US2792600A - Method of and apparatus for the production of cores, shell moulds or the like for casting purposes - Google Patents

Method of and apparatus for the production of cores, shell moulds or the like for casting purposes Download PDF

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Publication number
US2792600A
US2792600A US438564A US43856454A US2792600A US 2792600 A US2792600 A US 2792600A US 438564 A US438564 A US 438564A US 43856454 A US43856454 A US 43856454A US 2792600 A US2792600 A US 2792600A
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United States
Prior art keywords
container
compressed air
piston
air
cores
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Expired - Lifetime
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US438564A
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English (en)
Inventor
Polzguter Franz
Pohlandt Walter
Linnewch Kurt
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.)
Deutsche Edelstahlwerke AG
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Deutsche Edelstahlwerke AG
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.)
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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
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B22C15/245—Blowing tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding

Definitions

  • the present invention relates to a method of and apparatus for the production of cores, shell m'oulds or the like for casting purposes whereby the moulding material is blown into or on to the core box or mould by compressed air.
  • Blowing apparatus of this type have been evolved more particularly for the production of cores, and relatively high pressures are used in this operation, so that the moulding material is said to be shot into the core boxes.
  • Such apparatus comprises essentially a pressun'sed container (hereinafter called the sand container) from which the material, which is sand or a mixture of sand and a synthetic binder, for example synthetic resin, is shot into or on to the core box or mould.
  • a tube projecting into the material leads to the blowing station, i. e., where the material is delivered into or on to the core box or mould, e. g., where the core box is fitted in a sealed relation to the apparatus, and another tube so extends into the container as to terminate above the material therein. If the container is subjected to pressure through the medium of air under pressure supplied by the last-mentioned tube or pipe, material is forced through the other tube or pipe to the blowing station.
  • the invention aims to obviate or lessen these disadvantages. It is more particularly the intention to provide an apparatus which permits of sudden or impacting delivery of the material from the sand container to the blowing station, with little or no risk of the components of the material separating. It is also the intention so to construct the apparatus that the quantity of compressed air can be regulated by simple control means.
  • the invention proposes to dispose a deflector, e. g., a part-spherical plate, above the material in the sand container and to arrange the compressed air pipe producing the ejection pressure in the said container so that it is directed towards the deflector whereby to spread outwards the compressed air discharged substantially centrally from the pipe and produce substantially uniform pressure on said material whilst suddenly expelling the same.
  • the pressure is therefore delivered to wards the material surface in the manner of a dome and so drives the material through the blow-pipe that little or no eddying and hence little or no air separating or winnowing effect occurs.
  • the charging vessel may be a cylinder containing a piston which is subjected to pressure and which moves, e. g., downwardly under pressure when the supply line to the sand container is opened so that a quantity of air trapped under pressure in the cylinder is suddenly expelled into the sand container aided by the piston pressure.
  • the stroke of the piston can be made adjustable, accurately regulated quantities of air may be supplied to the sand container to enable the material to be forced along the blow pipe and shot into or on to the core box or mould.
  • the compressed air supplied to the sand container at high pressure while the chosen pressure is maintained constant or substantially so, but the quantity of compressed air is also accurately regulated so that compressed air is saved and the blowing time reduced to the lowest possible period.
  • the control device for effectively fulfilling this function is relatively simple and requires little space, and the whole installation may be contained in a closed machine table upon the top of which there are merely the blowing station and clamping means for the core box or mould.
  • blowing station 2 which is formed in the example selected, as a core blowing station.
  • sand container 3 and charging cylinder 4 Located within the closed table 700 (Fig. 3) are the sand container 3 and charging cylinder 4.
  • the material consisting of sand or of a mixture thereof with synthetic resin is indicated at 3a in the shooting container 3.
  • a pipe 5 projecting into the material 3a leads to the core blowing station 2.
  • a compressed air line 6 is led into the vessel 3 from below and is directed towards a part-spherical plate 7 disposed on the cover of the vessel 3.
  • the function of the part-spherical plate 7 towards which the pipe 6 is directed is so to deflect the centrally entering stream of compressed air that the latter presses upon the surface of the material 3a as if contained within a dome or hell and expels the material shot-wise through the pipe 5. Due to the fact that the compressed air, which preferably enters suddenly is deflected into this dome-like or bell-like shape, eddying of the material 3a is prevented or reduced whether the same is dry and ready to trickle or whether it is damp, while a uniform pressure effect is also obtained. In this way the separating even of completely dry materials which may be a mixture of materials of different specific weights is prevented or lessened.
  • the part-spherical plate '7 may also serve as a valve or closure member for the charging aperture 8.
  • a hopper 9 Leading to the latter is a hopper 9, the top of which is covered with a filter 10 on the upper part of the table.
  • the required quantity of material 3a is shaken into the vessel 3 through the said filter, and the material which overshoots during blowing may be shaken back into the vessel 3 through the filter 10.
  • the part-spherical defleeting plate and the associated additional equipment thereof are more clearly apparent in Figure 2.
  • Disposed at the aperture 8 is a packing 11 against which the heavy part-spherical plate 7 bears when in the closed position. The plate 7 is thrust downwardly by the spring-loaded guide 12 so that the aperture 8 is opened for charging the container with material.
  • a spring 13 hearing against the plate 7 depresses the valve 14 for the pipe 6 to prevent material from entering the pipe 6 when the vessel is being charged or when surplus material is being shaken back after each blowing operation. 'When the pipe 6 is subjected to pressure, the valve 14 lifts and thrusts the part-spherical plate 7 against the packing 11 through the medium of the spring 13', and the immediately following stream of compressed air completes the sealing of the plate 7 against the packing ring 11.
  • the apparatus described with the container 3 and the plate 7 is effective even if the container 3 is directly supplied from the compressed air network, ity is particularly advantageous to work with; a regulated quantity of compressed air, and to this end the charging cylinder 4 is disposed before the container 3, the line 6 leading from the cylinder 4 to the container 3.
  • the cylinder 4 is completely enclosed and located therein is a piston 15 which has two packing rings.
  • the line 16 leads to the space above the piston, and the line 17 leads to the space below the piston, the lines 16 and 17 being connected to the compressed air network 19 through a four-way valve 18.
  • the piston has rubber buffers 26 co-operating with rubber buffers 21, 22 which yieldingly arrest the to and fro movements of the piston.
  • the height of the lower rubber butter 22 can be adjusted to some extent.
  • the initial position of the piston can be adjusted by means not shown in detail, so that a predetermined volume of air will be enclosed below the piston. This volume of air is at the pressure of the compressed air network.
  • the pressure can be produced by fitting in the line 6 a three-way valve 23 which closes the line to the charging vessel 3.
  • a relief valve 24 in the form of a flutter valve.
  • the three-way valve 23 and four-way valve 18 are so interconnected that, when the three-way valve 23 is closed, the supply line 17 to the space below the piston 15 is open through the four-way valve 18.
  • the pressure raises the piston 15 into the previously adjusted starting position and a predetermined quantity of compressed air required for the blowing operation is now contained below the piston 15;
  • the three-way valve 23 is opened and the four-way valve simultaneously so shifted that the line 17 is closed and the line 16 opened.
  • the quantity of compressed air below. the piston therefore discharges suddenly into the charging vessel 3 and impels the mateiial to the blowing station.
  • the piston 15 subjected to the pressure of the compressed air network so aids the expulsion of the volume of air into the container 3 that the abrutly expelled volume of air enters the container 3 at a constant pressure.
  • pressures of up. to 6 atmospheres absolute preferably 3 atmospheres absolute, can be employed for the operation.
  • the high pressure together with the sudden or impacting pressure effect makes it possible to produce very thick cores, shell moulds or the like.
  • valves 23 and 18 are reset totheir initial position so that the air space below the piston 15 is again filled with compressed air, the piston 15 rising automatically into its initial position.
  • the necessary pressure discharge from the top to the bottom of the piston is effected through the valve 24.
  • a clamping station 2 for core boxes is illustrated in the constructional example (Fig. l).
  • the core boxes or core dies are clamped between the stationary clamping plate, in which the pipe 5 terminates, and a movable clamping plate 26.
  • the latter can be moved by an air-operated clamping cylinder 27.
  • It has been the general. practice heretofore to provide a core box with air vents (e. g. nozzles) to allow the enclosed air to escape when the material is forced in.
  • the core boxes are at a relatively high temperature in order that the material consisting'of sand and synthetic resin or the like cakes or sets on to the walls when the synthetic resin melts, in order to produce the core shape.
  • the air vents in' a core box of this type become clogged, more particularly when high pressures are used impulse-wise, since the material also sets and cakesin the air nozzles.
  • the latter instead of providing the core boxes with air vents the latter may be located in the clamping plates which remain cool.
  • the stationary clamping plate 25 also containing the pipe 5 has the said air vents so that the enclosed air is expelled rearwardly from the enclosed material.
  • the blowing operation only lasts for a fraction of a second and is effected withoutsubstantial loss of compressed air since the volume of air required can be adjusted, while the excess of non-caking material is also maintained-within narrow limits.
  • the operator removes the blown core box from the clamping device and shakes the small quantity of surplus material through the filter 10 into the hopper 9, whence the said surplus material re-enters the charging vessel 3.
  • a vibrator 28 can be arranged on the hopper 9 in order to ensure regulation of the materialflowing through the hopper.
  • Apparatus for theproduction of cores, shellmclds or the like for casting purposes comprising a sand con tainer, acompressed, air pipe and a deflector having a dished deflecting surface, said pipe extending medially into the container and its'discharge end being directed towards'the medial region of said deflector so tha-twhen the container is charged with the molding material the compressed air will be discharged from the pipe medially on to the deflector above the level of the materialand will spread outwards and downwardly and produce substantially uniform pressure on the material whilst suddenly expelling the same and.
  • Apparatus for the production of cores, shell molds or thelike for casting purposes comprising a sand cons tainer, a compressed air pipe and a deflector, said deflector having a dished deflecting surface, said pipe exrtending medially into the container and its discharge end being directed towards the central region of the concave.
  • the piston-to give rapid movement thereto so thatthe transfer of the said compressed air from .thecylinder to thecon tainer; is rapidly effected and. when the container is charged. with. moldingv material the said compressed air displaced.by..the piston will bedischarged from thepipe medially on totheconcave-face of said deflectorabove the levelof the material in the container and will spread outwards-and downwardly and produce substantiallyimi form pressure on the material suddenly to expel the same and a core-box or mold supporting means and a conduit extending thereto from the lower region of the said eontainer, so that the material expelled will pass through said conduit into or onto the core box or mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
US438564A 1953-06-24 1954-06-22 Method of and apparatus for the production of cores, shell moulds or the like for casting purposes Expired - Lifetime US2792600A (en)

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Application Number Priority Date Filing Date Title
DE322713X 1953-06-24

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US2792600A true US2792600A (en) 1957-05-21

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US438564A Expired - Lifetime US2792600A (en) 1953-06-24 1954-06-22 Method of and apparatus for the production of cores, shell moulds or the like for casting purposes

Country Status (6)

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US (1) US2792600A (en(2012))
BE (1) BE529815A (en(2012))
CH (1) CH322713A (en(2012))
FR (1) FR1102864A (en(2012))
GB (1) GB761491A (en(2012))
LU (1) LU32923A1 (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856653A (en) * 1955-07-22 1958-10-21 Sutter Products Company Method and apparatus for making hollow shell foundry sand articles
US3023467A (en) * 1960-06-16 1962-03-06 Axel H Peterson Core blowing machines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159133B (de) * 1955-07-15 1963-12-12 Ind Foundry Materials Ltd Blasmaschine zur Herstellung von Schalenformen oder -kernen fuer Giessereizwecke

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US611339A (en) * 1898-09-27 Apparatus for inflating pneumatic tires
US2542887A (en) * 1951-02-20 Apparatus for pyrolytic conversion
US2598621A (en) * 1948-04-02 1952-05-27 Taccone Pneumatic Foundry Equi Machine for blowing sand into molds
US2692409A (en) * 1952-07-05 1954-10-26 Fed Supply Company Sand blowing apparatus for molds and cores
US2724878A (en) * 1952-06-13 1955-11-29 Emery I Valyi Mold-forming machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US611339A (en) * 1898-09-27 Apparatus for inflating pneumatic tires
US2542887A (en) * 1951-02-20 Apparatus for pyrolytic conversion
US2598621A (en) * 1948-04-02 1952-05-27 Taccone Pneumatic Foundry Equi Machine for blowing sand into molds
US2724878A (en) * 1952-06-13 1955-11-29 Emery I Valyi Mold-forming machine
US2692409A (en) * 1952-07-05 1954-10-26 Fed Supply Company Sand blowing apparatus for molds and cores

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856653A (en) * 1955-07-22 1958-10-21 Sutter Products Company Method and apparatus for making hollow shell foundry sand articles
US3023467A (en) * 1960-06-16 1962-03-06 Axel H Peterson Core blowing machines

Also Published As

Publication number Publication date
LU32923A1 (en(2012))
CH322713A (de) 1957-06-30
BE529815A (en(2012))
GB761491A (en) 1956-11-14
FR1102864A (fr) 1955-10-26

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