Simulational and experimental determination of the exploitation parameters of a screw conveyor

Karwat, B.; Rubacha, Piotr; Stańczyk, Emil

doi:10.17531/ein.2020.4.18

Cited by 21 publications

(22 citation statements)

References 17 publications

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“…The compaction unit is a particularly important unit among the systems for pressurized agglomeration [ 54 , 61 , 66 ]. A very important element of a properly conducted agglomeration is effective preparation of the material and its dosing [ 67 , 68 ]. The briquette forming process takes place between two rollers, which rotate in mutually opposite directions and on the surfaces of which there are molding cavities distributed in a proper way [ 69 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

Bembenek

Uhryński

2021

Materials

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The unit pressure in the fine-grained material consolidation process in the roller press can reach over hundred MPa and is a parameter which results, among other things, from the properties of the consolidated material and the compaction unit geometry. Its value changes depending on the place on the molding surface. Generating different pressure on the surface of briquettes makes their compaction different. One’s own and other researchers’ experience shows that, in the case of exerting high pressure on the merged fine-grained material, the higher unit pressure exerted on the material, the higher temperature of the consolidated material is. The temperature distribution on the surface of the briquettes can testify the locally exerted pressure on the briquette. The stress distribution in the briquetting material is still a subject of research. The article includes thermography studies of the briquetting process of four material mixtures. Thermal images of briquettes were taken immediately after they left the compaction zone as well as forming rollers. The obtained thermograms and temperature variability at characteristic points of the surface of briquettes were analyzed. The correlation between the temperature distribution and the stress distribution in the briquettes was determined.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

Bembenek

Uhryński

2021

Materials

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“…In the case of materials with a fine-grained structure, including chips, in order to reuse them, it is preferable to give them the appropriate geometry [ 11 ]. It should, first of all, allow for their easy and economical transport [ 12 ], storage or dosing to processing devices [ 13 ], as well as ensuring appropriate process management in processing units [ 14 ]. One of the materials that as a waste from the machining process can rationally be reused are copper and copper alloys.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of the Morphology of the Saddle-Shaped Bronze Chips Briquettes Produced in the Roller Press

et al. 2021

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This paper presents the results of the investigations of the properties of saddle-shaped copper alloy chips briquettes produced in a roller press. The physical and mechanical properties of the investigated briquettes were examined on their external surfaces as well as on their cross-sections. The density, chemical composition, microstructure analysis obtained with a 3D and scanning microscope, surface roughness and hardness of the obtained briquettes were investigated. The research proved the differentiation of the physical and mechanical properties of briquettes depending on the investigated area of their surface. The analysis of changes in the porosity of briquettes on their cross-section showed zones of various densification levels. This research expands the knowledge of the processes taking place during the compaction and consolidation of granular materials in roller presses as well as the knowledge concerning designing the geometry of forming tools.

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“…It consists of putting the material under pressure, causing the grains to be closer to one another, and forming diverse bonds to make the material stronger [ 18 ]. A very important element of a properly conducted agglomeration is effective preparation of the material [ 11 , 13 , 19 ] and its dosing [ 17 , 20 , 21 ]. The pressurized agglomeration process produces compact shapes with relatively low porosity and specific mechanical strength [ 6 , 12 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

The Wear on Roller Press Rollers Made of 20Cr4/1.7027 Steel under Conditions of Copper Concentrate Briquetting

2020

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This paper defines the wear process of rollers made of 20Cr4. Rollers with a diameter of 1000 mm were installed in a roller press used for the production of drop-shaped briquettes and the copper concentrate was briquetted for 1100 h. Three-dimensional (3D) geometry analysis, metallographic analysis, macroscopy, scanning electron microscopy, as well as hardness measurements were performed. It was observed that the working surface was non-uniformly worn. The smallest wear affects the molding cavities situated on the outermost edges of the ring. The wear increases as the center of the ring is approximated, and it reaches its maximum at the middle of the ring. The molding cavities also wear asymmetrically. For the shape considered in this study, the lower part of a cavity is subject to a higher wear rate. We found that the material of the working ring was carburized, but its hardness was significantly lower than required. The roller ring microstructure changes depended on the distance from the cavity’s face. An investigation of the wear mechanisms showed different types of abrasive wear, corrosive processes, and plastic deformation. The exact type and course of wear were described, depending on the location on the working surface.

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Simulational and experimental determination of the exploitation parameters of a screw conveyor

Cited by 21 publications

References 17 publications

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

Analysis of the Temperature Distribution on the Surface of Saddle-Shaped Briquettes Consolidated in the Roller Press

The Analysis of the Morphology of the Saddle-Shaped Bronze Chips Briquettes Produced in the Roller Press

The Wear on Roller Press Rollers Made of 20Cr4/1.7027 Steel under Conditions of Copper Concentrate Briquetting

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