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US 4,409,868 AGranted
Threading tool and method
AssigneeThe Valeron Corporation
InventorsDavid R. Huddle, Robert L. Coleman
Life of this patent
Estimating the term…
Abstract
A threading tool is disclosed featuring the combined utilization of a multi-toothed thread chaser insert with a single point indexable thread chaser insert. In generating a desired thread form, successive teeth of the multi-toothed chaser perform the initial cutting passes on a workpiece, while the tooth of the single tooth chaser performs the final finishing cutting operation.
Claims16
A cutting tool comprising:
- toolholder means having a first cutting element mounting pocket formed at a peripheral surface of the toolholder means at one end thereof, and a second cutting element mounting pocket axially spaced rearwardly from the first pocket;
- a multi-toothed thread chaser insert positioned in the first pocket so as to present a plurality of cutting teeth extending beyond the peripheral surface transversely to a longitudinal axis of the toolholder means;
- a single tooth thread chaser insert having a finishing cutting tooth of a width narrower than the widths of the cutting teeth of the multi-toothed thread chaser insert, the single toothed thread chaser positioned in the second pocket so as to present the single finishing cutting tooth extending beyond the peripheral surface transversely to the longitudinal axis to an extent further than any of the teeth of the multi-toothed thread chaser insert;
- and
- means for clamping the multi-toothed thread chaser insert and the single toothed thread chaser insert in their respective mounting pockets.
2 more elements
A cutting tool as set forth in claim 5 further comprising:
- substantially spherically shaped means removably disposed in a portion of each of said first and second passageways, each spherically shaped means including a passageway extending along a diameter of the spherically shaped means;
- and
- means for retaining the spherically shaped means with its diametrically extending passageway in a preselected position relative to an axis of the corresponding transversely extending passageway.
A cutting tool as set forth in claim 6 wherein the means for retaining comprises:
- a threaded bore having an axis substantially parallel to the axis of the corresponding transversely extending passageway and having a countersunk portion intersecting the radial passageway at the portion where the spherically shaped means is removably disposed;
- and
- screw means having a tapered surface positioned for retentive engagement with the spherically shaped means when the screw means is threaded into the bore.
A cutting tool as set forth in claim 8 further comprising:
- a chipbreaker mounted between a top surface of the multi-toothed chaser and the means for clamping same.
A method for generating a thread from of predetermined pitch on a workpiece comprising:
- mounting a multi-toothed thread chaser insert to a lateral surface at an end of a toolholder,
- mounting a single toothed thread chaser on the same toolholder axially spaced rearwardly with respect to the toolholder end from the teeth of the multi-toothed chaser insert a distance substantially equal to the pitch multiplied by an integer, the single tooth having a width narrower than the width of any of the teeth of the multi-toothed chaser insert and with the single tooth positioned to take a cut deeper than any of the teeth of the multi-toothed chaser;
- and
- feeding the workpiece relative to the toolholder such that the thread form is initially cut by successive teeth of the multi-toothed chaser insert and finish cut by the single-toothed chaser.
1 more element
A toolholder comprising:
- a body having a shank portion;
- a first locating and mounting means having at least two substantially perpendicular surfaces at a peripheral surface of the shank portion adjacent one end thereof, the substantially perpendicular surfaces shaped for receipt of a substantially rectangular multi-toothed thread chaser insert with teeth which will extend beyond the peripheral surface;
- and
- second locating and mounting means axially spaced along the shank rearwardly of and in substantial axial alignment with the first locating and mounting means, the second locating and mounting means including a pocket having substantially mutually perpendicular surfaces shaped for receipt of a cutting element presenting a single thread chasing finishing tooth which will extend beyond the peripheral surface to an extent further than any of the teeth of the multi-toothed insert, and a shoulder portion lying between the pocket and the first locating and mounting means and having a surface adjacent the first locating and mounting means engaging one edge of the multi-toothed insert, the width of the shoulder portion determining the distance between a last cutting tooth of the multi-toothed insert and the finishing tooth.
1 more element
Dependencies are inferred from the claim text.