EP1000689A1 - Dispositif de débourrage de pièces coulées - Google Patents

Dispositif de débourrage de pièces coulées Download PDF

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Publication number
EP1000689A1
EP1000689A1 EP98830686A EP98830686A EP1000689A1 EP 1000689 A1 EP1000689 A1 EP 1000689A1 EP 98830686 A EP98830686 A EP 98830686A EP 98830686 A EP98830686 A EP 98830686A EP 1000689 A1 EP1000689 A1 EP 1000689A1
Authority
EP
European Patent Office
Prior art keywords
castings
machine according
support structure
vibrator
vibrator means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98830686A
Other languages
German (de)
English (en)
Inventor
Bartolomeo Residenza I Pioppi Tosco
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.)
Fata Group SpA
Original Assignee
Fata Group SpA
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 Fata Group SpA filed Critical Fata Group SpA
Priority to EP98830686A priority Critical patent/EP1000689A1/fr
Publication of EP1000689A1 publication Critical patent/EP1000689A1/fr
Withdrawn legal-status Critical Current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 relates to machines for shaking out (decoring) foundry castings, in particular according to the preamble to Claim 1.
  • Machines of this type are known in the art, as can be inferred, for example, from EP-A-0 111 461.
  • vibration-generating means typically sets of eccentric elements
  • motors of considerable power
  • the object of the present invention is to provide a machine for shaking out foundry castings in which the aforesaid problems are radically eliminated.
  • a machine usable for shaking out foundry castings such as, for example, internal-combustion engine blocks or heads, is generally indicated 1.
  • each casting is mounted on a support structure 2 (having the characteristics described further below) and is clamped as in a jaw between a central abutment element 3 (which is usually common to the two castings G) and an outer clamping portion 4.
  • Two percussion units are constituted substantially by a plurality of percussion elements 6 (of known type), comparable to pneumatic hammers. These elements have heads 7 which, when the elements 6 are operated (by known means not shown) can perform a violent hammering action on the castings G so as to bring about an initial breaking-up of the sand cores which are contained in the castings G and are to be removed by the shaking-out action.
  • percussion elements 6 of known type
  • heads 7 which, when the elements 6 are operated (by known means not shown) can perform a violent hammering action on the castings G so as to bring about an initial breaking-up of the sand cores which are contained in the castings G and are to be removed by the shaking-out action.
  • the solution according to the invention is intended greatly preferably for use in combination with the aforementioned percussion means, it is not per se restricted to the use of such means.
  • first portion 2a constituting a type of cradle on which the castings G are mounted
  • second portion 2b constituted substantially by a type of vibrating table with associated vibration means.
  • These means are preferably constituted, in accordance with a known solution, by sets of eccentric elements 8 rotated by a motor 9 such as an electric motor the shaft of which acts on one of the shafts of one of the eccentric elements 8 by means of a transmission unit.
  • the drive can be transmitted to the second set of eccentrics 8 by a further transmission, for example, of the type with a toothed belt 10 with an associated tensioning unit 11 and/or with various sets of gears.
  • Each set of eccentrics usually comprises eccentric elements arranged in pairs of contra-rotating elements disposed in a manner such that, during rotation, they remain in a symmetrically opposed condition relative to a theoretical plane passing through the two elements.
  • the set of eccentrics thus constantly remains in conditions of equilibrium in a direction perpendicular to the said plane, whilst the conditions of disequilibrium upon which the generation of the vibrations is based arise almost exclusively along this plane.
  • the plane of symmetry is oriented horizontally so that the vibration stress appears mainly along a horizontal axis.
  • the second portion 2b of the structure 2 is supported on the ground by resilient feet or bases 22 formed in a known manner such that the activation of the eccentrics 8 corresponds to a vibration of the portion 2b along a substantially horizontal axis.
  • Resilient suspension elements 12 constituted, for example, by springs, buffers of rubber or similar resilient materials, etc; are interposed between the two portions 2a and 2b of the structure for supporting the castings.
  • the elements 12 support the portion 2a resiliently relative to the portion 2b giving rise to a vibrating system also preferably having a principal vibration axis which is horizontal and hence identified by the double arrow shown in the drawings.
  • the aforementioned vibrating system has a resonance frequency of the order, for example, of about 30 Hz, this frequency naturally being determined (and selectively determinable) principally, by factors such as the mass/weight of the portion 2a (possibly also taking account of the mass of the castings G) and the resilience characteristics of the suspension elements 12.
  • the operating sequence of the machine according to the invention does not differ appreciably from the operating sequence of the known machines according to the solutions recited in the introductory portion of the present description.
  • the control device K (for example, a so-called PLC, or programmable logic controller) which supervises the operation of the machine in known manner, activates the percussion elements 6, which are intended to perform a violent hammering action on the castings G, resulting in initial breaking-up of the sand cores to be removed.
  • the hammering action is continued for a certain period of time (for example 10-15 seconds) and the motor 9 is then activated so as to vibrate the support structure 2.
  • the rate of rotation of the motor 9 is controlled (again by the control unit which supervises the operation of the machine), so as to bring about a gradual increase in the vibration frequency.
  • the two portions 2a and 2b of the support structure 2 vibrate together with a low amplitude, for example of about 2-3 mm.
  • the motor 9 When the vibration process is considered complete (for example, after about 40 seconds) the motor 9 is slowed down, thus reducing the frequency of operation of the vibrator means from the normal operating (resonance) frequency, thus bringing the vibrating system of the portion 2a below the resonance frequency until the movement of the support structure 2 as a whole is stopped.
  • the solution shown in the drawing provides for the use of two sets of eccentrics 8 situated on the portion 2b of the structure. Tests carried out by the Applicant show, however, that completely satisfactory operation can be achieved even with the use of only one of these sets.
  • the support members (for example bearings) and transmission members associated with the eccentrics 8 are therefore isolated from the action of the percussion elements 6, preventing damage thereto.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP98830686A 1998-11-16 1998-11-16 Dispositif de débourrage de pièces coulées Withdrawn EP1000689A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98830686A EP1000689A1 (fr) 1998-11-16 1998-11-16 Dispositif de débourrage de pièces coulées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98830686A EP1000689A1 (fr) 1998-11-16 1998-11-16 Dispositif de débourrage de pièces coulées

Publications (1)

Publication Number Publication Date
EP1000689A1 true EP1000689A1 (fr) 2000-05-17

Family

ID=8236885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830686A Withdrawn EP1000689A1 (fr) 1998-11-16 1998-11-16 Dispositif de débourrage de pièces coulées

Country Status (1)

Country Link
EP (1) EP1000689A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007132101A1 (fr) * 2006-05-17 2007-11-22 Massin Technologies Procede de martelage, dispositif marteleur actionnable par un systeme vibrateur et utilisation du dispositif dans une machine de debourrage
WO2016164955A1 (fr) * 2015-04-17 2016-10-20 Fill Gesellschaft M.B.H. Machine de dénoyautage/machine vibrante équipée d'un entraînement amélioré

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718473A (en) * 1985-01-25 1988-01-12 General Kinematics Corporation Vibratory stress relief apparatus
US4722386A (en) * 1987-04-23 1988-02-02 General Kinematics Corporation Casting core shakeout
FR2699840A1 (fr) * 1992-12-28 1994-07-01 Peugeot Machine à dessabler les pièces de fonderie.
FR2730436A1 (fr) * 1995-02-13 1996-08-14 Peugeot Procede et dispositif pour le dessablage d'une piece de fonderie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718473A (en) * 1985-01-25 1988-01-12 General Kinematics Corporation Vibratory stress relief apparatus
US4722386A (en) * 1987-04-23 1988-02-02 General Kinematics Corporation Casting core shakeout
FR2699840A1 (fr) * 1992-12-28 1994-07-01 Peugeot Machine à dessabler les pièces de fonderie.
FR2730436A1 (fr) * 1995-02-13 1996-08-14 Peugeot Procede et dispositif pour le dessablage d'une piece de fonderie

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007132101A1 (fr) * 2006-05-17 2007-11-22 Massin Technologies Procede de martelage, dispositif marteleur actionnable par un systeme vibrateur et utilisation du dispositif dans une machine de debourrage
FR2901162A1 (fr) * 2006-05-17 2007-11-23 Marcel Massin Procede de martelage, dispositif marteleur actionnable par un systeme vibrateur et utilisation du dispositif dans une machine de debourrage
WO2016164955A1 (fr) * 2015-04-17 2016-10-20 Fill Gesellschaft M.B.H. Machine de dénoyautage/machine vibrante équipée d'un entraînement amélioré
CN107660166A (zh) * 2015-04-17 2018-02-02 费尔有限公司 具有改进的驱动装置的除芯机/振动机
CN107660166B (zh) * 2015-04-17 2019-09-24 费尔有限公司 具有改进的驱动装置的除芯机/振动机

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