Influence of exit velocity distribution on self-bending extrusion

Min, Fanlei; Zhu, Guangming; Yue, Bowen; Wang, Zongshen; Yang, Zhenyu; Zhai, Xiaoqing

doi:10.1088/2631-8695/ab7154

Cited by 5 publications

(3 citation statements)

References 23 publications

(27 reference statements)

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“…On the other hand, porthole dies are being popularly used for production of hollow profiles. Numerical simulations were taken up to produce profile with uniform velocity distribution by making design modifications in porthole dies [25][26][27][28]. Research work reported by Zhang et al [29] and Yi et al [30], indicated that friction at selective regions was varied by incorporating baffle plates for controlling of metal flow in order to achieve velocity uniformity in a profile produced by porthole die.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on AA6063 extrudates: effect of number of portholes on extrusion load and weld strength

Ammu,

Padole,

Agnihotri

et al. 2024

Eng. Res. Express

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In aluminium extrusion process, metal flow is greatly controlled by the die geometry and a variety of intricate profiles can be achieved by designing dies of different configurations. In porthole die extrusion, number of portholes used for a profile is often determined by the subjective knowledge of designers. Nevertheless, extrusion load and weld strength of profile produced are not only dependent on extrusion ratio, temperature of deformation but also on the number of portholes along with other die geometry variables. In the present investigation, systematic studies were carried out on three different dies with four ports, three and two ports around die center to extrude profiles of outer diameter 29.4 mm and thickness 2mm. Numerical simulations were carried out for estimation of pressure, temperature, strain, and strain rate parameters in the weld chamber for all the dies, followed by press trials and profiles produced were subjected to wedge expansion test. The results from numerical simulations indicated that pressure generated inside weld chamber increases with number of portholes. The surface plots indicated highest pressure of about 280 MPa for four port hole and about 276 MPa for three ports die and pressure of about 160 MPa was estimated for two port hole die at the entry of weld chamber , which is 65mm from profile end. Similarly, temperature at profile exit was 551 0C for four portholes die and 546 0C for three portholes die and 537 0C for two portholes die. Furthermore, press trials indicated peak extrusion loads of 5241 kN, 4406 kN and 3961 kN respectively for four, three and two portholes die. Thus, the peak extrusion load decreased by about 16 % for three port and about 25 % for two ports die in comparison with four port die. Also, the extruded profiles in wedge expansion test indicated mean compression load of 22.70±0.14 kN in four porthole die, mean compression load 22.29±0.26 kN for three port die and mean compression load of 17.841± 0.27 kN.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on AA6063 extrudates: effect of number of portholes on extrusion load and weld strength

Ammu,

Padole,

Agnihotri

et al. 2024

Eng. Res. Express

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“…Other parameters such as friction condition and location of holes on the multi-hole dies were investigated to determine the extrusion load and extruded product profiles [11][12][13][14]. The bending of exit profiles of extruded products also depends of the velocity distribution [15]. The literature reveals that the previous research findings on multi-hole extrusion are limited to circular profile products except for some exceptions.…”

Section: Introductionmentioning

confidence: 99%

Study of Orientation of Triangular and Square die hole profiles on Extrusion Load in Multi-hole Extrusion process

Sahu,

Das,

Routara

et al. 2023

E3S Web Conf.

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The multi-hole extrusion process is an extrusion process with a die having more than one hole. The multi-hole extrusion process is used to extrude more than one product from the same billet with less extrusion load. Different die profiles are used to get different extruded profiles as per the need. Different profiles such as circular, triangular, square etc., are used. The symmetric die hole profiles are easy to fabricate on the extrusion die but the location and positioning of other types of hole profiles like triangular and square need attention as they cause different material flow behavior during material flow. In the present study, triangular and square dies of 2-hole, 3-hole and 4-hole with different orientations of apex and edges have been used to study the extrusion load behavior. Both finite element analysis and experimental study reveals that square hole dies need less extrusion load than that of triangular ones.

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“…Chen et al [31] studied the effect of the process parameters on the shape of the extruded tube in the multi-hole extrusion of aluminium alloy tubes by both FE-based analysis and experimental methods. Min et al [32] used the Arbitrary Lagrangian-Eulerian method to simulate the natural bending deformation of the sheet metal. A self-bending extrusion die for a workpiece was designed via a spline curve, with an inclination as the contour of the deflector chamber.…”

Section: Introductionmentioning

confidence: 99%

Non-Symmetrical Direct Extrusion—Analytical Modelling, Numerical Simulation and Experiment

et al. 2021

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The article presents the original technology of the extrusion of hollow curved pipes. The curvature radius of pipe axis was obtained directly during extrusion by eccentric alignment of the annular calibration gap of the extrusion die. Theoretical relationships describing the radius of curvature of the extruded part as a function of the eccentricity e of position of the annular calibration gap in the die were developed. A die with replaceable inserts with eccentricity e equal to 1, 2, 3, 5, 7 mm was designed and fabricated. Experimental tests were carried out to extrude lead pipes with an outer diameter of 20 mm and an inner diameter of 18 mm. Measurements of the radii of the curvature of the extruded pipes were consistent with the values calculated from the developed theoretical relationships. Numerical modelling of the proposed method of extrusion in a finite element-based QForm 3D program was carried out. The finite element method (FEM) numerical calculations were carried out for lead. Numerical simulations and experimental studies have shown that, by changing the value of the eccentric gap, the radius of curvature of the extruded pipe can be controlled.

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Influence of exit velocity distribution on self-bending extrusion

Cited by 5 publications

References 23 publications

Numerical and experimental investigations on AA6063 extrudates: effect of number of portholes on extrusion load and weld strength

Numerical and experimental investigations on AA6063 extrudates: effect of number of portholes on extrusion load and weld strength

Study of Orientation of Triangular and Square die hole profiles on Extrusion Load in Multi-hole Extrusion process

Non-Symmetrical Direct Extrusion—Analytical Modelling, Numerical Simulation and Experiment

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