Property Testing Of Magnetorheological Gels And Research On Flexible Abrasive Belt Grinding

With the development of photoelectric products and mechanical products to miniaturization and high surface quality,the demand for surface finish processing of hard and brittle materials is increasing.The traditional finishing processing method adopts the free abrasive particles and the fine abrasive precision machining,the degree of automation is low.In this paper,magnetorheological Gels(MRGs)intelligent materials were prepared and its rheological properties were tested under magnetic field changes.The magnetorheological Gels was filled into the abrasive belt contact wheel and assembled into the manufactured abrasive belt grinding device.Abrasive belt grinding experiments of titanium alloy with magnetic field assistance were carried out.The main research content of this paper include:(1)The samples of the gelatin based magnetorheological Gels with different iron powder mass fraction were prepared.The viscoelastic mechanical properties and magnetorheological effect of different samples under the change of magnetic flux intensity were measured by rheometer.The magnetorheological Gels material showed obvious shear thinning,With the increase of iron powder mass fraction and magnetic flux intensity,the apparent viscosity and shear stress of MRG Materials increase significantly.the material transforms into a solid-like state.(2)A abrasive belt grinding device was designed and manufactured The abrasive belt grinding device consists of mechanical transmission parts,clamping lifting device and excitation device.Ndfeb permanent magnet N50 is selected as the magnetic field generating device The design optimizes the shape and size of permanent magnets,Its linear air gap generates a local gradient magnetic field.The magnetic field distribution and magnetic flux intensity in grinding area were analyzed and calculated by ANSYS Maxwell software,The maximum magnetic flux intensity in the grinding area is 610.58 m T,The magnetic field width above 500 m T is18.56 mm.(3)Process and assemble the components of the belt grinding device.Design experimental scheme.The grinding experiment of TC4 titanium alloy with silicon carbide sand belt was carried out in a gradient magnetic field.The effects of grid size,spindle speed and depth of cut on workpiece surface roughness and material removal were discussed,The material removal mechanism was analyzed.The surface roughness of TC4 titanium alloy was reduced to Ra0.323μm.The optimal combination of grinding parameters was obtained as abrasive grid size 1000#,rotating speed700r/min and cutting depth 0.2mm.