JPH03180212A - Manufacturing device for welded steel pipe and its handling method - Google Patents

Abstract

PURPOSE:To simultaneously change the upper and lower rolls and to improve the working rate by setting the upper rolls of a 1st - a 4th center blend rolls to the one housing and the lower rolls of a 2nd - the 4th center bend rollers to the common sub base plate. CONSTITUTION:On the manufactureing device for welded steel pipe, only the lower rolls D... of the 1st to the 4th center bend rolls 1CB-4CB are provided at the respectively individual roll stands 21..., and the center base roll stands 21... of the 2nd to the 4th are fixed to the one common sub base plate 50. And the upper rolls U are also provided to one common housing 23. Therefore, for changing the upper and lower rolls U..., D..., by changing the housing 23 and the common sub base plate 50, the four upper rolls U and three lower rolls D are simultaneously changed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to an apparatus for producing /8 welded steel pipes and a method for handling the same.

``Prior art and problems to be solved by the invention'' Welded steel pipes, in which steel strips are continuously roll-formed to form a blank pipe, and the butted joints are /8 in contact, are already well known, and at present , joints L] are electrically welded (resistance welded), and electric resistance welded steel pipes are now mainstream.

By the way, one of the roll forming methods in this case is l) the entire width bending process in which the whole blank pipe is rolled up while sequentially bending the slope as a whole, and the forming equipment belonging to this method is 11 and 12 (Japanese Unexamined Patent Publication No. 45-29896) and Torrance Corporation (U.S. Pat.
No. 8897). In the figure, 100 is a preforming roll, +02, 104, 106108 is a breakdown roll, 110... is an inner roll, EF is an edge forming roll, CR is a cane roll, IF, 2F, 3F are fin pass roll,
SQ is a squeeze roll.

However, these devices have ) The number of forming rolls is large.

11) The restraining force on the strip is weak and the strip tends to roll.

…) The range of dual use of rolls is narrow when changing pipe size.

iv) The molded shape of the raw tube tends to become a discontinuous polygon due to the influence of the rolls (see Figure 16).

(2) Since the bending process cannot be performed sufficiently in the rough and intermediate forming processes, the load in the final stage of fin pass forming is large, and in practice, at least three stages of fin pass rolls are required.

There are drawbacks such as.

Therefore, in order to improve these shortcomings, we first developed the
A molding apparatus (Japanese Unexamined Patent Publication No. 135428/1983) shown in FIG. 18 was developed. This device operates from the upstream side to the bottom.
To 'l'l, edge forming roll EF, 1st to 4th center bend roll IC8, 2C83C [3, 4
C [3 and a large number of cage rolls CR arranged on both sides of these rolls..., a plurality of fin pass forming IF, 2F,
3F, squeeze rolls SQ are arranged in sequence, and the edge part of the raw tube of the strip is bent with the enojiforming roll EF. 3 Bending the boundary between the side part of the raw pipe and the bottom part of the raw pipe using the CB and cage roll CR... Figure 18, c, d), 4th
Cef 9- Hair 1: Bending the bottom part of the raw tube with roll 4CB and cage roll CR (Fig. 18 e) to form it into a 0-shaped cross section (Fig. 18 r), and then pass this through the fin pass. Rolls IF, 2F, and 3F are used to press down and form the side part of the raw pipe, and the edge part of the raw pipe, the boundary between the edge part of the raw pipe and the side part of the raw pipe, and the side part of the raw pipe and the bottom part of the raw pipe are formed. This involves bending and unbending the boundary between the two parts, melting the joint with a welder, and upsetting the joint with a squeeze roll SQ to join the joint.

However, in this case as well, in practice, ■ the first to fourth center bend rolls ICB2CB,
3CB and 4CB are for bending only the boundary between the side part of the raw pipe and the bottom part of the raw pipe, or the bottom part of the raw pipe, and are arranged within a range of about 173 mm in width at the center of the strip plate (
FIGS. 18b-d) And since the first to third center bend rolls ICB and 2CI3.3CB are twin-type split rolls, their contact area with the strip is small, and therefore,
Even if all center bend rolls are driven, the feeding torque from the rolls to the strip is not sufficiently transmitted, and the strip does not move smoothly.

Furthermore, if all the center bend rolls are driven, the device will become larger and it will be difficult to secure a space for installing the cage rolls, leading to an increase in equipment costs.

■ The second and third center bend rolls 2C33CB are twin-type split rolls (see Figures 19 and 20. However, in Figure 19, when the pipe manufacturing size is small,
Figure 0 shows the case where the pipe size is large. ) In particular, in the case of a split roll of the lower roll, dents and roll flaws occur in the strip due to a part of the roll corner.

■ 1st to 4th center bend roll Ic82C8,
Because 3CB and 4CB have independent stand structure,
It takes a lot of effort and time to change the rolls.

■Second and third center bend rolls 20B'.

Although the lower roll of 3CB has cage rolls on both sides, it is necessary to change the roll interval every time the pipe size is changed, and roll adjustment takes time and effort.

■ Since at least three stages of fin pass rolls IF, 2F, and 3F are required, it takes a lot of effort and time to change the rolls.

There are problems such as.

The present invention takes these matters into full consideration and provides excellent Igt
This paper aims to provide an apparatus for manufacturing FI steel pipes and a method for handling the same.

"Means for Solving the Problem" In order to achieve the above object, the invention of claim 1 involves continuously roll-forming a strip to form a blank pipe, and forming a welded steel pipe with 18 butted joints in contact with each other. In the manufacturing equipment, from the upstream side of the roll forming process to the downstream full 4, an edge pen roll that compresses and bends from the edge part of the raw pipe to the boundary with the side part of the raw pipe, and a roll that restrains the side part of the raw pipe to roll down and performs bending. The first center bend roll, which bends the raw pipe, presses down and restrains the boundary between the side part of the raw pipe and the bottom part of the raw pipe, and applies lateral pressure to the raw pipe from both sides to bend the raw pipe from the boundary part to the bottom part of the raw pipe. A second to fourth center bend roll for bending the bottom part, a plurality of cage rolls arranged on both sides of these rolls, and a first center bend roll for further pressure forming the raw pipe.
and a second fin pass roll arranged in a second order, and providing driving means for at least the edge bend roll, the first center bend roll, and the first and second fin pass rolls,
Further, the welded steel pipe is characterized in that all upper rolls of the first to fourth center bend rolls are set in one housing, and all lower roll stands of the second to fourth center bend rolls are set in one common sub-base plate. It's in the manufacturing equipment.

The invention of claim 2 resides in the invention of claim 1qA, wherein both the upper and lower rolls of the edge bend roll and the first center bend roll are divided rolls whose width can be adjusted freely, and the second to fourth center The lower rolls of the bend rolls are combined into an integrated roll with a caliber shape that fits the maximum pipe diameter of the common range, and each upper roll of the second to third center bend rolls is a split roll whose width can be adjusted freely, and the fourth The upper roll of the center bend roll can be used as an integrated roll, and the cage roll can be moved diagonally! It is equipped with adjustable features.

Further, the invention of claim 3 provides an f6ffi steel pipe in which the first to fourth center bend rolls are sequentially arranged in the intermediate stroke of roll forming, and all the upper rolls of these center bend rolls are set in one housing. In the manufacturing equipment, by replacing the housing, the first to fourth
A method of handling a welded steel pipe manufacturing apparatus characterized by replacing all upper rolls of a center bend roll at once.

Furthermore, in the invention as set forth in claim 4, all the lower rolls of the second to fourth center bend rolls are set on one common sub-base plate that can freely stand the lower rolls of the second to fourth center bend rolls. 8-jointed steel pipe t characterized by replacing the lower roll and common sub-base plate all at once.
This is in the method of handling the manufacturing equipment.

Note that the edge bend roll may or may not drive the upper roll, and the second to fourth center bend rolls may
Only each lower roll may be driven.

``Function'' Because of the above configuration, when manufacturing steel pipes, it is only necessary to feed a strip of a predetermined size from the upstream side to the bottom 'l & (ii). The area from the edge of the raw pipe to the boundary with the side part of the raw pipe is compressed and bent using rolls.The bending process here should preferably be approximately equal to the final forming arc.

U, the side portion of the raw tube is pressed down and subjected to a bending process by the first center bend roll. Bending here,
Just a little bit is fine.

■, With the second and third center bend rolls, the size of the raw pipe is 1.
The boundary between the bottom part and the bottom part of the raw pipe is restrained by pressure, and at the same time,
A plurality of cage rolls arranged on both sides apply lateral pressure to both sides of the raw tube, and the boundary portion is bent. The bending here should be more extreme than the bending of the final formed arc.

IV, the bottom part of the raw pipe is compressed and restrained by the fourth center bend roll, and at the same time, pressure is applied to both sides of the raw pipe by a plurality of cage rolls arranged on both sides, and the bottom part of the raw pipe is pressed down. processed. The bending here should preferably be an arc of the final molding and an opening or excessive bending.

■The first and second fin pass rolls further remove the raw tube (
The part (which has an oval cross-section through the eruption process up to (■) above) is pressed down, and the side parts of the raw pipe are jutted out to the sides, and each of the boundary parts and the edge parts of the raw pipe are bent and bent as appropriate.
After being bent back, the tube becomes nearly circular.

(2) After that, the joints are appropriately welded and the shape is adjusted to form a steel pipe.

"Example" 1 to 9 show an apparatus according to the invention.

As shown in Fig. 1, this device consists of an edge bend roll EB, 1st to 4th center bend rolls ICB, 2CB, 3CB4CB, 12th center bend roll to the 4th center bend roll. A plurality of cage rolls CR..., first and second fin pass rolls IF, 2F, rotary seam guide roll R3G, high frequency 4 welding machine HF W, and squeeze roll SQ are arranged in sequence on both sides over the lower skin. There is.

More specifically, as shown in FIGS. 2 to 9, among the various rolls mentioned above, the edge bend roll EB, the first to fourth center rolls IcB, 2C13, 3CB
, 4 CB, first and second fin pass roll IF,
2F consists of seven rolls U and a lower roll D, and a plurality of cage rolls CI'll..., and the squeeze roll SQ is a pair of left roll and right roll. And the first to fourth center bend rolls IcB, 2CB, 3C8,
4CB has a certain range of dual uses. for example,
If we are to manufacture a steel pipe with an outer diameter of 22.22 mm~G+] and 5u+, as shown in Figure 10, ■ The common range is from 43.33 negative S to 60.5, and the three roll groups of ■, ■, and ■ are used.

Note that there is a side roll S between the first and second fin path rolls.
Although D is placed, it may be gon.

Also, among these rolls, edge bend roll EB
The lower roll D, the upper part of the first center bend roll IcB.
Lower rolls U, D, 1st and 2nd fin pass rolls I
Upper and lower rolls U of F and 2F.

D has a driver! ! 127... is lectured. Specifically, the roll axis is connected via a universal joint to
It is mechanically connected to the A source. In addition, if necessary, the upper roll U of the edge bend roll EB, the second to fourth
It is also possible to drive the lower rolls D, . . . of the center bend rolls 2CB, 3CB, 4CB, and the squeeze roll SQ.

The upper and lower rolls of Dibend Roll EB are split rolls, allowing the width to be adjusted according to the pipe manufacturing size, and rolling restraint from the raw pipe edge of the strip to the boundary with the raw pipe side part. Then, at the same time as the strip is fed, the edge portion or boundary portion of the blank tube is bent approximately equal to the final forming arc in anticipation of springback.

As shown in FIGS. 3 and 7, the first center bend roll ICB connects the lower roll D to relatively wide left and right members 1.
2.13 and a relatively narrow intermediate member 11, and the upper roll U is divided into two rolls with left and right members 14 and 15, each of which is a width adjusting means 22.
22 so that the width can be adjusted according to the pipe manufacturing size, and the side part of the raw pipe of the strip plate is pressed down and simultaneously fed and bent slightly. The degree of bending here is such that the caliber radius at the midpoint of the range of tube manufacturing sizes (tube outside diameter) that can be used for this roll is approximately 2.5 times the caliber radius of the squeeze roll SQ that fits this. It is enough.

2nd to 4th center bend rolls 2C8, 3CI3.
4CB, as shown in Fig. 4, Fig. 5, Fig. 8 (Fig. 9), each lower roll D... is an integral roll I6, and these integral rolls are used for a certain range of pipe manufacturing sizes. However, as mentioned above, the dual use range is 22.22
m ~31.03 mm, ■31.03 am ~43
．． 33 am, ■43.33 m ~ 60.5 sm 3
If so, prepare three integral rolls for ■ to ■, and the integral roll for ■ has a caliber shape that fits 31.03 n, and the integral roll for ■ , 4
It is formed into a caliber shape that fits 3.33 m5, and the integral roll for ① is formed into a caliber shape of 60.5 mm. In other words, it is formed into a caliber shape that matches the maximum outer diameter of the 14 common ranges.

In addition, the second and third center bend rolls 20B and 3C
As shown in Fig. 4 and Fig. 8 (Fig. 9), B is a split roll with two members (17° and 18°) for the upper rolls U and U, respectively, on the left and right, and the width can be arbitrarily adjusted according to the pipe manufacturing size. (Fig. 8 shows the case where the pipe production size is small, and Fig. 9 shows the case where the pipe production size is large.) The fourth center bend roll 4CB is arranged as shown in Fig. 5. As shown, the upper roll U is an integral roll 28.

Therefore, the second and third center bend rolls 2CB, 3
The CB rolls down and restrains the boundary between the raw pipe side part and the raw pipe bottom part of the strip plate, and the fourth center bend roll 4CB rolls down and restrains the raw pipe bottom part, and is arranged on both sides of these rolls. With a plurality of cage rolls CR..., CR..., the boundary part of the raw pipe is bent more excessively than the bending of the final forming arc, and the bottom part of the raw pipe is bent to the same degree or excessively as the final forming arc. do.

The cage rolls CR..., CR... are the second center bend rolls 2 as shown in FIGS. 2, 4 to 6.
4th center bend roll 4CI3 from upstream position of CB
On both sides up to the downstream position of the
A total of 12 rolls are arranged, and by applying appropriate side pressure to the raw pipe from both sides, they work together with the second to fourth center bend rolls to remove the raw material from the boundary between the side part of the raw pipe and the bottom part of the raw pipe. The tube up to the bottom part is sequentially bent as described above.

II and the second fin path roll IF, 2F are equipped with an upper roll with fins and a lower roll without fins,
The first fin pass roll IF rolls and forms the raw pipe which has become oval in cross section in the previous process, and forms the boundary between the raw pipe edge part and the raw pipe side part, and the raw pipe side part and the raw pipe bottom part. The boundary part of the raw pipe is further bent excessively, and the raw pipe work and the nozzle part are bent appropriately.Then, the second fin pass roll 2F continues to press-form the raw pipe to form the raw pipe side part. It is bent outward and bent to almost the same shape as the final formed arc, and at the same time, each boundary portion is bent back to near the final formed arc.

The rotary seam guide roll R3G includes an upper roll with fins and a lower roll without fins, and the position, angle, etc. of the rolls can be adjusted, and the raw pipe is adjusted to the regular 78 connection position.

The high frequency welding machine HFW is a type of resistance welding machine, and uses a welding electric magic to heat and melt the joints of raw pipes.

The squeeze roll SQ (FIG. 1) is equipped with a pair of left and right rolls, and presses the raw tube from both sides to upset and join the molten joint, and also shapes the joined tube into a circular shape.

By the way, as shown in FIGS. 1 and 2, the above-mentioned strip hend roll EB, first and second fin pass rolls IF, 2F, and rotary seam guide roll R3G are
The lower rolls U..., D... are each mounted on an independent roll stand 19... so that the rolls can be replaced, and the squeeze roll SQ is equipped with the left and right opening rolls on the roll stand 20.
It is equipped with roll exchangeable.

In addition, the first to fourth center bend rolls ICB, 2C
As shown in FIGS. 1 and 2, B, 3CB, and 4CI3 are equipped with only the lower roll D... on independent roll stands 21... and the second to fourth center bend roll stands. 21... are fixed to one common sub-base plate 50, so that the common sub-base plates can be replaced at once. The upper roll U... is also provided in one removable housing 23, which is common to all the rolls, so that the rolls can be replaced. Therefore, when replacing the upper and lower rolls UD, it is possible to replace the housing 23 and the common sub-base plate 50, thereby making it possible to replace both or all three at once.

As shown in FIGS. 2 and 4UfIJ to FIG. 6, the cage roll CR... is equipped with three l-zones on each roll stand 24..., and each roll stand has three A common diagonal advance/retreat adjustment means 25 is provided. In this case, adjustment may be performed mainly on the middle roll. Note that this adjustment means allows the cage roll to be used for all sizes of metal tubes. As for the angle, it is sufficient to set it appropriately in accordance with the position.

Next, an experiment related to the above-mentioned apparatus will be explained.

fi+ Prototype & 4 tubes (see Figure 10) Gai Ryo 22
．． 22~60.5m (2) Strip plate used 1x1''1 0.8~3.0 Quantity - Material ■ Jun i1M steel 5S41 equivalent ■ Stainless steel S LJ S 304+31ffil to 4th center bend roll IcB2CB, 3C8, 4C[3 common range (see No. 101.￥I) ■Steel pipe outer diameter 22.22~31.03 Shaft■
31.03~43.33 Axis ■ 4
3.33 to 60.5 @ Todoroki (The rolls are available in three sizes, from ■ to ■.) In this experiment, the intended purpose was achieved without any problems.

Especially when changing (adjusting) pipe size and replacing rolls,
Less than half of the conventional Il: What can be done in number and time r1
I was able to confirm it.

“Effect of invention J According to the present invention, the following effects are achieved.

b) All the upper rolls of 7 rolls to the 1st to 4th centers are placed in one housing, so that all the upper rolls can be replaced at once, which greatly reduces the effort and time required to replace the rolls. Operation rate can be improved.

By setting the Kaneko roll stands for the second to fourth center bend rolls on one common sub-base plate, the lower rolls can be replaced all at once, greatly reducing the effort and time required to replace the rolls. I can do it,
It is possible to improve the operating rate.

c) Edge bend rolls are used to cover from the edge of the raw pipe to the boundary with the raw pipe side parts, and the first center bend roll is used to cover the raw pipe side parts, and the second to fourth center bend rolls are used to cover a large number of parts on both sides. Since the boundary between the side part of the raw pipe and the bottom part of the raw pipe and the side part of the raw pipe are sequentially +toed using cage rolls, the bare neck can be formed into an oval cross-section before it is made into a fin bath roll. The pipe is pressed down with a fin bath roll and the side part of the raw pipe is made to protrude in the measured direction, so it can be bent accurately without becoming a polygon. In addition, the work load in fin pass forming is reduced, two stages of fin pass rolls are sufficient, and the number of rolls can be reduced throughout, making the entire Z assembly compact.

2) Edge bend rolls are used to connect the boundary between the edge part of the raw pipe and the side part of the raw pipe. Since the boundary with the pipe bottom part or the bottom part of the raw pipe is restrained, and the cage rolls are used to restrain the raw pipe edge part or the raw pipe side part, the strip plate is restrained by F over almost the entire width direction. Nari, no: Not only does it not cause misalignment or rolling, it also does not cause edge waves, making it possible to stabilize the molding process.
It is possible to improve the quality.

E) An edge head roll that restrains the edge part of the raw pipe or the adjacent boundary part, a first center bend roll that restrains the side part of the raw pipe, and first and second rolls that restrain the upper and lower parts of the raw pipe.
By providing a driving means for the fin pass roll, the belt plate receives torque transmission over a wide range in the width direction, and can be smoothly advanced. Further, since the second to fourth hinterhend rolls do not drive the upper roll, the device can be made more compact, the cage roll installation space can be secured without any problem, and the equipment cost can be reduced.

f) Since each lower roll of the second to fourth center bend rolls is an integral roll with a caliber shape that fits the maximum pipe diameter in the common range, it is possible to prevent dents and roll flaws in the strip caused by a part of the roll corner. Moreover, if the pipe production size is within a certain range, there is no need to adjust the roll interval when changing the pipe production size, and the effort and time required for roll adjustment is not required.

1.) Since the cage roll is equipped so that it can be adjusted diagonally forward and backward, it can be used for all sizes of metal pipes, and moreover, only one element is required for the adjustment, making it easy and quick to adjust. Moreover, the structure can be simplified.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of an apparatus for producing 18 welded steel pipes according to the present invention, FIGS. 2 to 11 illustrate embodiments of the present invention, and FIG. 2 is a side view of the apparatus for the roll forming process. Figure 3 is a front view of the first center bend roll, Figure 4 is a front view of the third center bend roll, Figure 5 is a front view of the fourth center bend roll, and Figure 6 is a front view of the cage. A plan view of the roll, FIG. 7 is an enlarged front view of the main part of the first center bend roll, and FIGS. 8 and 9 are views of the second to fourth center bend rolls for small pipe manufacturing size and large pipe manufacturing size. FIG. 10 is a graph, FIG. 11 to FIG. 20 show a conventional example, FIG. 11 is a plan view of the configuration of the first conventional example, and FIG. 12 is a view of the same side. FIG. 13 is a perspective view of the second conventional example, and FIG. 14 is an enlarged sectional front view of the main part.
Figure 13 is a sectional view taken along the line XrV-XIV, Figure 15 is
Fig. 3 is a sectional view taken along the line XV-xV, Fig. 16 is an explanatory diagram of the main parts of the first conventional example and the second conventional example, Fig. 17 is a plan view of the configuration of the third conventional example, and Fig. 18 a , b, .-f are the first
FIG. 7 is a diagram showing the main parts along lines a-a, bb-b, and f-f, and FIGS. 19 and 20 are enlarged front views of the main parts of the center bend roll on the same side. EB... Edge bend roll IcB... 1st center bend roll 2CB... 2nd center bend roll 3CB... 3rd center bend roll JCB... 4th center bend roll 1F.
・First fin pass roll 2D...Second fin pass roll SQ...Squeeze roll SD...Side roll R2O...Rotary seam guide roll) I F W
...High frequency/8 welding machine

Claims (4)

[Claims] (1) In a welded steel pipe manufacturing device that continuously roll-forms strips to form a raw pipe and welds the butted joints, the process is performed from the upstream side of the roll forming process to the downstream side, from the raw pipe edge to the raw pipe. An edge bend roll that performs bending while compressing down to the boundary with the side part, a first center bend roll that performs bending while restraining the side part of the raw pipe, and a boundary between the side part of the raw pipe and the bottom part of the raw pipe. Second to fourth center bend rolls are arranged on both sides of these rolls to compress and restrain the bottom part of the raw pipe and apply lateral pressure to the raw pipe from both sides to bend the boundary part or the bottom part of the raw pipe. A plurality of cage rolls and first and second fin pass rolls for further pressure forming the raw pipe are arranged in sequence, and at least the edge bend roll, the first center bend roll, and the first and second fin pass rolls are provided with driving means. In addition,
A welded steel pipe manufacturing apparatus characterized in that all upper rolls of the first to fourth center bend rolls are set in one housing, and all lower roll stands of the second to fourth center bend rolls are set in one common sub-base plate. . (2) The edge bend roll and the upper and lower rolls of the first center bend roll are both split rolls whose width can be adjusted freely, and the lower rolls of the second to fourth center bend rolls are compatible with the maximum pipe diameter in the common range. The upper rolls of the second and third center bend rolls are made into split rolls whose width can be adjusted freely, and the upper roll of the fourth center bend roll is made into an integrated roll that can be used for both purposes. 2. The welded steel pipe manufacturing apparatus according to claim 1, wherein the welded steel pipe manufacturing apparatus is equipped to be able to be adjusted diagonally forward and backward. (3) A welded steel pipe manufacturing apparatus in which first to fourth center bend rolls are sequentially arranged in the middle stage of roll forming, and all upper rolls of these center bend rolls are set in one housing, wherein the housing 1. A method for handling a welded steel pipe manufacturing apparatus, characterized in that all upper rolls of the first to fourth center bend rolls are replaced at once by replacing the upper rolls of the first to fourth center bend rolls. (4) Set all the lower roll stands of the 2nd to 4th center bend rolls on one removable common sub-base plate, and replace all the lower rolls of the 2nd to 4th center bend rolls together with the common sub-base plate at once. A method of handling a welded steel pipe manufacturing device characterized by: