• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method or casting tool for producing a cast workpiece (2), in particular a cast wheel, wherein a core (3) remaining in the cast workpiece (2) is inserted into a casting tool (1) having at least one lower mold part (5) and one upper mold part (4) is moved relative to each other for closing the casting tool (1), wherein the core (3) is positioned by means of at least one with the core (3) connected to the positioning element (7) in a predetermined position in the casting tool (1), wherein the positioning element (7) when positioning the core (3) in the casting mold (1) on a preferably in operation substantially horizontally arranged bearing surface (8) of the lower mold part (5) of the casting mold (1) is placed so that the core (3) below the action of gravity is positioned in the predetermined position.
    公开号:AT510737A1
    申请号:T2006/2010
    申请日:2010-12-02
    公开日:2012-06-15
    发明作者:
    申请人:Borbet Austria Gmbh；
    IPC主号:
    专利说明:

    1
    The invention relates to a method for producing a cast workpiece, in particular a cast wheel, wherein a core remaining in the cast workpiece is inserted into a casting tool having at least one lower mold part and one upper mold part, which are moved relative to each other for closing the mold, wherein the core by means of at least a positioning element connected to the core is positioned in a predetermined position in the casting tool. The invention further relates to a casting tool for producing a cast workpiece, in particular a cast wheel, with at least one lower molded part and one upper molded part, which are movable relative to each other for closing the casting tool.
    From AT 409 728 B a method for producing a wheel-cast rim is known, in which a preformed metal foam core part is inserted into a casting tool having a Kokillenoberteil, a Kokillenunterteil and lateral core slider. The core part is fixed in position using positioning elements and then cast in a light metal. For discharging gases which escape during the casting over of the core part, the casting tool or the positioning element has a ventilation opening. The remaining in the casting wheel Positionie-relomento are fixed to the core. For centering of the core part in the casting tool, the positioning elements with the movable Kokilienoberteil in a selbstk.l.emmende connection. For this purpose, the positioning element has a conical lateral surface, which causes the self-clamping effect by abutment with a shoulder forming a cross-sectional constriction in the vent opening of the mold upper part. This technique has proven to be particularly useful to keep the core part with Po-s.i ti onierelementen in the predetermined pitch, when the positioning can be attached to ribs of the core part, which protrude from an annular outer part radially inwardly. In this embodiment, the positioning members protruding axially from the ribs may be jammed in the mating vent opening of the mold top 1s. In many cases, however, it is not possible to provide such a connection. This is particularly the case when the core part has no radially inwardly projecting ribs, on which the positioning elements are attached. 2 * · * »··· ** ·» * * ··· * «·« * · · « ············································. Accordingly, it would be particularly desirable to enable accurate positioning of the core even when the core has no ribs projecting into the wheel spokes.
    Accordingly, the object of the present invention is to provide a method or a casting tool of the type mentioned, which ensures an exact positioning of the core in the casting tool with the greatest possible freedom for the design of the core.
    This is achieved in the method of the initially mentioned type in that the positioning is placed when positioning the core in the casting mold on a preferably in operation substantially horizontally arranged bearing surface of the lower mold part of the casting mold, so that the core under the action of gravity in the is positioned predetermined position.
    For positioning the core in the casting tool, therefore, the positioning element is placed on the corresponding bearing surface of the lower molding of the casting tool. In this position, the core is positioned under the action of gravity contactless to the Formlei len of the casting tool. The holder of the core is thus carried out in particular on the weight of the core, so that a stable support on the support surface is achieved. Accordingly, it is not necessary to provide a clamping connection between the positioning element and the associated molding of the casting tool for centering the core. The positioning element is expediently placed on a bearing surface which is arranged essentially horizontally with respect to its operating position. However, depending on the design, it would also be conceivable to provide a relative to the horizontal inclined support surface, but it should be ensured that the core by gravity in a stabi LOR. Position is held relative to the mold parts of the casting tool.
    For precise positioning of the core, it is advantageous if the Positioniereiemenl is clamped when closing the casting tool between the support surface of the lower Forinteil s and a corresponding contact surface of the upper mold part. At the
    Position of the cast workpiece, the core is first placed on the support surface of the lower mold part before the mold parts are moved toward each other for closing the casting tool, wherein the positioning element is clamped between the corresponding contact surfaces of the casting tool. As a result, the core is secured against slipping during the casting process, so that the core is arranged with high accuracy in the desired position in the finished casting workpiece.
    In order to position the core in the predetermined position in the casting tool, it is favorable if a pin-shaped, bow-shaped or plate-shaped end region of the positioning element projecting from the core is placed on the bearing surface of the lower molding part. The other end region of the positioning element is preferably fixed in the core in a friction-locked and / or force-locking manner. The shape of the protruding from the core end portion determines the contact surface with the support surface of the lower mold part. In the case of a pin-shaped end region of the positioning element, a comparatively small contact surface is provided; In contrast, the contact between the positioning element and the support surface can be increased by means of the plate-shaped end region.
    In a particularly preferred embodiment of the invention, provision is made for an end region, protruding from a circumferential rim of the core, in particular radially inwardly, to be placed on the bearing surface of the lower molding. When casting around the core with a light metal, a cast piece is formed, which encloses the ring, in particular circularly encircling. This method is particularly useful for producing a cast wheel, in which the core is arranged substantially completely in a circumferential rim flange. For the formation of the cast wheel, it is particularly advantageous if the collar has in particular radially inwardly projecting pockets, which may optionally extend into the spokes of the casting wheel.
    For exact positioning of the core in the casting tool, it is advantageous if a plurality of spaced circumferentially 4 Λ Support surfaces of the lower mold part are placed. In order to support the core evenly on the lower mold part, it is particularly advantageous if the
    Positioning elements are arranged at substantially regular angular intervals on the circumferential rim. Of course, however, the positioning elements may be located anywhere, i. without a compulsory uniform distribution, be positioned at the core. When inserting the core into the casting tool, the positioning elements are placed on the matching bearing surfaces of the lower molding.
    In order to avoid adverse effects by the remaining in the casting workpiece positioning, it is advantageous if a protruding from the finished cast workpiece end of the positioning removed, in particular cut or -rotated.
    To avoid corrosion, which could occur in earlier methods at the exit points of the positioning, it is advantageous if the cast workpiece is painted or powdered at least in the region of the cut end of the PosiLionierelements. In a preferred embodiment, the entire cast workpiece is finally painted to minimize the risk of corrosion as far as possible.
    When casting tool of the initially mentioned type, the object underlying the invention is achieved in that the lower mold part is provided with a bearing surface having a survey on which a core connected to a positioning element can be placed so that the core without contact to the moldings in the casting mold is positionable. Accordingly, the same advantages can be achieved with the casting tool according to the invention as with the described method, so that in order to avoid repetition reference is made to the above statements.
    For producing a cast workpiece with a circular peripheral portion, in particular for the production of a cast wheel, it is advantageous if a circular encircling elevation is provided, which is formed as a portion of a cavity enclosing boundary surfaces. The shape of the finished casting workpiece is fixed by the cavity enclosed by the boundary surfaces.
    For stable positioning of the core in the predetermined position, it is advantageous if the support surface is arranged substantially horizontally in operation. The arrangement of the support surface ensures that the core is held without contact at least to the lower mold part under the action of gravity. This can be achieved in principle by a tilted at a shallow angle bearing surface depending on the version.
    In order to secure the core in the predetermined position against lateral slippage, it is advantageous if the upper mold part and / or the lower mold part have a groove. The shape of the groove preferably corresponds to the outer contour of the positioning element inserted in the groove, so that the positioning element can not deflect laterally when the core is being overmolded with a light metal.
    In order to prevent the core from being undesirably displaced in any direction in space when it is cast with a metal, it is advantageous if the groove (s) of the upper and lower molds are or are formed in a closed position of the casting tool in that the positioning element projecting from the core is clamped in or in the groove (on). The positioning element clamped in the groove can not escape from the predetermined position even under high load, so that the core is arranged with high precision in the desired position in the cast workpiece.
    In order to form a cavity in the casting mold which images the shape of the finished cast workpiece, it is advantageous if sealing surfaces are provided between the upper and lower molds, the bearing surface being formed as a section of the sealing surface of the lower molded part. Accordingly, the sealing surface of the lower molded part has the support surface arranged horizontally, in particular during operation, as a result of which the positioning of the support element is prevented. * * * f * *
    Kerns in the casting tool is greatly facilitated.
    The invention will be explained below with reference to Figures gezeig th embodiments, to which, however, it should not be limited. In detail, in the drawing:
    Fig. 1 is a cross-sectional view of a portion of a casting tool receiving a core cast from a light metal;
    Figure 2a is a front view of the core, wherein bow-shaped positioning elements are attached to a circumferential ring.
    Fig. 2b shows the detail illustrated in Fig. 2a with a circle in contrast enlarged scale;
    Fig. 3 is a sectional view of the core taken along the line C-C in Fig. 2b;
    Fig. 4a is a view of a portion of the core, which is connected according to a Wei direct execution with a plate-shaped end portion on facing position: erelement;
    Fig. 4b shows the detail illustrated in Fig. 4a with a circle in contrast to an enlarged scale;
    Fig. 5a is a view of a portion of the core, which is connected according to a Wei direct embodiment with a pin-shaped positioning; and
    Fig. 5b illustrates the detail illustrated in Fig. 5a with a circle in contrast enlarged scale.
    FIG. 1 shows a section of a casting tool 1 for producing a cast workpiece 2. In the embodiment shown, a light metal rim or a cast wheel 2 'is produced for a motor vehicle. In the casting mold 1, a core 3 is taken, which has a lower density than a light metal alloy with which the core 3 is cast to form the cast wheel 2 '. The core 3 is preformed from a pressed body fr / per, for example from porous silicate material, in particular from vermiculite; the core 3 may alternatively consist of a metal foam or any other material. By receiving the a comparatively low density auf-facing core 3 in the casting wheel 2 ', a weight saving can be achieved. As can be seen from FIG. 1, the casting tool 1 is in the form of a mold having an upper molded part 4 and a lower molded part 5. In addition, the casting tool 1, for example, four circumferentially adjoining core slide 6. To close the casting tool 1, the upper mold part 4 is moved toward the lower mold part 5, wherein the lateral core slide 6 are moved radially inwardly until it rests against the lower mold part 5. In order to position the core 3 in a predetermined position in the casting tool 1, a positioning element 7 is provided, which is connected to the core 3. The positioning element 7 makes it possible to arrange the core 3 without contact with the mold parts 4, 5 when inserting it into the casting tool 1, before the core 3 is encapsulated with the light metal alloy. When introducing the light metal alloy, the core 3 is encapsulated on all sides by the light metal alloy.
    In known methods for producing cast wheels 2, a self-clamping connection between the positioning element 7 and the upper molded part 4 has often been produced for centering the core 3 in the casting tool. The core 3 shown has, however, a comparatively short extent in the axial direction, so that the core 3 does not extend below the upper mold part 4. Accordingly, it is not possible in this embodiment, make a positioning of the core 3 via a self-locking connection with the upper mold part 4.
    In order to achieve an exact positioning of the core 3 shown here in the predetermined pitch, the positi on.ier element 7 is placed when positioning the core 3 in the casting mold 1 on a support surface 8 of the lower mold part 5. The core 3 is thus held under the action of gravity berührur.gs-free to the mold parts 4, 5 in the predetermined position. The support surface δ is arranged horizontally relative to an operating position of the casting tool 1. The lower mold part 5 has a circular encircling elevation 9, whose saddle- »« • f 4 <
    surface comprises the bearing surface 8. Cie elevation 9 'has flanks 10, 11, which connect radially outwardly or radially inwardly to the horizontal bearing surface 8. The support surface 8 and seen in the radial direction inner edge 10 of the elevation 9 are formed as sections of sealing surfaces 12 between the correspondingly shaped mold parts 4, 5. The outer edge 11 seen in the radial direction is concavely curved according to the shape of the finished rim bed. The flank 11 thus forms a section of boundary surfaces 13 which enclose a cavity 14 which images the shape of the cast wheel 2 '. The support surface 8 of the lower mold part 5 has a groove 16, in which the positioning element 7 is inserted. When closing the casting tool 1, the positioning element 7 is clamped between the support surface 8 of the lower mold part 5 and a facing contact surface of the upper mold part 4, to secure the core 3 on all sides against slipping.
    From Fig. 1 is further seen that the resting on the support surface 8 end of the positioning 7 protrudes from the finished cast wheel 2 '. After the core 3 has been cast in, the projecting end of the positioning element 7 is cut off
    Prevention of corrosion, the cast wheel 2 'then at least in the region of the cut end of the posit i. on i erele-ments 7 lacquered; Expediently, the entire cast wheel 2 'is provided with a coating.
    In Figs. 2a and 2b, an embodiment of the core 3 is shown which a circular encircling ring 17 vorsiehL having radially inwardly projecting pockets 18. In the embodiment shown in Fig. 1, a total of four distributed over the circumference of the ring 3 Positionierelernente 7 are provided, which are fixed frictionally or non-positively on the rim 17. The free end portions of the positioning 7 are from the rim 17 radially inwardly from. When inserting the core 3 into the casting tool 1, the end regions of the positioning learning projecting from the core 3 are each placed onto a corresponding bearing surface 3 of the lower molding 5. According to FIGS. 2 a and 2 b, the positioning element 7 is bent over in a bow-shaped manner, the free ends of the legs of the bow-shaped positioning element 7 being fixed in the collar 17 of the core 3, 9 a ** »· ** · ·» · # «· »4 · · · · · · · # ··· ·· ·········································································································
    4a and 4b show an alternative embodiment of the positioning element 7, which has a plate-shaped end portion which is placed on the support surface 8.
    In the embodiments shown in FIGS. 5a and 5b, a pin-shaped positioning element 7 is provided. The fixation of the positioning element 7 in the core 3 can be done in a known manner positive or non-positive. For a frictional connection, the positioning element 7 expediently has a pointed end, which is pushed into the pre-perforated core 3.
    权利要求:
    Claims (13)
    [1]
    1. A method for producing a cast workpiece (2), in particular a cast wheel, wherein a in the cast workpiece (2) remaining core (3) in a casting mold (1) with at least one lower mold part (5) and an upper mold part (4) which are moved relative to one another for closing the casting tool (1), the core (3) being positioned in a predetermined position in the casting tool (1) by means of at least one positioning element (7) connected to the core (3) , characterized in that the positioning element (7) during the positioning of the core (3) in the casting tool (1) on a preferably in operation substantially horizontally arranged bearing surface (8) of the lower mold part (5) of the casting tool (1) is placed so that the core (3) is positioned under the action of gravity in the predetermined position.
    [2]
    2. The method according to claim 1, characterized in that the positioning element (7) during the closing of the casting tool (1) between the bearing surface (8) of the lower mold part (5) and a corresponding contact surface of the upper mold part (4) clamped. becomes.
    [3]
    3. The method according to claim 1 or 2, characterized in that from the core (3) outstanding pin-shaped, bow-shaped or plate-shaped end portion of the positioning element (7) on the support surface (8) of the lower mold part (5) is placed.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that ei.n of a circumferential rim (17) of the core (3) in particular substantially radially inwardly protruding end portion of the Positionlere 1ement (7) on the support surface (8) of the lower mold part (b) is placed.
    [5]
    5. ancestor according to claim 4, characterized in that a plurality of circumferentially spaced on the circumferential rim (17) of the core (3) fixed positioning elements (7) on corresponding bearing surfaces (8) of the lower mold part (5) are placed.
    [6]
    6. The method according to any one of claims 1 to 5, characterized in that a from the finished cast workpiece (2) projecting end of the positioning element (7) is removed.
    [7]
    7. The method according to claim 6, characterized in that the cast workpiece (2) at least in the region of the cut end of the positioning element (7) is painted or powdered.
    [8]
    8. casting tool (1) for producing a cast workpiece (2), in particular a cast wheel, with at least one lower mold part (5) and an upper mold part (4) which are movable relative to each other for closing the casting tool (1), characterized the lower molded part (5) is provided with a protrusion (9) having a bearing surface (8) on which a positioning element (7) connected to a core (3) can be laid so that the core (3) contacts without contact the mold parts (4, 5) in the casting mold (1) can be positioned.
    [9]
    9. casting tool (1) according to claim 8, characterized in that a circular encircling elevation (9) is provided, the al s section of a cavity (14) opening boundary surfaces (13) is ausgebi l.det.
    [10]
    10. casting tool (1) according to claim 8 or 9, characterized in that the Aufiageflache (8} is arranged substantially horizontally in operation.
    [11]
    11. casting tool (1) according to one of claims 8 to 10, characterized in that the upper mold part (4) and / or the lower Form¬! _L (b) have a groove (16).
    [12]
    12. Gjeßwerkzeug (l) according to claim 11, characterized in that the groove (s) (16) of the upper and lower mold part (4, 5) in a closed position of the casting tool (1) such., Is formed, or are, in that the positioning element (7) protruding from the core (3) is clamped in or in the groove (s) (16).
    [13]
    13. casting tool (1) according to one of claims 8 to 12, characterized in that sealing surfaces (12) between the upper (4) 12th

    Are provided with the lower mold part (5), wherein the support surface (8) is formed as a section of the sealing surface (12) of the lower mold part (5). .13 / ^
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    FR3088582B1|2018-11-20|2020-11-20|Commissariat Energie Atomique|Single-portion structured rim|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
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