US3880223A - Apparatus for automatically producing mold parts - Google Patents

Apparatus for automatically producing mold parts Download PDF

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Publication number
US3880223A
US3880223A US290369A US29036972A US3880223A US 3880223 A US3880223 A US 3880223A US 290369 A US290369 A US 290369A US 29036972 A US29036972 A US 29036972A US 3880223 A US3880223 A US 3880223A
Authority
US
United States
Prior art keywords
chamber
mold
supply bin
pressurized air
filling operation
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
US290369A
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English (en)
Inventor
Marius Gunnergaard
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.)
Dansk Industri Syndikat AS
Dansk Landbrugs Grovvareselskab AMBA
Original Assignee
Dansk Landbrugs Grovvareselskab AMBA
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 Dansk Landbrugs Grovvareselskab AMBA filed Critical Dansk Landbrugs Grovvareselskab AMBA
Priority to US05/530,428 priority Critical patent/US3965961A/en
Application granted granted Critical
Publication of US3880223A publication Critical patent/US3880223A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • an automatic mold part producing apparatus having a mold chamber which is filled with mold forming material that subsequently is compressed between a pair of opposite end walls or pattern boards, the mold forming material is forced into said mold chamber by means of pressurizedair, the pressure of which is gradually or stepwise increased during the chamber filling operation, for the purpose of achieving uniform compactness or density of the mold forming material throughout the height of the mold chamber.
  • This invention relates to a method of operating automatic mold part producing apparatus comprising a pressing chamber which. on one side. is closed by a pressure plate or pattern board that reciprocally is displaceable in the axial direction and. on the other side, by a counterpressure plate or pattern board which. for preference. remains stationary during the pressing operation. Through one or more passage apertures the chamber communicates with a supply bin for sand or similar mold forming material which is forced into and fills the mold chamber and subsequently is compressed by the movement of the pressure plate towards the counterpressure plate.
  • the mold chamber of this machine is. in its top and/or side walls, provided with one or more slots through which the sand from the supply bin is forced into the mold chamber. for instance, by means of centrifugal impellers or by the use of pressurized air.
  • the supply bin When pressurized air is used for this purpose, the supply bin, after having received the requisite quantity of sand. is hermetically sealed off from the surroundings. Following this. the upper part of the supply bin is connected to a pressurized air tank so that the air pressure will force the sand into the mold chamber until it is filled.
  • the varying compactness of the sand results in a varying resilience in the mold part when relieved from pressure by the backward motion of the pressure plate.
  • the pressurerelieved mold part will have a slightly greater thickness at the bottom than at the top and. when assembling a series of such mold parts so as to form a coherent string of molds. it will not in all circumstances be possible to ensure the desired tightness at the contact faces between the individual mold parts.
  • the invention also relates to an apparatus intended for carrying out the new method explained above.
  • This apparatus comprises a supply bin which is connected with either at least one pressurized air tank via at least two valves that can be successively opened, or with at least two separate pressurized air tanks via individual valves that can be successively opened. or with at least one pressurized air tank via an adjustable valve which is controlled in such a way that its flow area increases while the mold chamber is being filled.
  • Each of the alternative embodiments is easy to realize in practice and each renders the desired increase in the air pressure possible during the filling of the mold chamber, if so required, in an automatic or semiautomatic manner.
  • FIG. 1 is a longitudinal sectional view through the relevant components of an embodiment of the apparatus.
  • FIGS. 2, 3 and 4 are diagrammatic plan views of the apparatus in three different embodiments.
  • FIG. 1 a mold chamber C having side walls 1, a bottom 2 and a top wall 3, as well as two end walls that are constituted by a counterpressure plate 4 and a pressing plate or ram 5, respectively. These two end walls 4 and 5 each carry a pattern plate 6 and a model part 7.
  • the mold chamber C can receive sand or similar mold part material from a hopper-like supply bin 9 that is assumed to be filled with sand up to the level 10 shown in broken lines.
  • supply bin 9 is sealed off from the surroundings but, via one or more ducts 11 with a valve 12, it communicates with one or more pressurized air tanks 13.
  • the apparatus is provided with two pressurized air tanks 13 which through individual ducts 11a and 11b with associated valves 12a and 12b are connected to supply bin 9.
  • valve 12a is assumed to be open and, furthermore. the two pressurized air tanks 13 are assumed to have a uniform starting pressure.
  • valve 12b is also opened, whereby it is possible to achieve a pressure increase above the sand in supply bin 9, such pressure increase requiring an increasing supply of air per unit of time inasmuch as the volume above the sand in creases gradually as mold chamber C is being filled.
  • valves 12a and 12b maythen be operative alternatively so that only one of these valves is open at a time.
  • the flow capacity of the valves can be adjusted at will
  • the supply bin 9 is connected with two ducts 11a and 11b with valves 12a and 12b, but these ducts communicate with a common pressurized air tank 13. The operation can proceed as explained in connection with FIG. 2.
  • the supply bin 9 communicates with a single pressurized air tank 13 via a single duct 11 fitted with an adjustable valve 120. It is possible for this valve to be controlled according to a predetermined program with a view to changing the flow area, or else it may be controlled dependently upon the pressure actually prevailing inside supply bin 9 and pressurized air tank 13 in a way so as to achieve the desired filling process of'mold chamber C.
  • Apparatus for' automatically producing mold parts comprising a horizontally disposed mold chamber naving a pair of opposite, end walls of which at least one is axially displaceable, a mold material supply bin above said chamber, at least one passage opening means forming communication between the top of said mold chamber and the bottom of said supply bin for vertically supplying material from said bin to said chamber, and at least one pressurized air tank communicating with said supply bin above the normal level of material therein through valve-means for supplying air acting on said supplied material in two successively increasing pressure stages during the chamber filling operation.
  • valve means comprises at least one adjustable valve having a flow area that is increased during the chamber filling operation.
  • Apparatus according to claim 2 comprises at least two pressurized air tanks communicating with said supply bin through individual and successively operated valves.
  • valve means comprises two successively operated valves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
US290369A 1971-09-23 1972-09-19 Apparatus for automatically producing mold parts Expired - Lifetime US3880223A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/530,428 US3965961A (en) 1971-09-23 1974-12-06 Method of operating automatic mold part producing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK465171AA DK125828B (da) 1971-09-23 1971-09-23 Fremgangsmåde ved drift af automatiske formpartfremstillingsmaskiner og maskine til brug ved denne fremgangsmåde.

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/530,428 Division US3965961A (en) 1971-09-23 1974-12-06 Method of operating automatic mold part producing apparatus

Publications (1)

Publication Number Publication Date
US3880223A true US3880223A (en) 1975-04-29

Family

ID=8135465

Family Applications (1)

Application Number Title Priority Date Filing Date
US290369A Expired - Lifetime US3880223A (en) 1971-09-23 1972-09-19 Apparatus for automatically producing mold parts

Country Status (14)

Country Link
US (1) US3880223A (cs)
JP (1) JPS514938B2 (cs)
BE (1) BE788716A (cs)
CA (1) CA975130A (cs)
CH (1) CH551237A (cs)
CS (1) CS190373B2 (cs)
DD (1) DD100647A5 (cs)
DK (1) DK125828B (cs)
ES (1) ES406926A1 (cs)
FR (1) FR2153298B1 (cs)
GB (1) GB1404052A (cs)
IT (1) IT988399B (cs)
NL (1) NL7212853A (cs)
SU (1) SU820648A3 (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072254A1 (en) * 1981-08-11 1983-02-16 Dependable-Fordath Inc. Moulding apparatus
WO1991000156A1 (fr) * 1989-06-29 1991-01-10 NAUCHNO-PROIZVODSTVENNOE OBIEDINENIE TEKHNOLOGII AVTOMOBILNOI PROMYSHLENNOSTI (NPO 'NIITavtoprom') Procede et dispositif de fabrication de moules a coulage unique
US20020142919A1 (en) * 2000-07-27 2002-10-03 Constien Vernon George Product for coating wellbore screens
CN114713777A (zh) * 2022-04-15 2022-07-08 苏州明志科技股份有限公司 一种超大型射芯机射芯装置及其控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51149189A (en) * 1975-06-17 1976-12-21 Mitsubishi Chem Ind Ltd Process for separation of metallic ions
CH682547A5 (de) * 1990-04-20 1993-10-15 Fischer Ag Georg Verfahren und Vorrichtung zum Verdichten von körnigen Formstoffen.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274651A (en) * 1965-03-29 1966-09-27 Oliveira Fabio De Azevedo Method for injecting sand in moulding machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274651A (en) * 1965-03-29 1966-09-27 Oliveira Fabio De Azevedo Method for injecting sand in moulding machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072254A1 (en) * 1981-08-11 1983-02-16 Dependable-Fordath Inc. Moulding apparatus
WO1991000156A1 (fr) * 1989-06-29 1991-01-10 NAUCHNO-PROIZVODSTVENNOE OBIEDINENIE TEKHNOLOGII AVTOMOBILNOI PROMYSHLENNOSTI (NPO 'NIITavtoprom') Procede et dispositif de fabrication de moules a coulage unique
US5161603A (en) * 1989-06-29 1992-11-10 Volkomich Anatoly A Method for production of single-use foundry molds and apparatus for realization thereof
US20020142919A1 (en) * 2000-07-27 2002-10-03 Constien Vernon George Product for coating wellbore screens
CN114713777A (zh) * 2022-04-15 2022-07-08 苏州明志科技股份有限公司 一种超大型射芯机射芯装置及其控制方法
CN114713777B (zh) * 2022-04-15 2024-03-15 苏州明志科技股份有限公司 一种超大型射芯机射芯装置及其控制方法

Also Published As

Publication number Publication date
ES406926A1 (es) 1975-09-16
JPS4918719A (cs) 1974-02-19
BE788716A (fr) 1973-01-02
NL7212853A (cs) 1973-03-27
SU820648A3 (ru) 1981-04-07
DK125828B (da) 1973-05-14
GB1404052A (en) 1975-08-28
JPS514938B2 (cs) 1976-02-16
DE2246189A1 (de) 1973-04-05
CH551237A (de) 1974-07-15
IT988399B (it) 1975-04-10
FR2153298A1 (cs) 1973-05-04
CA975130A (en) 1975-09-30
CS190373B2 (en) 1979-05-31
FR2153298B1 (cs) 1976-01-23
DD100647A5 (cs) 1973-10-05
DE2246189B2 (de) 1976-04-22

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