scholarly journals A Cold-Pressing Method Combining Axial and Shear Flow of Powder Compaction to Produce High-Density Iron Parts

Technologies ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 70 ◽  
Author(s):  
Grigoriev ◽  
Dmitriev ◽  
Korobova ◽  
Fedorov
Keyword(s):  
Material Flow ◽  
Axial Loading ◽  
Powder Compaction ◽  
Friction Forces ◽  
Pressing Method ◽  
Cold Pressing ◽  
Traditional Design ◽  
Active Friction ◽  
Set Up ◽  
Active Friction Forces

Highly performance methods for cold pressing (cold die forging) of preforms from iron powder with subsequent heat treatment and producing ready parts made of powder are described in the paper. These methods allow fabricating parts with smooth surfaces and improved mechanical characteristics—porosity, tensile strength. Application of the traditional design set-up with a single-axial loading is restricted to high stresses in the dies to deform the preforms that lead to cracks formation. New powder compaction schemes by applying active friction forces (shear-enhanced compaction) make it possible to unload dies and produce high-quality parts by cold pressing. The scheme allows moving the die in the direction of the material flow with a velocity that exceeds the material flow velocity.

scholarly journals FORMATION OF QUALITATIVE INDICATORS OF PRODUCTS BY ROLLING STAMPING PROCESSES

2021 ◽  
pp. 75-83
Author(s):  
Viktor Matviychuk ◽  
Mykola Kolisnyk
Keyword(s):  
Wall Thickness ◽  
Relative Difference ◽  
Workpiece Material ◽  
Friction Forces ◽  
Utilization Factor ◽  
Service Characteristics ◽  
Metal Stamping ◽  
Active Friction ◽  
Deformation Kinematics ◽  
Active Friction Forces

The influence of rolling stamping on the service characteristics of products is investigated in the work. Based on the analysis of deformation kinematics, stress-strain state, microstructure and evaluation of deformability of workpiece material, ways to increase geometric accuracy, vacuum tightness, electrolytic stability and mechanical characteristics of product material, as well as ways to improve the material of workpieces for their subsequent processing. The influence of active friction forces on the nature of the material flow during SHO was established, which contributed to the development of new processes that allow to bring the shape and dimensions of the workpiece as close as possible to the finished part. Thus accuracy of the sizes of details corresponds to 7-11th qualities of accuracy, and roughness of the processed surfaces makes Ra = 2,5… 0,63 microns. The process of reshaping the square billets into round ones by the method of SHO is effective, which increases the utilization factor of the metal and reduces the anisotropy of its mechanical properties. The characteristic of flat anisotropy λr, adopted in sheet metal stamping as a characteristic of the ability of the material to form scallops, decreases as a result of reshaping by 70-80%. The relative difference in yield strength in the plane of the sheet decreases from 0.10-0.15 to 0.03-0.05. The ultimate tensile strain increases by 8-10%, and the uniform uniform strain - by 5-8%. This improvement in the characteristics of the material reshaped by rolling blanks leads to the fact that when drawing cylindrical products, the value of scallops decreases by 2-2.5 times, and the value of the maximum degree of drawing increases by 10-15%. This reduces the relative difference in wall thickness along the perimeter of the elongated workpiece, and the change in wall thickness along its height becomes linear. Thus, the use of SHO processes significantly improves the quality characteristics of products.

PIPE BENDING WITH APPLICATION OF ACTIVE FRICTION FORCES

2020 ◽  
Vol 6 ◽  
pp. 58-61
Author(s):  
M.I. BORZENKOV ◽  
I.S. VDOVIN ◽  
Yu.S. RADCHENKO ◽  
N.V. TATARCHENKO
Keyword(s):  
Engineering Analysis ◽  
Active Deformation ◽  
Friction Forces ◽  
Active Friction ◽  
Active Friction Forces ◽  
Deformation Area ◽  
Pipe Bending

An engineering analysis of pipe bending along a circular copier with a deviation of flat material sections from the normal (by Love) position is performed, the dimensions of the active deformation area and the reactions of tools that generate friction forces are determined.

Numerical analysis of porous blank die forging in the die with the implementation of active friction forces

2020 ◽  
pp. 17-24
Author(s):  
G. A. Bagliuk ◽  
S. F. Kyryliuk
Keyword(s):  
Material System ◽  
Porous Powder ◽  
Compression Force ◽  
Friction Forces ◽  
High Deformation ◽  
Deformation Intensity ◽  
Die Forging ◽  
Active Friction ◽  
Deformation Force ◽  
Active Friction Forces

The paper provides the results of simulating the hot die forging of porous powder preforms with active friction forces applied along the lateral surface of the deformable blank by means of internal cohesion in the die-material system. The study covers the evolution of relative density distribution over the blank cross section at different stages of deformation, stress-strain state and total strain force while varying the loading boundary conditions by changing the initial compression force applied to elastic elements that prevent the die from displacement. It is shown that active friction forces acting on the periphery of the forging adjacent to the die inner side result in areas with a significantly higher deformation intensity compared to deformations in the center of the blank volume. At the same time, the volume of the high deformation intensity area and maximum values of deformation increase with a decrease in the spring initial compression force and, accordingly, with an increase in the die displacement value during deformation. Automatic die displacement due to internal cohesion in the die-deformable material system leads to a decrease in the total deformation force, and with a decrease in the die displacement value during deformation, the deformation force increases.

Gas chromatographic analysis of the fatty acid composition of mustard oil obtained by cold pressing (method)

2020 ◽  
pp. 391
Author(s):  
Alexander Nikolaevich Ostrikov ◽  
Natalya Leonidovna Kleymenova ◽  
Inessa Nikolaevna Bolgova ◽  
Maxim Vasilyevich Kopylov
Keyword(s):  
Fatty Acids ◽  
Composition Studies ◽  
Test Sample ◽  
Component Composition ◽  
Mustard Oil ◽  
Gas Liquid Chromatography ◽  
Pressing Method ◽  
Cold Pressing ◽  
Annular Gap ◽  
Β Carotene

Nowadays there is such a type of product as mustard oil, which is a stockpot of valuable fatty acids and vitamins. Mustard oil is used in various fields of industry. It has a characteristic smell and taste, yellow-brown color. Mustard grows mostly in the southern regions. It is resistant to various diseases and pests. There is evidence from scientific research that proves the beneficial properties of this oilseed. Mustard oil was obtained by cold pressing under the following conditions: annular gap of the grain chamber of the oil press was 0.6 mm; screw rotation speed was 166 rpm; pressing temperature was 345 K. The study of the component composition of mustard oil was carried out by gas-liquid chromatography. The qualitative composition of the test sample was determined in the work. It contains the following acids - palmitic (4%), stearic (3%), polyunsaturated acids - linoleic (32%), linolenic (8%) and eicosenic (2%), monounsaturated acid - oleic (47%). The data obtained correlate with literary data. It was proved that unsaturated acids can act as essential nutrients. The presence of other fatty acids, the amount of which is within acceptable limits, is also identified in the work. Mustard oil vitamin composition studies were carried out according to standard methods. Vitamins A, E, K, β-carotene and α, β + γ, δ tocopherols were found in the original sample. Vitamins A, E, K increase immunity and strengthen the walls of blood vessels, as well as are anti-inflammatory substances. The presence of tocopherols benefits the skin. The results of studies of mustard oil allow us to conclude that the components identification is necessary for the development of balanced blends with a reduced amount of saturated acids and a high amount of semi-saturated acids.

scholarly journals PRODUCTION OF OILS USING THE COLD PRESSING METHOD

2021 ◽  
Vol 86 (5-5) ◽  
Author(s):  
Jasur Farmonov ◽  
Farrukh Davlatov ◽  
Sherzod Qodirov ◽  
Kamar Serkaev ◽  
Murodjon Samadiy
Keyword(s):  
Pressing Method ◽  
Cold Pressing

Effect of active action friction forces on technological parameters of backward extrusion

2021 ◽  
pp. 25-33
Author(s):  
B.S. Moroz ◽  
M.G. Dudnik
Keyword(s):  
Extrusion Process ◽  
Technological Parameters ◽  
Deformation Degree ◽  
Friction Forces ◽  
Backward Extrusion ◽  
Deformation Force ◽  
Active Friction Forces ◽  
The Impact ◽  
Experimental Researches ◽  
Experimental And Theoretical Studies

The parameters of deformation degree at theoretical and experimental researches of cold backward extrusion processes of hollow glasses-type products are considered. The dependences of their relationship with the relative degree of deformation and the scale of their conformity are suggested. The published results of experimental and theoretical studies on the impact of technological parameters of the backward extrusion process of hollow products in the conditions of active friction forces to reduce the deformation force and stress-strain state of the billet are analyzed. Insuffi ciently studied features of the process and the possibility for expanding of the application fi eld of the backward extrusion method with the active action of friction forces are noted. The method for calculating of the deformation rate required to determine the current stress in the implementation of the hot backward extrusion process.

scholarly journals Clarification of Features of the Wheel Movement with a Perspective Constructive Scheme on a Rail

2020 ◽  
Vol 10 (19) ◽  
pp. 6758
Author(s):  
Evgeny Mikhailov ◽  
Stanislav Semenov ◽  
Sergii Kliuiev ◽  
Ján Dižo ◽  
Miroslav Blatnický ◽  
...  
Keyword(s):  
Support Surface ◽  
Relative Rotation ◽  
Friction Forces ◽  
Slippage Rate ◽  
Common Axis ◽  
Design Scheme ◽  
Axis Of Rotation ◽  
Traditional Design ◽  
Curved Track

The article presents the continuation of studies of the features of the wheel movement the traditional and perspective constructive scheme on a rail. Unlike the traditional design, the perspective constructive scheme of the wheel allows independent relative rotation of the support surface wheel and of its guide surface (flange) relative to their common axis of rotation. Previous authors’ works did not take into account the influence of the level of slippage in the main contact of the wheel with the rail on the value of the slippage rate in its flange contact. This article further examines the influence of this factor for both wheel designs. The results of the presented studies confirm the possibility of reducing slippage in the flange contact with the rail for a wheel of a promising design scheme in comparison with a traditional wheel. Reducing the power of friction forces in the contact of the wheel flange of a promising design scheme will reduce the resistance to movement of such a wheel along the rail, especially in curved track sections.

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