Research On Key Technology Of Fast Manufacturing Of Regular Grain Arrangement Grinding Wheel

Driven by rapid technological progress and rising industrial productivity,aviation,medical,military,chip and other fields of parts and components materials processing accuracy,quality stability and other requirements are increasingly high.There is also a growing demand for difficult-to-machine materials.Grinding has an irreplaceable role in ultra-precision machining in difficult fields.However,traditional consolidated abrasives have been unable to meet the requirements of modern manufacturing due to uneven abrasive particle distribution,low bonding strength,poor grinding surface quality and long preparation period.Therefore,the grinding wheel with regular grain arrangement can solve the current difficulties.Based on this,this paper puts forward a new type of abrasive and orderly arrangement method,combining with the existing superhard abrasive grinding wheel and the advantages and disadvantages of the preparation technology,develops a device for rapid manufacturing of grinding wheels,conducts laser sintering tests,obtains the best parameters and process flow of laser rapid prototyping manufacturing process,and realizes the development of a three-dimensional free profile and optimized arrangement of grinding wheels with abrasives.The main research contents and results of this paper are as follows:(1)the ordering mechanism and spacing mechanism of abrasive particles were studied,a method of regular arrangement of abrasive particles was proposed,and a set of equipment for regular arrangement of abrasive particles was developed.The material required for the experiment was studied.45 steel was selected as the grinding wheel matrix,40/45 mesh diamond as the abrasive grain,and cu-based(Cu-Sn-Ti)powder as the binder.(2)ANSYS finite element simulation software was used to analyze the temperature field of different process parameters,analyze the influence of laser power,scanning speed and spot diameter on the temperature change in the laser sintering process,and obtain the optimal temperature control parameters: laser power 650 W,scanning speed 3mm/s,spot diameter 3mm.(3)The test platform was built,and the grinding wheel was sintered with the process parameters obtained by simulation.The bonding process of sintered region and unsintered region was studied,and the influence law of process parameters on the forming quality of grinding wheel was obtained,which verified the feasibility of the fast manufacturing method of grinding wheel with regular abrasive grain arrangement.(4)The microstructure and metallographic structure of the laser-sintered grinding wheel were observed.The results show that the active element Ti in Cu-Sn-Ti alloy reacts with element C on diamond surface to form carbide Ti C,which plays a transitional and bridging role between the abrasive grains and the alloy.The general law of different residual stress distribution of diamond abrasive particles in laser sintering was obtained by Raman spectroscopy of residual stresses at different depths of abrasive particles.There are 47 figures,9 tables and 65 references.