Experimental Research On The Precision Finishing Of Inner Surface Of Blind Hole

In recent years,equipment manufacturing has developed rapidly,and the application of blind hole parts has become more and more extensive,the surface quality of the blind hole has a great influence on the assembly accuracy and service life of the parts.It is difficult to process the surface of the blind hole,the grinding process is more commonly used,and the grinding effect directly affects the performance and reliability of the blind hole.magnetic abrasive finishing as a new processing technology,the machining principle is the use of a magnetic field pole will adhere to the gap between the magnetic pole and workpiece in the magnetization of the magnetic abrasive and form a certain cutting ability of "magnetic brush attached to the surface,The precision finishing of the inner surface of the blind hole is realized through the relative friction,erasing and cutting between the magnetic particle brush and the workpiece.In this paper,based on the study of magnetic abrasive grinding mechanism,two sets of experimental devices are designed,experimental study on the feasibility,and the experimental results are analyzed,and the device to get the optimal experiment scheme.Respectively for 45 steel,SUS304 stainless steel,Al6061,three of typical materials blind holes in a series of simulation and experimental study,mainly on the surface roughness and surface topography index,analysis of main influencing factors of influence the magnetic abrasive finishing process and its effect,the specific contents include the following aspects:(1)The development status,concept and characteristics of magnetic particle grinding are described,and the main research contents and objectives of this topic are put forward.The force of magnetic abrasive particles in magnetic field is studied,the magnetic abrasive machining of micro removal model is established,analyzes its processing mechanism,theoretically confirmed that the magnetic abrasive finishing machining the feasibility of the blind hole inner surface.(2)The design development for the blind hole inner surface magnetic abrasive finishing machining test device,this paper introduces the test data of the equipment,the test pieces of material properties,and using Ansoft software to the magnetization direction of the magnetic permeability and the size of the magnetic induction intensity in the magnetic material processing numerical simulation analysis,provides a theoretical basis for the further experimental research.(3)According to the response surface method designe the box-behnken experiment to study the effects of processing parameters(magnetic pole speed,abrasive particle size and amount of grinding liquid)on the surface quality of the workpiece and the law of its action.The experimental data are summarized and analyzed.,it is concluded that the variation trends of surface roughness values and the significant degree of the influence of different factors,combined with the processed workpiecesurface micro topography,it is concluded that the relatively best parameter combination.(4)To improve the efficiency of grinding process,this paper designs auxiliary pole frame,and the grinding effect of presence of auxiliary tool to carry out the contrast test,after adding auxiliary tool workpiece material removal rate is higher than the traditional magnetic abrasive,and after grinding workpiece surface roughness value is low,in particular,the surface quality of the edge of the blind hole is greatly improved.