Patent ID: 7832247

Claim:
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 ).