JPH1190528A - Manufacture of bent and turned tube - Google Patents
Manufacture of bent and turned tubeInfo
- Publication number
- JPH1190528A JPH1190528A JP9253117A JP25311797A JPH1190528A JP H1190528 A JPH1190528 A JP H1190528A JP 9253117 A JP9253117 A JP 9253117A JP 25311797 A JP25311797 A JP 25311797A JP H1190528 A JPH1190528 A JP H1190528A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- bent
- die
- diameter
- turned
- 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- Withdrawn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]
【発明の属する技術分野】本発明は折曲反転管の製造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bent inversion tube.
【０００２】[0002]
【従来の技術】従来、金属管の一側部を折曲反転した折
曲反転管の製造方法として、例えば、図１４及び図１５
に示すような製造方法が提案されている。2. Description of the Related Art Conventionally, as a method of manufacturing a bent inversion tube in which one side of a metal tube is bent, for example, FIGS.
The following production method has been proposed.
【０００３】この製造方法は、先ず図１４に示すよう
に、管１０１の一端部を管軸と直交する方向に折曲拡開
してフレア部１０２を形成し、次で、そのフレア部１０
２をダイス１０３と押さえ型１０４で挟持し、この挟持
状態で図１５に示すようにその管１０１に荷重Ｐ1 を加
えてその管１０１を管軸方向に押して折曲反転部１０５
を形成するようにしたものである。In this manufacturing method, first, as shown in FIG. 14, one end of a tube 101 is bent and expanded in a direction perpendicular to the tube axis to form a flare portion 102. Next, the flare portion 10 is formed.
2 was sandwiched between the pressing mold 104 and die 103, bent inverting unit 105 by pressing the tube 101 in the axial direction of the tube by a load P 1 in addition to the tube 101 as shown in FIG. 15 in this clamped state
Is formed.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の製造方法に
おいては、そのフレア部１０２を形成するには通常、斜
めフレア部を形成する工程と、その後にこれを管軸と直
交する方向に成形する工程の２工程を要する。In the above-mentioned conventional manufacturing method, the flare portion 102 is usually formed by forming a slanted flare portion and thereafter forming the slanted flare portion in a direction perpendicular to the tube axis. Two steps are required.
【０００５】また、上記のフレア部形成後における折曲
反転工程においては、フレア部１０２をこれがダイス１
０３内に滑り込まないようにダイス１０３と押さえ型１
０４で強固に挟持する必要があり、その型構造及び設備
構造が大型かつ複雑なものとなり、型費、設備費が嵩む
問題がある。In the bending reversal step after the formation of the flare portion, the flare portion 102 is
Die 103 and holding mold 1 so as not to slip into 03
04 must be firmly clamped, and its mold structure and equipment structure become large and complicated, and there is a problem that mold cost and equipment cost increase.
【０００６】そこで本発明は、上記従来の製造方法に比
べて工程が少なくかつ低コストで製造できる折曲反転管
の製造方法を提供することを目的とするものである。Accordingly, an object of the present invention is to provide a method for manufacturing a bent inversion tube which can be manufactured with fewer steps and at lower cost than the conventional manufacturing method.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
めに、請求項１記載の第１の発明は、管端に外向きのカ
ール部を形成し、その後にカール部を管軸方向の管部側
へ押圧移動させて折曲反転部を形成することを特徴とす
るものである。According to a first aspect of the present invention, an outward curl portion is formed at a tube end, and thereafter, the curl portion is formed in the axial direction of the tube. It is characterized in that a bent reversal portion is formed by pressing and moving to the tube portion side.
【０００８】本発明においては、カール部の剛性が大き
いため、該カール部を挟持することなく単に軸方向へ押
圧のみでそのカール部が軸方向へ移動し、管部が折曲反
転されて折曲反転部が形成される。In the present invention, since the curl portion has high rigidity, the curl portion moves in the axial direction only by being pressed in the axial direction without sandwiching the curl portion, and the curl portion moves in the axial direction. A music reversal part is formed.
【０００９】請求項２記載の第２の発明は、管に大径管
部とテーパ部と小径管部を連続して形成する工程と、大
径管部の管端に外向きのカール部を形成する工程と、こ
れらの工程後に、カール部を管軸方向の管部側へ押圧移
動させて折曲反転部を形成工程とからなることを特徴と
するものである。According to a second aspect of the present invention, there is provided a step of continuously forming a large-diameter pipe portion, a tapered portion, and a small-diameter pipe portion on a pipe; The method is characterized by comprising a forming step and, after these steps, a step of forming a bent inversion portion by pressing and moving the curled portion toward the tube portion in the tube axis direction.
【００１０】本発明においては、更に、小径管部と折曲
反転された大径管部とがテーパ部で連結され、かつ、小
径管部と大径管部との間の空隙が大きい折曲反転管が製
造される。[0010] In the present invention, the small-diameter tube and the bent large-diameter tube are connected by a tapered portion, and the gap between the small-diameter tube and the large-diameter tube is large. An inversion tube is manufactured.
【００１１】請求項３記載の第３の発明は、上記第１又
は第２の発明において、カール部を管軸方向の管部側へ
移動させる工程を、カール部の外径より小径でかつ管の
外径より大径のダイス穴を有する折り返し加工用ダイス
を用い、カール部を上記ダイス穴の周端縁に位置させて
管部又は折り返し加工用ダイスを管軸方向へ押圧して行
うようにしたものである。According to a third aspect of the present invention, in the first or second aspect, the step of moving the curl portion toward the tube portion in the tube axis direction is performed by using a tube having a diameter smaller than the outer diameter of the curl portion. Using a folding die having a die hole with a diameter larger than the outer diameter of the die, the curl portion is positioned at the peripheral edge of the die hole, and the tube portion or the folding die is pressed in the tube axis direction. It was done.
【００１２】本発明においては、更に、折り返し加工用
ダイスにおけるダイス穴の周端縁にカール部を係止させ
て押圧移動させるのみで折曲反転部が形成される。Further, in the present invention, the bent reversal portion is formed only by locking the curl portion to the peripheral edge of the die hole in the folding die and pressing and moving the curl portion.
【００１３】[0013]
【発明の実施の形態】図１乃至図１３に示す実施例に基
づいて本発明の実施の形態について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on the embodiments shown in FIGS.
【００１４】図１乃至図５は第１実施例の製造方法を示
す。本実施例は、先ず、図１に示すように、金属管から
なる素管１の一端１ａをカール用ダイス２の型穴３の内
側面３ａに位置させる。この型穴３は、上面が開口した
半円形断面でかつ環状に形成されている。次で、図２に
示すように、素管１の他端１ｂに素管１を折り曲げるこ
とが可能な荷重Ｐ2 を管軸方向に加え、素管１の一端１
ａを型穴３に沿って外側へ屈曲してカーリング加工を行
い、管の全周に外向きのカール部４を形成する。FIGS. 1 to 5 show a manufacturing method of the first embodiment. In this embodiment, first, as shown in FIG. 1, one end 1 a of a base tube 1 made of a metal tube is positioned on an inner side surface 3 a of a mold hole 3 of a curling die 2. The mold cavity 3 has a semicircular cross section with an open upper surface and is formed in an annular shape. In the next, as shown in FIG. 2, of a load P 2 capable of bending the blank tube 1 to the other end 1b of the blank tube 1 in the axial direction of the tube, one end 1 of base pipe 1
a is bent outward along the mold hole 3 to perform a curling process to form an outward curled portion 4 on the entire circumference of the tube.
【００１５】次に、図３に示すように、上記のように成
形されたカール部４が引っ掛かる内径、すなわち、カー
ル部４の外径Ｒ2 より小径でかつ素管１の外径Ｒ3 より
大径の内径Ｒ1 に形成されたダイス穴５ａを有する折り
返し加工用ダイス５に対し、カール部４を図３のように
ダイス穴５ａに位置させて素管１の他端１ｂに素管１を
折り曲げることが可能な荷重Ｐ3 を管軸方向の折り返し
加工用ダイス５側へ加える。このとき、カール部４はそ
のカール形状により剛性が大きいため、素管１の折り返
しが可能な荷重Ｐ3 によってもカール部４はダイス穴５
ａ内に滑り込まない。実験の結果、例えばカール部４の
板厚が１．２ｍｍで、径がφ４８．６ｍで、材質がＳＵ
Ｓ４０９の場合、同サイズ、同材の前記従来のフレア１
０２と比べると、剛性が３８％向上し、最大応力が３４
％減少し、ダイス穴５ａ内には滑り込まなかった。Next, as shown in FIG. 3, the inner diameter at which the curl portion 4 formed as described above is caught, that is, the outer diameter R 2 of the curl portion 4 is smaller than the outer diameter R 3 of the raw tube 1. to folding processing die 5 having a die hole 5a formed in the inner diameter R 1 of the large diameter base pipe 1 the curl portion 4 at the other end 1b of the base pipe 1 is positioned in the die hole 5a as shown in FIG. 3 a load P 3 that can be folded Add to the tube axis direction of the folding working die 5 side. At this time, since the curl portion 4 high rigidity by its curled shape, curl portion 4 by the load P 3 capable wrapping blank pipe 1 is die hole 5
Do not slip into a. As a result of the experiment, for example, the curl portion 4 has a thickness of 1.2 mm, a diameter of 48.6 m, and a material of SU.
In the case of S409, the conventional flare 1 of the same size and same material
Compared to 02, the rigidity is improved by 38% and the maximum stress is 34
%, And did not slip into the die hole 5a.
【００１６】この荷重Ｐ3 により素管１が図４に示すよ
うに折曲反転し、塑性変形した折曲反転部６が形成され
る。なお、この荷重Ｐ3 による素管１の軸方向への移動
量（図４において下降量）により折曲反転部６の長さが
設定され、その移動量を長くすることにより折曲反転部
６を長くすることができる。The load P 3 causes the tube 1 to bend and invert as shown in FIG. 4 to form a bent and inverted portion 6 which is plastically deformed. Incidentally, the amount of movement in the axial direction of the mother tube 1 by the load P 3 (descent amount in FIG. 4) by the length of the bent reversing unit 6 is set, bent inverting unit by increasing the amount of movement 6 Can be lengthened.
【００１７】そして、折り返し加工用ダイス５より脱型
することにより、図４に示すような、一方の端部が二重
管で、かつその外管の端部にカール部４を有する折曲反
転管が得られる。Then, by removing the mold from the folding die 5, as shown in FIG. 4, a bent tube having one end portion of a double tube and a curl portion 4 at the end of the outer tube is provided. A tube is obtained.
【００１８】また、必要に応じて、図４に示す折り返し
加工後、図５に示すようにカール部４を、押型７により
荷重Ｐ4 を加えて偏平にし、表裏片が密着したフランジ
８に形成してもよい。Further, if necessary forming, after folding processing shown in FIG. 4, the curl portion 4 as shown in FIG. 5, the flattened by applying a load P 4 by pressing die 7, a flange 8 which front and back pieces are in close contact May be.
【００１９】図６乃至図１１は第２実施例の製造方法を
示す。本実施例は、先ず図６に示すような金属管からな
る素管９の他端側（カール部が形成される側と反対の
側）を縮管加工して図７に示すような小径管部１０と大
径管部１１に形成し、かつ、小径管部１０と大径管部１
１間にテーパ部１２を形成する。或いは、素管９の一端
側（カール部が形成される側）を拡管加工して小径管部
１０と大径管部１１に形成し、かつ小径管部１０と大径
管部１１間にテーパ部１２を形成する。この縮管加工方
法としては、例えばスピニング加工或いはダイスによる
絞り加工により行い、また拡管加工は例えばパンチによ
る拡げ加工で行う。FIGS. 6 to 11 show a manufacturing method according to the second embodiment. In the present embodiment, first, the other end side (the side opposite to the side where the curled portion is formed) of the metal tube 9 shown in FIG. Formed in the portion 10 and the large-diameter tube portion 11, and the small-diameter tube portion 10 and the large-diameter tube portion 1
A tapered portion 12 is formed between the two. Alternatively, one end side (the side on which the curled portion is formed) of the base tube 9 is expanded to form the small-diameter tube portion 10 and the large-diameter tube portion 11 and a taper is formed between the small-diameter tube portion 10 and the large-diameter tube portion 11. The part 12 is formed. The pipe contracting method is performed by, for example, spinning or drawing with a die, and the pipe expanding is performed by, for example, expanding with a punch.
【００２０】次で、図８に示すように上記大径管部１１
の一端９ａを上記第１実施例と同様のカール用ダイス２
の型穴３に位置させて小径管部１０の他端９ｂに荷重Ｐ
5 を軸方向に加え、上記第１実施例と同様に、大径管部
１１の他端部にカール加工による外向きのカール部４を
成形する。なお、この荷重Ｐ5 は、図８の鎖線で示すよ
うにテーパ部１２に加圧体１３を嵌合してこの加圧体１
３を介して加えるようにすると、管の座屈や曲り変形の
おそれがない。Next, as shown in FIG.
Of the curl die 2 as in the first embodiment.
And the load P on the other end 9b of the small-diameter tube portion 10
5 is added in the axial direction, and an outward curl portion 4 is formed at the other end of the large-diameter tube portion 11 by curling in the same manner as in the first embodiment. The load P 5 is applied to the pressurizing body 13 by fitting the pressurizing body 13 to the tapered portion 12 as shown by a chain line in FIG.
If it is added via 3, there is no risk of buckling or bending deformation of the tube.
【００２１】次で、上記の管のカール部４を図９に示す
ように、上記第１実施例と同様な折り返し加工用ダイス
５に位置させ、小径管部１０の他端９ｂに荷重Ｐ6 を管
軸方向に加える。Next, as shown in FIG. 9, the curled portion 4 of the tube is positioned on the folding die 5 similar to that of the first embodiment, and a load P 6 is applied to the other end 9b of the small-diameter tube portion 10. Is added in the tube axis direction.
【００２２】この荷重Ｐ6 により、上記第１実施例と同
様に、カール部４がダイス穴５ａの周端縁に引っ掛かっ
て管軸方向の移動が阻止されつつカール部４より続く大
径管部１１が図１０に示すようにダイス穴５ａの内面に
沿って折り返すように反転し、折り返し加工が行われ、
塑性変形した折曲反転部１４が形成される。このとき、
上記第１実施例と同様に、カール部４は剛性が高いこと
によりダイス穴５ａ内に滑り込まない。Due to the load P 6 , similarly to the first embodiment, the curl portion 4 is caught on the peripheral edge of the die hole 5 a, and is prevented from moving in the tube axis direction, while continuing from the curl portion 4. 11 is turned back along the inner surface of the die hole 5a as shown in FIG.
A bent inversion portion 14 that is plastically deformed is formed. At this time,
As in the first embodiment, the curl portion 4 does not slip into the die hole 5a due to its high rigidity.
【００２３】そして、大径管部１１とテーパ部１２との
境界部１１ａまで折曲反転させることにより、図１０に
示すように、小径管部１０の先部に先開状のテーパ部１
２を有し、かつ、そのテーパ部１２の先端から外側へ折
曲反転した大径管部１４を有する二重管であって大径管
部１４の折曲反転先端にカール部４を有する折曲反転管
が製造される。Then, as shown in FIG. 10, the front end of the small-diameter pipe 10 is bent forward and inverted to the boundary 11a between the large-diameter pipe 11 and the tapered section 12, so that the tapered section 1 is opened.
2 having a large-diameter tube portion 14 that is bent outward from the tip of the tapered portion 12 and has a curl portion 4 at the bending-reversal tip of the large-diameter tube portion 14. A bent tube is manufactured.
【００２４】また、必要に応じて、図１０に示す折り返
し加工後、図１１に示すようにカール部４を、押型７に
より荷重Ｐ7 を加えて偏平にし、表裏片が密着したフラ
ンジ１５に形成してもよい。Further, if necessary forming, after folding processing shown in FIG. 10, the curled portion 4 as shown in FIG. 11, in the flat by applying a load P 7 by pressing die 7, a flange 15 which front and back pieces are in close contact May be.
【００２５】本第２実施例によれば、上記第１実施例と
同様の折曲反転管が得られる上にテーパ部１２を有し、
かつこれによって小径管部１０と大径管部１１との間の
空隙寸法を大きくした折曲反転管を容易に製造できる。According to the second embodiment, a bent inversion tube similar to that of the first embodiment can be obtained, and the tapered portion 12 is provided.
In addition, this makes it possible to easily manufacture a bent inversion tube having a large gap between the small-diameter tube portion 10 and the large-diameter tube portion 11.
【００２６】図１２は第３実施例を示す。本実施例は、
上記第２実施例における図１０の折り返し加工後、更に
荷重Ｐ6を加えて、図１２に示すように、小径管部１０
とテーパ部１２との境界部１０ａを最下降させてテーパ
部１２も折り返し反転し、小径管部１０の先部に後開状
のテーパ部１２を有し、かつそのテーパ部１２の後端に
折曲反転した大径管部１４を有する二重管であって大径
管部１４の折曲反転先端にカール部４を有する折曲反転
管を製造するようにしたものである。FIG. 12 shows a third embodiment. In this embodiment,
After the folding process of FIG. 10 in the second embodiment, a load P 6 is further applied to the small-diameter tube portion 10 as shown in FIG.
The tapered portion 12 is also turned upside down by lowering the boundary portion 10 a between the tapered portion 12 and the tapered portion 12, and has a rearwardly opened tapered portion 12 at the front end of the small diameter pipe portion 10, and at the rear end of the tapered portion 12. This is a double pipe having a bent large-diameter pipe section 14 having a curled portion 4 at the bending-reversing tip of the large-diameter pipe section 14.
【００２７】また、必要に応じて、図１２に示す折り返
し加工後、図１３に示すようにカール部４を、押型７に
より荷重Ｐ8 を加えて偏平にし、表裏片が密着したフラ
ンジ１６に形成してもよい。Further, if necessary forming, after folding processing shown in FIG. 12, the curled portion 4 as shown in FIG. 13, the flat by applying a load P 8 by pressing die 7, the flange 16 of the front and back pieces are in close contact May be.
【００２８】本第３実施例においても上記第２実施例と
同様に、小径管部１０と大径管部１１との間の空隙寸法
を大きくした折曲反転管を容易に製造できる。なお、上
記各実施例における折り返し加工時において、管の一端
側に荷重を加えるようにしたが、管の一端を固定し、折
り返し加工用ダイス５を管軸方向へ押圧移動させて折り
返し加工を行ってもよい。In the third embodiment, similarly to the second embodiment, it is possible to easily manufacture a bent inversion tube having a large gap between the small-diameter tube portion 10 and the large-diameter tube portion 11. In the above-mentioned embodiments, a load is applied to one end of the tube during the turning process. However, one end of the tube is fixed, and the turning process is performed by pressing and moving the turning die 5 in the tube axis direction. You may.
【００２９】更に、上記第２及び第３実施例において、
カール４を形成した後に縮管又は拡管工程を行うように
してもよい。Further, in the second and third embodiments,
After the curl 4 is formed, the contraction or expansion step may be performed.
【００３０】[0030]
【発明の効果】以上のようであるから請求項１記載の発
明によれば、カール部を押圧するのみで、前記従来の如
く挟持する必要がなく折曲反転部を形成でき、かつカー
ル部も周知の簡単な一工程によるカール成形技術で形成
できるので、前記従来の技術に比べ、成形型及び成形設
備を簡易化して型費及び設備費を大幅に低減でき、かつ
工数と加工時間を低減して、能率化、製品コストの低減
化を図ることができる。As described above, according to the first aspect of the present invention, it is possible to form the bent reversal portion by simply pressing the curl portion, without the need for pinching as in the related art, and the curl portion can be formed. Since it can be formed by a well-known simple one-step curl molding technique, it is possible to greatly reduce the mold cost and equipment cost by simplifying the mold and molding equipment, and to reduce the number of steps and processing time, as compared with the conventional technique. Thus, efficiency and product cost can be reduced.
【００３１】請求項２記載の発明によれば、更に、小径
管部と折曲反転された大径管部とがテーパ部で連結さ
れ、かつ、小径管部と大径管部との間の空隙が大きい折
曲反転管を容易に製造できる。According to the second aspect of the present invention, the small-diameter tube portion and the bent large-diameter tube portion are connected by a tapered portion, and the small-diameter tube portion and the large-diameter tube portion are connected to each other. A bent inversion tube having a large gap can be easily manufactured.
【００３２】そして、請求項３記載の発明によれば、更
に、折り返し加工が、単にダイス穴を形成した折り返し
加工用ダイスで行え、簡易なダイスで容易かつ安価に製
造できる。According to the third aspect of the present invention, the folding process can be performed with a folding die having a die hole, and the die can be manufactured easily and inexpensively with a simple die.
【図１】本発明の第１実施例におけるカール部成形前の
状態を示す側断面図。FIG. 1 is a side sectional view showing a state before a curled portion is formed in a first embodiment of the present invention.
【図２】図１の状態からカール部を成形する工程を示す
側断面図。FIG. 2 is a side sectional view showing a step of forming a curled portion from the state of FIG.
【図３】図２によりカール成形された管を折り返し加工
用ダイスにセットした状態を示す側断面図。FIG. 3 is a side sectional view showing a state in which the curled tube shown in FIG. 2 is set in a folding die.
【図４】図３の状態から折曲反転加工を行った状態を示
す側断面図。FIG. 4 is a side cross-sectional view showing a state in which bending inversion processing has been performed from the state of FIG.
【図５】図４で加工された管におけるカール部を偏平に
押圧加工した状態を示す側断面図。FIG. 5 is a side sectional view showing a state where the curled portion of the tube processed in FIG. 4 is pressed flat.
【図６】本発明の第２実施例における素管状態を示す側
断面図。FIG. 6 is a side sectional view showing a state of a raw tube in a second embodiment of the present invention.
【図７】図６の素管の一部を縮管した状態の側断面図。FIG. 7 is a side sectional view showing a state in which a part of the raw tube in FIG. 6 is contracted.
【図８】図７の管にカール部を成形する工程を示す側断
面図。FIG. 8 is a side sectional view showing a step of forming a curled portion on the tube of FIG. 7;
【図９】図８によりカール成形された管を折り返し加工
用ダイスにセットした状態を示す側断面図。FIG. 9 is a side sectional view showing a state in which the tube curled according to FIG. 8 is set in a folding die.
【図１０】図９の状態から折曲反転加工を行った状態を
示す側断面図。FIG. 10 is a side sectional view showing a state in which the bending inversion processing is performed from the state in FIG.
【図１１】図１０で加工された管におけるカール部を偏
平に押圧加工した状態を示す側断面図。FIG. 11 is a side sectional view showing a state where a curled portion of the tube processed in FIG. 10 is pressed flat.
【図１２】本発明の第３実施例における折曲反転加工を
示す側断面図。FIG. 12 is a side cross-sectional view showing bending reversal processing in a third embodiment of the present invention.
【図１３】図１２で加工された管におけるカール部を偏
平に押圧加工した状態を示す側断面図。FIG. 13 is a side sectional view showing a state where the curled portion of the tube processed in FIG. 12 is pressed flat.
【図１４】従来の製造方法を示すもので、フレア部を挟
持した状態の側断面図。FIG. 14 is a cross-sectional side view showing a conventional manufacturing method, in which a flare portion is sandwiched.
【図１５】図１４の状態から管を押圧して折曲反転部を
成形した状態を示す側断面図。FIG. 15 is a side cross-sectional view showing a state where the tube is pressed from the state of FIG. 14 to form a bent inversion portion.
１，９…管 ４…カール部 ５…折り返し加工用ダイス ５ａ…ダイス穴 ６，１４…折曲反転部 １０…小径管部 １１…大径管部 １２…テーパ部 Ｒ1 …ダイス穴径 Ｒ2 …カール部の
外径 Ｒ3 …管の外径1,9 ... tube 4 ... curl portion 5 ... folding processing die 5a ... die holes 6,14 ... bent inverting unit 10 ... small diameter tube portion 11 ... large-diameter pipe portion 12 ... tapered portion R 1 ... die hole diameter R 2 … Outer diameter of the curled part R 3 … outer diameter of the pipe
Claims (3)
後にカール部を管軸方向の管部側へ押圧移動させて折曲
反転部を形成することを特徴とする折曲反転管の製造方
法。1. A bent inversion tube, wherein an outward curl portion is formed at a tube end, and thereafter, the curl portion is pressed and moved toward the tube portion in the axial direction of the tube to form a bent inversion portion. Manufacturing method.
続して形成する工程と、大径管部の管端に外向きのカー
ル部を形成する工程と、これらの工程後に、カール部を
管軸方向の管部側へ押圧移動させて折曲反転部を形成工
程とからなることを特徴とする折曲反転管の製造方法。2. A step of continuously forming a large-diameter pipe section, a tapered section, and a small-diameter pipe section in a pipe, a step of forming an outwardly curled section at a pipe end of the large-diameter pipe section, and after these steps. Forming a bent inversion portion by pressing and moving the curl portion toward the tube portion in the tube axis direction.
る工程を、カール部の外径より小径でかつ管の外径より
大径のダイス穴を有する折り返し加工用ダイスを用い、
カール部を上記ダイス穴の周端縁に位置させて管部又は
折り返し加工用ダイスを管軸方向へ押圧して行うように
した請求項１又は２記載の折曲反転管の製造方法。3. The step of moving the curl portion to the tube portion side in the tube axis direction is performed by using a folding die having a die hole having a smaller diameter than the outer diameter of the curl portion and a larger diameter than the outer diameter of the tube,
3. The method according to claim 1, wherein the curl portion is positioned at a peripheral edge of the die hole, and the tube portion or the folding die is pressed in the tube axis direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9253117A JPH1190528A (en) | 1997-09-18 | 1997-09-18 | Manufacture of bent and turned tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9253117A JPH1190528A (en) | 1997-09-18 | 1997-09-18 | Manufacture of bent and turned tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1190528A true JPH1190528A (en) | 1999-04-06 |
Family
ID=17246745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9253117A Withdrawn JPH1190528A (en) | 1997-09-18 | 1997-09-18 | Manufacture of bent and turned tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1190528A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002336914A (en) * | 2001-05-15 | 2002-11-26 | Abo Packing Seisakusho:Kk | Method for forming tubular body retaining part to deep drawing member |
| JP2008240984A (en) * | 2007-03-28 | 2008-10-09 | Noritz Corp | Pipe connection structure, pipe joint used for it, and manufacturing method thereof |
| JP2021529581A (en) * | 2018-07-04 | 2021-11-04 | チンタオ ハイアール ウォッシング マシーン カンパニー リミテッド | Drain valve body, drain valve and installation method |
-
1997
- 1997-09-18 JP JP9253117A patent/JPH1190528A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002336914A (en) * | 2001-05-15 | 2002-11-26 | Abo Packing Seisakusho:Kk | Method for forming tubular body retaining part to deep drawing member |
| JP2008240984A (en) * | 2007-03-28 | 2008-10-09 | Noritz Corp | Pipe connection structure, pipe joint used for it, and manufacturing method thereof |
| JP2021529581A (en) * | 2018-07-04 | 2021-11-04 | チンタオ ハイアール ウォッシング マシーン カンパニー リミテッド | Drain valve body, drain valve and installation 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: 20041207 |