Die wear in stamping of advanced high strength steels – Investigations on the effects of substrate material and hard-coatings

Cora, Ömer Necati; Ağcayazı, Ali; Namiki, Kunio; Sofuoğlu, Hasan; Koç, Muammer

doi:10.1016/j.triboint.2012.02.016

Cited by 63 publications

(15 citation statements)

References 14 publications

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“…The calculated values of friction coefficients from the measured values of both drawing and blank holding forces according to equations (7) and (8) are given in Tab. 3.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of selected properties of coatings in respect of risk elimination of surface damage of stamped parts

Tkáčová

Zdravecká

Evin

et al. 2019

Koroze a Ochrana Materialu

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For achieving a long service life of stamping dies for new types of steel sheets intended for the automotive industry, the tribosystem must be optimally designed. One of the possible solutions is its optimization by coatings. More modern coating technologies for stamping dies include PVD (physical vapor deposition) and CVD (chemical vapor deposition) methods. The properties of PVD TiCN and DLC (diamond-like carbon) coatings deposited on ledeburitic high-alloy Cr–Mo–V steel were analyzed by standard tests (coating adhesion by both the scratch and Rockwell C tests, microhardness by Vickers method and coating thickness by Calotest) and developed tribo-meter of the “friction jaw-roller” type at drawing double-sided hot-dip galvanized steel sheet. The obtained results showed better tribological behavior of the DLC coating.

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“…The calculated values of friction coefficients from the measured values of both drawing and blank holding forces according to equations (7) and (8) are given in Tab. 3.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of selected properties of coatings in respect of risk elimination of surface damage of stamped parts

Tkáčová

Zdravecká

Evin

et al. 2019

Koroze a Ochrana Materialu

View full text Add to dashboard Cite

show abstract

“…Typical damages of the coating layers are cracking and powdering flaking. The exfoliated coating adheres to the surfaces of the steel and die, resulting in falling, wearing, and affecting the stamping formability of the steel sheet [8,9]. Therefore, it is of great practical significance to study the mechanical properties of the zinc coating and its influence on the deformation of galvanized AHSS during stamping forming.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Damage of Zinc Coating for Hot Dip Galvanized Steel Sheet DP600

Gui

Long

2020

Coatings

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Advanced high strength galvanized steel sheet has been one of the dominant materials of modern automotive panels because of its outstanding mechanical properties and corrosion resistance. The zinc coating thickness of hot dip galvanized steel sheet is only about 10–20 μm, which is a discarded object on the macro level. However, it is obvious to damage and impact on stamping performance. Therefore, this paper takes zinc coating as the research object and builds its mechanical constitutive model based on a nano-indentation test and dimensional analysis theory. We separated the zinc coating from the galvanized steel substrate and constructed a sandwich material model by introducing a cohesive layer to connect the zinc coating and the steel substrate. We obtained the interface binding energy between the zinc coating and the steel substrate through the nano-scratch test. The accuracy of the model is verified by the finite element analysis of hemispherical parts. We used the five-layers element model with 0 thickness cohesive layer to simulate the zinc coating damage of galvanized steel sheet. The hemispherical part drawing experiment is used to verify the feasibility of the finite element analysis results. The results demonstrate that it is more accurate to consider the finite element numerical simulation of the zinc coating, introducing the cohesive element to simulate damage between the coating and the substrate. Drawing depth, stamping force, and the strain of the numerical simulation are closer to the experimental results.

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“…On this subject, Gulzar et al [5] prepared a large-scale literature review that examined the tribological properties of nanoparticles added to lubricants. In this review, the effect of nanoparticles on lubricity was revealed by four different lubrication mechanisms such as a ball bearing effect [6][7][8], protective film formation [9][10][11], mending effect [12], and polishing effect [13].…”

Section: Introductionmentioning

confidence: 99%

“…In the literature, various tests have been used to determine the properties and effects of lubricants used in forming processes. Cora et al [6] conducted a sliding friction test to determine the friction characteristics of coatings on molds. Herrmann et al [7] determined the cooling and lubrication properties of vegetable oils using the grinding test.…”

Section: Introductionmentioning

confidence: 99%

The effect of nanoparticle-added solid lubricant on the formability of sheet metal

et al. 2019

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In sheet metal forming processes, formation without fracture is related to sheet metal formability. Parameters such as tool geometry, blank holder force, and lubricant are changed in order to push the formability of material to its maximum capacity. Lubricants play an important role in sheet metal forming processes. Depending on the type of lubricant, the formability of the sheet metal can be increased, the surface quality of the product can be improved, and the tool life can be extended. In this study, nanoparticles were added to solid lubricants, and the effect of nanolubricants on sheet metal formability was investigated with Erichsen test. Test specimens were observed by SEM, and the nanoparticle effect was investigated by EDX mapping. In addition, the optimum nanoparticle concentration was determined, and the effects of the nanoparticle on solid lubricants were compared with other lubricants which were used in sheet metal forming. As a result of the study, it was observed that the nanoparticle additive increased the formability by 13%. Results showed that the formability of the sheet metal increased up to certain nanoparticle concentrations, but it decreased above this limit.

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Die wear in stamping of advanced high strength steels – Investigations on the effects of substrate material and hard-coatings

Cited by 63 publications

References 14 publications

Evaluation of selected properties of coatings in respect of risk elimination of surface damage of stamped parts

Evaluation of selected properties of coatings in respect of risk elimination of surface damage of stamped parts

Mechanical Behavior and Damage of Zinc Coating for Hot Dip Galvanized Steel Sheet DP600

The effect of nanoparticle-added solid lubricant on the formability of sheet metal

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