Technological improvement of the durability of internal screw surfaces

2021 ◽  
Vol 2021 (9) ◽  
pp. 19-25
Author(s):  
Ivan Cukanov
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Experimental Studies ◽  
Average Diameter ◽  
Surface Plastic Deformation ◽  
Quality Parameters ◽  
Surface Plastic ◽  
Technological Improvement ◽  
Screw Surface ◽  
Internal Screw

The methods and some ways of technological improvement of the durability of internal screw surfaces are given. To increase the durability, finishing and strengthening machining with surface plastic deformation and threading with a cutter of a variable average diameter are proposed. The dependences for the specification of machining modes and the results of experimental studies of the screw surface quality parameters and wear resistance of running nuts are given.

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 Studying wear resistance of steel friction pairs under high contact pressure in water-abrasive medium

2019 ◽  
Vol 2019 (4) ◽  
pp. 23-29
Author(s):  
Валерий Петровский ◽  
Valeriy Petrovskiy ◽  
Анатолий Рубан ◽  
Anatoliy Ruban
Keyword(s):  
Heat Treatment ◽  
Plastic Deformation ◽  
Wear Resistance ◽  
Friction Pair ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Abrasive Medium ◽  
Operational Tests ◽  
A Chain ◽  
Efficiency And Reliability

The paper is focused on the problem of the service life of the dredger chain, which largely depends on the efficiency and reliability of the hinge joint, when a mineral abrasive gets into the structural gap resulting in rapid wear of the joint under high dynamic loads. There has been developed a science-based technology of repairing parts of the assembly, without reducing the resource, from cheap and accessible (non-deficient) materials, taking into account modern technical and economic requirements, on samples. Wear resistance of samples of friction pairs has been defined in terms of a chain operating model. The research method is based on comparing the wear rate of samples in a pair made of steel 110Mn13 (sleeve - pin), 110Mn13 and 38CrNi3M (sleeve - pin), according to the standard technologies and taken as a reference, with pairs made of steel 110Mn13, C45K, facing with wire SV08A, electrodes E50A – UONI 13/55 and E – 190Cr5Si7 – LEZ – T – 590 – NG after heat treatment, chemical and heat treatment, surface plastic deformation. Samples were tested in the water-abrasive environment with a load of 6615 N (675 kgf). The wear resistance parameters were determined as following: 1) reference pairs of steel 110Mn13 (bushing-pin) and 110Mn13 (bushing), 38CrNi3Mo (pin); 2) pairs of steel 110Mn13 (bushing) and facing with wire SV08A (pin); 3) pairs of steel 110Mn13 (bushing) and cladding with electrodes E–190Cr5Si7–LEZ –T–590– NG (pin); 4) pairs of steel C45K (bushing) and cladding with E –190Cr5Si7 – LEZ – T – 590 – NG electrodes (pin); 5) pairs of steel C45K (bushing) and clad-ding with E50A – UONI 13/55 electrodes (pin). A graph of dependence of the bushing and pin wear on the relations of initial hardness and structures of friction pair has been built. It is recom-mended to restore the pin with wear-resistant electrodes E – 190Cr5Si7 – LEZ – T – 590 – NG paired with 110Mn13 steel bushing with surface plastic deformation. The wear resistance of a pair, with a different combination of structures, does not depend on the ratio of hardness of Hsl / Hfin. The materials of the pair worn within the reference samples can be recommended for the operational tests.

Investigation of tool wear resistance when smoothing parts

2020 ◽  
Vol 98 (4) ◽  
pp. 40-44
Author(s):  
D. Marchenko ◽  
◽  
K. Matvyeyeva ◽  
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Tool Wear ◽  
Surface Plastic Deformation ◽  
Positive Influence ◽  
Surface Plastic

The article discusses the method of surface plastic deformation of steel parts by smoothing. The positive influence of this method on the wear resistance of the tool has been established under conditions of intense wear and with abundant lubrication

scholarly journals The Study of Multiradius Roller Running Process

2019 ◽  
Vol 297 ◽  
pp. 05003
Author(s):  
Andrey Krechetov ◽  
Kristina Mitrofanova
Keyword(s):  
Plastic Deformation ◽  
Surface Layer ◽  
Hydrostatic Pressure ◽  
Experimental Studies ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Engineering Technology ◽  
Processed Material ◽  
Sample Structure ◽  
Single Radius

The results of theoretical and experimental studies of the surface of the sample of steel 45 after surface plastic deformation (SPD) with multi-radius roller (MR-roller) is shown. The goal of this study is to expand the technological capabilities of the method of SPD through the use of a new design of the deforming tool developed at the Department of Engineering Technology of KuzSTU. The advantage of the MR-roller (Patent RU № 2557377) over the traditional tool for SPD (single-radius roller) is the possibility of creating a large hydrostatic pressure in the deformation zone, without destroying the surface layer of the processed material. The research technique included finite element modeling (FEM), microhardness measurement, metallographic studies of the sample structure. As a result of the study, some regularities of the process of hardening by a multi-radius tool with high hydrostatic pressure and a large number of quasi-monotonic deformation sites were revealed. The results indicate a significant hardening without metal destruction and the formation of nanoscale grains, which allows to improve the properties of rolled products in the application of high operating loads.

scholarly journals EXPERIMENTAL STUDIES OF ROUGHNESS BY SURFACE PLASTIC DEFORMATION ON FLAT SURFACES

2019 ◽  
Vol 3 ◽  
pp. 148
Author(s):  
Angel Lengerov
Keyword(s):  
Plastic Deformation ◽  
Surface Quality ◽  
Experimental Studies ◽  
Surface Plastic Deformation ◽  
Dispersion Analysis ◽  
Surface Plastic ◽  
Flat Surfaces ◽  
Graphical Interpretation ◽  
Spherical Element ◽  
Main Effects

The article presents experimental studies of the roughness by surface plastic deformation (SPD) on flat surfaces of steel 45. A dispersion analysis was used to study the influence of various factors on the surface quality. From the experimental studies and the dispersion analysis made, a graphical interpretation of the main effects was obtained. Graphical visualizations of the roughness pattern after SPD on the processed surfaces were obtained. Overlapping sinusoidal movements of the deforming spherical element were realized.

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.

Effect of Molybdenum on the Wear Properties of (Ti,Mo)C-TiB2-Mo2B Particles Reinforced Fe-Based Laser Cladding Composite Coatings

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
M. Zhang ◽  
S. X. Luo ◽  
S. S. Liu ◽  
X. H. Wang
Keyword(s):  
Plastic Deformation ◽  
Wear Resistance ◽  
Laser Cladding ◽  
Composite Coatings ◽  
Surface Plastic Deformation ◽  
Surface Plastic ◽  
Wear Properties ◽  
Laser Cladding Process

(Ti,Mo)C, TiB2, and Mo2B particles reinforced Fe-based composite coatings were fabricated by laser cladding process. The effects of Molybdenum (Mo) on the microstructure and wear properties of the coatings were investigated. The results show that block-like or cuboidal TiB2, Mo2B and flower-like (Ti, Mo)C ceramics reinforcements were formed in the coatings. The size of reinforcements reduced with the increasing of FeMo70. However, cracks were found in the coating, while the addition of FeMo70 exceeded 9 wt %. The laser cladding coating presented a good wear resistance with a 9 wt % addition of FeMo70. With the increasing of FeMo70, the coatings enhanced the capability of resisting microcutting, microplowing, and surface plastic deformation.

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