Experimental Results of Pressing and Cold Deformation for the Development of New Pipe Products

Kosmatskii, Ya. I.; Barichko, B. V.; Yakovleva, K. Yu.; Fokin, N. V.; Nikolenko, V. D.

doi:10.3103/s0967091220120062

Cited by 1 publication

(2 citation statements)

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“…To estimate optimal viscosity of a glass lubricant for tube extrusion, the technical literature [1][2][3] considers the hydromechanical problem of the fl ow of a Newtonian viscous fl uid in a converging channel. In this case, the optimal viscosity value is directly proportional to the lubricant fi lm thickness and deformation resistance of metal and is inversely proportional to the rate of fl ow of the extruded product (Prozorov L. V., 1969).…”

Section: Defi Ning Thementioning

confidence: 99%

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Estimation of glass lubricant viscosity for hot extrusion of Cr-Ni steel and Ni alloy tubes

Medvedev¹,

Shyfrin²,

Frolov³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. Estimation of optimal viscosity of a glass lubricant for chromium-nickel steel tube extrusion depending on the deformation resistance, chemical composition of metal and the temperature, degree and rate of deformation. Methodology. To determine the force conditions for tube extrusion, a complex factor of deformation resistance was used, which consists in estimating the value of deformation resistance under the basic process parameters of extrusion plants and its refinement depending on the deviations of heating temperature and wall thickness of billets as well as the degree and rate of deformation from the base conditions. Findings. The dependence of basic values of deformation resistance on the percentage of alloying elements (Ni + Cr) in steels has been found. With the addition of hardening alloying elements (Mo, W, V, Nb) into the alloy steel, its deformation resistance increases in proportion to their percentage. Analytical expressions for calculating the base values of deformation resistance for different extrusion plants have been obtained. Originality. For the first time, the principles governing estimation of the optimal viscosity of glass lubricants based on the chemical composition of steel to be formed, its temperature and the degree and rate of deformation of the blank, thickness of the lubricating layer and geometric dimensions of the tool (die) in hot extrusion of tubes have been established. Practical value. The use of the results of calculation according to the developed method will make it possible to increase the surface quality of tubes manufactured by extrusion and reduce the volume of their subsequent machining.

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Section: Defi Ning Thementioning

confidence: 99%

“…The technical literature proposes a number of dependences to estimate optimal viscosity of glass lubricants, a detailed analysis of which is provided in the works by Prozorov L. V. (1969). The issues of modeling a steel tube extrusion process using metal working lubricants are discussed in the works [3,4].…”

Section: Introductionmentioning

confidence: 99%