Apparatus and Method for Manufacturing Sprocket Segment

An apparatus for manufacturing a sprocket segment, which is installed on a press to manufacture the sprocket segment (1) by means of a hot forging process, comprising:

• a bending type booster die (10) having an upper die (14) and a lower die (15) for primarily hot-forging a heated billet in a booster type to distribute its volume;
• a blocker die (11) having an upper die (16) and a lower die (17) for secondarily hot-forging the material (M) hot-forged in the booster die (10) to form a rib face (4);
• a finisher die (12) having an upper die (18) and a lower die (19) for tertiarily hot-forging the material (M) primarily and secondarily hot-forged in the blocker die (11) to keep right angles and planes of a toothed face (6) and the rib face (4);
• knock-out pins (21) mounted on the upper dies (16;
• 18) and the lower dies (17;
• 19) of the blocker die (11) and the finisher die (12) and elastically mounted on springs (20) for extracting a product;
• a trimming-piercing-coining die (13) for simultaneously trimming, piercing and coining the material (M) hot-forged three times;
• a product guide die (22) fixed on the upper portion of a lower trimming holder (28) of the trimming-piercing-coining die (13), on which the material (M) is seated;
• a flash cutting die (23) mounted on an upper trimming holder (30) located above the product guide die (22);
• a piercing punch (25) vertically mounted on a cushion stripper (24);
• and
• a flash eliminating die (27) mounted in both side directions of the product guide die (22) for eliminating a flash cut by an operation of an air cylinder (26).