KSHP. OMD №9-2018

A. L. Vorontsov, D. A. Tyalina (The Bauman Moscow State Technical University, Moscow)

The study of combined extrusion of sleeves with the conical bottom.
Part 1. The relevance of research

The urgency of carrying out of research with the purpose of definition of the basic technological parameters of process of combined extrusion of sleeves with the conical bottom, necessary for successful designing of this operation is proved.
Keywords: volumetric stamping; metal sleeve with conical bottom; combined extrusion.

A. E. Tsibulko, E. A. Romanenko (PJSC «NKZM», Kramatorsk, Ukraine)

A unified natural theory of strength and fracture of materials in brittle and viscous states under complex loading

A unified natural theory of the strength and fracture of materials in brittle and viscous states under complex loading is proposed, based on the dependence of the destructive factors: normal and tangential stresses on the specific potential energy of deformation.
Keywords: strength; normal and tangential stresses; deformation; potential energy; separation; shift.

V. N. Samohvalov, Zh. V. Samohvalova (Samara State Aerospace University (National Research University) named after academician S. P. Korolyov, Samara)

Experimental research and modeling of the pressing process of clamps of multiwire conductors from dissimilar materials by the pressure of a pulsed magnetic field

The results of the investigation of the processes of crimping tubular connectors on multiwire monometallic, bimetallic and combined wires with the pressure of a pulsed magnetic field are presented. Optimum regimes of force magnetic-pulse action are determined, which ensure high quality of the press connection. Specific features of deformation in obtaining connections from various materials of connecting bushings and wires are established.
Keywords: magnetic-pulse processing of metals; pressing of joints; stranded wires; numerical modeling; experiment.

A. I. Selishchev (JSC «KLAB named after L. N. Koshkin», Podolsk; СJSC «Prochnost», Moscow), AV Kornilova, Dr. Tech. Sciences (The Peoples’ Friendship University of Russia, Moscow; СJSC «Prochnost», Moscow)

Development of a method for determining the resource of hot stamping die stamps in terms of the coercive force

The results of the development of the method for determining the resource of hot stamping die stamps based on measurements of the coercive force of the tool material are presented. Various versions of the methods for determining the resistance in terms of the coercive force, temperature and stresses based on the developed method are given.
Keywords: magnetic control; coercive force; hot pressing; die.

E. Yu. Raskatov, Yu. S. Semichev; I. A. Surkov («NADEZHNOST' TM» LLC, Moscow)

Conducting periodic examination of the state of basic parts of powerful hydraulic presses is the basis for ensuring their long-term trouble-free operation

The relevance of modern conducting examination is confirmed by the studied mechanism of a large number of destructions of the basic details causing the economic damage considerably exceeding expenses on examination of a condition of the equipment, development and deployment of technical solutions according to prevention of emergencies.
Keywords: hydraulic press; basic components; unlimited durability; functional wear (obsolescence); physical wear; fatigue limit; sudden destruction.

Yu. N. Loginov, E. G. Polishchuk (The Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekateriburg); A. S. Ovchinnikov (JSC «Revda non-ferrous metal processing works», Revda)

Stress-strain of brass extrusion under variable heat transfer conditions

In the industrial experiment, the heating range from the heat of the ingots of the tooling used for pressing brass was determined. Two variants of tool operation were revealed: with a clean surface and metal adhering to it, the possible values of transmission factors for these two processing cases were determined. With the help of computer simulation, it was established that when the heat transfer coefficients change by approximately one order of magnitude, no noticeable changes in the distribution of the strain in the finished product are observed. However, a possible change in the field of strain rates and temperatures has been revealed, which may affect the passage of phase transitions in multiphase brasses.
Keywords: extrusion; heat transfer; metal adhering to the tool; brass; finite element method; stresses; strains.

V. Yu. Sholom; A. N. Abramov; D. G. Tyulenev; А. V. Sholom (USATU, Ufa)

Formation of copper coating in the process of plastic deformation in the presence of lubricants

Provides research on formation on the surface of the deformed billet copper coating due to leakage of tribochemical reactions in the presence of external lubrication Wednesday. Researched the chemical composition and thickness of coating.
Keywords: friction; plastic deformation; tribochemical reactions; copper coating; the surface layer.