EP3636365B1 - Casting mould for manufaturing a casting part by having at least one internal contour and the use of such mold - Google Patents
Casting mould for manufaturing a casting part by having at least one internal contour and the use of such mold Download PDFInfo
- Publication number
- EP3636365B1 EP3636365B1 EP19200013.1A EP19200013A EP3636365B1 EP 3636365 B1 EP3636365 B1 EP 3636365B1 EP 19200013 A EP19200013 A EP 19200013A EP 3636365 B1 EP3636365 B1 EP 3636365B1
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- Prior art keywords
- mandrel
- core segments
- core
- casting
- casting mould
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- 238000005266 casting Methods 0.000 title claims description 38
- 238000004519 manufacturing process Methods 0.000 claims description 7
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- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims 1
- 238000013507 mapping Methods 0.000 claims 1
- 238000004512 die casting Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005058 metal casting Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
- B22C9/064—Locating means for cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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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
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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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
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/229—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies with exchangeable die part
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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
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/24—Accessories for locating and holding cores or inserts
Definitions
- the invention relates to a casting mold or a casting tool for the production of a metal cast part, which has a hollow-cylindrical area with a cylindrical inner contour. Furthermore, the invention relates to the use of such a casting mold.
- a casting mold is a mostly metallic (reusable) permanent form for the production of cast (component) parts.
- a casting mold has a mold cavity that can be filled with melt or liquid metal and forms the cast part. Hollow or inner contours provided in the cast part can be mapped with the help of immovable cores or movable slides.
- a casting mold is constructed in several parts and consists, e.g. B. from a fixed and a movable mold half.
- so-called drafts are required in order to be able to lift the cast part. Such drafts should also be provided on cores (if they are reusable permanent cores) or on slides.
- the mold has a mold cavity (cavity).
- the mold also has at least one multi-part slide for forming an inner contour (undercut) in the cast components.
- the slide is designed in two parts with a first partial slide and a second partial slide. When retracting, the partial slides can be moved separately, ie separately from one another, with opposite oblique directions, so that extraction bevels or bevels are not required.
- the first partial slide and the second partial slide are designed with corresponding inclined surfaces on which the partial slides can slide against one another when they are pulled back.
- Injection molding tools with multi-part cores for imaging inner contours or undercuts are known for plastic injection molding, which have a centrally arranged mandrel or the like and arranged around the mandrel core segments, wherein the core segments can be displaced transversely to the direction of movement of the mandrel by longitudinal displacement of the mandrel.
- the relevant prior art is on the US 4,541,605A ,
- the invention is based on the object of specifying a further (ie alternative) advantageous casting mold for the production of a metal cast part, which has at least one core without the usual extraction bevels.
- the object is achieved by the casting mold according to the invention of claim 1. That is, the invention now provides a further, particularly advantageous casting mold with the features mentioned in claim 1, which has at least one core without the otherwise usual drafts or drafts having.
- Advantageous developments of the casting mold according to the invention result from the dependent patent claims, the following description of the invention and also from the figures.
- the casting mold (casting tool) according to the invention is in particular a chill mold for chill casting or a die-casting or die-casting mold for die-casting metals, in particular light metals.
- the invention is also suitable for other metal casting processes in which permanent molds are used.
- Both the mandrel and the core segments are part of the mold and form a permanent core.
- the mandrel can be moved in its longitudinal or axial direction and can use a suitable drive can be extended and retracted, which is comparatively easy to do. As it extends, the mandrel is advanced or pushed toward the mold cavity. During retraction, the mandrel is moved back or withdrawn in the opposite direction (ie, out of the mold cavity).
- the core segments are moved outwards transversely, in particular essentially perpendicularly, to the direction of movement of the mandrel and assume a casting position.
- the core is quasi expanded and takes on the shape of the inner contour to be imaged.
- the core segments When the mandrel is retracted, the core segments are moved inwards transversely to the direction of movement of the mandrel and assume a demoulding position, whereby the cross-section of the core is reduced or narrowed, so to speak, and demoulding of the cast part produced is made possible without drafts or draft angles. Only small machining allowances are therefore required for the inner contour, which on the one hand reduces the post-processing effort and material consumption and on the other hand reduces the risk of defects.
- the mandrel is centrally located and the core segments are arranged around the mandrel. This enables a compact core structure and ensures effective function.
- the mandrel and core segments are formed with complementary ramps that form a wedge slide mechanism.
- Wedge slide mechanisms are known in various designs from toolmaking.
- the mandrel can, for example, have a conical or frustoconical section, on which the core segments formed with corresponding complementary surfaces can slide and are thereby displaced transversely to the direction of movement of the mandrel.
- the core segments can be spring-loaded against the mandrel.
- the springs which are in particular compression springs (coil springs), ensure physical contact between the core segments and the mandrel and can also cause the return (return) of the core segments (to the demoulding position).
- the reset can also be hydraulic, pneumatic or mechanical (e.g. by means of an umbrella mechanism or other suitable linkage system).
- the movement of the core segments is preferably guided by means of slot guides or the like.
- the core segments can, for example, be mounted in grooves provided for this purpose by means of one or more sliding blocks.
- the groove guides can also be designed with end stops that limit the movements of the core segments.
- the core segments can have shape elements that enable the depiction of an undercut inner contour. This means that undercuts can already be created during casting on the inner contour of the cast part, which would no longer be demouldable with conventional permanent cores or slides.
- the cast part to be produced has a hollow-cylindrical area, the cylindrical inner contour of which is reproduced with the multi-part core, this core having three or more movable core segments and the mandrel being designed with three or more pockets in which these core segments can be moved transversely are arranged.
- the mandrel has three or more radially extending ridges extending (longitudinally and radially) between the pockets, the outer (radial) surfaces of these radial ridges together with the outer (radial) surfaces of those in the pouring position Core segments specify or define the inner contour to be mapped.
- the (radial) outer surfaces of the radial webs are preferably designed with draft bevels so that the mandrel can be inserted or withdrawn more easily.
- the casting mold according to the invention is preferably used to produce a stator pot for an electric machine, for which purpose a cast aluminum or magnesium alloy is used in particular.
- a cast aluminum or magnesium alloy is used in particular.
- the invention is not limited to this.
- the die casting mold 100 shown has a lower, fixed mold half 110 and an upper, movable mold half 120 .
- the lower mold half 110 is formed with a mold cavity 130 for the production of a ring-cylindrical die-cast part 200 .
- the hollow-cylindrical inner contour is reproduced with the aid of a core 140, which will be explained in more detail below, and which is intended to keep the cavity free of melt during die-casting. That is to say, the mold cavity 130 is formed by an outer cavity wall of the lower mold half 110 and an inner cavity wall of the core 140, which together with the end cavity walls define the shape or form of the die-cast part 200 to be produced.
- the standing orientation is only an example.
- the mold halves 110, 120 can also be formed with a vertical division as right and left mold halves.
- the die-cast part 200 is z. B. a thin-walled stator for receiving stator cores in an electric machine for the traction drive (electric drive) of a motor vehicle.
- the die-cast part 200 is comparatively thin-walled (e.g. ⁇ 5 mm) in relation to its diameter (e.g. >200 mm).
- high mechanical demands are placed on the die-cast part 200 .
- the draft angles that usually have to be provided on the outer cavity wall and on the inner cavity wall result in high and unequal wall thicknesses, which means there is an increased risk of defects.
- the core 140 is of multi-part design and has a plurality of transversely movable core segments 146 and a mandrel 141 which is arranged between these core segments 146 and can be displaced longitudinally or axially.
- the 141 mandrel is how out 2 and 4 as seen, is formed with three uniform pockets 145 in which the identically shaped core segments 146 are located.
- the mandrel 141 is also formed with a central cone or truncated cone 142 and three radial webs 143 which protrude in the radial direction R and extend like wings at an angular distance of approximately 120° between the pockets 145 .
- the mandrel 141 is preferably manufactured in one piece, as in 4 shown.
- the core segments 146 rest on their radial inner surfaces in a form-fitting manner on the cone 142 and are designed for this purpose with complementary partial cone surfaces.
- the core segments 146 are moved radially outwards transversely to the direction of movement of the mandrel 141 by means of a wedge slide mechanism (the cone 142 acts like a driving wedge) (the displacement path and a Transmission ratio can be set) and assume a casting position, the radial outer surfaces 144 of the radial webs 143 together with the radial outer surfaces 147 of the core segments 146 defining the cylindrical inner contour to be imaged.
- the core segments 146 have shaped elements 148 on their outer surfaces 147 (see 1 ) for forming undercut geometries on the inner contour. This allows undercut geometries such.
- the mandrel 141 is retracted before the die-cast part 200 has reached its demoulding temperature (in order to keep the shrinkage forces small), for which purpose it is shown in 3 illustrated, is moved back or withdrawn downwards.
- the core segments 146 are moved radially inwards transversely to the direction of movement of the mandrel 141 and assume their demolding position, with a circumferential gap S forming between the radial outer surfaces 147 and the inner contour of the die-cast part 200 (the core 200 is therefore no longer in contact with the die-cast part 200), which allows easy lifting of the die-cast part 200.
- the die-cast part 200 is removed from the mold upwards.
- the outer surfaces 144 of the radial webs 143 are designed with draft bevels (e.g. 1° to 3°), preferably over their entire length, so that they become detached from the die-cast part 200 when the mandrel 141 is pulled back be able.
- the outer surfaces 147 of the core segments 146 are formed without drafts.
- Conventional drafts may be present on the outer cavity wall of the lower mold half 110 .
- the lower mold half 110 can also be designed with a vertical split for demoulding, so that no drafts are required at all.
- the ring-cylindrical die-cast part 200 can thus be die-cast with a uniformly thin wall thickness and only small machining allowances (e.g. ⁇ 1.5 mm).
- the core segments 146 are displaced transversely to the movement axis L of the mandrel 140 by extending the mandrel 141 and brought into a casting position, as in FIG 1 illustrated with arrows. By retracting the mandrel 141, the core segments 146 are brought into a demolding position or reset, as in 3 illustrated with arrows. In this case, the core segments 146 are only displaced in radial directions R (in contrast to a slider which is moved back and forth by extending and retracting). A radial movement guidance of the core segments 146 takes place both through the radial webs 143 and with the aid of slot guides.
- the lower mold half 110 is formed with grooves 119 or the like, in which the core segments 146 are fastened by means of sliding blocks 149 or The like are movably mounted in the radial direction R and held in place in the circumferential direction and in the axial direction and secured against twisting and tilting.
- the sliding blocks 149 can be screwed onto the core segments 146 or can also be designed in one piece with the core segments 146 .
- springs 150 which bias the core segments 146 against the mandrel 141 and enable resetting.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
Die Erfindung betrifft eine Gießform bzw. ein Gießwerkzeug zur Herstellung eines metallischen Gussteils, welches einen hohlzylindrischen Bereich mit einer zylindrischen Innenkontur aufweist. Weiterhin betrifft die Erfindung die Verwendung einer solchen Gießform.The invention relates to a casting mold or a casting tool for the production of a metal cast part, which has a hollow-cylindrical area with a cylindrical inner contour. Furthermore, the invention relates to the use of such a casting mold.
Eine Gießform ist eine zumeist metallische (wiederverwendbare) Dauerform für die Herstellung von Guss(bau)teilen. Eine Gießform weist hierzu einen mit Schmelze bzw. flüssigem Metall befüllbaren Formhohlraum auf, der das Gussteil abbildet. Im Gussteil vorgesehene Hohl- bzw. Innenkonturen können mithilfe von unbeweglichen Kernen oder bewegbaren Schiebern abgebildet werden. Um nach dem Erstarren der Schmelze das hergestellte Gussteil entformen zu können, ist eine Gießform mehrteilig aufgebaut und besteht z. B. aus einer feststehenden und einer beweglichen Formhälfte. Ferner sind sogenannte Formschrägen erforderlich, um das Gussteil auszuheben zu können. Solche Formschrägen sind ebenfalls an Kernen (sofern es sich um wiederverwendbare Dauerkerne handelt) oder an Schiebern vorzusehen. Formschrägen führen am Gussteil jedoch zu Aufmaßen. Diese Aufmaße müssen dann bei der Gussteilnachbearbeitung entfernt werden (dies geschieht zumeist durch spanende Bearbeitung), was aufwändig ist und mit hohem Materialverbrauch einhergeht. Ferner können solche Aufmaße auch zu hohen Wanddicken führen, sodass eine erhöhte Gefahr für Fehlstellen (z. B. Schwindungslunker und Gaseinschlüsse) besteht.A casting mold is a mostly metallic (reusable) permanent form for the production of cast (component) parts. For this purpose, a casting mold has a mold cavity that can be filled with melt or liquid metal and forms the cast part. Hollow or inner contours provided in the cast part can be mapped with the help of immovable cores or movable slides. In order to be able to demould the casting produced after the melt has solidified, a casting mold is constructed in several parts and consists, e.g. B. from a fixed and a movable mold half. Furthermore, so-called drafts are required in order to be able to lift the cast part. Such drafts should also be provided on cores (if they are reusable permanent cores) or on slides. Drafts, however, lead to allowances on the cast part. These oversizes then have to be removed during the post-processing of the cast part (this is usually done by machining), which is complex and involves high material consumption. Furthermore, such allowances can also lead to high wall thicknesses, so that there is an increased risk of defects (e.g. shrinkage cavities and gas pockets).
In der nächstliegenden
Ausgehend von der
Die Aufgabe wird gelöst durch die erfindungsgemäße Gießform des Patentanspruchs 1. D. h., mit der Erfindung steht nun eine weitere, besonders vorteilhafte Gießform mit den im Patentanspruch 1 genannten Merkmalen zur Verfügung, die wenigstens einen Kern ohne die sonst üblichen Formschrägen bzw. Ausziehschrägen aufweist. Vorteilhafte Weiterbildungen der erfindungsgemäßen Gießform ergeben sich aus den abhängigen Patentansprüchen, der nachfolgenden Erfindungsbeschreibung sowie auch aus den Figuren.The object is achieved by the casting mold according to the invention of claim 1. That is, the invention now provides a further, particularly advantageous casting mold with the features mentioned in claim 1, which has at least one core without the otherwise usual drafts or drafts having. Advantageous developments of the casting mold according to the invention result from the dependent patent claims, the following description of the invention and also from the figures.
Die erfindungsgemäße Gießform bzw. Gussform zur Herstellung eines metallischen Gussteils, welches einen hohlzylindrischen Bereich mit einer zylindrischen Innenkontur aufweist, umfasst:
- einen Formhohlraum, der den Abmessungen des (herzustellenden) Gussteils entspricht; und
- wenigstens einen zumindest teilweise im Formhohlraum angeordneten bzw. in den Formhohlraum hineinreichenden Kern zur Abbildung der Innenkontur, wobei dieser Kern kein loser Kern, sondern ein (baulicher) Bestandteil bzw. Werkzeugteil der Gießform ist. Erfindungsgemäß ist vorgesehen, dass der Kern mehrteilig ausgebildet ist und mehrere bewegliche Kernsegmente sowie einen längsverschieblich zwischen den Kernsegmenten angeordneten Dorn aufweist, wobei die Kernsegmente beim Längsverschieben des Dorns quer zur Bewegungsrichtung des Dorns bewegt bzw. verschoben werden und durch Ausfahren des Dorns in eine Gießstellung bringbar sind und durch Einfahren des Dorns in eine Entformungsstellung bringbar sind.
- a mold cavity corresponding to the dimensions of the casting (to be produced); and
- at least one core arranged at least partially in the mold cavity or extending into the mold cavity for imaging the inner contour, this core not being a loose core but a (structural) component or tool part of the casting mold. According to the invention, the core is designed in several parts and has a plurality of movable core segments and a mandrel that can be displaced longitudinally between the core segments, the core segments being moved or displaced transversely to the direction of movement of the mandrel when the mandrel is longitudinally displaced and can be brought into a casting position by extending the mandrel are and can be brought into a demolding position by retracting the mandrel.
Bei der erfindungsgemäßen Gießform (Gießwerkzeug) handelt es sich insbesondere um eine Kokille zum Kokillengießen oder um eine Druckgieß- bzw. Druckgussform zum Druckgießen von Metallen, insbesondere Leichtmetallen. Die Erfindung ist aber auch für andere Metallgießverfahren geeignet, bei denen Dauerformen eingesetzt werden.The casting mold (casting tool) according to the invention is in particular a chill mold for chill casting or a die-casting or die-casting mold for die-casting metals, in particular light metals. However, the invention is also suitable for other metal casting processes in which permanent molds are used.
Sowohl der Dorn als auch die Kernsegmente sind Bestandteile der Gießform und bilden einen Dauerkern. Der Dorn ist in seiner Längs- bzw. Axialrichtung verschiebbar und kann mithilfe eines geeigneten Antriebs ausgefahren und eingefahren werden, was vergleichsweise einfach zu bewerkstelligen ist. Beim Ausfahren wird der Dorn in Richtung des Formhohlraums vorbewegt bzw. vorgedrückt. Beim Einfahren wird der Dorn in die entgegengesetzte Richtung (d. h. aus dem Formhohlraum heraus) zurückbewegt bzw. zurückgezogen. Beim Ausfahren des Dorns werden die Kernsegmente quer, insbesondere im Wesentlichen senkrecht, zur Bewegungsrichtung des Dorns nach außen bewegt und nehmen eine Gießstellung bzw. Gießposition ein. Der Kern wird dabei quasi aufgeweitet und nimmt die Gestalt der abzubildenden Innenkontur an. Beim Einfahren des Dorns werden die Kernsegmente quer zur Bewegungsrichtung des Dorns nach innen bewegt und nehmen eine Entformungsstellung bzw. Entformungsposition ein, wobei sich der Kern quasi im Querschnitt verkleinert bzw. verengt und ohne Formschrägen bzw. Zugschrägen ein Entformen des hergestellten Gussteils ermöglicht wird. Für die Innenkontur sind somit nur geringe Bearbeitungsaufmaße erforderlich, wodurch einerseits der Nachbearbeitungsaufwand reduziert sowie der Materialverbrauch gesenkt und andererseits die Gefahr für Fehlstellen verringert werden.Both the mandrel and the core segments are part of the mold and form a permanent core. The mandrel can be moved in its longitudinal or axial direction and can use a suitable drive can be extended and retracted, which is comparatively easy to do. As it extends, the mandrel is advanced or pushed toward the mold cavity. During retraction, the mandrel is moved back or withdrawn in the opposite direction (ie, out of the mold cavity). When the mandrel is extended, the core segments are moved outwards transversely, in particular essentially perpendicularly, to the direction of movement of the mandrel and assume a casting position. The core is quasi expanded and takes on the shape of the inner contour to be imaged. When the mandrel is retracted, the core segments are moved inwards transversely to the direction of movement of the mandrel and assume a demoulding position, whereby the cross-section of the core is reduced or narrowed, so to speak, and demoulding of the cast part produced is made possible without drafts or draft angles. Only small machining allowances are therefore required for the inner contour, which on the one hand reduces the post-processing effort and material consumption and on the other hand reduces the risk of defects.
Der Dorn ist zentral angeordnet und die Kernsegmente sind um den Dorn herum angeordnet. Dies ermöglicht einen kompakten Kernaufbau und gewährleistet eine effektive Funktion.The mandrel is centrally located and the core segments are arranged around the mandrel. This enables a compact core structure and ensures effective function.
Der Dorn und die Kernsegmente sind mit komplementären Schrägflächen ausgebildet, die einen Keilschiebermechanismus bilden. Keilschiebermechanismen sind in diversen Ausführungen aus dem Werkzeugbau bekannt. Der Dorn kann bspw. einen konischen bzw. kegelstumpfförmigen Abschnitt aufweisen, auf dem die mit entsprechenden Komplementärflächen ausgebildeten Kernsegmente abgleiten können und dadurch quer zur Bewegungsrichtung des Dorns verschoben werden. Die Kernsegmente können mittels Federn gegen den Dorn vorgespannt sein. Die Federn, wobei es sich insbesondere um Druckfedern (Spiralfedern) handelt, gewährleisten einen Berührungskontakt zwischen den Kernsegmenten und dem Dorn und können zudem auch die Rückstellung (Rückholung) der Kernsegmente (in die Entformungsstellung) bewirken. Die Rückstellung kann auch hydraulisch, pneumatisch oder mechanisch (z. B. mittels Regenschirmmechanismus oder anderem geeigneten Gelenksystem) erfolgen.The mandrel and core segments are formed with complementary ramps that form a wedge slide mechanism. Wedge slide mechanisms are known in various designs from toolmaking. The mandrel can, for example, have a conical or frustoconical section, on which the core segments formed with corresponding complementary surfaces can slide and are thereby displaced transversely to the direction of movement of the mandrel. The core segments can be spring-loaded against the mandrel. The springs, which are in particular compression springs (coil springs), ensure physical contact between the core segments and the mandrel and can also cause the return (return) of the core segments (to the demoulding position). The reset can also be hydraulic, pneumatic or mechanical (e.g. by means of an umbrella mechanism or other suitable linkage system).
Bevorzugt sind die Kernsegmente mittels Nutführungen oder dergleichen bewegungsgeführt. Die Kernsegmente können bspw. mittels eines oder mehrerer Nutensteine in dafür vorgesehenen Nuten gelagert sein. Die Nutführungen können auch mit Endanschlägen, die die Bewegungen der Kernsegmente begrenzen, ausgebildet sein.The movement of the core segments is preferably guided by means of slot guides or the like. The core segments can, for example, be mounted in grooves provided for this purpose by means of one or more sliding blocks. The groove guides can also be designed with end stops that limit the movements of the core segments.
Die Kernsegmente können Formelemente aufweisen, die die Abbildung einer hinterschnittigen Innenkontur ermöglichen. Damit können bereits beim Gießen an der Innenkontur des Gussteils Hinterschnitte erzeugt werden, die mit konventionellen Dauerkernen oder Schiebern nicht mehr entformbar wären.The core segments can have shape elements that enable the depiction of an undercut inner contour. This means that undercuts can already be created during casting on the inner contour of the cast part, which would no longer be demouldable with conventional permanent cores or slides.
Es ist vorgesehen, dass das herzustellende Gussteil einen hohlzylindrischen Bereich aufweist, dessen zylindrische Innenkontur mit dem mehrteiligen Kern abgebildet wird, wobei dieser Kern drei oder auch mehr bewegliche Kernsegmente aufweist und der Dorn mit drei oder auch mehr Taschen ausgebildet ist, in denen diese Kernsegmente querbeweglich angeordnet sind. Außerdem weist der Dorn drei oder auch mehr sich radial erstreckende Stege bzw. Radialstege auf, die sich (in Längs- und Radialrichtung) zwischen den Taschen erstrecken, wobei die (radialen) Außenflächen dieser Radialstege zusammen mit den (radialen) Außenflächen der in Gießstellung befindlichen Kernsegmente die abzubildende Innenkontur vorgeben bzw. definieren. Die (radialen) Außenflächen der Radialstege sind bevorzugt mit Zugschrägen ausgebildet, damit der Dorn einfacher eingefahren bzw. zurückgezogen werden kann.It is envisaged that the cast part to be produced has a hollow-cylindrical area, the cylindrical inner contour of which is reproduced with the multi-part core, this core having three or more movable core segments and the mandrel being designed with three or more pockets in which these core segments can be moved transversely are arranged. In addition, the mandrel has three or more radially extending ridges extending (longitudinally and radially) between the pockets, the outer (radial) surfaces of these radial ridges together with the outer (radial) surfaces of those in the pouring position Core segments specify or define the inner contour to be mapped. The (radial) outer surfaces of the radial webs are preferably designed with draft bevels so that the mandrel can be inserted or withdrawn more easily.
Die erfindungsgemäße Gießform wird bevorzugt zur Herstellung eines Statortopfs für eine E-Maschine verwendet, wofür insbesondere eine Aluminium- oder Magnesiumgusslegierung eingesetzt wird. Gleichwohl ist die Erfindung nicht hierauf beschränkt.The casting mold according to the invention is preferably used to produce a stator pot for an electric machine, for which purpose a cast aluminum or magnesium alloy is used in particular. However, the invention is not limited to this.
Die Erfindung wird nachfolgend beispielhaft und in nicht einschränkender Weise mit Bezug auf die Figuren näher erläutert. Die in den schematischen und nicht-maßstabsgerechten Figuren gezeigten und/oder nachfolgend erläuterten Merkmale können, auch unabhängig von konkreten Merkmalskombinationen, allgemeine Merkmale der Erfindung sein und die Erfindung entsprechend weiterbilden.
- Fig. 1
- zeigt in einer Schnittdarstellung eine erfindungsgemäße Druckgießform mit einem mehrteiligen Kern, dessen Kernsegmente sich in ihren Gießstellungen befinden.
- Fig. 2
- zeigt eine Querschnittsdarstellung des zur Druckgießform der
Fig. 1 gehörenden Kerns. - Fig. 3
- zeigt die Druckgießform aus
Fig. 1 , wobei sich die Kernsegmente nun in ihren Entformungsstellungen befinden. - Fig. 4
- zeigt in einer perspektivischen Darstellung den zum Kern der
Fig. 2 gehörenden Dorn.
- 1
- shows a sectional view of a die-casting mold according to the invention with a multi-part core, the core segments of which are in their casting positions.
- 2
- shows a cross-sectional view of the die for the
1 belonging core. - 3
- shows the die
1 , with the core segments now in their demoulding positions. - 4
- shows a perspective view of the core of
2 belonging thorn.
Die in
Bei dem Druckgussteil 200 handelt es sich z. B. um einen dünnwandigen Statortopf zur Aufnahme von Statorblechpaketen in einer E-Maschine für den Fahrantrieb (E-Antrieb) eines Kraftfahrzeugs. Einerseits ist das Druckgussteil 200 in Bezug auf seinen Durchmesser (z. B. > 200 mm) vergleichsweise dünnwandig (z. B. < 5 mm). Andererseits werden an das Druckgussteil 200 hohe mechanische Anforderungen gestellt. Die üblicherweise vorzusehenden Formschrägen an der äußeren Kavitätswand und an der inneren Kavitätswand führen abhängig vom Schrägungswinkel zu hohen und ungleichen Wanddicken, wodurch eine erhöhte Gefahr für Fehlstellen besteht.The die-
Bei der erfindungsgemäßen Druckgießform 100 ist der Kern 140 mehrteilig ausgebildet und weist mehrere querbewegliche Kernsegmente 146 sowie einen längs- bzw. axialverschieblich zwischen diesen Kernsegmenten 146 angeordneten Dorn 141 auf. Der Dorn 141 ist, wie aus
Beim Ausfahren des Dorns 141, wozu dieser wie in
Nachdem der Formhohlraum 130 mit Schmelze befüllt ist, wird der Dorn 141, noch bevor das Druckgussteil 200 seine Entformungstemperatur erreicht hat (um die Aufschrumpfkräfte klein zu halten), eingefahren, wozu dieser, wie in
Wie vorausgehend erläutert, werden die Kernsegmente 146 durch Ausfahren des Dorns 141 quer zur Bewegungsachse L des Dorns 140 verschoben und in eine Gießstellung gebracht, wie in
- 100100
- Gießformmold
- 110110
- Formhälftemold half
- 119119
- Nutgroove
- 120120
- Formhälftemold half
- 130130
- Formhohlraummold cavity
- 140140
- Kerncore
- 141141
- Dornmandrel
- 142142
- Konuscone
- 143143
- Radialstegradial bar
- 144144
- Außenfläche (am Radialsteg)Outer surface (at the radial web)
- 145145
- Taschepocket
- 146146
- Kernsegmentcore segment
- 147147
- Außenfläche (am Kernsegment)Outer surface (on the core segment)
- 148148
- Formelementfeature
- 149149
- Nutensteinslot nut
- 150150
- FederFeather
- 200200
- Gussteilcasting
- LL
- Längsrichtunglongitudinal direction
- RR
- Radialrichtungradial direction
- SS
- Spaltgap
Claims (7)
- Casting mould (100) for producing a metallic cast part (200) which has a hollow-cylindrical region with a cylindrical inner contour, comprising:- a mould cavity (130) which corresponds to the dimensions of the cast part (200); and- at least one core (140), which is arranged in the mould cavity (130), for mapping of the inner contour, wherein this core (140) is a constituent part of the casting mould (100);wherein the core (140) is of multi-part form and has a plurality of movable core segments (146) and a mandrel (141) which is arranged so as to be longitudinally displaceable between the core segments (146),wherein the mandrel (141) is arranged centrally and the core segments (146) are arranged around the mandrel (141),wherein the mandrel (141) and the core segments (146) are formed with complementary oblique surfaces which form a wedge-type slide mechanism,wherein, during the longitudinal displacement of the mandrel (141), the core segments (146) are displaced transversely with respect to the movement direction of the mandrel (141) and can be brought into a casting position by extending of the mandrel (141) and can be brought into a demoulding position by retracting of the mandrel (141),wherein the multi-part core (140), with which the inner contour is mapped, has three or more movable core segments (146) and the mandrel (141) is formed with three or more pockets (145) in which these core segments (146) are arranged in a transversely movable manner,wherein the mandrel (141) also has three or more radial webs (143) which extend between the pockets (145), wherein the outer surfaces (144) of these radial webs (143) predefine, together with the outer surfaces (147) of the core segments (146) in the casting position, the inner contour to be mapped.
- Casting mould (100) according to Claim 1, characterized in that
the core segments (146) are preloaded against the mandrel (141) by means of springs (150). - Casting mould (100) according to either of the preceding claims,
characterized in that
the core segments (146) are guided in movement by means of groove guides (119, 149). - Casting mould (100) according to one of the preceding claims,
characterized in that
the core segments (146) are formed with mould elements (148) which allow an undercut inner contour to be mapped. - Casting mould (100) according to one of the preceding claims,
characterized in that
the outer surfaces (144) of the radial webs (143) are formed with pull slopes. - Casting mould (100) according to one of the preceding claims,
characterized in that
the mandrel (141) is manufactured in one piece. - Use of a casting mould (100) according to one of the preceding claims for production of a stator pot for an electric machine.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018217546.2A DE102018217546A1 (en) | 2018-10-12 | 2018-10-12 | Casting mold for producing a casting, which has at least one inner contour |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3636365A1 EP3636365A1 (en) | 2020-04-15 |
EP3636365B1 true EP3636365B1 (en) | 2022-06-22 |
Family
ID=68072215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19200013.1A Active EP3636365B1 (en) | 2018-10-12 | 2019-09-27 | Casting mould for manufaturing a casting part by having at least one internal contour and the use of such mold |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3636365B1 (en) |
CN (1) | CN111036846B (en) |
DE (1) | DE102018217546A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020106059A1 (en) | 2020-03-06 | 2021-09-09 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a cast component and casting station |
DE102022209863A1 (en) | 2022-09-20 | 2024-03-21 | Volkswagen Aktiengesellschaft | Method for producing a stator assembly with a cooling structure |
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DE7306433U (en) * | 1974-10-17 | Krauss Maffei Ag | Injection molding tool for manufacturing rectangular hollow bodies with circumferential undercuts | |
CH215180A (en) * | 1939-02-24 | 1941-06-15 | Elektromotorenfabrik H Loher & | Process for the manufacture of stands for electrical machines. |
FR1370603A (en) * | 1963-04-05 | 1964-08-28 | Renault | Semi-automatic machine for the shell molding of hollow parts such as pistons |
DE1937875U (en) * | 1966-03-11 | 1966-05-05 | Krauss Maffei Ag | INJECTION MOLD FOR THERMOPLASTIC PLASTICS PROCESSING INJECTION MOLDING MACHINES. |
DE2619064C3 (en) * | 1976-05-03 | 1980-03-20 | Geyer Werkzeugbau Gmbh & Co Kg, 5880 Luedenscheid | Mold core for the manufacture of molded parts |
FR2409843A1 (en) * | 1977-11-29 | 1979-06-22 | Michelin & Cie | MOLD FOR OBJECTS WITH LOCKED PARTS |
JPS56118833A (en) * | 1980-02-26 | 1981-09-18 | Toshiba Mach Co Ltd | Mold for forming |
US4286766A (en) * | 1980-04-18 | 1981-09-01 | Holdt J W Von | Collapsible mold core |
JPS5938032A (en) * | 1982-08-27 | 1984-03-01 | Hitachi Ltd | Mold for forming mirror cylinder for optical device |
JPS59150715A (en) * | 1983-02-16 | 1984-08-29 | Daiichi Gaiyaa Kk | Mold material |
US4731014A (en) * | 1986-03-12 | 1988-03-15 | Holdt J W Von | Rear opening mold |
JPH0614998Y2 (en) * | 1988-03-31 | 1994-04-20 | 山村硝子株式会社 | Mold |
SE505233C2 (en) * | 1990-07-20 | 1997-07-21 | Hans Mueller | Device for maneuvering jaws, cores and the like contained in compression and injection molding tools |
US5403179A (en) * | 1993-10-29 | 1995-04-04 | Ramsey; William C. | Collapsible mold core assembly |
DE19745516C2 (en) * | 1997-10-15 | 2000-09-07 | Rkt Rodinger Kunststoff Techni | Multi-part core |
US20060188601A1 (en) * | 2005-02-18 | 2006-08-24 | Mr. Garry Zydron | Collapsible core using two sleeves and is spring loaded |
CN2868641Y (en) * | 2005-12-12 | 2007-02-14 | 天津理工大学 | Contraction internal core-drawing device for plastic mould |
DE102010004227B4 (en) * | 2010-01-09 | 2011-09-01 | Poschmann Holding Gmbh & Co. Kg | Method and device for demolding injection molded hollow bodies with undercuts in the inner contour |
DE102011011784B4 (en) * | 2011-02-19 | 2013-02-07 | Roth Gmbh Plastic + Form | Incidence core for injection molds with optimized incidence ratio |
CN102225602B (en) * | 2011-04-14 | 2013-05-08 | 厦门唯科模塑科技有限公司 | Core pulling device for undercut inner hole |
CN203739149U (en) * | 2014-03-13 | 2014-07-30 | 常州机电职业技术学院 | Core-pulling device for small-diameter inward-shrinkage sliding block |
FR3022483B1 (en) * | 2014-06-19 | 2017-01-20 | Infiplast | RETRACTABLE CORE SYSTEM FOR MOLDING WORKPIECES |
DE102015216224A1 (en) * | 2015-08-25 | 2017-03-02 | Volkswagen Aktiengesellschaft | Mold with integrated core bearing bolts and method of making a cast component |
DE102015220980A1 (en) * | 2015-10-27 | 2017-04-27 | Zf Friedrichshafen Ag | Mold with multi-part slide for the production of metallic cast components, thus executable casting method and hereby produced planet carrier |
DE102017103152A1 (en) * | 2016-03-01 | 2017-09-07 | Ksm Castings Group Gmbh | Casting tool and method for positioning and removal of a slide within the casting tool |
CN206426322U (en) * | 2017-02-04 | 2017-08-22 | 东莞市弘研精密模具有限公司 | Flexible cored structure |
CN206484836U (en) * | 2017-02-21 | 2017-09-12 | 中亿腾模塑科技(苏州)有限公司 | A kind of male model applied to plastic mould inside contracts cored structure |
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-
2018
- 2018-10-12 DE DE102018217546.2A patent/DE102018217546A1/en not_active Withdrawn
-
2019
- 2019-09-27 EP EP19200013.1A patent/EP3636365B1/en active Active
- 2019-10-12 CN CN201910966836.XA patent/CN111036846B/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN111036846B (en) | 2022-07-22 |
EP3636365A1 (en) | 2020-04-15 |
DE102018217546A1 (en) | 2020-04-16 |
CN111036846A (en) | 2020-04-21 |
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