Swaging apparatus with timed pre-fill

Details Swaging apparatus with timed pre-fill Swaging apparatus with timed pre-fill

1983-05-16

1984-09-11

Gilden, Leon

Metal deforming

By application of fluent medium, or energy field

Using fixed die

7245301, 7245302, 29727, 91400, 91410, 91433, 60540, 60541, 60593, B21D 7210

Patent

active

044702809

ABSTRACT:
In an apparatus for forming leak-proof joints between tubes and a tube sheet by the internal application of hydraulic swaging pressure, the flow of relatively low pressure fluid from a pressure source to an intensifier is permitted or interrupted by a control valve. During a prefill period, a prefill valve causes the low pressure fluid to bypass the low pressure input side of the intensifier and flow directly to the high pressure side and then to a mandrel. Thereafter, the low pressure fluid is caused to enter the low pressure side of the intensifier to increase the pressure in the mandrel during a swaging period. A pressurization sensor, which is connected to the input and output sides of the prefill valve, contains a piston which is movable in response to the difference in the pressures at these two points to produce a termination signal which, after a delay, actuates the control signal at the end of the swaging period.

REFERENCES:
patent: 3585701 (1971-06-01), Stary
patent: 4055063 (1977-10-01), Krips
patent: 4362037 (1982-12-01), Whitfield
patent: 4407150 (1983-10-01), Kelly

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