Numerical studies to determine spatial deviations of a workpiece that occur when machining on CNC machines

Abstract

Abstract. The article discusses the problem of increasing the accuracy of machining workpieces on machines with computer numerical control. Within the framework of the problem identified, the role of the finite element method for solving it is considered. Moreover, numerical simulation is primarily used for receiving estimates of operational and technological characteristics of the developed product, and in the present work we propose to use a method of the finite element analysis as a tool for ensuring the accuracy of shaping the surface of a workpiece in process systems for determining the deformation of the workpiece under the action of cutting forces and transformation of its geometric shape prior to direct machining based on identified deviations. That is, the possibility of applying the finite element method in the development of control programs for details such as bodies of revolution is considered.

The Processing of the Profile Surface of the Work-Pieces, Characterized by Low Rigidity

“…When profile milling of peripheral segments per one working pass of the cutting tool the allowance with thickness measured in tens of millimeters is removed, which causes a decrease in static and centrifugal moments of the cross section inertia of the original piece, the moment of resistance, and, consequently, rigidity and geometric accuracy of the machined surface. An important resource for improving the quality of products is the use of high-tech complex systems [51][52][53][54][55], as well as high-performance automated machines and computer systems [56][57][58][59][60][61]. Nowadays, there are no mathematical models of elastic displacements and flexural rigidity of extended workpieces with unstable dimensional, physical and mechanical characteristics [62][63][64][65], which makes it impossible to carry out design calculations and to obtain reliable results, on the basis of which it would be possible to develop effective milling processes for profile surfaces.…”