Vorontsov A.L.

Description of Deformations at Analysis of Processes of Metals Working by Pressure. Part 2. Revelation of Areas with Different Strained Condition

Problems of determination of deformed state of a blank and regard of strengthening by methods of applicable theory of plasticity are considered. New solutions of tasks of determination of deformed state of the blank in the process of upsetting and indentation into half-space are represented.
Keywords: deformed state, degree of deformation, strengthening, upsetting, indentation into a half-space.

Chukin M.V., Korchunov A.G., Mokhnatkin

A.V. Method of Forecasting of Damage of Steel Blanks at Cold Forming

Methods of analysis of damage of steel blanks in multipass technological processes of cold forming have been developed. The methods are based on application of results of standard mechanical tests and finite-elements simulation of stress-strain state of a processed blank.
Keywords: plasticity resource, multipass process, cold forming, plasticity curve, stress-strain state, forming way, multiple drawing, reinforcement forming

Onishchenko A.K.

Intensive, Megaplastic and Pseudo-Megaplastic (Meso) Deformation

It is shown that each scaled level of plastic deformation at metals processing by pressure corresponds to its own level of grained structure, starting from initial dendritic (mega) structure of an ingot and finishing with nanomicrocrystal (meso [m–n]) structure of a forging achieved by methods of severe plastic deformation. At this relative deformation changes within the range 0 < ? < 1.
Keywords: reduction ratio, mega, meso, nano plastic deformation; nanomicrocrystal structure; severe plastic deformation.

Kochetkov A.V., Gnitko V.B., Yermolayev V.I., Yermolayeva V.V.

Comparison of Bending Processes with Stretching with Forces Control and Displacement Control

Modernization of an analytical solution of the task of bending blanks with stretching on a automatic section-bending machine is offered. Comparison of processes of forming by bending with extrusion with forces and displacement control with consideration of variance of sizes of section-shaped blanks is drawn.
Keywords: bending with stretching, section-bending machine, control system, force, displacement

Sosyonushkin Ye.N., Tret’yukhin V.V., Yanovskaya Ye.A.

Technological Processes of Stamping Products from Thick-Walled Tubes

Specifics of technologies of stamping hollow products from thick-walled tubes by methods of expanding and reduction with thermal intensification facilitating expansion of possibilities of technological processes are considered. The technologies are realized at industrial experimental stamping of adapters and other hollow products from thick-walled tubes.
Keywords: reduction; expanding; thick-walled tubes; thermal intensification.

Shinkarenko O.M., Korchak Ye.S.

Dynamic Stability of Throttle Adjusting Valves of Hydraulic Presses Control Systems

Specifics of operation of throttle adjusting valves of hydraulic presses control systems are considered. Design of an experimental valve and methods of experimental research of its dynamic stability are described. Reasons of dynamic instability of the valve during its operation have been analyzed.
Keywords: adjusting valve, self-oscillations, pressure, dynamic stability, unloading, hydraulic press.

Kanyuokov S.I., Arzamastsev S.V., Konovalov A.V.

Application of Hybrid Approach to Computer Aided Design of Shaft Forging Transitions at Presses

A method of computer-aided design of transitions of forging stepped shafts at presses with application of hybrid approach is described. The method is based on evaluation of the similarity criterion of forget product from the database.
Keywords: CAD system of technological process of forging; stepped shafts; forget product; transitions of forging; hybrid systems, similarity criterion.

Panin V.G.

Lubricant for Hot Forming of Tubes of Alumina Alloys

Shortcomings of lubricants applied at extrusion tubes from alumina alloys on a movable mandrel have been analyzed. A new technological lubricant allowing prevention of metal pick-up, raising quality of products and tool wear resistance has been developed and introduced at Company "Алкоа-СМЗ”.
Keywords: technological lubricant, hot extrusion, movable mandrel, anti-friction properties.

Levanov A.N.

Methods of Tests for Contact Friction in Processes of Metals Working by Pressure

Feasibility demonstration and description of a simple method of tests for contact friction in processes of metals working by pressure are presented. The method is suitable for use in a factory laboratory and allows getting reliable experimental data for technological analysis of processes of specific materials processing.
Keywords: contact surface, frictional stress, normal stress, friction ratio, self-centering container, die.