JP5712540B2 - Hemispherical transfer roll for steel pipes with excellent wear resistance - Google Patents

Hemispherical transfer roll for steel pipes with excellent wear resistance Download PDF

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JP5712540B2
JP5712540B2 JP2010216901A JP2010216901A JP5712540B2 JP 5712540 B2 JP5712540 B2 JP 5712540B2 JP 2010216901 A JP2010216901 A JP 2010216901A JP 2010216901 A JP2010216901 A JP 2010216901A JP 5712540 B2 JP5712540 B2 JP 5712540B2
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hemispherical
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metal fitting
steel pipe
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中島 浩一
浩一 中島
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JFE Steel Corp
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Description

本発明は、耐摩耗性に優れるというセラミックスの特性を生かし、かつ、鋼管進入時の衝撃によってセラミックスに破損が生じることを防止でき、従来ロールよりも使用寿命の長い鋼管用半球型搬送ロールに関する。   The present invention relates to a hemispherical conveyance roll for steel pipes that takes advantage of the characteristics of ceramics that are excellent in wear resistance and that can prevent the ceramics from being damaged by impact when entering a steel pipe and that has a longer service life than conventional rolls.

所定の外・内径と長さをもつ鋼管は、外表面が球面の一部で形成された鋼管用半球型搬送ロールによって支持され、搬送される。このような鋼管用半球型搬送ロール1は、図4に示したように、鋼管Wの搬送方向に対し、ロール軸5を傾けて搬送方向複数個所に配置されている。
なお、図4は、超音波探傷装置8で探傷検査を行う検査ラインの配置図であり、中央部の探傷セクションには鋼管用半球型搬送ロール1が6対配置され、その入側および出側のセクションにも、鋼管用半球型搬送ロール1が複数対配置されている。
A steel pipe having a predetermined outer / inner diameter and length is supported and transported by a hemispherical transport roll for steel pipe whose outer surface is formed of a part of a spherical surface. As shown in FIG. 4, the steel pipe hemispherical conveyance roll 1 is disposed at a plurality of positions in the conveyance direction with the roll shaft 5 being inclined with respect to the conveyance direction of the steel pipe W.
FIG. 4 is a layout diagram of an inspection line for performing a flaw detection inspection with the ultrasonic flaw detection apparatus 8. Six pairs of steel pipe hemispherical conveyance rolls 1 are disposed in the flaw detection section in the center, and the inlet side and the outlet side thereof. Also in this section, a plurality of pairs of hemispherical conveyance rolls 1 for steel pipes are arranged.

図4中、9は超音波探傷装置8の搬送通り芯を示す。
上記した検査ラインでは探傷検査を精度よく効率的に行うために、耐摩耗性に優れ、しかも使用寿命の長い搬送ロールが必要とされる。
つまり、鋼管用半球型搬送ロール1の摩耗が進行するほど、半径が小さくなり、搬送速度が低下する。また、鋼管用半球型搬送ロール1の摩耗が進行し、外表面の形状が崩れると超音波探傷装置8の搬送通り芯9と、管軸芯10とのずれが大きくなり、探傷精度が低下する。搬送速度低下、探傷精度悪化を防止するには、ロール交換を早期に行う必要があるが、これを行うと、ロール交換時間が増大し、生産性の低下につながる。このため、セラミックス製ロールのように耐摩耗性に優れた搬送ロールが必要とされる。
In FIG. 4, reference numeral 9 denotes a conveyance lead of the ultrasonic flaw detector 8.
In the inspection line described above, in order to perform flaw detection with high accuracy and efficiency, a transport roll having excellent wear resistance and a long service life is required.
That is, as the wear of the steel pipe hemispherical conveyance roll 1 progresses, the radius decreases and the conveyance speed decreases. Further, when the wear of the steel pipe hemispherical conveyance roll 1 progresses and the shape of the outer surface collapses, the deviation between the conveyance core 9 of the ultrasonic flaw detector 8 and the tube axis core 10 increases, and the flaw detection accuracy decreases. . In order to prevent a decrease in the conveyance speed and a deterioration in flaw detection accuracy, it is necessary to replace the roll at an early stage. However, if this is performed, the roll replacement time increases, leading to a decrease in productivity. For this reason, the conveyance roll excellent in abrasion resistance like a ceramic roll is required.

ここで、特許文献1には従来技術として、鋼管製造工程のクーリングベッド、矯正、管厚、および外径検査(非破壊検査)、管端切断などで、鋼管用半球型搬送ロールにセラミックス製ロールが使用されていたと記載されている。
また、弾性材料からなる層のうえに、金属またはセラミックスの溶射層を形成した金属管用搬送ロールも提案されている(特許文献2)。
Here, in Patent Document 1, as a conventional technique, a cooling bed, straightening, pipe thickness and outer diameter inspection (nondestructive inspection), pipe end cutting, etc. in a steel pipe manufacturing process, a hemispherical conveyance roll for steel pipe, and a ceramic roll Is described as being used.
In addition, a metal tube transport roll in which a metal or ceramic sprayed layer is formed on a layer made of an elastic material has also been proposed (Patent Document 2).

特開昭62―246614号公報JP-A-62-246614 実開平1―127603号公報Japanese Utility Model Publication No. 1-1127603

しかし、特許文献1には、セラミックスの破損を防止する技術に関して言及がない。また、特許文献1には、使用寿命が6ヶ月程度である樹脂製の搬送ロールに関して記載され、耐摩耗性が不十分であるという、問題がある。
したがって、鋼管用半球型搬送ロールにセラミックス製ロールを用いた場合、摩耗が進行するよりも前に、鋼管進入時の衝撃によってセラミックスに破損が生じ、これに起因して使用寿命が短くなることが懸念される。
However, Patent Document 1 does not mention a technique for preventing breakage of ceramics. Further, Patent Document 1 describes a resin-made transport roll having a service life of about 6 months, and has a problem that wear resistance is insufficient.
Therefore, when a ceramic roll is used for the hemispherical conveyance roll for steel pipes, the ceramics may be damaged by the impact when entering the steel pipe before the wear progresses, and this may shorten the service life. Concerned.

特許文献2記載の金属管用搬送ロールは、弾性材料からなる層のうえに、耐摩耗性に優れた溶射層を厚く形成するのは困難であり、使用寿命に問題がある。
本発明は、上記従来技術の問題点を解消し、耐摩耗性に優れるというセラミックスの特性を生かし、かつ、鋼管進入時の衝撃によってセラミックスに破損が生じることを防止でき、従来ロールよりも使用寿命の長い鋼管用半球型搬送ロールを提供することを目的とする。
In the metal tube transport roll described in Patent Document 2, it is difficult to form a thick sprayed layer having excellent wear resistance on a layer made of an elastic material, and there is a problem in the service life.
The present invention solves the above-mentioned problems of the prior art, makes use of the characteristics of ceramics that are excellent in wear resistance, and can prevent the ceramics from being damaged by impact when entering a steel pipe, and has a longer service life than conventional rolls. An object of the present invention is to provide a hemispherical transport roll for a long steel pipe.

本発明者らは、鋭意検討し、以下の形状を有する2種の金具を、鋼管進入時の衝撃を受ける部材とすることで、上記した課題を解決できることを知見し、本発明をなした。
本発明は、以下のとおりである。
1.鋼管用半球型搬送ロールであって、半球状体の中心をとおり、背面に垂直な貫通孔を有するセラミックス部と、該セラミックス部の貫通孔の内周面全面を覆うスリーブ状の金具と、該セラミックス部の背面全面を覆うリング状の金具と、該セラミックス部へ回転を伝達可能に構成してなるロール軸とを具備し、前記スリーブ状の金具が前記セラミックス部の前面側から前記貫通孔へ挿入され、前記リング状の金具が前記セラミックス部の背面側に配置されて前記スリーブ状の金具とねじ結合され、かつ前記2種の金具は接着剤によって前記セラミックス部へ固着してなることを特徴とする耐摩耗性に優れた半球型鋼管用搬送ロール。
2.前記ロール軸は、前記セラミックス部に接着剤によって固着したスリーブ状の金具を、締結手段で挟み込む構造とし、前記セラミックス部から取り外し可能としてなることを特徴とする上記1.に記載の耐摩耗性に優れた半球型鋼管用搬送ロール。
The present inventors diligently studied and found that the above-described problems can be solved by using two kinds of metal fittings having the following shapes as members that receive an impact when entering a steel pipe, and made the present invention.
The present invention is as follows.
1. A steel pipe hemispherical transport roll, passing through the center of the hemispherical body and having a through hole perpendicular to the back surface, a sleeve-like metal fitting covering the entire inner peripheral surface of the through hole of the ceramic part, A ring-shaped metal fitting covering the entire back surface of the ceramic portion; and a roll shaft configured to transmit rotation to the ceramic portion; and the sleeve-shaped metal fitting from the front surface side of the ceramic portion to the through hole. The ring-shaped metal fitting is inserted on the back side of the ceramic portion and is screwed to the sleeve-shaped metal fitting, and the two types of metal fittings are fixed to the ceramic portion with an adhesive. semi-ball-type pipe for conveying roll excellent in wear resistance to.
2. The roll shaft has a structure in which a sleeve-shaped metal fitting fixed to the ceramic portion with an adhesive is sandwiched between fastening means, and is removable from the ceramic portion. Semi-ball-type pipe for conveying roll having excellent wear resistance according to.

本発明によれば、2種の金具を接着剤によってセラミックス部へ固着して鋼管進入時の衝撃を受ける部材としたから、耐摩耗性に優れるというセラミックスの特性を生かし、かつ、鋼管進入時の衝撃によってセラミックスに破損が生じることを防止でき、従来ロールよりも使用寿命の長い鋼管用半球型搬送ロールを実現できる。   According to the present invention, since the two types of metal fittings are fixed to the ceramic portion with an adhesive to receive a shock when entering the steel pipe, the ceramic characteristics of excellent wear resistance are utilized, and when the steel pipe enters. It is possible to prevent the ceramic from being damaged by impact, and to realize a hemispherical conveyance roll for steel pipes that has a longer service life than conventional rolls.

本発明例の鋼管用半球型搬送ロールの構造を示す断面図である。It is sectional drawing which shows the structure of the hemispherical conveyance roll for steel pipes of the example of this invention. 図1の本発明例に用いた緩衝用金具の形状を示す背面図である。It is a rear view which shows the shape of the buffer metal fitting used for the example of this invention of FIG. 本発明例と肉盛溶接ロールとの耐摩耗性を示す特性図である。It is a characteristic view which shows the abrasion resistance of the example of this invention and the overlay welding roll. 超音波探傷装置(UST)で鋼管の探傷検査を行う検査ラインの配置図である。It is an arrangement view of an inspection line for performing a flaw detection inspection of a steel pipe with an ultrasonic flaw detection apparatus (UST).

以下、本発明例の鋼管用半球型搬送ロールについて図を用い、詳細に説明する。
図1は、本発明例の鋼管用半球型搬送ロール1の構造を示す断面図、図2は図1の本発明例に用いた2種の金具3,4の形状を示す背面図である。2種の金具3,4はそれぞれセラミックス部2へ接着剤によって固着されている。
この2種の金具のうち一方の、セラミックス部2の貫通孔の内周面全面を覆うことができるスリーブ状の金具3は、セラミックス部2の前面側(図1中の左側)からセラミックス部2の貫通孔へ挿入され、残るセラミックス部2の背面全面を覆うことができるリング状の金具4は、セラミックス部2の背面側に配置され、前面側から貫通孔へ挿入されたスリーブ状の金具3とねじ結合される。
Hereinafter, the hemispherical conveyance roll for steel pipes of the present invention example will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing the structure of a hemispherical conveyance roll 1 for steel pipes according to the present invention, and FIG. 2 is a rear view showing the shapes of two types of metal fittings 3 and 4 used in the present invention example of FIG. The two types of metal fittings 3 and 4 are each fixed to the ceramic portion 2 with an adhesive.
The sleeve-shaped metal fitting 3 that can cover the entire inner peripheral surface of the through hole of the ceramic portion 2 is one of the two types of metal fittings. The ceramic portion 2 extends from the front side (left side in FIG. 1) of the ceramic portion 2. A ring-shaped metal fitting 4 that can be inserted into the through hole of the ceramic portion 2 and can cover the entire back surface of the ceramic portion 2 is disposed on the back side of the ceramic portion 2 and is inserted into the through hole from the front surface side. And screwed together.

前記したスリーブ状の金具3には、前面側および背面側の内周にそれぞれリング状の段差3b、3cが形成され、また図1、2に示したように、キー溝3aが設けられている。キー溝は、ロール軸5の先端部にも設けられている(図1中のキー溝5b)。
ここで、セラミックス部2は、図1に示したように、外表面が球面の一部で形成されたもので、半球状体の中心Oをとおり、背面に垂直に貫通孔を穿孔することで得ることができる。たとえばセラミックスの一種であるSiからなる半球状体を用いることが好適であるが、本発明に用いるセラミックスは、Siに限定されない。
The sleeve-shaped metal fitting 3 is formed with ring-shaped steps 3b and 3c on the inner circumferences on the front side and the back side, respectively, and is provided with a key groove 3a as shown in FIGS. . The key groove is also provided at the tip of the roll shaft 5 (key groove 5b in FIG. 1).
Here, as shown in FIG. 1, the ceramic portion 2 has an outer surface formed by a part of a spherical surface, passes through the center O of the hemispherical body, and drills a through hole perpendicular to the back surface. Can be obtained. For example, it is preferable to use a hemispherical body made of Si 3 N 4 which is a kind of ceramic, but the ceramic used in the present invention is not limited to Si 3 N 4 .

図1中、Rは半球状体の半径である。5はロール軸を示し、段差5aより先端側はスリーブ状の金具の段差3b、3cの間の内周に嵌合可能な径となっている。段差5aより基端側(図中右側)は、スリーブ状金具の段差3cより背面側の内周に嵌合可能な径となっている。6は締結手段である締結ナットを示す。締結ナット6は、ロール軸5の先端部に設けた雄ねじと、ねじ結合する雌ねじを有する。7はキー溝3aに挿入したキーを示す。   In FIG. 1, R is the radius of the hemispherical body. Reference numeral 5 denotes a roll shaft, and the tip side of the step 5a has a diameter that can be fitted to the inner periphery between the steps 3b and 3c of the sleeve-shaped metal fitting. The base end side (right side in the figure) from the step 5a has a diameter that can be fitted to the inner periphery on the back side from the step 3c of the sleeve-shaped metal fitting. Reference numeral 6 denotes a fastening nut as fastening means. The fastening nut 6 has a male screw provided at the tip of the roll shaft 5 and a female screw that is screw-coupled. Reference numeral 7 denotes a key inserted into the keyway 3a.

このように本発明例の半球型鋼管用搬送ロール1は、半球状体の中心Oをとおり、背面に垂直な貫通孔を有するセラミックス部2と、上記した2種の金具3,4と,セラミックス部2へ回転を伝達可能に構成してなるロール軸5とを具備し、2種の金具3,4を接着剤によってセラミックス部2へ固着したことを特徴とする。
本発明によれば、2種の金具3,4を接着剤によってセラミックス部2へ固着して、鋼管進入時の衝撃を受ける部材としたので、実施例で説明するように、耐摩耗性に優れるというセラミックスの特性を生かし、かつ、鋼管進入時の衝撃によってセラミックスに破損が生じることを防止できる。
As described above, the transport roll 1 for a hemispherical steel pipe according to the present invention includes a ceramic part 2 having a through-hole perpendicular to the back surface through the center O of the hemispherical body, the above-described two types of metal fittings 3 and 4, and ceramics. And a roll shaft 5 configured to transmit rotation to the portion 2, and two types of metal fittings 3 and 4 are fixed to the ceramic portion 2 with an adhesive.
According to the present invention, since the two types of metal fittings 3 and 4 are fixed to the ceramic portion 2 with an adhesive and are subjected to an impact when entering the steel pipe, the wear resistance is excellent as described in the embodiments. Taking advantage of the characteristics of ceramics, it is possible to prevent the ceramics from being damaged by an impact when entering a steel pipe.

ロール軸5は、セラミックス部2へ接着剤によって固着したスリーブ状の金具3を、締結ナット6で挟み込む構造としてなるのが好ましい。
この理由は、使用寿命まで使用したセラミックス部2の交換を行う際、締結ナット6を回して緩めることで、セラミックス部2をロール軸5から容易に取外せるからである。
ただし、使用寿命まで使用したセラミックス部2は、再利用が難しいので、ロール軸5から取外した後、使用したセラミックス部2をハンマーなどでたたいて破壊することで、セラミックス部2へ接着剤によって固着した2種の金具3,4の方だけを、再利用することになる。
The roll shaft 5 preferably has a structure in which a sleeve-shaped metal fitting 3 fixed to the ceramic portion 2 with an adhesive is sandwiched between fastening nuts 6.
This is because the ceramic part 2 can be easily removed from the roll shaft 5 by turning and loosening the fastening nut 6 when replacing the ceramic part 2 used until the service life.
However, since the ceramic part 2 used until the end of its service life is difficult to reuse, after removing it from the roll shaft 5, the used ceramic part 2 is destroyed by hitting it with a hammer or the like. Only the two types of fixed metal fittings 3 and 4 are reused.

そこで、半球型鋼管用搬送ロール1を組み立てる際、2種の金具3,4は固化することで、強固な接着力を示すエポキシ樹脂からなる接着剤を介してセラミックス部2へ固着するのが好ましい。
なお、図2に示した、リング状の金具4のボルト孔4aは、半球型鋼管用搬送ロール1を組み立てる過程で、セラミックス部2の背面にリング状の金具4が接着剤によって固着するまでボルトで締め付けておくためのものである。
Therefore, when assembling the transport roll 1 for the hemispherical steel pipe, it is preferable that the two kinds of metal fittings 3 and 4 are solidified to be fixed to the ceramic portion 2 via an adhesive made of an epoxy resin showing a strong adhesive force. .
The bolt hole 4a of the ring-shaped metal fitting 4 shown in FIG. 2 is a bolt until the ring-shaped metal fitting 4 is fixed to the back surface of the ceramic portion 2 with an adhesive in the process of assembling the hemispherical steel pipe transport roll 1. It is for tightening with.

図1に示した半球型鋼管用搬送ロール1を、超音波探傷装置(UST)で継目無鋼管の探傷検査を行う検査ラインに組み込み、使用寿命を評価した。
その結果を、図3に示した。
ただし、セラミックス部2の寸法、スリーブ状の金具3とリング状の金具4の寸法、およびロール軸5の寸法は以下とした。
(1)セラミックス部2の寸法:半球状体の半径R=100mm、貫通孔の直径=95mm、有効軸方向長さL=80mm。(2)スリーブ状の金具3の寸法:全長=95mm、中央部の外径=95mm、中央部の内径=50mm。(3)リング状の金具4の寸法:外径=200mm、内径=95mm、厚み=10mm。(4)ロール軸5の直径=70mm、ロール軸5の雄ねじ外径=50mm。
The hemispherical steel pipe transport roll 1 shown in FIG. 1 was incorporated into an inspection line for performing a flaw detection inspection of a seamless steel pipe with an ultrasonic flaw detector (UST), and the service life was evaluated.
The results are shown in FIG.
However, the dimensions of the ceramic portion 2, the dimensions of the sleeve-shaped metal fitting 3 and the ring-shaped metal fitting 4, and the dimensions of the roll shaft 5 were as follows.
(1) Dimensions of ceramic part 2: hemispherical radius R = 100 mm, diameter of through hole = 95 mm, effective axial length L = 80 mm. (2) Dimensions of the sleeve-shaped metal fitting 3: total length = 95 mm, outer diameter of the central part = 95 mm, inner diameter of the central part = 50 mm. (3) Dimensions of the ring-shaped metal fitting 4: outer diameter = 200 mm, inner diameter = 95 mm, thickness = 10 mm. (4) Diameter of roll shaft 5 = 70 mm, male screw outer diameter of roll shaft 5 = 50 mm.

なお、肉盛溶接ロールは、C含有量:0.45mass%の炭素鋼の基地に、Ni-WCからなる肉盛溶接層を3mm形成したものである。
本発明例、肉盛溶接ロールともに、図4中の黒抜きで示した超音波探傷装置8の搬送方向上流側と下流側に配置して、使用日数と、X=69mmの位置での磨耗量との関係を調査した。半球状体の背面からの距離X=69mmの位置は、最も磨耗が進行する位置である。
The build-up welding roll is formed by forming a build-up weld layer made of Ni—W x C on a base of carbon steel having a C content of 0.45 mass%.
Both the example of the present invention and the overlay welding roll are arranged on the upstream side and the downstream side in the conveying direction of the ultrasonic flaw detector 8 shown in black in FIG. And investigated the relationship. The position at a distance X = 69 mm from the back of the hemispherical body is the position where the wear proceeds most.

図3に示した結果から、使用後9ヶ月経過した時点で、本発明例の方が、肉盛溶接ロールに比べて5倍という耐摩耗性を有し、しかも、鋼管進入時の衝撃によってセラミックスに生じやすい破損を防止できていることがわかる。
また、肉盛溶接ロールの場合、使用後1年を経過すると、肉盛溶接層3mmが磨耗によって消滅し、磨耗量が急上昇するため、使用寿命≒1年である。
From the results shown in FIG. 3, at the time when 9 months have passed after use, the example of the present invention has a wear resistance of 5 times that of the overlay welding roll, and the ceramics are affected by the impact when entering the steel pipe. It can be seen that it is possible to prevent damage that is likely to occur.
Further, in the case of a build-up welding roll, when 1 year has passed after use, the build-up weld layer 3 mm disappears due to wear and the amount of wear increases rapidly, so that the service life is about 1 year.

これに対して本発明例の場合には、使用後9ヶ月経過した時点での摩耗量が0.4mmであるため、摩耗量が3mmに達するまでの使用寿命を推定すると、使用寿命≒5年となり、従来ロールよりも寿命が長い。   On the other hand, in the case of the present invention example, the wear amount at the time when 9 months have elapsed after use is 0.4 mm. Therefore, when the service life until the wear amount reaches 3 mm is estimated, the service life ≈ 5 years Thus, the service life is longer than that of the conventional roll.

W 鋼管
O 半球状体の中心
R 半球状体の半径
L 有効軸方向長さ
X 半球状体の背面からの距離
1 半球型鋼管用搬送ロール
2 セラミックス部
3、4 金具
3a キー溝
3b、3c 段差
4a ボルト孔
5 ロール軸
5a 段差
6 締結ナット(締結手段)
7 キー
8 超音波探傷装置
9 搬送通り芯
10 管軸芯
W Steel pipe O Center of hemispherical body R Radius of hemispherical body L Effective length in the axial direction X Distance from the back of the hemispherical body 1 Transport roll for hemispherical steel pipe 2 Ceramic part 3, 4 Metal fitting 3a Key groove 3b, 3c Step 4a Bolt hole 5 Roll shaft 5a Step 6 Fastening nut (fastening means)
7 Key 8 Ultrasonic flaw detector 9 Transport core
10 Tube axis

Claims (2)

鋼管用半球型搬送ロールであって、半球状体の中心をとおり、背面に垂直な貫通孔を有するセラミックス部と、該セラミックス部の貫通孔の内周面全面を覆うスリーブ状の金具と、該セラミックス部の背面全面を覆うリング状の金具と、該セラミックス部へ回転を伝達可能に構成してなるロール軸とを具備し、前記スリーブ状の金具が前記セラミックス部の前面側から前記貫通孔へ挿入され、前記リング状の金具が前記セラミックス部の背面側に配置されて前記スリーブ状の金具とねじ結合され、かつ前記2種の金具は接着剤によって前記セラミックス部へ固着してなることを特徴とする耐摩耗性に優れた半球型鋼管用搬送ロール。 A steel pipe hemispherical transport roll, passing through the center of the hemispherical body and having a through hole perpendicular to the back surface, a sleeve-like metal fitting covering the entire inner peripheral surface of the through hole of the ceramic part, A ring-shaped metal fitting covering the entire back surface of the ceramic portion; and a roll shaft configured to transmit rotation to the ceramic portion; and the sleeve-shaped metal fitting from the front surface side of the ceramic portion to the through hole. The ring-shaped metal fitting is inserted on the back side of the ceramic portion and is screwed to the sleeve-shaped metal fitting, and the two types of metal fittings are fixed to the ceramic portion with an adhesive. A hemispherical steel pipe transport roll with excellent wear resistance. 前記ロール軸は、前記セラミックス部に接着剤によって固着したスリーブ状の金具を、締結手段で挟み込む構造とし、前記セラミックスから取り外し可能としてなることを特徴とする請求項1に記載の耐摩耗性に優れた半球型鋼管用搬送ロール。 2. The wear resistance according to claim 1, wherein the roll shaft has a structure in which a sleeve-like metal fitting fixed to the ceramic portion with an adhesive is sandwiched between fastening means and is removable from the ceramic portion. Excellent transport roll for hemispherical steel pipe.
JP2010216901A 2010-09-28 2010-09-28 Hemispherical transfer roll for steel pipes with excellent wear resistance Active JP5712540B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5847299B2 (en) * 1976-06-19 1983-10-21 新日本製鐵株式会社 Flexible feeding device for long materials with circular cross section
JPS61119503A (en) * 1984-11-13 1986-06-06 Kubota Ltd Tube carrier
JPH04297858A (en) * 1991-03-27 1992-10-21 Power Reactor & Nuclear Fuel Dev Corp Defect detector

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