Patent ID: 7097399
Filing Date: 2006-08-29
Classification: B23F,B23Q,Y10T

Abstract:
1. A hydraulic cutting machine for driving a cutting tool in relation to a workpiece, comprising: a support frame; a work table situated in relation to the support frame; a saddle supported by the support frame in relation to the work table; a spindle carried by the saddle for linear reciprocation, the spindle having an output end adapted for attachment to the cutting tool; a hydraulic cylinder integrally connected to the saddle; a piston slidably mounted in the hydraulic cylinder for linear reciprocation, the piston dividing the hydraulic cylinder into upper and lower chambers, the piston being connected to the spindle, the piston having opposed working faces of different working areas; a hydraulic passageway extending between an inlet port for connection to a hydraulic pressure source and an outlet port for connection to a hydraulic sump, the hydraulic passageway fluidically connected to the inlet port, the lower chamber, the upper chamber and the outlet port; a valve regulating hydraulic flow along the hydraulic passageway, the valve having a first state restricting hydraulic flow between the upper and lower chambers to hydraulically drive the piston and spindle in a first direction and a second state facilitating hydraulic flow between the upper and lower chambers to drive the piston and spindle in a second direction; and an electrical linear motor actuator acting upon the valve to control hydraulic actuation of the spindle.