WO1992013651A1 - 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 Download PDFInfo
- Publication number
- WO1992013651A1 WO1992013651A1 PCT/SE1992/000072 SE9200072W WO9213651A1 WO 1992013651 A1 WO1992013651 A1 WO 1992013651A1 SE 9200072 W SE9200072 W SE 9200072W WO 9213651 A1 WO9213651 A1 WO 9213651A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cast
- roll
- cemented carbide
- casting
- cast iron
- Prior art date
Links
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 24
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 9
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 9
- 238000005097 cold rolling Methods 0.000 claims abstract description 7
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 5
- 230000003068 static effect Effects 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 229910001141 Ductile iron Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 241000237074 Centris Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 241000212342 Sium Species 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- ATTFYOXEMHAYAX-UHFFFAOYSA-N magnesium nickel Chemical compound [Mg].[Ni] ATTFYOXEMHAYAX-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
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
The present invention relates to a roll (1), comprising cemented carbide and cast iron, and method for manufacture of the same. The roll may be used for hot or cold rolling. The barrel comprises one or several cemented carbide rings (2), cast by centrifugal casting method into a roll body of an iron alloy. The casting alloy comprises an essentially graphitic cast iron, which after the casting contains residual austenite. This residual austenite is transformed at subsequent heat treatment step (or steps) totally or partly to mainly bainite under volume increase, 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 central part of the roll (3) body may alternatively consist 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
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.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS931643A CZ164393A3 (en) | 1991-02-11 | 1992-02-07 | Roller, particularly for hot or cold rolling, and process for producing thereof |
| FI933532A FI933532A0 (en) | 1991-02-11 | 1993-08-10 | VALS, SAMMANSATT AV HAORDMETALL OCH GJUTJAERN SAMT SAETT FOER FRAMSTAELLNING AV DENSAMMA |
| NO93932844A NO932844L (en) | 1991-02-11 | 1993-08-10 | ROLLING, COMPREHENSIVE HARD METAL AND CASTLE IRON, AND PROCEDURE FOR THE SAME PRODUCTION |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9100405-1 | 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 |
|---|---|
| WO1992013651A1 true WO1992013651A1 (en) | 1992-08-20 |
Family
ID=20381865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1992/000072 WO1992013651A1 (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) | FI933532A0 (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) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069152A (en) * | 2010-12-22 | 2011-05-25 | 宁夏共享集团有限责任公司 | Modeling method of large-size ring-structure casting |
| US20120028772A1 (en) * | 2009-03-12 | 2012-02-02 | Sandvik Intellectual Property Ab | Roller comprising a drive shaft and a roller ring, as well as a method for assembling such a roller |
| EP2508670A1 (en) | 2011-04-04 | 2012-10-10 | Cellwood Machinery AB | Refining disc or refining disc segment |
| EP2508262A1 (en) | 2011-04-04 | 2012-10-10 | Cellwood Machinery AB | Method of provision of a fuel |
| JP2016203182A (en) * | 2015-04-16 | 2016-12-08 | 新日鐵住金株式会社 | Material selection method of roll for continuous casting, and roll for continuous casting |
| 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19827861A1 (en) * | 1997-06-27 | 1999-01-07 | Mitsubishi Materials Corp | Thermal shock resistant composite roll |
| CN103946408B (en) * | 2011-11-21 | 2016-08-24 | 日立金属株式会社 | Centrifugal casting composite roll and manufacture method thereof |
| 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 |
Citations (1)
| 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 |
-
1991
- 1991-02-11 SE SE9100405A patent/SE9100405D0/en unknown
-
1992
- 1992-02-05 ZA ZA92832A patent/ZA92832B/en unknown
- 1992-02-06 CA CA002060768A patent/CA2060768A1/en not_active Abandoned
- 1992-02-07 HU HUP9302321A patent/HU216115B/en not_active IP Right Cessation
- 1992-02-07 EP EP92904709A patent/EP0571465A1/en not_active Withdrawn
- 1992-02-07 WO PCT/SE1992/000072 patent/WO1992013651A1/en not_active Application Discontinuation
- 1992-02-07 NZ NZ241549A patent/NZ241549A/en not_active IP Right Cessation
- 1992-02-07 CZ CS931643A patent/CZ164393A3/en unknown
- 1992-02-09 IL IL10090192A patent/IL100901A/en not_active IP Right Cessation
- 1992-02-10 RU SU5010881/02A patent/RU2060067C1/en not_active IP Right Cessation
- 1992-02-11 MX MX9200574A patent/MX9200574A/en unknown
- 1992-02-11 KR KR1019920001907A patent/KR920016174A/en not_active Withdrawn
- 1992-02-11 TN TNTNSN92011A patent/TNSN92011A1/en unknown
- 1992-02-11 BR BR929200461A patent/BR9200461A/en not_active IP Right Cessation
- 1992-02-11 CN CN92101435A patent/CN1032628C/en not_active Expired - Fee Related
- 1992-02-12 JP JP4025086A patent/JPH04319059A/en active Pending
-
1993
- 1993-08-10 FI FI933532A patent/FI933532A0/en not_active Application Discontinuation
Patent Citations (1)
| 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)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Vol. 9, No. 149, M390, Abstract of JP,A,60 027 407, publ 1985-02-12 (KAWASAKI SEITETSU K.K.). * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120028772A1 (en) * | 2009-03-12 | 2012-02-02 | Sandvik Intellectual Property Ab | Roller comprising a drive shaft and a roller ring, as well as a method for assembling such a roller |
| CN102069152A (en) * | 2010-12-22 | 2011-05-25 | 宁夏共享集团有限责任公司 | Modeling method of large-size ring-structure casting |
| EP2508670A1 (en) | 2011-04-04 | 2012-10-10 | Cellwood Machinery AB | Refining disc or refining disc segment |
| EP2508262A1 (en) | 2011-04-04 | 2012-10-10 | Cellwood Machinery AB | Method of provision of a fuel |
| 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 |
| JP2016203182A (en) * | 2015-04-16 | 2016-12-08 | 新日鐵住金株式会社 | Material selection method of roll for continuous casting, and roll for continuous casting |
Also Published As
| Publication number | Publication date |
|---|---|
| KR920016174A (en) | 1992-09-24 |
| HU216115B (en) | 1999-04-28 |
| FI933532A7 (en) | 1993-08-10 |
| JPH04319059A (en) | 1992-11-10 |
| BR9200461A (en) | 1992-10-20 |
| HUT65654A (en) | 1994-07-28 |
| FI933532A0 (en) | 1993-08-10 |
| EP0571465A1 (en) | 1993-12-01 |
| IL100901A (en) | 1994-04-12 |
| NZ241549A (en) | 1994-01-26 |
| MX9200574A (en) | 1993-01-01 |
| SE9100405D0 (en) | 1991-02-11 |
| IL100901A0 (en) | 1992-11-15 |
| ZA92832B (en) | 1992-11-25 |
| CN1032628C (en) | 1996-08-28 |
| RU2060067C1 (en) | 1996-05-20 |
| CN1064827A (en) | 1992-09-30 |
| TNSN92011A1 (en) | 1993-06-08 |
| CA2060768A1 (en) | 1992-08-12 |
| CZ164393A3 (en) | 1994-02-16 |
| HU9302321D0 (en) | 1993-10-28 |
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 | |
| US3689986A (en) | Method of casting composite cam shafts | |
| WO1992013651A1 (en) | Roll cast in one piece, comprising cemented carbide and cast iron, and method for its manufacture | |
| EP0753594B1 (en) | Composite roll | |
| US2964251A (en) | Roll structure | |
| CA2342104A1 (en) | Method for producing brake disks consisting of ceramic parts with metal hubs | |
| 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 | |
| US4056873A (en) | Composite guide roller for a rolling mill | |
| EP0374116B1 (en) | Roll ring, comprising cemented carbide and cast iron, and method for manufacture of the same | |
| US5248289A (en) | Cast iron roll with one or more cemented carbide roll rings metallurgically bonded thereto | |
| 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 | |
| JPS6014095B2 (en) | Alloy chilled roll material with excellent crack resistance and wear resistance | |
| JP2557711B2 (en) | Method of manufacturing single cam made of casting material and single cam manufactured thereby | |
| JPH0340102B2 (en) | ||
| JPH0152110B2 (en) | ||
| Murty | Horizontal centrifugal casting | |
| JPS6018252B2 (en) | Rolling roll with strong neck part | |
| JPH11226722A (en) | Composite roll for rolling | |
| JPH03138010A (en) | Manufacture of roll for rolling steel tube | |
| HU198866B (en) | Method for increasing the wear resistance of steel body particularly surfaces of solids of rotation exposed to abrasive, heat and hynamic load | |
| JP2000117310A (en) | Composite roll for rolling, and its manufacture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AK | Designated states |
Kind code of ref document: A1 Designated state(s): CS DK FI HU NO PL RO |
|
| AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE |
|
| DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
| WWE | Wipo information: entry into national phase |
Ref document number: 1992904709 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 933532 Country of ref document: FI Ref document number: 93-01109 Country of ref document: RO |
|
| WWE | Wipo information: entry into national phase |
Ref document number: PV1993-1643 Country of ref document: CZ |
|
| WWP | Wipo information: published in national office |
Ref document number: 1992904709 Country of ref document: EP |
|
| WWP | Wipo information: published in national office |
Ref document number: PV1993-1643 Country of ref document: CZ |
|
| LE32 | Later election for international application filed prior to expiration of 19th month from priority date or according to rule 32.2 (b) | ||
| EX32 | Extension under rule 32 effected after completion of technical preparation for international publication | ||
| WWW | Wipo information: withdrawn in national office |
Ref document number: 1992904709 Country of ref document: EP |
|
| WWR | Wipo information: refused in national office |
Ref document number: PV1993-1643 Country of ref document: CZ |