EP0124792A1 - Giessdüsenanordnung - Google Patents

Giessdüsenanordnung Download PDF

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Publication number
EP0124792A1
EP0124792A1 EP84104016A EP84104016A EP0124792A1 EP 0124792 A1 EP0124792 A1 EP 0124792A1 EP 84104016 A EP84104016 A EP 84104016A EP 84104016 A EP84104016 A EP 84104016A EP 0124792 A1 EP0124792 A1 EP 0124792A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
reservoir
mounting surface
molten metal
force
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.)
Granted
Application number
EP84104016A
Other languages
English (en)
French (fr)
Other versions
EP0124792B1 (de
Inventor
Hsin L. Li
Thomas K. Morris
David B. Seal
Edward V. Limoncelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell International Inc
Original Assignee
Allied Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Allied Corp filed Critical Allied Corp
Publication of EP0124792A1 publication Critical patent/EP0124792A1/de
Application granted granted Critical
Publication of EP0124792B1 publication Critical patent/EP0124792B1/de
Expired legal-status Critical Current

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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
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles
    • 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
    • B22D11/10—Supplying or treating molten metal

Definitions

  • the invention relates to an apparatus for casting metal strip. More particularly, the invention relates to a nozzle assembly.system for mounting a casting nozzle to a crucible reservoir to cast continuous metal strip.
  • the sealing means of Smith is comprised of a tapered, frusta-conical surface on the cashing nozzle which is adapted to mate with a corresponding tapered surface along the outlet passage from the crucible.
  • the weight of the nozzle plus ths. metallostatic pressure head holds the mated, tapered surfaces together.
  • These tapered surfaces require precise machining to obtain the required degree of sealing effectiveness.
  • the closely mated surfaces do not allow for any differences in thermal expansion between the crucible and the nozzle body, particularly where the crucible and nozzle body are constructed from different refractory materials having different coefficients of thermal expansion.
  • the nozzle can expand more than the crucible outlet passage opening, and very large lateral, side to side, forces developed between the crucible and nozzle have often caused the nozzle to fracture. If the nozzle should fracture severely, the flow of molten metal is no longer restricted by the relatively small nozzle extrusion orifice; large volumes of molten metal may then escape and damage the casting surface and any nearby auxiliary support equipment.
  • the invention provides an efficient, leak resistant nozzle assembly system for casting continuous metal strip.
  • the apparatus of the invention includes a nozzle means for extruding molten metal.
  • the nozzle means has a nozzle body, a nozzle inlet opening, a nozzle exit orifice and a nozzle mounting surface located on the nozzle body proximate to the nozzle inlet.
  • a reservoir means for containing the molten metal is in fluid communication with the nozzle means.
  • the reservoir means has a reservoir opening for flowing the molten metal therethrough and has a reservoir mounting surface located proximate to the reservoir outlet.
  • the reservoir mounting surface is adapted to mate with the nozzle mounting surface and allow a relative, sliding-type movement therebetween due to a differing thermal expansion of the nozzle relative to the reservoir means.
  • Heat resistant sealing means between the nozzle mounting surface and the reservoir mounting surface minimize molten metal leakage therebetween, and a force means for resiliently urging the nozzle mounting surface toward the reservoir mounting surface mates the nozzle and
  • a method for casting continuous metal strip is contained in a reservoir means which has a reservoir mounting surface located proximate to a reservoir outlet.
  • Molten metal is extruded from a nozzle means which is in fluid communication with the reservoir means and has a nozzle mounting surface located proximate to a nozzle inlet.
  • the nozzle mounting surface and the reservoir mounting surface mate together and allow a relative, sliding-type movement therebetween due to a differing thermal expansion of the nozzle means relative to the reservoir means.
  • the region between the nozzle mounting surface and the reservoir mounting surface is sealed to minimize molten metal leakage therebetween, and the nozzle mounting surface is resiliently urged toward the reservoir mounting surface to mate the nozzle and reservoir means together.
  • the invention advantageously allows differential thermal expansion between the nozzle body and reservoir.
  • the lateral clearance avoids lateral contact between the nozzle and reservoir, and the planar mounting surfaces allow an amount of relative movement along the mated, parallel mounting surfaces to avoid the build up of excessive lateral stresses that could fracture the nozzle or crucible.
  • the force means which resiliently urges the nozzle and reservoir means together, allows a lengthwise, longitudinal thermal expansion of the nozzle without a buildup of excessive internal stresses.
  • the safety device prevents a sudden escape of excessive amounts of molten metal if the nozzle should become inadvertently fractured.
  • the present invention more reliably and more efficiently casts continuous metal strip.
  • the invention minimizes nozzle fracturing due to thermal stresses developed between the nozzle and the reservoir means and minimizes the escape of molten metal from the reservoir if the nozzle should become inadvertently fractured.
  • the present invention is suitable for casting continuous strip of crystalline or amorphous metal. While the preferred embodiments are described with respect to casting amorphous metal alloy strip, it is readily apparent that the invention can be easily adapted to cast crystalline metal strip as well.
  • a “strip” is a slender body in which the transverse dimensions are much smaller than the length.
  • a strip includes wire, ribbon and sheet of regular or irregular cross-section.
  • FIG. 1 shows a typical prior art apparatus for the continuous casting of metal strip to point out the general use of the present invention.
  • Molten alloy contained in crucible 101 is heated with a heating element 4.
  • Pressurization of the crucible with an inert gas extrudes a stream of molten metal from nozzle 102, located at the base of the crucible, onto quench surface 5 of rotating quench wheel 6.
  • the solidified moving strip 8 after its break-away point from the quench wheel is routed onto a winding wheel (not shown).
  • the extruded metal is quenched at an extremely rapid rate of at least about 10 4 °C/sec, and the solidified strip moves rapidly off the quench wheel at a speed ranging from about 400-2200 m/min.
  • the cast strip is quite thin, typically about 25-100 microns thick, but considerable selectivity may be exercised with respect to the width and cross-section.
  • FIG. 2 shows a representative nozzle assembly for casting continuous metal strip in which a nozzle means for extruding molten metal is shown generally at 2.
  • the nozzle has a nozzle body 12, a nozzle inlet opening shown generally at 14, a nozzle exit orifice 16 and a nozzle mounting surface, such as substantially planar surface 24.
  • a reservoir means, comprised of crucible 1, contains molten metal and includes a reservoir outlet opening, shown generally at 10, for flowing the molten metal therethrough.
  • a reservoir mounting surface, such as substantially planar surface 22, is located on the reservoir means proximate to the reservoir outlet.
  • Reservoir surface 22 is adapted to mate with nozzle surface 24 and allow a relative, sliding-type movement therebetween due to a differing thermal expansion of nozzle 2 relative to crucible 1.
  • the reservoir crucible is adapted to provide a lateral clearance distance 3 between nozzle 2 and crucible 1. The lateral clearance prevents lateral contact caused by a differing thermal expansion of nozzle 2 relative to crucible 1.
  • a safety device is comprised of a cover member 26 having a constricted passage 28 therethrough. Cover 26 has a peripheral, outwardly extending cover flange 29 adapted to mount at the inlet portion 14 of nozzle 2 to limit the flow of molten metal from crucible 1 into the nozzle.
  • a resilient, heat resistant sealing means such as a boron nitride paste adhesive 21, is interposed between nozzle mounting surface 24 and crucible mounting surface 22 to minimize molten metal leakage therebetween.
  • Force means 30 resiliently urges the nozzle mounting surface toward the crucible mounting surface to mate the nozzle and crucible together.
  • the apparatus of the invention advantageously minimizes any stresses caused by differing amounts of thermal expansion between nozzle 2 and crucible 1.
  • lateral clearance 3 avoids lateral contact between the nozzle and crucible, and the planar mounting surfaces 22 and 24, disposed substantially parallel to each other, allows relatively free, sliding-type movement between the nozzle and the crucible. Surface shear stresses are present, but bulk stresses that could crack and break the nozzle are minimized.
  • the resilient force means allows longitudinal thermal expansion while mating and holding together nozzle 2 and crucible 1 with a force sufficient to prevent molten metal leakage therebetween.
  • the nozzle assembly illustrated in FIG. 2 is an internally mounted nozzle.
  • the reservoir mounting surface is an inwardly facing surface 22 of crucible 1
  • the nozzle mounting surface is a nozzle body surface 24 facing in the direction of the intended flow of molten metal.
  • nozzle mounting surface 24 is located on a surface of a nozzle flange 15 which extends radially outward along a peripheral edge of nozzle body 12.
  • force means 30 can be comprised of a distinct mechanical mechanism, the force means in this embodiment is preferably provided by the weight of nozzle 2 and cover 26 along with the metallostatic pressure head of any molten metal contained in crucible 1.
  • FIG. 3 shows an externally mounted nozzle which compared to the internally mounted nozzle is more easily removed and serviced, particularly when there is molten metal in crucible 1.
  • a stopper rod 66 can be employed to block passage 28 while the nozzle is being preheated or serviced.
  • the reservoir mounting surface is an outwardly facing surface 25 of crucible 1
  • the nozzle mounting surface is a nozzle body surface 20 facing opposite to the direction of the intended flow of molten metal.
  • nozzle mounting surface 23 is located on a surface of nozzle flange 15 to increase the mated surface area between the nozzle and crucible.
  • the sealing means for the externally mounted nozzle is preferably comprised of a gasket composed of a ceramic fiber, such as alumina silica.
  • the externally mounted nozzle advantageously eliminates the need for a separate cover for the safety device.
  • the cover member of the safety device is comprised of the bottom wall 64 of crucible 1, and constricted outlet passage 28 which communicates through bottom wall 64 limits the flow of molten metal from crucible 1.
  • the externally mounted nozzle does require a force means 30 comprised of a distinct mechanical mechanism 33 to hold the nozzle and crucible together and maintain alignment therebetween.
  • FIG. 4 shows an embodiment of the invention which employs an optional nozzle heater means 18 disposed about nozzle 2 to preheat the nozzle and maintain the temperature of the molten metal as it passes therethrough.
  • FIG. 4 further shows a force means comprised of springs.
  • a support member such as frame 32
  • a displacement member such as plate 34
  • Spring means such as compressible springs 36
  • Springs 36 provide a selected force which is adapted to move plate 35 toward nozzle 2 and resiliently urge the nozzle mounting surface 23 toward crucible mounting surface 25.
  • Adjustment means comprised of threaded studs 38, nuts 42 and washers ,40, adjust springs 36 to provide a selected spring force.
  • threaded studs 38 are attached to frame 32 by suitable attachment means, such as welding.
  • the studs extend through holes in plate 34 and are adapted to slide freely through those holes.
  • frame 32 has openings which allow nozzle 2 and heater 18 to extend therethrough without interference from the frame. There is sufficient clearance between nozzle 2 and frame 32 to eliminate any lateral, side to side contact therebetween due to thermal expansion of the nozzle.
  • Plate 34 is adapted to operably contact nozzle heater 18 and move nozzle 2 toward crucible 1.
  • Plate 34 also has an opening 61 therethrough which is configured to allow extrusion of molten metal from nozzle 2 onto a suitable quench surface.
  • a spring 36 and a washer 40 are assembled about each stud 38.
  • Each spring is interposed between a washer 40 and the frame 32, and a nut 42 is then threaded onto each stud 38.
  • plate 34 is drawn up against heater 18, which contacts nozzle 2 to urge the nozzle mating surface 23 toward crucible surface 25 and hold the nozzle and crucible together.
  • the resilience of the springs also allows longitudinal movement of plate 32 along studs 38 in response to the thermal expansion of nozzle 2 and heater 18, and prevents the buildup of excessive stresses within the nozzle.
  • the ambient high temperatures which can exceed 1,000°C, can cause a relaxation of the force exerted by springs 36.
  • the force between nozzle 2 and crucible 1 may become too low to maintain an adequate seal therebetween, and leakage of molten metal may occur.
  • the force means is preferably comprised of a pneumatic actuator mechanism as shown in Figures 5 and 6.
  • a pneumatic actuator 46 operated by a pressurized fluid, such as compressed gas one can advantageously monitor and continuously adjust the gas pressure in the actuator to provide a substantially constant force that operates to hold nozzle 2 and crucible 1 together and maintains an adequate seal therebetween.
  • support frame 32 is substantially immobile with respect to crucible 1 and has openings configured to accommodate placement of nozzle 2 and heater 18 therethrough without interference from the frame.
  • a displacement member is comprised of lever arms 54, a cross member 52 connected between two end portions of the lever arms and a pivot plate 35. The displacement member is movable relative to frame 32.
  • pivot means comprised of pivot brackets 52 and pivot bearings 56, connect to support frame 32 and are adapted to pivot the displacement means thereabout.
  • Pivot brackets 52 are rigidly connected to support frame 32 by suitable fasteners or by welding and are adapted to support pivot bearings 56.
  • Pivot bearings 56 pivotably connect each lever arm 54 to its respective pivot bracket 52.
  • a neumatic actuator means such as a dual action pneumatic actuator 46, is adapted to pivot the displacement member about the pivot means to move a portion of the displacement member, particularly plate 35, toward nozzle 2.
  • Actuator 46 further provides a selected force that resiliently urges the nozzle mounting surface 23 toward mounting surface 25 of the crucible reservoir to mate and hold the nozzle and crucible together.
  • actuator brackets 50 are rigidly connected to frame 32 and adapted to support actuator 46.
  • Actuator 46 operably connects to cross member 62 an-I when operated, provides a force that moves cross member 62 downwards to pivot lever arms 54 about pivot pins 56. As the lever arms rotate, they move plate 35 upward against nozzle heater 18 which in turn, contacts nozzle 2. The preselected force provided by.actuator 46 urges surface 23 toward surface 25 to mate the nozzle end crucible together.
  • Pressure regulator means 48 controls the gas pressure supplied to actuator 46 to adjust the force directed against heater 18 and nozzle 2.
  • the regulated gas pressure in actuator 46 provides a resiliency which allows thermal expansion of nozzle 2 and downward movement of plate 35 while still maintaining a constant, stable force between nozzle 2 and crucible 1 that is sufficient to preserve the liquid seal therebetween. As a result, leakage is minimized and excessive thermal stresses that could fracture the nozzle are avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP84104016A 1983-05-04 1984-04-11 Giessdüsenanordnung Expired EP0124792B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49147183A 1983-05-04 1983-05-04
US491471 1983-05-04

Publications (2)

Publication Number Publication Date
EP0124792A1 true EP0124792A1 (de) 1984-11-14
EP0124792B1 EP0124792B1 (de) 1987-01-28

Family

ID=23952375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104016A Expired EP0124792B1 (de) 1983-05-04 1984-04-11 Giessdüsenanordnung

Country Status (5)

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EP (1) EP0124792B1 (de)
JP (1) JPS59209464A (de)
KR (1) KR900002121B1 (de)
CA (1) CA1217023A (de)
DE (1) DE3462226D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116851673A (zh) * 2023-07-21 2023-10-10 辽宁同新新材料科技有限公司 一种非晶制带机中的喷嘴调整方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0745089B2 (ja) * 1987-03-30 1995-05-17 石川島播磨重工業株式会社 双ロ−ル式連鋳機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2367568A1 (fr) * 1976-10-14 1978-05-12 Daussan & Co Dispositif de prechauffage pour repartiteurs de coulee a obturateurs
US4270595A (en) * 1978-09-08 1981-06-02 Georgetown Steel Corporation Shroud with replaceable extension

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154380A (en) * 1977-08-01 1979-05-15 Allied Chemical Corporation Externally replaceable metal casting nozzle
JPS56136261A (en) * 1980-03-26 1981-10-24 Kawasaki Steel Corp Broad slit nozzle for production of quick-cooled thin metal strip
JPS57106749U (de) * 1980-12-22 1982-07-01

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2367568A1 (fr) * 1976-10-14 1978-05-12 Daussan & Co Dispositif de prechauffage pour repartiteurs de coulee a obturateurs
US4270595A (en) * 1978-09-08 1981-06-02 Georgetown Steel Corporation Shroud with replaceable extension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116851673A (zh) * 2023-07-21 2023-10-10 辽宁同新新材料科技有限公司 一种非晶制带机中的喷嘴调整方法
CN116851673B (zh) * 2023-07-21 2024-02-02 辽宁同新新材料科技有限公司 一种非晶制带机中的喷嘴调整方法

Also Published As

Publication number Publication date
EP0124792B1 (de) 1987-01-28
KR900002121B1 (ko) 1990-04-02
JPS59209464A (ja) 1984-11-28
JPS6320626B2 (de) 1988-04-28
DE3462226D1 (en) 1987-03-05
KR840009230A (ko) 1984-12-26
CA1217023A (en) 1987-01-27

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