A study of the reinforcement technology used to improve the life of mandrel bars used in seamless tube manufacturing by mandrel mill rolling

Akiyama, M; Tsubouchi, Kenji; Hori, Hideo

doi:10.1243/1464420001544852

Cited by 1 publication

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“…In reference [2] the effects of abnormal formation of ferrite on austenite grains during the rolling of hot tubes are analysed. In references [3] and [4] the beginning of fracture on the mandrel tip during the manufacture of seamless tubes is studied. Here, laboratory tests and a numerical analysis suggest that fracture is induced by thermal shock.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical analysis of a piercing mandrel for the production of seamless steel tubes

Prince

Maroño

León

2003

Proceedings of the Institution of Mechanical Engineers, Part E:

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The heat transfer of a piercing mandrel for the production of seamless steel tubes is analysed, and the consequent thermal stresses are examined. The process of tube manufacture is described, and the problem to be addressed is identi ed. The analysis is based on a mathematical model with the essential boundary conditions, heat transfer coef cients in this case. For the solution of this mathematical model, the nite element method (FEM) is employed given the geometry of the tip of the mandrel and its initial and boundary conditions. The commercial software of the FEM employed makes it possible to nd the temperature elds of the mandrel tip, as well as the temperature histories of some points of interest, which agree with thermographic readings. Evaluation of the material, based on the temperature eld, shows that creep effects are important in wearing out of the mandrel tip and affect the number of tubes manufactured. Additionally, the methodology developed herein makes it possible to estimate the lifespan of the mandrel tip during the tube piercing stage, and to propose improvements for cooling of the mandrel tip.

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Section: Introductionmentioning

confidence: 99%