EP1321209A2 - Vorrichtung zum Entkernen von Gussstücken - Google Patents

Vorrichtung zum Entkernen von Gussstücken Download PDF

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Publication number
EP1321209A2
EP1321209A2 EP02028039A EP02028039A EP1321209A2 EP 1321209 A2 EP1321209 A2 EP 1321209A2 EP 02028039 A EP02028039 A EP 02028039A EP 02028039 A EP02028039 A EP 02028039A EP 1321209 A2 EP1321209 A2 EP 1321209A2
Authority
EP
European Patent Office
Prior art keywords
fact
foundry
chassis
castings
actuators
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
EP02028039A
Other languages
English (en)
French (fr)
Other versions
EP1321209B1 (de
EP1321209A3 (de
Inventor
Giuseppe Zavattaro
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.)
GLOBAL FOUNDRY SYSTEMS Srl
Original Assignee
GLOBAL FOUNDRY SYSTEMS Srl
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 GLOBAL FOUNDRY SYSTEMS Srl filed Critical GLOBAL FOUNDRY SYSTEMS Srl
Publication of EP1321209A2 publication Critical patent/EP1321209A2/de
Publication of EP1321209A3 publication Critical patent/EP1321209A3/de
Application granted granted Critical
Publication of EP1321209B1 publication Critical patent/EP1321209B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/005—Removing cores by vibrating or hammering

Definitions

  • the present invention refers to a device for removing cores from foundry castings.
  • the hollow parts of a foundry casting are usually obtained having recourse to some cores made of sand.
  • Said cores have a shape complementary to the shape of the cavity to be obtained and the molten metal is cast around said cores.
  • the foundry casting Once the foundry casting has cooled, it is necessary to separate it from the cores, and the more complex the shape of the foundry casting is, the harder is the removal of the sand.
  • the cores are removed by blocking the foundry casting on a support and subjecting it to a hammering process and to a successive vibration process.
  • a system constituted by hammers By striking the foundry casting with a system constituted by hammers, the separation of the sand from the metal and a partial crushing of the core are obtained.
  • the separation of the core fragments from the casting is completed by subjecting the casting itself to a vibratory movement so that the sand can be removed by force of gravity.
  • the European patent EP 0,652,063 describes a device constituted by:
  • the foundry casting is fixed to the rigid chassis thanks to the blocking system.
  • Said blocking system is generally formed by a fixed element and by a mobile element gripping the foundry casting against the fixed element.
  • the casting is subjected to the action of one or more pneumatic hammers striking the surface of said casting in order to lead to the separation of the core from the casting and to a partial crushing of the core.
  • the hammering phase is followed by the vibration phase.
  • One or more vibrators are operated for transmitting a vibratory movement to the rigid chassis to which the casting is fixed.
  • the vibration of the chassis is permitted thanks to the fact that the joints connecting the chassis to the fixed support are elastically deformable.
  • the vibratory movement allows to remove the core from the casting and to let escape the sand by gravity.
  • the vibration of the foundry casting can be realised through the action of one or more vibrators integral with the support on which the casting is fixed and able to lead to a vibratory movement in said support.
  • it is not made use of a single vibrator but of two vibrators or of a multiple of two.
  • the vibratory movement of said devices can not turn into an effective vibration of the casting, as the different vibrators can interfere between them, so that their contributions dampen the vibratory movement of the foundry casting instead of increasing it.
  • a first object of the present invention is that of realising a device in which the vibration system is able to lead to an effective vibratory movement of the foundry casting in order to guarantee a high performance.
  • a further problem connected with the vibration phase is represented by the risk that the vibration of the foundry casting protracts too long after the end of the sand removal process, thereby preventing the operator to free immediately the casting from the support to which it is fixed and leading in this way to delays in the production line.
  • a second object of the present invention is that of realising a device able to overcome this drawback, so as to minimise the dead times of the process.
  • the invention differentiates itself from the device described in the patent EP 0,652,063 and from other known devices, as it proposes a different arrangement of the elements of the vibration system.
  • the symmetry axes of the vibrators lie on one of the symmetry planes of the device section that is intended to vibrate. In other known devices, the plane specified by the symmetry axes of the vibrators is parallel to one of said symmetry planes.
  • the device according to the invention has recourse to two vibrators so arranged that the plane specified by the symmetry axes of said vibrators passes through the geometric centre of the above mentioned chassis and is inclined with respect to the symmetry planes of said chassis of an angle not null and different from 90°.
  • the vibration is generally produced by vibrators of mechanical type incorporating a rod-crank system.
  • the device according to the invention has recourse to some electric motovibrators and this expedient allows to considerably reduce the dimensions of the device.
  • the device according to the invention is characterised by the presence of an additional blocking system integral with the support fixed to the ground.
  • the additional blocking system can intervene for blocking the vibratory movement and for allowing the operator to free immediately the foundry casting and for proceeding with the treatment of the successive casting.
  • the chassis 5 is connected with the fixed base 3 by means of four elastically deformable joints 7.
  • the joints 7 are made of an elastically deformable plastic material.
  • the device further incorporates a system 20 for blocking the foundry castings 11, a system 30 for hammering the castings 11, a system 40 for vibrating the castings 11 and, finally, a system 50 for rapidly blocking the castings 11 at the end of the core removal process.
  • the blocking system 20, mounted at an end of the chassis 5, can grip two foundry castings 11 at the same time by acting vertically down from above.
  • the blocking system 20 comprises a fixed part or base 21, and a mobile part or plates 24, said parts being mounted at the ends of a rotary arm 25 and being operated by two pneumatic actuators 23 arranged between the arm 25 and the plates 24.
  • the arm 25 can rotate around the shaft 27 of 90° in order to spread apart the plates 24 and to allow the loading of the foundry castings 11 on the base 21.
  • the arm 25 is made to rotate so that the plates 24 are aligned with the base 21.
  • the pneumatic actuators 23 are then expanded for bringing the plates 24 in engagement with the castings 11, so as to press them firmly against the base 21, one of the actuators being on the right and the other one on the left of the rotary shaft 27.
  • the pneumatic actuators 23 can be inflated and deflated by introducing air or sucking it back.
  • Said actuators 23 can be connected, according to the needs, at the inlet or at the outlet of a compressed air pump, not shown in the Figure.
  • the actuators 23 are connected to the pump outlet and then are inflated: in this way, the actuators can push the plates 24 on the castings 11 for keeping them pressed against the base 21.
  • the actuators 23 are deflated by acting on a by-pass valve connecting them to the pump inlet. In this way, the air present in the actuator chamber is rapidly sucked back, thereby allowing to free the castings 11.
  • a counterweight 9, compensating the weight of the foundry castings 11 and maintaining the chassis 5 in balance, is present at the opposite end of the chassis 5 with respect to the blocking system 20.
  • counterweight 9 is peculiar to the described embodiment.
  • the hammering system 30 is constituted by four pneumatic hammers 31, two on the right side and two on the left side with respect to the blocking system 20.
  • the hammers 31 are oriented towards the foundry castings 11 and are mounted on supports 33 in order to be aligned on a plane perpendicular to the plane of the chassis 5. Being the supports 33 fixed to the base 3, which is in turn fixed to the ground, and being said supports 33 independent from the chassis 5, the hammers 31 will not be subjected to vibrations during the vibration phase.
  • the vibration device 40 is constituted by two vibrators 41, arranged at two opposed sides of the chassis 5, that, when operated, lead to a vibratory movement in said chassis 5.
  • the plane specified by the two vertical symmetry axes of the two motovibrators 41 is indicated with V, it is clear that the plane V passes through the centre of the chassis 5 and forms with the symmetry planes L and T an angle ⁇ and an angle ⁇ respectively, both not null and different from 90°, preferably approximately 45°.
  • This angular position peculiar to the device according to the invention, ensures an effective transmission of the vibratory movement from the two motovibrators 41 to the chassis 5. In this way, high performance in removing the sand from the foundry castings 11 is guaranteed.
  • Said system is constituted by two pneumatic actuators 51, the operation of which is similar to that of the pneumatic actuators 23 and on which some plates 53 are mounted.
  • the actuators 51 are mounted on the fixed support 3 and are not integral with the chassis 5. As a consequence, they are not subjected to vibrations during the vibration phase of the foundry castings 11.
  • the blocking system 50 In case the vibration of the chassis 5 protracts beyond the end of the core removal process or, in any case, for blocking the vibrations in a more rapid way, it is possible to let the blocking system 50 intervene: the actuators 51 push the plates 53 against the foundry castings 11 and stop the vibratory movement of said castings.
  • the blocking system 20' is arranged for blocking the foundry castings 11 sideways instead of blocking them in their upper part.
  • the plates 24a, 24b, operated by the pneumatic actuators 23a, 23b, constitute the mobile part of the blocking system 20'.
  • the pneumatic actuators 23a, 23b operate according to the same mechanism of the pneumatic actuators 23 of the above described embodiment.
  • the wall 13 of the chassis 5 presents some slots 15: in said slots 15 are fixed some matching elements against which the actuators 23a,23b push the foundry castings 11 to be treated. Said matching elements may be chosen and positioned every time according to the needs, in order to adapt them to the shape of the castings 11 from which the core must be removed.
  • the lateral blocking may turn out to be more versatile and more adapted to castings of very different shape between them with respect to the vertical blocking.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Road Paving Machines (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP02028039A 2001-12-18 2002-12-16 Vorrichtung zum Entkernen von Gussstücken Expired - Lifetime EP1321209B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001TO001180A ITTO20011180A1 (it) 2001-12-18 2001-12-18 Dispositivo per rimuovere le anime dai getti di fusione.
ITTO20011180 2001-12-18

Publications (3)

Publication Number Publication Date
EP1321209A2 true EP1321209A2 (de) 2003-06-25
EP1321209A3 EP1321209A3 (de) 2004-07-07
EP1321209B1 EP1321209B1 (de) 2007-06-13

Family

ID=11459339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02028039A Expired - Lifetime EP1321209B1 (de) 2001-12-18 2002-12-16 Vorrichtung zum Entkernen von Gussstücken

Country Status (5)

Country Link
EP (1) EP1321209B1 (de)
AT (1) ATE364466T1 (de)
DE (1) DE60220631T2 (de)
ES (1) ES2289046T3 (de)
IT (1) ITTO20011180A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239262A1 (de) * 1982-10-23 1984-04-26 Alb. Klein Gmbh & Co Kg, 5241 Niederfischbach Verfahren und vorrichtung zum entkernen von gussstuecken
EP0493999A1 (de) * 1990-12-19 1992-07-08 Automobiles Peugeot Vorrichtung zum Entsanden von Gusstücken
EP0652063A1 (de) * 1993-11-05 1995-05-10 Dimafond - Distribution Et Ingenierie De Materiel Pour La Fonderie Vorrichtung zum Entkernen von Gussstücken

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239262A1 (de) * 1982-10-23 1984-04-26 Alb. Klein Gmbh & Co Kg, 5241 Niederfischbach Verfahren und vorrichtung zum entkernen von gussstuecken
EP0493999A1 (de) * 1990-12-19 1992-07-08 Automobiles Peugeot Vorrichtung zum Entsanden von Gusstücken
EP0652063A1 (de) * 1993-11-05 1995-05-10 Dimafond - Distribution Et Ingenierie De Materiel Pour La Fonderie Vorrichtung zum Entkernen von Gussstücken

Also Published As

Publication number Publication date
ITTO20011180A1 (it) 2003-06-18
DE60220631T2 (de) 2008-02-14
ITTO20011180A0 (it) 2001-12-18
ES2289046T3 (es) 2008-02-01
EP1321209B1 (de) 2007-06-13
ATE364466T1 (de) 2007-07-15
DE60220631D1 (de) 2007-07-26
EP1321209A3 (de) 2004-07-07

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