Surface-crack formation in the manufacture of microalloyed steel pipe

Колбасников, Н. Г.; Мишин, В. В.; Shishov, Ivan; Matveev, M.; Korchagin, A. M.

doi:10.3103/s0967091216090035

Cited by 15 publications

(5 citation statements)

References 3 publications

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“…A relatively small effective deformation is observed near the lower base of the formed truncated cone in the first stage, as well as in the upper part of the flange after the third stage. In these zones, predominantly tensile stresses act, which can lead to the appearance of defects [25] in the form of cracks if we continue the process of rolling.…”

Section: Resultsmentioning

confidence: 99%

Angular Rolling of the Hollow Flanges of Pipe Joints

Kononov

Ignatiev

Levashov

et al. 2021

Metals

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The paper considers a three-stage technology for angular rolling of the pipe workpiece. This technology facilitates the expansion of the range of flange parts available by eliminating a number of drawbacks of the known methods of metal forming. In the presented paper, we analyze the results of numerical calculations and experiments, as well as the effective deformation values in blank material, using computer simulation in the DEFORM-3D software package. The results of the computer simulation were reached taking into account experimental studies of the rheological properties of copper alloy L68 in the form of a strain hardening curve using the Instron-8850 complex. The results of the ratio of basic geometric dimensions expanded the range of flange parts under investigation and allowed us to consider angular rolling technology with a variable angle of inclination of the rolling roll from a three-stage perspective, especially in small-scale production.

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Section: Resultsmentioning

confidence: 99%

Angular Rolling of the Hollow Flanges of Pipe Joints

Kononov

Ignatiev

Levashov

et al. 2021

Metals

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“…The criterion is based on calculating the potential energy of plastic deformation, i.e. the area of the shape bounded by the strain -stress curve [12][13][14][15][16][17][18][19][20]. For fig.…”

Section: Analysis Of Results and Formulation Of Technical Recommendat...mentioning

confidence: 99%

Evaluation of the Effect of Holding the Mandrel in the Extreme Position of the FQM Mill on the Formation of Surface Defects

Toporov

Khalezov

Нухов

2021

SSP

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Modern continuous mills FQM are high-performance technological units that allow you to get products of a wide range. The paper presents the results of the study of the effect of the time of holding the mandrel in the extreme position of the continuous mill FQM (Fine Quality Mill) on the probability of defect formation of surface defects. The problems of сcomputational simulation of the process of continuous rolling of pipes were set and solved. It is established that the increase in the holding time of the mandrel allows to reduce the sliding of the metal on the surface of the tool, and contributes to a stable process of removing the mandrel without the formation of defects on the inner surface of the draft pipe. The results of solving the problems of сcomputational modeling allowed to formulate technical recommendations aimed at reducing the probability of surface defects in the production of pipes at the FQM mill.

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“…where [17,18], that includes stretching the pieces before destruction at the Gleeble-3800 complex and finite-element modelling of the piece stretching before the process of destruction. While modeling the conditions of the sample stretching, a rigidplastic medium with hardening was adopted as a model of the process material.…”

Section: Experimental-calculation Estimation Of the Cockcroft-latham Fracture Criterion Critical Damage Valuementioning

confidence: 99%

Computer simulation of deformation and fracture conditions during the detail rolling with a flange with inclined rolls

et al. 2021

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An adequate computer model of the process of rolling flange details with inclined rolls has been built in the software package DEFORM-3D. The analysis of the stress-strain state of a detail with a flange was performed. The rheological properties of the alloy L63 (62-65% Cu, 34.5-38% Zn) were experimentally studied. Value limits of the Cockcroft-Latham fracture criterion for the alloy L63 are determined.

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Surface-crack formation in the manufacture of microalloyed steel pipe

Cited by 15 publications

References 3 publications

Angular Rolling of the Hollow Flanges of Pipe Joints

Angular Rolling of the Hollow Flanges of Pipe Joints

Evaluation of the Effect of Holding the Mandrel in the Extreme Position of the FQM Mill on the Formation of Surface Defects

Computer simulation of deformation and fracture conditions during the detail rolling with a flange with inclined rolls

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