JP3633373B2 - Welded steel pipe manufacturing equipment - Google Patents

Description

製管サイズ級の変更毎に、エッジベンドロール、フィンパスロール〜スクイズロールはクイックチェンジによるロール交換を行い、センターベンドロールおよびケージロールはロール外径兼用を行っている。このロール交換所要時間は１回当たり１０分程度である。また、オフラインでのロール調整所要時間は約３０分であり、オンライン調整していた当時の所要時間（約６０分）に比べ大幅な短縮をみた。通材中にスリップ等のトラブルはなく安定成形状態を維持できており、製品にへこみや疵は全く発生していない。
【００２６】
【発明の効果】
かくして本発明によれば、通材を円滑に行うことができ、材料にへこみやロール疵を発生させず、ロールの交換・調整に手間を要しない溶接鋼管製造装置が実現するという優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明装置の１例を示す全体のロール配置側面図である。
【図２】図１の本発明装置による成形過程を示す断面図である。
【図３】本発明におけるクイックチェンジ機構と組み合わせるエッジベンドロール構成を示す模式図である。
【図４】本発明におけるターンテーブル方式によるクイックチェンジ機構を示す平面模式図である。
【図５】本発明における異なる製管サイズ級に兼用可能なエッジベンドロール構成の１例を示す正面模式図である。
【図６】本発明におけるセンターベンドロール構成の１例を示す正面模式図である。
【図７】本発明におけるセンターベンドロール支持方式を示す側面模式図である。
【図８】（ａ） はフィンパスロール、（ｂ），（ｃ） はスクイズロールの構成説明図である。
【図９】本発明の駆動系配分方式の説明図である。
【図１０】溶接鋼管製造装置の従来例を示すロール配置平面図である。
【図１１】図１０の各矢示位置での断面図である。
【符号の説明】
ＢＤＲ 下分割ロール
ＣＢ センターベンドロール
ＣＲ ケージロール
ＥＢ エッジベンドロール
ＦＰ フィンパスロール
Ｍ１，Ｍ２，Ｍ３，Ｍ４ モータ
ＲＳＧ ロータリーシームガイドロール
ＳＱ スクイズロール
ＴＤＲ 上分割ロール
ＷＤ 溶接機
ｚ ロール軸
１ エッジベンドロールスタンド（現稼働スタンド）
１Ｎ エッジベンドロールスタンド（次稼働予定スタンド）
２ 第１センターベンドロールスタンド
３ 第２センターベンドロールスタンド
４ 第３センターベンドロールスタンド
５ 第４センターベンドロールスタンド
６ 第１フィンパスロールスタンド（現稼働スタンド）
６Ｎ 第１フィンパスロールスタンド（次稼働予定スタンド）
７ 第２フィンパスロールスタンド（現稼働スタンド）
７Ｎ 第２フィンパスロールスタンド（次稼働予定スタンド）
８ スクイズロールスタンド（現稼働スタンド）
８Ｎ スクイズロールスタンド（次稼働予定スタンド）
９ ロータリーシームガイドロールスタンド（現稼働スタンド）
９Ｎ ロータリーシームガイドロールスタンド（次稼働予定スタンド）
１０ 素管（帯板）
１１ ターンテーブル（上流側）
１２ ターンテーブル（下流側）
１３ スタンドベース
１４， １５， １６ 単一フレーム
１７ トルク伝達手段
２０Ｂ 素管底拘束部
２１Ｂ，２２Ｂ 素管側外曲げ部
２１Ｔ，２２Ｔ 素管側内曲げ部
３０Ｂ 素管側底外曲げ部
３１Ｔ，３２Ｔ 素管側底内曲げ部
４０Ｂ 素管底外曲げ部
４０Ｔ 素管底内曲げ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a welded steel pipe manufacturing apparatus.
[0002]
[Prior art]
A welded steel pipe is a steel pipe manufactured by rolling a steel strip so that its width is continuously rounded to form a raw pipe, and welding its seam. At present, the seam is electrically welded (resistance welding). ERW steel pipes are the mainstream.
As an apparatus for performing roll forming / welding, an apparatus shown in FIGS. 10 and 11 is disclosed in Japanese Patent Application Laid-Open No. 61-135428. In this device, the edge bend roll EB, the first to fourth center bend rolls CB1 to CB4, the first to third fin pass rolls FP1 to FP3, the welding machine WD, and the squeeze roll SQ are arranged in the order of material passing. In addition, a large number of cage rolls CR are arranged on both sides of the first to fourth center bend rolls CB1 to CB4. Reference numeral 10 denotes a raw tube (band plate). The welder WD is a high frequency welder.
[0003]
The processing procedure using this apparatus is as follows.
First, the end portion of the strip is bent with an edge bend roll EB (FIG. 11a), and then the first to third center bend rolls CB1 to CB3 are pressed while pressing the side portion of the strip with a cage roll CR. The boundary between the tube bottom and the tube side is gradually bent (FIGS. 11b, c and d), and then the tube bottom is bent using the fourth center bend roll CB4 and the cage roll CR (FIG. 11e). ), The whole is formed into a U-shaped cross section (FIG. 11f), and this is subjected to reduction molding with the first to third fin pass rolls FP1 to FP3 so that the side of the raw tube is projected and the end of the raw tube, The boundary portion between the pipe end and the side of the raw tube, the boundary between the side of the raw tube and the bottom of the pipe is bent and bent back so that the cross-sectional shape is close to a circle, and the seam consisting of both ends in the circumferential direction of the pipe 10 Melting with welder WD, pressurizing with squeeze roll SQ and joining Pressure) to.
[0004]
However, this apparatus has the following problems.
In the second and third center bend rolls, since they are twin-type split rolls, dents and roll wrinkles are likely to occur in the material at the lower split roll corner.
・ Center bend rolls are built in separate stands, so it takes a lot of work and time to change rolls.
In the second and third center bend rolls, it is necessary to change the interval between the lower divided rolls every time the pipe making size is changed even though there are cage rolls on both sides.
-Since at least three fin pass rolls are required, it takes a lot of work and time to change rolls.
[0005]
[Problems to be solved by the invention]
The present invention provides a welded steel pipe manufacturing apparatus that can smoothly pass materials, does not generate dents and roll wrinkles, and does not require labor for replacement and adjustment of rolls, in view of the above-described problems of the prior art. The purpose is to do.
[0006]
[Means for Solving the Problems]
The present invention relates to an edge bend roll for bending a strip end of a strip, and a strip strip to weld a welded steel pipe by continuously rolling and forming a strip to a base pipe. Multiple center bend rolls that sequentially bend the tube side and further from the bottom of the tube to the boundary between the tube bottom and the side, multiple fin pass rolls that make the tube cross-sectional shape closer to a circle, and seams before welding A rotary seam guide roll that restrains the seam, a welder that heats the seam to the welding temperature, and a squeeze roll that presses the seam in this order are arranged in this order. In a welded steel pipe manufacturing apparatus, a large number of cage rolls or cluster rolls that press the part between the first and second center bend rolls and the first fin pass roll are arranged on both sides of the feed line. Te,
Regarding edge bend rolls, the bottom is either an integral type or a constant width split type, the top is either an integral type, a constant width split type, or a variable thickness variable width split type, and the edge bend roll stand is replaced at once. It has a turntable type quick change mechanism that can be used, or a split type with variable diameter at the top and bottom, and the lower divided roll as a stepped roll whose roll diameter decreases toward the inside, and the curvature of each step corner is different, The upper split roll is provided with several kinds of curvature corresponding to the curvature of each step corner at the outer corner of the roll, and can be tilted in a plane perpendicular to the material direction through the roll axis.
Regarding the center bend roll, the first roll is divided into both upper and lower parts, the second and subsequent rolls are integrated into the lower part, the upper part is divided into the last one or two parts before, and the downstream side is integrated into the one part.
Support all the first or second and subsequent center bend rolls in a single frame, vertically or separately,
It is equipped with a quick change mechanism of the turntable method that can replace the fin pass roll stand and the rotary seam guide roll stand, or even the squeeze roll stand,
Regarding the edge bend roll, the first center bend roll, and the fin pass roll, at least the lower roll is a drive roll, and the upstream drive roll group including the edge bend roll and the first center bend roll and the downstream drive roll group including the fin pass roll are driven. Apart from the system,
The welder is a welded steel pipe manufacturing apparatus characterized by being a resistance welder, a laser welder, or a combined resistance / laser welder.
[0007]
In the present invention, “i-th” (i is a natural number) means “the i-th order of passing” and “last” means “the last-order of passing”.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side view of a roll arrangement showing an example of a welded steel pipe manufacturing apparatus (present apparatus) according to the present invention. As shown in the figure, the apparatus of the present invention includes an edge bend roll EB that bends the end of the strip 10 and the side of the strip 10 and further from the bottom of the strip to the bottom / side boundary of the strip (element A plurality of (upper and lower n sets) center bend rolls CB1 to CBn (n = 4 in FIG. 1) that sequentially bend a portion extending from the tube bottom portion to the tube side portion (n = 4 in FIG. 1), and make the tube cross-sectional shape closer to a circle. Plural (upper and lower m sets) fin pass rolls FP1 to FPm (m = 2 in FIG. 1), rotary seam guide roll RSG for restraining the seam before welding, welding machine WD for heating the seam to the welding temperature, and pressure seam 2 Squeeze rolls SQ that are arranged in this order, and a cage that presses the portion of the strip 10 extending from the raw tube end to the raw tube end / side boundary portion (boundary portion between the raw tube end portion and the raw tube side portion). Roll or cluster roll CR As a basic configuration, a roll arrangement structure in which a large number are arranged on both sides is provided.
[0009]
The cage roll or cluster roll is arranged from the first center bend roll entry side to the first fin pass roll entry side as shown in FIG. 1 (a), or the second center bend roll entry as shown in FIG. 1 (b). It arranges from the side to the first fin pass roll entry side. The fin pass roll is composed of an upper roll with fins and a lower roll without fins.
[0010]
According to this apparatus, the strip is formed into a circular tube through an intermediate shape as shown in FIG.
That is, first, the edge of the strip is bent by an edge bend roll into a curvature substantially equal to the final arc curvature in anticipation of the springback (FIG. 2EB).
Next, the side portion of the raw tube is bent by the first center bend roll (FIG. 2CB1). This bending curvature is preferably about 40% of the squeeze roll caliber curvature. When the cage roll or the cluster roll CR is arranged in this material passing section, the pressing to the raw tube end / side boundary by the cage roll or the cluster roll CR is also applied.
[0011]
Next, the second and third center bend rolls constrain the rolling tube side / bottom boundary portion, and the fourth center bend roll constrains the bottom portion of the raw tube, while the edges arranged on both sides of these rolls are aligned. By pressing the end / side boundary of the tube with a plurality of cage rolls or cluster rolls (12 in FIG. 1a, 15 in FIG. 1b) that are constraining rolls, the tube side / bottom boundary is The base tube bottom is bent to a curvature equal to or slightly larger than the final arc curvature (FIG. 2CB2 to CB4), with a curvature larger than the final arc curvature.
[0012]
Subsequently, in the material passing section from the fourth center bend roll exit side to the fin pass roll entry side, the raw tube end / side boundary is pressed by the cage roll to make the cross-sectional shape of the raw tube into an oval shape (FIG. 2 CRout).
As shown in FIG. 2FP1, the tube having the oval cross section is formed by reduction with a first fin pass roll, and the tube end / side boundary portion es and the tube tube bottom / side boundary portion bs are further excessively formed. The pipe end e is bent moderately, and subsequently pressed by a second fin pass roll as shown in FIG. 2FP2, and the base pipe side part s is projected outward to have a curvature substantially equal to the final arc curvature. At the same time, the base tube bottom portion b and each boundary portion are bent back to a curvature close to the final arc curvature.
[0013]
As can be seen from the above forming procedure, in the example of the present invention shown in FIG. 1, one set of fin pass rolls can be reduced compared to the conventional example shown in FIG.
The device according to the present invention achieves the above object by adding the following means to the above basic configuration. Although FIG. 1 shows an example where n = 4 and m = 2, the present invention is effective when n and m are plural (2 or more), respectively.
(1) The edge bend roll is configured as described in ( i ) or ( ii ) below.
( I ) The bottom is either an integral type or a constant width split type, the top is either an integral type, a constant width split type, or a variable thickness variable width split type, and the edge bend roll stand can be replaced at once. A turntable quick change mechanism is provided.
( Ii ) The upper and lower rolls are divided into variable-diameter variable widths, the lower divided rolls are stepped rolls having a roll diameter that decreases toward the inner side, and the curvature of each step corner is different. Several kinds of curvatures corresponding to the curvature of each step corner are provided continuously, and the roll shaft can be tilted in a plane perpendicular to the material direction.
[Reason for ( i ) ] If importance is attached to the simplification of the structure of the edge bend roll stand, as shown in FIG. 3, the lower roll of the edge bend roll is preferably an integral type or a constant width split type. The upper roll is preferably an integral type or a constant width split type as the lower roll, but if necessary, the split roll and the left and right split rolls can accommodate a change in tube thickness (about 1 to 10 mm). )) That can move in the roll axis direction, that is, a split type with variable thickness.
[0014]
If this is the case, it is necessary to replace the current roll set with the next roll set suitable for the new pipe size class every time the pipe size class (outer diameter class) is changed. However, there is a problem that the roll adjustment is troublesome and productivity is lowered, and such a problem is solved by providing a turntable type quick change mechanism capable of batch replacement of the edge bend roll stand.
[0015]
This quick change mechanism, for example, as shown in FIG. 4, replaces an online current operation stand (edge bend roll stand 1) and a next operation scheduled stand set up offline (edge bend roll stand 1N) by a turntable method. configured to. That is, a turntable 11 having two standby fields that are point-symmetric with respect to the point O1 is disposed at a predetermined offline position corresponding to the online upstream side so as to be able to turn around the point O1, and is placed at one of the standby fields. Set up the next scheduled stand 1N and wait. At the time of replacement, the current stand 1 is pulled out to the other side of the waiting area, and the turntable 11 is turned 180 ° to change the position of one and the other of the waiting area. Bring online. According to this, roll replacement is completed in a very short time of about several minutes, and workability is improved because roll adjustment can be performed off-line.
[0016]
In FIG. 4, 2 to 5 are first to fourth center bend roll stands, 6 and 7 are first and second fin pass roll stands, 9 is a rotary seam guide roll stand, 8 is a squeeze roll stand, N The next operation scheduled stands and 12 and 13 are downstream turntables and stand bases, respectively, which will be described later. The same or corresponding parts as in FIG.
[Reason for ( ii ) ] On the other hand, if it is difficult to secure the installation space for the quick change mechanism, the structure of the edge bend roll stand itself will be somewhat complicated. can do.
[0017]
That is, for example, as shown in FIG. 5, the edge bend roll is divided into upper and lower parts, and the left and right divided rolls change the pipe outer diameter (the outer diameter combined ratio D _max / D _min is about 1.2 to about 3). A type that can move in the axial direction by the corresponding amount This type is referred to as a variable diameter variable width division type in distinction from the variable thickness variable width division type. However, if the pipe manufacturing size class changes, not only the bending position but also the bending amount (curvature) changes, so that the above measures alone cannot cope. Therefore, the left and right lower divided rolls BDR are stepped rolls whose roll diameter decreases toward the inner side, and the curvatures R1, R2 of the respective step corners are changed according to the pipe manufacturing size class. In addition, several curvatures R1 ′ and R2 ′ corresponding to the curvatures of the stepped corners of the stepped roll are connected to the corners on the outer ends of the left and right upper split rolls TDR. 5 in order to make the corresponding curvature surfaces of the corner and the lower corner of each other (R1 ′ surface and R1 surface in one tube size class, R2 ′ surface and R2 surface in another tube size class) face each other. As shown in half, the roll axis z of the upper split roll TDR is configured to be tiltable in a plane perpendicular to the material direction. In this example, the number of stages of the lower split roll is two per side, but may be three or more.
[0018]
Thus, one edge bend roll stand can be used for two or more kinds of different size class pipes, so that the frequency of roll replacement can be reduced.
(2) For the center bend roll, the first roll is divided into the upper and lower parts, the second and subsequent rolls are integrated into the lower part, and the upper part is divided up to the last one or two before, and the downstream side is integrated into the integrated part. And
[Reason] Regarding the center bend roll, the first roll may be divided into the upper and lower parts as in the conventional case, but the second and subsequent lower rolls are integrated so as not to cause dents and wrinkles in the material. The second and subsequent upper rolls may be of a split type as before, but the final or further one upper roll is an integral type because it is exclusively for bending the inner surface of the bottom of the element tube.
[0019]
Such a center bend roll configuration for n = 4 is shown in FIG. 6 together with the cage roll. The first center bend roll CB1 in FIG. 6 (a) is divided into the upper and lower sides and does not accompany the cage roll CR, the upper roll is divided into two split rolls having inner tube side bent portions 21T and 22T on the left and right, and the lower roll is placed on the left and right In addition to the outer tube-side outer bent portions 21B and 22B, a three-part roll having an inner tube bottom restraint portion 20B in the center. The second and third center bend rolls CB3 and CB4 in FIGS. 6B and 6C are divided into two split rolls in which the upper roll has base tube side bottom inner bent portions 31T and 32T on the left and right sides, and the lower roll is a single. The final roll 4B is a single roll having a base tube side bottom outer bent portion 30B, and the final fourth center bend roll CB4 in FIG. 6D is a single roll having a single base tube bottom inner bent portion 40T. The lower roll is an integral roll having a single base tube bottom bent portion 40B, and the second to fourth center bend rolls CB2 to CB4 are accompanied by cage rolls CR on both sides.
(3) All the first or second and subsequent center bend rolls are supported by a single frame, collectively in the vertical direction or separately in the vertical direction.
[Reason] With respect to the center bend roll, in order to speed up the roll exchange, it is preferable to support all the rolls in a single frame so that they can be attached and detached at a time. However, if the upper and lower rolls are supported by a single frame, the weight increases and the crane hoisting height at the time of replacement also increases, so if the allowable load or hoisting height of the crane at the factory is insufficient, the upper roll group and the lower roll group It is also preferable to support each of them in a separate single frame for each group. Further, since the first roll is driven, it is also preferable that the support by the single frame is applied to the second and subsequent roll groups except for the first.
[0020]
These center bend roll support systems are shown in FIG. In FIG. 7, 14, 15 and 16 are single frames, (a) all-up and bottom-up support, (b) all-roll up-and-down support, (c) second and subsequent up-and-down support, (d) Indicates support separately from the second roll up and down. In addition, the same code | symbol is attached | subjected to FIG. 1 and an equivalent part, and description is abbreviate | omitted.
(4) Provided with a turntable quick change mechanism capable of exchanging a fin pass roll stand, a rotary seam guide roll stand, or a squeeze roll stand.
[Reason] As shown in Fig. 8 (a), the fin pass roll is composed of an upper roll with fins and a lower roll without fins. In order to speed up the roll replacement work, a quick change mechanism that can replace the fin pass roll stand at once is provided. The quick-change mechanism, as in the case of the edge bend roll, it configures the turn table method. Also, as shown in FIGS. 8B and 8C, for example, the squeeze rolls have a hole shape that is close to the final shape of the product with the left and right or upper and lower rolls. It needs to be exchanged for something. Therefore, it is more efficient and preferable that the fin pass roll stand and the squeeze roll stand are configured to be exchanged together by the same quick change mechanism.
[0021]
For example, as shown in FIG. 4 described above, this quick change mechanism is offline with the online operation stand (first and second fin pass roll stands 6 and 7, rotary seam guide roll stand 9 and squeeze roll stand 8). The set up next operation scheduled stands (first and second fin pass roll stands 6N and 7N, rotary seam guide roll stand 9N and squeeze roll stand 8N) are installed on the same type of stand base 13 by the turntable method. It configured to exchange. That is, a turntable 12 having two standby fields that are symmetrical with respect to the point O2 is disposed at a predetermined offline position corresponding to the downstream side of the online line so as to be able to turn around the point O2, and is placed at one of the standby fields. The stand base 13 on which the next operation scheduled stands 6N, 7N, 9N, and 8N that have been set up are placed on standby. At the time of replacement, the stand base 13 on which the online active stands 6, 7, 9, 8 are installed is pulled out to the other side of the waiting area, and the turntable 11 is turned 180 ° to change the position of one and the other of the waiting area, The stand base 13 on which the next operation scheduled stands 6N, 7N, 9N, and 8N that have been waiting in one of the waiting areas is installed online.
(5) The edge bend roll, the first center bend roll, and the fin pass roll are at least the lower roll as the drive roll, and the upstream roll group consisting of the edge bend roll and the first center bend roll and the downstream roll group consisting of the fin pass roll are: Separate drive system. The drive system includes a power source such as a motor and torque transmission means such as a link, a gear, and a universal joint. FIG. 9 is an explanatory diagram of this drive system distribution system, wherein M1 to M4 are motors, 17 is a torque transmission means, and the same or corresponding parts as in FIG.
[Reason] In order to smoothly pass the material, at least the lower roll of the edge bend roll EB, the first center bend roll CB1, and the fin pass roll FP (FP1, FP2) is the drive roll, and the edge bend roll EB and the first bend roll EB The upstream drive roll group consisting of one center bend roll CB1 and the downstream drive roll group consisting of fin pass rolls FP1, FP2 need to be separated from each other. If even one of these requirements is lacking, slip will occur locally and the molding stability will be lowered, and the material will easily wrinkle.
[0022]
In particular, even when the edge bend lower roll, the first center bend lower roll, and the fin pass lower roll are all driven by the same drive system, the proper range of the material speed ratio between the upstream side and the downstream side is the pipe making. Since it differs depending on the size, it is difficult to keep the material passing speed ratio within an appropriate range in accordance with the change of the pipe making size, and it is difficult to sufficiently maintain the molding stability and prevent the generation of wrinkles. Therefore, it is necessary to drive the upstream drive roll group composed of the edge bend roll and the first center bend roll and the downstream drive roll group composed of the fin pass roll by separate drive systems.
[0023]
In addition, in order to further stabilize the formability of a hard-to-form material such as stainless steel, which is likely to cause roll wrinkles, and an ultra-thin material, it is desirable that the upper roll be a drive roll. Further, as shown in FIG. 9B, EB, CB1, FP1, and FP2 may be provided as separate drive systems.
In addition, the second to final center bend rolls and cage rolls, even if they are used as drive rolls, are not significantly different from the case of non-drive rolls in terms of the smooth threading material, and only increase the maintenance load. It is good to do.
(6) The welding machine is a resistance welding machine, a laser welding machine, or a combined resistance / laser welding machine.
[Reason] The welding machine only needs to be able to rapidly heat the raw pipe seam to the welding temperature (about 1500 ° C. or higher), including a resistance welding machine using a resistance heating method (direct current method and / or induction method), Any laser welding machine using a laser heating method is suitable. Moreover, you may comprise combining these suitably. Other high energy beams (electron beam, plasma beam, etc.) can be used instead of the laser.
[0024]
In the present invention, the squeeze roll is not particularly limited as long as it is a roll that forms a substantially circular through-hole type, and may be constituted by two rolls as shown in FIGS. Three rolls and four rolls may be used. Moreover, what is necessary is just to determine suitably whether a squeeze roll is made into a drive roll or a non-drive roll.
[0025]
【Example】
A welded steel pipe manufacturing apparatus having the requirements of the present invention is used to manufacture an electric resistance welded pipe having a pipe manufacturing size (outer diameter) of 25.4 to 76.3 mm. The wall thickness range is 0.6 to 3 mm. The equipment specifications are shown below.

Each time the pipe size class is changed, the edge bend roll, fin pass roll to squeeze roll are exchanged by quick change, and the center bend roll and the cage roll are also used as the outer diameter of the roll. This roll exchange time is about 10 minutes per time. Also, the time required for offline roll adjustment was about 30 minutes, which was a significant reduction compared to the time required for online adjustment (about 60 minutes). There is no trouble such as slip during the threading, and the stable molding state can be maintained, and no dents or wrinkles occur in the product.
[0026]
【The invention's effect】
Thus, according to the present invention, it is possible to smoothly pass the material, and the excellent effect of realizing a welded steel pipe manufacturing apparatus that does not generate dents and roll wrinkles in the material and does not require labor for replacement and adjustment of the roll is realized. Play.
[Brief description of the drawings]
FIG. 1 is a side view of an entire roll arrangement showing an example of an apparatus according to the present invention.
FIG. 2 is a cross-sectional view showing a molding process by the apparatus of the present invention shown in FIG.
FIG. 3 is a schematic diagram showing an edge bend roll configuration combined with a quick change mechanism according to the present invention.
FIG. 4 is a schematic plan view showing a quick change mechanism using a turntable method according to the present invention.
FIG. 5 is a schematic front view showing an example of an edge bend roll configuration that can be used for different pipe making size classes in the present invention.
FIG. 6 is a schematic front view showing an example of a center bend roll configuration according to the present invention.
FIG. 7 is a schematic side view showing a center bend roll support system according to the present invention.
FIGS. 8A and 8B are configuration explanatory views of a fin pass roll and FIGS. 8B and 8C, respectively.
FIG. 9 is an explanatory diagram of a drive system distribution method according to the present invention.
FIG. 10 is a roll arrangement plan view showing a conventional example of a welded steel pipe manufacturing apparatus.
11 is a cross-sectional view taken at each arrow position in FIG.
[Explanation of symbols]
BDR Lower split roll CB Center bend roll CR Cage roll EB Edge bend roll FP Fin pass roll M1, M2, M3, M4 Motor RSG Rotary seam guide roll SQ Squeeze roll TDR Upper split roll WD Welding machine z Roll shaft 1 Edge bend roll stand (Current operation stand)
1N edge bend roll stand (next operation scheduled stand)
2 1st center bend roll stand 3 2nd center bend roll stand 4 3rd center bend roll stand 5 4th center bend roll stand 6 1st fin pass roll stand (current operation stand)
6N 1st fin pass roll stand (stands for next operation)
7 Second fin pass roll stand (current operation stand)
7N 2nd fin pass roll stand (next operation scheduled stand)
8 Squeeze roll stand (current operation stand)
8N squeeze roll stand (stands for next operation)
9 Rotary seam guide roll stand (current stand)
9N Rotary Seam Guide Roll Stand (Next Operation Scheduled Stand)
10 Elementary tube (band)
11 Turntable (upstream side)
12 Turntable (downstream side)
13 Stand bases 14, 15, 16 Single frame 17 Torque transmitting means 20B Raw tube bottom restraint portion 21B, 22B Raw tube side outer bent portion 21T, 22T Raw tube side inner bent portion 30B Raw tube side bottom outer bent portion 31T, 32T Base tube side bottom bending portion 40B Base tube bottom bending portion 40T Base tube bottom bending portion

Claims (1)

In order to produce a welded steel pipe by continuously rolling a steel strip into a raw pipe and manufacturing a welded steel pipe, an edge bend roll for bending the raw pipe end of the strip, Is a plurality of center bend rolls that sequentially bend the part from the bottom of the tube to the boundary between the tube bottom and the side, a plurality of fin pass rolls that make the tube cross-sectional shape close to a circle, and a rotary that constrains the joint before welding A seam guide roll, a welder that heats the seam to the welding temperature, and a squeeze roll that presses the seam are arranged in this order, and the part from the end of the strip to the boundary between the end and the side of the end In the welded steel pipe manufacturing apparatus in which a number of cage rolls or cluster rolls to be pressed are arranged on both sides of the threading line from the first or second center bend roll entry side to the first fin pass roll entry side,
Regarding edge bend rolls, the bottom is either an integral type or a constant width split type, the top is either an integral type, a constant width split type, or a variable thickness variable width split type, and the edge bend roll stand is replaced at once. It has a turntable type quick change mechanism that can be used, or a split type with variable diameter at the top and bottom, and the lower divided roll as a stepped roll whose roll diameter decreases toward the inside, and the curvature of each step corner is different, The upper split roll is provided with several kinds of curvature corresponding to the curvature of each step corner at the outer corner of the roll, and can be tilted in a plane perpendicular to the material direction through the roll axis.
Regarding the center bend roll, the first roll is divided into both upper and lower parts, the second and subsequent rolls are integrated into the lower part, the upper part is divided into the last one or two parts before, and the downstream side is integrated into the one part.
Support all the first or second and subsequent center bend rolls in a single frame, vertically or separately,
It is equipped with a quick change mechanism of the turntable method that can replace the fin pass roll stand and the rotary seam guide roll stand, or even the squeeze roll stand,
Regarding the edge bend roll, the first center bend roll, and the fin pass roll, at least the lower roll is a drive roll, and the upstream drive roll group including the edge bend roll and the first center bend roll and the downstream drive roll group including the fin pass roll are driven. Apart from the system,
The welded steel pipe manufacturing apparatus, wherein the welding machine is a resistance welding machine, a laser welding machine, or a combined resistance / laser welding machine.

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