US2876601A - Coating removing method - Google Patents
Coating removing method Download PDFInfo
- Publication number
- US2876601A US2876601A US587160A US58716056A US2876601A US 2876601 A US2876601 A US 2876601A US 587160 A US587160 A US 587160A US 58716056 A US58716056 A US 58716056A US 2876601 A US2876601 A US 2876601A
- Authority
- US
- United States
- Prior art keywords
- coating
- jet
- gun
- wire
- abrasive
- 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
Links
- 238000000034 method Methods 0.000 title description 18
- 238000000576 coating method Methods 0.000 title description 13
- 239000011248 coating agent Substances 0.000 title description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000004804 winding Methods 0.000 description 9
- 239000008262 pumice Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 210000003298 dental enamel Anatomy 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/12—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof
- H02G1/1285—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for removing insulation or armouring from cables, e.g. from the end thereof by friction, e.g. abrading, grinding, brushing
Definitions
- the process of the invention briefly, comprises directing a fine jet of powdered pumice suspended in water against the surface coating to be removed.
- the capabilities of the cutting jet are increased by reducing the surface tension of the water, and by using a gas under pressure as the means of propulsion.
- a certain amount of the gas is carried along with the cutting stream, and acts to cool the windings during the abrading away of the surface coating.
- the present invention aifords a simple process for removing a coating from the surface of a winding along a desired path without disturbing the turns or leaving an undesired residue as may occur in chemical processes. It is not limited to the initial production stages, but can be utilized even after the winding has been assembled in equipment.
- Fig. 1 is an elevational view of a gun, partly broken away to show details of construction, for directing a cutting jet against a work piece, together with a compressed gas supply tank.
- an air gun of conventional design is shown as directing an abrasive jet stream against a work piece 4.
- the propulsive force is supplied by gas under pressure from a tank 5, delivered to the gun through a flexible conduit 6.
- the application of the jet is controlled by the operator through a valve 7. This valve opens to allow the abrasive mixture, shown at 9, to be forced out of the closed container portion through a fine adjustable nozzle 11 in the form of the cutting jet stream 2 of controllably small diameter.
- Such a gun has a handle 12 which the operator holds during use, conveniently placed for controlling the jet by pressure of hisfinger on the valve 7.
- the container portion 10 is provided to receive a supply of the abrasive mixture 9.
- This mixture consists of a suspension of air-blown or finely divided pumice in chemically pure water. Distilled water is of sufficient purity for this purpose. A small amount of a wetting agent such as that known by the registered trade name Aerosol" is added to the water, and the whole shaken up well before each use. This addition makes it possible to carry the pumice in suspension more effectively by lowering the surface tension of the water.
- a wetting agent such as that known by the registered trade name Aerosol
- the container 10 holds about three ounces of water to which three drops of Aerosol are added, together with from one to two ounces of powdered air-blown pumice.
- the amount of pumice used depends on the type of coating material to be removed from the wire, and its thickness. Two ounces is about the maximum that can be used before the gun will choke and refuse to give a smooth continuous cutting stream.
- the gas tank 5 may be of the standard fifty-pound commercial variety, filled with either CO or N A pressure gauge 14 is provided, and the tank valve 15 is set to deliver about 70 pounds per square inch pressure to the gun 1.
- the operator directs the gun 1 onto the particular portion of the resistance wire from which the insulation is to be removed, and adjusts the controllable nozzle 16 to give the desired width of the cutting jet. He then presses the valve 7, and the mixture will be directed in a controlled-diameter jet stream against the work piece.
- the pressure from tank 5 operates against the surface of the abrasive mixture liquid 9 in the closed container 10, forcing it out the nozzle 16 and against a work piece 4.
- the work piece here shown for example is the potentiometer winding 4, from the edge of which the insulation is to be removed to permit a sliding contact arm to engage electrically therewith to afford a variable resistance circuit element.
- the insulating coating is cutaway by the pumice.
- the spraying continues until the bare metal surface of the wire is exposed to the view of the operator.
- the operation is best performed under a low power binocular microscope in a large enamel metal tray to catch residual solution. Inasmuch as the wires used are from .0004 to .001 inch in diameter, an unskilled worker using a hand method could very easily break the wires on the wound unit in trying to remove the enamel coating.
- the wet pumice process makes it possible for an operator with little previous skill in this type of work to produce a finished unit in minimum time with acceptable quality.
- the removal can either be confined to a special area on the resistor unit by a masking technique or by careful direction of the jet.
- an entire assembly can be thoroughly stripped of its insulation and later the entire unit washed clean with distilled water under pressure with an air gun. After being dried by blowing CO or N on the unit with an air gun, such an assembly is ready for use or installation.
- a method of removing a surface coating from wire material the steps of: supporting said wire material; directing a stream of an abrasive carrying emulsion against said wire material, said emulsion including water, a wetting agent and said abrasive; and pressurizing said emulsion with gaseous nitrogen to produce said stream.
Description
March 10, 19 9 N. F. .MOFADDAN 2,876,601
COATING REMOVING METHOD Filed May 24, 1956 United States Patent t" COATIN G REMOVING METHOD Norman F. McFaddan, Los Angeles, 'Calif., assignor to t HughesAircraft Company, Culver City, Calif., a corporation of Delaware W This invention relates to the removal of surface coatings and particularly to a method and apparatus for forming a contact area on a winding of insulated fine wire.
The process of the invention, briefly, comprises directing a fine jet of powdered pumice suspended in water against the surface coating to be removed. The capabilities of the cutting jet are increased by reducing the surface tension of the water, and by using a gas under pressure as the means of propulsion. A certain amount of the gas is carried along with the cutting stream, and acts to cool the windings during the abrading away of the surface coating.
In manufacturing resistance elements for use in potentiometers and the like, it has been common practice to wind an insulated wire or other resistance element about a form, and subsequently to remove chemically or mechanically a sufficient amount of the insulation to provide a contact path for engagement by a sliding connection member. With large resistance elements this is a comparatively simple matter. As the size of the resistance element is reduced, the difiiculty of removing the coating over a precisely defined area without disturbing the winding or injuring the wire is increased.
Additional problems are found with high precision equipment. One such is the tendency of the common efiicient abrasive materials of the class of Carborundum to remain in the interstices of the windings and form an electrical path between the adjacent turns. Another is the likelihood of an expansion of the wire caused by heat generated during physical removal of the coating, resulting in a loosening of the windings and displacement of the turns on the core.
The present invention aifords a simple process for removing a coating from the surface of a winding along a desired path without disturbing the turns or leaving an undesired residue as may occur in chemical processes. It is not limited to the initial production stages, but can be utilized even after the winding has been assembled in equipment.
The method of the invention may be utilized in connection with the apparatus as illustrated in the accompanying drawing, in which:
Fig. 1 is an elevational view of a gun, partly broken away to show details of construction, for directing a cutting jet against a work piece, together with a compressed gas supply tank.
It will be understood that the method is not limited in its utilization to use with the precise apparatus shown, but is applicable to all equivalent embodiments.
In Figure 1, an air gun of conventional design, generally indicated as 1, is shown as directing an abrasive jet stream against a work piece 4. The propulsive force is supplied by gas under pressure from a tank 5, delivered to the gun through a flexible conduit 6. The application of the jet is controlled by the operator through a valve 7. This valve opens to allow the abrasive mixture, shown at 9, to be forced out of the closed container portion through a fine adjustable nozzle 11 in the form of the cutting jet stream 2 of controllably small diameter.
A gun of the type used by artists in air brush work, which is readily obtainable in commerce, is very satisfactory for use with the method of the invention. Such a gun has a handle 12 which the operator holds during use, conveniently placed for controlling the jet by pressure of hisfinger on the valve 7. The container portion 10 is provided to receive a supply of the abrasive mixture 9.
This mixture consists of a suspension of air-blown or finely divided pumice in chemically pure water. Distilled water is of sufficient purity for this purpose. A small amount of a wetting agent such as that known by the registered trade name Aerosol" is added to the water, and the whole shaken up well before each use. This addition makes it possible to carry the pumice in suspension more effectively by lowering the surface tension of the water.
In a typical embodiment, the container 10 holds about three ounces of water to which three drops of Aerosol are added, together with from one to two ounces of powdered air-blown pumice. The amount of pumice used depends on the type of coating material to be removed from the wire, and its thickness. Two ounces is about the maximum that can be used before the gun will choke and refuse to give a smooth continuous cutting stream.
The gas tank 5 may be of the standard fifty-pound commercial variety, filled with either CO or N A pressure gauge 14 is provided, and the tank valve 15 is set to deliver about 70 pounds per square inch pressure to the gun 1.
The operator directs the gun 1 onto the particular portion of the resistance wire from which the insulation is to be removed, and adjusts the controllable nozzle 16 to give the desired width of the cutting jet. He then presses the valve 7, and the mixture will be directed in a controlled-diameter jet stream against the work piece. The pressure from tank 5 operates against the surface of the abrasive mixture liquid 9 in the closed container 10, forcing it out the nozzle 16 and against a work piece 4. The work piece here shown for example is the potentiometer winding 4, from the edge of which the insulation is to be removed to permit a sliding contact arm to engage electrically therewith to afford a variable resistance circuit element.
As the mixture strikes the insulated surface, which may be enamel, lacquer, or plastic, for example, and the jet is moved slowly along the surface to be cleaned, the insulating coating is cutaway by the pumice. The spraying continues until the bare metal surface of the wire is exposed to the view of the operator. The operation is best performed under a low power binocular microscope in a large enamel metal tray to catch residual solution. Inasmuch as the wires used are from .0004 to .001 inch in diameter, an unskilled worker using a hand method could very easily break the wires on the wound unit in trying to remove the enamel coating.
The wet pumice process makes it possible for an operator with little previous skill in this type of work to produce a finished unit in minimum time with acceptable quality. The removal can either be confined to a special area on the resistor unit by a masking technique or by careful direction of the jet. In some cases, an entire assembly can be thoroughly stripped of its insulation and later the entire unit washed clean with distilled water under pressure with an air gun. After being dried by blowing CO or N on the unit with an air gun, such an assembly is ready for use or installation.
With a work piece such as that illustrated at 4, there is suflicient gas entrained with the jet stream to provide the desired cooling effect. As the abrasive-carrying stream impinges on the work piece, the entrained gas evolves therefrom and in the process cools the work piece, thereby preventing expansion of the windings and possible subsequent dislocation on thesupporting core member.
It will thus be seen that the method of this invention makes it readily possible for even unskilled workers to perform stripping operations on small size equipment to be used in precision circuitry. It will also be apparent that this method of removing enamel, lacquer, or plastic insulation is also suited to the preparation of work pieces for soldering or other permanent attachment purposes requiring a substantially chemically clean surface.
What is claimed as new is:
I, In a method of removing a surface coating from wire material, the steps of: supporting said wire material; directing a stream of an abrasive carrying emulsion against said wire material, said emulsion including water, a wetting agent and said abrasive; and pressurizing said emulsion with gaseous nitrogen to produce said stream.
2. A method of removing a surface coating from wire material in accordance with claim 1 wherein said abrasive comprises powdered air-blown pumice.
3. A method for removing a surface coating from wire material in accordance with claim 2 wherein said water is chemically pure.
References Cited in the file of this patent UNITED STATES PATENTS
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US587160A US2876601A (en) | 1956-05-24 | 1956-05-24 | Coating removing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US587160A US2876601A (en) | 1956-05-24 | 1956-05-24 | Coating removing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2876601A true US2876601A (en) | 1959-03-10 |
Family
ID=24348623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US587160A Expired - Lifetime US2876601A (en) | 1956-05-24 | 1956-05-24 | Coating removing method |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2876601A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3043200A (en) * | 1958-06-20 | 1962-07-10 | Harry J Huttash | Self-propelled concrete joint treating machine and method |
| US3085924A (en) * | 1957-11-19 | 1963-04-16 | Goodyear Tire & Rubber | Method of tire balancing |
| US3103765A (en) * | 1959-09-25 | 1963-09-17 | Owens Illinois Glass Co | Slurry-blasting apparatus |
| US3149445A (en) * | 1959-09-25 | 1964-09-22 | Owens Illinois Glass Co | Surface finishing and treating method |
| US3257759A (en) * | 1963-07-18 | 1966-06-28 | Ajem Lab Inc | Process for surface altering |
| US3364068A (en) * | 1966-11-22 | 1968-01-16 | Stern Gottfried Fred | Process for the cleaning of razor head components |
| US3394504A (en) * | 1964-03-21 | 1968-07-30 | Int Standard Electric Corp | Method for producing an insulating body for dip-solder connections |
| US3626841A (en) * | 1969-07-03 | 1971-12-14 | Zvi Harry Schachter | Abrasive propellent apparatus |
| US4044507A (en) * | 1976-05-12 | 1977-08-30 | Silver Creek Minerals Corporation | Method and apparatus for stripping, cleaning and treating surfaces |
| JPS53123592U (en) * | 1977-03-07 | 1978-10-02 | ||
| US4548001A (en) * | 1980-05-16 | 1985-10-22 | John Link | Cleaning apparatus and method |
| US4678119A (en) * | 1982-10-12 | 1987-07-07 | Buehler Ltd. | Abrasive slurry supply system for use in metallographic sample preparation |
| US5158455A (en) * | 1990-02-09 | 1992-10-27 | Young Dental Manufacturing Company | Control unit for a scaler and a polisher |
| US20080028873A1 (en) * | 2006-08-03 | 2008-02-07 | Yi Zhao Yao | Dispersed spray extraction particulate measurement method |
| US20080070486A1 (en) * | 2006-09-14 | 2008-03-20 | Hitachi Plant Technologies, Ltd. | Blasting device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2005456A (en) * | 1932-06-11 | 1935-06-18 | Rca Corp | Variable resistance device |
| US2462480A (en) * | 1944-01-08 | 1949-02-22 | Arthur H Eppler | Polishing method and apparatus |
| US2462982A (en) * | 1945-05-17 | 1949-03-01 | Frank W Macclean | Cleaning electrical coils |
| US2466890A (en) * | 1945-01-15 | 1949-04-12 | Honeywell Regulator Co | Method of soldering to a nickel alloy coil |
-
1956
- 1956-05-24 US US587160A patent/US2876601A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2005456A (en) * | 1932-06-11 | 1935-06-18 | Rca Corp | Variable resistance device |
| US2462480A (en) * | 1944-01-08 | 1949-02-22 | Arthur H Eppler | Polishing method and apparatus |
| US2466890A (en) * | 1945-01-15 | 1949-04-12 | Honeywell Regulator Co | Method of soldering to a nickel alloy coil |
| US2462982A (en) * | 1945-05-17 | 1949-03-01 | Frank W Macclean | Cleaning electrical coils |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3085924A (en) * | 1957-11-19 | 1963-04-16 | Goodyear Tire & Rubber | Method of tire balancing |
| US3043200A (en) * | 1958-06-20 | 1962-07-10 | Harry J Huttash | Self-propelled concrete joint treating machine and method |
| US3103765A (en) * | 1959-09-25 | 1963-09-17 | Owens Illinois Glass Co | Slurry-blasting apparatus |
| US3149445A (en) * | 1959-09-25 | 1964-09-22 | Owens Illinois Glass Co | Surface finishing and treating method |
| US3257759A (en) * | 1963-07-18 | 1966-06-28 | Ajem Lab Inc | Process for surface altering |
| US3394504A (en) * | 1964-03-21 | 1968-07-30 | Int Standard Electric Corp | Method for producing an insulating body for dip-solder connections |
| US3364068A (en) * | 1966-11-22 | 1968-01-16 | Stern Gottfried Fred | Process for the cleaning of razor head components |
| US3626841A (en) * | 1969-07-03 | 1971-12-14 | Zvi Harry Schachter | Abrasive propellent apparatus |
| US4044507A (en) * | 1976-05-12 | 1977-08-30 | Silver Creek Minerals Corporation | Method and apparatus for stripping, cleaning and treating surfaces |
| JPS53123592U (en) * | 1977-03-07 | 1978-10-02 | ||
| US4548001A (en) * | 1980-05-16 | 1985-10-22 | John Link | Cleaning apparatus and method |
| US4678119A (en) * | 1982-10-12 | 1987-07-07 | Buehler Ltd. | Abrasive slurry supply system for use in metallographic sample preparation |
| US5158455A (en) * | 1990-02-09 | 1992-10-27 | Young Dental Manufacturing Company | Control unit for a scaler and a polisher |
| US20080028873A1 (en) * | 2006-08-03 | 2008-02-07 | Yi Zhao Yao | Dispersed spray extraction particulate measurement method |
| US20080070486A1 (en) * | 2006-09-14 | 2008-03-20 | Hitachi Plant Technologies, Ltd. | Blasting device |
| US7591709B2 (en) * | 2006-09-14 | 2009-09-22 | Hitachi Plant Technologies, Ltd. | Blasting device |
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