| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To constitute a hydraulic means to change the operating direction of a tool with higher frequency than conventional frequency in a machine tool wherein the tool is fed by inching in a foward direction by the hydraulic means. <P>SOLUTION: A feeding hydraulic circuit 11 forms a closed circuit by communicating a four-port three-position selector valve 31 communicating with an operating fluid supply source, with the head side 6 of a cylinder 4 by a line 51, communicating the rod side 7 of the cylinder 4 with a flow control valve 21 by a line 52, and communicating the flow control valve 21 with the four-port three-position selector valve 31 by a line 53. A booster 12 is piped in this closed circuit in a state of connecting an input port 14 to the line 51 by a line 54, connecting an output port 15 to the line 52 by a line 55 and connecting a discharge port 16 to the line 53 by a line 56. The booster 12 is constituted as an operating fluid intensifier comprising a booster piston 61 constituted as a different diameter piston, spring type check valves 69, 71, 76 and a control valve 72. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
