Aisin Aw Co., Ltd.

Pascal Engineering Corporation

Masato Sakakibara

Takao Kobayashi

Takao Taniguchi

Takayuki Kuroda

Shigeharu Ikeda

Takayuki Munechika

Kazutaka Murai

Shigeto Noma

Hiroshi Osada

Minoru Hidaka

Tomoyoshi Sato

Hironao Kinpara

Yoshiyuki Yamaguchi

An apparatus for measuring dynamic rigidity of a main shaft of a machine tool with high accuracy. The apparatus includes an unbalanced master that is attached to the main shaft and of which position of a center of gravity is offset with respect to a center of rotation of the main shaft; a tachometer that measures a rotational speed of the main shaft; and a run-out amount measuring device that is positioned so as to face the unbalanced master at a predetermined position in an axial direction and is any given position in a circumferential direction, and that measures an amount of run-out of the unbalanced master. The dynamic rigidity of the main shaft is calculated based on a relation between the rotational speed measured by the tachometer and the amount of run-out measured by the run-out amount measuring device.

Apparatus and method for measuring dynamic rigidity of a main shaft of a machine tool

A clamping device is capable of engaging a clamping object with an inner wall of hole or side wall of the clamping object. The clamping deviceis provided with a rod support for moving an engagement portionof a clamping rodin a direction roughly rectangular to the longitudinal direction of the clamping rodand switchably rotatably supports the clamping rodin a clamping main body across a clamping position and a clamp release position, a piston drive mechanismfor driving a pistonacross the clamping position and the clamp release position, and a cam mechanismfor driving the engagement portionin the clamping direction by the driving force of piston drive mechanismfor driving the pistonto the clamping position.

Clamping device

Machining coolant/lubricant is used to operate a piston of a clamping-side coupler by feeding same via a coolant feed passage to a clamping pressure chamber through a first check valve and a clamping pressure fluid passage. The same coolant/lubricant is discharged from an unclamping pressure chamber through an unclamping pressure fluid passage and a second check valve. The resulting movement of the piston downwards brings a clamp member into contact with a workpiece to thereby clamp the workpiece on a table. Thus, a dedicated pressure source for clamping can be dispensed with.

Machining apparatus with coolant-operated clamp device

Growing community of inventors

Anjo, Japan

Masato Sakakibara