Research On The Cutting Of Helical Milling Of Glass Fiber Reinforced Plastic

GFRP has excellent properties such as high strength,high hardness,light weight and fatigue resistance,and is widely used in military,medical,wind power and other fields.Due to its anisotropy,heterogeneity and other characteristics,GFRP is prone to tearing,delamination and other defects in the hole making process.In this paper,the causes of defects in the GFRP well making process and their inhibition methods are studied in depth.The research is as follows:(1)Through the GFRP spiral milling test,the tangential force Ft,radial force Fr and axial force Fz of the milling process were collected and the range analysis was carried out,and the influence of cutting data on tangential force,radial force and axial force was obtained.Through the co MParison of drilling test and helical milling,it is found that the helical milling method can effectively reduce the axial force.(2)The workpiece tool model is established by Pro E,the simulation model is established based on abaqus,and the spiral milling hole finite element machining simulation is carried out by orthogonal test method.The tangential force Fr,radial force Ft and axial force Fz are obtained,and the range analysis is carried out to obtain the influence law of cutting data on axial force.It is also co MPared with the test to verify the correctness and rationality of the simulation model.(3)The cutting force process of spiral milling and drilling process was analyzed,and it was found that spiral milling could effectively reduce the axial force,and the influence of different cutting parameters on the milling component was obtained by using single-factor test.With the increase of cutting speed,the axial milling force shows a trend of first increasing and then decreasing,and the overall change trend is small.As the rotational speed ω of the tool center increases,the axial milling force gradually increases.As the axial feed pitch increases,the axial milling force gradually increases.(4)Through the decomposition of the milling force of the helical milling hole,the influence of the axial force,tangential force,and radial force on the quality of the helix milling hole was analyzed separately.Through GFRP drilling and spiral milling test,the influence of the two machining methods on the quality damage of the hole wall and the hole making accuracy,as well as the tearing of the inlet and outlet of the two processing methods,were co MPared.Through the orthogonal test of GFRP spiral milling hole,the range analysis shows that the influence of different cutting parameters on the surface roughness and aperture error of the hole wall is found.Through the single-factor test,the influence of different cutting parameters on the roughness of the hole wall is obtained,and the influence of different cutting parameters on tearing is obtained through single-factor test analysis.(5)Taking the aperture error,surface roughness of the hole wall,and the axial force of spiral milling cutting as the output characteristic index,and the cutting speed,tool center revolution speed and pitch as the design variables,the GFRP helical milling processing test model was established.The weight coefficient of each output characteristic index in the gray association calculation is analyzed by the principal component method,and based on the gray association analysis model and principal component analysis method,a quantitative method is obtained to measure the correlation degree between each index,and the multi-objective is converted into a single target,so as to optimize the GFRP spiral milling parameters and obtain the optimal design variable combination.