EP0477147A1 - Dispositif pour le moulage continu de barres métalliques - Google Patents

Dispositif pour le moulage continu de barres métalliques Download PDF

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Publication number
EP0477147A1
EP0477147A1 EP91830375A EP91830375A EP0477147A1 EP 0477147 A1 EP0477147 A1 EP 0477147A1 EP 91830375 A EP91830375 A EP 91830375A EP 91830375 A EP91830375 A EP 91830375A EP 0477147 A1 EP0477147 A1 EP 0477147A1
Authority
EP
European Patent Office
Prior art keywords
bar
die
grinding
bars
drawn
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.)
Withdrawn
Application number
EP91830375A
Other languages
German (de)
English (en)
Inventor
Ezio Cinato
Walter Tredici
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.)
Ilva SpA
Original Assignee
Ilva SpA
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 Ilva SpA filed Critical Ilva SpA
Publication of EP0477147A1 publication Critical patent/EP0477147A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B21C43/00—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
    • B21C43/02—Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass combined with or specially adapted for use in connection with drawing or winding machines or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/38—Single-purpose machines or devices for externally grinding travelling elongated stock, e.g. wire

Definitions

  • This invention concerns a device for the continuous grinding of metal bars. More precisely it concerns a device which can perform this operation on products of any cross-section, whether round or polygonal, and of indefinite length.
  • one of the main requirements is the absence - preferably complete - of surface defects, where cracks may be initiated.
  • the hot-rolled feed material in the form of a coil of indefinite length or bars cut to measure, is drawn.
  • plastic deformation generally cold, which reduces the cross-section to approximately that desired. It is impossible to eliminate surfece defects during this operation, but this state of affairs is rectified by grinding which is presently performed by totating wheels that eliminate the surface layer and bring the product to the desired final shape.
  • the present invention is designed to overcome these drawbacks and to provide a device for the continuous grinding of bars that may even be of indefinite length, and of accepting products of any desired cross-section.
  • the drawing machine is replaced by a device consisting of a cage containing a first die, grinding means and a second die arranged along the direction of travel of the bar.
  • the first die has a hole of the same shape as that of the bar leaving the rolling mill, but with a smaller cross-section.
  • the grinding means proper consist of at least one cutter which strips a layer of desired thickness from the bar.
  • the second die has a hole whose shape and cross-section are about the same as the required finished bar.
  • the distance between said grinding means and said dies is preferably between three and five times the diameter of the bar, so that said dies support the latter perfectly in position vis-à-vis the grinding means.
  • the dies and the grinding means are mounted in a rigid structure or cage, said structure being open between the first die and the grinding means so as to permit the removal of the cuttings, and is closed between the grinding means and the second die, so that a lubricant under pressure can be introduced into the space thus bounded to permit the second die to operate without seizure.
  • the grinding unit proper consists of at least one cutter.
  • the cutter can consist of a metal plate in which there is a sharp-edged hole of the desired diameter, perhaps hardened by surface treatment or plated or covered with hard metallic or ceramic coatings.
  • the bar in question has a polygonal cross-sectionhexagonal for instance - pairs of appropriately-positioned, counterposed cutters set at the desired distance can be employed; a plate with a polygonal hole can also be used.
  • the layer to be eliminated from the surface of the bar can be removed by successive treatments, by positioning at least two cutting elements with progressively smaller holes, in a sequence along the direction of travel of the bar.
  • a coiled bar is straightened in straightener 2, drawn in 3, cut into lengths 4, which are stored in 5, and then are ground one by one in plant 6 and made up into bundles 7.
  • Fig.2 provides a schematic sectional view of the drawing and grinding device as per the invention, which consists of a cage 30 carrying a first die 31, a cutter 32 maintained at the desired distance from the first die by a distance-piece 35, and a second die 33, separated from the cutter by a distance-piece 36.
  • the hot-rolled bar B which travels in the direction indicated by the arrow, is centred vis-à-vis the cutter 32 by dies 31 and 33, and is drawn in 31, ground by cutter 32 and reduced to the final desired size by die 33.
  • Cage 30 is divided into two parts with dies and cutter in the first part 301, which has open sides to facilitate removal of cuttings produced by cutter 32, and a second part 302, which is closed so it can be filled through pipe 37, preferably by lubricant under pressure in order to reduce friction between bar and die, thus favouring gauging.
  • a prototype device as per the invention has permitted the continuous treatment of 4000 kg of bar without any stoppages or other drawbacks and with final surface tolerances and quality completely within specification.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Metal Extraction Processes (AREA)
EP91830375A 1990-09-14 1991-09-12 Dispositif pour le moulage continu de barres métalliques Withdrawn EP0477147A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT48282A IT1242136B (it) 1990-09-14 1990-09-14 Dispositivo per la rettifica di barre metalliche in continuo.
IT4828290 1990-09-14

Publications (1)

Publication Number Publication Date
EP0477147A1 true EP0477147A1 (fr) 1992-03-25

Family

ID=11265678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91830375A Withdrawn EP0477147A1 (fr) 1990-09-14 1991-09-12 Dispositif pour le moulage continu de barres métalliques

Country Status (2)

Country Link
EP (1) EP0477147A1 (fr)
IT (1) IT1242136B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657229A1 (fr) * 1993-12-09 1995-06-14 Air Liquide America Corporation Nettoyage cryogénique de pièces allongées
CN104416427A (zh) * 2013-08-20 2015-03-18 南通新源特种纤维有限公司 一种金属线打磨装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2237692A1 (en) * 1973-07-18 1975-02-14 Salle Steel Cy Surface finishing wire, bars, and rods - by removal of surface imperfections followed by sizing and polishing
FR2300655A1 (fr) * 1975-02-13 1976-09-10 Revigny Soc Metall Machine de polissage de tiges ou de fils en metal
DE3602672A1 (de) * 1985-01-31 1986-08-14 NPSP po chidroplastična obrabotka na metalite, Gabrovo Vorrichtung fuer das hydromechanische reinigen und polieren von stabfoermigen koerpern

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2237692A1 (en) * 1973-07-18 1975-02-14 Salle Steel Cy Surface finishing wire, bars, and rods - by removal of surface imperfections followed by sizing and polishing
FR2300655A1 (fr) * 1975-02-13 1976-09-10 Revigny Soc Metall Machine de polissage de tiges ou de fils en metal
DE3602672A1 (de) * 1985-01-31 1986-08-14 NPSP po chidroplastična obrabotka na metalite, Gabrovo Vorrichtung fuer das hydromechanische reinigen und polieren von stabfoermigen koerpern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657229A1 (fr) * 1993-12-09 1995-06-14 Air Liquide America Corporation Nettoyage cryogénique de pièces allongées
CN104416427A (zh) * 2013-08-20 2015-03-18 南通新源特种纤维有限公司 一种金属线打磨装置

Also Published As

Publication number Publication date
IT9048282A1 (it) 1992-03-14
IT1242136B (it) 1994-02-16
IT9048282A0 (it) 1990-09-14

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