Machine for machining spiral cutting edges on cutting tools

Claim 2

A machine for machining a spiral cutting edge on a workpiece having an elongate shank with a rounded head, comprising; a support unit comprising first and second supports mounted for sliding movement relative to one another and for joint rotation about a vertical axis; a headstock carried by the first support, the headstock having a spindle for carrying thereon and, coaxially with an axis thereof, a workpiece having a rounded head surface and a cylindrical shank surface smoothly continuing the head surface, the headstock being positionable so that in one position of the headstock, the axis of the spindle intersects the vertical axis; a device mounted on the second support for helicoidally driving the headstock spindle; a rotary machining tool; means for mounting the support unit for vertically translational and horizontally rotational movements thereof, the latter being centered about the vertical axis; and means for simultaneously effecting the vertically translational and the horizontally rotational movements to provide a helicoidal movement of the support unit relative to the machining tool; whereby the machining tool can machine a spiral cutting edge on the workpiece extending over the rounded head surface and smoothly continuing over the cylindrical shank surface of the workpiece, to produce a round-headed machined tool.

Claim 3

A machine for machining a spiral cutting edge on a workpiece having an elongate shank with a rounded head surface, comprising; a support unit comprising first and second supports mounted for sliding movement relative to one another and for joint rotation; a headstock carried by the first support, the headstock having a spindle for carrying thereon and, coaxially with an axis thereof, a workpiece having a rounded head surface and a cylindrical shank surface smoothly continuing the head surface, the headstock being positionable so that in one position of the headstock, the axis of the spindle intersects a vertical axis; a device mounted on the second support for helicoidally driving the headstock spindle; a rotary machining tool unit; means for mounting at least one of the units for vertical translational and horizontal rotational movements relative to one another and for centering the latter movement about the vertical axis; and means for simultaneously imparting to one of the units, relative to the other, the vertical translational and horizontal rotational movements to provide a helicoidal relative movement of the support unit and the machining unit tool, whereby the machining tool unit can machine a spiral cutting edge on the workpiece extending over the rounded head surface and smoothly continuing over the cylindrical shank surface to produce a round-headed machined tool.

Claim 4

A machine for machining a spiral cutting edge on a workpiece having an elongate shank with a rounded head surface, comprising; a support unit comprising first and second supports mounted for sliding movement relative to one another and for joint rotation; a headstock carried by the first support, the headstock having a spindle for carrying thereon and, coaxially with an axis thereof, a workpiece having a rounded head surface and a cylindrical shank surface smoothly continuing the head surface, the headstock being positionable so that in one position of the headstock, the axis of the spindle intersects a vertical axis; a device mounted on the second support for helicoidally driving the headstock spindle; a rotary machining tool unit; means for mounting at least one of the units for vertical translational and horizontal rotational movements relative to one another and for centering the latter movement about the vertical axis; and means for simultaneously imparting to one of the units, relative to the other, the vertical translational and horizontal rotational movements to provide a helicoidal relative movement of the support unit and the machining unit tool, whereby the machining tool unit can machine a spiral cutting edge on the workpiece extending over the rounded head surface and smoothly continuing over the cylindrical shank surface to produce a round-headed machined tool.

Claim 5

A machine according to claim 2, in which the first support is a table, and which also includes means for effecting and guiding movements of the headstock, on and parallel to the first support table, in a direction parallel to the headstock spindle and also in a direction perpendicular to the headstock spindle, to adjust the rounded head surface of the workpiece relative to the rotary machining tool unit.

Claim 6

A machine according to claim 2 in which the means for mounting has the support unit mounted on it for the vertical translational and horizontal rotational movements thereof, and a third support including a ramp extending about the vertical axis, and means for guiding the support unit along the ramp.

Claim 7

A machine according to claim 4, in which the third support comprises, a base carrying a fixed vertical shaft to define the vertical axis, and a plate extending about the vertical shaft and pivotally mounted on the base about a horizontal axis for pivotal inclining of the plate to provide the ramp and to dispose it helicoidally about the vertical shaft.

Claim 8

A machine according to claim 5, in which the ramp is a track on the plate, extending over a quarter of a circle and centered approximately about the vertical shaft when the plate is substantially horizontal; the means for guiding the support unit comprising a roller mounted on said unit and engaging the track.

Claim 9

A machine according to claim 5, comprising cam means mounted between the plate and the base for setting the inclining of the plate.