| 摘要 |
PURPOSE: To prevent deterioration of surface roughness of a material to be worked by making the coefficient of friction in the direction vertical to the advancing direction of the material smaller than the coefficient of friction in the advancing direction of the material in the surfaces where press plates and/or edging dies are brought into contact with the material to be worked. CONSTITUTION: A metallic plate S is fed into a edging device. The metallic plate S is pressed with the press plate 13, the edging dies 1 are driven and the metallic plate S is edged. When the coefficient of friction of the surface of the press plate 13 in the direction (C direction) vertical to the advancing direction of the material is expressed byμC, the coefficient of friction of the surface of the press plate 13 in the advancing direction (L direction) of the material byμL, the coefficient of friction of the surface of the edging die 1 in the C direction byνC and the coefficient of friction of the surface of the edging die 1 in the L direction byνLo , they are taken asμC<μL, orνC<νL, orμC<μL andνC<νL. The deformation in the width direction on the pressing surface is easy and the roughness in the upper surface and lower surface of the metallic plate S is not deteriorated. Since the coefficient of friction in the L direction is larger than that in the C direction, the bite of the material S is good.
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