EP1170068B1 - Reduzierwalzwerk mit drei Walzen zum Reduzieren eines durch Elektro-Widerstandschweissung erzeugten Rohres - Google Patents

Reduzierwalzwerk mit drei Walzen zum Reduzieren eines durch Elektro-Widerstandschweissung erzeugten Rohres Download PDF

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Publication number
EP1170068B1
EP1170068B1 EP20000114339 EP00114339A EP1170068B1 EP 1170068 B1 EP1170068 B1 EP 1170068B1 EP 20000114339 EP20000114339 EP 20000114339 EP 00114339 A EP00114339 A EP 00114339A EP 1170068 B1 EP1170068 B1 EP 1170068B1
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EP
European Patent Office
Prior art keywords
follower
sliding
roll
forming rolls
adjusting screw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20000114339
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English (en)
French (fr)
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EP1170068A1 (de
Inventor
Yukio Kusakabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kusakabe Electric and Machinery Co Ltd
Original Assignee
Kusakabe Electric and Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kusakabe Electric and Machinery Co Ltd filed Critical Kusakabe Electric and Machinery Co Ltd
Priority to EP20000114339 priority Critical patent/EP1170068B1/de
Priority to DE2000623282 priority patent/DE60023282T2/de
Publication of EP1170068A1 publication Critical patent/EP1170068A1/de
Application granted granted Critical
Publication of EP1170068B1 publication Critical patent/EP1170068B1/de
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
    • B21B13/10—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane
    • B21B13/103—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane for rolling bars, rods or wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • B21B31/30—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal by wedges or their equivalent

Definitions

  • the present invention relates to a reducing mill according to the preamble portion of claim 1, to be disposed at the rear of a plant for manufacture of electro-resistance-welded steel tubes wherein a narrow and long successive steel plate (a strip) is gradually formed into a cylindrical shape, seam-welded, and then, reduced with its diameter by the reducing mill.
  • a previous reducing mill having three rolls comprised a stand supporting three rolls exclusive to each product size. If the rolls have worn away, the stand supporting the rolls is replaced with another stand supporting three new rolls. The worn rolls are ground and the stand having the rolls is used for diametrically larger products.
  • the three-roll-type reducing mill has been improved so that its stand is provided with mechanisms for adjusting the position of the roll to mill a formed electro-resistance-welded tube into various sizes, as disclosed in an earlier application on which the preamble is based (Japanese Patent Application Laid-Open No. 9-262620) filed by the present applicant.
  • each of two positionally-adjustable forming rolls is moved along a tangent to a curve of a positionally-fixed forming roll adjacent thereto for abutting against an objective tube at each of opposite ends of the positionally-fixed forming roll, in other words, along a direction at a 30° angle from a radial line of the positionally-fixed forming roll across the center of the objective tube.
  • This reducing mill comprises three rotary shafts; one is a drive shaft for one positionally-fixed main forming roll, and the other two are follower shafts for respective positionally-adjustable follower forming rolls which are driven by the drive shaft through respective bevel gears.
  • Each rotary shaft is disposed in parallel to a shaft serving as an axis of a roll (a roll-axis shaft) on which each roll is fixed and drivingly connected with the roll-axis shaft through gears, so that the roll-axis shaft can be axially moved within the backlash between the gears.
  • the roll-axis shaft can be moved in perpendicular to its axis (radially) by sliding means.
  • a movement of each of the follower forming rolls along a tangent to the curve of the main forming roll for abutting against an objective tube at each of the opposite ends of the main forming roll results from the two axial and radial movements of the roll-axis shaft.
  • each of the follower forming rolls since the axial movement of the roll-axis shaft and the radial movement thereof are independent of each other, each of the follower forming rolls, actually, cannot move straightly along the above-mentioned tangent. It is difficult to adjust the position of each of the follower forming rolls along the tangent exactly and for a short time by two operations for different movements of the roll-axis shaft of the follower forming roll. Furthermore, a proper positional adjustment of the follower forming rolls for the moment cannot be made during the processing of the reducing mill under inspection of finished products, even if any problem is found on the product finished by the reducing mill.
  • a three-roll-type reducing mill as defined in claim 1 including three forming rolls disposed at regular intervals so as to arrange their axes in an equilateral triangle shape and brought into contact with an outer periphery of an electro-resistance-welded steel tube so as to mill the tube into round while reducing the diameter thereof, wherein one of the three forming rolls is a main forming roll fixed in position, the other two forming rolls are follower forming rolls drivingly following the main forming roll, and both of the follower forming rolls can be moved simultaneously with each other and symmetrically with respect to a center of the main forming roll along respective tangents to a curve of the main forming roll for abutting against the electro-resistance-welded steel tube at two opposite ends of the main forming roll.
  • positions of the follower forming rolls can be changed while transmitting rotation driving force from the main forming roll to the follower forming rolls and the diametrical reduction of the steel tube can be adjusted without generating an irregularity or a flaw in an outside shape of the milled steel tube.
  • the pair of left and right follower forming rolls are respectively supported by sliding brackets, both the sliding brackets are respectively in slidable contact with a pair of left and right tapered blocks screwed onto an adjusting screw shaft, and the tapered blocks are simultaneously moved oppositely to each other along said adjusting screw shaft whether toward each other or away from each other by rotation of the adjusting screw shaft.
  • each of the sliding brackets is formed with a sliding face in parallel to each of the tangents, and a stand structure supporting the three forming rolls is formed with a pair of left and right sloped faces in parallel to the respective tangents, so that the sloped faces are brought into slidable contact with the sliding faces of the respective sliding brackets. Therefore, the sliding brackets are moved along the respective tangents while their sliding faces slide on the respective sloped faces during the movement of the tapered blocks by rotational operation of the adjusting screw shaft.
  • the adjustment of roll positions can be also made corresponding to a difference of a springback caused by variation of the steel in material, thereby maintaining an extremely satisfactory accuracy of the finished diameter of the product.
  • a three-roll-type reducing mill 1 of the present invention having one main forming roll 19 and two follower forming rolls 23 is provided for reducing a diameter of an electro-resistance-welded steel tube P by use of rotation of the three forming rolls 19 and 23.
  • a stand structure of a three-roll-type reducing mill 1 of the present invention comprising a main frame 2, a rear cover 4 and a front cover 5 in accordance with FIGS. 1 to 5.
  • the main frame 2 which is formed of cast steel material, is provided with a main chamber 2a and a pair of left and right coaxial drive shaft holes 2b by machine work.
  • the main chamber 2a is open at both the front and rear surfaces of the main frame 2.
  • the drive shaft holes 2b are extended laterally from an upper portion of the main chamber 2a to be open at respective left and right surfaces of the main frame 2.
  • the main chamber 2a is partly extended downward so as to form a lower chamber 2c, which is open at one of left and right sides of the main frame 2.
  • Left and right outer sides of the main frame 2 are symmetrically notched slantwise so as to make left and right stays 49, at which respective female screws 49a are open and bored through the main frame 2 to the main chamber 2a.
  • the rear cover 4 is provided at the center portion thereof with a central hole 4a, through which an electro-resistance-welded steel tube P is passed and drawn, and three holes 4b for inspection and repair of the forming rolls 19 and 23 around the central hole 4a.
  • a pair of triangular stays 45 To opposite sides of the rear cover 4 are further formed a pair of triangular stays 45 in a three-dimensional manner by skiving.
  • a sloped face 44 of each of the triangular stays 45 is to be a slide guide for a sliding bracket (chock) 22 serving as a part of a positioner of the follower forming roll 23, as discussed below. There is made a 30° angle between the sloped face 44 and a vertical line.
  • the front cover 5 has a shape corresponding to the rear cover 4 as shown in FIG. 5 but is not provided with the triangular stays 45.
  • rear and front surfaces of the main frame 2 are screwed the rear cover 4 and the front cover 5.
  • Left and right surfaces of the main frame 2 are respectively covered with side covers (not shown) which have respective openings in direct connection with outer ends of the drive shaft holes 2b.
  • both the drive shaft holes 2b of the main frame 2 are fixedly disposed cylindrical shaft casings 12 and 13.
  • a drive shaft 11 is laterally extended through both the shaft casings 12 and 13 and through the upper portion of the main chamber 2a between the shaft casings 12 and 13.
  • each of taper roller bearings 14 and 15 is interposed between each of the shaft casings 12 and 13 and the drive shaft 11 .
  • main bevel gears 20 which are fixed on the drive shaft 11.
  • the main forming roll 19 is fixedly fitted between the main bevel gears 20.
  • the drive shaft 11 is rotated by power of a motor (not shown).
  • a pair of follower shafts 26, respectively In the lower left and right symmetrical portions of the main chamber 2a are disposed a pair of follower shafts 26, respectively, so that the drive shaft 11 and the two follower shafts 26 are arranged in an equilaterally triangular shape.
  • a follower bevel gear 21 On each of the follower shafts 26 is rotatably disposed a follower bevel gear 21.
  • Onto the follower bevel gear 21 is fixedly fitted the follower forming roll 23. Therefore, the follower forming roll 23 is rotatable together with the follower bevel gear 21 around the follower shaft 26.
  • a cylindrical barrel portion is integrally extended from each of the follower bevels gears 21.
  • a collar 25 (as shown in FIG. 7) is screwed to an end of the barrel portion of the follower bevel gear 21 by using bolts 72 as shown in FIG. 6.
  • the collar 25 and the follower bevel gear 21 are rotatably disposed around each of the follower shafts 26 through a taper roller bearing 35.
  • a key groove 60a is formed at an outer surface of the barrel portion of the follower shaft 26 as shown in FIG. 9, and a key groove 60b is formed at an inner peripheral surface of the follower forming roll 23 as shown in FIG. 10.
  • the follower forming roll 23 is substantially fixedly disposed around the barrel portion of the follower bevel gear 21 through a key disposed in the key grooves 60a and 60b coinciding with each other, so that the follower forming roll 23 is sandwiched between the follower bevel gear 21 and the collar 25.
  • an 0-ring 36 is interposed between the follower bevel gear 21 and the follower forming roll 23, and an 0-ring 37 is between the follower forming roll 23 and the collar 25.
  • the pair of main bevel gears 20 mesh with the respective follower bevel gears 21 so as to transmit the rotation of the drive shaft 11 to the left and right follower forming rolls 23. Therefore, when the drive shaft 11 is rotated by the motor, the main forming roll 19 rotates together with the drive shaft 11, and simultaneously, the left and right follower forming rolls 23 rotate around the respective follower shafts 26 by the meshing of bevel gears 20 and 21.
  • the three forming rolls 19 and 23 are disposed at regular intervals, so that a curve 65 of the main forming roll 19 and curves 66 of the two follower forming rolls 23, when viewed in front, for abutting against an electro-resistance-welded steel tube P are arranged so as to form a longitudinally cylindrical pathway corresponding to a predetermined caliber through which the steel tube P is drawn so as to be reduced with respect to its diameter.
  • a curve 65 of the main forming roll 19 and curves 66 of the two follower forming rolls 23 when viewed in front, for abutting against an electro-resistance-welded steel tube P are arranged so as to form a longitudinally cylindrical pathway corresponding to a predetermined caliber through which the steel tube P is drawn so as to be reduced with respect to its diameter.
  • a tangent T to an outer periphery of the pathway (the curve 65) when viewed in front at each of opposite end points of the main forming roll 19 adjacent to the end of each of the follower forming rolls 23 is directed at a 30 ° angle from a vertical line, thereby being parallel to the sloped face 44 of the triangular stay 45.
  • An electro-resistance-welded steel tube P is supplied into the pathway formed by the three forming rolls 19 and 23, so that, during its longitudinal movement through the pathway, the diameter of the steel tube P is gradually reduced by the three rotating forming rolls 19 and 23.
  • the caliber of the pathway can be adjusted by the positioning of the follower forming rolls 23 with respect to the positionally-fixed main forming roll 19, so as to adjust the reduced diameter of the steel tube P.
  • the follower forming rolls 23 are slid along the respective sloped faces 44, i.e., the respective tangents T, whereby the main forming roll 19 and each of the follower forming rolls 23 are prevented from positional difference therebetween in a radial direction of the pathway, thereby preventing the milled steel tube P from irregularities or flaws thereon.
  • the follower shaft 26 is supported by the C-shaped sliding bracket 22 as shown in FIGS. 11 to 14 comprising a base member 22a and two stays 40 and 41. As shown in FIGS. 13 and 14, two opposite end portions of the base member 22a are cut away so as to be narrowed. The cutaway surface of each end portion of the base member 22a is provided therein with a sectionally semicircular groove in which each end of the follower shaft 26 is held. Each of the stays 40 and 41 is also provided therein with a sectional semicircular groove for coinciding with that of each end portion of the base member 22a.
  • each of opposite ends of the follower shaft 26 is inserted into the sectional semicircular groove on each of the end portions of the base member 22a, and each of the stays 40 and 41 is fitted into the vacant space adjacent to each end portion of the base member 22a so as to fit its sectional semicircular groove onto each end of the follower shaft 26 held in each of the sectional semicircular grooves of the base member 22a.
  • each end of the follower shaft 26 is sandwiched between each of the end portions of the base member 22a and each of the stays 40 and 41.
  • the stays 40 and 41 are screwed to the base member 22a so as to complete the sliding bracket 22 with the follower shaft 26 fixed thereto.
  • the two ends of the follower shaft 26 are partly cut away for prevention of interference with the shaft casing 12 (13) and the later-discussed tapered block 24R (24L). Therefore, the follower shaft 26 are to be correctly disposed in its radial direction and fixed to the sliding bracket 22.
  • the base member 22a of the sliding bracket 22 is provided at an approximately vertical and longitudinal middle portion thereof with a through hole 43 through which a bolt 28 is freely passed as discussed below.
  • the diameter of the through hole 43 is sufficiently larger than that of the bolt 28 so as to allow the sliding bracket 22 to move crosswise to the bolt 28 during its sliding along the sloped face 44 of the triangular stay 45.
  • the base member 22a is provided at its suitable surface with an oil groove 42 and a drilled hole 63 in communication with the oil groove 42, such that lubricating oil can flow therethrough.
  • the base member 22a of the sliding bracket 22 is formed with two notches functioning as sliding surfaces during its motion almost along the bolt 28.
  • One is a sliding surface 38 for slidably abutting against the sloped surface 44 of the triangular stay 45 secured onto the rear cover 4, and the other is a sliding surface 39 for slidably abutting against the tapered block 24R (24L) disposed under the sliding bracket 22.
  • the through hole 43 is substantially a bisector of an angle made by the two sliding surfaces 38 and 39, i.e., an angle made by the sloped surface 44 of the triangular stay 45 and the sloped top surface of the tapered block 24R (24L). Also, the through hole 43 is perpendicular to the axis of the follower shaft 26.
  • a top of one end of the sliding bracket 22 (the stay 40 and one end of the base member 22a) is partly cut away for prevention of interference with the shaft casing 12 (13).
  • the other end of the sliding bracket 22 (the stay 41 and the other end of the base member 22a) is cut away so that, if the sliding bracket 22 is correctly located, the cutaway end surface is directed vertically, thereby preventing the corresponding ends of both the sliding brackets 22 from interference with each other.
  • each of the tapered blocks 24L and 24R is provided at its top and bottom faces with oil grooves 52 and 53, respectively.
  • the oil groove 52 is used for supplying lubricating oil between each of the sliding brackets 22 and each of the tapered blocks 24L and 24R.
  • the oil groove 53 is for supplying that between each of the tapered blocks 24L and 24R and the main frame 2.
  • each of the tapered blocks 24L and 24R is vertically drilled by an oil hole 54 through its female-screwed hole for supplying lubricating oil between an adjusting screw shaft 27 disposed in the female-screwed hole and each of the tapered blocks 24L and 24R.
  • the tapered blocks 24L and 24R are mounted on the bottom surface of the lower chamber 2c of the main frame 2 so that their female-screwed holes are directed laterally and co-axially and their upper portions protrude into a lower space of the main chamber 2a.
  • the top of outside end of each of the tapered blocks 24L and 24R is higher than the top of the inside end thereof, so that the top sloped surfaces of both the tapered blocks 24L and 24R are arranged in a laterally-widened V-like shape when viewed in front.
  • An inner stopper 69 is disposed between the tapered blocks 24L and 24R so as to limit inward movements of the tapered blocks 24L and 24R against each other.
  • the adjusting screw shaft 27 is laterally inserted from the left or right (in this embodiment, left) opening of the lower chamber 2c into the lower chamber 2c so as to penetrate both the tapered blocks 24L and 24R through their female-screwed holes.
  • a pair of outer stoppers 47 are fixed onto the adjusting screw shaft 27 so as to limit outward movements of the tapered blocks 24L and 24R away from each other.
  • the adjusting screw shaft 27 is provided thereon with a pair of left-hand and right-hand screws arranged symmetrically with respect to its intermediate portion disposed between the tapered blocks 24L and 24R.
  • the two screws of the adjusting screw shaft 27 coincide with the respective female screws 51 of the left and right tapered blocks 24L and 24R. Therefore, if the adjusting screw shaft 27 is rotated in either of its opposite rotational directions, the tapered blocks 24L and 24R are moved simultaneously with each other along the adjusting screw shaft 27 in opposite directions.
  • the through hole 43 is approximately directed toward the axis of the pathway for the steel tube P and co-axially with the female screw 49a of the main frame 2.
  • the bolt 28 is directed radially of the follower shaft 26 (perpendicularly to the axis of the follower shaft 26), freely disposed through a spring 46 and the through hole 43 and screwed into the female screw 49a of the main frame 2 so as to project outwardly from the stay 49.
  • the projecting end portion of the bolt 28 is thread-cut and provided thereon with a nut 28a, thereby being fastened onto the stay 49.
  • the thickness of the sliding bracket 22 coincides with the distance between the front and rear covers 5 and 4, i.e., the thickness of the main frame 2, so that the sliding bracket 22 is prevented from a longitudinal slippage.
  • each of the sliding brackets 22 becomes movable downwardly to the degree corresponding to the lateral motion of each of the tapered blocks 24L and 24R, and each of the sliding brackets 22 naturally moves toward the stay 49 by the biasing force of the spring 46 along the sloped face 44 of the triangular stay 45 while the sliding surfaces 38 and 39 slide on the triangular stay 45 and the tapered block 24L or 24R, thereby moving the follower forming rolls 23 away from the main forming roll 19 along the tangents T.
  • the two sliding brackets 22 respectively incorporated into the left and right follower systems are slidden symmetrically with respect to the center of the main forming roll 19 and in the same movements by the rotation of the adjusting screw shaft 27.
  • the range of the motion of the sliding bracket 22 toward the stay 49 is limited within a range of backlash of the meshing bevel gears 20 and 21 for prevention of cut of power transmission between the main and follower forming rolls 19 and 23.
  • the tapered blocks 24L and 24R are previously set away from each other to some degree.
  • a gauge stick having a diameter coinciding with the caliber is located just beneath the main forming roll 19, and then, the adjusting screw shaft 27 is rotated so as to move tapered blocks 24L and 24R toward each other, thereby moving the left and right follower forming rolls 23 together with their sliding brackets 22 toward the axis of the gauge stick till the left and right follower rolls 23 abut against the gauge stick.
  • both the positions of the follower forming rolls 23 can be simultaneously adjusted only by rotation of the adjusting screw shaft 27 which is operated whether manually or automatically, whereby a diametrical reduction of the processed steel tube P can be adjusted easily and swiftly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (1)

  1. Dreiwalzen-Reduzierwalzwerk (1) zur Herstellung von elektrowiderstandsgeschweißten Stahlrohren (P), mit:
    drei Formwalzen (19,23) mit einer positionsmäßig feststehenden Hauptformwalze (19) und zwei positionsmäßig anpassbaren Folgeformwalzen (23), welche antriebsmäßig der Hauptformwalze (19) folgen, wobei die drei Formwalzen (19,23) von einer Gerüststruktur (2) getragen werden und in regelmäßigen Abständen so angeordnet sind, dass ihre Achsen (11,26) in der Form eines gleichseitigen Dreiecks angeordnet sind, wobei die drei Formwalzen (19,23) jeweils gekrümmte Oberflächen (65,66) aufweisen, welche mit einem Außenumfang eines Stahlrohrs (P) in Kontakt gebracht werden können, das in Bezug auf dessen Durchmesser beim Ziehen durch das Walzwerk reduziert wird, wobei die gekrümmten Oberflächen (65,66) der drei Formwalzen (19,23) einen zylindrischen Durchgangsweg festlegen, der einem vorbestimmten Rohrdurchmesser bzw. Kaliber des Stahlrohrs (P), in der Richtung betrachtet, in der das Stahlrohr (P) gezogen wird, entspricht, und
    Gleitmitteln, die es beiden Folgeformwalzen (23) ermöglichen, sich gleichzeitig miteinander und symmetrisch in Bezug auf ein Zentrum der Hauptformwalze (19) entlang den beiden jeweiligen Tangenten (T) an die gekrümmte Oberfläche (65) der Hauptformwalze (19) an deren gegenüberliegenden Endpunkten zu bewegen,
       wobei das Gleitmittel ein paar linker und rechter Gleitbügel (22) zum jeweiligen Haltern der Folgeformwalzen (23), eine Einstell-Schraubachse (27) und ein Paar linker und rechter, auf die Einstell-Schraubachse (27) aufgeschraubter konischer Blöcke (24L,24R) umfasst, so dass, wenn die Einstell-Schraubachse (27) gedreht wird, die linken und rechten konischen Blöcke (24L,24R) gleichzeitig entgegengesetzt zueinander entweder aufeinander zu oder voneinander weg entlang der Einstell-Schraubachse (27) bewegt werden, und
       wobei beide Gleitbügel (22) im Gleitkontakt mit den jeweiligen konischen Blöcken (24L,24R) stehen, so dass die Gleitbügel (22) zusammen mit den Folgeformwalzen (23) entlang den jeweiligen Tangenten (T) durch die Drehbetätigung der Einstell-Schraubachse (27) bewegt werden, wodurch eine Reduktion im Durchmesser des Stahlrohrs (P) eingestellt bzw. angepaßt wird,
       dadurch gekennzeichnet, dass
       die Gleitbügel (22) jeweils mit Gleitflächen (38) parallel zu den jeweiligen Tangenten (T) ausgebildet sind und die Gerüststruktur (2) mit einem Paar linker und rechter Neigungsflächen (44) parallel zu den jeweiligen Tangenten (T) ausgebildet ist, wobei die Neigungsflächen (44) in Gleitkontakt mit den Gleitflächen (38) der Gleitbügel (22) stehen.
EP20000114339 2000-07-04 2000-07-04 Reduzierwalzwerk mit drei Walzen zum Reduzieren eines durch Elektro-Widerstandschweissung erzeugten Rohres Expired - Lifetime EP1170068B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20000114339 EP1170068B1 (de) 2000-07-04 2000-07-04 Reduzierwalzwerk mit drei Walzen zum Reduzieren eines durch Elektro-Widerstandschweissung erzeugten Rohres
DE2000623282 DE60023282T2 (de) 2000-07-04 2000-07-04 Reduzierwalzwerk mit drei Walzen zum Reduzieren eines durch Elektro-Widerstandschweissung erzeugten Rohres

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20000114339 EP1170068B1 (de) 2000-07-04 2000-07-04 Reduzierwalzwerk mit drei Walzen zum Reduzieren eines durch Elektro-Widerstandschweissung erzeugten Rohres

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EP1170068A1 EP1170068A1 (de) 2002-01-09
EP1170068B1 true EP1170068B1 (de) 2005-10-19

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CN103846283B (zh) * 2014-03-18 2016-04-06 中冶赛迪工程技术股份有限公司 叠层传动紧凑式多辊轧机
CN110548774B (zh) * 2019-09-24 2021-06-22 郑州市立峰工贸有限公司 一种四棱异形棒加工模具

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Publication number Priority date Publication date Assignee Title
DE901043C (de) * 1951-04-25 1954-01-07 Westdeutsche Mannesmannroehren Streckrollenkopf fuer Rohrstreckmaschinen
FR2469962A1 (fr) * 1979-11-21 1981-05-29 Vallourec Procede et dispositif pour la fabrication d'un tube d'acier sans soudure par laminage a chaud sur mandrin
JPS6018208A (ja) * 1983-07-11 1985-01-30 Nippon Steel Corp ３ロ−ル式圧延機
JP3550249B2 (ja) * 1996-03-28 2004-08-04 日下部電機株式会社 鋼管の管径絞り装置

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DE60023282D1 (de) 2006-03-02
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