US2882565A - Core making machine - Google Patents

Core making machine Download PDF

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Publication number
US2882565A
US2882565A US455571A US45557154A US2882565A US 2882565 A US2882565 A US 2882565A US 455571 A US455571 A US 455571A US 45557154 A US45557154 A US 45557154A US 2882565 A US2882565 A US 2882565A
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US
United States
Prior art keywords
container
core
air
sand
cylinder
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
US455571A
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English (en)
Inventor
Selby Claude Leslie
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.)
CONSTRUCTIONAL ENGINEERING Co Ltd
CONSTRUCTIONAL ENGINEERING COM
Original Assignee
CONSTRUCTIONAL ENGINEERING COM
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 CONSTRUCTIONAL ENGINEERING COM filed Critical CONSTRUCTIONAL ENGINEERING COM
Application granted granted Critical
Publication of US2882565A publication Critical patent/US2882565A/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding

Definitions

  • This invention relates to core making or core blowing machines of the kind in which the divided material of which the cores are to be made, usually sand mixed with a binder, is fed into a container or magazine into which compressed air is admitted to blow or force the sand through apertures in the base plate of the container and into corresponding apertures in the core box leading to the cavity or cavities in which the core or cores is or are to be formed. It is such machines which are referred to in this specification as of the kind set forth.
  • Core blowing machines are known in which a cartridge is used to be charged with sand and fitted into the machine. Compressed air applied to one end of the cartridge blows the sand out of the other end into the core box. This method is only suitable for lightly bonded core material and the cartridge has to be removed from the machine forre-charging. Medium or heavily bonded core sands tend to become impacted at the core blowing apertures owing to the ramming effect of the air pressure behind it.
  • air isadmitted throughperforations from an air belt surrounding the lower part of the container or magazine and through an additional entry in the upper part of the container so arranged that the sand or other core material is agitated by the entering air and becomes intimatelymixed with it.
  • sand is-usedin this specification forconvenience and is intended to refer not only to sand but to other core materials.
  • the air entry near the upper part of the container is preferably tangential in a cylindrical or conical container so that a swirling motion of the air, and sand entrained with it, takes place inside the container or magazine.
  • the agitation of the sand by this means is so effective that mechanical agitation or stirring is unnecessary.
  • the air preferably also enters the lower wind belt tangentially for more even distribution of pressure around the periphery of the container or magazine.
  • the present invention from another aspect provides a core making or blowing machine of the kind set forth wherein the container is not normally under pressure but is adapted for the momen- 2,882,565 Patented.
  • Apr zl 1959 tary admission of compressed air through entry means so directed that the entering air disturbs the sand within the container from its normally quiescent state, agitates it and mixes it intimately with air, the rise in pressure within the container resulting from said pulse of air forcing sand throughthe base plate into the core box.
  • Figure l is a front. elevation of a core-making or blowing machine according to-the-invention.
  • Figure 2 is a side elevation.
  • Figure 3 is a sectional side elevation on line 3-3 of Figure 1.
  • Figures 4 and 5 are sectional plan views on lines i-.-4 and 5-5 respectively of Figure 3.
  • Figure 6 is a fragmentary sectional view on line 6- -6 of Figure 5.
  • the sand container or magazine is a cylinder 7 with its axis vertical and slidably supported for limited vertical movement by bearings 8 on upright guide pillars9.
  • the pillars 9 are mounted at their lowerend on a base :10 and support above the cylinder a hopper 11 on to which sand for charging'the cylinder can be loaded.
  • a horizontally slidable trap or door 12 normally closes an opening 13 in the bottom of the hopper 11 through which sand can be passed into the open upper end 14 r of the cylinder 7.
  • a platform 15 for a core box is slidably mounted on the pillars 9 below the-cylinder. Its height is adjustable by a screw jack 16 of substantial proportions.
  • the nut 17 of the screw jack- is-provided with a hand wheel 18
  • lateral clamping means 21 may be requiredinaddition.
  • the cylinder is provided with a double wall providing a hollow annular compartment 25 to which air can be admitted through an inlet port 29 arranged substantially tangentiaily to the inner surface of the wall of the cylinder 7.
  • the inner skin 26 of the double wall is provided with a row of internally countersunk holes 27 covered externally by gauze or finely perforated material 28 through which air can pass in fine jets or streams to be intimately mixed with the sand.
  • One or more core blowing apertures 34 is provided in the lower end face of the cylinder to correspond in number and size with the openings in the core boxes to be blown.
  • sand is loaded on to the hopper 11 while the machine is in the unclamped position.
  • the slidable trap or door 12 is opened to allow sand to be moved into the interior of the cylinder.
  • a core box is placed on the platform 15 which is appropriately adjusted for height and then clamped sealing the top and bottom openings of the container. Compressed air is admitted to the cylinder momentarily by the valve 33 to fill'the core box.
  • the machine is unclamped, the core box removed, opened and the core taken out, the core box replaced and the operation repeated as often as necessary.
  • any air remaining under pressure in the cylinder 7 is discharged by the release of the rubber ring seal 22 at the top opening 14 of the cylinder.
  • This embodiment according to the present invention is simple to construct and not costly. It enables cores to be blown of a size within the total capacity of the container in a very short time, which in the case of a machine having a container capacity of twelve pounds and operating on a compressed air line pressure of ninety pounds per square inch is of the order of one second. It is especially suitable for small cores of which a large number may be very rapidly blown at each filling of the cylinder.
  • Cores can be made of any material normally used for core blowing, including medium bonded core sand, synthetic mixtures and shell mould mixtures.
  • a conical hopper may be employed in place of the construction shown in Figures 1 to 3.
  • a cam-ended lever pivoted eccentrically at the back of the fixed part of the clamp 21 with the cam passing through a slot so that its periphery bears upon the clamping face 21a, the single lever swinging in a plane perpendicular to the plane containing the clamping face 21a.
  • the clamps may be operated by compressed air.
  • Compressed air may also be employed for raising the core box platform 15.
  • a bat-lie disc raised above the blowing aperture 34 by projections on its under side as shown at 35 may be employed, to prevent dry material running out of the machine but permits material under pressure to pass around its peripheral edge to the aperture 34.
  • a cylindrical sand container In a core-making machine the combination of a cylindrical sand container, means for supporting a core box below the container, an aperture sand delivery plate at the base of the container, means for supplying air under pressure to the container for forcing sand through said aperture plate into the core box, entry means for admitting such air under pressure at the lowest part of the cylindrical wall of the container for permeating with air a body of sand within the container and additional entry means for simultaneously admitting air to the upper part of the container the interior of which it enters in a direction substantially along the adjacent interior surface of the container, a base, spaced upright columns mounted'on said base, a sand hopper supported by said columns above the container having an opening for the passage of sand in register with an aperture in the top of the container, a movable trap slidably mounted on said hopper and closing said opening, sealing means on said container for the joint around said aperture and between said trap and the top of the container, guide means slidably supporting said container on said columns for limited
  • a core-making machine wherein the means for clamping the container axially is constituted by the means for supporting the core box below the container, and said supporting means has a movable portion slidably mounted on said columns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US455571A 1953-09-18 1954-09-13 Core making machine Expired - Lifetime US2882565A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25797/53A GB797585A (en) 1953-09-18 1953-09-18 Improved core making machine

Publications (1)

Publication Number Publication Date
US2882565A true US2882565A (en) 1959-04-21

Family

ID=10233474

Family Applications (1)

Application Number Title Priority Date Filing Date
US455571A Expired - Lifetime US2882565A (en) 1953-09-18 1954-09-13 Core making machine

Country Status (4)

Country Link
US (1) US2882565A (en。)
BE (1) BE531906A (en。)
FR (1) FR1108216A (en。)
GB (1) GB797585A (en。)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159596B (de) * 1959-05-16 1963-12-19 Kabel Vogel & Schemmann Ag Pneumatische Kern- und Formherstellungsmaschine
US3589431A (en) * 1969-01-09 1971-06-29 Harrison E Fellows Mold making equipment utilizing vertical mold blowing and plural rammers
US4026345A (en) * 1974-06-26 1977-05-31 Wallwork C M G Foundry moulding
US4791974A (en) * 1987-05-18 1988-12-20 Dansk Industri Syndikat A/S Method and an apparatus for producing shaped bodies from particulate material
US4807690A (en) * 1986-08-12 1989-02-28 Erana Agustin Arana Shooting device for core blowing machines
CN107377893A (zh) * 2017-09-09 2017-11-24 泽州县金秋铸造有限责任公司 一种制芯装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135569A (en) * 1977-07-13 1979-01-23 Acme-Cleveland Corporation Molding machine clean out
US4570694A (en) * 1982-01-25 1986-02-18 Lund Robert S Mold-blowing apparatus
DE4109382A1 (de) * 1991-03-21 1992-09-24 Gisag Ag Giesserei Masch Einschiesseinrichtung fuer formmaschinen, insbesondere kernschiessmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH154245A (de) * 1931-05-18 1932-04-30 Fischer Ag Georg Verfahren zum Einbringen von Sand in Formen.
DE557503C (de) * 1931-02-08 1932-08-24 Masch U Werkzeugfabrik Kabel Verfahren und Formmaschine zum Fuellen von Form- und Kernkaesten mit Formsand durch Druckluft
DE579844C (de) * 1931-11-25 1933-07-03 Zimmermann Gustav Sandblaseformmaschine
US2538770A (en) * 1948-11-01 1951-01-23 Thomas N Fea Core box filling machine
US2598621A (en) * 1948-04-02 1952-05-27 Taccone Pneumatic Foundry Equi Machine for blowing sand into molds
US2654924A (en) * 1949-01-06 1953-10-13 Wood David Howard Closure device for feed chambers for finely divided materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE557503C (de) * 1931-02-08 1932-08-24 Masch U Werkzeugfabrik Kabel Verfahren und Formmaschine zum Fuellen von Form- und Kernkaesten mit Formsand durch Druckluft
CH154245A (de) * 1931-05-18 1932-04-30 Fischer Ag Georg Verfahren zum Einbringen von Sand in Formen.
DE579844C (de) * 1931-11-25 1933-07-03 Zimmermann Gustav Sandblaseformmaschine
US2598621A (en) * 1948-04-02 1952-05-27 Taccone Pneumatic Foundry Equi Machine for blowing sand into molds
US2538770A (en) * 1948-11-01 1951-01-23 Thomas N Fea Core box filling machine
US2654924A (en) * 1949-01-06 1953-10-13 Wood David Howard Closure device for feed chambers for finely divided materials

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159596B (de) * 1959-05-16 1963-12-19 Kabel Vogel & Schemmann Ag Pneumatische Kern- und Formherstellungsmaschine
US3589431A (en) * 1969-01-09 1971-06-29 Harrison E Fellows Mold making equipment utilizing vertical mold blowing and plural rammers
US4026345A (en) * 1974-06-26 1977-05-31 Wallwork C M G Foundry moulding
US4807690A (en) * 1986-08-12 1989-02-28 Erana Agustin Arana Shooting device for core blowing machines
US4791974A (en) * 1987-05-18 1988-12-20 Dansk Industri Syndikat A/S Method and an apparatus for producing shaped bodies from particulate material
CN107377893A (zh) * 2017-09-09 2017-11-24 泽州县金秋铸造有限责任公司 一种制芯装置

Also Published As

Publication number Publication date
FR1108216A (fr) 1956-01-10
BE531906A (en。)
GB797585A (en) 1958-07-02

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