JP2003103329A - Manufacturing method for steel pipe for cylinder - Google Patents
Manufacturing method for steel pipe for cylinderInfo
- Publication number
- JP2003103329A JP2003103329A JP2001298967A JP2001298967A JP2003103329A JP 2003103329 A JP2003103329 A JP 2003103329A JP 2001298967 A JP2001298967 A JP 2001298967A JP 2001298967 A JP2001298967 A JP 2001298967A JP 2003103329 A JP2003103329 A JP 2003103329A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- cylinder
- manufacturing
- roll
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シリンダー装置の
シリンダー部またはロッド部として用いられるシリンダ
ー用鋼管の製造法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a steel pipe for a cylinder used as a cylinder portion or a rod portion of a cylinder device.
【０００２】[0002]
【従来の技術】シリンダー用鋼管のうち、シリンダー部
については内面の真円度が要求され、ロッド部について
は外面の真円度が要求される。また何れについても疲労
特性を向上させるために残留応力のないことが要求され
る。このため、従来から原鋼管となるシームレス鋼管又
は電縫鋼管を内面切削したり、外面切削してシリンダー
用鋼管とする方法が用いられている。2. Description of the Related Art Among steel pipes for cylinders, the cylinder portion is required to have a circularity on the inner surface, and the rod portion is required to have a circularity on the outer surface. Further, in each case, it is required that there be no residual stress in order to improve the fatigue characteristics. For this reason, conventionally, there has been used a method in which a seamless steel pipe or an electric resistance welded steel pipe which is a raw steel pipe is internally cut or externally cut to obtain a cylinder steel pipe.
【０００３】しかしシームレス鋼管と電縫鋼管の何れ
も、造管されたままの状態では真円度が不足しているた
め、切削加工によって真円を出すためには切削代がかな
り大きくなり、コスト的な負担が大きかった。また、造
管される原鋼管の径は規格化されているため、シリンダ
ー用鋼管として要求される径が規格径の中間にあるよう
な場合には、製造が困難であった。However, since both the seamless steel pipe and the electric resistance welded steel pipe have insufficient roundness in the as-made state, the cutting allowance is considerably large in order to form a perfect circle by cutting, and the cost is low. Was a heavy burden. Further, since the diameter of the raw steel pipe to be piped is standardized, it has been difficult to manufacture when the diameter required for the steel pipe for a cylinder is in the middle of the standard diameter.
【０００４】そこで、冷間引抜加工を行なうことにより
原鋼管の外径を所望の径に絞ったうえ、内面切削または
外面切削する方法を取ることもある。しかし、冷間加工
により発生する歪みや残留応力を除去するためには切削
前に熱処理を必要とし、この熱処理に伴って生ずる変形
を矯正する必要が生ずるが、その矯正工程で再び残留応
力が生ずるという悪循環に陥る。このため残留応力を十
分に小さくすることはできず、疲労強度の点で問題があ
った。Therefore, there is a method in which the outer diameter of the raw steel pipe is reduced to a desired diameter by cold drawing, and then the inner surface or the outer surface is cut. However, in order to remove the strain and residual stress generated by cold working, heat treatment is required before cutting, and it is necessary to correct the deformation caused by this heat treatment, but residual stress is generated again in the correction process. Fall into a vicious circle. Therefore, the residual stress cannot be sufficiently reduced, and there is a problem in terms of fatigue strength.
【０００５】また、引抜型を変更すれば外径を自由に変
更することができるものの、その都度引抜型を製作しな
ければならず、時間的にも経済的にも制約があった。し
かも冷間引抜加工では肉厚は常に減少するのみであるか
ら、原鋼管よりも肉厚のシリンダー用鋼管を製造するこ
とは不可能であった。Further, although the outside diameter can be freely changed by changing the drawing die, the drawing die must be manufactured each time, and there are restrictions in terms of time and cost. Moreover, since the wall thickness is always reduced only by cold drawing, it was impossible to manufacture a steel pipe for a cylinder having a wall thickness larger than that of the raw steel pipe.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、真円度が高く残留応力を非常に低減
した疲労強度に優れたシリンダー用鋼管を、要求される
径が原鋼管の径と一致しないような場合にも経済的に製
造することができるシリンダー用鋼管の製造法を提供す
るためになされたものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides a steel pipe for a cylinder having a high roundness and a significantly reduced residual stress and excellent fatigue strength. The purpose of the present invention is to provide a method for manufacturing a steel pipe for a cylinder which can be economically manufactured even when the diameter of the steel pipe does not match.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
めになされた請求項１の発明のシリンダー用鋼管の製造
法は、原鋼管の両端をチャックして回転させつつ一方向
へ移動させ、加工部分を加熱しながらロールを押し当て
て外径を一定に加工することを特徴とするものである。
また請求項２の発明のシリンダー用鋼管の製造法は、原
鋼管の両端をチャックして回転させつつ一方向へ移動さ
せ、加工部分を加熱しながらロールを押し当てて、段差
部の両側の外径がそれぞれ一定となるように加工するこ
とを特徴とするものである。このとき、原鋼管に引張力
または圧縮力を作用させながら加工することにより、肉
厚を原鋼管より薄くしたり厚くすることができる。The method for manufacturing a steel pipe for a cylinder according to the invention of claim 1 made in order to solve the above-mentioned problems, comprises moving both ends of a raw steel pipe in one direction while chucking and rotating them. It is characterized in that a roll is pressed against the processed portion to heat it so that the outer diameter is constant.
Further, in the method for manufacturing a steel pipe for a cylinder according to the invention of claim 2, the both ends of the raw steel pipe are chucked and moved in one direction while being rotated, and the roll is pressed while heating the processed portion, so that both sides of the stepped portion It is characterized in that it is processed so that the diameters are constant. At this time, the wall thickness can be made thinner or thicker than the raw steel pipe by processing the raw steel pipe while applying a tensile force or a compressive force.
【０００８】本発明によれば、加熱と加工をほぼ同時に
行うので、残留応力を非常に小さくすることができ、疲
労強度が飛躍的に優れたシリンダー用鋼管を得ることが
できる。また回転させながら加工を行なうため、優れた
真円度を得ることができる。さらに任意の径に加工する
ことができるので、要求される径が原鋼管の径と一致し
ないような場合にも経済的にシリンダー用鋼管を製造す
ることができる。According to the present invention, since heating and working are carried out almost at the same time, residual stress can be made extremely small, and a steel pipe for a cylinder having dramatically superior fatigue strength can be obtained. Further, since the processing is performed while rotating, excellent roundness can be obtained. Further, since it can be processed into an arbitrary diameter, it is possible to economically manufacture a steel pipe for a cylinder even when the required diameter does not match the diameter of the raw steel pipe.
【０００９】[0009]
【発明の実施の形態】以下に本発明の好ましい実施形態
を示す。図１は本実施形態において用いられる装置の平
面図、図２は正面図であり、中央のロール装置１の前後
両側にレール２、３が直線的に設置されている。このロ
ール装置１は図３に示すように、３個のロール４を備え
たものであり、鋼管の外周からこれらのロール４を均等
に押し当てて加工を行なうことができるものである。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention are shown below. FIG. 1 is a plan view of the apparatus used in the present embodiment, and FIG. 2 is a front view, and rails 2 and 3 are linearly installed on both front and rear sides of a central roll apparatus 1. As shown in FIG. 3, this roll device 1 is provided with three rolls 4, and can perform processing by uniformly pressing these rolls 4 from the outer circumference of the steel pipe.
【００１０】出側のレール２上には、走行用モータ５を
備えた台車６が搭載されており、この台車６には回転用
モータ７を備えた主軸８が搭載されている。主軸８の先
端には原鋼管Ｗの出側端部を保持するチャック９が取付
けられている。同様に、入側のレール３上にも台車１０
が設けられており、この台車１０上には回転用モータ１
１を備えた主軸１２が搭載されている。主軸１２の先端
には原鋼管Ｗの入側端部を保持するチャック１３が取付
けられている。この入側の台車１０は油圧モータ等から
なる走行速度の制御機構１４が設けられている。台車６
と台車１０の移動速度は、制御盤１５によって個別に制
御することができる。なお、この入側の台車１０には原
鋼管Ｗに作用する張力を測定できるセンサ１６を設けて
おく。A carriage 6 equipped with a traveling motor 5 is mounted on the exit side rail 2, and a main shaft 8 equipped with a rotation motor 7 is mounted on the carriage 6. A chuck 9 that holds the exit end of the raw steel pipe W is attached to the tip of the main shaft 8. Similarly, the carriage 10 is also mounted on the entrance side rail 3.
Is provided, and a rotation motor 1 is mounted on the carriage 10.
1 is equipped with a spindle 12. A chuck 13 that holds the inlet end of the raw steel pipe W is attached to the tip of the main shaft 12. The entry-side carriage 10 is provided with a traveling speed control mechanism 14 including a hydraulic motor or the like. Dolly 6
The moving speed of the carriage 10 and the carriage 10 can be individually controlled by the control panel 15. The trolley 10 on the entry side is provided with a sensor 16 capable of measuring the tension acting on the raw steel pipe W.
【００１１】上記の装置を用いてシリンダー用鋼管を製
造するには、原鋼管Ｗとしてシームレス鋼管または電縫
鋼管を準備し、その両端を台車６のチャック９と台車１
０のチャック１３によりそれぞれチャックして一定方向
に回転させる。出側の台車１０は走行用モータ５により
一定速度で図面上の左方向に走行し、原鋼管Ｗを出側に
引き出す。原鋼管Ｗはロール装置１の手前に設けられた
加熱装置２０により加工部分が数百℃に加熱されたうえ
ロール４を押し当てられて外径が一定となるように加工
される。In order to manufacture a steel pipe for a cylinder using the above apparatus, a seamless steel pipe or an electric resistance welded steel pipe is prepared as the raw steel pipe W, and both ends of the seamless steel pipe or the electric resistance welded steel pipe are provided with the chuck 9 of the carriage 6 and the carriage 1.
Each chuck 13 is chucked and rotated in a fixed direction. The truck 10 on the delivery side travels leftward in the drawing at a constant speed by the traveling motor 5 and pulls out the raw steel pipe W to the delivery side. The raw steel pipe W is processed by the heating device 20 provided in front of the roll device 1 so that the processed portion is heated to several hundreds of degrees Celsius and the roll 4 is pressed against it so that the outer diameter becomes constant.
【００１２】上記の装置によれば、入側の台車１０の走
行速度を追従移動速度よりも速くすることにより、原鋼
管Ｗをロール装置１に向かって押し込むようにして圧縮
力を作用させることができる。これにより、原鋼管Ｗよ
りも肉厚のシリンダー用鋼管を得ることが可能となる。
逆に入側の台車１０の走行速度を追従移動速度以下とし
て引張力を作用させれば、原鋼管Ｗよりも肉薄のシリン
ダー用鋼管を得ることが可能となる。なお台車１０の走
行速度の制御は、センサ１６により測定された張力に基
づいて制御することが好ましい。According to the above apparatus, the traveling speed of the trolley 10 on the entrance side is made higher than the following movement speed, so that the raw steel pipe W is pushed toward the roll device 1 and a compressive force is exerted. it can. As a result, it becomes possible to obtain a cylinder steel pipe having a thickness larger than that of the raw steel pipe W.
Conversely, if the tensile force is applied with the traveling speed of the trolley 10 on the entry side set to be equal to or lower than the following movement speed, it becomes possible to obtain a steel pipe for a cylinder thinner than the raw steel pipe W. The traveling speed of the carriage 10 is preferably controlled based on the tension measured by the sensor 16.
【００１３】上記のように、本発明によれば加熱装置２
０による加熱とロール４による加工を同時に行うので得
られたシリンダー用鋼管の残留応力を小さくすることが
でき、疲労強度を飛躍的に向上させることができる。ま
た原鋼管Ｗを回転させながらロール４による加工を行な
うため、優れた真円度を得ることができ、後工程におけ
る切削代を少なくすることができる。さらに任意の径や
肉厚のシリンダー用鋼管を製造することができる。As mentioned above, according to the present invention the heating device 2
Since the heating by 0 and the processing by the roll 4 are performed at the same time, the residual stress of the obtained steel pipe for a cylinder can be reduced, and the fatigue strength can be dramatically improved. Further, since the work is performed by the roll 4 while rotating the raw steel pipe W, excellent roundness can be obtained, and the cutting allowance in the post process can be reduced. Further, a steel pipe for a cylinder having an arbitrary diameter and wall thickness can be manufactured.
【００１４】請求項１の発明によれば、外径が一定のシ
リンダー用鋼管が製造されるが、請求項２の発明ではロ
ール４の押し当て方を変更することによって、図５に示
すように段差部の両側の外径がそれぞれ一定のシリンダ
ー用鋼管を製造することができる。According to the invention of claim 1, a steel pipe for a cylinder having a constant outer diameter is manufactured. However, according to the invention of claim 2, by changing the pressing method of the roll 4, as shown in FIG. It is possible to manufacture a steel pipe for a cylinder in which the outer diameters on both sides of the step portion are constant.
【００１５】[0015]
【実施例】（実施例１）原鋼管として外径が１６５.２
ｍｍ、肉厚が１３.１ｍｍの電縫鋼管を用い、実施形態
に示した装置により両端をチャックして１８０ｒｐｍで
回転させながら、加工温度を７３０℃とし、外径が１６
２.０ｍｍの一定径となるようにロール加工を行なっ
た。このとき鋼管に軸方向の力が作用しないように入側
台車の走行速度を制御したところ、得られたシリンダー
用鋼管は肉厚が１３.１ｍｍのままであり、真円度に優
れ、残留応力を低減することができた。[Example] (Example 1) The outer diameter of the raw steel pipe is 165.2.
mm, the wall thickness is 13.1 mm, and the processing temperature is 730 ° C. and the outer diameter is 16 while chucking both ends and rotating at 180 rpm by the device shown in the embodiment.
Roll processing was performed so as to have a constant diameter of 2.0 mm. At this time, when the traveling speed of the entrance truck was controlled so that the axial force did not act on the steel pipe, the resulting steel pipe for cylinders had a wall thickness of 13.1 mm, excellent roundness, and residual stress. Could be reduced.
【００１６】（実施例２）実施例１と同様に、原鋼管と
して外径が１６５.２ｍｍ、肉厚が１３.１ｍｍの電縫鋼
管を用い、１８０ｒｐｍで回転させながら、加工温度を
７３０℃とし、外径が１６２.０ｍｍの一定径となるよ
うにロール加工を行なった。このとき鋼管に軸方向の圧
縮力が作用するように入側台車の走行速度を制御したと
ころ、得られたシリンダー用鋼管は肉厚が１４.２ｍｍ
になった。また真円度に優れ、残留応力を低減すること
ができた。(Example 2) As in Example 1, an electric resistance welded steel pipe having an outer diameter of 165.2 mm and a wall thickness of 13.1 mm was used as the raw steel pipe, and the processing temperature was 730 ° C while rotating at 180 rpm. Roll processing was performed so that the outer diameter was a constant diameter of 162.0 mm. At this time, when the traveling speed of the entry side carriage was controlled so that the axial compressive force acts on the steel pipe, the obtained steel pipe for cylinder had a wall thickness of 14.2 mm.
Became. Moreover, the roundness was excellent and the residual stress could be reduced.
【００１７】（実施例３）原鋼管として外径が１６５.
２ｍｍ、肉厚が１０.９ｍｍの電縫鋼管を用い、１８０
ｒｐｍで回転させながら、加工温度を７３０℃とし、外
径が１５６.０ｍｍの一定径となるようにロール加工を
行なった。このとき鋼管に軸方向の引張力が作用するよ
うに入側台車の走行速度を制御したところ、得られたシ
リンダー用鋼管は肉厚が１０.５ｍｍとなった。また真
円度に優れ、残留応力を低減することができた。(Embodiment 3) The outer diameter of the raw steel pipe is 165.
180 mm using ERW steel pipe with a thickness of 2 mm and a thickness of 10.9 mm
While rotating at rpm, the processing temperature was 730 ° C., and the roll processing was performed so that the outer diameter was a constant diameter of 156.0 mm. At this time, when the traveling speed of the entrance truck was controlled so that the tensile force in the axial direction acted on the steel pipe, the thickness of the obtained steel pipe for cylinder was 10.5 mm. Moreover, the roundness was excellent and the residual stress could be reduced.
【００１８】なお、比較のために図４に鋼管の残留応力
値を示す。残留応力は造管状態のままでは１７０〜１８
０ＭＰａ、引抜き状態では２００ＭＰａ、これを熱処理
した状態では８０ＭＰａ程度である。これに対して本発
明により製造されたシリンダー用鋼管では５０ＭＰａ程
度になり、疲労特性を飛躍的に向上させることが可能と
なる。For comparison, FIG. 4 shows the residual stress value of the steel pipe. Residual stress is 170-18 in the pipe-making state
0 MPa, 200 MPa in the drawn state, and about 80 MPa in the heat-treated state. On the other hand, the steel pipe for a cylinder manufactured according to the present invention has a pressure of about 50 MPa, which makes it possible to dramatically improve fatigue characteristics.
【００１９】[0019]
【発明の効果】以上に説明したように、本発明のシリン
ダー用鋼管の製造法によれば、真円度が高く残留応力の
ないシリンダー用鋼管を、経済的に製造することができ
る。また要求される径や肉厚が原鋼管の径と一致しない
シリンダー用鋼管も、新たに型を製作することなく、同
一の装置で容易に製造することができる。As described above, according to the method for manufacturing a cylinder steel pipe of the present invention, a cylinder steel pipe having a high roundness and no residual stress can be economically manufactured. Further, a steel pipe for a cylinder whose required diameter or wall thickness does not match the diameter of the raw steel pipe can be easily manufactured with the same apparatus without newly manufacturing a mold.
【図１】実施形態に用いたシリンダー用鋼管の製造装置
を示す平面図である。FIG. 1 is a plan view showing an apparatus for manufacturing a cylinder steel pipe used in an embodiment.
【図２】実施形態に用いたシリンダー用鋼管の製造装置
を示す正面図である。FIG. 2 is a front view showing an apparatus for manufacturing a cylinder steel pipe used in the embodiment.
【図３】ロール装置の側面図である。FIG. 3 is a side view of a roll device.
【図４】鋼管の残留応力値のグラフである。FIG. 4 is a graph of residual stress values of a steel pipe.
【図５】請求項２の発明により製造されたシリンダー用
鋼管の正面図である。FIG. 5 is a front view of a steel pipe for a cylinder manufactured according to the invention of claim 2.
Ｗ 原鋼管 １ ロール装置 ２ 出側のレール ３ 入側のレール ４ ロール ５ 走行用モータ ６ 出側の台車 ７ 回転用モータ ８ 主軸 ９ チャック １０ 入側の台車 １１ 回転用モータ １２ 主軸 １３ チャック １４ 走行速度の制御機構 １５ 制御盤 １６ 張力のセンサ ２０ 加熱装置 W Raw steel pipe 1 roll device 2 Exit rail 3 Entry side rail 4 rolls 5 Traveling motor 6 Delivery truck 7 rotation motor 8 spindles 9 chuck 10 Incoming truck 11 rotation motor 12 spindles 13 chuck 14 Travel speed control mechanism 15 control panel 16 Tension sensor 20 heating device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 向 通誠 愛知県東海市東海町５−３ 新日本製鐵株 式会社名古屋製鐵所内 Ｆターム(参考） 4E028 LA08 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Makoto Makoto 5-3 Tokai-cho, Tokai-shi, Aichi Nippon Steel Corporation Ceremony Company Nagoya Steel Works F-term (reference) 4E028 LA08
Claims (3)
つ一方向へ移動させ、加工部分を加熱しながらロールを
押し当てて、外径を一定に加工することを特徴とするシ
リンダー用鋼管の製造法。1. A steel pipe for a cylinder, characterized in that both ends of a raw steel pipe are chucked and moved in one direction while being rotated, and a roll is pressed while heating a processed portion to make the outer diameter constant. Manufacturing method.
つ一方向へ移動させ、加工部分を加熱しながらロールを
押し当てて、段差部の両側の外径がそれぞれ一定となる
ように加工することを特徴とするシリンダー用鋼管の製
造法。2. The raw steel pipe is chucked at both ends and is moved in one direction while being rotated, and a roll is pressed against the processed portion while heating so that the outer diameters on both sides of the stepped portion are constant. A method for manufacturing a steel pipe for a cylinder, which is characterized in that
ながら加工することを特徴とする請求項１または２に記
載のシリンダー用鋼管の製造法。3. The method for manufacturing a steel pipe for a cylinder according to claim 1, wherein the raw steel pipe is processed while applying a tensile force or a compressive force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001298967A JP2003103329A (en) | 2001-09-28 | 2001-09-28 | Manufacturing method for steel pipe for cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001298967A JP2003103329A (en) | 2001-09-28 | 2001-09-28 | Manufacturing method for steel pipe for cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003103329A true JP2003103329A (en) | 2003-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001298967A Pending JP2003103329A (en) | 2001-09-28 | 2001-09-28 | Manufacturing method for steel pipe for cylinder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010201508A (en) * | 2010-05-27 | 2010-09-16 | Tokyo Metal:Kk | Device for reducing coil diameter |
| JP2011255401A (en) * | 2010-06-09 | 2011-12-22 | Komatsu Ltd | Method of manufacturing steel pipe for cylinder |
| US10167538B2 (en) | 2014-02-04 | 2019-01-01 | Nippon Steel & Sumitomo Metal Corporation | Steel pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63168245A (en) * | 1986-12-27 | 1988-07-12 | Kawasaki Steel Corp | Warm spinning method for metastable austenitic stainless steel |
| JPH0366403A (en) * | 1989-08-05 | 1991-03-22 | Sumitomo Metal Ind Ltd | Drawing rolling method for metal pipe and device used for execution thereof |
| JPH0576950A (en) * | 1991-09-20 | 1993-03-30 | Mitsubishi Heavy Ind Ltd | Device for increasing pipeline wall thickness |
-
2001
- 2001-09-28 JP JP2001298967A patent/JP2003103329A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63168245A (en) * | 1986-12-27 | 1988-07-12 | Kawasaki Steel Corp | Warm spinning method for metastable austenitic stainless steel |
| JPH0366403A (en) * | 1989-08-05 | 1991-03-22 | Sumitomo Metal Ind Ltd | Drawing rolling method for metal pipe and device used for execution thereof |
| JPH0576950A (en) * | 1991-09-20 | 1993-03-30 | Mitsubishi Heavy Ind Ltd | Device for increasing pipeline wall thickness |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010201508A (en) * | 2010-05-27 | 2010-09-16 | Tokyo Metal:Kk | Device for reducing coil diameter |
| JP2011255401A (en) * | 2010-06-09 | 2011-12-22 | Komatsu Ltd | Method of manufacturing steel pipe for cylinder |
| US10167538B2 (en) | 2014-02-04 | 2019-01-01 | Nippon Steel & Sumitomo Metal Corporation | Steel pipe |
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