Milling tool

Patent metadata

Field	Value
Publication number	US-10870158-B2
Application number	US-201716347001-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Nov 9, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A milling tool for face milling includes a tool body and a plurality of cutting members arranged successively along a periphery of the tool body. Each cutting member includes a main cutting edge provided for a roughing operation and a subset having a first, a second and a third secondary cutting edge provided for a finishing operation. The first and third secondary cutting edges extend in a direction perpendicular to an axial direction and the second secondary cutting edge extends between the first and third secondary cutting edge. The main cutting edges are situated at the same radial position and the first secondary cutting edges are situated at the same axial position. A first end point of the second secondary cutting edges successively progress radially inward and a second end point of the second secondary cutting edges successively progress radially inward and axially outward along the periphery of the tool body.

First claim

The invention claimed is:

1. A milling tool arranged for face milling of a work piece, said milling tool comprising:
a tool body having a central rotation axis defining an axial direction, the tool body including a periphery, the periphery including an envelope surface extending along the axial direction and a front surface extending along a radial direction; and
a plurality of cutting members arranged successively along the periphery of said tool body for radial and axial machining of said work piece, each of said plurality of cutting members including a rake face, a clearance surface, and a main cutting edge arranged for a roughing operation, wherein said main cutting edge is formed between said rake face and said clearance surface and extends along the axial direction and the envelope surface of the tool body, and wherein at least a subset of said cutting members, said subset having at least two cutting members, includes a plurality of secondary cutting edges arranged for a finishing operation, wherein said plurality of secondary cutting edges are formed between said rake face and said clearance surface along the front surface of the tool body, and wherein each of said plurality of secondary cutting edges includes at least a first secondary cutting edge, a second secondary cutting edge, and a third secondary cutting edge, wherein said first and third secondary cutting edges extend in a direction perpendicular to said axial direction and said second secondary cutting edge extends between said first and said third secondary cutting edges, the main cutting edges of the cutting members of said subset being situated at a same radial position along the envelope surface of the tool body, said first secondary cutting edges being situated at a same axial position, wherein said first secondary cutting edge is connected to said main cutting edge via a corner cutting edge, such that an axial position of said corner cutting edge determines a relative amount of material being machined by the main cutting edge and the plurality of secondary cutting edges respectively of a total depth of cut of the milling tool, and wherein a first end point of each of said second secondary cutting edges successively progresses radially inward relative to a succeeding cutting member of said subset, and a second end point of each of said second secondary cutting edges successively progresses radially inward and axially outward from the front surface along a periphery of said front surface of said tool body relative to the succeeding cutting member of said subset, such that the second secondary cutting edge of the succeeding cutting member has a greater length and is situated closer to the central rotation axis of said tool body than the second secondary cutting edge of a preceding cutting member along the periphery of said front surface of the tool body.

2. The milling tool according to claim 1 , wherein the number of cutting members including said subset equals a total number of cutting members arranged along the periphery of said tool body.

3. The milling tool according to claim 1 , wherein the corner cutting edge is a chamfer cutting edge.

4. The milling tool according to claim 1 , wherein the cutting members are arranged such that the secondary cutting edges form a radial rake angle in a range of −10° to +10°, with respect to the radial direction defined between the main cutting edge and the axis of rotation of the milling tool, and wherein the main cutting edge extends in a plane parallel to the axial direction at an axial rake angle in a range of −10° to +10° with respect to the axial direction.

5. The milling tool according to claim 1 , wherein said first end point of said second secondary cutting edges successively progress radially inward by a first radial distance between subsequent cutting members and said second end point of each said second secondary cutting edges successively progress radially inward by a second radial distance between subsequent cutting members, so that each second secondary cutting edge extends axially outwards and radially inwards by being inclined at an acute angle in relation to the central rotation axis, wherein the acute inclination angle is the same on all of the second secondary cutting edges.

6. The milling tool according to claim 5 , wherein at least one of said first radial distance and said second radial distance is in the range 0.1-0.5 mm.

7. The milling tool according to claim 1 , wherein said second end point of said second secondary cutting edges successively progress axially outwards by a fixed axial distance between subsequent cutting members.

8. The milling tool according to claim 1 , wherein the second end point of the second secondary cutting edges successively progress axially outwards by an axial distance between subsequent cutting members, and wherein the second end point of the second secondary cutting edges successively progress axially outwards by another axial distance between the subsequent cutting members, and wherein said axial distances are non-equal.

9. The milling tool according to claim 1 , wherein said main cutting edge extends in the axial direction at the periphery of the envelope surface of the tool body, such that an entering angle of the main cutting edge is 90°.

10. The milling tool according to claim 1 , wherein a cutting depth of the main cutting edge is in the range 0.1-4 mm.

11. The milling tool according to claim 1 , wherein the total cutting depth including the main cutting edge and the secondary cutting edges of the milling tool is in the range 0.2-5 mm.

12. The milling tool according to claim 1 , wherein the plurality of cutting members are formed by cutting inserts being brazed onto the tool body the main and secondary cutting edges being formed of a PCD material.

13. The milling tool according to claim 1 , wherein the diameter of the milling tool is from 12 to 100 mm.

14. The milling tool according to claim 1 , wherein the angular distance between adjacent cutting member of the milling tool is in the range 10-90°.

15. A kit of replaceable cutting inserts configured to be arranged successively along a periphery of a tool body of a milling tool for face milling, said milling tool including a tool body having a central rotation axis defining an axial direction, said periphery including an envelope surface extending along the axial direction and a front surface extending along a radial direction, each of said cutting inserts including a rake face, a clearance surface, and a main cutting edge provided for a roughing operation, wherein said main cutting edge is formed between said rake face and said clearance surface and extends along the axial direction and the envelope surface of the tool body, when arranged on the tool body, and wherein the cutting inserts of a subset of the cutting inserts includes at least two cutting inserts including a plurality of secondary cutting edges provided for a finishing operation, wherein said plurality of secondary cutting edges are formed between said rake face and said clearance surface along the front surface of the tool body, and wherein each of said plurality of secondary cutting edges includes at least a first secondary cutting edge, a second secondary cutting edge, and a third secondary cutting edge, wherein said first and third secondary cutting edges, when arranged on the tool body, extend in a direction perpendicular to said axial direction and said second secondary cutting edges extend between said first and said third secondary cutting edge, wherein, when arranged on the tool body, the main cutting edges of the cutting inserts are situated at a same

Assignees

• Sandvik Intellectual Property

Inventors

• Gasthyus Jacques
• Joly Damien
• Andre Philippe
• Lemoine Vincent

Classifications

• B23C2226/315

  polycrystalline [PCD] · CPC title

• B23C2220/605

  Roughing and finishing · CPC title

• B23C2210/285

  Cutting edges arranged at different diameters · CPC title

• B23C2200/208

  Wiper, i.e. an auxiliary cutting edge to improve surface finish · CPC title

• B23C5/18

  with permanently-fixed cutter-bits or teeth · CPC title