Investigation of Failure Mechanisms of Cemented Carbide Fine Blanking Punches by Means of Process Forces and Acoustic Emission

Voigts, Herman; Hild, Rafael; Feuerhack, Andreas; Bergs, Thomas

doi:10.1007/978-3-030-75381-8_98

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…appropriate tool materials regarding a sufficiently high tool life [13]. Compared to the reference state, the relative height reduction of the second pre-hardening stage (Δℎ = 6.1%) led to a steeper rise of the blanking force progression as well as to a 6.9% increase of the maximum blanking force.…”

Section: Fine Blanked Part Characteristics (A)mentioning

confidence: 96%

“…This process-immanent hardening in the near-surface area of fine blanked functional surfaces offers the potential to substitute a downstream heat treatment by using sheet materials with high strengths and strain hardening properties [8]. Regarding the use of lightweight materials, High Strength Steels (HSS) such as micro-alloyed fine grain steel S700MC (1.8974) are increasingly used for fine blanking [13]. However, as increasing strength is accompanied by a lower forming capacity [14], HSS are only suitable to a limited extent for forming sheet metal workpieces with spatially complex geometry.…”

Section: Introductionmentioning

confidence: 99%

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Fine blanking of pre-hardened high manganese steel to investigate the sheared surface hardening and part quality

SCHWEINSHAUPT

2023

Materials Research Proceedings

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Abstract. Fine blanking is a highly productive process for manufacturing of high accuracy sheet metal parts with functional surfaces. The specific process characteristic leads to high forming in the shear zone and an associated strain hardening of the sheared functional surfaces. Utilization of the process-immanent sheared surface hardening can reduce time and resources of downstream heat treatment processes such as case hardening. High Manganese Steels (HMnS) are characterized by a high strain hardening capacity due to the deformation mechanisms of twinning and transformation induced plasticity occurring during forming. As a result of high tensile strengths, HMnS are suitable as lightweight materials, but often exhibit a relatively low yield strength in terms of structural design features. One approach for increasing the strength values without changing the alloy design is a forming-induced strain hardening of the semi-finished sheet metal by means of upsetting. Therefore, this paper deals with an experimental investigation of the influence of pre-hardening on the blanked part properties during fine blanking of HMnS X40MnCrAlV19-2 LY (1.7401). For this purpose, sheet blanks were strain hardened by means of flat coining and subsequently fine blanked with an analog geometry representing tribologically stressed functional surfaces. Relevant functional surfaces were then analyzed by means of microhardness measurements with regard to the sheared surface hardening as well as characterized in terms of the quality-determining attributes die roll and clean-shear area. Due to the deformation mechanism of twinning, fine blanking of pre-hardened HMnS resulted in a combination of process-immanent high sheared surface hardening and increased yield strength with simultaneous optimal functional surface quality.

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Section: Fine Blanked Part Characteristics (A)mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Fine blanking of pre-hardened high manganese steel to investigate the sheared surface hardening and part quality

SCHWEINSHAUPT

2023

Materials Research Proceedings

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“…Both developments result in higher tool loads and thus shorter tool life time [2,3]. Therefore, it is part of current research to investigate the properties and applicability of new tool materials such as cemented carbides [4,5]. Cemented carbides can resist high compressive stresses and are significantly harder than conventional tool materials.…”

Section: Introductionmentioning

confidence: 99%

Coefficient of friction of cemented carbides machined by sinking EDM

Petersen

2023

Materials Research Proceedings

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Abstract. Cemented carbides possess properties that predestine them as a durable tool. However, these properties hinder conventional machining, which is why Electrical Discharge Machining (EDM) is a promising alternative. Three different EDMed cemented carbides were compared with a ground surface in a pin-on-disk test setup. They were evaluated under dry and lubricated conditions with two distinct antibody materials. The tests did not reveal a correlation between the surface roughness of the cemented carbide pins and the coefficient of friction. However, some test sets yielded very different results, which is why particular considerations should be made with new sliding compositions.

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Investigation of Failure Mechanisms of Cemented Carbide Fine Blanking Punches by Means of Process Forces and Acoustic Emission

Cited by 2 publications

References 9 publications

Fine blanking of pre-hardened high manganese steel to investigate the sheared surface hardening and part quality

Fine blanking of pre-hardened high manganese steel to investigate the sheared surface hardening and part quality

Coefficient of friction of cemented carbides machined by sinking EDM

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