Table 5 Maximum drop of ultrasonic on forming force of thin sheetmetal punching.

From: Effect of ultrasonic vibration on forming force and forming quality in micro-punching with a flexible punch

Thin sheetmetal( μm)

Die diameter ( μm)

Ultrasonic time (s)

Ultrasonic power (%)

Decrease amplitude of forming force (%)

10

500

0.20

55

85.21

10

600

0.20

55

84.20

10

700

0.30

50

86.98

20

700

0.40

50

81.68

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