US3901473A - Apparatus and method for casting composite cast rolls - Google Patents

Apparatus and method for casting composite cast rolls Download PDF

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Publication number
US3901473A
US3901473A US460454A US46045474A US3901473A US 3901473 A US3901473 A US 3901473A US 460454 A US460454 A US 460454A US 46045474 A US46045474 A US 46045474A US 3901473 A US3901473 A US 3901473A
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US
United States
Prior art keywords
mold
discharge
shell material
syphon
shell
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 - Lifetime
Application number
US460454A
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English (en)
Inventor
Heinz Dieter Braukmann
Wolfgang Hattwig
Manfred Wichert
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.)
Rheinstahl Giesserei AG
Original Assignee
Rheinstahl Giesserei AG
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 Rheinstahl Giesserei AG filed Critical Rheinstahl Giesserei AG
Application granted granted Critical
Publication of US3901473A publication Critical patent/US3901473A/en
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Expired - Lifetime 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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills

Definitions

  • the shell material is directed into the mold through the filling funnel and bottom inflow passage to flow upwardly in the mold to the level of the top of the shell portion of the article to be cast, after the bottom valve is closed to close off the discharge.
  • the shell material is permitted to harden to a certain thickness and the bottom discharge valve is opened to drain the shell material and the core material is poured into the mold from the top opening.
  • means in the form of a siphon are provided for controlling the outflow rate of the material through the bottom discharge.
  • the siphon comprises a connecting conduit connected to the bottom discharge and having an upwardly extending bend which is made up of a plurality ofinterfitted parts so that the height thereof may be varied.
  • the top of the syphon bend is arranged at a predetermined distance from the top of the mold, and the outlet for the syphon is controlled so as to regulate the amount of material which is directed out through the discharge during the pouring of the core material.
  • a casting mold construction which includes a lower box forming the mold for the lower roll neck, a permanent mold for the roll above the lower roll neck and a top mold part over the permanent mold which is provided for forming the upper roll neck.
  • the mold is connected by a pouring tubeor funnel having a top funnel opening above -the top of the mold and leading downwardly into a tangential inflow passage in the lower box which is provided for the lower roll neck.
  • the bottom of the box is also provided with a discharge passage having aslide valve therein which may be regulated for opening and closing the-discharge.
  • the discharge is opened after the solidification of a predetermined thickness of the shell material in the mold in order to drain the central portion of the shell material into a ladle by flow through the bottom discharge. Thereafter, the core material is filled in through the funnel pipe.
  • the present invention eliminates the drawbacks of the known devices and methods and provides a method and apparatus suitable even for the casting of rolls of extreme dimensions, particularly rolls for plate rolling.
  • the invention provides an apparatus and method in which the shell material which remains liquid after a certain thickness has formed is drained through a slide valve located in a bottom discharge passage at the bottom of the mold and passes into a foundry ladle.
  • the slide valve is connected to a syphon having an outlet with a variable cross-section so that the discharge rate may be varied therethrough.
  • the draining of the shell material in excess is avoided and, in accordance with theinvention, the core material is continuously poured from above through a top opening in the mold directly on the sinking surface of the shell material, so that nearly no mixing at all takes place in-the contact zone between the two materials.
  • the drained shell material' is recovered in a liquid state in the ladle placed below the syphon, and
  • the height of thesyphon is adapted to the length of the rolls or the height of the casting rnold;
  • the syphon is made up of a plurality of interconnectable elements which are interchangeable so that elements of various lengths may be selected to fix the distance between the top of the casting mold andthe top of the syphon tube.
  • rolls of any length may be cast in an apparatus which may be adjusted to maintain constant pressure conditions during the draining of the shell material'and the inflowing of the core material.
  • an additional slide valve is provided after the first slide valve to ensure that the mold i can be closed after the draining of the shell material.
  • the height of the mold may,
  • a further object of the invention is to provide an apparatus for casting composite articles which is simple in design, rugged in construction and economical to manufacture.
  • FIGURE of the drawing is a diagrammatic vertical sectional view of a composite roll casting apparatus constructed in accordance with the invention.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT pipe 5 has a top funnel portion 5a above the top of the open mold and it connects into a tangential filling passage adjacent the bottom of the lower portion 3.
  • a drain brick forming a discharge passage which is lined with refractory material.
  • the discharge passage is provided with a continuation in which there is a slide valve 11, which is also lined with refractory material, and which is actuated by afluid pressure operated piston and cylinder combination 11a.
  • means are provided to control the outflow of the shell material and, in the embodiment shown, this comprises a syphon, generally designated 12, which includes an upper bend portion 12a having a discharge side which terminates in an outflow passage 13 of a refractory brick material which has a preselected crosssection depending upon the size of the roll to be cast.
  • the discharge passage 13 provides a simply connectable means for regulating the discharge opening, but
  • the whole syphon 12 may, of course, be selected witha reduced cross-section or a cross-section sized in accordance with the desired flow conditions.
  • a feature of the syphon construction is that it may be made up of a plurality of interconnected parts which are interchangeable and which may be of a length such that a preselected distance 15 is maintained between the top of the bend portion 12a and the top of the casting mold. When the mold is changed in size, the distance 15 may be changed by changing the length of the interconnectable parts of the syphon 12.
  • a foundry ladle 14 is placed below the discharge 13 of syphon 12 for collecting the shell material which is drained from the mold after the outer portion thereof solidifies in the mold.
  • a pouring ladle 16 is shown above the open top 54 of the mold, and'it may be tilted to continuously pour the core material into the top 54.
  • the shell material is first delivered into the interior of the casting mold through the bottom inlet passage by pouring a quantity thereof into filling funnel 55.
  • the shell material is permitted to flow upwardly into the top of the mold to the distance of the termination of the outer shell layer and the outer shell layer is permitted to solidify.
  • the inner portion of the shell material, while still liquid, is drained from the casting mold by opening the discharge valve 11 and the outflow rate is regulated by the syphon 12 in order to ensure an even and uniform withdrawal.
  • the core material is poured from ladle 16 onto the top of the receiving surface of the shell material, and the core material is continuously filled in from above on the sinking surface 17 while the shell material is directed through syphon 12.
  • the contact surface 17 between the two materials remains completely quiet.
  • An apparatus for casting composite rolls comprising a vertically elongated mold having an open top for the inpouring of core material and a lower inflow passage for shell material, a shell material filling funnel connected to said inflow passage for the delivery of shell material thereto, means defining a bottom discharge passage at the bottom of said mold having a regwith parts of distinct sizes in order to regulate the top of the syphon in respect to the top of the casting roll.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US460454A 1973-04-16 1974-04-12 Apparatus and method for casting composite cast rolls Expired - Lifetime US3901473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2319208A DE2319208C3 (de) 1973-04-16 1973-04-16 Einrichtung und Verfahren zum Gießen von Verbundgußwalzen

Publications (1)

Publication Number Publication Date
US3901473A true US3901473A (en) 1975-08-26

Family

ID=5878280

Family Applications (1)

Application Number Title Priority Date Filing Date
US460454A Expired - Lifetime US3901473A (en) 1973-04-16 1974-04-12 Apparatus and method for casting composite cast rolls

Country Status (10)

Country Link
US (1) US3901473A (de)
AT (1) AT328636B (de)
BE (1) BE811157A (de)
CA (1) CA1007033A (de)
DE (1) DE2319208C3 (de)
ES (1) ES423521A1 (de)
FR (1) FR2225238B1 (de)
GB (1) GB1447170A (de)
IT (1) IT1010674B (de)
SE (1) SE409831B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434125A (en) 1982-03-12 1984-02-28 Smith International, Inc. Method for securing a wear sleeve about a drill pipe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063815A (en) * 1935-12-18 1936-12-08 Continental Roll & Steel Found Roll and method of making the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063815A (en) * 1935-12-18 1936-12-08 Continental Roll & Steel Found Roll and method of making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434125A (en) 1982-03-12 1984-02-28 Smith International, Inc. Method for securing a wear sleeve about a drill pipe

Also Published As

Publication number Publication date
AT328636B (de) 1976-03-25
SE409831B (sv) 1979-09-10
FR2225238B1 (de) 1978-11-10
BE811157A (fr) 1974-06-17
DE2319208B2 (de) 1975-04-03
ATA296074A (de) 1975-06-15
ES423521A1 (es) 1976-05-16
DE2319208A1 (de) 1974-10-24
IT1010674B (it) 1977-01-20
FR2225238A1 (de) 1974-11-08
DE2319208C3 (de) 1975-11-13
CA1007033A (en) 1977-03-22
GB1447170A (en) 1976-08-25

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