Improving the sheared edge in the blanking of commercial AZ31 sheet through texture modification

Nürnberg, G.; Xie, Jing; Scherer, Daniel; Ersoy-Nürnberg, Kivilcim; Golle, Roland; Bohlen, Jan; Fuskova, L.; Letzig, Dietmar; Hoffmann, Hartmut

doi:10.1016/j.jmatprotec.2011.06.022

Cited by 14 publications

(5 citation statements)

References 10 publications

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“…However, across the temperature range 150–250 °C, non-basal deformation that significantly improves material ductility is activated [10]. In this regard, Nürnberg et al [11] examined the blanking of magnesium alloy sheets and observed an improved sheared edge quality through the texture modification of the AZ31 sheet. Similarly, Scintilla et al [12] investigated fiber laser cutting of AZ31 sheets and determined the ample cutting-edge quality of the workpiece.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Sheared Edges in Warm Blanking of Magnesium Alloy AZ31B

Fazily

Lee

2019

Materials

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This research aims to characterize damage at the sheared edge caused by the blanking operation of magnesium alloy AZ31B sheets. Shearing tests were carried out on an in-house blanking die-set and mechanical press (universal testing machine) by varying punch–die clearance and temperature. Edge damage was distinguished by the geometrical features of the sheared edge and by the distribution of the edge strain hardening (ESH) index. In this account, optical microscopy and scanning electron microscopy were applied to examine the characteristic dimensions of the sheared edge, fracture profile, and sheared edge quality, while the Vickers hardness test was applied to observe the surface micro-hardness in the shear zone (SZ) and the shear affected zone (SAZ). It was concluded that the blanking of magnesium alloy sheets at room temperature results in sheared edge defects, due to premature fracture, referred to here as micro-cracks, loose particles, and a jagged-plus-curved fracture profile. However, such deformities were completely suppressed with the rise in temperature. In addition, based on optical morphology, micro-hardness tests, and microstructure evolution, the recommendation regarding blanking temperature for the magnesium alloy AZ31B has was proposed.

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Section: Introductionmentioning

confidence: 99%

Characterization of Sheared Edges in Warm Blanking of Magnesium Alloy AZ31B

Fazily

Lee

2019

Materials

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“…In 2005 Hilditch and Hodgson, and others [2] first concluded that there were jagged defects in the shear section of AZ31B at room temperature; in the same year, Bogon and others [3] concluded that loose granular debris in the shear section could lead to more severe surface defects in the sheet during further processing and reduce corrosion resistance. In 2011 Nürnberg and others [4] improved the quality of shear sections by applying compressive stresses in a direction parallel to the plane of the AZ31B sheet and using a lattice reorientation mechanism to achieve modifications to the local substrate weave and improve the formability of the sheet in the ND (vertical) direction. In 2013 Scintilla and others [5] carried out experiments on fiber laser cutting of thin AZ31B sheets and determined relevant process parameters.…”

Section: Introductionmentioning

confidence: 99%

Predictive assessment of the ultrasonic shearing quality of AZ31B magnesium alloy sheet based on coupled vibration-thermal model

Meng¹,

Ma²,

Wang

et al. 2023

Preprint

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Introducing ultrasonic vibration into the shearing process of hard-to-deform magnesium alloy sheets shows the potential to solve the problems of poor-quality sheet sections and excessive burrs. In this paper, for the AZ31B magnesium alloy sheet, the method of constructing a converter to connect the displacement and vibration reference points is used to establish an ABAQUS three-dimensional ultrasonic vibration shearing simulation analysis model. Furthermore, the processing characteristics of ultrasonic shearing are described by analyzing the equivalent stress. Subsequently, the influence weight coefficients of three factors, sheet temperature, shear edge clearance, and ultrasonic amplitude, and the influence law of the above factors on the change of stress in ultrasonic shearing processing, are studied using the orthogonal test method. The results show that, since ultrasonic vibration can produce intermittent contact and ultrasonic energy softening effect on magnesium alloy sheets, shear processing equivalent stress appears as the phenomenon of stress superposition and fluctuation. Therefore, the equivalent stress of ultrasonic shearing under the same process parameters is less than that of conventional shearing. Moreover, ultrasonic shearing processing of magnesium alloy sheets through the plastic deformation phase for an extended time improves the quality of the shear section. The process parameter with the most significant influence factor in ultrasonic shearing is the sheet temperature, followed by the shear edge clearance and the smallest ultrasonic amplitude. This paper can provide quantitative guidance for the predictive assessment of the ultrasonic shearing quality of the AZ31B magnesium alloy sheet.

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“…The comprehensive studies of improving the room temperature formability of Mg alloy sheet were performed on the texture control. [10][11][12][13][14] A new element in our design is that an asymmetric extrusion die conducts a chamfer on one side to introduce an asymmetry shear deformation into bulk billets, which puts a lesser demand on the tooling. Shear events take place during a single extrusion processing step of strain paths associated with the novel integrated processing.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical behaviour of asymmetric extruded Mg–3Al–1Zn alloy sheets

Yang

Jiang

Dai

et al. 2013

Materials Science and Technology

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Microstructural evolution and mechanical responses of Mg-3Al-1Zn (AZ31) sheet processed by the asymmetric extrusion (ASE) and conventional extrusion (CE) are examined. Mechanical properties of ASE sheets were remarkably enhanced compared with CE samples. This is attributed to the subdivision of the asymmetric extrusion die along the flow passage equipped with a chamfer on one side, which would trigger the angular spread of the basal texture by introducing an asymmetry shear deformation. Moreover, subsequent annealed ASE specimens show a significant weakening of the basal texture and a combination of the superior stretch formability.

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Improving the sheared edge in the blanking of commercial AZ31 sheet through texture modification

Cited by 14 publications

References 10 publications

Characterization of Sheared Edges in Warm Blanking of Magnesium Alloy AZ31B

Characterization of Sheared Edges in Warm Blanking of Magnesium Alloy AZ31B

Predictive assessment of the ultrasonic shearing quality of AZ31B magnesium alloy sheet based on coupled vibration-thermal model

Microstructure and mechanical behaviour of asymmetric extruded Mg–3Al–1Zn alloy sheets

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