CONFIGURATIONS AND MODULARIZATION GRADE OF SOME CNC TURNING MACHINES

Adrian GHIONEA, George CONSTANTIN, Dumitru CATRINA,

Alina VINTILESCU, Laurenţiu Cicerone POPA

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Abstract: This paper presents an analysis regarding the configuration and structure of the kinematic couples of rotation and translation of some mono and multiaxes lathes with increased level of universality and flexibility built in modular approach. The schematic representations use usual symbols and notations assigned to the structure elements and generating assemblies and also the CNC axes. For each representation a structural formula is supplied. On the basis of the schematic and structural formula the method of transformation for two closed structure elements is proposed. Using the same approach, the matrix of transformation attached two the two branches of tool and workpiece connected in a fictitious mechanism T-WP. The results of the application consist of the parametric equations of the generated trajectory that represents the generatrix and directrix curves that define the machined surface. The presented analysis shows that the variants of modular lathes enable the rapid change of the machine configuration depending on the generating technological necessities of different surfaces.  

Key words: CNC lathe, kinematic couple, generation motions, CNC axis, structure element, basic modules, generated trajectory.