EP0203322A1 - Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression - Google Patents

Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression Download PDF

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Publication number
EP0203322A1
EP0203322A1 EP86104663A EP86104663A EP0203322A1 EP 0203322 A1 EP0203322 A1 EP 0203322A1 EP 86104663 A EP86104663 A EP 86104663A EP 86104663 A EP86104663 A EP 86104663A EP 0203322 A1 EP0203322 A1 EP 0203322A1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
medium cylinder
accumulator
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.)
Granted
Application number
EP86104663A
Other languages
German (de)
English (en)
Other versions
EP0203322B1 (fr
Inventor
Norbert Damm
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.)
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach 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 Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0203322A1 publication Critical patent/EP0203322A1/fr
Application granted granted Critical
Publication of EP0203322B1 publication Critical patent/EP0203322B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor

Definitions

  • the invention relates to a device for compressing foundry molding material by means of compressed gas, consisting of a pressure vessel forming a pre-pressure chamber for the compressed gas, a molding space arranged underneath from a molding box with a filling frame and a model plate with a model that closes the molding box below, onto which the molding material is compressed is loosely heaped up, and a large-area valve arranged between the pressure vessel and the mold space, the closure member of which is connected to a pressure medium cylinder as a drive, suddenly releases the valve opening in the pressure vessel, moves into the pre-pressure space and can be brought into the closed position by means of the pressure medium cylinder.
  • outlet pressures which are in the range of the pressure of operational compressed air networks in order not to have to undertake any great design effort on the one hand for the production of compressed gas and on the other hand for the control of the pressure.
  • the device must have a closure member which on the one hand closes the largest possible cross section for overflowing the compressed gas and on the other hand has the lowest possible mass in order to release the cross section as quickly as possible.
  • This also requires opening drives which bring the closure member into the open position in a few milliseconds and thus release the cross section. The aforementioned requirements cannot be achieved with conventional valve designs.
  • the invention therefore is based on a known device, in which the closure member opens in the pre d jerk space and vice versa by means of a pressure medium cylinder from the closed to the open position and so that a dead space can be avoided within the mold space.
  • a known device in which the closure member opens in the pre d jerk space and vice versa by means of a pressure medium cylinder from the closed to the open position and so that a dead space can be avoided within the mold space.
  • the invention has for its object to develop the device described above so that a lower opening effort for the closure member is achieved with less design effort and a gas pressure that is in the area of the network d rucksack conventional compressed air networks.
  • the piston of the pressure medium cylinder on the hub side forms the movable end of a gas-loaded pressure accumulator and is connected with its opposite side to a hydraulic high-pressure source, and in that the high-pressure side drain is designed such that the pressure medium with a Speed> 10 m / s runs with simultaneous acceleration of the piston under the pressure in the pressure accumulator and the closure member into the raised open position.
  • the function of the device according to the invention is as follows: The closing member is closed against the at least partially relieved pressure accumulator under the effect of the pressure from the hydraulic high pressure source. To open the closure member, the pressure accumulator is brought to the working pressure with the high-pressure circuit shut off at the same time on the opposite side of the piston, then the high-pressure side is opened so that the hydraulic fluid runs out of the pressure medium cylinder at a speed greater than 10 m / s and the piston underneath the closure member the high-pressure gas pressure suddenly rises so that it opens in a few milliseconds against the working pressure in the pressure vessel.
  • this discharge speed must be> 10 m / s, that is to say in a range which is 10 times higher than the return oil speeds customary in hydraulics.
  • This significantly higher discharge velocity for the displacement volume can be achieved by appropriate design measures.
  • the piston speed itself can only achieve values in the range of approx. 5 m / sec. to reach.
  • the pressure medium cylinder high-3 on the pressure side has a small displacement volume of, for. B. 150 to 500 cm.
  • the high-pressure side drain is decoupled from the other high-pressure circuit and connected to a drain tank via a line of relatively large cross-section.
  • the flow resistance for the displacement volume that is running is as low as possible kept, on the other hand, the decoupling from the other high-pressure circuit ensures that the amount of pressure medium to be displaced is small.
  • the drain tank gives the possibility to get a quick pressure reduction on the drain side.
  • the pressure accumulator the pressure of which acts on the stroke side of the piston, is in the closed position of the closing morning, that is to say in the raised end position of the piston under a gas pressure between 20 and 50 bar, which is directly or indirectly, for. B. via a Hy d raulikpolster, acts on the piston. From approx. 50 bar, the effect of a gas pressure pot, which in principle is already present even at lower pressures, advantageously increases sharply in the sense of an additional acceleration.
  • the final pressure is between 100 and 300 bar.
  • the ratio of pressure accumulator volume to displacement volume of the pressure medium cylinder is at least 5: 1, preferably 10: 1 to 15: 1.
  • the pressure accumulator consists of a cylinder filled with gas and closed by a movable piston, which is connected on the gas pressure side opposite to a hydraulic high pressure source, by means of which the gas pressure accumulator is connected to that for the opening pressure source, by means of which the gas pressure accumulator can be brought to the final pressure necessary for the opening movement.
  • the device according to the invention is further characterized by a throttle which becomes effective towards the end of the stroke movement of the piston of the pressure medium cylinder and ensures that the piston and thus the closure member are braked over a short distance.
  • the high pressure source is connected to the pressure medium cylinder via a control slide, a check valve il and a ring line, and that the ring line is connected to the drain tank via a controllable check valve.
  • the ring line has the largest possible cross section in order to allow the pressure medium to drain off quickly.
  • control slide connects the pressure medium cylinder to the high pressure source in a first position and opens the control line of the controllable check valve so that it closes and connects the control line to the high pressure source in a second position, so that the check valve opens against the pressure in the branch line and connects the pressure medium cylinder to the drain tank.
  • the pressure accumulator is connected to the hydraulic high-pressure source via a control slide and that the control slide connects the pressure accumulator to the hydraulic source in a first position, so that the gas in the pressure accumulator and on the stroke side in the pressure medium cylinder with a simultaneously present high pressure which is compressed to the final pressure on the opposite side of the piston of the pressure medium cylinder, and connects in a second position to an outlet tank.
  • a pressure vessel 5 - in the illustrated embodiment for receiving compressed air - which is connected via a connection 6 from a pressure accumulator or - at low admission pressure - is fed from the company's compressed air network.
  • the pressure vessel has a plate 7 which is provided with a plurality of openings 8 in a rust-like manner in the area above the molding space.
  • a frame 9 is flanged to the top of the base 7, to which an exhaust air line with a valve 10 is in turn connected.
  • the pressure vessel 5 with the frame 9 on the one hand and the model plate 1 with model 2, molding box 3 and filling frame 4 are mutually movable in order to be able to fill the molding space with molding material to just below the bottom 7. Before the compression, these two assemblies are brought together and pressed tightly together at their interface.
  • the pressure medium cylinder 16 has a gas pressure chamber 24 below the piston 15, which is connected to a gas pressure accumulator 25.
  • This gas pressure accumulator 25 is divided into a gas pressure chamber 27 and a hydraulic pressure chamber 28 by a movable piston 26.
  • the Hydraulic pressure chamber 28 is connected via a control slide 29 to a high-pressure source 30, which is fed from the supply tank 18.
  • the piston 15 of the pressure medium cylinder 16 is extended on the hydraulic side with a piston rod 31 which extends through the working space 22.
  • This upper piston rod 31 carries a cylindrical shoulder 32 and a conically tapered shoulder 33 directly on the shoulder of the piston 15, which forms a throttle with the cylindrical constriction 34 during the upward stroke movement of the piston 15.
  • the hydraulic line 21 is connected to a branch line 35 which leads to the controllable check valve 23, the control line 36 of which can be connected to the pressure source 17 via the control slide 19.
  • the pressure medium chamber is connected via the lines 21 and 35 to an outlet tank 37 and a vent line 38 in a pressure-relieved manner.
  • the drain line 39 of the drain tank 37 opens into the hydraulic tank 18th
  • the valve 10 is in the closed position. After bracing the molding device 1, 3, 4 with the frame 9, the control slide 29 is brought into the scarf position "B". The hydraulic chamber 28 of the gas pressure accumulator 25 is thereby switched to the high pressure source 30. The gas pressure chambers 27 and 24 are compressed to an operating pressure of approx. 200 ⁇ 250 bar. At this time, the valve plate 11 is in a highly preloaded state, but is still blocked on the side of the pressure chamber 40.
  • the valve plate 11 To suddenly relax the pressure vessel 5 and to compress the molding material present in the molding box and filling frame, the valve plate 11 must be brought into the open position (left half of FIG. 1). For this purpose, the control slide 19 is switched to the "A" position. There is then the pressure of the pressure source 17 in the control line 36, so that the check valve 23 opens. About the relatively large drain cross-sections of the lines 21, 35, the pressure medium from the working chamber 22 under the action of the pressure accumulator 24 from the check valve 23 in the drain tank 37 from. Towards the end of the lowering movement of the piston 15, the discharge cross section between the piston rod 31 and the constriction 34 is reduced by the conical extension 33 on the piston rod 31, so that the piston and thus the valve plate 11 are braked.
  • the pressure medium to be displaced runs out of the working space 22 at a speed of more than 10 m / s, preferably between 20 and 30 m / s.
  • the demandingtan k 37 can be vented between the work cycles via line 38, so that its content can flow into the system tank 18.
  • valve plate 11 After compression of the molding material, the valve plate 11 is first brought into the closed position as above. The pressure chamber 40 created below the fixed base plate 7 is vented via the valve 10. After the separation of model and compact form, a new work cycle begins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)
EP86104663A 1985-05-25 1986-04-05 Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression Expired EP0203322B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853518980 DE3518980A1 (de) 1985-05-25 1985-05-25 Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
DE3518980 1985-05-25

Publications (2)

Publication Number Publication Date
EP0203322A1 true EP0203322A1 (fr) 1986-12-03
EP0203322B1 EP0203322B1 (fr) 1988-11-23

Family

ID=6271729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104663A Expired EP0203322B1 (fr) 1985-05-25 1986-04-05 Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression

Country Status (6)

Country Link
US (1) US4846253A (fr)
EP (1) EP0203322B1 (fr)
JP (1) JP2553044B2 (fr)
DD (1) DD247161A5 (fr)
DE (2) DE3518980A1 (fr)
DK (1) DK241886A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
ES2012702A6 (es) * 1989-04-06 1990-04-01 Erana Agustin Arana Mejoras en maquinas de moldeo de cajas de arena por impacto de aire.
CH686412A5 (de) * 1992-03-10 1996-03-29 Fischer Georg Giessereianlagen Verfahren zum Verdichten von Formsand fuer Giessformen.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062331A1 (fr) * 1981-04-02 1982-10-13 BMD Badische Maschinenfabrik Durlach GmbH Procédé et dispositif de compactage pneumatique de sable de moulage
EP0084627A1 (fr) * 1981-12-28 1983-08-03 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour comprimer du matériel de moulage pour fonderies
EP0129210A2 (fr) * 1983-06-15 1984-12-27 BMD Badische Maschinenfabrik Durlach GmbH Machine pour compacter du matériau de moulage de fonderie

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU425719A1 (fr) * 1972-07-17 1974-04-30 институт машиностроени
SU521993A1 (ru) * 1974-04-02 1976-07-25 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Импульсна головка
DE2727297C3 (de) * 1976-06-25 1980-07-10 Georg Fischer Ag, Schaffhausen (Schweiz) Verfahren und Einrichtung zum Herstellen von Gießereisandformen
SU793696A1 (ru) * 1979-03-19 1981-01-07 Краматорский Научно-Исследовательскийи Проектно-Технологический Институтмашиностроения Импульсна головка
DE3243951A1 (de) * 1981-12-28 1983-07-07 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Verfahren und vorrichtung zum verdichten von giesserei-formstoff
CH657790A5 (de) * 1982-10-27 1986-09-30 Fischer Ag Georg Vorrichtung zum verdichten von koernigen formstoffen.
DE3321955A1 (de) * 1983-06-18 1984-12-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062331A1 (fr) * 1981-04-02 1982-10-13 BMD Badische Maschinenfabrik Durlach GmbH Procédé et dispositif de compactage pneumatique de sable de moulage
EP0084627A1 (fr) * 1981-12-28 1983-08-03 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour comprimer du matériel de moulage pour fonderies
EP0129210A2 (fr) * 1983-06-15 1984-12-27 BMD Badische Maschinenfabrik Durlach GmbH Machine pour compacter du matériau de moulage de fonderie

Also Published As

Publication number Publication date
JPS61269959A (ja) 1986-11-29
DE3661242D1 (en) 1988-12-29
DK241886D0 (da) 1986-05-23
EP0203322B1 (fr) 1988-11-23
DE3518980C2 (fr) 1993-01-21
DD247161A5 (de) 1987-07-01
DK241886A (da) 1986-11-26
DE3518980A1 (de) 1986-11-27
JP2553044B2 (ja) 1996-11-13
US4846253A (en) 1989-07-11

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