Straightening machine for straightening sheet metal and flat mat

Details Straightening machine for straightening sheet metal and flat mat Straightening machine for straightening sheet metal and flat mat

1977-12-20

1979-05-08

Mehr, Milton S.

Metal deforming

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

Sensing tool or tool-linked part

72165, B21D 102

Patent

active

041529138

ABSTRACT:
A material straightening machine is provided with upper and lower roller frames and at least two piston assemblies interconnecting the frames and located respectively at the inlet and outlet sides of the roller frames. Each piston assembly includes a chamber housing a piston, the chamber being further divided by the piston into an upper annular chamber and a lower annular chamber. The upper annular chamber is connected directly to a pressure medium source while the lower annular chamber, which has a cross sectional area which differs from that of the upper annular chamber, is connected to the pressure medium source through a servo-controlled pressure reducing valve. Relative movement between the frames is effected by controlling the pressure reducing valve.

REFERENCES:
patent: 2944585 (1960-07-01), Ungerer
patent: 3031009 (1962-04-01), Muddiman

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