EP0168635B1 - Einrichtung zum Aushärten von aus Sand unter Beigabe von aushärtbaren Bindemitteln hergestellten Kernen und/oder Formen - Google Patents

Einrichtung zum Aushärten von aus Sand unter Beigabe von aushärtbaren Bindemitteln hergestellten Kernen und/oder Formen Download PDF

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Publication number
EP0168635B1
EP0168635B1 EP85107249A EP85107249A EP0168635B1 EP 0168635 B1 EP0168635 B1 EP 0168635B1 EP 85107249 A EP85107249 A EP 85107249A EP 85107249 A EP85107249 A EP 85107249A EP 0168635 B1 EP0168635 B1 EP 0168635B1
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EP
European Patent Office
Prior art keywords
regulating valve
valve
hardening
compressed air
substance
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
EP85107249A
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German (de)
English (en)
French (fr)
Other versions
EP0168635A2 (de
EP0168635A3 (en
Inventor
Horst Werner Dipl.-Ing. Michel
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Individual
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Individual
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Publication date
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Priority to AT85107249T priority Critical patent/ATE57320T1/de
Publication of EP0168635A2 publication Critical patent/EP0168635A2/de
Publication of EP0168635A3 publication Critical patent/EP0168635A3/de
Application granted granted Critical
Publication of EP0168635B1 publication Critical patent/EP0168635B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/123—Gas-hardening

Definitions

  • the invention relates to a device for curing cores and / or molds made from sand with the addition of curable binders, which are used for casting molded articles from flowable compositions, with a predetermined amount of the substance causing the curing of the binder being controlled by control valves
  • control valves With the aid of compressed air which can be regulated through its flow through a control valve, by mixing this substance with this compressed air into the core or the mold, and the control valve is controlled automatically according to a predetermined schedule.
  • DE-A-OS 28 33 305.3 describes an electropneumatic control with which it is possible to generate a predetermined schedule for feeding the compressed air into a device in which a line for a liquid catalyst leads to a mixing chamber and one Heating device and controlled valves are provided which control the entry of the compressed air and the entry of the catalyst to the mixing chamber in time with the work processes, the heating device being connected upstream of the mixing chamber and a further shut-off valve being provided between the mixing chamber and the core or mold.
  • the schedule for the workflow is divided into a cycle time and a break time.
  • the compressed air fed in has a certain pressure value, for example 2 bar, which is controlled by a valve arrangement and can increase in the course of the cycle time to, for example, 6 bar.
  • the gasified catalyst is located under the initial pressure of the compressed air in the mixing area, which is composed of the heating device and a mixing chamber. This catalyst is driven out by the supply of compressed air and finally reaches a proportion of zero in the mixing chamber.
  • the so-called hardening time lasts from the beginning to the point in time when the catalyst in the mixing chamber has finally reached the proportion of zero.
  • a rinsing process follows. The purge is done with pure compressed air.
  • the system is closed off from the compressed air source, so that the pressure of the compressed air can now relax completely and finally reaches a normal value corresponding to the external pressure. This completes the cycle time and a pause time of any length begins.
  • the suction pump for the liquid catalyst has started to work and continues until a point is reached which is dependent on the amount of the catalyst to be sucked in.
  • the known device works by electropneumatic means, which means that a number of mechanical components and in particular valves must be available.
  • the valves in particular wear out and can thus become defective.
  • the object of the invention is to provide a device which manages with considerably fewer components and in particular allows the required control to be simplified considerably.
  • a proportional pressure control valve is provided for the control of the control valve, which can be actuated by an external control which also controls the other control valves.
  • a particular advantage of the device according to the invention namely in both embodiments, is that several dosing cycles during the workflow, i.e. H. the time during which the compressed air is running can be obtained. This results in the possibility of an exact adjustment of the dosage to the size of the workpiece.
  • the metered quantity can now be multiplied as often as required, which is possible by simply installing an additional valve which can also be controlled by the control system.
  • flowable mass is to be understood as meaning masses from which a shaped body can be produced in a mold, it being irrelevant whether the production is made from a mass which has been heated to the melt or from a mass which has been added to a powdery substance by adding liquid Sludge or the like. Or a mass fluidized in some other way.
  • sand is to be understood as meaning all powdery to granular substances which are suitable for the production of molds and / or cores and which can be compacted by means of a hardenable binder.
  • Fig. 1 the connection to a compressed air source is designated at 1, which is, for example, under a pressure of 6 bar.
  • a water, oil and dirt separator can be seen, which ensures that the system is only supplied with clean compressed air.
  • the incoming compressed air arrives to the control valve 3, which is controlled by the proportional pressure control valve 4.
  • the control valve 3 the control of which is indicated schematically in FIG. 3a
  • the compressed air passes via a measuring device 5 and a safety check valve 6 to the heating block 7, which is penetrated by labyrinth channels guiding the compressed air and is preferably made of aluminum.
  • Heating resistors are cast into this heating block 7, the connections of which are indicated at 8.
  • 9 means a temperature measuring device, for example in the form of a resistance thermometer.
  • the line 10 leads directly in the direction of the arrow to the mold.
  • the substance curing the binder in the sand in the mold e.g. B. a catalyst is removed from a reservoir 11 via a check valve 12 with the aid of a metering pump 13. With 14 a pressure measuring device for indicating the pressure of this substance is designated.
  • the substance passes from the metering pump 13 via a valve arrangement 15 and a mixing chamber 16 and via line 17 into the heating block 7 and is conveyed from it via line 10 to the molding tool in the corresponding working cycle.
  • the arrangement of the throttle valve 18 and the actuating valve 19 is used for the corresponding clocking and the adjustment of the suction speed.
  • a directional control valve is provided, via which an air flow is led into the mixing chamber 16, which atomizes the substance coming from the metering pump 13 and carries it via line 17 into the heating block 7.
  • FIG. 2 the parts in FIG. 1 have the same parts with the same reference numerals, so that their detailed description is no longer required.
  • the proportional pressure control valve 4, which is shown in FIG. 1, is replaced in the embodiment according to FIG. 2 by a pressure control valve 41 which can be preset by hand and acts on the control valve 3 via an electrically or pneumatically controlled directional valve 42.
  • this directional control valve 42 can itself be contained in this directional control valve 42 if it can be controlled practically without friction from unpressurized to the final value.
  • the directional control valve 42 is controlled by an electro-pneumatic directional control valve 43 or directly by a pneumatic control, which is not shown but is known per se.
  • the actuating valve 19 of the metering pump 13 is also influenced by a manually adjustable pressure regulator 191 and thus enables the metered quantity to be reproduced.
  • the directional control valve 20 of the embodiment according to FIG. 1 can be saved because the compressed air line to the heating block 7 is led directly via the mixing chamber 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP85107249A 1984-06-19 1985-06-12 Einrichtung zum Aushärten von aus Sand unter Beigabe von aushärtbaren Bindemitteln hergestellten Kernen und/oder Formen Expired - Lifetime EP0168635B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85107249T ATE57320T1 (de) 1984-06-19 1985-06-12 Einrichtung zum aushaerten von aus sand unter beigabe von aushaertbaren bindemitteln hergestellten kernen und/oder formen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3422742 1984-06-19
DE19843422742 DE3422742A1 (de) 1984-06-19 1984-06-19 Steuerung fuer eine vorrichtung zum aushaerten von sandkernen und/oder -formen

Publications (3)

Publication Number Publication Date
EP0168635A2 EP0168635A2 (de) 1986-01-22
EP0168635A3 EP0168635A3 (en) 1988-01-20
EP0168635B1 true EP0168635B1 (de) 1990-10-10

Family

ID=6238725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107249A Expired - Lifetime EP0168635B1 (de) 1984-06-19 1985-06-12 Einrichtung zum Aushärten von aus Sand unter Beigabe von aushärtbaren Bindemitteln hergestellten Kernen und/oder Formen

Country Status (4)

Country Link
US (1) US4644994A (enrdf_load_stackoverflow)
EP (1) EP0168635B1 (enrdf_load_stackoverflow)
AT (1) ATE57320T1 (enrdf_load_stackoverflow)
DE (2) DE3422742A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135043A (en) * 1990-06-25 1992-08-04 Omco Usa, Inc. Apparatus and method for gas curing foundry cores and molds
US5971056A (en) * 1997-05-27 1999-10-26 Luger GmbH Device for hardening foundry cores and use thereof
GB2333985A (en) * 1998-02-10 1999-08-11 Dean Anthony Jones Casting core production
US6505671B1 (en) * 2000-12-28 2003-01-14 Hayes Lemmerz International, Inc. Method for producing a sand core
CH698743B1 (de) * 2006-04-24 2009-10-15 Lueber Gmbh Verfahren und Einrichtung zum Aushärten von anorganischen Giesserei-Kernen und -Formen.

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1269202A (en) * 1968-02-14 1972-04-06 Fordath Ltd Improvements in the production of cores for use in the production of metal castings
DE2162137C2 (de) * 1971-12-15 1983-01-13 Horst-Werner Ing.(Grad.) 7707 Engen Michel Anlage zum Aushärten von Sandformen und -kernen für Gießereizwecke
US4105725A (en) * 1972-11-21 1978-08-08 Liquid Carbonic Canada Ltd. Saturated liquid/vapor generating and dispensing
US3937272A (en) * 1973-10-29 1976-02-10 Sutter Products Company Cold set catalyst supply and fume incinerator for a foundry core making machine
DE2413537C2 (de) * 1974-03-21 1984-11-15 Horst-Werner Ing.(Grad.) 7707 Engen Michel Vorrichtung zum Herstellen von Kernen für Gießereizwecke
DE2621153A1 (de) * 1976-05-13 1977-11-24 Daimler Benz Ag Verfahren und einrichtung zum aushaerten von sandformkoerpern
DE2704868C2 (de) * 1977-02-05 1988-11-10 Horst Werner Dipl.-Ing. 7707 Engen Michel Verfahren und Vorrichtung zur Kernherstellung für Gießereizwecke
CH641067A5 (de) * 1978-07-28 1984-02-15 Horst Werner Michel Verfahren und vorrichtung zum aushaerten von aus sand hergestellten kernen und/oder formen, die zum giessen von formkoerpern aus metall verwendung finden.
DE2833305A1 (de) * 1978-07-28 1980-02-07 Michel Horst Werner Ing Grad Verfahren und vorrichtung zum aushaerten von aus sand hergestellten kernen und/oder formen, die zum giessen von formkoerpern aus metall verwendung finden
US4359082A (en) * 1979-07-28 1982-11-16 Michel Horst Werner Method and apparatus for hardening mold parts made of sand for making metal castings
US4483384A (en) * 1980-06-02 1984-11-20 Michel Horst Werner Apparatus for hardening mold parts made of sand for making metal castings
DE3135510C2 (de) * 1981-09-08 1987-05-07 Horst Werner Dipl.-Ing. 7707 Engen Michel Vorrichtung zum Aushärten von aus Sand unter Beigabe von aushärtbaren Bindemitteln hergestellten Kernen und/oder Formen

Also Published As

Publication number Publication date
EP0168635A2 (de) 1986-01-22
DE3422742C2 (enrdf_load_stackoverflow) 1987-07-16
EP0168635A3 (en) 1988-01-20
DE3422742A1 (de) 1985-12-19
DE3580065D1 (de) 1990-11-15
US4644994A (en) 1987-02-24
ATE57320T1 (de) 1990-10-15

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