Cutting tool point

Details Cutting tool point Cutting tool point

2000-03-08

2001-08-07

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

C408S230000

Reexamination Certificate

active

06270298

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to the field of cutting tools and, more particularly, to a cutting tool point with a unique topography.
BACKGROUND ART
A variety of cutting tool points have been used in the past to cut materials, and a variety of drill point configurations and styles are known in the prior art. Many forces are present during a cutting tool's penetration of a work piece which affect the durability of a cutting tool. One of the most damaging forces to the cutting tool's structural integrity is frictional contact between the cutting surface and the work piece. It is known in the prior art that a coolant can be introduced into the drill hole to reduce such friction and to dissipate heat. Typically, the coolant or fluid is fed through a channel which extends the length of the cutting tool and exits at the cutting tool's point. In this way, cooling and lubricating fluid can be introduced at the cutting action regardless of the depth of the hole. As the cutting fluid is pumped in, chips and coolant are forced out of the hole while the drill is taken to depth. The coolant fluid hole can help assure that cutting fluid reaches the true depth of the hole, can keep the tool cooler at the point of cutting action, and can help assist with chip evacuation through the flutes of the drill.
However, upon information and belief, the prior art has not maximized the friction-reducing, heat-reducing, and evacuation-assisting possibilities of introduced coolant. In particular, the prior art is not believed to have provided cutting point geometries which assure that the coolant physically reaches the most important thermal targets. Hence, it would be useful to provide an improved topography for cutting tool points which would channel coolant toward the higher thermal regions of the cutting edge of the tool, would create currents which dissipate heat and reduce friction, and would compel flow channels which assist in the evacuation of work piece material.
DISCLOSURE OF THE INVENTION
With parenthetical reference to the corresponding parts, portions or surfaces of the disclosed embodiment, merely for the purposes of illustration and not by way of limitation, the present invention provides an improved cutting tool adapted to be moved relative to a work piece (
38
) and having a marginal end portion (
15
) adapted to selectively remove material from the work piece when the tool is moved relative to the work piece.
The improvement comprises a marginal end having a leading cutting lip (
16
), a trailing dam (
18
), a recessed surface (
19
) extending into the marginal end between the cutting lip and the dam, and a coolant hole (
20
) communicating with the recessed surface, such that the recessed surface forms a reservoir (
40
) for coolant (
36
).
The marginal end may also comprise a second cutting lip (
25
), a second dam (
26
), a second recessed surface (
28
) extending into the marginal end between the second cutting lip and the second dam, and a second coolant hole (
29
) communicating with the second recessed surface, such that the second recessed surface forms a reservoir for coolant.
The present invention also discloses a cutting tool adapted to be moved relative to a work piece and having a marginal end portion adapted to selectively remove material from the work piece when the tool is moved relative to the work piece, the marginal end portion having an axis of rotation (
42
) and at least one flute (
21
). The improvement comprises at least one chip-forming notch (
31
) extending from the flute into the marginal end portion and beyond the axis of rotation.
The present invention also discloses a cutting tool adapted to be moved relative to a work piece and having a marginal end portion adapted to selectively remove material from the work piece when the tool is moved relative to the work piece, the marginal end portion having an axis of rotation and a chip former (
37
), the improvement comprising a chip breaker (
32
).
The present invention also discloses a cutting tool adapted to be moved relative to a work piece and having a marginal end portion adapted to selectively remove material from the work piece when the tool is moved relative to the work piece. The improvement comprises a leading cutting lip, a trailing dam, a recessed surface extending into the marginal end between the cutting lip and the dam, a coolant hole communicating with the recessed surface, and a land (
22
) having an upper portion (
33
) and a lower portion (
34
), the upper portion having a land recess (
35
) to accommodate coolant and to provide a fluid bearing between the upper portion and the work piece.
Accordingly, the general object of the present invention is to provide a cutting tool with an improved structure which results in a more durable, longer lasting, and less maintenance intensive cutting tool which provides a more precise cut.
Another object is to provide a cutting tool with an improved topography which better dissipates heat from the cutting action.
Another object is to provide a cutting tool with an improved topography which minimalizes frictional contact between the cutting tool and the work piece.
Another object is to provide a cutting tool with an improved topography which forms a hydraulic reservoir of coolant between the surfaces of the cutting tool and the work piece.
Another object is to provide a cutting tool with an improved topography such that coolant is forced in the direction of rotation so as to cool the leading cutting lip.
Another object is to provide a cutting tool with an improved topography such that coolant is forced towards the axis of rotation so as to assist in chip-breaking and removal of work piece material.
Another object is to provide a cutting tool having an improved chip-forming notch such that work piece material more easily exits through the flutes of the tool.
Another object is to provide a cutting tool having a chip breaker for breaking the material removed from the work piece into pieces for additional ease of expulsion through the flutes of the tool and to reduce heat.
Another object is to provide a cutting tool with an improved topography and a land recess such that coolant is forced between the recessed portion of the lands and the work piece so as to provide a hydraulic fluid bearing.
Another object is to provide a cutting tool with a fluid bearing which assists in centering the cutting tool for more precise cutting.
Another object is to provide a cutting tool with a fluid bearing which reduces friction between the cutting tool and the work piece.
These and other objects and advantages will become apparent from the foregoing and ongoing written specifications, the drawings, and the appended claims.


REFERENCES:
patent: 750537 (1904-01-01), Hanson
patent: 1467491 (1923-09-01), Oliver
patent: 2322894 (1943-06-01), Stevens
patent: 2769355 (1956-11-01), Crisp
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 2966081 (1960-12-01), Kallio
patent: 4222690 (1980-09-01), Hosoi
patent: 4529341 (1985-07-01), Greene
patent: 4728231 (1988-03-01), Kunimori et al.
patent: 5011342 (1991-04-01), Hsu
patent: 5160232 (1992-11-01), Maier
patent: 5486075 (1996-01-01), Nakamura et al.
patent: 5590987 (1997-01-01), Bovzovnie
patent: 5829926 (1998-11-01), Kammermeier
patent: 6056486 (2000-05-01), Colvin
patent: 3336018 (1983-04-01), None
patent: 44304 (1987-02-01), None
patent: 102814 (1988-05-01), None
patent: 406206110 (1994-07-01), None
patent: 285710 (1994-10-01), None
patent: 1133044 (1985-01-01), None
patent: 1502228 (1989-08-01), None

Affiliated with

Also associated with

Rating

Cutting tool point does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cutting tool point, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cutting tool point will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2480293