Tool holder and tool
A tool holder for a tool for machining a workpiece. The tool holder has a cutting insert receptacle for receiving a cutting insert, wherein the cutting insert receptacle has an upper clamping jaw for abutting an upper surface of the cutting insert and a lower clamping jaw for abutting a lower surface of the cutting insert opposite the upper surface. Further, the tool holder has an internal coolant channel extending inside the tool holder between a coolant inlet opening and a coolant outlet opening, wherein an end portion of the coolant channel extending inside the upper clamping jaw along a channel center axis opens into the coolant outlet opening. The coolant outlet opening is arranged at the upper clamping jaw and configured as an elongated opening. A width of the coolant outlet opening is smaller than a height of the coolant outlet opening measured orthogonally to the width of the coolant outlet opening. The end portion of the coolant channel is also elongated in a cross-section orthogonal to the channel center axis. A width of the end portion measured orthogonal to the channel center axis is smaller than a height of the end portion measured orthogonal to the channel center axis and orthogonal to the width of the end portion.
1. A tool holder for a tool for machining a workpiece, comprising:
a cutting insert receptacle that is configured to receive a cutting insert, wherein the cutting insert receptacle comprises an upper clamping jaw that is configured to abut an upper surface of the cutting insert and a lower clamping jaw that is configured to abut a lower surface of the cutting insert opposite the upper surface; and
an internal coolant channel extending inside the tool holder between a coolant inlet opening and a coolant outlet opening, the coolant channel comprising an initial portion, a middle portion and an end portion, wherein the middle portion connects the initial portion and the end portion; wherein the end portion of the coolant channel extending inside the upper clamping jaw along a channel center axis opens into the coolant outlet opening;
wherein the coolant outlet opening is arranged at the upper clamping jaw and configured as an elongated opening, wherein a width of the coolant outlet opening is smaller than a height of the coolant outlet opening measured orthogonally to the width of the coolant outlet opening,
wherein the end portion of the coolant channel is elongated in a cross-section orthogonal to the channel center axis, wherein a first width of the end portion measured orthogonal to the channel center axis is smaller than a first height of the end portion measured orthogonal to the channel center axis and orthogonal to the first width of the end portion,
wherein the initial portion of the coolant channel has a circular cross-section having a first diameter,
wherein the first width is smaller than the first diameter, and wherein the first height is larger than the first diameter,
wherein in a first section of the middle portion, a cross-section of the middle portion continuously tapers from the first diameter to the first width, and
wherein in the first section or in a second section of the middle portion different from the first section, the cross-section of the middle portion continuously widens from the first diameter to the first height.
2. The tool holder according to claim 1 , wherein the height of the end portion increases along the channel center axis toward the coolant outlet opening.
3. The tool holder according to claim 1 , wherein the coolant outlet opening is arranged in a plane oriented at an acute angle to a holder longitudinal axis along which the tool holder extends.
4. The tool holder according to claim 1 , wherein the coolant outlet opening is oval.
5. The tool holder according to claim 4 , wherein the coolant outlet opening comprises two parallel straight flanks and two arcuate sections connected to opposite ends of the straight flanks.
6. The tool holder according to claim 1 , wherein the initial portion of the coolant channel is longer than the end portion of the coolant channel.
7. The tool holder according to claim 1 , wherein the middle portion of the coolant channel connecting the initial portion to the end portion has a circular cross-section at a first end adjacent the initial portion and an elongated cross-section at a second end adjacent the end portion, wherein the cross-section of the middle portion varies continuously between the first end and the second end.
8. The tool holder according to claim 7 , wherein the end portion is arranged inside the upper clamping jaw and the middle portion and the initial portion are arranged inside the tool holder but not inside the upper clamping jaw.
9. The tool holder according to claim 7 , wherein the initial portion has a curvature that varies continuously along a coolant channel path.
10. The tool holder according to claim 1 , wherein the tool holder comprises at least one bore, and wherein the coolant channel extends inside the tool holder around the at least one bore.
11. The tool holder according to claim 1 , wherein the coolant channel comprises a second coolant outlet opening arranged in or below the lower clamping jaw.
12. The tool holder according to claim 1 , wherein the tool holder is manufactured by additive manufacturing.
13. A tool configured for machining a workpiece, comprising:
a tool holder having a cutting insert receptacle and an internal coolant channel extending inside the tool holder between a coolant inlet opening and a coolant outlet opening, the coolant channel comprising an initial portion, a middle portion and an end portion, wherein the middle portion connects the initial portion and the end portion; and
a cutting insert arranged in the cutting insert receptacle;
wherein the cutting insert receptacle comprises an upper clamping jaw that is configured to abut an upper surface of the cutting insert and a lower clamping jaw that is configured to abut a lower surface of the cutting insert opposite the upper surface;
wherein the end portion of the coolant channel extending inside the upper clamping jaw along a channel center axis opens into the coolant outlet opening;
wherein the coolant outlet opening is arranged at the upper clamping jaw and configured as an elongated opening, wherein a width of the coolant outlet opening is smaller than a height of the coolant outlet opening measured orthogonally to the width of the coolant outlet opening,
wherein the end portion of the coolant channel is elongated in a cross-section orthogonal to the channel center axis, wherein a first width of the end portion measured orthogonal to the channel center axis is smaller than a first height of the end portion measured orthogonal to the channel center axis and orthogonal to the first width of the end portion,
wherein the initial portion of the coolant channel has a circular cross-section having a first diameter,
wherein the first width is smaller than the first diameter, and wherein the first height is larger than the first diameter,
wherein in a first section of the middle portion, a cross-section of the middle portion continuously tapers from the first diameter to the first width, and
wherein in the first section or in a second section of the middle portion different from the first section, the cross-section of the middle portion continuously widens from the first diameter to the first height.
14. The tool holder according to claim 13 , wherein the height of the end portion increases along the channel center axis toward the coolant outlet opening.
15. The tool holder according to claim 13 , wherein the coolant outlet opening is arranged in a plane oriented at an acute angle to a holder longitudinal axis along which the tool holder extends.
16. The tool holder according to claim 13 , wherein the coolant outlet opening is oval.
17. The tool holder according to claim 16 , wherein the coolant outlet opening comprises two parallel straight flanks and two arcuate sections connected to opposite ends of the straight flanks.