EP0078897B1 - Unterdruckkupplung für vakuumverfestigte Giessformen - Google Patents

Unterdruckkupplung für vakuumverfestigte Giessformen Download PDF

Info

Publication number
EP0078897B1
EP0078897B1 EP82108197A EP82108197A EP0078897B1 EP 0078897 B1 EP0078897 B1 EP 0078897B1 EP 82108197 A EP82108197 A EP 82108197A EP 82108197 A EP82108197 A EP 82108197A EP 0078897 B1 EP0078897 B1 EP 0078897B1
Authority
EP
European Patent Office
Prior art keywords
valve body
piston
rod
valve
pressure medium
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
Application number
EP82108197A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0078897A1 (de
Inventor
Herbert Grolla
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.)
Heinrich Wagner Sinto Maschinenfabrik GmbH
Original Assignee
Heinrich Wagner Sinto Maschinenfabrik 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 Heinrich Wagner Sinto Maschinenfabrik GmbH filed Critical Heinrich Wagner Sinto Maschinenfabrik GmbH
Priority to AT82108197T priority Critical patent/ATE19211T1/de
Publication of EP0078897A1 publication Critical patent/EP0078897A1/de
Application granted granted Critical
Publication of EP0078897B1 publication Critical patent/EP0078897B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding

Definitions

  • the invention relates to a vacuum coupling for the connection of mold boxes for vacuum-hardened casting molds to a vacuum network, with a valve body movably guided on a rod and acted upon by a prestressing force in the direction of the mold box, which valve body has a connection opening surrounded by a seal and between the latter and a negative pressure connection contains a valve, which is formed by a valve seat in the valve body and a valve plate carried by the rod, is kept closed by the pretensioning force and, in relation to the pretensioning force, results in a relative movement of the valve body with respect to the pretensioning force, caused by the pressing of the coupling the rod opens.
  • the dimensional stability is determined by the inside of the casting mold, i.e. H. obtained in the molding compound, generated negative pressure. This negative pressure must be used to manufacture the.
  • the casting mold, during transport, during pouring and also when the casting cools down, must always be maintained, since otherwise the molding compound loses its solidified state. Since the individual processing stations can be very far apart, the mold must be connected to the vacuum connections located at the individual workplaces, which can be achieved either by simply attaching hoses by hand or by mechanically operated couplings in connection with valve controls.
  • a vacuum coupling for vacuum molding boxes known from DE-A-2710481 is also arranged in a stationary manner, and the molding box must be moved so close to the vacuum coupling until the gap remaining between them has become so small that the vacuum applied is sufficient to counter the force against the valve a return spring is sucked onto the wall of the molding box over a short distance. This way of working is associated with considerable functional uncertainty and with a considerable loss of vacuum.
  • the invention has for its object a vacuum clutch of the type mentioned, d. H. to create with valve automatically opening when coupling, which has a simple and space-saving design and enables the connection between the mold and vacuum network, without the mold having to perform a mounting or coupling movement to the coupling.
  • a vacuum clutch of the type mentioned according to the invention is characterized in that a piston working in a pressure medium cylinder is connected to the rod and that by applying pressure medium to at least one side of the piston, the rod takes the valve body against the molding box or away from it is movable.
  • valve body By simply applying pressure to the piston with pressure medium, the valve body can first be moved and pressed against the molding box over a considerable distance by means of the rod, and then automatically in the course of this pressing movement when the pressure-tight connection of the valve housing to the casting mold is already made, the opening of the valve and thus the release of the negative pressure to the casting mold takes place.
  • the pressure medium cylinder is preferably a double-acting pressure medium cylinder Pressure medium supply optionally designed for one or the other piston surface of the piston, in order to be able to carry out both the approaching and the moving away of the coupling relative to the casting box by applying pressure medium. Alternatively, however, it is also possible to simply bring the coupling closer to the casting box by applying pressure medium and pulling the coupling off using a return spring.
  • the valve body is provided with an annular piston part immersed in the pressure medium cylinder, and that the biasing force holding the valve closed is provided by a piston space in the cylinder space between the annular piston part of the valve body and the piston surface of the rod facing the latter supplied pressure medium is generated.
  • the vacuum clutch is actuated by the double-acting pressure cylinder, the cylinder chamber of the pressure cylinder adjacent to the valve body being constantly subjected to a certain pressure, while the other side of the pressure cylinder is only pressurized when the vacuum clutch is actuated, which pressure corresponds to the pressure in the first cylinder chamber corresponds.
  • the piston of the pressure cylinder is designed as a differential piston, so that the same pressure on both sides of the piston moves in the direction of the valve body. However, since the valve body is also immersed in one cylinder chamber and acted upon by the pressure medium in the axial direction, there is no relative displacement between the piston and the valve body until its contact surface rests on the casting mold.
  • This embodiment has the advantage that the rod can be extended by actuating the pressure cylinder even when the molding box is not yet in its place.
  • the piston assumes the uppermost or extended position without any relative movement between the valve body and the rod.
  • the valve remains closed until the mold is put in its place. Only when the valve body is loaded by the casting mold is the valve body moved towards the pressure cylinder so that the valve can open.
  • the vacuum clutch 1 shown in FIGS. 1 and 2 in section consists of a valve body 2, which is immersed in a pressure cylinder 19 and is guided tightly in its cylinder head 15.
  • the valve body 2 has a vacuum connection 3, to which the line coming from the vacuum network and not shown can be connected.
  • the valve body 2 is provided with a bore 6 in which a rod 5 slides, which is sealed by means of a seal 7 in the bore.
  • the end 13 of the valve body is designed as an annular piston and guided in the cylinder head 15 of the pressure cylinder 19 and sealed by means of a seal 16.
  • valve 10 In the upper region of the valve body 2, a valve 10 is formed which has an annular valve seat 9 which extends in a plane perpendicular to the rod 5. At the end of the rod 5, a valve plate 8 is arranged with an annular seal 11, which cooperates with the valve seat 9.
  • the valve body 2 forms at its free end an annular sealing surface 34 which is provided with an annular seal 35.
  • This ring seal is at a distance from the valve 10, namely such a distance that the displacement of the valve plate 8 takes place within the valve body 2.
  • the pressure cylinder 19 is designed as a double-acting cylinder and has two pressure medium connections 21 and 27.
  • the cylinder head 15 and the cylinder base 20 are connected to one another via a tube 36 and sealed with respect to them by means of seals 37.
  • the piston 17 arranged in the pressure cylinder 19, which is fixedly connected to the rod 5, is known to be sealed with respect to the tube 36 by means of sealing rings 18.
  • the length of the part 13 of the valve body 2, which is designed as an annular piston, is dimensioned such that, when the piston 17 is displaced to the maximum extent, it is sufficiently guided and sealed in the cylinder head 15.
  • the operation of the vacuum clutch according to the invention is as follows.
  • the cylinder chamber 14 is continuously connected via the connection 21 to a pressure medium source, so that a constant pressure is maintained in this.
  • This pressure is exerted on the one hand on the annular surface 22 of the piston 17 and on the other hand on the annular surface 23 of the annular piston 13, which is part of the valve body 2.
  • Pistons 17 and Annular pistons 13 are thus moved in opposite directions by the prevailing pressure, so that the rod 5 is thereby moved in the direction 24 and the valve 10 closes.
  • the magnitude of the closing force of the valve 10 is thus dependent on the size of the annular surface 23. Since the cylinder space 26 is depressurized, the piston 17 will shift in the direction 24, as shown in FIG. 1, until the valve body 2, which is carried by the valve plate 8, rests with its shoulder on the cylinder head 15.
  • the cylinder chamber 26 is pressurized via the connection 27 with the same pressure that also prevails in the cylinder chamber 14. Since the piston area 28 in the cylinder space 26 is larger by the area of the rod 5 than the ring area 22 in the cylinder space -14, the piston 17 moves in the direction 25. The distance of the piston 17 from the ring area 23 of the valve body 2 does not change, however the annular piston 13 is also displaced in the direction 25 by the pressure prevailing in the cylinder space 14. The relative distance from the annular piston 13 changes only when the sealing surface 34 comes to rest on the casting mold 30. This has the consequence that the valve plate 8 stands out from the valve seat 9 and the connection between the vacuum network and the valve outlet is thus obtained.
  • a vacuum clutch according to the invention can be installed in any position and also does not require that the mold must be moved against the vacuum clutch so that the vacuum valve 10 is opened.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Fluid-Driven Valves (AREA)
EP82108197A 1981-11-06 1982-09-06 Unterdruckkupplung für vakuumverfestigte Giessformen Expired EP0078897B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82108197T ATE19211T1 (de) 1981-11-06 1982-09-06 Unterdruckkupplung fuer vakuumverfestigte giessformen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813144118 DE3144118A1 (de) 1981-11-06 1981-11-06 Unterdruckkupplung fuer vakuumverfestigte giessformen
DE3144118 1981-11-06

Publications (2)

Publication Number Publication Date
EP0078897A1 EP0078897A1 (de) 1983-05-18
EP0078897B1 true EP0078897B1 (de) 1986-04-16

Family

ID=6145785

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82108197A Expired EP0078897B1 (de) 1981-11-06 1982-09-06 Unterdruckkupplung für vakuumverfestigte Giessformen

Country Status (3)

Country Link
EP (1) EP0078897B1 (enrdf_load_stackoverflow)
AT (1) ATE19211T1 (enrdf_load_stackoverflow)
DE (2) DE3144118A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3345598A1 (de) * 1983-12-16 1985-06-27 Heinrich Wagner Sinto Maschinenfabrik GmbH, 5928 Laasphe Unterdruckkupplung
DK489886A (da) * 1986-10-14 1988-04-15 Dansk Ind Syndikat Anlaeg med en kraftdreven griber og et antal gribeobjekter, navnlig til brug i et automatiseret stoeberianlaeg, med fluidumforbindelse mellem griberen og et deraf grebet gribeobjekt

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
DE2407264C2 (de) * 1974-02-15 1975-07-17 Heinrich Wagner, Maschinenfabrik, 5928 Laasphe Vorrichtung für die Herstellung und zum Umsetzen von Gießformen
JPS5440419Y2 (enrdf_load_stackoverflow) * 1976-03-15 1979-11-28
DE3039394C2 (de) * 1980-10-18 1987-04-02 Heinrich Wagner Maschinenfabrik GmbH & Co, 5928 Laasphe Unterdruckanschluß für vakuumverfestigte Gießformen

Also Published As

Publication number Publication date
ATE19211T1 (de) 1986-05-15
DE3144118A1 (de) 1983-05-19
EP0078897A1 (de) 1983-05-18
DE3270639D1 (en) 1986-05-22
DE3144118C2 (enrdf_load_stackoverflow) 1989-09-21

Similar Documents

Publication Publication Date Title
DE2615986C2 (de) Verfahren zur Herstellung einer hydraulischen Ausrückvorrichtung und hydraulische Ausrückvorrichtung für Reibkupplungen
DE69007660T2 (de) Hydraulisches Komprimierwerkzeug mit Druckentlastungs- und Überdruckventil.
DE69512078T2 (de) Verfahren zum entfernen eines beidseitig offenen faltenbalges aus einer spritzgiessform
DE4302798C1 (de) Ventileinrichtung zum Entlüften von Druckgiessformen
DE2751431C2 (de) Entlüftungsventil für Druckgießformen
DE2908515C2 (enrdf_load_stackoverflow)
DE3325424C2 (enrdf_load_stackoverflow)
DE69524438T2 (de) Füll- und druckaufschlagseinrichtung
DE3049110A1 (de) Pneumatisches dreiwege-ventil
DE3725414C2 (enrdf_load_stackoverflow)
DE1751816A1 (de) Zylindervorrichtung mit Doppelhub
EP0078897B1 (de) Unterdruckkupplung für vakuumverfestigte Giessformen
DE19605727A1 (de) Vakuum-Druckgießmaschine
DE2335530A1 (de) Hauptzylinder
DE3151403C2 (enrdf_load_stackoverflow)
DE2951232A1 (de) Magnetventil
DE3205155A1 (de) "durch ein gasfoermiges stroemungsmedium betaetigbare servoeinrichtung zum schalten von aggregaten"
DE3002850A1 (de) Geberzylinder
DE3442786A1 (de) Hauptbremszylinder fuer zweikreis-bremsanlagen
DE2157347A1 (de) Ventil, insbesondere für hydraulisch betätigbare Kraftfahrzeugbremsanlagen
DE3804455C2 (enrdf_load_stackoverflow)
DE2933115C2 (de) Kupplungsvorrichtung zum lösbaren Anschluss einer Zweigleitung an eine Versorgungsleitung
DE2460344A1 (de) Hydraulischer druckerzeuger
DE1000245B (de) Arbeitszylinder, insbesondere fuer Druckluftbremsanlagen in Kraftfahrzeugen
DE1550511A1 (de) Absperrschieber

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19831006

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: HEINRICH WAGNER SINTO MASCHINENFABRIK GMBH

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 19211

Country of ref document: AT

Date of ref document: 19860515

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3270639

Country of ref document: DE

Date of ref document: 19860522

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860911

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19890906

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890930

BERE Be: lapsed

Owner name: HEINRICH WAGNER SINTO MASCHINENFABRIK G.M.B.H.

Effective date: 19890930

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900930

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910802

Year of fee payment: 10

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19920401

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920906

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920906

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930916

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930924

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19931018

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940907

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19940930

Ref country code: CH

Effective date: 19940930

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19941124

Year of fee payment: 13

EAL Se: european patent in force in sweden

Ref document number: 82108197.3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950531

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 82108197.3

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960601