Simulation And Experimental Research On Auto Splicing Die Instantaneous Milling Force

Milling technology of automobile complex surface splicing die reflects automobile mould manufacturing level,is one of the main development field of automobile manufacturing and key technology research.But because the mold is large in size,the overall curvature is complex,usually by a variety of different hardness materials and splicing.Therefore,in the process of complex surface splicing die ball head milling,extrusion tool and workpiece hardness change of instantaneous contact,resulting in changes of milling force milling splicing when working conditions are more complex than single hardness,difficult to control,and these changes will lead to sharp decline in tool wear,machined surface quality etc.The research of milling force variation characteristics of domestic for complex surface multihardness splicing situation is not much.So it has very important theoretical value and practical significance of milling force of complex surface hardened steel mosaic.First,based on the geometric features of the surface,the influence of the radius of curvature on the cutting angle of the cutter is studied,as well as the rake angle and axial cutting angle effect on undeformed chip thickness,considering the cutting trajectory is a spatial curve with the time change,after the chip on a surface before and after cutting thick control between the point will vary with the rotation angle of the blade and the time interval(delay time),which makes the cut chip three-dimensional shape with spatio-temporal correlation characteristics,combined with three-dimensional trochoid cutting path establishment of undeformed chip model.Then,based on the idea of differential,the transient milling force model of three axis ball end milling with complex surfaces and multi hardness stitching dies was established;The model takes into account the influence of impact vibration during spelt joint,change of the cutting angle between tool and workpiece and changes in the hardness of the processed materials on the transient milling force.Finally,the corresponding optimization plan for automobile panel die processing technology is put forward,and typical automobile panel milling experiment is carried out.It is proved that the process optimization plan is beneficial to improve the machining surface accuracy of dies.Based on the milling model of ball end milling cutter,the reliability of the model is verified,and the milling force changing rule under different conditions is analyzed.