US43658A - Improved mode of hardening and repairing files and rasps - Google Patents

Improved mode of hardening and repairing files and rasps Download PDF

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US43658A
US43658A US43658DA US43658A US 43658 A US43658 A US 43658A US 43658D A US43658D A US 43658DA US 43658 A US43658 A US 43658A
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rasps
files
hardening
improved mode
repairing
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00Etching metallic material by chemical means
    • C23F1/06Sharpening files

Definitions

  • the process above described has for its object repairing or recutting worn-out files and rasps and rendering them again fit for use, and hardening new files and rasps.
  • the immersion lasts from about ten seconds to about five minutes, according to the more or less worn state of the file or rasp, theirsize,and,above all,theirfinenessorcoarsene'ss and hardness of metal, the sharpening or repairing being much more rapid for a fine soft-grained file than for a large-cut hardgrained file, which may require even a longer immersion than that above named.
  • the solution loses itsstrength by combining with the iron fresh doses'of acid must be added to it in the proportions above indicated.
  • the rasps or files are next washed in clean water, passed through lime-water, dried in stoves or by other means, impregnated with a mixture of oil and turpentine by'means of a brush, and lastly brushed with coke-dust.
  • a Files and rasps may by the above means he sharpened several times and give each time a result at least equal, and in many instances superior, to new tiles and rasps.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Earth Drilling (AREA)

Description

UNITED STATES PATENT OFFICE.
GHARLES ADOLPHE'CITAVEL, OF PARIS, FRANCE.
lMPliOVED MODE 0F HARDENINQ ANDREPAIRING FILES AND RASPS.
Specification forming part of Letters Patent No. 43,658, dated July 26, 1864.
have invented a new and Improved Mode ofv Repairing Worn-Out Files and Rasps and ot' Hardening New Ones; and I dohereby declare that the followingis a full and exact description thereof.
The process above described has for its object repairing or recutting worn-out files and rasps and rendering them again fit for use, and hardening new files and rasps.
It consists, after having removed from their surface any foreign adherent matters, in int mersing the files and rasps in a bath formed of a mixture of sulphuric and nitric acids and water, the most efficacious proportions of which mixture are one part of nitric acid to three parts of sulphuric acid and seven parts of water, by measure. The only operation for new files and rasps is an immersion for a few seconds inthis mixture and the washings and neutralization of the effects of the acid,as will be hereinafter described. For the worn-out files andrasps the immersion lasts from about ten seconds to about five minutes, according to the more or less worn state of the file or rasp, theirsize,and,above all,theirfinenessorcoarsene'ss and hardness of metal, the sharpening or repairing being much more rapid for a fine soft-grained file than for a large-cut hardgrained file, which may require even a longer immersion than that above named. As the solution loses itsstrength by combining with the iron fresh doses'of acid must be added to it in the proportions above indicated. The rasps or files are next washed in clean water, passed through lime-water, dried in stoves or by other means, impregnated with a mixture of oil and turpentine by'means of a brush, and lastly brushed with coke-dust.
When it is necessary, to protect from the 20- tion of the acids certain parts of the file or rasp which are more worn away or lower than the rest amixture ,of sealing-wax and-fat-oil melted together is applied to these parts at a temperature of 30 centigrade, (63.6 Fahrenheit-,) or a varnish of gum-lac or other substance capable of'resisting the action of the acids. The immersion of the files or rasps in the acid bath should only takeplace thirty or forty hours after this application. When, on the contrary,'it is wished to cut away and level certain parts of the file'or rasp which project a mixture of a hundred parts of nitric acid with-fifty parts of sulphuric acid should be applied as many times as it may be necessary, while raising the tool at one end and inclining it toward the side, so that the acids may run into the grooves and deepen them without blunting the teeth. a Files and rasps may by the above means he sharpened several times and give each time a result at least equal, and in many instances superior, to new tiles and rasps.
hardening the surfaces of new files and-rasps,
substantially as above described.
CHARLES ADOLPHE OLAVEL.
Witnesses:
H. BONNEVILLE, 0. AUSTIER.
US43658D Improved mode of hardening and repairing files and rasps Expired - Lifetime US43658A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045321A (en) * 1955-04-15 1962-07-24 Buckbee Mears Co Abrading devices and method of making them

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045321A (en) * 1955-04-15 1962-07-24 Buckbee Mears Co Abrading devices and method of making them

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