EP0140132A1 - Verfahren zum Schleudergiessen - Google Patents

Verfahren zum Schleudergiessen Download PDF

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Publication number
EP0140132A1
EP0140132A1 EP84111163A EP84111163A EP0140132A1 EP 0140132 A1 EP0140132 A1 EP 0140132A1 EP 84111163 A EP84111163 A EP 84111163A EP 84111163 A EP84111163 A EP 84111163A EP 0140132 A1 EP0140132 A1 EP 0140132A1
Authority
EP
European Patent Office
Prior art keywords
mold
melt
stirrer
rotational speed
poured
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.)
Withdrawn
Application number
EP84111163A
Other languages
German (de)
English (en)
French (fr)
Inventor
Sten Dipl.-Ing. Kollberg
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Publication of EP0140132A1 publication Critical patent/EP0140132A1/de
Withdrawn legal-status Critical Current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
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis

Definitions

  • the present invention relates to a method for centrifugal casting according to the preamble of claim 1.
  • the molten metal is poured into a rotating mold (see Figure 1).
  • the metal first gets into a resting pool at one end of the mold.
  • the metal melt adjacent to the mold wall also begins to rotate.
  • the metal melt involved in the rotation is thrown along the mold wall in the form of a spiral in the axial direction of the mold.
  • the molten metal solidifies very quickly when it comes into the cold mold, spiral-like solidified layers, which contain segregations, pores and so on, form on top of one another.
  • the molten metal must be distributed very quickly in the longitudinal direction of the mold, preferably in the form of a coherent pool that extends in the longitudinal direction of the mold to the other end of the mold.
  • a periodically fluctuating rotational speed is expediently superimposed on the mean rotational speed, which can preferably be controlled from zero to the full value, as a result of which turbulence is generated in the liquid layer, which causes temperature compensation and thereby prevents the melt from solidifying from the inside .
  • the melt solidifies from the outside in, increasingly slowly. Bubbles occur in the casting due to gases present in the melt.
  • the spiral layer mentioned can also cause cracks in the cast pipe.
  • the invention has for its object to develop a method of the type mentioned, in which the occurrence of gases on the inner surface of the centrifugally cast tube and the risk of cracks occurring is further reduced.
  • the melt can be rotated much more quickly, so that the force which distributes the melt in the axial direction of the mold is increased.
  • this force is practically proportional to the product of the centrifugal force and the pressure head. If the centrifugal force when the melt rotates synchronously with the mold is fifty to one hundred times the gravitational acceleration g, then normal gravity can be neglected. If the melt is quickly brought into synchronous rotation with the mold by a stirrer, which can work according to the principle of the electrical asynchronous machine, the axial distribution of the melt along the mold takes place significantly faster.
  • the rotational speed of the rotating field of the stirrer is selected to be equal to the rotational speed of the mold, as a result of which eddy current losses in the mold wall are avoided.
  • FIG. 1 shows how melt (steel, iron, another metal or an alloy) is poured from a ladle 1 through a pouring spout 2 into a rotatable mold 3.
  • the mold 3 rotates at an average rotational speed (see arrow A), which is controlled as a function of time or another parameter from the start of the pouring to a suitable value during the pouring process.
  • the molten metal is expediently poured in more or less abruptly at one end of the mold, while one or more electromagnetic multiphase stirrers 5 are active, the feed of these stirrers taking place in such a phase sequence that the rotating or traveling magnetic magnets they produce Fields move in the direction of rotation of the mold.
  • the pool 6 (see FIG. 2) is distributed more quickly around the mold wall and is pressed out with a centrifugal force which corresponds, for example, to fifty times the gravitational acceleration, the melt 4 being distributed in the axial direction of the mold 3.
  • the mold 3 is preferably made of austenitic material, and the stirrer 5 can be cylindrical, part-cylindrical or straight. Several stirrers can also be used. In order to avoid eddy current losses in the mold 3, the speed of movement of the magnetic field of the stirrer 5 can be synchronized with the speed of rotation of the mold.
  • the stirrer can be supplied from a voltage source whose frequency can be set or is equal to the mains frequency.
  • the speed of rotation of the mold 3 can possibly be brought to a high value before the melt is poured in using the stirrer, the stirrer and the mold being like one Asynchronous motor work.
  • a cage winding can be arranged on the mold at the end where the stirrer is located. (Such a cage winding is not shown in the figures.)
  • Figure 3A shows a simplified representation of the relationship between the bath height h and the tube length 1 in the known method for centrifugal casting. So there is no stirrer.
  • the pouring tube begins at point S. The distribution shown applies to a specific point in time after pouring.
  • the melt rotates relatively slowly in the radial area from A to B, so that the axial force gxh A generated here is proportional, where g is the acceleration due to gravity and h A is the bath or pressure height at point 11. From the mold wall to point B, the melt has reached the rotational speed of the mold, so that the axial force in this area is approximately 50 xgxh B proportional.
  • FIG. 3B shows the corresponding relationships in the method according to the invention.
  • the melt is rotated very quickly by the stirrer, so that at point 12 the melt rotates with the mold from the mold wall to point C and generates an axial force of approximately 50 g / h.
  • the axial force corresponding to the layer entrained by friction from the mold wall is still approximately 5 oxg xh D.
  • the force of the stirrer on the melt decreases with increasing depth, since the depth of penetration of the magnetic field into the melt is limited.
  • the acceleration or deceleration that is required can also affect the inner surface of the cast pipe is stirred, made by the stirrer described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Prosthetics (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Continuous Casting (AREA)
EP84111163A 1983-09-21 1984-09-19 Verfahren zum Schleudergiessen Withdrawn EP0140132A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8305084A SE8305084L (sv) 1983-09-21 1983-09-21 Sett for centrifugalgjutning
SE8305084 1983-09-21

Publications (1)

Publication Number Publication Date
EP0140132A1 true EP0140132A1 (de) 1985-05-08

Family

ID=20352585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111163A Withdrawn EP0140132A1 (de) 1983-09-21 1984-09-19 Verfahren zum Schleudergiessen

Country Status (4)

Country Link
US (1) US4570698A (ja)
EP (1) EP0140132A1 (ja)
JP (1) JPS60152352A (ja)
SE (1) SE8305084L (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4829954A (en) * 1985-08-19 1989-05-16 Morgado Ralph G Method of forming self-sealing piston
US5222543A (en) * 1988-10-28 1993-06-29 James Hardy & Coy. Pty. Limited Microwave curing
US5784851A (en) * 1996-04-23 1998-07-28 Waugh; Tom W. Centrifugally cast pole and method
DE10244150A1 (de) * 2002-09-23 2004-04-08 Schmidt + Clemens Gmbh & Co. Kg Rohrabschnitt für eine Rohrschlange
US8567155B2 (en) 2006-07-19 2013-10-29 Tom W Waugh Centrifugally cast pole and method
JP4459948B2 (ja) 2006-12-11 2010-04-28 本田技研工業株式会社 車両用シート
CN103357838A (zh) * 2012-03-26 2013-10-23 卓然(靖江)设备制造有限公司 一种新型电磁离心铸炉管工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1059076A (fr) * 1952-04-21 1954-03-22 Metallurg Ariegeoise Et Lorrai Procédé et moule pour la coulée par centrifugation de tubes et autres pièces
DE973806C (de) * 1941-12-23 1960-06-09 Buderus Eisenwerk Verfahren zur Erzeugung von metallischen Hohlkoerpern im Schleuderverfahren
DE974478C (de) * 1943-10-15 1961-01-05 Buderus Eisenwerk Verfahren zur Erzeugung von metallischen Hohlkoerpern im Schleuderverfahren
FR2352612A1 (fr) * 1976-05-26 1977-12-23 Pont A Mousson Procede et installation pour la coulee continue par centrifugation de produits tubulaires en fonte notamment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5343624A (en) * 1976-10-01 1978-04-19 Shinko Electric Co Ltd Method of making tubular casting by utilizing rotatory electromagnetic force
LU79487A1 (fr) * 1978-04-20 1979-11-07 Arbed Methode et dispositif pour la coulee continue horizontale et la coulee continue avec lingotiere inclinee
US4240494A (en) * 1978-07-06 1980-12-23 Akubov Gleb S Method for centrifugal casting of tubular metal blanks
JPS5788355A (en) * 1980-11-21 1982-06-02 Shimadzu Corp Apparatus for x-ray analysis
FR2519567A1 (fr) * 1982-01-13 1983-07-18 Vallourec Procede de fabrication de corps creux par coulee continue a l'aide d'un champ magnetique et dispositif de mise en oeuvre du procede

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973806C (de) * 1941-12-23 1960-06-09 Buderus Eisenwerk Verfahren zur Erzeugung von metallischen Hohlkoerpern im Schleuderverfahren
DE974478C (de) * 1943-10-15 1961-01-05 Buderus Eisenwerk Verfahren zur Erzeugung von metallischen Hohlkoerpern im Schleuderverfahren
FR1059076A (fr) * 1952-04-21 1954-03-22 Metallurg Ariegeoise Et Lorrai Procédé et moule pour la coulée par centrifugation de tubes et autres pièces
FR2352612A1 (fr) * 1976-05-26 1977-12-23 Pont A Mousson Procede et installation pour la coulee continue par centrifugation de produits tubulaires en fonte notamment

Also Published As

Publication number Publication date
SE8305084D0 (sv) 1983-09-21
US4570698A (en) 1986-02-18
SE8305084L (sv) 1985-03-22
JPS60152352A (ja) 1985-08-10

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: KOLLBERG, STEN, DIPL.-ING.