EP0304683B1 - Verfahren und Vorrichtung zum Entkernen von Gussstücken - Google Patents

Verfahren und Vorrichtung zum Entkernen von Gussstücken Download PDF

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Publication number
EP0304683B1
EP0304683B1 EP88112548A EP88112548A EP0304683B1 EP 0304683 B1 EP0304683 B1 EP 0304683B1 EP 88112548 A EP88112548 A EP 88112548A EP 88112548 A EP88112548 A EP 88112548A EP 0304683 B1 EP0304683 B1 EP 0304683B1
Authority
EP
European Patent Office
Prior art keywords
casting
hammer
rapping
vibrational energy
core
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.)
Expired - Lifetime
Application number
EP88112548A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0304683A3 (en
EP0304683A2 (de
Inventor
Dieter Fünfhausen
Günter Dipl.-Kfm. Heppel
Harry Ruppert
Dieter Schmidt
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.)
"fuk" Frolich & Kluepfel Drucklufttechnik & Co KG GmbH
Original Assignee
"fuk" Frolich & Kluepfel Drucklufttechnik & Co KG 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 "fuk" Frolich & Kluepfel Drucklufttechnik & Co KG GmbH filed Critical "fuk" Frolich & Kluepfel Drucklufttechnik & Co KG GmbH
Priority to AT88112548T priority Critical patent/ATE77277T1/de
Publication of EP0304683A2 publication Critical patent/EP0304683A2/de
Publication of EP0304683A3 publication Critical patent/EP0304683A3/de
Application granted granted Critical
Publication of EP0304683B1 publication Critical patent/EP0304683B1/de
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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 invention relates to a mechanical method and a device for removing inner cores from castings after the casting metal has hardened.
  • Inner cores are bodies of core sand that have the inner contours of castings. They must have a relatively high strength so that they can withstand the forces that occur during casting and especially when cooling. On the other hand, they should also disintegrate easily so that the casting can be easily freed from the core when cleaning.
  • openings so-called core holes are provided, which e.g. created by core brands and should facilitate or facilitate the removal of the cores in the blow room.
  • Vibration energy is transferred from the outside via the casting to the core, which is destroyed thereby and breaks up into fragments or flows down from the core holes.
  • the impact energy must be below the destruction energy for the casting, but must be so high that the core is destroyed.
  • Thin-walled castings require a core of relatively high strength so that the casting can be safely carried by the core during casting and hardening. Such castings, however, have a relatively low strength, so that excessive energy for destroying the core is not transmitted to the casting can be, if you want to prevent cracks in the casting or unwanted permanent deformation. From DE-A-34 24 000 it is known to tap castings to remove inner cores. For the same purpose it is known from DE-A-33 19 312 to use vibration energy.
  • varying impulses are transmitted via the wall of the casting to the core or the fragments of the core during the coring.
  • the intricately constructed casting 1 is part of a motor vehicle engine and has two lateral cavities 2, an intermediate space 3 connecting the cavities 2 and openings 4 in the wall of the intermediate space. Relatively narrow channels 5 are provided between the intermediate space 3 and the cavities 2. The entire interior of the casting ... is filled with the molding sand core after casting. The molding sand core is to be destroyed and removed from the casting via opening 4.
  • castings 1 are automatically transported in row 6 with suitable transport means 6a and individually placed on a knocking table 7 and held there. Then, with the plunger 9 of a pneumatic jack 8 known per se, a certain impact or knock energy is applied to the rear wall 10 of the intermediate space 3.
  • the impulses of the knock energy are transmitted through the wall of the casting to the core, which adheres to the inner wall of the casting, and produce cracks in the core, so that the core is broken down into several sections.
  • the core material is detached from the inner wall of the casting, whereby abrasion (loose molding sand) is formed. The abrasion dampens the impact energy so that it becomes relatively ineffective.
  • the shape of the impact impulses is shown by way of example and schematically from FIG. 2. These are medium-frequency vibrations of low amplitude (vibration range) but high acceleration (impact energy). For example, knocking takes place at approximately 13 Hz and a single impact work of approximately 44 Nm.
  • the impact work, the frequency and the amplitudes are preferably varied during the tapping on a casting. The required impact work and amplitude are determined empirically for different castings and different core material.
  • the vibrating table 11 After tapping the casting 1 is conveyed to a vibrating table 11 and clamped there firmly.
  • the vibrating table 11 has means 12 for generating vibration energy and means 13 for transmitting the vibration energy to the casting 1.
  • the vibrating table 11 is rotatably mounted about a horizontal axis 14 in the direction of the arrow 15 and about an axis 16 perpendicular thereto in the direction of the arrow 17, so that the vibrating table 11 and thus the casting 1 during vibration about these axes 14, 16 with corresponding drive means (not shown) ) can be rotated.
  • the casting 1 is shaken, that is to say set in oscillations of high acceleration and low frequency, with amplitudes being selected whose height is greater than the distance between the inner wall of the casting and the remaining pieces of the core.
  • the inner wall thus hits the core pieces before the upper and lower turning point of the amplitude and further crushes them.
  • the amplitude height is adapted to the increasing distance between core remnants and the inner wall of the casting.
  • the casting is preferably rotated about the axes 14, 16 during the shaking and the shaking is expediently interrupted in the meantime and pouring energy is introduced, as described above, so that the abrasion caused by the shaking can flow off.
  • the buffer effect caused by the abrasion between the inner wall of the casting and the core remnants is eliminated and the vibrating energy is optimized.
  • the shaking and, if appropriate, trickle vibration is continued until the core fragments are so small that they fit through the channels 5 and openings 4 of the casting.
  • the simultaneous rotation of the casting while shaking and vibrating means that core pieces do not get stuck in vibration nodes and remain there unreduced.
  • Fig. 3 shows an example of a vibration energy, which is preferably carried out up and down. Zones 1 and 2 illustrate this alternation. It can be carried out in terms of duration as well as in terms of frequency and amplitude.
  • the shaking is preferably carried out at changing frequencies between 0 to 50 Hz. Centrifugal forces of approximately 30,000 N are expediently generated.
  • the optimal vibrating energy is determined empirically like the optimal tapping energy for certain castings and certain molding sand properties.
  • An essential part of the method according to the invention is the variation of the vibrations according to the different tasks that they are supposed to fulfill.
  • a known electro-pneumatic hammer with an electro-pneumatic hammer mechanism can also be used.
  • a hydraulic hammer known per se which is operated with oil pressure, is also suitable.
  • the hydraulic hammer has the advantage of a smaller, compact design and less noise.
  • a hydraulic pump works more quietly than a compressor.
  • the vibration table 11 is preferably operated with a known high-frequency electro-vibrator 12. Frequency and voltage converters are provided to drive the high-frequency electric vibrator, which provide the vibration energy required for the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP88112548A 1987-08-27 1988-08-02 Verfahren und Vorrichtung zum Entkernen von Gussstücken Expired - Lifetime EP0304683B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88112548T ATE77277T1 (de) 1987-08-27 1988-08-02 Verfahren und vorrichtung zum entkernen von gussstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873728687 DE3728687A1 (de) 1987-08-27 1987-08-27 Verfahren und vorrichtung zum entkernen von gussstuecken
DE3728687 1987-08-27

Publications (3)

Publication Number Publication Date
EP0304683A2 EP0304683A2 (de) 1989-03-01
EP0304683A3 EP0304683A3 (en) 1990-05-16
EP0304683B1 true EP0304683B1 (de) 1992-06-17

Family

ID=6334654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112548A Expired - Lifetime EP0304683B1 (de) 1987-08-27 1988-08-02 Verfahren und Vorrichtung zum Entkernen von Gussstücken

Country Status (5)

Country Link
EP (1) EP0304683B1 (ja)
AT (1) ATE77277T1 (ja)
DE (2) DE3728687A1 (ja)
ES (1) ES2032504T3 (ja)
GR (1) GR3005538T3 (ja)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655895B1 (fr) * 1989-12-19 1994-06-03 Peugeot Machine pour le debourrage de pieces de fonderie.
FR2680327B1 (fr) * 1991-08-14 1993-11-05 Massin Perfectionnements aux procedes et aux dispositifs de debourrage de noyaux de coulee de pieces de fonderie.
DE69230160T2 (de) * 1991-02-07 2000-08-17 Massin Sa Verfahren und Vorrichtungen zum Entkernen von Gussstücken
DE29616860U1 (de) * 1996-09-27 1996-12-05 Vaw Mandl & Berger Gmbh, Linz Vorrichtung zur Überwachung der Entkernung von Gußstücken
US6644382B1 (en) 1997-12-13 2003-11-11 Yoshitaka Aoyama Casting sand shake-out method and its apparatus
JP3236998B2 (ja) * 1999-04-17 2001-12-10 好高 青山 鋳物の砂落し装置
GB2385549A (en) * 1999-04-17 2003-08-27 Yoshitaka Aoyama Casting sand shake-out apparatus
FR2850890B1 (fr) * 2003-02-10 2006-09-15 Remi Dupuis Dispositif de dessablage de pieces de fonderie creuses
WO2006074676A1 (de) * 2004-12-23 2006-07-20 'f.U.K' Frölich & Klüpfel Drucklufttechnik Gmbh & Co. Kg Entkernungsvorrichtung und entkernungsverfahren
SI24307A (sl) 2013-03-29 2014-09-30 Rc Simit D.O.O. Vrtanje peščenih jeder iz ulitkov
WO2017208065A1 (de) * 2016-05-30 2017-12-07 Nemak, S.A.B. De C.V. Verfahren zum entkernen von gussteilen
AT15916U1 (de) * 2017-02-24 2018-09-15 Fill Gmbh Vorrichtung zum Entkernen eines Werkstückes
WO2018152559A1 (de) * 2017-02-24 2018-08-30 Fill Gesellschaft M.B.H. Vorrichtung und verfahren zur zerstörung eines gusskerns
AT520370B1 (de) 2017-09-07 2020-08-15 Fill Gmbh Verfahren zur Herstellung eines gegossenen Werkstückes
AT520666B1 (de) 2017-11-22 2020-07-15 Fill Gmbh Entkernmaschine zum Entkernen von Gusswerkstücken sowie Verfahren zum Herstellen von Gusswerkstücken
DE102017222702A1 (de) * 2017-12-14 2019-06-19 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Entkernen von Gussteilen
AT521193B1 (de) * 2018-04-25 2021-08-15 Fill Gmbh Verfahren zum Entkernen eines Gußteils
CN113135400B (zh) * 2021-04-28 2022-08-30 南昌科勒有限公司 一种工件自动传送设备及工件自动传送方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE392997C (de) * 1922-06-28 1924-04-02 Rigobert Heusinger Vorrichtung zum Loesen von Kernen aus Metallabguessen
CH638414A5 (en) * 1979-04-04 1983-09-30 Fischer Ag Georg Method and apparatus for emptying workpieces containing cavities, in particular castings
CH654230A5 (de) * 1981-05-27 1986-02-14 Werner Lueber Vorrichtung zum entfernen des kernsandes aus guss-stuecken.
DE3319312C2 (de) * 1982-06-10 1984-08-02 Gebr. Grundmann GmbH, Herzogenburg, Niederösterreich Verfahren und Einrichtung zum Entleeren von Hohlräumen bei Werkstücken
DE3424000A1 (de) * 1984-06-29 1986-01-02 Carl Schenck Ag, 6100 Darmstadt Verfahren und vorrichtung zum entfernen von sand an gussteilen
CH669343A5 (ja) * 1985-12-19 1989-03-15 Werner Lueber

Also Published As

Publication number Publication date
EP0304683A3 (en) 1990-05-16
ATE77277T1 (de) 1992-07-15
DE3728687A1 (de) 1989-03-09
DE3728687C2 (ja) 1990-02-08
EP0304683A2 (de) 1989-03-01
ES2032504T3 (es) 1993-02-16
GR3005538T3 (ja) 1993-06-07
DE3872107D1 (de) 1992-07-23

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