Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Hidekazu Azuma

Masahiro Hayashi

Hirohisa Miura

Toshio Natsume

Hidenori Katagiri

Takatoshi Suzuki

Hiroshi Satou

Kazutaka Ogo

Kazuki Watanabe

Takayuki Tsuruhashi

Katsuiku Hokao

Ryozi Yoshinaka

An apparatus for discriminating a machining state from a non-machining state in a machine tool wherein a workpiece is machined with a cutting tool or grinder, comprising plural vibration sensors including at least one acoustic-emission sensor, which detect vibrations of different frequency bands, respectively, which are produced during machining of the workpiece by the tool. A discriminating device judges that the workpiece is being machined by the tool when levels of output signals generated from at least two of the vibration sensors are higher than respective predetermined threshold levels, and judges that the workpiece is not being machined by the tool when the level of an output signal generated from less than two of the vibration sensors is higher than a predetermined threshold level. Also disclosed is a method for discrimination between the machining and non-machining states.

Method and apparatus for discriminating cutting state from non-cutting

A magnetic fluid having a base liquid and magnetic particles with so small average particle diameter as to be of some hundreds of angstroms dispersed in the base liquid. Such a magnetic fluid is produced by ejecting a molten magnetic metal adiabatically from an expansion nozzle against a bath of a base liquid.

Magnetic fluid incorporating fine magnetic powder and method for making

Growing community of inventors

Nagoya, Japan

Hidekazu Azuma