JPS58209452A - roll casting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for continuously casting gold PAt in strip form, and more particularly to a new and improved rollcaster in which the shell of the casting roll is cooled substantially isothermally. It is well known to use internally cooled rollers in the continuous casting of molten gold in strip form. Hunter, U.S. Pat. No. 285Q776, describes a plurality of helical coolant channels k.
A roller for a continuous casting machine having the following is disclosed. The spiral structure of each coolant channel allows the coolant to flow through only one revolution within each channel. The patent states that this configuration allows the coolant in all channels to be exposed equally to the shell of the roller, thereby uniformly removing heat from the shell of the roller. However, this H++nte
The R patent states that during the casting process there is a slight temperature gradient from one end of the roller to the other, and that this temperature gradient has no appreciable effect on the operation of the roller. German Patent No. L50a927, issued December 6, 1973, discloses an internally cooled roller having a core and a sleeve. The helical coolant flow path is narrow between the core and the sleeve and has alternating inlets 1r on one front surface or the other front surface of the roller. An inflow passage and an outflow passage enter and discharge from the four sides of the core of the roller. (U.S. Pat. No. 3,7143, awarded to lcrding
No. 66 and No. 484 to No. 810 are both equipped with a rotating rotary drum (tml) which is internally liquid-cooled and has a spider carrying rollers in radial slots, which are rotated by centrifugal force. A roller is rolling on the inner surface of the drum. The spider rotates at a suitable speed and projects the cooling liquid onto the inner surface of the drum by centrifugal force. These patents also state that the action of the rollers on the inner surface of the drum subdivides the initial film boiling. U.S. Pat. No. 4,074,750 to Beghin discloses an internal cooling roll having two coaxial trunnions and a cylindrical body. The internal cooling roll may include a plurality of uniformly spaced cylindrical longitudinal conduits arranged annularly around the axis of the cylinder, or a single annular longitudinal conduit uniformly spaced therein. It can have a tubular conduit or an annular longitudinal conduit with one tube coaxially installed therein, or it can have a cylindrical longitudinal conduit with a tubular conduit coaxially installed therein. Means for circulating cooling fluid through the conduits and supplying cooling fluid to one of the conduits and removing the cooling fluid from the other conduit includes a fluid trap in a passageway in one of the trunnions.
element is provided. 8 U.S. Patent No. 3.75” to Ofinsky et al.
No. 7;847 describes a roll mold with a cooling device Il. Each roll has an axis within the sleeve, a central hole, a circular passageway, and a radial passageway. The whole header is provided in this central hole, and the radial passage is divided into all separate parts,
They are a part that supplies cooling fluid and a part that discharges cooling fluid. C's US patent supplies a cooling device with a constant wrinkle of coolant at the same degree. It states that heat can be removed uniformly from the hot metal over the entire length and height of the crystallization zone. U.S. Pat. No. 279Q216 to Hunter discloses a cooling system in rollers for metal chain production. Each roller has a core and a shell over the core. There is a longitudinal channel on the surface of the core. Its ends communicate with an annular groove, and the radial passage intersects this annular groove. The roller has a central hole with a closed dust hole. A conduit t forming an internal passage communicating with the central hole extends entirely through the closed bore. The coolant flows through this closed hole. It then passes outwardly through a set of radial passageways into a longitudinal aperture. This flow of coolant continues through the longitudinal holes, through another set of radial passages, and then into the central hole. Return to the conduit and return pipe extending through the closed dust hole. British Patent Specification No. 897.412 discloses a cooling arrangement m' for casting rolls. Each casting roll has a core and
and a sleeve over this core. There are two longitudinal inlet channels and two longitudinal outlet channels within this core. The longitudinal inlet channel and the longitudinal outlet channel communicate with the periphery of the core through small channels. These isometric channels open into an annular groove at the periphery of the core. The coolant enters the longitudinal introduction channel. All of these small communicating channels flow upward into the annular groove. The coolant then flows through the annular groove and exits the annular groove through a smaller through hole, such as a cylindrical hole, which communicates with the longitudinal delivery channel. British Patent Specification No. L31'a185 describes an internally cooled roller. Each casting roller is hollow and mounted on two hollow shafts. The first hollow shaft serves as an inlet for the coolant, and the second hollow shaft serves for discharging the coolant. The first hollow shaft communicates with a plurality of tubes disposed radially within the roller. The radially disposed vessels communicate with horizontal tubes suitably spaced within the rollers. This horizontal pipe has a nozzle that sprays the entire inner surface of the row 2 with coolant. This coolant is discharged from the casting roller by means of a second hollow shaft. A second hollow shaft extends centrally within the casting roller and has a perforation through which the coolant is discharged. SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel and improved roll casting+Ikt for use in an apparatus for continuous casting of strip-down gold M' in which the shell of the casting roll can be cooled substantially at low temperatures. The two immediate purposes of the casting roll cooling system are: The first is to reduce the thermal bowing of the casting roll along its axis due to the molten metal contacting the casting roll, and the second is to reduce the curvature along the thermal axis of the casting roll due to the molten metal contacting the casting roll. The objective is to remove heat almost uniformly from the metal and promote the production of high quality metal in the form of a steel tube. Warpage along the thermal axis changes the roll gap between a pair of parallel casting rolls in a roll casting machine, resulting in unacceptable thickness variations in the cooled and solidified metal. In the present invention, the shell of the casting roll is cooled substantially isothermally, so that the surface temperature of the shell of the casting roll is substantially constant. There is little or no thermal axial warpage in the roll neck or casting roll shell. Accordingly, bowing along the thermal axis of the casting orifice is significantly reduced and heat can be removed substantially uniformly from the molten metal contacting the shell of the casting roll. Conventional chill rolls have not been able to meet these demands particularly efficiently or effectively. This is because in the prior art, when the coolant circulates through the cooling device, there is a temperature change around the shell of the casting roll due to the temperature rise of the coolant, or when the coolant circulates through the cooling device, there is a temperature change around the shell of the casting roll. This is because one half 9 operates at a higher temperature than the other half 9, causing warpage along the thermal axis to develop in the neck or shell of the casting roll. In this case, during operation of the cooling system, there is both a degree change around the shell of the casting roll and a bowing along the thermal axis. + 4 + The advantage of the hot shell cooling method of the invention is that when the coolant is circulating in the cooling system, the flow rate of the coolant and the rise of the coolant by 8 degrees are not considered to be entirely determinative. is. The roll casting machine of the present invention can be generally described as comprising a pair of parallel casting rolls spaced slightly apart, the casting rolls receiving molten metal and the molten metal between the casting rolls. The molten metal is then transported to completely cool and solidify. Each casting roll includes a roll and a shell around the roll. Each casting roll has at least one axial feed hole for supplying cooling fluid into the roll and at least one axial drain hole for discharging cooling fluid from the roll. In order to flow a cooling fluid between the roll and the shell, a number of parallel ring holes are provided around the circumference of the I:I-le. A plurality of radial supply passages communicate each axial supply hole with the parallel annular groove, and n number of radial drain passages communicate each axial drain hole with the parallel annular groove. Radial here means radial from the axial supply hole or the axial drain hole, respectively, to the parallel annular groove. Each of the radial supply passage and the radial drain passage serves for at least one parallel annular groove. The radial supply passages communicate with the same annular groove on generally opposite sides with respect to the roll from the radial drain passages for the annular groove, and each radial supply passage communicates with each adjacent radial supply passage in a generally opposite direction. radially outwardly from the axial feed hole and each radial drain passage extending radially outwardly from the axial drain hole in a generally opposite direction from each adjacent radial drain passage. In this way, the cooling device of the present invention substantially cools the shell of the casting roll by 4! Can be cooled. In a preferred embodiment of the present invention, each casting roll has a radial supply passage extending along the entire length of the roll, serving for each radial feed passage and each radial drain passage and a total of two annular grooves. and two axial feed holes and two axial drain holes serving alternately for radial drain passages. In order to facilitate understanding of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. DESCRIPTION OF PREFERRED EMBODIMENTS FIG. 1 shows a casting roll 1 of a roll casting machine of the present invention.
(l Shown in front view. This project #1A (f- In carrying out,
Preferably at least one pair of casting rolls is used. The casting roll comprises a roll 12 having sleeves 14 associated with the rolls 12-1. The roll 12 has a roll neck portion located at each end. A portion of the sleeve 14 has been removed in FIG. 1 to show a portion of the roll 12. A plurality of parallel annular f#18 are provided outwardly of the roll 12. Preferably KU one roll 12 in this parallel annular groove 18
Preferably, the grooves 18 are uniformly spaced along the entire length of the grooves 18 and have substantially the same dimensions. Figures 2 and 3 are lines 2-2 and 3- of Figure 1, respectively.
FIG. 3 is a cross-sectional view taken along line 3. These cross-sectional views show axial feed holes 20a, 20b and axial drain holes 22a, which are preferably evenly spaced around the central area of roll 12.
The roll 12 is shown meeting 22b. The preferred embodiment of the casting roll of the present invention shown in these figures has two axial feed holes 20a, 20b and two axial drain holes 22a.
, 22b. However, in other embodiments of the invention, the casting roll may be provided with one or more axial feed holes and one or more axial drain holes, if appropriate. (9) In the casting roll of the present invention, it is preferable that the number of axial drain holes is equal to the number of axial supply holes. Further, it is preferable that the axial supply hole and the axial drain hole have substantially similar lengths and diameters. The radial supply passages 24a, 24b and the radial drain passages 26m, 26b' are shown in FIGS. 2 and 3. The radial supply passage and the radial drain passage each preferably have substantially similar dimensions in length and diameter. In a preferred embodiment of the invention, each radial feed passage connects two adjacent annular grooves to an axial feed hole.

and each radial drain passage connects two adjacent annular grooves to the axial drain hole. Radial supply passage 24a below in FIG.
The radial drain curved path 26a is used in adjacent annular shapes #18a and 18bK shown in FIG. The radial supply passages 24b and radial drain passages 26b shown in FIG. 3 are used in adjacent annular sections 1118c and 8d of FIG. In a preferred embodiment of the invention, each radial supply passage and each radial drain passage is used in two adjacent annular grooves, but in other embodiments of the invention, if appropriate, Each of the directional supply passages and the radial drain passages can be used in only one annular groove or in three or more adjacent annular grooves. @As shown in Figures 2 and 3, the axial supply hole 20a. 20bk are alternately assigned to use the radial supply passage, and axial drain holes 22a, 22bk are alternately assigned to the use of the radial drain passage. In this preferred embodiment of the invention, this alternating pattern of axial feed holes and axial drain holes to serve the radial feed passages and radial drain passages, respectively, spans the entire length of the roll 12. . Although not shown in the drawing. Other embodiments of the invention include, for example, the use of only one axial feed hole and one axial drain hole for the radial supply passage and the radial drain passage, respectively. , there is clearly no alternating pattern for use with radial drain passages and radial drain passages. However, in another embodiment of the invention, if more than two axial feed holes are used to feed the radial feed passages, the axial feed holes feeding the radial feed passages may be provided along the entire length of the roll. It is preferred to use alternating feed holes. And if more than two axial drain holes are used to serve the radial drain passages, it is preferred to alternate the axial drain holes serving the radial drain passages along the entire length of the roll. It is. In FIG. 2, the bottom surface of the annular groove 18b is indicated by a dotted line 28. Radial supply passage 24a and radial drain passage 26
The ring #Hsb is not visible in this cross section except for the area where the ring #18b intersects with the ring #18b. Similarly, in Figure 3, #
It is shown by the dotted line 30 on the bottom of the one-piece 1118d. The area where the radial supply passage 24b and the radial drain passage 26b intersect the annular shape 11118d by 9:0 is shown, and the annular groove 18d is not visible in this cross section. The arrows in Figures 2 and 3 indicate the flow of cooling fluid. Figure 4 is a partial plan view of a part of the roll]2 shown in Figure 1.
Contacting ring #* 18 a, ] 8 b K'7
radial supply passage 24a and adjacent annular groove 18
c. The radial drain passage 26bi used in 18d is shown. The arrows in FIG. 4 indicate the direction of flow of cooling fluid. Considering FIGS. 2, 3 and 4, it can be seen that the radial supply passages are opposite with respect to the roll 12 and the same as the radial drain passages for the two adjacent annular grooves. It is clear that it is connected to In another example embodiment of the invention. 111! 1 radial supply passages and 11 radial drain passages, regardless of whether they are used for one annular groove or two or more adjacent podium grooves. The radial supply passages communicate with the same annular groove or with the adjacent annular grooves on the opposite side with respect to the roll 12 from the radial drain passages for the annular groove or the adjacent annular grooves. As also apparent from FIGS. 2 and 3, the radial supply passages 24a and the adjacent radial supply passages 24b are located on opposite sides with respect to the roll 12, and the pupil drain passages 26a and the adjacent radial drain passages 26b are located on opposite sides of the roll 12. Haguchi=ru12
placed on the opposite side. Over the length of the roll, each radial feed passage extends radially outwardly from the axial feed hole in an opposite direction to each adjacent radial feed passage. and each radial drain passage extends radially outwardly from the axial drain hole in an opposite direction from each adjacent radial drain passage, as desired in one preferred embodiment of the present invention or any other embodiment. Ensure that isothermal cooling is achieved. 5 and 6 diagrammatically illustrate preferred flow patterns for cooling fluid through adjacent annular grooves 18m, 18b and through adjacent annular grooves 18c, 18dt. Fifth
The figure shows a block #18a adjacent to the radial supply passage 2+am,
18b and the radial drain passage 26 Jl'z+ represents the flow rL of cooling fluid from the axial supply hole 20a to the axial drain hole 22a. Figure 6 shows the radial supply passage 2.
4b, 1Iil contacting circulation groove 18c. 18d and radial drain passage 26b'ii! ! The flow of cooling fluid from the axial supply fL 20 b to the axial drain hole 22b is reduced by n. The arrow indicates the direction of cooling fluid flow. Figure 5 and #! As is clear from Figure 16, the annular groove ts
The flow direction of the cooling fluid passing through a and 18b is annular #l18
c, opposite the direction of cooling fluid flow through 18d. Massive #lJl 8a, 18b, 18c
, 18 d' represents the alternating opposing flow pattern for the cooling fluid present in the casting roll of the present invention. In a preferred embodiment of the invention, the IN, comb pattern begins at two adjacent pairs of annular grooves and continues the entire length of the roll. Accordingly, in one preferred embodiment of the casting roll of the present invention, the flow of cooling fluid through each pair of adjacent annulus #1 channels communicating with the same radial supply passage and the same radial drain passage is controlled by the flow of the cooling fluid through the adjacent radial supply A pair of adjacent annular grooves communicating with the passageway and an adjacent radial drain passageway are in opposite directions to the prevailing cooling fluid flow. This alternating, opposing flow pattern is achieved by having each radial feed passage extend radially outwardly from the axial feed hole in a direction opposite to each adjacent radial feed passage. By alternating the radial supply passages from one side of the roll to the other over the entire length, and each radial drain passage having each adjacent radial drain passage barb radially outwardly from the axial drain hole in the opposite direction. By providing alternating radial drain passages from one side of the roll to the other extending the entire length of the roll, as well as radially outward passages for two adjacent annular grooves. Directional drain passages are by communicating with the same adjacent annular grooves on opposite sides with respect to the roll. In other embodiments of the invention, one radial supply passage and one radial drain passage are formed in one annular groove or in two annular grooves.
1 or 3 or more adjacent annular grooves.
It is clear in Figure 6 that in a cast roll constructed in accordance with the principles of the present invention, alternating opposing flow patterns for the cooling fluid are present in the annular grooves over the entire length of the roll even in the oil embodiment of the present invention. It is. In another embodiment of the invention, in the case of VC, the flow of cooling fluid through one annular groove or multiple annular grooves used by the same radial supply passage and by the same radial drain passage is
In this case, the flow of cooling fluid through the adjacent annular groove or grooves used by the adjacent radial supply passage and by the adjacent radial drain passage is in an opposite direction. This alternating, opposing flow pattern provides a means for substantially uniformly removing heat from the shell of the casting roll, thereby promoting 7-El isothermal cooling of the casting roll. By alternating the radial supply passages and radial drain passages over the entire length of the roll as described above, the relatively low temperature coolant which may enter an annular groove or grooves may in some cases be placed adjacent to the workpiece 9. A relatively warm coolant circulates countercurrently in the annular groove or grooves to balance the heat conducted from the molten metal substantially uniformly along the shell of the casting roll. By balancing the heat conduction f in this manner, the temperature of the shell of the rolled roll is substantially uniform around the periphery of the shell of the roll and across the width of the roll. The balance of heat conducted through the casting rolls is determined by the present invention: radial feed passages carrying relatively low temperature inlet coolant;
radial drain passages carrying warmer delivery coolant and '(r
It is strengthened by 1 when placed on #Ia roll. A radial drain passage carrying a warmer outgoing coolant from the annular groove or grooves as the case may be and a cooler incoming coolant used in the same annular groove or grooves on opposite sides with respect to the roll. By providing radial supply passages and by providing radial supply passages alternating with radial drain passages along the length of the roll on both sides thereof, the radial direction is reduced by the cold incoming coolant flowing in the radial supply passages. 1 mm flowing into the drain passage
It can be seen that the flow of heat from the coolant delivery is approximately balanced across the roll, promoting a substantially uniform heat distribution across the roll. In a preferred embodiment of the invention, the balance of heat conducted to the casting roll is achieved by two axial feed holes and two axial drain holes serving alternately for the radial supply passage and the radial dosing passage. It is strengthened by -1- by using the entire stool. The axial supply holes and the axial drain holes are arranged in a uniform groove in the central area of the casting roll, and the axial supply holes are arranged diagonally opposite each other, and the axial drain holes are arranged diagonally opposite each other. The axial The cooler incoming coolant that flows into the directional feed holes flows into the axial drain holes substantially balancing the heat flow from the warmer outgoing coolant to provide a substantially uniform flow of heat through the casting rolls. Helps with heat distribution. Thus, the ability of the present invention to substantially uniformly balance and distribute the heat conducted from the molten metal across the casting roll provides substantially laminar cooling of the shell of the casting roll. The invention has been described in terms of preferred embodiments. It will be apparent to those skilled in the art that the present invention can be modified in various ways within the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a front view of one casting roll of a roll casting machine constructed according to the principles of the present invention with a portion of the sleeve removed. FIG. 2 is a cross-sectional view of the roll shown in FIG. 1 taken along line 2-2. FIG. 3 is a cross-sectional view of the roll shown in FIG. 1 taken along line 3-3. FIG. 4 is a partial plan view of the left part of the roll in FIG. 1, with the sleeve removed to expose the roll of the roll casting machine in FIG. 1, and shown on a larger scale than in FIGS. 1, 2, and 3. figure. 5 and 6 are diagrams showing the flow of cooling fluid into and out of adjacent pairs of annular grooves. 10...One casting roll, 12...Roll. 14...S'J-bu, 16...Roll neck FfG. 18...Annular groove. 20a, 20b... horizontal supply holes. 228.22))...Axial drain hole. 21.24h...Radial supply passage. 26g, 26b...Radial drain passage. 28.30...-1, # (bottom of annular groove). Patent Applicant Aluminum Company of America Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akiyuki Yamaguchi. FIG, I FIG, 3 FIG, 5 FIG, 6

Claims (1)

[Claims] l. In a roll casting machine for continuous casting of gold W4r in the form of stubs, a pair of parallel casting rolls slightly spaced apart receive molten metal between them, and the molten metal is This molten metal is conveyed between these rolls for cooling and solidification, each said casting roll consisting of a roll and a shell around it, said roll having at least one shaft for supplying a cooling fluid. directional feed holes, at least one axial drain hole for discharging the cooling fluid from the roll, and a plurality of parallel holes around the roll for flowing the cooling fluid between the roll and the shell. a plurality of radial supply passages that communicate each of the axial supply holes with the parallel annular groove; and a plurality of radial drain passages that communicate each of the axial drain holes with the annular groove. and each of the radial supply passage and the radial drain passage serves for at least one of the annular grooves, and the radial supply passage and the radial drain passage for the annular groove are related to the roll. It communicates with the same annular groove on almost opposite sides. Each said radial feed passage extends radially outwardly from said axial feed hole in a direction generally opposite to each adjacent radial feed passage, and each said radial drain passage extends radially outwardly from said axial feed hole in a direction generally opposite to each adjacent radial feed passage; A roll casting machine extending radially outwardly from said axial drain hole in a direction generally opposite to a passageway to effect substantially isothermal cooling of said shell. 2, serving alternately for m1 radial supply passages 2
V for the axial supply holes and the radial drain passages.
A casting roll according to claim 1, characterized in that each roll has two axial drain holes serving alternately over the entire length of the roll. 3. The two axial feed holes and the two axial drain holes are substantially disposed equidistantly spaced around a central area of the roll, and the axial feed holes are diagonal to each other. The casting roll according to claim 2g4, wherein the axial drain holes are arranged substantially opposite to each other and the axial drain holes are arranged diagonally and substantially opposite to each other. 4. Casting roll according to claim 1, characterized in that each said radial supply passage and each said radial drain passage serves two adjacent said annular grooves. 5. In a casting roll used in a roll casting machine that continuously casts gold w& in the form of a strip, the casting roll consists of a roll and a shell around the roll. The roll has at least one axial supply hole for supplying cooling fluid, at least one axial drain hole for discharging the cooling fluid from the roll, and a front self-roll and a front self-shell. a plurality of planar block grooves around the roll for flowing the cooling fluid between the rollers; aa radial feed passages communicating each of the axial feed holes with the parallel annular grooves; a plurality of radial drain passages communicating directional drain holes with the annular groove? and each forward direction serves for at least one said annular groove, said radial supply passage communicating with said same annular groove on substantially opposite sides with respect to said roll from said radial drain passage for said annular groove. and each said radial supply passage extends radially outwardly from said axial feed hole in a direction generally opposite to each adjacent radial supply passage, and each said radial drain passage extends: ? ! A casting roll extending radially outwardly from said axial drain hole in a direction generally opposite to an adjacent radial drain passage to provide substantially isothermal cooling of said shell. 6 two axial feed holes serving alternately for said radial feed passages and two axial drain holes serving alternately for the ninth semi-mechanical drain passage along the entire length of the roll; The casting roll according to claim 5, which has a roll neck. 7. said two axial feed holes and said two axial drain holes are substantially disposed equidistantly spaced around a central area of said roll, said axial feed holes being diagonally opposite each other; 7. A casting roll according to claim 6, all characterized in that they are arranged substantially oppositely and the axial drain holes are arranged substantially diagonally opposite each other. 8. The casting roll of claim 5, wherein each said radial supply passage and each said radial drain passage serves two adjacent said annular grooves.