EP0302540A1 - Procédé d'inoculation de la fonte - Google Patents

Procédé d'inoculation de la fonte Download PDF

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Publication number
EP0302540A1
EP0302540A1 EP88201362A EP88201362A EP0302540A1 EP 0302540 A1 EP0302540 A1 EP 0302540A1 EP 88201362 A EP88201362 A EP 88201362A EP 88201362 A EP88201362 A EP 88201362A EP 0302540 A1 EP0302540 A1 EP 0302540A1
Authority
EP
European Patent Office
Prior art keywords
der
des
inoculant
wird
mold
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
EP88201362A
Other languages
German (de)
English (en)
Other versions
EP0302540B1 (fr
Inventor
Heiner Dr. Iräger
Karl-Heinz Dr. Kleemann
Karl Josef Reifferscheid
Dieter H. Gumbinger
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.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg AG
Metallgesellschaft 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 SKW Trostberg AG, Metallgesellschaft AG filed Critical SKW Trostberg AG
Publication of EP0302540A1 publication Critical patent/EP0302540A1/fr
Application granted granted Critical
Publication of EP0302540B1 publication Critical patent/EP0302540B1/fr
Anticipated expiration legal-status Critical
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
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/007—Treatment of the fused masses in the supply runners
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron

Definitions

  • the invention relates to a method for inoculating cast iron according to the preamble of patent claim 1.
  • DE-OS-19 36 153 discloses a process for the production of spheroidal graphite cast iron in the mold.
  • the device used in the known method consists of a horizontally running pouring channel, which is followed by a rectangular chamber which is set downwards.
  • the chamber is equipped with vertically running partitions which are arranged at a distance from one another and form a passage opening. The partitions ensure that the cast iron shooting into the chamber mixes well with the inoculant so as to form a large contact area between cast iron and the inoculant.
  • FR-PS-2 034 907 a method and a device for treating molten metal is known, which is provided with a vertically running inlet part, an adjoining, horizontally running, one-part pouring channel, which extends with a cross section of the pouring channel, the reaction chamber receiving the vaccine is provided.
  • inoculation for the melt and / or in the space to be filled by the melt contains inoculant granules and / or alloy-containing bodies which can be dissolved by the melt .
  • the body is made from foam polystyrene enriched with inoculants.
  • Another method known from DE-AS-12 48 239 for inoculating cast iron is that the cast iron melt is brought into contact with an inoculant molded into it when it flows through the sprue or gate system.
  • the inoculant can be used in the form of a shaped body or a piece of pipe.
  • the invention has for its object to provide a method for inoculating cast iron melts, in which the cast iron melt removes sufficient amounts of inoculant largely without turbulence and in a flow that is as laminar as possible.
  • the object of the method according to the invention is to that the molded body is supported at both ends in opposite recesses (core marks) of the wall of the sprue or gate system.
  • the recesses or core marks are advantageously adapted to the shape of the inoculant body in such a way that there is a kind of full bearing shell for the ends of the inoculant body to be inserted. In this way, practically no melt can penetrate the joint between the mold and the vaccine body.
  • the bearing-like recesses for the inoculant body provided in the wall expediently lie in the parting plane of the molding box.
  • the shape can be cut vertically or horizontally.
  • the new type of storage according to the method of the invention requires a vaccine body, the longitudinal axis of which is longer than the transverse axis.
  • solid rods of round or angular cross-section are suitable as shaped bodies, whereby these rods can expediently also have elliptical or spherical thickenings in the middle.
  • the vaccine body can have the shape of a narrow cone.
  • Vaccine bodies in the form of a double cone or a double pyramid are particularly suitable.
  • an adaptation of the shape in the sprue part to the shape of the inoculant body is expedient, so that a streamlined flow of the cast iron melt is brought about.
  • the formation of a build-up of the cast iron melt is provided in the area of the inoculant body, so that it lies and reacts, so to speak, in the melt standing in the gate.
  • the circular cross section of the pouring channel is narrowed to a slit-shaped cross section immediately below the inoculant body, which in turn subsequently widens to the original circular cross section.
  • the method of the invention has advantages.
  • the vaccine body the metal melt flows practically completely around it and only a relatively small part of the respective ends is supported in the wall and covered by ceramic material. Due to the bilateral storage, the bearing shell can also be smaller. As a result, more surface area of the vaccine is available per unit weight of flowing melt.
  • the outer surface of the vaccine body in the core brand does not have to be pressed.
  • the double-sided mounting provides reliable protection of the body against breakout, since no torque effect can occur, which is caused by the flow pressure of the cast iron melt.
  • the vaccination method of the invention can be applied to the molding mask method with particular advantage because the bearing shells can be molded well into the relatively thin walls of the (half) masks and, moreover, the vaccine bodies need only be inserted loosely into the core brands of the pressure-sensitive masks and do not need to be pressed in , thereby avoiding unnecessary rejects due to destruction.
  • Spheroidal graphite cast iron crankshafts having a composition of 3.75% C, 0.32% Mn, 0.6% Cu, 2.1% Si, 0.009% S and 0.042% Mg were cast into a vertically split mold.
  • the usual so-called post-inoculation was carried out in the sprue funnel of the mold using a truncated cone-shaped inoculant body with the composition 75% Si, 0.6% Ca, 1.8% Al, rest Fe at a casting temperature of 1395 ° C.
  • the casting weight including feeder and sprue system was 56 kg, the vaccine body weighed 63 g.
  • the inoculant body was inserted into a core mark in the sprue funnel at about 1/3 of its height and fixed.
  • the gate was covered with a 2.5 mm thick sheet of iron so that the delay required to fill the sprue funnel and activate the inoculum body occurred.
  • the filling time of the mold was 11 seconds.
  • the metallurgical result of the inoculation was determined on polished specimens (from the so-called journal of the shaft), the following sizes of the graphite balls in the predominantly pearlitic basic structure being determined: structure Spherolites per mm2 Size distribution ⁇ in ⁇ m 60-80 40-60 20-40 ⁇ 20 up to approx. 3% cementite 2.9% 2.9% 20.4% 73.8% approx. 15% ferrite 205 Remainder pearlite
  • Crankshafts made of spheroidal graphite cast iron with the composition 3.75% C, 0.32% Mn, 0.6% Cu, 2.1% Si, 0.009% S and 0.042% Mg were again in a vertically divided form at 1395 ° C. shed.
  • a vaccine body of the composition according to Example 1 was used for the subsequent vaccination.
  • recesses in the manner of a core mark were made in the wall of the sprue at a small distance below the sprue funnel intended.
  • the body of the inoculant was stored in the form of a truncated cone or a double truncated cone (see FIGS. 1 and 2) with its two ends in the form of cones in these recesses.
  • the two body sections stored in the opposite recesses each had a length of about 1/8 of the total body length. Underneath the inoculant body, a congestion of the molten iron was achieved by narrowing the circular gate cross-section to a slit-shaped cross-section, with subsequent opening to the initial cross-section, so that the inoculant body lay virtually in the accumulated melt and could dissolve approximately in proportion to the amount of iron flowing through.
  • Example 1 Using inoculant bodies according to FIGS. 1 and 2, the filling time of the mold, at 12-13 seconds, was only slightly longer than in Example 1.
  • the weight of the truncated cone was 63.8 g and that of the double truncated cone was 66.2 g.
  • Both inoculant bodies had the chemical composition of the inoculant body of Example 1.
  • the cementite-free structure was immediately achieved using a graphite ball distribution according to the table below, using the inoculum body formed as a double-cone frustum and stored at both ends in recesses in the pouring wall.
  • the metallurgical result of the vaccination was checked on a batch of 40 crankshafts.
  • the table shows that the spherulites of the area with the largest diameter are now missing and that the mean ball diameter has become smaller. This significant improvement in the vaccine treatment leads to an increased bending fatigue strength of the casting or the crankshaft.
  • vaccine bodies made from inoculation alloys based on FeSi 45, FeSi 60 and FeSi 90 were also produced with a similar result, containing vaccine-active elements such as strontium, calcium, zirconium, barium, bismuth and rare earth metals such as Ce, La and others. were alloyed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
EP88201362A 1987-08-07 1988-06-30 Procédé d'inoculation de la fonte Expired - Lifetime EP0302540B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873726272 DE3726272A1 (de) 1987-08-07 1987-08-07 Verfahren zum impfen von gusseisen
DE3726272 1987-08-07

Publications (2)

Publication Number Publication Date
EP0302540A1 true EP0302540A1 (fr) 1989-02-08
EP0302540B1 EP0302540B1 (fr) 1992-05-06

Family

ID=6333267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201362A Expired - Lifetime EP0302540B1 (fr) 1987-08-07 1988-06-30 Procédé d'inoculation de la fonte

Country Status (3)

Country Link
US (1) US4867227A (fr)
EP (1) EP0302540B1 (fr)
DE (2) DE3726272A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017195018A1 (fr) * 2016-05-12 2017-11-16 Rail 1520 Ip Ltd. Procédé de modification d'un métal dans un moule de coulée

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9707766A (pt) * 1996-02-29 1999-07-27 Minnesota Mining & Mfg Corpo ótico
FR2839082B1 (fr) * 2002-04-29 2004-06-04 Pechiney Electrometallurgie Alliage inoculant anti microretassure pour traitement des fontes de moulage
DE10342582B4 (de) * 2003-05-06 2010-09-16 Halberg-Guss Gmbh Herstellen eines Gradientenwerkstücks durch Schichtgießen
US20050189083A1 (en) * 2004-03-01 2005-09-01 Stahl Kenneth G.Jr. Casting mold and method for casting achieving in-mold modification of a casting metal
DE102006036840A1 (de) * 2006-08-07 2008-02-28 Skw Giesserei Gmbh Verfahren zur Herstellung eines Eingusskerns mit Impfmittelkörper
EP3170578B1 (fr) * 2015-11-17 2021-06-30 GF Casting Solutions Kunshan Co. Ltd. Procédé de fabrication d'une pièce moulée en fonte à graphite sphéroïdal
CN109913741A (zh) * 2017-12-13 2019-06-21 科华控股股份有限公司 一种可消除灰铁铸件过冷石墨的随流孕育剂

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248239B (de) * 1965-01-22 1967-08-24 Metallgesellschaft Ag Verfahren zum Impfen von Gusseisen
DE1901366A1 (de) * 1969-01-11 1970-08-06 Daimler Benz Ag Einrichtung zum Impfen,Legieren od.dgl. von Metallguss
DE1936153A1 (de) * 1968-07-17 1970-08-20 Materials & Methods Ltd Verfahren und Vorrichtung zum Herstellen von Gusseisen mit knoetchen- oder kugelfoermigem Graphit
DE2011724A1 (de) * 1969-03-13 1970-10-08 Materials And Methods Ltd., Reigate, Surrey (Grossbritannien) Verfahren und Vorrichtung zum Behandeln von geschmolzenem Metall
DE2425122A1 (de) * 1973-05-28 1974-12-19 Pont A Mousson Mittel zur kugelgraphitbildung in fluessiger (gusseisen) schmelze sowie verfahren und vorrichtung zur verwirklichung der kugelpraphitbildung
DE2410109C3 (de) * 1973-03-05 1985-10-24 Deere & Co., Moline, Ill., US, Niederlassung Deere & Co. European Office, 6800 Mannheim Vorrichtung zur Herstellung von Gußeisen mit Kugelgraphit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59137155A (ja) * 1983-01-25 1984-08-07 Toshiba Corp 鋳型内接種剤
JPS61229462A (ja) * 1985-04-04 1986-10-13 Nabeya:Kk 球状黒鉛鋳鉄の製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248239B (de) * 1965-01-22 1967-08-24 Metallgesellschaft Ag Verfahren zum Impfen von Gusseisen
DE1936153A1 (de) * 1968-07-17 1970-08-20 Materials & Methods Ltd Verfahren und Vorrichtung zum Herstellen von Gusseisen mit knoetchen- oder kugelfoermigem Graphit
DE1901366A1 (de) * 1969-01-11 1970-08-06 Daimler Benz Ag Einrichtung zum Impfen,Legieren od.dgl. von Metallguss
DE2011724A1 (de) * 1969-03-13 1970-10-08 Materials And Methods Ltd., Reigate, Surrey (Grossbritannien) Verfahren und Vorrichtung zum Behandeln von geschmolzenem Metall
DE2410109C3 (de) * 1973-03-05 1985-10-24 Deere & Co., Moline, Ill., US, Niederlassung Deere & Co. European Office, 6800 Mannheim Vorrichtung zur Herstellung von Gußeisen mit Kugelgraphit
DE2425122A1 (de) * 1973-05-28 1974-12-19 Pont A Mousson Mittel zur kugelgraphitbildung in fluessiger (gusseisen) schmelze sowie verfahren und vorrichtung zur verwirklichung der kugelpraphitbildung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 25 (M-1)[507], 5. März 1980; & JP - A - 55 1927 (KAWASAKI JUKOGYO K.K.) 09.01.1980 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 263 (M-342)[1700] 4. Dezember 1984; & JP - A - 59 137 155 (TOSHIBA K.K.) 07.08.1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017195018A1 (fr) * 2016-05-12 2017-11-16 Rail 1520 Ip Ltd. Procédé de modification d'un métal dans un moule de coulée

Also Published As

Publication number Publication date
DE3726272A1 (de) 1989-02-16
DE3870755D1 (de) 1992-06-11
US4867227A (en) 1989-09-19
EP0302540B1 (fr) 1992-05-06

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