Research On Wire Bow Model And Process Parameters Of Diamond Wire Cutting Machine

Diamond wire cutting has the characteristics of high efficiency,stability,various processing sizes and varieties.It is the main method of processing brittle and hard materials.In industrial production,the size and material type of brittle and hard materials are changeable,which needs to be cut with cutting machines with different spans.Its process parameters are mainly determined by manual experience and trial cutting test,which has low efficiency and high cost.This paper adopts the method of theoretical derivation combined with finite element parametric calculation,and through experimental verification,establishes the asymmetric arc wire bow theoretical model of diamond wire cutting,analyzes the theoretical relationship between cutting machine process parameters and wire bow parameters,provides theoretical guidance for the determination of process parameters,and designs experiments to study the influence of process parameters on workpiece processing quality.The main research contents include:(1)This paper analyzes the force on the line bow from the perspective of diamond particles,deduces and explains that the cutting force can be simplified into a uniform load of equal size,calculates the shape of the line bow through the finite element method,puts forward the line bow hypothesis of asymmetric arc,fits the circular arc line bow according to the finite element calculation results,analyzes the fitting error,and proves the feasibility of the asymmetric arc line bow hypothesis.(2)The sensitivity of boundary conditions to pantograph parameters is calculated by finite element parameterization,which provides a basis for calculating the three-point deflection of circular arc pantograph and simplifying the boundary conditions.Combined with the geometric relationship of asymmetric circular arc,the asymmetric circular arc pantograph model is constructed,and the two numerical calculation results of endpoint tension in Pantograph parameters are compared and analyzed.The rationality of asymmetric circular arc assumption is proved from the perspective of theoretical calculation.(3)The single wire cutting experimental platform is built,the theoretical model is verified,the influence of the maximum deflection in the wire bow parameters on the product surface roughness is analyzed,and the influence of the end tension difference on the product surface quality difference is analyzed.According to the experimental measurement data and the change law of cutting force and deflection in the theoretical model,the various stages of the change of wire bow in the cutting process are obtained,The role of material cutting time in the selection of process parameters is analyzed.(4)The load of a multi wire cutting machine is calculated and obtained by using the theoretical model,and the normal and axial deformation laws of the grooved wheel are calculated by finite element method.Combined with the theoretical model,the causes of the change of wire mesh tension caused by the deformation of the grooved wheel,which affects the machining quality of the same batch of workpieces are analyzed.The multi wire cutting experiment is designed to prove the influence of the deformation of the grooved wheel on the machining quality of a single batch of workpieces at different positions.