In this study the process of burnishing rolling is considered as a geometrical and physical boundary initial value problem, with unknown conditions in contact area. 3D dynamic explicit method for taking into account surface after turning (as previous treatment) under ANSYS/LS-DYNA environment was established. The analysis covered surfaces characterized by vertical angles asperities range: 60°÷150°. simulation results (i.e. deformation, states strain stresses, depth stress deposition) were...

This work presents experimental studies with numerical modeling, aiming at the development of guidelines for shaping aluminum alloy AA6111-T4, t = 1.5 mm thick, use a shear-slitting operation. During tests, parametric analyses were conducted selected material thickness. For purposes deformation’s analysis, vision system based on digital image correlation (DiC) method was used. Numerical models developed finite element analysis (FEA) and mesh-free method: smoothed particle hydrodynamics...

This work describes the thread rolling as a real object and its physical mathematical modelling. An incremental modelling numerical solution of contact problem between movable elastic or rigid tool elastic/visco-plastic bodies developed in [ is adopted to simulation process for case (threading head) body (pipe bar). update Lagrangian formulation was used describe nonlinear phenomena on typical step. For discrete equations motions deformations explicit integration method applied. The...

The shearing process such as the blanking of sheet metals has been used often to prepare workpieces for subsequent forming operations. use FEM simulation is increasing investigation and optimizing process. In current literature a simulations limited capability large computational cost three dimensional (3D) analysis largely two (2D) plane axis-symmetry problems. However, significant progress in modelling which takes into account influence real material (e.g. microstructure material),...

Magnetic materials are produced in large rolls that need to be cut specific dimensions make final products. The high residual stresses, sheet deformation and burr formation at surface during the cutting process leads deterioration of magnetic properties this materials. paper focuses on numerical experimental analysis guillotining using FEM. In computer models dynamic effects, mechanical coupling, constitutive damage law contact friction taken into account. effect main parameters force...

Generally advantages of superficial plastic processes are well-known (smooth, strain hardening surface, the low unite price and large repeatability product quality), but industrial application it procures many difficulties. The lack suitable methods preparation unequivocally guidelines concerning on preparations surface under processing data about choice technological parameters basic problems. In aim enlargement product's quality not only burnished accuracy, also accuracy regular...

The increase of requirements concerning the accuracy numerical analysis technological processes with nonlinear contact such as drawing, cutting, embossing, burnishing rolling, thread rolling and machine cutting involves extension in determining workability parameters: initial yield stress σ Y0 , plastic hardening modulus E T true failure strain φ f . Currently, those parameters are often determined uniaxial tensile testing. Determination states after exceedance ultimate strength material,...

Paper presents the modelling of contact problem in technological processes. Technological processes were considered as a geometrical and physical boundary initial value problem, with unknown conditions zone. An incremental model between movable rigid or elastic body (tool) elastic/visco-plastic (object) updated Lagrange formulation, for spatial states (3D) was considered. The functional total energy variational, non-linear equation motion deformation object on typical step time derived. This...

The article presents the results of computer modelling and numerical simulations deformation stresses occurring in surface layer product after burnishing cold rolling operation. Technological processes were considered as a geometrical physical boundary initial value problem, with unknown conditions contact zone. An incremental model problem between movable rigid or elastic body (tool) elastic/visco-plastic (object) updated Lagrange formulation, for spatial states (3D) was considered....

This article concerns the application of FEM method for prediction stress and deformation states in workpiece during diamond sliding burnishing (DSB). An updated Lagrange (UL) description was used to describe phenomena at a typical incremental step. The strain rate are described by non-linear relationships without linearization. material parameters were estimated tensile tests determine characteristics 41Cr4 steel. Its hardness also tested. aim prepare table with properties above-mentioned...

The objective of this work is to present the numerical simulation air-bending process DC01 steel. There are plenty works concerned with assessing springback phenomenon in bending also using anisotropic material models (Hill’s model widely used). However, very few recent publications about fatigue life assessment bent products. As ensuring proper resistance products vital for increasing safety and widening service intervals there certainly a need perform investigations field. In work, air...

The shearing process such as the blanking of sheet metals has been used often to prepare workpieces for subsequent forming operations. This consists in separating a blank from by means high-localized shear deformation due action punch. Blanking modelling is becoming an increasingly important tool gaining understanding and improving this process. At moment fundamental problem numerical processes excessive element distortion finite-element simulation. In study, we present hybrid approach, SPH...

The article presents an innovative method of reducing welding distortions thin-walled structures by introducing structural and technological changes. accuracy the was demonstrated on example stub pipes to outer surface a tank with large dimensions, made steel 1.4301 wall thickness 1.5 × 10−3 (m). During traditional Gas Tungsten Arc Welding (GTAW), base are formed, flatness deviation which 11.9 (m) exceeded permissible standards. As result changes, not only does joint stiffness increase, but...

The paper presents the results of experimental researches and numerical simulations duplex burnishing process. During process treatment is carry out in two stages. In first stage - on semi-fabrication surface, regular asperities are embossed with triangular, symmetrical, periodic outline. second burnished (smooth burnishing) till needed equalized, resulting a smooth strengthened surface layer. implementation such technology receiving new layer characterized by favorable functional...