Effect Of Abrasive Arraying Forms On The Grinding Performance Of A Pressurized Internal-cooling Grinding Wheel

GH4169 superalloy has been widely used in the fields of aerospace,ship and chemical industry because of its excellent high temperature strength and thermal stability.However,due to the lower efficiency of conventional cooling technology and the randomness of abrasive arrangement,the phenomenon of “burn” is prone to produce in the workpiece surface by the high grinding heat generated in the grinding process,which greatly restricts the machined accuracy and surface quality of parts.Therefore,they are of great significance to explore a new grinding cooling technology and study the effect of abrasive arraying forms on the grinding performance.In this paper,an pressurized internal-cooling grinding wheel with ordered abrasive is designed and prepared based on the pressurized internal-cooling principle.The grinding efficiency is improved and the excellent machining surface quality is obtained through adopting the technology of pressurized internal-cooling and ordered abrasive.The main contents are as follows:Firstly,the structure of pressurized internal-cooling grinding wheel with ordered abrasive is designed,and the intensity analysis of the grinding wheel matrix structure is completed.The parameter selection of the abrasive arraying forms are analyzed by the finite element simulation.According to the design parameters of grinding wheel structure,the parts and jigs are prepared.Moreove,the brazed CBN grinding wheels with random or ordered abrasive are carried out by the vacuum brazing technology.The surface topography of grinding wheels are detected and analyzed by three-dimensional microscope of super depth field and the image processing technology with MATLAB,and the abrasive parameters for the finite element model of grinding simulation are extracted.Secondly,the three dimensional simulation of grinding process on GH4169 superalloy is completed by the finite element software ABAQUS,and analyzed from two aspects of the srandom and ordered abrasive.Through comparing the changes of the grinding force,grinding temperature and surface topography in the grinding process,the effects of the srandom and ordered abrasive on grinding performance are studied.Finally,the grinding experiments of GH4169 superalloy are performed by adopting the pressurized internal-cooling grinding wheels.With the single factor experiment method,the grinding force,grinding temperature and surface quality including surface roughness,surface micro-hardness and surface topography are compared and studied under the condition of different grinding parameters.And the research on grinding performance of grinding wheel are completed under the condition of different cooling ways,different abrasive arraying forms and different abrasive size.By adopting the central composite design method(CCD),the effects of different grinding parameters on grinding performance are studied.In order to obtain the optimal grinding parameter combination within the design scope,the grinding parameters are optimized by MINTAB software.