A tap processing method for an aluminum composite material (ACM) panel includes an inner burring operation of burring the inner skin of the ACM panel so that an inner burr formed in the inner skin extends toward the outer skin while compressing the core layer, an outer burring operation of burring the outer skin of the ACM panel so that the outer burr formed in the outer skin extends toward the inner skin while compressing the core layer and the inner burr and the outer burr are also continuously connected to each other, and a tapping operation of forming a continuous screw thread in the inner burr and the outer burr continuously connected to each other. Burring work in the inner burring operation and the outer burring operation is performed by a scrapless burring punch (SBP).

A tap processing method for an aluminum composite material (ACM) panel includes an inner burring operation of burring the inner skin of the ACM panel so that an inner burr formed in the inner skin extends toward the outer skin while compressing the core layer, an outer burring operation of burring the outer skin of the ACM panel so that the outer burr formed in the outer skin extends toward the inner skin while compressing the core layer and the inner burr and the outer burr are also continuously connected to each other, and a tapping operation of forming a continuous screw thread in the inner burr and the outer burr continuously connected to each other. Burring work in the inner burring operation and the outer burring operation is performed by a scrapless burring punch (SBP).

The tap tool (10) has an axis of rotation (Cr) and machines a pilot hole (6) so that the same becomes a screw hole (6) in a state where the axis of rotation has been matched to a central axis (C6) of the pilot hole which is provided to a workpiece, wherein the tap tool (10) is characterized by being provided with: a thread section (14) having a blade section (14a) for machining a thread groove of the screw hole; pad sections (15, 16) located behind in a direction of rotation of the blade section, and engaging with the thread groove machined by the blade section during the machining of the thread groove; and a non-engagement section (17) for forming a space (20) between said section and the screw hole in a cross-sectional view where the axis of rotation and the central axis of the screw hole have been matched. The space has a size that enables simultaneous release of the engagement between the thread section and the thread groove and the engagement of the pad sections and the thread groove, in a case where the tap tool has shifted in a direction orthogonal to the axis of rotation within the screw hole, such shift being from the state where the axis of rotation and the central axis of the screw hole have been matched.

The tap tool (10) has an axis of rotation (Cr) and machines a pilot hole (6) so that the same becomes a screw hole (6) in a state where the axis of rotation has been matched to a central axis (C6) of the pilot hole which is provided to a workpiece, wherein the tap tool (10) is characterized by being provided with: a thread section (14) having a blade section (14a) for machining a thread groove of the screw hole; pad sections (15, 16) located behind in a direction of rotation of the blade section, and engaging with the thread groove machined by the blade section during the machining of the thread groove; and a non-engagement section (17) for forming a space (20) between said section and the screw hole in a cross-sectional view where the axis of rotation and the central axis of the screw hole have been matched. The space has a size that enables simultaneous release of the engagement between the thread section and the thread groove and the engagement of the pad sections and the thread groove, in a case where the tap tool has shifted in a direction orthogonal to the axis of rotation within the screw hole, such shift being from the state where the axis of rotation and the central axis of the screw hole have been matched.

Provided are a control device and a control method for a machine tool which are capable of further reducing a command-waiting time. This control device for a machine tool which controls synchronized operation of a main shaft and a feed shaft comprises: a numerical value control unit; a main shaft control unit; a rotation detection unit. The numerical value control unit has a main shaft command output unit which, when a cutting operation and pulling-out operation are carried out from a machining start position to a target position an arbitrary number of times, acquires from the tapping program the rotation amount and the maximum rotation speed of the main shaft in the cutting operation and pulling-out operation and which supplies the rotation amount and the maximum rotation speed of the main shaft to the main shaft control unit as the main shaft command.

Provided are a control device and a control method for a machine tool which are capable of further reducing a command-waiting time. This control device for a machine tool which controls synchronized operation of a main shaft and a feed shaft comprises: a numerical value control unit; a main shaft control unit; a rotation detection unit. The numerical value control unit has a main shaft command output unit which, when a cutting operation and pulling-out operation are carried out from a machining start position to a target position an arbitrary number of times, acquires from the tapping program the rotation amount and the maximum rotation speed of the main shaft in the cutting operation and pulling-out operation and which supplies the rotation amount and the maximum rotation speed of the main shaft to the main shaft control unit as the main shaft command.