Open AccessMETHOD FOR CALCULATING CUTTING FORCES BY MODELING CAD WITH A SYSTEM OF GEOMETRIC CUTTING PARAMETERS WITH RADIAL MILLS
Author(s) -
А. И. Лещенко
Publication year - 2021
Publication title -
vìsnik kiïvsʹkogo polìtehnìčnogo ìnstitutu. serìâ priladobuduvannâ/vìsnik kiïvsʹkogo polìtehnìčnogo ìnstitutu. serìâ priladobuduvannâ
Language(s) - English
Resource type - Journals
eISSN - 2663-3450
pISSN - 0321-2211
DOI - 10.20535/1970.62(2).2021.249130
Subject(s) - generatrix , process (computing) , machining , trajectory , mechanical engineering , intersection (aeronautics) , milling cutter , enhanced data rates for gsm evolution , cad , computer science , software , engineering drawing , engineering , geometry , mathematics , physics , astronomy , programming language , aerospace engineering , operating system , telecommunications
The accuracy of processing surfaces of a complex profile largely depends on the selected processing strategy, which will allow creating the same, within certain limits, power characteristics of the shaping process at the intervals of the programmed tool path. In this case, it becomes possible to include tuning modules in programs for CNC machines that form vector values of corrections in certain areas, as reactors for elastic deformations of the cutting process. Therefore, it is especially important to know the modulus and direction of the resulting cutting force vector, which does not necessarily coincide with the feed direction.
The purpose of this work is to build a method for calculating cutting forces by modeling the geometric parameters of a cut with a CAD system, a cutter with a nonlinear generatrix. Solid modeling of the process is based on the Boolean operations of "intersection" and "subtraction" of 3D objects: the teeth of a radius cutter with a helical cutting edge and a workpiece "moving" at a feed rate. The tool for the implementation of this method is a software module created on the basis of API functions, the input data for which are: a 3D tool and a workpiece, the equation of the trajectory of its movement and the parameters of the infeed movement. Targeting API properties, the application makes it possible to simulate various trajectories, helical or trochoidal, when machining complex surfaces. In the future, it is possible to take into account the plastic deformation processes in the chip formation zone in the model by connecting external modules.
In the course of the conducted research on milling with radial end mills with a helical cutting edge, when two or more teeth are within the arc of contact, it was determined by 3D modeling how much thickness and width the layer cuts off each of the teeth during the feed per revolution. Consequently, in the process of shaping, normal and tangential cutting forces, which are different in direction and modulus, are present as a function of the angle of rotation of the cutter. Therefore, the concept of "circumferential force on the cutter", accepted in the theory of cutting, as a certain constant component of the process, can introduce an error when considering the causes of the excitation mechanism of vibrations of different nature that arise in the processing zone.