| As an important type of cutting tool in modern manufacturing,the integral end mill is widely used in aerospace,equipment manufacturing and automotive manufacturing.With the significant increase in cutting speed,the variable pitch milling cutter is gradually gaining recognition due to its excellent vibration resistance.However,the problems of structural asymmetry and eccentricity caused by variable tooth pitch make it difficult to guarantee the dynamic balance accuracy during highspeed cutting,which greatly limits the application of unequal pitch end mills.In order to improve the dynamic balance accuracy without affecting the cutting performance of unequal pitch end mills,this paper intends to establish a mathematical model of the grinding wheel shape attitude and the parameters of the chip tank,to study the influence of the grinding wheel attitude and shape on the groove shape during the sharpening of the chip tank,and to achieve the purpose of improving the dynamic balance accuracy of end mills by micro-adjustment of the chip tank.Firstly,the grinding wheel shape and shape of the groove parameters are modelled.A mathematical model of the grinding wheel used for grinding was established.By analysing the correlation between the grinding parameters of the chip tank and the shape of the grinding wheel,the modelling idea of the shape of the grinding wheel and the parameters of the chip tank is proposed.The mathematical model between the grinding wheel shape posture and the structure parameters of the chip tank is established and its accuracy is verified to lay the foundation for subsequent research.Secondly,the chip-tolerant slot shape grinding algorithm was investigated.Using the mathematical model established between the wheel shape attitude and the structural parameters of the chip tank,the influence of the wheel shape(thickness,diameter)and wheel attitude(swing angle,centre point)on the parameters and shape of the chip tank was calculated.Based on the resulting rules,a chip flute grinding algorithm is proposed and verified by graphical simulation to support the mathematical model developed.Then,the mathematical model of the radially cross-sectioned chip flutes of the end mill and the grinding area of the grinding wheel are investigated.By analysing the structure of the chip flutes of the end mill,a mathematical model of the radial crosssectional shape of the chip flutes and the edge line is established according to the derived chip flute shape.Finally,the numerical simulation and experimental verification of the end mill chip flutes are carried out.Combined with modal and harmonic response simulations,the dynamic performance of end mills with different chip flute shapes is investigated,and the chip flutes are sharpened using NUM grinding simulation software. |
