scholarly journals New technological potentialities of finish-strengthening by surface plastic deformation

2017 ◽  
Vol 2 (3) ◽  
pp. 25-30 ◽  
Author(s):  
Семен Зайдес ◽  
Semen Zaides ◽  
Као Нго ◽  
Сao Ngo
Keyword(s):  
Plastic Deformation ◽  
Stressed State ◽  
Strain State ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Factors Affecting ◽  
Simulation Process ◽  
Simulation Results ◽  
Definition Of ◽  
The Impact

The paper reports the results of the strengthening simulation process. A new kinematics of deforming rollers ensuring a surface plastic deformation of shafts of low rigidity was considered. On the basis of the theory of low elasto-plastic deforma-tions and a method of finite elements there were formed simulators of a strengthening process allowing the definition of a stressed state in a sample depending on the form and kinematics of an indenter. With the aid of ANSYSWB software there was considered the impact of some circuits of deformation upon a stressed state: running-in by rolling, running-in by slip, running-in by one and two rollers with the rotation with regard to a diametrical axis. On the basis of simulation results it was revealed that the basic factors affecting a stress-strain state of parts are geometry, a form, a mutual location of elements of a tool deformed and their kinematics with regard to a part worked.

Study of Surface Layer Hardening after Treatment Complex Tool

2020 ◽  
Vol 303 ◽  
pp. 89-96
Author(s):  
K.S. Mitrofanova
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Strain State ◽  
Experimental Studies ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Technological Inheritance ◽  
Multiple Loading ◽  
Surface Layer Hardening ◽  
Solidified Body

The results of experimental studies of the thin surface layer of samples made of steel 45 after treatment with surface plastic deformation (SPD) multiradius roller (MR-roller) are presented. On the basis of the apparatus of the mechanics of technological inheritance, taking into account the effect of the solidified body, a model of the process according to the scheme of multiple loading-unloading of metal, taking into account the phenomenology of the SPD process and the properties of the material, is created. Distributions of parameters of the stress-strain state in the deformation centre are obtained, the parameters of roughness and microhardness of the surface layer are investigated.

scholarly journals Impact of local deformation kinematics upon stressed state of surface layer

2019 ◽  
Vol 2019 (5) ◽  
pp. 32-48
Author(s):  
Семен Зайдес ◽  
Semen Zaides ◽  
И. Бобровский ◽  
I. Bobrovsky ◽  
Ван Фам ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Plastic Deformation ◽  
Strain State ◽  
Surface Plastic Deformation ◽  
Local Deformation ◽  
Surface Plastic ◽  
Deformation Kinematics ◽  
State Changes ◽  
Process Computer ◽  
Tool Motion

A kinematics of a deforming tool motion for stress-strain state changes in the point of an elastic-plastic deformation and residual stresses increase at surface plastic deformation is developed. The results of a loading process computer simulation under different conditions of a deforming tool contact with a part which give a possibility to increase the effectiveness of a new method of the finishing-strengthening of orbital surface plastic deformation are shown.

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 Numerical Study of Stress-Strain State of Workpiece in Contact Problem of Surface Mandrel Drilling

2021 ◽  
Vol 20 (3) ◽  
pp. 259-267
Author(s):  
N. S. Sivtsev ◽  
V. V. Tarasov
Keyword(s):  
Plastic Deformation ◽  
Friction Coefficient ◽  
Contact Interaction ◽  
Computational Experiment ◽  
Strain State ◽  
Numerical Study ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Stress Strain ◽  
Stress Strain State

In recent years, the economic factor has played an increasingly important role in the selection of technologies for manufacturing machine parts with specified values of normalized parameters of geometric accuracy and quality of working surfaces. As applied to surface plastic deformation processes, this is noticeably manifested in the search for effective friction control methods in the “tool – workpiece” pair, which ultimately determines the distribution pattern and the magnitude of stresses and strains in the workpiece and the tool. It is not possible to obtain a rigorous analytical solution to the problem of establishing a connection between surface conditions, friction, and the stress-strain state of the contacted bodies. In this regard, the construction of mathematical models comes to the fore, the solution of which is possible by numerical methods. The paper presents the results of a numerical study (computational experiment) of a finite-element model of workpiece deformation under various conditions of contact interaction and friction by one of the methods of surface plastic deformation – surface mandrel drilling. The friction coefficient has been chosen as the criterion for assessing the conditions of contact interaction and friction. It is shown that a change in the friction coefficient in the process of surface mandrel has no noticeable effect on the formation of a stress field in the deformable workpiece both in the axial, and in the radial and circumferential directions. At the same time, with an increase in the value of the friction coefficient in the “tool – workpiece” pair and with the associated increase in the force of mechanical resistance to deformation of the workpiece, their growth is observed. A computational experiment has confirmed the presence of non-contact deformations of the workpiece and tool during surface mandrel drilling, as well as  as a decrease in the value of residual deformations in the workpiece with a decrease in the coefficient of friction. Balance assessment of contact surface displacements in the workpiece (the inner surface of the hole to be machined) and the tool (mandrel) has shown that the deformations of the tool in the elastic region can lead to a significant decrease in the real tightness of surface mandrel drilling.

scholarly journals Finish-strengthening treatment with surface-plastic deformation

2021 ◽  
Vol 2021 (4) ◽  
pp. 3-9
Author(s):  
Roman Gurov ◽  
Andrey Shcherbakov
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Quality Criteria ◽  
Surface Plastic Deformation ◽  
Quality Parameters ◽  
Geometrical Parameters ◽  
Surface Plastic ◽  
Processing Modes ◽  
Definition Of ◽  
Surface Layer Quality

There are offered dependences for the definition of parameters formed for surface layer quality when finishing and finish-strengthening with surface-plastic deformation, for the definition of processing modes, tool geometrical parameters taking into account initial parameters of surface layer quality. Criteria for the choice of the processing method ensuring quality parameters required for a surface layer and surface operation properties are offered.

Dressing of shafts by surface plastic deformation with elastic bending of a billet at machining process

2020 ◽  
pp. 62-66
Author(s):  
G.V. Muratkin ◽  
V.A. Sarafanova
Keyword(s):  
Plastic Deformation ◽  
Strain State ◽  
Residual Deformation ◽  
Surface Plastic Deformation ◽  
Machining Process ◽  
Surface Plastic ◽  
Stress Strain ◽  
Elastic Bending ◽  
Stress Strain State ◽  
Accuracy Stress

A method for dressing of non-rigid parts by surface plastic deformation is proposed, which is based on a change in the stress-strain state of the billet during finishing and hardening processing. Keywords non-rigid shaft, dressing, surface plastic deformation, technological residual deformation, accuracy, stress. [email protected]

scholarly journals Deformation force impact at surface plastic deformation upon strengthening depth of part surface layer

2020 ◽  
Vol 2021 (1) ◽  
pp. 44-48
Author(s):  
Andrey Virt
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Part Surface ◽  
Force Impact ◽  
Deformation Force ◽  
The Impact

The results of investigations carried out on the impact of deformation force upon the depth of surface layer strengthening of a part are presented. There is presented a procedure of investigations carried out, the equipment used is shown. The recommendations for the choice of modes for processing with surface plastic deformation are given.

scholarly journals Constructive and technological method of increasing durability of “choke connections”

2021 ◽  
Vol 2131 (4) ◽  
pp. 042061
Author(s):  
Y G Lyudmirskii ◽  
S S Assaulenko ◽  
S O Ageev
Keyword(s):  
Plastic Deformation ◽  
Base Metal ◽  
Strain State ◽  
Low Cycle Fatigue ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Cycle Fatigue ◽  
Static Loads ◽  
Maintenance System ◽  
Shape And Size

Abstract Welded circular seams of “choke joints”, as a rule, have deviations from the specified diameter. This leads to uneven deformation, and sometimes to the absence of deformations in some areas of the seam. With repeated static loads, destruction arises in these places. To connect to the maintenance system of connections with the base metal, used as a guide, surface plastic deformation of the zone zone is carried out. A technology and equipment have been developed that allow plastically deforming the area of transition from the weld to the base metal along the entire length of the circular weld. As a result of plastic deformation along the technological groove, the characteristics of low-cycle fatigue of welded joints are obtained, which are not inferior to the base metal. To reduce stresses in the zone of transition from the weld to the base metal, it is proposed, first, to perform a circular groove on the base metal by machining, as close as possible to the specified zone. To assess the influence of the shape and size of the groove on the stress-strain state of the zone of conjugation of the weld metal with the base metal, FEM calculations were carried out

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