Configuration Method of Fixing System with 2-Dimensionally Low-Frequency Vibration for Drilling to Decrease Influence from Unintended Displacement of Workpiece
Ivan Burdukovskyi, Jun’ichi Kaneko, and Kenichiro Horio
Department of Mechanical Engineering, Graduate School of Engineering, Saitama University
255 Shimo-Ohkubo, Sakura-ku, Saitama City, Saitama 338-8570, Japan
Micro deep drilling of hard materials requires introducing of step feed in process that increases machining time. To decrease the machining time by increasing the step feed, we apply low-frequency vibration (∼10 μm, 150 – 250 Hz) to the drilling process by oscillating the workpiece. To cope with the low-frequency vibration-assisted drilling of a curved surface, we have developed a fixing system for 2-dimensional vibration. The Fixing System for 2-Dimensional Vibration (FS2DV) consists of horizontal, and vertical actuators plus spring systems with variable rigidities along the directions of the actuators. A thrust force of 6 – 10 N from the drilling process may induce an unintended displacement of the workpiece. If the rigidities of the horizontal and the vertical spring systems are not balanced, unintended displacement may create diameter error during the drilling process. In this study, a method is proposed for configuring of the FS2DV with balanced spring systems to minimize the effects of the unintended displacement on diameter error. Frequency response function analysis of the vertical and horizontal spring systems is done for successful use of the FS2DV during the low-frequency vibration-assisted 2-axis drilling. Based on this analysis, setting requirements for the FS2DV are proposed for a particular vibration frequency. The behavior of the resultant vibration is evaluated while force is loaded along the intended angle of the drilling process. As a result, the effects of unintended displacement at the FS2DVare decreased for use within the vibration frequency range of 150 – 250 Hz with the vibration amplitude of 10 μm. The system can be used properly with a thrust force of up to 10 N and any angle from 0 to 90° by selecting appropriate rigidities for the spring systems.
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