Provided is an ultrasonic vibration processing device which can suppress vibration of components due to an ultrasonic vibrator and can perform processing using ultrasonic vibration in a preferable manner; the ultrasonic vibration processing device includes: a housing (10); an ultrasonic vibrator (20) including a horn portion (21A) to which a tool holder (70) is detachably attached and a piezoelectric element (23), the ultrasonic vibrator having a rear end located at a node of ultrasonic vibration and being supported inside the housing (10) so as to be rotatable; a connecting portion (30) stored in the housing (10) so as to be rotatable together with the ultrasonic vibrator (20); a motor (40) connected to the connecting portion (30); and a non-contact power supply unit (50) including a primary transformer (51) and a secondary transformer (52), the primary transformer (51) being fixed to the housing (10) and including a primary coil (51B) that receives high frequency power from an external power supply, the secondary transformer (52) being connected to the rear end of the ultrasonic vibrator (20) with a clearance maintained between the secondary transformer (52) and the primary transformer (51) and including a secondary coil (52B) that supplies an induced electromotive force to the piezoelectric element (23).

A method and apparatus for delivering workpieces to and from a machine table. This invention also relates to an apparatus for receiving at the machine table workpieces which are delivered to and retrieved by the delivery system. Carts move with respect to a surface, such as a floor surface. The carts move and deliver pallets to a loading station that uses a loading arm to deliver pallets with workpieces to and from a machine table.

A method and apparatus for delivering workpieces to and from a machine table. This invention also relates to an apparatus for receiving at the machine table workpieces which are delivered to and retrieved by the delivery system. Carts move with respect to a surface, such as a floor surface. The carts move and deliver pallets to a loading station that uses a loading arm to deliver pallets with workpieces to and from a machine table.

The present invention relates to a slanting-bed feed processing machine tool of a large propeller. The machine tool comprises a slanting column feed bed, a machine tool spindle, a workpiece rotary worktable, a large propeller and a bed feed mechanism. The present invention coordinates the geometrical relationship between the machine tool and the large propeller to ensure that the slanting column feed bed moves between two blades, thereby reducing the overhang length of the spindle. Different forms of workpiece rotary worktables and bed feed mechanisms are selected according to different slanting column feed beds. Four types of slanting column feed beds are designed, which can be selected, optimized and applied for different processing objects. The present invention enhances the processing stiffness of the spindle and solves the problem of poor processing quality of the large propeller caused by machine tool vibration.

The present invention relates to a slanting-bed feed processing machine tool of a large propeller. The machine tool comprises a slanting column feed bed, a machine tool spindle, a workpiece rotary worktable, a large propeller and a bed feed mechanism. The present invention coordinates the geometrical relationship between the machine tool and the large propeller to ensure that the slanting column feed bed moves between two blades, thereby reducing the overhang length of the spindle. Different forms of workpiece rotary worktables and bed feed mechanisms are selected according to different slanting column feed beds. Four types of slanting column feed beds are designed, which can be selected, optimized and applied for different processing objects. The present invention enhances the processing stiffness of the spindle and solves the problem of poor processing quality of the large propeller caused by machine tool vibration.

An electrical machining method comprises machining a workpiece by an electrical machining device comprising an electrode; increasing a feedrate of the electrode at a first acceleration if a discharge current passing through the electrode and the workpiece is lower than a discharge current reference; and decreasing the feedrate of the electrode at a second acceleration if the discharge current is higher than the discharge current reference, wherein the second acceleration has an absolute value higher than that of the first acceleration.

An electrical machining method comprises machining a workpiece by an electrical machining device comprising an electrode; increasing a feedrate of the electrode at a first acceleration if a discharge current passing through the electrode and the workpiece is lower than a discharge current reference; and decreasing the feedrate of the electrode at a second acceleration if the discharge current is higher than the discharge current reference, wherein the second acceleration has an absolute value higher than that of the first acceleration.

A linear drive mechanism which moves a detector having sensitivity in a first axial direction, relatively to a workpiece in a second axial direction orthogonal to the first axial direction, the linear drive mechanism includes: a drive shaft extending in the second axial direction; a mover which is supported in a non-contact fashion by the drive shaft and configured to move along the drive shaft integrally with the detector or the workpiece; a guide provided at a position deviated relative to the drive shaft in a third axial direction orthogonal to both the first axial direction and the second axial direction, the guide parallel to the drive shaft; and a resistance force generator which is provided on one of the mover and the guide, and is in contact with the other of the mover and the guide, the resistance force generator generates a resistance force which resists against movement of the mover.

The present invention relates to a machining center, and more specifically to a horizontal multi-spindle machining center, in which 2-axis (Y- and Z-axis) or 3-axis (X-, Y- and Z-axis) transfer drive units are disposed in the machining center installed to machine workpieces, in which a ram equipped with spindles is moved in the up-down, front-back, and/or left-right directions of the workpieces, in which the spindles are configured to include a plurality of spindles, i.e., 2 to 8 spindles, so that a plurality of workpieces may be machined simultaneously, and in which tool change is simultaneously performed for tools fastened to the plurality of spindles and configured to machine workpieces by using an auto tool changer (ATC), so that tool change speed may be improved and thus manufacturing efficiency may be improved.

The present invention relates to a machining center, and more specifically to a horizontal multi-spindle machining center, in which 2-axis (Y- and Z-axis) or 3-axis (X-, Y- and Z-axis) transfer drive units are disposed in the machining center installed to machine workpieces, in which a ram equipped with spindles is moved in the up-down, front-back, and/or left-right directions of the workpieces, in which the spindles are configured to include a plurality of spindles, i.e., 2 to 8 spindles, so that a plurality of workpieces may be machined simultaneously, and in which tool change is simultaneously performed for tools fastened to the plurality of spindles and configured to machine workpieces by using an auto tool changer (ATC), so that tool change speed may be improved and thus manufacturing efficiency may be improved.