EP0706429A1 - Dispostif et procede de prehension pour noyaux de fonderie, en particulier des noyaux de sole - Google Patents

Dispostif et procede de prehension pour noyaux de fonderie, en particulier des noyaux de sole

Info

Publication number
EP0706429A1
EP0706429A1 EP94915041A EP94915041A EP0706429A1 EP 0706429 A1 EP0706429 A1 EP 0706429A1 EP 94915041 A EP94915041 A EP 94915041A EP 94915041 A EP94915041 A EP 94915041A EP 0706429 A1 EP0706429 A1 EP 0706429A1
Authority
EP
European Patent Office
Prior art keywords
core
clamping
recess
wall
sole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94915041A
Other languages
German (de)
English (en)
Other versions
EP0706429B1 (fr
Inventor
Werner Landua
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.)
Adolf Hottinger Maschinenbau GmbH
Original Assignee
Adolf Hottinger Maschinenbau GmbH
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 Adolf Hottinger Maschinenbau GmbH filed Critical Adolf Hottinger Maschinenbau GmbH
Publication of EP0706429A1 publication Critical patent/EP0706429A1/fr
Application granted granted Critical
Publication of EP0706429B1 publication Critical patent/EP0706429B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/108—Installation of cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/18—Finishing

Definitions

  • the invention relates to a device for gripping a foundry core, in particular a sole core, with a clamping device having clamping means, the core having at least one recess, an opening, a passage or the like, into which the clamping device with the clamping means engages . Furthermore, the invention relates to a method for gripping a foundry core, in particular a sole core, using the device according to the invention.
  • the present invention relates to the field of foundry technology.
  • foundry cores or molds are usually produced in separate parts, brought together and connected to one another to form a casting mold or a core package.
  • the individual cores for example sole cores and water jacket cores for producing an engine block, have to be moved relative to one another, inserted into one another and possibly connected to other components before they are used to produce a bpsw. metallic workpiece, bpsw. of an engine block, are filled with molten metal.
  • the known devices of the type in question are so-called hole grippers which are used to engage recesses in foundry cores and molds, in particular in Sole and water jacket cores serve.
  • These hole grippers have a pressure chamber with an elastic outer wall as the clamping means, which is "inflated” hydraulically or pneumatically.
  • the outer wall of the hole gripper is pressed on all sides against the inner wall of the recess of the core, so that the core can be lifted due to the frictional engagement that is then present.
  • the hole grippers known from practice are problematic insofar as they press on all sides of the inner wall of the core from within the recess, which poses a considerable risk of damage to the core, in particular a thin sole core.
  • the deactivated and activated state there are only two operating states in the known hole grippers, namely the deactivated and activated state, so that adaptation to different wall thicknesses or sensitivities of the core to be gripped is not possible.
  • the hydraulically or pneumatically actuated hole grippers require very substantial sealing measures, the outer walls of the hole grippers which can be brought into engagement being usually made of rubber or a rubber-like material. This material is subject to considerable wear.
  • the present invention is therefore based on the object of designing and developing a device for gripping or handling a casting core, in particular a sole core, of the type in question in such a way that automatic handling of cores is possible with the simplest construction is, damage to the cores and excessive wear on the gripping device should at least be largely avoided.
  • a method for gripping a foundry core, in particular a sole core is to be specified using the device according to the invention, whereby in the context of this method in particular also the combination of a sole core with a component to be packaged, in particular especially a cylinder liner, and a further core, in particular a water jacket core, is possible.
  • the device according to the invention achieves the above object by the features of patent claim 1.
  • the device according to the invention for gripping a foundry core is designed in such a way that the clamping means are designed as clamping jaws which can preferably be pressed against the inner wall of the core.
  • a so-called inner gripping device can be constructed in the simplest way by designing the clamping means in the form of clamping jaws.
  • This measure alone avoids all-round application of force to the inner wall of the core to be gripped insofar as the clamping jaws only press against the inner wall of the core in predetermined areas.
  • the core is in no way pressed apart along the entire circumference, so that the risk of damage is considerably reduced.
  • the clamping jaws are preferably designed to be form-fitting, i.e. adapted to the contour of the inner wall of the core or sole core. If, in the case of a sole core, a cylindrical recess or a cylindrical passage is assumed, the clamping jaws with a corresponding radius are designed as circular segments and only act on the inner wall of the core in some areas.
  • the pressing force of the clamping jaws can be predetermined or adjusted.
  • This very special measure allows the pressing force to be adjusted, for example with regard to the wall thickness of the core to be gripped. Thin-walled and at the same time light cores are tensioned or gripped with correspondingly low pressing forces.
  • the clamping device comprises a cylinder-piston arrangement with a piston which can be displaced outwards or a piston rod which can be displaced outwards and a clamping wedge articulated thereon and extending between the clamping jaws.
  • the clamping jaws are actuated or pressed apart by a clamping wedge which can be inserted between the clamping jaws and are thus pressed in the direction of the inner wall of the core or against the inner wall of the core.
  • This clamping wedge is operatively connected to the cylinder-piston arrangement, so that the clamping wedge moves due to the movement of the piston.
  • This cylinder-piston arrangement moving the clamping wedge can work hydraulically or pneumatically.
  • the pressing force of the clamping jaws can be predetermined or controlled by pushing the clamping wedge into the area between the clamping jaws to different degrees.
  • the cylinder-piston arrangement, the clamping wedge and the clamping jaws are further advantageously arranged in a housing which can be inserted into the recess in the core, this housing ultimately defining the clamping device.
  • the exterior dimensions of the housing must be such that it just fits into the recess in the core. Consequently, the tensioning device is at least largely adapted to the recess of the respective core.
  • the clamping jaws acting on the inner wall of the core can be displaced through the housing, preferably orthogonally to the direction of movement of the clamping wedge — by moving the clamping wedge — outwards, ie in the direction of the inner wall of the core.
  • the clamping jaws it is advantageous if a total of two diametrically opposite clamping jaws, which are displaceable in the opposite direction from the housing in the direction of the inner wall of the core, are provided.
  • the core is subjected to force or pressure on opposite sides, so that all-round deformation of the core is avoided.
  • the deformation that occurs when the jaws are activated is unidirectional or uniaxial in the main components, so that the core is at least slightly deformed into an elliptical cross-sectional shape in the case of an annular cross section.
  • this deformation is always extremely slight, so that the core in no way breaks.
  • the contact surface of the clamping jaws which serves to bear against the inner wall of the core could be designed in the form of a segment of a circle. If an at least slight tilting of the clamping jaws is possible, these could optimally fit against the inner wall of the core, so that a selective application of force is avoided.
  • the clamping jaws can be pressed by means of the clamping wedge against a stop limiting the displacement of the clamping jaws.
  • This stop could be formed by an extension of the clamping jaws and the inner wall of the housing formed on the side facing away from the contact surface, so that when the clamping jaws are fully extended, the extension lies from the inside against the inner wall of the housing.
  • clamping wedge or the clamping jaws from a magnetized material or ferromagnetic material, so that the clamping jaws are retracted due to a magnetic effect.
  • the complete retraction of the clamping jaws is in any case of particular advantage insofar as the immersion of the clamping device is not hindered by protruding clamping jaws.
  • the clamping wedge rests with its wedge surfaces in a form-fitting and displaceable manner on the clamping jaws on their side facing away from the contact surface.
  • the wedge surfaces and / or the contact surfaces of the clamping jaws could be coated with a material that prevents friction, a so-called sliding aid.
  • the surfaces could have a silicone coating.
  • the tensioning device to be inserted into the core recess can be centered in the passage from the outset, so that an unequal application of force to the inner wall of the core is avoided.
  • the tensioning device could have a shoulder formed at the upper end of the tensioning device for insertion on the upper edge of the recess of the core and thus for centering or limiting the penetration depth of the tensioning device. With this shoulder, the tensioning device would then rest on the upper end of the core and, at the same time, center the tensioning device at the same time. Special positioning would therefore no longer be necessary.
  • the shoulder could have at least one step for engaging in the upper edge of the recess of the core and corresponding to the upper edge of the recess, so that due to the corresponding contours of the shoulder and the upper end of the core an almost positive interlocking is possible. So that the intervention is not hindered due to a small amount of play, the side surfaces or flanks used for the engagement could be conical, so that insertion is possible even when the tensioning device is not positioned exactly.
  • the method according to the invention for gripping a foundry core, in particular a sole core is characterized by the following method steps using the device discussed above:
  • the core is positioned with a preferably upwardly directed or upwardly open recess, so that the device according to the invention with the tensioning device can dip into the recess of the core. After this.
  • the tensioning device is immersed, the core is gripped on the inside by actuating the tensioning device with a prescribable contact pressure.
  • the tensioning device When the tensioning device is activated, the core can be raised and inserted into a component that is essentially adapted to the shape of the core, preferably into a cylinder liner, wherein there is at least slight play between the outer wall of the core and the inner wall of the component or the cylinder liner.
  • the component or the cylinder liner into which the sole core is to be inserted is provided positioned on a jig. Such a predetermined positioning favors the automatic operation or helps to avoid complex sensors.
  • the core or sole core could have a projection on the upper edge with a recess which is preferably circular or partial on the underside of the projection.
  • a core which is preferably circular in cross-section and which surrounds the component or the cylinder liner, in particular a so-called water jacket core, could then also be provided on the gauge, onto which the core or sole core coexists its projection is inserted into the component or into the cylinder liner during insertion. Consequently, the sole core would be introduced into the cylinder liner on the one hand and the water jacket core surrounding the cylinder liner would be fixed on the other hand.
  • the core serving end of the further core or the water jacket core could be formed in the form of preferably three circumferentially arranged feet. Furthermore, the end of the further core or of the water jacket core serving to engage the recess of the protrusion of the core or sole core, in particular the feet serving for insertion, could be provided with an adhesive at least at the end before insertion become. This adhesive serves to fasten the water jacket core to the projection of the sole core, the water jacket core surrounding the cylinder liner surrounding the sole core at a distance.
  • FIG. 1 is a schematic side view of a sole core
  • FIG. 2 in an enlarged representation the object from FIG. 1 in section along the line II-II, namely a sole core in cross section,
  • FIG. 3 shows a schematic representation of the sole core shown in FIGS. 1 and 2 in the form of representation chosen in FIG. 1, but with immersed clamping device and clamping jaws in the working position,
  • FIG. 6 in a cross section, schematically, the arrangement of FIGS. 4 and 5, wherein the sole core carried by the tensioning device according to FIG. 3 is inserted or plugged in and
  • FIG. 7 shows the object from FIG. 6, enlarged, in a schematic view from below.
  • FIGS. 3, 6 and 7 show a device in use for gripping a foundry core, this specifically being a sole core 1.
  • the device has a clamping device 3 having clamping means 2.
  • the sole core 1 in turn has a recess 4, wherein it specifically, this is a passage.
  • the clamping device 3 with the clamping means 2 engages in the recess 4.
  • the clamping means are designed as clamping jaws 2 which can be positively pressed against the inner wall 9 of the core 1.
  • FIGS. 3 and 6 also clearly show that the clamping device 3 comprises a cylinder-piston arrangement 5 with an outwardly displaceable piston rod 6 and a clamping wedge 7 which is articulated thereon and extends between the clamping jaws 2.
  • the cylinder-piston arrangement 5 works pneumatically.
  • FIGS. 3 and 6 also show that the cylinder-piston arrangement 5, the clamping wedge 7 and the clamping jaws 2 are arranged in a housing 8 which can be inserted into the recess 4 of the sole core 1.
  • the clamping jaws 2 are displaceable through the housing 8 orthogonally to the direction of movement of the clamping wedge 7 in the direction of the inner wall 9 of the sole core 2. This is done by moving the clamping wedge 7.
  • FIGS. 6 and 7 show together that a total of two diametrically opposed, mutually opposite directions from the housing 8 in the direction of the inner wall 9 of the sole core 1 are provided.
  • 7 shows that the recess 4 has a circular cross section.
  • the contact surface 10 of the clamping jaws 2, which serves to bear against the inner wall 9 of the sole core 1, is designed in the form of a segment of a circle.
  • the clamping jaws 2 can be pressed against a stop 11 which limits the displacement of the clamping jaws 2.
  • the stop 11 is through a side facing away from the contact surface 10 trained extension 12 and the inner wall 13 of the housing 8 formed. It is not shown in the figures that the clamping jaws 2 are moved back into the housing 8 by elastic retaining means when the clamping wedge 7 is pulled back.
  • the elastic means can also be designed as a gas application.
  • FIG. 7 shows very clearly that the clamping wedge 7 with its wedge surfaces 14 is in a form-fitting and thereby slidable manner against the clamping jaws 2 on the side facing away from the contact surface 10.
  • FIGS. 3 and 6 show that the tensioning device 3 is used at the upper end 16 of the upper end 15 of the recess 4 of the recess 4 of the sole core 1 and for centering and thus also limits the depth of penetration of the tensioning device 3
  • Has clamping device 3 trained shoulder 17 This shoulder 17 also has a step 18 which serves to engage in the upper edge 15 of the recess 4 and corresponds to the upper edge 15 of the recess 4.
  • This step 18 tapers with its side wall the area to be fitted into the sole core 1 by means of a conical cross section, so that the tensioning device 3 with its rear area, which has the shoulder 17, is virtually guided into the sole core 1.
  • the method according to the invention relates to the gripping and thus also to the handling of a foundry core, which is a sole core 1 in the exemplary embodiment selected here. Handling is done using the previously mentioned device.
  • the claimed method now has the following method steps:
  • the core 1 is positioned with the recess 4 pointing upwards or open upwards, as shown in FIGS. 1 and 2.
  • the tensioning device 3 is immersed in the recess 4 of the sole core 1, and in the case of several recesses 4, several tensioning devices 3 can also be provided.
  • the inside of the sole core 1 is gripped by actuating the tensioning device 3, specifically with a predetermined contact pressure.
  • the contact pressure of the clamping device 3 or the clamping jaws 2 is increased by the clamping wedge 7 until the sole core 1 presses against the inner wall 21 of the cylinder liner 19 due to elastic deformation and between the outer wall 20 of the sole core 1 and the inner wall 21 the cylinder liner 19 friction occurs.
  • the entire arrangement can then be lifted or moved and transported by means of the tensioning device 3 or a manipulator or the like carrying it and then subsequently installed, for example, in a core package.
  • Figures 4 and 5 show that the cylinder liner 19 is provided positioned on a jig 22. It is now essential that the sole core 1 has on its upper edge 15 a projection 23 with a recess 24 arranged on the underside of the projection 23. This recess 24 could, for example, have a circular ring shape, but could also only partially be in the form of partial circular rings.
  • a water jacket core 25, which is circular in cross-section and surrounds the cylinder liner 19, is now provided on the gauge 22, onto which the sole core 1 with its overhang 23 is pushed during the insertion into the cylinder liner 19 .
  • the end of the water jacket core 25 serving to engage the recess in the projection 23 of the sole core 1 is formed in the embodiment shown in FIG. 4 at least in the vicinity of a recess 4 in the form of three circumferentially arranged feet 26.
  • the end of the water jacket core 25, which is used to engage the recess 24 in the sole core 1, or the feet 26 which are used for insertion are provided with an adhesive on the end before insertion.
  • recesses or adhesive niches 27 are provided at the free end of the water jacket core 25, namely at the free end of the feet 26 used for insertion, so that adhesive or adhesive can be displaced and the insertion the feet 26 in the sole core 1 is not disabled.

Landscapes

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

Abstract

Un dispositif de préhension pour noyaux de fonderie, en particulier des noyaux de sole (1), comporte un dispositif de serrage (3) avec des éléments de serrage (2), le noyau (1) ayant au moins un évidement (4) - une ouverture, un passage ou un espace similaire - dans lequel s'engage le dispositif de serrage (3) avec ses éléments de serrage (2), est conçu pour la manutention automatique des noyaux de fonderie, en particulier pour le paquetage entièrement automatique, son mode de construction simple évite tout endommagement des noyaux lors de la manutention, les éléments de serrage (2) se présentant sous la forme de mâchoires de serrage (2) pouvant être pressées contre la paroi intérieure du noyau, de préférence par liaison de forme.
EP94915041A 1993-06-29 1994-05-18 Dispostif et procede de prehension pour noyaux de fonderie, en particulier des noyaux de sole Expired - Lifetime EP0706429B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4321563 1993-06-29
DE4321563 1993-06-29
DE4322181A DE4322181A1 (de) 1993-06-29 1993-07-03 Vorrichtung und Verfahren zum Greifen eines Gießereikerns, insbesondere eines Sohlenkerns
DE4322181 1993-07-03
PCT/DE1994/000574 WO1995001234A1 (fr) 1993-06-29 1994-05-18 Dispostif et procede de prehension pour noyaux de fonderie, en particulier des noyaux de sole

Publications (2)

Publication Number Publication Date
EP0706429A1 true EP0706429A1 (fr) 1996-04-17
EP0706429B1 EP0706429B1 (fr) 1997-03-26

Family

ID=25927219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94915041A Expired - Lifetime EP0706429B1 (fr) 1993-06-29 1994-05-18 Dispostif et procede de prehension pour noyaux de fonderie, en particulier des noyaux de sole

Country Status (7)

Country Link
US (1) US5730200A (fr)
EP (1) EP0706429B1 (fr)
JP (1) JP3142573B2 (fr)
CA (1) CA2166095C (fr)
DE (2) DE4322181A1 (fr)
ES (1) ES2100714T3 (fr)
WO (1) WO1995001234A1 (fr)

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US6145578A (en) * 1998-08-17 2000-11-14 Wayne C. Zearbaugh Spring unit for core pin assembly
DE10150796C2 (de) * 2001-10-15 2003-08-07 Collin Gmbh Dr Vorrichtung zur Prüfung der Reinheit von Kunststoffschmelzen
US7143807B2 (en) * 2004-06-04 2006-12-05 General Motors Corporation Mold design for improved bore liner dimensional accuracy
US7017648B2 (en) 2004-08-24 2006-03-28 General Motors Corporation Mold design for castings requiring multiple chills
US7409982B2 (en) * 2005-08-19 2008-08-12 Gm Global Technology Operations, Inc. Foundry mold assembly device and method
ES2538082T3 (es) 2007-02-11 2015-06-17 Map Pharmaceuticals Inc Método de administración terapéutica de DHE para permitir el rápido alivio de migraña mientras que se minimiza el perfil de efectos secundarios
ITTO20070406A1 (it) * 2007-06-08 2008-12-09 Global Foundry Systems S R L Metodo, attrezzo e impianto per la produzione di getti di fusione
US20090084516A1 (en) * 2007-09-27 2009-04-02 Fothergill John D Cast Slip with Preset Carbide Buttons
EP2777843B1 (fr) * 2013-03-15 2015-09-30 ZF Friedrichshafen AG Procédé et dispositif pour le procédé de fabrication d'une pièce coulée
JP6443422B2 (ja) * 2016-10-14 2018-12-26 トヨタ自動車株式会社 中子把持装置
JP6547776B2 (ja) * 2017-01-31 2019-07-24 トヨタ自動車株式会社 鋳造装置、及び鋳造方法
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Also Published As

Publication number Publication date
ES2100714T3 (es) 1997-06-16
EP0706429B1 (fr) 1997-03-26
CA2166095C (fr) 2000-04-11
US5730200A (en) 1998-03-24
WO1995001234A1 (fr) 1995-01-12
JP3142573B2 (ja) 2001-03-07
DE59402244D1 (de) 1997-04-30
DE4322181A1 (de) 1995-01-12
JPH08508936A (ja) 1996-09-24

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