SU973277A1 - Tool electrode for electrochemical piercing of openings - Google Patents

Description

(54) ELECTRODE INSTRUMENT FOR ELECTROCHEMICAL SEAL OF HOLES

one

This invention relates to dimensional electrochemical machining, and in particular to the machining of holes.

A known electrode is a tool for piercing holes 1.

However, when using a known electrode-tool for electrochemical flashing of deep holes between. the electrode tool and the hole walls form a narrow side gap even with a minimum thickness of the insulation coating of the electrode walls, which leads to an increase in hydrodynamic resistance, electrolyte flow, and ultimately to a decrease in the performance of the process, so as to ensure normal. By carrying out the flashing process without short circuits, it is necessary to reduce the flashing speed.

The aim of the invention is to improve the performance of piercing holes.

The goal is achieved by the fact that the first and last non-isolated areas on 6oKOBoii of the surface of the electrode-tool are made in accordance with the ratios

1MI-.2-10;

12-100, d

Where - is the distance of the first non-isolated section from the working end; 1} - distance of the last non-solubility

bathing area from the working end, d is the diameter of the tubular electrode tool.

FIG. 1 shows an electrode instrument, a general view; in fig. 2 is a section A-A in FIG. one.

The electrode tool comprises a tubular cathode 1 with alternating insulated sections 2 and non-isolated working sections 3 on a side surface. The tubular to-atom 1 has an end face 4.

The first isolated section 3 is located from the working end 4 in accordance with

± J ratio - 2-10, and the last

Viiivctx 12-100. .

Flashing holes is as follows .;

The electrode-tool set the translational movement or combined with the translational movement of the rotation around the axis. The electrolyte is pumped through the internal diameter of the tubular cathode 1 and the process current is switched on.

The electrode tool, with its working end 4 with part 5, forms the initial end gap CG and the initial side gap cf, at which a hydraulic back pressure to the bored electrolyte is created at a height of - (2-10) d necessary for a steady flow of the electrochemical process.

In this case, the flatness of washing in the zone of the end part is provided; 4 electric tools.

As the working highlander 4 of the electrode tool deepens into part 5, the current non-isolated working areas 3 begin to work, which increase the interelectrode side gap from cG to cf, from L to dV, etc. to rfj, the gap cG (2. correspond to the height of the uninsulated sections 3 from the working end 4, and the gap O corresponds to the maximum height li upsi (12-100) d of the positions of the sections 3 from the working end 4

Formed lateral gaps in the CC (, c (, rfV - (fyi due to increased ishrins (for example, (0.15, diL 0.5 mm, etc.)) drastically reduce the hydrodynamic resistance of the electrolyte leaving the end treatment area and eliminate lateral friction the surface of the insulated coating in the area of the side gaps d, (of the insulated sections 2 on the surface of the hole D of the part 5.

The reduction of the lateral hydrodynamic resistance ensures the unhindered evacuation of the products of anodic dissolution and the gases produced as a result of electrical treatment.

With an increase in the height h of the uninsulated portions 3, the more bpuk the speed of the piercing does not increase, moreover, the surface roughness increases.

With a decrease in the height h of the location of the sections 3 from the end 4, the electrochemical process is less stable (short circuits occur).

Thus, the proposed electric tool provides a reduction in lateral hydrodynamic resistance by increasing the lateral interelectrode gap, which, in turn, creates an unobstructed evacuation of anodic dissolution products and increases electrical conductivity.

in the end and side treatment zones, which ultimately allows an increase in the rate of production.

The lack of friction of the side surface of the insulating coating of the electrode-tool located in the area of the side gaps against the wall of the hole prevents damage to the specified hole, and with it, damage to the tool electrode and the surface of the hole.

The use of the proposed electrode tool makes it possible to increase the speed of the firmware up to 2 times as compared with the previous type, as well as to pierce the holes up to 1000 mm in depth.

Claims (1)

Invention Formula Electrode-tool for electrochemical piercing of holes drilled with a working end and with alternating isolated and non-isolated work areas on the side surface, characterized in that, in order to improve the performance of the hole-drilling process, the first and last non-isolated areas on the side surface of the tool electrode are filled according to ratios Jijnav 1Shy s2-10;  12-100, and where il / | jj, - paqcto of the first non-isolated section from the working end; tOX distance of the last uninsulated area from the working end; d - diameter of the tubular electrotool. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 456701, cl. B 23 P 1/12, 1975.