Vorontsov A.L., Karpov S.M., Stupnikov V.P.

Strain State of a Blank at Plane Extrusion With Non-coaxial Arrangement of Punch and Die.
Part 2. Strain at the Sub-endface Area of the Punch

Solution of the task of determination of strain state of a blank at plane extrusion of U-shaped carriers with non-coaxial arrangement of a punch and a die is presented.
Key words: extrusion; non-coaxial arrangement of a punch and a die; plane strain state; cumulative deformations; strengthening.

Zhbankov Ya.G., Markov O.E., Sivak R.I.

Determination of Rational Parameters of Profiled Preforms, which are subject to Upsetting with the Use of Flat Plates

Research on processes of upsetting cylindrical preforms with tapered ledges and cylindrical preforms with cylindrical ledges using flat plates. The research established that a clamp can appear in the upsetting process of cylindrical preforms with cylindrical ledges. Determined rational parameters of a preform with tapered ledges, which in the process of upsetting provide the admitted uniformity of strain distribution and a favorable scheme of the stress state.
Keywords: upsetting; profiled preform; flat plates; tapered and cylindrical ledges; strain distribution.

Ogorodnikov V.A., Dereven'ko I.A.

Phenomenological Basis of Ultimate Form Changing Evaluation of Preforms at Cold Forming

Development of a method allowing the estimation of ultimate form changing of preforms at cold forming considering various factors affecting the plasticity of preforms.
Keywords: stress-strain state; cold forming; extrusion; plasticity resource; deforming path.

Shestakov N.A., Subich V.N., Shukshin A.V.

Fine-grain Structured 3D Preforms Production Technology

Development of a new multistep extrusion technology applying wedge punches, which allows the production of preforms with the fine-grained structure. The results of simulation and experimental researches on the new technology corroborated it's advantages as against the recognized methods of severe plastic deformation.
Keywords: multistep extrusion; wedge punches; simulation; degree of strain; uneven strain distribution.

Pankratov D.M., Ziganshin R.F., Shibakov R.V., Shibakov V.G.

Production of Light-weight Parts out of Hollow Preforms Manufactured with the Use of Piercing

A probability of using the open piercing for the production of hollow preforms that are subject to further treatment with forging, stamping and cross-wedge rolling processes is studied.
Keywords: metal saving; hollow preforms; open piercing.

Malygin V.I., Cherepenin F.V., Skovpen S.M., Lobanov N.V.

СТГ-3A Pipe-Bending Machine Modernization

Presentation on the results of control system modernization for the СТГ-3A pipe-bending machine. Certain features of compiling a management program and practicing the automatic pipe bending technology on the modernized machine are studied. The modernization efficiency is demonstrated.
Keywords: pipe-bending machine; modernization; digital readout and control equipment; management program; automatic pipe bending.

Shibakov V.G., Mulyukov R.I., Vil'danov I.Z.

Development of a Technological Design Model of a Part in CAD Systems for Metal Working by Pressure Technological Processes

Proposing the designing of a geometric analyzing device as a linking element for an integrated production system using the method of metal working by pressure. Such device is suggested to be preparing the data necessary for CAD system for technological processes.
Keywords: electronic product model; geometric analyzing device; technological design model; technological processes CAD system.

Fomichyov A.F., Romanov A.V.

Using Computer Simulation to Estimate Fracture Probability of a Preform and a Tool

Case study on the application of computer simulation for determination of a preform cumulative degree of strain at bulk stamping, selection of optimum preform dimensions and also for estimation of a bending die fracture probability and optimization of its design.
Keywords: computer simulation; stress; cumulative degree of strain; bending die; bulk stamping.

Grushko A.V.

Using Hardness Test Method for Researching Dynamic Cold Hardening of Materials

Presentation of an experimental calculating method of determination of parameters considering high-speed material hardening at cold forming. The method is based on standard Brinell (HB) and Leeb (HL) hardness tests.
Keywords: cold forming; materials hardening; materials flow curves; Brinell hardness; Leeb hardness.

Gliner R.E., Katyukhin E.B.

Use of a Self-adhesive Measuring Grid for Researching the Regularities in Sheet Metal Forming Process with Considerable Metal Thinning

Case study on the application of a self-adhesive measuring grid for examination of sheet preforms strain characteristics at the process of cold rolling-off with thinning. The study identified both similarities and differences in the regularities of the current process and the process of strip rolling. A computing method of strain degree determination with the use of a measuring grid is developed.
Keywords: rolling-off; rolling; principal strain; self-adhesive measuring grid; thinning.