Research On The Interaction Between Manufacturing Process And Machine Tool In The Peripheral Grinding Of Indexable Inserts

Cemented carbide indexable insert has the advantages of good processing performance,long service life,easy replacement.It is widely used in aerospace,automotive,marine and other machinery manufacturing fields.However,due to the characteristics of high hardness and brittleness of the cemented carbide material,the surface of the insert is often cracked or burned due to the irrational setting of the process parameters during the grinding of the cemented carbide insert.Moreover,in order to meet the cutting requirements of the product and improve cutting performance,the working surface structure of the tool is increasingly complex.Therefore,the high-precision and efficient manufacturing process of cemented carbide indexable inserts must be study to improve the precision accuracy of the insert.Grinding process parameters influence the machining quality of cemented carbide indexable inserts to a considerable extent,which directly results the deformation of machining process system.Unsuitable process parameters will accelerate wheel wear,increase production costs,and reduce production efficiency.Therefore,in order to improve the machining quality of cutting edges and flank faces of indexable inserts for cemented carbides,based on the geometric characteristics of the flank face and transition surface of indexable inserts,and the structural characteristics of the process system,the improved machining trajectory of indexable inserts,the grinding force model,the dynamic model of the fixture,and the machine-processing interaction method are study.The main content of the essay are listed below:1.The machining trajectory and graphical automatic generation technology for the grinding of the peripheral indexable inserts of cemented carbide are study first.Based on geometry parameters of the insert such as the profile of the insert,the tool celearance and the diameter of the inscribed circle,the machining trajectory model can be established considering the structure of the grinding machine.Using the DXF geometric parameter identification method,the geometric characteristics of the insert drawing can be automatically identified.Then the machining trajectory of the indexable insert is calculated using the machining trajectory model.2.The coefficients of the grain grinding force are identified using the experimental data.Based on the normal distribution model,the surface topography of the grinding wheel was established.To calculate the cutting cross-section area and the wear flat area considering the interference region between the grain paths,the grain element method is proposed.The grain is divided into several elements and the cross-section of the elements is assumed to be a rectangle.The cutting depth of each element is calculated first considering the influence of other grain paths.Then the cutting cross-section area and the wear flat area of each element can be simulated.Combining the grain grinding force model,the grinding force of each element can be simulated.The peripheral grinding force can be modeled by adding the grinding forces of all the grain element.3.A finite element model of the tool and grinding center system is established to analysis the deformation of the grinding center in the grinding process.First,based on the static analysis method,the deformation of the grinding center is calculated using the average grinding force and the simulation data is verified by the laser sensor in the grinding process.Based on the modal analysis and harmonious response analysis,the frequency response function of the blade grinding contact point is established.In order to calculate the dynamic cutting depth and feed rate of the grinding wheel,the dynamic deformation of the grinding center is calculated based on the transient dynamics model using the grinding simulation data.4.A multi-model coupling simulation method is proposed in this paper in order to study the machine-processing interaction.The interaction port of the grinding force model and the dynamics model is established based on the task manager of the windows.Besides,the distributed computation method is used in the spindle-center-force coupling simulation systems based on the socket method.Based on the multi-model coupling simulation system,the interaction of the grinding force and the deformation of the grinding center can be study.Finally,the dynamic grinding force considering the deformation of the grinding center is simulated.