Characterization Of The Magnetic Abrasive Finishing Method And Its Application To Deburring

Key Engineering Materials Vols. 291-292 (2005) pp. 291-296 online at http://www.scientific.net © 2005 Trans Tech Publications, Switzerland Characterization of the Magnetic Abrasive Finishing Method and Its Application to Deburring Y. M. Baron1 , S. -L. Ko2 and J. I. Park 2 1 2 St.Petersburg State Polytech University, St.Petersburg, Russia Dep. of Mechanical Design and Production Eng., Konkuk University, Seoul, Korea Center for Advanced E-System Integration, Konkuk Univ. Keywords: magnetic abrasive finishing (MAF), deburring, inductor. Abstract. This paper analyzes the effectiveness of using Magnetic Abrasive Finishing (MAF) to remove burrs on drilled holes located on planes. Basic elements of the equipment in this method are a magnetic inductor; powder with magnetic and abrasive properties, which serves as the cutting tool; and the face electromagnetic inductor and the vibrating table, which were developed for deburring and finishing on flat surfaces. The performance of magnetic abrasive powders produced by industry is also evaluated. A new technique was developed to compare the performance of the magnetic abrasive powders and to find the powder that is appropriate for finishing and deburring drilled holes placed on a plane steel surface. Introduction Burrs are widespread defects of machining. Their removal requires additional technological operations, time, and cost. Burrs are often removed manually, despite today’s high level of automation. Burrs formed in drilling induce difficult technological problems, for several reasons. The removal of these burrs after drilling with a countersink does not always have satisfactory results, as countersinking creates secondary burrs inside a hole and forms an undesirable chamfer on the hole edge [1]. Magnetic Abrasive Finishing (MAF) may solve this problem. It does not create secondary burrs but instead, produces a round edge, the radius of which can be managed [2]. MAF has been successfully applied to deburring on a workpiece contour after sheet metal stamping [3]. However, deburring on planes of workpieces using the MAF method requires more investigation. The authors have published some aspects of their research on this area [4 and 6]. In this paper the authors describe their investigation on deburring of planes with using the electromagnetic inductor and the vibrating table. Investigation of Deburring on Planes after Drilling by MAF Method Electromagnetic Inductor. The electromagnetic inductor was used as a source of a magnetic field (Fig. 1). The internal and external poles on its bottom face plane were separated into sectors of rings to increase the concentration of the magnetic flow in a working gap and to create additional radial edges, “e”, as concentrators of