Method for forming counter-sunk hole in a base material and...

Details Method for forming counter-sunk hole in a base material and... Method for forming counter-sunk hole in a base material and...

B - Operations, Transporting

23

D

77/39

B23D 77/12 (2006.01) B21D 22/04 (2006.01) B21D 28/24 (2006.01)

Patent

CA 1055279

ABSTRACT OF THE DISCLOSURE A method and apparatus for producing counter-sunk holes in a plate-like base material. Preliminary holes are punched through a plate-like base and a seat is courter-sunk around one end and coaxially with each preliminary hole by compressing base material surrounding the end of the preliminary hole to force portions of the material into the preliminary hole and out of another end of the preliminary hole while keeping the base plate-like and otherwise avoiding deformation of surfaces of the plate-like base. A finishing hole is then punched coaxially with the counter-sunk seat and preliminary hole to remove portions of base material forced into the preliminary hole.

266979

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