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Roll body has round-cross-section groove with tangential transverse taps. Rolling of large-diameter pipes at minor reduction at anvil swage section is made possible by that the groove composed of working and idle parts, 210 and 150 degrees in length, has working part consisting of consecutive anvil swage parts composed of roll ledge in radius increasing by 85-90 mm, with crosswise tap angle varying over anvil swage length from 32-37 to 20-25 degrees, finishing section with permanent or smoothly increasing radius and permanent angle of crosswise tap and section of lengthwise tap with increasing cross-section and angle of crosswise tap increasing to the angle of crosswise tap of idling section. Note here that anvil swage length makes 0.57-0.58, that of finishing section makes 0.28-0.29, while that of angle of lengthwise tap makes 0.14-0.15 of total length of total length of roll working length. |
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Proposed process of making 265×22×13000±300 and 285×25×11750±50 mm pipe stock consists in using ESR hollow ingots-billets sized to 600xID.260×2050±50 and 600xID240.×2100±50 mm, respectively. Said ingots-billets are homogenised and heated in continuous furnace to ductility temperature. They are rolled at PRU 8-16'' with Pilger mill to rerolled pipe billets sized to 470xID.230×3550±50 and 480xID.240×3550±50 mm with rolling-out µ=1.71 and µ=1.66 and diameter reduction of Δ=21.7 and Δ=20.0%. The latter are heated without homogenisation to ductility temperature and rolled to commercial pipe billets sized to 285×42×13000±300 and 305×45×11750±250 mm with rolling-out of µ=4.03 and µ=3.62, diameter reduction of Δ=38.3 and Δ=35.4%, with machining allowance. Then, they are bored and turned to finished pipes. |
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Invention relates to metallurgy. This process comprises smelting of hollow ingots The latter are bored and turned to hollow ingots-billets Said ingots-billets are heated to ductility temperature Rolling of hollow ingots-billets at Pilger mills to commercial pipes with feeding of Pilger heads onto rider carbon rings Then, pipes are heat-treated, etched, repaired and subjected to ultrasound control. |
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Invention relates to production of pipes for extraction of gas and gas condensate in sulphur-bearing media. ESR process is used to smelt hollow 470×110×2700 or 430×105x×2700 mm ingots to be bored and turned to hollow 460×100×2700 and 420×95×2700 mm ingots-billets, respectively. Said ingots-billets are heated to ductility temperature and rolled at Pilger mill on taper mandrels to rerolled hot-rolled pipes. The latter are turned, bored and rolled at mill CPR to commercial oil-well tubing sized to 88.9×6.45×9000-10700 mm. Use of hollow ESR ingots allows reducing the metal input. |
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Invention relates to production of pipes for pipelines of boiler unit intermediate steam overheating. ESR process is used to smelt hollow ingots to be bored and turned to 720×ID.560×3200±50 mm-ingots. Ingots-billets are heated to ductility temperature and rolled at PRU 8-16'' with Pilger mill to commercial pipes at rolls with body diameter of 1150 mm and groove of 620 mm at diameter reduction of 11.4% and rolling-out μ of 2.01-2.29. |
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Preparation of esr ingots-billets from alloyed grades of steel and alloys to pilger pipe rolling Invention relates to pipe rolling. Solid or hollow ESR ingots-billets from alloyed steels or alloys are heated to ductility temperature. They are pierced at helical rolling stand. For rolling of produced sleeves, backing rings of carbon steels and conical sections are produced to design sizes. Sleeves and rider rings are heated. Fitted on mandrel are mandrel ring and backing wing with its cylindrical section to mandrel ring, and sleeve. Produced composed sleeve is rolled to re-rolled pipe with complete fed of Pilger head to alloy-free metal. |
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Pilger mill roll for hot rolling of 610×28-40 mm pipes Pipe forming roll has body with round-section path with tangential transverse tapers consisting of hammer section, finishing section, lengthwise taper section and idle section. Optimum reduction of blanks at hammer section is ensured by making the roll body composed of hammer section with central angle of 70° with cross-section decreasing by 74-104 mm depending on ESR sleeve and hollow ingot diameter, finishing section with central angle of 100°, lengthwise taper section with central angle of 40° and idle section with central angle of 150°. Note here that angles of transverse tapers at hammer section from zero point to 20-degrees-central angle are invariable and equal to 35°, at next hammer section with central angle of 50° with transition to finishing section with central angle of 10° they are smoothly decreasing from 35 to 22 degrees, at finishing section with central angle 90° they are invariable and equal to 22°, at lengthwise taper with transition to idle section with central angle of 20° they are smoothly increasing from 22 to 35 degrees, and, further, at idle section with central angle of 130° they are invariable and equal to 35°. |
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Prevention relates to production of rerolled "426×34×10500±250" mm pipes at PRU 8-16'' with Pilger mills from billets of titanium alloy GR 29. Ingots are cast in vacuum arc furnace and subjected to forging and turning to billets. Central hole is drilled in the billet to be schooped with Al2O3, heated in continuous furnaces to 1150-1180°C at the rate of 2.8-3.2°C/min with turn-over in 18-20 minutes through α=(190±10)°, held at ductility temperature at 4-3 openings of the furnace first zone for 25-30 minutes and turned over from 3rd opening into furnace pit. Billet is pierced at helical rolling mill to sleeves and rolled at Pilger mill to rerolled pipes. Process wastes are cut off by hot cutting saw and straightened at six-high cluster mills in two-three passes to curvature not over 6 mm over pipe length. |
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Hollow ESR ingots-billets are cast, heated to ductility temperature at Pliger mills on taper mandrels with the angle of generatrix inclination of mandrel axis α=2.7-3.1 minutes. Roll ring groove has reducing, squeezing and finishing sections, section of lengthwise taper section and idle section that make the roll pass. Finishing section has tangential tapers with 25-28° angles of oval, central parts of which being limited by radii equal to 1.10-1.12 of hot-rolled pipe radius. Said ESR ingots-billets at cast to different sizes with diameter-to-wall depth of 4.4-6.0. Pipe rolling at Pilger mills is performed with rolling-out µ of 1.6-6.2, larger sizes being related to smaller diameter pipes. |
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Hollow ingots sized to 470×110×2700 or 430×105×2700 mm are ESR cast. Said ingots are turned and bored to hollow ingots-billets sized to 460×100×2700 and 420×95×2700 mm. Said ingots-billets are heated to ductility temperature and rolled at Pilger mill on taper mandrels to rerolled hot-rolled pipes. The latter are turned, bored and rolled at mill "ХПТ" to commercial oil-well tubing sized to 114.3×6.88×9000-10700 mm. Use of hollow ESR ingots allows reducing the metal input. |
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Proposed mandrel comprises shank and working section with cross-section decreasing from the shank. Mandrel is increased owing to its production from steel of grades that features higher hardenability compared with that of steels "ШХ15" and "50ХФА". Note here that hardened ply on mandrel surface features depth making at least one third of its cross-section. |
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This process comprises heating of billets to ductility temperature, piercing at helical rolling mill to sleeves, rolling of the latter at Pilger mill to pipes, pipes gaging at sizer and air cooling. Billets are made of steel micro alloyed with vanadium from 0.02 to 0.07% and niobium of 0.01 to 0.03%, or titanium from 0.01 to 0.03% and aluminium from 0.02 to 0.05%. Ripe rolling is performed at sleeve feed to straining source of 15-20 mm for pipes with wall thickness of 10-15 mm and 20-25 mm for pipes with wall thickness of 15-20 mm. |
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Invention relates to production of composite mandrels of Pilger mills. Solid mandrel cores are made from mandrel rejects by their regrinding to produce lock part, working part and guide part. Working part consists of cylindrical and conical parts while guide part is composed of cylindrical part and end cone. Forged billets of EST ingots or billets produced from sound parts of 400-500 mm diameter mandrel rejects from "25Х2М1Ф" steel are heated to ductility temperature and pierced at helical rolling mill to sleeves. Said sleeve is fitted on said prefabricated structure till contact with lock cone to roll-and-knurl the sleeve on cores at Pilger mills. Thermal treatment of composite mandrel billets is carried out to produce 40-50 mm deep sorbite jacket on the surface. Then, said billets are machine to produce composite mandrels. |
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Proposed method comprises casting of hollow ESR ingots from "10ГН2МФА"-grade steel to size of 535×vn.250×3100+100 mm. Said ingots are subjected to anodic-mechanical cutting to get equal-length shell ring blanks. Said shell ring blanks are turned to diameter 520±1.0 mm. They are taper-bored in ID, taper small diameter making 257±1.0 mm while its larger diameter makes 265±1.0 mm. Said shell rings are sealed by steel "08Х18Н10Т". Bimetal ingot bottom part are removed to drill the 520±1.0×gr.265±1.0×1550±50 mm through central 100±1.0 mm diameter bore. After boring to 520±1.0×gr.265±1.0×160±1.0×1550±50 mm, bimetal ingots are heated to ductility temperature at pierced at helical rolling mill to sleeves sized to 540×вн.305×1640-1770 mm at 290 mm diameter mandrels. Said sleeves are rolled at Pilger mill in passes 383 mm of 271/272 mm mandrels with carbonaceous jar rings to rerolled pipes sized to 371×50.5×4600-4900 and 446×54×4700-5100 mm. Said rerolled pies are heat treated, straightened, bores and turned to commercial hot-rolled 279×36×4000-4300 mm pipes with plating layer depth of 7±2 mm. |
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Invention relates to metallurgy and can be used at pipe rolling unit 8-16'' with Pilger mills JSC CPRP. Pilger mill roll comprises working section and idle section of 220 and 140 degrees at 1150 mm diameter barrel. Working part comprises round-cross-section pass with tangential crosswise taper grooves. Pass length consists of the hammer in length of 0.36-0.37 of the total length of working section with angle of crosswise taper groove varying over the hammer length from 32-37 to 20-25 degrees in cross-section of transition to polishing section. Polishing section features the length of 45-0.46 of the entire length of working section. Besides, it features the angle of lengthwise taper groove making 0.19-0.20 of the working section total length. Roll hammer with central angle of 80 degrees, total reduction of sleeves and hollow ingots over diameter from 70 to 80 mm, comprises the pass with crosswise taper grooves decreasing from 35 to 22 degrees. It is divided into three sections with central angles α1=20, α2=25, and α3=35 degrees, with smooth distribution of reduction over diameter. |
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Invention relates to pipe rolling and can be used at production of rerolling pipes. Sleeves are rolled to rerolling pipes at PRU with Pilger mill, titanium allow stuck to roll body flanges to cut off process wastes, that is, Pilger heads not completely rolled and seed ends. Rerolling pipes are straightened at rolling temperature, turned and bored to commercial or rerolling pipes for further rerolling at cold-pilgering mills. Titanium alloy stuck to roll body flanges is removed by rolling the pipe of given size from carbon steel after rolling of n-amount of titanium-based alloys. Rerolled pipes feature higher surface quality. |
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Invention relates to pipe rolling and can be used at production of composite mandrels of Pilger mills. One-piece cores are made from continuously-cast billets or profiled special iron from carbon grades of steel. Said core is bored from one end to cut tight-hand thread while bulge shaped to truncated cone with larger base on core end is made at opposite end. Locking parts are made mechanically from mandrel rejects and forged pieces of steel "25Х2М1Ф" or steel resisting the impact effects to cut the thread at the end opposite the lock. Core and lock are screwed together to produce a prefabricated structure. Billets produced by forging or ESR casting are heated to ductility temperature and pierced at helical rolling mill to sleeved with ID larger than large bases of the core truncated cones by 15-20 mm. Said sleeve is fitted on said prefabricated structure till contact with lock cone to roll-and-knurl the sleeve on cores at Pilger mills. Thermal treatment of composite mandrel billets is carried out to produce 40-50 mm deep sorbite jacket on the surface. Then, said billets are machined to composite mandrels. |
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Invention can be used for production of seamless hot-rolled pipes from "15Х1М1Ф"- and "10Х9МФБ-Ш"-grade steels for pipelines of the steam intermediate overheating at boiler units. Hollow ESR ingots are bored and turned to hollow blanks sized to 670xvn.370x1650±50 mm, heated to ductility temperature and broached-rolled at cross-rolling mill to sleeves sized to 600xvn.590x3280-3480 mm. Sleeves are rolled at PRU 8-16'' with Pilger mills to commercial pipes sized to 610x28-32x4700-5400 mm. |
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Billets and ingots are heated to ductility temperature and pierced at helical rolling mill to sleeve billets. The billets are heated to ductility temperature and pierced and rolled at helical rolling mill to the sleeve billets. Sleeves are rolled at Pilger mill, dip-formed and Pilger head is smooth-rolled. Higher quality of pipes, durability of rolls and longer life of equipment are ensured by dip-forming of sleeves at rolling at roll rpm specified by definite mathematical relationship. The latter allows for roll radius, quantity of feeds, mean factor of advance metal and other factors. |
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Said billets are heated to ductility temperature and pierced at helical rolling mill to sleeve billets. Sleeves are rolled at Pilger mill, dip-formed and Pilger head is smooth-rolled at rolls. Round cross-section roll body has its pass with tangential angles, pass length being composed by hammer with central angle of 90-100°, finishing section with central angle of 70°, lengthwise exit angle with central angle of 40° and idle section with central angle of 150-160°. Higher quality of pipes, durability of rolls and longer life of equipment are ensured by dip-forming of sleeves at rolling at roll rpm specified by definite mathematical relationship. |
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Invention may be used on tube-rolling installations with pilgrim mills for rolling of pipes with size 377×9-16 and 426×9-18 mm. The roll of the pilgrim mill comprises along the barrel circumference a stream of round section with tangential transverse outlets, made of a serially arranged striker with an angle Θs=100°, formed by a radius of the roller ridge with increased value, a polishing section with an angle Θp=70°, an angle of the longitudinal outlet with an angle Θl.o.=40° and an idle section with an angle Θi=150°. The angle of the tangential transverse outlet on the striker from the point "0" to the beginning of the polishing one is made as gradually reducing from 35° to 20-22°. The polishing section has permanent or gradually increasing cross-section. The angle of the tangential transverse outlet on the polishing section is made permanent and is equal to 20-22°. The angle of the longitudinal outlet is made with gradually increasing tangential transverse outlets from 20-22 to 35° and increase of the calibre diameter by 12.2 mm, and the idle section is made with tangential transverse outlets equal to 35°. |
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Roll of a pilgrim mill comprises a stream of round cross section with tangential outlets along barrel circumference. The length of the stream is made from a serially arranged striker with an angle Θs=90°, a polishing section with an angle Θp=70°, an angle of a longitudinal outlet with an angle Θl.o.=40° and an idle section with an angle Θi=160°. The angle of the transverse outlet on the striker from the point "0" to the angle αs=(17-20)° is made as permanent and equal to the angle 35° of the transverse outlet of the idle section. On the section of the striker αs=(70-73)° the angle of the transverse outlet is made as gradually decreasing from 35° to (26-28)°. On the polishing section the angle of the transverse outlet is made as permanent (26-28)°, and on the angle of the longitudinal outlet and the part of the idle section as equal to Θl.o.+10°. The angle of the transverse outlet is made as gradually increasing from (26-28)° to 35°. |
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Method includes manufacturing of jackets from bars of electroslag steel of grade 10GN2MFA, manufacturing of cylindrical bushings from bars of electroslag steel of grade 08H18N10t and manufacturing of end rings from solid-cast stocks of carbon steel grades. In electroslag bars they drill through holes, then they heat them to plasticity temperature, stitched in a cross-rolling mill on mandrels into cartridges, which are rolled in a pilgrim mill into tube stocks. Tube stocks with size 535×vn.245×2600-2650 and 585×vn.240×1800-1850 mm from steel 10GN2MFA are bored and turned into cylindrical jackets-stocks with size 520±1.0×vn.265+1.0/-0×1300 and 570±1.0×vn.255+1.0/-0×1750 mm. Tube stocks with size 280×77×4000 and 270×82.5×3700 mm from steel 08H18N10T are bored and turned into cylindrical bushings with size 265+0/-1.0×52.5×1300 and 255+0/-1.0×57.5×1750 mm. Solid-cast stocks of carbon steels with diameter 550 and 600 mm are bored, a through hole is drilled in stocks, and they are welded with a solid seam to one of sides of cylindrical jackets to form sleeves. Cylindrical bushings are inserted into formed sleeves and are connected by welding assembly seams with jackets and end rings. Produced bimetal stocks are heated to temperature 1250-1260°C, stitched into the cross-rolling mill into bimetal cartridges with size 540×vn.315×1910 and 600×vn.365×2700 mm, which are rolled on a pilgrim mill into hot-rolled tube stocks with size 371×50.5×4500 and 446×54×5100 mm. Hot-rolled tube stocks are bored and turned into finished bimetal pipes. |
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Method of producing of tube stock sized to 290x12 mm to specs 8-16 Invention relates to production of 290x12 mm tube stock. Proposed method comprises casting the ingots by electric slag remelting. Produced ingots are cut over outer surface to remove casting flaws to billets. Through 100±5.0 mm-dia central bore is made and billets are heated to yield point. First, said ingots are pierced at helical rolling stand to make sleeves. Said sleeves are rolled at Pilger mill with 480xin.295×250-300 mm carbon jar washers to tube stocks to be drawn and reduced in diameter. Hot cutting saw is used to remove process wastes in the form of Pilger heads and seed ends. Socks are cut into two equal-length tubes to be straightened at six-roll straightener and machined to commercial hexagonal tube billets sized to 257+2.0/-3.0×6.0+2.0/-1.0×4300+80/-30 mm. |
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Invention relates to pipe rolling. Continuously-cast 430 mm-dia billets are heated to plasticity temperature. Said billets are pierced at piercing mill on 250 mm-dia mandrel with drawing µ=1.56. Produced sleeves are rolled at Pilger mill to pipe sections at fixed sleeves feed to strain zone at steady-state rolling conditions mst. Pipe sections are cut to equal lengths, heated, gaged and straightened. Preliminary acceptance is carried our, thread is cut, couplings are screwed on, hydraulic tests are carried out and pipes are accepted. Continuously-cast biller length is defined by relationships L b = L p μ Σ , μ Σ = μ p μ r o l = R 2 b K ( D P − S r a t ) S r a t , where Lp=36000 is design length of rolled pipe, mm; µΣ=µpµrol is total factor of drawing the billet to commercial; Rb is billet radius, mm; K=0.965 is factor allowing for waste of metal at heating in continuous furnace; Dp=244.5 is rated pipe OD, mm; Srat is design wall depth at pipe rolling at Pilger mills equal to 8.25, 9.25 and 10.35 mm. |
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Tube cold-rolling mill stand pressure device Proposed device comprises bed with thrust rail, wedge arranged between said bed and thrust rail and mechanism of wedge lengthwise displacement drive composed of screw and nut. Stand stiffness is increased and transfer time is decreased by making skew ledge at wedge end with bore for screw of ledge drive, said screw being equipped with two washers with antifriction shims arranged on both sides of said skew ledge of the wedge and locking washers, bush, ledge and nut. Said screw has spline end to fit spline sleeve or reducer thereon while screw drive nut is cylindrical. Bed has two blind mutually perpendicular bores to receive cylindrical nut and wedge drive screw. Plate with inclined surface for ledge and seat for thrust rail is arranged between wedge and thrust rail. Bed has lubing bores, wedge being provided with lubing grooves communicated by bores while two grease cups are arranged at the bed. |
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Method and device for pipe production by cold pilger rolling Invention relates to pipe rolling. Pipe are made by cold Pilger rolling at rolling mill including rolling mandrel arranged at, at least one mandrel counter support. At least two deforming tools act on the pipe from outside. Measuring device defines pipe OD in deforming. To allow adjustment of position of at least one deforming tool on the basis of measurements made in deformation, at least one position control device is connected with at least one deforming tool acting on pipe from outside. Note here that said position control device is connected with measurement device. |
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Method and device for pipes manufacturing by cold pilger rolling method Rolling mill is used including a mandrel for rolling supported by at least one mandrel holder, also it includes at least two pressure shaping tools impacting the pipe from the outside, preferably they should be two external rolls. Also a measurement device is used for determination of pipe wall thickness during pressure shaping method. Device for support displacement is connected by operating connection to mandrel holder support and this device for support displacement is connected to measurement device. |
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Invention can be used for production of hexahedral pies for sealed storage in nuclear power station ponds and transportation of used nuclear fuel. Cast produced by electroslag remelting, turned to remove foundry defects, heated to ductility storage and pierced at cross-rolling mill to sleeves. Mandrel with ring is fitted at pilgrim mill mandrel head. Cylindrical carbon jar washer is fitted on mandrel to be fitted in said sleeve. Then, tapered cylindrical carbon jar washer is fitted on the mandrel and centered relative to mandrel axis by taper section of carbon jar washer. Assembled sleeve is shaped at variable-profile gages to steel pipe with seed end and pilgrim head fitted on carbon jar washers. |
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Invention relates to metallurgy. Ingots or blanks are heated to ductility temperature, pieced at cross-rolling mill to sleeves with ID larger that mandrel diameter or to tube blanks. First and second bottle conversions are fitted on mandrels and deformed to commercial pipes at preset magnitude of feed. Sleeves are subjected to rejection. After 2-3-fold heating, sleeves not fitted on mandrel or those with flaws are rolled at smaller-diameter to tubes with thicker walls. Sleeves with increased curvature are rolled, reduced to blanks at smaller-diameter mandrel at draw factor of 0.95≤µ≤0.98.Sleeves are pierced with elevation in diameter equal to amount of rolling for increased curvature tubes, fitted on mandrel and rolled to preset-diameter commercial tubes at design pass. |
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Sealing device of piston-rod of cold pipe rolling mill Sealing cup is made in the cross section in the form of a supporting element connected to the housing and two elastic jaws with working edges located on both sides of the supporting element. Working surface of the supporting element, which is cylindrical, and working edges of jaws contact the piston-rod surface. |
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Invention relates to pipe rolling and may be used in production of high-strength oil pipes by preparing well casing and oil-well tubing for thread cutting with temperature of 500-720°C after heat treatment. Proposed method comprises gaging the pipes in multi-roll sizing mill passes. It comprises also sizing the pipes to preset OD with ovality not exceeding 0.6 mm in round-pass rolls without tapers ,pass size being defined by: Dp=Dt·(1+α-t), where Dp is pass diameter, mm; Dt is preset pipe OD, mm; α is pipe material linear expansion factor, -10-6 degree-1; t is pipe temperature, °C. Note here that pass sizes are equal for every mill to ensure ovality not exceeding 0.6 mm in one pass. |
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Invention relates to pipe rolling, particularly, to pipe cold rolling mill stand. Mill stand comprises stationary bed, moving housing with vertical working rolls arranged therein and rolls rack drive with gears and racks. Bottom racks is secured at stationary bed while top rack is attached to tip-up crossbar. Note here that mill stand is equipped with frame bolted to stationary bed lateral sides. Said frame end faces are attached to said bed by wedge joints. Tip-up crossbar is fitted in the frame of axle fitted in two bearings and locked by wedge. Said wedge is drive by hydraulic cylinder while crossbar has extra hydraulic cylinder with its casing articulated therewith. Rod cylinder is articulated with the frame. Note also that mill stand is equipped with protective means to cover bed working space composed of cover articulated with stationary bed to cover it and cases arranged at bed sides and end faces. Note here that said cover is provided with lifting hydraulic cylinders mounted at bed sides. Sumps are arranged at side casings while oil throwers are arranged at said cover. |
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Proposed mill stand comprises stationary bed, support rails, mobile housing with vertical rolls and pads engaged with its drive, roll rack drives and fixed racks and gears fitted on axles, and pressure roll adjustment mechanisms with screw pairs. Easier access to stand components and its accurate positioning are ensured by furnishing it with the frame locked at said stationary bed by wedge joint. Frame bottom part has grooves for locking it against lengthwise displacement at support bars. Frame mid part has recess for roll and ledge for rack. Frame rear end has extending part for bearing rails. Two detachable guides are arranged on stand opposite sides, between support rails and mobile housing. Top part of every guide has surface with two ledges at its edges for reliable joint with mobile housing while bottom part has two horizontal and one vertical surfaces lined by straps to get in contact with support rails and straps of bars fitted in bed. Horizontal and vertical surfaces of every guide direct mobile housing with rolls in rolling axis. |
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Method of feeding billets to tube cold rolling mill stand with lateral feed Proposed method comprises feeding the billets onto intake table and displacing them for leveling their ends, shifting reference rod and billet jaw along rolling axis through billet length, transfer of billet from intake table to rolling axis, moving reference rod back into working position, feeding it into billet and locking it, and feeding the billet into strain source by billet jaw. Better lubrication and heat withdrawal are ensured by feeding lubricant to rolling axis via rod fitted into the billet and locked by lever arranged at rod mount and having one end provided lubing head and opposite end engaged with lubing head drive hydraulic cylinder. Note here that lubrication is fed continuously during rolling. |
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Rack-and-pinion drive of tube pilger mill roll Proposed drive comprises round constant pitch angle pinion engaged with mill roll and fixed rack engaged therewith. Required ratio between mill stand reciprocation liner speed and roll angular speed is ensured by making rack teeth side surfaces in the zone of mutual contact with pinion teeth side surfaces as conjugated surfaces formed in rolling of round pinion variable-radius centroid line over that of the rack. Note here that at sections corresponding to such angular positions of pinion and roll rigidly engaged therewith whereat tube is reduced in variable-radius roll. Note also that pinion centroid radial coordinate equals roll variable rolling radius to rule out dam of strain in tube billet. |
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Proposed mill comprises stationary bed with guides, working stand driven by drive cod-rods to reciprocate in guides, top and bottom rack engagement, intermediate and front cartridges, pipelines connected to tank with lubricant-coolant and devices to feed the latter into strain source connected with pipelines located at stand inlet and outlet. Invention differs from known designs in that lubricant-coolant feed device located at stand inlet, behind the intermediate cartridge, is composed of sprayer mounted at the frame secured at the bed. Note that lubricant-coolant feed device at stand outlet is composed of circular support secured at front cartridge and provided with crossbars. Aforesaid sprayer is hinged therefrom and made up of two hollow cases opening at replacing front cartridge cams. Casing for wiring is arranged between said crossbars screwed to circular support to prevent sprayer opening in rolling. Sprayers are furnished with channels to feed lubricant-coolant to top rack engagement from stand inlet and outlet sides. |
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Tube cold-rolling mill stand drive Invention relates to metallurgy. Proposed drive comprises drive shaft and two gear wheels, two con-rods, two cranks hinged to con-rods and fitted on coaxial crankshafts with wheelwork each including crankshaft with gear wheel fitted thereon and, if required, countershafts locked axially and provided with engaged gear wheels meshed with crankshaft gear wheel, and counterweights fitted on crankshaft and/or countershaft. Closure of side clearances in gearing during stand reciprocation is ensured by providing the drive with extra shaft to engage similar gear wheels of two wheelworks by extra gear wheels fitted on said shaft. Note here that said extra shafts floats axially and is furnished with axial pressure mechanism engaged with housing. All gear wheels represent helical gears with opposite direction of teeth. Drive shaft is arranged parallel about axis of crankshafts while drive gears are fitted directly at drive shaft to engage with similar gear wheels of wheelwork. |
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Rolling mill roll 1 has two necks 2 of which, at least, one is equipped with sleeve locked against turning. Note here that roll neck sleeve is surrounded by bearing bush 9 fixed in pad 10. Note also that polygonal joint between roll neck 2 and neck sleeve 4 allows their relative locking against turning. Besides, thrust ring 11 with collar is arranged between neck sleeve 4 and bearing bush 9. Collar polygonal inner edge enters with geometrical closure the polygonal outer edge of step 5,15 of roll neck 2. |
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Proposed method comprises electroslag remelting of 470±5 "хвн." 270±5×3050±50 mm ingots from 04X14T5P2"Ф-Ш"-grade low-ductile steels with boron content of 2.0 to 3.0% with bottom and shrinkage parts and specified height to make Pilger heads in tube stock rolling and seed ends from ductile carbon steels, turning and boring to make hollow ingots to be rolled to tube stock. It comprises also removing machining wastes, that is, Pilger heads and seed ends to make tube sections of ductile carbon steels. Then, tube sections are cut to tube stock to be bored and turned to tube billets. Holes are bored for pull chain for hot shaping at ductile carbon steel parts. Note here that billet sizes and machining conditions are specified fat all machining steps. |
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Proposed method comprises electroslag remelting of ingots from 04X14T5P2"Ф-Ш"-grade low-ductile steel with boron content of 2.0-3.0% and bottom and shrinkage parts from ductile carbon steels, turning said ingots to produce billets wherein through central bore is drilled, and heating them to 1040-1060°C. First, said ingots are pierced at helical rolling stand. Then, they are rolled at Pilger stand to tube sections to cut off process wastes so that ductile carbon tube 500-600-mm-long ends are made on dummy ingot and Pilger head side. Then, they are straightened and cut into multiple length tube stock and ends. Now, they are bored and turned to cylindrical tubes to be shaped to hexagonal tube billets. Note here that billet sizes and machining conditions are specified for all machining steps. |
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Proposed method comprises making hollow ingots by electroslag remelting from low-ductile steel "04Х14Т5P2Ф-Ш" with boron content of 2.0 to 3.0%, boring and turning said ingots to hollow ingots and be heated and rolled to tube stock and cutting off process wastes, i.e. Pilger heads and seed ends. Thereafter, tube stock is hot-sawn into multiple tubes and ends, and straightened. Multiple tubes are cut into two billets to be bored and turned into tube billets to be shaped to preset size hexagonal tubes. Note here that billet sizes and machining conditions are specified for all machining stages. |
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Method of making 257+2,0/-3,0×6,0+2,0/-1,0×4300+80/-30 mm-hexagonal tube billets Proposed method comprises making ingot by electroslag remelting, turning their outer surface to remove casting defects, drilling central 100±5,0 mm-dia bore, heating the ingots, piercing at helical rolling mills, rolling at Pilger mill into tube stock, cutting the latter into tube sections, their straightening and hot hexagonal tube 257+2.0/-3.0X6.0+2.0/-1.0X4300+80/-30 mm-billets. Required quality is ensured by that electroslag remelting of 470±5 "хвн." 270+5×3050±50 mm ingots from 04X14T5P2"Ф-Ш"-grade low-ductile steels is performed to make Pilger heads in tube stock rolling and seed ends from ductile carbon steels, turning and boring to make hollow ingots to be rolled to tube stock. It comprises also removing machining wastes, that is, Pilger heads and seed ends to make tube sections of ductile carbon steels. Then, tube sections are cut to tube stock to be bored and turned to tube billets. Holes are bored for pull chain for hot shaping at ductile carbon steel parts. Note here that billet sizes and machining conditions are specified at all machining steps. |
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Device includes movable wedge moved with a screw fixed with its projection against longitudinal displacement in slot of bottom wedge, and wedges fixing the rack. Rack is installed in the housing restricting it against longitudinal displacement. Possibility of separate displacement of wedges and provision of minimum side gaps in rack-pinion engagement, reduction of metal consumption and labour intensity of production of roll stand equipment due to reducing the overall dimensions of wedge connection as to height and simplifying the production of wedges and bottom wedge, which do not require high accuracy of angles of their slopes is provided due to the fact that additional movable wedge is located opposite the movable wedge. Rotating nut is installed on screw in movable wedge. Bottom wedge is provided with two symmetrical surfaces for inclined surfaces of movable wedges. Screw has left and right threads interacting with corresponding threaded holed of wedge and nut. Racks are engaged with pinions of rolls. Bottom wedge is fixed in pinion rack with projections against longitudinal displacement. |
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Roll mill for rolling tubes with outer lengthwise ribs Proposed roll mill comprises stand with working rolls, main drive, tube turning mechanism with two transmission shafts coupled with main drive via converter of uniform rotation into irregular rotation. One of said shafts is articulated with mandrel rod chuck while another one is coupled via gearing with biller chuck and tube turning front chuck. Stepless adjustment of precise alignment of grooves in chuck cams with those in pass is ensured by coupling transmission shaft with gearing drive gear by means of clamping and bearing conical couplings furnished with clamping and unclamping bolts while front chuck cam cross-section profile is provided with grooves mating with profile of finished ribbed tube. |
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Method of reconditioning pipe cold rolling mill stand roller pass Proposed method comprises refacing roller pass groove. After refacing, roller are mounted into stand. Note here that pass size is increased by amount of wear. Note here that rollers with variable-section pass groove are turned by amount compensating pass wear size on varying positions of rollers. Rollers are turned by displacing tooth-rack drive racks toward rolling start. Displacement of said racks is effected in lengthwise direction in compliance with stand design to allow aligning top and bottom roller pass grooves and make pass groove sections aligned with turn angle of crank that defines stand position. |
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Rolling mill of cold pilger mill Invention refers to the rolling mill of cold pilger mill. Rolling mill includes reciprocal moving buckle plate with operating and support rolls and power stand comprising basis and cap with supporting rail, vertical stands connecting basis and cap, mechanism of cap position adjustment and mechanism of rolling only with direct move of the buckle plate. Possibility to eliminate hinge joints from the mill drive and thus to increase its reliability is ensured by the fact that the basis of the stand includes additional body with supporting rails at two eccentric shafts with bearings in the basis of the stand and general impulse rotation drive. At this support rails are installed in contact with lower support rolls of the buckle plate. |
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Method of rolling sleeves at disk mill Invention relates to metal forming and may be used at tube hot rolling mill stands. Proposed method comprises piercing the sleeve on mandrel in rolls with conical inlet and outlet and riser pad there between. Note here that mandrel front plane is arranged in roll riser pad. Distance between rolls at the point rolls break off rolls in outlet cone is kept constant while mandrel work section length equals that of outlet cone section. Arrangement of mandrel front plane in roll riser pad, billet free deformation (primary gripping) is executed solely in disk mill roll inlet cone while deformation of wall and roll diameter rising is performed in outlet cone. |
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Method of cold deformed bar rolling of pipes In method of cold deformed bar rolling of pipes a rolled cartridge prior to each forward motion of deformed bar rolling is fed by one step, fixed relative to a mill stand and then deformed plastically by rollers of a double-roller rolling mill that makes reciprocal movement, besides, rollers have a pass of alternating radius. Reduced values of tension or backing that occur in process of plastic deformation of the cartridge are provided as a result of the fact that forward displacement of a mill accompanied with rotation of rollers is carried out so that displacement of the mill and the angle of rotation of each rolling mill are in a ratio regulated by a mathematical dependence. |
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Invention relates to the field of pipe-rolling production, more specifically, to cold-rolling mills for pipes of large dimension type. Pipe cold-rolling mill comprises frame with guides, working stand installed on them, movable power bed plate with support rails and geared racks, movable cassette, working rolls installed in it with master pinions, and also drive for reciprocal motion of stand. Movable cassette comprises replaceable gages with variable-section strands and feed-and-turn gaps. Variable-section strands are referenced to base plane of gages by variable reference angle that allows deploying gages with variable-section strands and feed-and-turn gaps within the limits of cassette work travel. To synchronise motion of movable power bed plate and cassette there is a double-arm lever connected by means of connecting rod and additional connecting rod with movable power bed plate and connecting rods of permanent length with movable cassette. Foundation con rods feature constant length. |
Another patent 2528671.