Reamer with front gash design

Patent metadata

Field	Value
Publication number	US-12420346-B2
Application number	US-202217702866-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Mar 24, 2022
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A reamer includes a shank portion extending from a rear end and a cutting portion extending from the shank portion to a front end. The cutting portion includes a plurality of cutting teeth separated by gashes. Each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion. The cutting portion includes a margin trailing each cutting edge and extends along each cutting edge to proximate the shank portion. Each cutting tooth also has a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth. A width, W, of each cutting tooth increases in a radially outward direction with respect to the central, longitudinal axis when viewed from the front end of the reamer.

First claim

What is claimed is:

1. A reamer, comprising:
a shank portion extending from a rear end; and
a cutting portion extending from the shank portion to a front end, the cutting portion being devoid of flutes and including a plurality of cutting teeth separated by a plurality of gashes, each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion, the cutting portion including a margin trailing each cutting edge and extending along each cutting edge to proximate the shank portion, each cutting tooth also has a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth;
a coolant bore that extends through the shank portion; and
a plurality of coolant outlet ports that are in fluid communication with the coolant bore,
wherein a coolant outlet port of the plurality of coolant outlet ports is located on the secondary relief of each cutting tooth and positioned rearward of a corresponding gash of the plurality of gashes such that fluid exiting the coolant outlet port is directed into the gash to prevent chips generated during a reaming operation from flowing in the rearward direction,
wherein a width, W, of each cutting tooth increases in a radially outward direction with respect to a central, longitudinal axis of the reamer when viewed from the front end of the reamer.

2. The reamer of claim 1 , wherein each gash extends a length, L, in the longitudinal direction from the front end of the reamer, and wherein the length, L, is in the range between about 0.5×D and about 1.0×D, where D is the cutting diameter.

3. The reamer of claim 1 , wherein a distance, d, between the secondary relief of each cutting tooth and a cutting diameter, D, of the reamer is in a range between about 1% and about 15% of the cutting diameter, D.

4. The reamer of claim 1 , wherein the secondary relief of each cutting tooth causes the cutting portion to be substantially polygonal in shape when viewed from the front end of the reamer.

5. The reamer of claim 1 , wherein the shank portion includes a first portion extending from the rear end to a second portion having a relatively smaller diameter than the first portion, and wherein the first portion is separated from the second portion by a tapered transition portion.

6. The reamer of claim 1 , wherein each gash is substantially V-shaped in cross-section and is defined by a leading side wall of a first cutting tooth, a trailing side of a second, adjacent cutting tooth, and a radiused surface therebetween, and wherein each gash defines a gash angle, GA, between the leading side wall of a first cutting tooth and a trailing side wall of a second, adjacent cutting tooth, and wherein the gash angle, GA, is in a range between about 15 degrees to about 70 degrees.

7. The reamer of claim 1 , wherein the cutting teeth are unequally indexed relative to one another.

8. The reamer of claim 1 , further comprising a coolant header in fluid communication with the coolant bore and the plurality of coolant outlet ports.

9. The reamer of claim 1 , wherein there is a one-to-one correspondence between a number of gashes and a number of coolant outlet ports.

10. The reamer of claim 1 , wherein:
each gash is defined by a leading side wall of one cutting tooth of the plurality of cutting teeth, a trailing side wall of an adjacent cutting tooth of the plurality of cutting teeth, and a radiused surface that is disposed between the leading side wall and the trailing side wall; and
the leading side wall is substantially parallel to the central, longitudinal axis.

11. A reamer, comprising:
a shank portion extending from a rear end; and
a cutting portion extending from the shank portion to a front end, the cutting portion being devoid of flutes and including a plurality of cutting teeth separated by a plurality of gashes, each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion, the cutting portion including a margin trailing each cutting edge and extending along each cutting edge to proximate the shank portion, each cutting tooth also having a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth;
a coolant bore that extends through the shank portion; and
a plurality of coolant outlet ports that are in fluid communication with the coolant bore,
wherein a coolant outlet port of the plurality of coolant outlet ports is located on the secondary relief of each cutting tooth and positioned rearward of a corresponding gash of the plurality of gashes such that fluid exiting the coolant outlet port is directed into the gash to prevent chips generated during a reaming operation from flowing in the rearward direction,
wherein each gash extends a length, L, in the longitudinal direction from the front end of the reamer, and wherein the length, L, is in the range between about 0.05×D and about 1.0×D, where D is a cutting diameter of the reamer,
wherein a distance, d, between the secondary relief of each tooth and the cutting diameter, D, of the reamer is smaller than the size of the chips generated during a reaming operation, thereby minimizing or preventing the chips from moving rearwardly of each gash,
wherein each gash is defined by a leading side wall of one cutting tooth of the plurality of cutting teeth, a trailing side wall of an adjacent cutting tooth of the plurality of cutting teeth, and a radiused surface that is disposed between the leading side wall and the trailing side wall; and
wherein the leading side wall is substantially parallel to a central, longitudinal axis of the reamer.

12. The reamer of claim 11 , wherein a width, W, of each cutting tooth increases in a radially outward direction with respect to the central, longitudinal axis when viewed from the front end of the reamer.

13. The reamer of claim 11 , wherein the secondary relief of each cutting tooth cause the cutting portion to be substantially polygonal in shape when viewed from the front end of the reamer.

14. The reamer of claim 11 , wherein the shank portion includes a first portion extending from the rear end to a second portion having a relatively smaller diameter than the first portion, and wherein the first portion is separated from the second portion by a tapered transition portion.

15. The reamer of claim 11 , wherein each gash is substantially V-shaped in cross-section and is defined by a leading side wall of a first cutting tooth, a trailing side of a second, adjacent cutting tooth, and a radius blend or root therebetween, and wherein each gash defines a gash angle, GA, between the leading side wall of a first cutting tooth and a trailing side wall of a second, adjacent cutting tooth.

16. The reamer of claim 11 , wherein the cutting teeth are unequally indexed relative to one another.

17. The reamer of claim 11 , further comprising a coolant header in fluid communication with the coolant bore and the plurality of coolant outlet ports.

18. The reamer of claim 11 , wherein there is a one-to-one correspondence between a number of gashes and a number of coolant outlet ports.

19. A reamer, comprising:
a shank portion extending from a rear end; and
a cutting portion extending from the shank portion to a front end, the cutting portion being devoid of flute

Assignees

• Kennametal Inc

Inventors

• Kauper Herbert R
• Schwaegerl Juergen
• Ning Li

Classifications

• B23D2277/30

  Chip guiding means · CPC title

• B23D2277/205

  Six · CPC title

• B23D77/006 Primary

  with means for lubricating or cooling · CPC title

• B23D77/003

  with means for preventing chatter · CPC title

• B23D77/00 Primary

  Reaming tools · CPC title