JP6760190B2 - Seamless steel pipe cutting device - Google Patents

Seamless steel pipe cutting device Download PDF

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JP6760190B2
JP6760190B2 JP2017076550A JP2017076550A JP6760190B2 JP 6760190 B2 JP6760190 B2 JP 6760190B2 JP 2017076550 A JP2017076550 A JP 2017076550A JP 2017076550 A JP2017076550 A JP 2017076550A JP 6760190 B2 JP6760190 B2 JP 6760190B2
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seamless steel
steel pipe
cutting machine
pipe
product
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祐介 中村
祐介 中村
明 蘆立
明 蘆立
裕之 山▲崎▼
裕之 山▲崎▼
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JFE Steel Corp
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Description

本発明は、継目無鋼管から所定の長さを有する製品管を切り出す継目無鋼管の加工装置、継目無鋼管の切断方法および切断装置に関する。 The present invention relates to a seamless steel pipe processing device for cutting a product pipe having a predetermined length from a seamless steel pipe, a method for cutting the seamless steel pipe, and a cutting device.

一般に、熱間加工で製造される継目無鋼管の管端にはクロップが発生する。そのため、継目無鋼管の一連の製造工程には、クロップを切断して除去し、さらに面取り加工を行なう切断工程が必要である（特許文献１、２参照）。 Generally, cropping occurs at the end of a seamless steel pipe manufactured by hot working. Therefore, in a series of manufacturing steps of the seamless steel pipe, a cutting step of cutting and removing the crop and further chamfering is required (see Patent Documents 1 and 2).

図５は、クロップの切断工程で使用される切断装置の一例を模式的に示す平面図である。図５に示すように、切断装置は、テーブル２（２ａ、２ｂ、２ｃ）、第１切断機３ａ、第２切断機３ｂ、第１搬送ロール群４ａ、第２搬送ロール群４ｂを有する。第１切断機３ａと第２切断機３ｂは、管軸方向に対してテーブル２の両側に配設される。 FIG. 5 is a plan view schematically showing an example of a cutting device used in the crop cutting step. As shown in FIG. 5, the cutting device includes a table 2 (2a, 2b, 2c), a first cutting machine 3a, a second cutting machine 3b, a first transfer roll group 4a, and a second transfer roll group 4b. The first cutting machine 3a and the second cutting machine 3b are arranged on both sides of the table 2 with respect to the pipe axis direction.

切断工程においては、まず、継目無鋼管１をテーブル２に載置して、管軸方向に垂直な方向（すなわち、図５の矢印Ａの方向）に移動させる。継目無鋼管１は、テーブル２ａ上を矢印Ａの方向へ移動し、第１搬送ロール群４ａに載置される。以下では、第１切断機３ａ側の継目無鋼管１の管端を先端、第２切断機３ｂ側の管端を後端と記す。 In the cutting step, first, the seamless steel pipe 1 is placed on the table 2 and moved in the direction perpendicular to the pipe axis direction (that is, the direction of arrow A in FIG. 5). The seamless steel pipe 1 moves on the table 2a in the direction of arrow A and is placed on the first transport roll group 4a. In the following, the pipe end of the seamless steel pipe 1 on the first cutting machine 3a side will be referred to as the tip end, and the pipe end on the second cutting machine 3b side will be referred to as the rear end.

次に、継目無鋼管１は、第１搬送ロール群４ａによって管軸方向（すなわち、図５の矢印Ｂの方向）に搬送されて、継目無鋼管１の先端が第１切断機３ａに装入される。第１切断機３ａは、継目無鋼管１の先端側のクロップを切断して除去し、さらに継目無鋼管１の先端側の面取り加工を行なう。その後、継目無鋼管１は、第１搬送ロール群４ａによって矢印Ｂの逆方向へ搬送されて、テーブル２ｂへ戻される。以下では、矢印Ｂの方向への搬送を前進搬送、矢印Ｂの逆方向への搬送を後退搬送と記す。 Next, the seamless steel pipe 1 is conveyed in the pipe axial direction (that is, the direction of arrow B in FIG. 5) by the first transfer roll group 4a, and the tip of the seamless steel pipe 1 is charged into the first cutting machine 3a. Will be done. The first cutting machine 3a cuts and removes the crop on the tip side of the seamless steel pipe 1, and further chamfers the tip side of the seamless steel pipe 1. After that, the seamless steel pipe 1 is conveyed in the direction opposite to the arrow B by the first conveying roll group 4a and returned to the table 2b. In the following, transport in the direction of arrow B will be referred to as forward transport, and transport in the opposite direction of arrow B will be referred to as reverse transport.

引き続き、継目無鋼管１は、テーブル２ｂ上を矢印Ａの方向へ移動し、第２搬送ロール群４ｂに載置される。次に、継目無鋼管１は、第２搬送ロール群４ｂによって矢印Ｂの逆方向へ後退搬送されて、継目無鋼管１の後端が第２切断機３ｂに装入される。第２切断機３ｂは、継目無鋼管１の後端側のクロップを切断して除去し、さらに継目無鋼管１の後端側の面取り加工を行なう。その後、継目無鋼管１は、第２搬送ロール群４ｂによって矢印Ｂの方向へ前進搬送されて、テーブル２ｃへ戻される。 Subsequently, the seamless steel pipe 1 moves on the table 2b in the direction of arrow A and is placed on the second transport roll group 4b. Next, the seamless steel pipe 1 is retracted by the second transport roll group 4b in the direction opposite to the arrow B, and the rear end of the seamless steel pipe 1 is charged into the second cutting machine 3b. The second cutting machine 3b cuts and removes the crop on the rear end side of the seamless steel pipe 1, and further chamfers the rear end side of the seamless steel pipe 1. After that, the seamless steel pipe 1 is forward-transported in the direction of arrow B by the second transport roll group 4b and returned to the table 2c.

このようにして、切断工程では、継目無鋼管の先端と後端のクロップを切断し、さらに面取り加工を行なう。 In this way, in the cutting step, the crops at the front end and the rear end of the seamless steel pipe are cut, and further chamfering is performed.

油井管あるいはラインパイプとして用いられる継目無鋼管（長さ１０〜１２ｍ程度）の場合、上記の手順で所定の長さを有する製品となる継目無鋼管が得られる。 In the case of a seamless steel pipe (length of about 10 to 12 m) used as an oil well pipe or a line pipe, a seamless steel pipe which is a product having a predetermined length can be obtained by the above procedure.

しかし、継目無鋼管の用途によっては、製品の長さが５ｍ程度のものがある。その場合には、上記の手順で得られた継目無鋼管を、さらに別の切断面取り設備へ運搬して、２分割する工程が必要となる。そのため、製品として所定の長さを有する継目無鋼管（以下、製品管という）を得るまでに長時間を要し、製品管の生産効率の低下を招く問題がある。 However, depending on the use of the seamless steel pipe, the length of the product may be about 5 m. In that case, a step of transporting the seamless steel pipe obtained in the above procedure to another cutting chamfering facility and dividing it into two is required. Therefore, it takes a long time to obtain a seamless steel pipe having a predetermined length as a product (hereinafter referred to as a product pipe), which causes a problem that the production efficiency of the product pipe is lowered.

特開２００２−３３７０１８号公報JP-A-2002-337018 特開２００１−２３９４１４号公報Japanese Unexamined Patent Publication No. 2001-239414

本発明はかかる問題点を解消し、所定の長さを有する２本の製品管を、１本の継目無鋼管から効率良く得ることが可能な、継目無鋼管の加工装置、継目無鋼管の切断方法および切断装置を提供することを目的とする。 The present invention solves such a problem and can efficiently obtain two product pipes having a predetermined length from one seamless steel pipe, a seamless steel pipe processing device, and cutting of a seamless steel pipe. It is an object of the present invention to provide a method and a cutting device.

本発明者は、１本の継目無鋼管から効率良く２本の製品管を得るために、図５に示すような、継目無鋼管の先端側のクロップを切断しかつ面取り加工を行なう第１切断機と、継目無鋼管の後端側のクロップを切断しかつ面取り加工を行なう第２切断機とを備えた切断装置を用いて、継目無鋼管を２分割する技術について検討した。その結果、第１切断機で先端側のクロップ切断と面取り加工を行ない、さらに、その第１切断機で１本目の製品管（以下、第１製品管という）を所定の長さに切り出した後、継目無鋼管の残部から第２切断機で２本目の製品管（以下、第２製品管という）を所定の長さに切断することによって、製品としての長さを有し、かつ両管端にそれぞれ面取り加工を施した２本の製品管を得ることが可能であるということを見出した。 The present inventor cuts the crop on the tip side of the seamless steel pipe and chams it as shown in FIG. 5 in order to efficiently obtain two product pipes from one seamless steel pipe. A technique for dividing a seamless steel pipe into two was examined using a cutting device equipped with a machine and a second cutting machine for cutting the crop on the rear end side of the seamless steel pipe and performing chamfering. As a result, the tip side is cropped and chamfered by the first cutting machine, and the first product tube (hereinafter referred to as the first product tube) is cut out to a predetermined length by the first cutting machine. By cutting the second product pipe (hereinafter referred to as the second product pipe) from the rest of the seamless steel pipe to a predetermined length with a second cutting machine, it has a length as a product and both pipe ends. It was found that it is possible to obtain two product pipes, each of which has been chamfered.

本発明は上記した知見に基づいてなされたものであり、以下を要旨とするものである。
［１］ 継目無鋼管を切断するとともに先端を加工する切断機と、
前記切断機の入側に設けた入側搬送ロール群と、
前記切断機の出側に設けた出側搬送ロール群と、
前記出側搬送ロール群の上方に配設された押えロールとを設け、
前記押えロールで上面を押さえて水平に保持した継目無鋼管を、前記入側搬送ロール群および前記出側搬送ロール群を用いて、前記切断機内を前進搬送あるいは後退搬送することを特徴とする継目無鋼管の加工装置。
［２］ 継目無鋼管を切断機内に進入させて切断し、所定の長さを有する第１および第２製品管を得る継目無鋼管の切断方法であって、
第１切断機の入側に配設された第１搬送ロール群により、継目無鋼管を前進搬送して前記第１切断機内に進入させ、前記第１切断機で前記継目無鋼管を所定の長さに切断して第１製品管と前記継目無鋼管の残部とし、
前記第１切断機の出側に配設された第３搬送ロール群により、前記第１製品管を前進搬送して前記第１切断機内から排出するとともに、前記第１切断機で前記継目無鋼管の残部の先端を加工し、
前記第１製品管に対しては、前記第３搬送ロール群の上方に配設された押えロールを下降させ、（１）式で算出される前記第１製品管の後端の変位量：Ｙ２（ｍｍ）が、（２）式を満たすように制御しながら、前記押えロールで前記第１製品管の上面を押えて前記第１製品管を水平に保持し、
前記第３搬送ロール群により前記第１製品管を後退搬送して前記第１搬送ロール群へ前記第１製品管を逆送させ、前記第１切断機内を通過させ、
前記第１製品管を第２搬送ロール群で後退搬送し、前記第１製品管の後端を第２切断機内に進入させて加工した後、前記第１製品管を前記第２搬送ロール群で前進搬送して次工程へ搬送し、
前記継目無鋼管の残部に対しては、前記第２搬送ロール群で前記第２切断機内に進入させて所定の長さに切断し、加工して第２製品管とし、
前記第２製品管を前記第２搬送ロール群で前進搬送して次工程へ搬送することを特徴とする継目無鋼管の切断方法。
Ｙ２＝（Ｘ２／Ｘ１）×Ｙ１ ・・・（１）
Ｃ≧Ｙ２≧−Ｃ ・・・（２）
Ｃ＝（ＤＣＵＴＴＥＲ−ＤＰＩＰＥ）／２ ・・・（３）
ここで、Ｘ１：第３搬送ロール群の基準ロールが製品管に当接する位置と製品管の先端との距離（ｍｍ）、
Ｘ２：第３搬送ロール群の基準ロールが製品管に当接する位置と製品管の後端との距離（ｍｍ）、
Ｙ１：押えロールが製品管を押し下げることにより生じる製品管の先端の変位量（ｍｍ）、
Ｙ２：押えロールが製品管を押し下げることにより生じる製品管の後端の変位量（ｍｍ）、
Ｃ：切断機の内部の回転体と製品管との隙間（ｍｍ）、
ＤＣＵＴＴＥＲ：切断機の内部の回転体の内径（ｍｍ）、
ＤＰＩＰＥ：製品管の外径（ｍｍ）、とする。
［３］ 前記押えロールを下降させる際、前記第１製品管の先端の変位量：Ｙ１（ｍｍ）が（４）式を満たすように制御することを特徴とする［２］に記載の継目無鋼管の切断方法。
Ｃ×（Ｘ１／Ｘ２） ≧ Ｙ１ ≧ −Ｃ×（Ｘ１／Ｘ２） ・・・（４）
［４］ 前記押えロールを下降させる際、前記第３搬送ロール群の基準ロールが前記第１製品管に当接する位置と前記第１製品管の先端との距離：Ｘ１（ｍｍ）が（５）式を満たすように制御することを特徴とする［２］に記載の継目無鋼管の切断方法。
１／Ｃ×（Ｘ２×Ｙ１） ≧ Ｘ１ ≧ −１／Ｃ×（Ｘ２×Ｙ１） ・・・（５）
［５］ 前記第３搬送ロール群により前記第１製品管を搬送する際、前記第３搬送ロール群を前記第１切断機に接近させ、あるいは前記第１切断機に離反させる往復運動を行うことを特徴とする［２］〜［４］のいずれかに記載の継目無鋼管の切断方法。
［６］ 継目無鋼管から所定の長さを有する製品管を得る継目無鋼管の切断装置であって、
継目無鋼管を切断し、面取り加工をする第１切断機および第２切断機と、
前記第１切断機の入側に配設され、前記継目無鋼管を前進搬送して前記第１切断機内に進入させる第１搬送ロール群と、
前記第１切断機の出側に配設され、得られた第１製品管を前進搬送して前記第１切断機の出側に排出させ、あるいは該第１製品管を後退搬送して前記第１切断機の入側へ逆送させる第３搬送ロール群と、
前記第３搬送ロール群の上方に配設される押えロールと、
前記第１製品管あるいは前記継目無鋼管の残部を前記第２切断機内に進入させる第２搬送ロール群と、を有することを特徴とする継目無鋼管の切断装置。
［７］ 前記第３搬送ロール群は、前記第１切断機に対して接近し、離反する往復運動を行うことを特徴とする請求項６に記載の継目無鋼管の切断装置。 The present invention has been made based on the above findings, and has the following gist.
[1] A cutting machine that cuts seamless steel pipes and processes the tip,
The entry side transport roll group provided on the entry side of the cutting machine and
The output side transport roll group provided on the output side of the cutting machine and
A presser roll arranged above the output side transport roll group is provided.
A seamless steel pipe whose upper surface is pressed by the holding roll and held horizontally is conveyed forward or backward in the cutting machine by using the inlet side transport roll group and the outlet side transport roll group. Steel pipe processing equipment.
[2] A method for cutting a seamless steel pipe, which is a method of cutting a seamless steel pipe by inserting it into a cutting machine and cutting it to obtain first and second product pipes having a predetermined length.
The seamless steel pipe is forwardly conveyed by the first transport roll group arranged on the entry side of the first cutting machine to enter the first cutting machine, and the seamless steel pipe is brought into the first cutting machine by the first cutting machine to a predetermined length. Cut it into the remaining part of the first product pipe and the seamless steel pipe.
The first product pipe is forwardly conveyed by the third transport roll group arranged on the outlet side of the first cutting machine and discharged from the inside of the first cutting machine, and the seamless steel pipe is discharged by the first cutting machine. Process the tip of the rest of the
With respect to the first product pipe, the holding roll arranged above the third transport roll group is lowered, and the displacement amount of the rear end of the first product pipe calculated by the equation (1): Y. While controlling so that 2 (mm) satisfies the equation (2), the presser roll presses the upper surface of the first product tube to hold the first product tube horizontally.
The first product pipe is retracted by the third transport roll group, the first product pipe is back-fed to the first transport roll group, and the first product pipe is passed through the first cutting machine.
The first product pipe is retracted by the second transport roll group, the rear end of the first product pipe is inserted into the second cutting machine for processing, and then the first product pipe is transported by the second transport roll group. Forward transport, transport to the next process,
The remaining portion of the seamless steel pipe is made into the second cutting machine by the second transport roll group, cut to a predetermined length, and processed into a second product pipe.
A method for cutting a seamless steel pipe, which comprises transporting the second product pipe forward with the second transport roll group and transporting the second product pipe to the next process.
Y 2 = (X 2 / X 1 ) x Y 1 ... (1)
C ≧ Y 2 ≧ −C ・ ・ ・ (2)
C = (D CUTTER −D PIPE ) / 2 ・ ・ ・ (3)
Here, X 1 : the distance (mm) between the position where the reference roll of the third transport roll group abuts on the product pipe and the tip of the product pipe,
X 2 : Distance (mm) between the position where the reference roll of the third transport roll group abuts on the product pipe and the rear end of the product pipe.
Y 1 : Displacement amount (mm) at the tip of the product tube caused by the presser roll pushing down the product tube,
Y 2 : Displacement amount (mm) at the rear end of the product tube caused by the presser roll pushing down the product tube,
C: Gap (mm) between the rotating body inside the cutting machine and the product tube,
D CUTTER : Inner diameter (mm) of the rotating body inside the cutting machine,
D PIPE : The outer diameter (mm) of the product tube.
[3] The seam according to [2], wherein when the presser roll is lowered, the displacement amount of the tip of the first product pipe: Y 1 (mm) is controlled so as to satisfy the equation (4). How to cut steel pipe.
C × (X 1 / X 2 ) ≧ Y 1 ≧ −C × (X 1 / X 2 ) ・ ・ ・ (4)
[4] When lowering the holding roll, the distance between the position where the reference roll of the third transport roll group comes into contact with the first product pipe and the tip of the first product pipe: X 1 (mm) is (5). ) The seamless steel pipe cutting method according to [2], which is controlled so as to satisfy the equation.
1 / C × (X 2 × Y 1 ) ≧ X 1 ≧ -1 / C × (X 2 × Y 1 ) ・ ・ ・ (5)
[5] When transporting the first product pipe by the third transport roll group, a reciprocating motion is performed to bring the third transport roll group closer to the first cutting machine or to separate from the first cutting machine. The method for cutting a seamless steel pipe according to any one of [2] to [4].
[6] A seamless steel pipe cutting device for obtaining a product pipe having a predetermined length from a seamless steel pipe.
The first cutting machine and the second cutting machine that cut the seamless steel pipe and chamfer it,
A first transport roll group, which is arranged on the entry side of the first cutting machine and forward transports the seamless steel pipe to enter the first cutting machine.
The first product pipe, which is arranged on the outlet side of the first cutting machine, is forward-conveyed and discharged to the outlet side of the first cutting machine, or the first product pipe is retracted and transported to the first product pipe. 1 Third transport roll group to be fed back to the entry side of the cutting machine,
A presser roll arranged above the third transport roll group and
A seamless steel pipe cutting device comprising a second transport roll group for allowing the remaining portion of the first product pipe or the seamless steel pipe to enter the second cutting machine.
[7] The seamless steel pipe cutting device according to claim 6, wherein the third transport roll group performs a reciprocating motion of approaching and separating from the first cutting machine.

本発明によれば、所定の長さを有する２本の製品管を、１本の継目無鋼管から効率良く得ることが可能な継目無鋼管の加工装置、継目無鋼管の切断方法および切断装置を提供することができる。これにより、１本の継目無鋼管を２分割するために、継目無鋼管を別の切断面取り設備へ搬送する必要がないので、製品管の生産効率の向上に大きく寄与し、産業上格段の効果を奏する。 According to the present invention, a seamless steel pipe processing device, a seamless steel pipe cutting method, and a cutting device capable of efficiently obtaining two product pipes having a predetermined length from one seamless steel pipe. Can be provided. As a result, since it is not necessary to transport the seamless steel pipe to another cutting chamfering facility in order to divide one seamless steel pipe into two, it greatly contributes to the improvement of the production efficiency of the product pipe, which is a remarkable industrial effect. Play.

図１は、本発明の継目無鋼管の切断装置の一例を模式的に示す平面図である。FIG. 1 is a plan view schematically showing an example of a seamless steel pipe cutting device of the present invention. 図２は、本発明を適用する切断装置の第１切断機における、継目無鋼管の切断方法の一例を模式的に示す側面図である。FIG. 2 is a side view schematically showing an example of a method for cutting a seamless steel pipe in a first cutting machine of a cutting device to which the present invention is applied. 図３は、本発明の押えロールと搬送ロールと第１製品管の関係の一例を説明する側面図である。FIG. 3 is a side view illustrating an example of the relationship between the presser roll, the transport roll, and the first product pipe of the present invention. 図４は、本発明を適用する切断装置の第１切断機における、継目無鋼管の切断方法の他の一例を模式的に示す側面図である。FIG. 4 is a side view schematically showing another example of a method for cutting a seamless steel pipe in the first cutting machine of the cutting device to which the present invention is applied. 図５は、従来の継目無鋼管の切断装置の例を模式的に示す平面図である。FIG. 5 is a plan view schematically showing an example of a conventional seamless steel pipe cutting device.

以下、本発明の継目無鋼管の加工装置、継目無鋼管の切断装置、およびその切断装置を用いた継目無鋼管の切断方法について詳細に説明する。なお、この本発明はこの実施形態に限定されない。 Hereinafter, a seamless steel pipe processing apparatus, a seamless steel pipe cutting apparatus, and a method for cutting the seamless steel pipe using the seamless steel pipe cutting apparatus of the present invention will be described in detail. The present invention is not limited to this embodiment.

まず、本発明の継目無鋼管の加工装置は、継目無鋼管を切断するとともに先端を加工する切断機と、切断機の入側に設けた入側搬送ロール群と、切断機の出側に設けた出側搬送ロール群と、出側搬送ロール群の上方に配設された押えロールとを設ける。そして、本発明の継目無鋼管の加工装置は、押えロールで継目無鋼管の上面を押さえて水平に保持し、水平に保持された継目無鋼管を、入側搬送ロール群と出側搬送ロール群の少なくとも１つを用いて、切断機内を前進搬送あるいは後退搬送するものである。なお、後述する本発明の切断装置１０は、この加工装置を一部に備える。すなわち、加工装置の切断機が後述の切断装置１０の第１切断機３ａであり、加工装置の入側搬送ロール群が後述の切断装置１０の第１搬送ロール群４ａであり、加工装置の出側搬送ロール群が後述の切断装置１０の第３搬送ロール群４ｃであり、加工装置の押えロールが後述の切断装置１０の押えロール５に対応する。そのため、加工装置の各構成要素の説明はここでは省略する。 First, the seamless steel pipe processing apparatus of the present invention is provided with a cutting machine for cutting the seamless steel pipe and processing the tip, an inlet transport roll group provided on the inlet side of the cutting machine, and an outlet side of the cutting machine. A set of out-side transport rolls and a presser roll arranged above the out-side transport roll group are provided. Then, in the seamless steel pipe processing apparatus of the present invention, the upper surface of the seamless steel pipe is pressed by a presser roll and held horizontally, and the horizontally held seamless steel pipe is held in the inlet side transport roll group and the outlet side transport roll group. At least one of the above is used to carry forward or backward in the cutting machine. The cutting device 10 of the present invention, which will be described later, includes this processing device in part. That is, the cutting machine of the processing device is the first cutting machine 3a of the cutting device 10 described later, and the inlet side transfer roll group of the processing device is the first transfer roll group 4a of the cutting device 10 described later. The side transport roll group is the third transport roll group 4c of the cutting device 10 described later, and the presser roll of the processing device corresponds to the presser roll 5 of the cutting device 10 described later. Therefore, the description of each component of the processing apparatus will be omitted here.

次に、本発明の継目無鋼管の切断装置１０（以下、切断装置と称する場合もある）について説明する。図１は、本発明に用いる継目無鋼管の切断装置の概略構成を例示する図である。ここでは、図５に示す切断装置における第１切断機３ａに、上述の加工装置を適用する場合を例に説明する。すなわち、本発明を適用する切断機は、図５に示す第１切断機の出側に第３搬送ロール群４ｃと押えロール５とを配設したものであり、その一例を模式的に図１に示す。なお、図５と同じ構成については、図５と同じ符号を付している。 Next, the seamless steel pipe cutting device 10 of the present invention (hereinafter, may be referred to as a cutting device) will be described. FIG. 1 is a diagram illustrating a schematic configuration of a seamless steel pipe cutting device used in the present invention. Here, a case where the above-mentioned processing apparatus is applied to the first cutting machine 3a in the cutting apparatus shown in FIG. 5 will be described as an example. That is, the cutting machine to which the present invention is applied has a third transport roll group 4c and a pressing roll 5 arranged on the exit side of the first cutting machine shown in FIG. 5, and an example thereof is schematically shown in FIG. Shown in. The same configurations as those in FIG. 5 are designated by the same reference numerals as those in FIG.

図１に示すように、本発明の切断装置１０は、テーブル２、第１切断機３ａ、第２切断機３ｂ、第１搬送ロール群４ａ、第２搬送ロール群４ｂ、第３搬送ロール群４ｃ、押えロール５を有する。 As shown in FIG. 1, the cutting device 10 of the present invention includes a table 2, a first cutting machine 3a, a second cutting machine 3b, a first transfer roll group 4a, a second transfer roll group 4b, and a third transfer roll group 4c. , Has a presser roll 5.

テーブル２は、搬送される継目無鋼管１を載置し、管軸方向に垂直な方向（図中の矢印Ａ）に移動させるための台である。 The table 2 is a table on which the seamless steel pipe 1 to be conveyed is placed and moved in a direction perpendicular to the pipe axis direction (arrow A in the drawing).

第１切断機３ａ、第２切断機３ｂは、継目無鋼管１の先端および後端におけるクロップの切断と面取加工を行う。また、第１切断機３ａは、１本の継目無鋼管を所定の長さに切断することも行う。第１切断機３ａと第２切断機３ｂは、管軸方向に対してテーブル２の両側に配設される。 The first cutting machine 3a and the second cutting machine 3b cut and chamfer the crops at the front end and the rear end of the seamless steel pipe 1. The first cutting machine 3a also cuts one seamless steel pipe to a predetermined length. The first cutting machine 3a and the second cutting machine 3b are arranged on both sides of the table 2 with respect to the pipe axis direction.

第１搬送ロール群４ａ、第２搬送ロール群４ｂ、第３搬送ロール群４ｃは、継目無鋼管１を前進搬送、後退搬送するためのロール群である。なお、ここでは、各搬送ロール群は４本のロールで構成される。 The first transfer roll group 4a, the second transfer roll group 4b, and the third transfer roll group 4c are roll groups for advancing and retreating the seamless steel pipe 1. Here, each transport roll group is composed of four rolls.

押えロール５は、第３搬送ロール群４ｃの上方に配設される。押えロール５は、必要に応じて、継目無鋼管を切断して得られる製品管の上面に当接させて上から押える役割を有する。例えば、押えロール５は、Ｖ形ロールであり、押えロールの幅は最小径パイプよりも大きく、押えロールの外径は最小径パイプより大きく最大径パイプよりも小さい。 The presser roll 5 is arranged above the third transport roll group 4c. The presser roll 5 has a role of contacting the upper surface of the product pipe obtained by cutting the seamless steel pipe and pressing the presser roll 5 from above, if necessary. For example, the presser roll 5 is a V-shaped roll, the width of the presser roll is larger than that of the minimum diameter pipe, and the outer diameter of the presser roll is larger than that of the minimum diameter pipe and smaller than that of the maximum diameter pipe.

本発明の切断装置１０によれば、後述する図２〜図４で説明する切断方法により、継目無鋼管を別の切断面取り設備へ搬送することなく、１本の継目無鋼管から所定の長さを有する２本の製品管を効率よく得ることができる。 According to the cutting device 10 of the present invention, the length from one seamless steel pipe to a predetermined length is determined by the cutting method described with reference to FIGS. 2 to 4 without transporting the seamless steel pipe to another cutting chamfering facility. It is possible to efficiently obtain two product pipes having the above.

次に、図２〜４を用いて、本発明の継目無鋼管の切断方法について説明する。 Next, the method for cutting the seamless steel pipe of the present invention will be described with reference to FIGS. 2 to 4.

本発明における継目無鋼管の切断処理を実行する際の、図１に示した切断装置１０の動作について説明する。本発明の継目無鋼管の切断処理は、継目無鋼管の切断、クロップ切断、面取り加工をするための第１切断機３ａ、第２切断機３ｂを用い、１本の継目無鋼管１（以下、鋼管と称する場合もある）をテーブル２と第１〜第３搬送ロール群４ａ、４ｂ、４ｃを介して各切断機に移動させて、鋼管の先端、後端のクロップ切断、面取り加工を行い、さらに所定の切断位置で切断し、２つの製品管を得る処理方法である。 The operation of the cutting device 10 shown in FIG. 1 when executing the cutting process of the seamless steel pipe in the present invention will be described. The seamless steel pipe cutting process of the present invention uses a first cutting machine 3a and a second cutting machine 3b for cutting, cropping, and chamfering the seamless steel pipe, and one seamless steel pipe 1 (hereinafter referred to as “seamless steel pipe 1”). (Sometimes referred to as a steel pipe) is moved to each cutting machine via the table 2 and the first to third transport roll groups 4a, 4b, and 4c, and the tip and rear ends of the steel pipe are cropped and chamfered. Further, it is a processing method of obtaining two product pipes by cutting at a predetermined cutting position.

図２は、図１に示す切断装置１０の第１切断機３ａにおける、継目無鋼管１の切断方法の一例を説明する側面図である。なお図２では、継目無鋼管１の切断と、それに伴う継目無鋼管１の動きを明確に示すために、第１切断機３ａの図示を省略している。その代わりに、第１切断機３ａの切断面取り工具の位置を切断位置６として２点鎖線で示す。 FIG. 2 is a side view illustrating an example of a method of cutting the seamless steel pipe 1 in the first cutting machine 3a of the cutting device 10 shown in FIG. In FIG. 2, the first cutting machine 3a is omitted in order to clearly show the cutting of the seamless steel pipe 1 and the accompanying movement of the seamless steel pipe 1. Instead, the position of the cutting chamfering tool of the first cutting machine 3a is indicated by a two-dot chain line as the cutting position 6.

図２を用いて、本発明の継目無鋼管の切断処理の一例を説明する。 An example of the cutting process of the seamless steel pipe of the present invention will be described with reference to FIG.

まず、図２（ａ）に示すように、継目無鋼管１を第１搬送ロール群４ａで管軸方向（すなわち矢印Ｂの方向）へ前進搬送し、第１切断装置の切断位置６にて先端側のクロップ１ａを切断して除去するとともに、継目無鋼管１の先端側の面取り加工を行なう。 First, as shown in FIG. 2A, the seamless steel pipe 1 is forward-conveyed by the first transport roll group 4a in the pipe axial direction (that is, the direction of arrow B), and the tip is transported at the cutting position 6 of the first cutting device. The crop 1a on the side is cut and removed, and the tip side of the seamless steel pipe 1 is chamfered.

次に、図２（ｂ）に示すように、継目無鋼管１を第１搬送ロール群４ａでさらに前進搬送して第１切断機に進入させる。継目無鋼管１は、所定の長さを確保した後、切断位置６にて切断することによって、所定の製品長さを有する第１製品管１ｂを得る。このとき、押えロール５は第１製品管１ｂに当接させても良いが、継目無鋼管１に表面疵（たとえばスリ疵、窪み等）が発生するのを防止する観点から、押えロール５は第１製品管１ｂに当接させずに、第３搬送ロール群４ｃの上方で待機させることが好ましい。 Next, as shown in FIG. 2B, the seamless steel pipe 1 is further forward-transported by the first transport roll group 4a to enter the first cutting machine. The seamless steel pipe 1 is cut at the cutting position 6 after securing a predetermined length to obtain a first product pipe 1b having a predetermined product length. At this time, the presser roll 5 may be brought into contact with the first product pipe 1b, but from the viewpoint of preventing surface flaws (for example, scratches, dents, etc.) from occurring in the seamless steel pipe 1, the presser roll 5 is used. It is preferable to stand by above the third transport roll group 4c without contacting the first product pipe 1b.

次に、図２（ｃ）に示すように、第１製品管１ｂを第３搬送ロール群４ｃでさらに前進搬送して、図示しない第１切断機３ａから排出させる。さらに、第１切断機は継目無鋼管１の残部（すなわち、後述の第２製品管１ｃと継目無鋼管後端側のクロップ１ｄが繋がった状態のもの）の先端側について、面取り加工を行なう。 Next, as shown in FIG. 2C, the first product pipe 1b is further forward-carried by the third transport roll group 4c and discharged from the first cutting machine 3a (not shown). Further, the first cutting machine chamfers the tip side of the remaining portion of the seamless steel pipe 1 (that is, the state in which the second product pipe 1c described later and the crop 1d on the rear end side of the seamless steel pipe are connected).

次に、図２（ｄ）に示すように、継目無鋼管１の残部を矢印Ｂの逆方向へ後退搬送する。さらに、図２（ｅ）に示すように、継目無鋼管１の残部は、図１に示すテーブル２を経て、第２搬送ロール群４ｂに載置される。なお図示は省略するが、載置された後、継目無鋼管１の残部は後退搬送して、継目無鋼管の後端部を第２切断機３ｂに装入する。そして、所定の製品長さに切り出し、後端側のクロップ１ｄを除去することによって第２製品管１ｃを得るとともに、第２製品管１ｃの後端側の面取り加工を行なう。なお、第２製品管１ｃの先端側は、図２（ｃ）において既に面取り加工が施されているので、第２切断機３ｂでは後端側の面取り加工のみを行なう。 Next, as shown in FIG. 2D, the remaining portion of the seamless steel pipe 1 is retracted and conveyed in the opposite direction of the arrow B. Further, as shown in FIG. 2E, the remaining portion of the seamless steel pipe 1 is placed on the second transport roll group 4b via the table 2 shown in FIG. Although not shown, the rest of the seamless steel pipe 1 is retracted and conveyed, and the rear end of the seamless steel pipe is charged into the second cutting machine 3b after being placed. Then, it is cut out to a predetermined product length and the crop 1d on the rear end side is removed to obtain the second product tube 1c, and the rear end side of the second product tube 1c is chamfered. Since the front end side of the second product tube 1c has already been chamfered in FIG. 2C, the second cutting machine 3b only chamfers the rear end side.

引き続き、図示は省略するが、第２製品管１ｃは、図１に示す第２搬送ロール群４ｂで矢印Ｂの方向へ前進搬送し、テーブル２に戻す。さらに、第２製品管１ｃを管軸方向に垂直な矢印Ａの方向へ移動させて、次工程（たとえば検査工程、印字工程等）へ送給する。 Subsequently, although not shown, the second product pipe 1c is forward-conveyed in the direction of arrow B by the second transport roll group 4b shown in FIG. 1 and returned to the table 2. Further, the second product tube 1c is moved in the direction of the arrow A perpendicular to the tube axis direction and fed to the next process (for example, inspection process, printing process, etc.).

一方、図２（ｆ）に示すように、第１製品管１ｂは、第３搬送ロール群４ｃで矢印Ｂの逆方向へ後退搬送し、第１切断機３ａ内を通過する。このとき、第１製品管１ｂの長さによっては、第１搬送ロール群４ａと第３搬送ロール群４ｃとの間（すなわち第１切断機の内部）で第１製品管１ｂの後端が落下するという問題が生じる場合がある。その理由は、第１切断機３ａの内部には搬送ロールを配設できないので、第１搬送ロール群４ａと第３搬送ロール群４ｃとのロール間隔が広くなっているためである。 On the other hand, as shown in FIG. 2 (f), the first product pipe 1b is retracted in the direction opposite to the arrow B by the third transport roll group 4c and passes through the first cutting machine 3a. At this time, depending on the length of the first product tube 1b, the rear end of the first product tube 1b falls between the first transfer roll group 4a and the third transfer roll group 4c (that is, inside the first cutting machine). May cause problems. The reason is that since the transfer roll cannot be arranged inside the first cutting machine 3a, the roll interval between the first transfer roll group 4a and the third transfer roll group 4c is wide.

一般に、第１切断機の内部には、切断面取り工具を装着して回転する構造体（以下、回転体と称する）が配設されている。そのため、第１製品管１ｂの後端が第１切断機の内部で落下すると、回転体に接触して設備故障を引き起こす原因となる。そこで、本発明では上記落下を防止するために、図２（ｆ）に示すように、押えロール５を第１製品管１ｂに当接させて上から押えることによって、第１製品管１ｂを水平姿勢に保ちながら第１搬送ロール群４ａと第３搬送ロール群４ｃとの間を後退搬送させている。 Generally, a structure (hereinafter, referred to as a rotating body) that rotates by mounting a cutting chamfering tool is arranged inside the first cutting machine. Therefore, if the rear end of the first product pipe 1b falls inside the first cutting machine, it may come into contact with the rotating body and cause equipment failure. Therefore, in the present invention, in order to prevent the above-mentioned fall, as shown in FIG. 2 (f), the presser roll 5 is brought into contact with the first product tube 1b and pressed from above to hold the first product tube 1b horizontally. While maintaining the posture, the first transfer roll group 4a and the third transfer roll group 4c are retracted and conveyed.

このように第１製品管１ｂの姿勢を制御することによって、第１製品管１ｂが第１切断機３ａの内部の回転体に接触することなく通過させることができる。 By controlling the posture of the first product pipe 1b in this way, the first product pipe 1b can be passed through without contacting the rotating body inside the first cutting machine 3a.

次ぎに、図示はしないが、第１切断機３ａを通過した第１製品管１ｂは、さらに第１搬送ロール群４ａで後退搬送し、テーブル２に戻し、第１製品管１ｂを管軸方向に垂直な矢印Ａの方向へ移動させて、第２搬送ロール群４ｂに載置する。そして、第１製品管１ｂは第２搬送ロール群４ｂにより後退搬送され、第１製品管１ｂの後端部を第２切断機３ｂに装入する。そして、第１製品管１ｂの後端側の面取り加工を行なう。なお、第１製品管１ｂの先端側は、既に面取り加工が施されているので、第２切断機３ｂでは後端側の面取り加工のみを行なう。 Next, although not shown, the first product pipe 1b that has passed through the first cutting machine 3a is further retracted by the first transport roll group 4a, returned to the table 2, and the first product pipe 1b is moved in the pipe axial direction. It is moved in the direction of the vertical arrow A and placed on the second transport roll group 4b. Then, the first product pipe 1b is retracted by the second transport roll group 4b, and the rear end portion of the first product pipe 1b is charged into the second cutting machine 3b. Then, the rear end side of the first product pipe 1b is chamfered. Since the tip end side of the first product tube 1b has already been chamfered, the second cutting machine 3b only chamfers the rear end side.

以上の切断方法により、１本の継目無鋼管から、所定の長さを有し、かつ両端に面取り加工を施した２本の製品管を得ることができる。しかも、従来技術のように継目無鋼管を別の切断面取り設備へ運搬する必要はないので、効率良く切断しかつ面取り加工を行なうことができる。 By the above cutting method, two product pipes having a predetermined length and chamfered at both ends can be obtained from one seamless steel pipe. Moreover, unlike the conventional technique, it is not necessary to transport the seamless steel pipe to another cutting and chamfering facility, so that cutting and chamfering can be performed efficiently.

ここで、図３を参照して、押えロール５による第１製品管１ｂの姿勢の制御について説明する。 Here, with reference to FIG. 3, the attitude control of the first product pipe 1b by the presser roll 5 will be described.

図３は、押えロール５と第３搬送ロール群４ｃを構成するロールとの配置関係を説明する側面図である。なお、図３には、第３搬送ロール群４ｃを構成するロールのうち、最も第１切断機３ａ（図示せず）の出側に近いロールのみを示している。 FIG. 3 is a side view for explaining the arrangement relationship between the pressing roll 5 and the rolls constituting the third transport roll group 4c. Note that FIG. 3 shows only the rolls closest to the exit side of the first cutting machine 3a (not shown) among the rolls constituting the third transport roll group 4c.

図３に示すように、第１切断機の出側に配設される搬送ロール群（すなわち、第３搬送ロール群４ｃ）を構成するロールのうち、第１切断機に最も近いロールが、第１製品管１ｂに当接する位置を基準とする。なお、以下、この位置を基準位置Ｐと称し、このロールを基準ロールと称する。ここでは、基準位置Ｐ（基準ロール）と第１製品管１ｂの先端との距離をＸ１（ｍｍ）、基準位置Ｐ（基準ロール）と第１製品管１ｂの後端との距離をＸ２（ｍｍ）とする。また、押えロール５が第１製品管１ｂを押し下げることによって生じる先端の変位量をＹ１（ｍｍ）、押えロール５が第１製品管１ｂを押し下げることによって生じる後端の変位量をＹ２（ｍｍ）とする。 As shown in FIG. 3, among the rolls constituting the transport roll group (that is, the third transport roll group 4c) arranged on the outlet side of the first cutting machine, the roll closest to the first cutting machine is the first. 1 The position of contact with the product tube 1b is used as a reference. Hereinafter, this position is referred to as a reference position P, and this roll is referred to as a reference roll. Here, the distance between the reference position P (reference roll) and the tip of the first product tube 1b is X 1 (mm), and the distance between the reference position P (reference roll) and the rear end of the first product tube 1b is X 2. Let it be (mm). Further, the displacement amount of the tip caused by the pressing roll 5 pushing down the first product tube 1b is Y 1 (mm), and the displacement amount of the rear end caused by the pressing roll 5 pushing down the first product tube 1b is Y 2 ( mm).

本発明によれば、第１製品管１ｂを水平姿勢に保ちながら第１搬送ロール群４ａと第３搬送ロール群４ｃとの間、すなわち第１切断機３ａとの間を後退搬送することができる。この場合、下記の（１）式で算出される第１製品管１ｂの後端の変位量Ｙ２（ｍｍ）は、下記の（２）式を満たすように制御しながら後退搬送される。なお、変位量とは、上述の制御の誤差によって生じる第１製品管１ｂの水平姿勢からのズレを指す。
Ｙ２＝（Ｘ２／Ｘ１）×Ｙ１ ・・・（１）
Ｃ≧Ｙ２≧−Ｃ ・・・（２）
上記の（２）式において、Ｃは、第１切断機３ａの内部の回転体と第１製品管１ｂとの隙間（いわゆるクリアランス）を意味する。このＣは、第１切断機３ａの内部の回転体の内径ＤＣＵＴＴＥＲ（ｍｍ）と第１製品管１ｂの外径ＤＰＩＰＥ（ｍｍ）とを用いて表すことができ、下記の（３）式により算出される値である。
Ｃ＝（ＤＣＵＴＴＥＲ−ＤＰＩＰＥ）／２ ・・・（３）
上記の（２）式におけるＣ≧Ｙ２は、図３のように第１製品管１ｂの後端が水平よりも上昇する場合を示す。一方、上記の（２）式におけるＹ２≧−Ｃは、第１製品管１ｂの後端が水平よりも下降する場合を示す。 According to the present invention, the first product pipe 1b can be retracted between the first transport roll group 4a and the third transport roll group 4c, that is, between the first cutting machine 3a while maintaining the horizontal posture. .. In this case, the displacement amount Y 2 (mm) of the rear end of the first product pipe 1b calculated by the following equation (1) is retracted while being controlled so as to satisfy the following equation (2). The displacement amount refers to the displacement of the first product pipe 1b from the horizontal posture caused by the above-mentioned control error.
Y 2 = (X 2 / X 1 ) x Y 1 ... (1)
C ≧ Y 2 ≧ −C ・ ・ ・ (2)
In the above equation (2), C means a gap (so-called clearance) between the rotating body inside the first cutting machine 3a and the first product pipe 1b. This C can be expressed by using the inner diameter D CUTTER (mm) of the rotating body inside the first cutting machine 3a and the outer diameter D PIPE (mm) of the first product tube 1b, and can be expressed by the following equation (3). It is a value calculated by.
C = (D CUTTER −D PIPE ) / 2 ・ ・ ・ (3)
C ≧ Y 2 in the above equation (2) indicates a case where the rear end of the first product pipe 1b rises above the horizontal as shown in FIG. On the other hand, Y 2 ≧ −C in the above equation (2) indicates a case where the rear end of the first product pipe 1b is lowered below the horizontal.

なお、押えロール５を下降させる際、第１製品管先端の変位量：Ｙ１（ｍｍ）が、下記の（４）式を満たすように制御することで、第１製品管１ｂの水平姿勢を保つことも可能である。
Ｃ×（Ｘ１／Ｘ２） ≧ Ｙ１ ≧ −Ｃ×（Ｘ１／Ｘ２） ・・・（４）
あるいは、押えロール５を下降させる際、基準位置Ｐとの距離：Ｘ１（ｍｍ）が、下記の（５）式を満たすように制御することで、第１製品管１ｂの水平姿勢を保つことも可能である。
１／Ｃ×（Ｘ２×Ｙ１） ≧ Ｘ１ ≧ −１／Ｃ×（Ｘ２×Ｙ１） ・・・（５）
これらの制御の場合でも、本発明の効果は同様に得られる。 When the presser roll 5 is lowered, the displacement amount of the tip of the first product pipe: Y 1 (mm) is controlled so as to satisfy the following equation (4), so that the horizontal posture of the first product pipe 1b can be adjusted. It is also possible to keep.
C × (X 1 / X 2 ) ≧ Y 1 ≧ −C × (X 1 / X 2 ) ・ ・ ・ (4)
Alternatively, when the presser roll 5 is lowered, the distance from the reference position P: X 1 (mm) is controlled so as to satisfy the following equation (5) to maintain the horizontal posture of the first product pipe 1b. Is also possible.
1 / C × (X 2 × Y 1 ) ≧ X 1 ≧ -1 / C × (X 2 × Y 1 ) ・ ・ ・ (5)
Even in the case of these controls, the effects of the present invention can be obtained as well.

なお、継目無鋼管１の先端側のクロップ１ａを取り除く機構（第１切断機３ａ）が、図２（ａ）に示した切断位置６と第３搬送ロール群４ｃとの間に配設される場合は、図４に示すように、第３搬送ロール群４ｃが第１切断機３ａ（図示せず）に対して接近および離反の往復運動を可能とするように設置することが好ましい。 A mechanism for removing the crop 1a on the tip side of the seamless steel pipe 1 (first cutting machine 3a) is arranged between the cutting position 6 shown in FIG. 2A and the third transfer roll group 4c. In this case, as shown in FIG. 4, it is preferable to install the third transport roll group 4c so as to enable reciprocating motion of approaching and separating from the first cutting machine 3a (not shown).

以下、図４を用いて、本発明を適用する切断装置の継目無鋼管の切断方法の他の一例、すなわち第３搬送ロール群４ｃが第１切断機に対して往復運動をする切断装置を用いた継目無鋼管の切断方法について説明する。なお、図２の同じものについては同じ符号を付与する。また、図４の切断処理は、基本的には図２の切断処理と同様の処理を行うため、図２の切断処理異なる部分については詳細に説明する。 Hereinafter, using FIG. 4, another example of a method for cutting a seamless steel pipe of a cutting device to which the present invention is applied, that is, a cutting device in which the third transfer roll group 4c reciprocates with respect to the first cutting machine is used. The method of cutting the seamless steel pipe will be described. The same reference numerals are given to the same ones in FIG. Further, since the cutting process of FIG. 4 is basically the same as the cutting process of FIG. 2, the parts different from the cutting process of FIG. 2 will be described in detail.

まず、図４（ａ）に示すように、図示しない第１切断機３ａの切断位置６にて継目無鋼管１の先端側のクロップ１ａを切断する場合、第３搬送ロール群４ｃは移動され、第１切断機から離しておく（離反させる）ことが好ましい。第１切断機から離反させる理由は、クロップ１ａを払出すシュートを設け、そのシュートにクロップを落とすスペースを確保するためである。 First, as shown in FIG. 4A, when the crop 1a on the tip side of the seamless steel pipe 1 is cut at the cutting position 6 of the first cutting machine 3a (not shown), the third transport roll group 4c is moved. It is preferable to keep it away from the first cutting machine (separate it). The reason for separating from the first cutting machine is to provide a chute for paying out the crop 1a and to secure a space for dropping the crop on the chute.

次に、図４（ｂ）に示すように、第１搬送ロール群４ａで前進搬送して第１切断機内に進入させ、切断位置６で切断し、第１製品管１ｂを得る。このとき押えロール５は上方で待機することが好ましい。 Next, as shown in FIG. 4B, the first transport roll group 4a is forward-conveyed to enter the first cutting machine, and the first product tube 1b is obtained by cutting at the cutting position 6. At this time, it is preferable that the presser roll 5 waits upward.

次に、図４（ｃ）に示すように、第１製品管１ｂを第３搬送ロール群４ｃで前進搬送して第１切断機から排出する。第１切断機で継目無鋼管の残部の先端の面取り加工を行う。 Next, as shown in FIG. 4C, the first product pipe 1b is forward-conveyed by the third transport roll group 4c and discharged from the first cutting machine. The first cutting machine chamfers the tip of the remaining part of the seamless steel pipe.

次に、図４２（ｄ）に示すように、継目無鋼管１の残部を矢印Ｂの逆方向へ後退搬送して第１切断機から排出した後、図２（ｅ）に示すように、第３搬送ロール群４ｃを移動させて、第１切断機に近づける（接近させる）ことが好ましい。第１切断機に接近させる理由は、図４に示す第１搬送ロール群４ａとの距離を縮め、鋼管の片持ち部分を減らすためである。 Next, as shown in FIG. 42 (d), the remaining portion of the seamless steel pipe 1 is retracted and conveyed in the opposite direction of the arrow B and discharged from the first cutting machine, and then, as shown in FIG. 2 (e), the second 3 It is preferable to move the transport roll group 4c so that it approaches (approaches) the first cutting machine. The reason for approaching the first cutting machine is to shorten the distance from the first transport roll group 4a shown in FIG. 4 and reduce the cantilevered portion of the steel pipe.

さらに、図４（ｅ）に示すように、継目無鋼管１の残部は、テーブル２を経て第２搬送ロール群４ｂに載置されたのち後退搬送され、後端部を第２切断機３ｂに装入して切断、クロップ１ｄの除去がされる。そして、得られた第２製品管１ｃの後端側は面取り加工される。そして、第２製品管１ｃは、第２搬送ロール群４ｂで前進搬送され、テーブル２を経て、次工程（たとえば検査工程、印字工程等）へ送給される。 Further, as shown in FIG. 4E, the remaining portion of the seamless steel pipe 1 is placed on the second transport roll group 4b via the table 2 and then retracted and transported, and the rear end portion is transferred to the second cutting machine 3b. It is charged, cut, and the crop 1d is removed. Then, the rear end side of the obtained second product pipe 1c is chamfered. Then, the second product pipe 1c is forward-conveyed by the second transfer roll group 4b, and is fed to the next process (for example, inspection process, printing process, etc.) via the table 2.

次に、図４（ｆ）に示すように、第１製品管１ｂは、押えロール５を第１製品管１ｂに当接させて上から押えることによって、水平姿勢を保ちながら、第１搬送ロール群４ａと第３搬送ロール群４ｃとの間を後退搬送される。 Next, as shown in FIG. 4 (f), the first product tube 1b is a first transport roll while maintaining a horizontal posture by bringing the presser roll 5 into contact with the first product tube 1b and pressing it from above. It is retracted between the group 4a and the third transport roll group 4c.

次ぎに、図示はしないが、第１製品管１ｂは、第１搬送ロール群４ａで後退搬送され、テーブル２を経て、第２搬送ロール群４ｂにより後退搬送され、後端部を第２切断機３ｂに装入し、後端側の面取り加工を行なう。 Next, although not shown, the first product pipe 1b is retracted and conveyed by the first conveying roll group 4a, passed through the table 2, and is retracted and conveyed by the second conveying roll group 4b, and the rear end is cut by the second cutting machine. It is charged into 3b and chamfered on the rear end side.

以上より、本発明によれば、製品管を水平状態に保持しながら切断機の内部の回転体に接触させることなく回収できるので、所定の長さを有する２本の製品管を、１本の継目無鋼管から効率良く得ることができる。また、製品管を切断機の出側に排出した後に後退搬送して切断機の入側へ逆送できるので、効率良く切断しかつ面取り加工をすることが可能となる。これにより、１本の継目無鋼管を２分割するために、継目無鋼管を別の切断面取り設備へ搬送する必要がないので、製品管の生産効率の向上に繋がる。 From the above, according to the present invention, since the product pipe can be collected without contacting the rotating body inside the cutting machine while keeping the product pipe in a horizontal state, two product pipes having a predetermined length can be collected as one. It can be efficiently obtained from a seamless steel pipe. Further, since the product tube can be discharged to the outlet side of the cutting machine, then retracted and conveyed back to the entry side of the cutting machine, it is possible to efficiently cut and chamfer the product tube. As a result, since it is not necessary to transport the seamless steel pipe to another cutting chamfering facility in order to divide one seamless steel pipe into two, it leads to improvement in the production efficiency of the product pipe.

図４に示す切断装置の第１切断機に、図１に示すように第３搬送ロールと押えロールを配設した切断装置を用いて、所定の長さ（１０〜１２ｍ程度）を有する１００本の継目無鋼管（外径４３２ｍｍ）から、各々２本ずつ、５ｍ程度の製品管を得るための操業を行なった。なお、ここでは第１切断機の回転体の内径が４６０ｍｍのものを用い、上記した（２）式においてＣ＝１４ｍｍであり、上記の（１）式で算出される第１製品管の後端の変位量：Ｙ２（ｍｍ）が上記（２）式を満たすように押えロールを制御した。これを本発明例１とする。 Using a cutting device in which a third transport roll and a holding roll are arranged as shown in FIG. 1 in the first cutting machine of the cutting device shown in FIG. 4, 100 pieces having a predetermined length (about 10 to 12 m) are used. An operation was carried out to obtain two product pipes of about 5 m from each of the seamless steel pipes (outer diameter 432 mm). Here, the rotating body of the first cutting machine having an inner diameter of 460 mm is used, C = 14 mm in the above formula (2), and the rear end of the first product pipe calculated by the above formula (1). The holding roll was controlled so that the displacement amount of Y 2 (mm) satisfied the above equation (2). This is referred to as Example 1 of the present invention.

また、図４に示す切断装置の第１切断機に、図１に示すように第３搬送ロールと押えロールを配設した切断装置を用いて、所定の長さ（１０〜１２ｍ程度）を有する１００本の継目無鋼管（外径４３２ｍｍ）から、各々２本ずつ、５ｍ程度の製品管を得るための操業を行なった。なお、第３搬送ロールは、図４に示すように、水平方向に移動可能に設置した。ここでは、第１切断機の回転体の内径が４６０ｍｍのものを用い、上記した（２）式におけるＣは本発明例１と同様にＣ＝１４ｍｍとし、上記の（１）式で算出される第１製品管の後端の変位量：Ｙ２（ｍｍ）が上記（２）式を満たすように押えロールを制御した。これを本発明例２とする。 Further, the first cutting machine of the cutting device shown in FIG. 4 has a predetermined length (about 10 to 12 m) by using a cutting device in which a third transport roll and a holding roll are arranged as shown in FIG. An operation was carried out to obtain a product pipe of about 5 m from 100 seamless steel pipes (outer diameter 432 mm), two each. As shown in FIG. 4, the third transport roll was installed so as to be movable in the horizontal direction. Here, a rotating body of the first cutting machine having an inner diameter of 460 mm is used, and C in the above equation (2) is calculated by the above equation (1) with C = 14 mm as in Example 1 of the present invention. The holding roll was controlled so that the displacement amount of the rear end of the first product pipe: Y 2 (mm) satisfied the above equation (2). This is referred to as Example 2 of the present invention.

このようにして本発明を適用して切断装置を操業した結果、本発明例１、２のいずれも支障なく製品管が得られた。 As a result of operating the cutting device by applying the present invention in this way, product tubes were obtained without any trouble in any of Examples 1 and 2 of the present invention.

なお、押えロールを下降させる際、押えロールが第１製品管を押し下げることによって生じる製品管先端の変位量：Ｙ１（ｍｍ）が上記の（４）式を満たさなかったものについては、製品管が第１切断機の回転体と接触し、製品管にスリキズが生じた。 When the presser roll is lowered, the displacement amount of the tip of the product tube caused by the presser roll pushing down the first product tube: Y 1 (mm) does not satisfy the above equation (4), the product tube is used. Contacted the rotating body of the first cutting machine, and the product tube was scratched.

１ 継目無鋼管
１ａ 先端側のクロップ
１ｂ 第１製品管
１ｃ 第２製品管
１ｄ 後端側のクロップ
２ テーブル
３ａ 第１切断機
３ｂ 第２切断機
４ａ 第１搬送ロール群
４ｂ 第２搬送ロール群
４ｃ 第３搬送ロール群
５ 押えロール
６ 切断位置 1 Seamless steel pipe 1a Tip side crop 1b 1st product pipe 1c 2nd product pipe 1d Rear end side crop 2 Table 3a 1st cutting machine 3b 2nd cutting machine 4a 1st transport roll group 4b 2nd transport roll group 4c 3rd transport roll group 5 Presser roll 6 Cutting position

Claims (2)

継目無鋼管から所定の長さを有する製品管を得る継目無鋼管の切断装置であって、
継目無鋼管を切断し、面取り加工をする第１切断機および第２切断機と、
前記第１切断機の入側に配設され、前記継目無鋼管を前進搬送して前記第１切断機内に進入させる第１搬送ロール群と、
前記第１切断機の出側に配設され、得られた第１製品管を前進搬送して前記第１切断機の出側に排出させ、あるいは該第１製品管を後退搬送して前記第１切断機の入側へ逆送させる第３搬送ロール群と、
前記第３搬送ロール群の上方に配設される押えロールと、
前記第１製品管あるいは前記継目無鋼管の残部を前記第２切断機内に進入させる第２搬送ロール群と、を有することを特徴とする継目無鋼管の切断装置。 A seamless steel pipe cutting device that obtains a product pipe having a predetermined length from a seamless steel pipe.
The first cutting machine and the second cutting machine that cut the seamless steel pipe and chamfer it,
A first transport roll group, which is arranged on the entry side of the first cutting machine and forward transports the seamless steel pipe to enter the first cutting machine.
The first product pipe, which is arranged on the outlet side of the first cutting machine, is forward-conveyed and discharged to the outlet side of the first cutting machine, or the first product pipe is retracted and transported to the first product pipe. 1 Third transport roll group to be fed back to the entry side of the cutting machine,
A presser roll arranged above the third transport roll group and
A seamless steel pipe cutting device comprising a second transport roll group for allowing the remaining portion of the first product pipe or the seamless steel pipe to enter the second cutting machine. 前記第３搬送ロール群は、前記第１切断機に対して接近し、離反する往復運動を行うことを特徴とする請求項１に記載の継目無鋼管の切断装置。 The seamless steel pipe cutting device according to claim 1 , wherein the third transport roll group performs a reciprocating motion of approaching and separating from the first cutting machine.
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JPS6080817U (en) * 1983-11-08 1985-06-05 株式会社神戸製鋼所 Shearing machine front and rear tables
JPS60167622U (en) * 1984-03-27 1985-11-07 株式会社神戸製鋼所 crop processing equipment
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