组合机床的部件合成(中英).docVIP

Modular Synthesis of Machine Tools M. Zatarain, E. Lejardi, F. Egatia Submitted by R. Bueno Received on December 30, 1997 Abstract In the current state of the art, calculation of static and dynamic behaviour of machine tools requires themodelling of the complete structure and components by the Finite Element Method. If calculation at several machine positions is required, major adaptations of the FEM model are needed. The article shows a method by means of which precalculated structures can be used to obtain the complete model of the machine at any position of its axis in a very straightfoward way. Besides being ahelpful tool for the analysis of a particular machine, the method permits the organisation of a database in which general-purpose modules can be introduced for the calculation of the complete machine in a very short time. The whole method and database have been programmed, and results obtained correlate very closely with the ones obtained by the classical FEM. Kevwords: Machine, Module, Dynamics. I. INTRODUCTION Currently, there is a tendency in the direction of the conception of modular machine tools [3]. This concept would permit to produce better machines with lower costs.Another important advantage derives from the reconfigurability of the machines produced, as the automotive industry is requiring nowadays. One of the reasons for the cost reduction of modular machines is the speed gained in the design. The designer just selects the modules out from a catalogue and fit them together. Then, he evaluates if all the design requirements are fulfilled. Amongst the requirements demanded from machine tools,we can point up that of the static and dynamic behaviour.The Finite Element Method (F.E.M.) is, nowadays, the most powerful tool for structural analysis, and is systematically used by many machine tool manufacturers as a means to guarantee the performance of their new designs. Unfortunately, structural calculation by the Finite Element Method is very time con