US3587708A - Method of continuous sheet metal production - Google Patents

Abstract

A METHOD OF CONTINUOUS SHEET METAL PRODUCTION IS PROVIDED, WHICH COMPRISIES IMMERSING WATER-COOLED ROLLS INTO A BATH OF MOLTEN METAL TO SUCH A DEPTH THAT THE MOLTEN METAL CONTACTS THE ROLLS OVER A PORTION OF THEIR CYLINDRICAL SURFACES CORRESPONDING TO CENTRAL ANGLES GREATER THAN 180* AND ROTATING THE ROLLS IN OPPOSITE DIRECTIONS TO DISCHARGE CRYSTALLIZED

METAL FROM THE BATH IN THE SHAPE OF A SHEET. ONE OF THE ROLLS IS PRESSED AGAINST THE SURFACE OF THE SHEET BEING PROCESSED AND THE SPEED OF ROTATION OF THE ROLLS IS CONTROLLED SUCH THAT ANY DEVIATION IN THE DESIRED THICKNESS OF THE OUTCOMING SHEET IS COMPENSATED BY VARIATION IN SPEED OF ROTATION OF THE ROLLS.

D R A W I N G

Description

United States Patent [72] Inventors Georgy Lukich Khimich ulitsa Lenina, 53, kv. 92; Vitaly Maximovich Nskovskikh, ulitsa Festivllnaya, 21, kv. 60; Stanislav Evgenievich Karlinsky, ulitsa Kultury, 4, kv.22, Sverdlovsk, U.S.S.R. [21] Appl. No. 707,087 [22] Filed Feb. 21, 1968 [45] Patented June 28, 1971 [54] METHOD OF CONTINUOUS SHEET METAL PRODUCTION 2 Claims, 2 Drawing Figs.

(52] [1.8. CI. 164/4, 1 164/87 [51] Int. Cl 822d 17/32, B22d 1/02 [50] .Field of Search 164/82, 86, 87,154, 277, 281, 4

[56] References Cited UNITED STATES PATENTS 3,498,362 3/1970 Lewis 164/277X n 13,ss7,7'0s

7 49,053 7/1965 Bessemer 164/277X 1,807,873 6/1931 Reece et a1... l64/87X 2,074,812 3/1937 Sendzimir..... 164/87 2,108,752 2/1938 Low 164/87 2,108,753 2/1938 Low 164/87 2,183,010 12/1939 Coxe 164/87 Erimary Examiner-J. Spencer Overholser Assistant Exam iner-R. Spencer Annear Atlorney- Waters, Roditi, Schwartz and Nissen ABSTRACT: A method of continuous sheet metal production is provided, which comprises immersing water-cooled rolls into a bath of molten metal to such a depth that the molten' PATENTEU JUH28 IQYI 3; 587,70

' sum 1 or 2 PATENTEU JUN28 [an SHEET 2 [IF 2 METHOD OF CONTINUOUS SHEET METAL PRODUCTION This invention relates to continuous casting of metals, and more particularly to methods of continuous sheet metal production.

Known at present are methods of continuous production of sheet metal according to which water-cooled rolls are immersed in a bath containing molten metal which crystallizes on the surface of the rolls, while the latter are rotated in opposite directions, for the purpose of discharging the crystallized metal between them in the shape of a metal sheet.

According to the known methods, the molten metal contacts the rolls over a certain portion of their cylindrical surfaces corresponding to central angles of to l5.

As a small surface area of the molten metal contacts the rolls, a greater portion of the roll surface is not utilized, resulting in a low output of the plant.

Besides, molten metal feed into the noncrystallized portion of the sheet between therolls is insufficient, which adversely affects the quality of the sheet.

In known methods referred to above, use is made of permanently fixed rolls with a constant gap between them, which results in either hampering the quality of the produced sheet, or the breaking of the rolls in case of deviation from specified working conditions, for example, temperature of water, metal,

etc. 1

An object of this invention is to provide a method of continuous sheet metal production which will ensure a higher output of the product.

Another object of this invention is to provide a method of continuous sheet metal production ensuring a stable process of production of high-quality sheet metal at a high speed of sheet discharge, and with close tolerances as to the cross section of the produced sheets.

These and other objects of the invention have been achieved in that according to the method of continuous sheet metal production according to this invention, the rolls are immersed in a bath with molten metal to such a depth that the molten metal contacts the rolls over a portion of their cylindrical surfaces corresponding to central angles greater than l80.

In order to rule out the influence of variations of the process parameters, such as the temperature of the metal, water, etc., one of the rolls is preferably pressed against the surface of the sheet being processed, while the speed of the roll rotation is controlled so that in case of increase of the thickness of the outcoming sheet their speed would also increase, and vice ver- Other objects of the-invention will be apparent from the following description' in connection with an embodiment of the invention as shown in the accompanying drawing in which:

HO. 1 is an elevation view of a device for effecting the method according to this invention; and

FIG. 2 is a plan view of the device.

The method of continuous sheet metal production consists in the following.

The water-cooled rolls 3 and 4 rotating in opposite directions are placed in a bath 1 (FIG. 1) containing molten metal 2, said rolls being immersed in said molten metal to such a depth that the level of the molten metal is above a horizontal plane drawn through the axes of rotation a-a (FIG. 2) of the rolls 3 and 4, thus ensuring the contact of the molten metal with a portion of the cylindrical surfaces of the rolls corresponding to central angles greater than This solution provides the possibility of utilizing the greater part of the working surface of the rolls and of continuous feeding of molten metal into the noncrystallized portion of the sheet located between the rolls 3 and 4.

As a result of contact with the surface of the water-cooled rolls 3 and 4, the metal crystallizes and in the shape of a sheet 5 (FIG. 1) is discharged between the rolls 3 and 4 from the bath 1.

The rolls 3 and 4 are driven from an electric motor 6 (FIG.

2) through a reduction ear 7.

In case of dev|at|on o the process parameters, such as temperature of metal, water, etc., from the specified values, the thickness of the produced sheets can-vary. In order to rule out the influence of the varying working conditions upon the production process, one of the rolls is pressed against the sur face of the processed sheet by means of a spring 9 mounted-on a rod 8, said spring being fixed between a stop 10 and pad ll of the roll 4, said pad holding the rod 8. Concurrently, the speed of rotation of the rolls is controlled by means of the rod 8 which acts upon an intermediate link 12, the latter, in turn, acting upon a pickup l3 sending a respective command to the electric motor 6 of the drive of the rolls 3 and 4.

Thus, for example, if the thickness of the outcoming sheet increases the rod 8 actuates the intermediate link 12 which operates the pickup 13.

The pickup sends the command to increase the speed of rotation of the electric motor 6, resulting in the increase of the speed of the rolls 3 and 4. Following this, the thickness of the processed sheet beings decreasing, until a specified value off thickness is restored.

Thus the method of continuous sheet metal production described hereinabove ensures high speeds of production combined with close tolerances as to sheet thickness.

We claim:

l. A method of continuous sheet metal production comprising immersing water-cooled rolls on whose surface crystalliza- 3 tion of metal takes place in a bath of molten metal to such a depth that the molten metal contacts the rolls over a portion of their cylindrical surfaces corresponding to central angles greater than 180, rotating said rolls in opposite directions for discharging the crystallized metal in the shape of a sheet between them, movably pressing one of the rolls against the surface of the sheet being processed, sensing any deviation in the desired thickness of the outcoming sheet, and controlling the speed of rotation of the rolls in response to said sensed deviation such that said deviation is compensated by variation in speed of rotation of the rolls.

2. A method as claimed in claim 11 wherein said sensing of deviation in the desired thickness of the outcoming sheet is effected by sensing the effect on the movable roll.

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