Features of Design and Practical Application of Digital Twin of Internal Grinding Operation with CNC

The emergence of modern CNC machines, which allow performing processing on specified cycles, revealed the problem of lack of effective design tools for optimal cycles of mode parameters control. To solve the problem, a system for designing optimal control cycles of mode parameters is proposed. This system includes digital models of accuracy limitations, roughness, etc., mathematical optimization too—dynamic programming method, method of optimal cycle designing, digital twin internal grinding, including a model of allowance removal and force model of the process. A digital twin of internal grinding operation essentially describes the process of the treated surface forming during the whole hole length throughout the cycle, considering initial technological conditions, features of metal removal in reverse and non-reverse zones, and unsteadiness of the processing. The article presents the features of digital twin designing for internal grinding. In addition to the optimization system, DT of internal grinding can be used for predicting the processing accuracy, identifying possible processing problems, verifying reliability of the designed cycles for the CNC machine under unstable processing conditions of batch parts, etc.