A sealed system process for the elimination (destruction or removal) of superfluous projections, such as unwanted burrs and sharp edges, on shaped or fabricated articles of manufacture, particularly those produced by mechanical shaping or fabricating, by treatment with transient elevated gaseous temperatures in a sealed and confined space. The transient elevated gaseous temperatures in the sealed and confined space are produced, for instance, by the ignition or other suitable reaction initiation of various compositions which are exothermic in the sealed and confined space, by the rapid and substantially adiabatic compression of a gas in the sealed and confined space or by some other manner such as by the rapid movement of a heated gas wave under pressure through the sealed and confined space, such as exists in a shock wave, so that the transient elevated gaseous temperatures are produced. The transient elevated gaseous temperatures that eliminate the superfluous projections usually have a duration of less than one second and the process is essentially self-limiting and selective in the removal of the superfluous projections. Various means of aiding the elimination of the superfluous projections are also described.
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1. The process for the elimination of superfluous thin cross-section surface projections including unwanted burrs and, flashings, surface irregularities or sharp edges on an article of manufacture with a much thicker cross-section, the projections superfluities being produced as the result of shaping or fabricating which forms the article of manufacture, which comprises:
(a) providing a sealed and confined space surrounding the superfluous surface projections superfluities to be eliminated on the article of manufacture such that there are open spaces within the sealed and confined space surrounding the superfluous projections superfluities to be eliminated; and (b) generating a transient thermal energy release in a gaseous medium within the sealed and confined open space thereby producing transient elevated gaseous temperatures in the open spaces within the sealed and confined space, sufficient thermal energy being generated to thermally eliminate the superfluous projections superfluities without damage to the article of manufacture and without material alteration of the dimensions and configuration of the article of manufacture.
10. The process for the elimination of superfluous thin cross-section surface projections including unwanted burrs and, flashings, surface irregularities or sharp portions of edges resulting from the mechanical shaping of a relatively much thicker cross-section article of manufacture which comprises:
(a) providing the mechanically shaped article of manufacture with superfluous projections superfluities composed of a material and with a structure such that it resists damage when exposed to transient elevated gaseous temperatures and pressures sufficient to eliminate the superfluous projections superfluities and any damageable essential parts of the structure being protected from such transient elevated gaseous temperatures and pressures; (b) introducing the article with the superfluous projections superfluities into a sealed and confined space defined by walls capable of withstanding the transient elevated gaseous temperatures and pressures sufficient to eliminate the superfluous projections superfluities so that there are open spaces within the sealed and confined space surrounding the superfluous projections; superfluities; (c) generating a transient thermal energy release in a gaseous medium within the sealed and confined open space thereby producing transient elevated gaseous temperatures and pressures in the sealed and confined space, sufficient thermal energy being generated to thermally eliminate the superfluous projections superfluities without damage to the article of manufacture and without material alteration of the dimensions and configuration of the article of manufacture; and (d) removing the article of manufacture, with the superfluous projections superfluities eliminated, from the sealed and confined space.
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initiation in the composition. 13. The process of claim 10 wherein the mechanically shaped article of manufacture with the superfluous projections also has needed surfaces which are protected by masking to prevent damage by the transient elevated temperatures and pressures. 14. The process of claim 10 wherein the transient elevated gaseous temperatures and pressures are produced by the ignition of a combustible gaseous mixture of an oxidizer gas and an oxidizable gas in the sealed and confined space and wherein there is a molar excess of the oxidizer gas over the requirements for reaction with the oxidizable gas sufficient to oxidize the superfluous projections on the article of manufacture. 15. The process of claim 14 wherein in addition the surfaces of the article of manufacture are subsequently cleaned. 16. The process of claim 14 wherein the oxidizer gas is oxygen. 17. The process of claim 10 wherein the transient elevated gaseous temperatures and pressures are produced by the substantially adiabatic compression of a gas in the sealed and confined space. 18. The process of claim 17 wherein the gas is an inert gas. 19. The process of claim 17 wherein the gas is an oxidizer gas. 20. The process of claim 17 wherein the gas is an oxidizable gas. 21. The process of claim 17 wherein the gas is an oxidizer gas. 22. The process of claim 21 wherein the oxidizer gas is oxygen. 23. A process for removal of superfluous projections including unwanted burrs and , flashings, surface irregularities or sharp edges extending from an article of manufacture and wherein the superfluous projections superfluities are the consequence of forming, fabricating, shaping or machining, which comprises: extending the superfluous projection superfluities into a sealed and confined open space and generating a transient thermal energy release in a gaseous medium within the sealed and confined open space thereby producing transient elevated gaseous temperatures in the open spaces within the sealed and confined space, sufficient thermal energy being generated to thermally eliminate the superfluous projection superfluities without material alteration of the dimensions and configuration of the article of manufacture. 24. The process for effecting localized dimensional changes by the removal of superfluous thin cross-section portions of the surfaces of burrs, flashings, surface irregularities or sharp edges on an article of manufacture without substantially affecting the established base dimensions and configuration of the article which comprises: (a) providing the surfaces portions of the article of manufacture requiring the localized dimensional changes by the removal of the thin cross-section portions thereon superfluities in a sealed and confined space such that there are open spaces surrounding the thin cross-section portions; superfluities; and (b) generating a transient thermal energy release in a gaseous medium within the sealed and confined open space thereby producing transient elevated gaseous temperatures in the open spaces within the sealed and confined space, sufficient thermal energy being generated to thermally effect the localized dimensional changes by the removal of the thin cross-section portions on the surfaces superfluities within the sealed and confined space without substantially affecting the established base dimensions and configuration of the article. |
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This application is normallysteel, cain can have essentially any shape. It is preferred that the piston means used in the apparatus of the present invention have a circular cross-section; however, other piston cross-section shapes can be used with good result.
FIG. 10 illustrates the use of an externally developed force F for providing a transient elevated temperature adiabatically. The part 51, having superfluous projections is positioned in a sealed and confined space 52 within the cylinder 53 and one wall comprises a floating piston 54. Active or inert gases are introduced to the sealed and confined space through the port 55 through the wall of the cylinder 53 by means of conduit 56 selectively opened and closed by valve 57. Externally applied force F moves the free piston 54 toward the part 51 thereby accomplishing adiabatic compression of the gas which produces transient high temperatures. This removes the superfluous projections on the part 51. Stop ring 58 assures against overrun of the piston 54 thereby avoiding damage to part 51. A tool holding and closing plate 59 is provided to secure the part 51 and a securing seal is accomplished as by a sliding wedge block 60.
FIG. 11 shows an extension of the structure shown in FIG. 10 wherein the force F is accomplished by application of explosive pressures to the free piston 54 by combustion of an oxidizable gas and an oxidizer gas inserted separately into the combustion chamber 61 from ports 62 and 63 via conduits 64 and 65, respectively, selectively opened and closed by valves 66 and 67, respectively. The fuel mixture is ignited by the spark or glow plug 68. It will be appreciated that in the FIGS. 10 and 11 the force F is not directly applied to the part 51. Rather, an adiabatic compression causes the desired transient thermal energy.
FIG. 12 is another modified form of structure for subjecting the part 71 positioned and located in the sealed and confined space 72 to elevated transient temperatures in accord with the present invention, but wherein an autoignition or autogenetic initiation of combustion is adiabatically accomplished by external elevation of gas pressure to the ignition point of the fuel mixture inserted in the chamber 72 as through ports 73 and 74 via fuel conduits 75 and 76, respectively, and as selectively controlled by valves 77 and 78, respectively. Pre-ignition pressure is applied to the fuel mixture by applying force F' to the piston 79 forcing it toward the part 71 in the cylinder 80 formed by the walls defining the sealed and confined space 72. Ignition occurs at a point in the piston 79 motion when the adiabatically induced temperature rise in the fuel mixture reaches the autoignition temperature of the specific fuel mixture used. The stop ring 81 prevents overrun of the piston 79 thereby avoiding accidental damage to the part 71.
The following is an example showing the use of adiabatic compression of a gas to deburr an identical part as shown in Example I.
Using the apparatus shown in FIG. 10, a polycarbonate piston 54 was provided in a steel cylinder 53. An oxygen atmosphere at 15 p.s.i. absolute was provided in the sealed and confined space 52 along with part 51. The piston 54 was driven by suddenly applying a gas pressure of 1100 p.s.i. to the piston 54 to compress the oxygen in the sealed and confined space 52 to 600 p.s.i. absolute. The compression ratio was about 40 to 1. It was found that the part 51 was effectively deburred.
It is intended that the foregoing description be only illustrative of the present invention and that the present invention be limited only by the hereinafter appended claims.
Rice, Edwin E., Geen, Henry C.
| Patent | Priority | Assignee | Title |
| 4394007, | Sep 27 1979 | ROBERT BOSCH GMBH, POSTFACH 50 7 STUTTGART 1, GERMANY A LIMITED LIABILITY COMPANY OF GERMANY | Deburring chamber for thermal deburring |
| 4819917, | Jun 20 1986 | SPETSIALNOE KONSTRUKTORSKOE BJURO GIDROIMPULSNOI TECHNIKI SIBIRSKOGO OTDELENIYA AKADEMII NAUK SSSR, USSR, NOVOSIBKRSK | Apparatus for deburring workpieces by gas detonation |
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Sep 25 1975 | Chemotronics International, Inc. | (assignment on the face of the patent) | / |
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