Denso Corporation

Takayoshi Muto

Hisatoshi Kojima

Hiromichi Morita

Sojiro Tsuchiya

Goshin Ohashi

Hironao Yamada

In a machine tool by pulse drive of a hydraulic system, a piston of a hydraulic cylinder is connected with a table, and an outflow valve and an inflow valve, which form a pair, are respectively connected with a right and a left hydraulic chamber. When the feed table is moved to the right, for example, control is conducted so that the valve-opening period of one valve can be a portion in the middle of the valve-opening period of the other valve. Since a portion of pressure in the hydraulic chamber is canceled, an effective pressure, the pulse width of which is narrow, remains. Accordingly, even in the case where a common inexpensive electromagnetic valve is used, it is possible to accomplish a smooth feed motion.

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Gifu, Japan

Takayoshi Muto