A tool spindle for machine tool includes a tool spindle having a front end in which a tool is mounted and installed to be rotatable, and a vibration damping device mounted in a rear end of the tool spindle to damp cutting vibration generated at the front end of the tool spindle, and including a rigid member coupled to the rear end of the tool spindle and a tuned mass member elastically supported by the rigid member.

A processing apparatus includes a processing unit, a control unit, and a temperature detecting unit. The processing unit includes a cutting blade and a spindle assembly, the spindle assembly including a spindle having the cutting blade mounted on a distal end of the spindle and a spindle housing through which the spindle is inserted. A cooling fluid passage is formed in the spindle housing, the cooling fluid passage cooling the spindle assembly, and having one end connected to a cooling fluid supply source and having another end communicating with a cooling fluid outlet of the spindle housing. The temperature detecting unit detects the temperature of the spindle housing. The control unit determines whether a state of cooling of the spindle assembly is normal or abnormal on the basis of the temperature detected by the temperature detecting unit.

A machine tool (1) includes a spindle (32) supported on a support surface (37a) of a support body (37) with such an orientation that the longitudinal axis of the spindle extends along the support surface (37a). The spindle (32) is movable in a vertical direction that is perpendicular to the longitudinal axis of the spindle (32). The support body (37) is provided with a ventilation hole (80) extending through the support body (37) between the support surface (37a) and a surface (37b) facing in the direction opposite to the support surface (37a), to open toward the spindle (32).

A spindle device is mountable with a tool holder, and includes a rotating spindle rotatably mounted to a spindle main body and extending axially to have an axial end surface. A contactless power transmission module is disposed on a flange end surface of the spindle main body and an outer peripheral wall of the rotating spindle for supplying power. An electrically connecting module includes two conductive units each disposed in the rotating spindle and electrically connected with the power transmission module. Each conductive unit has an electrically conductive post extending axially and exposed from the axial end surface for conducting the power to the tool holder.

A spindle device of a machine tool is provided with: a rear-side bearing and front-side bearings which rotatably support a spindle with respect to a housing; a built-in motor which is disposed around the spindle between the front-side bearings and the rear-side bearing; heat pipes which are embedded in the spindle and which transmit heat between the central part and the rear-end part of the spindle; a plurality of plate-like inner fins which are affixed to a rear part of the spindle that protrudes rearward of the rear-side bearing and which extend perpendicularly with respect to the rotation axis of the spindle; and a plurality of plate-like outer fins which are affixed to the housing and which are disposed between the plurality of inner fins in such a manner as not to contact the inner fins.

A processing apparatus includes a processing unit, a control unit, and a temperature detecting unit. The processing unit includes a cutting blade and a spindle assembly, the spindle assembly including a spindle having the cutting blade mounted on a distal end of the spindle and a spindle housing through which the spindle is inserted. A cooling fluid passage is formed in the spindle housing, the cooling fluid passage cooling the spindle assembly, and having one end connected to a cooling fluid supply source and having another end communicating with a cooling fluid outlet of the spindle housing. The temperature detecting unit detects the temperature of the spindle housing. The control unit determines whether a state of cooling of the spindle assembly is normal or abnormal on the basis of the temperature detected by the temperature detecting unit.

A main spindle device (10) for a machine tool that checks the seating of a tool holder (30) using compressed air, wherein the main spindle device (10) for a machine tool comprises: a main spindle (12) that has a distal end face (18) in close contact with a flange end of the tool holder (30); an annular recess (25) that is formed on the distal end face (18) of the main spindle so as to be covered by the flange end of the tool holder; an air supply flow channel (21) that is linked to the annular recess and that supplies compressed air to the annular recess; a compressed air source (23) that supplies air to the air supply flow channel; and a pressure detector (22) that detects the pressure of the compressed air in the air supply flow channel. The annular recess (25) has a first section (25a) and a second section (25b) that is deeper than the first section, and the air supply flow channel is opened to the second section (25b).

The main spindle unit has a main spindle, a front bearing, a rear bearing, a front case for covering the front bearing, and a rear case for covering the rear bearing. The front case has a front body part for holding the front bearing and a front flange part extending radially outward from the front body part. The rear case has a rear body part for holding the rear bearing and a rear flange part extending radially outward from the rear body part. A front mounted surface, which can be brought into contact with a first mounting surface of a unit support table, is formed on the front flange part so as to face the front side thereof. A rear mounted surface, which contacts a second mounting surface of the unit support table, is formed on the rear flange part so as to face the front side thereof.

The inventive working spindle comprises a spindle housing and a spindle shaft with axial positioning surface and axial contact surface by which the correct axial position of each fitting provided spindle shaft in the spindle housing is obtained. For torque-proof holding of the spindle shaft in the spindle housing, preferably with stationary motor, a braking unit is provided that comprises a radial outer part that is coupled with the spindle housing in a torque-proof manner and a radial inner part that is coupled with the spindle shaft in a torque-proof manner. The largest outer diameter of the peripheral surface of the inner part is smaller than the narrowest location of the through-opening of the spindle housing between the braking unit and the tool side end of the spindle housing. For this reason the spindle shaft can be readily removed from the spindle housing without disassembly measures of the braking unit, if required, and can be reinserted in reverse route. The inventive working spindle is simply constructed and can be versatilely used. Concurrently it is remarkably easy to maintain.

The main spindle unit has a main spindle, a front bearing, a rear bearing, a front case for covering the front bearing, and a rear case for covering the rear bearing. The front case has a front body part for holding the front bearing and a front flange part extending radially outward from the front body part. The rear case has a rear body part for holding the rear bearing and a rear flange part extending radially outward from the rear body part. A front mounted surface, which can be brought into contact with a first mounting surface of a unit support table, is formed on the front flange part so as to face the front side thereof. A rear mounted surface, which contacts a second mounting surface of the unit support table, is formed on the rear flange part so as to face the front side thereof.