Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1991-10-07
1992-12-08
Larson, Lowell A.
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
72351, B21D 2414
Patent
active
051687380
ABSTRACT:
A hydroelastic deep-drawing device for use in presses for drawing a shaped sheet-metal workpiece and a control system for the device are disclosed. The device includes a ram which is movable through a first displacement point "a" and a sheet-holding plate is supported by the spacer pins and is movable downwardly with the ram through a second displacement point"b", a starting point "s" for pre-operating displacement, and a synchronous point "c". The control system includes a control device for generating a starting signal for a working cycle when the ram reaches the first displacement position "a", for accelerating the sheet-holding plate after the sheet-holding plate reaches the second displacement position "b", and for constantly comparing the velocity of the sheet-holding plate to that of the ram and for regulating the velocity of the sheet-holding plate so that, when the third displacement point "c" is reached, the velocity of the sheet-holding plate equals the velocity of the ram. A displacement-sensor system is provided which transmits a signal when an underside of the sheet-holding plate reaches the starting point "s" of the pre-operating displacement. A device is also provided for relieving the pressure in at least some of the working cylinders of the press when the displacement-sensor system transmits the signal.
REFERENCES:
patent: 4499750 (1985-02-01), Gerber et al.
patent: 4635466 (1987-01-01), Seki et al.
patent: 4745792 (1988-05-01), Story et al.
patent: 4896594 (1990-01-01), Baur et al.
Larson Lowell A.
Maschinenfabrik J. Dieffenbacher GmbH & Co.
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