US 5,868,606 AGranted

Method of manufacturing a copying cutter

AssigneeSociete Europeene de Propulsion

InventorPhilippe Roger Martin

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Abstract

The present invention relates to a copying cutter provided with a cylindrical or conical body having a spherical end, constituting the active portion of the cutter, said end including a plurality of flutes inclined at a determined angle .theta. relative to the longitudinal axis of the cutter and formed along circular arcs at a determined distance x from the midplane P of the cutter, an inside face and an outside face of each of the flutes constituting, after machining, respectively a cutting face and clearance faces of each tooth of the cutter. The clearance faces comprise a first clearance face and an additional clearance face presenting at least a first facet. The cutting face has a cutting angle .gamma. given by the following equation: ##EQU1## where R is the radius of the cutter. The present invention also relates to a method of manufacturing the cutter.

Claims8

Dependent claims

A method of manufacturing the active portion of a copying cutter having a spherical ends, the cutter having a longitudinal axis A inclined at a determined angle .theta. relative to a horizontal plane, the method comprising machining stages performed with a grinding tool on a part that is formed with the spherical head and a conical shank:

a) a flute of determined depth is milled over a determined portion of the spherical head by rotating the cutter about an axis C perpendicular to the horizontal plane passing through a center of the spherical head;
b) the cutter is rotated through a predetermined angle about the longitudinal axis A, depending on the number of teeth to be made in the cutter;
c) stages a) and b) are repeated for each tooth of the number of teeth to be made;
d) a cutting face of the flute is ground over a determined depth of an internal face thereof by rotating the cutter about the axis C, with a cutting angle .gamma. varying with a predetermined distance x that exists between a plane of the grinding tool and a midplane P of the cutter, including a center thereof;
e) the cutter is rotated through a determined angle about the longitudinal axis A, depending on the number of teeth to be made in the cutter;
f) stages d) and e) are repeated for each tooth of the number of teeth to be made;
g) a first facet of an additional clearance face is ground by rotating the cutter about the axis C;
h) the cutter is rotated through a determined angle about the longitudinal axis A depending on the number of teeth to be made;
i) stages g) and h) are repeated for each tooth of the number of teeth to be made;
j) a clearance face is ground by rotating the cutter about the axis C;
k) the cutter is rotated through a determined angle about the longitudinal axis A, depending on the number of teeth to be made;
and
l) stages j) and k) are repeated for each tooth of the number of teeth to be made.

10 more elements

A method of manufacturing an active portion of a copying cutter having a spherical end and a cylindrical or conical body, the spherical end comprising the active portion of the cutter and including a plurality of flutes, each of the plurality of flutes formed along a circular arc lying in a plane inclined at a determined angle .theta. relative to a rotational axis A defined by the body of the cutter, the plane being parallel to and spaced a determined distance x from a midplane P passing through the radial center of the spherical end, the method comprising machining stages performed with a grinding tool, the machining stage comprising:

a) milling a flute of a determined depth over a determined portion of the spherical head while rotating the cutter about an axis C perpendicular to the midplane P;
b) rotating the cutter through a predetermined angle about the rotational axis A, depending on the number of teeth to be made in the cutter;
c) repeating stages a) and b) for each tooth of the number of teeth to be made;
d) grinding a cutting face of the flute over a determined depth of an internal face of the flute while rotating the cutter about the axis C, with a cutting angle .gamma. varying with the determined distance x;
e) rotating the cutter through a determined angle about the rotational axis A, depending on the number of teeth to be made in the cutter;
f) repeating stages d) and e) for each tooth of the number of teeth to be made;
g) grinding a first facet of an additional clearance face while rotating the cutter about the axis C;
h) rotating the cutter through a determined angle about the rotational axis A depending on the number of teeth to be made;
i) repeating stages g) and h) for each tooth of the number of teeth to be made;
j) grinding a clearance face while rotating the cutter about the axis C;
k) rotating the cutter through a determined angle about the rotational axis A, depending on the number of teeth to be made;
and
l) repeating stages j) and k) for each tooth of the number of teeth to be made.

10 more elements

Dependencies are inferred from the claim text.