US3540156A - Machine for cleaning sand castings and recovery of components - Google Patents

Machine for cleaning sand castings and recovery of components Download PDF

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Publication number
US3540156A
US3540156A US690247A US3540156DA US3540156A US 3540156 A US3540156 A US 3540156A US 690247 A US690247 A US 690247A US 3540156D A US3540156D A US 3540156DA US 3540156 A US3540156 A US 3540156A
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United States
Prior art keywords
sand
machine
castings
separator
cleaning
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Expired - Lifetime
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US690247A
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English (en)
Inventor
Hardy W Stebbins
Richard C Kanouse
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Wheelabrator Corp
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Wheelabrator Corp
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Publication of US3540156A publication Critical patent/US3540156A/en
Assigned to WHEELABRATOR CORPORATION, THE reassignment WHEELABRATOR CORPORATION, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SIGNAL APPLIED TECHNOLOGIES INC.
Assigned to SIGNAL APPLIED TECHNOLOGIES INC., A CORP OF DELAWARE reassignment SIGNAL APPLIED TECHNOLOGIES INC., A CORP OF DELAWARE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 03/29/1985DE Assignors: WHEELABRATOR-FRYE INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material

Definitions

  • 51-13 Claims ABSTRACT OF THE DISCLOSURE Unitary apparatus for rough cleaning and finish cleaning work pieces such as foundry sandeastings receives sand casting molds in sequentially introduced loads direct from the molding floor.
  • the sand and debris is continuously conveyed to a separator system in which a first stage removes trash and unwanted debris and a second stage utilizes magnetic separation means to recover shot blasting media while discharging foundry sand externally of the separator.
  • the shot blasting media returns to the conveyor system.
  • the residual sand and spent and reusable blast media are sent by the conveyor to another separator system, the first named system having then been rendered inoperative by operation of a gate which precludes flow of material thereinto.
  • sand and spent blast media are discharged externally by the separator and reusable media flows to the blast machine.
  • This invention relates to a machine for sequentially rough cleaning and finish cleaning work pieces, such as sand castings which may be delivered to a machine directly from the molding floor.
  • the finish cleaning operation is conducted by centrifugal blast means incorporated within the principal machine, said blast means operating to bombard the work pieces with metallic shot or grit or other magnetic metal. It has previously been the practice to effect some degree of precleaning of the castings to prevent overloading of the cleaning apparatus and to insure clean separation of the residual sand from the metallic shot to enable reuse of the shot without sand being present in such amounts as would cause excessive wear of the blast machines and thus shorten the useful life thereof.
  • the mold jackets may be and preferably are removed at the machine whereupon the core material and substantially all of the mold sand passes with the castings into the machine.
  • This meth- 0d of operation offers a substantial improvement, from the standpoint of efficiency, over present foundry practice in which the mold jackets are removed on the molding floor and as much of the molding sand and core material as possible are removed before the castings are introduced into a machine for cleaning.
  • full molds are delivered to the loading equipment for the cleaning machine, as by convenice tional roller conveyors, from which the molds are tipped gravitationally into the loader.
  • mold boards are automatically stripped from the molds by conventional apparatus well known in modern foundry practice. The contents of the molds, including substantially all of the sand, enters the machine.
  • the machine is operated only to tumble the castings,
  • the sand and debris, released from the castings during the free tumbling period, are drained through a foraminous floor and collected for conveyance by means including a by-pass gate to a conventional rotary screen separator whereby substantially all of the trash and non-usable debris is removed from the sand.
  • the sand is then passed directly to a second processing stage which embodies a magnetic drum separator wherein the residual magnetic abrasive or shot is separated from the sand and recycled to the machine.
  • the sand is discharged externally of the separator for transport to the sand supply of the foundry.
  • the machine is activated for blast cleaning as the castings continue to tumble.
  • the aforementioned gate is operated to cut out the first named separators whereby all of the magnetic abrasive and residual sand from the cleaning chamber is displaced to another separator system which removes residual sand and spent abrasive and recovers re-usable abrasive or shot for recycle to the blast machines preferably in the form of centrifugal throwing wheels.
  • a device for continu ously tumbling the castings and for directing blast media onto the castings while being tumbled is marketed by The Wheelabrator Corporation under the trademark Tumblast and is more fully described in US. Pats. No. 2,909,012 and No. 2,918,758. Briefly described, it embodies an enclosure 1 having a movable door 2 for gaining access to the interior of the enclosure.
  • An endless belt 4 in the form of metal slats is guided for movement in one direction about idler rollers and guides to provide a concave pocket adapted to support the castings 3 and when loaded into the device as by means conventional to the trade such that detailed description thereof need not be given.
  • centrifugal throwing wheels 6 are mounted in the upper portion of the enclosure for tthrowing pellets of abrasive downwardly onto the castings 3 as they are being tumbled within the enclosure to enable the centrifugally thrown abrasive particles to gain maximum access to the surfaces and innermost regions of the castings.
  • the spent media and debris passes downwardly through a preliminary screening arrangement, such as a screen 8, into a collecting trough 7 at the bottom of the housing for conveyance rearwardly from the housing by a screw 70.
  • the conveyor is continuously operated by an electrical motor 9 and the spent media and debris is discharged into an elevator 10, which may be of the endless bucket type, having any suitable driving means 11 for operation thereof.
  • the elevator 10 discharges the material into a chamber 12 having an opening 14 in the bottom wall in communication with a chute 20 with a gate member mounted for rocking movement adjacent the opening for operation between open and closed positions.
  • the gate 15 is actuated between open and closed positions by an arm 16 which may be manually operated or operated by an electric motor 17 or air cylinder controlled by any suitable time cycle switch 18 for timed operation of the gate between open and closed positions.
  • separator 24 is of the air wash type illustrated and which is described in fuller detail in US. Pat. No. 3,005,547, while separator 23 may also be of similar construction. Briefly stated, such separators include a scalping screen 25 which separates coarse debris for lateral displacement to a chute 26 while sand or fine refuse discharges through spout 27 which delivers the sand or refuse to the dump or reservoir via a conveyor, not shown.
  • the separator 24 also includes outer flights 40 for spreading the outflowing material across a bafile 41 and then to a discharge chute which delivers usable blast media into hopper 28 which communicates with the inlet to the centrifugal wheel 6 with a manually or automatically operated gate 30 in the passage to control the return of the blast media to the blast machine.
  • the outer flights and baffle 41 are not necessary in the absence of magnetic separation.
  • a preferred form of blast media comprises shot or grit formed of magnetic material such as iron or steel.
  • the separator 23 has a scalping screen 42 which separates large size waste for discharge to the waste discharge 32.
  • the fine material, including spent and reclaimable blast media falls through screen 42 and is spread laterally by outside flights 31 across baffle 43 and then falls onto the magnetic drum separator 33.
  • Non-magnetic material, such as foundry sand, etc. falls from the magnetic drum into chute 34 for disposal to the foundry sand reservoir or the like.
  • the separated magnetic material is delivered to the hopper 35 for passage through the conduit 36 to the conveyor 7 beyond the blast housing.
  • a first load of work which comprises castings and substantially all of the molding sand and core material, is dumped into the tumbler 4, a second load a short time thereafter, such as 6 minutes thereafter, and a third load a corresponding increment after the second, whereby a number of loads are sequentially introduced into the machine with the majority of the sand and debris removed before the subsequent load is introduced thereby to minimize the burden imposed upon the machine while increasing its capacity.
  • the first load of work pieces is shaken out by the tumbler 4.
  • the debris including the foundry sand, core material and gating and the like, which separates from the castings, passes through the screening member 8 into the conveyor 7 for discharge to the elevator 10.
  • the waste is delivered at the top by the elevator 10, falls through the gate 15 and the chute 20 to the conveyor 21 for lateral displacement into the separator 23.
  • the large debris is separated from the fine material by the scalping screen 42 and is discharged to the waste outlet 32 for disposition.
  • the fines pass on to the magnetic separator 33.
  • the separated non-magnetic sand and the like falls into the outlet 34 while the magnetic material is recycled through the chutes 35 and 36 to the conveyor 7.
  • the first load has been roughly cleaned and the machine is prepared for the second load, etc.
  • the fine cleaning period is initiated.
  • the loading door 2 and the gate 15 are displaced to closed positions.
  • the conveyor 22 and the blasting wheels 6 are placed into operation.
  • the gate 30 is open for recycle of the blast media to the blasting machine 6.
  • Conveyor 21 and separator 23 may remain in operation for an additional period of time to purge the units of residual debris.
  • separator 24- removes sand which has escaped separation by the unit 23 and it also operates to separate the coarse debris which may be dislodged from the castings during the finish cleaning operation or otherwise remain from the previous operational cycle.
  • the metallic debris including worn or fractured blast media, is separated from that which is reusable for return to the hopper 28 for recycle to the blast machine.
  • the fine cleaning operation is completed in a short period of time, such as 10 minutes. Following a preferred though not essential short post tumbling period, the machine is shut down for unloading the cleaned work pieces.
  • a cycle may include one or more loads and that the time sequence can be varied quite broadly, depending somewhat upon the volume of materials and the characteristics of the castings, sand and blast media employed. More than one blasting wheel may be employed and use can be made of blast media other than steel shot or grit, although preferably of a separate magnetic material.
  • a machine for rough cleaning sequentially introduced loads of work pieces such as castings contained in foundry molds and then finish cleaning the sequentially introduced work pieces in a continuous operation comprising a chamber for receiving the contents of said foundry molds, means within said chamber to support and tumble said contents, a centrifugal blast machine within said chamber to bombard the tumbling work pieces with blast media, a first conveyor communicating with said chamber to receive therefrom sand and debris from said work pieces during tumbling of said sequentially introduced loads of work pieces, a second conveyor communicating with said first conveyor, a first separator to receive debris directly from said second conveyor to eflect a separation of unwanted trash from said sand and debris, a second separator in direct communication with the first separator to receive the residue therefrom and remove the sand content thereof, a third separator adapted to separate reusable blast media from sand and spent blast media, a third conveyor communicating between said first conveyor and said third separator, valve means for controlling flow from said first conveyor optionally to said first or third separators, and means communicating between said
  • a machine as claimed in claim 1 in which the blast media comprises magnetic metal particles and in which the second separator is a magnetic separator for removal of magnetic metal particles from the remainder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
US690247A 1967-12-13 1967-12-13 Machine for cleaning sand castings and recovery of components Expired - Lifetime US3540156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69024767A 1967-12-13 1967-12-13

Publications (1)

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US3540156A true US3540156A (en) 1970-11-17

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Application Number Title Priority Date Filing Date
US690247A Expired - Lifetime US3540156A (en) 1967-12-13 1967-12-13 Machine for cleaning sand castings and recovery of components

Country Status (7)

Country Link
US (1) US3540156A (enrdf_load_stackoverflow)
AT (1) AT287943B (enrdf_load_stackoverflow)
BE (1) BE725349A (enrdf_load_stackoverflow)
CH (1) CH493308A (enrdf_load_stackoverflow)
FR (1) FR1594360A (enrdf_load_stackoverflow)
GB (1) GB1247914A (enrdf_load_stackoverflow)
SE (1) SE352011B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694964A (en) * 1970-11-13 1972-10-03 Carborundum Co Abrasive blast cleaning system
US3738415A (en) * 1971-12-23 1973-06-12 J Planten Method of molding articles and reclaiming the foundry sand used
US4449331A (en) * 1981-03-17 1984-05-22 Tiglhman Wheelabrator Limited Shot blasting machinery
US5722038A (en) * 1989-09-15 1998-02-24 Mclaughlin; Timothy M. Mold element construction and related method
US6174225B1 (en) * 1997-11-13 2001-01-16 Waste Minimization And Containment Inc. Dry ice pellet surface removal apparatus and method
US20030143929A1 (en) * 2000-05-26 2003-07-31 Schmidt Thomas Tygesen Method and system for cleaning workpieces by wet blasting
US20060063475A1 (en) * 2004-09-17 2006-03-23 Cmv Construcoes Mecanicas Ltda Turbine blasting machine
WO2012117783A1 (ja) * 2011-03-01 2012-09-07 新東工業株式会社 投射材分別装置およびショット処理装置
CN103624694A (zh) * 2013-12-20 2014-03-12 哈尔滨朗格斯特节能科技有限公司 钢管除锈机滤网
US20170259393A1 (en) * 2016-03-11 2017-09-14 Tipton Corp. Surface treatment method for metal parts
CN116237876A (zh) * 2023-02-16 2023-06-09 江苏乐砂智能装备有限公司 一种具备丸砂分离的喷砂机
WO2023138164A1 (zh) * 2022-01-18 2023-07-27 武汉大学 一种高压水射流钢轨打磨铁屑分离系统及方法
CN119427226A (zh) * 2024-12-20 2025-02-14 湖南科技大学 一种难清洁矿石的绿色高效干法清洗方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716947A (en) * 1971-01-21 1973-02-20 Carborundum Co Abrasive blast cleaning system
DE2504059C2 (de) * 1975-01-31 1985-07-11 Lindemann Maschinenfabrik GmbH, 4000 Düsseldorf Zuführfüllschacht
RU2107583C1 (ru) * 1994-06-17 1998-03-27 Акционерное общество "АвтоВАЗ" Способ очистки продуктов дробеметной обработки отливок
RU2278020C1 (ru) * 2004-12-27 2006-06-20 Олег Иванович Гречишкин Устройство для регенерации абразивной среды при абразивно-струйной обработке

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005547A (en) * 1959-11-13 1961-10-24 Bell Intercontinental Corp Separator for particulate materials
US3097450A (en) * 1963-07-16 Rough cleaning and finish cleaning machine and method
US3097451A (en) * 1963-07-16 Blast machine system and method
US3097452A (en) * 1963-07-16 Casting coke knock-out and cleaning
US3103766A (en) * 1961-01-26 1963-09-17 Bell Intercontinental Corp Core cleanup and blast machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3097450A (en) * 1963-07-16 Rough cleaning and finish cleaning machine and method
US3097451A (en) * 1963-07-16 Blast machine system and method
US3097452A (en) * 1963-07-16 Casting coke knock-out and cleaning
US3005547A (en) * 1959-11-13 1961-10-24 Bell Intercontinental Corp Separator for particulate materials
US3103766A (en) * 1961-01-26 1963-09-17 Bell Intercontinental Corp Core cleanup and blast machine

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694964A (en) * 1970-11-13 1972-10-03 Carborundum Co Abrasive blast cleaning system
US3738415A (en) * 1971-12-23 1973-06-12 J Planten Method of molding articles and reclaiming the foundry sand used
US4449331A (en) * 1981-03-17 1984-05-22 Tiglhman Wheelabrator Limited Shot blasting machinery
US5722038A (en) * 1989-09-15 1998-02-24 Mclaughlin; Timothy M. Mold element construction and related method
US6174225B1 (en) * 1997-11-13 2001-01-16 Waste Minimization And Containment Inc. Dry ice pellet surface removal apparatus and method
US20030143929A1 (en) * 2000-05-26 2003-07-31 Schmidt Thomas Tygesen Method and system for cleaning workpieces by wet blasting
US6688946B2 (en) * 2000-05-26 2004-02-10 Thomas Tygesen Schmidt Method and system for cleaning workpieces by wet blasting
US20060063475A1 (en) * 2004-09-17 2006-03-23 Cmv Construcoes Mecanicas Ltda Turbine blasting machine
WO2012117783A1 (ja) * 2011-03-01 2012-09-07 新東工業株式会社 投射材分別装置およびショット処理装置
CN103624694A (zh) * 2013-12-20 2014-03-12 哈尔滨朗格斯特节能科技有限公司 钢管除锈机滤网
US20170259393A1 (en) * 2016-03-11 2017-09-14 Tipton Corp. Surface treatment method for metal parts
US10086490B2 (en) * 2016-03-11 2018-10-02 Tipton Corp. Surface treatment method for metal parts
WO2023138164A1 (zh) * 2022-01-18 2023-07-27 武汉大学 一种高压水射流钢轨打磨铁屑分离系统及方法
CN116237876A (zh) * 2023-02-16 2023-06-09 江苏乐砂智能装备有限公司 一种具备丸砂分离的喷砂机
CN116237876B (zh) * 2023-02-16 2023-12-29 江苏乐砂智能装备有限公司 一种具备丸砂分离的喷砂机
CN119427226A (zh) * 2024-12-20 2025-02-14 湖南科技大学 一种难清洁矿石的绿色高效干法清洗方法

Also Published As

Publication number Publication date
SE352011B (enrdf_load_stackoverflow) 1972-12-18
CH493308A (de) 1970-07-15
BE725349A (enrdf_load_stackoverflow) 1969-05-16
AT287943B (de) 1971-02-10
FR1594360A (enrdf_load_stackoverflow) 1970-06-01
GB1247914A (en) 1971-09-29

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Legal Events

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AS Assignment

Owner name: WHEELABRATOR CORPORATION, THE, INDIANA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SIGNAL APPLIED TECHNOLOGIES INC.;REEL/FRAME:004530/0026

Effective date: 19860115

Owner name: SIGNAL APPLIED TECHNOLOGIES INC., A CORP OF DELAWA

Free format text: MERGER;ASSIGNOR:WHEELABRATOR-FRYE INC.;REEL/FRAME:004530/0016

Effective date: 19850329