METAL PLATE BURRING METHOD

WIPO Patent Application WO/2018/124254

A1

Provided is a highly flexible and simple burring method having a wide range of applications, regardless of the size of flat holes or the burring height around the edges of same during the process of burring metal plates. This method performs burring on a metal plate by: arranging one surface of the metal plate on the surface of a die having a vertical inner circumferential surface relative to a flat surface of the die and having a cavity having a flat cross-section inner circumference that is horizontal to the flat surface; and pressing a flat burring punch from the other surface of the metal plate towards the cavity, said burring punch having a vertical outer circumferential surface relative to the die flat surface. The punch has a flat cross-section parallel to the flat surface and, in a state in which the punch is pressed towards the cavity having the metal plate therebetween, the interval between a pair of vertical outer surfaces parallel to the pressing direction of the punch and inner surfaces of the die cavity facing same, at positions at both ends of the punch cross-section in the longitudinal direction, is set smaller than the gap between the outer surface of the punch parallel to the pressing direction and the inner surface of the die cavity facing same, at positions at both ends of the cross-section in the width direction.

JP2782002	[Title of the Invention] A method for forming a tubular portion having a bottom portion on a plate material.
JPH0788567	HEMMING DEVICE

TAKASE MASAAKI (JP)

PCT/JP2017/047146

July 05, 2018

December 20, 2017

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T RAD CO LTD (JP)

B21D19/08; F28F9/04

JPH08267147A	1996-10-15
JP2006214702A	2006-08-17
JPH02154992A	1990-06-14

KUBOTA Takubi (JP)

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