US3788790A - Machine for casting under pressure - Google Patents

Machine for casting under pressure Download PDF

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Publication number
US3788790A
US3788790A US00227882A US3788790DA US3788790A US 3788790 A US3788790 A US 3788790A US 00227882 A US00227882 A US 00227882A US 3788790D A US3788790D A US 3788790DA US 3788790 A US3788790 A US 3788790A
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US
United States
Prior art keywords
mold
movable
enclosure
chamber
stationary
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
US00227882A
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English (en)
Inventor
A Balevsky
I Nikolov
D Nenov
E Momchilov
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NIITM PRI BAN
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NIITM PRI BAN
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 NIITM PRI BAN filed Critical NIITM PRI BAN
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Publication of US3788790A publication Critical patent/US3788790A/en
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • the present invention relates to an apparatus for casting under pressure and, more particularly, to a system for casting high-volatility metals and other materials, e.g. synthetic resins, and substances which decompose at low pressures and at melting temperatures in a mold under counterpressure.
  • high-volatility metals and other materials e.g. synthetic resins, and substances which decompose at low pressures and at melting temperatures in a mold under counterpressure.
  • the mold is located in a chamber which should be easily opened and closed for extracting the castings and which must be closed by a force exceeding that generated by the counterpressure against which the metal or other substance is cast in the mold.
  • this increased force cannot be produced by the low-power actuating elements used for opening and closing the chamber and a special locking device may be required for the two parts of the mold.
  • This device must provide a sealing of the mold halves together at their parting surfaces and be capable of absorbing the force generated by a large number of movable mechanically and thermally stressed members. Moreover, strict coordination is requiredbetween the action of the locking device and the remaining parts of the machine to avoid the buildup of pressure within the machine before the locking process is completed and to unlock the machine before the pressure'has been fully relieved. The reliability and safety of the operation of the machine depends on such coordination. In order to provide such coordination, the complexity of the mechanism has been increased and casting machines have been provided heretofore with automatic elements which inherently increase operations auxiliary to the casting step and increase the duration of each casting cycle to the detriment of productivity of the apparatus.
  • Still another object of the invention is to provide an improved apparatus for the counterpressure casting of SUMMARY OF THE INVENTION
  • a chamber receiving the mold which consists of two generally cylindrical enclosures telescopically movable with respect to-one another, one of the enclosures being rigidly connected to the body of the machine while the other may be raised and lowered by an actuating mechanism, preferably together with the other mold half in order simultaneously to permit the closure of the chamber and the mold.
  • the movable enclosure has a diameter smaller than the diameter of the outer enclosure in which it moves in such manner that the compressed gas delivered to the closed chamber produces of itself the necessary closing force in accordance with the difference between the diameters of the two enclosures.
  • the movable enclosure constitutes a differential piston which is displaced and retained, in part, by the gas pressure within the chamber.
  • a horizontal and movable plate 1 forming an upper support and mounted upon a plurality of posts 10 angularly spaced about the axis A of the machine.
  • Attached rigidly to the upper plate is a hydraulic cylinder 2 whose piston rod 2a is connected to an upper mold half 6 cooperating with a lower mold half 11 mounted upon another stationary plate 12 carried by a cylindrical outer wall 13 forming an enclosure or a mass 14 of thermally insulating material.
  • a chamber 15 within this mass is provided with a pedestal 16 on which is supported a molten metal ladle or crucible 17 containing a bath 18 of the molten material to be cast.
  • the mold chamber is defined by a fixed enclosure mounted upon the plate 1 and depending therefrom, while being of generally cylindrical configuration with an inwardly extending frustoconical lip 3a.
  • the latter supports a rubber sealing ring 4 upon which an outwardly turned lip 5a of the lower movable enclosure 5 may come to rest.
  • the latter is vertically shiftable in enclosure 3 and thus is telescopically movable relative thereto.
  • An inwardly extending flange 5b of the movable enclosure 5 is bolted at SC to an outwardly extending flange 6a to the mold which is provided with vertically movable ejector pins 6b adapted to engage stops la depending from the plate 1 in a fully elevated position of the mold half 6.
  • the flanges 6a and 5b define a mold compartment 7 which is at a pressure different from the pressure in the chamber thereabove as will be apparent hereinafter and is also different from the pressure in chamber 9 above the bath 18.
  • the movable enclosure 5 moreover, has an inwardly extending sealing lip 5d adapted to rest upon a rubber sealing ring 8 which, in turn, is seated against a frustocone 21a of the upwardly extending stationary apron 21 rising from plate 12.
  • the portion of the movable enclosure 5 exposed to gas pressure in chamber 20 has a diameter D which is in excess of the diameter D of the portion of the movable enclosure in chamber 7.
  • Pressure may be supplied by a compressor represented generally at 22 to chamber 20 via a valve 23, to chamber 7 via a valve 24 and to chamber 9 via a valve 25.
  • the pistonrod 2a may be elevated to raise the mold half 6 and enclosure 5. until ejectors 6b release the previous workpiece, the lowered end of enclosure 5 being lifted from the apron 21 to allow removal of this cast body.
  • chamber 7 and chamber 9 may be pressurized with gas at a differential such that the molten material from bath 18 is driven upwardly through the tube 19 into the mold. Because of the differential piston effect, the pressure in chamber 7 which exceeds ambient pressure acts to retain the mold in its locked position without any additional means. This pressure may be increased by allowing the pressure in chamber 20 'to equal that in chamber 7 or applying a higher pressure in chamber 20. After the mold has been filled, the cycle is repeated and the pressure relieved, e.g. through an venting valve 26.
  • An apparatus for casting under counter pressure comprising a mold having at least one movable mold' ends and exposed to the pressures in said chambers to constitute a differential piston retaining said mold chamber closed upon differential pressurization of said chambers, said movable mold member being connected to said movable enclosure and displaceable therewith.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US00227882A 1971-02-20 1972-02-22 Machine for casting under pressure Expired - Lifetime US3788790A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG1686571 1971-02-20

Publications (1)

Publication Number Publication Date
US3788790A true US3788790A (en) 1974-01-29

Family

ID=3897650

Family Applications (1)

Application Number Title Priority Date Filing Date
US00227882A Expired - Lifetime US3788790A (en) 1971-02-20 1972-02-22 Machine for casting under pressure

Country Status (5)

Country Link
US (1) US3788790A (es)
DE (1) DE2207786A1 (es)
FR (1) FR2125399B1 (es)
GB (1) GB1377444A (es)
IT (1) IT961278B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4921417A (en) * 1987-10-05 1990-05-01 Sato Factory Co., Ltd. Molding apparatus for molding a clay pigeon

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112935223A (zh) * 2019-12-11 2021-06-11 科华控股股份有限公司 真空吸铸压型气缸改装在吸铸室外以避免密封失效的结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196501A (en) * 1961-01-26 1965-07-27 Balgarska Akademia Na Naukite Apparatus and method for metal casting
US3532154A (en) * 1966-09-15 1970-10-06 Inst Po Metalloznanie I Tekno Method and apparatus for casting utilizing fluid pressure differentials
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196501A (en) * 1961-01-26 1965-07-27 Balgarska Akademia Na Naukite Apparatus and method for metal casting
US3532154A (en) * 1966-09-15 1970-10-06 Inst Po Metalloznanie I Tekno Method and apparatus for casting utilizing fluid pressure differentials
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4921417A (en) * 1987-10-05 1990-05-01 Sato Factory Co., Ltd. Molding apparatus for molding a clay pigeon

Also Published As

Publication number Publication date
FR2125399B1 (es) 1977-12-23
DE2207786A1 (de) 1972-10-19
SU438160A3 (ru) 1974-07-30
IT961278B (it) 1973-12-10
GB1377444A (en) 1974-12-11
FR2125399A1 (es) 1972-09-29

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