US3920064A - Mandrel for continuous casting of hollow ingots - Google Patents

Mandrel for continuous casting of hollow ingots Download PDF

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Publication number
US3920064A
US3920064A US358363A US35836373A US3920064A US 3920064 A US3920064 A US 3920064A US 358363 A US358363 A US 358363A US 35836373 A US35836373 A US 35836373A US 3920064 A US3920064 A US 3920064A
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US
United States
Prior art keywords
mandrel
coating
thickness
tapered section
ingot
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
US358363A
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English (en)
Inventor
Vitaly Yakovlevich Genkin
Vladimir Borisovich Gankin
Alexandr Georgievich Budkevich
Vladimir Efremovich Sirota
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Individual
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Individual
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Publication date
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Priority to US358363A priority Critical patent/US3920064A/en
Priority to GB2605173A priority patent/GB1404903A/en
Priority to FR7321293A priority patent/FR2233119B1/fr
Application granted granted Critical
Publication of US3920064A publication Critical patent/US3920064A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes

Definitions

  • the present invention relates to metallurgy and, more particularly, to the continuous casting of metals and alloys and may prove useful in casting hollow ingots.
  • an ingot space is shaped with the help of an internal mould (a mandrel). Between the walls of the external mould and mandrel there is provided an annular space wherein liquid metal is admitted. On freezing solid it forms a hollow metal blank.
  • each underlying step is chosen so that it will be slightly less that the preceding one with the step length being selected in such a manner that the skin shall fit the mandrel in the top section of each step, setting off from the mandrel as it descends. This is made to enable a periodic decrease in heat removal and to reduce the stresses arising in the skin.
  • a disadvantage of the parabolic or multistep tapered mandrels resides in a rapid drop in temperature of the primary ingot skin at the first instant when liquid metal comes in contact with the mandrel and in a maximum shrinkage rate which takes place at this moment.
  • the skin sets off from the mandrel.
  • the rate of the building-up of the skin reduces sharply and variations in its thickness become manifest which may lead subsequently to distortion of the internal space and on some occasions to melting-off and to the bleeding of the liquid core into the ingot space.
  • friction between the internal skin of the ingot and the mandrel arising when the skin is pulled off the mandrel results in the origination of the skin stresses and, may leadto tears or to the hanging of the skin on the mandrel.
  • the object of the present invention is to provide a mandrel for the continuous casting of hollow ingots whose inherent design would offer a reduction in the rate of heat removal from an internal skin of the hollow ingot, being formed, at the first instant of solidification .(near the meniscus) and in the coefficient of friction between the ingot skin and mandrel.
  • the above object is accomplished by providing a mandrel for the continuous casting of downwardly conveyed hollow ingots having a downwardly tapered section in the zone of contact with liquid metal, wherein, according to the invention, the tapered section of the mandrel is given a coating of a metal whose coefficient of thermal conductivity is lower than that of the metal from which the mandrel is manufactured, with the coating decreasing uniformly in thickness along the lengthof the tapered; section the mandrel in the direction of motion of'the ingot with the ratio .of the thick ness of the coating at the upper end of the tapered sectionrelative to the thickness of the coating atthe lower end thereof ranging from 1:50 to 1:150.
  • the inherent design of the mandrel 2 would offer a reduction in the rate of heat removal and shrinkage rate of the internal skin of the ingot, enabling the friction between the internal skin and mandrel to be reduced in the course of solidification.
  • the tapered section of a mandrel 2 made from copper is given a diffusion chrome or molybdenum coating 3.
  • the coating is applied in such a way that its thickness diminishes uniformly downwardly along the length of the mandrel in the direction of motion of the ingot from a thickness T at the upper end of the tapered section to a thickness T at the lower end thereof.
  • the ratio of limit thicknesses of the coating at the relative tapered section ends varies over a range of 1:50-1:150.
  • the thickness of the mandrel coating amounts to 1 mm at the beginning or upper end of the tapered section, its thickness should range within from 20 to 7 mm at the lower end of the section.
  • the herein-disclosed device operates in the following manner.
  • An internal mould a mandrel 2 is installed in a continuous casting machine of a vertical type so that it is aligned axially with an external mould l.
  • the working part of the mandrel has a tapered section to which the above-described coating 3 is applied.
  • heat transfer from the internal skin to the mandrel shall be increased when the ingot is pulled off the mandrel, for which purpose the mandrel coating must decrease uni formly in thickness toward the end of the working part of the mandrel.
  • the use of the thus-made mandrel would offer a reduction in the rate of shrinkage of the primary internal skin of the ingot being shaped and would make it possible to increase the duration of contact between said ingot skin and the heat-absorbing-surface of the mandrel.
  • the presence of the coating on the man-' drel surface descreases the coefficient of friction between the internal ingot skin and mandrel by means of which a smaller force is needed to pull the ingot off the mandrel while decreasing the probability of the skin adhering to the mandrel.
  • a mandrel for the continuous casting of ,downwardly conveyed hollow ingots comprising a downwardly tapered section located in thezone of contact with liquid metal and having a coating of a metal provided on the tapered section whose coefficient of thermal conductivity is lower than that of the metal from which said mandrel is manufactured, with the thickness 3 4 of said coating diminishing uniformly from the upper the coating at the upper end of the tapered section relaend of the tapered section along the length of the mantive to the thickness of the coating at the lower end drel to the lower end thereof in the direction of downthereof ranging from 1:50 to 1:150.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
US358363A 1973-05-08 1973-05-08 Mandrel for continuous casting of hollow ingots Expired - Lifetime US3920064A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US358363A US3920064A (en) 1973-05-08 1973-05-08 Mandrel for continuous casting of hollow ingots
GB2605173A GB1404903A (en) 1973-05-08 1973-05-31 Mandrel for continuous casting of hollow ingots
FR7321293A FR2233119B1 (enrdf_load_stackoverflow) 1973-05-08 1973-06-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US358363A US3920064A (en) 1973-05-08 1973-05-08 Mandrel for continuous casting of hollow ingots

Publications (1)

Publication Number Publication Date
US3920064A true US3920064A (en) 1975-11-18

Family

ID=23409364

Family Applications (1)

Application Number Title Priority Date Filing Date
US358363A Expired - Lifetime US3920064A (en) 1973-05-08 1973-05-08 Mandrel for continuous casting of hollow ingots

Country Status (3)

Country Link
US (1) US3920064A (enrdf_load_stackoverflow)
FR (1) FR2233119B1 (enrdf_load_stackoverflow)
GB (1) GB1404903A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2382296A1 (fr) * 1977-03-03 1978-09-29 N Proizv Obied Tulachermet Noyau pour la coulee de demi-produits creux
US5012853A (en) * 1988-09-20 1991-05-07 Sundstrand Corporation Process for making articles with smooth complex internal geometries

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022552A (en) * 1959-08-24 1962-02-27 Alfred H Tessmann Continuous casting apparatus
US3302251A (en) * 1962-10-18 1967-02-07 Mannesmann Ag Molybdenum lined mold for continuous casting
US3409068A (en) * 1965-07-01 1968-11-05 Phelps Dodge Copper Prod Method of continuously casting tubes using a rotating mandrel
US3416591A (en) * 1963-03-27 1968-12-17 Civile Soc Civile D Etudes De Process for effecting the continuous rotary casting of hollow steel blanks

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3022552A (en) * 1959-08-24 1962-02-27 Alfred H Tessmann Continuous casting apparatus
US3302251A (en) * 1962-10-18 1967-02-07 Mannesmann Ag Molybdenum lined mold for continuous casting
US3416591A (en) * 1963-03-27 1968-12-17 Civile Soc Civile D Etudes De Process for effecting the continuous rotary casting of hollow steel blanks
US3409068A (en) * 1965-07-01 1968-11-05 Phelps Dodge Copper Prod Method of continuously casting tubes using a rotating mandrel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2382296A1 (fr) * 1977-03-03 1978-09-29 N Proizv Obied Tulachermet Noyau pour la coulee de demi-produits creux
US5012853A (en) * 1988-09-20 1991-05-07 Sundstrand Corporation Process for making articles with smooth complex internal geometries

Also Published As

Publication number Publication date
FR2233119B1 (enrdf_load_stackoverflow) 1976-04-23
FR2233119A1 (enrdf_load_stackoverflow) 1975-01-10
GB1404903A (en) 1975-09-03

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