KSHP. OMD №7-2013

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

Strain State of a Blank at Plane Extrusion with Non-coaxial Arrangement of a Punch and a Die.
Part 1. Strain State at Place of Wall Formation

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.

Pankratov D.M., Valiyev A.M., Shibakov R.V.

Analysis of Form Changing of Ring Samples in Conditions of Isotropic and Anisotropic Friction

The article considers peculiarities of form changing of ring samples at upsetting depending on friction conditions on the contact surface of a blank and a die.
Key words: friction; harshness; anisotropy; die; upsetting; forming.

Zhbankov Ya.G., Aliyeva L.I., Mikhalevich V.M.

Recovery of Plasticity at Isothermal Hot Fractional Forming

The method of a blank forming limit calculation in the processes of fractional forming taking into account plasticity recovery in intervals between reductions per die (drafts), duration of such intervals and values of fractional deformation is developed. Results of calculation of process of a blank fractional upsetting with using the method offered are close to experimental results.
Key words: hot forming; plasticity recovery; fractional forming; upsetting; reduction; deformation ratio.

Kruglov A.A., Musina R.Sh., Yenikeyev F.U.

Analysis of Optimum Mode of Superplastic Forming of 3-sheet Structures with Ridged Filler of Titanium Alloys

The article offers a method of analysis of a superplastic forming mode of 3-sheet structures with ridged filler constructed within the frames of basic assumptions of the theory of momentless shells. The method is meant for analysis of pressure time cycle and engineering evaluation of parameters of stress-strain state in the deformation zone.
Key words: superplastic forming; 3-sheet structure; ridged filler; pressure time cycle; stress-strain state.

Zhelezkov O.S., Vinogradov A.G., Malakanov S.A.

Energy Method of Determination of Elastic Springback at Core Blanks Bending

The method of determination of elastic springback arising after completion of bending process is presented. A.A.Ilyushin’s unloading theorem and the energy method are taken as a basis of the method presented.
Key words: bending; elastic springback; energy of deformation; springback angle; finite elements method.

Ayupov T.Kh., Kruk A.T.

Closed Isothermal Stamping with Very Hot Tool Using the Installation «УИГ-700»

The article introduces new technologies of closed stamping of forged products, which are performed using “УИГ-700” gas unit of isothermal forming and which ensure reduction of materials and power consumption and increase forged products quality.
Key words: isothermal stamping; very hot tool; forged product.

Okolovich G.A., Okolovich A.G.

New Manufacturing Technology of Steel Piston Rings

Technology of manufacturing steel piston rings by the method of drawing and thermal treatment is developed. According to the production tests, the service durability of steel rings is 1.5 – 2.0 times higher than that of cast iron rings.
Key words: steel piston rings; drawing; reduction ratio; thermal treatment; recrystallization; thermal stabilization; thermofixation; wearing quality.

Shinkarenko O.M., Korchak Ye.S.

Construction of Strength Diagram of a Crank Machine

The article considers the method of constructing graphs of allowable forces on the sliding ram of a crank machine based on the strength of unsafe cross-sections of the main shaft, the performance of gear pair driving it, and the moment transmitted by the coupling. The article presents the analysis of these graphs and strength diagrams obtained on their basis.
Key words: crank machine; main shaft; coupling; strength diagram; sliding ram.

Kruglov A.A., Samoylova A.Yu., Zagirov T.M., Yenikeyev F.U.

Mathematical and Finite-Elements Simulation of Superplastic Forming of Shell from Round Welded Sheet Stack

The process of superplastic forming of sheet stack consisting of two round sheets welded along the perimeter is considered. A mathematical model including threshold stress as a parameter is offered. Results of calculations by analytic formulae are compared numerical solutions of boundary value problem of viscoplasticity obtained in ANSYS environment.
Key words: superplastic forming; welded sheet stack; boundary value problem; simulation.

Loginov Yu.N., Yershov A.A.

Simulation of the Formation of Funnel at Extrusion in Software Package QFORM

Simulation of the process of central funnel at the final stage of extrusion at variability of the extrusion ratio and the type of material is performed using the software package QFORM. It is revealed that the depth of funnel penetration increases with increase of the extrusion ratio. The greatest depth of funnel penetration occurs when extrusion strengthening material, and the least depth occurs when extrusion weakening material.
Key words: extrusion; resistance to deformation; deformation ratio; hardening curve; funnel; simulation; software package QFORM.