Abstract: A tapping method for performing a tapping process in a punch press includes engaging a front end of a tap provided at a tapping tool attached to a rotating mold indexing device rotatably provided at the punch press with a prepared hole formed in a workpiece. When the front end of the tap is engaged with the prepared hole, a control motor of the rotating mold indexing device is rotated positively to rotate the tap positively. When it is detected that the control motor of the rotating mold indexing device has rotated a determined number of times, positive rotation of the control motor is stopped and the motor is rotated reversely, thereby to detach the tap from the prepared hole of the workpiece.

Abstract: A tapping method includes engaging a front end of a tap with a prepared hole formed in a workpiece. The tap is provided at a tapping tool attached to a rotating mold indexing device that includes a control motor M. The rotating mold indexing device is rotatably provided at a punch press. The tapping method also includes rotating the control motor M positively to rotate the tap positively when the front end of the tap is engaged with the prepared hole. The tapping method also includes stopping positive rotation of the control motor M and rotating the motor reversely, thereby to detach the tap from the prepared hole of the workpiece, when it is detected that the control motor M has rotated a determined number of times or that a predetermined time has elapsed.

Abstract: A tapping method for performing a tapping process in a punch press includes engaging a front end of a tap provided at a tapping tool attached to a rotating mold indexing device rotatably provided at the punch press with a prepared hole formed in a workpiece. When the front end of the tap is engaged with the prepared hole, a control motor of the rotating mold indexing device is rotated positively to rotate the tap positively. When it is detected that the control motor of the rotating mold indexing device has rotated a determined number of times, positive rotation of the control motor is stopped and the motor is rotated reversely, thereby to detach the tap from the prepared hole of the workpiece.

Abstract: A tapping method includes engaging a front end of a tap with a prepared hole formed in a workpiece. The tap is provided at a tapping tool attached to a rotating mold indexing device that includes a control motor M. The rotating mold indexing device is rotatably provided at a punch press. The tapping method also includes rotating the control motor M positively to rotate the tap positively when the front end of the tap is engaged with the prepared hole. The tapping method also includes stopping positive rotation of the control motor M and rotating the motor reversely, thereby to detach the tap from the prepared hole of the workpiece, when it is detected that the control motor M has rotated a determined number of times or that a predetermined time has elapsed.

Abstract: A punch press includes a pair of disc-shaped tool holders rotatably mounted on supporting portions, one of the holders carrying a plurality of punch tools, and the other holder carrying a plurality of die tools which cooperate with the punch tools in order to punch a workpiece. A striker is attached to a vertically movable ram, wherein the striker is movable to a position into which desired punch and die tools attached to the pair of tool holders are indexed in order to change direction of the tools by rotating the pair of tool holders.

Abstract: The present invention relates to a blanking apparatus comprising a press, a ram vertically movably provided on the press, a blanking unit disposed just beneath the ram, blanking tools arranged in the blanking unit; and a striker member for working on the blanking tools. The apparatus is used in particular for blanking a sheet material from a coiled strip into a number of pieces in the form of discs, triangles, and other shapes.