JPH073833U - Expansion billet - Google Patents
Expansion billetInfo
- Publication number
- JPH073833U JPH073833U JP3329493U JP3329493U JPH073833U JP H073833 U JPH073833 U JP H073833U JP 3329493 U JP3329493 U JP 3329493U JP 3329493 U JP3329493 U JP 3329493U JP H073833 U JPH073833 U JP H073833U
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- Prior art keywords
- pipe
- billet
- expanding
- expansion
- mandrel
- 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.)
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Abstract
(57)【要約】
【目的】本考案は、拡管作業のスピードアップ、即ち生
産性の向上を図るべく拡管用マンドレルの管内への進入
速度を上げた場合でも、管の内周面を急激に拡管ビレッ
トの球面の拡管作用面の円弧面部に沿わせることなく、
スムーズにしかも摩擦抵抗をも最少にとどめて所定の拡
管を行うことが出来るために、拡管ビレットと管との焼
きつきを多量の潤滑油を必要とすることなく完全に防止
し、しかも前記管の材厚や拡管率、更に拡管ビレットが
進入する管の内径と該拡管ビレットの球面の最大径部等
との関係による管の変形や裂断も完全に防止して熱交換
器の生産性を向上させることが出来る極めて優れた拡管
ビレットを提供するものである。
【構成】所定の管11を拡管するための拡管用マンドレル
２のマンドレル本体2aの先端に取付けられる拡管ビレッ
ト１に於いて、該拡管ビレット本体1aのマンドレル本体
2a側の一端側が、球面の拡管作用面３を形成し、且つ他
端側が、先端にかけて先細状となるべく、該球面の最大
径部４より小さい径部５の球周面部６から接線状態で延
出された傾斜面７を形成した点にある。
(57) [Abstract] [Purpose] The present invention rapidly increases the inner peripheral surface of a pipe even when the pipe expanding mandrel enters the pipe at a high speed to speed up the pipe expanding operation, that is, to improve productivity. Without going along the arc surface of the tube expansion action surface of the spherical surface of the tube expansion billet,
Since it is possible to carry out the prescribed pipe expansion smoothly with minimal frictional resistance, seizure between the pipe expansion billet and the pipe can be completely prevented without the need for a large amount of lubricating oil, and the pipe Improves heat exchanger productivity by completely preventing deformation and tearing of the pipe due to material thickness, pipe expansion ratio, and the relationship between the pipe inner diameter into which the pipe expansion billet enters and the maximum diameter of the spherical surface of the pipe expansion billet. It is an object of the present invention to provide an extremely excellent expanded billet that can be produced. [Structure] In a pipe expanding billet 1 attached to the tip of a mandrel main body 2a of a pipe expanding mandrel 2 for expanding a predetermined pipe 11, the mandrel main body of the pipe expanding billet main body 1a
One end on the 2a side forms a spherical tube expanding surface 3 and the other end extends tangentially from the spherical peripheral surface portion 6 of the diameter portion 5 smaller than the maximum diameter portion 4 of the spherical surface so as to be tapered toward the tip. It is at the point where the projected inclined surface 7 is formed.
Description
【０００１】[0001]
本考案は、熱交換器の組み立てに際して、複数の放熱フィンに挿通された管を 拡管して該複数の放熱フィンと該管とを一体的に固着するための拡管用マンドレ ルに取付けられる拡管ビレットに関する。 The present invention relates to a pipe expanding billet attached to a pipe expanding mandrel for expanding a pipe inserted through a plurality of radiating fins and integrally fixing the plurality of radiating fins and the pipe when assembling a heat exchanger. Regarding
【０００２】[0002]
従来、この種拡管用マンドレルに取付けられる拡管ビレットは、第５図に示す 様に、拡管する管11の内径や拡管後の該管の内径に適合すべく所定の最大径部12 を有する球面の拡管作用面13と、該拡管ビレット14を取付けボルト15等を介して 拡管用マンドレル16に取付けるための貫通孔17が形成された構造を有してなるも のである。 Conventionally, a pipe-expanding billet attached to this type of pipe-expanding mandrel has a spherical surface having a predetermined maximum diameter portion 12 so as to match the inside diameter of the pipe 11 to be expanded and the inside diameter of the pipe after expansion, as shown in FIG. The pipe expanding action surface 13 and the through hole 17 for attaching the pipe expanding billet 14 to the pipe expanding mandrel 16 via the mounting bolts 15 and the like are formed.
【０００３】[0003]
然しながら、前記従来の様に、拡管作用面が球面である拡管ビレットに於いて は、下記の様な問題点があった。 However, the tube-expanding billet having a spherical tube-expanding surface as in the conventional case has the following problems.
【０００４】 即ち、上記の如く拡管作用面13が球面である拡管ビレット14を用いて拡管を行 う場合、必ず管11の内周面11a は該拡管ビレット14の球面の拡管作用面13を介し て拡管されることになる。That is, when performing tube expansion using the tube expansion billet 14 whose tube expansion surface 13 is a spherical surface as described above, the inner peripheral surface 11 a of the tube 11 must always pass through the spherical tube expansion operation surface 13 of the tube expansion billet 14. Will be expanded.
【０００５】 よって、球面の拡管作用面13を有する拡管ビレット14を具備した拡管用マンド レル16の管11内への進入速度が比較的遅い場合には拡管作業に何ら不都合が生じ るものではないが、最近の顧客の要望の大半は、拡管作業のスピードアップ、即 ち生産性の向上が容易に図れることが最大の要望であり必須の条件である。[0007] Therefore, no problem occurs in the pipe expanding work when the pipe expanding mandrel 16 including the pipe expanding billet 14 having the spherical pipe expanding surface 13 enters the pipe 11 at a relatively slow speed. However, most of the recent requests from customers are the most important and indispensable condition that the expansion work can be speeded up and the productivity can be improved easily.
【０００６】 従って、上記顧客の要望に答えるべく拡管用マンドレル16の管11内への進入速 度をただ単純に上げた場合には、前記管11の内周面11a は、拡管ビレット14の球 面の拡管作用面13の円弧面部13a に沿って急激に拡管されることになり、しいて は該拡管ビレット14と管11とが摩擦抵抗によって焼きつく原因にもなることから 、焼きつき防止のために非常に多量の潤滑油が必要であるばかりか、前記管11の 材厚や拡管率、更に拡管ビレット14が進入する管11の内径と該拡管ビレット14の 球面の最大径部12等との関係によっては管11が変形したり、又管11内空気の急激 な圧縮によって該管11が容易に裂断してしまうこともあり、結果として熱交換器 の生産性を逆に低下させてしまうという重大な問題が生じていた。[0006] Therefore, in order to meet the customer's request, if the speed at which the pipe expanding mandrel 16 enters the pipe 11 is simply increased, the inner peripheral surface 11a of the pipe 11 has a ball of the pipe expanding billet 14. Since the tube is rapidly expanded along the arc surface 13a of the tube expansion action surface 13, the tube expansion billet 14 and the tube 11 may be burned due to frictional resistance. Therefore, not only a very large amount of lubricating oil is required, but also the material thickness and expansion ratio of the pipe 11, the inner diameter of the pipe 11 into which the expansion billet 14 enters, the maximum diameter part 12 of the spherical surface of the expansion billet 14, etc. Depending on the relationship, the pipe 11 may be deformed, or the air inside the pipe 11 may be abruptly compressed, causing the pipe 11 to be easily torn, resulting in a consequent decrease in the productivity of the heat exchanger. There was a serious problem of being lost.
【０００７】 然して、本考案は上記種々の問題を全て解決するものであり、拡管作業のスピ ードアップ、即ち生産性の向上を図るべく拡管用マンドレルの管内への進入速度 を上げた場合でも、前記管の内周面を急激に拡管ビレットの球面の拡管作用面の 円弧面部に沿わせることなく、スムーズにしかも摩擦抵抗をも最少にとどめて所 定の拡管を行うことが出来るために、拡管ビレットと管との焼きつきを多量の潤 滑油を必要とすることなく完全に防止し、しかも前記管の材厚や拡管率、更に拡 管ビレットが進入する管の内径と該拡管ビレットの球面の最大径部等との関係に よる管の変形や裂断も完全に防止して熱交換器の生産性を向上させることが出来 る極めて優れた拡管ビレットを提供することを課題とするものである。However, the present invention solves all of the various problems described above. Even when the mandrel for expanding the pipe is advanced to the inside thereof to speed up the pipe expanding operation, that is, to improve productivity, Since the inner peripheral surface of the pipe does not suddenly follow the arcuate surface of the spherical expansion surface of the expansion billet, smooth expansion of the billet can be performed with minimal frictional resistance. It is possible to completely prevent seizure between the pipe and the pipe without the need for a large amount of lubricating oil, and to further reduce the material thickness of the pipe, the pipe expansion ratio, the inner diameter of the pipe into which the expansion billet enters, and the spherical surface of the expansion billet. It is an object of the present invention to provide an extremely excellent expanded billet that can completely prevent deformation and tearing of the tube due to the relationship with the maximum diameter part and improve the productivity of the heat exchanger. .
【０００８】[0008]
本考案は上記の問題を解決するために、全く新しい拡管ビレットを考案し、以 下の手段を講じたものである。 In order to solve the above problems, the present invention has devised an entirely new expansion billet and has taken the following measures.
【０００９】 即ち、本考案は、所定の管11を拡管するための拡管用マンドレル２のマンドレ ル本体2aの先端に取付けられる拡管ビレット１に於いて、該拡管ビレット本体1a のマンドレル本体2a側の一端側が、球面の拡管作用面３を形成し、且つ他端側が 、先端にかけて先細状となるべく、該球面の最大径部４より小さい径部５の球周 面部６から接線状態で延出された傾斜面７を形成した点にある。That is, according to the present invention, in the pipe expanding billet 1 attached to the tip of the mandrel main body 2a of the pipe expanding mandrel 2 for expanding the predetermined pipe 11, the pipe expanding billet main body 1a is provided on the side of the mandrel main body 2a. One end side forms a spherical tube expanding surface 3 and the other end side is tangentially extended from the spherical peripheral surface portion 6 of the diameter portion 5 smaller than the maximum diameter portion 4 of the spherical surface so as to be tapered toward the tip. It is at the point where the inclined surface 7 is formed.
【００１０】 更に、前記拡管ビレット本体1aには、該拡管ビレット本体1aの一端側から他端 側にかけて第１の貫通孔９が形成され、且つ該拡管ビレット本体1aのマンドレル 本体2a側の周面部には、該拡管ビレット本体1aの軸長方向と交差すると共に、前 記第１の貫通孔９に連通する第２の貫通孔又は切り欠き溝10が形成された点にあ る。Further, a first through hole 9 is formed in the pipe expanding billet body 1a from one end side to the other end side of the pipe expanding billet body 1a, and a peripheral surface portion of the pipe expanding billet body 1a on the mandrel body 2a side. At this point, there is formed a second through hole or notch groove 10 which intersects the axial length direction of the expanded billet body 1a and communicates with the first through hole 9 described above.
【００１１】[0011]
上記構成からなる拡管ビレット１に於いては、拡管ビレット本体1aのマンドレ ル本体2a側の一端側が、球面の拡管作用面３を形成し、且つ他端側が、先端にか けて先細状となるべく、該球面の最大径部４より小さい径部５の球周面部６から 接線状態で延出された傾斜面７を形成してなることから、拡管時に前記管11の内 周面11a を初めから拡管ビレット１の球面の拡管作用面３に沿わせることなく、 初めに傾斜面７を介して該管11を徐々に、且つスムーズに拡管させて摩擦抵抗を 最少にとどめることが出来る。 In the tube-expanding billet 1 having the above structure, one end of the tube-expanding billet main body 1a on the mandrel body 2a side forms a spherical tube-expanding action surface 3, and the other end side is tapered toward the tip. Since the inclined surface 7 is formed so as to be tangentially extended from the spherical peripheral surface portion 6 of the diameter portion 5 smaller than the maximum diameter portion 4 of the spherical surface, the inner peripheral surface 11a of the pipe 11 is expanded from the beginning when the pipe is expanded. The friction resistance can be minimized by first gradually and smoothly expanding the tube 11 via the inclined surface 7 without following the spherical tube expanding surface 3 of the tube expanding billet 1.
【００１２】 更に、前記拡管ビレット本体1aには、該拡管ビレット本体1aの一端側から他端 側にかけて第１の貫通孔９が形成され、且つ該拡管ビレット本体1aのマンドレル 本体2a側の周面部には、該拡管ビレット本体1aの軸長方向と交差すると共に、前 記第１の貫通孔９に連通する第２の貫通孔又は切り欠き溝10が形成されてなるこ とから、拡管用マンドレル２の管11内への進入速度を上げた場合であっても、該 拡管用マンドレル２の拡管ビレット１を介して前記管11内で急激に圧縮される空 気を瞬時に管11外へと排出することが出来る。Further, a first through hole 9 is formed in the pipe expanding billet body 1a from one end side to the other end side of the pipe expanding billet body 1a, and a peripheral surface portion of the pipe expanding billet body 1a on the mandrel body 2a side. The second mandrel for expanding a pipe is formed with a second through hole or a notch groove 10 which intersects the axial direction of the pipe expanding billet body 1a and communicates with the first through hole 9 described above. Even if the speed at which the No. 2 enters the tube 11 is increased, the air that is rapidly compressed in the tube 11 via the tube expanding billet 1 of the tube expanding mandrel 2 is instantaneously discharged to the outside of the tube 11. Can be discharged.
【００１３】[0013]
以下、本考案の一実施例を図面に従って説明する。 An embodiment of the present invention will be described below with reference to the drawings.
【００１４】 図１に於いて、１は拡管用マンドレル２のマンドレル本体2aの先端に取付けら れる拡管ビレットを示し、1aは拡管ビレット本体を示す。In FIG. 1, reference numeral 1 denotes a pipe expanding billet attached to the tip of the mandrel body 2a of the pipe expanding mandrel 2, and 1a denotes a pipe expanding billet body.
【００１５】 ３は上記拡管ビレット本体1aのマンドレル本体2a側の一端側に形成され、且つ 最大径部（直径）４に対応する所定の曲率の円弧面部3aによって形成された球面 の拡管作用面を示し、且つ他端側には、先端にかけて先細状となるべく、前記球 面の最大径部４より小さい径部５の球周面部６から接線状態で延出された傾斜面 ７を示す。Reference numeral 3 denotes a spherical tube expanding surface formed on one end of the tube expanding billet body 1a on the mandrel body 2a side and formed by an arc surface 3a having a predetermined curvature corresponding to the maximum diameter part (diameter) 4. Also, on the other end side, an inclined surface 7 is tangentially extended from the spherical peripheral surface portion 6 of the diameter portion 5 smaller than the maximum diameter portion 4 of the spherical surface so as to be tapered toward the tip.
【００１６】 尚、上記構成からなる拡管ビレット本体1aの前記傾斜面７と、前記拡管ビレッ ト本体1aの先端部1bに接すべく、該拡管ビレット本体1aの軸長方向の中芯線Ａと 直交する仮想線Ｂの交わりによって生じる角度Ｃは各種拡管時の圧入実験の結果 等から常に60°〜75°の範囲内で形成されてなる。In order to make contact with the inclined surface 7 of the pipe expanding billet body 1a and the tip portion 1b of the pipe expanding billet body 1a, it is orthogonal to the center line A in the axial direction of the pipe expanding billet body 1a. The angle C generated by the intersection of the virtual lines B is always formed within the range of 60 ° to 75 ° based on the results of the press-fitting experiments at the time of various tube expansions.
【００１７】 ９は上記拡管ビレット14を取付けボルト（図示せず）等の取付け手段を介して 前記拡管用マンドレル２に取付けるための貫通孔を示す。Reference numeral 9 denotes a through hole for attaching the pipe expanding billet 14 to the pipe expanding mandrel 2 via a mounting means such as a mounting bolt (not shown).
【００１８】 本実施例における拡管ビレットは以上の構成からなるが、次にかかる拡管ビレ ットを具備した拡管用マンドレル２を介して熱交換器の管を拡管する場合につい て説明する。The tube-expansion billet in this embodiment has the above-mentioned structure. Next, the case of expanding the tube of the heat exchanger through the tube-expansion mandrel 2 having the tube-expansion billet will be described.
【００１９】 先ず、図２に示す様に、上記構成からなる拡管ビレット１を拡管用マンドレル ２を介して熱交換器の管11内に圧入することによって該管11の内周面11a は、拡 管ビレット１を介して従来の拡管ビレット14を用いた場合と同様に外方向に押し 拡げられることになるが、該拡管ビレット本体1aのマンドレル本体2a側の一端側 には、球面の拡管作用面３が形成され、且つ他端側には、先端にかけて先細状と なるべく、該球面の最大径部４より小さい径部５の球周面部６から接線状態で延 出された傾斜面７が形成されてなる。First, as shown in FIG. 2, the inner peripheral surface 11a of the tube 11 is expanded by press-fitting the tube expanding billet 1 having the above-mentioned configuration into the tube 11 of the heat exchanger via the tube expanding mandrel 2. Although it can be pushed outward through the tube billet 1 in the same way as when the conventional tube expansion billet 14 is used, one side of the tube expansion billet body 1a on the mandrel body 2a side has a spherical tube expansion surface. 3 is formed, and on the other end side, an inclined surface 7 extending tangentially from the spherical peripheral surface portion 6 of the diameter portion 5 smaller than the maximum diameter portion 4 of the spherical surface is formed so as to be tapered toward the tip. It becomes.
【００２０】 従って、拡管時に前記管11の内周面11a を初めから拡管ビレット１の球面の拡 管作用面３に沿わせることなく、初めに円錐状の傾斜面７を介して該管11を徐々 に、且つスムーズに拡管させて摩擦抵抗を最少にとどめることで、前記拡管用マ ンドレル２の管11内への進入速度を向上させても該拡管ビレット１と管11との焼 きつきを多量の潤滑油を必要とすることなく完全に防止し、しかも前記管11の材 厚や拡管率、更に拡管ビレット１が進入する管11の内径と該拡管ビレット１の球 面の最大径部４等との関係による管11の裂断も完全に防止して熱交換器の生産性 を向上させることが出来るのである。Therefore, at the time of pipe expansion, the inner peripheral surface 11a of the pipe 11 is not initially aligned with the spherical pipe expansion action surface 3 of the pipe expansion billet 1, but the pipe 11 is first connected via the conical inclined surface 7. By gradually and smoothly expanding the tube to minimize the frictional resistance, even if the speed at which the tube expanding mandrel 2 enters the tube 11 is improved, the seizure between the tube expanding billet 1 and the tube 11 will be large. Completely prevent the need for the lubricating oil, and further, the thickness and expansion ratio of the pipe 11, the inner diameter of the pipe 11 into which the expansion billet 1 enters, the maximum diameter part 4 of the spherical surface of the expansion billet 1, etc. Therefore, it is possible to completely prevent the pipe 11 from being torn due to the relationship with, and improve the productivity of the heat exchanger.
【００２１】 尚、上記実施例に於いて、拡管ビレットには、取付けボルト（図示せず）等の 取付け手段を介して該拡管ビレットを拡管用マンドレルに取付けるための第１の 貫通孔が、該拡管ビレットの一端側から他端側にかけて挿通されてなるが、図３ に示す様に、該拡管ビレット本体のマンドレル本体側の周面部に、該拡管ビレッ ト本体の軸長方向と交差すると共に、前記第１の貫通孔に連通する第２の切り欠 き溝10が設けられてなる場合には、拡管用マンドレルの管内への進入速度を上げ た場合であっても、該拡管用マンドレルの拡管ビレットを介して前記管内で急激 に圧縮される空気を瞬時に管外へと排出することが出来ることから管の裂断を確 実に回避することが出来る。In the above embodiment, the pipe expanding billet is provided with a first through hole for attaching the pipe expanding billet to the pipe expanding mandrel via a mounting means such as a mounting bolt (not shown). The expansion billet is inserted from one end side to the other end side, but as shown in FIG. 3, it intersects with the axial direction of the expansion billet body on the mandrel body side peripheral surface of the expansion billet body, and In the case where the second notch groove 10 communicating with the first through hole is provided, the pipe expanding of the pipe expanding mandrel can be performed even when the speed at which the pipe expanding mandrel enters the pipe is increased. Air that is rapidly compressed in the pipe can be instantaneously discharged to the outside of the pipe through the billet, so that the pipe can be reliably prevented from tearing.
【００２２】 更に、上記実施例に於いて、拡管ビレットは取付けボルト（図示せず）等の取 付け手段を介して拡管用マンドレルに取付け可能な構成にしてなるが、例えば、 図４に示す様に、拡管ビレットに雄螺子部1c等の取付け手段が一体的に形成され て、しかも該拡管ビレットの拡管ビレット本体には、該拡管ビレット本体の一端 側から他端側にかけて第１の貫通孔が形成され、且つ該拡管ビレット本体のマン ドレル本体側の周面部に、該拡管ビレット本体の軸長方向と交差すると共に、前 記第１の貫通孔に連通する第２の貫通孔10が形成されていてもよく、更に該拡管 ビレットに、該拡管ビレットをスパナレンチ等の工具によって容易に保持するた めのビレット保持部が形成されていてもよく、該拡管ビレットの具体的な材質、 や球面の拡管作用面と該球面の球周面部から接線状態で延出された傾斜面との大 きさや長さの比率等も決して限定されないのは言うまでもない。Further, in the above embodiment, the pipe expanding billet is configured to be attachable to the pipe expanding mandrel through the attachment means such as the mounting bolts (not shown). For example, as shown in FIG. In addition, a mounting means such as a male screw portion 1c is integrally formed on the pipe expanding billet, and the pipe expanding billet main body of the pipe expanding billet has a first through hole extending from one end side to the other end side of the pipe expanding billet main body. A second through hole (10) is formed on the peripheral surface of the tube expanding billet body on the side of the mandrel body, which intersects the axial length direction of the tube expanding billet body and communicates with the first through hole. Further, a billet holding portion for easily holding the pipe expanding billet with a tool such as a spanner wrench may be formed on the pipe expanding billet, and a specific material of the pipe expanding billet, It goes without saying atmosphere and length ratio of the extending out the inclined surface or the like is also in no way limited in a tangential state from the sphere peripheral surface of the expanded working surface and the spherical surface.
【００２３】 更に、上記実施例に於いて、拡管ビレットの傾斜面と、該拡管ビレット本体の 先端部に接すべく、該拡管ビレット本体の軸長方向の中芯線と直交する仮想線の 交わりによって生じる角度は、常に60°〜75°の範囲内で形成されてなるが、必 ずしも本考案の必須の要件でないのは言うまでもなく、要は拡管ビレット本体の マンドレル本体側の一端側が、球面の拡管作用面を形成し、且つ他端側が、先端 にかけて先細状となるべく、該球面の最大径部より小さい径部の球周面部から接 線状態で延出された傾斜面を形成していればよい。Further, in the above-mentioned embodiment, the inclined surface of the pipe expanding billet and the imaginary line orthogonal to the center line in the axial direction of the pipe expanding billet body are brought into contact with the tip end of the pipe expanding billet body by intersecting them. The generated angle is always formed within the range of 60 ° to 75 °, but needless to say, it is not necessarily an essential requirement of the present invention, the point is that one end of the expansion billet body on the mandrel body side is spherical. The other end side is formed so as to be tapered toward the tip, and an inclined surface extending tangentially from the spherical peripheral surface portion having a diameter smaller than the maximum diameter portion of the spherical surface is formed. Good.
【００２４】[0024]
叙上の様に、本考案は、拡管ビレット本体のマンドレル本体側の一端側が、球 面の拡管作用面を形成し、且つ他端側が、先端にかけて先細状となるべく、該球 面の最大径部より小さい径部の球周面部から接線状態で延出された傾斜面を形成 してなることから、拡管時に前記管の内周面を初めから拡管ビレットの球面の拡 管作用面に沿わせることなく、初めに傾斜面を介して該管を徐々に、且つスムー ズに拡管させて摩擦抵抗を最少にとどめることが出来る。 As described above, according to the present invention, one end side of the mandrel body side of the tube expanding billet body forms the tube expanding action surface of the spherical surface, and the other end side is tapered to the tip so that the maximum diameter part of the spherical surface is formed. Since the sloping surface is formed so as to extend tangentially from the spherical peripheral surface of the smaller diameter portion, the inner peripheral surface of the pipe should be aligned with the spherical expansion surface of the expansion billet from the beginning during expansion. Instead, the friction resistance can be minimized by first gradually and smoothly expanding the pipe through the inclined surface.
【００２５】 更に、前記拡管ビレット本体には、該拡管ビレット本体の一端側から他端側に かけて第１の貫通孔が形成され、且つ該拡管ビレット本体のマンドレル本体側の 周面部には、該拡管ビレット本体の軸長方向と交差すると共に、前記第１の貫通 孔に連通する第２の貫通孔又は切り欠き溝が形成されてなることから、拡管用マ ンドレルの管内への進入速度を上げた場合であっても、該拡管用マンドレルの拡 管ビレットを介して前記管内で急激に圧縮される空気を瞬時に管外へと排出する ことが出来る。Further, a first through hole is formed in the pipe expanding billet body from one end side to the other end side of the pipe expanding billet body, and a peripheral surface portion of the pipe expanding billet body on the mandrel body side is formed. Since the second through hole or the notch groove that intersects with the axial direction of the pipe expanding billet body and communicates with the first through hole is formed, the speed at which the pipe expanding mandrel enters the pipe can be increased. Even when it is raised, the air that is rapidly compressed in the pipe can be instantaneously discharged to the outside of the pipe through the pipe expansion billet of the pipe expanding mandrel.
【００２６】 従って、拡管作業のスピードアップ、即ち生産性の向上を図るべく拡管用マン ドレルの管内への進入速度を上げた場合でも、前記管の内周面を急激に拡管ビレ ットの球面の拡管作用面の円弧面部に沿わせることなく、スムーズにしかも摩擦 抵抗をも最少にとどめて所定の拡管を行うことが出来るために、拡管ビレットと 管との焼きつきを多量の潤滑油を必要とすることなく完全に防止し、しかも前記 管の材厚や拡管率、更に拡管ビレットが進入する管の内径と該拡管ビレットの球 面の最大径部等との関係による管の変形や裂断も完全に防止して熱交換器の生産 性を向上させることが出来る極めて優れた拡管ビレットを提供することが出来る という格別な効果を有するに至った。Therefore, even when the speed at which the pipe expanding mandrel enters the pipe is increased in order to speed up the pipe expanding operation, that is, to improve productivity, the inner peripheral surface of the pipe is sharply changed to the spherical surface of the pipe expanding villet. Since it is possible to perform the prescribed pipe expansion smoothly and with a minimum frictional resistance without following the arc surface of the pipe expansion action surface, a large amount of lubricating oil is required to seize the pipe expansion billet and the pipe. And the pipe is deformed or torn due to the relationship between the material thickness of the pipe, the expansion ratio, and the inner diameter of the pipe into which the expansion billet enters and the maximum diameter of the spherical surface of the expansion billet. This has the special effect of being able to provide an extremely excellent expanded billet that can completely prevent the above and improve the productivity of the heat exchanger.
【図１】本考案に於ける拡管ビレットを示し、同図
（イ）は側面図、同図（ロ）は平面図。FIG. 1 shows a pipe expanding billet according to the present invention. FIG. 1 (a) is a side view and FIG. 1 (b) is a plan view.
【図２】本考案の拡管ビレットを用いた管の拡管時の状
態を示す要部拡大断面図。FIG. 2 is an enlarged sectional view of an essential part showing a state of a tube using the tube expanding billet of the present invention during tube expansion.
【図３】本考案の拡管ビレットの他の実施例を示し、同
図（イ）は側面図、同図（ロ）は平面図。3A and 3B show another embodiment of the expanding billet of the present invention, in which FIG. 3A is a side view and FIG. 3B is a plan view.
【図４】本考案の拡管ビレットの他の実施例を示し、同
図（イ）は側面図、同図（ロ）は平面図。4A and 4B show another embodiment of the expanding billet of the present invention, in which FIG. 4A is a side view and FIG. 4B is a plan view.
【図５】従来の拡管ビレットを用いた管の拡管時の状態
を示す要部拡大断面図。FIG. 5 is an enlarged cross-sectional view of an essential part showing a state of a tube using a conventional tube expansion billet during tube expansion.
１…拡管ビレット 1a…拡管ビレット本体 ２…拡管用マンドレル 2a…拡管用マンドレル本体 ３…球面の拡管作用面 3a…円弧面部 ４…球面の最大径部（直径） ６…球周面部 ７…傾斜面 Ａ…拡管ビレットの中芯線（軸長方向） Ｂ…仮想線 Ｃ…角度 1… Expansion billet 1a… Expansion billet main body 2… Expansion mandrel 2a… Expansion mandrel main body 3… Spherical expansion surface 3a… Arc surface 4… Maximum diameter part (diameter) of spherical surface 6… Spherical surface 7… Inclined surface A: Core wire of expanded billet (axial length direction) B: Virtual line C: Angle
Claims (3)
ンドレル(2) のマンドレル本体(2a)の先端に取付けられ
る拡管ビレット(1) に於いて、該拡管ビレット本体(1a)
のマンドレル本体(2a)側の一端側が、球面の拡管作用面
(3) を形成し、且つ他端側が、先端にかけて先細状とな
るべく、該球面の最大径部(4) より小さい径部(5) の球
周面部(6) から接線状態で延出された傾斜面(7) を形成
してなることを特徴とする拡管ビレット。1. A pipe expanding billet (1) attached to the tip of a mandrel body (2a) of a pipe expanding mandrel (2) for expanding a predetermined pipe (11), said pipe expanding billet body (1a).
One end of the mandrel body (2a) side is a spherical tube expansion surface
(3) is formed and the other end side is tangentially extended from the spherical peripheral surface portion (6) of the diameter portion (5) smaller than the maximum diameter portion (4) of the spherical surface so as to be tapered toward the tip. Expanding billet characterized by being formed with an inclined surface (7).
体(1a)の先端部(1b)に接すべく、該拡管ビレット本体(1
a)の軸長方向の中芯線(A) と直交する仮想線(B) の交わ
りによって生じる角度(C) が60°〜75°に形成された請
求項１記載の拡管ビレット。2. A pipe expanding billet body (1) for contacting the inclined surface (7) and a tip portion (1b) of the pipe expanding billet body (1a).
The pipe expanding billet according to claim 1, wherein the angle (C) generated by the intersection of the virtual line (B) orthogonal to the core wire (A) in the axial direction of (a) is formed at 60 ° to 75 °.
ビレット本体(1a)の一端側から他端側にかけて第１の貫
通孔(9) が形成され、且つ該拡管ビレット本体(1a)のマ
ンドレル本体(2a)側の周面部には、該拡管ビレット本体
(1a)の軸長方向と交差すると共に、前記第１の貫通孔
(9) に連通する第２の貫通孔又は切り欠き溝(10)が形成
された請求項１又は２記載の拡管ビレット。3. The pipe expanding billet body (1a) is formed with a first through hole (9) from one end side to the other end side of the pipe expanding billet body (1a), and the pipe expanding billet body (1a). On the mandrel body (2a) side peripheral surface of the
The first through hole, which intersects with the axial direction of (1a)
The pipe expanding billet according to claim 1 or 2, wherein a second through hole or a notch groove (10) communicating with (9) is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3329493U JPH073833U (en) | 1993-06-21 | 1993-06-21 | Expansion billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3329493U JPH073833U (en) | 1993-06-21 | 1993-06-21 | Expansion billet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH073833U true JPH073833U (en) | 1995-01-20 |
Family
ID=12382529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3329493U Pending JPH073833U (en) | 1993-06-21 | 1993-06-21 | Expansion billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073833U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011086713A1 (en) * | 2010-01-15 | 2011-07-21 | 京進工業株式会社 | Heat exchanger manufacturing apparatus |
| WO2011087158A3 (en) * | 2010-01-15 | 2011-09-15 | 京進工業株式会社 | Holder for pipe in heat exchanger, method and device for manufacturing heat exchanger using said holder, and air conditioner and/or outdoor unit having said heat exchanger |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS626926B2 (en) * | 1980-10-30 | 1987-02-14 | Brother Ind Ltd | |
| JPH0454531A (en) * | 1990-06-22 | 1992-02-21 | Fuji Electric Co Ltd | Program reading circuit |
-
1993
- 1993-06-21 JP JP3329493U patent/JPH073833U/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS626926B2 (en) * | 1980-10-30 | 1987-02-14 | Brother Ind Ltd | |
| JPH0454531A (en) * | 1990-06-22 | 1992-02-21 | Fuji Electric Co Ltd | Program reading circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011086713A1 (en) * | 2010-01-15 | 2011-07-21 | 京進工業株式会社 | Heat exchanger manufacturing apparatus |
| JP2011161515A (en) * | 2010-01-15 | 2011-08-25 | Kyoshin Kogyo Kk | Holder for insertion pipe in heat exchanger, method and device for manufacturing heat exchanger using the holder, and air conditioner and/or outdoor equipment having manufactured heat exchanger |
| WO2011087158A3 (en) * | 2010-01-15 | 2011-09-15 | 京進工業株式会社 | Holder for pipe in heat exchanger, method and device for manufacturing heat exchanger using said holder, and air conditioner and/or outdoor unit having said heat exchanger |
| CN102510780A (en) * | 2010-01-15 | 2012-06-20 | 京进工业株式会社 | Holder for insertion tube of heat exchanger, method and device for manufacturing heat exchanger using same, air conditioner and/or outdoor unit |
| CN102510780B (en) * | 2010-01-15 | 2015-06-17 | 京进工业株式会社 | Holder for insertion tube of heat exchanger, method and device for manufacturing heat exchanger using same, air conditioner and/or outdoor unit |
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