Hydraulic circuit for linearly driving a machine-tool slider in both directions

A hydraulic circuit for linearly driving a machine-tool slider in both directions, comprising an hydraulic cylinder (5) whose piston rod (4) is connected to a slider that travels until a predetermined position for each pass of one or more passes of working operation of a workpiece to be bent, the hydraulic cylinder having two chambers (6, 7) in one of which there is the piston rod (4), both chambers, in order to be in high and low pressure alternatively, communicating with respective ducts (10, 11) of pressurized fluid fed from a reservoir by a pump (15), ducts (10, 11) on which a three-position four-way valve (18), a check valve (12-13), and in a bypass (190) between the last ones, a first throttling valve (19) operate, the throttling valve (19), that is operated to generate an increased pressure in a chamber (6, 7), which is at the moment in a low pressure, in order to slow down said slider in a first work motion when a programmable interval is approached from said first predetermined position for each working pass, characterized in that the hydraulic circuit comprises a second throttling valve (19′), which is mounted in a bypass (190′) symmetrically opposite to said first throttling valve (19) and operated to generate an increased pressure in said other chamber, which is at the moment in a low pressure, in order to slow down said slider in a second work motion when a programmable interval is approached from a second predetermined position for each working pass.