US 8,690,498 B2Granted

Cutting machining method and cutting machining apparatus

AssigneeYamazaki Mazak Corporation

InventorsToshiyuki Muraki, Yukihide Harada, Yuki Yamamoto

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Abstract

When machining of a circumferential groove is performed by advancing a cutting tool which is attached to a rotating shaft extending to an inner side from an outer side of a rotating work into the work in a depth direction, the rotating shaft is downwardly inclined toward the inner side of the work at a predetermined inclination angle, a trajectory of a cutting edge within the work is arranged to be an ellipse of which minor axis is oriented in the radial direction connecting a deepest point thereof and the center of the work as viewing in a plane view, and the work is cut as lowering the cutting tool until reaching groove depth of a machining target while maintaining the inclination angle, so that deviation occurring in a direction of an axis toward a work center axis in parallel to a work face from a point on the work face on which the deepest point is projected or an axis of the rotating shaft of the cutting tool projected on the work face can be arbitrarily set.

A cutting machining method for performing circumferential groove machining on a work, rotatable about a work center axis, by advancing a cutting tool, which is attached to a rotating shaft extending, relative to the work center axis, to a radially inner side of the work from a radially outer side of the work, into the work in a depth direction of the work from a face of the work, the method comprising:

determining a desired deviation δ in a direction along an x-axis between a trajectory of a cutting edge of the cutting tool within the work and an arc of a groove which is a machining target shape;
acquiring, from the following equation, an inclination angle B based on the deviation δ, for arranging the trajectory to be a part of an ellipse of which a minor axis is oriented in the radial direction of the work and extends from a deepest point of the trajectory toward the work center axis;
inclining the rotating shaft downward relative to the face of the work as the rotating shaft extends in a direction from the radially outer side toward the radially inner side at the acquired inclination angle B;
and
cutting the work as machining is performed until the cutting tool reaches a groove depth of a machining target while maintaining the inclination angle B so as to set the deviation δ for cutting depth t at an arbitrary point on the trajectory, wherein
the x-axis denotes an axis situated along the intersection of a first plane defined by the face of the work and a second plane either defined by the work center axis and the deepest point of the trajectory or defined by the work center axis and an axis about which the rotating shaft rotates,
[
Equation
⁢
⁢
9
]
δ
=
(
a
d
-
t
)
⁢
tan
⁢
⁢
B
-
D
2
+
1
2
⁢
D
2
-
4
⁢
⁢
d
⁡
(
a
d
-
t
)
cos
⁢
⁢
B
+
4
⁢
(
a
d
-
t
)
2
cos
⁢
⁢
B
2
(
9
)
wherein D denotes a diameter of the groove shape to be machined, ad and d denote respectively depth of the groove shape to be machined and a diameter of the cutting edge trajectory, and 0≦t≦ad is satisfied.

66 more elements

Abstract

Claims6