JPH0491823A - Method for forming short bent tube from short straight tube - Google Patents

Method for forming short bent tube from short straight tube

Info

Publication number
JPH0491823A
JPH0491823A JP20883990A JP20883990A JPH0491823A JP H0491823 A JPH0491823 A JP H0491823A JP 20883990 A JP20883990 A JP 20883990A JP 20883990 A JP20883990 A JP 20883990A JP H0491823 A JPH0491823 A JP H0491823A
Authority
JP
Japan
Prior art keywords
short
bent
hole
mandrel
tube
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
Application number
JP20883990A
Other languages
Japanese (ja)
Inventor
Yoichi Ito
洋一 伊藤
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.)
TSUTSUI KK
Original Assignee
TSUTSUI KK
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 TSUTSUI KK filed Critical TSUTSUI KK
Priority to JP20883990A priority Critical patent/JPH0491823A/en
Publication of JPH0491823A publication Critical patent/JPH0491823A/en
Pending legal-status Critical Current

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  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

PURPOSE:To improve forming quality, formability and productivity in a short bent tube and to reduce the maintenance cost of a forming device by inserting a mandrel into a bent through-hole formed by combining a movable die and fixed die, forcedly feeding a short straight tube into a clearance between the bent hole and the mandrel to manufacture a short bent tube, then, drawing the mandrel out of the bent hole, moving the movable die, opening the bent hole and taking out the short bent tube. CONSTITUTION:The mandrel 10 is inserted into the bent hole 6 formed by joining and combining the fixed die 2 and the movable die 1 for forming preparation, inserting the short straight tube 4 of billet into a pressing guide hole 8 of a pressing guide part 7, pressing a short straight tube 4 through a pressing rod 12 into the clearance 11 of the bent hole 6 to manufacture the short bent tube 5. Then, as soon as the short bent tube 5 is left in the fixed die 2 and the mandrel 10 is drawn out of the bent hole 6, the movable die 1 is elevated moved to open the upper half of the bent hole 6 and a short bent tube 5 on the fixed die 2 with a bent inside half exposed is extruded in the direction of an arrow B and taken out. Further, when the mandrel 10 is extracted, the tip of the short bent tube 5 strikes a locking part and is locked, consequently. the short bent tube 5 is left in the fixed die 2 as it is.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は、短直管を曲成加工して短曲管になし、配管部
品のエルボ管等を成形する[短直管から短曲管を成形す
る方法」に関するものである。1F従来の技術J 短直管から短曲管を成形する方法のうち、雄1f7のマ
ンドレル(芯金)と雌型の曲孔型を用いる成形方法とL
2て、特公昭54−23677号公報・特開平2−12
1721号公報のものが公知である。
Detailed Description of the Invention "Field of Industrial Application" The present invention is used to bend a short straight pipe into a short bent pipe to form a piping component such as an elbow pipe. ``Method for molding.'' 1F Conventional technology J Among the methods of forming short bent pipes from short straight pipes, forming methods using a male 1f7 mandrel (core metal) and a female bent hole mold, and L
2, Japanese Patent Publication No. 54-23677, Japanese Patent Application Publication No. 2-12
The one disclosed in Japanese Patent No. 1721 is publicly known.

即ち、前者の特公昭54−23677%公報のものは、
第5図参照、90’円弧の曲孔6を有する固定雌型14
と、成形用雄型のマンドレル1oと押出し棒15を相反
方向に有して、そのマンドレル1゜と押出し捧15を、
交互に曲孔6の出口と人[コがら出し入れして回転運動
をなす回転支持台16からなる成形装置を用い、第5図
(A)(B)(C)のように予めマンドレル10を挿入
した曲孔6の上方から素材の短直管4を圧入して短曲管
5に曲成し7 しがるのち、支持台16を回転させてマ
ンドレル1oを曲孔6から抜き出し、さらに支持台を回
転させて、曲孔6の入口から押出し棒15を挿入して曲
孔6に圧着している短曲管5を強制押出して取り出す方
法になっている。
In other words, the former publication of Special Publication No. 54-23677 is as follows:
See FIG. 5, fixed female mold 14 having a curved hole 6 with a 90' arc.
and a male molding mandrel 1o and an extrusion bar 15 in opposite directions, and the mandrel 1° and extrusion bar 15 are
A mandrel 10 is inserted in advance as shown in FIG. After press-fitting the short straight pipe 4 of the material from above the curved hole 6 and bending it into the short curved pipe 5, the support stand 16 is rotated to pull out the mandrel 1o from the bend hole 6, and then the support stand is rotated, and the pushing rod 15 is inserted from the entrance of the curved hole 6, and the short curved pipe 5 that is crimped into the curved hole 6 is forcibly pushed out and taken out.

一方、後者の特開平2−121.、72 ]−号のもの
は、第6図参照、前者と同一の曲孔6を有する固定雌型
】4と、押出し棒15を省略したマンドレル10つき回
転支持台16からなる成、形装置を用い、第6図(A)
(B)(C)のように予めマンドレル10を挿入した曲
孔6の上方から短直管4を圧入して短曲管5に曲成し、
しかるのち、支持台16を回転させてマンドレル10に
圧着した短曲管5を、マンドレル10と共に曲孔6から
抜き出し、続いて、その抜き出し姿勢でマンドレル10
に圧着している短曲管5の上端に係止棒17を挿入係合
し、さらに、支持台16を回転させることによってマン
ドレル10から短曲管5を抜き取る方法になっている。
On the other hand, the latter, JP-A-2-121. , 72 ]-, as shown in FIG. 6, has a forming device consisting of a fixed female die ] 4 having the same curved hole 6 as the former, and a rotary support 16 with a mandrel 10 omitting the extrusion rod 15. Figure 6 (A)
(B) As shown in (C), a short straight pipe 4 is press-fitted from above the bent hole 6 into which the mandrel 10 has been inserted in advance and bent into a short bent pipe 5.
Thereafter, the support base 16 is rotated to extract the short bent tube 5 crimped onto the mandrel 10 from the bent hole 6 together with the mandrel 10, and then the mandrel 10 is held in the extracted position.
The locking rod 17 is inserted and engaged with the upper end of the short bent pipe 5 which is crimped onto the mandrel 10, and the short bent pipe 5 is pulled out from the mandrel 10 by rotating the support base 16.

[発明が解決しようとする課題」 以−1−の公知の成形方法は、 ・雌型の曲孔6が固定−・体構造で分離作動せず、曲孔
6に圧着状態の短曲管5を曲孔6と強制摺擦させて取り
出す手段のため、その摺動移動によって、短曲管5の表
面に摺擦条痕の発生が避(、ツられず、短曲管5の品質
が低下する。そして、曲孔6内面の表面状態や潤滑状態
によって、その摺擦条痕が過大となるので、後工程修正
が必要になる。
[Problems to be Solved by the Invention] The following known forming method is as follows: - The female bent hole 6 is fixed - The short bent pipe 5 is crimped to the bent hole 6 without separating due to the body structure. Since the means for taking out the material by forcefully sliding it against the curved hole 6, the sliding movement prevents the generation of friction marks on the surface of the short curved tube 5 (and the quality of the short curved tube 5 deteriorates). Then, depending on the surface condition and lubrication condition of the inner surface of the curved hole 6, the rubbing scratches may become excessively large, so post-process correction is required.

・マンドレル10を曲孔6に挿入する加工準備から、成
形された短曲管5をマンドレル10・曲孔6から分離し
て取り出すまでの、回転支持台16の必要回転角は、例
えば90°曲げエルボ管成形において18o°以上必要
になり、その回転量、−よるロスタイムがあるので、成
形インターバルが長くなり、生産性が劣る。
- The necessary rotation angle of the rotary support base 16 from the processing preparation of inserting the mandrel 10 into the bent hole 6 to the time when the formed short bent pipe 5 is separated and taken out from the mandrel 10 and the bent hole 6 is, for example, 90° bending. Elbow tube molding requires 18 degrees or more, and there is loss time due to the amount of rotation, resulting in a long molding interval and poor productivity.

・曲孔6を有する前記の固定雌型は、一体のブロック部
材に曲孔6を貫通した構造からなると共に、短曲管5の
摺擦抜き出しによる損傷があるので、不良品の発生防止
のために、曲孔6のメンテナンスを短い周期で行う必要
があり、そのメンテナンスのつど固定雌型を分解して曲
孔表面の修復を行うことになるので、メンテナンスに多
くの時間と1数がかかり1産成形装置としCのメンテナ
ンス性が極めて劣る。
- The fixed female mold having the bent hole 6 has a structure in which the bent hole 6 is passed through an integral block member, and since the short bent pipe 5 is damaged by sliding and being pulled out, it is necessary to prevent the generation of defective products. In addition, it is necessary to perform maintenance on the curved hole 6 at short intervals, and each time the fixed female mold is disassembled and the surface of the curved hole is repaired, maintenance takes a lot of time and requires a large number of parts. As a production molding device, the maintainability of C is extremely poor.

本発明は、以」二の従来手段の難点を解消する新規の成
形方法を提供するものである。
The present invention provides a new molding method that overcomes the two drawbacks of the conventional methods.

[課題を解決するための手段] 以にの技術課題を解決する本発明の成形方法は、「マン
1〜レルを挿入した曲孔に、短直管を圧入し、て短曲管
を成形するにおいて。
[Means for Solving the Problems] The forming method of the present invention that solves the technical problems described above is as follows: ``A short straight pipe is press-fitted into a bent hole into which a mandrel is inserted, and then a short bent pipe is formed. In.

短直管の曲げ中立面に沿って分割した「該短直管の曲げ
圧縮側のii■動型」と「該短直管の曲げ引張り側の固
定型」の合体によって、該可動型と固定型が各半部分を
受け持つ貫通曲孔を形成すると共に、該曲孔に出入自在
のマンドレルを装着し、該曲孔と該マンドレルの間隙に
短直管を圧入して短曲管に曲成し、しかるのち、該短曲
管を前記固定型に残して該マンドレルを前記曲孔から抜
き出すと共に、前記可動型を移動して前記曲孔を開放し
、成形された短曲管を取り出す成形方法」になっている
The movable type and A fixed mold forms a penetrating bent hole that takes care of each half, and a mandrel that can move in and out is attached to the bent hole, and a short straight pipe is press-fitted into the gap between the bent hole and the mandrel to bend it into a short bent pipe. Then, the mandrel is extracted from the bent hole while leaving the short bent tube in the fixed mold, and the movable mold is moved to open the bent hole and the formed short bent tube is taken out. "It has become.

「作用」 以りの構成からなる本発明の成形方法は[短直管の曲げ
圧縮側の可動型」と「短直管の曲げ引張り側の固定型」
の合体によって成形1へき短直管の雌型の曲孔に構成し
、その曲孔に挿入したマンドレルと該曲孔の間隙に、短
直管を圧入しC1曲成し、成形された短曲管を該固定型
に残してマンドレルを抜き取ると共に、該ll■l型動
移動させて曲孔を開放し2て取り出すので。以上の作用
がある。。
"Function" The forming method of the present invention consists of a "movable type on the bending and compression side of a short straight pipe" and a "fixed type on the bending and tension side of a short straight pipe".
A short straight pipe is formed into a female-shaped bent hole by combining the two, and a short straight pipe is press-fitted into the gap between the mandrel inserted into the bent hole and the bent hole to form a C1 bend. The tube is left in the fixed mold and the mandrel is removed, and the mold is moved to open the bent hole and taken out. There are the above effects. .

即ち、 ・成形された短曲管を取り出すための、曲孔との摺擦が
全くなく、取り出し摺擦に基づく短曲管の表面条痕と曲
孔の摺擦損耗が発生しない6、・成形型が可動型と固定
型の合体からなるものの、この可動型と固定型は、短直
管の曲げ中N7面に沿って接合するので、成形された短
曲管の曲げ中立面(曲成された左右側面の中央)に、型
接合によるパートライン発性のおそれがなく、」−記の
表面条痕防止と併せて、短曲管の曲成表面が美麗になる
That is, - There is no sliding friction with the curved hole to take out the formed short curved pipe, and no scratches on the surface of the short curved pipe and friction wear of the curved hole occur due to the sliding friction of taking out 6. - Molding Although the mold is a combination of a movable mold and a fixed mold, the movable mold and fixed mold are joined along the N7 plane during bending of the short straight pipe, so the bending neutral plane (bending curve) of the formed short pipe There is no risk of part lines occurring at the center of the left and right sides (center of the left and right sides) due to mold joining, and in addition to preventing surface scratches as described in "-", the curved surface of the short curved pipe becomes beautiful.

・短曲管成形のワンサイクルにおけるマンドレルの必要
回転量が、例えば90’曲げ短曲管成形では約90’ 
となり、前記の従来手段に対比して半減するので、成形
ワン勺イクルの所要時間が短縮できる、 ・前記の移動型と固定型からなる成形型は、 MiJ記
のとおり損耗・損傷が少なく、子の北9曲礼開放姿勢が
とれるので、前記の従来ト段に対」1、し、て、メンテ
ナンスのRItJJが長くなると共に、メンテナンスが
極め1やり易くなる、 「実施例」 以ド、単・曲げ半径の5→0°曲げ短曲管(エルボ管)
の成形に応用した実施例に基づいて詳しく説明する。ま
ず、この実施例の成形装置な示す第2へ・4図を参照し
て、この成形装置は素材の短直管4を短#J’ff5に
曲成するときの曲げ中立I¥iix:3に沿って接合す
るijJ動型1と固定型2の組合せになっており、可動
型]、は短直管4の曲げ圧縮側に位置し、で、第2・3
図参照、成形すべき短曲管5の圧縮側の形状に対応した
半円溝3Aを、固定型2との接合面に有し、所要メ、ト
ロークJ−昇降fii能にな一ンでいる。1 一方、固定型2は、第2・4図参照、成形すべき短曲管
53の引張り側の形状に対応した半円7113I3を可
動型1の半円溝3ノ〜ど対向接合し、移動ヤ11と固定
型2が合体セットすると、半円溝3 A 3Bが合体し
て合体姿勢の可動型1.と固定〒12の−1−端の入口
から側方の出1−]に1通する円形の曲孔(−3を形成
し5、この曲孔6が短曲管5の成型#型を構成している
・For example, the required rotation amount of the mandrel in one cycle of short bend pipe forming is approximately 90′ for short bend pipe forming with a 90′ bend.
The time required for one cycle of molding can be reduced by half compared to the conventional method described above. - The mold consisting of the movable mold and fixed mold has less wear and damage as described in MiJ, and Since it is possible to take the open north ninth bend posture, compared to the conventional method mentioned above, the maintenance time is longer and the maintenance is extremely easier. Short bent pipe (elbow pipe) with bending radius of 5→0°
This will be explained in detail based on an example applied to molding. First, referring to Figures 2 and 4 showing the forming apparatus of this embodiment, this forming apparatus is used when bending the short straight pipe 4 of the raw material into a short #J'ff5 bending neutral I\iix: 3 It is a combination of an ijJ moving type 1 and a fixed type 2 that are joined along the .
As shown in the figure, a semicircular groove 3A corresponding to the shape of the compression side of the short curved pipe 5 to be formed is provided on the joint surface with the fixed mold 2, so that it can be adjusted to the desired stroke J-elevating ability. . 1. On the other hand, the stationary mold 2, as shown in Figs. 2 and 4, joins a semicircle 7113I3 corresponding to the shape of the tension side of the short bent pipe 53 to be formed to the semicircular groove 3 of the movable mold 1, and moves it. When the roller 11 and the fixed mold 2 are combined and set, the semicircular grooves 3A and 3B are combined and the movable mold 1. A circular curved hole (-3 is formed 5 and this curved hole 6 constitutes the mold # shape of the short curved pipe 5. are doing.

なお、この実施例の可動型1には、素材の短直管4の圧
入案内部7か=一体に載設され、このハ・入寮内部7に
は曲孔6の1;端入1:、l’T !、″連通ずるスト
レート孔の圧入案内孔8が1−下方向に設けである。
In addition, in the movable mold 1 of this embodiment, the press-fitting guide part 7 of the short straight pipe 4 of the material is mounted integrally, and in this dormitory interior 7, the curved hole 6 1; l'T! , ``The press-fit guide hole 8, which is a straight hole that communicates, is provided in the 1-down direction.

また、固定型2の半円溝:3Bの出口には、後述する短
曲管5の成形後り、二、成形し7た矩1111管F)を
半円溝3 T3に残すための係止部9が設けられζいる
In addition, at the exit of the semicircular groove 3B of the fixed mold 2, after forming the short bent pipe 5, which will be described later, there is a lock for leaving the formed rectangular 1111 pipe F) in the semicircular groove 3 T3. A section 9 is provided.

そして、前記の曲孔6に出入自在の曲捧からなる成形雄
型のマンドレル10が設けられ、第2図のように曲孔6
に挿入されると、曲孔(3とマンドレル10との間に−
様な間隙11が生じ、この間隙11に短直管4を圧入〔
7て所要形状に曲成する構造になっている。
Then, a molded male mandrel 10 made of a curved shaft that can freely move in and out is provided in the curved hole 6, and as shown in FIG.
When inserted into the mandrel, a -
A gap 11 is created, and the short straight pipe 4 is press-fitted into this gap 11.
7. It has a structure that can be bent into the desired shape.

以り、の成形装置を用いで、以下のように成形される。The following molding is performed using the following molding apparatus.

即ち、そのf、順を示す第1図を参照し、て、・まず、
第1図(A)のように、固定型2と可動型1を接合合体
すると共に、曲孔6にマンドレル1Ωを挿入して成形準
備し、圧入案内部7の圧入案内孔8に、素材の短直管4
を挿入する。
That is, with reference to FIG. 1 showing the order of f, first,
As shown in FIG. 1(A), the fixed mold 2 and the movable mold 1 are joined together, and a 1Ω mandrel is inserted into the curved hole 6 to prepare for molding. Short straight pipe 4
Insert.

・続いて、第1−図(I3)のように、圧入ロンド12
によ、って短直管4を曲孔6の間隙目に圧入し、短曲管
5を曲成する。
・Subsequently, as shown in Figure 1 (I3), press-fit iron 12
Accordingly, the short straight pipe 4 is press-fitted into the gap of the bent hole 6, and the short bent pipe 5 is bent.

・ぞして、第1図((ニ)のように、短曲管5を固定型
2に残してマンドレル10を曲孔6から抜き出ずと同時
に、可動型1を」−昇移動させて曲孔6の」、半を開放
し2曲げた内側半分を露出した固定型2上の短曲管5を
、図示矢印B方向に押出して取り出す。なお、前記のマ
ンドレル10の抜き出しのとき、短曲管5の前端が係止
部9と衝合係止するので、短曲管5はそのまま固定型2
に残される。
・As shown in FIG. 1 ((d)), leave the short bent pipe 5 in the fixed mold 2 and do not pull out the mandrel 10 from the bent hole 6, and at the same time move the movable mold 1 upward. The short bent pipe 5 on the fixed mold 2 with half of the bent hole 6 opened and the bent inner half exposed is pushed out in the direction of the arrow B shown in the figure. Since the front end of the bent pipe 5 collides with and locks with the locking part 9, the short bent pipe 5 is attached to the fixed type 2 as it is.
left behind.

・そして、短曲管5の取り出し後、第1図(A、 )の
状態に復帰して次の加工サイクルがなされる。
- After taking out the short bent pipe 5, the state shown in FIG. 1 (A, ) is restored and the next processing cycle is performed.

以上の実施例は前記の作用があり、成形された短曲管5
は取り出しのための曲孔(3との摺擦がないので、表面
の摺擦条痕が少なく(短直管4を曲孔6に圧入するとき
の摺擦条痕は従来物と同等に発生する)従来物より表面
品質が向上すると共に、同一への成形条件における成形
サイクルの時間が、前記の従来手段より約10%短縮さ
れた。
The above embodiment has the above-mentioned effect, and the formed short bent pipe 5
Since there is no rubbing with the curved hole (3) for taking out, there are fewer scratches on the surface (sliding scratches when press-fitting the short straight pipe 4 into the curved hole 6 are the same as with conventional pipes). ) The surface quality was improved compared to the conventional method, and the molding cycle time under the same molding conditions was shortened by about 10% compared to the conventional method.

そして、曲孔6のメンテナンスか簡易化されるので、成
形型メンテナンスのための停止回数と停止時間およびメ
ンテナンス玉数が格段に減、少し、メンテナンスコスト
が従来手段の約】−15に低減した。
In addition, since the maintenance of the curved hole 6 is simplified, the number of stops for mold maintenance, the stop time, and the number of maintenance balls are significantly reduced, and the maintenance cost is reduced to about 15 times lower than that of the conventional method.

なお、本発明の成形装置に用いるi工動型1と固定型2
の接合部位は、第2図実施例のようにスリット18を設
けるか、或は密着接合(図示しない)のいずれであって
も良い。
Note that the i-type movable mold 1 and fixed mold 2 used in the molding apparatus of the present invention
The joint portion may be provided with a slit 18 as in the embodiment shown in FIG. 2, or may be a tight joint (not shown).

「発明の効果」 以」−の説明のとおり、本発明の[短直管から短曲管を
成形する方法」は、短曲管の成形品質と成形生産性を向
」ニすると共に、成形装置のメンテナンスコストを格段
に低減する多大の効果がある。
``Effects of the Invention'' As explained below, the ``method for forming a short curved tube from a short straight tube'' of the present invention not only improves the forming quality and productivity of short curved tubes, but also improves the forming equipment. This has the great effect of significantly reducing maintenance costs.

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

第1図(A、)(B )(C) :本発明の成形方法の
一実施例の手順を示す正面図、第2図:第1図実施例の
成形装置の概念図を示し、(A)はその正面図、(B)
は(A)のAA断面図、第3図:第2図の成形装置の可
動型を示し、(A)はその正面図、(B)はその側面図
、(C)はその平面図、第4図:第2図の成形装置の固
定型を示し、(A)はその正面図、(B)はその側面図
、(C)はその平面図、第5図(A )(B )(C)
 :従来手段の成形方法と手順を示す正面図、第6図(
A)(B)(C):従来手段の成形方法と手順を示す正
面図 主な符号、1:可動型、2:固定型、3A3B :半円
溝、4:短直管、5:短曲管、6:曲孔、7:圧入案内
部、8:圧入案内孔、9:係止部、10:マンドレル、
11:間隙、12:圧入ロッド、13:曲げ中立面、1
8ニスリツト
Figure 1 (A, ) (B) (C): A front view showing the procedure of an embodiment of the molding method of the present invention, Figure 2: A conceptual diagram of the molding apparatus of the embodiment of Figure 1, (A ) is its front view, (B)
Figure 3 shows the movable mold of the molding apparatus in Figure 2, where (A) is its front view, (B) is its side view, and (C) is its top view. Figure 4: Shows the fixed mold of the molding apparatus in Figure 2, (A) is its front view, (B) is its side view, (C) is its top view, and Figures 5 (A), (B), (C). )
:Front view showing the molding method and procedure of conventional means, Fig. 6 (
A) (B) (C): Front view showing the forming method and procedure of conventional means Main symbols: 1: Movable type, 2: Fixed type, 3A3B: Semicircular groove, 4: Short straight pipe, 5: Short bend Pipe, 6: Bent hole, 7: Press-fit guide section, 8: Press-fit guide hole, 9: Locking section, 10: Mandrel,
11: Gap, 12: Press-fitting rod, 13: Bending neutral plane, 1
8 Nislist

Claims (1)

【特許請求の範囲】[Claims] (1)マンドレルを挿入した曲孔に、短直管を圧入して
短曲管を成形するにおいて、 短直管の曲げ中立面に沿って分割した「該短直管の曲げ
圧縮側の可動型」と「該短直管の曲げ引張り側の固定型
」の合体によって、該可動型と固定型が各半部分を受け
持つ貫通曲孔を形成すると共に、該曲孔に出入自在のマ
ンドレルを装着し、該曲孔と該マンドレルの間隙に短直
管を圧入して短曲管に曲成し、しかるのち、該短曲管を
前記固定型に残して該マンドレルを前記曲孔から抜き出
すと共に、前記可動型を移動して前記曲孔を開放し、成
形された短曲管を取り出すことを特徴とする短直管から
短曲管を成形する方法。
(1) When forming a short straight pipe by press-fitting it into a bent hole into which a mandrel has been inserted, a "moveable section on the bending compression side of the short straight pipe" that is divided along the mid-bending plane of the short straight pipe is formed. By combining the mold and the fixed mold on the bending and pulling side of the short straight pipe, the movable mold and the fixed mold form a penetrating hole in which each half takes charge, and a mandrel that can freely move in and out is attached to the bent hole. A short straight pipe is press-fitted into the gap between the bent hole and the mandrel and bent into a short bent pipe, and then the mandrel is pulled out from the bent hole while leaving the short bent pipe in the fixed mold, A method for forming a short curved tube from a short straight tube, characterized in that the movable mold is moved to open the curved hole and the formed short curved tube is taken out.
JP20883990A 1990-08-06 1990-08-06 Method for forming short bent tube from short straight tube Pending JPH0491823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20883990A JPH0491823A (en) 1990-08-06 1990-08-06 Method for forming short bent tube from short straight tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20883990A JPH0491823A (en) 1990-08-06 1990-08-06 Method for forming short bent tube from short straight tube

Publications (1)

Publication Number Publication Date
JPH0491823A true JPH0491823A (en) 1992-03-25

Family

ID=16562961

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20883990A Pending JPH0491823A (en) 1990-08-06 1990-08-06 Method for forming short bent tube from short straight tube

Country Status (1)

Country Link
JP (1) JPH0491823A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL424584A1 (en) * 2018-02-13 2019-08-26 Atb Ziółkowska Spółka Komandytowa Method for making products bent from hot extruded sections

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54143759A (en) * 1978-04-30 1979-11-09 Sumitomo Metal Ind Ltd Method and apparatus for manufacture curved tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54143759A (en) * 1978-04-30 1979-11-09 Sumitomo Metal Ind Ltd Method and apparatus for manufacture curved tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL424584A1 (en) * 2018-02-13 2019-08-26 Atb Ziółkowska Spółka Komandytowa Method for making products bent from hot extruded sections

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