Milling insert and a milling tool

Patent metadata

Field	Value
Publication number	US-10065253-B2
Application number	US-201515531144-A
Country	US
Kind code	B2
Filing date	Nov 9, 2015
Priority date	Nov 28, 2014
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A milling insert suitable for shoulder milling includes a side surface extending between an upper and lower side and a cutting edge having a primary and a secondary cutting edge portion. The side surface includes an axial support surface opposite of the secondary cutting edge portion. The lower side includes a locking groove extending longitudinally, and a lower contact region formed to bear on a fastening member. The upper side has an upper contact region arranged to bear on a top support member of a tool in which the milling insert is mountable. A milling tool is provided with a top support member for bearing on the upper contact region of the milling insert, a locking ridge for locking with the locking groove, and an axial contact surface for supporting the axial support surface. A fastening member presses the milling insert against the top support member and the locking ridge.

First claim

The invention claimed is:

1. A milling insert, comprising:
an upper side defining an upper extension plane and including a chip surface;
a lower side defining a lower extension plane parallel with the upper extension plane;
a side surface extending between the upper side and the lower side around a periphery of the milling insert and including at least one primary clearance surface and at least one secondary clearance surface;
a cutting edge including a primary cutting edge portion formed between the primary clearance surface and the chip surface, and a secondary cutting edge portion formed between the secondary clearance surface and the chip surface, wherein the upper side has a basic shape of a parallelogram with a base b defining a longitudinal direction along the primary cutting edge portion, and a height h defining a lateral direction perpendicular to the longitudinal direction, wherein a longitudinal mid-plane of the milling insert is defined, extending in the longitudinal direction perpendicularly to the upper extension plane and laterally located at half of the height h, the side surface including an axial support surface longitudinally located opposite of the secondary cutting edge portion, and at an acute angle α with respect to the longitudinal mid-plane as seen in the upper extension plane, the lower side including a locking groove extending in the longitudinal direction along the entire milling insert outside of said longitudinal mid-plane and having an outermost wall located laterally outside of the axial support surface, the lower side further having a lower contact region formed to bear on a fastening member, which lower contact region being formed laterally inside of the longitudinal mid-plane, and the upper side including an upper contact region laterally located between the longitudinal mid-plane and the lower contact region, which upper contact region being configured to bear on a top support member of a tool body in which the milling insert is mountable.

2. The milling insert according to claim 1 , wherein the lower contact region includes a recess formed with respect to the lower extension plane.

3. The milling insert according to claim 1 , wherein the upper contact region includes a flat surface extending in the longitudinal direction and laterally inclined at an angle β of 0-45° with respect to the upper extension plane.

4. The milling insert according to claim 1 , wherein the upper contact region includes a convex surface.

5. The milling insert according to claim 1 , wherein the milling insert is shaped so that the base b and the height h of said parallelogram fufill the relation h<b≤3 h.

6. The milling insert according to claim 1 , wherein the locking groove has a width w within the range 0.15 hL≤w≤0.40 hL, wherein hL is the height of the lower side as measured in the lateral direction.

7. The milling insert according to claim 1 , wherein a total angle θ measured between the outermost wall and the innermost wall of the locking groove is within the range 50°-100°.

8. The milling insert according to claim 1 , wherein the locking groove has a depth d within the range 0.3 w≤d≤0.7 w, wherein w is a width of the locking groove.

9. The milling insert according to claim 1 , wherein the milling insert is indexable with two opposite primary cutting edge portions and two opposite secondary cutting edge portions.

10. The milling insert according to claim 1 , wherein the upper side includes a chip forming surface.

11. A milling tool comprising:
a tool body including a front end and a rear end, between which a central rotation axis extends around which the tool is rotatable in a direction of rotation, at least one insert seat formed in a transition between the front end and a peripheral surface extending between the front end and the rear end of the tool body, a chip pocket and a top support member provided rotationally ahead of the at least one insert seat;
at least one milling insert securely mounted in the at least one insert seat, the milling insert including an upper side defining an upper extension plane and including a chip surface, a lower side, a side surface extending between the upper side and the lower side around a periphery of the milling insert and including at least one primary clearance surface and at least one secondary clearance surface, a cutting edge including a primary cutting edge portion formed between the primary clearance surface and the chip surface, and a secondary cutting edge portion formed between the secondary clearance surface and the chip surface, wherein the upper side has a basic shape of a parallelogram with a base defining a longitudinal direction along the primary cutting edge portion, and a height defining a lateral direction perpendicular to the longitudinal direction, wherein a longitudinal mid-plane of the milling insert is defined, extending in the longitudinal direction perpendicularly to the upper extension plane and laterally located at half of the height (h), wherein the side surface includes an axial support surface longitudinally located opposite of the secondary cutting edge portion, and at an acute angle, with respect to the longitudinal mid-plane as seen in the upper extension plane, the lower side of the milling insert including at least one first locking member being a locking ridge or a locking groove extending in the longitudinal direction along the entire milling insert outside of said longitudinal mid-plane and having an outermost wall located laterally outside of the axial support surface, the insert seat including a second locking member arranged to engage with the first locking member and a through-hole having an orifice in the insert seat provided in the tool body rotationally behind the insert seat; and
a fastening member extending through the through-hole and bearing on a lower contact region provided on the lower side of the milling insert, whereby the fastening member presses an upper contact region provided on the upper side of the milling insert against the top support member of the tool body so that the second locking member locks with the first locking member and forms a radial support for the milling insert, and also presses the axial support surface of the milling insert against an axial contact surface provided in the insert seat.

12. The milling tool according to claim 11 , wherein the lower contact region is provided laterally inside of the longitudinal mid-plane of the milling insert.

13. The milling tool according to claim 12 , wherein the upper contact region is laterally located between the longitudinal mid-plane and the lower contact region.

14. The milling tool according to claim 11 , wherein the milling tool is configured so that a contact interface between the top support member and the upper contact region of the milling insert is in the form of a line contact extending in the longitudinal direction of the milling insert.

15. The milling tool according to claim 11 , wherein the through-hole for receiving the fastening member is formed at an angle γ of 0°-20° with respect to a radial plane perpendicular to the central rotation axis of the tool body.

16. The milling tool according to claim 11 , wherein the milling tool is configured so that a contact interface between the fastening member and the lower contact region is in the form of a line contact.

17. The milling tool according to claim 11 , wherein the first locking member has an innermost wall, and wherein both the outermost wall and the innermost wall are in contact with the second locking member.

18. The milling tool acc

Assignees

• Sandvik Intellectual Property
• Sandvik Intellectual Property

Inventors

• Pettersson Sven
• Kakai Isak

Classifications

• B23C2210/168

  Seats for cutting inserts, supports for replacable cutting bits · CPC title

• B23C2200/0438

  rounded · CPC title

• B23C2210/165

  Fixation bolts · CPC title

• Y10T407/192

  with separate means to fasten tool to holder · CPC title

• B23C2200/165

  with one or more grooves · CPC title