EP0912276A1 - Dispositif de thixoformage - Google Patents

Dispositif de thixoformage

Info

Publication number
EP0912276A1
EP0912276A1 EP97917232A EP97917232A EP0912276A1 EP 0912276 A1 EP0912276 A1 EP 0912276A1 EP 97917232 A EP97917232 A EP 97917232A EP 97917232 A EP97917232 A EP 97917232A EP 0912276 A1 EP0912276 A1 EP 0912276A1
Authority
EP
European Patent Office
Prior art keywords
casting
engraving
mold
material flow
runs
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Withdrawn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
EP97917232A
Other languages
German (de)
English (en)
Inventor
Kurt Detering
Jörg Detering
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0912276A1 publication Critical patent/EP0912276A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B22D17/007—Semi-solid pressure die casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • 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
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2272—Sprue channels

Definitions

  • casting techniques can also be used to manufacture molded parts.
  • the latter come into question when very complicated, possibly thin-walled parts have to be produced, which cannot be produced by forging.
  • the material is viscous when forging, which is why certain minimum cross sections must not be undercut in view of reasonable pressures.
  • the material When pouring, however, the material is comparatively very thin.
  • the thin material can flow through narrow gaps in the engraving of the casting mold and easily fill complicated spaces.
  • the cycle times can be increased if, as with die casting, these boundary conditions do not have to be met.
  • the arrangement for die casting consists of a divisible casting mold, the mold halves of which contain the mold engravings.
  • a casting set is connected to the casting mold, which includes a fan-shaped casting run, which widens in the direction of the shape engraving and has its smallest cross-section in the casting chamber, which holds the liquid metal.
  • the liquid metal contained in the casting chamber is injected through the casting barrel into the mold engraving with the aid of a piston which is movable therein.
  • the flow velocities for the pressure greeting are 40 m / sec and can reach up to 60 m / sec. These high flow speeds lead to a turbulent flow in the jet and to the rupture of the metal jet in the casting run and the engraving.
  • the air contained in the casting mold and the pouring barrel is mixed into the thin-bodied metal. After cooling, the air pockets in the finished casting form tiny cavities that adversely affect the strength.
  • the casting chamber must be arranged under the die. Due to the arrangement and the high flow rate, the engraving fills from the end of the engraving which is furthest away from the casting run or the casting chamber; the engraving fills, so to speak, against the direction of influence of the material.
  • the die-cast component does not reach the necessary elongation and strength values with sufficient certainty, which is due on the one hand to the material to be used and on the other hand to the air pockets which are unavoidable in die-casting technology.
  • thixoforming is much cheaper.
  • thixoforming an alloy is used which, in a temperature range dependent on the material used, occupies an intermediate position between solid and liquid. It is believed in the professional world that the material at this temperature has a still firm but deformable structure with liquid components embedded therein. About 50% to 60% of the material is liquid during thixoforming, while the rest 20% is still in the solid state.
  • thixoforming In thixoforming, a bolt heated to the thixoforming temperature, the volume of which corresponds to the finished workpiece plus overflow, is placed in a press chamber. The thixotropic material is pressed into the mold using a casting piston. Since the thixoforming material is not flowable by itself, the position of the casting chamber is irrelevant. The material cannot run out of the casting chamber on its own. Thixoforming has already proven itself quite well for the production of elongated, approximately rod-shaped parts. The air pockets that occur during die casting are completely avoided because the material flow is so viscous that the air that is in the mold is displaced by the material without being able to penetrate the material.
  • the temperatures during thixoforming are comparatively lower, which means an energy reduction and, in addition, the casting chambers are filled with qusi solid bolts which can be handled safely.
  • Thixoforming does not require the dangerous transport of hot melt by truck across the street to the place of use.
  • the use of at least two casting runs makes it possible to avoid such a spontaneous solidification in the case of flat parts.
  • the shape of the casting runs is selected such that each generates a material flow, the material flow front of which, alone or together with another material flow, essentially completely fills the cross section of the engraving at the respective location of the material flow front.
  • FIG. 2 shows the casting machine according to FIG. 1 in a longitudinal section
  • FIG. 3 is a schematic representation of the invention modern device for thixoforming, in a plan view with the engraving open, and
  • Fig. 4 shows the device of the invention according to fig. 3 in a longitudinal section at right angles to the engraving gap.
  • a die 1 For die casting, a die 1 is used, which consists of a lower and an upper mold half 2, 3, which abut each other at a flat engraving gap 4. On the two abutting sides of the two mold halves 2, 3, a mold engraving 5, 6 is formed, which represents the negative of a workpiece to be created.
  • the finished workpiece is a rectangular plate, which is delimited by four mutually parallel narrow sides 7, 8, 9, 11 of the shape engraving 5, 6 and two flat sides.
  • the channel 18 tapers, starting from the outlet 19, in the direction of the engravings 5, 6.
  • the channel 18 opens at a so-called gate 21 into the cavity defined by the two engravings 5, 6.
  • the channel 18 contained in the casting run 16 merges into the cavity of the die 1 via a throttle point.
  • the casting chamber 13 is filled with the molten metal.
  • the metal is injected into the casting mold 1 under high pressure using the casting piston 15.
  • the molten material like a fountain, shoots from below in a more or less compact jet 22 of liquid metal through the channel 18 upwards into the cavity of the casting mold 1 until it hits the opposite edge 9.
  • the subsequently injected liquid metal keeps the previously injected material pressed against the wall 9 due to the inherent kinetic energy.
  • the mold cavity gradually fills from top to bottom, ie against the direction of flow of the injected metal, as is indicated schematically by material fronts 23a, 23b and 23c.
  • the material front 23a forms before the material front 23b is formed.
  • the bullet speed for the metal is between 40 and 60 m / s. At this high speed, turbulence occurs in the metal jet, in particular also caused by the taper at the gate 21, as a result of which the metal jet mixes with air contained in the casting mold 1, which forms finely distributed cavities in the solidified metal.
  • 3 and 4 show a highly schematic device 31, which is provided for thixo-forming, in order to produce relatively large-area parts in this way by means of primary shaping.
  • a thixotropic metal alloy is used which has thixotropic properties above a temperature which is dependent on the material, insofar as part of the metal, approx. 40% - 50%, physical state, while the rest is still in the solid state.
  • Such a thixotropic alloy exhibits a viscosity behavior in which the viscosity decreases with increasing shear stress.
  • the device according to the invention consists of a casting mold 32, to which a plurality of casting sets 33a, 33b, 33c are connected.
  • the casting mold itself consists of a lower mold half 34 and an upper mold half 35, which assembles between them an engraving 36, consisting of a mold engraving 37 in the upper mold half 35 and a mold engraving 38 in the lower mold half 34.
  • the necessary mold clamping unit is not shown because it is not necessary for an understanding of the invention.
  • the workpiece to be produced should have approximately a trapezoidal shape, and laterally by edges 39, 41, 42 and 43 of the engraving 36 and by imaginary dashed lines 44, 45 and 46 is limited, which should also symbolize the location of the gates.
  • the casting sets 33a ... 33c are identical to one another, which is why the same reference numerals are used for the individual components, each supplemented by a corresponding letter.
  • the casting set 33a includes a casting barrel 47a, the channel 48a of which connects a casting chamber 49a to the engraving 36.
  • the pouring run 48a mentally ends at the dashed line 44, i.e. the dashed line 44 corresponds to what is referred to in the die casting technique as a gate.
  • a casting piston 51a is slidably guided, which is driven via a casting piston rod 52a.
  • the casting piston drive is not shown further, since it is also not necessary for an understanding of the invention.
  • the channel 48a merges into the engraving 36 without any appreciable restriction.
  • the channel 48a is provided with essentially parallel side flanks 53 and 54, its width in the present case corresponding to the length of the gate 44.
  • the cross-sectional dimension of the associated channel 48b and 48c is smaller than the length of the relevant edge of the workpiece to be produced.
  • the wall 41 which is part of the two engraving halves 37 and 38, rises between the two channels 48b and 48c.
  • the channels 48b and 48c in the casting runs 47b and 47c are practically non-divergent in the direction of the mold engraving 36.
  • the two engravings 37 and 38 form an overflow 56, the position of which results from the following functional description:
  • the casting chambers 49a ... 49c are opened and they are charged with a hot bolt made of a thixotropic alloy and dimensioned in volume. The casting chambers 49a ... 49c are then closed.
  • the movable mold half that is to say the mold half 34 or the mold half 35, is pressed onto the fixed mold half 34, 35 by the mold clamping unit (not illustrated).
  • the casting drives for the casting pistons 51a ... 51c which are also not shown, are then started essentially simultaneously in order to press the material out of the casting chambers 49a ... 49c at a flow rate between 4 m / sec and 15 m / sec.
  • the material emerging from the casting chamber 49a forms a material flow, the foremost front 57 of which fills the entire cross section of the channel 48a and moves from the casting chamber 49a in the direction of the engraving 36.
  • the shape of the channel 48a and the position of the gate 44 are selected such that the material flow front 57 does not lose contact with the boundary wall of neither the channel 48a nor the engraving 36 at any point, and that the material remains flowing at all points on the material flow front .
  • Lines 57a ... 57c are intended to indicate various temporarily occurring positions of the material flow front.
  • the material flow fronts 59 and 61 run along the wall 41 until they touch each other, as a result of which the two material flows coming from the channels 48b and 48c , weld together. They then form a common material flow front 62 which moves towards the material flow front 57.
  • the flow directions of the material flows from the channels 48b and 48c are symbolized by arrows 63 and 64.
  • the material flow fronts 57 and 62 meet below the overflow 56 and also weld there. Since the only free space which is not yet filled is the overflow 56, the now combined material flows will flow into the T-shaped overflow 56, with which the engraving 36 is completely and completely filled.
  • the position of the gates 44, 45 and 46 as well as the geometry of the channels 48a ... 48c in connection with the shape of the shape engraving 36 are selected so that an inevitable flow movement without danger at all points of the material flow fronts 57, 59, 61, 62 stagnation is maintained. Such a condition is preferably met if the material flow fronts 57, 59, 61, 62 do not come into a position in which mushroom heads form and the material flow front comes to a standstill at any point on the wall or within the engraved shape 36.
  • the comparison of the casting using the thixoforming and the new device with the die casting shows that in the die casting, the engraving is filled against the inflow direction of the molten metal, while in the thixo molding the engraving is filled in the direction of the material flow .
  • the first shot material lies at the edge of the engraving, while in thixo forming, the first pressed material comes to lie more towards the center of the engraving, depending on where the material flows meet in opposite currents.
  • FIGS. 3 and 4 only represent the basic principles and that in this way any complicated flat-shaped structures, such as, for example, the cross member (dashboard support) of a car or the B pillar, can be produced by a correspondingly large one Number of cast fittings 33 is used to achieve the above properties fulfill. It is irrelevant whether the material flows in the direction of rotation completely fill the engraving 36, as is shown by way of example for the material flows from the casting sets 33b and 33c, or whether the material flows strive in opposite directions to one another or whether, as shown, a combination of all possible flow directions is used. Also, the channels 48 do not have to have a strictly constant cross section, but can also expand slightly as long as the flow conditions mentioned above are observed.
  • the channels 48 open into the shape engraving as freely as possible, i.e. in the area of the gates 44, 45, 46, no unnecessary artificial changes in cross-section may occur.
  • the finished workpiece in the area of the gate has almost the same thickness as the sprue residue present at this point, so that the sprue must generally be separated by cutting processes.
  • the advantage can be seen in the fact that unnecessary undercuts which are difficult to fill with the thixotropic mass are avoided.
  • the material can also flow into the mold engraving perpendicular to the engraving division if the casting set is arranged accordingly.
  • the metal flows into the engraving in one or in opposite directions depending on its location, i.e. after the first cut, the material flow is divided into two material flows.
  • At least two casting sets are provided to ensure that that when the form engraving is filled there are no areas in which the material flow spontaneously comes to a standstill and then takes an arbitrary course which may lead to incomplete filling of the form engraving.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne un dispositif de thixoformage pour lequel il est prévu au moins deux garnitures de coulée servant à garantir qu'au moment du remplissage de la gravure du moule il n'y ait pas de zones dans lesquelles le flux de matériau de coulée se ralentisse spontanément et suive ensuite un cours irrégulier risquant éventuellement d'entraîner un remplissage incomplet de la gravure du moule.
EP97917232A 1996-02-23 1997-02-21 Dispositif de thixoformage Withdrawn EP0912276A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1996106806 DE19606806C2 (de) 1996-02-23 1996-02-23 Vorrichtung zum Thixoforming
DE19606806 1996-02-23
PCT/DE1997/000314 WO1997030806A1 (fr) 1996-02-23 1997-02-21 Dispositif de thixoformage

Publications (1)

Publication Number Publication Date
EP0912276A1 true EP0912276A1 (fr) 1999-05-06

Family

ID=7786241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97917232A Withdrawn EP0912276A1 (fr) 1996-02-23 1997-02-21 Dispositif de thixoformage

Country Status (4)

Country Link
EP (1) EP0912276A1 (fr)
JP (1) JP2000504632A (fr)
DE (1) DE19606806C2 (fr)
WO (1) WO1997030806A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE19639052C2 (de) 1996-09-24 1998-07-09 Daimler Benz Ag Dünnwandiges, aus Leichtmetall bestehendes Druckgußteil als Strukturbauteil für Karosserien
AU754591C (en) * 1997-11-28 2004-10-14 Commonwealth Scientific And Industrial Research Organisation Magnesium pressure casting
AUPP060497A0 (en) 1997-11-28 1998-01-08 Commonwealth Scientific And Industrial Research Organisation Magnesium pressure die casting
EP0976475A1 (fr) * 1998-07-30 2000-02-02 Alusuisse Technology & Management AG Système d' orifice de coulée pour la fabrication de pièces moulées à partir d' un lingot métallique thixotrope dans des machines de coulée sous pression
AUPQ967800A0 (en) 2000-08-25 2000-09-21 Commonwealth Scientific And Industrial Research Organisation Aluminium pressure casting
DE10256834A1 (de) * 2002-12-04 2004-07-08 Drm Druckguss Gmbh Verfahren und Vorrichtung zur Herstellung großflächiger Werkstücke im Druckgießverfahren
DE102009032320B4 (de) * 2009-07-09 2019-12-12 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zum Spritzgießen eines Bauteils
DE102010053125A1 (de) * 2010-12-01 2012-06-06 Volkswagen Ag Verfahren zum Herstellen einer Serie von Gussbauteilen und Vorrichtung zum Herstellen eines Gussbauteils
DE102013105433B3 (de) * 2013-05-27 2014-05-22 Schuler Pressen Gmbh Gießvorrichtung mit einer Ringleitung und Gießverfahren
DE102015101289B4 (de) * 2015-01-29 2017-05-11 Power-Cast Ortmann GmbH & Co. KG Verfahren für den Druckguss und Vorrichtung zur Durchführung des Verfahrens
AT517860B1 (de) * 2015-10-27 2020-02-15 Christian Platzer Verfahren und Vorrichtung zur Herstellung zumindest eines Formteils
DE102015222422A1 (de) 2015-11-13 2017-05-18 Mahle International Gmbh Metallischer Deckel eines Spin-On Wechselfilters
DE102016123491B4 (de) 2016-12-05 2019-12-24 Schuler Pressen Gmbh Gießvorrichtung, Presse und Verfahren zum Gießen eines Bauteils
DE102020108022A1 (de) 2020-03-24 2021-09-30 Bayerische Motoren Werke Aktiengesellschaft Dreiplattendruckgusswerkzeug mit einem Angusssystem und verbesserter Angussabtrennung sowie Verfahren zum Druckgießen

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DE3502675A1 (de) * 1985-01-26 1986-07-31 Alfred Teves Gmbh, 6000 Frankfurt Verfahren zum formpressen eines formteils
CA1230459A (fr) * 1985-04-30 1987-12-22 Gellert, Jobst Ulrich Pointeau-sonde regulateur d'apport
DE3824609C1 (fr) * 1988-07-20 1990-01-18 Bayerische Motoren Werke Ag, 8000 Muenchen, De
JPH02192865A (ja) * 1989-01-20 1990-07-30 Ube Ind Ltd 射出成形方法および射出成形装置
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JPH06123550A (ja) * 1992-10-13 1994-05-06 Matsushita Refrig Co Ltd 真空断熱材パック
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Non-Patent Citations (1)

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Also Published As

Publication number Publication date
JP2000504632A (ja) 2000-04-18
DE19606806A1 (de) 1997-08-28
DE19606806C2 (de) 1998-01-22
WO1997030806A1 (fr) 1997-08-28

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