Plural Passes Spaced Along Axis Of One Roller Of Tool-couple Patents (Class 72/221)
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Patent number: 11292039Abstract: A large-size H-shaped steel product is produced by performing a rough rolling step including an edging rolling step of rolling and shaping a material to be rolled into a predetermined almost dog-bone shape, and a flat rolling step of performing rolling of a web part by rotating the material to be rolled after completion of the edging rolling step by 90° or 270°, upper and lower caliber rolls of at least one caliber of calibers configured to perform the flat rolling step include recessed parts configured to form a raised part at a middle of a web part of the material to be rolled, the recessed parts being provided at roll barrel length middle parts of the upper and lower caliber rolls.Type: GrantFiled: January 11, 2019Date of Patent: April 5, 2022Assignee: NIPPON STEEL CORPORATIONInventor: Hiroshi Yamashita
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Patent number: 10730087Abstract: [Object] To produce an H-shaped steel product with a flange width larger than a conventional flange width by, in a rough rolling step using calibers in producing H-shaped steel, creating deep splits on end surfaces of a material (e.g., slab) using projections with acute-angle tip shapes, and sequentially bending flange portions formed by the splits. [Solution] Provided is a method for producing H-shaped steel using a slab as a material. In a rolling mill that performs a rough rolling step, a plurality of calibers to shape a material to be rolled, and a web thinning caliber to thin a web of the material to be rolled that has been shaped in the plurality of calibers are engraved, the number of the plurality of calibers being three or more. Shaping of a plurality of passes is performed on the material to be rolled in part or all of the plurality of calibers.Type: GrantFiled: March 10, 2016Date of Patent: August 4, 2020Assignee: NIPPON STEEL CORPORATIONInventor: Hiroshi Yamashita
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Patent number: 10730086Abstract: [Object] To suppress occurrence of shape defects in a material to be rolled and enable efficient and stable production of an H-shaped steel product with a flange width larger than a conventional flange width by creating deep splits on end surfaces of a material (e.g., slab) using projections with acute-angle tip shapes, and sequentially bending formed flange portions. [Solution] Provided is a method for producing H-shaped steel, the method including: a rough rolling step; an intermediate rolling step; and a finish rolling step. In a rolling mill that performs the rough rolling step, a plurality of calibers to shape a material to be rolled are engraved, the number of the plurality of calibers being four or more. Shaping of one or a plurality of passes is performed on the material to be rolled in the plurality of calibers. In a first caliber and a second caliber among the plurality of calibers, projections to create splits vertically with respect to a width direction of the material to be rolled are formed.Type: GrantFiled: March 10, 2016Date of Patent: August 4, 2020Assignee: NIPPON STEEL CORPORATIONInventor: Hiroshi Yamashita
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Patent number: 10500779Abstract: A calibration device for a calibration, in particular wet calibration of an extrusion device is provided. The calibration device comprises a calibrating element which includes an opening for guiding through a profile produced by means of an extrusion die of the extrusion device and at least one rotatable guide roller which is in contact with the profile when the profile is guided through the opening. The calibration device further comprises at least one separate bearing element insertable into a cutout of the calibrating element, via which the guide roller can rotatably be mounted on the calibrating element.Type: GrantFiled: May 23, 2014Date of Patent: December 10, 2019Assignee: GREINER TOOL. TEC GMBHInventors: Bernhard Fischer, Gerhard Anders, Leopold Weiermayer, Erwin Krumböck
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Publication number: 20150132597Abstract: The invention relates to a method and device for producing metal sections having two profile flanges arranged opposite one another and having flange inner faces that are to be kept apart from each other by a closely toleranced final chamber dimension. In order to adapt the chamber dimension from a starting chamber dimension K0 to a desired final chamber dimension K1, the metal section is passed through the device, which forms working gaps between an inner working roll pair and outer support rolls. The working rolls that form the inner working roll pair roll over each other in order to brace the forming forces exerted on the working roll pair from the flange inner faces against each other.Type: ApplicationFiled: May 13, 2011Publication date: May 14, 2015Applicant: MANNSTAEDT GmbHInventors: Peter Engel, Alexander Becker, Thomas Voss
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Patent number: 9021706Abstract: A method of manufacturing large diameter tapered roller bearing cages includes beginning with a metal strip, coil or plate of cage blank material and feeding it into a rolling mill. The rolling mill includes a pair of unparallel forming rolls disposed to define a wedge-shaped gap therebetween. As the cage blank material is fed through the wedge-shaped gap, one lateral side of the cage blank material is plastically deformed to reduce its thickness and to elongate its length, while slight or no deformation is introduced into the other lateral side, thus forming the cage blank into an arc shape. A third roll disposed at the exit side of the forming rolls bends the rolled cage blank into a circular conical ring. Adjacent butt ends of the formed conical ring cage blank are aligned and joined together during the assembly process to form the large diameter tapered roller bearing cage.Type: GrantFiled: January 28, 2011Date of Patent: May 5, 2015Assignee: The Timken CompanyInventors: Ming He, Michael D. Simmons
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Patent number: 8109125Abstract: A method for manufacturing ultralow-resistance current sensors of size 0402 to 4518 of IEEE specifications includes the steps of: a raw metallic strip being pressed to roll over a first tension roller, a cutting tool over the first tension roller being fed to cut the raw metallic strip so as to form a deep groove thereof along the moving metallic strip, an insulating material being filled into and along the deep groove so as to form an lengthwise insulating portion of the metallic strip, and the metallic strip with the insulating portion being segmented into a plurality of ultralow-resistance current sensors.Type: GrantFiled: December 3, 2008Date of Patent: February 7, 2012Inventor: Jen-Huan Pan
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Publication number: 20100330389Abstract: According to at least one aspect of the present invention, a method is provided for cladding a thin metal sheet for enhanced formability and manufacturability thereof. In at least one embodiment, the method includes contacting at least one metal cladding layer with the thin metal sheet to form a thin metal sandwich having an original thickness, wherein the metal cladding layer may be a thin metal foil or a plated or deposited thin metal film, and then subjecting the thin metal sandwich to four Skin-Pass steps at an incremental thickness reduction ratio of 25 percent of the total thickness Reduction Ratio per step in four alternating directions. The method provides Skin-Pass processed clad sheet metals with reduced uniaxial pre-strain, improved uniformity in microstructure and material properties along the longitudinal and transversal directions, and enhanced formability and manufacturability.Type: ApplicationFiled: June 25, 2009Publication date: December 30, 2010Applicant: FORD MOTOR COMPANYInventor: Huimin Liu
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Publication number: 20090165517Abstract: A hot-rolling plant (50) for the production of metal strips comprising a roughing stand (2), a reheating furnace (3) or a maintenance tunnel for maintaining the temperature of the product, a pre-finishing mill train (4), comprising three or four stands, a finishing mill train (5), comprising two or three stands, for finishing the product, in which the work rolls of one stand are provided with their own motor drive, independent one from each other, so as to allow the peripheral speeds of both of said work rolls to be autonomously varied under rolling load.Type: ApplicationFiled: April 2, 2007Publication date: July 2, 2009Applicant: DANIELI & C. OFFICINE MECCANICHE S.P.A.Inventors: Milorad Pavlicevic, Alfredo Poloni, Simone Barcherini, Gianluca Bazzaro
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Publication number: 20080302160Abstract: Roll forming a round tube to a square tube without applying excessive load to the raw tube scheduled portions to become corner portions and shoulder portions. This invention structures the curvature of the rotation axis direction of the forming roll surface in a way that in relation to other raw tube locations (straightening precedes for the raw tube locations adjacent to the corner portion scheduled locations of the square tube. It disposes stands of four-direction roll structure at the forming roll stand furthest upstream and furthest downstream sides and disposes stands of upper-lower and left-right two-direction roll structure between the upstream and downstream roll stands, and by adopting forming roll with a structure having a curvature for constricting the raw tube locations to become the shoulder portions adjacent to the corner portions of the square tube at a smaller curvature than that constricting the raw tube portions to become the side portion centers of the square tube cross section.Type: ApplicationFiled: December 27, 2004Publication date: December 11, 2008Applicant: Nakata Manufacturing Co., Ltd.Inventors: Feizhou Wang, Tomoyasu Nakano, Manabu Kiuchi
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Patent number: 7251890Abstract: A method for producing a wheel pan includes cold-rolling a rectangular metal strip of a given uniform thickness by conical rolls into a semicircular ring, such that the thickness reduction on the outer edge of the curved strip is at least 20%, and the circumference of the semicircular ring thus produced extends 130-310°, preferably 180°; bending the semicircular ring into a complete circle to produce a conical hoop, welding the ends together; and shaping the hoop to form the bottom of the pan.Type: GrantFiled: April 27, 2004Date of Patent: August 7, 2007Assignee: Michelin Kronprinz Werke GmbHInventor: Bruno Atts
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Patent number: 6647604Abstract: A rolling system has a die having a row of separate throughgoing passages for producing a plurality of continuously advancing and parallel hot metal strands and a plurality of pinch rollers for pulling the strands out of the die and moving them in a direction along a path. A vertical-roll stand on the path receives the strands and horizontally compresses them. A horizontal-roll stand on the path aligned in the direction with the vertical-roll stand receives the strands and vertically compresses them. The rolls are rotated to draw the strands downstream.Type: GrantFiled: February 14, 2002Date of Patent: November 18, 2003Assignee: SMS Demag AktiengesellschaftInventor: Ferruccio Sclippa
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Patent number: 6564608Abstract: Rolling method and line for rails or other sections starting from a steel bar, including a roughing step and a finishing step. The roughing step provides use of a two-high reversible roughing stand, or BDM (Break-Down Mill), associated with a reversible edging stand (RES), which can be located irrespectively upstream or downstream of the BDM stand.Type: GrantFiled: August 27, 2001Date of Patent: May 20, 2003Assignee: Daniel & C. Officine Meccaniche SpaInventors: Loris Maestrutti, Giorgio Lavaroni, Stefano Zuttion
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Publication number: 20030037583Abstract: Rolling method and line for rails or other sections starting from a steel bar, including a roughing step and a finishing step. The roughing step provides use of a two-high reversible roughing stand, or BDM (Break-Down Mill), associated with a reversible edging stand (RES), which can be located irrespectively upstream or downstream of the BDM stand.Type: ApplicationFiled: August 27, 2001Publication date: February 27, 2003Inventors: Loris Maestrutti, Giorgio Lavaroni, Stefano Zuttion
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Publication number: 20020023471Abstract: A pair of rolling machines are arranged in series in alignment with a pass line along which a workpiece to be rolled is passed. The center distance between the first rolls of the first rolling machine and second rolls of the second rolling machine is designed to be not more than 1.5 times the roll diameter. The rotational axes of the first rolls are displaced by an angle of 90° from those of the second rolls and are inclined at an angle of 45° respectively with respect to the horizontal plane. A plurality of dual-purpose calibers are defined between the rolls of the rolling machines to be arranged in the axial direction, respectively. The rolls are shifted in crossing directions to the pass line respectively so as to bring desired dual-purpose calibers in alignment with the pass line.Type: ApplicationFiled: June 28, 2001Publication date: February 28, 2002Applicant: DAIDO TOKUSHUKO KABUSHIKI KAISHAInventors: Teruaki Tanaka, Kunihito Kawanishi
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Patent number: 4779439Abstract: A method to roll multiple sections starting from a single round section, comprising the steps of: (a) passing the single round section between the rolls of a rolling mill to obtain a single bar including two substantially elliptical, united, twin sections, the major axes of the elliptical sections being inclined by an angle ranging between 5.degree. and 30.degree. in relation to an axis normal to the axes of the rolling rolls; and (b) passing the single bar including two substantially elliptical, united, twin sections between the rolls of a rolling mill to obtain twin-strand round sections.Type: GrantFiled: December 10, 1986Date of Patent: October 25, 1988Assignee: Cerit S.p.A.Inventor: Ezio Baldi
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Patent number: 4720989Abstract: An I-beam blank is rolled from a bloom by rolling into opposite edges of the bloom respective central triangular section notches of predetermined apex angle, apex radius of curvature, width, and height in a succession of roll passes. According to this invention the radius and apex angle of the notches are progressively increased a plurality of times during the succession of roll passes. Then the notches are pressed by rolling generally out of the bloom edges in at least one final rolling pass, thereby flattening these edges. The rolling passes are carried out between respective pairs of rolls having facing grooves bases and the roll pairs of the grooving steps are formed with respective triangular-section ridges complementary to the notches being formed. In addition the bloom is rolled repeatedly in the first pair of grooves until the material of the bloom flanking the notch mainly fills these grooves, that i until the bloom bottoms in the grooves.Type: GrantFiled: June 13, 1986Date of Patent: January 26, 1988Assignee: Arbed S.A.Inventors: Carlo Panunzi, Henri Grober, Joseph Sbarra, Albert Zenner
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Patent number: 4494395Abstract: A hot-rolling plant comprises forward and rear reversible coilers, a reversible finishing stand disposed between the coilers, and crop shears including upper and lower cutter cylinders. To permit trimming of the stock to be rolled between finishing passes, the crop shears are disposed between the finishing stand and the rear reversible coiler, and a backing roller for supporting the stock is rotatably mounted on the lower cutter cylinder on an axis which is parallel to the axis of rotation of the lower cutter cylinder.Type: GrantFiled: February 22, 1983Date of Patent: January 22, 1985Assignee: Voest-Alpine AktiengesellschaftInventors: Franz Brettbacher, Buchegger Rudolf
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Patent number: 4471642Abstract: A rod, bar or section mill has a train of rolling mill stands, each of which is attached to a bed plate with which the stand is introduced into, and withdrawn from, the mill. The bed plate carries pedestals on which are secured guides; those guides can be properly located on the bed plate prior to entry of the stand into the mill; on the stand being positioned in the mill, the guides are then automatically located relative to the pass-line and the down-time of the mill on stand replacement is reduced.Type: GrantFiled: January 26, 1982Date of Patent: September 18, 1984Assignee: Hille Engineering Company LimitedInventor: Alexander I. Wilson
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Patent number: 4457154Abstract: When two strand workpieces pass through a roll opening between two grooved working rolls on a roll stand so as to be rolled, the trailing end of one of them may leave the rolls and cause change in the roll separation. At that time mating bilateral screw-down devices are remotely controlled to adjust the roll opening at least at the position of the remaining workpiece. Alternatively in a multi-strand tandem rolling mill, the rolling speeds on roll stands upstream of a roll stand which one of the strand workpieces has left are changed by a speed ratio of (1-b.sub.2)/(1-b.sub.1) where b.sub.1 and b.sub.2 respectively designate rates of backward slip when two strand workpieces are being rolled and in the absence of one of the strand workpieces from the last-mentioned roll stand. Alternatively the roll speeds on roll stands downstream of the roll stand which one of the strand workpieces has left may be changed by a speed ratio of (1+f.sub.2)/(1+f.sub.1) where f.sub.1 and f.sub.Type: GrantFiled: April 4, 1983Date of Patent: July 3, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Koichi Ohba
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Patent number: 4420961Abstract: A rough rolling process for forming a beam blank for a universal beam from a flat slab, comprises the steps of making a triangular slit of a predetermined apical angle in each of longitudinal side edges of said flat slab and gradually deepening said slit with the apical angle thereof fixed; and widening the slit after the depth of said slit has reached a predetermined value.Type: GrantFiled: June 10, 1982Date of Patent: December 20, 1983Assignee: Sumitomo Metal Industries, Ltd.Inventors: Yoshiaki Kusaba, Chihiro Hayashi
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Patent number: 4408475Abstract: The present invention discloses an arrangement of grooves on the rolls of a rolling mill stand intended particularly for the rolling of beams, rails, channels, squares, diamonds, rounds, tie plates, joint bars and similar shapes wherein a plurality of grooves for shapes with different web heights are nested on the same set of rolls in such a way that the whole of the part of a groove serving as a surround to the shortest web is common to all the nested grooves.Type: GrantFiled: February 2, 1981Date of Patent: October 11, 1983Assignee: Sacilor Acieries et Laminoirs de LorraineInventor: Gabriel B. Mennel
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Patent number: 4404834Abstract: A rod-shaped material is reciprocated along a conveyance line while being supported by a plurality of rollers. The material is allowed to pass through a rolling device disposed in the middle of the conveyance line a number of times for rolling operation during reciprocation or conveyance. A pair of rotating devices are disposed on both sides of the rolling device for varying the rolling angle of the material so that a desired rolling may be effected to the material.Type: GrantFiled: August 21, 1981Date of Patent: September 20, 1983Assignee: Daidotokushuko KabushikikaishaInventor: Teruaki Tanaka
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Patent number: 4402206Abstract: A method of rolling raw materials inclusive of slabs for the manufacture of beam blanks, and a roll to be used therefor, are disclosed. This method includes the steps of (a) subjecting a raw material, whose section consists of a web portion and a flange portion(s) having a width wider than the thickness of the web portion, to such a partial rolling that the web portion is partially rolled at regions inclusive of at least the joints of the flange portion(s), except the remaining central region, among a plurality of regions divided in the widthwise direction of the web portion, and (b) subjecting only the remaining central regions to a rolling.Type: GrantFiled: May 20, 1981Date of Patent: September 6, 1983Assignee: Kawasaki Steel CorporationInventors: Tadaaki Yanazawa, Teruaki Tanaka, Masashi Yamashita, Takashi Ehiro, Hiroshi Okumura, Shinzo Saito, Takashi Kusaba
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Patent number: 4393679Abstract: A blank for a wide flange beam is produced by feeding a flat slab to a break-down mill in which a box caliber, one or more forming calibers and a sizing caliber are formed by a pair of rolls, and rolling the material in a former stage of the rolling process so that the rectangular ratio of the rolled material is substantially equal to the rectangular ratio of the slab.Type: GrantFiled: November 21, 1980Date of Patent: July 19, 1983Assignee: Sumitomo Metal Industries, Ltd.Inventor: Yoshiaki Kusaba
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Patent number: 4393680Abstract: A method for rolling rails is provided wherein the final rolling operation includes processing of a rail blank in a leader pass universal mill stand and in a finishing pass universal mill stand. Both mill stands have horizontal rolls that form two roll passes, one of which is the leader roll pass and the other is a finishing roll pass. The rolls or the entire mill stands are interchanged from a previous location in a mill train to use an unused roll pass at the previous location, thereby doubling the roll life and eliminating the need to manipulate or otherwise handle the rail blank for passes in the mill stands.Type: GrantFiled: July 30, 1981Date of Patent: July 19, 1983Assignee: SMS Schloemann-Siemag, Inc.Inventor: Daniel C. Kovacs
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Patent number: 4380916Abstract: A material is allowed to reciprocate along a conveyance line by conveyance systems. During reciprocation, the material is allowed to pass through different shape apertures provided by a rolling mechanism in the direction perpendicular to the conveyance line so that a desired rolling operation may be effected to the material.Type: GrantFiled: August 21, 1981Date of Patent: April 26, 1983Assignee: Daidotokushuko KabushikikaishaInventor: Teruaki Tanaka
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Patent number: 4362041Abstract: A method of forming a beam blank, wherein:said method comprises:a process in which a plate-shaped slab is reduction-rolled in the widthwise direction by means of working rolls having box calibers each formed at the center thereof with a belly, whereby side spreadings are generated at opposite end portions in the widthwise direction of said slab to provide a blank of being a dog-bone shape in cross-section; anda process in which said blank is rolled by means of working rolls having beam blank calibers to provide a beam blank being of a predetermined shape in cross section; said process, in which the plate-shaped slab is reduction-rolled in the widthwise direction by means of the working rolls having the box calibers each formed at the center thereof with the belly, preferably comprising: a first step in which said plate-shaped slab is reduction-rolled in the widthwise direction by means of box calibers each formed at the center thereof with a belly to provide grooves for positioning in the centers at oppositeType: GrantFiled: September 3, 1980Date of Patent: December 7, 1982Assignee: Kawasaki Steel CorporationInventors: Teruyuki Nakanishi, Toshiyuki Akune, Takashi Kusaba, Takashi Ehiro
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Patent number: 4357819Abstract: Method and apparatus for splitting a single metal rod into three equal cross-section areas by passing the rod through pairs of rollers to form three connected equal areas, but not identically shaped strands, then applying a separating force to separate the rods into individual lengths.Type: GrantFiled: June 11, 1980Date of Patent: November 9, 1982Assignee: Structural Metals, Inc.Inventor: Dayton W. Elley
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Patent number: 4314469Abstract: A rolling mill comprising a roll stand which supports rolls provided with roll passes for rolling a blank to be rolled which is fed along a rolling line, the roll stand being supported on a stationary base so as to move in axial directions of the rolls perpendicular to the rolling line, wherein the roll stand is provided with rotatable eccentric rods which have rotatable wheels thereon, the rods being rotated to occupy a non-operation position in which the wheels are separated from the base and an operational position in which the wheels contact with the base so as to rotate on the base, thereby to carry the roll stand in axial directions of the rolls.Type: GrantFiled: April 30, 1980Date of Patent: February 9, 1982Assignee: Nippon Steel CorporationInventors: Takashi Kitamura, Yoshiro Sumi, Akira Matsufuji
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Patent number: 4268948Abstract: A tool for forming parting grooves in a flat, plastically deformable workpiece, especially a continuously cast steel slab in a manner which seals the internal porosity of the slab in the regions which become exposed upon division, has a working portion in the form of a ridge which is most preferably in the form of a circumferential flange on a roll; and the cross-sectional shape of the ridge or flange is that of a highly convex tip between two gently convex side faces, and optionally, or essentially if either or both of the tip and the side faces are instead straight, the angle at which the side faces are mutually inclined is 20.degree. to 60.degree., the width of the tip is a given porportion of the thickness of the workpiece, and the width of the tip is specifically related to the said angle of inclination of the side faces. The height of the side faces, and their curvature and that of the tip, are also preferably within set limits.Type: GrantFiled: February 12, 1979Date of Patent: May 26, 1981Assignee: British Steel Corp.Inventors: Per O. Strandell, Erik M. Thorslund, Colin R. MacKenzie, Norman Smith
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Patent number: 4204416Abstract: The invention relates to a method of rolling section billets in which billets interconnected by bridges are successively formed from a slab in a number of grooves defined by a plurality of transversely juxtaposed passes, with subsequent separation of billets from one another by effecting a relative displacement of adjacent billets by prevailingly acting with a groove on one of the sides of the adjacent billets at an angle other than 90.degree. to the roll axis when the bridge thickness becomes equal to 0.01-0.3 of the groove height.Type: GrantFiled: December 20, 1977Date of Patent: May 27, 1980Inventors: Julian M. Chumanov, Vyacheslav F. Gubaidulin, Grigory M. Shulgin, Viktor I. Pogorzhelsky, Vasily P. Morozov, Pavel A. Levichev, Jury P. Lyashenko, Anatoly G. Shalimov, Dmitry P. Evteev, Sergei P. Efimenko, Stanislav N. Ignatiev, Vladimir P. Slednev, Eduard V. Ovsy, Vladimir S. Solod, Valery V. Moiseenkov
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Patent number: 4201075Abstract: A method of rolling section billets wherein a plurality of billets transversely interconnected by bridges are successively simultaneously formed from a slab in a number of grooves defined by a plurality of transversely juxtaposed grooves. The forming is effected in two stages by reducing the value of longitudinal tensile stresses in central portions of the billets at one stage by changing the position of zones of prevailing reduction transversely of the billets, with the subsequent separation of billets from one another.Type: GrantFiled: February 6, 1978Date of Patent: May 6, 1980Inventors: Julian M. Chumanov, Valentin M. Klimenko, Grigory M. Shulgin, Vyacheslav F. Gubaidulin, Vladimir P. Timofeev, Vladimir P. Slednev, Stanislav N. Ignatiev, Pavel A. Levichev, Jury P. Lyashenko
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Patent number: 4199970Abstract: The present invention relates to plastic working of metals and the reducing of a workpiece along its axis by a pair of shaped rolls with formation in the workpiece of a transitional length whose cross section gradually changes from a starting one to several cross sections of finished bars interconnected by webs. The reduction of the workpiece is alternated with its axial displacement through one feed step, whereas at the end of a transitional length adjacent bars are displaced one with respect to another in opposite directions perpendicularly to webs so as to separate the bars. Mill rolls used with the method have several grooves of a variable cross section which form passes for rolling bars. The profile of each groove in transversal (with respect to mill roll axis of rotation) cross section is formed of two mutually conjugated arcs successively coming into contact with the workpiece. The grooves have an arc for reducing the workpiece and an arc for dividing bars one from another.Type: GrantFiled: June 7, 1978Date of Patent: April 29, 1980Inventors: Vladimir N. Vydrin, Evgeny N. Berezin, Oleg I. Tischenko, Vladimir G. Dremin, Grigory I. Koval
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Patent number: 4193283Abstract: In the high speed production of elongated metal bars, a method of slitting a double or triple stranded bar interconnected at a continuous node or nodes, in which the bar is rolled to reduce the cross-section of each strand equally, the compressive working force being applied to create lateral tensile forces whereby the strands diverge and separate. In a triple stranded bar the two outer strands are worked in the same manner to separate them from the central strand.Type: GrantFiled: August 21, 1978Date of Patent: March 18, 1980Assignee: Co-Steel International LimitedInventors: Raymond E. Bowman, Anthony Greaves
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Patent number: 4184353Abstract: A rolling mill having a roll stand with back-up rolls and two cylindrical work rolls. The work rolls have roll-pass grooves associated in pairs with different roll-pass areas. The driving mechanism of the rolling mill is coupled to the back-up rolls which exercise constant pressure on the work rolls during rolling so that these are in hard mutual contact and rotate with the back-up rolls. The work rolls are axially displaceable in the roll stands between the back-up rolls when the latter are open so that a desired roll-pass groove can be positioned with its center line coinciding with the central plane of the rolling mill.Type: GrantFiled: April 24, 1978Date of Patent: January 22, 1980Assignee: Stiftelsen For Metallurgisk ForskningInventors: Carl Sebardt, Bengt Orrling
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Patent number: 3996781Abstract: A rolling mill is provided for rolling wire, light sections and tubular products having a fixed rolling axis and a plurality of roll stands arranged directly one behind the other and each of which has two driven work rolls extending parallel to one another and transversely of the rolling direction, said work rolls of each stand defining at least two sizing passes only one of which is located on the rolling axis at one time while the other sizing passes of the stand are interchangeably located away from the rolling axis and act as stand-by passes.Type: GrantFiled: December 3, 1975Date of Patent: December 14, 1976Assignee: Firma Friedrich KocksInventor: Norbert Nuckel