F. V. Grechnikov, V. K. Moiseev, O. V. Lomovskoy, A. A. Sharov (Samara University, Samara); M. N. Mantusov (Ulyanovsk branch of PJSC «TUPOLEV», Ulyanovsk)

Stamping with tangential compression of high-precision sheet metal parts

Analytical and experimental studies of the process of stamping-bending sheet parts with elastomer with tangential compression of the material of the beads in the deformation zone were carried out. Confirmed the adequacy of the mathematical model of the process. Recommendations on the use of the model in the design of stamping technology are given.
Keywords: aircraft production technology; elastomer stamping; constrained bend; voltage; deformations; pressure.

S. V. Samusev, V. А. Fadeev (National Research Technological University «MISiS», Moscow)

Theoretical study of the process of continuous molding of tubular billet in various layouts of the molding mill TESA with a falling trajectory of the center of folding

The theoretical results of the deformed state of the tube billet for a 50?1,5 mm pipe for a falling folding center are presented. Longitudinal deformations are determined by the width of the workpiece. For various folding centers, characterized by a rise in the initial position of the strip and a length of the falling center of folding, the deformation state of the strip is determined.
Keywords: continuous molding; drop forming path; TESA; molding mill; electric pipe; roll forming; modeling; roll tool.

B. N. Mar’yn, Phone Htet Kyaw, I. N. Ivanov, E. A. Startsev, P. V. Bakhmatov (Komsomolsk-on-Amur State Technical University, Komsomolsk-on-Amur).

Ensure accuracy and reliability of the stamped and welded elements of pipeline systems of the aircraft

In addition to piping operating loads (pressure, vibration, temperature, etc.) face additional burden due to the mounting stresses. Mounting stresses occur in the result of derivatives of deviations from the norms of manufacturing precision parts and precision location of the locations (from the deformation of the structure).The mounting tension arising from the installation of pipes to the product is characterized by production deviations in the length in the area mates with the fitting and the eccentricity between the axes of the pipe and fitting.
To reduce mounting stresses in detachable and non-detachable connections mounting of workpieces depending on the stiffness characteristics should be considered compensation the capabilities of both the pipe and joints pipe ends. In this work defines a group of precision for the manufacture of parts of pipelines with detachable and permanent connections. Reviewed schematics to check the strength and tightness of mounting workpieces.
Researches have shown that each group has a specific accuracy requirements to pipelines during their manufacture and installation.
Keywords: the mounting of the workpieces; detachable and permanent connection; the mounting tension; strength; tightness.

V. V. Marshirov, L. E Marshirova (National Research University Higher School of Economics, Nizhny Novgorod); I. V. Marshirov (Polzunov Altai State Technical University, Barnaul)

Digital technologies for displaying, recording and high-precision temperature control for metal forming

An algorithm for flexible and high-precision control of heating devices is described. Created software that provides simultaneous display and recording of temperatures using eight thermocouples and highly accurate temperature control of four heating devices.
Keywords: heating and heating devices; digital technologies; precision control algorithm.

G. L. Kolmogorov, T. E. Melnikova (Perm National Research Polytechnic University (PNRPU), PERM’)

Hydrodynamic effect of technological lubricant during sheet stamping

Regularities of technological lubricant current are considered, which provide the possibility of achieving a hydrodynamic mode of friction during sheet stamping. two stages of the stamping process are investigated, at which the metal detail is pressed and the deep drawing is directly drawn. solving the reynolds differential equations for the lubricant layer scheme at each stage of the process allowed us to obtain ratios determining the required thickness of the lubricant layer to ensure the hydrodynamic effect of the lubricant during sheet stamping. analytical dependences are presented, which allow to calculate the parameters of the deep-drawing process in such a way as to ensure the necessary lubricant pressure in the deformation zone and the optimal power parameters of the deformation. the obtained relationships can be used in technological calculations for choosing rational parameters of the sheet punching process, especially when deep drawing hard-to-deform metals and alloys.
Keywords: sheet stamping; lubricant; hydrodynamic effect of lubricant; frictional conditions; deformation; forming processes; deep drawing.

L. B. Aksenov (Peter the Great St. Petersburg Polytechnic University, Saint Petersburg)

Probabilistic assessment of the accuracy of forgings stamped on crank hot forging presses

The article shows that the technological parameters of the stamping and the height of the stamped forgings are random variables subordinate to the normal distribution law. To determine the degree of influence of technological parameters and the rigidity of the technological process on the accuracy of forgings, computer simulation is used. A method for determining the height dispersion parameters for three types of forgings with different geometries is given.
Keywords: hot stamping; crank presses; accuracy of forgings; computer modelling; rigidity of the forging; probability.

Yu. N. Loginov (The Ural Federal University named after the first President of Russia B. N. Yeltsin, Institute of Physics of Metals named after M. N. Mikheev Ural Branch of the Russian Academy of Sciences, Ekateriburg), B. I. Kamenetsky (Institute of Physics of Metals named after M.N. Mikheev Ural Branch of the Russian Academy of Sciences, Ekateriburg), Yu. V. Zamaraeva (The Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekateriburg)

Interlayed interaction in the upsetting of the bimetallic billets

The results of the simulation by the finite element method are presented in the ABAQUS and DEFORM-2D software modules of bimetallic and monometallic billet upsetting. The conclusion is made about the possibility of cavities at the boundary of the layers. The presence of cavities leads to the impossibility of maintaining the pressure backwater. As a result, the use of the shell to increase the plasticity of the metal becomes ineffective.
Keywords: bimetal; plastic deformation; upsetting; stress; deformation; magnesium; finite element method; crack formation.