Method for forming a diaphragm and diaphragm

Details Method for forming a diaphragm and diaphragm Method for forming a diaphragm and diaphragm

1991-07-31

1992-08-04

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148400, 148437, 148564, 164285, 181168, 420401, 420552, 420902, 72483, C22C 2100, G10K 1300

Patent

active

051355825

ABSTRACT:
The present invention is directed to a method for producing a diaphragm for highly brittle metals used in loudspeakers, comprising a step of making a laminated plate by stacking a plate of superplastic material on a plate of highly brittle metal. The laminated plate is arranged on a mould, and the laminated plate is heated to a predetermined range of temperatures, determined according to the highly brittle metal. Subsequently, the laminated plate is deformed by pressuring the laminated plate in the mould, at the range of temperatures. Thus, a diaphragm can be formed from a plate of highly brittle metals, without causing brittle fracture or generating internal or surface defects.

REFERENCES:
patent: 4518443 (1985-05-01), Yokozeki et al.

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