Method for improving the release and finish characteristics of m

Details Method for improving the release and finish characteristics of m Method for improving the release and finish characteristics of m

1983-07-27

1986-04-15

Crane, Daniel C.

Metal deforming

By shot-blasting

29 90A, 51320, C21D 706

Patent

active

045819130

ABSTRACT:
A method for improving the release and finish characteristics of metal stamping dies includes shot peening the interior die cavity walls with substantially spherical shot having a hardness value at least equal to the hardness value of the die cavity walls. Optimizing the parameters of the peening process, such as the Almen intensity and the shot type, size, hardness and uniformity, maximizes the improvement to the release and finish characteristics of the die. Optionally, the initial shot peening is followed by a second shot peening with substantially spherical glass beads. Metal stamping dies shot peened in accordance with the present method exhibit substantial improvement in their release and finish characteristics over unpeened dies.

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Woelfel and Mulhal, "Glass Bead Impact Blasting", Sep. 1982, vol. 122, No. 4, pp. 57-59.
"Automatic Shot-Blasting of Hot Ingot Moulds", Process Control and Automation, vol. 10, Dec., 1963.

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