IMPROVING THE MANUFACTURABILITY OF THE CARRIAGE OF A TURNING AND SCREW-CUTTING MACHINE WHILE ENSURING THE STABLE SPATIAL POSITION OF THE REVERSAL HEAD

The phenomenon of spatial reorientation of the machine reversal head is considered, which introduces additional errors in the machining accuracy. The study objective is to evaluate the influence of some design features of a turning and screw-cutting machine carriage on its torsional stiffness while ensuring stable spatial position of the reversal head. A number of field experiments are carried out on turning machines of 16B16F3 and SAMAT-400SC "Vector" models, as well as numerical simulation of the stress-strain state of the reversal head carriage. Numerical experiments using QE modeling in ANSYS environment for three carriage design options: a basic design, a design with no stiffeners, and a design with no stiffeners and heel. The result analysis shows that the removal of stiffeners and heels from the basic carriage design in order to improve manufacturability leads to a slight decrease in the torsional stiffness of the carriage bridge and, as a result, to an increase in the error of reorientation of the reversal head. However, compared to the basic carriage design, this reduction is insignificant and the proposed improvement in the manufacturability of the carriage, while excluding stiffeners and heels from the design, can be implemented.