A hole inner-surface cutting apparatus includes a working head composed of a rotatable body having a cutting tool and a main body, a rotation rod for rotating the rotatable body, and a stroke rod for stroking the working head. At least three positioning mechanisms for positioning the working head along a radial direction in the penetrating hole is provided on the main body. Each of the positioning mechanisms has three sliders arranged radially, guide rollers respectively disposed on distal ends of the sliders, a piston for pressing the sliders radially outward, and a fluid pressure chamber for actuating the piston. Further provided is a controller for controlling fluid pressures in the fluid pressure chambers of the positioning mechanisms independently from each other.

A hole inner-surface cutting apparatus includes a working head composed of a rotatable body having a cutting tool and a main body, a rotation rod for rotating the rotatable body, and a stroke rod for stroking the working head. At least three positioning mechanisms for positioning the working head along a radial direction in the penetrating hole is provided on the main body. Each of the positioning mechanisms has three sliders arranged radially, guide rollers respectively disposed on distal ends of the sliders, a piston for pressing the sliders radially outward, and a fluid pressure chamber for actuating the piston. Further provided is a controller for controlling fluid pressures in the fluid pressure chambers of the positioning mechanisms independently from each other.

An apparatus and method are provided for integration of drilling and interference-fit pin insertion. The apparatus includes a station switching module, a spindle module, and a pin insertion module. The station switching module is configured to drill and countersink a panel connecting hole. The pin insertion module is configured for interference-fit pin insertion of a hi-lock bolt. Hence, by using the apparatus, after the drilling of a hole to be drilled is completed, the station switching module is rotated by a fixed angle so that station states of the spindle module and the pin insertion module can be switched, the interference-fit pin insertion of the hi-lock bolts can be completed, and the anti-fatigue property and assembly efficiency can be improved.

An apparatus and method are provided for integration of drilling and interference-fit pin insertion. The apparatus includes a station switching module, a spindle module, and a pin insertion module. The station switching module is configured to drill and countersink a panel connecting hole. The pin insertion module is configured for interference-fit pin insertion of a hi-lock bolt. Hence, by using the apparatus, after the drilling of a hole to be drilled is completed, the station switching module is rotated by a fixed angle so that station states of the spindle module and the pin insertion module can be switched, the interference-fit pin insertion of the hi-lock bolts can be completed, and the anti-fatigue property and assembly efficiency can be improved.

A machining apparatus capable of drilling a long workpiece from an end surface of a diameter-expanded part and drilling a short workpiece from an end surface of a stem part without inverting orientation of a collet and a sleeve in a chuck device is provided, as well as a method of using the same, and a chuck device for the machining apparatus. A deep hole drilling machine and a chuck device are included with a sleeve and a collet included inside the chuck device, and the collet and the sleeve each have both end openings opened toward the outside of the chuck device. The opening on one end side of each of the sleeve and the collet is directed to the deep hole drilling machine, and the collet is disposed on the other end side of the sleeve.

A machining apparatus capable of drilling a long workpiece from an end surface of a diameter-expanded part and drilling a short workpiece from an end surface of a stem part without inverting orientation of a collet and a sleeve in a chuck device is provided, as well as a method of using the same, and a chuck device for the machining apparatus. A deep hole drilling machine and a chuck device are included with a sleeve and a collet included inside the chuck device, and the collet and the sleeve each have both end openings opened toward the outside of the chuck device. The opening on one end side of each of the sleeve and the collet is directed to the deep hole drilling machine, and the collet is disposed on the other end side of the sleeve.

A drill is a long drill that is provided with a discharge groove having a helix angle of 25 degrees, in which a groove length is 30D or more. Thinning processing is performed on a leading end portion of the drill and a gash portion that is connected to the discharge groove further to an inner side in the radial direction than an outer peripheral surface. A circular arc groove is formed in a section connecting a thinning face and a gash face, and a chip discharge performance is improved. When forming a deep hole, in a guide hole forming process, a guide hole with an inner diameter d of D+0.03 mm or less and with a depth W of 3D or more, is formed (S2 to S6). In an insertion process, the drill is rotated in a reverse direction and is inserted into the guide hole to a position just before a bottom portion of the guide hole (S11 to S13). In a deep hole forming process, the drill is rotated in a positive direction, cutting is performed from the bottom portion of the guide hole, and a deep hole is formed (S16 to S18).

A drill is a long drill that is provided with a discharge groove having a helix angle of 25 degrees, in which a groove length is 30D or more. Thinning processing is performed on a leading end portion of the drill and a gash portion that is connected to the discharge groove further to an inner side in the radial direction than an outer peripheral surface. A circular arc groove is formed in a section connecting a thinning face and a gash face, and a chip discharge performance is improved. When forming a deep hole, in a guide hole forming process, a guide hole with an inner diameter d of D+0.03 mm or less and with a depth W of 3D or more, is formed (S2 to S6). In an insertion process, the drill is rotated in a reverse direction and is inserted into the guide hole to a position just before a bottom portion of the guide hole (S11 to S13). In a deep hole forming process, the drill is rotated in a positive direction, cutting is performed from the bottom portion of the guide hole, and a deep hole is formed (S16 to S18).

A toolbar with a longitudinal axis and a machining tool for machining a workpiece, the toolbar comprising at least one accelerometer configured to generate an electric signal proportional to the velocity of the toolbar along a direction; at least one piezoelectric actuator; and a control logic unit, operatively connected to the at least one accelerometer and to the at least one piezoelectric actuator, wherein control logic unit is configured to drive the at least one piezoelectric actuator by a driving signal proportional to the velocity derived from at least one accelerometer adapted to compensate the torque and the vibrations on the toolbar.

A toolbar with a longitudinal axis and a machining tool for machining a workpiece, the toolbar comprising at least one accelerometer configured to generate an electric signal proportional to the velocity of the toolbar along a direction; at least one piezoelectric actuator; and a control logic unit, operatively connected to the at least one accelerometer and to the at least one piezoelectric actuator, wherein control logic unit is configured to drive the at least one piezoelectric actuator by a driving signal proportional to the velocity derived from at least one accelerometer adapted to compensate the torque and the vibrations on the toolbar.