Morphology Simulation And Experiment Research Of Trepanning Machine Brittle Material By Consolidated Abrasive Core Drill

Hard and brittle materials such as optical glass and advanced ceramics have excellent properties such as high strength,high hardness,high temperature resistance,and corrosion resistance.They have been widely used in high-tech industries such as integrated circuits and optical instruments.Consolidated abrasive material nesting processing plays an important role in the trepanning and hole making process of hard and brittle materials.However,the defects such as edge chipping and surface damage in the processing of hard and brittle materials have not been effectively solved,which restricts the development and application of this technology.This paper is based on the self-designed deep hole trepanning equipment.Through the surface topography measurement of the fixed abrasive core drill teeth,a three-dimensional model of the core drill tooth surface topography is established.Based on this,the machining process is simulated and analyzed.Combined with the K9 optical glass trepanning processing experiment,the material removal mechanism and the influence of process parameters on the processing quality and grinding force are comprehensively analyzed,which provides a reference for improving the processing quality and selecting reasonable process parameters.Relying on a set of self-designed deep hole trepanning processing equipment,introduce its structure and working principle.Taking into account the processing characteristics of hard and brittle materials,the feed transmission system of ordinary lathes has been improved to meet the processing quality requirements.Combining the working mode of the equipment and the fixed abrasive teeth,the trajectory of abrasive particles and the depth of abrasives are analyzed,which lays the foundation for subsequent surface topography analysis and simulation.A method for measuring and modeling the surface morphology of the core drill bit with fixed abrasives is proposed.Based on the ultra-depth of field three-dimensional microscopy system to measure the surface of the consolidated abrasive core drill tooth surface morphology,the results show that the shape of the abrasives is approximately truncated octahedron,the distribution is sparse overall,some of the abrasives are densely distributed,abrasive size and protrusion height obeys the law of normal distribution.Based on the measurement results,the abrasives were simplified into truncated octahedrons,and under the condition that the abrasive did not interfere with each other,the abrasives were randomly distributed on the surface of the tooth model,and then the three-dimensional surface topography of the tooth was established in line with the physical characteristics.model.The finite element simulation of K9 optical glass processing by the fixed abrasive trepanning drill is carried out.Based on the three-dimensional model of surface topography of core drill,the abrasive grinding depth model and the trepanning grinding motion mode,a finite element model of regionally consolidated abrasive teeth grinding optical glass is established;through the simulation of grinding process,it is analyzed material removal process and the change law of the grinding force;by changing the spindle speed and feed rate,the influence law of grinding force under different process parameters is studied.The results show that the normal grinding force is positively correlated with the feed speed,and negatively correlated with the spindle speed.Completed the trepanning processing experiment of K9 optical glass.Relying on the self-designed deep hole trepanning equipment,use the fixed abrasive nest drill to carry out the experiment on the optical glass,and analyze the spindle speed and feed speed for the material removal rate,the edge collapse of the inlet and outlet,the surface quality and the grinding The law of influence of force.The results show that the entry chipping and surface quality of the workpiece are significantly affected by the process parameters.High spindle speed and low feed speed are beneficial to improve the size and surface quality of the entrance chipping;the edge chipping at the exit is particularly serious,which is manifested as the material fragmentation.Fracture is less affected by process parameters.In addition,the comparison between the experimental value of the grinding force and the simulation value shows that the simulation method of the multi-abrasive machining process considering the actual surface topography of the tool is reasonable and effective.This paper has completed the analysis of processing efficiency,processing quality,grinding force and process parameters of trepanning brittle material.