Fine-Piercing of Electrical Steel Sheets by Edge-Sharpened Diamond Punch

Aizawa, Tatsuhiko; Shiratori, Tomomi

doi:10.1007/978-3-030-75381-8_233

Cited by 1 publication

(2 citation statements)

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“…Due to the axisymmetric mechanical condition, the spin rotations and the plastic strains related to the direction of depth were neglected; the radial and circumferential plastic strains (εr and εθ) and the radial rotation (ω) were only effective to describe the material response in Figure 1. As suggested in [15], when piercing under the narrow clearance, the severely distorted zone was limited to a vicinity of the pierced hole for r < r 1 . Since the initial crystallographic orientation of single crystal was different from the shearing direction, each zone in the single crystal was forced to significantly rotate itself together with plastic straining.…”

Section: Characterization Of the Straining And Spinning In The Single...mentioning

confidence: 74%

“…As shown in Figure 2b, the nitrided SKD11 punch with the diameter of 2.00 mm and core die were edge-sharpened by using the argon ion beam irradiation [16,17] to discuss the possibility to control the plastic straining and spin-rotation process in piercing. As suggested in [15], when piercing under the narrow clearance, the severely distorted zone was limited to a vicinity of the pierced hole for r < r1. Since the initial crystallographic orientation of single crystal was different from the shearing direction, each zone in the single crystal was forced to significantly rotate itself together with plastic straining.…”

Section: Preparation Of the Nitrided Punch And Core-diementioning

confidence: 74%

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Quantitative Characterization of the Affected Zones in a Single Crystal Fe-6Si Steel Sheet by Fine Piercing

Aizawa¹,

Shiratori

Yoshino

et al. 2022

Micromachines

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An iron loss in the motor core was often enhanced by formation of plastically affected zones in piercing the electrical steel sheets. A platform methodology to carry out quantitative evaluation of these affected zones in the pierced electrical steel sheets was proposed to search for the way to minimize the affected zone widths. A coarse-grained electrical steel sheet was employed as a work material for a fine piercing experiment under the narrowed clearance between the plasma-nitrided SKD11 punch and core-die. The shearing behavior by the applied loading for piercing was described by in situ measurement of the load-stroke relationship. The plastic straining in the single-crystal electrical steel sheet was characterized by SEM (scanning electron microscopy) and EBSD (electron back-scattering diffraction) to define the affected zone size and to analyze the rotation of crystallographic orientations by the induced plastic distortion during piercing. Integral and differentiation of spin rotation measured the affected zones. The effect of punch edge sharpness on these spin-rotation measures was also discussed using the nitrided and ion-milled SKD11 punch and core-die.

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Section: Characterization Of the Straining And Spinning In The Single...mentioning

confidence: 74%

Section: Preparation Of the Nitrided Punch And Core-diementioning

confidence: 74%