WO2011073757A1 - Rouleau composite - Google Patents

Rouleau composite Download PDF

Info

Publication number
WO2011073757A1
WO2011073757A1 PCT/IB2010/003178 IB2010003178W WO2011073757A1 WO 2011073757 A1 WO2011073757 A1 WO 2011073757A1 IB 2010003178 W IB2010003178 W IB 2010003178W WO 2011073757 A1 WO2011073757 A1 WO 2011073757A1
Authority
WO
WIPO (PCT)
Prior art keywords
insert
roller
accordance
copper alloy
support
Prior art date
Application number
PCT/IB2010/003178
Other languages
English (en)
Inventor
Renato Railz
Original Assignee
Eurolls S.P.A.
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 Eurolls S.P.A. filed Critical Eurolls S.P.A.
Publication of WO2011073757A1 publication Critical patent/WO2011073757A1/fr

Links

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
    • 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
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls

Definitions

  • the present invention relates to a composite roller.
  • it relates to composite rollers applicable to all industrial processes of cold-rolling, forming, but also hot-rolling and to all sub- processes related to them, such as for example scaling, straightening, stretching at the yield point or beyond, for towing or simply for guiding materials being processed.
  • the composite rollers comprise at least one insert made of sintered material surrounded at least partially by a copper alloy support.
  • tungsten carbide is used as insert.
  • Tungsten carbide combines high hardness, which distinguishes it, with good toughness.
  • the fixing of the insert to the support is usually carried out by interference fit, and/or in conjunction with fittings such as ring nuts and/or flanges suitable for partially/totally counteracting the movement of the insert with respect to the support.
  • the bond between the two materials is ensured by a layer, the thickness of which varies on average between 1 and 5 mm, wherein the two materials weld together.
  • This entails that the sintered material and the molten material of cast iron must be subjected together to the temperature rise (approximately 1200 °C) necessary for the welding of the two materials and furthermore entails the necessity of having to exert pressure on the molten cast iron to improve the welding between the materials. For this reason, in many cases, centrifuges are used.
  • the aim of the present invention is that of providing a composite roller which overcomes the problems of the prior art.
  • a composite roller comprising at least one insert made of sintered material, characterized in that it is surrounded at least partially by a copper alloy support comprising: Cu, Fe, Ni, Al, Zn.
  • the Applicant has thought of using alloys for the casting, which contain elements that are capable of forming chemical bonds with the components of hard metal at significantly lower temperatures than those of the known methods.
  • alloys that can be used in the preferential form are industrial copper alloys (aluminium bronze) containing sufficient quantities of zinc: the presence of zinc in significant quantities allows the formation of a superficial chemical bond with the cobalt present in the sintered element (HM): the cobalt transfers from the surface of the sintered element into the molten alloy and the zinc migrates inside the sintered element through the micro-channels previously filled by the cobalt.
  • HM sintered element
  • Such bonds begin to form at the temperature of 700 °C, well below the casting temperature of the alloy.
  • the Zn-Co bonding phenomena albeit superficial so as not to alter the characteristics of the sintered element and not to produce notch effects, contribute efficiently to anchorage between the insert and the molten support.
  • This type of alloys in addition to ensuring outstanding anchorage, ensures above all outstanding workability and tool life in industrial production processes.
  • the anchorage of the HM to the molten support is ensured by the volumetric shrinkage during solidification, which allows strong adhesion and containment of the ring.
  • the shrinkage is such as to guarantee, on the one hand, the containment and to avoid, on the other hand, excessive internal stressing of the ring due to solidification.
  • Such anchorage is also favoured by semi-spheroidal or semi-ellipsoidal notches realized in the HM ring.
  • figure 1 schematically shows a perspective view of a composite roller in accordance with a first embodiment of the present invention
  • figure 2 schematically shows a sectional view of a composite roller in accordance with a first embodiment of the present invention
  • figure 3 schematically shows a sectional view of a composite roller in accordance with a second embodiment of the present invention
  • figure 4 schematically shows a sectional view of an insert in accordance with a first embodiment of the present invention
  • figure 5 schematically shows a sectional view of an insert in accordance with a second embodiment of the present invention
  • figure 6 schematically shows a sectional view of an insert in accordance with a third embodiment of the present invention.
  • a composite roller in accordance with the present invention comprising a support 10 constituted by an alloy that surrounds at least partially an insert 11 made of sintered material.
  • the alloy of the support 10 is a copper alloy of the aluminium bronze type containing sufficient quantities of zinc.
  • it preferably and mainly comprises Copper (Cu), Iron (Fe), Nickel (Ni), Aluminium (Al), Zinc (Zi).
  • Al in a quantity between 8 % and 15.6%
  • Zn in a quantity between 7% and 10%
  • Si in a quantity between 0% and 1.1 %.
  • Such copper alloy has a casting temperature of less than 1100 °C and presents the following characteristics: tensile strength at break R between 550 and 700 N/mm 2 , yield strength Rp0.2 between 210 and 280 N/mm 2 , Brinell hardness HB between 180 and 240.
  • the insert 11 made of sintered material is made of tungsten carbide, which preferably comprises:
  • the working temperature was approximately 900 °C and a tensile strength at break R of 650 N/mm 2 , a yield strength Rp0.2 of 240 N/mm 2 and a Brinell hardness HB of 195 were achieved.
  • the form of the section of the notches 12 is preferably that of a semi-sphere or a semi-ellipsoid in order to avoid cracks and initiations of cracks.
  • the insert 11 has a toroidal form with the section having different forms. Its external side can have different types of profiles depending on the use of the same, and it can for example be a pointed insert 13, a flat insert 14 or a concave insert 15.
  • the sidewalls are constituted by two rectilinear crop-ends 20 and 21 , of equal or different lengths, divided by the intersection point 22.
  • the crop-end 20 is parallel to the transverse central axis
  • the crop-end 21 is inclined, with respect to the transverse central axis, at an angle ⁇ between 3° and 10°.
  • the copper alloy is melted in a die in which the insert has been prearranged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Powder Metallurgy (AREA)
  • Massaging Devices (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

L'invention concerne un rouleau composite comprenant au moins un insert (11) composé de matériau fritté, caractérisé en ce que ledit insert (11) est entouré au moins partiellement d'un support en alliage de cuivre constitué de Cu, Fe, Ni, A1, Zn.
PCT/IB2010/003178 2009-12-16 2010-12-03 Rouleau composite WO2011073757A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBG2009A000065A IT1397688B1 (it) 2009-12-16 2009-12-16 Rullo composto
ITBG2009A000065 2009-12-16

Publications (1)

Publication Number Publication Date
WO2011073757A1 true WO2011073757A1 (fr) 2011-06-23

Family

ID=42272127

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2010/003178 WO2011073757A1 (fr) 2009-12-16 2010-12-03 Rouleau composite

Country Status (2)

Country Link
IT (1) IT1397688B1 (fr)
WO (1) WO2011073757A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBG20120052A1 (it) * 2012-12-05 2014-06-06 Renato Railz Rullo di laminazione

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609849A (en) * 1969-04-09 1971-10-05 Jan M Krol Forming rolls
JPS63168207A (ja) * 1986-12-27 1988-07-12 Sumitomo Metal Ind Ltd 複合圧延用ロ−ル
US5040398A (en) * 1988-10-14 1991-08-20 Hitachi, Ltd. Ceramic sleeve incorporated rolling roll
EP0630713A1 (fr) * 1993-06-25 1994-12-28 Saar-Hartmetall Und Werkzeuge Gmbh Corps composite fabriqué à partir de matériaux à propriétés thermiques et mécaniques différentes
EP0655295A1 (fr) * 1993-11-25 1995-05-31 Günter Schroeder Corps métallique et procédé pour sa fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3609849A (en) * 1969-04-09 1971-10-05 Jan M Krol Forming rolls
JPS63168207A (ja) * 1986-12-27 1988-07-12 Sumitomo Metal Ind Ltd 複合圧延用ロ−ル
US5040398A (en) * 1988-10-14 1991-08-20 Hitachi, Ltd. Ceramic sleeve incorporated rolling roll
EP0630713A1 (fr) * 1993-06-25 1994-12-28 Saar-Hartmetall Und Werkzeuge Gmbh Corps composite fabriqué à partir de matériaux à propriétés thermiques et mécaniques différentes
EP0655295A1 (fr) * 1993-11-25 1995-05-31 Günter Schroeder Corps métallique et procédé pour sa fabrication

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITBG20120052A1 (it) * 2012-12-05 2014-06-06 Renato Railz Rullo di laminazione
WO2014087304A1 (fr) * 2012-12-05 2014-06-12 Renato Railz Rouleau de laminage

Also Published As

Publication number Publication date
IT1397688B1 (it) 2013-01-24
ITBG20090065A1 (it) 2011-06-17

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