Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Finite Element Method Applied to Model the Structural Stiffness Behavior of a Machine Tool
Submission Author:
Tedni de Abreu Goulart , SP
Co-Authors:
Tedni de Abreu Goulart, jefferson de oliveira gomes, Ronnie Rego
Presenter: Tedni de Abreu Goulart
doi://10.26678/ABCM.COBEM2021.COB2021-1274
Abstract
The current trends of the global industry have demanded parts with more complex geometrical shapes which also demand more accurate machine tools. However, many error sources can influence the machine’s accuracy; among those, the static and dynamic loads are defined as the most relevant. These loads act on the machine’s structure causing deflections which directly affect its behavior. The objective of this study is to understand how the accuracy of a machine tool is influenced by its structural stiffness behavior. To achieve this objective, the structural stiffness of each translational machine axis was mapped in the entire machine’s work volume. This investigation used a finite element model to map the directional stiffness of the axes. All the investigation procedure was executed in a ROMI DCM 620 5X five-axis machining center. With the results of the finite element model, was established a structural stiffness map for any point of the machine’s work volume. The resultant map was analyzed considering the machine tool structure. The correlation between machine tool structure and the stiffness map can be proof and different machining strategies can be derived based on this correlation. The developed procedure is a robust method to understand the structural behavior of a machine tool and which, due to the process loads, must be considered in order to provide components with demanded geometrical accuracy.
Keywords
Machine tools, Machining process, accuracy, Structural stiffness
