Selection of metal-cutting machines in operational design by means of PLM systems

© 2017, Allerton Press, Inc.A method is proposed for the selection of metal-cutting machines in the design of technological operations using Teamcenter and UNIGRAPHICS NX software

Technological inheritance in the machining of titanium alloys

© 2017, Allerton Press, Inc.The surface quality and fatigue strength of structural titanium alloys are analyzed. Attention focuses on the work hardening, residual stress, fatigue strength, and the hydrogenation after machining in various conditions

ЭКСПЛУАТАЦИЯ НАКОПИТЕЛЯ ЭНЕРГИИ НА МЕТРОПОЛИТЕНЕ

The article refers to stages of implementation of regenerative braking system at Moscow metro. The authors publish the results of experimental measuring of operation rates of the system of traction power supply and of stationary power storage device. The article describes installation process of storage device at the traction substation and its test operation. The monitoring confirmed high correlation of the rates of operation regime with previously calculated data.Рассмотрены этапы ввода рекуперативного торможения на Московском метрополитене. Даны результаты экспериментальных замеров показателей работы системы тягового электроснабжения и стационарного накопителя энергии. Описаны установка накопления энергии на тяговой подстанции и ее опытная эксплуатация. В ходе наблюдений подтверждена высокая корреляция показателей штатного режима с расчетными данными.

Identifying the primary rigidity axes in the elastic system of a metal-cutting machine

© 2016, Allerton Press, Inc.A computer experiment based on CAE systems may be used to determine the primary rigidity axes in the supporting systems of metal-cutting machines. The formulation of the models, the experimental method, and the applicability of the method are considered

Relation between the tool database and the CAM system in designing operations on a numerically controlled machine tool

© 2017, Allerton Press, Inc. A method is proposed for formulating a tool database with reference to the machine tools and recommended operating conditions at a specific plant. The database may be used to program machining operations in a CAM system

Errors in shaping by a planetary mechanism

© 2017, Allerton Press, Inc. The proposed planetary reaming method permits discontinuous turning in which the cutting edge moves relative to the cutting surfaces. As a result, individual sections of the cutting zone move successfully in and out of the machining zone. Discontinuous turning is free of the deficiencies of continuous turning

Trochoidal slot milling

© 2017, Allerton Press, Inc. Parameter specification in the trochoidal machining of a slot of constant width is considered. A formula is proposed for the displacement increment of the shaping circle as a function of the cutting depth

Composites with improved absorption of noise and vibration

© 2017, Allerton Press, Inc. The development of composites based on thermosetting resins with improved vibration and noise absorption is considered. Mathematical and topological models are proposed to describe the influence of the composition on the vibration and noise absorption and elastic properties of the composites. The composition of filled epoxy, polyester, and polyurethane vibration-absorbing composites is optimized in terms of their loading, dynamic, and economic characteristics

Precision of surfaces machined on a lathe with geometric errors

© 2017, Allerton Press, Inc.The precision attained in the shape and mutual position of cylindrical surfaces after machining may be assessed by means of a mathematical model. The effectiveness of the model is confirmed in practice