Method of producing improved serrated flats used in the manufacturing of grating

A rolling stand for producing serrated flats from hot billets of workable metal which have been formed into hot flats, comprising:

• an edging pass comprised of a pair of spaced apart edging rolls having aligned, facing grooves, one of said grooves having trapezoidal holes therein;
• said edging rolls being spaced so that the sum of the dimensions of the depths of the grooves and the parting distance of the rolls plus the depth of the holes is at least a specified amount less than the known, predetermined width of the hot flat entering said edging pass;
• the width of the grooves being at least as great as the known, predetermined thickness of the hot flat entering said edging pass;
• whereby to insure that hot metal flows into said trapezoidal holes to impart serrations to said hot flat.

A method of producing improved serrated flats having a predetermined width and thickness comprising:

• continuously passing a hot billet of a workable metal through a series of rolling stands to obtain a hot flat;
• providing an edging pass comprised of a pair of spaced apart edging rolls having aligned facing grooves, one of said grooves having trapezoidal holes therein;
• the width of said grooves being at least as great as the thickness of the hot flat;
• the spacing of said edging rolls being such as to sufficiently reduce in width said hot flat to impart serrations of a desired height thereto by forcing hot metal to flow into said trapezoidal holes.