EP0940206A1 - Décrotteur d'oxyde - Google Patents

Décrotteur d'oxyde Download PDF

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Publication number
EP0940206A1
EP0940206A1 EP98810180A EP98810180A EP0940206A1 EP 0940206 A1 EP0940206 A1 EP 0940206A1 EP 98810180 A EP98810180 A EP 98810180A EP 98810180 A EP98810180 A EP 98810180A EP 0940206 A1 EP0940206 A1 EP 0940206A1
Authority
EP
European Patent Office
Prior art keywords
cavity
casting chamber
thixotropic
oxide
gate
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Withdrawn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
EP98810180A
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German (de)
English (en)
Inventor
Erich Röllin
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
Alusuisse Technology and Management Ltd
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 Alusuisse Lonza Services Ltd, Alusuisse Technology and Management Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to EP98810180A priority Critical patent/EP0940206A1/fr
Publication of EP0940206A1 publication Critical patent/EP0940206A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • B22D17/10—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with horizontal press motion

Definitions

  • the present invention relates to a horizontal die casting machine for the production of Shaped parts from thixotropic metal bolts by thixoforming, containing a mold with a mold cavity and a horizontal casting chamber with a casting chamber cavity.
  • the invention further relates to a thixoform process for the production of molded parts from thixotropic metal bolts in a horizontal die casting machine according to the invention, with the inclusion of the oxide skin surrounding the thixotropic metal bolt in the alloy structure of the molding can be avoided.
  • Thixoforming relates to the production of molded parts from thixotropic metal bolts. As Metal bolts all bolts come from a convertible into a thixotropic state Metal in question.
  • the thixotropic properties of a metal alloy mean that a suitably prepared metal behaves unloaded like a solid, under However, shear stress reduces its viscosity to such an extent that it is similar to a Metal smelt behaves. This involves heating the alloy into the solidification interval between liquidus and solidus temperature required. The temperature should be set that, for example, a structure fraction of 20 to 80% by weight is melted, the However, the rest remains in solid form.
  • Metallic bodies for example bodies made of aluminum, magnesium or zinc, or their Alloys, when they come into contact with their surrounding atmosphere, coat with a natural one Oxide skin, the thickness of which is usually well below a micrometer.
  • the heating process of a metal bolt for transferring the same, for example, into one This oxide layer is usually already naturally present on the circumference in a thixotropic state of the metal bolt, the so-called oxide skin.
  • the thickness of the during the heating process The oxide skin formed depends on the heating-up time required and the time surrounding the stud Atmosphere, as well as the alloy composition of the bolt in question.
  • the thickness of the oxide skin formed during the heating process is for aluminum bolts typically 0.1 to 10 ⁇ m.
  • impurities such as, for example, can also be present in the oxide skin Deposit alkali and alkaline earth metals.
  • the oxides formed during the heating process are usually found, i.e. Parts or particles of the oxide skin formed during the heating up again.
  • the in the Thixotropic metal alloy existing oxidic particles form in the molded part, for example oxidic inclusions or lead to the formation of pores in the alloy structure.
  • oxides and other non-metallic inclusions in the oxide skin in the molded part Create structural separation points. Consequently, the surface of the Thixotropic metal stud existing oxide skin, the alloy quality of the molded part and hence its mechanical properties. Especially for workpieces subject to high mechanical loads oxide inclusions are therefore undesirable or even prevent their use as mechanically strong components.
  • a major problem in thixoforming of thixotropic metal alloys therefore resides in the Oxide formation during the pretreatment, such as the heating process or the Transport of the metal bolt through the atmosphere surrounding it.
  • the thickness of the formed Oxide skin can be removed by special measures during the pretreatment of the metal bolts, such as by using an inert gas atmosphere surrounding the metal bolt reduced, but not entirely avoided. They are also used to reduce the Thickness of the oxide skin measures to be taken, in particular in the case of production in industrial Scale, complex and expensive.
  • EP-A 0 718 059 describes a horizontal die casting machine for the production of molded parts from thixotropic metal bolts, which between the casting chamber and the mold an annular oxide wiper with a concentric, has annular oxide collection ring, the oxide collection ring with the Interior of the oxide wiper via a concentric, ring-shaped oxide wiper opening connected is.
  • the thixotropic metal alloy flows through during the thixoforming process the interior of the annular oxide wiper, the thixotropic metal bolt
  • the surrounding oxide skin is flow mechanically through the oxide wiper opening into the oxide collecting ring is directed.
  • the oxide wiper opening has a correspondingly chosen, asymmetrical opening cross section on.
  • the fluid mechanical stripping of the oxide skin causes the precise control of the parameters relevant to fluid mechanics by the oxide wiper flowing, thixotropic alloy. For example, this requires precise knowledge of the Viscosity properties of the thixotropic alloy or precise control of the proportion solid / liquid, of pressure and temperature.
  • the object of the present invention is compared to the known prior art based on a horizontal die casting machine for the production of molded parts to provide thixotropic metal bolts that are used to manufacture oxide-free Molded parts without precise knowledge of the viscosity properties of the thixotropic metal alloy allowed, or the even stripping of the oxide skin with changing viscosity properties of the thixotropic metal alloy without making adjustments to the Horizontal die casting machine allowed.
  • the casting chamber is the thixotropic metal bolt picks up horizontally.
  • the concentric central axis of the casting chamber cavity becomes referred to as the longitudinal axis m of the casting chamber cavity.
  • the metal bolts can, for example, be made of any metal alloy which is used in the thixotropic state can exist. Metal alloys are preferred made of aluminum, magnesium, zinc, steel or copper, alloys made of aluminum, Magnesium or zinc are particularly preferred.
  • the thixotropic metal bolts are cylindrical and preferably have a round or oval cross section, but can also be polygonal cross-section.
  • the diameter of the metal bolts is, for example 50 to 180 mm, expediently 75 to 150 mm and preferably 100 to 150 mm.
  • the length of the metal bolts is, for example, 80 to 500 mm.
  • the casting chamber has a trough-shaped area for inserting a thixotropic Metal bolt and a closed-shaped adjoining it in the direction of the mold Area on.
  • the trough-shaped area expediently has a semi-cylindrical shape Recording area for the thixotropic metal bolt, and the closed
  • the area preferably has a hollow cylindrical shape.
  • the dimensions of the trough-shaped Range are preferably chosen such that the thixotropic metal bolts can be inserted without a necessary change in shape.
  • the cross section of the closed area corresponds, for example, to that of the thixotropic area Metal bolt.
  • the oxide knife is preferably located between the trough-shaped and the closed-shaped Area, i.e. the transition area of the casting chamber.
  • the horizontal die casting machine has the casting chamber wall of the closed region in one upper area an oxide opening, which on the one hand the insertion, lowering and pulling out of the oxide knife and on the other hand the removal of the stripped upper Edge zone from the casting chamber cavity enables the oxide opening, for example represent a slot-like recess in the casting chamber wall.
  • the dimensions of the oxide opening such that it is only that Inserting, lowering and pulling out the oxide knife allows the oxide skin during the thixoforming process is retained in the rear bolt part until the oxide knife is pulled out of the casting chamber cavity at the end of the thixoforming process.
  • the retained oxide skin thus remains in the bolt part whose alloy is not for the molded part is used in the so-called bolt cake, which after the thixoforming process is removed from the casting chamber cavity and disposed of.
  • the oxide knife is preferably essentially perpendicular to the longitudinal axis of the casting chamber cavity positioned, or more preferably with a perpendicular through the Longitudinal axis extending an acute angle of 0.5 to 20 °, for example to include a full circle of 360 °.
  • the yoke-shaped edge recess of the disc-shaped oxide knife is one against the Casting chamber cavity directed concave recess, the edge recess has an arched reveal.
  • the arcuate face of the yoke-shaped edge recess i.e. the yoke-shaped edge recess in a plan view seen from the longitudinal axis of the casting chamber, a semi-circular, semi-elliptical or have a parabolic shape.
  • the yoke-shaped edge recess of the oxide knife is preferably designed such that through its end face a radially evenly thick, upper edge zone of the thixotropic Metal pin is stripped.
  • the upper edge zone affects those in this sector of the Bolt cross-section of existing oxide skin.
  • the upper edge zone can also be one the area of the thixotropic metal alloy close to the oxide skin. Accordingly corresponds the shape of the yoke-shaped edge recess preferably that of the thixotropic metal bolt, the front dimensions opposite the yoke-shaped edge recess the cross-sectional segment covered by the end face of the yoke-shaped edge recess of the thixotropic metal bolt are smaller by a constant amount.
  • the front Opening cross section of the yoke-shaped edge recess is thus the cross-sectional shape of the adapted thixotropic metal bolt, but according to the edge zone of the thixotropic metal bolt by a predefined amount smaller.
  • the yoke-shaped edge recess is preferably such that the arcuate An edge layer of the thixotropic metal bolt on the face of the yoke-shaped edge recess a thickness of 0.5 to 5 mm and particularly preferably a thickness of 0.5 to 3 mm is stripped.
  • the edge recess therefore expediently has an arched opening a radius r, which is preferably 0.5 to 5 mm smaller than the radius of the thixotropic Metal bolt.
  • a radius r which is preferably 0.5 to 5 mm smaller than the radius of the thixotropic Metal bolt.
  • metal bolts do not have a circular shape.
  • the yoke-shaped recess is also preferably designed such that in cross section of the thixotropic metal bolt, the upper edge zone to be stripped off Central angle from 60 ° to 200 ° and in particular from 90 ° to 180 ° of the metal bolt cross section concerns.
  • the angle specifications here and in the following always relate to one Full circle of 360 °.
  • the upper edge zone to be stripped preferably has one with respect to one vertical plane through the longitudinal axis of the casting chamber symmetrical shape. Therefore the yoke-shaped edge recess preferably also has a correspondingly symmetrical one Shape up.
  • The is located between the casting chamber cavity and the mold cavity of the casting mold Gate and the gate.
  • the sprue preferably contains a cylindrical cavity, which adjoins the casting chamber cavity and prefers its longitudinal axis runs parallel to that of the casting chamber cavity. In the further lie the longitudinal axis m of the casting chamber cavity and the longitudinal axis of the sprue preferably in the same vertical plane. In a particularly preferred embodiment, the sprue has a circular cylindrical shape.
  • the dimensions and arrangement of the sprue with respect to the mold end of the Casting chamber cavity, the so-called pouring opening, are preferably such that the wall of the casting mold limiting the sprue with respect to a horizontal Level upper area represents an extension of the wall of the casting chamber cavity.
  • the sprue expediently has one opposite the adjacent casting chamber cavity Larger cross-sectional area, with the sprue opposite the casting chamber cavity is arranged such that the sprue - at least in a lower area - a has residual melt cavity formed as a depression.
  • the residual melt cavity serves especially the inclusion of the thixotropic alloy pulp during thixoforming residual liquid escaping.
  • residual liquid denotes a liquid Alloy content of the thixotropic metal alloy.
  • the residual melt cavity is very preferably designed such that it has a cross-sectional shape seen opposite the sprue opening of the casting chamber cavity Extension forms, the greatest depth of which is at the bottom of the sprue.
  • the residual melt cavity is in relation to a vertical plane through the longitudinal axis of the sprue preferably symmetrical.
  • the volume of the residual melt cavity is advantageously between 1 and 10% and in particular between 3 and 8% of the volume of the thixotropic metal bolt.
  • the sprue i.e. a channel-like connection of the sprue with the mold cavity, preferably begins at the top end of the sprue and preferably continues directly after the gate.
  • at least the duct section leading away from the sprue provides of the sprue is a vertically upward channel section.
  • the gate is on the side facing away from the casting chamber cavity by an impact element limited, wherein the impact element is an impact surface directed against the gate and a recess formed in a lower region of the impact element, has an open impact cavity towards the gate.
  • the impact surface is preferred arranged perpendicular to the longitudinal axis of the gate.
  • the impact cavity preferably relates to a horizontal plane through the Longitudinal axis of the sprue lower segment of the cylindrical sprue, the impact cavity preferred with respect to a vertical plane through the longitudinal axis of the gate is symmetrical.
  • the measured in the longitudinal direction of the horizontal die casting machine The depth of the impact cavity is preferably 1 to 15 mm and in particular between 2 and 8 mm.
  • the impact cavity preferably has a circular segment-shaped cross-section.
  • the channel section of the sprue that runs vertically upward is preferably in one Distance a to the impact surface arranged so that between a tangent plane to the Casting chamber facing away from the vertical sprue piece, which is also vertical to the longitudinal axis of the gate or parallel to the impact surface, and the impact surface an oxide cavity is formed.
  • the oxide cavity thus preferably describes a cylindrical one Gating cavity, which is on the one hand by the impact surface and on the other hand limited by a cross-sectional area of the sprue at a distance a from the impact surface becomes.
  • the oxide cavity serves in particular to hold the thixotropic on the front side Metal stud existing oxide skin.
  • the oxide cavity together with the impact cavity and the residual melt cavity form one Oxide pocket.
  • the volume of the oxide pocket serves on the one hand to accommodate the front on Bolt existing oxide skin and the residual liquid, on the other hand, this volume serves essentially to accommodate the lower edge zone of the thixotropic metal bolt.
  • the lower edge zone of the thixotropic metal bolt refers to the upper edge zone essentially complementary, jacket-shaped edge region of the thixotropic metal bolt.
  • the upper and lower edge zones together form essentially an annular Area containing mainly the oxide skin of the thixotropic metal bolt, as well optionally a region of the thixotropic alloy close to the oxide skin.
  • the vertically upward channel section of the sprue and its arrangement with regard to the impact surface on the one hand causes one during thixoforming curved flow of the thixotropic alloy pulp and on the other one in essentially space zone described by the oxide pocket, in which only low flow velocities occur.
  • This flow pattern during thixoforming it is achieved that the oxide skin deposited in the oxide pocket on the walls of the oxide pocket sticks and does not get carried away by the flow of the thixotropic alloy pulp and is deposited in the mold cavity.
  • the horizontal die casting machine thus enables the production of Molded parts made of thixotropic metal bolts without inclusions of components of the Oxide skin surrounding metal bolts in the alloy structure of these molded parts. Also happens the stripping of the oxide skin, especially in an upper edge area of the thixotropic Metal bolt, regardless of the pressure conditions in the thixotropic metal alloy, whereby a higher security and reproducibility compared to the state of the art of the thixoform process is achieved.
  • the invention further relates to a thixoform process for the production of moldings thixotropic metal bolts in a horizontal die casting machine according to the invention.
  • the object on which the method according to the invention is based is that of production of die cast parts from thixotropic metal bolts while avoiding inclusions of the the thixotropic metal stud surrounding the oxide skin in the alloy structure of the molded part, the thixoform process being essentially independent of the viscosity properties the thixotropic metal alloy should be feasible.
  • this object is achieved in that an upper edge zone of the thixotropic metal bolt, which relates to an annular sector of the metal bolt, in Stripped area of the casting chamber cavity and ejected from the casting chamber cavity or is retained in the casting chamber cavity with the stripped top Edge zone at least the existing oxide skin surrounding the metal bolt in this sector completely includes.
  • Suitable metal alloys for the process according to the invention are all commercially available metal alloys which can be converted into a thixotropic state.
  • the method according to the invention is particularly suitable for processing alloys made of aluminum, magnesium, zinc, steel or copper. In particular, cast aluminum and wrought aluminum alloys are preferred.
  • the method according to the invention is advantageously also suitable for processing particle-reinforced aluminum alloys which contain, for example, homogeneously distributed SiC or Al 2 O 3 particles.
  • the method according to the invention is very particularly suitable for aluminum alloys which have a pronounced solidification interval, such as AlSi7Mg.
  • the alloy of the metal bolts required for the method according to the invention contains, for example homogeneously distributed, primarily solidified solid particles that degenerate from individual ones Dentrites exist.
  • the proportion of solidified primarily solidified expediently 40% by weight or more.
  • the alpha mixed crystal is in a globulistic form in order to achieve an even flow of melt and solid.
  • the degenerate dentrites generally generally have a globulistic shape, which ensures a uniform, homogeneous flow of melt and solid without segregation can be achieved.
  • the metal bolt required for the method according to the invention is previously used for thixoforming to a temperature above the solidus temperature and below the liquidus temperature, i.e. heated to a partially solid, thixotropic state.
  • the metal bolts are usually heated in a separate oven.
  • the heating the furnace can run on fuel, such as gas or oil, or electrical energy, such as resistance heating or inductive energy input.
  • fuel such as gas or oil
  • electrical energy such as resistance heating or inductive energy input.
  • the metal bolt is heated in an induction furnace prefers.
  • the heating of the metal bolts is of great importance because the bolt condition, i.e. its partial strength, usually only in a small temperature range. Long heating times, for example the formation of a thick oxide skin or possible grain coarsening, should be avoided and to achieve a homogeneous end product the temperature distribution in the thixotropic metal bolt, the so-called Thixo blank, should be as homogeneous as possible. That is why the transfer of the Metal bolt into the thixotropic state, i.e. heating the bolt to the desired one Alloy portion is melted, preferably in an oven with a sensor regulated oven temperature.
  • the thixotropic alloy In the semi-solid state, the thixotropic alloy, the so-called thixotropic alloy pulp, contains the reverse developed dentritic, primary solid particles in a surrounding Liquid metal matrix.
  • the percentage of primary solid dentritic particles will expediently chosen such that the thixotropic metal bolt during the heating process, the transport into the casting chamber and in the casting chamber itself no noticeable Undergoes deformation and no noticeable loss of material due to dripping, for example of melt takes place.
  • the thixotropic alloy slurry preferably contains a proportion primary solid particles from 40 to 80 wt .-%.
  • a thixotropic metal bolt is placed in the trough-shaped Area of the casting chamber cavity inserted and by means of a casting piston with pressure acted on, so that the thixotropic metal bolt through the closed-shaped area of the casting chamber cavity is pushed, with an upper edge zone of the thixotropic Metal pin is stripped. Then the pressurized thixotropic alloy pulp arrives via the sprue and the sprue into the mold cavity.
  • the mold cavity can are or can be under ambient pressure during the method according to the invention be evacuated.
  • the pressurization of the thixotropic metal bolt by the casting piston is preferred chosen such that turbulence in the thixotropic metal alloy and thus the formation of gas and oxide inclusions in the molded part should be avoided if possible, i.e. the Pressurization of the casting piston is preferably done in such a way that a laminar one Flow of the thixotropic metal alloy with the surrounding oxide skin.
  • the pressure exerted by the casting piston is, for example, between 200 and 1500 bar, expediently between 500 and 1000 bar.
  • the resulting flow velocity the thixotropic alloy pulp is, for example, 0.2 to 3 m / s, expediently 0.3 to 2 m / s.
  • a thixoform process is also preferred, in which the process on the end face of the thixotropic Existing oxide skin, as well as a lower edge zone of the thixotropic metal bolt when hitting the impact surface of the impact element, together with the during the thixoforming of residual liquid emerging from the thixotropic alloy the oxide pocket located in the gate is passed, the lower edge zone being annular Sector of the metal bolt, which corresponds to the corresponding annular sector of the upper edge zone is complementary, and the stripped lower edge zone at least that in oxide skin present in this sector and completely surrounding the metal bolt.
  • the stripping of the upper edge zone of the thixotropic metal bolt can be further preferred happen continuously throughout the duration of the thixoforming process, so that the pro Unit of time stripped material quantity proportional to the feed speed of the casting piston is.
  • the oxide knife is inserted into the Casting chamber cavity inserted and held in a vertical position that in the upper Edge zone of the thixotropic metal bolt is a radially uniformly thick layer of the oxide skin and the area close to the oxide skin of the thixotropic metal alloy is stripped off, the oxide knife being pulled out of the casting chamber cavity before the casting piston reached the position of the oxide knife.
  • Figure 1 shows an example of a partial view of a vertical through the concentric central axis m of the casting chamber cavity 12 extending longitudinal section of an inventive Horizontal die casting machine, with a part of the horizontal lying in this longitudinal section Casting chamber 10 and the mold 40 can be seen.
  • the casting chamber 10 has a casting chamber cavity 12 which is cylindrical Casting chamber wall 14 is encased, the casting chamber 10 being a trough-shaped Area and a closed-shaped area 11. In Figure 1 is only a part of the closed region 11 is shown.
  • the casting chamber 10 serves the one hand Inclusion of a thixotropic metal bolt 24 and on the other hand the pressurization the same through a casting piston 20.
  • the casting chamber cavity 12 represents a substantially cylindrical through which Giesshuntwandung 14 limited volume with a concentric central axis, the Longitudinal axis m, represents.
  • the casting chamber cavity 12 is only in a mold side Area, i.e. the closed region 11 of a closed hollow cylindrical Casing, the casting chamber wall 14, surrounds and points to the mold 40 opposite side, for example a semi-cylindrical half-shell - not shown - On, which is used to insert the thixotropic metal bolt 24.
  • the one through the hollow cylindrical Casting chamber wall 14 caused closed-shaped casting chamber cavity 11 has, for example, a round, oval or polygonal cross section.
  • the diameter of the closed-shaped casting chamber cavity 11 preferably corresponds to 103 to 115% of the diameter of the thixotropic metal bolt, so that the metal bolt 24 after the insertion into the trough-shaped region of the casting chamber cavity 12 usually only on its underside a mechanical and thermal contact with the casting chamber wall 14 has.
  • a casting piston 20 is located on the side of the casting chamber 10 facing away from the casting mold 40 introduced the thixotropic alloy 24 with high pressure during the thixoforming the mold cavity 42 of the mold 40 presses.
  • the thixotropic metal alloy 24 loses the initially existing bolt shape, so that the in the closed region 11 of the Casting chamber 10 located thixotropic metal alloy 24 the entire cross section of the Filling chamber cavity 12 fills; at least in the area of the casting chamber close to the mold 10.
  • reference number 24 applies equally to the thixotropic metal bolts and the thixotropic metal alloy.
  • FIG. 1 also shows the disk-shaped oxide knife 30 essential to the invention, which is arranged here in the closed region 11 of the casting chamber 10.
  • the oxide knife 30 contains a yoke-shaped edge recess 31, which is designed such that an upper edge zone 26 of the thixotropic metal bolt 24 is stripped.
  • the upper edge zone 26 relates to the jacket-shaped or hollow cylindrical oxide skin 28 of the thixotropic metal bolt 24 in a cross-sectional, upper sector of the bolt cross-section.
  • Lowering and pulling out the oxide knife 30 further serves the oxide opening 22 for Removing the stripped top edge zone 26 from the casting chamber cavity 12.
  • the mold 40 shown in Figure 1 consists of a fixed mold half 44 with a Mold half recess 43 and a movable mold half 46 with a mold half recess 47, the mold halves recesses 43 and 47 of the two mold halves 44 and 46 together form the mold cavity 42 of the mold 40.
  • the gate is located between the casting chamber cavity 12 and the mold cavity 42 36 and the sprue 37.
  • the part of the sprue leading directly from the sprue 36 37 relates to a tubular channel piece 38 which is in the uppermost region of the sprue 36 begins and runs vertically upwards. That to the vertical channel piece 38 of the sprue 37 adjoining channel piece tapers towards the mold cavity 42.
  • the gate 36 has the shape of a cylindrical cavity, which adjoins the casting chamber cavity 12 and one to the longitudinal axis m of the casting chamber cavity 12 has parallel concentric longitudinal axis.
  • the longitudinal axis m of the casting chamber cavity 12 and the longitudinal axis of the gate 36 are in the same vertical plane.
  • the arrangement of the gate 36 with respect to the mold-side end of the casting chamber cavity 12, the so-called sprue opening 39, is such that the wall of the sprue 36 represents an extension of the casting chamber wall 14 in an upper region.
  • the gate 36 has a larger one than the adjacent casting chamber cavity 12 Cross-sectional area, wherein the gate 36 with respect to the mold-side end of the casting chamber cavity 12, the so-called pouring opening 39, is arranged such that the Wall of the sprue 36 in the uppermost region an extension of the casting chamber wall 14 and the gate 36 opposite the casting chamber cavity 12 in one lower region forms a residual melt cavity 62 designed as a depression. Therefore is the longitudinal axis of the sprue 36 with respect to the longitudinal axis m of the casting chamber cavity 12 shifted vertically downwards.
  • the gate 36 is on the side facing away from the gate 39 by an impact element 50 limited, the impact element 50 directed towards the gate 36 Impact surface 52 and one as a recess in a lower region of the impact element 50 formed impact cavity 54 open towards the gate 36.
  • the impact surface 52 is arranged parallel to a cross-sectional area of the gate 36 and is therefore perpendicular to the concentric longitudinal axis of the gate 36.
  • the vertically upward-extending channel piece 38 of the sprue 37 is on the one hand in a distance a to the impact surface 52 and, on the other hand, directly to the sprue opening 39 then arranged.
  • the volume of the gate 36 between the cross-sectional area by the boundary of the vertical duct piece 38 closest to the impact surface 52 and the impact surface 52 describes the oxide cavity 56.
  • the oxide cavity 56 forms together the oxide pocket 60 with the impact cavity 54 and the residual melt cavity 62.
  • the shield 18 and the fixed mold half 44 have a continuous opening for receiving the casting chamber 10 on.
  • the shield 18 also has a directed against the continuous opening and groove-shaped recess 17 arranged at the edge of the mold 40.
  • This groove-shaped Recess 17 serves to receive a complementarily shaped stop rib 16 of the casting chamber 10.
  • the groove-shaped recess 17 of the shield 18 and the molded one Stop rib 16 of the casting chamber 10 are expediently radially symmetrical educated.
  • Figure 1 shows the horizontal die casting machine in the initial state of the thixoforming process represents, i.e. the filling of the mold cavity 42 has not yet started.
  • the thixotropic metal alloy 24 is located in the casting chamber cavity 12 and has its outer bolt shape already lost, i.e. the thixotropic metal alloy 24 and the oxide skin 28 surrounding it essentially fill the entire cross-sectional area of the casting chamber cavity 12. Seen in longitudinal section through the horizontal die casting machine, the oxide skin 28 is on to recognize the lower and upper edge of the thixotropic metal alloy. Through the oxide knife 30, an upper edge zone 26 of the oxide skin 28 is stripped off and through the oxide opening 22 excreted from the casting chamber cavity 12.
  • Figure 2 shows a partial view of a vertically through the concentric central axis m of the casting chamber cavity running longitudinal section of a horizontal die casting machine according to the invention during mold filling.
  • the horizontal die casting machine shown in Figure 2 corresponds to that in FIG. 1, the casting piston 20 being up to shortly before the oxide knife 30 introduced and the mold cavity 42 already partially with thixotropic alloy is filled.
  • the thixotropic metal alloy 24 is shown with dots.
  • FIG. 2 also shows the part which is partially filled with parts of the oxide skin 28 and residual melt See oxide pocket 60.
  • the lower edge zone of the oxide skin 28 is together with the thixotropic alloy 24 pushed into the gate 36, the oxide skin 28, i.e. the Oxide skin on the face of the metal bolt and the lower edge zone, due to the impact on the impact surface 52 essentially into the impact 54 and oxide cavity 56 of the Oxide pocket 60 is passed.
  • Part of the oxide skin 28 is - along with that during the Thixoforms from the thixotropic alloy slurry 24 emerging residual melt - into the Residual melt cavity 62 passed.
  • an oxide pocket 60 is formed, in which only a very low speed field in terms of amount of the flow filling the mold cavity.
  • the mainstream the thixotropic metal alloy 24 runs horizontally from the pouring opening 39 coming streamlined vertically upwards to the sprue 37. Because of the low Velocity field in the oxide pocket 60 is avoided that already in the oxide pocket 60 deposited components of the oxide skin 28 entrained with the main flow and be deposited in the mold cavity 42.
  • Figure 3 shows a cross section through the casting chamber 10 along the line A-A in Figure 1. This corresponds to a section through the horizontal die casting machine perpendicular to Longitudinal axis m of the casting chamber cavity 12 at the location of the oxide knife 30, the Section A-A runs along the end face 33 of the oxide knife 30. 3 shows this a cross section through the hollow cylindrical casting chamber wall 14 of the closed Area 11 of the casting chamber 10, the thixotropic metal bolt located therein 24, the oxide knife 30, and a portion of the oxide knife guide 32.
  • the casting chamber cavity 12 has a circular cross section and the yoke-shaped edge recess 31 of the Oxide knife 30 has an arcuate cross section.
  • the radius r of the yoke-shaped The edge recess 31 is smaller by the dimension b than the radius of the casting chamber cavity 12. This creates a jacket-like upper edge zone during the thixoform process 26 of the thickness b of the thixotropic metal bolt 24 stripped.
  • the yoke-shaped edge recess 31 comprises a central angle of 180 °, or an arc length of r ⁇ ⁇ , so that the stripped, upper edge zone 26 likewise comprises a central angle of 180 ° and the upper edge zone 26 has a cross-sectional area of b. ⁇ . (r + b / 2) having.
  • the yoke-shaped edge recess 31 and thus also the upper edge zone 26 are symmetrical with respect to the vertical plane through the longitudinal axis m of the casting chamber cavity 12.
  • Figure 4 shows a cross section through the sprue 36 of the mold 40 along the line B-B in Fig. 1. This corresponds to a section through the horizontal die casting machine vertically to the concentric longitudinal axis of the sprue 36 at the location of the impact surface 52 3 shows a cross section through the movable mold half 46 and the sprue 36.
  • the sprue 36 is circular cylindrical.
  • the dashed line c represents that shown in FIG. 4 Cross-sectional area projected circumference of the casting chamber cavity cross-section.
  • the cross section shown in FIG. 4 also shows the residual melt cavity 62, which versus the cross-sectional area of the casting chamber cavity, i.e. compared to that of the Dashed line c enclosed area, has a crescent shape. Thereby the residual melt cavity 62 forms a crescent-shaped enlargement of the casting chamber cavity 12, which at the bottom of the gate 36, i.e. at the bottom of the in Figure 4 shown cross-sectional area, which has the greatest depth.
  • FIG 4 shows the impact cavity 54, which is a lower segment of the cylindrical Socket 36 relates, wherein the impact cavity 54 with respect to a vertical is formed symmetrically through the center of the gate 36. In the further the Impact cavity 54 is superimposed in its lower region by the residual melt cavity 62.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP98810180A 1998-03-04 1998-03-04 Décrotteur d'oxyde Withdrawn EP0940206A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926653A1 (de) * 1999-06-11 2000-12-21 Audi Ag Verfahren zum Durchführen von Thixoforming sowie Thixoforming-Vorrichtung zur Durchführung des Verfahrens
WO2004007119A1 (fr) * 2002-07-12 2004-01-22 Bühler Druckguss AG Procede de production de pieces moulees sous pression et de moule
EP1491276A1 (fr) * 2003-06-23 2004-12-29 ALCAN BDW GmbH & Co. KG Chambre d'une machine d'injection sous pression et méthode de remplissage de la cavité de cette machine
US8327914B2 (en) * 2009-11-06 2012-12-11 National Research Council Of Canada Feeding system for semi-solid metal injection
CN113770337A (zh) * 2021-08-07 2021-12-10 山东钢峰新材料科技有限公司 一种pc钢棒具有除锈功能的熔铸装置

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Publication number Priority date Publication date Assignee Title
US3658121A (en) * 1970-12-14 1972-04-25 Gen Motors Corp Die casting apparatus
DE3044992A1 (de) * 1980-11-28 1982-06-16 Oskar Frech GmbH + Co, 7060 Schorndorf Verfahren zur herstellung von metalldruckgussteilen
EP0254437A2 (fr) * 1986-07-23 1988-01-27 Alumax Inc. Procédé pour la fabrication de parties métalliques façonnées
DE4015174A1 (de) * 1990-05-11 1991-11-14 Buehler Ag Form zum spritz- oder druckgiessen und spritz- oder druckgiessmaschine mit einer solchen form
DE19507995A1 (de) * 1994-05-31 1995-12-07 Buehler Ag Formmaschine
EP0710515A1 (fr) * 1994-11-07 1996-05-08 Reynolds Wheels International Ltd. Procédé thixotropique pour la fabrication de roues en alliage à l'état de mélange liquide-solide
EP0718059A1 (fr) * 1994-12-22 1996-06-26 Alusuisse-Lonza Services AG Décrotteur d'oxyde

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658121A (en) * 1970-12-14 1972-04-25 Gen Motors Corp Die casting apparatus
DE3044992A1 (de) * 1980-11-28 1982-06-16 Oskar Frech GmbH + Co, 7060 Schorndorf Verfahren zur herstellung von metalldruckgussteilen
EP0254437A2 (fr) * 1986-07-23 1988-01-27 Alumax Inc. Procédé pour la fabrication de parties métalliques façonnées
DE4015174A1 (de) * 1990-05-11 1991-11-14 Buehler Ag Form zum spritz- oder druckgiessen und spritz- oder druckgiessmaschine mit einer solchen form
DE19507995A1 (de) * 1994-05-31 1995-12-07 Buehler Ag Formmaschine
EP0710515A1 (fr) * 1994-11-07 1996-05-08 Reynolds Wheels International Ltd. Procédé thixotropique pour la fabrication de roues en alliage à l'état de mélange liquide-solide
EP0718059A1 (fr) * 1994-12-22 1996-06-26 Alusuisse-Lonza Services AG Décrotteur d'oxyde

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926653A1 (de) * 1999-06-11 2000-12-21 Audi Ag Verfahren zum Durchführen von Thixoforming sowie Thixoforming-Vorrichtung zur Durchführung des Verfahrens
DE19926653B4 (de) * 1999-06-11 2005-12-15 Audi Ag Verfahren zum Durchführen von Thixoforming sowie Thixoforming-Vorrichtung zur Durchführung des Verfahrens
WO2004007119A1 (fr) * 2002-07-12 2004-01-22 Bühler Druckguss AG Procede de production de pieces moulees sous pression et de moule
EP1491276A1 (fr) * 2003-06-23 2004-12-29 ALCAN BDW GmbH & Co. KG Chambre d'une machine d'injection sous pression et méthode de remplissage de la cavité de cette machine
US8327914B2 (en) * 2009-11-06 2012-12-11 National Research Council Of Canada Feeding system for semi-solid metal injection
CN113770337A (zh) * 2021-08-07 2021-12-10 山东钢峰新材料科技有限公司 一种pc钢棒具有除锈功能的熔铸装置
CN113770337B (zh) * 2021-08-07 2023-08-11 山东钢峰新材料科技有限公司 一种pc钢棒具有除锈功能的熔铸装置

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