Toyoda Koki Kabushiki Kaisha

Yutaka Hayashi

Makoto Nonoyama

Takao Yoneda

Tomoyasu Imai

Koji Nishi

Masahiro Ido

Yasuji Sakakibara

Toshihiro Yonezu

Tomonari Kato

Naoki Arimoto

Moriaki Sakakura

Mamoru Katsuta

Masashi Yamanaka

Hisashi Nakamura

Ryouhei Mukai

Eiji Fukuta

Hideki Nagano

Satoshi Yamaguchi

Nobuo Ohkubo

A grinding wheel is for use in a grinding machine, and is attached on a wheel spindle of the grinding machine for simultaneously grinding at least two parts of a workpiece. The grinding wheel includes at least two wheel cores. Each of wheel cores has a disk-like shape. An abrasive layer is disposed on a circumferential surface of each of the wheel cores. A spacer portion is inseparably fixed on at least one of the wheel cores for keeping a space between the abrasive layers of the wheel cores. And a first labyrinth portion located on one of side surfaces of one of the wheel cores for forming a labyrinth seal with a second labyrinth portion arranged on the grinding machine. The number of separable parts of the grinding wheel are extremely decreased in consideration of imbalance of every part. The spacer portion is integral with at least one of the wheel cores. Since the grinding wheel is easily accurately balanced, vibration of the grinding wheel is decreased and stability is enhanced when the wheel spindle is driven at very high speed. As a result, machining accuracy for grinding is enhanced.

Grinding wheel with at least two wheel cores for circumferential 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

An apparatus capable of automatically determining grinding wheel dressing timing for dressing a grinding wheel. The apparatus estimates the abrasion of the grinding wheel in a grinding cycle on the basis of machining data and grinding conditions, and divides the grinding cycle into a plurality of stages according to the estimated abrasion to carry out grinding wheel dressing after the completion of every stage of the grinding cycle. In grinding a workpiece having a plurality of ground sections, the abrasion of the grinding wheel in grinding each ground section is estimated, and the abrasion is accumulated in accordance with grinding sequence. A ground section after grinding which grinding wheel dressing is to be carried out is determined on the basis of the cumulative abrasion. Similarly, the abrasions are accumulated for each of workpieces. A grinding wheel dressing is carried out after the completion of grinding a workpiece so that the cumulative abrasion may not exceed a predetermined value.

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Chiryu, Japan

Yutaka Hayashi