| 摘要 |
<P>PROBLEM TO BE SOLVED: To efficiently carry out shearing of a metal material such as a thick steel plate by a small shear load by using a rolling cut shear. <P>SOLUTION: When shearing the metal material in its longitudinal direction by plurally repeating shearing of the metal material by using upper and lower blades, a material position in a material feeding direction at shearing is controlled such that a vertical maximum shear load Pmax becomes a vertical target shear load Pa or less on the basis of a vertical shear load distribution P<SB POS="POST">JI</SB>(x) in a material shear direction x measured at shearing of a first time of the metal material or a vertical shear load distribution Psu(x) calculated by an equation P(x)=Kt<SP POS="POST">2</SP>/tanθ(x) (wherein t: a plate thickness of the metal material, K: shear resistance of the metal material, θ(x): a relative rake angle distribution in the material shear direction x). <P>COPYRIGHT: (C)2012,JPO&INPIT |
