Models for Machining Accuracy in Multi-Tool Adjustment

Abstract

The article discusses the technology capabilities of multi-purpose CNC machines, and possible options for implementing parallel multi-tool processing. It was revealed that the technological capabilities of these machines are used at best by 50% in factories. This is due to the lack of recommendations for the design and use of such adjustments for these machines. To this end, generalised lattice matrix models of the accuracy of multi-tool machining have been developed in order to fulfill the requirements of algorithmic uniformity models and their structural transparency. The use of lattice matrices greatly simplifies the error in model of multi-tool machining and makes it extremely visual. Also, full-factorial distortion models and scattering fields of the dimensions of multi-tool machining performed on modern multi-purpose CNC lathe machines have been developed to take into account the angular displacements of the workpiece when machining parts with prevailing overall dimensions. They take into account the flexibility of the technological system for all six degrees of freedom to identify the influence degree of complex of technological factors on the machining accuracy (structure of multi-tool adjustment, deformation properties of subsystems of a technological system, cutting conditions). A methodology has been developed for determining the complex characteristics of compliance of a technological system. On the basis of the developed accuracy models in spatial adjustments, it is possible to develop recommendations for the design of adjustments for modern multi-purpose machines in CNC turning group (creation of CAD of multi-tool machining). Thus, it is possible to achieve a number of ways to control multi-tool machining, including improving the structure of multi-tool adjustment, calculating the limiting cutting conditions.

Model of Machining Process Control on Multitool Single-Carriage Adjustments

“…One of the most important factors in improving the productivity of the technological process is the concentration of transitions. The highest efficiency of concentration of transition is ensured by its implementation in multi-tool adjustments [1][2][3][4][5][6]. Dimensional accuracy is a paramount requirement in the design, debugging and implementation of the technological process.…”

“…Dimensional accuracy is a paramount requirement in the design, debugging and implementation of the technological process. In the works of Koshin and Yusubov, the principles were formulated and the foundations of the theory of dimensional accuracy design of multi-tool machining were laid [1][2][3][4][5][6].…”

“…Therefore, of particular interest is the current level of mathematical models for the formation of dimensional errors in single-tool and multi-tool adjustments. [1][2][3][4][5][6][7][8][9][10][11].…”

“…As in the case of single-tool machining [7], for multi-tool single-carriage adjustments, the inverse problem is more relevant: assign the maximum allowable cutting conditions (and possibly other setup parameters) to ensure the highest productivity with a given dimensional accuracy [1].…”

“…In formula (1), Δg is the allowable value of the scattering field. It is due to the requirements for the accuracy of the dimension and is calculated by the formula:…”