Toyoda Koki Kabushiki Kaisha

Jtekt Corporation

Makoto Nonoyama

Toshihiro Yonezu

Yutaka Hayashi

Toshio Maruyama

Shoichi Sano

Tomonari Kato

Yoshitaro Osaki

Keita Goto

Manabu Kuribayashi

Masakazu Yamaguchi

Kenzaburo Oishi

Yukiharu Tsuchiya

Nobuo Ohkubo

An apparatus and method for grinding a workpiece by rotating the workpiece about a rotational axis, rotating a cylindrical grinding wheel about a rotational axis being parallel to the rotational axis of the workpiece, moving the grinding wheel relative to the workpiece at least in one of a first direction being perpendicular to the rotational axis of the workpiece for grinding the workpiece at a cylindrical surface of the grinding wheel and a second direction being parallel to the rotational axis of the workpiece for grinding the workpiece at an end surface of the grinding wheel being perpendicular to the rotational axis of the grinding wheel, and by superimposing a vibration signal including a plurality of frequency components to a driving signal outputted to one of a workpiece rotating means for rotating the workpiece and a grinding wheel rotating means for rotating the grinding wheel.

Apparatus and method for grinding workpiece

A grinding method comprises steps of simultaneously grinding plural grinding portions of a workpiece by plural grinding wheels T, Tmoved individually each other, and terminating said grinding by a predetermined grinding wheel Tprior to a termination of said grinding by the other grinding wheel T. Whereby, a content of the grinding by each grinding wheel T, Tcan be same. A grinding condition in each grinding by each grinding wheel T, Tcan be changed in accordance with a measuring result of the grinding portion in the grinding.

Method of grinding

A machining apparatus for machining a workpiece by moving a tool in direction relative to the workpiece comprises, tool moving means for moving the tool in the direction relative to the workpiece, tool movable range setting means for setting a movable range for the tool to inhibit the workplace from exceeding a reference size by inputting the reference size, and halting means for halting a movement of the tool when a position of said tool exceeds the tool movable range set by said tool movable range setting means.

Method for machining a workpiece by renewing a tool movable range

A numerically controlled grinding machine of the present invention grinds a cylindrical surface of a workpiece by a relative movement between the workpiece and a grinding wheel. The grinding conditions such as a grinding method and a finishing diameter of the workpiece are inputted so that data necessary for grinding the Workpiece are automatically determined in dependence upon the grinding conditions. The automatically determined grinding data are displayed on a display means. The grinding data displayed on the display means are modified by one of the four rules of arithmetic. The modification are carried out in accordance with a compensation rate set by override switch and the like or a compensation value inputted by a key operation.

Numerically controlled grinding machine

A spindle apparatus for supporting and rotating a workpiece in a grinder. The spindle apparatus includes a workpiece spindle rotatably supported on a spindle head and driven for rotation by a motor, and a spindle plate mounted to the front end of the workpiece spindle and including an eccentric drive pin. The workpiece spindle has a bore in which a ram is axially movable. A center is fit in the front end of the ram. A unit is provided to advance the ram to engage with one end of the workpiece when the workpiece is to be supported. A rotary sleeve is rotatably supported on the front end of the ram and includes an engagement portion which is displaceable in the axial direction of the spindle and engageable with the drive pin in the direction of rotation. A driving unit is mounted to the front of the rotary sleeve to engage the workpiece in the direction of rotation when the ram is in its advanced position to thereby transmit rotation.

Spindle apparatus for supporting and rotating a workpiece

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Kariya, Japan

Makoto Nonoyama