Turning tool holder and cutting tool insert

Patent metadata

Field	Value
Publication number	US-9925596-B2
Application number	US-201514715447-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	May 19, 2014
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A turning tool holder includes a tool body, a cutting tool insert, and a shim. A coolant conduit system extends through the turning tool holder, a first portion of the coolant conduit system extending through the tool body and an end portion of the coolant conduit system extending through the shim. The end portion of the coolant conduit system includes a through hole extending from a first surface to an opposite second surface of the shim. The end portion has a coolant outlet opening at the second surface, the coolant outlet opening being formed by the shim alone. A jet of coolant from the coolant outlet opening may be directed towards a space expected to have a cutting zone of a workpiece. Further a cutting tool insert arranged to be used in a turning tool holder is disclosed.

First claim

The invention claimed is:

1. A turning tool holder comprising:
a tool body including a recess;
a cutting tool insert;
a shim arranged at a bottom portion of the recess;
a clamping arrangement, the cutting tool insert being releasably clamped by the clamping arrangement against the shim; and
a coolant conduit system, a first portion of the coolant conduit system extending through the tool body and an end portion of the coolant conduit system extending through the shim, a section of the first portion of the coolant conduit system adjacent to the end portion is formed by the shim and a depression in the tool body in the bottom portion of the recess, the end portion of the coolant conduit system including a through hole having a length extending from a first surface of the shim facing a bottom of the recess to an opposite second surface of the shim, and a coolant outlet opening at the second surface, the coolant outlet opening being formed by the shim alone, and wherein the shim and the coolant outlet opening are configured to direct a jet of coolant from the coolant outlet opening unobstructed by the cutting tool insert towards a space expected to comprise a cutting zone of a workpiece.

2. The turning tool holder according to claim 1 , wherein a lateral portion of the shim extends beyond a body of the cutting tool insert, and wherein the coolant outlet opening is provided at the second surface in the lateral portion.

3. The turning tool holder according to claim 1 , wherein the through hole has a uniform diameter substantially along its entire length through the shim.

4. The turning tool holder according to claim 1 , wherein the through hole includes at least one conical portion.

5. The turning tool holder according to claim 1 , wherein the first portion of the coolant conduit system includes a straight conduit portion and a coolant distribution passage in the tool body, and wherein the straight conduit portion extends from the depression to the coolant distribution passage.

6. The turning tool holder according to claim 5 , wherein the depression includes a surface extending substantially perpendicularly to the straight conduit portion.

7. The turning tool holder according to claim 5 , wherein the straight conduit portion extends at an acute angle to a plane extending along the bottom portion of the recess and the shim.

8. The turning tool holder according to claim 5 , wherein the end portion has a first diameter and the straight conduit portion has a second diameter, and wherein the second diameter is equal to or larger than the first diameter.

9. The turning tool holder according to claim 5 , wherein the coolant distribution passage forms an inlet portion of the coolant conduit system including a connection arrangement for connecting the coolant conduit system to a coolant supply system of a relevant lathe.

10. The turning tool holder according to claim 5 , wherein the coolant distribution passage extends in a different direction than the straight conduit portion.

11. The turning tool holder claim 1 , wherein the shim includes an opening for securing the shim to the tool body, and wherein the opening is separate from the through hole.

12. The turning tool holder claim 1 , wherein the cutting tool insert is an eight times indexable cutting tool insert.

13. The turning tool holder according to claim 12 , wherein the cutting tool insert includes an insert body, the insert body having two opposite parallel side surfaces and four mutually substantially identical lateral surfaces extending between the side surfaces; four separate cutting edges arranged symmetrically at each side surface, each separate cutting edge including a first cutting edge portion extending along a rim portion of a side surface and a first cutting edge portion extending along a rim portion of a lateral surface in a direction from the side surface towards an imaginary middle plane arranged between and in parallel with the side surfaces, the first cutting edge portion being interconnected with the first cutting edge portion via a corner edge portion; and, as seen in a side view along a center axis, the center axis extending perpendicularly to the side surfaces, a corner point at each of the corner edge portions, four of the corner points being symmetrically arranged at each of the side surfaces with equal diagonal distances between the corner points, a first angle between a first imaginary line extending from a first corner point to a second corner point of two adjacent corner points at one side surface and a second imaginary line extending along a tip portion of the first cutting edge portion at the first corner point is within a range of 15-25 degrees.

14. The turning tool holder according to claim 13 , wherein as seen in the side view along the center axis, a second angle of approximately 17degrees is formed between a third imaginary line extending from the center axis to one of the corner points at a first side surface of the side surfaces and a fourth imaginary line extending from the center axis to an adjacent corner point of the corner points at a second side surface of the side surfaces.

15. A cutting tool insert arranged to be used in a turning tool holder including a tool body having a recess, a shim arranged at a bottom portion of the recess, a clamping arrangement, the cutting tool insert-being releasably clamped by the clamping arrangement against the shim, and a coolant conduit system, a first portion of the coolant conduit system extending through the tool body and an end portion of the coolant conduit system extending through the shim the end portion of the coolant conduit system including a through hole having a length extending from a first surface of the shim facing a bottom of the recess to an opposite second surface of the shim and a coolant outlet opening at the second surface, the coolant outlet opening being formed by the shim alone, and wherein the shim and the coolant outlet opening are configured to direct a jet of coolant from the coolant outlet opening unobstructed by the cutting tool insert towards a space expected to comprise a cutting zone of a workpiece, wherein the cutting tool insert is an eight times indexable cutting tool insert comprising:
an insert body, the insert body including two opposite parallel side surfaces and four mutually substantially identical lateral surfaces extending between the side surfaces;
four separate cutting edges arranged symmetrically at each side surface, wherein each separate cutting edge has a first cutting edge portion extending along a rim portion of a side surface and a first cutting edge portion extending along a rim portion of a lateral surface in a direction from the side surface towards an imaginary middle plane arranged between and in parallel with the side surfaces, the first cutting edge portion being interconnected with the first cutting edge portion via a corner edge portion, wherein as seen in a side view along a center axis, the center axis extending perpendicularly to the side surfaces; and
a corner point at each of the corner edge portions, four of the corner points being symmetrically arranged at each of the side surfaces with equal diagonal distances between the corner points, and wherein a first angle between a first imaginary line extending from a first corner point to a second corner point of two adjacent corner points at one side surface and a second imaginary line extending along a tip portion of the first cutting edge portion at the first corner point is within a range of 15-25 degrees.

16. The cutting tool insert according to claim 15 , wherein seen in the

Assignees

• Sandvik Intellectual Property

Inventors

• Johansson Adam
• Gewers Gustav

Classifications

• B23B27/1622

  characterised by having a special shape · CPC title

• B23B2200/0423

  Irregular · CPC title

• B23B27/10 Primary

  Cutting tools with special provision for cooling {(drills with lubricating or cooling equipment B23B51/06; features relating to lubricating or cooling of milling cutters B23C5/28; arrangements or devices for cooling or lubricating tools or work B23Q11/10)} · CPC title

• B23B2205/12

  Seats for cutting inserts · CPC title

• B23B2200/3681

  Split inserts, i.e. comprising two or more sections roughly equal in size and having similar or dissimilar cutting geometries · CPC title