Abstract
On the basis of ordinary plane magnetic abrasive finishing, a finishing method is proposed that can improve the flatness of a plane workpiece. In this method, the feed speed is varied during finishing according to the profile curve of the initial surface and the material removal efficiency, to control the effective finishing time in different areas and thereby improve the surface flatness. A small magnetic pole with an end face diameter of 1 mm is designed, and a ferromagnetic plate is placed under the workpiece to improve the uniformity of the magnetic field distribution near the magnetic pole. An experiment on an A5052 aluminum alloy plate workpiece shows that after 60 min of finishing using the proposed method, the extreme difference of the workpiece surface can be reduced from 14.317 μm to 2.18 μm, and the standard deviation can be reduced from 3.322 μm to 0.417 μm. At the same time, according to the measurement results, a similar flatness can be achieved at different positions on the finishing area. Thus, the proposed variable-speed finishing method leads to obvious improvements in flatness.
Highlights
In magnetic abrasive finishing (MAF), a mixture of abrasive and magnetic particles is formed into a flexible brush-like structure under the action of a magnetic field on the latter particles, and this magnetic brush is driven by a motor to move in contact with the surface of a workpiece
Misra et al.13 established a mathematical model of material removal in ultrasonic-assisted magnetic abrasive finishing (UAMAF) and found that the overall removal of material can be attributed to two simultaneous independent phenomena: steady-state material removal and transient material removal
A method to improve the surface flatness of a workpiece by using a variable feed speed in magnetic abrasive finishing has been proposed, and its theoretical basis has been explained in detail
Summary
Shinmura and Aizawa conducted a detailed study of the basic principles and characteristics of MAF and developed a plane magnetic polishing device using electromagnets They applied MAF to the finishing of a cylindrical outer surface and to tube surface finishing and analyzed the influence of magnetic pole shape on finishing performance.. Zou et al. proposed a method for surface polishing of alumina ceramics using a low-frequency AC magnetic field MAF process and studied the influence of important process parameters on the finishing performance. They analyzed the feasibility of finishing A5052 aluminum alloy plate and analyzed the influence of relevant process parameters on finishing performance. Their experimental results showed that the surface roughness of A5052 aluminum alloy plate improved from 318 nm to 3 nm within 15 min.
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