Mori Seiki Co., Ltd.

Satoshi Matsui

Kazuyuki Hiramoto

Akihiro Mochizuki

Shunsuke Nakazawa

The present invention provides a machine tool capable of reducing residual vibration occurring at the location time, thereby achieving responsiveness to a recent demand for higher acceleration/deceleration speed. The machine tool is configured such that a columnis fixed on a bed, a spindle headfor supporting a spindleis disposed on a front face' of the columnto be movable in a Z-axis direction, and a pair of right and left Z-axis ball screws (spindle drive shafts)for driving the vicinity of the gravity center of the spindle headis disposed on the front face&#x2032; of the columnto be symmetrical to each other with respect to a plane that includes an axis C of the spindle headand is parallel to a Y axis, thereby driving the vicinity of the gravity center of the spindle head

Machine tool

The present invention provides a machine tool whose width dimension is not increased even when it includes a tool magazine. The present invention includes: a bed; a saddle disposed on the bed to be movable in a forward and backward (Y-axis) direction in a front view of the machine tool; a table disposed on the saddle to be movable in right and left (X-axis) direction; a column fixed on the bed a spindle head disposed on the column to support a spindle and movable in a vertical (Z-axis) direction; an automatic tool changer disposed on a back face side of the column, wherein the column has an opening which allows the back face side and a front face side of the column to communicate with each other, and the automatic tool changer replaces a tool on the spindle side by a tool on a tool magazine side through the opening.

The present invention provides a machine tool capable of enhancing approachability to a spindle to improve work efficiency even when it includes a workpiece changer. The present invention includes: a bed; a saddle disposed on the bed to be movable in a forward and backward (Y-axis) direction in a front view of the machine tool; a table disposed on the saddle to be movable in a right and left (X-axis) direction; a column having a shape of a gate bridged over a travel range of the table and fixed on the bed; a spindle head disposed on the column to support a spindle and movable in a vertical (Z-axis) direction; a workpiece changer that turns a workpiece together with a pallet or turns the workpiece independently, for workpiece replacement, between a workpiece standby position set on a back face side of the bed and the table placed at a workpiece change position, the workpiece changer being disposed so as to set the workpiece change position at a position under the column.

The present invention provides a machine tool capable of achieving a higher feed rate of a spindle and weight reduction while ensuring necessary stiffness of a column. The present invention includes: a bed; a saddle disposed on the bed to be movable in a Y-axis direction in a front view of the machine; a table disposed on the saddle to be movable in an X-axis direction; a column having a shape of a gate that is bridged over a travel range of the table and has right and left legs fixed on the bed and a beam connecting tops of the right and left legs; and a spindle head disposed on a front face of the beam to be movable in a Z-axis direction.

The present invention provides a machine tool capable of enhancing chip discharge efficiency and improving work efficiency with improved approachability to a spindle. A machine tool according to the present invention is structured such that a recessionwith a back face side and an upper face side thereof opened is formed at a center portion of a bed, Y-axis guide railsand Y-axis ball screws (drive shafts)for guiding and driving the saddleare disposed on right and left saddle supports (edges)of the recessionand are covered with right and left Y-axis cutting covers, the right and left Y-axis cutting coversare formed in an inclined shape with the recessionside thereof becoming lower, and a chip receptorfor discharging chips dropped into the recessionto a back face side of the bedis disposed in the recession

According to the present invention, there is provided a vertical machining center ( ) which has working regions (&agr;, &bgr;) separable by a partition plate (P), and comprises a spindle head ( ) adapted to move within one of the working regions (&agr;, &bgr;) separated by the partition plate (P) in a first machining mode and to move across the working regions (&agr;, &bgr;) not separate by the partition plate (P) in a second machining mode, and a stopper ( ) which prevents the spindle head ( ) from moving from the one working region into the other working region in the first machining mode and permits the spindle head ( ) to move between the working regions (&agr;, &bgr;) in the second machining mode. The stopper ( ) includes a movable stopper member ( ) attached to a saddle ( ) and stationary stopper members ( ) attached to a bed ( ). With this arrangement, machining ranges to be defined in the respective working regions can be maximized without the need for consideration of the coasting distance of the saddle at abnormal stoppage.

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Yamatokoriyama, Japan

Satoshi Matsui