The rolling coefficients of metal powders

Виноградов, Г. А.; Katashinskii, V. P.

doi:10.1007/bf00774645

Cited by 5 publications

(6 citation statements)

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“…Since it is difficult to make compact parts from powder titanium by hot working in vacuum [5][6], cold rolling of powders seems to be quite a cheap and competitive method as compared with other processes. The papers [7][8][9][10][11][12] consider the production of compact titanium parts by titanium powder rolling and demonstrate that a compact titanium strip with adequate properties can be made. However, they either propose too complex conditions (sixfold reduction, fivefold vacuum heating) [11] to reach adequate strength and plasticity or do not justify the pressing and sintering conditions selected but rather focus on the production of long-length parts with adequate properties [12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of powder titanium at different production stages. V. Properties of a titanium strip produced by powder rolling

Gogaev

Nazarenko

Voropaev

et al. 2009

Powder Metall Met Ceram

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A method for producing strips by titanium powder rolling is proposed. The effect from powder annealing on the porosity of the initial billet is analyzed. The optimal temperatures of sintering and annealing after intermediate rolling are determined. It is shown that, under the optimal deformation conditions, the strip has mechanical properties that compare well with those of strips produced conventionally.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties of powder titanium at different production stages. V. Properties of a titanium strip produced by powder rolling

Gogaev

Nazarenko

Voropaev

et al. 2009

Powder Metall Met Ceram

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“…3). This is attributed to the gas phase squeezed out from the powder when it rolled [1,2] and to the flowability of the powder. The air squeezed out from the powder moves in the direction opposite to rolling and complicates powder supply to the compaction area, thus impairing roll biting.…”

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Binary mixtures of ultrafine metal powders. II. Rolling of ultrafine powders into porous sheets

Lyushinskii¹

2008

Powder Metall Met Ceram

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The paper examines the possibility of producing porous sheets by rolling binary mixtures of ultrafine powders of nickel, copper, and cobalt. The effect of the rolling rate on the thickness and porosity of sheets and on the specific surface area of powders after rolling is studied. The best rollability is shown by nickel and copper powders and by powders produced from mechanical mixtures of formates.Ultrafine powders of metals and their mixtures produced by the thermal decomposition of formates are generally rolled into porous sheets with needed porosity θ, thickness τ, and surface roughness R a . This paper examines the production of thin porous sheets from ultrafine powders of nickel ( Fig. 1a), copper, and cobalt, and binary mixtures of these powders resulting from the thermal decomposition of formates of mixtures and mechanical mixtures of formates (Fig. 1b, c).Ultrafine powders and their mixtures were rolled using a YuD 2200 rolling mill (Fig. 2) with horizontal work rolls 25 mm in diameter. The diameter of the backup rolls is 250 mm and their length is equal to that of the working rolls. The linear rolling speed V r = 190, 470, 790, and 1570 mm/min was increased incrementally. In the experiment, the initial gap between the rolls was constant and equal to 40 µm; their surfaces had roughness of 0.04-0.02 µm after mechanical treatment and finishing. Note that the rougher the roll surfaces, the rougher the sheet and the higher its activity in sintering with the surfaces of compact materials. In our case, roughness of the sheet was 0.32-0.16 µm.The thickness and porosity of the sheet decrease with increasing rolling speed (Fig. 3). This is attributed to the gas phase squeezed out from the powder when it rolled [1,2] and to the flowability of the powder. The air squeezed out from the powder moves in the direction opposite to rolling and complicates powder supply to the compaction area, thus impairing roll biting. A larger amount of powder enters the deformation area at a lower rolling speed. The sheet thickness increases, and so is the time during which powder particles are subjected to the pressing force between the work rolls.

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“…Known a device for force feeding of non-compact material (powder) into the rolls of rolling mill and rolling it in horizontal direction as a metal strip [1], consisting of a bunker a container and auger with a drive and setpoint block. Due to the pressure generated by auger in the container, the device sequentially seals, and moves metal material and through setpoint block send it to the rolls located in a horizontal plane.…”

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“…For sustainable process of compaction in the prechamber necessary that coefficient of material compaction k у ranges between 3 to 5 [1], that is the ratio of the cross sectional area F 1 working cavity of prechamber diameter D by logging in to the granular material and cross sectional area F 0 compacted rectangular billet output from it equal For sustainable process of compaction in the prechamber necessary that coefficient of material compaction k у ranges between 3 to 5 [1], that is the ratio of the cross sectional area F 1 working cavity of prechamber diameter D by logging in to the granular material and cross sectional area F 0 compacted rectangular billet output from it equal Having expressed the value F 0 through the height of caliber in the smallest section h min which implements the maximum compression ε during rolling, get…”

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confidence: 99%

“…(2) For sustainable process of compaction in the prechamber necessary that coefficient of material compaction k у ranges between 3 to 5 [1], that is the ratio of the cross sectional area F 1 working cavity of prechamber diameter D by logging in to the granular material and cross sectional area F 0 compacted rectangular billet output from it equal Substituting formula (2) into equality (1) and taking into account that to ensure relizability of process combined rolling-extruding [4] compression in rolling should be at least 50 % (ε = 0,5), obtain as a result that diameter of the prechamber on the border of the container, where begins forming billet, must be chosen from the ratio Having expressed the value F 0 through the height of caliber in the smallest section h min which implements the maximum compression ε during rolling, get 0 min…”

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Adaptation of Method Combined Rolling-Extruding for Production of Semi-Finished Products from Graded Waste Chip of Aluminum Alloys

Загиров¹,

Zagirov²,

Sidelnikov³

et al. 2015

J. Sib. Fed. Univ. Eng. technol.

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The rolling coefficients of metal powders

Cited by 5 publications

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Mechanical properties of powder titanium at different production stages. V. Properties of a titanium strip produced by powder rolling

Mechanical properties of powder titanium at different production stages. V. Properties of a titanium strip produced by powder rolling

Binary mixtures of ultrafine metal powders. II. Rolling of ultrafine powders into porous sheets

Adaptation of Method Combined Rolling-Extruding for Production of Semi-Finished Products from Graded Waste Chip of Aluminum Alloys

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