A method of and apparatus for radiussing the edge or edges of a metallic aerofoil blade by electrolytic machining wherein the electrolyte is flowed towards the edge to be machined from a hollow electrode.

Method of and apparatus for radiussing an edge or edges of a metallic aerofoil blade

In a method of mirror-finishing a cylindrical workpiece, according to which, with an abrasive matter and an electrolyte disposed at and supplied to each of the gaps between a cylindrical workpiece connected to the anode of a power supply and working electrodes connected to the cathode of the power supply and disposed oppositely to the outer surface or the inner surface of said cylindrical workpiece, an anodic liquation operation by electrolysis performed onto metal in the surface to be treated of the cylindrical workpiece is assisted with an abrasive operation by which anodic passive films generated on the surface to be treated are mechanically abrased by the abrasive matters, whereby the projected portions of the surface to be treated are electrolytically liquated and abrased preferentially, said method is characterized in that an electrolyte in a passive state is used, an electrolytic voltage to be used is in the range from a few volts to about 15 V, the density of an electrolytic current to be used is about 10 A/cm 2 or less, the abrasive matter has a water-permeable property, the pressing force of the abrasive matters to the surface to be treated is 05 kgf/cm 2 or more, the abrasive speed of the abrasive matters is 2 m/s or more, and the cycle which a portion of the surface to be treated is faced to the working electrodes is in the range from 20 to 200 ms According to the method of the present invention, the outer surface or the inner surface of a cylindrical workpiece may readily, easily and efficiently be mirror-finished so as to have surface roughness of about 01 μmRmax or less with the roundness of a cylindrical workpiece being a few μm There is also provided a mirror-finishing apparatus capable of performing a continuous long-term mirror-finishing with improved working efficiency, by abrasive matter feed mechanisms, a swivelling mechanism, a moving mechanism or the like

Method of mirror-finishing a cylindrical workpiece

A method for mirror processing of an external surface of a long-sized metal piece, by which the external surface is mirror-polished with precision and high efficiency without a surface defect or so that stable dimensional accuracy, such as a roundness and improvement of yield in production, can be obtained. The method comprises the steps of clamping both ends of a long-sized metal piece, applying a positive electrical charge and rotating the metal piece, and moving the long-sized metal in the axial direction through an electrolytic integrated polishing apparatus for processing the external surface of a long-sized metal piece into a mirror surface. The electrolytic integrated polishing apparatus includes a plurality of grindstones pressed onto the long-sized metal piece from the opposite directions or from outside to the rotation axis radially at a constant pressure, and negative electrodes disposed so that each of the grindstones is disposed between the electrodes in the circumferential direction so as to integrate abrasion of the long-sized metal piece by grindstones and concentration elution by an electrolyte for mirror processing of the external surface of the long-sized metal piece.

Method for mirror process of external surface of long sized metal

The invention relates to a device and method for electromechanically roller burnishing a surface of a workpiece, in which precisely one current-guiding roller burnishing element for roller burnishing and one separate electrical contact element are used and, as the roller burnishing element is moved on the workpiece surface, said electrical contact element is guided thereafter such that a current path of a constant length is directed through the workpiece as roller burnishing takes place. The invention allows, in a cost-effective manner, a high surface quality to be achieved as well as a precisely-adjustable microstructural alteration to the upper layers of the workpiece.

Device and method for electromechanically-assisted roller burnishing

A method of electrolytically grinding a workpiece into a desired cylindrical shape by applying a voltage across a grinding wheel rotating at a high speed and a workpiece rotating at a low speed, and supplying an electrolyte between said grinding wheel and workpiece, wherein said workpiece is fed in a tangential direction of said grinding wheel and concurrently rotated at a low speed, and said grinding wheel and workpiece at the outset of the grinding operation are set in such a positional relation that the tangential lines of said grinding wheel and workpiece, extending parallel to the feeding direction of the workpiece and closer to said workpiece and grinding wheel respectively, are located beyond each other with respect to the centers of said grinding wheel and workpiece respectively and spaced from each other by a distance just equal to the desired depth to be cut off of the workpiece.

Karl Wieck Dipl-Ing

Papers

Apparatus for electrolytically honing the exterior surface of a cylindrical workpiece