Single-Edged Milling Tool

Abstract

A single-edged milling tool has a shaft section and a machining section. A face cutting edge is formed on a distal end of the machining section. The face cutting edge extends radially from an outside end at an outer peripheral edge to an inside end close to the axis of rotation. The face cutting edge has an outer peripheral planar portion at a constant planar distance to a reference plane extending perpendicular to the axis of rotation. An oblique portion connects the planar portion to the inside end. The oblique portion of the face cutting edge is closer to the reference plane than the planar portion. The distance of the face cutting edge from the reference plane in the oblique portion diminishes continuously starting out from the planar portion to the inside end of the face cutting edge.

Claims

1.-8. (canceled)

9. A single-edged milling tool, comprising: a shaft section; a machining section; and a face cutting edge formed on a distal end of the machining section facing away from the shaft section, the face cutting edge extending radially from an outside end at an outer peripheral edge to an inside end close to an axis of rotation at a distance from the outer peripheral edge, wherein the face cutting edge has a planar portion at its outside end facing the outer peripheral edge in which the face cutting edge has a constant planar distance to a reference plane extending perpendicular to the axis of rotation in the shaft section, and an oblique portion connecting to the planar portion and extending to the inside end, in which the face cutting edge has a smaller distance to the reference plane than the planar distance.

10. The single-edged milling tool according to claim 9, wherein the planar portion of the face cutting edge has a length between 2% and 60% of the length of the face cutting edge.

11. The single-edged milling tool according to claim 9, wherein the planar portion of the face cutting edge has a length between 3% and 20% of the length of the face cutting edge.

12. The single-edged milling tool according to claim 9, wherein the distance of the face cutting edge from the reference plane in the oblique portion diminishes continuously starting out from the planar portion to the inside end of the face cutting edge.

13. The single-edged milling tool according to claim 12, wherein a reference diagonal extending in a straight line through the outside end and the inside end of the face cutting edge has an angle of between 2 and 30 relative to a perpendicular to the axis of rotation.

14. The single-edged milling tool according to claim 12, wherein a reference diagonal extending in a straight line through the outside end and the inside end of the face cutting edge has an angle of between 3 and 10 relative to a perpendicular to the axis of rotation.

15. The single-edged milling tool according to claim 12, wherein a shell surface formed by the oblique portion during rotation about the axis of rotation is conical.

16. The single-edged milling tool according to claim 15, wherein a surface line of the conical shell surface has an inclination between 2 and 30 relative to a perpendicular to the axis of rotation.

17. The single-edged milling tool according to claim 15, wherein a surface line of the conical shell surface has an inclination between 3 and 10 relative to a perpendicular to the axis of rotation.

18. The single-edged milling tool according to claim 9, wherein the face cutting edge has a chamfer on the outer peripheral edge.

19. The single-edged milling tool according to claim 9, wherein the face cutting edge follows a circumferential line of a flute extending in an axial direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various exemplary embodiments of single-edged milling tools are described by way of example below and depicted in the drawings.

[0022] FIG. 1 is a side view of a schematically depicted single-edged milling tool.

[0023] FIG. 2 is an enlarged depiction of section II in FIG. 1.

[0024] FIG. 3 is a side view of a single-edged milling tool.

[0025] FIG. 4 is another side view of the single-edged milling tool shown in FIG. 3 from a direction rotated by 90.

[0026] FIG. 5 is a plan view of an end face of the single-edged milling tool depicted in FIGS. 3 and 4.

DETAILED DESCRIPTION

[0027] The two single-edged milling tools 1 illustrated by way of example in FIGS. 1 and 2 as well as 3 to 5 have a substantially cylindrical shaft section 2, which can be inserted into a milling spindle, not shown, of a milling machine and serves to fix the single-edged milling tool 1 in the milling machine. Connecting to the shaft section 2 is a machining section 3, formed on the end-side end 4 of which, facing away from the shaft section 2, is a face cutting edge 5.

[0028] A flute 6 extends in an axial direction over the machining section 3 and joins the end 4 of the machining section 3 on the end face. Along the flute 6 there is formed in an axial direction on an outer peripheral edge 7 of the single-edged milling tool 1 a sheath cutting edge 8 extending in an axial direction. The sheath cutting edge 8 merges into the face cutting edge 5 at the outer peripheral edge 7 on the end face. The face cutting edge 5 extends from an outside end 9 on the outer peripheral edge 7 as far as an inside end 10 close to the axis of rotation, which is arranged at a distance from the outer peripheral edge 7 and is located in the vicinity of an axis of rotation 11 of the single-edged milling tool 1, about which axis the single-edged milling tool 1 rotates during the operation. The face cutting edge 5 extends through the axis of rotation 11 here.

[0029] The face cutting edge 5 has a planar portion 12 at its outside end 9 facing the outer peripheral edge 7. Inside the planar portion 12 the face cutting edge 5 has a constant planar distance 13 to a reference plane 14 extending perpendicular to the axis of rotation 11 in the shaft section 2. The face cutting edge 5 accordingly extends in the planar portion 12 in a plane that extends perpendicular to the axis of rotation 11. In a rotation of the single-edged milling tool 1 about the axis of rotation 11, the planar portion 12 passes in a plane arranged perpendicular to the axis of rotation 11 over an annular surface, the outer and inner radius of which is formed by an outer end 15 of the planar portion 12 facing the outside end 9 and by an inner end 16 of the planar portion 12 facing the inside end 10.

[0030] Connecting to the planar portion 12 is an oblique portion 17 of the face cutting edge 5 that extends as far as the inside end 10. In the oblique portion 17 the face cutting edge 5 has a smaller distance to the reference plane 14 than the planar portion 12 with its planar distance 13.

[0031] In the single-edged milling tool 1 schematically depicted in the exemplary embodiment according to FIGS. 1 and 2, the oblique portion 17 extends beyond the axis of rotation 11 as far as the inside end 10 of the face cutting edge 5 lying opposite the outer peripheral edge 7 on the other side of the axis of rotation 11. The oblique portion 17 in this implementation variant extends in a straight line in the side view depicted in FIGS. 1 and 2, at an angle 18 of about 6 between the oblique portion 17 extending in a straight line and a perpendicular to the axis of rotation 11 that extends through the planar portion 12 of the face cutting edge 5.

[0032] In the exemplary embodiment of the inventive single-edged milling tool 1 depicted in FIGS. 3 to 5, the face cutting edge 5 has a curved progression that is clearly recognizable in the side view shown in FIG. 3, which progression follows a circumferential line or the shell surface of the flute 6. Connecting to this curved progression is an end section extending substantially in a straight line, which leads through the axis of rotation 11. In this exemplary embodiment also, the course of the oblique portion 17 of the face cutting edge 5 and the respective distance of the face cutting edge 5 in the oblique portion 17 relative to the reference plane 14 in the shaft section is predefined so that in a rotation of the single-edged milling tool 1 about the axis of rotation 11, a conical shell surface is formed by the oblique portion 17. The surface line of the conical shell surface has an inclination of roughly 5 relative to a perpendicular to the axis of rotation 11.

[0033] The planar portion 12 of the face cutting edge 5 in the exemplary embodiment according to FIGS. 3 to 5 also has a curved progression adapted to the shaping of the flute 6, wherein the planar distance 13 of the face cutting edge 5 relative to the reference plane 14 is constant and the curvature of the face cutting edge 5 adapted to the shaping of the flute 6 in the planar portion 12 happens exclusively in a plane arranged perpendicular to the axis of rotation 11, which plane coincides with the image plane in FIG. 5. Connecting to the face cutting edge 5 opposite to the direction of rotation is a free surface 19 that is clearly recognizable in FIG. 4 and is formed flat and has an angle 20 of several degrees relative to the plane oriented perpendicular to the axis of rotation 11. The flute 6 joins the face cutting edge 5 with a rake angle 21.

[0034] A chamfer 22 is arranged on the outer peripheral edge 7, in order to avoid an uncontrolled breaking-off of the face cutting edge 5 at the outer peripheral edge 7 during operation.