JP5695533B2 - Pipe material cutting method and cutting device therefor - Google Patents

Pipe material cutting method and cutting device therefor Download PDF

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JP5695533B2
JP5695533B2 JP2011201431A JP2011201431A JP5695533B2 JP 5695533 B2 JP5695533 B2 JP 5695533B2 JP 2011201431 A JP2011201431 A JP 2011201431A JP 2011201431 A JP2011201431 A JP 2011201431A JP 5695533 B2 JP5695533 B2 JP 5695533B2
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pipe material
cutting
cut
slit
mold
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JP2013059845A (en
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林太郎 山下
林太郎 山下
知彦 赤澤
知彦 赤澤
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Yutaka Giken Co Ltd
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Description

本発明は，パイプ材の外周側に配設される外刃と，パイプ材の内周側に配設される内刃との半径方向に沿う相対移動に伴ない剪断作用によりパイプ材を切断するパイプ材の切断方法及びその切断装置の改良に関する。   The present invention cuts a pipe material by a shearing action accompanying relative movement along the radial direction between an outer blade disposed on the outer peripheral side of the pipe material and an inner blade disposed on the inner peripheral side of the pipe material. The present invention relates to a pipe material cutting method and an improvement of the cutting apparatus.

かゝるパイプ材の切断方法及び装置は，下記特許文献１に開示されているように既に知られている。   Such a pipe material cutting method and apparatus are already known as disclosed in Patent Document 1 below.

特開２００８−２００７６５号公報JP 2008-200765 A

特許文献１に開示されるように，従来のパイプ材の切断方法及び装置は，外刃を環状の固定刃とし，内刃をパイプ材の周方向に配列される複数の分割刃とし，その分割刃群を固定刃に対して半径方向外向きに作動することで，分割刃群側のパイプ材を拡径させながら固定刃及び分断刃群に剪断作用を発揮させてパイプ材を切断するものである。こうした切断方法及び装置では，分割刃群の半径方向外向きの移動により分割刃の相互間に隙間ができるため，綺麗な切断面を得ることが困難な上，切断される側のパイプ材は，半径方向外向きに移動する分割刃群により拡径され，肉厚が減少するという不都合が生じる。   As disclosed in Patent Document 1, a conventional pipe material cutting method and apparatus has an outer blade as an annular fixed blade, and an inner blade as a plurality of divided blades arranged in the circumferential direction of the pipe material. By operating the blade group radially outward relative to the fixed blade, the pipe material is cut by causing the fixed blade and the cutting blade group to exert a shearing action while expanding the pipe material on the divided blade group side. is there. In such a cutting method and apparatus, since the gap between the divided blades is created by the radially outward movement of the divided blade group, it is difficult to obtain a clean cut surface, and the pipe material on the side to be cut is The diameter is increased by the group of divided blades moving outward in the radial direction, resulting in a disadvantage that the thickness is reduced.

本発明は，かゝる事情に鑑みてなされたもので，肉厚の変化を生じさせることなく，しかも切断面を綺麗にしながらパイプ材を切断し得るパイプ材の切断方法及びその切断装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and provides a pipe material cutting method and a cutting apparatus for the pipe material that can cut the pipe material while keeping the cutting surface clean without causing a change in wall thickness. The purpose is to do.

上記目的を達成するために，本発明のパイプ材の切断方法は，切断すべきパイプ材として，外周に有する一条のスリットの幅を増減させるように変形し得るスリット付きパイプ材を用意し，このスリット付きパイプ材に所望長さの切断領域を設定する工程と，前記切断領域以外の領域でスリット付きパイプ材の内周面に，一端外周縁に環状の内刃を有する芯型を嵌合して，前記内刃を前記切断領域の内端位置に合わせながら前記スリットの幅を一定寸法に広げた状態にスリット付きパイプ材を保持する工程と，一端内周縁に円弧状の外刃を有する複数のカット型を，その外刃を前記切断領域の内端位置に合わせながら該切断領域のスリット付きパイプ材の外周面上に相互に一定間隔をおいて環状に配列する工程と，環状に配列した前記複数のカット型を半径方向内向きに作動することにより，前記切断領域のスリット付きパイプ材を縮径変形させながら，前記内刃及び外刃に剪断作用を発揮させて前記切断領域の内端位置でスリット付きパイプ材を切断する工程とを含むことを第１の特徴とする。   In order to achieve the above object, the pipe material cutting method of the present invention provides a pipe material with slits that can be deformed so as to increase or decrease the width of a single slit on the outer periphery as a pipe material to be cut. A step of setting a cutting region of a desired length in the pipe material with slits, and a core die having an annular inner blade at one outer peripheral edge is fitted to the inner peripheral surface of the pipe material with slits in a region other than the cutting region. And holding the pipe material with a slit in a state in which the width of the slit is expanded to a certain size while aligning the inner blade with the inner end position of the cutting region, and a plurality of arc-shaped outer blades at one inner peripheral edge And a step of arranging the outer cutter in an annular manner on the outer peripheral surface of the pipe member with slits in the cutting region while aligning the outer blade with the inner end position of the cutting region, The plurality By operating the pipe mold inward in the radial direction, the inner and outer blades exert a shearing action while reducing the diameter of the pipe material with slits in the cutting area, and at the inner end position of the cutting area. The first feature is that it includes a step of cutting the pipe material with slits.

また本発明は，第１の特徴のパイプ材の切断方法を実施するためのパイプ材の切断装置であって，前記芯型と協働して前記切断領域以外のスリット付きパイプ材を押えるように一対の下部及び上部保持型を備え，その下部保持型を下部弾性部材を介して下型ホルダに支持する一方，上部保持型を，前記下型ホルダに対して昇降し得る上型ホルダに上部弾性部材を介して支持し，前記切断領域のスリット付きパイプ材の外周面上に配置される一対の下部カット型及び上部カット型を前記下型ホルダ及び上型ホルダにそれぞれ固定して取り付け，前記下型ホルダに対して前記上型ホルダを下降させることによって，前記下部及び上部弾性部材を圧縮変形させて，前記下部及び上部保持型のスリット付きパイプ材に対する保持力を強めると共に，前記切断領域のスリット付きパイプ材を縮径変形させながら，前記内刃及び外刃に剪断作用を発揮させて前記切断領域の内端位置でスリット付きパイプ材を切断するように，前記上部カット型を前記下部カット型に対して作動するようにしたことを第２の特徴とする。   The present invention is also a pipe material cutting device for carrying out the pipe material cutting method of the first feature, wherein the pipe material with slits other than the cutting region is pressed in cooperation with the core mold. A pair of lower and upper holding molds are provided, and the lower holding mold is supported by the lower mold holder via the lower elastic member, while the upper holding mold is supported by the upper mold holder that can be moved up and down relative to the lower mold holder. A pair of lower cut mold and upper cut mold, which are supported via a member and arranged on the outer peripheral surface of the pipe material with slits in the cutting region, are fixedly attached to the lower mold holder and the upper mold holder, respectively, By lowering the upper mold holder with respect to the mold holder, the lower and upper elastic members are compressed and deformed to increase the holding force for the pipe material with slits of the lower and upper holding molds, The upper cut die is cut so that the inner and outer blades exert a shearing action while cutting the slit pipe material at the inner end position of the cutting area while reducing the diameter of the slit pipe material in the cutting area. The second feature is that it operates with respect to the lower cut die.

本発明の第１の特徴によれば，環状に配列した複数のカット型を半径方向内向きに作動することにより，切断領域のスリット付きパイプ材を縮径変形させながら，芯型の内刃と環状配列の複数のカット型外刃との剪断作用によりスリット付きパイプ材を切断するので，切断領域のスリット付きパイプ材の縮径時には，そのスリットの幅の縮小を伴なうことで，スリット付きパイプ材に座屈による皺の発生や，肉厚の変化を防ぐことができ，しかもその切断時には，環状配列の複数のカット型の外刃は，相互間に殆ど隙間が無い環状を呈することになって良好な剪断作用を発揮することができ，これらにより綺麗な切断面を得ることができる。   According to the first feature of the present invention, by operating a plurality of cut dies arranged in a ring inward in the radial direction, the pipe material with slits in the cutting region is deformed in a reduced diameter, Since the pipe material with slits is cut by the shearing action with a plurality of cut-type outer blades in an annular arrangement, when the diameter of the pipe material with slits in the cutting area is reduced, the slit width is reduced, accompanied by the reduction of the slit width. It is possible to prevent the occurrence of wrinkles due to buckling and changes in wall thickness in the pipe material, and at the time of cutting, the plurality of cut type outer blades in an annular arrangement exhibit an annular shape with almost no gap between them. Therefore, a good shearing action can be exhibited, and a beautiful cut surface can be obtained by these.

本発明の第２の特徴によれば，芯型と，一対の下部及び上部カット型を有する構造簡単な切断装置によりスリット付きパイプ材を，皺や肉厚の変化を生じさせることなく綺麗に切断することができる。   According to the second feature of the present invention, a pipe material with slits is cut cleanly without causing wrinkles or wall thickness changes by a simple cutting device having a core mold and a pair of lower and upper cut molds. can do.

本発明のパイプ切断方法及び装置により切断すべきスリット付きパイプ材の斜視図。The perspective view of the pipe material with a slit which should be cut | disconnected by the pipe cutting method and apparatus of this invention. 本発明の実施形態に係るパイプ切断装置の縦断正面図（図３の１−１線断面図）で，ワークとしてのスリット付きパイプ材をセットした状態を示す。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal front view of a pipe cutting device according to an embodiment of the present invention (sectional view taken along line 1-1 in FIG. 3), showing a state in which a pipe with a slit as a workpiece is set. 図２の３−３線断面図。FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. 図２の４−４線断面図。FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 上記ワークの押え込み状態を示す，図２との対応図。FIG. 3 is a diagram corresponding to FIG. 2 showing a pressing state of the workpiece. 図５の６−６線断面図。FIG. 6 is a sectional view taken along line 6-6 of FIG. 図５の７−７線断面図。FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 上記ワークの切断終了状態を示す，図２及び図５との対応図。FIG. 6 is a view corresponding to FIG. 2 and FIG. 図８の９−９線断面図。FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 8. 図８の１０−１０線断面図。FIG. 10 is a sectional view taken along line 10-10 in FIG. 8; 本発明の別の実施形態を示す，三個以上のカット型の横断面図。The cross-sectional view of three or more cut dies showing another embodiment of the present invention.

本発明の実施の形態を添付図面に基づいて以下に説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

先ず，図１において，切断すべきパイプ材として，外周に有する一条のスリット２の幅を増減させるように変形し得るスリット付きパイプ材１が用意される。このスリット付きパイプ材１には所望長さの切断領域Ａが設定される。   First, in FIG. 1, a pipe material 1 with a slit that can be deformed so as to increase or decrease the width of one slit 2 on the outer periphery is prepared as a pipe material to be cut. A cutting region A having a desired length is set in the pipe material 1 with a slit.

次に，このスリット付きパイプ材１を切断するパイプ切断装置について説明する。   Next, a pipe cutting device for cutting the pipe material 1 with slit will be described.

先ず図２〜図３において，パイプ切断装置５は，プレス機械のボルスタ（図示せず。）に支持される下型ホルダ６と，同プレス機械のスライド（図示せず。）に支持される上型ホルダ７とを有する。下型ホルダ６には，芯型８，下部保持型１０及び下部カット型１２ａが配設され，プレス機械のスライドに支持される上型ホルダ７には，上部保持型１１及び上部カット型１２ｂが配設される。下型ホルダ６の上面には，鉛直方向に延びる複数のガイドポスト１３，１３…が立設され，これらガイドポスト１３，１３…が摺動自在に嵌合して，上型ホルダ７の昇降姿勢を安定させる複数のガイドボス１４，１４…が上型ホルダ７に固設される。   2 to 3, the pipe cutting device 5 is supported by a lower mold holder 6 supported by a bolster (not shown) of a press machine and a slide (not shown) of the press machine. And a mold holder 7. The lower mold holder 6 is provided with a core mold 8, a lower holding mold 10 and a lower cut mold 12a, and the upper mold holder 7 supported by the slide of the press machine is provided with an upper holding mold 11 and an upper cut mold 12b. Arranged. A plurality of guide posts 13 extending in the vertical direction are erected on the upper surface of the lower mold holder 6, and the guide posts 13, 13. Are fixed to the upper die holder 7.

前記芯型８は，スリット付きパイプ材１の内周面に嵌合して，そのスリット２を所定幅に開いた状態に保持するように形成されたもので，その一端部周縁には環状の内刃１８が形成される。この芯型８の外周面には，上記スリット２を貫通して，下型ホルダ６の，鉛直方向に延びる支持孔１５に摺動自在に嵌装される支持ロッド８ａが一体に突設される。   The core mold 8 is formed so as to be fitted to the inner peripheral surface of the pipe material 1 with slit and to hold the slit 2 in a state of being opened to a predetermined width. An inner blade 18 is formed. A support rod 8 a that is slidably fitted into a support hole 15 extending in the vertical direction of the lower mold holder 6 is integrally provided on the outer peripheral surface of the core mold 8 so as to penetrate the slit 2. .

前記下部保持型１０は，下部弾性部材１６を介して下型ホルダ６に上下動可能に支持され，また前記上部保持型１１は，上部弾性部材１７を介して上型ホルダ７に上下動可能に支持されるもので，これら下部及び上部保持型１０，１１の対向面には，前記芯型８と協働してスリット付きパイプ材１の周壁を内外から挟圧，保持する半円筒状の保持面１０ａ，１１ａが形成される。   The lower holding mold 10 is supported on the lower mold holder 6 via a lower elastic member 16 so as to be movable up and down, and the upper holding mold 11 is movable up and down on the upper mold holder 7 via an upper elastic member 17. A semi-cylindrical holding that holds and holds the peripheral wall of the pipe material 1 with slits from the inside and outside in cooperation with the core die 8 on the opposing surfaces of the lower and upper holding dies 10 and 11. Surfaces 10a and 11a are formed.

下部保持型１０の下型ホルダ６に対する上下動は，下部保持型１０に設けられる鉛直方向の複数の下部支持孔１５を，下型ホルダ６の上面に立設される一対の下部ガイド・ストッパボルト２１，２１に摺動自在に嵌合することで規制され，また上部保持型１１の上型ホルダ７に対する上下動は，この上部保持型１１に設けられる鉛直方向の複数の上部支持孔１５を，上型ホルダ７の下面に立設される一対の上部ガイド・ストッパボルト２２，２２に摺動自在に嵌合することで規制される。その際，下部及び上部保持型１０，１１は，それぞれの一端面が前記芯型８の内刃１８と略面一となるように配置される。実際には，スリット付きパイプ材１の材質や切断面精度，刃の耐久性等を考慮して，下部及び上部保持型１０，１１の各一端面と芯型８の内刃１８との間には適当な微小クリアランスが設定される。   The vertical movement of the lower holding die 10 with respect to the lower die holder 6 is performed by a pair of lower guide / stopper bolts erected on the upper surface of the lower die holder 6 through a plurality of vertical lower support holes 15 provided in the lower holding die 10. The upper and lower movements of the upper holding die 11 with respect to the upper die holder 7 are regulated by slidingly fitting to the upper holding die 11 through a plurality of vertical upper support holes 15 provided in the upper holding die 11. It is regulated by slidably fitting a pair of upper guide / stopper bolts 22, 22 erected on the lower surface of the upper holder 7. At that time, the lower and upper holding molds 10 and 11 are arranged so that the respective end faces thereof are substantially flush with the inner blade 18 of the core mold 8. Actually, considering the material of the pipe material 1 with the slit, the accuracy of the cut surface, the durability of the blade, etc., between each end surface of the lower and upper holding molds 10 and 11 and the inner blade 18 of the core mold 8. An appropriate minute clearance is set.

前記下部カット型１２ａは，下型ホルダ６の上面に固定して取り付けられ，また前記上部カット型１２ｂは，上型ホルダ７の下面に固定して取り付けられるもので，その際，下部カット型１２ａは，下部保持型１０の一端面に摺動自在に当接配置され，また上部カット型１２ｂは，上部保持型１１の一端面に摺動自在に略当接配置される。こゝでも実際には，スリット付きパイプ材１の材質や切断面精度，刃の耐久性等を考慮して，上部カット型１２ｂと上部保持型１１との対向面間には適当な微小クリアランスが設定される。   The lower cut die 12a is fixedly attached to the upper surface of the lower die holder 6, and the upper cut die 12b is fixedly attached to the lower surface of the upper die holder 7. At this time, the lower cut die 12a Is slidably placed on one end surface of the lower holding die 10, and the upper cut die 12 b is slidably placed on one end surface of the upper holding die 11. Actually, however, in consideration of the material of the pipe material 1 with the slit, the accuracy of the cut surface, the durability of the blade, etc., there is an appropriate minute clearance between the opposed surfaces of the upper cut die 12b and the upper holding die 11. Is set.

これら下部及び上部カット型１２ａ，１２ｂは，上型ホルダ７が前記下降限界まで下降したとき，互いに当接させる対向面を有しており，それらの対向面には，切断領域Ａのスリット付きパイプ材１を押圧，縮径させ得る半円筒状の押圧面２０ａ，２０ｂが形成される（図１０参照）。更にこれら半円筒状の押圧面２０ａ，２０ｂの，前記下部及び上部保持型１０，１１側の内周縁には半円状の外刃１９ａ，１９ｂが形成される。   These lower and upper cut dies 12a and 12b have opposing surfaces that are brought into contact with each other when the upper die holder 7 is lowered to the lowering limit. Semi-cylindrical pressing surfaces 20a and 20b capable of pressing and reducing the diameter of the material 1 are formed (see FIG. 10). Further, semicircular outer blades 19a, 19b are formed on the inner peripheral edges of the semi-cylindrical pressing surfaces 20a, 20b on the lower and upper holding molds 10, 11 side.

而して，下部及び上部カット型１２ａ，１２ｂが互いに対向面を当接させたとき（図１０参照），押圧面２０ａ，２０ｂは，切断領域Ａのスリット付きパイプ材１を，その外径が芯型８の外径と一致するように縮径することができ，同時に半円状の外刃１９ａ，１９ｂは，芯型８即ち内刃１８の外径と一致する隙間の無い環状を呈するようになっている。   Thus, when the lower and upper cut dies 12a and 12b are brought into contact with each other (see FIG. 10), the pressing surfaces 20a and 20b are formed of the slit pipe material 1 in the cutting region A and the outer diameter thereof. The diameter can be reduced to match the outer diameter of the core mold 8, and at the same time, the semicircular outer blades 19 a, 19 b can have an annular shape with no gap corresponding to the outer diameter of the core mold 8, that is, the inner blade 18. It has become.

上記パイプ切断装置５を使用してスリット付きパイプ材１を切断する方法を次に説明する。   Next, a method of cutting the pipe material 1 with slits using the pipe cutting device 5 will be described.

先ず，図１に示すように，切断すべく用意したスリット付きパイプ材１に，前述のように所望長さの切断領域Ａを設定する。   First, as shown in FIG. 1, a cutting region A having a desired length is set in the pipe material 1 with a slit prepared for cutting as described above.

次に，図２に示すように，上型ホルダ７を上昇位置に保持した状態において，上記スリット付きパイプ材１を矢印Ｐに沿って前進させて芯型８の後端側からその外周面に嵌合していくと，スリット２が所定幅に開きながら，芯型８の支持ロッド８ａを受け入れていく。そしてスリット付きパイプ材１の外周面下半周を下部保持型１０の保持面１０ａに支承させながら，スリット付きパイプ材１の切断領域Ａを芯型８の内刃１８より外方へ張り出させて，切断領域Ａの内端位置を内刃１８に合わせる。   Next, as shown in FIG. 2, in the state where the upper mold holder 7 is held in the raised position, the pipe material 1 with the slit is advanced along the arrow P so as to move from the rear end side of the core mold 8 to the outer peripheral surface thereof. When fitted, the support rod 8a of the core mold 8 is received while the slit 2 opens to a predetermined width. Then, the cutting area A of the pipe material 1 with the slit is extended outward from the inner blade 18 of the core mold 8 while supporting the lower half of the outer peripheral surface of the pipe material 1 with the slit on the holding surface 10a of the lower holding mold 10. , The inner end position of the cutting area A is aligned with the inner blade 18.

そこで，図５〜図７に示すように，上型ホルダ７を下降させると，上部保持型１１も下降してその保持面１１ａが芯型８との対応位置でスリット付きパイプ材１の外周面上半周に当接する。   Therefore, as shown in FIGS. 5 to 7, when the upper die holder 7 is lowered, the upper holding die 11 is also lowered, and the holding surface 11 a is located at the position corresponding to the core die 8 and the outer peripheral surface of the pipe material 1 with slits. Abuts the upper half circumference.

上型ホルダ７が更に下降すると，下部及び上部弾性部材１６，１７が圧縮され，その反発力が下部及び上部保持型１０，１１に加わることで，下部及び上部保持型１０，１１は，芯型８と協働してスリット付きパイプ材１を強固に挟持しながら更に下降していく。即ち，下部及び上部保持型１０，１１，スリット付きパイプ材１，芯型８の四者が一体となって下降する。   When the upper mold holder 7 is further lowered, the lower and upper elastic members 16 and 17 are compressed, and the repulsive force is applied to the lower and upper holding molds 10 and 11, so that the lower and upper holding molds 10 and 11 are core-shaped. The pipe material 1 with slits is further lowered while cooperating with 8. That is, the lower and upper holding molds 10 and 11, the slit pipe member 1, and the core mold 8 are lowered together.

一方，切断領域Ａのスリット付きパイプ材１は，その下降により下部カット型１２ａに近づき，また上部カット型１２ｂは上型ホルダ７の下降により切断領域Ａのスリット付きパイプ材１に近づいていく。こうして下部及び上部カット型１２ａ，１２ｂは，切断領域Ａのスリット付きパイプ材１の外周面を押圧して，スリット２の幅の縮小を伴ないつゝそれを縮径させていく。   On the other hand, the pipe material 1 with the slit in the cutting area A approaches the lower cut mold 12 a by the lowering, and the upper cut mold 12 b approaches the pipe material 1 with the slit in the cutting area A by the lowering of the upper mold holder 7. In this way, the lower and upper cut dies 12a and 12b press the outer peripheral surface of the pipe member 1 with the slit in the cutting area A, and reduce the diameter of the slit 2 with the reduction of the width of the slit 2.

したがって，下部及び上部カット型１２ａ，１２ｂの半円状の外刃１９ａ，１９ｂは，芯型８の内刃１８に向かいながらスリット付きパイプ材１をその外周側から剪断していき，その剪断終了位置では，図８〜図１０に示すように，下部及び上部カット型１２ａ，１２ｂが対向面を相互に当接させて両外刃１９ａ，１９ｂを相互に隙間が無い環状に配置させる。かくして，スリット付きパイプ材１は切断領域Ａの内端位置で切断される。そして上型ホルダ７の下降は，下部及び上部カット型１２ａ，１２ｂ同士が当接することで停止する。   Therefore, the semicircular outer blades 19a and 19b of the lower and upper cut dies 12a and 12b shear the pipe material 1 with the slit from the outer peripheral side while facing the inner blade 18 of the core die 8, and the shearing ends. At the position, as shown in FIGS. 8 to 10, the lower and upper cut dies 12 a and 12 b abut the opposing surfaces to each other, and the outer blades 19 a and 19 b are arranged in an annular shape with no gap therebetween. Thus, the slitted pipe member 1 is cut at the inner end position of the cutting region A. The lowering of the upper mold holder 7 stops when the lower and upper cut molds 12a and 12b come into contact with each other.

切断後，上型ホルダ７を上昇させれば，図２〜図４に示すように，上部カット型１２ｂは下部カット型１２ａから遠く離間し，下部及び上部保持型１０，１１は，下部及び上部弾性部材１６，１７の復元力により当初位置に戻ることになる。   When the upper die holder 7 is raised after cutting, as shown in FIGS. 2 to 4, the upper cut die 12b is far away from the lower cut die 12a, and the lower and upper holding dies 10 and 11 are lower and upper. It returns to the initial position by the restoring force of the elastic members 16 and 17.

しかる後，切断された切断領域Ａのスリット付きパイプ材１を取り出し，芯型８上に残ったスリット付きパイプ材１を，新たに設定した切断領域Ａの長さ分だけ，スリット付きパイプ材１を矢印Ｐに沿って前進させ，以後，上記と同様な作業を繰り返す。   Thereafter, the pipe material 1 with the slit in the cut area A is taken out, and the pipe material 1 with the slit remaining on the core die 8 is removed by the length of the newly set cutting area A. Is advanced along the arrow P, and thereafter the same operation as above is repeated.

次に，図１１に示す本発明の第２実施形態について説明する。   Next, a second embodiment of the present invention shown in FIG. 11 will be described.

この第２実施形態は，各内周縁に外刃１９ａ〜１９ｆを有する六個のカット型１２ａ〜１２ｆをスリット付きパイプ材１の切断領域Ａ外周に配列して，これらを半径方向内向きに作動して，芯型８の内刃１８との協働による剪断作用により切断領域Ａのスリット付きパイプ材１を切断するようにしたもので，その他の構成は前実施形態と同様であるので，図１１中，前実施形態と対応する部分には同一の参照符号を付して重複する説明を省略する。   In the second embodiment, six cut dies 12a to 12f having outer blades 19a to 19f on the inner peripheral edges are arranged on the outer periphery of the cutting area A of the pipe material 1 with slits, and these are operated radially inward. The pipe material 1 with the slit in the cutting region A is cut by a shearing action in cooperation with the inner blade 18 of the core die 8, and other configurations are the same as those in the previous embodiment. 11, the same reference numerals are assigned to portions corresponding to those of the previous embodiment, and redundant description is omitted.

上記のように，本発明のパイプ材の切断方法によれば，環状に配列した複数のカット型１２ａ，１２ｂ；１２ａ〜１２ｆを半径方向内向きに作動することにより，切断領域Ａのスリット付きパイプ材１を縮径変形させながら，芯型８の内刃１８と環状配列の複数のカット型１２ａ，１２ｂ；１２ａ〜１２ｆの外刃１９ａ，１９ｂ；１９ａ〜１９ｆとの剪断作用によりスリット付きパイプ材１を切断するので，切断領域Ａのスリット付きパイプ材１の縮径時には，そのスリット２の幅の縮小を伴なうことで，スリット付きパイプ材１に座屈による皺の発生や肉厚の変化を防ぐことができ，しかもその切断時には，環状配列の複数のカット型１２ａ，１２ｂ；１２ａ〜１２ｆの外刃１９ａ，１９ｂ；１９ａ〜１９ｆは，相互間に殆ど隙間が無い環状を呈することになって良好な剪断作用を発揮するので，綺麗な切断面を得ることができる。   As described above, according to the method for cutting a pipe material of the present invention, the plurality of cut dies 12a, 12b; Pipe material with slits due to the shearing action of the inner cutter 18 of the core mold 8 and the plurality of cut dies 12a, 12b; outer cutters 19a, 19b; 1 is cut, when the pipe material 1 with slits in the cutting area A is reduced in diameter, the width of the slit 2 is reduced, so that the pipe material 1 with slits generates wrinkles due to buckling or is thick. It is possible to prevent the change, and at the time of cutting, the outer cutters 19a, 19b; 19a-19f of the plurality of cut dies 12a, 12b; Since exhibit good shear supposed to exhibit, it is possible to obtain a clean cut surface.

また本発明のパイプ材の切断装置５によれば，芯型８と，一対の下部及び上部カット型１２ａ，１２ｂを有する簡単な構造によりスリット付きパイプ材１を，皺や肉厚の変化を生じせることなく綺麗に切断することができる。   Further, according to the pipe material cutting device 5 of the present invention, the pipe material 1 with slits is caused to change in wrinkles and wall thickness by a simple structure having the core die 8 and a pair of lower and upper cut dies 12a and 12b. It can be cut neatly without damaging.

尚，所望寸法に切断されたスリット付きパイプ材１は，スリット２に臨む両側端を溶接することにより，通常のパイプに構成することができる。   In addition, the pipe material 1 with a slit cut | disconnected to the desired dimension can be comprised in a normal pipe by welding the both ends which face the slit 2. FIG.

本発明は上記実施形態に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば，切断領域のスリット付きパイプ材の周囲に配列するカット型は複数であればよく，その数を問わない。   The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, there may be a plurality of cut dies arranged around the slitted pipe material in the cutting region, and the number thereof is not limited.

Ａ・・・・・・切断領域
１・・・・・・スリット付きパイプ材
６・・・・・・下型ホルダ
７・・・・・・上型ホルダ
８・・・・・・芯型
１０・・・・・下部保持型
１１・・・・・上部保持型
１２ａ，１２ｂ・・・カット型（下部，上部カット型）
１６・・・・・下部弾性部材
１７・・・・・上部弾性部材
１８・・・・・内刃
１９ａ，１９ｂ・・・外刃 A ··· Cutting area 1 ··· Pipe material 6 with slit ··· Lower die holder 7 ··· Upper die holder 8 · · · Core 10 ... Lower holding mold 11 ... Upper holding mold 12a, 12b ... Cut type (lower and upper cut type)
16 ... Lower elastic member 17 ... Upper elastic member 18 ... Inner blades 19a, 19b ... Outer blade

Claims (2)

切断すべきパイプ材として，外周に有する一条のスリット（２）の幅（Ｓ）を増減させるように変形し得るスリット付きパイプ材（１）を用意し，このスリット付きパイプ材（１）に所望長さの切断領域（Ａ）を設定する工程と，
前記切断領域（Ａ）以外の領域でスリット付きパイプ材（１）の内周面に，一端外周縁に環状の内刃（１８）を有する芯型（８）を嵌合して，前記内刃（１８）を前記切断領域（Ａ）の内端位置に合わせながら前記スリット（２）の幅（Ｓ）を一定寸法に広げた状態にスリット付きパイプ材（１）を保持する工程と，
一端内周縁に円弧状の外刃（１９ａ，１９ｂ）を有する複数のカット型（１２ａ，１２ｂ）を，その外刃（１９ａ，１９ｂ）を前記切断領域（Ａ）の内端位置に合わせながら該切断領域（Ａ）のスリット付きパイプ材（１）の外周面上に相互に一定間隔をおいて環状に配列する工程と，
環状に配列した前記複数のカット型（１２ａ，１２ｂ）を半径方向内向きに作動することにより，前記切断領域（Ａ）のスリット付きパイプ材（１）を縮径変形させながら，前記内刃（１８）及び外刃（１９ａ，１９ｂ）に剪断作用を発揮させて前記切断領域（Ａ）の内端位置でスリット付きパイプ材（１）を切断する工程とを含むことを特徴とする，パイプ材の切断方法。 As a pipe material to be cut, a pipe material (1) with a slit that can be deformed so as to increase or decrease the width (S) of the slit (2) on the outer periphery is prepared. Setting a length cutting area (A);
A core mold (8) having an annular inner blade (18) at one outer peripheral edge is fitted to the inner peripheral surface of the pipe material (1) with slits in a region other than the cutting region (A), and the inner blade Holding the pipe material (1) with a slit in a state in which the width (S) of the slit (2) is expanded to a constant dimension while aligning (18) with the inner end position of the cutting region (A);
A plurality of cut dies (12a, 12b) having arcuate outer blades (19a, 19b) at the inner peripheral edge of one end, and the outer blades (19a, 19b) are aligned with the inner end position of the cutting region (A). A step of annularly arranging on the outer peripheral surface of the slit pipe member (1) in the cutting region (A) at regular intervals;
By operating the plurality of cut dies (12a, 12b) arranged in an annular shape inward in the radial direction, the inner blade ( 18) and the step of causing the outer blades (19a, 19b) to exert a shearing action and cutting the pipe material (1) with slits at the inner end position of the cutting region (A). Cutting method. 請求項１記載のパイプ材の切断方法を実施するためのパイプ材の切断装置であって，
前記芯型（８）と協働して前記切断領域以外のスリット付きパイプ材（１）を押えるように一対の下部及び上部保持型（１０，１１）を備え，その下部保持型（１２ａ）を下部弾性部材（１６）を介して下型ホルダ（６）に支持する一方，上部保持型（１２ｂ）を，前記下型ホルダ（６）に対して昇降し得る上型ホルダ（７）に上部弾性部材（１７）を介して支持し，
前記切断領域（Ａ）のスリット付きパイプ材（１）の外周面上に配置される一対の下部カット型（１２ａ）及び上部カット型（１２ｂ）を前記下型ホルダ（６）及び上型ホルダ（７）にそれぞれ固定して取り付け，
前記下型ホルダ（６）に対して前記上型ホルダ（７）を下降させることによって，前記下部及び上部弾性部材（１６，１７）を圧縮変形させて，前記下部及び上部保持型（１０，１１）のスリット付きパイプ材（１）に対する保持力を強めると共に，前記切断領域（Ａ）のスリット付きパイプ材（１）を縮径変形させながら，前記内刃（１８）及び外刃（１９ａ，１９ｂ）に剪断作用を発揮させて前記切断領域（Ａ）の内端位置でスリット付きパイプ材（１）を切断するように，前記上部カット型（１２ｂ）を前記下部カット型（１２ａ）に対して作動するようにしたことを特徴とする，パイプ材の切断装置。 A pipe material cutting device for carrying out the pipe material cutting method according to claim 1,
A pair of lower and upper holding molds (10, 11) are provided so as to press the pipe material (1) with slits other than the cutting region in cooperation with the core mold (8), and the lower holding mold (12a) is provided. While supporting the lower mold holder (6) via the lower elastic member (16), the upper holding mold (12b) is elasticated to the upper mold holder (7) which can be moved up and down relative to the lower mold holder (6). Supported via a member (17),
A pair of lower cut mold (12a) and upper cut mold (12b) disposed on the outer peripheral surface of the pipe material (1) with slits in the cutting area (A) is replaced with the lower mold holder (6) and the upper mold holder ( 7) each fixedly attached,
By lowering the upper mold holder (7) with respect to the lower mold holder (6), the lower and upper elastic members (16, 17) are compressed and deformed to form the lower and upper holding molds (10, 11). ) And the inner blade (18) and the outer blades (19a, 19b) while strengthening the holding force of the slit pipe material (1) and reducing the diameter of the slit pipe material (1) in the cutting region (A). The upper cut die (12b) is moved relative to the lower cut die (12a) so as to cut the pipe material (1) with slits at the inner end position of the cutting region (A) by exerting a shearing action. A pipe material cutting device characterized by being operated.
JP2011201431A 2011-09-15 2011-09-15 Pipe material cutting method and cutting device therefor Expired - Fee Related JP5695533B2 (en)

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