METHOD OF MAKING BEET CUTTING KNIVES Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely, manufacture of sugar beet cutting knives at producing sugar. SUBSTANCE: method comprises steps of sheet blanking, heating blank and placing it in die set which includes two tools with triangle dents arranged in parallel on their working surface and having one tapered end. Dents of one tool are shifted relative to dents of another tool by value equal to pitch half of cutting faces of knife. Blank is formed at one stroke of press during two stages. At first stage blank is clamped by cantilever fashion in zone of knife holder. At second stage blank is shaped for providing its stepped lengthwise profile corresponding to final dimensions of knife. Simultaneously, zigzag cross relief with uniform allowances for milling cutting faces is made in zone of knife cutting portion. EFFECT: enhanced efficiency. 4 dwg