Технічна інженерія (Nov 2023)
The influence of the shape of the processed detail on the resistance forces during magnetic abrasive machining
Abstract
The method of magnetic abrasive machining (MAM) is a promising method of finishing parts of complex shape, however, limited information about processes and phenomena prevents the full use of the method in industry. To solve this problem, further experiments are necessary, especially aimed at the study of an important factor of the forces acting on the detail from the MAT side. Samples in the form of prismatic columns with a height of 30 mm and different shapes, made of para- and ferromagnetic material with characteristic cross-sectional dimensions of 8, 12 and 16 mm were used in the research. The shapes of the cross-sections of the parts are a cylinder, an isosceles triangle and a square. The speed of movement of parts in the working area was 1-3 m/s, magnetic induction 0.1-0.25 T. Magnetic-abrasive powders from which MAT was formed are Polymam-M and Polymam-T with grain sizes of 200/100 and 400/315 microns. It was determined that the shape of the parts does not have a direct effect on the value of the resistance forces, however, the shape significantly affects the pressure of the MAT on the surface of the part. The ratio of the value of the specific resistance for parts of different shapes was calculated and presented in the form of a coefficient. The reasons for the occurrence of such ratios are analyzed. The phenomena that occur between the pole tips and the side surfaces of the part during the processing of large-sized parts made of ferromagnetic material are shown. The influence of this phenomenon on the strength of resistance during processing is explained. Recommendations for further research have been developed.
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