Method for making insert for rotary cutter
AssigneeGeneral Motors Corporation
InventorsDonald G. Bent, Martin F. Jarrard
Life of this patent
Estimating the term…
Abstract
A method for making a cutting insert for use in an ID rotary cutter includes obtaining the profile of a convex surface portion of a finished part to be milled with the cutter, translating the profile a minimum distance away from a reference axis for the convex surface portion, and generating a reference contour by rotating the translated profile about the reference axis. A reference profile for a cutting edge of the cutting insert is obtained as the intersection of the reference contour with a reference plane that is disposed at a predetermined helix angle relative to the reference axis.
Claims9
A method for making a cutting insert useful for milling an outer surface of a workpiece with a rotary cutter, the outer surface being characterized by a desired contour including a first surface portion having a minimum radius relative to a reference axis and a second portion having a maximum radius relative to the reference axis, the method comprising:
- selecting a first reference plane intersecting both the reference axis and the outer surface;
- obtaining a first profile of the desired contour of the outer surface as the intersection of the outer surface with the first reference plane;
- translating the first profile within the first reference plane in a direction normal to the reference axis such that the first profile is no less than a minimum distance away from the reference axis, the minimum distance being greater than the maximum radius;
- rotating the translated first profile about the reference axis to generate a reference contour;
- selecting a second reference plane disposed at a predetermined helix angle relative to the reference axis and intersecting the reference contour;
- obtaining a second profile of the reference contour as the intersection of the reference contour with the second reference plane;
- and
- forming a cutting edge of the insert based at least in part on the second profile.
A method for making a cutting insert for an ID rotary cutter, the insert being useful for milling an outer surface of a generally-cylindrical workpiece characterized by a desired contour including a first surface portion having a nominal radius relative to a reference axis, the method comprising:
- selecting a first reference plane intersecting both the reference axis and the outer surface;
- obtaining a first profile of the desired contour of the outer surface as the intersection of the outer surface with the first reference plane;
- translating the first profile within the first reference plane in a direction normal to the reference axis such that the first profile is no less than a minimum distance away from the reference axis, the minimum distance being greater than the nominal radius;
- generating a reference contour based on the translated first profile and the reference axis to generate a reference contour, the generated reference contour having a first longitudinal end and a second longitudinal end relative to the reference axis;
- selecting a second reference plane intersecting the first and second ends of the reference contour and disposed at a predetermined angle with respect to the reference axis;
- obtaining a second profile of the reference contour as the intersection of the reference contour with the second reference plane;
- and
- forming a cutting edge of the insert based at least in part on the second profile.
Dependencies are inferred from the claim text.