Contact problems of the theory of roller squeezing of leather

Analytical dependencies are determined that describe the patterns of change in filtration rates in the squeezing area. It was established that the fluid filtration rate along the abscissa axis at the boundaries of the compression zone is zero, and inside the zone, it takes negative values. It was found that the fluid filtration rates along the ordinate axis are zero at the beginning of the compression zone; they increase to a maximum at a point lying on the line of centers, and in the zone of strain restoration, they depend on the angle that determines the position of the point where the fluid changes direction.

Section: Methodsmentioning

confidence: 99%

“…Depending on the roll design of the squeezing machine and its coating, point 4 A can coincide with any point of the strain restoration zone [9,10,13].…”

Section: Methodsmentioning

confidence: 99%

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Filtration velocity under roller squeezing

Хуррамов

Khalturaev²,

Kurbanova³

2023

“…In [10][11][12][13]17,[32][33][34][35][36][37], the analytical description of the contact shape of the roll module is associated with a power-law empirical relationship between the stress and strain of the materials of contacting bodies, obtained experimentally.…”

Section: Introductionmentioning

confidence: 99%

Shape of contact between deformable material and elastic rollers

Khurramov,

Sattorova,

Turdibekova

et al. 2024

Self Cite

The study is devoted to the analysis of the contact shape in a symmetrical roll module for the case when changes in the thickness of the material and the roller coating at each point of the contact zone occur in the vertical direction of the strip of material. A mathematical model of the shape of contact between a deformable material and elastic rollers is developed. Particular types of mathematical models of the contact shape are obtained in cases where the material being processed is absolutely elastic, elasticviscous, and plastic. It was revealed that the shape of the contact depends primarily on the geometric and deformation properties of the strip of material being processed and the roller coating, and the deformation rate.

“…References [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] are devoted to mathematical modeling of the roll pressing process. Analytical expressions for the contact area of the rolls and specific pressure are determined on the basis of modeling the shape of the roll contact curves and the distribution patterns of contact stresses.…”

Section: Introductionmentioning

confidence: 99%

Specific pressure under roller squeezing of leather

Turgunov

Aliboev²,

Хуррамов³

2023

The influence of factors on the width of the roller contact and the specific pressure under roller pressing of leather is analyzed in the article. As a result of experimental studies, the dependences of the width of the contact area and specific pressure on the intensity of the load, velocity, and diameter of the rollers were determined. It was revealed that the parameter of the technological specific pressure on the hide in the contact zone increases with an increase in the intensity of the load, the speed of rolls, the width of the contact area, and a decrease in the radius of rolls. An analytical dependence of the residual moisture content of leather on the specific pressure was determined. It was established that with an increase in specific pressure, the residual moisture content of leather decreases and asymptotically approaches a certain value of the function.