Analysis of sheared edge formability of aluminum

Le, Quochung; deVries, James A.; Golovashchenko, Sergey F.; Bonnen, John

doi:10.1016/j.jmatprotec.2013.11.021

Cited by 33 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found that hardening the punch and the die increased tool life when high strength sheet metal was being processed. Le et al [12] investigated the effects of cutting clearance on longitudinal, transverse and diagonal orientations of the trim line relative to the rolling direction on a broadly used aluminum alloy, 6111-T4. They found that for all the sheet orientations, an increase in the cutting clearance resulted in a substantial reduction in material stretchability along the sheared surface.…”

Section: H Gürün M Göktaş a Güldaş Experimental Examination Of Ementioning

confidence: 99%

Experimental Examination of Effects of Punch Angle and Clearance on Shearing Force and Estimation of Shearing Force Using Fuzzy Logic

2016

View full text Add to dashboard Cite

SummaryA significant challenge faced when using blanking/piercing to machine sheet metal is the handling of the shearing force required for high strength and thick stock. Increased shearing forces lead to the requirement of higher performance expected from the pressing machine and result in increased wear on the punch tool and die. Clearance, employed to increase precision and quality in blanking/piercing operations, affects the shearing force as well. One of the techniques used to reduce the force required is the employment of a punch shear angle. In this study, the effects of punch shear angle and clearance on the forces required for blanking/piercing were examined on a grade of steel broadly used in the manufacturing industry, DC01. Experiments were carried out using five different punch shear angles, namely 0°, 2°, 4°, 8°, and 16°. Six matrices with varying clearance rates (0.4%t, 0.5%t, 0.6%t, 0.7%t, 0.8%t, and 0.9%t) were used in this study, and these clearances were altered by modular matrices on the die. This study shows that shearing forces can be reduced by 80 % when 16° punch angle is used. The results of the experiments were transferred to a fuzzy logic model to obtain extrapolated results for intermediate values which had not been obtained from the experiments. The results obtained from the experiments and the output from the fuzzy logic model were compared and found to be highly similar. These results have showed that the model developed using fuzzy logic can be used to determine different shear angles and clearance values.

show abstract

Section: H Gürün M Göktaş a Güldaş Experimental Examination Of Ementioning

confidence: 99%

Experimental Examination of Effects of Punch Angle and Clearance on Shearing Force and Estimation of Shearing Force Using Fuzzy Logic

2016

View full text Add to dashboard Cite

show abstract

“…A very detailed experimental analysis of sheared edge stretchability was conducted for 6111-T4 aluminum alloy by Le et al (2013). Multiple cutting clearances varying from 5% to 40%, three in-plane orientations: (longitudinal (LD), transverse (TD) and diagonal (DD)), several prestrain levels, and cutting angles were tested.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In order to vary trimming conditions in one tool, one side of the sample was made straight while the other side had a half dog-bone shape. This sample design and the procedure of sample fabrication using a dedicated blanking die was previously discussed in details by Le et al (2013).…”

Section: Experimental Procedures For Trimming and Sheared Edge Stretchmentioning

confidence: 99%

“…Measurement of sheared edge stretchability of aluminum alloy was conducted based on methodology described in the paper by Le et al (2013). For each sample, the measurement was dependent on the location of the fracture, both cases are shown in Fig.2.…”

Section: Experimental Procedures For Trimming and Sheared Edge Stretchmentioning

confidence: 99%

“…The range of clearances between the shearing edges in the study was established between 5% and 40% of material thickness, as it was done in the previous study for conventional trimming by Le et al (2013). The samples were sheared in three directions relative to rolling direction: parallel to the longitudinal (LD), transverse (TD) and diagonal (45 o ) (DD).…”

Section: Figure 15 the Schematic Of Trimming Process With Scarp Supportmentioning

confidence: 99%

See 2 more Smart Citations

Mechanism of fracture of aluminum blanks subjected to stretching along the sheared edge

Wang

Golovashchenko

2016

Journal of Materials Processing Technology

Self Cite

View full text Add to dashboard Cite

The objective of this study was to investigate the mechanisms of fracture of aluminum blanks subjected to shearing and stretching along the sheared edge. In this study, a new imaging technique was implemented to track the stretching of the sheared edge until fracture. A 1 mm square grid was etched onto the sheared samples and a video of the sheared surface was taken incrementally during tensile test of the sample. The influence of cutting clearance in the trimming operation on sheared edge stretchability and mechanism of fracture of sheared surface during its stretching were investigated. Excessive plastic deformation of the burr area during the trimming operation was identified as a major factor leading to early fracture initiation from the tip of the burr. Deburring or solution heat treatment of samples trimmed with excessive clearance may increase stretchability to the level observed for the samples trimmed with accurate alignment of the tools. Roughening of the sheared surface produced with 5% cutting clearance did not have any significant effect on elongation of the sheared edge. Trimming process with scarp support eliminated burrs on the sheared edge for a large range of cutting clearances and substantially improved sheared edge stretchability.

show abstract

Study of deformation and fracture of high strength steel sheet during conventional and robust trimming by conducting partial trimming tests

Cui

Green

Alpas

2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

High-strength steels are used in the automotive industry for weight reduction and improved vehicle crashworthiness. In this work, an instrumented trimming die equipped with D2 steel inserts with sharp edges was used to trim DP980 sheets with clearances of 10%, 20% and 30% of the sheet thickness.Trimming trials were conducted either without a support pad under the scrap piece (conventional trimming) or with it (robust trimming). The deformation and fracture mechanisms in the shear affected zone (SAZ) at the sheared edge of DP980 sheet specimens were investigated by performing partial trimming tests and using a new metallographic preparation method as well as 3D surface pro lometry. For 10% clearance under conventional trimming, the damage distribution within the SAZ was practically symmetrical and the shearing mechanism consisted of cracks propagating simultaneously from the upper and lower surfaces of the sheet toward each other. However, the damage distribution became asymmetrical and the shearing mechanisms changed when the clearance was increased to 30%: the crack was initiated from the upper surface and propagated toward the lower surface resulting in the formation of a tensile-type burr. At 30% clearance, the robust trimming process (with a support pad) prevented the bending of the scrap piece resulting in a symmetrical damage distribution within the SAZ. In this case, a crack was initiated from the bottom surface of the sheet near the lower trim edge, and subsequently, another crack initiated from the upper surface, result in a decrease in upper die penetrations at the onset of fracture and at the end of trimming progress compare with conventional trimming. By using sharp die edge under robust trimming process, an improved sheared edge quality is achieved at larger clearances and this will help to reduce the production costs associated with dulling the die edge and the alignment of trim dies when the clearance is tight.

show abstract

Analysis of sheared edge formability of aluminum

Cited by 33 publications

References 10 publications

Experimental Examination of Effects of Punch Angle and Clearance on Shearing Force and Estimation of Shearing Force Using Fuzzy Logic

Experimental Examination of Effects of Punch Angle and Clearance on Shearing Force and Estimation of Shearing Force Using Fuzzy Logic

Mechanism of fracture of aluminum blanks subjected to stretching along the sheared edge

Study of deformation and fracture of high strength steel sheet during conventional and robust trimming by conducting partial trimming tests

Contact Info

Product

Resources

About