The influence of tool geometry on the course of flanges radial extrusion in hollow parts

Winiarski, Grzegorz; Gontarz, A.; Dziubińska, Anna

doi:10.1016/j.acme.2017.04.002

Cited by 21 publications

(20 citation statements)

References 14 publications

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“…The simulations were made in Deform-3D. This software has been effectively used in previous studies to investigate metal forming processes [9][10][11]. The simulations were performed on material models of aluminium alloys obtained from the software's material database.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Deformability of Aluminium-Copper Casting Alloys

Winiarski¹,

Dziubińska²,

Majerski³

et al. 2018

Adv. Sci. Technol. Res. J.

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The paper presents the results of a numerical analysis and experimental tests investigating the deformability of castings made of two aluminium alloys: EN AW-2017A and EN AW-2024. Test specimens were produced by two casting methods: sand casting and permanent mould casting. The castings were first subjected to homogenizing annealing; afterwards, they were shaped into cylindrical specimens for an upsetting test. This test was conducted on a hydraulic press in the temperature range of 420-500˚C. Visual inspection of the specimens and examination of their microstructure were performed. Hardness of selected specimens was also measured. The study led to determination of the effect of the mould type on the deformability of the castings and the hardness of forgings obtained from these casting. Obtained results also became a basis for determining the forging temperature ranges for casting preforms made of the investigated aluminium alloys.

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Section: Methodsmentioning

confidence: 99%

Investigation of the Deformability of Aluminium-Copper Casting Alloys

Winiarski¹,

Dziubińska²,

Majerski³

et al. 2018

Adv. Sci. Technol. Res. J.

Self Cite

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“…Additionally, many researchers have stressed the importance of calculating strain hardening coefficients such as a strength coefficient, c, and a strain hardening exponent, n. They are particularly essential when selecting heat treatment technological parameters or elaborating metal forming technology for steel [22,23], aluminium alloys [24,25], magnesium alloys [26,27], pure copper [28], powder metallurgy materials [29,30] or plasticine [31,32] or even MMC materials [33,34]. Therefore, this paper investigates the effect of annealing on the strain hardening parameters, the c and n coefficients are determined and can be used in numerical simulations and experimental tests of 42CrMo4 steel components dedicated for metal forming [35,36].…”

Section: Introductionmentioning

confidence: 99%

Effect of Annealing Time and Temperature Parameters on the Microstructure, Hardness and Strain-Hardening Coefficients of 42CrMo4 Steel

Szala

Winiarski

Wójcik

et al. 2020

Preprint

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The study presents the effect of annealing process parameters on the microstructure, hardness and strain hardening coefficients i.e., the strength coefficient c and the strain hardening exponent n, of 42CrMo4 steel. Seven selected annealing time-temperature schemes are examined for superior steel formability in cold metal forming conditions. The c and n coefficients are first determined in experimental upsetting of annealed samples and then used in FEM simulations of the upsetting process. The results demonstrate that the strain hardening coefficients (c and n) depend on the employed annealing scheme. Compared to the as-received sample, the annealing process reduces the true stress and effectively decrease the hardness of 42CrMo4 steel, improves microstructural spheroidization and, consequently, facilitates deformability of this material. The annealing schemes relying on heating the material to 750 °C and its subsequent slow cooling lead to the highest decrease in hardness ranging from 162 to 168HV. Results obtained with the SEM-EDS, LOM and XRD methods lead to the conclusion that the employed heat treatment schemes cause the initial ferritic-pearlitic microstructure to develop granular and semi-lamellar precipitation of cementite enriched with Mo and Cr in the ferrite matrix. In addition, the annealing process affects the growth of α-Fe grains. The highest cold hardening rate, and thus formability, is obtained for the annealing scheme producing the lowest hardness. The results of FEM simulations are positively validated by experimental results. Obtained results are crucial for further numerical simulations and experimental research connected with developing new cold metal forming methods for producing parts made of 42CrMo4 steel.

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“…This process can also be used in the production of energy-absorbing structures [16]. Radial extrusion is suitable for forming parts with lateral protrusions or flanges from bars [17,18] or tubes [19,20]. A serious failure mode observed in this process is radial fracture of the flange caused by circumferential tensile stresses.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tool Kinematics on Tube Flanging by Extrusion with a Moving Sleeve

Winiarski¹,

Bulzak²,

Wójcik³

et al. 2019

Adv. Sci. Technol. Res. J.

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This paper presents the results of a numerical investigation into tube flanging by extrusion with a moving sleeve. Two cases of the extrusion process are investigated, each described with a different tool kinematics. Effects of flange diameter, gap height and tool motion on the extrusion process are examined. The numerical analysis is performed on 42CrMo4 steel tubes deformed at ambient temperature. Obtained numerical results are then used to determine metal flow patterns and examine force parameters in the extrusion process, as well as to determine a technological window for the investigated method.

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The influence of tool geometry on the course of flanges radial extrusion in hollow parts

Cited by 21 publications

References 14 publications

Investigation of the Deformability of Aluminium-Copper Casting Alloys

Investigation of the Deformability of Aluminium-Copper Casting Alloys

Effect of Annealing Time and Temperature Parameters on the Microstructure, Hardness and Strain-Hardening Coefficients of 42CrMo4 Steel

Effect of Tool Kinematics on Tube Flanging by Extrusion with a Moving Sleeve

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