SU884925A1 - Apparatus for electrochemical broaching of holes - Google Patents

Description

(54) DEVICE FOR ELECTROCHIMTIC SEWING HOLES

The image is related to the size-execrochemical processing, in particular to the piercing of the through holes of the pipe, by a frequent electrode tool. A device for piercing apertures with a tubular electrode tool with holding a trepanned core on a current-carrying base is known, in which a cavity is made to provide the required electrode overrun, ai holding the core, using a permanent magnet mounted on a sliding fit in the cavity LI 3 The disadvantages of the known device include the complication of the design by the introduction of a permanent magnet, the instability of its characteristics in the magnetic field of the technological current, the limitation nomenclature of the processed materials of ferromagnetics and the possibility of etching the uninsulated base. The purpose of the invention is to expand the range of processed materials and increase the durability of the device. The goal is achieved t & l, that at the base at the location of the trepan core, core holes are connected to the atmosphere and the cavity at the base is a closed groove covering the base section under the trepan core, and covered with insulating material, Fig. 1 schematically shows the proposed device a general view, a section; in fig. 2 - section A-A on fng.1. The device consists of a current supply for the brush: base 1, with a circular cavity O, covered with a collar with a thick coating 2, and holes t) 1 located under the trepanned core 3 on the hotplate area C and connected to the atmosphere of a tubular electrode 4 with internal supply of the e-wave for ultra-chemical flashing of part 5,

The device works in the following way.

Part 5 is fixed on base 1 by a known clamping device. The technological current is supplied to the part 5 through the base 1. During the machining of the hole, after separating the trepan core 3 from part 5, it is pressed by the force of electrolyte overpressure in the electrode-tool 4 to the conductive area C. Due to the strength of the friction core 3 is kept., From the shift in the transverse direction, thereby eliminating the possibility of short circuits,. As the core GOK is constantly supplied to core 3 through platform C, its electrochemical dissolution occurs and core 3 does not prevent the electrode from running over- of the tool 4, and the electrolyte freely flows into the interelectrode gap. Thus, the metal is removed from the part and, consequently, the hole is dimensionally stable. At the same time, base I is protected from etching - by an insulating coating 2.

The depth of the cavity Q in the base I is 1-1.5 mm. more than the minimum required overrun Sngp, which is the sum of the width of the non-insulated electrode on the electrode tool 4, the distance of the dissipation currents, the size of the end gap. With coating in passive electrolights, the overshoot is 1.5-2, О mm. Thus, the depth of the cavity Q is 2, 5 mm. Dimensions of the reference conductive pad

C under the trepan core 3 is most accurately determined by a partially cross-welded sample. To do this, the sample is electrochemically processed to a depth sufficient to form a complete core profile (core), a sample is cut and the core thickness is measured at a height equal to the required overrun of the tool electrode. Per This value doubles the thickness of the insulation coating 2. The bore diameters {s and their number is chosen to be maximal in order to ensure sufficient force of pressing the core 3, leaving the walls of sufficient strength.

the invention

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A device for electrochemically piercing holes with a tubular electrode tool with holding a trepanned core on a current-carrying base, in which a cavity is made to provide the required overrun of the tool electrode, characterized in that holes are made, connected to the atmosphere, and the cavity in the basement. is a closed groove, covering the base section under the burr core, and covered with insulating material.

Sources of information, take into account the examination of I, USSR Author's Certificate No. 448925, cl. B 23 .P 1 / O4, 1973.

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Claims (1)

Claim 20 Device for electrochemical flashing of holes with a tubular electrode-tool with holding trephined core on a current-supply base in which a cavity is made 25 to ensure the required overrun of the electrode-tool) characterized in that, in order to expand the range of processed materials, in the base at the location 30 trephined core holes are made, connected to the atmosphere, and the cavity in the base is a closed groove covering the portion of the base under the trephined core, and is covered with insulating Material.