An incremental analysis of a deep drawing steel’s material behaviour undergoing the predeformation using drawbeads

Schmid, Harald; Suttner, Sebastian; Merklein, Marion

doi:10.1088/1742-6596/896/1/012010

Cited by 5 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results show that some geometries of the drawbead enabled nearly invariant dynamic behaviour, in that the restraining force was almost insensitive to changes in friction conditions. Schmid et al [ 31 ] modified a strip drawing test to observe the material behaviour of DC04 steel while passing a drawbead. An overall increase in hardness while passing the sheet through a drawbead was pointed out.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

et al. 2021

View full text Add to dashboard Cite

The article presents the results of friction tests of a 0.8 mm-thick DC04 deep-drawing quality steel sheet. A special friction simulator was used in the tests, reflecting friction conditions occurring while pulling a sheet strip through a drawbead in sheet metal forming. The variable parameters in the experimental tests were as follows: surface roughness of countersamples, lubrication conditions, sample orientation in relation to the sheet rolling direction as well as the sample width and height of the drawbead. Due to many factors that affect the value of the coefficient of friction coefficient, artificial neural networks (ANNs) were used to build and analyse the friction model. Four training algorithms were used to train the ANNs: back propagation, conjugate gradients, quasi-Newton and Levenberg–Marquardt. It was found that for all analysed friction conditions and sheet strip widths, increasing the drawbead height increases the COF value. The chlorine-based Heavy Draw 1150 compound provides a more effective friction reduction compared to a LAN-46 machine oil.

show abstract

Section: Introductionmentioning

confidence: 99%

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Also, it needs to be considered that the introduced strain is quite different for the used materials. This could be already shown in [6] by the authors, where different strain levels were investigated by the help of an optical measurement system ARGUS (GOM GmbH) for DC04 and DP800.…”

Section: Discussion Of Materials Behaviourmentioning

confidence: 61%

“…The sheet metal strips with a size of 700 Â 50 mm 2 need to pass the drawbead passage where they are preloaded. Therefore, a modified strip drawing test is used, that was also described in [6] and is shown in detail in Figure 1. The used drawbead geometry is built according to the Numisheet 2008 benchmark [21] and has a peak radius of r p = 6.5 mm, a drawbead height h of either h 1 = 3.6 mm or h 2 = 5.0 mm.…”

Section: Methodsmentioning

confidence: 99%

“…Also, results from a modified strip drawing test with a drawbead geometry are compared to results from a deep drawing process. In addition, in [6] the influence of drawbeads on material hardening was also investigated on the upper and lower side in drawing direction. Additionally, the measured strain development was correlated with the hardening behaviour and an overall hardening as well as a rising accumulated strain was described.…”

Section: Introductionmentioning

confidence: 99%

“…Werber et al [20] were able to show the effect of different linear pre-stretching methods on the forming limit diagram and therefore the failure behaviour. As the preloading in a drawbead is even more complex according to [6], a significant effect on the failure behaviour like fracture strains is also expected.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the mechanical properties of sheet metals drawn through drawbeads

Schmid

Merklein

2019

Manufacturing Rev.

View full text Add to dashboard Cite

The use of modern materials leads to a need for detailed knowledge of the material flow. Drawbeads are one common way to control serial forming processes. Although they are already well investigated, the effect on the resulting mechanical properties after a drawbead passage is not analysed in detail yet. This work is showing the influence of a drawbead geometry used in deep drawing on typical mechanical properties. Therefore, different sheet metal materials are preloaded in a modified strip drawing test with commonly used drawbeads. In testing, three different levels of pressure between 2.5 MPa and 7.5 MPa and of drawing speed between 10 mm/s and 50 mm/s are combined to nine variations and are examined. Afterwards, specimens are cut out by a laser cutting machine of the drawn strips. Those specimens are then tested with the use of an optical measurement system. Results are discussed in relation to blankholder pressure, drawing velocity and drawbead geometry to work out the main effects. Overall it can be stated, that variations of blank holder pressure and drawbead height lead to significant changes for the material properties. A variation of the drawing velocity in the observed range does not show significant effects.

show abstract

Analysis of Work Hardening and Tribological Changes After a Gap Controlled Drawbead Passage

Schmid

Merklein

2021

Forming the Future

View full text Add to dashboard Cite

An incremental analysis of a deep drawing steel’s material behaviour undergoing the predeformation using drawbeads

Cited by 5 publications

References 6 publications

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

Modelling of Friction Phenomena Existed in Drawbead in Sheet Metal Forming

Study of the mechanical properties of sheet metals drawn through drawbeads

Analysis of Work Hardening and Tribological Changes After a Gap Controlled Drawbead Passage

Contact Info

Product

Resources

About