Rotating cutting tool with a heat pipe

1 . A cutting tool comprising:

an elongated body comprising a first end and an opposing second end;

a cutting edge positioned at the first end;

a bore that extends into the body from the second end with the bore comprising a constant width, the bore comprising an end wall opposing the second end;

a heat pipe positioned within the bore, the heat pipe defining an interior space of a tapered shape for a liquid within the heat pipe to move towards the cutting edge during rotation of the body;

the heat pipe comprising a closed bottom end wall spaced apart from the bore end wall, an opposing open top end at the second end, and a continuous side wall that extends along the bore between the bottom end wall and the open top end; and

the side wall having a thickness that increases from the closed bottom end wall to the open top end, as such, the width of the interior space decreases from the closed bottom end wall to the open top end.

2 . The cutting tool of claim 1 , wherein the thickness of the heat pipe and the width of the interior space have continuous tapers from the closed bottom end wall to the open top end.

3 . The cutting tool of claim 2 , further comprising a plug mounted in the open top end of the heat pipe to enclose the interior space of the heat pipe.

4 . The cutting tool of claim 3 , wherein the plug comprises an outer end that is flush with the second end of the body.

5 . The cutting tool of claim 1 , wherein the heat pipe comprises a central axis that is colinear with a longitudinal axis of the body.

6 . The cutting tool of claim 1 , wherein the heat pipe is constructed from a different material than the body.

7 . The cutting tool of claim 1 , wherein the liquid is water.

8 . The cutting tool of claim 1 , wherein the cutting tool is a drill bit.

9 . The cutting tool of claim 1 , wherein the heat pipe is secured in the bore by a friction fit.

10 . The cutting tool of claim 1 , wherein the end wall of the bore is spaced away from the first end of the body.

11 . A method of cooling, the method comprising:

providing the cutting tool of claim 1 ;

rotating the body and removing material with the cutting edge from a work piece;

heating the liquid that is positioned along an evaporator section of the heat pipe and changing the liquid into a gas;

moving the gas along the heat pipe and into a condenser section of the heat pipe with the condenser section axially spaced away from the cutting edge and located further from the cutting edge than the evaporator section;

contacting the gas against the sidewall of the heat pipe along the condenser section;

condensing the gas back into the liquid along the condenser section; and

moving the liquid towards the cutting edge due to a centrifugal force from the rotating body and the tapered shape of the heat pipe.

12 . A cutting tool comprising:

a body comprising an elongated shape with a length that extends between a cutting edge at a first end and an opposing second end;

a bore of constant width that extends into the body from the second end, the bore terminates at an end wall opposing the second end;

a heat pipe positioned within the bore, the heat pipe comprising a closed bottom end wall spaced apart from the bore end wall, an opposing open top end at the second end, and a continuous side wall that extends along the bore between the bottom end wall and the open top end; and

wherein an interior diameter of the heat pipe continuously tapers such that the interior diameter decreases in a direction going away from the closed bottom end wall towards the open top end of the heat pipe; and

wherein the tapered width causes a liquid within the heat pipe to move towards the heat pipe closed bottom end wall during rotation of the body.

13 . The cutting tool of claim 12 , wherein the heat pipe is constructed from a different material than the body.

14 . The cutting tool of claim 12 , further comprising a plug mounted in the open top end of the heat pipe to enclose the heat pipe.

15 . The cutting tool of claim 12 , wherein the side wall has a thickness that increases from the closed bottom end wall to the open top end.

16 . The cutting tool of claim 12 , wherein the heat pipe is straight with a central axis that is colinear with a longitudinal axis of the body.

17 . The cutting tool of claim 12 , wherein the heat pipe is secured by a friction fit.

18 . The cutting tool of claim 12 , wherein the end wall of the bore is spaced away from the first end of the body.

19 . The cutting tool of claim 12 , wherein the cutting tool is a drill bit.

20 . The cutting tool of claim 12 , wherein the liquid is water.