Buckling of the cutting punch Normal conditions

Bend cutting punch — Fig. 1
Bend punching die
① Spring-loaded guide plate ② Fixed guide plate l₂ Free buckling length according to Euler case 2 l₃ Free buckling length according to Euler case 3 s₀ Sheet thickness

To calculate the buckling of cutting punches, Euler cases 2 and 3 are used. The length dimensions can be derived from the construction. It is assumed that the maximum moment of force is reached when the punching die has penetrated one third into the sheet metal.

The validity range for normal conditions includes a safety factor of 3. For unfavorable conditions, however, a safety factor of 5 is used. This takes into account additional uncertainties and potential risks to ensure that the punch functions reliably under these conditions.53

Eqn. 1

maximum Compression Stress

σ_{d zul}

1,628

MPa

Young's modulus	E	=	210	GPa
Slenderness ratio	λ	=	16

210

Calc 1

Allowable compressive stress for normal conditions 53

Klepzig, W. / Schneid- und Umformwerkzeuge für die Blechbearbeitung (Stanzwerkzeuge) / Hochschul-Lehrmaterial / Zwickau / 2010 / …