US3363368A - Method for removing finishing composition entrapped in finished parts - Google Patents

Method for removing finishing composition entrapped in finished parts Download PDF

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Publication number
US3363368A
US3363368A US498973A US49897365A US3363368A US 3363368 A US3363368 A US 3363368A US 498973 A US498973 A US 498973A US 49897365 A US49897365 A US 49897365A US 3363368 A US3363368 A US 3363368A
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US
United States
Prior art keywords
parts
finishing
pellets
finishing composition
chips
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
US498973A
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English (en)
Inventor
Gunther W Balz
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.)
Roto Finish Co Inc
Original Assignee
Roto Finish Co Inc
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
Priority to CH954848D priority Critical patent/CH954848A/xx
Application filed by Roto Finish Co Inc filed Critical Roto Finish Co Inc
Priority to US498973A priority patent/US3363368A/en
Priority to FR80773A priority patent/FR1497124A/fr
Application granted granted Critical
Publication of US3363368A publication Critical patent/US3363368A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls

Definitions

  • the present invention relates to the finishing art and is more particularly concerned with a novel method for removing finishing composition pellets and portions thereof which are entrapped in the cavities of finished parts.
  • Finishing of parts is generally accomplished by tumbling or vibrating the parts in a chamber together with a finishing composition to cause relative motion between the parts and the finishing composition.
  • a finishing composition generally comprises a mixture of relatively large pellets utilized as a bulking agent, together with a more finely divided abrasive material.
  • the composition may comprise relatively large size pellets in which the more finely divided abrasive material has been dispersed, either uniformly or alternatively concentrated at the surface, center, or some other area thereof.
  • Such pellets, or chips as they are commonly termed may be prepared in any of many different forms such as triangles, rings, stars, bars, cylinders, tubes, and various other suitable forms.
  • FIG. 1 is a flow diagram of one embodiment of a process according to the invention.
  • FIG. 2 is a flow diagram of a process constituting a modified embodiment of the invention.
  • FIG. 3 is a side elevation of a typical pellet or chip
  • FIG. 4 is a fragmentary cross-section of a part showing a plurality of chips entrapped in certain cavities thereof.
  • a finishing composition comprising chips or pellets, usually of relatively large size compared to the size of the associated abrasive particles, and an abrasive material.
  • the abrasive material may be provided as separate finely divided or particulate material, in which case the pellets or chips are utilized in the capacity of a bulking agent.
  • the abrasive particles may be dispersed within the chips, either uniformly or concentrated at the surface or center or at another particular portion thereof.
  • a further Patented Jan. 16, 1968 alternative involves the use of abrasive material either free or dispersed in a usual pellet or chip matrix together with the unique bulking material of the invention.
  • a still further alternative involves use of abrasive material partly in a normal or usual pellet or chip matrix and partly in a matrix according to the invention.
  • the material from which the chips are produced is so chosen that it has a lower thermal coefiicient of expansion than that of the parts to be finished. Consequently, as an additional step in the finishing process, as an expedient for removing chips which may have become entrapped within cavities of the part to be finished, the parts containing the entrapped pellets are separated from the loose finishing composition and placed in a heat chamber. As the temperature is elevated, the parts expand to a greater degree than the pellets. The temperature is raised to at least that point at which the diiferential in expansion is sufiicient to release the pellets, and to permit them to be disengaged from the cavities of the parts and to be separated therefrom.
  • FIG. 1 is a flow diagram illustrating one embodiment of the method of the present invention.
  • the parts and finishing composition are first subjected to a finishing process which may involve any one of many such methods and apparatus commonly used, as for example a deburring process in a suitable finishing apparatus 1.
  • a finishing process which may involve any one of many such methods and apparatus commonly used, as for example a deburring process in a suitable finishing apparatus 1.
  • the mixture comprising the parts and finishing composition is removed from the finishing machine and the parts separated from the free finishing composition by means of an apparatus such as a vibrating screen 2.
  • the separated parts which may contain entrapped finishing pellets, are then transferred to a preferably inert liquid bath, such as a water bath 3.
  • the liquid bath 3 is maintained at a temperature sufficiently high to cause the parts to expand to a sufficiently greater extent than the pellets so that the pellets are released, permitting them to be dislodged from the openings or cavities of the parts and to fall to the bottom of the bath, where they may be removed or recovered by suitable means.
  • the parts may contain cavities at their upper surfaces which continue to retain the dislodged chips, they may be subjected to a tumbling operation to permit the contained chips to be removed by means of gravity. Such chips may subsequently be removed by any suitable means such as a vibrating screen.
  • FIG. 2 illustrates another embodiment of the invention which may be utilized where a higher temperature is required to cause the parts to expand sufiiciently to free the pellets.
  • a higher temperature is necessary when, for example, the thermal coefiicient of expansion of the parts is only slightly greater than that of the finishing composition.
  • the parts are separated from the free finishing composition by any suitable means such as a vibrating screen 5.
  • the separated parts, containing entrapped pellets are then conveyed to a heat chamber 6 maintained at a temperature sufliciently high to cause the parts to expand and release the pellets.
  • the mixture comprising the finishing composition and parts is then conveyed over a vibrating screen 7 for removing the dislodged chips.
  • the separated parts where necessary,
  • ' may be transferred to a turnover device 8 for separating chips still remaining in upwardly disposed cavities, and thechips so separated removed over a second vibrating screen 9.
  • FIG. 3 One commonly used type of chip or pellet 10 i illustrated in FIG. 3, and shown imbedded in various cavities of a part in FIG. 4.
  • the part shown in fragmentary cross sectional view comprises a carburetor 11 having openings or cavities 12, 13, and 14, in which are wedged chips 15, 16, and 17.
  • a turnover device 8 Upon entrance of the part into the heat subject the part to a turnover device 8 as shown in FIG. 2.
  • the composition of the finishing material may be one 7 of several types.
  • the pellets themselves do not contain any abrasive material, but are utilized primarily as a bulking agent, applying a force pressing the abrasive material against the surface of the parts.
  • Such pellets may be formed of any commonly used materials such as crushed limestone in any of various shapes and sizes.
  • the abrasive comprises a separate component, generally in finely divided or particulate form.
  • the abrasive material may be dispersed or imbedded within the chips, either uniformly therein or concentrated on the surface or some other portion thereof. In this embodiment the chips perform a dual function, as a bulking agent and as an abrading agent.
  • the material of which the pellets are composed either in toto or as a matrix, must have a lower thermal coefficient of expansion than the parts which are to be finished.
  • the finishing material including chips are placed together with the parts to be finished in a suitable finishing machine.
  • the parts are transported into a heating chamber, either in the form of a liquid bath as shown in FIG. 1, or an air-heating chamber as shown in FIG. 2.
  • Liquid baths may generally be maintained at temperatures of up to 206 F. Where higher temperatures are required, air baths may be utilized and maintained at temperatures of up to 350 F. and even higher.
  • pellets or chips may be made are limestone, ceramic materials, aluminum, zinc, plastics, porcelain, and steel.
  • abrasive materials which may be used in finely divided or particulate form, either as a separate component or imbedded or dispersed in the chips, are emery, Carborundum, diamond dust, and many others known in the art.
  • finishing composition comprises a plurality of pellets and an abrasive material, said pellets being comprised of a material having a thermal coeflicient of expansion which is lower than that of said parts, and
  • said method comprises the further step of heating said parts to a temperature suificient to cause said parts to expand and to release pellets which have become entrapped by said parts during the finishing process.
  • finishing parts which comprises subjecting said parts and a finishing composition to movement causing relative motion between said parts and said finishing composition, and subsequently separating said' parts from said finishing composition
  • said finishing composition comprises a mixture of a plurality of pellets and a more finely divided abrasive material, said pellets being comprised of a material having a thermal coefficient of expansion which is lower than that of said parts
  • said method comprises the further step of heating said parts to a temperature snfiicient to cause said parts to expand and to release pellet which have become entrapped by said parts during the finishing process.
  • finishing composition comprises a plurality of pellets comprising a matrix and abrasive material dispersed therein, said matrix being comprised of a material having a thermal coefiicient of expansion which is lower than that of said parts, and wherein said method comprises the further step of heating said parts to a tempera;
  • trix is comprised of zinc.
  • trix is comprised of plastic.
  • said mawherein said mawherein said matrix is comprised of ceramic.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US498973A 1965-10-20 1965-10-20 Method for removing finishing composition entrapped in finished parts Expired - Lifetime US3363368A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH954848D CH954848A (enrdf_load_html_response) 1965-10-20
US498973A US3363368A (en) 1965-10-20 1965-10-20 Method for removing finishing composition entrapped in finished parts
FR80773A FR1497124A (fr) 1965-10-20 1966-10-20 Composition de finissage et procédé pour l'enlever de pièces finies dans lesquelles elle est retenue

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US49897265A 1965-10-20 1965-10-20
US498973A US3363368A (en) 1965-10-20 1965-10-20 Method for removing finishing composition entrapped in finished parts
FR80773A FR1497124A (fr) 1965-10-20 1966-10-20 Composition de finissage et procédé pour l'enlever de pièces finies dans lesquelles elle est retenue

Publications (1)

Publication Number Publication Date
US3363368A true US3363368A (en) 1968-01-16

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US498973A Expired - Lifetime US3363368A (en) 1965-10-20 1965-10-20 Method for removing finishing composition entrapped in finished parts

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US (1) US3363368A (enrdf_load_html_response)
CH (1) CH954848A (enrdf_load_html_response)
FR (1) FR1497124A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060129798A1 (en) * 2004-11-30 2006-06-15 Allied Generators, Inc. Stand-by power generator monitoring system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476540A (en) * 1948-04-20 1949-07-19 Monroe Auto Equipment Co Method of removing flash from molded articles
US2947124A (en) * 1959-09-08 1960-08-02 Bendix Aviat Corp Process for tumble finishing
US3324605A (en) * 1964-06-09 1967-06-13 Lester Castings Inc Tumble-finishing process and media therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476540A (en) * 1948-04-20 1949-07-19 Monroe Auto Equipment Co Method of removing flash from molded articles
US2947124A (en) * 1959-09-08 1960-08-02 Bendix Aviat Corp Process for tumble finishing
US3324605A (en) * 1964-06-09 1967-06-13 Lester Castings Inc Tumble-finishing process and media therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060129798A1 (en) * 2004-11-30 2006-06-15 Allied Generators, Inc. Stand-by power generator monitoring system

Also Published As

Publication number Publication date
CH954848A (enrdf_load_html_response)
FR1497124A (fr) 1967-10-06

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