Analysis of Cutting Surface During Cutting of Electric Sheets

The quality of the sheared surface when blanking, also known as die-cutting, is the result of several factors. Based on current knowledge about blanking, the following technological parameters – shear gap size, blunting of the shearing tool, lubrication in the shearing process, and deformation rate – can be considered as decisive parameters on the quality of the sheared surface. The main material characteristics include yield strength, tensile strength, ductility, and ferrite grain size. The paper is focused on the influence of the shear gap on the quality of the shear surface of electrical sheets with different chemical composition and different mechanical properties. The quality of the cutting surface was characterized by the size of the plastic cutting area. The relationships between the size of the shear gap, which ranged from 1 to 7% of the thickness of the cut material and the size of the plastic shear area, were evaluated and measured macroscopically.

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“…Fig. 7-9 show the sheared surfaces of the investigated materials at different shear gaps [19], [20].…”

Section: Materials Used In the Experimental Studymentioning

confidence: 99%

The Impact of Shear Gap Size on the Quality of the Sheared Surface in Electrical Steel Sheet Blanking

Spišák

Majerníková²,

Kaščák³

et al. 2020

Acta Metall Slovaca

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Experimental and finite element analysis of the shear cutting process of electrical steel sheets under various process conditions

Slota

Spišák

Kaščák

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Almost every electrical machine consists of the stator and rotor cores, which are made of stacked non-oriented electric steel sheets. Punching and blanking are the two commonly used shear cutting operations for manufacturing electrical machine components. The presented research was aimed to evaluate the shear cutting process of two grades of electrical steel sheets. The shear cutting process causes the formation of residual stresses in the cut segments from the non-oriented electric sheet metal, resulting in increased iron losses. Numerical modeling and experimental research were used to investigate the influence of cutting clearance as well as blunt cutting edge of the shear cutting tool on the residual stresses induced by shear cutting under different shear cutting parameters. The data derived from experiments were applied in finite element analysis of the shear cutting part in the shape of a toroid. Comparison between the results of the experiments and the FE simulations showed that the shear cutting process can be accurately predicted.

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FEM Modeling of Shear Cutting of Electrical Steel Sheets under Various Technological Conditions

Slota¹,

Kaščák²,

Kut³

2019

Acta Mechanica Slov.

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Almost all electrical machine consists of the stator and rotor cores, which are made of stacked non-oriented electric steel sheets. Punching and blanking are the two commonly used shear cutting technologies. The efficiency and performance of an electrical machine depend on the magnetic properties of its magnetic core. The shear cutting process causes the formation of residual stresses in cut segments next to the cutting line from the nonoriented electrical sheet metal, resulting in increased iron losses. The extent of deterioration in the magnetic material properties depends on the amount of induced stresses, which is affected by the used process parameters during shear cutting and the mechanical properties of the electrical steel sheets. This paper focuses on the residual stresses induced by punching with different shear cutting conditions using finite element analysis. Influence of cutting clearance of the shear cutting tool on were observed.

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Analysis of Cutting Surface During Cutting of Electric Sheets

Cited by 3 publications

References 8 publications

The Impact of Shear Gap Size on the Quality of the Sheared Surface in Electrical Steel Sheet Blanking

The Impact of Shear Gap Size on the Quality of the Sheared Surface in Electrical Steel Sheet Blanking

Experimental and finite element analysis of the shear cutting process of electrical steel sheets under various process conditions

FEM Modeling of Shear Cutting of Electrical Steel Sheets under Various Technological Conditions

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