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Development of a computational model of a lightweight vertical lathe with the use of superelements

100%

Powałka B. , Dolata M.

Archives of Mechanical Technology and Materials

2019

tom Vol. 39

1--6

This article presents a process of developing a computational model of a light construction vertical lathe. The model is made using the finite elements method. Due to the complexity of the machine tool and the optimization of the computation time superelements have been used in the model. The application of this method has reduced the computation time allowing the analysis of many variants of the mutual position of the machine components. The results of the analyzes led to the indication of weak links of the machine tool. After the improvement of the machine tool construction the movement of the tool tip and the workpiece was much smaller.

Orthotropic model of rolling bearing in modeling lathe spindle dynamics

80%

Tomaszewski J. , Dunaj P. , Powałka B. , Jasiewicz M.

tom Vol. 60 nr 1

17--31

This paper presents a method for simplified modeling of bearing nodes of a lathe spindle using the finite element method. The proposed modeling methodology is based on the use of an orthotropic material model, which is used to reflect the stiffness properties of the bearing, both in the radial and axial directions. The modeling results have been experimentally verified. This resulted in full agreement of the mode shapes, an average relative error of the natural frequency values of 1.48% and high agreement of the receptance function.