Basic Principle And Experimental Study Of Edge Burr Of Hole By Magnetic Particles Grinding

The rapid development of equipment manufacturing industry puts forward higher technical requirements for mechanical parts and components.As a very common processing technology,hole-making was widely used in manufacturing a variety of mechanical parts.Current drilling methods include drilling,milling,boring,EDM and laser drilling.Drilling and milling hole-making technology was the most widely used in aerospace field.But these processing forms will make the hole exit and entrance produce some burrs,burrs will bring great hidden dangers to future product assembly,so it must be removed.At present,manual grinding was often used to remove burrs on edges of holes.Because of the large number of holes,the task of process was the most arduous,and it was difficult to ensure the efficiency and quality of burr removal by manual methods,and the consistency of burr removal was poor.And the grinding method will directly affect the surface quality of the hole.The magnetic particles grinding method has the advantage of "cusp effect" in finishing surface materials,which can quickly remove the burrs on the edges of holes and edges.Based on the mechanism of magnetic particles grinding,a new method was proposed to improve the efficiency of edge burr removal by planning the grinding path.The quality of edge burr removal was improved by studying and analyzing the grinding process parameters.Two kinds of typical burrs,plane hole edge burr and cross hole edge burr,were selected as the main research objects.In this paper,two different grinding schemes were designed to remove the edge burr of TC4 plane hole,and the feasibility of the experiment was studied.When the burr at the intersection line of Al 7075 cross hole was removed by grinding,the influence of grinding trajectory and magnetic pole grooving mode on the grinding was discussed.The surface morphology,burr height and surface roughness were taken as the main evaluation indexes.The main conclusions are as follows:(1)In the research of removing edge burr of TC4 plane hole by magnetic particle abrasion,two different ways of removing edge burr of TC4 plane hole by magnetic particle abrasion were put forward,and magnetic field simulation analysis of magnetic pole was carried out by ANSOFT software,at the same time,cutting pressure of magnetic particle by edge burr of hole was simulated by ANSYS software,and force on edge burr of hole during abrasion was divided.The feasibility of the experimental study was further confirmed and the theoretical basis was provided.Box-Behnken experiment was designed by response surface method,and the main grinding parameters were studied.The optimized experiment was designed and completed,including magnetic pole speed,magnetic particle size and grinding fluid filling.The influence rule of grinding parameters on the test results was obtained,which greatly improved the removal efficiency of edge burrs at the outlet of planeholes.The traditional grinding method and improved grinding method were compared.The results show that the surface morphology of the magnetic particle grinding hole was better and the grinding quality was better when the magnetic pole rotates.(2)When studying the edge burr at the intersection line of Al 7075 cross-hole by magnetic particle grinding,two kinds of grinding trajectories are proposed.The magnetic field of the magnetic pole was simulated and analyzed by ANSOFT software,the shape and structure of the magnetic pole was improved,and the magnetic field distribution was improved.Through a series of experiments,the optimum technological parameters for removing the edge burr of the cross-hole are found,and the burr was completely removed.The micro-morphology of the inner wall was greatly improved.