JP2007090375A - Device for expanding tube end of metallic tube - Google Patents

Device for expanding tube end of metallic tube Download PDF

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JP2007090375A
JP2007090375A JP2005281169A JP2005281169A JP2007090375A JP 2007090375 A JP2007090375 A JP 2007090375A JP 2005281169 A JP2005281169 A JP 2005281169A JP 2005281169 A JP2005281169 A JP 2005281169A JP 2007090375 A JP2007090375 A JP 2007090375A
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tube
axial
expanding
diameter hole
pipe
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Yasuji Hatano
八州治 波多野
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Marelli Corp
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Calsonic Kansei Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for expanding the tube end of a metallic tube by which an expanded part can be secured in a predetermined size even when the wall thickness of the metallic tube is thin. <P>SOLUTION: This device is provided with a clamp 1 and a expanding means 2. The expanding means 2 is provided with a forming punch 21 at the nose of which a taper-shaped expanding tapered part 21a is provided and an approximately columnar core bar 22 which can be inserted in the state where the core bar is loosely brought into contact with the inner peripheral surface of the metallic tube 3 in a portion where is held with the clamp 1. The core bar 22 is fixed to the nose side of a shaft member 23 and the base end part of the shaft member 23 is inserted freely slidably into an axial-direction small-diameter hole 21b which is formed in the nose face of a forming punch 21 and an axial-direction large-diameter hole 21c having a diameter larger than that of the axial-direction small-diameter hole 21b is formed on the bottom side of the axial direction small-diameter hole 21b. In the base end part of the shaft member 23, an enlarged part 23a where can be locked to a stepped part having different diameters which is present in the axial-direction large-diameter hole 21c and formed between the axial-direction large-diameter hole 21b and the axial-direction small-diameter hole 21b and a coil spring 24 is housed in the compressed state between the enlarged part 23a and the bottom part of the axial-direction large-diameter hole 21c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、金属管の端部を拡管する金属管管端の拡管装置に関する。   The present invention relates to a tube expanding device at a metal tube end that expands an end of a metal tube.

従来、金属管の端部を拡管する方法の一つとして、図８に示すように、先端に先細り状の拡管用テーパ部１０１ａを備えたフォーミングパンチ１０１を用い、外周側からクランプ１０２で挟持して固定した金属管１０３の管端からフォーミングパンチ１０１を圧入させることにより、金属管１０３の端部を拡管させるようにした技術が知られている（例えば、特許文献１参照。）。
特開２００２−３４６６６４号公報 Conventionally, as one of the methods for expanding the end of a metal tube, as shown in FIG. 8, a forming punch 101 having a tapered tube-expansion taper 101a at the tip is used and clamped by a clamp 102 from the outer peripheral side. A technique is known in which a forming punch 101 is press-fitted from a pipe end of a metal pipe 103 fixed in such a manner that the end of the metal pipe 103 is expanded (see, for example, Patent Document 1).
JP 2002-346664 A

しかしながら、従来例の金属管管端の拡管装置にあっては、金属管１０３の肉厚が所定以上に厚い場合は問題ないが、肉厚が、例えば０．８ｍｍ以下と薄い場合は、フォーミングパンチ１０１の圧入時に、金属管１０３を縮径させる方向に座屈が発生してクランプ１０２による挟持力が低下し、フォーミングパンチ１０１の圧入に対抗できなくなるため、図９に示すように、クランプ１０２に対し金属管１０３が軸方向に滑って移動し、これにより、拡管部の所定寸法を確保することができなくなるおそれがあるという問題点があった。   However, in the conventional pipe expanding device at the end of the metal pipe, there is no problem if the thickness of the metal pipe 103 is larger than a predetermined thickness, but when the thickness is as thin as 0.8 mm or less, for example, the forming punch When the 101 is press-fitted, buckling occurs in the direction of reducing the diameter of the metal tube 103 and the clamping force by the clamp 102 is reduced, so that it becomes impossible to counter the press-fitting of the forming punch 101. Therefore, as shown in FIG. On the other hand, there has been a problem that the metal tube 103 may slide in the axial direction, which may make it impossible to secure a predetermined dimension of the expanded portion.

本発明の解決しようとする課題は、金属管の肉厚が薄い場合でも拡管部の所定寸法を確保することができる金属管管端の拡管装置を提供することにある。   The problem to be solved by the present invention is to provide a pipe expansion device at the end of a metal pipe that can secure a predetermined dimension of the pipe expansion portion even when the thickness of the metal pipe is thin.

上記課題を解決するため請求項１記載の金属管管端の拡管装置は、金属管の管端部付近を外周から挟持する状態で保持固定する挟持固定手段と、前記金属管の管端部から内部に圧入することにより管端部を拡管する拡管手段とが備えられ、前記拡管手段は、先端に先細り状の拡管用テーパ部を備えたフォーミングパンチと、前記挟持固定手段が挟持する部分の金属管の内周面に緩やかに接触する状態で差し込み可能な内面支持部材とが備えられ、該内面支持部材は軸部材の先端側に固定されると共に、該軸部材の基端側は前記フォーミングパンチの先端面に形成された軸方向穴内に摺動自在に挿入され、該軸方向穴内には軸部材を外方に常時付勢する付勢手段が収容されていることを特徴とする手段とした。   In order to solve the above-mentioned problems, a metal pipe tube end pipe expanding device according to claim 1 includes a clamping and fixing means for holding and fixing the vicinity of the pipe end of the metal pipe from the outer periphery, and a pipe end of the metal pipe. And a pipe expanding means for expanding the pipe end by press-fitting inside the pipe. The pipe expanding means includes a forming punch having a taper for expanding the pipe at the tip, and a metal in a portion sandwiched by the clamping and fixing means. An inner surface support member that can be inserted in a state of gently contacting the inner peripheral surface of the tube, the inner surface support member is fixed to the distal end side of the shaft member, and the proximal end side of the shaft member is the forming punch The urging means is slidably inserted into the axial hole formed in the tip surface of the rim, and the urging means for constantly urging the shaft member outward is accommodated in the axial hole. .

本発明の金属管管端の拡管装置では、上述のように構成されるため、まず、内面支持部材を金属管の管端部から差し込んで行き、フォーミングパンチにおける拡管用テーパ部が金属管の管端開口縁部に当接した時点で、内面支持部材が差し込まれた位置の金属管をその外周から挟持する状態で挟持固定手段を装着することにより、金属管が内面支持部材と挟持固定手段との間に挟持され、軸方向移動が阻止された状態となる。そこで、フォーミングパンチを金属管内に向けて軸方向に押圧すると、フォーミングパンチが付勢手段の付勢力に抗して金属管内に圧入され、金属管の管端部を拡管させることができる。その後、フォーミングパンチの押圧力を解除すると、付勢手段の付勢力がフォーミングパンチを拡管された金属管の管端部から押し出す方向に作用するため、楽に引き抜くことができる。そして、挟持固定手段による挟持状態を解除することにより、金属管内から内面支持部材を引き抜くことができる。   In the metal pipe tube end tube expansion apparatus of the present invention, since it is configured as described above, first, the inner surface support member is inserted from the tube end portion of the metal tube, and the taper portion for tube expansion in the forming punch is the tube of the metal tube. When the metal tube at the position where the inner surface support member is inserted is clamped from the outer periphery at the time of contact with the edge of the end opening, the metal tube is attached to the inner surface support member and the sandwich fixing device. And the axial movement is prevented. Therefore, when the forming punch is pressed in the axial direction toward the inside of the metal tube, the forming punch is pressed into the metal tube against the urging force of the urging means, and the end portion of the metal tube can be expanded. Thereafter, when the pressing force of the forming punch is released, the urging force of the urging means acts in the direction of pushing out the forming punch from the tube end portion of the expanded metal tube, so that it can be pulled out easily. And the inner surface supporting member can be pulled out from the inside of the metal tube by releasing the clamping state by the clamping and fixing means.

以上のように、内面支持部材によって金属管の軸方向移動を阻止することができるため、金属管の肉厚が薄い場合でも拡管部の所定寸法を確保することができようになるという効果が得られる。   As described above, since the axial movement of the metal tube can be prevented by the inner surface support member, the effect that the predetermined dimension of the expanded portion can be secured even when the metal tube is thin is obtained. It is done.

また、フォーミングパンチに対し内面支持部材が軸方向移動可能に連結されているため、金属管に対する差し込み及び引き抜き作業を両者一体に行うことができ、これにより、作業性を高めることができるようになる。   Further, since the inner surface supporting member is connected to the forming punch so as to be movable in the axial direction, it is possible to integrally perform insertion and extraction operations with respect to the metal pipe, thereby improving workability. .

また、付勢手段により、フォーミングパンチの操作のみで内面支持部材を金属管の所定の位置まで確実に差し込むことができると共に、フォーミングパンチの引き抜き作業を楽に行うことができるようになる。   Further, the urging means can surely insert the inner surface support member to a predetermined position of the metal tube only by the operation of the forming punch, and the forming punch can be pulled out easily.

以下にこの発明の実施例を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

この実施例１の金属管管端の拡管装置は、請求項１および２に記載の発明に対応する。   The pipe expanding device at the end of the metal pipe of the first embodiment corresponds to the invention described in claims 1 and 2.

まず、この実施例１の金属管管端の拡管装置を図面に基づいて説明する。   First, a pipe expanding apparatus at the end of a metal pipe according to the first embodiment will be described with reference to the drawings.

図１はこの実施例１の金属管管端の拡管装置における拡管手段を示す側面図、図２〜図５は実施例１の金属管管端の拡管装置及び該拡管装置による金属管の拡径工程図、図６は図３のＡ矢視図である。   FIG. 1 is a side view showing a pipe expanding means in a pipe expanding apparatus at the end of a metal pipe according to the first embodiment, and FIGS. 2 to 5 show a pipe expanding apparatus at the end of the metal pipe according to the first embodiment and a diameter expansion of the metal pipe by the pipe expanding apparatus. Process drawing and FIG. 6 are A arrow line views of FIG.

この金属管管端の拡管装置は、クランプ（挟持固定手段）１と、拡管手段２とを備えている。   The pipe expanding device at the end of the metal pipe includes a clamp (clamping / fixing means) 1 and a pipe expanding means 2.

さらに詳述すると、上記クランプ１は、金属管３の管端部付近を外周から挟持する状態で保持固定する挟持固定手段を構成するもので、この実施例１では、図６に示すように上下２分割に形成され、両分割片１１、１２の対向面に金属管３の外周面に沿った半円状の挟持溝１１ａ、１２ａがそれぞれ形成されている。   More specifically, the clamp 1 constitutes clamping and fixing means for holding and fixing the vicinity of the tube end portion of the metal tube 3 from the outer periphery. In the first embodiment, as shown in FIG. Semi-circular clamping grooves 11a and 12a are formed on the opposing surfaces of the two divided pieces 11 and 12 along the outer peripheral surface of the metal tube 3, respectively.

上記拡管手段２は、図１に示すように、先端に先細り状の拡管用テーパ部２１ａを備えたフォーミングパンチ２１と、クランプ１が挟持する部分の金属管３の内周面に緩やかに接触する状態で差し込み可能な略円柱状の芯金（内面支持部材）２２と、軸部材２３と、コイルスプリング（付勢手段）２４とで構成されている。   As shown in FIG. 1, the tube expansion means 2 gently contacts the forming punch 21 having a tapered tube expansion taper portion 21a at the tip and the inner peripheral surface of the metal tube 3 sandwiched by the clamp 1. It is composed of a substantially cylindrical core metal (inner surface support member) 22 that can be inserted in a state, a shaft member 23, and a coil spring (biasing means) 24.

即ち、上記芯金２２は、軸部材２３の先端側に固定されると共に、該軸部材２３の基端側はフォーミングパンチ２１の先端面に形成された軸方向小径穴２１ｂ内に摺動自在に挿入され、該軸方向小径穴２１ｂの底部側には該軸方向小径穴２１ｂより大径の軸方向大径穴２１ｃが形成され、軸部材２３の基端部には軸方向大径穴２１ｃ内にあって該軸方向大径穴２１ｃと軸方向小径穴２１ｂとの間に形成される異径段部２１ｄに係止可能な拡大部２３ａが形成され、該拡大部２３ａと軸方向大径穴２１ｃの底部との間にコイルスプリング２４が圧縮状態で収容されることにより、拡大部２３ａを異径段部２１ｄに当接する方向に常時付勢するようになっている。   That is, the cored bar 22 is fixed to the distal end side of the shaft member 23, and the proximal end side of the shaft member 23 is slidable in an axial small diameter hole 21 b formed in the distal end surface of the forming punch 21. The axial large-diameter hole 21c larger in diameter than the axial small-diameter hole 21b is formed on the bottom side of the axial small-diameter hole 21b and the axial end of the shaft member 23 is formed in the axial large-diameter hole 21c. An enlarged portion 23a that can be locked to a different-diameter step portion 21d formed between the axial large diameter hole 21c and the axial small diameter hole 21b is formed, and the enlarged portion 23a and the axial large diameter hole are formed. Since the coil spring 24 is accommodated in a compressed state between the bottom of 21c, the enlarged portion 23a is always urged in a direction in contact with the different-diameter stepped portion 21d.

そして、図５に示すように、フォーミングパンチ２１の先端面が芯金２２の端面に当接することでフォーミングパンチ２１の軸方向移動が停止されるように構成されている。   As shown in FIG. 5, the axial movement of the forming punch 21 is stopped when the tip surface of the forming punch 21 abuts against the end surface of the cored bar 22.

次に、この実施例１の作用を説明する。
この実施例１の金属管管端の拡管装置では上述のように構成されるため、まず、図２に示すように、芯金２２を金属管３の管端部から差し込んで行き、フォーミングパンチ２１における拡管用テーパ部２１ａが金属管３の管端開口縁部に当接した時点で、図３に示すように、芯金２２が差し込まれた位置の金属管３をその外周から挟持する状態でクランプ１を装着することにより、金属管３が芯金２２とクランプ１との間に挟持され、軸方向移動が阻止された状態となる。 Next, the operation of the first embodiment will be described.
Since the metal pipe tube end tube expanding apparatus of the first embodiment is configured as described above, first, as shown in FIG. 2, the cored bar 22 is inserted from the tube end of the metal tube 3 to form the forming punch 21. As shown in FIG. 3, when the taper portion 21a for tube expansion contacts the tube end opening edge of the metal tube 3, the metal tube 3 at the position where the core metal 22 is inserted is sandwiched from the outer periphery. By mounting the clamp 1, the metal tube 3 is sandwiched between the cored bar 22 and the clamp 1, and the axial movement is prevented.

そこで、図４に示すように、フォーミングパンチ２１を金属管３内に向けて軸方向に押圧すると、フォーミングパンチ２１がコイルスプリング２４の付勢力に抗して金属管３内に圧入され、金属管３の管端部を拡管させることができる。   Therefore, as shown in FIG. 4, when the forming punch 21 is pressed in the axial direction toward the metal tube 3, the forming punch 21 is pressed into the metal tube 3 against the urging force of the coil spring 24, and the metal tube 3 pipe ends can be expanded.

そして、図５に示すように、フォーミングパンチ２１における拡管用テーパ部２１ａの先端面が芯金２２の端面に当接することにより、金属管３の管端部が所定長さ拡管された状態となる。   And as shown in FIG. 5, when the front end surface of the taper part 21a for pipe expansion in the forming punch 21 contacts the end surface of the cored bar 22, the pipe end part of the metal pipe 3 is expanded by a predetermined length. .

その後、フォーミングパンチ２１の押圧力を解除すると、コイルスプリング２４の付勢力がフォーミングパンチ２１を拡管された金属管３の管端部から押し出す方向に作用するため、フォーミングパンチを楽に引き抜くことができる。そして、クランプ１による挟持状態を解除することにより、金属管２内から芯金２２を引き抜くことができる。   Thereafter, when the pressing force of the forming punch 21 is released, the urging force of the coil spring 24 acts in the direction of pushing out the forming punch 21 from the tube end portion of the expanded metal tube 3, so that the forming punch can be pulled out easily. And the metal core 22 can be pulled out from the inside of the metal tube 2 by releasing the clamping state by the clamp 1.

次に、この実施例１の効果を説明する。
以上詳細に説明してきたように、この実施例１の金属管管端の拡管装置では、上述のように、クランプ１が挟持する部分の金属管３の内周面に緩やかに接触する状態で差し込み可能な略円柱状の芯金２２によって、金属管３の軸方向移動を阻止することができるため、金属管３の肉厚が薄い場合でも拡管部３１の所定寸法を確保することができようになるという効果が得られる。 Next, the effect of the first embodiment will be described.
As described above in detail, in the pipe expanding apparatus at the end of the metal pipe of the first embodiment, as described above, the plug is inserted in a state where it is gently in contact with the inner peripheral surface of the metal pipe 3 at the portion where the clamp 1 is sandwiched. Since the substantially cylindrical cored bar 22 can prevent the axial movement of the metal tube 3, the predetermined dimension of the expanded portion 31 can be secured even when the metal tube 3 is thin. The effect of becoming is obtained.

また、フォーミングパンチ２１に対し芯金２２が軸方向移動可能に連結されているため、金属管３に対する差し込み及び引き抜き作業を両者一体に行うことができ、これにより、作業性を高めることができるようになる。   Further, since the cored bar 22 is connected to the forming punch 21 so as to be movable in the axial direction, it is possible to perform insertion and extraction operations with respect to the metal tube 3 integrally, thereby improving workability. become.

また、コイルスプリング２４により、フォーミングパンチ２１の操作のみで芯金２２を金属管３の所定の位置まで確実に差し込むことができると共に、フォーミングパンチ２１の引き抜き作業を楽に行うことができるようになる。   Further, the core spring 22 can be reliably inserted to a predetermined position of the metal tube 3 by only the operation of the forming punch 21 by the coil spring 24, and the forming punch 21 can be pulled out easily.

次に、他の実施例について説明する。この他の実施例の説明にあたっては、前記実施例１と同様の構成部分については図示を省略し、もしくは同一の符号を付けてその説明を省略し、相違点についてのみ説明する。   Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

この実施例２は、実施例１における金属管管端の拡管装置の変形例を示すものであり、図７の断面図に示すように、金属管３の管端部付近に曲がり部３２が形成され、クランプ１は曲がり部３２を外周から挟持するように構成されると共に、芯金２２の一方の面が金属管３における曲がり部３２の外側の内周面３２ａに沿う状態に切欠されている点が、上記実施例１とは相違したものである。   The second embodiment shows a modification of the pipe expanding device at the end of the metal pipe in the first embodiment. As shown in the cross-sectional view of FIG. 7, a bent portion 32 is formed in the vicinity of the pipe end of the metal pipe 3. The clamp 1 is configured so as to sandwich the bent portion 32 from the outer periphery, and one surface of the cored bar 22 is notched in a state along the inner peripheral surface 32 a outside the bent portion 32 in the metal tube 3. This is different from the first embodiment.

従って、この実施例２では、実施例１と同様の効果が得られる他、管端部付近に曲がり部３２が形成された金属管３でも実施できるという追加の効果が得られる。   Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained, and the additional effect that the second embodiment can be implemented also in the metal tube 3 in which the bent portion 32 is formed in the vicinity of the tube end portion.

以上本実施例を説明してきたが、本発明は上述の実施例に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等があっても、本発明に含まれる。   Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.

例えば、実施例では、付勢手段としてコイルスプリング２４を用いる例を示したが、エアスプリング等他の付勢手段を用いることができる。   For example, in the embodiment, the example in which the coil spring 24 is used as the urging means has been described, but other urging means such as an air spring can be used.

また、実施例では、芯金２２として、金属管３の内周面全面に当接する円柱状に形成した例を示したが、周方向に一定間隔ごとに部分的に当接するものであってもよい。   Moreover, in the Example, although the example which formed in the column shape contact | abutted to the whole internal peripheral surface of the metal pipe 3 as the metal core 22 was shown, even if it contact | abuts partially for every fixed interval in the circumferential direction, Good.

実施例１の金属管管端の拡管装置における拡管手段を示す側面図である。It is a side view which shows the pipe expansion means in the pipe expansion apparatus of the metal pipe pipe end of Example 1. FIG. 実施例１の金属管管端の拡管装置及び該拡管装置による金属管の拡径工程図である。It is a diameter expansion process figure of the metal pipe by the pipe expansion apparatus of the metal pipe end of Example 1, and this pipe expansion apparatus. 実施例１の金属管管端の拡管装置及び該拡管装置による金属管の拡径工程図である。It is a diameter expansion process figure of the metal pipe by the pipe expansion apparatus of the metal pipe end of Example 1, and this pipe expansion apparatus. 実施例１の金属管管端の拡管装置及び該拡管装置による金属管の拡径工程図である。It is a diameter expansion process figure of the metal pipe by the pipe expansion apparatus of the metal pipe end of Example 1, and this pipe expansion apparatus. 実施例１の金属管管端の拡管装置及び該拡管装置による金属管の拡径工程図である。It is a diameter expansion process figure of the metal pipe by the pipe expansion apparatus of the metal pipe end of Example 1, and this pipe expansion apparatus. 図３のＡ矢視図である。It is A arrow directional view of FIG. 従来例の金属管管端の拡管装置を示す断面図である。It is sectional drawing which shows the pipe expansion apparatus of the metal pipe pipe end of a prior art example. 従来例の金属管管端の拡管装置を示す断面図である。It is sectional drawing which shows the pipe expansion apparatus of the metal pipe pipe end of a prior art example. 従来例の金属管管端の拡管装置を示す断面図である。It is sectional drawing which shows the pipe expansion apparatus of the metal pipe pipe end of a prior art example.

符号の説明Explanation of symbols

１ クランプ（挟持固定手段）
１１ 分割片
１１ａ 挟持溝
１２ 分割片
１２ａ 挟持溝
２ 拡管手段
２１ フォーミングパンチ
２１ａ 拡管用テーパ部
２１ｂ 軸方向小径穴
２１ｃ 軸方向大径穴
２１ｄ 異径段部
２２ 芯金（内面支持部材）
２３ 軸部材
２３ａ 拡大部
２４ コイルスプリング（付勢手段）
３ 金属管
３１ 拡管部
３２ 曲がり部
３２ａ 外側の内周面 1 Clamp (Clamping / fixing means)
DESCRIPTION OF SYMBOLS 11 Divided piece 11a Clamping groove 12 Divided piece 12a Clamping groove 2 Tube expansion means 21 Forming punch 21a Tapered portion for tube expansion 21b Axial small diameter hole 21c Axial large diameter hole 21d Different diameter step portion 22 Core metal (inner surface support member)
23 Shaft member 23a Enlarged portion 24 Coil spring (biasing means)
3 Metal tube 31 Expanded portion 32 Bent portion 32a Inner inner peripheral surface

Claims (4)

金属管の管端部付近を外周から挟持する状態で保持固定する挟持固定手段と、前記金属管の管端部から内部に圧入することにより管端部を拡管する拡管手段とが備えられ、
前記拡管手段は、先端に先細り状の拡管用テーパ部を備えたフォーミングパンチと、前記挟持固定手段が挟持する部分の金属管の内周面に緩やかに接触する状態で差し込み可能な内面支持部材とが備えられ、該内面支持部材は軸部材の先端側に固定されると共に、該軸部材の基端側は前記フォーミングパンチの先端面に形成された軸方向穴内に摺動自在に挿入され、該軸方向穴内には軸部材を外方に常時付勢する付勢手段が収容されていることを特徴とする金属管管端の拡管装置。 Sandwiching and fixing means for holding and fixing the vicinity of the tube end portion of the metal tube from the outer periphery, and a tube expanding means for expanding the tube end portion by press-fitting into the inside from the tube end portion of the metal tube,
The tube expanding means includes a forming punch having a tapered tube expanding taper at the tip, and an inner surface support member that can be inserted in a state where it is gently in contact with the inner peripheral surface of the metal tube sandwiched by the clamping and fixing means. The inner surface support member is fixed to the distal end side of the shaft member, and the proximal end side of the shaft member is slidably inserted into an axial hole formed in the distal end surface of the forming punch, An expanding device for a metal tube end, wherein an urging means for constantly urging the shaft member outward is accommodated in the axial hole. 金属管の管端部付近を外周から挟持する状態で保持固定する挟持固定手段と、前記金属管の管端部から内部に圧入することにより管端部を拡管する拡管手段とが備えられ、
前記拡管手段は、先端に先細り状の拡管用テーパ部を備えたフォーミングパンチと、前記挟持固定手段が挟持する部分の金属管の内周面に緩やかに接触する状態で差し込み可能な内面支持部材とが備えられ、該内面支持部材は軸部材の先端側に固定されると共に、該軸部材の基端側は前記フォーミングパンチの先端面に形成された軸方向小径穴内に摺動自在に挿入され、該軸方向小径穴の底部側には該軸方向小径穴より大径の軸方向大径穴が形成され、前記軸部材の基端部には前記軸方向大径穴内にあって該軸方向大径穴と前記軸方向小径穴との間に形成される異径段部に係止可能な拡大部が形成され、該拡大部と前記軸方向大径穴の底部との間に前記拡大部を前記異径段部に当接する方向に常時付勢する付勢手段が収容されていることを特徴とする金属管管端の拡管装置。 Sandwiching and fixing means for holding and fixing the vicinity of the tube end portion of the metal tube from the outer periphery, and a tube expanding means for expanding the tube end portion by press-fitting into the inside from the tube end portion of the metal tube,
The tube expanding means includes a forming punch having a tapered tube expanding taper at the tip, and an inner surface support member that can be inserted in a state where it is gently in contact with the inner peripheral surface of the metal tube sandwiched by the clamping and fixing means. The inner surface support member is fixed to the distal end side of the shaft member, and the proximal end side of the shaft member is slidably inserted into an axial small-diameter hole formed in the distal end surface of the forming punch, An axial large-diameter hole larger in diameter than the axial small-diameter hole is formed on the bottom side of the axial small-diameter hole, and the proximal end portion of the shaft member is located in the axial large-diameter hole and is large in the axial direction. An enlarged portion that can be locked to a step of different diameter formed between the diameter hole and the axially small diameter hole is formed, and the enlarged portion is disposed between the enlarged portion and the bottom of the axially large diameter hole. A biasing means for constantly biasing in the direction in contact with the step with the different diameter is housed. Expanding apparatus of the metal pipe tube end to. 請求項１または２に記載の金属管管端の拡管装置において、前記フォーミングパンチの先端面が前記内面支持部材の端面に当接することでフォーミングパンチの軸方向移動が停止されるように構成されていることを特徴とする金属管管端の拡管装置。   3. The metal pipe end expansion device according to claim 1 or 2, wherein the axial movement of the forming punch is stopped when the tip end surface of the forming punch comes into contact with the end surface of the inner surface support member. A pipe expanding device for a metal pipe end. 請求項１〜３のいずれか１項に記載の金属管管端の拡管装置において、前記金属管の管端部付近に曲がり部が形成され、前記挟持固定手段は前記曲がり部を外周から挟持するように構成され、前記内面支持部材の一方の面が前記金属管の曲がり部外側の内周面に沿う状態に切欠されていることを特徴とする金属管管端の拡管装置。   The metal pipe tube end pipe expanding device according to any one of claims 1 to 3, wherein a bent portion is formed in the vicinity of the pipe end portion of the metal tube, and the clamping and fixing means clamps the bent portion from the outer periphery. The pipe expanding device at the end of the metal pipe, wherein one surface of the inner surface support member is cut out in a state along the inner peripheral surface outside the bent portion of the metal pipe.
JP2005281169A 2005-09-28 2005-09-28 Device for expanding tube end of metallic tube Withdrawn JP2007090375A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101829736A (en) * 2010-04-16 2010-09-15 李镇南 Disposable flaring and necking mould of profiled tee joint
CN107812801A (en) * 2017-10-12 2018-03-20 台州市华丰空调阀门有限公司 The processing method of metal bellows
CN110576110A (en) * 2019-10-11 2019-12-17 含山县荣源金属制品有限公司 Straight pipe flaring machine
CN116037784A (en) * 2023-02-20 2023-05-02 无锡市新峰管业有限公司 Nuclear power small-bore pipe fitting flaring equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101829736A (en) * 2010-04-16 2010-09-15 李镇南 Disposable flaring and necking mould of profiled tee joint
CN107812801A (en) * 2017-10-12 2018-03-20 台州市华丰空调阀门有限公司 The processing method of metal bellows
CN107812801B (en) * 2017-10-12 2019-12-10 台州市华丰空调阀门有限公司 Method for processing metal corrugated pipe
CN110576110A (en) * 2019-10-11 2019-12-17 含山县荣源金属制品有限公司 Straight pipe flaring machine
CN116037784A (en) * 2023-02-20 2023-05-02 无锡市新峰管业有限公司 Nuclear power small-bore pipe fitting flaring equipment
CN116037784B (en) * 2023-02-20 2023-11-10 无锡市新峰管业有限公司 Nuclear power small-bore pipe fitting flaring equipment

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