Papers by Keyword: Electrofinishing

Abstract: For the purpose of elevating the efficiency of the finish effect to reach the fast improvement of the surface roughness of the plane surface, so as to reduce the residual stress on the surface efficiently. This study discusses the plane surface after traditional grinding machining, of which the plane surface used a new design of finish-tool includes a nonconductive burnishing-tool and a negative electrode to execute the simultaneous processes of burnishing and electrofinishing. In the experiment, the use of the small thickness of the negative electrode is advantageous to the finish effect. High rotational speed of the finish-tool produces better polishing. Higher current rating with quicker workpiece feed rate effectively reaches the fast improvement of the surface roughness of the workpiece. The finishing effect is better with longer off-time because discharge of the electrofinishing dregs becomes easier. The experimental results show that the supply of current rating is near concern with the position of the negative electrode and the burnishing-tool.

Abstract: The current study involves the use of ultrasonic vibration of the electrolyte to assist in removing electrolytic product and cuttings from the machining gap in the surface finish process of grinding and electro-finishing the inside surface of a tapered hole. The design of the finish-tool includes a taper grinding-tool joined to an electrode. In the experiment, the finish-tool is gradually fed into the taper hole and the electrode is used with continuous or pulsed direct current. The experimental results show that a high current together with ultrasonic vibration is effective in material removal and in the improvement of the finishing effect. The average effect of the ultrasonic vibration is greater than that of the pulsed current while the machining time need not be longer than the off-time. The finishing effect is better with a wide gap between the grinding-tool and the electrode. A high rotational speed of the finish-tool guides and discharges the dregs and cuttings efficiently and also improves the finish. The simultaneous use of ultrasonics with grinding and electro-finishing (SUGEF) also shortens the time it takes make the inside wall of the tapered hole smooth and bright.

Abstract: This study discusses a method for increasing the efficiency and speed with which an improvement in surface roughness of a hole-wall surface can be achieved. The surface after traditional machining is discussed as well as a method for finishing the hole-wall surface using a design of finish-tool that includes a nonconductive knothole-form burnishing-tool and a ring electrode to execute simultaneous burnishing and electrofinishing (SBEF). By the dual and synchronous effect of the electrode and the burnishing-tool a superior hole-wall finish is achieved. In the experiment, the use of a small arc rounding radius and a thin finish-tool is advantageous to the finishing effect. A high rotational speed of the finish-tool produces a better finish. A high current and a faster finishing tool feed is also effective in gaining a rapid improvement of the roughness of the hole-wall surface and is recommended from the results of the current study.