Metal treatment – Compositions – Heat treating
Patent
1988-02-11
1989-05-02
Kastler, Scott
Metal treatment
Compositions
Heat treating
266 51, B23K 706
Patent
active
048265411
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to methods of deburring of parts, and more specifically, to methods of thermal deburring of metal parts.
2. Description of the Prior Art
Known in the art is a method of thermal deburring of metal parts, wherein the parts being treated are placed in a chamber, the latter is filled with a mixture of a combustible gas and oxygen, the amount of each component in the mixture and its pressure being dependent on the material and dimensions of parts being treated, and the mixture is subsequently ignited (cf. U.S. Pat. No. 3,475,229, class 148-9, published Oct. 28, 1969; USSR Inventor's Certificate No. 615,094, class B23K 28/00, published July 25, 1978).
Using the above method, it is necessary to perform an additional operation to degrease and remove moisture from the surface of the parts being treated prior to placing them in the chamber. This operation has been necessitated by the fact that oils on the surface of parts combined with oxygen are conducive to uncontrollable combustion of the combustible gas and oxygen in the chamber, which interferes with the process of treatment.
Moisture on the surface being treated results in a drastic increase in the energy required to remove the burrs, because part of the energy is spent on evaporation. As to the operation to degrease and dry the surface of parts, it is rather labour-consuming and toxic. Moreover, the operation in question calls for a separate workplace provided with relevant machinery.
SUMMARY OF THE INVENTION
The present invention is aimed at providing a method of thermal deburring of metal parts according to which parts in a chamber are treated in such a way that it is possible to eliminate labour consuming and toxic operations of degreasing and drying surfaces of parts being treated and uncontrollable ignition in the chamber of mixture of a combustible gas and oxygen.
The invention substantially resides in a method of thermal deburring of metal parts, wherein the parts being treated are placed in a chamber, the latter is filled with a mixture of a combustible gas and oxygen, the amount of each component in the mixture and the pressure thereof being dependent on the material and dimensions of parts being treated, and the mixture is ignited according to the invention, which presupposes that prior to being filled with a mixture of a combustible gas and oxygen the chamber is filled with a mixture of a combustible gas and air, the amount of each component and the pressure of the latter mixture being dependent on the necessity to ensure the burning-out of oils and evaporation of moisture from the surface of parts being treated, the mixture is ignited to expel oils and moisture from the surface of parts, and the products of combustion are subsequently removed.
The proposed method of thermal deburring of metal parts allows labour conditions to be improved, the quantity of additional equipment to be reduced, and interference with the parts treatment process to be avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
Further the present invention will become more fully apparent with reference to specific embodiments thereof taken in conjunction with the accompanying drawings, wherein:
FIG. 1 illustrates a chamber for thermal deburring of metal parts to implement a method for thermal deburring of metal parts, according to the invention (longitudinal section); and
FIG. 2 is a diagram of the variations of the pressure in the chamber, depending on the time, and explaining the method, according to the invention with time t in seconds being plotted on the abscissa and pressure P in MPa, o n the ordinate.
DESCRIPTION OF THE BEST MODE FOR CARRYING OUT THE INVENTION
The method of thermal deburring of metal parts, according to the invention, consists in that a part 1 being treated with burrs 2 thereon is placed onto a bottom 3 of a chamber 4. The latter is then filled with a mixture of a combustible gas and air (time interval t.sub.1 in FIG. 2), the amount of each component in the mixture and th
REFERENCES:
patent: Re29408 (1977-09-01), Geen et al.
patent: 1186162 (1916-06-01), Bauer
patent: 3475229 (1969-01-01), Geen et al.
patent: 3608879 (1971-09-01), Birr et al.
patent: 3645521 (1972-02-01), Geen et al.
patent: 3666252 (1972-05-01), Rice
patent: 3901488 (1975-08-01), Riddle
patent: 4394007 (1983-07-01), Leisner
Bozhko Valery P.
Kononenko, deceased Vadim G.
Kushnarenko Sergei G.
Losev Alexei V.
Strizhenko Vitaly E.
Kastler Scott
Kharkovsky Aviatsionny Institut Imeni N.E. Zhukovskogo
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