| 摘要 |
A device and process of electrolytic precision drilling of a plurality of in-line boreholes formed in a row, the boreholes having skewed axes and serving as cooling air holes in a workpiece includes a plurality of tubular electrodes for passing a stream of electrolyte therethrough, the stream being directed at the workpiece, an electrolyte manifold head, the tubular electrodes being attached thereto, guidance means which have an upper edge and are provided with coaxial guidance bores for each of the bores to be formed in the workpiece for receiving the tubular electrodes respectively, and where the guidance means are rigid with the workpiece, and feed means for the tubular electrodes. The electrodes are dimensioned for a guidance-free length to remain between the attachment point of the tubular electrodes of the electrolyte manifold when the electrodes reach a final bore depth in the workpiece; that length is at least equal to fifty times the diameter of one of the tubular electrodes. The manifold head includes holding means for the tubular electrodes and the holding means includes an elastic material which has a modulus of elasticity not exceeding 500 kp/mm2; the electrolyte manifold head has a direction of feed which coincides with a line bisecting the axes of the outermost boreholes of the row.
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