The cutting performance relates to the dynamic properties of the whole system of the tool, spindle, and machine tool frame. The impact of the machine frame properties on the dynamic properties at the tool end point is studied both experimentally and using a coupled simulation model. Coupled model of the whole mechanical system is created as a system joining the spindle detailed model and machine frame FE model. Shift in the spindle and tool system dynamic properties, related to the machine frame properties, is proved using the coupled model. Experimental verification of the FRF evaluated at the tool is extended also by cutting tests. Good match of the simulated dynamic properties of the whole system with the real behavior is found. Keywords Spindle dynamic properties. Machining productivity. Machine frame and spindle coupled model. Modal decomposition. FEM Nomenclature A, B, C, D state space matrices E identity matrix Λ spectral matrix q vector of displacements in modal coordinates y vector of displacements in physical coordinates
The paper deals with the influence of linear feed drive controller setting of a CNC turning lathe on the stability of machining. A coupled simulation model of feed drive control and ball screw drive mechanics with
a transmission belt was created and validated by the feed drive diagnostic measurements. The influence of drive control on the overall dynamic compliance at the TCP and the limits of stable depth of cut was examined. Impact of the feed drive actual kinematics configuration on the stability limits was studied as well.
Modelling of cutting forces is important for understanding and simulation of the machining processes. This paper presents cutting force modelling of data obtained from machining of C45 carbon steel with a coated carbide tool. The model is based on a rather extensive measurement of 270 combinations of cutting tool geometry parameters (rake angle, clearance angle and helix angle), tool wear (flank wear average value), chip thickness and cutting velocity. The model with the friction and cutting component of the cutting force is presented and discussed. We conducted an analysis of the identified model and found a relationship between the increase in tangential and radial cutting forces and tool wear. We concluded that flank wear influences the cutting force acting on the worn tool more significantly than cutting tool geometry. This is caused by changes in cutting edge geometry and the resultant significant increase in the friction component of the cutting force as is shown using the identified model.
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