EP0571465A1 - Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture - Google Patents

Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture

Info

Publication number
EP0571465A1
EP0571465A1 EP92904709A EP92904709A EP0571465A1 EP 0571465 A1 EP0571465 A1 EP 0571465A1 EP 92904709 A EP92904709 A EP 92904709A EP 92904709 A EP92904709 A EP 92904709A EP 0571465 A1 EP0571465 A1 EP 0571465A1
Authority
EP
European Patent Office
Prior art keywords
cast
roll
cemented carbide
casting
cast iron
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Withdrawn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
EP92904709A
Other languages
German (de)
French (fr)
Inventor
Jan-Erik Carlsson
Gert Sundstedt
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
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 Sandvik AB filed Critical Sandvik AB
Publication of EP0571465A1 publication Critical patent/EP0571465A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • 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
    • 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

Definitions

  • the present invention relates to casting by the centrifugal casting method one or several cemented carbide rings into cast alloys based on iron, prefer ⁇ ably cast iron.
  • the resulting product is a composite roll, made in one piece only, with metallurgical bond between cemented carbide and cast iron.
  • Composite rolls with cemented carbide for hot or cold rolling comprise one or several cemented carbide rings attached to a (driving) spindle by various couplings and locking devices.
  • One method of trans- mitting the torque from the driving spindle to the cemented carbide roll is to use keyways or other driving grooves or driving lugs, made integral with the cemented carbide ring.
  • cemented carbide is a brittle material with limited tensile strength and special notch sensitivity such as in inner cor ⁇ ners in above mentioned devices for the torque trans ⁇ mission. 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 cemented carbide ring.
  • the method according to the mentioned patent applica- tion permits manufacture of merely roll rings, which then by couplings and locking devices on a driving spindle are assembled to a complete roll. Even if the necessary couplings for the torque transmission are made in the cast iron part there are dimensional limitations and thereby a limit for the transmittable torque. Further, the wear resistant surface (the barrel) of the rolls is di ensionally restricted. According to the mentioned method or other existing systems of cemented carbide rolls, operating by way of some kind of torque transmitting couplings, one is not totally free to place cemented carbide rings on the barrel because of space requiring couplings and locking devices. Thereby, the surface to be used for rolling becomes substantially restricted.
  • Centrifugal casting is a well known technique for manufacture of usually rotary symmetric bodies.
  • the technique utilizes the centrifugal force, accomp ⁇ lished by a rotating cylindrical mould, to sling the molten metal against the walls of the mould, where it solidifies under pressure to desired shape.
  • the technique is commonly used for manufacture of tubes, linings, bushes etc., but is also used for manufac ⁇ ture or rolls.
  • a composite roll for hot or cold rolling mills having a centrifugal cast outer wear resistant layer or casing of a high alloyed cast steel and a core of a vermicular cast iron, ductile iron or simple cast steel.
  • a composite roll is now provided made in one piece only by means of centri ⁇ fugal casting with metallurgical bond between cemen ⁇ ted carbide and cast iron, where the barrel may be equipped with one or several cemented carbide rings according to actual rolling conditions and require ⁇ ments. This freedom in design is possible to achieve only by the present invention.
  • Figure 1, 2 and 3 show some alternative embodiments.
  • Figure 1 shows a roll of ductile iron (1) in which a cemented carbide ring (2) is cast in.
  • Figure 2 shows a roll of ductile iron (1) in which four cemented carbide rings (2) are cast in.
  • Figure 3 shows a roll with four cemented carbide rings (2) cast in ductile iron (1) and with core and journals in another material (3) .
  • the moulding of the cemented carbide ring or rings in the foundry sand must be made in such a way that the molten cast iron is prevented from reaching the outer surface of the cemented carbide ring. This is proven to be possible by the invention.
  • the outer surface of the cemented carbide ring forms the barrel of the manufactured composite roll.
  • such surface penetrations must be avoided which, according to above, is possi ⁇ ble.
  • the present composite roll comprises, after necessary heat treatment and machining to final shape and dimension, a complete roll or roll ring.
  • the cemented carbide is cast into an essentially graphitic cast iron with a composition adjusted to the carbon equivalent, Ceqv. , in a way described in the Swedish patent No. 8601289- 7, publication number 399911.
  • the composition of the cast iron is also chosen with regard to optimum metallurgical bond to the cemented carbide, to its strength, toughness and hardness, all necessary for the transmission of the torque and to its machin- ability.
  • ferro-silicium-magnesium and/or nickel-magnesium gets a magne ⁇ sium content of 0,02-0,10, preferably 0,04-0,07 percent by weight.
  • the cast iron 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.
  • the Brinell hardness is 250-300.
  • the iron shall be alloyed with austenite generating alloying elements, preferably nickel in amount of 3-10, preferably 4-8 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 other structure elements for example bainite.
  • This volume increase can be so adjusted that the differential shrinkage, taking place in the composite roll during cooling from the casting tem ⁇ perature, can be totally or partly eliminated.
  • the method for this heat treatment is adjusted to cemen ⁇ ted carbide grade, composition of the cast iron and to 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 roll comprises a cemented carbide ring (or rings) and a casing of mentioned cast iron only, whereas roll core and journals are cast of another casting alloy either by centrifugal or static casting.
  • the roll comprises a cemented carbide ring (or rings) cast into a ring- shaped casing only.
  • a method for manufacture of a complete cemented carbide equipped roll for hot or cold rolling According to the method at least one sintered cemented carbide ring is placed in a mould in a centrifugal casting equipment with the bore surface of the ring and its side surfaces free to establish contact between cemented carbide and cast iron.
  • the mould is rotated and when proper speed is achieved a molten cast iron with above described composition and suitable tempe ⁇ rature is tapped down into the rotating mould, in doing which the molten iron is slung against the wall of the mould and solidifies under pressure. After cooling to room temperature the roll is cleaned and is then heat treated according to above.
  • a cemented carbide ring (or rings) is cast into a casing of mentioned cast iron only, after which core and journals are cast of another cast alloy either by centrifugal or static casting.
  • a cemented carbide ring (or rings) is cast into a ring-shaped casing only, by centrifugal casting.
  • the dimensions of the cemented carbide ring were:
  • the mould was put to rotate at 400 revolutions per minute.
  • a cast iron melt with the composition 3,7 % carbon (C) , 2,3 % silicon (Si), 0,3 % manganese (Mn) , 5,4 % nickel (Ni) , 0,2 % molybdenum (Mo), 0,05 % magnesium (Mg) and the balance iron (Fe) , all percent by weight, at a temperature of 1540 °C was tapped into the rotating mould.
  • the duration of pouring was about l minute. During that time the rotation gra ⁇ dually ceased.
  • the composite roll was cleaned and checked by an ultrasonic method. The quality of the metallurgical bond was good.
  • the roll was heat treated, with the aim of trans- forming the residual austenite to bainite, by heating to 900 °C, holding time 6 hours, then cooling to 450 °C, holding time 4 hours, followed by cooling to rcom temperature.
  • the freely exposed surfaces of the cemented carbide ring were covered with an anti- oxidizing agent, as the heat treatment was performed in open air.
  • the roll dimensions were:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Heat Treatment Of Articles (AREA)
  • Tires In General (AREA)

Abstract

Un cylindre (1) en fonte et carbure cémenté, qui peut être utilisé pour le laminage à chaud ou à froid, présente un corps doté d'un ou de plusieurs anneaux de carbure cémenté (2), coulés par la technique de la coulée centrifuge dans un corps de cylindre réalisé en un alliage de fer. Ledit alliage comprend essentiellement de la fonte à graphite qui, une fois coulée contient de l'austénite résiduelle. Dans une phase ou des phases ultérieure(s) de traitement thermique, cette austénite est transformée totalement ou partiellement en bainite avec augmentation du volume, afin de réduire ou d'éliminer totalement le retrait différentiel entre la fonte et le carbure cémenté lors du refroidissement après la coulée. La partie centrale du cylindre (3) peut être réalisée en un autre alliage.A cylinder (1) of cast iron and cemented carbide, which can be used for hot or cold rolling, has a body provided with one or more rings of cemented carbide (2), cast by the technique of centrifugal casting. in a cylinder body made of an iron alloy. Said alloy essentially comprises graphite cast iron which, once cast, contains residual austenite. In a subsequent phase or phases of heat treatment, this austenite is completely or partially transformed into bainite with increase in volume, in order to reduce or totally eliminate the differential shrinkage between the cast iron and the cemented carbide during cooling after casting. The central part of the cylinder (3) can be made of another alloy.

Description

ROLL CAST IN ONE PIECE, COMPRISING CEMENTED CARBIDE AND CAST IRON, AND METHOD FOR ITS MANUFACTURE
The present invention relates to casting by the centrifugal casting method one or several cemented carbide rings into cast alloys based on iron, prefer¬ ably cast iron. The resulting product is a composite roll, made in one piece only, with metallurgical bond between cemented carbide and cast iron.
Composite rolls with cemented carbide for hot or cold rolling comprise one or several cemented carbide rings attached to a (driving) spindle by various couplings and locking devices. One method of trans- mitting the torque from the driving spindle to the cemented carbide roll is to use keyways or other driving grooves or driving lugs, made integral with the cemented carbide ring. However, cemented carbide is a brittle material with limited tensile strength and special notch sensitivity such as in inner cor¬ ners in above mentioned devices for the torque trans¬ mission. 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 cemented carbide ring.
However, the radial force on this surface gives rise to tangential tensile stresses in the cemented carbide ring with a maximum at its inner diameter. These tensile stresses are added to other tensile stresses, generated when the roll is in use.
By casting a casing of an iron alloy onto a cemented carbide ring a composite roll for hot or cold rolling is obtained, in which required devices for torque transmission may be located to the cast iron, see for example the Swedish patent No. 7100170-5, publication number 371114. However, this is not an entirely simple problem. Due to the fact that during cooling the casing shrinks more than the cemented carbide ring, inwardly directed forces on the cemented carbide ring are produced, giving rise to axially directed tensile stresses on the outer surface of the cemented carbide ring, which are acting perpendi¬ cularly to micro cracks generated in the roll surface during rolling. Under the influence of these tensile stresses the micro cracks propagate in depth, which may cause roll breakage or need for excessive dress¬ ing amount, limiting the total rolling capacity of the roll.
A solution to this problem is described in the
Swedish patent application No. 8804503-4, according to which one or several cemented carbide rings are cast into a casing of an iron alloy, at which the cast alloy comprises an essentially graphitic cast iron, which after the casting contains the structure element residual austenite, preferably 15-20 percent by weight, which at subsequent one or several heat treatment steps totally or partly is transformed under volume increase to mainly bainite, with the aim of reducing or totally eliminating the differential shrinkage between the cast iron and the cemented carbide as a result from cooling after the casting.
The method according to the mentioned patent applica- tion permits manufacture of merely roll rings, which then by couplings and locking devices on a driving spindle are assembled to a complete roll. Even if the necessary couplings for the torque transmission are made in the cast iron part there are dimensional limitations and thereby a limit for the transmittable torque. Further, the wear resistant surface (the barrel) of the rolls is di ensionally restricted. According to the mentioned method or other existing systems of cemented carbide rolls, operating by way of some kind of torque transmitting couplings, one is not totally free to place cemented carbide rings on the barrel because of space requiring couplings and locking devices. Thereby, the surface to be used for rolling becomes substantially restricted.
Centrifugal casting is a well known technique for manufacture of usually rotary symmetric bodies. The technique utilizes the centrifugal force, accomp¬ lished by a rotating cylindrical mould, to sling the molten metal against the walls of the mould, where it solidifies under pressure to desired shape. The technique is commonly used for manufacture of tubes, linings, bushes etc., but is also used for manufac¬ ture or rolls. For example, by the Swedish patent application No. 8603987-2 a composite roll for hot or cold rolling mills is known, having a centrifugal cast outer wear resistant layer or casing of a high alloyed cast steel and a core of a vermicular cast iron, ductile iron or simple cast steel.
According to the invention a composite roll is now provided made in one piece only by means of centri¬ fugal casting with metallurgical bond between cemen¬ ted carbide and cast iron, where the barrel may be equipped with one or several cemented carbide rings according to actual rolling conditions and require¬ ments. This freedom in design is possible to achieve only by the present invention.
Figure 1, 2 and 3 show some alternative embodiments. Figure 1 shows a roll of ductile iron (1) in which a cemented carbide ring (2) is cast in.
Figure 2 shows a roll of ductile iron (1) in which four cemented carbide rings (2) are cast in.
Figure 3 shows a roll with four cemented carbide rings (2) cast in ductile iron (1) and with core and journals in another material (3) .
The moulding of the cemented carbide ring or rings in the foundry sand must be made in such a way that the molten cast iron is prevented from reaching the outer surface of the cemented carbide ring. This is proven to be possible by the invention.
The outer surface of the cemented carbide ring (or rings) forms the barrel of the manufactured composite roll. Experience from previous manufacture of cast-in roll rings, according to the patent application No. 8804503-4, shows that a small amount of molten cast iron, having penetrated the outer surface of the cemented carbide ring, results in deteriorated sur¬ face quality of the cemented carbide under the pene- tration surface. By machining one or a few milli¬ meters of the outer surface of the cemented carbide ring this surface deterioration can be removed. For successful manufacture of a composite roll according to the present invention such surface penetrations must be avoided which, according to above, is possi¬ ble.
In order to achieve optimum metallurgical bond bet¬ ween cemented carbide and cast iron it is necessary to use high over-temperature of the iron in the cradle, combined with amount controlled filling of the mould and a predetermined speed of rotation, to get a balanced heating and melting of a surface layer of the part of the cemented carbide ring which is not moulded in the foundry sand, i.e. the part that shall be metallurgically bonded to the cast iron.
The present composite roll comprises, after necessary heat treatment and machining to final shape and dimension, a complete roll or roll ring. The diffi- culties with existing cemented carbide rolls to con¬ fidently transmit the torque from the driving spindle to the cemented carbide part, as previously de¬ scribed, has been eliminated with this composite roll.
According to the invention the cemented carbide is cast into an essentially graphitic cast iron with a composition adjusted to the carbon equivalent, Ceqv. , in a way described in the Swedish patent No. 8601289- 7, publication number 399911. The composition of the cast iron is also chosen with regard to optimum metallurgical bond to the cemented carbide, to its strength, toughness and hardness, all necessary for the transmission of the torque and to its machin- ability. By addition of ferro-silicium-magnesium and/or nickel-magnesium the cast alloy gets a magne¬ sium content of 0,02-0,10, preferably 0,04-0,07 percent by weight. By inoculation with ferro-silicium the cast iron gets a silicon content of 1,9-2,8, preferably 2,1-2,5 percent by weight. Thereby 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 250-300. Further, the iron shall be alloyed with austenite generating alloying elements, preferably nickel in amount of 3-10, preferably 4-8 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. By heat treat- ment in one or several steps a suitable amount of residual austenite can under volume increase be transformed to other structure elements for example bainite. This volume increase can be so adjusted that the differential shrinkage, taking place in the composite roll during cooling from the casting tem¬ perature, can be totally or partly eliminated. The method for this heat treatment is adjusted to cemen¬ ted carbide grade, composition of the cast iron and to 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.
In an alternative embodiment the roll comprises a cemented carbide ring (or rings) and a casing of mentioned cast iron only, whereas roll core and journals are cast of another casting alloy either by centrifugal or static casting.
In another alternative embodiment the roll comprises a cemented carbide ring (or rings) cast into a ring- shaped casing only.
According to the invention there is also provided a method for manufacture of a complete cemented carbide equipped roll for hot or cold rolling. According to the method at least one sintered cemented carbide ring is placed in a mould in a centrifugal casting equipment with the bore surface of the ring and its side surfaces free to establish contact between cemented carbide and cast iron. The mould is rotated and when proper speed is achieved a molten cast iron with above described composition and suitable tempe¬ rature is tapped down into the rotating mould, in doing which the molten iron is slung against the wall of the mould and solidifies under pressure. After cooling to room temperature the roll is cleaned and is then heat treated according to above.
According to an alternative method a cemented carbide ring (or rings) is cast into a casing of mentioned cast iron only, after which core and journals are cast of another cast alloy either by centrifugal or static casting.
According to another alternativ embodiment a cemented carbide ring (or rings) is cast into a ring-shaped casing only, by centrifugal casting.
Example
A sintered cemented carbide ring with the composition 70 % tungsten carbide (WC) , 13 % cobalt (Co) , 15 % nickel (Ni) , 2 % chromium (Cr) , all percent by weight, was molded in foundry sand in a mould in a vertical centrifugal casting machine. The dimensions of the cemented carbide ring were:
- Outer diameter 340 mm
- Inner diameter 260 mm
- Width 100 mm.
After the molding the bore surface of the cemented carbide ring and its side surfaces between the inner diameter and a diameter of 310 mm were free in order to there create a metallurgical bond between the cemented carbide and the cast iron.
The mould was put to rotate at 400 revolutions per minute. A cast iron melt, with the composition 3,7 % carbon (C) , 2,3 % silicon (Si), 0,3 % manganese (Mn) , 5,4 % nickel (Ni) , 0,2 % molybdenum (Mo), 0,05 % magnesium (Mg) and the balance iron (Fe) , all percent by weight, at a temperature of 1540 °C was tapped into the rotating mould. The duration of pouring was about l minute. During that time the rotation gra¬ dually ceased.
After the cooling the composite roll was cleaned and checked by an ultrasonic method. The quality of the metallurgical bond was good.
The roll was heat treated, with the aim of trans- forming the residual austenite to bainite, by heating to 900 °C, holding time 6 hours, then cooling to 450 °C, holding time 4 hours, followed by cooling to rcom temperature. The freely exposed surfaces of the cemented carbide ring were covered with an anti- oxidizing agent, as the heat treatment was performed in open air. The roll dimensions were:
Barrel: 0310 mm (cemented carbide 0340 mm) x 500 mm. Journals: 0220 x 300 mm + 220 x 520 mm.

Claims

Claims
1. Roll, preferably for hot or cold rolling, by which the barrel comprises of one or several cemented carbide rings cast into a casting alloy comprising an essentially graphitic cast iron, which after the casting contains 5-30, preferably 15-20 percent by weight residual austenite, which at subsequent one or several heat treatment steps totally or partly is transformed under volume increase to mainly bainite, with the aim of re¬ ducing or totally eliminating the differential shrinkage between the cast iron and the cemented carbide as a result from cooling after the cas- ting, c h a r a c t e r i z e d of the roll in¬ cluding journals is cast in one piece, which is later machined to final shape and dimension.
2. The roll of claim 1 c h a r a c t e r i z e d in that the roll is made by centrifugal casting.
3. The roll of claim 2 c h a r a c t e r i z e d in that it comprises a casing of said cast iron, holding one or several carbide rings, and a core and journals cast of another cast alloy by cen¬ trifugal or static casting.
4. The roll of claim 2 c h a r a c t e r i z e d in that the roll comprises a cemented carbide ring (or rings) cast into a ring-shaped casing only.
5. Method of manufacturing a roll, preferably for hot or cold rolling, in which the barrel com- prises one or several cemented carbide rings cast into a casting alloy, comprising an essentially graphitic cast iron, which after the casting contains 5-30, preferably 15-20 percent by weight residual austenite, which at subsequent one or several heat treatment steps totally or partly is transformed under volume increase to mainly bai¬ nite, with the aim of reducing or totally elimi¬ nating the differential shrinkage between the cast iron and the cemented carbide as a result from cooling after the casting, c h a r a c t e - r i z e d of the roll including journals is cast in one piece, which is later machined to final shape and dimension.
6. Method of claim 5 c h a r a c t e r i z e d in that the casting is made by centrifugal casting technique.
7. Method of claim 6 c h a r a c t e r i z e d in that by centrifugal casting the cemented carbide ring (or rings) is cast into a casing of said casting alloy, after which roll core and journals are cast of another casting alloy either by cen¬ trifugal or static casting.
8. Method of claim 6 c h a r a c t e r i z e d in that a ring-shaped casing only is cast.
EP92904709A 1991-02-11 1992-02-07 Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture Withdrawn EP0571465A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9100405 1991-02-11
SE9100405A SE9100405D0 (en) 1991-02-11 1991-02-11 ROLLING, COMPOSITION OF HEAVY METAL AND CASTING IRON, AND SUITABLE FOR PREPARATION OF THE SAME

Publications (1)

Publication Number Publication Date
EP0571465A1 true EP0571465A1 (en) 1993-12-01

Family

ID=20381865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92904709A Withdrawn EP0571465A1 (en) 1991-02-11 1992-02-07 Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture

Country Status (17)

Country Link
EP (1) EP0571465A1 (en)
JP (1) JPH04319059A (en)
KR (1) KR920016174A (en)
CN (1) CN1032628C (en)
BR (1) BR9200461A (en)
CA (1) CA2060768A1 (en)
CZ (1) CZ164393A3 (en)
FI (1) FI933532A (en)
HU (1) HU216115B (en)
IL (1) IL100901A (en)
MX (1) MX9200574A (en)
NZ (1) NZ241549A (en)
RU (1) RU2060067C1 (en)
SE (1) SE9100405D0 (en)
TN (1) TNSN92011A1 (en)
WO (1) WO1992013651A1 (en)
ZA (1) ZA92832B (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19827861A1 (en) * 1997-06-27 1999-01-07 Mitsubishi Materials Corp Thermal shock resistant composite roll
SE533591C2 (en) * 2009-03-12 2010-11-02 Sandvik Intellectual Property Roller comprising a drive shaft and a roller ring
CN102069152B (en) * 2010-12-22 2012-10-03 宁夏共享集团有限责任公司 Modeling method of large-size ring-structure casting
EP2508670B1 (en) 2011-04-04 2013-08-21 Cellwood Machinery AB Refining disc or refining disc segment
EP2508262B1 (en) 2011-04-04 2014-01-01 Cellwood Machinery AB Method of provision of a fuel
JOP20200150A1 (en) 2011-04-06 2017-06-16 Esco Group Llc Hardfaced wearpart using brazing and associated method and assembly for manufacturing
WO2013077377A1 (en) * 2011-11-21 2013-05-30 日立金属株式会社 Centrifugally cast composite rolling mill roll and manufacturing method therefor
CN103009015B (en) * 2013-01-13 2015-01-07 邯郸市永固冶金备件有限公司 Method for manufacturing double metal composite wear-resistant metallurgical rollers
CN103978177B (en) * 2014-05-22 2016-06-15 江苏双勤民生冶化设备制造有限公司 A kind of roll neck and vertical centrifugal castmethod thereof and application
JP6496933B2 (en) * 2015-04-16 2019-04-10 新日鐵住金株式会社 Material selection method for continuous casting roll and continuous casting roll

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248482A1 (en) * 1982-12-29 1984-07-05 VEB Walzengießerei Coswig im VEB Rohrkombinat, DDR 8270 Coswig Method of manufacturing solid-cast pin rollers according to the horizontal spin-casting principle depending upon the raw cast ball diameter and pin diameter and the casting cycles deriving therefrom

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9213651A1 *

Also Published As

Publication number Publication date
IL100901A0 (en) 1992-11-15
TNSN92011A1 (en) 1993-06-08
WO1992013651A1 (en) 1992-08-20
BR9200461A (en) 1992-10-20
CN1032628C (en) 1996-08-28
FI933532A0 (en) 1993-08-10
MX9200574A (en) 1993-01-01
JPH04319059A (en) 1992-11-10
IL100901A (en) 1994-04-12
KR920016174A (en) 1992-09-24
RU2060067C1 (en) 1996-05-20
FI933532A (en) 1993-08-10
NZ241549A (en) 1994-01-26
HU216115B (en) 1999-04-28
CA2060768A1 (en) 1992-08-12
SE9100405D0 (en) 1991-02-11
ZA92832B (en) 1992-11-25
HU9302321D0 (en) 1993-10-28
HUT65654A (en) 1994-07-28
CN1064827A (en) 1992-09-30
CZ164393A3 (en) 1994-02-16

Similar Documents

Publication Publication Date Title
US5359772A (en) Method for manufacture of a roll ring comprising cemented carbide and cast iron
US3014266A (en) Method for making and repairing rolls
EP0571465A1 (en) Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture
CN113523201A (en) Preparation method of high-wear-resistance nodular cast iron roller for hot continuous rolling and steckel mill
US5044056A (en) Roll ring comprising a ring of cemented carbide metallurgically bonded to a cast iron body
US5167067A (en) Method of making a roll with a composite roll ring of cemented carbide and cast iron
AU714031B2 (en) A composite roll of cemented carbide rings(s) and nodular graphitic iron
US5248289A (en) Cast iron roll with one or more cemented carbide roll rings metallurgically bonded thereto
EP0374116B1 (en) Roll ring, comprising cemented carbide and cast iron, and method for manufacture of the same
AU657296B2 (en) A roll including a cemented carbide ring cast into a cast iron body
US5104458A (en) Method for manufacture of a roll ring comprising cemented carbide and cast iron
CN110629107A (en) Radial spherical plain bearing based on structure enabling material and preparation method
JPH0152110B2 (en)
JPH0340102B2 (en)
JPS6018252B2 (en) Rolling roll with strong neck part
Murty Horizontal Centrifugal Casting
JPS60135558A (en) Material for composite roll with superior seizing resistance
JPS6018248B2 (en) Rolling roll with strong neck part
Jyothi et al. Influence of Centrifugal Force on the Microstructure and Hardness of ZA-8 Alloys
JPH06330228A (en) Production of sleeve roll mode by centrifugal casting
JPH03114628A (en) Cooling mold for drawing-up continuous casting apparatus
JPH08233103A (en) Heat-resisting split pattern elastic ring

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930812

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19950214

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19960111