Die unit for punching operations

(19)

(11)

EP 0 734 799 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	16.04.1997 Bulletin 1997/16

(43)	Date of publication A2:
	02.10.1996 Bulletin 1996/40

(21)	Application number: 96400662.1

(22)	Date of filing: 28.03.1996

(51)	International Patent Classification (IPC)⁶: B21D 28/24

(84)	Designated Contracting States:
	DE FR GB IT

(30)

Priority:

28.03.1995 JP 69470/95

(71)	Applicant: AMADA METRECS COMPANY, LIMITED
	Kanagawa 259-11 (JP)

(72)	Inventor:
	Iwamoto, Masami Minamiashigara-shi, Kanagawa 250-01 (JP)

(74)	Representative: Hasenrader, Hubert et al
	Cabinet Beau de Loménie 158, rue de l'Université 75340 Paris Cédex 07 75340 Paris Cédex 07 (FR)

(54)	Die unit for punching operations

(57) A die unit for performing punching operations in cooperation with a punch unit is disclosed. The die unit includes a die body (3) formed with a die hole (5) extending in an axial direction for receiving a cutting edge of the punch body (17) , and with an upper surface portion (7) extending in a plane normal to the axial direction. The die unit also includes a projecting portion (11) formed along the perimeter of the die hole (5) on the upper surface portion (7) of said die body (3). With this die unit, punching operations can be performed on a workpiece without producing s burr that projects downwardly below the lower surface of the workpiece. Thus burr removing operations are dispensed with after the punching operations.

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