SU963788A1 - Tool-electrode for electromechanical machining of printed circuits - Google Patents

Description

The invention relates to the field of electrophysical and electrochemical methods of machining parts and can be used in the manufacture of printed circuits.

A known electrode is a tool for the electrochemical machining of printed circuits containing an electrically conductive base of a trough-shaped form, in the bottom of which screens are cut {s) (elements that are separated 6t each other by through-holes for pumping electrolyte and interconnected by bridges, and the form of screening elements mirrors the shape of the conductors of the printed circuit,., and their working surface is covered with dielectric material.

The disadvantages of the known construction are the low rigidity of the electric tool, since the shielding elements are weighted with thinnest straps, which results especially for large board sizes to reduce the accuracy of printed circuit production, as well as unsatisfactory electrolyte exchange conditions in the working area during processing.

The aim of the invention is to improve the accuracy of manufacturing printed

circuits by increasing the rigidity of the electrode tool and improving the conditions for changing the electrolyte in the interelectrode gap.

The goal is achieved by the fact that the electrode cavity is divided fixed perpendicular to the bottom and to the plane of the shielding elements by longitudinal walls

10 channels in which plungers .I are installed with the possibility of reciprocating movement from a drive

FIG. 1 shows an electrode-in15 structure for Electrochemical processing of printed circuits; FIG. 2, section A-A of FIG. 1 in FIG. 3 - section bb FIG. one.

Claims (2)

The electrode tool for electrical, 20 chemical processing of printed circuits constructively consists of a base 1, made of conductive, corrosion-resistant material, on which partitions 2 are installed with shielding elements 3 mirrored with the conductors of the printed circuit, on which dielectric elastic is applied. (. for example, from silicone). Ek30. the injuring elements 3 are interconnected by interlacing 5, which are also mounted on partitions 2. Between re-corners 2, channels b are formed through which electrolyte is pumped during processing of printed circuits. In channels 6, plungers 7 are installed, connected by rods 8 with a drive 9. Hydraulic, pneumatic, electromechanical and other types of known drives can be used as a drive. During processing of printed circuits, the electrode tool is pressed against the foil of the printed circuit board being processed and installed in a bath with electrolyte. The plungers 7 are moved back and forth in the channels: when entering into the channels b, the electrolyte is withdrawn from the working area, and at the end, a new portion of the electrolyte is sucked out of the bath. The electrode, besides the main function of the instrument for electrochemical processing of printed circuits, to which the negative pole of the technological source is applied, performs the function of a pump that is required for processing printed circuits. To improve the electrolyte pumping conditions, the shielding elements 3 and jumpers 5 should be installed on stiffening ribs with an optimal gap Vi from the working plane 10 of the electrode to the ends of the 11 stiffening ribs, commensurate with the thickness of the elastic coating. The optimal gap And should be understood as the condition under which a sufficient amount of electrolyte gets into the processing zone for intensive processing of printed circuits with sufficient rigidity of the electrode. Similar solutions for the design of the electrode can be applied to cylindrical electrodes. The manufactured pump electrode is pressed against the foil surface, but at the same time the deflection over the entire working surface of the electrode is prevented, since the partitions 2, on which the shielding elements 3 and the shields 5 rest, prevent this. Electrochemical processing of printed circuits brings the positive pole to the board foil. source of technological current, and to the electrode-pump - negative. The design of the electrode tool has been tested in practical terms. In this case, the accuracy of fabrication of printed circuit conductors was not lower than 0.1 mm. The invention Electrode-tool for electrochemical processing of printed circuits, made in the form of a trough-shaped electrically conductive base, at the bottom of which are separated from each other by through holes for pumping electrolyte and screened elements connected with each other by bridges, the shape of which mirrors the shape of printed conductors circuits, and the work surface is covered with dielectric material, characterized in that, in order to increase the accuracy of the manufacture of printed circuits by increasing the strength of the electrode-tool and the improvement of the conditions for changing the electrolyte in the interelectrode gap, the electrode cavity is divided fixed perpendicular to the bottom and to the plane of the shielding elements by longitudinal channels: the electrode is equipped with plungers that are installed with the possibility of air transfer to longitudinal channels. Sources of information taken into account in the examination 1. USSR Author's Certificate for 2974536/08, cl. B 23 P 1/12, 1980. 6 (pi / g f