Method of determining stroke length of a pneumatic forging hamme

Details Method of determining stroke length of a pneumatic forging hamme Method of determining stroke length of a pneumatic forging hamme

1987-01-05

1987-12-15

Spruill, Robert L.

Metal deforming

With use of control means energized in response to activator...

Metal deforming by use of roller or roller-like tool element

72 16, 72 20, 72 26, 72 9, 364476, 91247, 173 8, B21J 916

Patent

active

047124156

ABSTRACT:
A forging hammer employs compressible fluid to drive the ram into impact and a trapped volume of compressible fluid to cause the ram to be retracted from impact position when fluid driving the ram into impact is released. The velocity of impact is adjusted by the timing of the opening of a valve allowing variable amounts of compressible fluid into a cylinder from a compressible fluid supply. Historical data is accumulated on a given forging hammer correlating the peak lifting fluid pressure with ram stroke. Thereafter, it is possible by measuring lifting fluid pressure and obtaining the peak value to determine the stroke by comparing the measured value against compiled pressure vs. stroke data for various residual lifting air pressures. Knowing the dimensions of dies and other structures employed with a forging hammer, it is then possible to calculate the rate of deformation from the forging size of the previous blow and the forging size of the current blow. If the forging size is less than a predetermined minimum amount, whereby it can be finished in a single blow, it is then possible to adjust the force of that blow by adjusting the valve to provide the impact energy needed to finish the forging. Thereafter it is possible when the maximum permissible deformation has been reached to sense that effect and terminate the forging action until the forging is removed and a new forging provided.

REFERENCES:
patent: 3142206 (1964-07-01), Hague et al.
patent: 3464315 (1969-09-01), Weyer
patent: 3818799 (1974-06-01), Hague
patent: 3916499 (1975-11-01), Frame et al.
patent: 3930248 (1975-12-01), Keller
patent: 4116122 (1978-09-01), Linder et al.
patent: 4131164 (1978-12-01), Hague et al.

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