Cutting by use of rotating axially moving tool – Means to drive tool – Including means to move tool along tool-axis
Patent
1992-01-21
1992-12-22
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Means to drive tool
Including means to move tool along tool-axis
408138, B23B 4702
Patent
active
051730154
ABSTRACT:
An in-die tapping tool having particular application to a progressive die method for threading holes in a sheet metal workpiece. The tapping includes a transmission system comprising a threaded shaft assembly and a planetary roller nut. The roller nut is adapted to move axially along the shaft assembly in response to an impact force applied to the tapping tool during the downstroke of the press. The movement of the roller nut causes the shaft assembly to rotate, which rotation is imparted to a threaded lead screw to cause the lead screw to simultaneously rotate and ride axially along a threaded wall of a hollow cylindrical body. The rotational and axial movements of the lead screw through the cylindrical body are transferred to the tap to correspondingly induce a rotation and advancement of the tap towards the workpiece having the holes to be threaded. However, the axial location of the rotatable shaft assembly relative to the workpiece remains unchanged.
REFERENCES:
patent: 2314138 (1943-03-01), Garbe et al.
patent: 2346297 (1944-04-01), Garbe
patent: 2715233 (1955-08-01), Clark
patent: 4449868 (1984-05-01), Steinsberger et al.
patent: 5016335 (1991-05-01), Becker et al.
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