Method for making a die for stamping metal reflectors

Details Method for making a die for stamping metal reflectors Method for making a die for stamping metal reflectors

1980-09-15

1984-01-10

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Die

72702, B21K 520, B21D 3710

Patent

active

044247273

ABSTRACT:
A method for making a metal stamping die suitable for use in forming sheet metal reflectors for photographic use. The structure of the metal stamping die is made in the manner of the method to compensate for spring-back characteristics of a material used to form a reflector by first constructing a test die which has a predetermined shape related to the desired reflector shape. A comparison is then made between a test workpiece made with the test die and the desired reflector shape to determine the die shape that produces a corresponding portion of the reflector shape. Finally, another die is constructed by shaping it in accordance with the comparison to obtain a final die shape that will acceptably produce the desired reflector shape.

REFERENCES:
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patent: 1471767 (1923-10-01), Wood
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patent: 3609332 (1971-09-01), Schindler
patent: 3722257 (1973-03-01), Bogart et al.
patent: 4116038 (1978-09-01), Berthou
"Seven Ways to Control Springback", Machinery, vol. 73, No. 11, Jul. 1967, pp. 78 and 79.
"The Forming of Sheet Metal", Hecker et al., Scientific American, Nov. 1976, pp. 100-108.

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