| 摘要 |
PURPOSE:To make a very thick steel plate shearable by machining a groove on both upper and lower surfaces of a work material along a shear line connecting an upper tool edge and a lower tool edge in parallel with the cutter longitudinal direction and then shearing the work material in making both upper and lower tools accord with the groove position. CONSTITUTION:V-type kerfs 4 and 4 are grooves on both upper and lower surface of a work material along a shear line A of a thick steel plate 1. Here, depth (h) of these kerfs 4 and 4 is found by an empirical formula, and it is desirable that the position is set to about 10-15% of plate thickness. And, if the V-type kerf depth (h) and a kinife gap G are the same and it is compared with such one that forms vertically perpendicular kerfs 6 and 6 in an intermediate part of this knife gap G, it is known that such as case as machined along the shear line connecting these kerfs 4 and 4 and each edge of both upper and lower tools 2 and 3 is more effective in a fact that plate thickness becomes larger. With this constitution, since a very thick steel plate is made shearable without changing ability of the existing shear, improvements in labor saving and productivity are contrived.
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