Tapping tool and method for producing a threaded bore
AssigneeAudi AG
InventorPeter Kopton
Life of this patent
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Abstract
A tapping tool for producing a threaded bore having an internal thread in a workpiece. The tapping tool has a main cutting edge on its drill tip and a thread profile trailing in a tapping direction. The method has a tapping stroke in which the tapping tool is driven into the workpiece at a tapping feed rate in the tapping direction and at a tapping speed synchronized therewith and the main cutting edge of the tool produces a core hole bore and the tool thread profile forms an internal thread on the inner wall of the core hole bore. Chips are produced in the tapping stroke, which are conveyed out of the threaded bore in a chip removal direction opposite to the tapping direction and collide with thread flanks of the internal thread facing toward the chips to be removed.
Claims10
A tapping tool for producing a threaded bore having an internal thread in a workpiece, wherein the tapping tool can be driven into the workpiece in a tapping stroke, and the tapping tool can be led out of the threaded bore in a reversing stroke, the tapping tool comprising:
- a clamping shaft and an adjoining tapping body, along the longitudinal axis of the tapping body at least one flute extends up to a frontal main cutting edge on the drill tip, on which main cutting edge a rake face delimiting the flute and a frontal free surface of the drill tip converge, wherein the flute is delimited by at least one drill web in the circumferential direction of the tool and the rake face of the flute merges into an outer circumferential rear face of the drill web while forming a secondary cutting edge, and wherein the secondary cutting edge and the frontal main cutting edge converge at a radially outer main cutting edge corner, wherein a thread profile having at least one thread profile tooth is formed on the outer circumferential rear face of the drill web, wherein the tool thread profile has at least one reversing tooth having a thread flank cutting/forming edge, by which a flank allowance can be removed and/or formed from a plurality of thread flanks, which face toward the chips to be removed in the tapping stroke, of the internal thread to be produced during the reversing stroke.
A tapping tool for producing a threaded bore having an internal thread in a workpiece, wherein the tapping tool can be driven into the workpiece in a tapping stroke, and the tapping tool can be led out of the threaded bore in a reversing stroke, wherein a groove forming step takes place between the tapping stroke and the reversing stroke, in which the tapping stroke is extended by a groove forming stroke in a tapping direction, the tapping tool comprising:
- a clamping shaft and an adjoining tapping body, and at least one flute extends along the longitudinal axis of the tapping body up to a frontal main cutting edge on the drill tip, on which main cutting edge a rake face delimiting the flute and a frontal free surface of the drill tip converge, wherein the flute is delimited by at least one drill web in the circumferential direction of the tool and the rake face of the flute merges into an outer circumferential rear face of the drill web while forming a secondary cutting edge, and wherein the secondary cutting edge and the frontal main cutting edge converge at a radially outer main cutting edge corner, wherein a thread profile having at least one thread profile tooth is formed on the outer circumferential rear face of the drill web, wherein the tool thread profile is formed having at least one circumferential groove cutting edge, by which the circumferential groove adjoining the bore internal thread is formed in the groove forming stroke.
Dependencies are inferred from the claim text.