Patterns of thermal behavior of metal-cutting machines

The basic methodological principles relating to the thermal behavior of metal-cutting machines are outlined. Standard formulas for the relative displacement of the shaping tools are presented and analyzed.     

Trends in research on metal-cutting machines

This review covers the current state and prospects for the design of metal-cutting machines, including numerically controlled machines. The characteristics of common mechatronic modules are considered. The structure of metal-cutting machines is outlined, and means of complying with operational requirements are presented.     

Precision and efficiency of metal-cutting machines

Approaches to improving the design of metal-cutting machines are discussed. The most important problems relating to the precision, thermal processes, dynamic modeling, and diagnostics of metal-cutting machines are considered.     

Classification of metal-cutting machines by energy efficiency

Methods of determining the energy efficiency of machine tools are analyzed, including methods based on the input energy balance, the expenditures in machining, and energy losses in the shaping structure of the machine tool. The energy efficiency may be assessed in terms of the energy ratio of the physical processes within the machine tool. On that basis, metal-cutting machines may be classified by energy efficiency.     

Optimal materials for the manufacture of metal-cutting machines

With the goal of improving machine-tool design, attention focuses on the possibility of manufacturing the components of metal-cutting machines from effective new nonmetallic materials that not only meet all the current requirements on such machines but also in most cases improve their performance. The best results are obtained with metal–concrete structures in which the nonmetallic binder consists of modified cement with chemically active additives. Results from materials science are compared with multiyear production tests of metal-cutting machines based on metal–concrete components, which are characterized by stable performance over time. On that basis, an effective new approach is proposed for the modernization of machine tools at the end of their effective working life, without replacing the fundamental structures. The design of the basic structures is analyzed. The production of metal–concrete components in a specialized department of the manufacturing plant is recommended.     

Modal control in the supply drives of metal-cutting machines

Modal control of the transverse supply drive in a numerically controlled lathe is considered. The control method is based on stabilization of the elastic deformation with change in thickness of the cut margin, so as to ensure a constant value within the motor??s armature chain.     

Optimal machining cycles for numerically controlled metal-cutting machines

The design of optimal automatic machining cycles for numerically controlled metal-cutting machines is considered, in theoretical terms. Dynamic programming permits the optimization of an unlimited number of control parameters for all the machining operations in numerically controlled metal-cutting machines.