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Publication numberUS2823562 A
Publication typeGrant
Publication dateFeb 18, 1958
Filing dateSep 16, 1953
Priority dateSep 16, 1953
Publication numberUS 2823562 A, US 2823562A, US-A-2823562, US2823562 A, US2823562A
InventorsFrank F Humbarger
Original AssigneeUnion Carbide Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of fabricating files and the like
US 2823562 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Feb. 18, 1958 F. F. HUMBARCI-IER METHOD OF FABRICATING FIL ES AND THE LIKE Filed Sept. 16, 1953 INVENTOR FRANK F. HUMBARGER ATTORNE Unitd Statfis Patent Ofiic P atented Feb. 1a, 1958 METHOD OF FABRICATING FILES AND H LIKE Frank F. Humbarger, Indianapolis, Ind., assignor to Union Carbide Corporation, a corporation of New York Application September 16, 1953, Serial No. 380,561

Claims. (CI. 76?24) The present invention relates to a method of producing files and the like having hard-surfaced work surfaces.

Heretofore, files have been made with integral teeth of steel or other relatively low wear resisting materials and as such were greatly subject to wearing at the work surfaces. When such files are worn, resharpening is required if the files are to be used further. There is a considerable difference of opinion as to the value of a resharpened file.

Therefore, it is the main object of the present invention to provide a method of fabricating files which have hard-surfaced teeth or work surfaces and which have a longer use life.

Other aims and advantages will be apparent from the following description and appended claims.

In the drawing:

Fig. l is a schematic view, partly in cross-section, of an embodiment of the invention wherein a file blank is shown being processed to provide a hard-surfaced work surface;

Fig. 2 is a fragmentary view of a cross-section of the hard-surfaced file produced; and

Fig. 3 is an isometric view, greatly magnified, of a portion of a hard-surfaced file produced according to the invention.

In accordance with the process of the present invention, and referring to Fig. l of the drawing, a screen 10 is placedv against the work surface 12 of a file blank 14 of steel or other suitable material. A hard-surface material, such as tungsten carbide, is applied through the screen to the work surface of the file blank in accordance with the flame plating method of copending U. S. application Serial No. 275,332, filed March 7, 1952, by R. H. Poorman et al., and issued on August 2, 1955, as U. S. Patent No. 2,714,563. In that method a comminuted hard-surface material, such as tungsten carbide-cobalt alloy, is suspended in a detonatable mixture which is introduced into an elongated barrel of a detonation gun 16 and ignited. The high velocity detonation wave and expanding hot gaseous combustion products impart energy to the suspended particles 17 which then pass out p the barrel of the gun and are directed against a surface to be coated. Such coatings flame plated with a detonation gun have been found to have extremely low porosity and excellent strength qualities. Coatings varying from 0.0005" to over 0.20" in thickness may be applied depending on the specific application. The flame plated coating deposited in this manner is held to the surface of the base metal by a firm metallurgical bond.

In the depositing of such hard-surface material on the work surface of the file blank through a screen, it is highly desirable to permit the screen to move slightly to prevent the permanent joining, or bonding, of the screen to the file blank.

It has been found that the shape of the file teeth produced is greatly dependent on the angle at which the detonation gun 16 is held relative to the surface of the file blank. As shown in 'Figs. 2 and 3 of the drawing, when the detonation gun 16 is held at an acute angle to the file blank surface 12, the teeth produced are prisms alternately triangular 18 and 'hollowly triangular 20 in vertical cross-section due .to the changing shape of the screen.

When hard-surfaced material is deposited with the detonation gun normal to the Work surface fo the file blank, all the teeth produced are prisms having rectangular bases.

It is to be understood that teeth having shapes between these extremes can be obtained by variation of the angle maintained between the detonation gun and the work surface of the file blank.

Similarly, the diameter and mesh of the screening may be varied to produce a hard-surfaced tooth of the desired height.

Files fabricated in accordance with the present invention, having teeth of tungsten carbide-+12% cobalt alloy, have been extremely resistant to wear and have proven to have a life greatly exceeding that of steel files employed heretofore.

The hard-surface material applied to form film teeth in accordance with present invention may be applied in one pass of the-detonation gun or may be built up in a number of passes. It has been found desirable to build up the teeth with a number of passes where the height of the file teeth to be fabricated exceeds 0.20.

What is claimed is:

l. A method of fabricating a file having hard-surface teeth comprising placing a screen in contact with the work surface of a file blank, applying a deposit of hard-surface material to said work surface of said file blank to form file teeth of hard-surface material on the work surface thereof by detonating a body of gas containing particles of hard-surface material therein and directing the prodnets of said detonation through said screen and against said surface.

2. A method of fabricating files in accordance with claim 1, wherein said screen is moved slightly during the application of said hard-surface material in order to prevent bonding of said screen to said file.

3. A method of fabricating files having hard-surface teeth comprising placing a screen in close proximity with the work surface of a file blank, applying a deposit of hard-surface material to said work surface of said file blank to form file teeth of hard-surface material on the work surface thereof by detonating a body of gas containing particles of hard-surface material therein and directing the products of said detonation through said screen and against said surface.

4. A method of fabricating files in accordance with claim 3, wherein said screen is moved slightly during the application of said hard-surface material in order to prevent bonding of said screen to said file.

5. A method of fabricating files having hard-surface teeth comprising placing a mesh screen in close proximity with the work surface of a file blank; providing, in an elongated barrel having an open end, a detonatable body of a mixture of fuel and oxidizing gas capable of being detonated and a comminuted hard-surface material; igniting said detonatable body of detonatable mixture to produce a detonation and thereby transmit to said comminuted hard-surface material some of the energy of said detonation to eject said comminuted hard-surface material at high temperature and velocity from the open end of said barrel; directing said ejected comminuted hard surface material through said screen and against said work surface of said file blank to form file teeth of hard surface material on the work surface of said file blank.

6. A method of fabricating files in accordance with claim 5, wherein said screen is moved slightly during the application of said hard-surface material in order to prevent bonding of said screen to said file.

7. A method of fabricating files having hard-surface teeth comprising placing a mesh screen in contact with the work surface of a file blank; providing, in an elongated barrel having an open end, a detonatable body of a mixture of fuel and oxidizing gas capable of being detonated and a comminuted hard-surface material; igniting said detonatable body of detonatable mixture to produce a detonation and thereby transmit to said comminuted hard-surface material some of the energy of said detonation to eject said comminuted hard-surface material at high temperature and velocity from the open end of said barrel; directing said ejected comminuted hard-surface material through said screen and against said work surface of said file blank to form file teeth of hard-surface material on the work surface to said file blank.

8. A method of fabricating files in accordance with claim 7, wherein said screen is moved slightly during the application of said hard-surface material in order to prevent bonding of said screen to said file.

9. The method of fabricating a file having hard-surface teeth comprising positioning a screen in contact with a work surface of a file blank; applying a deposit of hardsurface material to said work surface of said file blank by directing an expanding body of hot gaseous combustion products, containing particles of hard-surface material therein, through said screen and against said surface 4 to there form a plurality of individual teeth of homogeneous hard-surface material directly bonded metallurgically to said work surface of said file blank; and removing said screen therefrom.

10. The method of fabricating a file having hard-surface teeth comprising positioning a mesh screen in contact with a work surface of a file blank; applying a deposit of hard-surface material to said work surface of said file blank by directing an expanding body of hot gaseous combustion products, containing particles of hard-surface material therein, at an acute angle to said work surface of said file blank through said mesh screen and against said surface to there form a plurality of individual teeth of homogeneous hard-surface material directly bonded metallurgically to said work surface of said file blank, said teeth being prismatic in shape and generally triangular in one cross-section; and removing said mesh screen therefrom.

References Cited in the file of this patent UNITED STATES PATENTS 1,662,008 Legate Mar. 6, 1928 1,817,311 Hedde Aug. 4, 1931 FOREIGN PATENTS 248,560 Great Britain Mar. 11, 1926 480,157 Great Britain Feb. 17, 1938 588,438 Great Britain May 22, 1947

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1662008 *Apr 23, 1926Mar 6, 1928Edwin E SageProcess of coating metals
US1817311 *Jan 24, 1930Aug 4, 1931Firm La Soc Societe Nouvelle DMethod and means for the obtainment of decorative effects upon textile fabrics by brilliant metallic deposits
GB248560A * Title not available
GB480157A * Title not available
GB588438A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2897692 *Jun 9, 1955Aug 4, 1959Simonds Saw And Steel CompanyProcess for file making
US2984892 *May 26, 1958May 23, 1961Simmonds Aerocessories LtdCutting or abrading tools
US3077024 *Jun 20, 1958Feb 12, 1963Vermont American CorpSheet metal file
US3174363 *Nov 8, 1961Mar 23, 1965Millers Falls CoMethod of forming cutting tools
US5181939 *Dec 20, 1989Jan 26, 1993Charles NeffArticle and a method for producing an article having a high friction surface
US5891204 *May 23, 1997Apr 6, 1999Neff; Charles E.Article and a method for producing an article having a high friction surface
US6083631 *Apr 10, 1997Jul 4, 2000Neff; CharlesArticle and a method and apparatus for producing an article having a high friction surface
US6997790Aug 6, 2003Feb 14, 2006Neff Charles EMethod of fabricating pliant workpieces, tools for performing the method and methods for making those tools
US7347769Feb 10, 2006Mar 25, 2008Neff Charles EMethod of fabricating pliant workpieces, tools for performing the method and methods for making those tools
Classifications
U.S. Classification76/24.1, 51/309, 427/272, 427/427, 51/293
International ClassificationB23D73/00
Cooperative ClassificationB23D73/00
European ClassificationB23D73/00