Research On Milling Performance Of HFCVD Diamond Coated Tools Based On Stone Processing

Due to its beautiful appearance,unique artistic appreciation and high collection value,stone products has won people’s love.With the continuous improvement of living standards and the changing aesthetic standards,the market has become the demand of the types,shapes,precisions and product sizes of special-shaped stone products become greater,and its processing tools,processes and processing characteristics are also required of high levels.Stone is a kind of hard and brittle material.Traditional milling tools has serious wear when processing stone,resulting in low processing accuracy and low economical effect.In recent years,diamond coated tools have been applied in the difficult processing of such materials due to their high hardness and wear resistance,good thermal conductivity and low friction coefficient.However,the lack of theoretical and experimental research on the performance of diamond coated tools for cutting stone has made the advantages of diamond coated tools not fully utilized.The simulation and experimental study on the cutting characteristics of HFCVD diamond coated tool milling natural marble were carried out.The cutting force obtained by finite element simulation was used to analyze the influence of the tool geometry parameters of tool coating,cutting parameters,surface quality and tool wear mechanism,On the cutting performance of HFCVD diamond coated tools.By analyzing the natural marble process of HFCVD diamond coated tool,the tool geometry analysis model is established.The differential milling method is used to establish the theoretical model of tool milling force.The integral method is used to construct the theoretical calculation formula of tool cutting force.The ABAQUS finite element analysis software was used to construct the simulation process of HFCVD diamond coated tool for milling natural stone.The single factor experiment method was used to analyze the geometrical parameters of the tool and the variation of cutting parameters on the cutting force.The research found that the verification experimental data is consistent with the simulation data,and the correctness of cutting parameters and laws are proved.When the tool back angle is 8°,the coating tool has the best cutting performance and the cutting force is the smallest at this time.When the cutting depth is d=1.0mm,the spindle rotation speed is 3000r/min,and the cutting force changes smoothly at the feed speed of 300mm/min.From the perspective of cutting force,it is a superior parameter combination.Diamond coated tools and uncoated tools with different carbon source concentrations milling stone,The cutting force of different tools and different cutting parameters is measured by the force measuring instrument,the surface roughness of the processed material is tested,and the wear of the tool is observed.The results show that coating carbon source concentration has maximum impact on the milling component is Fx and Fz.the depth of cut has impact on the milling component force is the greatest Fy.the feed rate has maximum impact on the surface roughness;when the spindle speed reaches n=3000 r/min,feed rate vv=300 mm/min,depth of cut d=1.0 mm,coating carbon source concentration 3%,tool cutting performance is best;3%coating carbon source concentration diamond tool is better than other Carbon source concentration(including uncoated)tool,the processed stone surface roughness is the lowest,the cutting force is the smallest,the wear resistance is high,the processing precision is improved,and the service life of the tool is prolonged.Compared with HFCVD diamond coated tools,uncoated tools have more wear and tear than coated tools,and the cutting forces are larger.The main failure mode of diamond coated tools is premature coating shedding,and the failure mechanism is mainly due to mechanical wear(Coating peeling,chipping)and bond wear.