Turning toolholder with enhanced coolant delivery system

Patent metadata

Field	Value
Publication number	US-12202050-B2
Application number	US-202117564438-A
Country	US
Kind code	B2
Filing date	Dec 29, 2021
Priority date	Dec 29, 2021
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A turning toolholder includes a shank, a club head, and a clamp and a clamp screw for clamping a cutting insert. The club head includes a clamp coolant supply hole in fluid communication, a flank coolant supply hole and an auxiliary rake coolant supply hole, all in fluid communication with the main coolant supply hole. Coolant is supplied through a rake coolant exit opening formed in the forward nose portion of the clamp to direct coolant to the top rake surface of the cutting insert, and coolant is supplied through a flank coolant exit opening located below the insert-receiving pocket to provide coolant to the side flank surfaces of the cutting insert. In addition, an auxiliary rake coolant supply housing formed on a top surface of the club head supplies additional coolant to the top rake surface of the cutting insert during high heat applications.

First claim

What is claimed is:

1. A turning toolholder, comprising:
a shank having a main coolant supply hole extending therethrough;
a club head at an axially forward end of the shank, the club head having an insert-receiving pocket for receiving a cutting insert, the cutting insert having a top rake surface and one or more side flank surfaces, the club head including a clamp coolant supply hole in fluid communication with the main coolant supply hole and a flank coolant supply hole in fluid communication with the main coolant supply hole, and a flank coolant housing monolithic with the club head and having a flank coolant exit opening protruding axially outward from a front surface of the club head and located below the insert-receiving pocket;
a clamp arranged on the club head, the clamp including a forward nose portion with a downward-extending nub, the clamp including an aperture formed therethrough, the clamp including a rake coolant supply hole extending from the aperture to a rake coolant exit opening in the forward nose portion of the clamp; and
a clamp screw capable of being inserted through the aperture of the clamp and at least partially received in a clamp-securing bore of the club head to bring the clamp into pressing engagement with the cutting insert, the clamp screw having a head portion, a non-threaded portion, a threaded portion and an annular groove disposed between the non-threaded portion and the threaded portion, the annular groove capable of receiving a sealing member for sealing the clamp screw within the clamp-securing bore, the clamp screw having a central, longitudinal axis and including an internal coolant supply hole in fluid communication with both the main coolant supply hole and the clamp coolant supply hole of the club head for providing coolant to the clamp, the internal coolant supply hole having an axially-extending portion extending along the central, longitudinal axis of the clamp screw and a plurality of radially-extending portions, each radially-extending portion in fluid communication with the axially-extending portion and having a central axis that extends at an angle with respect to the central, longitudinal axis of the clamp screw,
wherein coolant is supplied from the main coolant supply hole, through the internal coolant supply hole of the clamp screw, through the rake coolant supply hole of the clamp, and exits from the rake coolant exit opening in the forward nose portion of the clamp to direct coolant to the top rake surface of the cutting insert,
wherein coolant is supplied from the main coolant supply hole, through the flank coolant supply hole, and exits the flank coolant exit opening to direct coolant to the side flank surface of the cutting insert, and
wherein the flank coolant exit opening directs coolant at an angle with respect to a central axis of an internally threaded bore formed in a bottom surface of the insert-receiving pocket of the club head.

2. The turning toolholder of claim 1 , wherein the flank coolant exit opening is V-shaped.

3. The turning toolholder of claim 1 , wherein the flank coolant supply hole continuously decreases in diameter from the main coolant supply hole to the flank coolant supply exit, thereby maintaining laminar flow and increasing a velocity of the coolant supplied to the side flank surface of the cutting insert.

4. The turning toolholder of claim 1 , wherein the club head further comprises a top surface with a rake coolant housing having an auxiliary rake coolant supply hole in fluid communication with the main coolant supply hole for directing coolant, and wherein the auxiliary rake coolant supply hole has an auxiliary rake coolant supply exit for supplying coolant to the top rake surface of the cutting insert.

5. The turning toolholder of claim 1 , wherein the aperture of the clamp includes an annular coolant trough for receiving coolant from the main coolant supply hole and for providing coolant to the rake coolant supply hole.

6. The turning toolholder of claim 1 , wherein coolant supplied from the main coolant hole to the clamp screw is received in an annular coolant channel surrounding the clamp screw.

7. The turning toolholder of claim 1 , wherein the nub is polygonal in cross-sectional shape comprising a first contact surface and a second contact surface, and wherein the first contact surface and the second contact surface of the nub are formed with a radius, R, that is approximately equal to a radius of a mounting bore of the cutting insert, thereby providing face contact between the mounting bore of the insert and the clamp when the clamp is brought into pressing engagement with the insert.

8. The turning toolholder according to claim 7 , wherein the nub is hexagonal in cross-sectional shape further comprising a front wall, a rear wall opposite the front wall, a first angled wall, and a second angled wall.

9. The turning toolholder according to claim 8 , wherein the front wall is formed at an angle with respect to a plane that is substantially parallel to a bottom surface of the nub for providing clearance for the nub when inserting the nub into the mounting bore of the insert.

10. The turning toolholder according to claim 1 , further comprising an auxiliary rake coolant supply hole formed in the club head and in fluid communication with the main coolant supply hole.

11. The turning toolholder according to claim 10 , wherein the club head further includes an auxiliary rake coolant supply housing formed on a top surface of the club head, the auxiliary rake coolant supply housing including an auxiliary rake coolant exit opening to direct additional coolant to the top rake surface of the cutting insert.

12. The turning toolholder of claim 1 , wherein the turning toolholder comprises a hybrid turning toolholder in which the club head is manufactured by additive manufacturing.

13. The turning toolholder of claim 1 , wherein the clamp is C-shape in side elevation having a tapered forward portion and tapered side portions to provide a low profile design to facilitate in chip evacuation.

14. The turning toolholder of claim 1 , wherein the flank coolant supply hole has a first flank coolant supply section extending in a first direction and a second flank coolant supply section with a central axis extending from the first flank coolant supply section in a different, second direction than the first direction.

15. The turning toolholder of claim 14 , wherein the central axis of the second flank coolant supply section is formed at an angle with respect to the central axis of the internally threaded bore formed in the bottom surface of the insert-receiving pocket of the club head.

16. The turning toolholder of claim 15 , wherein the angle with respect to the central axis of the internally threaded bore formed in the bottom surface of the insert-receiving pocket is between 1 degree and 20 degrees.

Assignees

• Kennametal Inc

Inventors

• Eichelberger Samuel
• Kaufmann Igor
• Schmid Dominik

Classifications

• B23B2250/12

  Cooling and lubrication · CPC title

• B23B2270/08

  Clamping mechanisms; Provisions for clamping (B23B2210/00 takes precedence) · CPC title

• B23B27/1666

  with plate-like cutting inserts clamped by a clamping member acting almost perpendicularly on chip-forming plane (B23B27/1677 takes precedence) · CPC title

• B23B2205/04

  Fixation screws, bolts or pins of particular form · CPC title

• B23B2260/03

  Clamps · CPC title