scholarly journals Justification of the Application of Resource-Saving Technology for the Restoration of Metal-Intensive Rear Semi-Axles of Trucks Using Hot Plastic Deformation

2021 ◽  
Vol 14 (1) ◽  
pp. 16
Author(s):  
Konstantin P. Kolotyrin ◽  
Sergey A. Bogatyrev ◽  
Yuri Yu. Kostyukhin ◽  
Diana Yu. Savon ◽  
Alexey I. Shinkevich
Keyword(s):  
Plastic Deformation ◽  
Evaluation Criteria ◽  
Experimental Information ◽  
Resource Saving ◽  
Butt Welding ◽  
Power Characteristics ◽  
Variable Diameter ◽  
Repair Materials ◽  
Cylindrical Parts ◽  
Repair Facility

The article is devoted to the substantiation of technological foundations for the restoration of extremely worn-out, metal-consuming, and resource-consuming parts, in a method consisting of applying a compensating metal wear with subsequent plastic deformation. Currently, there are no technologies for their restoration in a repair facility that guarantee the resilience of the factory product. The proposed technological process of repair consists of butt welding onto the end of the spline semi-axle shank, compensating for the wear of the metal, the volume of which takes into account the losses resulting from the wear of the slots, as well as allowances for their machining. In the example of forging the axle shaft of a truck’s driving axle, the regularities of the plastic flow of metal during part deformation in the stamp are revealed. In the process of hot volumetric upsetting of long cylindrical parts with a variable diameter, it is important to know the possible directions of metal movements, as well as the energy-power characteristics of the process at various stages of forging. The evaluation criteria of the level of perfection of the technology were indicators of resource conservation and efficiency of the recovery route. The technological direction of the conducted research was analyzed, step by step, from the standpoint of saving repair materials and energy resources. The results of theoretical studies are crucial in the design of die tooling, for the manufacture of blanks, when restoring the rear axle shafts of trucks with pressure. Production tests carried out on the models, obtained as a result of mathematical processing of experimental data, confirmed the reliability of the experimental information. The introduction of the proposed set of repair equipment for the restoration of semi-axles will allow the formation of additional production in the region for the recycling of worn-out metal-intensive steel parts of agricultural machinery.

Investigation of different tribological systems during full forward impact extrusion of aluminum alloy EN AW 6082

2019 ◽  
Vol 72 (6) ◽  
pp. 709-712
Author(s):  
Martina Müller ◽  
Rafael Hild ◽  
Daniel Trauth ◽  
Thomas Bergs
Keyword(s):  
Aluminum Alloy ◽  
Peer Review ◽  
Evaluation Criteria ◽  
Resource Saving ◽  
Metallic Contact ◽  
Cold Forming ◽  
Content Type ◽  
Tribological System ◽  
Die Surface ◽  
The Mean

Purpose The modification of the tribological system is an essential aspect of the implementation of resource-saving processes in cold forming. As a result, the focus of this contribution is the influence of the tribological system on the full forward impact extrusion of aluminum alloy EN AW 6082 (T6) with regard to reduction of friction and wear. Design/methodology/approach The investigations included a variation of lubricant and die treatment. Friction, wear and the mean arithmetic height Sa were used as evaluation criteria. The aim was to find a suitable die surface treatment and a suitable lubricant on the basis of the evaluation criteria. Findings The experiments indicated that each of the selected tribological systems prevents physical metallic contact between tool and workpiece and thus prevents the formation of wear. Nevertheless, differences were found in the areas of smoothing of workpiece surfaces and adhesive strength of lubricants. Originality/value As general cause effect relationships between die coating and lubricant are not known in the field of bulk metal forming of aluminum, fundamental investigations are described below. The investigations focus on the influence of the material and the tribological system on friction as well as wear. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0316

scholarly journals Transverse and Longitudinal Stress Analysis in Reinforced Welded Oil Branched Pipes

2018 ◽  
Vol 167 ◽  
pp. 02004
Author(s):  
H Safari ◽  
R Pourrajab ◽  
A Yaghootian
Keyword(s):  
Plastic Deformation ◽  
Thermal Strain ◽  
Welding Process ◽  
Longitudinal Stress ◽  
High Importance ◽  
Butt Welding ◽  
Single Pass ◽  
Practical Procedure ◽  
Pipe Line ◽  
Tee Junction

Welding process results in the non-uniform distribution of heat. Combined with thermal strain, plastic deformation and welding-induced distortion, it causes important problems such as failure. This study models welding process in a 12×16 split tee junction using finite element. This junction is a reinforcing branch used in the hot taping of oil pipe line. The model is studied in 3D state. This zone, i.e. heat affected zone (HAZ) is of high importance due to the existence of a severe temperature gradient and stress in the vicinity of HAZ. This study analyses single pass butt welding with a cooling time of 2700 seconds. In order to apply boundary conditions to the model, the studied structure should be in Free State according to practical procedure. The main aim of this simulation is to analyse Longitudinal and transverse residual stresses originated from co-directional and opposite-directional welding. This joint is formed of two semicircles welded to each other as linear single pass welding. Two welders simultaneously welded both sides of the pipe.

scholarly journals Assessment of stress-strain state in cylindrical parts after transverse running with flat plates

2017 ◽  
Vol 2 (5) ◽  
pp. 38-43 ◽  
Author(s):  
Семен Зайдес ◽  
Semen Zaides ◽  
Дак Фам ◽  
Dac Pham
Keyword(s):  
Plastic Deformation ◽  
Strain State ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Flat Plates ◽  
Stress Strain ◽  
Program Complex ◽  
Vertical Loading ◽  
Stress Strain State ◽  
Cylindrical Parts

For the deformation strengthening of parts like axles, pins, and bushes there is offered a method of surface plastic deformation based on blank rolling with flat plates. The method allows machining parts which do not have center holes. At transverse running a blank bending affected by transverse loading forces is excluded. With the aid of ANSYS program complex there is considered a change of a stress-strain state in cylindrical parts at transverse running. There are defined plastic and elastic cylinder deformations after loading. The distribution of residual stresses along cylinder section in the plane of vertical loading is obtained. The stress state of samples run with flat plates on equivalent stress is assessed. An efficient value of running at transverse running used as a basic parameter of surface plastic deformation is defined.

scholarly journals Using the Hybrid Metal Extrusion & Bonding (HYB) Process for Butt Welding of 4 mm Plates of AA6082-T6

2018 ◽  
Vol 188 ◽  
pp. 03017
Author(s):  
Lise Sandnes ◽  
Øystein Grong ◽  
Jan Torgersen ◽  
Filippo Berto
Keyword(s):  
Plastic Deformation ◽  
Solid State ◽  
Yield Strength ◽  
Heat Affected Zone ◽  
Aluminium Alloys ◽  
Base Material ◽  
Butt Welding ◽  
Exploratory Investigation ◽  
Metal Extrusion ◽  
Solid State Joining

Hybrid Metal Extrusion & Bonding is a new solid state joining technique developed for aluminium alloys. By the use of filler material addition and plastic deformation sound joints can be produced at operational temperatures below 400 °C. This makes the HYB process more flexible and less vulnerable to defects compared to conventional solid state processes. Here, we present the results form an exploratory investigation of the mechanical integrity of a 4 mm AA6082-T6 HYB joint, covering both hardness, tensile and Charpy V-notch testing of different weld zones. The joint is found to be free from internal defects like pores, cavities and kissing bonds. Still, a soft heat affected zone (HAZ) is present. The joint yield strength is 54 % of the base material, while the corresponding joint efficiency is 66%. Therefore, there is a potential for further optimization of the HYB process. This work is now in progress.

THE STUDY OF THE PROCESS OF ROLLING PIPES FROM ANISOTROPIC MATERIAL

2017 ◽  
Vol 21 (4) ◽  
pp. 75-87
Author(s):  
G. M. Zhuravlev ◽  
A. E. Gvozdev ◽  
A. A. Kalinin ◽  
O. V. Kuzovleva ◽  
E. V. Ageev ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Stress State ◽  
Stress Distribution ◽  
Plane Deformation ◽  
Yield Condition ◽  
Biaxial Stress ◽  
Resource Saving ◽  
Cylindrical Anisotropy ◽  
Biaxial Stress State ◽  
Deformation State

The process of rolling pipe with simultaneous significant changes in pipe diameter and thickness is carried out at the mandrel stage. In the region of plastic deformation, biaxial stress and plane deformation state of a pipe take place. The area of biaxial stress state is characterized by the presence of two sections: a section of the sptial bending before the contact with the roll and a section which is in contact with the cylindrical surface of the roll. It is assumed that the material of a tube blank is incompressible, has a cylindrical anisotropy of mechanical properties, is anisotropically hardenable, for which the Mises-Hill yield condition and the associated law of plastic flow are valid. The article considers stress distribution in the areas of biaxial stress state. To take into account the anisotropic hardening of the material information concerning distribution of deformations in the region of plastic deformation was taken into account. The problem of stress distribution in the region of plane deformation state of the region of plastic deformation was considered. It is assumed that radial flow of the material occurs in the region and Coulomb's law of friction is realized at the contact boundaries of the workpiece and the tool. The change in the direction of material flow at the inlet and outlet of the region is taken into account by means of radial stress modification with regard to the discontinuity of the tangential component at the boundary of the deformation region by the work balance method. The expressions obtained for determining deformations and stresses makes it possible to analyze the process of rolling pipes at the mandrel stage taking into account material anisotropy. The obtained results can be used to create resource-saving technologies for processing metallic materials using new nanocomposite lubricants and coatings.

Influence of the deforming tool kinematics on the stress state of the surface layer during hardening of cylindrical parts

2021 ◽  
pp. 28-32
Author(s):  
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Stress State ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
The Finite Element Method ◽  
Kinematic Scheme ◽  
Local Surface ◽  
Hardening Process ◽  
Cylindrical Parts

The influence of kinematic schemes of processing by local surface plastic deformation on the intensification of the stressed state of cylindrical surfaces of parts is considered. On the basis of the finite element method by computer simulation, a mathematical model of the hardening process was obtained to determine the stress state in the surface layer for different hardening schemes. Keywords: kinematic scheme of processing, deforming tool, orbital burnishing, intensification of the stress state, residual stresses, depth of plastic deformation. [email protected], [email protected]

scholarly journals Modification of the Corrosion Properties of a Model Fe-8Ni-18Cr Steel Resulting from Plastic Deformation and Evaluated by Impedance Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Pierre-Yves Girardin ◽  
Adrien Frigerio ◽  
Patrice Berthod
Keyword(s):  
Plastic Deformation ◽  
Impedance Spectroscopy ◽  
Corrosion Behaviour ◽  
Charge Transfer Resistance ◽  
Compression Tests ◽  
Corrosion Properties ◽  
Transfer Resistance ◽  
Minor Elements ◽  
Cylindrical Parts

A model {minor elements}-free Fe-8Ni-18Cr alloy (wt%) was elaborated by foundry, then cut in several cylindrical parts which were subjected to compression tests leading to different plastic deformation rates. The axis surface of the obtained samples were characterized in corrosion by impedance spectroscopy in an acid sulphuric solution. The obtained EIS results were plotted in the complex plan of Nyquist and the diagrams were all semicircular but with an average radius decreasing when the deformation rate increased. The plastic deformation obviously induced a decrease in charge transfer resistance, revealing a detrimental effect of the corrosion behaviour as the most often reported in studies involving stationary methods of electrochemical characterization of corrosion. It was also found that the capacitance tends to increase with the rate of plastic deformation by compression.

Modeling of the Contact Interaction of the Tool Indenter with the Part Surface when Processing by Surface Plastic Deformation Methods

2021 ◽  
Vol 1037 ◽  
pp. 564-570
Author(s):  
Vladimir P. Fyodorov ◽  
Maxim N. Nagorkin ◽  
Mikhail L. Kheifetz ◽  
Evgeny A. Polsky
Keyword(s):  
Plastic Deformation ◽  
Steady State ◽  
Contact Interaction ◽  
Quantitative Estimation ◽  
Surface Plastic Deformation ◽  
Resistance Force ◽  
Surface Plastic ◽  
Part Surface ◽  
Diamond Burnishing ◽  
Cylindrical Parts

There are results of studying the parameters of the indenter contact interaction with the surface when processing cylindrical parts made of 45 steel of different hardness by surface plastic deformation (SPD) methods with single-indenter elastic tools (diamond burnishing, ball burnishing). There were considered such characteristics as the resistance force when the indenter starts and in the steady state of SDP, the range of force fluctuations during processing, friction factor when the indenter starts and in the steady state, as well as some derivative coefficients. Adequate physical-statistical models for the quantitative estimation of the contact interaction parameters from SPD processing factors are obtained.

INVESTIGATION OF REGULARITIES OF PLASTIC DEFORMATION OF HOLLOW STEEL PROFILES BY COMPRESSION

2019 ◽  
Vol 6 (3) ◽  
pp. 22-26
Author(s):  
Alla Alexandrovna Gerasimova
Keyword(s):  
Plastic Deformation ◽  
Energy Absorption ◽  
Cross Sections ◽  
Mechanical Energy ◽  
Steel Pipes ◽  
Power Characteristics ◽  
Safety And Reliability ◽  
Maximum Effort ◽  
Control Of Parameters ◽  
Energy Absorbing

The article studies the kinematics of elastic-plastic deformation of hollow steel profiles. The aim of the work was to improve the power characteristics of the processes of plastic deformation of energy-absorbing structural elements of the hollow profile of vehicles and to increase the passive safety and reliability of equipment. Finite element modeling of kinematics of processes with control of parameters of energy absorption of steel pipes of various cross sections was carried out. The results of virtual studies of bending and precipitation at the end of a number of hollow profiles in the form of pipes of different sections have shown ample opportunities to control the process of mechanical energy absorption by selecting the design of pipes, control the results of modeling the absorbed energy and the maximum effort on the indicator diagram of the deformation process.

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