Effects of die land on the cold extrusion of lead alloy

Ajiboye, Joseph S.; Adeyemi, M.B.

doi:10.1016/j.jmatprotec.2005.08.004

Cited by 21 publications

(13 citation statements)

References 5 publications

(14 reference statements)

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“…A computer program written in C++ language was used [23] to evaluate various components of Eq. (42) to determine dimensionless extrusion pressure.…”

Section: Methodsmentioning

confidence: 99%

“…Nanhai et al [22] stressed the importance of proper simulation of die land in the extrusion of shapes with flat-faced die so as to avoid the generations of geometrical defects and hence proposed a method of simulation, using finite element method, that the metal flow in extrusion and the die land can be adjusted according to the simulation results. Ajiboye and Adeyemi [23] improved on Kiuchi et al's formulations [21] to account for power losses due to ironing effect at the die land of an extrusion die with circular die opening. Their investigations involved the determinations of both experimental and theoretical effects of die land lengths on the quality of extruded products, extrusion pressures and flow patterns of coldextruded lead alloy of circular sections Avitzur [24] gave a detailed theoretical formulation which accounted for the power losses due to friction between the die land and round billets during drawing and extrusion processes to smaller rod products.…”

Section: Introductionmentioning

confidence: 99%

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Upper bound analysis of extrusion from square billets through circular and square/rectangular dies

Ajiboye

2009

J Mech Sci Technol

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Upper bound elemental technique (UBET) for prediction of extrusion pressure in three-dimensional forward extrusion process is presented. Using square/rectangular billets, the study of the effect of die land length has been extended for the evaluations of extrusion pressures to extrude sections such as circular, square and rectangular shaped sections with power of deformation due to ironing effect at the die land taken into account. The extrusion pressure contributions due to the die land evaluated theoretically for these shaped sections considered are found to increase with die land lengths for any given percentage reduction and also increase with increasing percentage die reductions at any given die land length. The effect of die land lengths on the extrusion pressures increases with increasing complexity of die openings geometry with rectangular section giving the highest extrusion pressure followed by circular with square section die opening, giving the least extrusion pressure for any given die reduction at any given die land lengths. The proper choice of die land length is imperative if excessive pressure buildup at the emergent section is to be avoided so as to maintain good quality and metallurgical structure of the extrudates.

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“…A computer program written in C++ language was used [23] to evaluate various components of Eq. (42) to determine dimensionless extrusion pressure.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Upper bound analysis of extrusion from square billets through circular and square/rectangular dies

Ajiboye

2009

J Mech Sci Technol

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“…He stated further that increase in land decreases the maximum possible reductions. Ajiboye and Adeyemi [9] had shown in their previous work that significant contribution to overall extrusion load! pressure is made at the die land due to ironing frictional effect.…”

Section: Heat Transfer Zones and Analysesmentioning

confidence: 98%

“…K aTn + C /::,,[ aT" + a = K aT" + c MaT" n ar P n n 2 at q "ar p"" 2 at (9) The solutions to the above governing Eq. (7) and energy balance (9) at their boundaries conditions are expressed in the finite difference forms as follows [9,10] 3.2 Energy balance at the interfaces with zones…”

Section: Temperature Increase At Undeformed/ Container Interfacementioning

confidence: 99%

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The effect of selected parameters on temperature distribution in axisymmetric extrusion process

Ajiboye

Adeyemi

2007

J Mech Sci Technol

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A numerical method was developed to simulate the transient temperature distributions during forward extrusion process. The computer program simulates the extrusion process and takes into account some extrusion variables such as extrusion velocity, extrusion ratio, die preheat temperature, and percentage reduction in area. It can be seen that the higher the percentages reductionin areas, the higher the temperaturerises during the extrusionprocess. Also, increasing speed of deformation shows an increasingdead zone temperature rise than a more gradual die land temperaturerise. It is further seen that extrusion temperatureincreaseis a function of the container temperature.

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Effect of TiO2 nanoparticle lubrication on precision forming

Xie

Ouyang

et al. 2023

Int J Adv Manuf Technol

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Effects of die land on the cold extrusion of lead alloy

Cited by 21 publications

References 5 publications

Upper bound analysis of extrusion from square billets through circular and square/rectangular dies

Upper bound analysis of extrusion from square billets through circular and square/rectangular dies

The effect of selected parameters on temperature distribution in axisymmetric extrusion process

Effect of TiO2 nanoparticle lubrication on precision forming

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