EP0374116A1 - Walzring aus Hartmetall und Gusseisen und Verfahren zur Herstellung - Google Patents

Walzring aus Hartmetall und Gusseisen und Verfahren zur Herstellung Download PDF

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Publication number
EP0374116A1
EP0374116A1 EP89850432A EP89850432A EP0374116A1 EP 0374116 A1 EP0374116 A1 EP 0374116A1 EP 89850432 A EP89850432 A EP 89850432A EP 89850432 A EP89850432 A EP 89850432A EP 0374116 A1 EP0374116 A1 EP 0374116A1
Authority
EP
European Patent Office
Prior art keywords
carbide
ring
roll
iron
cast
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.)
Granted
Application number
EP89850432A
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English (en)
French (fr)
Other versions
EP0374116B1 (de
Inventor
Gert Sundstedt
Jan-Erik Carlsson
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.)
Sandvik AB
Original Assignee
Sandvik AB
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Filing date
Publication date
Application filed by Sandvik AB filed Critical Sandvik AB
Priority to AT89850432T priority Critical patent/ATE91725T1/de
Publication of EP0374116A1 publication Critical patent/EP0374116A1/de
Application granted granted Critical
Publication of EP0374116B1 publication Critical patent/EP0374116B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • 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
    • B21B27/035—Rolls for bars, rods, rounds, tubes, wire or the like
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron

Definitions

  • the present invention relates to casting one or several rings of cemented carbide into cast alloys based on iron, preferably cast iron.
  • the resulting product is a composite roll ring, made in one piece only, with metallurgical bond between cemented carbide and cast iron.
  • Possible driving devices for transmitting of torque are located in the cast iron part.
  • Cemented carbide belongs to the group brittle materials and has limited tensile strength with special notch sensitivity in inner corners, such as in keyway bottoms or other driving grooves, or at roots of driving lugs, made integral with the carbide ring. Methods based on such conventional joints have worked unsatisfactorily.
  • Another method for the torque trans­mission is by means of frictional forces at the bore surface of the carbide ring. However, the radial force on this surface gives rise to tangential tensile stresses in the carbide ring with a maximum at its inner diameter. These tensile stresses are superimposed on other tensile stresses, generated when the roll is in use.
  • casing materials either characterised by low hardness and low yield strength or cemented carbide, being a brittle material, are used; neither particularly suitable in the necessary torque transmission couplings.
  • any grade of cemented carbide can be used in roll rings according to the invention.
  • the difference in linear thermal expansion of ductile iron and cemented carbide, the latter having the lower expansion increases with reduced binding phase content in the cemented carbide.
  • cemented carbide grades with 15 or more percent by weight of binder phase, comprising cobalt, nickel and chromium in various combinations and amounts have proved to be successful and are also used in com­posite roll rings according to the invention.
  • a composite roll ring is now in hand, where the detrimental tensile stresses have been eliminated or substantially reduced.
  • the composition of the cast iron is also chosen with regard to optimal metallurgical bond to the carbide, to its strength, toughness and hardness, all necessary for the trans­mission of the torque, and to its machinability.
  • ferro-silicium-magnesium and/or nickel-magnesium gets a magnesium content of 0,02 -0,10, preferably 0,04-0,07 percent by weight.
  • the cast alloy gets a silicon content of 1,9-2,8, preferably 2,1-2,5 percent by weight.
  • a ductile iron is obtained having dispersed spheroidal graphite.
  • This ductile iron has a hardness-toughness-­strength which is well balanced to the application. In heat treated condition the Brinell hardness is 250-350.
  • the iron has been alloyed with austenite generating alloying elements such as nickel, molybdenum, manganese, and chromium, usually nickel in amounts of 3-10, preferably 4-8 percent by weight, and molybdenum in amounts of up to 3, preferably 0,1-1,5 percent by weight, resulting in a certain amount of residual austenite viz. 5-30, preferably 10-25 or rather 15-20 percent by weight after the casting.
  • austenite generating alloying elements such as nickel, molybdenum, manganese, and chromium, usually nickel in amounts of 3-10, preferably 4-8 percent by weight, and molybdenum in amounts of up to 3, preferably 0,1-1,5 percent by weight, resulting in a certain amount of residual austenite viz. 5-30, preferably 10-25 or rather 15-20 percent by weight after the casting.
  • a suitable amount of residual austenite can under volume increase be transformed to bainite.
  • This volume increase can be so adjusted that the differen­tial shrinkage, taking place in the composite roll ring during cooling from the casting temperature, can be totally or partly eliminated.
  • the method for this heat treatment is adjusted accord­ing to carbide grade, composition of the iron, and roll applica­tion.
  • the heat treatment includes heating to and holding at a temperature of 800-1000°C, cooling to and holding at a temperature of 400-550°C and cooling to room temperature.
  • the first mentioned temperature interval 800-1000°C results in increased toughness.
  • the heat treatment can be made by heating to and holding at 500-650°C and cooling to room temperature.
  • the method of casting a carbide ring into cast iron follows mainly common casting technique.
  • the demands on flawless metallur­gical bond between cemented carbide and cast iron and on the required special properties of the cast iron call for accurate control of the casting technique, among others including the following clauses: - Extreme over-temperature of the iron in the cradle.
  • Ignition of exothermal material kept in an ample space over the roll ring space in order to keep a certain extra amount of iron in molten state for after-filling of the roll ring space.
  • the ductile iron and the bond between the cemented carbide and the ductile iron in the cast composite roll ring are checked by ultra­sonic methods.
  • the present composite roll ring generally receives the torque via conventional key joints, splines, clutches or similar known torque transmitting joints, located in the considerably less notch sensi­tive iron part of the composite roll ring, from which the torque is carried over to the carbide ring via the metallurgical bond between the cemented carbide and the cast iron. Still, there are rolling mills that only allow of friction drive in the roll ring bore.
  • the separating force is counteracted by radial force only from the spindle against the bore of the carbide roll ring.
  • the carbide has a Young's modulus of 2-3 times that of steel or cast iron, the separating force will elastically deform the material supporting the carbide roll ring in the bore, result­ing in elastic deformation of the carbide ring and consequently in tangential tensile stresses in the carbide ring with maximum at the bore.
  • the cast iron on both sides of the carbide ring will carry a part of the separating force, correspondingly reducing the tensile stresses.
  • the radial wall thickness of the carbide ring in composite roll rings according to the invention can be reduced due to the just discussed restrictions of the tensile stresses from the separating force. Furthermore, the torque transmission by conventional key joints or similar does not add to the tangential tensile stresses. Also when driving by friction in the bore of composite roll rings, or when mounting with press fit between the composite roll ring and the spindle, the resulting tensile stress in the carbide ring is limited in relation to that of roll rings of solid carbide.
  • the carbide rings in composite roll rings according to the invention can be made more narrow by locating the driving devices in the cast iron part.
  • the composite roll ring according to the invention is characterised by a carbide ring having smaller dimensions than roll rings of solid carbide, resulting in lower costs. Furthermore, the carbide ring has to be machined on the outer surface only, often by turning and then perferably of carbide grades containing 20 or more percent by weight of binder phase, and the machining of the bore, faces and driving devices is made in cast iron, being more easily machined than carbide, also resulting in lower costs.
  • the grooves necessary for torque transmission can be made in the bore or on the faces of the composite roll ring.
  • One or several composite roll rings can be mounted on a roll body with journals in both ends, and which has parts fitting in the grooves of the composite roll ring, thereby transmitting the torque from the spindle either directly or via an intermediate sleeve.
  • Figure 1 shows a roll design where the torque is transmitted from the spindle 1 via keys 2, fastened in the middle part 3 of the spindle and fitting in the keyways 4 of the composite roll ring, to the ductile iron part 5 of the composite roll ring and via the metallurgical bond A to the carbide ring 6.
  • the roll rings are fixed via the sleeve 7 by the nut 8 with a locking screw 9.
  • Figure 2 shows a roll design where the torque is transmitted from the spindle 1 via the key 2 to the sleeve 3, whose driving lugs 4 fitting in the grooves 5 transmit the torque to the ductile iron part 6 of the composite roll ring and via the metallurgical bond A further to the carbide ring 7.
  • the relative axial position of the roll rings is determined by the sleeve 3 and is fixed via the sleeve 8 by the nut 9 with a locking screw 10.
  • Figure 3 shows a roll design where the torque is transmitted from the spindle 1 via the key 2 in the keyway 3 to the ductile iron part 4 of the composite roll ring and via the metallurgical bond A further to the carbide ring 5.
  • the roll rings are fixed via the sleeve 6 by the nut 7 with the locking screw 8.
  • Figure 4 shows a composite roll ring mounted on a free spindle end i.e. the roll spindle has no bearing on one side of the roll ring.
  • the torque is transmitted by friction in the bore of the roll ring, generated by the tapered sleeve 2 driven up the taper part of the spindle 1, to the ductile iron part 3 of the composite roll ring and via the metallurgical bond A to the carbide ring 4.
  • Composite roll rings with carbide rings cast into ductile iron have been tested in finishing and intermediate rod mills, mounted on roll bodies with journals in both ends as well as on free spindle ends. They have also been tested as rolls for rolling reinforcement bars and tubes and as pinch rollers. Their performance has been in good agreement with the experience of carbide hot rolls gained since 1965.
  • Carbide rings with diameters up to 500 mm make possible utilization in cold rolling mills and in other roll applications.
  • a sintered cmented carbide ring with 70 % WC in a binder phase consisting of 13 % Co, 15 % Ni and 2 % Cr was blasted to clean its surface from any adhering materials.
  • the outer diameter of the ring was 340 mm, the inner diameter 270 mm and its width 85 mm.
  • a ring of sand was formed around the carbide ring and it was then placed in a bottom flask of a mould with suitable shape and dimensions and provided with the necessary channels and an overflow box for the molten iron.
  • a ring of an exothermic material was placed in the top flask of the mould and the two flasks were put together and firmly locked.
  • Molten iron with a temperature of 1550°C and with a composition in weight percent of 3,7 C, 2,3 Si, 0,3 Mn, 5,4 Ni, 0,2 Mo, 0,05 Mg, and balance Fe was poured into the mould.
  • inoculants of ferro-silicium-magnesium was added, included in the aforementioned analysis.
  • the molten iron was poured into the mould in such an amount and at such a flow rate, that a suitable melting of the cemented carbide surface was obtained.
  • the iron had risen to the exothermic material it started to burn adding heat to the iron.
  • the mould cooled slowly to room temperature after which the roll was removed from the mould, excessive iron cut off and the roll cleaned. The quality of the bond and the absence of flaws in the iron was checed by ultrasonic methods.
  • the roll was then heat treated to transform retained austenite to bainite by heating to 900°C and keeping at that temperature for six hours then lowering the temperature to 450°C and keeping there for four hours before cooling to room temperature. Finally, the roll was machined by turning to final shape and dimension viz. inner diameter of the bore 255 mm and width 120 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geometry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rolling Contact Bearings (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Glass Compositions (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
EP89850432A 1988-12-13 1989-12-12 Walzring aus Hartmetall und Gusseisen und Verfahren zur Herstellung Expired - Lifetime EP0374116B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89850432T ATE91725T1 (de) 1988-12-13 1989-12-12 Walzring aus hartmetall und gusseisen und verfahren zur herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8804503 1988-12-13
SE8804503A SE464226B (sv) 1988-12-13 1988-12-13 Valsring, sammansatt av haardmetall och gjutjaern samt saett foer framstaellning av densamma

Publications (2)

Publication Number Publication Date
EP0374116A1 true EP0374116A1 (de) 1990-06-20
EP0374116B1 EP0374116B1 (de) 1993-07-21

Family

ID=20374218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89850432A Expired - Lifetime EP0374116B1 (de) 1988-12-13 1989-12-12 Walzring aus Hartmetall und Gusseisen und Verfahren zur Herstellung

Country Status (12)

Country Link
EP (1) EP0374116B1 (de)
JP (1) JPH0699776B2 (de)
KR (1) KR960007504B1 (de)
AT (1) ATE91725T1 (de)
AU (1) AU615125B2 (de)
BR (1) BR8906357A (de)
CA (1) CA2005220C (de)
DD (1) DD296011A5 (de)
DE (1) DE68907702T2 (de)
ES (1) ES2042071T3 (de)
SE (1) SE464226B (de)
ZA (1) ZA899448B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753594A1 (de) * 1995-07-14 1997-01-15 Sandvik Aktiebolag Verbundwalze
CN1050074C (zh) * 1994-11-17 2000-03-08 宝山钢铁(集团)公司 合金球铁连轧组合辊
EP2508262A1 (de) 2011-04-04 2012-10-10 Cellwood Machinery AB Verfahren zur Bereitstellung eines Kraftstoffs
EP2508670A1 (de) 2011-04-04 2012-10-10 Cellwood Machinery AB Refinerscheibe oder Refinerscheibensegment
US10337089B2 (en) 2014-07-25 2019-07-02 Ford Global Technologies, Llc Process for producing a component made of heat-treated cast iron
US10730104B2 (en) 2011-04-06 2020-08-04 Esco Group Llc Hardfaced wear part using brazing and associated method and assembly for manufacturing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU657296B2 (en) * 1991-02-11 1995-03-09 Sandvik Ab A roll including a cemented carbide ring cast into a cast iron body
GB9409322D0 (en) * 1994-05-10 1994-06-29 Keg Services Ltd Container
CN1067443C (zh) * 1998-10-15 2001-06-20 冶金工业部北京冶金设备研究院 多元钨合金铸铁辊环及其制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549430A (en) * 1967-11-14 1970-12-22 Int Nickel Co Bainitic ductile iron having high strength and toughness
US3609849A (en) * 1969-04-09 1971-10-05 Jan M Krol Forming rolls
US3860457A (en) * 1972-07-12 1975-01-14 Kymin Oy Kymmene Ab A ductile iron and method of making it
DE2200285B2 (de) * 1971-01-08 1979-10-11 Seco Tools Ab, Fagersta (Schweden) Verbundwalze für das Warmwalzen und/oder Kaltwalzen von Metallen
DE2704702C2 (de) * 1976-02-05 1988-09-22 Sandvik Ab, Sandviken, Se

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5767145A (en) * 1980-10-09 1982-04-23 Toshiba Tungaloy Co Ltd Superhard alloy for plastic working
JPS61176408A (ja) * 1985-01-31 1986-08-08 Kubota Ltd 複合リングロ−ル
JPH0627289B2 (ja) * 1985-02-28 1994-04-13 株式会社クボタ ネツク部の強籾な複合ロ−ルの製造方法
SE8502514L (sv) * 1985-05-22 1986-11-23 Volvo Ab Forfarande for framstellning av ett bainitherdat segjern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3549430A (en) * 1967-11-14 1970-12-22 Int Nickel Co Bainitic ductile iron having high strength and toughness
US3609849A (en) * 1969-04-09 1971-10-05 Jan M Krol Forming rolls
DE2200285B2 (de) * 1971-01-08 1979-10-11 Seco Tools Ab, Fagersta (Schweden) Verbundwalze für das Warmwalzen und/oder Kaltwalzen von Metallen
US3860457A (en) * 1972-07-12 1975-01-14 Kymin Oy Kymmene Ab A ductile iron and method of making it
DE2704702C2 (de) * 1976-02-05 1988-09-22 Sandvik Ab, Sandviken, Se

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1050074C (zh) * 1994-11-17 2000-03-08 宝山钢铁(集团)公司 合金球铁连轧组合辊
EP0753594A1 (de) * 1995-07-14 1997-01-15 Sandvik Aktiebolag Verbundwalze
CN1068634C (zh) * 1995-07-14 2001-07-18 桑德维克公司 复合辊
EP2508262A1 (de) 2011-04-04 2012-10-10 Cellwood Machinery AB Verfahren zur Bereitstellung eines Kraftstoffs
EP2508670A1 (de) 2011-04-04 2012-10-10 Cellwood Machinery AB Refinerscheibe oder Refinerscheibensegment
WO2012136704A1 (en) 2011-04-04 2012-10-11 Cellwood Machinery Ab Refining disc or refining disc segment
US10730104B2 (en) 2011-04-06 2020-08-04 Esco Group Llc Hardfaced wear part using brazing and associated method and assembly for manufacturing
US10337089B2 (en) 2014-07-25 2019-07-02 Ford Global Technologies, Llc Process for producing a component made of heat-treated cast iron

Also Published As

Publication number Publication date
DE68907702T2 (de) 1993-10-28
AU615125B2 (en) 1991-09-19
SE464226B (sv) 1991-03-25
BR8906357A (pt) 1990-08-21
DD296011A5 (de) 1991-11-21
SE8804503D0 (sv) 1988-12-13
SE8804503L (sv) 1990-06-14
KR900010021A (ko) 1990-07-06
KR960007504B1 (ko) 1996-06-05
ZA899448B (en) 1990-09-26
ATE91725T1 (de) 1993-08-15
CA2005220A1 (en) 1990-06-13
JPH02243736A (ja) 1990-09-27
DE68907702D1 (de) 1993-08-26
ES2042071T3 (es) 1993-12-01
CA2005220C (en) 2000-03-14
EP0374116B1 (de) 1993-07-21
JPH0699776B2 (ja) 1994-12-07
AU4585089A (en) 1990-06-21

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