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
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:
Abstract
Description
Claims
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 |
ES2562625T3 (en) * | 2011-11-21 | 2016-03-07 | Hitachi Metals, Ltd. | Centrifugally cast composite roller and its production method |
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 EP EP92904709A patent/EP0571465A1/en not_active Withdrawn
- 1992-02-07 HU HUP9302321A patent/HU216115B/en not_active IP Right Cessation
- 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 KR KR1019920001907A patent/KR920016174A/en not_active Application Discontinuation
- 1992-02-11 MX MX9200574A patent/MX9200574A/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
- 1992-02-11 TN TNTNSN92011A patent/TNSN92011A1/en unknown
- 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 |
---|---|
TNSN92011A1 (en) | 1993-06-08 |
IL100901A0 (en) | 1992-11-15 |
RU2060067C1 (en) | 1996-05-20 |
BR9200461A (en) | 1992-10-20 |
ZA92832B (en) | 1992-11-25 |
CA2060768A1 (en) | 1992-08-12 |
KR920016174A (en) | 1992-09-24 |
SE9100405D0 (en) | 1991-02-11 |
CN1064827A (en) | 1992-09-30 |
CZ164393A3 (en) | 1994-02-16 |
CN1032628C (en) | 1996-08-28 |
FI933532A (en) | 1993-08-10 |
FI933532A0 (en) | 1993-08-10 |
IL100901A (en) | 1994-04-12 |
EP0571465A1 (en) | 1993-12-01 |
MX9200574A (en) | 1993-01-01 |
HU9302321D0 (en) | 1993-10-28 |
HUT65654A (en) | 1994-07-28 |
JPH04319059A (en) | 1992-11-10 |
HU216115B (en) | 1999-04-28 |
NZ241549A (en) | 1994-01-26 |
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