CN1026867C - Multifuncition straight seam welding tube forming technology and forming machine - Google Patents

Abstract

The present invention relates to a technology for forming a high-frequency butt welded pipe and a forming unit adapting to the technology. A mode of the combination of a passive full row roller and a vertical roll is adopted, and a special bore shape system and a specific roller set system are used for producing a thin-walled steel pipe with high quality of D/t smaller than or equal to 100 and a steel pipe with the wall thickness of D/t larger than or equal to 9; the diameter range is from phi60 to phi168 millimeters, and the wall thickness is from 1.5 to 10 millimeters. The forming unit comprises few machines; thus, the forming unit is convenient to adjust; before fine formation, one roller is suitable for all machines with all specifications. The roller has the advantages of few preserved rollers, long service life and little investment, and the processed steel pipe has the advantages of good quality and high precision.

Description

Multifuncition straight seam welding tube forming technology and forming machine

The shaping machine set that the present invention relates to a kind of high-frequency straight seam welded pipe moulding process and adapt with technology by adjusting each frame of shaping machine set, can not only be produced the thin-wall steel tube of high-quality D/t≤100, and can produce the thick walled steel tube of D/t 〉=9.

Since the eighties, the kind of welded tube, quality have had development at full speed, and launching competition with seamless pipe aspect high material, heavy wall, the high-quality, captured the field of some seamless pipe, as high-pressure delivery pipe, oil well pipe, mesohigh boiler tube, pump line, oil cylinder pipe etc., therefore, novel welded tube forming machine that adapts with it and the new also corresponding development of deformation method.Welded tube forming machine kind in the world today is numerous and diverse, have double-roller type, four-roller type, entirely arrange roller, partly arrange roller, edger roll and be deformed into main, box, crawler type etc., but total seeing can be divided into two classes.One class is traditional make-up machine, is with the active horizontal frames roller molding machine alternate with standing roller frame.The common feature of this class make-up machine is that the sortie according to make-up machine goes to form a groove, and distinguishes the method for forming with the horizontal section of pipe, and curved edge method, center curvature method, circumference bending method, single radius, two radiuses etc. are arranged.It improves pipe quality with the quality of pass design.The common drawback of this class make-up machine is that the length of deformed area is long, general asynchronous region length L 〉=50Dmax, and the milling train sortie is too much, and the shared property of roller instrument is poor, and roll is wide in variety, investment is big, and the roll friction consumes big, so power loss is big.This class make-up machine is applicable to the production of medium wall thickness tubule, produces general purpose steel pipe.The most Welded Pipe Plant of China all belong to this moulding milling train.Another kind of is modern new-type make-up machine, the seventies is to early eighties, high-frequency straight seam welded pipe develops to heavy caliber, high strength direction, and each advanced country energy that all costs a lot of money removes to study the deformation rule of steel pipe moulding in the world, removes to design shaping machine structure according to desirable deformation rule.Thereby produced modern new-type make-up machine.Wherein most popular is row's roller (Cage Roll) make-up machine.With regard to row's roller, divide Tuo Lunsi row roller, Zhang Zhihui row roller, Huo Xi row roller, Man Lesiman row's roller and full row's roller again, partly arrange variety classes such as roller.Their common feature is: the pony roll with a few composition rows replaces horizontal roller and edger roll, rule by natural moulding makes strip plastic deformation, so reduced the movement locus of being with strip edge edge in steel relief area and the spring-go on the same length in locally-shaped district, eliminate the peak value that the edge stretches, improved quality of tube blank steel.It is big to arrange the shared property of roller simultaneously, shaping and deformation district weak point, small investment, easy to adjust, power loss is little, therefore used widely.But this make-up machine is because row's roller diameter is less, and insufficient rigidity when producing thick-walled pipe is its maximum defective.Generally can only produce the steel pipe of D/t 〉=15.U.S. Pat-3,323,341st, a typical case of this class moulding also is a contrast prior art of the present invention.Along with the development of welded tube to the high material direction of heavy wall, the eighties make-up machine changes roll-type forming into by popular row-roll forming process again, has strengthened roller diameter, has overcome the shortcoming of row's roll structure insufficient rigidity.But it is too much to have produced the mill stand number again simultaneously, and the roller instrument is too much, invests bigger shortcoming.

The objective of the invention is to overcome as far as possible the shortcoming and defect of existing welded tube forming technology and shaping machine set, deformation rule according to the steel pipe moulding, special pass schedule is proposed, for realizing that this new welded tube technology designs the multi-functional welded tube forming unit of a cover, not only can shorten the length of deformed area with this shaping machine set and moulding process, roll before the shared precisive shaped, the investment of saving equipment and roller instrument, reduce roll changing time, and light-wall pipe made its pipe edge tensile force minimum, non-flanged wrinkle phenomenon, the quality of assurance light-wall pipe.Adopt special deformation method simultaneously, guarantee the suitable stable welding V-type angle and the depth of parallelism at pipe edge, make it to have desirable strip edge edge cross section case of bending, and then guarantee the quality of production of the high material steel pipe of heavy wall.And the production description is extensive, not only can produce the common welding thin-wall steel tube of D/t≤100, and can produce heavy wall steel pipes such as D/t 〉=9 high pressure boiler tubes, pump line, oil cylinder pipe.Also can make some equipment on sizing mill increases, in order to produce shape tubes such as square pipe, square type pipe, ellipse pipe.So be referred to as multi-functional welded tube forming unit.

Main contents of the present invention are as follows:

Is the deformation rule of pipe according to high-frequency straight seam welded pipe from strip plastic deformation, has designed the pass figure as Fig. 2, and the distortion situation of being with the horizontal section of steel from No. 1 corresponding each rolling mill of pass to 10 pass has been described.In this moulding process, each passage the (the 1st in first three rolling mill, 2, the cross-sectional deformation of steel band 3 roads) adopts single radial deformation, adopt special mode of texturing in each passage of seven rolling mills, it is characterized in that the 4th middle steel band only mid portion adopt single radial deformation, and the marginal portion is constant, the 5th, six, in seven each passages, the mid portion of steel band is deformed into the semicircle with required pipe radius gradually, and only there is small deformation the marginal portion, the 8th, nine, in ten each passages, the radius of mid portion is indeformable, and the marginal portion is deformed into the radius with required pipe gradually, thereby finishes cross section by the distortion of flat rubber belting to circle.Linear deformation adopts deformation method, but it goes down the hill to measure h=(0.4～1.20) D wherein D be the pipe diameter, can be for ease of this formula is described referring to Fig. 3 pipe linear deformation state.

This cover pass belongs to combined pass, in the preformed frame, first to the 3rd is adopted the brake forming of single radius circumference basically, the 4th middle steel band only mid portion adopts the flexural deformation of single radius circumference, it is constant that the 3rd road shape is kept in the marginal portion, the 5th, six, seven each passage, and steel band is through flexural deformation, the intermediate portion has bent to desired radius of curvature, that is to say that the semicircle of core has been finished distortion in this three roads pass.Each established slight curves of 1/4 width of band steel two edges is to enter precisive shaped to have created necessary bite condition, and the band steel has become up-small and down-big U type and entered the 8th pass again.Eight, nine, ten is the precisive shaped pass, can be clear that from Fig. 2, mainly be to carry out crimp this moment, the band steel is badly deformed from the U type is the O type, thereby finish the moulding process of pipe, reach the desirable requirement of high-frequency welding, the non-flanged wrinkle, the parallel contact of welding counterpart has stable V-type angle, can guarantee the requirement of high-quality welding.

The linear deformation of pipe, be that a notching curve is adopted in the distortion vertically of pipe bottom, in the pipe moulding, be referred to as deformation method, or down-hill method moulding, in various pipe shaping machine set, the amount of going down the hill there be different following the example of, the present invention is defined as h=(0.4～1.2 to the amount of going down the hill) D, can reduce edge tensile stress about 20%, simultaneously to shortening asynchronous region length and reducing the distortion function and be of great benefit in this scope.

More than the cross section of band steel pipe base and the feature of linear deformation provide a level and smooth naturally material streamline to deformation process, can guarantee the high-quality of pipe moulding, thereby improve welding tube quality.

A kind of high-frequency straight seam welded pipe shaping machine set provided by the present invention designs according to above moulding process, and it comprises four of preformed frames, three of intermediate deformation frames, three of precisive shaped frames, ten rolling mills altogether.Because the equipment that relates to is more, for ease of being illustrated clearly and completely, introduces the accompanying drawing content earlier.Then summary of the invention and embodiment are introduced in the lump.

Fig. 1 is the side view of multi-functional welded tube make-up machine of straight seam group, and NO1-NO10 is the shelf number of each frame among the figure.

Fig. 2 is the pass figure of moulding process of the present invention, shown from the NO1 pass to each sortie of NO10 pass the distortion situation of the horizontal section of band steel.

Fig. 3 has shown that for the linear deformation figure of band steel to pipe the strip width center line prolongs the track of axial deformation curve, and L is an asynchronous region length among the figure, and h is the amount of going down the hill.

Fig. 4 is a NO1 frame 1-1 section horizontal roller schematic diagram, roll position and strip plastic deformation situation when its left half of view is this pass production minimum gauge, roll position and strip plastic deformation situation when right half of view is this pass production maximum specification.

Fig. 5 is a NO2 frame 2-2 section edger roll schematic diagram, position when its left half of view is adjusted to production maximum specification pipe for this pass, position when its right half of view is adjusted to production minimum gauge pipe for this pass wherein is the position when producing centre all size pipe shown in the double dot dash line.

Fig. 6 is a NO3 frame 3-3 section edger roll schematic diagram, the position of edger roll when double dot dash line is for production all size pipe among the figure.

Fig. 7 is a NO4 frame 4-4 section horizontal roller schematic diagram, the position of roll when having shown this pass production maximum specification pipe, and double dot dash line has shown the change situation of lower roll when producing all size pipe among the figure.

Fig. 8 is a NO5 frame 5-5 section edger roll schematic diagram, has shown the position of roll in this pass, the edger roll position when its left side is the production minimum gauge, the edger roll position when its right side is the production maximum specification.

Fig. 9 is a NO6 frame 6-6 section edger roll schematic diagram, has shown the position of roll in this pass, the edger roll position when its left side is the production minimum gauge, the edger roll position the when right side is the production maximum specification.

Figure 10 is a NO7 frame 7-7 section edger roll schematic diagram, has shown the position of roll in this pass, and its edger roll position when the production minimum gauge, left side, its right side are the edger roll position when producing specification.

Figure 11 is the schematic layout pattern of row's roller.

Figure 12 is the profile of row's roller import department cross section pony roll 1, the position of pony roll when its left side is minimum gauge, the position of pony roll when its right side is maximum specification.

Figure 13 is the profile of row cross section, roller exit pony roll 12, the position of pony roll when its left side is minimum gauge, the position of pony roll when its right side is maximum specification.

Figure 14 is a NO8 frame 101-10 section horizontal roll schematic diagram, has shown the roll structure of precisive shaped frame.

Introduce the structure and the arrangement of this shaping machine set below in detail.

The preformed frame is four, i.e. NO1-NO4 frame, and its first is general duo mill, driving shaft 32,51 is supported by bearing housing 61,39,64,41, can move up and down in frame 30,38.Top roll 35 by key 33 and overlap 34,36 be fixed on the axle 32 on.Lower roll is made up of limit wing roller 56,44 and intermediate calender rolls 50 3 parts.In both sides wing roller 56 and 44, cone bearing 52 is housed, bearing 52 is fixed on the axle sleeve 54, link to each other with limit wing roller by gland 57, be installed on the axle 51 by a plurality of collars 58,59,60,61,62, change collars and can form the roll of various different sizes, thereby make the band steel bend to the NO1 pass of different size in the quantity of wing roller both sides, limit.Intermediate calender rolls 50 is fixed on the axle 51 by key 55, because the effect of cone bearing makes two limit wing rollers 56 and 44 be driven roll, so reduced relative friction between band steel and the roll.By adjust the position of limit wing roller with collars, can be applicable to the requirement of plurality of specifications with a milling train to the NO1 pass.Fig. 4 right side is installed in the inboard of limit wing roller 44 with a plurality of identical collars 45,46,47,48,49, so the NO1 pass when going for maximum specification.

The NO2 pass is made up of five rolls as can be seen from Figure 5, and they are two respectively and go up 85, two edge-on rollers 75 of 87,88, one lower support rollers of depress roller and 86.These rolls all are driven rolls.Last depress roller 87 and 88 is installed in respectively on screw 67 and 70, cone bearing 66 and 72 are equipped with in its inside, by gland 82,68,83 sealings, screw 67,70 is installed on the two-way leading screw 164, leading screw 164 is installed on watt seat 63 by brasses 65 and 73, watt seat is fixed on (see figure 1) on the roller frame 89, and this roller frame is installed on the frame of first horizontal mill.See Fig. 1 by regulating leading screw 84() can adjust roller frame 89 up and down, when the two-way leading screw 64 of rotation, last depress roller 87 and 88 just can merge or separate, and so just can adapt to the requirement of various different size passes.Edge-on roller 86 and 75 is installed on roller seat 161 and 74, roller seat is installed in (see figure 1) on the vertical roll unit 3, regulate edge-on roller 86 with 75 on different width positions by special gear and screw mechanism, just can adapt to various different size pipes in the requirement of NO2 pass.Lower support roller 85 is a stationary roll, can not adjust.To all shared this roller of all different sizes, bearing 79 is housed in the roller, by gland 81,77 sealings, be installed on the axle 78, axle 78 is fixed on the roller seat, and roller seat is installed on the standing roller frame 3.The position of going up depress roller 87, edge-on roller 86 and lower support roller 85 when half of visible pass is adjusted to production maximum specification pipe from the left side of figure.The position of going up depress roller 88, edge-on roller 75 and lower support roller 85 when the right half of then visible pass of figure is adjusted to production minimum gauge pipe, double dot dash line has also shown the relative position and the formed pass of edge-on roller 75 when producing various different size pipe among the figure.

From the section of the visible NO3 frame of Fig. 6, the adjustment position of all size pipe edger roll in the NO3 pass just, the position of three rollers when left half of figure has shown minimum gauge, the position of edger roll when right half of figure has shown maximum specification.This pass bends to needed radius of curvature by a pair of passive edger roll 127 and 132 with pipe.Edger roll 127 and 132 is installed on roller frame 126 and 128 by axle, axle sleeve and cone bearing respectively, the roller frame is installed on the edger roll base 121 by pressing plate 122, two edger rolls by leading screw 124 and 134 can adjust its spacing from, thereby be adapted to the requirement of different size pipe deformation with a kind of roll.This structure is easy to adjust, and rigidity and stability, and move steadily the stressed back of edger roll, and roll wear is little, and the life-span is long.

From the section of the visible NO4 frame of Fig. 7 horizontal roll, reflected the change situation of lower roll when producing all size pipe simultaneously.Top roll 102 is fixed on the driving shaft 101 by key 103 and axle sleeve 100,117. Driving shaft 101 and 108 is supported in the frame 99,104 by bearing housing 98,105,109,95, can move up and down.Lower roll is made up of three parts, i.e. two edge rollers 97 and 107, one intermediate calender rolls 116.Cone bearing 93,118 and thrust bearing 94,119 are housed in two edge rollers, by gland 96,113 it is sealed in the edge rollers, be installed on the axle 108 by cover group 120,115 and roller shell 91,112, change the roll that cover group 120,115 quantity in edge rollers 97,107 both sides can form different size, to be applicable to the NO4 pass of different size.Intermediate calender rolls 116 is fixed on the axle 108 by key 92, and it cooperates clamping band steel to send forward with top roll 102.Two edges roller 97 and 107 are the passive parts of lower roll, and they are different with the intermediate calender rolls rotary speed, but linear resonance surface velocity is all consistent with band steel movement velocity.

5-5,6-6,7-7 section from Fig. 8, Fig. 9, the visible Fig. 1 of Figure 10, the i.e. position of edging roll and the shape of corresponding pass in NO5, NO6, three intermediate deformation frames of NO7.They are adapted to produce wall thickness is pipe more than 6 millimeters.The position that strip plastic deformation situation when its left side is the production minimum gauge and edger roll should be adjusted, the position that strip plastic deformation situation when its right side is the production maximum specification and edger roll are adjusted.Band steel mid portion is deformed into the semicircle with required pipe radius gradually in these three intermediate deformation frames, edging roll adopts the approximate involute roll shape of two circular arcs, edger roll seat 130,137(Fig. 8), 145,160(Figure 10 150(Fig. 9), 155) except can moving up and down, can also be by certain angle rotation, because roll shape is an involute, has just guaranteed can be adapted to a kind of edger roll of specification the needs of different bilge radius.When changing specification, only need adjust the position and the angle of edger roll by given data, and needn't roll change.Pipe is supported by a horizontal support rollers (139,152,162) in the bottom of each frame.To guarantee the go down the hill index curve relation of amount of its linear deformation.

For the distortion of light-wall pipe in NO5, NO6, three intermediate deformation frames of NO7, arrange roller entirely by one group of little spacing and realize, see Figure 11.Full row's roller comprises 12 pairs of pony rolls, and each fitly is arranged on the bigger crossbeam of rigidity by different separately angles pony roll, and crossbeam can be adjusted arbitrarily up and down neatly, thereby has guaranteed that a cover row roller can be adapted to the needs of all specification steel pipe moulding.The principle of full row's roller of the present invention is identical with other forms of row's roller principle, but has its unique advantage: one, spacing between the 12 pairs of pony rolls is compact more, help the straight line distortion, they are two years old, the variation of pony roll angle is got by the variation of roller seat angle, by Figure 12 (profile of the 1st pair of pony roll of import department) and Figure 13 (profile of the 12nd pair of pony roll in exit) as seen, pony roll 197,198 respectively by axle 195,200 are installed in roller seat 196, on 199, roller seat 196,199 again respectively by key 209,206 and pressing plate 194,201 are installed in crossbeam 190, on 205, crossbeam is by axle 193,203,214,222 are contained in frame 191 respectively, 204,212, on 214, frame is installed among Fig. 1 on the edger roll frame 7 and 9 by limit pin.Can adjust the angle of pony roll by the angle that changes roller seat 196,199.Not only processing and manufacturing is easy for row's roller of this structure, and is stressed reasonable, and convenient to the replacing after indivedual pony rolls damages.Pony roll, roller seat, the controlled position of crossbeam when left half of view has shown processing minimum gauge pipe among this two figure.Pony roll, roller seat, the controlled position of crossbeam when right half of view has shown processing maximum specification base.

Precisive shaped Duan Yousan frame band move about guide ring double-roller type initiatively the horizontal roller frame form, promptly NO8, NO9, three frames of NO10 among Fig. 1 are finished the distortion in these three passes.The effect of three horizontal roller only is the first half of crooked pipe, makes its Cheng Yuan.The profile of seeing milling train among Figure 14 figure has reflected the roll structure of precisive shaped section.Lower roll is merged by bolt 250 by two and half rollers 233,249 and forms, and is installed on the axle 253 by key 231.Top roll is by a left side half roller 238, guide ring 241, right half roller 243 and sliding bearing 240, spacer 242, and is synthetic by bolt 239 connections, is installed on the axle 247 by key 235.Guide ring 241 is passive, and roll is driven by the key on the axle, so having solved the pipe that linear differential caused scratches, its more important role is the edge of being with steel to be processed make its distortion, parallel contact for straight weld welding seam counterpart, and be that good condition is created at stable V-type angle, to guarantee weldquality.

Adopt multi-functional ERW technology and shaping machine set shown in the present, promptly adopt passive full row's roller and edger roll combines and mode, with special pass schedule and special roller group system, can produce the thin-wall steel tube of high-quality D/t≤100 and the thick walled steel tube of D/t 〉=9,168 millimeters of diameter range φ 60～φ, wall thickness is 1.5～10 millimeters, and the highest material reaches≤552MPa, diameter tolerance ± 0.1 millimeter.Be applicable to structural tube, water gas pipe, vehicle transmission central siphon, high pressure boiler tube, high-pressure delivery pipe, oil field sleeve pipe and oil pipe etc.This technology uses the shaping machine set frame inferior few, adjust easyly, all sorties all are suitable for all specifications with a kind of roll before the precisive shaped, thus the roller deposit less, life-span length, small investment, the little moon shape of band steel is bent stronger antijamming capability arranged, the tube quality of being processed is good, the precision height.

Claims (5)

1, a kind of high-frequency straight seam welded pipe moulding process, the cross-sectional deformation of the steel band of each passage adopts single radial deformation in its first three rolling mill, back each passage of seven rolling mills adopts special mode of texturing, it is characterized in that the 4th middle steel band only mid portion adopt single radial deformation, the marginal portion is constant, the 5th, six, in seven each passages, the mid portion of steel band is deformed into the semicircle with required pipe radius gradually, and only there is small deformation the marginal portion, the 8th, nine, in ten each passages, it is indeformable that the semicircle of branch is sloughed off in the centre, the marginal portion is deformed into the radius with required pipe gradually, thereby finish cross section by the distortion of flat rubber belting to circle, the down-hill method distortion is adopted in linear deformation, and the amount of going down the hill is h=(0.4～1.2) D, and wherein D is the pipe diameter.

2, use the high-frequency straight seam welded pipe shaping machine set of the described moulding process of claim 1, comprise four of preformed frames, three of intermediate deformation frames, three of precisive shaped frames, it is characterized in that second and third frame of preformed is passive standing roller frame, first, fourth frame is an active horizontal roller milling train, the roll barrel length of each frame of horizontal roller milling train can reach the body of roll of requirement length by the combination of several collars of same thickness, the intermediate deformation frame is made up of three passive edger rolls and lower support roller, and the edger roll position can be adjusted.

3, unit according to claim 2 is characterized in that the both sides wing roller of lower roll of the horizontal roller milling train of said preformed frame is separable, and two limit wing rollers are driven roll, has a plurality of for the collars of adjusting in the middle of the right and left wing roller.

4, unit according to claim 2, it is characterized in that said intermediate deformation frame edger roll roll shape for the approximate involute switch of two circular arcs, roll by mechanical device can about, about adjustment, and can the position rotation, the adjustment by roll location is applicable to the intermediate deformation of the non-light-wall pipe welded tube of all size.

5, unit according to claim 2, the edger roll that it is characterized in that said intermediate deformation frame is that one group of little spacing that is used for light-wall pipe is arranged roller entirely, all on the row of the being contained in roller crossbeam, crossbeam is connected by key with roller seat each group pony roll, adjusts the angle of pony roll by the angle of change roller seat.

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