EP0140511A1 - Method and apparatus for removing excess material from sand cores - Google Patents
Method and apparatus for removing excess material from sand cores Download PDFInfo
- Publication number
- EP0140511A1 EP0140511A1 EP84305627A EP84305627A EP0140511A1 EP 0140511 A1 EP0140511 A1 EP 0140511A1 EP 84305627 A EP84305627 A EP 84305627A EP 84305627 A EP84305627 A EP 84305627A EP 0140511 A1 EP0140511 A1 EP 0140511A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- particles
- cores
- stream
- conduit
- impact
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/18—Finishing
Definitions
- This invention relates generally to the art of finishing and cleaning molded articles by directing particulate material against the rough molded article. Impeller systems for directing metal shot against cast metal articles for cleaning the articles is well known.
- the present invention relates more specifically to the finish cleaning of molded sand cores which are made by molding a mixture of sand and a binder, to form a core that may be of complex shape having holes, projections, notches, and other irregularly shaped areas.
- Such articles are far more delicate than the articles which have heretofore been finished by blasting with an impact media, often metal particles moving at high velocities. Accordingly, prior art blasting apparatus and methods have not been adaptable to the problem of automated cleaning of molded sand cores, and the present rubbing by hand methods for cleaning cores are unacceptable because they are time consuming and expensive.
- the present invention provides an apparatus and method in which relatively soft impact particles are showered against the cores in a relatively gentle manner so as to remove flash and other excess material without damaging the cores.
- the apparatus consists of a conveyor on which the relatively light-weight sand cores are supported so that the opposite sides of the cores can be reached by streams of impact particles.
- a plurality of nozzles are positioned both above and below the conveyor and relatively low pressure air is directed through the nozzles in the direction of the sand cores on the conveyors. Large volumes of relatively soft impact particles without any sharp points or edges, such as small pieces of plastic, are entrained in the air so that they will be directed against the sand cores.
- the flash and other excess material is relatively loosely adhered or attached to the main body of the core and as a result, when these loosely adhered pieces are impacted by the moving particles, they are dislodged from the main body of the core. However, when these relatively soft slow moving particles engage the sand core, the particles do not damage or disrupt the surface of the main body of the core.
- the apparatus can be operated continuously to automatically clean and finish a large number of sand cores in a short time.
- the method and apparatus of this invention is advantageous in that it provides for the rapid and thorough cleaning of complex parts by subjecting these parts to showers of particles moving against the parts from different directions so as to finish both internal and external surfaces in the part.
- the apparatus of this invention is shown in Figs. 1 and 2 as including a main frame 12 on which is mounted a housing 14 and a conveyor assembly 16 which is operable to move aand cores to be cleaned through the housing 14.
- a plurality of nozzles 18 are mounted in the housing l4•at positions above the conveyor assembly 16 and a plurality of the same nozzles 18 mounted below the conveyor 16.
- the nozzles 18 are supplied with air by a blower or turbine 20 and a particalized media 22 is fed to the nozzles 18 from a supply hopper 24 located above the nozzles 18.
- An elevator assembly 26, of conventional type, operates to transfer used particles 22 from the bottom of the apparatus and deliver these particles to the hopper 24 for re-use.
- the conveyor assembly 16 is illustrated as including a plurality of endless strands 28 (Fig. 1), similar to ropes or cables, trained about pulley or sheave assemblies 30, 31 and 32 mounted on the main frame 12.
- the pully assembly 30 includes a shaft 34 which is driven by a motor drive assembly 36 so as to move the strands 28 that extend horizontally between the pulley assemblies 30 and 31 from left to right in Fig. 1.
- a plurality of sand cores to be finished, indicated diagrammatically at 38 in Fig. 2, are laid on the horizontal strands 28 and are moved by the strands into the housing 14 to positions between the upwardly and downwardly directed nozzles assemblies 18.
- each of the nozzles 18 consists of a nozzle head 42 rotatably mounted on an injector body 44 which is connected to a conduit 46 through which air is supplied from the blower 20 and a conduit 48 through which the particles 22 are supplied.
- An inclined septum 47 directs the particles in conduit 48 toward the air stream emanating from conduit 46 at the lower edge 49 of the septum 47. Since the air stream in conduit 46 is created by the blower 20, in contrast to a compressor, it is at a low pressure, namely, below 2 psi. As a result, the stream entrains large volumes of the particles 22 falling off the edge 49 in the form of a curtain. This forms a low pressure stream issuing from nozzle head 42 that contains a dense accumulation of particles 22 directed toward sand cores to be cleaned. It is to be understood that the nozzle head 42 can be remote from the injector body 44 and be connected thereto by a suitable passage.
- the result is a relatively soft flow of particles 22 from each nozzle head 42 that provides for a shower of the particles 22 on both the top and bottom sides of the cores 38 supported on the strands 28 in the housing 14.
- a variety of different relatively soft particles 22 that do not have sharp edges or corners, such as walnut shells, corn. cobs and similar non-ferrous media, can be used in apparatus 10. Particles that are as hard as conventional steel shot used for blast cleaning are too hard and cause erosion of a sand core. However, particles 22 formed of plastic and generally cylindrical in shape and processed so as to have rounded edges, as illustrated in Fig. 6, are preferred from the standpoints of effectivness, cost, cleanliness and lack of surface erosion on the core.
- the particles 22 are preferably formed of an easily obtained plastic, such as polyethylene or polypropylene, and are relatively small in size, having a diameter of about 0.07 inches and a length of about 0.10 inches or less.
- a rough molded sand core 38 is shown in Fig. 4.
- the core is of a relatively complex shape having notches 50, openings 52, projections 54, and other irregularly shaped surfaces on which excess material, a mixture of sand and the binder, adhere as indicated at 56.
- These excess adhering portions 56 are sometimes referred to as "flash" and must be removed from the main body 58 of the sand core 38 in order to make the core 38 useable for its intended purpose in a molding process.
- the cores 38 are placed on the conveyor 16 as shown in Fig. 2 so that they travel on the conveyor 16 through the enclosure 14 and are subjected to the fluidized media 22 that is directed from both above and below onto the surfaces of the sand core 38.
- the open construction of the conveyor 16 enables thorough showering of the core 38 from both above and below. After the sand cores 38 emerge from : the housing 14, they are readily useable in molding operations.
- the method and apparatus of this invention provides for the relatively gentle application of soft impact particles against the somewhat vulnerable body 58 of the sand core 38 so as to provide for the complete removal of all of the excess materials 56 on the body 58 without danger of damage to the body 58.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
- This invention relates generally to the art of finishing and cleaning molded articles by directing particulate material against the rough molded article. Impeller systems for directing metal shot against cast metal articles for cleaning the articles is well known.
- The present invention relates more specifically to the finish cleaning of molded sand cores which are made by molding a mixture of sand and a binder, to form a core that may be of complex shape having holes, projections, notches, and other irregularly shaped areas. Such articles are far more delicate than the articles which have heretofore been finished by blasting with an impact media, often metal particles moving at high velocities. Accordingly, prior art blasting apparatus and methods have not been adaptable to the problem of automated cleaning of molded sand cores, and the present rubbing by hand methods for cleaning cores are unacceptable because they are time consuming and expensive.
- It is an object of the present invention, therefore, to provide an improved method and apparatus for removing flash and other excess material from said cores by directing a fluidized media of impact particles against the sand cores.
- The present invention provides an apparatus and method in which relatively soft impact particles are showered against the cores in a relatively gentle manner so as to remove flash and other excess material without damaging the cores. The apparatus consists of a conveyor on which the relatively light-weight sand cores are supported so that the opposite sides of the cores can be reached by streams of impact particles. A plurality of nozzles are positioned both above and below the conveyor and relatively low pressure air is directed through the nozzles in the direction of the sand cores on the conveyors. Large volumes of relatively soft impact particles without any sharp points or edges, such as small pieces of plastic, are entrained in the air so that they will be directed against the sand cores. The flash and other excess material is relatively loosely adhered or attached to the main body of the core and as a result, when these loosely adhered pieces are impacted by the moving particles, they are dislodged from the main body of the core. However, when these relatively soft slow moving particles engage the sand core, the particles do not damage or disrupt the surface of the main body of the core.
- Accordingly, when the sand cores that are on the moving conveyor are exposed to the action of the fluidized impact media for a relatively short time, the flash and other excess material is quickly removed from the cores. As a result, the apparatus can be operated continuously to automatically clean and finish a large number of sand cores in a short time.
- The method and apparatus of this invention is advantageous in that it provides for the rapid and thorough cleaning of complex parts by subjecting these parts to showers of particles moving against the parts from different directions so as to finish both internal and external surfaces in the part.
- Further objects, features and advantages of this invention will become apparent from a consideration of the following description and the appended claims, when taken in connection with the accompanying drawings in which:
- Fig. 1 is an end view of the core de-finning apparatus of this invention;
- Fig. 2 is a reduced side elevational view of the apparatus of this invention, with some parts broken away for the purpose of clarity;
- Fig. 3 is a sectional view of one of the nozzles in the apparatus of this invention;
- Fig. 4 is a fragmentary top view of a sand core prior to cleaning;
- Fig. 5 is a top view of the sand core shown in Fig. 4, after cleaning;, and
- Fig. 6 is a perspective view of an impact particle useable in the method and apparatus of this invention.
- With reference to the drawing, the apparatus of this invention, indicated generally at 10, is shown in Figs. 1 and 2 as including a main frame 12 on which is mounted a
housing 14 and aconveyor assembly 16 which is operable to move aand cores to be cleaned through thehousing 14. A plurality ofnozzles 18 are mounted in the housing l4•at positions above theconveyor assembly 16 and a plurality of thesame nozzles 18 mounted below theconveyor 16. Thenozzles 18 are supplied with air by a blower orturbine 20 and aparticalized media 22 is fed to thenozzles 18 from asupply hopper 24 located above thenozzles 18. Anelevator assembly 26, of conventional type, operates to transfer usedparticles 22 from the bottom of the apparatus and deliver these particles to thehopper 24 for re-use. - The
conveyor assembly 16 is illustrated as including a plurality of endless strands 28 (Fig. 1), similar to ropes or cables, trained about pulley orsheave assemblies pully assembly 30 includes ashaft 34 which is driven by amotor drive assembly 36 so as to move thestrands 28 that extend horizontally between thepulley assemblies horizontal strands 28 and are moved by the strands into thehousing 14 to positions between the upwardly and downwardly directed nozzles assemblies 18. During movement of thecores 38 into and out of thehousing 14, they move through rubber curtains 40 which tend to confine theparticles 22 from thenozzles 18 to thehousing 14. - As shown in Fig. 3, each of the
nozzles 18 consists of anozzle head 42 rotatably mounted on aninjector body 44 which is connected to aconduit 46 through which air is supplied from theblower 20 and aconduit 48 through which theparticles 22 are supplied. - An
inclined septum 47 directs the particles inconduit 48 toward the air stream emanating fromconduit 46 at thelower edge 49 of theseptum 47. Since the air stream inconduit 46 is created by theblower 20, in contrast to a compressor, it is at a low pressure, namely, below 2 psi. As a result, the stream entrains large volumes of theparticles 22 falling off theedge 49 in the form of a curtain. This forms a low pressure stream issuing fromnozzle head 42 that contains a dense accumulation ofparticles 22 directed toward sand cores to be cleaned. It is to be understood that thenozzle head 42 can be remote from theinjector body 44 and be connected thereto by a suitable passage. - The result is a relatively soft flow of
particles 22 from eachnozzle head 42 that provides for a shower of theparticles 22 on both the top and bottom sides of thecores 38 supported on thestrands 28 in thehousing 14. A variety of different relativelysoft particles 22 that do not have sharp edges or corners, such as walnut shells, corn. cobs and similar non-ferrous media, can be used in apparatus 10. Particles that are as hard as conventional steel shot used for blast cleaning are too hard and cause erosion of a sand core. However,particles 22 formed of plastic and generally cylindrical in shape and processed so as to have rounded edges, as illustrated in Fig. 6, are preferred from the standpoints of effectivness, cost, cleanliness and lack of surface erosion on the core. - The
particles 22 are preferably formed of an easily obtained plastic, such as polyethylene or polypropylene, and are relatively small in size, having a diameter of about 0.07 inches and a length of about 0.10 inches or less. - A rough molded
sand core 38 is shown in Fig. 4. The core is of a relatively complexshape having notches 50,openings 52,projections 54, and other irregularly shaped surfaces on which excess material, a mixture of sand and the binder, adhere as indicated at 56. These excess adheringportions 56 are sometimes referred to as "flash" and must be removed from the main body 58 of thesand core 38 in order to make thecore 38 useable for its intended purpose in a molding process. - As shown in Fig. 5, when the
core 38 has been subjected to the action of the apparatus 10, all of theexcess material 56 has been removed so that thecore 38 can now be used without further processing. In the operation of the apparatus 10, thecores 38 are placed on theconveyor 16 as shown in Fig. 2 so that they travel on theconveyor 16 through theenclosure 14 and are subjected to the fluidizedmedia 22 that is directed from both above and below onto the surfaces of thesand core 38. The open construction of theconveyor 16 enables thorough showering of thecore 38 from both above and below. After thesand cores 38 emerge from : thehousing 14, they are readily useable in molding operations. - From the above description, it is seen that the method and apparatus of this invention provides for the relatively gentle application of soft impact particles against the somewhat vulnerable body 58 of the
sand core 38 so as to provide for the complete removal of all of theexcess materials 56 on the body 58 without danger of damage to the body 58.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US52926083A | 1983-09-06 | 1983-09-06 | |
US529260 | 1983-09-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0140511A1 true EP0140511A1 (en) | 1985-05-08 |
EP0140511B1 EP0140511B1 (en) | 1987-11-04 |
Family
ID=24109161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840305627 Expired EP0140511B1 (en) | 1983-09-06 | 1984-08-17 | Method and apparatus for removing excess material from sand cores |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0140511B1 (en) |
JP (1) | JPS6072638A (en) |
AU (1) | AU574382B2 (en) |
CA (1) | CA1214916A (en) |
DE (1) | DE3467105D1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019051521A1 (en) * | 2017-09-18 | 2019-03-21 | Fill Gesellschaft M.B.H. | Method for deburring casting cores and casting moulds |
US20190170202A1 (en) * | 2016-08-10 | 2019-06-06 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Brake Carrier |
WO2021062456A1 (en) * | 2019-10-03 | 2021-04-08 | Fill Gesellschaft M.B.H. | Surface treatment method |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6533020B2 (en) * | 2001-06-11 | 2003-03-18 | General Motors Corporation | Casting of engine blocks |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2929120A (en) * | 1957-12-04 | 1960-03-22 | Gen Motors Corp | Method of definning sand cores |
EP0086321A1 (en) * | 1982-01-18 | 1983-08-24 | Carl Kurt Walther GmbH & Co. KG | Method of deflashing cores produced by a grained material |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49108692A (en) * | 1973-02-19 | 1974-10-16 | ||
JPS5630057A (en) * | 1979-08-15 | 1981-03-26 | Mazda Motor Corp | Deburring method for core |
JPS58205646A (en) * | 1982-05-24 | 1983-11-30 | Sintokogio Ltd | Removing method of core fins |
-
1984
- 1984-08-17 DE DE8484305627T patent/DE3467105D1/en not_active Expired
- 1984-08-17 CA CA000461283A patent/CA1214916A/en not_active Expired
- 1984-08-17 EP EP19840305627 patent/EP0140511B1/en not_active Expired
- 1984-08-31 AU AU32632/84A patent/AU574382B2/en not_active Ceased
- 1984-09-04 JP JP18526884A patent/JPS6072638A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2929120A (en) * | 1957-12-04 | 1960-03-22 | Gen Motors Corp | Method of definning sand cores |
EP0086321A1 (en) * | 1982-01-18 | 1983-08-24 | Carl Kurt Walther GmbH & Co. KG | Method of deflashing cores produced by a grained material |
Non-Patent Citations (1)
Title |
---|
MODERN CASTING, vol. 73, no. 12, December 1983, page 46, Des Plaines, Illinois, US; "Core finisher" "machine eliminates core fins" * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190170202A1 (en) * | 2016-08-10 | 2019-06-06 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Brake Carrier |
US10837508B2 (en) * | 2016-08-10 | 2020-11-17 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Brake carrier |
WO2019051521A1 (en) * | 2017-09-18 | 2019-03-21 | Fill Gesellschaft M.B.H. | Method for deburring casting cores and casting moulds |
WO2021062456A1 (en) * | 2019-10-03 | 2021-04-08 | Fill Gesellschaft M.B.H. | Surface treatment method |
Also Published As
Publication number | Publication date |
---|---|
AU574382B2 (en) | 1988-07-07 |
JPS6072638A (en) | 1985-04-24 |
EP0140511B1 (en) | 1987-11-04 |
AU3263284A (en) | 1985-03-14 |
DE3467105D1 (en) | 1987-12-10 |
CA1214916A (en) | 1986-12-09 |
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