EP0379418A1 - Verfahren zum Druckgiessen von metallischen Platten oder Brammen und Einrichtung zur Durchführung dieses Verfahrens - Google Patents

Verfahren zum Druckgiessen von metallischen Platten oder Brammen und Einrichtung zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0379418A1
EP0379418A1 EP90400113A EP90400113A EP0379418A1 EP 0379418 A1 EP0379418 A1 EP 0379418A1 EP 90400113 A EP90400113 A EP 90400113A EP 90400113 A EP90400113 A EP 90400113A EP 0379418 A1 EP0379418 A1 EP 0379418A1
Authority
EP
European Patent Office
Prior art keywords
shells
liquid metal
mold
clamping
clamping 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
EP90400113A
Other languages
English (en)
French (fr)
Other versions
EP0379418B1 (de
Inventor
Robert André Vatant
Michel Francois Courbier
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.)
Creusot Loire SA
Creusot Loire Industrie SA
Clecim SAS
Original Assignee
Creusot Loire SA
Creusot Loire Industrie SA
Clecim SAS
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 Creusot Loire SA, Creusot Loire Industrie SA, Clecim SAS filed Critical Creusot Loire SA
Priority to AT90400113T priority Critical patent/ATE90013T1/de
Publication of EP0379418A1 publication Critical patent/EP0379418A1/de
Application granted granted Critical
Publication of EP0379418B1 publication Critical patent/EP0379418B1/de
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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/06—Ingot moulds or their manufacture
    • B22D7/08—Divided ingot moulds

Definitions

  • the present invention relates to a process for the pressure casting of metallic flat products such as slabs, from a bag of liquid metal.
  • the liquid metal contained in this pocket is poured, by compressed air pressure, into a mold comprising two side walls provided with graphite blocks as well as spacers delimiting a cavity for receiving the liquid metal, and two half-shells open upwards and downwards, complementary and placed above a chimney.
  • the latter is delimited by a front spacer, that is to say located on the side through which the liquid metal enters the mold, and by one end of an upper spacer, and forms an access for the liquid metal to the inside the hollow volume of the half-shells to form a counterweight of liquid metal.
  • the flyweight plays an important role in pressure casting, in that it largely contributes to the result, that is to say to the quality of the slab.
  • This flyweight essentially has the function of constituting a tank of liquid steel which replenishes the slab during its withdrawal and cooling between the graphite blocks and the spacers.
  • the counterweight forms a mass of steel sufficient to contain, after the end of the casting and the solidification of the bath, the almost inevitable shrinkage in the molds, so that it does not affect the final product.
  • the mold of the counterweight consists of the two aforementioned half-shells, generally made of cast iron, which are pressed against the front spacer on the one hand and on the upper spacer on the other hand, under the action elastic clamping members placed on each side of the half-shells.
  • the application force of the half-shells on the spacers must be much greater than the ferro-static force, in order to guarantee sealing against liquid metal.
  • this effort essential to fight against steel infiltration which would occur in the event of incorrect tightening, constitutes an opposition to the free withdrawal of the liquid steel from the counterweight by the base of the chimney, towards the actual slab, and this opposition is harmful for the quality of the slab obtained.
  • the clamping force exerted by the elastic members on the half-shells hinders the withdrawal of the slab through the base of the chimney towards the cavity between the graphite blocks.
  • the clamping force of the half-shells is greater than the force which the skin of the liquid metal capable of solidification is capable of, there are inevitably large cracks at the transition between the actual slab and the counterweight.
  • the object of the invention is to propose a method and a device for implementing it, eliminating the above drawbacks.
  • the pressure casting process is characterized in that during the pouring of the liquid metal into the half-shells and the start of its solidification, a high clamping force of the half-shells is maintained, then as soon as the the superficial skin of the flyweight is sufficiently solidified, the clamping force is reduced in order to eliminate any resistance to contraction of the flat product.
  • the device for implementing this method comprises, on each side of the half-shells, means for substantially reducing the clamping force of the elastic members after casting and at the start of solidification of the liquid metal.
  • the aforementioned means comprise, for each half-shell, a jack articulated thereon and carried by a fixed part of the mold, so as to be able to exert on the associated half-shell a tensile force transverse, opposite the clamping force of the elastic members.
  • the pressure casting installation to which the invention relates comprises (Fig. 1 and 2) a pocket 1 of liquid metal 2 disposed in a tank 4 supported by a carriage 10, as well as a mold 5 resting on a chassis 6 itself supported by columns 7 and by a hydraulic cylinder 8.
  • the tank 4 is provided with a sealed cover 9 through which a refractory tube 11 passes, the lower end of which dips into the liquid metal 2.
  • the upper end of the tube 11 passes through the cover 9 at a device known per se, making it possible to ensure a tight junction between an opening 12 for filling the mold 5 and the tube 11.
  • An apparatus 70 makes it possible to send inside the pocket 1 compressed air under suitable pressure, which expels the liquid metal 2 in the tube 11 to make it penetrate inside the mold 5, in order to pour into it the desired flat metallic product.
  • Fig.1 the assembly consisting of the mold 5 and its supporting frame 6 is shown horizontal.
  • the jack 8 makes it possible to tilt the chassis 6 and the mold 5 on the columns 7 around a horizontal axis 40 transverse to the plane of the figure, and constituting the articulation of this assembly on the columns 7. This tilting makes it possible to slightly tilt the mold 5 to bring it into its position allowing the pouring of the liquid metal 2, so known per se.
  • the mold 5 comprises two parallel side walls 25 each consisting of a support 30 and a graphite block 31 partially housed in the support 30 forming a graphite support frame.
  • the support frame 30 has, in the example shown, a C or U-shaped section, the upper and lower branches of which partially enclose between them the corresponding block 31.
  • the blocks 31 are pierced with channels 33 (FIG. 2) making it possible to receive cooling systems for the blocks 31 by spraying water.
  • the mold 5 also comprises, arranged between the internal faces 32 facing the two blocks 31, four spacers (20,21,22,23) interposed between the blocks 31 which are held tight on these spacers during the casting of the liquid metal by means not shown (cylinders and elastic devices arranged laterally to the walls 25) to prevent any leakage of liquid metal outside the spacers during casting.
  • spacers 20,21,22,23
  • the description of these clamping means as well as other constituent parts of the casting installation of Fig. 1 is given in detail in this patent application and does not relate to the present invention.
  • the mold 5 comprises the following spacers: - A lower longitudinal spacer 21, extending substantially over the entire length of the walls 25, and bearing on the central part of the chassis 6. - An anterior spacer 22, substantially vertical when the mold 5 is placed in a horizontal position (Fig.1) and whose lower end delimits with the adjacent end of the lower spacer 21 the orifice 12 of the liquid metal inlet in the constituent cavity of the mold 5 between the blocks 31. A rear spacer 23 perpendicular to the lower spacer 21, on which it can be moved in a sliding manner by a drive device 17 supported by the chassis 6. - An upper spacer 20, located slightly below the upper edge of the blocks 31, parallel to the spacer 21.
  • the upper spacer 20 is disposed above the lower spacer 21 at a height equal to that of the rear spacer 23, and which corresponds to the width of the flat product to be poured.
  • the spacers 20 to 23 all have the same thickness, which determines the thickness of the flat product.
  • the upper spacer 20 is carried by a suspension device 27 itself supported by a longitudinal beam not visible in the drawings.
  • This suspension device 27 is described in detail in a patent application filed on the same day as the present application by the Applicants and entitled “Support and adjustment device for the position of an upper spacer of a die-casting mold. ". This description is not of interest for the present invention. It will therefore simply be indicated that the suspension device 27 comprises several levers 51 pivotally mounted around axes carried by the above-mentioned beam, and that each lever 51 carries at its end a screw jack 61, the upper spacer 20 being suspended from the screws cylinders 61.
  • FIGS. 1 and 2 We will now describe more particularly the part of the pressure casting installation of FIGS. 1 and 2 targeted by the invention.
  • the upper spacer 20 comprises, opposite the upper end of the front spacer 22, an end portion 20b bent at a right angle upwards.
  • This bent part 20b extends vertically upwards over a certain height, as does the upper end of the spacer 22, with which it delimits an ascending channel 15 in which the cast metal can penetrate at the end of filling of the mold 5
  • This channel 15 puts the internal volume of the mold 5 into communication with a shell shown in FIGS. 3 and 4, formed by two complementary half-shells 41 and 42, open upwards and downwards, and delimiting them at their base an opening for introducing the liquid metal.
  • Each half-shell 41, 42 rests on the end of a block of graphite 31.
  • This shell 41, 42 can be partially filled at the end of casting by a counterweight 60 of liquid metal, in which after solidification of the slab, a shrinkage can occur.
  • the two half-shells 41 and 42 are kept applied against the upper end part 20b of the spacer 20 as well as against the upper end of the front spacer 22, in a liquid metal tight manner, by elastic clamping members.
  • These are, in the example described, two in number 43 and 44 each associated with a corresponding half-shell 41, 42.
  • Each pair of clamping members 43, 44 is housed in a casing 45 carried by the support 30 of the corresponding side wall 25.
  • Each clamping member 43, 44 comprises a helical spring 46 placed coaxially around a rod 47 disposed in a cylinder 48 secured to the casing 45 itself fixed to the support 30.
  • Each rod 47 passes through the bottom of the corresponding cylinder 48, through which it can slide in a direction perpendicular to the vertical longitudinal median plane of the shell 41, 42 and of the mold 5.
  • Each spring 46 is supported on the fixed bottom of the cylinder 48, in which it is held in place around the rod 47, while its opposite end bears on a lateral ear 49 of the associated half-shell 42 or 41, on which is thus exerted a transverse clamping force against the spacers ses 20 and 22, after proper calibration of the springs 46.
  • the bases 41a, 42a of the half-shells 41 and 42 rest with a slight lateral clearance on the linings 71 fixed on the blocks 31, in order to allow a slight transverse spacing of the half-shells 41, 42.
  • Each half-shell 41 and 42 is associated with a jack 52 (hydraulic or pneumatic), mounted so that its rod 53 can exert on the corresponding half-shell 41, 42 a transverse force in a direction parallel to that of the forces exerted by the elastic members 43 and 44.
  • Each rod 53 is therefore articulated on the associated half-shell 41, 42, while the body of the jack 52 is carried by a fixed part of the mold 5, for example as shown the corresponding support 30 of a side wall 25.
  • Each cylinder body 52 is here articulated on a flange 54 fixed to the upper part of the support 30, the cylinder being disposed in a substantially horizontal direction, perpendicular to the vertical longitudinal median plane of the mold 5 and of the shell 41 , 42, and preferably at a height such that it is interposed between the clamping members 43 and 44.
  • a jack 55 mounted on one of the casings 45 makes it possible to operate a tank 56 which contains a powder for covering the steel bath 60.
  • a bracket 57 carries at its end a vertical rod 58 which plunges into the shell 41, 42.
  • the bringing into contact of its lower end with the bath 60 corresponds to the end of the casting in the mold 5 and triggers an electrical contact, known way.
  • the force of the jacks 52 is adjusted to a value close to the relaxation of the springs 46 during the solidification of the liquid metal. This relaxation effort corresponds to the effort of the springs 46 slightly reduced.
  • the force exerted by the jacks 52 is therefore adjusted so as to in fact allow a firm static support for the solidified surface layer of the counterweight 60, while practically eliminating the efforts to withdraw the slab, which guarantees the non-appearance of coves at the slab-flyweight transition.
  • the diagram in FIG. 5 shows, by way of nonlimiting example, the clamping force F in daN of the half-shells 41, 42 as a function of the arrow, in millimeters of the clamping members 46.
  • This value corresponds to the total effort of the organs elastic 43 and 44.
  • the value F1 is the total clamping force of the elastic members 43 and 44, and the value F1-F2, is the force actually applied to the half-shells 41, 42 after actuation of the jacks 52.
  • the method and the means of its implementation provided for by the invention make it possible to avoid long, delicate and not very faithful adjustments, which would be necessary according to the different formats of slabs and the different heights of the weights required in the different cases.
  • the height of the counterweight varies essentially as a function of the volume of cast steel, of the insulation of the counterweight shell, and if necessary of the grade of cast steel.
  • the invention is capable of receiving different variants of executions.
  • the elastic members 43 and 44 can be replaced by stacks of elastic washers, ensuring like the devices shown in Fig.3, positive mechanical tightening safely during casting. If necessary, a single clamping member 43 or 44 could be arranged on each side of the shell.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Forging (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Press Drives And Press Lines (AREA)
EP90400113A 1989-01-16 1990-01-16 Verfahren zum Druckgiessen von metallischen Platten oder Brammen und Einrichtung zur Durchführung dieses Verfahrens Expired - Lifetime EP0379418B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90400113T ATE90013T1 (de) 1989-01-16 1990-01-16 Verfahren zum druckgiessen von metallischen platten oder brammen und einrichtung zur durchfuehrung dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8900457 1989-01-16
FR8900457A FR2642685B1 (fr) 1989-01-16 1989-01-16 Procede de coulee sous pression de produits plats metalliques tels que des brames et dispositif de mise en oeuvre de ce procede

Publications (2)

Publication Number Publication Date
EP0379418A1 true EP0379418A1 (de) 1990-07-25
EP0379418B1 EP0379418B1 (de) 1993-06-02

Family

ID=9377756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90400113A Expired - Lifetime EP0379418B1 (de) 1989-01-16 1990-01-16 Verfahren zum Druckgiessen von metallischen Platten oder Brammen und Einrichtung zur Durchführung dieses Verfahrens

Country Status (9)

Country Link
US (1) US5197530A (de)
EP (1) EP0379418B1 (de)
JP (1) JPH04504539A (de)
KR (1) KR910700110A (de)
AT (1) ATE90013T1 (de)
AU (1) AU4961690A (de)
DE (1) DE69001761T2 (de)
FR (1) FR2642685B1 (de)
WO (1) WO1990007996A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016105795A1 (de) * 2016-03-30 2017-10-05 Access E.V. Kokille zum Gießen eines konturierten Metallgegenstandes, insbesondere aus TiAl
CN113737009A (zh) * 2021-08-20 2021-12-03 鞍钢铸钢有限公司 一种扁平电极坯料的制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459256A (en) * 1966-04-13 1969-08-05 Amsted Ind Inc Casting apparatus
US3590904A (en) * 1967-03-29 1971-07-06 Amsted Ind Inc Method and appratus for cooling graphite molds
DE2140268A1 (de) * 1971-08-11 1973-02-22 Rheinstahl Huettenwerke Ag Giessform fuer das niederdruckgiessen grosser, glattwandiger gusstuecke

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163887A (en) * 1962-07-16 1965-01-05 Western Electric Co Compression molder
GB1316120A (en) * 1969-10-10 1973-05-09 Fisher Gauge Ltd Pressure casting
SU793715A1 (ru) * 1979-02-05 1981-01-07 Горьковский Политехнический Институтим. A.A.Жданова Установка лить под низким давлением
GB8604386D0 (en) * 1986-02-21 1986-03-26 Cosworth Res & Dev Ltd Casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459256A (en) * 1966-04-13 1969-08-05 Amsted Ind Inc Casting apparatus
US3590904A (en) * 1967-03-29 1971-07-06 Amsted Ind Inc Method and appratus for cooling graphite molds
DE2140268A1 (de) * 1971-08-11 1973-02-22 Rheinstahl Huettenwerke Ag Giessform fuer das niederdruckgiessen grosser, glattwandiger gusstuecke

Also Published As

Publication number Publication date
US5197530A (en) 1993-03-30
ATE90013T1 (de) 1993-06-15
AU4961690A (en) 1990-08-13
EP0379418B1 (de) 1993-06-02
JPH04504539A (ja) 1992-08-13
FR2642685A1 (fr) 1990-08-10
DE69001761D1 (de) 1993-07-08
KR910700110A (ko) 1991-03-13
DE69001761T2 (de) 1994-01-20
FR2642685B1 (fr) 1991-05-17
WO1990007996A1 (fr) 1990-07-26

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