GB1589220A - Process for casting molten metal in casting machines having at least one casting belt - Google Patents
Process for casting molten metal in casting machines having at least one casting belt Download PDFInfo
- Publication number
- GB1589220A GB1589220A GB37982/77A GB3798277A GB1589220A GB 1589220 A GB1589220 A GB 1589220A GB 37982/77 A GB37982/77 A GB 37982/77A GB 3798277 A GB3798277 A GB 3798277A GB 1589220 A GB1589220 A GB 1589220A
- Authority
- GB
- United Kingdom
- Prior art keywords
- casting
- belt
- process according
- zone
- parting agent
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
- B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
(54) IMPROVED PROCESS FOR CASTING MOLTEN METAL IN CASTING
MACHINES HAVING AT LEAST ONE CASTING BELT
(71) We, HAZELETT STRIP-CASTING CORPORATION a corporation organised and existing under the laws of the State of Delaware. United States of America. of Malletts
Bay. Winooski, Vermont ()54()4, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to a process for casting molten metal in casting machines having at least one endless casting belt. such as twin-belt casters and wheel casters.
In those machines, an endless casting belt revolves around pulleys and passes along a casting zone from the input end to the output end thereof; during its travel from the output end to the input end of the casting zone, the casting belt has to be covered on its casting side with a layer of a parting agent in order to avoid in the casting zone adhesion of the metal being cast to the casting belt: that parting agent may also be used as thermal barrier for controlling cooling conditions in the casting zone.
A known method for applying such a parting agent consists in exposing the casting side of the casting belt to a reducing flame, whereby a layer of soot is deposited on it. Soot being hygroscopic. this method presents the disadvantage that it may induce porosity in the cast metal. Moreover, this method is particularly air-polluting, since the entire environment of the casting machine becomes rapidly charged with very fine soot particles.
Another known method consists in applying upon the casting belt by spraying or brushing, a layer of a dispersion of a parting agent. e.g. a mixture of colloidal graphite and a resinous binder, in a highly volatile liquid such as trichloroethane (boiling point: 74,1 C), whereby the casting belt re-enters the casting zone. apparently in a completely dry state.
This method has been found by the Applicant to produce porosity in the cast metal.
It is an object of the present invention to provide a process for casting molten metal in a casting machine having at least one endless revolving casting belt, which process reduces porosity in the cast metal.
To this end and from one aspect, the present invention consists in a process of casting molten metal in a casting machine wherein at least one endless casting belt revolves around pulleys and passes along a casting zone from its input end to its output end and wherein the casting belt during its travel from the output end to the input end receives on its casting side a layer of a parting agent dispersed in a liquid, characterized by heating the casting belt during said travel to such an extent that the parting agent layer which enters into the casting zone is thermally stable in that zone.
By thermally stable is meant that the layer of parting agent does not give rise to gas formation either by volatilisation or by thermal decomposition at the tempeflitureof the casting belt in the casting zone.
The thermal behaviour of various commercially available parting agents has been studied in the laboratory. Casting belt samples measuring 0. 10 x (). I() metre have been provided on one side with a layer of a parting agent dispersion. the layer thickness (about 0,060 mm) being the same as that used normally in industrial casting operations. The samples have been subjected to a thermal treatment in an electrical furnace, then cooled in the air to about 100"C and finally reheated within the range of temperature to which casting belts are normally brought in the casting zone (250 - 350"C). Reheating has been done in an electric furnace equipped with a photoelectric cell for fume detection. Results obtained with a dispersion of Aqualon in trichloroethane (100 g. of Aqualon per liter of dispersion),
Aqualon being the trade name for a colloidal graphite based parting agent sold by Prohag,
Bamberg, West-Germany, are given in the table below.
TABLE
thermal treatment reheating temp. "C. fume detected
(samples held for 1 minute upon reheating
temp. "C time in sec. at the given temp.)
350 6 350 yes
350 6 300 yes
350 6 250 yes
350 8 350 yes
350 8 300 yes
350 8 250 no
350 10 350 no
350 10 300 no
350 10 250 no
350 12 350 no
350 12 300 no
350 12 250 no
300 6 350 yes
300 6 300 yes
300 6 250 yes
300 8 350 yes
300 8 300 yes
300 8 250 yes
300 10 350 yes
300 10 300 no
300 10 250 no
300 12 350 yes
300 12 300 no
300 12 250 no
250 6 300 yes
250 6 250 yes
250 8 300 yes
250 8 250 yes
250 10 30() yes
250 10 25() no
250 12 300 yes
250 12 250 no
Nearly the same results have been obtained with
- a dispersion of Aqualon in water (100 g. of Aqualon per liter of dispersion);
- a dispersion of Endugraco in trichloroethane (150 g. of Endugraco per liter of
dispersion), Endugraco being the tradename for a graphite based parting agent sold
by Etablissements Paul Lacroix, Liege, Belgium;
- a dispersion of Foliac X in trichloroethane (100 g. of Foliac X per liter of dispersion),
Foliac X being the tradename for a graphite based parting agent sold by Société Anonyme Morgan, Brussels, Belgium, and
- a dispersion of Top Coat WO 133D in trichloroethane (100 g. of Top Coat WO 133 D
per liter of dispersion), Top Coat WO 133 D being the tradename for a graphite based
parting agent sold by Acheson Colloids B.V., Scheemda, The Netherlands.
It has surprisingly been found that such treatment does not affect the parting power of the layer of parting agent.
From another aspect, the present invention consists in a process of casting molten metal in a casting machine wherein at least one endless casting belt revolves around pulleys and passes along a casting zone from its input end to its output end and wherein the casting belt during its return travel from the output end to the input end receives on its casting side a layer of a parting agent dispersed in a liquid, characterized by heating the casting belt during said return travel for at least 10 seconds to a temperature which is at least equal to the highest temperature to which the casting belt is brought in the casting zone, whereby the parting agent layer which enters the casting zone is thermally stable in that zone.
It is particularly advantageous to have the casting belt re-entering the casting zone at a temperature of at least 100"C. Thus, condensation of air humidity upon the re-entering belt is avoided.
In order to avoid excessive local heating of the belt, the casting belt is preferably heated before as well as after applying said layer. For the same reasons, it is particularly useful to heat the belt on both its sides.
Heating may be carried out in any way; highly suitable heating means include electrical, steam, flame and hot air heating.
It may be useful to heat internally, preferably by means of steam or hot air, that pulley which deflects the casting belt towards the position wherein it receives said layer, especially if the casting belt's travel from the output end to the input end of the casting zone is short.
Water is preferably used as the dispersion liquid.
Suitable parting agents include those which contain at least one of bone ash (Ca3PO4), colloidal graphite, alumina and diatomite.
Thanks to the fact that casting belt heating is provided, the process of the present invention makes it possible to cool the cast metal as it leaves the casting zone by direct contact with a liquid coolant, e.g. by water spraying, whereby the capacity of the casting machine is increased; the coolant, which adheres then to the casting belt when the latter leaves the casting zone, is preferably wiped off before the belt is heated. When applying such cooling without belt heating, it would be impossible to have the belt reentering the casting zone in a dry state.
The process according to the present invention is particularly suited for the continuous casting of high melting point metals such as copper and steel.
In order that the invention may be more readily understood reference will now be made to the accompanying diagrammatical drawings which show two modes of carrying out the process according to the invention and in which:
Figure 1 is a longitudinal section taken across a twin-belt caster,
Figure 2 is a section, on a larger scale, of the casting device taken along line X-X of
Figure 1,
Figure 3 is a longitudinal section, taken across a wheel caster, and
Figure 4 is a section, on a larger scale, of the casting device made along line Y-Y of
Figure 3.
Referring to Figures 1 and 2 the casting zone 1 of a twin-belt caster to which molten metal is fed at 2 and from which cast metal issues at 3 is delimited by two endless casting belts 4 revolving around drive pulleys 5 and tension pulleys 6 and by two side dams 7 moving forward in the same direction as belts 4. A dispersion of a parting agent in a liquid is sprayed at 8 upon the belts 4.
Belts 4 are heated over their entire width by electrical or hot air heating devices 9. The cast metal is cooled at 3 by water sprays 10. Cooling water which adheres to belts 4 is wiped off at 11.
In Figures 3 and 4, the casting zone 12 of a wheel caster to which molten metal is fed in 13 and from which cast metal issues at 14 is delimited by the groove of a casting wheel 15 and by an endless casting belt 16 revolving around wheel 15 and pulleys 17. A dispersion of a parting agent is sprayed at 18 upon belt 16. Belt 16 is heated over its entire width by electrical or hot air heating devices 19.
Reference will now made to the following Examples.
Example 1
In a twin-belt caster of the type illustrated in Figures l and 2 having a casting zone with a length of 4 metres, a height of 0.05 metre and a width of 0.12 metres, a copper bar was cast at a maximum speed of about 14 metres/minute. There was no direct cooling of the bar at the exit of the casting zone. Maximum temperature of the belts in the casting zone was about 300"C and temperature of the belts at the exit of the casting zone was about 30"C.
After leaving the tension pulleys the belts were heated to about 220"C, then covered by spraying with a layer of an aqueous dispersion of Aqualon (6 litres/hour/belt) and finally reheated again to about 350"C for about 12 seconds before reaching the drive pulleys.
The casting belts re-entered the casting zone at a temperature of about 130"C. No porosity was found in the cast bar.
Example 2
The same method as in Example 1 has been used, except that the cast metal bar has been directly cooled at the exit of the casting zone by means of water at a temperature of 25 to 30"C and a flow rate of 850 to 1250 litres/minute, the cooling water adhering to the belts being wiped therefrom before the belts are heated. Tests have shown that this direct cooling of the cast metal allows an increase in the maximum casting speed of about 50%.
WHAT WE CLAIM IS:
1. A process of casting molten metal in a casting machine wherein at least one endless casting belt revolves around pulleys and passes along a casting zone from its input end to its output end and wherein the casting belt during its travel from the output end to the input end receives on its casting side a layer of a parting agent dispersed in a liquid, characterized by heating the casting belt during said travel to such an extent that the parting agent layer which enters into the casting zone is thermally stable in that zone.
2. A process of casting molten metal in a casting machine wherein at least one endless casting belt revolves around pulleys and passes along a casting zone from its input end to its output end and wherein the casting belt during its return travel from the output end to the input end receives on its casting side a layer of a parting agent dispersed in a liquid, characterized by heating the casting belt during said return travel for at least 10 seconds to a temperature which is at least equal to the highest temperature to which the casting belt is brought in the casting zone, whereby the parting agent layer which enters into the casting zone is thermally stable in that zone.
3. A process according to claim 2, wherein the casting belt is heated at a temperature of at least 250"C. for at least 10 seconds after receiving the parting agent layer.
4. A process according to claim 2, wherein the casting belt is heated at a temperature of at least 350"C. for at least 10 seconds after receiving the parting agent layer and the casting belt is at a temperature of at least 100"C. when it enters the casting zone.
5. A process according to claim 1, 2 or 3, wherein the casting belt re-enters the casting zone at a temperature of at least 100"C.
6. A process according to any one of claims 1 to 5, wherein the casting belt is also heated prior to receiving the parting agent layer.
7. A process according to claim 6, wherein the temperature to which the casting belt is heated prior to receiving the parting agent layer is less than the temperature to which it is subsequently heated.
8. A process according to claim 6 or 7, wherein the cast metal is cooled as it leaves the casting zone by direct contact with a liquid coolant whereby liquid coolant adheres to the casting belt when it starts said travel, the liquid coolant is wiped from the casting belt, and the casting belt is heated subsequent to such wiping and prior to receiving the parting agent layer.
9. A process according to any one of claims 1 to 8, wherein the casting belt is heated on its both sides.
10 A process according to any one of claims 1 to 9, wherein the casting belt is heated by electrical means, steam, flame or hot air.
11. A process according to any one of claims 1 to 10, wherein the pulley, which deflects the casting belt towards the position whereat the casting belt receives the parting agent layer, is internally heated.
12. A process according to any one of claims 1 to 11, wherein the liquid is water.
13. A process according to any one of claims 1 to 12, wherein the parting agent includes at least one of bone ash, colloidal graphite, alumina and diatomite.
14. A process according to any one of claims 1 to 13, wherein the cast metal is copper or steel.
15. A metal casting process according to claim 1 or 2, and substantially as hereinbefore described.
16. A metal casting process substantially as hereinbefore described with reference to
Figures 1 and 2 of the accompanying drawings.
17. A metal casting process substantially as hereinbefore described with reference to
Figures 3 and 4 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (19)
1. A process of casting molten metal in a casting machine wherein at least one endless casting belt revolves around pulleys and passes along a casting zone from its input end to its output end and wherein the casting belt during its travel from the output end to the input end receives on its casting side a layer of a parting agent dispersed in a liquid, characterized by heating the casting belt during said travel to such an extent that the parting agent layer which enters into the casting zone is thermally stable in that zone.
2. A process of casting molten metal in a casting machine wherein at least one endless casting belt revolves around pulleys and passes along a casting zone from its input end to its output end and wherein the casting belt during its return travel from the output end to the input end receives on its casting side a layer of a parting agent dispersed in a liquid, characterized by heating the casting belt during said return travel for at least 10 seconds to a temperature which is at least equal to the highest temperature to which the casting belt is brought in the casting zone, whereby the parting agent layer which enters into the casting zone is thermally stable in that zone.
3. A process according to claim 2, wherein the casting belt is heated at a temperature of at least 250"C. for at least 10 seconds after receiving the parting agent layer.
4. A process according to claim 2, wherein the casting belt is heated at a temperature of at least 350"C. for at least 10 seconds after receiving the parting agent layer and the casting belt is at a temperature of at least 100"C. when it enters the casting zone.
5. A process according to claim 1, 2 or 3, wherein the casting belt re-enters the casting zone at a temperature of at least 100"C.
6. A process according to any one of claims 1 to 5, wherein the casting belt is also heated prior to receiving the parting agent layer.
7. A process according to claim 6, wherein the temperature to which the casting belt is heated prior to receiving the parting agent layer is less than the temperature to which it is subsequently heated.
8. A process according to claim 6 or 7, wherein the cast metal is cooled as it leaves the casting zone by direct contact with a liquid coolant whereby liquid coolant adheres to the casting belt when it starts said travel, the liquid coolant is wiped from the casting belt, and the casting belt is heated subsequent to such wiping and prior to receiving the parting agent layer.
9. A process according to any one of claims 1 to 8, wherein the casting belt is heated on its both sides.
10 A process according to any one of claims 1 to 9, wherein the casting belt is heated by electrical means, steam, flame or hot air.
11. A process according to any one of claims 1 to 10, wherein the pulley, which deflects the casting belt towards the position whereat the casting belt receives the parting agent layer, is internally heated.
12. A process according to any one of claims 1 to 11, wherein the liquid is water.
13. A process according to any one of claims 1 to 12, wherein the parting agent includes at least one of bone ash, colloidal graphite, alumina and diatomite.
14. A process according to any one of claims 1 to 13, wherein the cast metal is copper or steel.
15. A metal casting process according to claim 1 or 2, and substantially as hereinbefore described.
16. A metal casting process substantially as hereinbefore described with reference to
Figures 1 and 2 of the accompanying drawings.
17. A metal casting process substantially as hereinbefore described with reference to
Figures 3 and 4 of the accompanying drawings.
18. A metal casting process substantially as hereinbefore described with reference to
Example 1 or Example 2.
19. A metal casting apparatus when used for carrying out the process claimed in any preceding claim.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7627471A FR2364078A1 (en) | 1976-09-13 | 1976-09-13 | IMPROVED PROCESS FOR THE CASTING OF MELT METAL IN CASTING MACHINES HAVING AT LEAST ONE CASTING BAND |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1589220A true GB1589220A (en) | 1981-05-07 |
Family
ID=9177618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37982/77A Expired GB1589220A (en) | 1976-09-13 | 1977-09-12 | Process for casting molten metal in casting machines having at least one casting belt |
Country Status (11)
Country | Link |
---|---|
JP (1) | JPS5335633A (en) |
AT (1) | ATA653877A (en) |
BR (1) | BR7706012A (en) |
CA (1) | CA1089185A (en) |
DE (1) | DE2740477A1 (en) |
FR (1) | FR2364078A1 (en) |
GB (1) | GB1589220A (en) |
IT (1) | IT1085182B (en) |
SE (1) | SE7710265L (en) |
YU (1) | YU217677A (en) |
ZA (1) | ZA775237B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1182618A (en) * | 1980-10-22 | 1985-02-19 | Robert W. Hazelett | Steam preheating the endless flexible casting belt in a continuous casting machine |
JPS58187768A (en) * | 1982-04-26 | 1983-11-02 | 日立造船株式会社 | Heat recovery absorption heat pump |
JPS60180652A (en) * | 1984-02-28 | 1985-09-14 | Sumitomo Heavy Ind Ltd | Endless track type continuous casting machine |
JPS60257953A (en) * | 1984-06-05 | 1985-12-19 | Mitsubishi Heavy Ind Ltd | Belt type continuous casting device |
JPS60257952A (en) * | 1984-06-05 | 1985-12-19 | Mitsubishi Heavy Ind Ltd | Belt type continuous device |
JPS6277161A (en) * | 1985-09-27 | 1987-04-09 | Sumitomo Metal Ind Ltd | Belt caster for producing thin ingot |
CA2096365A1 (en) * | 1992-06-23 | 1993-12-24 | Donald G. Harrington | Method and apparatus for continuous casting of metals |
JP5650410B2 (en) * | 2010-01-21 | 2015-01-07 | 帝人株式会社 | Method for dyeing aramid fiber fabric |
-
1976
- 1976-09-13 FR FR7627471A patent/FR2364078A1/en active Granted
-
1977
- 1977-08-29 ZA ZA00775237A patent/ZA775237B/en unknown
- 1977-09-06 CA CA286,090A patent/CA1089185A/en not_active Expired
- 1977-09-08 DE DE19772740477 patent/DE2740477A1/en not_active Withdrawn
- 1977-09-09 BR BR7706012A patent/BR7706012A/en unknown
- 1977-09-12 IT IT27453/77A patent/IT1085182B/en active
- 1977-09-12 GB GB37982/77A patent/GB1589220A/en not_active Expired
- 1977-09-12 AT AT0653877A patent/ATA653877A/en not_active Application Discontinuation
- 1977-09-13 SE SE7710265A patent/SE7710265L/en not_active Application Discontinuation
- 1977-09-13 JP JP11041077A patent/JPS5335633A/en active Granted
- 1977-09-13 YU YU02176/77A patent/YU217677A/en unknown
Also Published As
Publication number | Publication date |
---|---|
CA1089185A (en) | 1980-11-11 |
SE7710265L (en) | 1978-03-14 |
ZA775237B (en) | 1978-07-26 |
IT1085182B (en) | 1985-05-28 |
FR2364078B1 (en) | 1979-01-12 |
JPS613579B2 (en) | 1986-02-03 |
DE2740477A1 (en) | 1978-03-23 |
YU217677A (en) | 1982-08-31 |
BR7706012A (en) | 1978-06-20 |
ATA653877A (en) | 1986-05-15 |
FR2364078A1 (en) | 1978-04-07 |
JPS5335633A (en) | 1978-04-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR101094568B1 (en) | Casting steel strip with low surface roughness and low porosity | |
JP3260487B2 (en) | Apparatus and method for continuous belt casting of metal strip | |
ATE153573T1 (en) | METHOD AND DEVICE FOR CONTINUOUS STRIP CASTING | |
US4751957A (en) | Method of and apparatus for continuous casting of metal strip | |
GB1589220A (en) | Process for casting molten metal in casting machines having at least one casting belt | |
US20150354049A1 (en) | Method of coating a substrate | |
BR9402099A (en) | Process and apparatus for melting metal strip | |
GB2113586A (en) | Coolant control in em casting | |
EP0605094A1 (en) | Contained quench system for controlled cooling of continuous web | |
KR101286890B1 (en) | Casting steel strip | |
JPS6254577B2 (en) | ||
US4069860A (en) | Ablative band for a casting machine | |
WO1996001708B1 (en) | Twin-roll caster and rolling mill for use therewith | |
JPS5814816B2 (en) | Abrasive material casting method and device | |
WO1987002285A1 (en) | Method of and apparatus for continuous casting of metal strip | |
JPS561251A (en) | Continuous casting method | |
JP3308102B2 (en) | Metal strip continuous casting method | |
US4756357A (en) | Process and device for controlling the rate of cooling a continuously cast ingot | |
CN113453820A (en) | Short belt side dam for twin belt caster | |
US3857434A (en) | Roll-couple, continuous-strip casting | |
KR101076090B1 (en) | Casting steel strip | |
JPH0445286A (en) | Production of hot dipping bandlike metal | |
JPH08150443A (en) | Detection of abnormality of casting in twin belt type continuous caster | |
SU818792A1 (en) | Method of plasma-arc cleaning of billet surface | |
SU382713A1 (en) | HEATING LINE FOR THERMAL TREATMENT |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |