A combined type angle head milling cutter is configured to machine mounting faces of an axial bearing. The combined type angle head milling cutter includes an angle head body, a lock nut, first slotted countersunk head screws, a first hexagon socket head cap screw, a first flat key, semicircle seal covers, first angular contact ball bearings, a cutter handle shaft lower adjusting pad, a cutter handle shaft, a cutter handle shaft upper adjusting pad, a bearing cover plate, a first bevel gear, a first spring washer, a second bevel gear, a bevel gear adjusting pad, an orientation shaft, cutter shaft inner-side seal covers, second hexagon socket head cap screws, a cutter shaft outer-side seal cover, a second slotted countersunk head screw, a small seal ring and the like.

A spindle-bearing protecting device for protecting a bearing that supports a spindle so as to be rotatable, includes: a rotating part positioned further to an outer side in an axial direction than the bearing, and having a rotor blade configured to rotate along with the spindle; a supply part configured to supply coolant or lubricant between the rotor blade and the bearing; a detection unit configured to detect abnormality of the bearing; and a control unit configured to control a supply of the coolant or the lubricant by the supply part and a revolution speed of the spindle, in a case where the detection unit detects abnormality of the bearing.

The machine tool comprises a headstock provided with a main spindle; a driving unit which moves the headstock in a main spindle axial direction and has a feed mechanism extended in the main spindle axial direction and a front end supporter which rotatably supports a front end of the feed mechanism; a first front cover mounted on the headstock in a first position between the main spindle and the feed mechanism with respect to a diameter direction from a main spindle axis toward the feed mechanism; and a second front cover mounted on the front end supporter in a second position between the main spindle and the feed mechanism. Part of the feed mechanism is covered by both of the first front cover and the second front cover when at least part of the first front cover is on the rear side of the second front cover.

A rotary table apparatus includes a rotary table body, a table rotor supported on the rotary table body and configured to be rotatable, a driving unit for driving the table rotor, a seal mechanism including a sealer disposed between the rotary table body and the table rotor, and a first supply unit configured to supply clean fluid for use in machining to the seal mechanism.

A rotation table mounted on a machining table of a machine tool includes a clamping mechanism which is driven by air so as to clamp a rotation shaft, and an air purging pressure is applied into a casing so as to prevent a cutting fluid or foreign matter from intruding into the casing of the rotation table. Then, air discharged from the clamping mechanism does not pass through the casing, to which the air purging pressure is applied, and is discharged to the outside of the rotation table through a flow passage.

A chip suction cover is used for a machine tool including: a spindle configured to rotate a tool; and a suction mechanism unit configured to suck chips of a workpiece that are produced in accordance with rotation of the tool. The chip suction cover includes: a hollow body that is provided with an opening through which a rotation central axis of the spindle extends and that is arranged so as to surround the tool; and a cover body that is provided in the hollow body so as to partially close the opening and that is configured to cover a part of a tip end portion of the tool while exposing a remaining part of the tip end portion of the tool. A chip suction cover having such a configuration that improves the efficiency of sucking chips produced due to workpiece machining is provided.

The present invention relates to embodiments of a machine tool, in particular a multi-spindle milling machine, comprise a machine frame, a workpiece clamping device for clamping a workpiece, an axis slide assembly arranged on the machine frame, and a spindle carrier assembly which is arranged on the machine frame and has at least two tool-carrying work spindles. The axis slide assembly is configured to linearly move the workpiece clamped at the workpiece clamping device by way of three controllable linear axes X, Y and Z. The work spindles are arranged at a turret which can be rotated or swiveled about a turret axis at respectively equal distance from the turret axis, and the spindle axes of the work spindles are aligned or can be aligned in parallel to one another and in parallel to the turret axis.

A rotation mechanism includes: a housing; a shaft inserted through a hole provided at the housing; bearings installed at the housing and rotatably supporting the shaft; a rotary member provided at one end portion of the shaft, adapted to be rotated together with the shaft, and having a portion that projects to a radially outer side of the hole and faces the housing with a gap having a predetermined size; and a gas passage adapted to connect the gap to outside of the housing and allow gas contained in a portion of the gap to pass to the outside of the housing.

A work-machine splash guard for enclosing a space for machining a workpiece, and preventing the spraying of chips and machining fluid, is equipped with: a front-surface door for opening and closing in the horizontal direction via an arc-shaped movement, and positioned on the front-surface side of the work machine; a side-surface door for opening and closing by performing an arc-shaped movement that is concentric with the front-surface door, and overlapping with the front-surface door; and door-locking switches for selectively allowing the opening/closing of the front-surface door and the side-surface door according to an opening/closing pattern.