Aspectes regarding optimal design of machine tool feed drives
Journal Title: Proceedings in Manufacturing Systems - Year 2015, Vol 10, Issue 4
Abstract
The paper presents some of the main aspects concerning the design of feed drives of machine tools in optimum conditions. Some general considerations about the optimization vector including a set of parameters are presented. Also the optimization vector is analyzed and purpose function discussed, revealing the optimization vector as a favourable one having a limited number of parameters. Starting from the dynamic equation of the feed drives having as final mechanism the screw nut and pinion rack, respectively, the relation of the reduced moment of inertia to the electric motor rotor axis together with the expression of acceleration of the speed are presented. For four cases of transmission between motor and final mechanism in the feed drive, the relations of the optimum values for the optimization parameters (gear ratios, belt transmission ration, screw pitch, pinion diameter) are given. The problem of optimization is treated also by considering the expression of rotor acceleration as a function of two variables (where possible) and by finding its maximum together with the optimum parameters. Finally, the CAD models for the studied cases are used to obtain other information, such as the maximum torque supplied by the electric motor in optimum conditions. All applications are considered for an industrial project of refabrication of a machine for processing wheel set running profiles by turning, especially the feed drives that become specific for numerical control.
Authors and Affiliations
G. Constantin, N. Predincea
Keywords
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