Electric heating – Metal heating – Cutting or disintegrating
Patent
1989-09-26
1991-05-28
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
204224M, 219 6914, 219 6916, B23H 730
Patent
active
050196839
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to electroerosive machining of metals, and more particularly to an apparatus for electroerosive piercing of holes in workpieces.
2. Description of the Related Art
There is known an apparatus for electroerosive piercing of holes in workpices (cf., PCT/SU 87/00099, filed Sept. 17, 1987). This prior art apparatus comprises an electrode holder with an electrode tool in the form of a rod placed with a clearance in a shell and projecting therefrom, and a means for moving, locking and wear-compensation of the electrode tool. This means includes parallel operatively interconnected driving and driven carriages each having a clamp for successively rigidly locking the rod of the electrode tool fashioned as movable and stationary jaws, the casing of each such carriage having through centering holes at the level of a clearance between the movable and stationary jaws, these holes being arranged coaxially with a passage provided in a pipe butt affixed to the lower part of the electrode holder. This passage receives, for axial displacements therein, the rod of the electrode tool the shell of which is rigidly secured to the pipe butt of the electrode holder coaxially with the rod, the electrode holder being fixedly attached to the driving carriage. The electrode holder can be hollow inside, and the interior of the electrode holder should preferably communicate with the passage receiving the rod of the electrode tool providing for the feed of a working fluid through the clearance between the shell and the rod of the electrode tool to the machining zone.
In the course of electroerosive machining, the driving carriage with the shell of the electrode tool secured thereon can move relative to the rod of the electrode tool mounted on the driven carriage in a direction opposite to the feed of the electrode tool to thereby compensate for part of the rod of the electrode tool being consumed during the electroerosive process.
However, this construction of the electroerosive apparatus including a feed drive, and driving and driven carriages carrying an electrode tool can find application only in stationary units, and therefore fails to pierce holes in large-size workpieces and in difficultly accessible locations.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an apparatus for piercing of holes in workpieces, in which a means for reciprocating a shell relative to a rod of an electrode tool would be so constructed as to enable piercing deep holes in large-size workpieces and difficultly accessible locations, as well as to ensure a higher accuracy and surface finish of holes, and more efficient operation of the apparatus.
The aims of the invention are attained by an apparatus for electroerosive piercing of holes in workpieces comprising an electrode tool in the form of a rod placed with a clearance in a shell to project therefrom, and a means for feeding and rotating the rod, which according to the invention, is provided with a means for reciprocating the shell relative to the rod mechanically connected to the means for feeding and rotating the rod and having the form of a hydraulic cylinder having cavities, and a piston which has the shell secured thereto at the side of the workpiece, and at least one of the cavities of the hydraulic cylinder is connected to a line for feeding and discharging a working fluid, the piston having at least one passage which communicates with the interior of the shell of the electrode tool and through which the rod of the electrode tool extends with a clearance.
In order to monitor the movement of the shell in the course of electroerosive piercing, it is desirable that at least one magnetic element of a ferromagnetic material be accommodated at the piston of the hydraulic cylinder, the outer surface of the hydraulic cylinder being provided at the level of the magnetic element with an indicator ring of a magnetizable material capable of reciprocations.
Such an arrangement of the
REFERENCES:
patent: 3271283 (1966-09-01), Clifford et al.
patent: 3318793 (1967-05-01), Webb
patent: 3668105 (1972-06-01), Abt
patent: 4543460 (1985-09-01), Inoue
"Metallorezhuschie stanki" edited by V. K. Tepinkichiev, c.f. p. 287, Fig. 240, 12/1973.
Abdukarimov Erkin T.
Vakhidov Khaidar A.
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