OPRACOWANIE ALGORYTMU MODELOWANIA FORMOWANIA PŁASKICH ELEMENTÓW

Problems of creating of the algorithm and software for the simulation of some metal forming processes are considered. The results obtained in the simulation of the flow pattern of metal for processes of forging and stamping flat workpieces are represented.Rozpatrzono problem opracowania algorytmu i oprogramowania dla modelowania pewnych procesów obróbki metali pod ciśnieniem. Przedstawiono wyniki otrzymane przy modelowaniu przepływu metali w procesach kucia i wybijania płaskich detali

WYKORZYSTANIE PAKIETU OPROGRAMOWANIA «DEFORM 2D/3D» DO PRACY NAUKOWEJ PRZY OPRACOWANIU NOWYCH INNOWACYJNYCH TECHNOLOGII

This article provides information about the software package DEFORM 2D/3D, used for the simulation of metal forming processes. Describes the various models developed by this program.Artykuł zawiera informacje o pakiecie oprogramowania DEFORM 2D/3D wykorzystywanego do modelowania procesów obróbki ciśnieniowej metali. Opisano realizacje modeli opracowanych z pomocą tego pakietu

New Combined Technology of Deformation “Rolling-Equal Channel Angular Pressing”, Allowing to Obtain Metals and Alloys with Sub-Ultra-fine-Grained Structure

In this chapter, results of theoretical and laboratory research of combined process “rolling-pressing” using equal-channel step matrix are described. In theoretical studies, the empirical dependences for determining forces of rolling, extrusion, and back pressure in the matrix have been obtained. A program was compiled for finding the optimal value of the angle of intersection of channels in the matrix. In the study of kinematic parameters of the process were obtained formulas for determining diameters of the rolls, the values of which would provide the best capture angle of the workpiece. During computer simulation, the parameters of stress-strain state, temperature distribution, and the influence of the tilting of the workpiece on the process parameters were studied. In the laboratory experiment, the effect of the new combined deformation process “rolling-pressing” on the evolution of microstructure of copper was studied

Theoretical Study of the Force Parameters of the ECAP-Linex Combined Process

The paper presents theoretical studies of a new deformation process combining the stages of equal-channel angular pressing (ECAP) and the Linex scheme. To analyse the resulting deformation forces, the stages of pressing in a matrix and compression by a chain conveyor are separately considered. Equations were provided for determining the forces acting on the drive pulley, ECA matrix, and chain element link. A trial calculation and comparative analysis with the previously known rolling-ECAP process showed that the new ECAP-Linex process allows for a stable deformation process with lower forces and a smaller channel junction angle in the matrix. The values obtained by equations are verified with computer simulation using the finite element method in the Deform program. A comparison of values showed that the force values in the calculation and simulation have a high level of convergence. For all three considered parameters, the difference value did not exceed 3%

Realization of the innovative potential of radial-shear rolling for forming the structure and mechanical properties of AISI-321 austenitic stainless steel

In this paper the grain structure and mechanical properties of AISI-321 austenitic stainless steel subjected to 7 passes of radial-shear rolling at 1000 °С were investigated. The tensile strength (1076 MPa) and Vickers microhardness (322 HV) after 7 passes increased by 2.2 times and 2 times, respectively, relative to the initial annealed state (480 MPa, 160 HV). Ultra-fine grained structure (200-700 nm) formed in the bar section area from its surface to a depth of 0.25 of the radius. The transition zone is located in the area between 0.5 R and 0.25 R of the bar section. Anything deeper is a rolling texture. The 7-pass radial-shear rolling process is an effective way to form UFG structure and improved mechanical properties in AISI-321 austenitic stainless steel.Keywords: severe plastic deformation, ultra-fine grained structure, radial-shear rolling, microstructure, mechanical properties.

Theoretical Study of the Force Parameters of the ECAP-Linex Combined Process

The paper presents theoretical studies of a new deformation process combining the stages of equal-channel angular pressing (ECAP) and the Linex scheme. To analyse the resulting deformation forces, the stages of pressing in a matrix and compression by a chain conveyor are separately considered. Equations were provided for determining the forces acting on the drive pulley, ECA matrix, and chain element link. A trial calculation and comparative analysis with the previously known rolling-ECAP process showed that the new ECAP-Linex process allows for a stable deformation process with lower forces and a smaller channel junction angle in the matrix. The values obtained by equations are verified with computer simulation using the finite element method in the Deform program. A comparison of values showed that the force values in the calculation and simulation have a high level of convergence. For all three considered parameters, the difference value did not exceed 3%

Study of Deformation of Aluminium Alloy in Equal Channel Angular Matrix with Quasi-small Channels Intersection Angle

This article is described the various possible schemes of severe plastic deformation, by ECAP process that allows receiving metal with ultrafine-grained structure. The results of computer simulation and TEM investigations of aluminium alloy 6060 were presented. It is shown that the equal-channel angular pressing in the proposed matrix with a quasi-starched channel joint angle 45° provides the formation of a homogeneous subgrain structure with a size about 0.5 µm and has a positive effect on the mechanical properties of the aluminium alloy

Simulation of the combined process “helical rolling-pressing” in the software package Simufact. Forming

This work is devoted to the simulation of new energy-saving combined process "helical rolling-pressing" in program Simufact Forming. During the simulation were studied the main parameters of stress-strain state and microstructure. The variation of the main technological parameters showed that the influence of the heating temperature of the workpiece plays a significant role in the degree of grain grinding. While the speed of deformation, allowed by the mill design limits, has no significant effect on the microstructure