# Improving the Micro-Hardness of Brass-Plate Alloy CuZn28 According to Optimum Geometry of Magnetic- Inductor and Pole by MAF Method

## Abstract

Magnetic abrasive finishing (MAF) a non-conventional finishing process, is suitable for all types of materials Preventing the problem of micro-cracks and fundamental normal stresses, that produced by the traditional finishing method. MAF process improves the quality and properties of the surface layer. The main objective of this research is to study the effect of geometry shape for inductor and pole on the micro-hardness, then finding the optimal shape that improves the value of (?Hv) in the surface layer and improves the MAF process. Nine different geometry shapes (inductor and pole) are considered. Taguchi matrix L9 is used for designing experiments to find the influence of parameters (radius of hole, angle of the core, angle of the pole, the radius of the pole) with 3levels on (?Hv). The experiments are Analyzed and improved using Minitab 18 software. It is concluded that the optimum parameters that reach to optimum (?Hv) are (radius of holeR_3 (9mm),angle of core ?_1(82°), angle of pole?_1 (60°), the radius of poler_3 (18mm). The most significant factor that influences (?Hv) is an angle of the pole ? (43.21%) followed by radius of pole r (39.76%) in the MAF process. In addition, the maximum improvement in (?Hv) by 13% of the overall experiments test.