MANUFACTURE OF EXPANDED METAL GRATING

PURPOSE:To produce continuously and automatically the titled product tough against oblique load without any limit in the quality at low cost without welding by cutting in the prescribed pitch and length the bent part of the both faces of the joined stock of plurally bent faces and by spreading in the width direction in hexagonal mesh shape with the tight contact of non-cut part. CONSTITUTION:The corrugated stock A1 that a metallic plane sheet A is subjected to a bend work 1 in corrugating shape is made in a prism shape or thick plate shape A2 with compressing 2 like the adjoining bent faces coming in close contact with each other. The bent edge parts (b), (c) of both sides of this prism stock A2 is cut off 3 in the prescribed widths d1, e1 leaving the prescribed pitch widths d2, e2. The bent edge part is spreaded in the width direction by the biting of the spiral screw roll 4 whose pitch is gradually widened and made in hexagonal mesh shape with expanding by the double part (f) of cutting both sides. There is no limitation in the quality due to no conventional welding being performed and the low cost by simple process work and continuous automated manufacture are enabled.