Abstract
Nowadays, the design trajectories of the executive elements CNC-machines are successfully controlled by computer simulation. But the quality and efficiency of the cutting process cannot be achieved by ensuring the accuracy of movement trajectories of the executive elements. Experimental experience of the rational process modes, tools, cooling and lubricating liquids and etc. was laid in the basis for designing the CNC-program to ensure the equivalent quality of processing. This experience reflects some averaging over a variety of machines, tools and processing conditions. In this case, the changes in the cutting system properties along the motion paths are not taken into account. These changes can be set a priori as changes occurred as a result of the energy released in the cutting zone and then supplied to the machine systems. The article deals with the synergetic alignment of the external (CNC-program) and internal control (dynamic of the cutting process). This paper presents a new approach to the mathematical simulation of a controlled dynamic cutting system, which properties change due to the a priori established laws of parameter changes of interacting subsystems, as well as due to the result of cutting forces acting in the interface of the tool and machining zone. It is revealed that the CNC program with the changing process properties matches regularly that makes it possible to increase the economic efficiency of processing while ensuring the required quality of the batch production of parts.
Highlights
A system-synergetic paradigm of analysis and synthesis has been formed [1]-[2]
The knowledge based on various ideas concerning the influence of process parameters on the machining process [11]-[14] are used for determining the CNC-programs and for setting the trajectories of the executive elements (TEE)
The introduced system of equations reveals the link of the forces F with deformation displacements Eq (4), in which it is necessary to express the forces through coordinates of the state and TEE are related to the process modes
Summary
A system-synergetic paradigm of analysis and synthesis has been formed [1]-[2]. It is shown that the control of elastic deformations of the tool and the workpiece is one of the effective quality control methods for parts manufacturing [18] This method was recognized in cases that the rigidity of the processed part changes along with the TEE of the machine [19]-[21]. The algorithm of alignment control included the determination of the evolutionary trajectory of the system properties and provision of its asymptotic stability while minimizing the intensity of tool wear is proposed based on the study of the influence of the cutting system parameters on the output characteristics of the cutting process. The materials given in the article are devoted to the alignment of the CNC-program with the properties of the cutting DS that change along the tool path
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