Analysis of the Energy Vanished by Friction in Tube Drawing Processes with a Fixed Conical Inner Plug by the Upper Bound Method

Rubio, Eva María; Camacho, Ana María; Marcos, M.; Pérez, Miguel Ángel Sebastián

doi:10.1080/10426910802317060

Cited by 13 publications

(15 citation statements)

References 9 publications

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“…The horizontal continuous and discontinuous lines represent the plate drawing limits for the rigid perfectly plastic material and for the theoretical work-hardening one, respectively. Those lines represent the limit-IMUT [3,4].…”

Section: Applications and Resultsmentioning

confidence: 99%

A Simplified Model for Assessing the Work-Hardening Effect in the Analysis of Plate Drawing Processes by Upper Bound Method

Rubio

Lobera

Marcos

et al. 2012

Journal of Manufacturing Science and Engineering

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This work presents an analysis of the plate drawing processes carried out in converging dies. The analysis has been made by the upper bound method (UBM), modeling the plastic deformation zone by triangular rigid zones (TRZ), and considering that the processes occur under plane strain and partial friction conditions. The goal is to evaluate how the work-hardening suffered by materials when they are cold-worked affects the energy required to carry out a certain process. In order to achieve this objective, the paper proposes a simplified model for calculating the shear yield stress, k, aiong the contact surface between die and material when theoretical work-hardening materiais are used. The results obtained with this simplified procedure do not differ significantly fi-om those obtained with the complete model, even in the more drastic conditions tried. This resuit confirms that the simplified model can successfully substitute for the complete model with less calculation.

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Section: Applications and Resultsmentioning

confidence: 99%

A Simplified Model for Assessing the Work-Hardening Effect in the Analysis of Plate Drawing Processes by Upper Bound Method

Rubio

Lobera

Marcos

et al. 2012

Journal of Manufacturing Science and Engineering

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“…The internal friction surface is the zone of simultaneous reduction of the diameter, the wall of the tube, and the surface of the cylindrical part of the plug in the calibration zone (Figure 1). The work of frictional forces on the above-mentioned surfaces is completely transformed into heat, resulting in a local increase in the temperature of the drawing die, tube, and floating plug, as well as the lubricating film on the outer and inner surfaces of the tube [6,7]. The intensity of the heat released is a function of the following factors [8,9]:…”

Section: Introductionmentioning

confidence: 99%

Cold Drawing of AISI 321 Stainless Steel Thin-Walled Seamless Tubes on a Floating Plug

Żaba,

Trzepieciński

2023

Materials

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The paper presents the results of an analysis of the process of drawing AISI 321 stainless steel thin-walled seamless tubes on a floating plug. The influence of the geometry of dies and plugs, drawing velocity, and lubricants on the possibility of carrying out the pipe drawing process without a loss of strength of the lubricating film and, consequently, disturbance of the forming process and tube cracking, and also on the temperature in the drawing process, the mechanical properties of the tubes drawn, and the microhardness and roughness of the inner and outer surface of the tubes was investigated. The parameters of the drawing tools used were as follows: angle of drawing dies α = 16° and floating plugs with angles of inclination of the conical part of the plug β = 11.5°, 13°, and 14°. The drawing dies and floating plugs were made of G10 sintered carbide. Drawing speed was varied over the range 1 to 10 m/min. The study used several lubricants. Tubes with dimensions (outer diameter D0, wall thickness g0 before drawing process) D0 = 19 mm, g0 = 1.2 mm and D0 = 18 mm, g0 = 1.2 mm were drawn to produce tubes with dimensions (outer diameter Dk, wall thickness gk after drawing process) Dk = 16 mm, gk = 1.06 mm on a drawbench with the same total elongation, while the diameter and wall thickness were changed. During the process, continuous measurements were made of the drawing force and temperature in the deformation zone and on the tube surface. It was found that the drawing process causes a decrease in the roughness parameters Ra and Rz of the inner surface of the tubes. Moreover, after drawing, an increase of 30–70% was observed in the microhardness of the tube material in relation to the microhardness of the charge material. Based on the test results, it can be concluded that the work of frictional forces is the main direction of optimization of tube drawing on a floating plug process of hard-deforming materials.

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“…Moon et al [18] evaluated the operating parameters that lead to uniform strains distribution (which is the optimal pattern that minimizes the chance to exceed the formability limit of the material) in two-pass tube drawing processes (in this case, the analytical results were confirmed with those provided by finite element simulations). Rubio et al [19,20] studied via the upper bound method the thin-walled tube drawing process in conical converging dies with inner plugs with the aim of finding the optimal operating parameters that enables the process to be carried out using the minimum energy. Similarly, Kwan [21] assessed the influence of various operating parameters on the drawing stress for tube drawing with arbitrarily curved both die and plug (no comparison with neither finite element nor experimental results has been considered in the last two works).…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experimental Validation of Tube Sinking Drawing Processes

Celentano

Rosales

Peña

2011

Materials and Manufacturing Processes

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This artice presents an exhaustive analysis of the mechanical behavior of a steel tube during its sinking drawing. The methodology consisted in three stages, respectively, devoted to tensile testing, tube drawing in laboratory at different strain rates and, finally, mechanical characterization via modelling and simulation of the material behavior in these two tests. The derivation of the material parameters accounting for both isotropic hardening and rate-dependent effects is particularly addressed. The obtained numerical results are satisfactorily validated with the corresponding experimental measurements. Finally, a sensitivity study of the effect of the die entry semiangle on the drawing force and residual stresses is also performed in order to illustrate the capability of the methodology as a useful tool, depending on the further application of the tube, for die design.

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Analysis of the Energy Vanished by Friction in Tube Drawing Processes with a Fixed Conical Inner Plug by the Upper Bound Method

Cited by 13 publications

References 9 publications

A Simplified Model for Assessing the Work-Hardening Effect in the Analysis of Plate Drawing Processes by Upper Bound Method

A Simplified Model for Assessing the Work-Hardening Effect in the Analysis of Plate Drawing Processes by Upper Bound Method

Cold Drawing of AISI 321 Stainless Steel Thin-Walled Seamless Tubes on a Floating Plug

Simulation and Experimental Validation of Tube Sinking Drawing Processes

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