を後退離間せしめたのち、押出管（Ａ）の押
出を再開する。Next, as shown in FIG. 7, the mold unit (51
) (51) is moved back and away, and then extrusion of the extrusion tube (A) is resumed.
【００１９】押出管（Ａ）を次の膨出予定部位まで押出
したところで押出を停止し、金型単位（５１）（５１）
を前進接近させて圧潰し、以後同様の動作を繰返す。When the extruded tube (A) has been extruded to the next planned swelling area, the extrusion is stopped and the mold units (51) (51)
Move forward and crush it, then repeat the same action.
【００２０】こうして得られた押出管（Ａ）は膨出部と
縮径部とが交互に形成されたものとなる。なお、図４に
示す装置では、プラテン（６）と無関係に金型単位（５
１）（５１）を移動させることができる点、プラテン（
６）内の冷却装置を不要となしうる点等で利点がある。The extruded tube (A) thus obtained has bulging portions and reduced diameter portions formed alternately. In addition, in the apparatus shown in FIG. 4, the mold unit (5
1) (51) can be moved, the platen (
6) There are advantages in that the cooling device in item 6) can be made unnecessary.
【００２１】なお、以上の実施例では押出管（Ａ）をそ
の周方向全体に亘って径大方向へ膨出させたが、周方向
の一部のみにおいて膨出させても良いし、また長さ方向
の全長に亘って膨出部を形成しても良い。[0021] In the above embodiment, the extruded tube (A) was bulged in the radial direction over the entire circumferential direction, but it may be bulged only in a part of the circumferential direction, or the extruded tube (A) may be bulged in the direction of increasing the diameter. The bulge may be formed over the entire length in the transverse direction.
【００２２】[0022]
【発明の効果】この発明は上述の次第で、押出直後の高
温状態を利用して押出管が変形容易なうちに、管内部へ
導入した流体圧力によって径大方向へ膨出変形させるか
ら、押出工程と変形工程とを同時的に行うことができ、
従来のような押出後に別途実施していた変形工程を不要
となしうる。このため、成形品の製作時間を短縮するこ
とができ、生産性を向上することができる。また、塑性
変形を容易にするための焼鈍等の熱処理工程をも不要と
なしうるから、益々生産効率の向上を図りうる。さらに
、押出直後の高温で変形抵抗の小さいうちに変形操作を
行うから、小さな加工力で大きな変形量を得ることがで
き、大きな加工力を発生するために設備が大型化する不
都合を解消しうる。Effects of the Invention As described above, the present invention makes use of the high temperature state immediately after extrusion to bulge and deform the extruded tube in the radial direction by the fluid pressure introduced into the tube while it is easily deformed. The process and the deformation process can be performed simultaneously,
The conventional deformation step, which was performed separately after extrusion, can be made unnecessary. Therefore, the manufacturing time of the molded product can be shortened and productivity can be improved. Further, since heat treatment steps such as annealing for facilitating plastic deformation can be made unnecessary, production efficiency can be further improved. Furthermore, since the deformation operation is performed immediately after extrusion at a high temperature and while the deformation resistance is low, a large amount of deformation can be obtained with a small processing force, which eliminates the inconvenience of increasing the size of equipment due to the generation of large processing force. .
【図１】この発明を実施するための装置の一例を示す断
面図である。FIG. 1 is a sectional view showing an example of an apparatus for carrying out the invention.
【図２】図１の装置を用いた膨出成形時の状態を示す説
明的断面図である。FIG. 2 is an explanatory cross-sectional view showing a state during expansion molding using the apparatus of FIG. 1.
【図３】同じく膨出成形後の状態を示す説明的断面図で
ある。FIG. 3 is an explanatory cross-sectional view showing the state after expansion molding.
【図４】この発明を実施するための他の装置を示す断面
図である。FIG. 4 is a sectional view showing another apparatus for carrying out the invention.
【図５】図４の装置を用いて膨出成形を行う前の状態を
示す説明的断面図である。5 is an explanatory cross-sectional view showing a state before expansion molding is performed using the apparatus of FIG. 4. FIG.
【図６】同じく膨出成形時の状態を示す説明的断面図で
ある。FIG. 6 is an explanatory cross-sectional view showing the state during expansion molding.
【図７】同じく膨出成形後の状態を示す説明的断面図で
ある。FIG. 7 is an explanatory cross-sectional view showing the state after expansion molding.
Ａ…押出管 １…コンテナ ２…ステム ４…ダイス ５…ブロー成形金型 ７…膨出用空間 ８…ブロー成形用流体導入孔 A...Extruded tube 1...Container 2...Stem 4...Dice 5...Blow molding mold 7...Space for expansion 8...Fluid introduction hole for blow molding
Claims (1)
押出直後の高温状態のうちに、管内部へ導入した流体圧
力によって径大方向へ変形させることを特徴とする金属
押出管の膨出成形方法。[Claim 1] A metal extruded tube extruded from an extruder,
A method for expansion molding of an extruded metal tube, characterized in that the tube is deformed in the direction of increasing diameter by fluid pressure introduced into the tube while it is in a high temperature state immediately after extrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3022122A JPH04262819A (en) | 1991-02-15 | 1991-02-15 | Method for bulging metallic extruded tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3022122A JPH04262819A (en) | 1991-02-15 | 1991-02-15 | Method for bulging metallic extruded tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04262819A true JPH04262819A (en) | 1992-09-18 |
Family
ID=12074078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3022122A Pending JPH04262819A (en) | 1991-02-15 | 1991-02-15 | Method for bulging metallic extruded tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04262819A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0815985A1 (en) * | 1996-06-21 | 1998-01-07 | FIAT AUTO S.p.A. | Method and apparatus for the hot-forming of tubular box-type elements of any shape made from a light alloy |
| JP2003103327A (en) * | 2001-09-26 | 2003-04-08 | Honda Motor Co Ltd | Manufacturing method for hollow member |
-
1991
- 1991-02-15 JP JP3022122A patent/JPH04262819A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0815985A1 (en) * | 1996-06-21 | 1998-01-07 | FIAT AUTO S.p.A. | Method and apparatus for the hot-forming of tubular box-type elements of any shape made from a light alloy |
| JP2003103327A (en) * | 2001-09-26 | 2003-04-08 | Honda Motor Co Ltd | Manufacturing method for hollow member |
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