PURPOSE: To prevent the deformation of a chamber and to smooth the discharging of a chip by holding the chamber by fitting it to a combustion chamber and using the core metal provided with the discharging hole of a chip.
CONSTITUTION: A chamber main body 1 is fitted with engagement to a slant hole 13 of a tie die 11 whose shape is shown in figure by engaging a combustion chamber with the tip of a core metal 15. According to the descent of a press crank, a press plate 22 is descended, a stripper plate 23 is descended by interlocking therewith, the upper face 4 of the chamber main body 1 is pressed by a work presser 25 and after a flange is fixed to an inclined face 12, the prepd. hole of a nozzle hole is punched by a punch 10. After punching, the slider 20 for knockout is advanced to lift a knockout pin 18 and the chamber main body 1 is pushed out of the slant hole 13. Since the inner and outer peripheral faces are punched by being held by fixing it to the tie die 11 firmly, the deformation against punching impact is prevented. A chip is discharged smoothly from the chip discharging holes 16 and 14 of the die 11 and core metal and the chamber main body 1 is not damaged.
USUDA KENTARO
HASUNUMA MITSUO
KOIKE SHINICHI
USUDA KENTARO