Micron Machinery Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Mohee Sagae

Satoshi Kobayashi

Yoshihiro Minagawa

Masaaki Sato

Yukio Yamaguchi

Shuji Yamamoto

Norihiko Nakajima

Kazuhiko Yokogawa

Katsuyuki Takeda

Katsuhiko Hashizume

Tokufumi Takeuchi

Masayuki Kuwata

Satoshi Ebina

Hiroki Suzuki

Jinzo Yabe

The handpiece-type high-frequency vibration apparatus includes a roughly cylindrical housingconfiguring a handpiece, a holding member, a tool, a controllerand an excitation device. In a non-contact state before the toolis brought into contact with an object, the controllerdrives the excitation deviceso as to vibrate the toolat an added frequency fp for which a predetermined frequency fs is added to a first resonance frequency frof the tool. In a cutting state where the toolis in contact with the object by a load that enables cutting of the object by the tool, the controllercontrols drive of the excitation devicesuch that a third resonance frequency frof the toolincreases and coincides with the added frequency fp, and increases a vibration frequency of the tool

Method for vibrating handpiece-type high-frequency vibration apparatus

A handpiece-type high-frequency vibration cutting device includes a housing (); a vibration device (); a holding member (); a tool (); and a controller () to control the operations of the vibration device (). The controller () controls the vibration of the tool () due to the vibration device () such that the vibration is burst oscillation in which vibration and stop of vibration are repeated. The controller () also controls the entire burst frequency f1 of the tool () to be included in the range of 1 to 8 [Hz], one cycle of the burst frequency f1 including a burst period with the holding member () vibrating and a stop period with the tool () not vibrating. The controller () also controls the vibration frequency f2 of the tool () during the burst period such that the vibration frequency f2 is in the range of 20 to 60 [kHz].

Handpiece-type high-frequency vibration cutting device

When a work W rotates counterclockwise about an axis Oand is subjected to infeed grinding by a regulating wheel () which rotates clockwise about an axis Oand a grinding wheel () which rotates clockwise about an axis O, a load F acting on a blade (), a load acting on the work W supported by the blade (), and a load operating position y in the blade () at any given time are measured by a controller () based on the outputs of a first stress sensor Sand a second stress sensor Sand according to the correlation information stored in a storage device. If the component of a specified frequency extracted by performing frequency analysis of the time series of the load exceeds a threshold value, then designation processing is carried out to reduce the component of the designated frequency to the threshold value or less.

Centerless grinding apparatus and work grinding condition monitoring method

In centerless grinding there are the in-feed and the through-feed scheme, each having their respective advantages and disadvantages. When a work being machined by centerless grinding has plural portions being machined, those portions can be distinguished as portions being machined suitable for in-feed and portions being machined suitable for through-feed. Then, the present invention, using the same centerless machine, performs through-feed grinding in the first half of the process, then automatically switches from that and performs in-feed grinding in the latter half of the process. Thus, in a single piece of work being machined, sites suited to through-feed grinding are subjected to through-feed grinding, and sites suited to in-feed grinding are subjected to in-feed grinding. Not only so, but it is unnecessary to alter the setup between the first half of the process and the latter half of the process, wherefore centerless grinding can be performed very efficiently.

Through-in grinding method and through-in grinding apparatus

Machining apparatus for machining a workpiece with a machining tool, including a work holder for holding the workpiece, and a cold gas stream supply device including a cooling gas nozzle through which a cold gas stream is supplied to a machining point, and wherein the cooling gas nozzle is provided on the work holder, and the cold gas stream has a temperature lower than an ambient temperature of the apparatus. The apparatus may be a centerless grinding apparatus including a regulating wheel for rotating the workpiece, and a work rest blade cooperating with the regulating wheel to rotatably support the workpiece so that the workpiece is ground by a grinding wheel while the workpiece is held by the work holder between the regulating and grinding wheels. The cooling gas nozzle is desirably positioned such that a distance between the exit end of the cooling gas nozzle and the grinding point is not larger than a diameter of the workpiece. Also disclosed are machining process and cooling method and device using the cold gas stream.

Machining apparatus and process using cold gas stream, and cold gas

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Yamagata, Japan

Mohee Sagae