Cold working process

Details Cold working process Cold working process

1973-10-01

1977-03-15

Gilden, Leon

Metal working

Method of mechanical manufacture

Shaping by direct application of fluent pressure

29407, 29622, 113116R, B23P 1700

Patent

active

040116506

ABSTRACT:
A thin metal diaphragm of a differential pressure unit (DPU) is stretched beyond its yield point. This method step unexpectedly reduces the spring rate and zero shifts due to line pressure fluctuations and due to differential thermal expansion and contraction between the diaphragm and its support. It also unexpectedly makes the DPU more accurate by allowing for a weaker and more accurate zero spring adjustment.

REFERENCES:
patent: 3123903 (1964-03-01), Flanagan
patent: 3302269 (1967-02-01), Cooper et al.
Marks' Mechanical Engineer Handbook, Sixth Edition, McGraw-Hill Book Company, pp. 5 - 3.

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