JPH04262820A - Method for expanding metallic extruded tube - Google Patents

Abstract

PURPOSE:To obtain a large amount of deformation with a small working force to eliminate the need for a large-sized equipment by inserting a tube expanding jig from the outlet side of an extruding machine into the inside of the tube under a high temperature state directly after extruding in the metallic extruded tube extruded from the extruding machine. CONSTITUTION:A stem 2 is advanced to extrude the tube A to be extruded, after extruding by a prescribed length, then, a tube expanding jig 6 is advanced to the direction of a die 4 and its tip is inserted into the opening part of the tube end of the extruded tube. The tube expanding jig is advanced further and the extruded tube is deformed in a tapered state after the outer shape of the tube expanding head part 6a. The extruded tube keeps a high temperature state directly after it is extruded and is made easy to deform, therefore, the extruded tube can be deformed easily by a small advancing force given to the tube expanding jig. As a result, the manufacturing time of the formed part is reduced and the productivity can be improved.

Description

【発明の詳細な説明】[Detailed description of the invention]

【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拡管方法に関
する。[Industrial Application Field] This invention is applicable to automobile parts, machinery,
This invention relates to a method for expanding extruded pipes of aluminum (including alloys thereof, the same shall apply hereinafter) and other metals used for building parts and the like.

【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、その長さ方向にテーパ状等に拡管した形状を有する
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 is tapered or expanded in the length direction.

【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、
長さ方向においてテーパ状拡管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材をＴ１　処理したの
ち焼鈍し、次いで管端から押出管内に拡管治具を挿入す
ることによりテーパ状に拡管変形せしめたのち、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 tapered expansion section in the length direction, after the extrusion process is finished, the extruded material is subjected to T1 treatment, annealed, and then expanded into a tapered shape by inserting a tube expansion jig into the extruded tube from the tube end. After deformation, 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、拡管に際して
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. Furthermore, there is a problem in that the deformation resistance of the extruded tube is large during tube expansion, and therefore 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、拡管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拡管方法の提供を目的とする
。The present invention has been made in view of the above technical background, and provides an extruded metal tube that can simplify the tube expansion process and can be deformed greatly with a small force without causing an increase in the size of the equipment. The purpose is to provide a method for expanding tubes.

【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、拡管成形を実施しよう
というものである。[Means for Solving the Problems] In order to achieve the above object, the present invention utilizes the heat during extrusion to carry out tube expansion forming immediately after extrusion in a high temperature state where plastic deformation is easy. It is.

【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、押出機出側
から管内部へ拡管治具を挿入することによって拡管する
ことを特徴とする金属押出管の拡管方法を要旨とする。That is, the present invention is characterized in that an extruded metal tube extruded from an extruder is expanded by inserting a tube expansion jig into the tube from the exit side of the extruder while it is in a high temperature state immediately after extrusion. The main subject of this paper is a method for expanding metal extruded pipes.

【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、押出機出側から管内部へ挿入した拡管治
具によって拡管変形させるから、押出工程と並行して拡
管変形加工が行われる。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、高温状態のうちに拡管を行うから
、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 tube is expanded and deformed by a tube expansion jig inserted into the tube from the exit side of the extruder, so that the tube expansion and deformation 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 tube is expanded while it is still 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装置の一例を示
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。またダイス（４）の出側にはプラテン（５
）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、プラテン（
５）を通過して送られる。FIG. 1 shows an example of an apparatus for carrying out the present invention. In these figures, (1) is a container,
(2) is a stem, (3) is an aluminum billet (in this example, a 500°C, 7-inch billet of A6063 alloy is used), and the billet (3) is loaded into the container (1), and As the stem advances, a pressing force (1800 tons in this embodiment) is applied to the exit side. (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). Also, on the exit side of the die (4) is a platen (5).
) are placed. Therefore, the billet in the container (1) is extruded from the die (4) into the extrusion tube (A) (in this example, the outer diameter is 50 mm and the wall thickness is 1 mm), and then the billet is extruded from the platen (
5).

【００１１】前記プラテンの出側には、拡管治具（６）
が押出管（Ａ）と同一軸線上においてかつ軸線方向に進
退自在に配置されている。この拡管治具（６）は、ダイ
ス（４）側に向かって径小となる円錐状の拡管頭部（６
ａ）を有している。[0011] A tube expansion jig (6) is provided on the outlet side of the platen.
is arranged on the same axis as the extruded tube (A) and can move forward and backward in the axial direction. This tube expansion jig (6) has a conical tube expansion head (6) whose diameter decreases toward the die (4) side.
It has a).

【００１２】次に、図１に示した装置を用いてアルミニ
ウム押出管（Ａ）の拡管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）を押出す。所定長さ押出
したのち、拡管治具（６）をダイス（４）方向へ前進さ
せてその先端を押出管（Ａ）の管端開口部に挿入したの
ち、さらに前進させて押出管（Ａ）を拡管頭部（６ａ）
の外形状に添わせてテーパ状に変形させる。押出管（Ａ
）は押出直後でいまだ高温状態を維持しており変形容易
となっているから、拡管治具（６）に与えるわずかの前
進力で押出管（Ａ）を容易に変形させることができる。 なお、要すれば拡管治具（６）の押出管（Ａ）への挿入
後も押出管（Ａ）の押出を継続させても良いし、拡管治
具（６）を固定したまま押出管（Ａ）の押出圧力で管内
に拡管治具（６）を導入せしめても良い。。Next, a method for expanding an extruded aluminum tube (A) using the apparatus shown in FIG. 1 will be described. First, the stem is advanced to extrude the extruded tube (A). After extruding a predetermined length, the tube expanding jig (6) is advanced toward the die (4) and its tip is inserted into the tube end opening of the extruded tube (A), and then further advanced to form the extruded tube (A). Expand the tube head (6a)
It is deformed into a tapered shape according to the external shape of. Extruded tube (A
) is still in a high temperature state immediately after extrusion and is easily deformed, so the extruded tube (A) can be easily deformed by a slight forward force applied to the tube expansion jig (6). If necessary, extrusion of the extruded tube (A) may be continued even after the tube expansion jig (6) is inserted into the extruded tube (A), or the extruded tube (A) may be continued with the tube expansion jig (6) fixed. A tube expansion jig (6) may be introduced into the tube using the extrusion pressure in A). .

【００１３】なお上記実施例では、押出管（Ａ）をテー
パ状に拡管させる場合を示したが、拡管部の形状は上記
に限定されるものではない。In the above embodiment, the extruded tube (A) is expanded into a tapered shape, but the shape of the expanded portion is not limited to the above.

【００１４】[0014]

【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
拡管治具を挿入することによって拡管変形させるから、
拡管工程を押出工程と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拡管工程を不要となし
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拡管操作を行うから
、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 utilizes the high temperature state immediately after extrusion to expand and deform the extruded tube by inserting a tube expansion jig into the inside of the tube while it is easily deformed.
The tube expansion step can be performed simultaneously with the extrusion step, and the tube expansion step, which is conventionally 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 tube expansion 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, and the inconvenience of increasing the size of equipment due to the generation of large processing force can be eliminated.

【図面の簡単な説明】[Brief explanation of the drawing]

【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.

【符号の説明】[Explanation of symbols]

Ａ…押出管 １…コンテナ ２…ステム ４…ダイス ６…拡管治具 A...Extruded tube 1...Container 2...Stem 4...Dice 6...Pipe expansion jig

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】　　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、押出機出側から管内部へ
拡管治具を挿入することによって拡管することを特徴と
する金属押出管の拡管方法。[Claim 1] A metal extruded tube extruded from an extruder,
A method for expanding a metal extruded tube, which comprises expanding the tube by inserting a tube expansion jig into the tube from the exit side of the extruder while the tube is in a high temperature state immediately after extrusion.