Stiffness design of machine tools structures by topology management optimization approach

摘要

The machine bodies are made as welded or cast parts,with relatively thin outer walls,reinforced with ribs that provide the necessary stiffness.Often,empirical formulas,which do not consider the load distribution in different areas of the body and that have an increased security factor,are used to calculate the thickness of the outer walls and the dimensions of the ribs.This approach does not meet modern design and production requirements,as it does not lead to optimal solutions.In the present work,a simulation,based on the finite element analysis methodology,is presented,using the capabilities of the COMSOL Multiphysics software,which allows the simultaneous determination of the magnitude and distribution of stresses from different load cases from machine operation.The topology optimization management algorithm is then used to remove unnecessary material from the machine body,based on the calculated stress distribution in the previous step.The results,achieved after the implementation of the topology optimization study,are shown and discussed.Conclusions about the applicability of the presented approach are made and objectives for its future development and improvement are also defined.