DEVICE FOR CONTROL OF SECTOR CLAMP OF DIE FOR SHEET STAMPING Russian patent published in 2020 - IPC B21D22/22 B21D24/10 B21D37/14 B30B15/00 

FIELD: metal forming.

SUBSTANCE: invention relates to metal forming and can be used in press machines for adjustment of clamping force during sheet forming. Device for control of sector clamp of die consists of hydraulic cylinders with controlled throttles, signal correction units, control units of degree of opening of controlled throttles, pressure sensors. At least one of hydraulic cylinders’ rods is connected with clamping sector, and working movement of rods is fixed by position sensor. At that, the numerical program control system sets the pressure in the hydraulic cylinder depending on the rod position, and their return to the initial position is carried out by the pneumohydraulic accumulator through the check valve.

EFFECT: result is creation of specified pressure force on all sections of workpiece surface.

1 cl, 2 dwg