LU85578A1 - LAYOUT OF THE LAST FINISHING CAGES OF A HOT STRIP TRAIN - Google Patents
LAYOUT OF THE LAST FINISHING CAGES OF A HOT STRIP TRAIN Download PDFInfo
- Publication number
- LU85578A1 LU85578A1 LU85578A LU85578A LU85578A1 LU 85578 A1 LU85578 A1 LU 85578A1 LU 85578 A LU85578 A LU 85578A LU 85578 A LU85578 A LU 85578A LU 85578 A1 LU85578 A1 LU 85578A1
- Authority
- LU
- Luxembourg
- Prior art keywords
- last finishing
- injection
- arrangement
- cylinders
- finishing cages
- Prior art date
Links
Classifications
-
- 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
-
- 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
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
- B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Tires In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
- 2 -- 2 -
La présente invention concerne les cylindres de laminoirs à deux métaux en fonte haut-chrome destinés à équiper les dernières cages finisseuses d'un train à bandes à chaud·The present invention relates to rolls of two-metal rolling mills made of high-chromium cast iron intended to equip the last finishing stands of a hot strip train ·
Les types de cylindres utilisés actuellement dans ces cages finisseuses sont des cylindres en fonte à deux métaux· Ces cylindres ont des duretés comprises entre 75 Shore C et 85 Shore C en début de vie. Ils sont coulés statiquement ou par centrifugation·The types of cylinders currently used in these finishing cages are cast iron cylinders with two metals · These cylinders have hardnesses between 75 Shore C and 85 Shore C at the start of their life. They are cast statically or by centrifugation ·
Ces cylindres connus présentent la caractéristique de voir leur dureté décroître en fonction du diamètre. La centrifugation avait apporté une légère amélioration à ce point de vue. Néanmoins« cette chute de dureté oblige à utiliser ces cylindres neufs dans la dernière cage, de manière à profiter au maximum de la dureté la plus élevée. En effet, la qualité de surface des cylindres en dernière cage détermine la qualité du produit fini.These known cylinders have the characteristic of seeing their hardness decrease as a function of the diameter. Centrifugation had brought a slight improvement from this point of view. However “this drop in hardness means that these new cylinders must be used in the last cage, so as to make the most of the highest hardness. Indeed, the surface quality of the cylinders in the last cage determines the quality of the finished product.
\ La détérioration progressive en cours de laminage de la surface de ces cylindres oblige à des changements fréquents .\ The progressive deterioration during rolling of the surface of these rolls requires frequent changes.
On se heurte depuis plusieurs années au fait qu'un acroissement de dureté est irréalisable avec ce type de cylindres car on fragilise la couche externe, et que toute amélioration de dureté comporte des risques d'accidents.For several years, we have come up against the fact that an increase in hardness cannot be achieved with this type of cylinder because the outer layer is weakened, and that any improvement in hardness involves the risk of accidents.
Il y a une dizaine d'années, des essais ont été effectués à Port-Talbot (British Steel Corporation) avec - 3 - des cylindres haut-chrome ayant des pourcentages de chrome compris entre l8 % et 30 %· Ces cylindres avaient des duretés comprises entre 75 Shore C et 80 Shore C,A decade ago, tests were carried out at Port-Talbot (British Steel Corporation) with - 3 - high-chromium cylinders having percentages of chromium between 18% and 30% · These cylinders had hardnesses between 75 Shore C and 80 Shore C,
Ces teneurs en chrome permettent d'obtenir une résistance à l'usure très élevée, supérieure à celle des cylindres fonte mais il est apparu un phénomène de collage localisé. Ce dernier occasionnait des défauts de surface sur le cylindre, défauts qui étaient transférés par après à la tôle.These chromium contents make it possible to obtain a very high wear resistance, greater than that of the cast iron cylinders, but a phenomenon of localized bonding has appeared. The latter caused surface defects on the cylinder, defects which were later transferred to the sheet.
Pour remédier aux divers inconvénients décrits ci-dessus il a paru avantageux suivant l'invention de créer un aménagement des dernières cages finisseuses d'un train à bandes chaud, caractérisé en ce qu'il consiste dans l'utilisation de cylindres, dont la composition chimique dans la zone externe de travail se situe entre 2,5 % et 3,5 % de carbone, entre l8 % et 30 % de chrome et entre 0,5 % et 5 % de molybdène, et dans l'injection sous pression d'une émulsion de lubrifiant de laminage, de manière à pallier au manque d'oxydes lubrifiants présents à la surface des cylindres.To remedy the various drawbacks described above, it appeared advantageous according to the invention to create an arrangement of the last finishing stands of a hot strip train, characterized in that it consists in the use of cylinders, the composition of which chemical in the external work area is between 2.5% and 3.5% carbon, between 18% and 30% chromium and between 0.5% and 5% molybdenum, and in the pressure injection d an emulsion of rolling lubricant, so as to compensate for the lack of lubricating oxides present on the surface of the rolls.
Suivant l'invention cette injection d'émulsion de lubrifiant de laminage est réalisée sur les cylindres de travail inférieurs et supérieurs sous pression, à l'entrée ou 4 à la sortie de la cage.According to the invention, this injection of rolling lubricant emulsion is carried out on the lower and upper working rolls under pressure, at the inlet or 4 at the outlet of the cage.
Suivant une variante de l'invention cette injection d'émulsion de lubrifiant de laminage est réalisée sur les deux faces de la bande à l'entrée de la cage.According to a variant of the invention, this injection of rolling lubricant emulsion is carried out on the two faces of the strip at the entrance to the stand.
La solution préconisée suivant l'invention, consis-" tant à utiliser pour les cylindres une fonte à haut-chrome associée à un équipement de lubrification, permet d'éviter les collages obtenus dans le passe et qui éliminaient ce type de cylindre.The solution recommended according to the invention, consisting in "using a high-chromium cast iron for the cylinders associated with lubrication equipment, makes it possible to avoid the stickings obtained in the past and which eliminated this type of cylinder.
D'autre part, les compositions chimiques des cylindres suivant l'invention permettent d'obtenir dans la - k - couche extérieure du cylindre des duretés plus élevées que celles utilisées aujourd'hui dans la gamme 75 Shore C -95 Shore C) avec les cylindres en fonte et des caractéristiques mécaniques supérieures, et notamment une limite élastique importante. Ce dernier point est particulièrement intéressant car il permet d'éviter très souvent les marquages.On the other hand, the chemical compositions of the cylinders according to the invention make it possible to obtain in the - k - outer layer of the cylinder higher hardnesses than those used today in the range 75 Shore C -95 Shore C) with the cast iron cylinders and superior mechanical characteristics, in particular a significant elastic limit. This last point is particularly interesting because it very often avoids marking.
Le type de cylindres utilisé suivant l'invention a donc deux avantages : _1· importante résistance à l'usure, ce qui permet de conserver un profil identique pendant un temps très long ; 2^. résistances mécaniques telles que l'on évite les marquages·The type of cylinders used according to the invention therefore has two advantages: _1 · high resistance to wear, which makes it possible to maintain an identical profile for a very long time; 2 ^. mechanical resistance such that markings are avoided ·
Et, avec la lubrification suivant l'invention, on évite les problèmes de collage en surface·And, with the lubrication according to the invention, the problems of surface bonding are avoided ·
On n'a pas décrit ci-dessus les conditions de la lubrification en ce qui concerne la concentration de l'émulsion, la pression d'injection et le débit· Celles-ci seront fonction des applications envisagées.The lubrication conditions have not been described above with regard to the concentration of the emulsion, the injection pressure and the flow rate. These will depend on the applications envisaged.
4 »4 "
Claims (4)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU85578A LU85578A1 (en) | 1984-10-08 | 1984-10-08 | LAYOUT OF THE LAST FINISHING CAGES OF A HOT STRIP TRAIN |
DE1985201612 DE178724T1 (en) | 1984-10-08 | 1985-10-05 | OPERATING ARRANGEMENT OF THE LAST FINISHED ROLLING MILLS IN A HOT-TREAD MILL. |
EP85201612A EP0178724A1 (en) | 1984-10-08 | 1985-10-05 | Arrangement for the last stands of a finishing mill in the hot-rolling of strip |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU85578 | 1984-10-08 | ||
LU85578A LU85578A1 (en) | 1984-10-08 | 1984-10-08 | LAYOUT OF THE LAST FINISHING CAGES OF A HOT STRIP TRAIN |
Publications (1)
Publication Number | Publication Date |
---|---|
LU85578A1 true LU85578A1 (en) | 1986-06-11 |
Family
ID=19730335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
LU85578A LU85578A1 (en) | 1984-10-08 | 1984-10-08 | LAYOUT OF THE LAST FINISHING CAGES OF A HOT STRIP TRAIN |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0178724A1 (en) |
DE (1) | DE178724T1 (en) |
LU (1) | LU85578A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3709012A (en) * | 1971-01-04 | 1973-01-09 | Nalco Chemical Co | Hot rolling mill lubrication apparatus and process |
DE2244379C3 (en) * | 1972-09-09 | 1979-08-23 | Ludwig-Eugen Dr.-Ing. 4300 Essen Rohde | Device for avoiding roller shuttering during rolling, especially cold rolling with the use of hydrogen-containing lubricants |
US3803888A (en) * | 1973-03-07 | 1974-04-16 | Bethlehem Steel Corp | Method of reducing rolling mill roll wear |
FR2464741A1 (en) * | 1979-09-07 | 1981-03-20 | Usinor | COMPACTION COMPOSITE CYLINDER |
FR2469221A1 (en) * | 1979-11-13 | 1981-05-22 | Usinor | HAMMER ROLLER CYLINDER |
NL8102040A (en) * | 1981-04-24 | 1982-11-16 | Kubota Ltd | PROCESSING ROLLER WITH HIGH CHROME CONTENT, AND METHOD OF MANUFACTURING THE SAME |
US4546527A (en) * | 1981-12-01 | 1985-10-15 | Kubota Ltd. | Composite sleeve for use in rolling rolls for H-section steel and channel steel |
-
1984
- 1984-10-08 LU LU85578A patent/LU85578A1/en unknown
-
1985
- 1985-10-05 EP EP85201612A patent/EP0178724A1/en not_active Withdrawn
- 1985-10-05 DE DE1985201612 patent/DE178724T1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0178724A1 (en) | 1986-04-23 |
DE178724T1 (en) | 1987-02-05 |
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